阅读说明：本技术 自动切换阀及热水器循环系统 (Automatic switching valve and water heater circulation system ) 是由 金晶 段裘铭 于 2021-01-07 设计创作，主要内容包括：本发明公开了一种自动切换阀及热水器循环系统。自动切换阀包括阀体部件和阀芯部件,阀体部件内具有三个腔室,三个腔室各对应一个水口。阀芯部件具有顺次设置的阀芯主体和双程记忆合金弹簧,双程记忆合金弹簧的两端分别抵接阀体部件和阀芯主体。阀芯部件被设置为：当介质温度不超过第一温度时,阀芯主体压缩双程记忆合金弹簧,第一腔室和第二腔室连通,第二腔室和第三腔室断开,当介质温度升至第二温度时,双程记忆合金弹簧推动阀芯主体,使第二腔室和第三腔室连通,第一腔室和第二腔室断开。本发明利用双程记忆合金弹簧随温度变化的性质控制水的流动方向,实现自动切换阀所在系统的回路的切换,循环回路中的水温被搅匀。(The invention discloses an automatic switching valve and a water heater circulating system. The automatic switching valve comprises a valve body part and a valve core part, wherein three chambers are arranged in the valve body part, and each chamber corresponds to one water gap. The valve core component is provided with a valve core main body and a two-way memory alloy spring which are sequentially arranged, and two ends of the two-way memory alloy spring are respectively abutted against the valve body component and the valve core main body. The spool member is configured to: when the medium temperature does not exceed the first temperature, the valve core main body compresses the two-way memory alloy spring, the first cavity is communicated with the second cavity, the second cavity is disconnected with the third cavity, when the medium temperature rises to the second temperature, the two-way memory alloy spring pushes the valve core main body to enable the second cavity to be communicated with the third cavity, and the first cavity is disconnected with the second cavity. The invention utilizes the property of the two-way memory alloy spring changing along with the temperature to control the flow direction of water, realizes the switching of the loop of the system where the automatic switching valve is positioned, and the water temperature in the circulating loop is stirred uniformly.)

1. An automatic switching valve, comprising:

the inner cavity of the valve body component is provided with a first cavity with a first water gap, a second cavity with a second water gap and a third cavity with a third water gap which are sequentially arranged in a first direction;

the valve core component is provided with a valve core main body and a two-way memory alloy spring which are sequentially arranged in the first direction, and two ends of the two-way memory alloy spring are respectively abutted against the valve body component and the valve core main body;

the spool member is configured to: when the medium temperature does not exceed the first temperature, the valve core main body compresses the two-way memory alloy spring to enable the first chamber to be communicated with the second chamber, and the second chamber is disconnected with the third chamber; when the medium temperature reaches the second temperature, the two-way memory alloy spring acts on the valve core main body to enable the second chamber to be communicated with the third chamber, and the first chamber is disconnected with the second chamber.

2. The automatic switching valve of claim 1, wherein the valve core member further comprises a hydraulic cylinder assembly secured within the valve body member, wherein an input end of the hydraulic cylinder assembly abuts the two-way memory alloy spring, and wherein an output end of the hydraulic cylinder assembly is slidably coupled to and sealingly disposed with the valve core body.

3. The automatic switching valve according to claim 2, wherein the hydraulic cylinder assembly includes a hydraulic cylinder and a valve stem, one end of the hydraulic cylinder is in dynamic sealing connection with the valve stem, the other end of the hydraulic cylinder is in dynamic sealing connection with the valve core main body, the valve core main body and the valve stem form a hydraulic cavity containing a liquid-phase medium in the hydraulic cylinder, and the two-way memory alloy spring abuts against the valve stem.

4. The automatic switching valve according to claim 3, wherein the hydraulic cylinder includes a thick pipe section and a thin pipe section which are communicated with each other, the thick pipe section and/or the thin pipe section are fixed on the valve body member, and the valve stem is sealingly provided with an inner wall surface of the thick pipe section; the valve core main body is arranged in a sealing way with the inner wall of the thin pipe section.

5. The automatic switching valve according to claim 3,

the outer wall surface of the hydraulic cylinder is provided with a plurality of clamping blocks, and the valve body part is provided with clamping grooves which are correspondingly clamped with the clamping blocks one by one;

and/or the end surface of the hydraulic cylinder is abutted against the first end of the valve body component;

and/or a plurality of grooves or holes are uniformly distributed at one end of the hydraulic cylinder close to the valve body part in the circumferential direction, and the space for containing the two-way memory alloy spring in the hydraulic cylinder is communicated with the space outside the hydraulic cylinder;

and/or the valve rod comprises a disk body, a first cavity sealing groove is arranged on the side surface of the disk body, a sealing ring for sealing the valve rod and the hydraulic cylinder is arranged in the first cavity sealing groove, and the two-way memory alloy spring is abutted against the disk body;

and/or the valve rod comprises a guide cylinder, and the two-way memory alloy spring is sleeved on the guide cylinder;

and/or the valve rod comprises a rod part, the rod part penetrates through the hydraulic cavity and is inserted into the valve core main body, and the rod part is connected with the valve core main body in a sliding mode.

6. The automatic switching valve according to claim 2, wherein the spool body includes a spool assembly and a common elastic member, both ends of the common elastic member respectively abut against the second ends of the spool assembly and the valve body member, and the spool assembly is connected with the hydraulic cylinder assembly; the valve core assembly is used for controlling the connection and disconnection of the first cavity and the second cavity and the connection and disconnection of the second cavity and the third cavity.

7. The automatic switching valve of claim 6, wherein the spool assembly comprises:

a top rod;

the first valve port assembly is fixed on the ejector rod and is in sliding connection with the output end of the hydraulic cylinder assembly, and the first valve port assembly is used for realizing connection and disconnection between the first chamber and the second chamber; and

the second valve port assembly is fixed on the ejector rod in a sealing mode and used for realizing the connection and disconnection of the second chamber and the third chamber; one end of the common elastic member abuts against the second valve port assembly.

8. The automatic switching valve of claim 7, wherein the first valve port assembly comprises a first valve port, the first valve port comprises a limiting portion and a sliding portion protruding outward from a middle portion of the limiting portion, the limiting portion is fixedly connected to one end of the top rod, the limiting portion is used for realizing connection and disconnection between the first chamber and the second chamber, and the sliding portion is slidably connected to and hermetically disposed at the output end of the hydraulic cylinder assembly.

9. The automatic switching valve according to claim 8,

the sliding part is inserted into the output end of the hydraulic cylinder, the outer wall surface of the sliding part is provided with an annular second cavity sealing groove, and a sealing ring for sealing the sliding part and the output end of the hydraulic cylinder is arranged in the second cavity sealing groove;

and/or the sliding part is a columnar body.

10. The automatic switching valve according to claim 8, wherein a first baffle and a second baffle, both annular, are formed at a local position of the limiting portion along a radial extension thereof, a first valve port sealing groove for accommodating a first valve port sealing ring is formed between the first baffle and the second baffle, the first valve port sealing ring partially protrudes from the second baffle, and sealing between the first chamber and the second chamber is achieved by contact between a portion of the first valve port sealing ring protruding from the second baffle and a wall surface of the first chamber.

11. The automatic switching valve of claim 8, wherein the limiting portion comprises a first locating hole, the first valve port assembly further comprising:

the first positioning ring is fixed in the first positioning hole, and the end part of the ejector rod is inserted in the first positioning ring; and

the first buckle is clamped on the ejector rod and is mutually abutted to the first positioning ring.

12. The automatic switching valve of claim 7, wherein the second valve port assembly comprises a second valve port, an inner ring of the second valve port being fixed to the stem and being sealingly disposed therewith; the outer ring of the second valve port is used for realizing connection and disconnection between the second chamber and the third chamber.

13. The automatic switching valve according to claim 12, wherein a third baffle and a fourth baffle, both annular, are formed at a local position of the second valve port along a radial direction of the second valve port, a second valve port sealing groove for accommodating a second valve port sealing ring is formed between the third baffle and the fourth baffle, the second valve port sealing ring partially protrudes from the third baffle, and sealing between the third chamber and the second chamber is achieved by contact between a portion of the second valve port sealing ring protruding from the third baffle and a wall surface of the third chamber.

14. The automatic switching valve of claim 12, wherein the second valve port includes a second positioning aperture, the second valve port assembly further comprising:

the second positioning ring is fixed in the second positioning hole, and the ejector rod penetrates through the second positioning ring and the second positioning hole;

the second buckle is clamped on the ejector rod and is mutually abutted with the second positioning ring; and

and the ejector rod sealing piece is fixed in the middle of the second positioning hole and used for sealing the ejector rod and the second valve port.

15. The automatic switching valve of claim 12,

a first positioning groove is formed in the second valve port, and one end of the common elastic piece is inserted into the first positioning groove;

and/or the common elastic piece is sleeved on the ejector rod;

and/or the common elastic element is a spiral spring.

16. The automatic switching valve of claim 7, wherein the valve body further comprises a spring retainer, one end of the spring retainer abuts against the second end of the valve body member, the other end of the spring retainer abuts against the common elastic member, and the plunger rod passes through the center of the spring retainer.

17. The automatic switching valve of claim 16, wherein the spring retainer comprises:

the guide pipe is sleeved on the ejector rod;

the side connecting plates are fixed on the side surfaces of the guide pipes, are uniformly distributed around the guide pipes and are provided with second positioning grooves which are spliced with the common elastic pieces; and

the curved plate corresponds to the side connecting plates one by one and is fixedly connected with the side connecting plates, and the outer surface of the curved plate is attached to the inner wall surface of the valve body component.

18. The automatic switching valve of claim 2, wherein the valve body member comprises:

the three-way joint is provided with the first water gap, the second water gap and the third water gap;

a valve body that separates the tee joint into the first chamber, the second chamber, and the third chamber; and

and the valve cover is respectively and fixedly connected with the end part of the valve body and the end part of the three-way joint, and the two-way memory alloy spring is abutted against the valve cover.

19. The automatic switching valve according to claim 18, wherein one of the valve cover and the valve body has a positioning block, the other has a positioning notch, a fixing tooth protrudes from a side surface of the positioning block, and a fixing groove corresponding to the fixing tooth is formed in a side wall of the positioning notch.

20. The automatic switching valve of claim 19,

the fixed teeth are provided with limiting surfaces and guiding surfaces, the limiting surfaces are perpendicular to the first direction, the guiding surfaces are obliquely arranged relative to the first direction, the protruding ends of the limiting surfaces and the protruding ends of the guiding surfaces are in smooth transition, and the limiting surfaces and the end surfaces of the fixed grooves are limited mutually;

and/or a plurality of fixed teeth are arranged on one side of the positioning block;

and/or one or more fixed teeth are respectively arranged on two sides of the positioning block;

and/or a plurality of groups of positioning notches and positioning blocks are uniformly distributed on the periphery of the valve cover.

21. The automatic switching valve of claim 18, wherein a snap groove for snap-fitting with a hydraulic cylinder assembly is formed between the end surface of the valve cover and the end surface of the valve body;

and/or a third positioning groove for inserting the two-way memory alloy spring is arranged on the valve cover;

and/or the valve cover comprises a threaded cylinder part with external threads and an end cover part, the middle part of the end cover part protrudes towards one side to form the threaded cylinder part, and the threaded cylinder part is detachably connected with the valve body and is in threaded connection with the three-way joint.

22. The automatic switching valve according to claim 18, wherein the valve body includes a connecting rib and four ring portions, the four ring portions are respectively a first ring portion, a second ring portion, a third ring portion and a fourth ring portion, the first ring portion, the second ring portion, the third ring portion and the fourth ring portion are sequentially arranged in the first direction, two adjacent ring portions are connected through the connecting rib, the first ring portion is detachably connected with the valve cover, the first chamber and the second chamber are disconnected when the valve core member abuts against the second ring portion, and the second chamber and the third chamber are disconnected when the valve core member abuts against the third ring portion.

23. The automatic switching valve of claim 22,

the outer wall surface of the second ring part is provided with an annular groove, and a sealing ring for sealing the second ring part and the three-way joint is arranged in the groove;

and/or the outer wall surface of the third ring part is provided with an annular groove, and a sealing ring for sealing the third ring part and the three-way joint is arranged in the groove;

and/or the valve body further comprises a fixing frame, the outer ring of the fixing frame is fixed on the connecting rib, and the inner ring of the fixing frame is provided with a fixing hole for the ejector rod to penetrate through.

24. The automatic switching valve according to any one of claims 1 to 23,

the first temperature is 25 ℃;

and/or, the second temperature is 40 ℃;

and/or the two-way memory alloy spring is made by winding Cu-Zn-AI memory alloy wires;

and/or the length of the two-way memory alloy spring at 37 ℃ is 1.2 times the length at 25 ℃.

25. A water heater circulation system, comprising:

the water outlet of the gas water heater is communicated with the user side through a first pipeline;

the water inlet of the circulating power device is communicated with one end of the first pipeline, which is connected with the user side; and

the automatic switching valve of any one of claims 1 to 24, wherein the second water port is communicated with a water outlet of the circulation power device, the first water port is communicated with a water inlet of the gas water heater, and the third water port is communicated with the first pipeline at a water outlet of the gas water heater.

26. The water heater circulation system as recited in claim 25, wherein the water heater circulation system has a plurality of clients disposed in parallel, and wherein the first pipeline has a one-to-one correspondence interface with the clients.

Technical Field

The invention relates to the technical field of valve structures and application thereof, in particular to an automatic switching valve and a water heater circulating system.

Background

The traditional water heater circulating system consists of a circulating device, a water heater and a matched pipeline, and has the function of realizing the circulating preheating of pipeline water so that hot water can be supplied to a hot water faucet once the hot water faucet is opened.

The circulating device and the hot-gas water heater are two independent devices, the circulating device is responsible for the circulation of a pipeline water path and can set and judge the circulating temperature, when the temperature at the position is detected to be lower than the set temperature, the device operates to circulate the loop water, and when the temperature is detected to be higher than the set temperature, the circulating device stops operating. The gas water heater is responsible for burning heating, and the burning heating is started when detecting that water circulation exists, so that the temperature of circulating water in a pipeline is gradually increased, and once a circulating loop is stopped, burning is stopped.

The temperature difference between the temperature of the water inlet end and the temperature of the water outlet end of the water heater inevitably exists, so that the problem exists in the closed circulation loop, the water temperature of the whole loop is increased gradually, the closer the water consumption point is to the water outlet of the water heater, the higher the temperature is, the closer the water consumption point is to the water outlet of the water heater, a user can feel that the temperature is too high at the water near point, and the farther the water consumption point is, the too low temperature is felt, and.

Disclosure of Invention

The invention aims to solve the technical problem of uneven water temperature in a circulating water path in the prior art, and provides an automatic switching valve and a water heater circulating system.

The invention solves the technical problems through the following technical scheme:

an automatic switching valve comprising:

the inner cavity of the valve body component is provided with a first cavity with a first water gap, a second cavity with a second water gap and a third cavity with a third water gap which are sequentially arranged in a first direction;

the valve core component is provided with a valve core main body and a two-way memory alloy spring which are sequentially arranged in the first direction, and two ends of the two-way memory alloy spring are respectively abutted against the valve body component and the valve core main body;

the spool member is configured to: when the medium temperature does not exceed the first temperature, the valve core main body compresses the two-way memory alloy spring to enable the first chamber to be communicated with the second chamber, and the second chamber is disconnected with the third chamber; when the medium temperature reaches the second temperature, the two-way memory alloy spring acts on the valve core main body to enable the second chamber to be communicated with the third chamber, and the first chamber is disconnected with the second chamber.

Preferably, the valve core component further comprises a hydraulic cylinder component fixed in the valve body component, an input end of the hydraulic cylinder component abuts against the two-way memory alloy spring, and an output end of the hydraulic cylinder component is in sliding connection with the valve core main body and is arranged in a sealing mode.

Preferably, the hydraulic cylinder assembly comprises a hydraulic cylinder and a valve rod, one end of the hydraulic cylinder is in dynamic sealing connection with the valve rod, the other end of the hydraulic cylinder is in dynamic sealing connection with the valve core main body, the valve core main body and the valve rod enable a hydraulic cavity containing a liquid-phase medium to be formed in the hydraulic cylinder, and the two-way memory alloy spring abuts against the valve rod.

Preferably, the hydraulic cylinder comprises a thick pipe section and a thin pipe section which are communicated, the thick pipe section and/or the thin pipe section are/is fixed on the valve body component, and the valve rod is arranged in a sealing manner with the inner wall surface of the thick pipe section; the valve core main body is arranged in a sealing way with the inner wall of the thin pipe section.

Preferably, the outer wall surface of the hydraulic cylinder is provided with a plurality of clamping blocks, and the valve body part is provided with clamping grooves which are correspondingly clamped with the clamping blocks one to one;

and/or the end of the hydraulic cylinder abuts against the first end of the valve body component;

and/or a plurality of grooves or holes are uniformly distributed at one end of the hydraulic cylinder close to the valve body part in the circumferential direction, and the space for containing the two-way memory alloy spring in the hydraulic cylinder is communicated with the space outside the hydraulic cylinder;

and/or the valve rod comprises a disk body, a first cavity sealing groove is arranged on the side surface of the disk body, a sealing ring for sealing the valve rod and the hydraulic cylinder is arranged in the first cavity sealing groove, and the two-way memory alloy spring is abutted against the disk body;

and/or the valve rod comprises a guide cylinder, and the two-way memory alloy spring is sleeved on the guide cylinder;

and/or the valve rod comprises a rod part, the rod part penetrates through the hydraulic cavity and is inserted into the valve core main body, and the rod part is connected with the valve core main body in a sliding mode.

Preferably, the valve core main body comprises a valve core assembly and a common elastic member, two ends of the common elastic member respectively abut against the second ends of the valve core assembly and the valve body component, and the valve core assembly is connected with the hydraulic cylinder assembly; the valve core assembly is used for controlling the connection and disconnection of the first cavity and the second cavity and the connection and disconnection of the second cavity and the third cavity.

Preferably, the spool assembly comprises:

a top rod;

the first valve port assembly is fixed on the ejector rod and is in sliding connection with the output end of the hydraulic cylinder assembly, and the first valve port assembly is used for realizing connection and disconnection between the first chamber and the second chamber; and

the second valve port assembly is fixed on the ejector rod in a sealing mode and used for realizing the connection and disconnection of the second chamber and the third chamber; one end of the common elastic member abuts against the second valve port assembly.

Preferably, the first valve port assembly comprises a first valve port, the first valve port comprises a limiting part and a sliding part, the sliding part protrudes outwards from the middle of the limiting part, the limiting part is fixedly connected with one end of the ejector rod, the limiting part is used for realizing connection and disconnection between the first chamber and the second chamber, and the sliding part is connected with the output end of the hydraulic cylinder assembly in a sliding manner and is arranged in a sealing manner.

Preferably, the sliding part is inserted into the output end of the hydraulic cylinder, an annular second cavity sealing groove is formed in the outer wall surface of the sliding part, and a sealing ring for sealing the sliding part and the output end of the hydraulic cylinder is arranged in the second cavity sealing groove;

and/or the sliding part is a columnar body.

Preferably, a first baffle and a second baffle which are annular are formed by extending the local position of the limiting part along the radial direction of the limiting part, a first valve port sealing groove used for accommodating a first valve port sealing ring is formed between the first baffle and the second baffle, the first valve port sealing ring partially protrudes out of the second baffle, and the part of the first valve port sealing ring protruding out of the second baffle is in contact with the wall surface of the first chamber to realize sealing between the first chamber and the second chamber.

Preferably, the stopper portion includes a first positioning hole, and the first valve port assembly further includes:

the first positioning ring is fixed in the first positioning hole, and the end part of the ejector rod is inserted in the first positioning ring; and

the first buckle is clamped on the ejector rod and is mutually abutted to the first positioning ring.

Preferably, the second valve port assembly comprises a second valve port, and an inner ring of the second valve port is fixed on the ejector rod and is arranged in a sealing manner with the ejector rod; the outer ring of the second valve port is used for realizing connection and disconnection between the second chamber and the third chamber.

Preferably, a third baffle and a fourth baffle which are annular are formed by extending the local position of the second valve port along the radial direction of the second valve port, a second valve port sealing groove used for accommodating a second valve port sealing ring is formed between the third baffle and the fourth baffle, the second valve port sealing ring partially protrudes out of the third baffle, and the part of the second valve port sealing ring protruding out of the third baffle is in contact with the wall surface of the third chamber to realize sealing between the third chamber and the second chamber.

Preferably, the second valve port includes a second positioning aperture, the second valve port assembly further comprising:

the second positioning ring is fixed in the second positioning hole, and the ejector rod penetrates through the second positioning ring and the second positioning hole;

the second buckle is clamped on the ejector rod and is mutually abutted with the second positioning ring; and

and the ejector rod sealing piece is fixed in the middle of the second positioning hole and used for sealing the ejector rod and the second valve port.

Preferably, a first positioning groove is formed in the second valve port, and one end of the common elastic piece is inserted into the first positioning groove;

and/or the common elastic piece is sleeved on the ejector rod;

and/or the common elastic element is a spiral spring.

Preferably, the valve core main body further comprises a spring limiting piece, one end of the spring limiting piece is abutted against the second end of the valve body component, the other end of the spring limiting piece is abutted against the common elastic piece, and the ejector rod penetrates through the center of the spring limiting piece.

Preferably, the spring stopper includes:

the guide pipe is sleeved on the ejector rod;

the side connecting plates are fixed on the side surfaces of the guide pipes, are uniformly distributed around the guide pipes and are provided with second positioning grooves which are spliced with the common elastic pieces; and

the curved plate corresponds to the side connecting plates one by one and is fixedly connected with the side connecting plates, and the outer surface of the curved plate is attached to the inner wall surface of the valve body component.

Preferably, the valve body member includes:

the three-way joint is provided with the first water gap, the second water gap and the third water gap;

a valve body that separates the tee joint into the first chamber, the second chamber, and the third chamber; and

and the valve cover is respectively and fixedly connected with the end part of the valve body and the end part of the three-way joint, and the two-way memory alloy spring is abutted against the valve cover.

Preferably, one of the valve cover and the valve body is provided with a positioning block, the other valve cover is provided with a positioning notch, a fixed tooth protrudes from the side surface of the positioning block, and a fixing groove clamped with the fixed tooth correspondingly is formed in the side wall of the positioning notch.

Preferably, the fixed teeth are provided with a limiting surface and a guide surface, the limiting surface is perpendicular to the first direction, the guide surface is obliquely arranged relative to the first direction, the protruding end of the limiting surface is in smooth transition with the protruding end of the guide surface, and the limiting surface and the end surface of the fixed groove are mutually limited;

and/or a plurality of fixed teeth are arranged on one side of the positioning block;

and/or one or more fixed teeth are respectively arranged on two sides of the positioning block;

and/or a plurality of groups of positioning notches and positioning blocks are uniformly distributed on the periphery of the valve cover.

Preferably, a clamping groove used for clamping the hydraulic cylinder assembly is formed between the end surface of the valve cover and the end surface of the valve body;

and/or a third positioning groove for inserting the two-way memory alloy spring is arranged on the valve cover;

and/or the valve cover comprises a threaded cylinder part with external threads and an end cover part, the middle part of the end cover part protrudes towards one side to form the threaded cylinder part, and the threaded cylinder part is detachably connected with the valve body and is in threaded connection with the three-way joint.

Preferably, the valve body includes splice bar and four rings portion, and these four rings portion are first ring portion, second ring portion, third ring portion and fourth ring portion that set up in order in the first direction respectively, connect through a plurality of splice bars between two adjacent ring portions, first ring portion can be dismantled with the valve gap and be connected, and the valve core part butt during second ring portion, first cavity and second cavity disconnection, the valve core part butt during third ring portion, second cavity and third cavity disconnection.

Preferably, the outer wall surface of the second ring part is provided with an annular groove, and a sealing ring for sealing the second ring part and the three-way joint is arranged in the groove;

and/or the outer wall surface of the third ring part is provided with an annular groove, and a sealing ring for sealing the third ring part and the three-way joint is arranged in the groove;

and/or the valve body further comprises a fixing frame, the outer ring of the fixing frame is fixed on the connecting rib, and the inner ring of the fixing frame is provided with a fixing hole for the ejector rod to penetrate through.

Preferably, the first temperature is 25 ℃;

and/or, the second temperature is 40 ℃;

and/or the two-way memory alloy spring is made by winding Cu-Zn-AI memory alloy wires;

and/or the length of the two-way memory alloy spring at 37 ℃ is 1.2 times the length at 25 ℃.

A water heater circulation system comprising:

the water outlet of the gas water heater is communicated with the user side through a first pipeline;

the water inlet of the circulating power device is communicated with one end of the first pipeline, which is connected with the user side; and

the automatic switching valve as described in any of the above, the second water gap communicates with the water outlet of the circulation power device, the first water gap communicates with the water inlet of the gas water heater, and the third water gap communicates with the first pipeline at the water outlet of the gas water heater.

Preferably, the water heater circulation system has a plurality of user terminals arranged in parallel, and the first pipeline has interfaces corresponding to the user terminals one to one.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows:

in the invention, the flow direction of water is controlled by using the property of the two-way memory alloy spring changing along with the temperature, so that the switching of a loop of a system where the automatic switching valve is located is realized. The automatic switching valve is applied to the circulating system of the water heater, so that the effect of water temperature balance in the circulating loop is realized.

Drawings

Fig. 1 is a sectional view of an automatic switching valve according to an embodiment of the present invention, in which a first chamber and a second chamber are communicated and the second chamber and a third chamber are disconnected;

FIG. 2 is a cross-sectional view of an automatic switching valve according to an embodiment of the present invention, wherein the first chamber and the second chamber are disconnected and the second chamber and the third chamber are connected;

FIG. 3 is a cross-sectional view of a valve core member according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a hydraulic cylinder assembly according to an embodiment of the present invention;

FIG. 5 is a schematic view of the operation of a hydraulic cylinder according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a hydraulic cylinder assembly according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a valve core member according to an embodiment of the present invention;

FIG. 8 is a schematic structural view of a valve body component according to an embodiment of the present invention, wherein the tee structure is partially cut away;

FIG. 9 is a schematic structural view of a valve body and a bonnet according to an embodiment of the invention;

FIG. 10 is a schematic structural view of a valve body according to an embodiment of the present invention;

FIG. 11 is a schematic view of a water heater circulation system in accordance with an embodiment of the present invention.

Description of reference numerals:

automatic switching valve 100

Valve core component 1

Valve core main body 11

First valve port assembly 111

First valve port 1111

Sliding part 1112

Stopper 1113

Second cavity seal groove 1114

First baffle 1115

Second baffle 1116

First valve port seal groove 1117

First valve port sealing ring 1118

First positioning hole 1119

First retainer ring 11110

First buckle 11111

Second valve port assembly 112

Second valve port 1121

Third baffle 1122

Fourth baffle 1123

Second valve port seal 1124

Second valve port seal groove 1125

Second positioning hole 1126

Second retaining ring 1127

Second buckle 1128

First positioning groove 1129

Top rod 113

Spring retainer 114

Guide tube 1141

Side connection plate 1142

Curved plate 1143

Two-way memory alloy spring 12

Hydraulic cylinder assembly 13

Hydraulic cylinder 131

Thick pipe section 1311

Thin pipe segment 1312

Card connecting block 1313

Valve stem 132

Dish 1321

First cavity seal slot 1322

Guide cylinder 1323

Stem 1324

Hydraulic chamber 133

Common elastic member 14

Valve body component 2

Three-way joint 21

First chamber 211

Second chamber 212

Third chamber 213

First nozzle 214

Second nozzle 215

Third nozzle 216

Valve body 22

Positioning notch 221

Fixing groove 222

The first ring part 223

Second ring portion 224

Third ring part 225

The fourth ring part 226

Connecting rib 227

Fixed mount 228

Tube 229

Rib 2210

Valve cover 23

Positioning block 231

Fixed teeth 232

Limit surface 2311

Guide surface 2312

Screw barrel 233

End cap portion 234

Third positioning groove 235

Clamping groove 24

Gas water heater 3

User terminal 4

Circulating power device 5

First pipeline 6

Cold water passage 7

Circulation loop 8

Cold water source 9

Detailed Description

The present invention is further illustrated by the following examples, but is not limited thereby in the scope of the examples described below.

Please refer to fig. 1-10 for understanding. The embodiment of the invention provides an automatic switching valve 100, which is used for automatically switching a medium flow path according to a medium temperature to realize switching of a loop of a system where the automatic switching valve 100 is located. In this example, water is used as a medium.

The automatic switching valve 100 includes a valve body member 2 and a valve core member 1, an inner cavity of the valve body member 2 has a first chamber 211, a second chamber 212, and a third chamber 213 that are sequentially arranged in a first direction, the first chamber 211 is provided with a first water port 214, the second chamber 212 is provided with a second water port 215, and the third chamber 213 is provided with a third water port 216. The first direction may be understood as a direction parallel to the axis of the valve body part 2 and/or the spool part 1.

The valve core component 1 is provided with a valve core main body 11 and a two-way memory alloy spring 12 which are sequentially arranged in the first direction, two ends of the two-way memory alloy spring 12 are respectively abutted against the valve body component 2 and the valve core main body 11, and the two-way memory alloy spring 12 extends or contracts along with the change of medium temperature. The spool member 1 is provided with: as shown in fig. 1, when the medium temperature does not exceed the first temperature, the spool body 11 compresses the two-way memory alloy spring 12, so that the first chamber 211 and the second chamber 212 are communicated, the spool body 11 blocks the passage between the second chamber 212 and the third chamber 213, and the second chamber 212 and the third chamber 213 are sealed; when the temperature of the medium rises to the second temperature, as shown in fig. 2, the two-way memory alloy spring 12 pushes the valve core main body 11 to communicate the second chamber 212 and the third chamber 213, and the valve core main body 11 blocks the passage between the first chamber 211 and the second chamber 212, and the first chamber 211 and the second chamber 212 are sealed.

Wherein, there is elastic force between the valve core main body 11 end far away from the two-way memory alloy spring 12 and the valve body part 2, so that when the water temperature does not exceed the first temperature, the valve core main body 11 has compression action on the two-way memory alloy spring 12, and the compression action simultaneously makes the valve core main body 11 contact with the valve body part 2 at the third chamber 213, thereby realizing the state shown in fig. 1. When the two-way memory alloy spring 12 expands with an increase in the temperature of the medium, there is a tendency to push the spool main body 11 to move in the left direction shown in fig. 1, and when the state shown in fig. 2 is reached, the spool main body 11 comes into contact with the valve body member 2, so that the first chamber 211 and the second chamber 212 are sealed.

The temperature of the water can be transmitted to the two-way memory alloy spring 12 through the valve core component 1, and when the first chamber 211 and the second chamber 212 are in a communication state, a small amount of water can be made to flow to the two-way memory alloy spring 12 through a gap between the valve core component 1 and the valve body component 2, so that the two-way memory alloy spring 12 is deformed.

The first temperature is normal temperature, for example, 25 ℃. The second temperature is a value higher than the first temperature, and is lower than a set temperature of a system in which the automatic switching valve 100 is located, and the second temperature may be 40 ℃. The two-way memory alloy spring 12 can be made by winding Cu-Zn-AI memory alloy wires. The two-way memory alloy spring 12 may be configured as: the standard state is normal at normal temperature of 25 ℃, and the length of the glass fiber at 37 ℃ is about 1.2 times of the length of the glass fiber at 25 ℃.

In addition, the flow direction of water is illustrated in fig. 1 and 2 by a curve including an arrow, and the line does not represent a solid member.

In operation, the second water port 215 may be used as a water inlet, and the first water port 214 and the third water port 216 may be used as water outlets, and accordingly, the first water port 214 corresponds to cold water (or normal temperature water) for communicating with a cold water passage in a system in which the automatic switching valve 100 is located, and the second water port 215 corresponds to hot water for communicating with a circulation loop in the system in which the automatic switching valve 100 is located.

According to the invention, the two-way memory alloy spring 12 is arranged at one end of the valve body component 2, and the flowing direction of water is controlled by utilizing the property of the two-way memory alloy spring 12 along with the change of temperature, so that the switching of a loop of a system where the automatic switching valve 100 is located is realized.

In the embodiment of the invention, the valve core component 1 further comprises a hydraulic cylinder assembly 13 fixed in the valve body component 2, the input end of the hydraulic cylinder assembly 13 is abutted against the two-way memory alloy spring 12, and the output end of the hydraulic cylinder assembly 13 is slidably connected with the valve core main body 11 and is arranged in a sealing manner. In other words, the two-way memory alloy spring 12 serves as a power source of the hydraulic cylinder assembly 13, and the output end of the hydraulic cylinder assembly 13 can push the valve core body 11 to move in the first direction, so that the automatic control of the water flow direction is realized. Indeed, as an alternative, in other embodiments, the two-way memory alloy spring 12 may interact directly with the valve spool body 11, or may interact with the valve spool body 11 by replacing the hydraulic cylinder assembly 13 with another actuator.

In the embodiment of the present invention, the hydraulic cylinder assembly 13 includes a hydraulic cylinder 131 and a valve rod 132, one end of the hydraulic cylinder 131 is connected with the valve rod 132 in a dynamic sealing manner, and the hydraulic cylinder 131 is connected with the valve rod 132 in a sliding manner; the other end of the hydraulic cylinder 131 is in dynamic sealing connection with the valve core main body 11, and the hydraulic cylinder 131 is in sliding connection with the valve core main body 11; the spool body 11 and the stem 132 form a hydraulic chamber 133 in the cylinder 131, which contains a liquid-phase medium, which may be water. When the valve rod 132 is compressed by the two-way memory alloy spring 12, the valve rod 132 pushes the liquid medium to move towards the side of the valve core main body 11, so that the valve core main body 11 is pushed to move; when the two-way memory alloy spring 12 contracts along with the reduction of the temperature, the valve core main body 11 pushes the liquid phase medium to move reversely, thereby realizing the switching of the circuit of the system in which the automatic switching valve 100 is positioned.

In the embodiment of the invention, the hydraulic cylinder 131 comprises a thick pipe section 1311 and a thin pipe section 1312 which are communicated, the thick pipe section 1311 and/or the thin pipe section 1312 is/are fixed on the valve body component 2, and the valve rod 132 is arranged on the inner wall surface of the thick pipe section 1311 in a sealing manner; the valve body 11 is sealed to the inner wall of the narrow tube section 1312. The input end of the hydraulic cylinder 131 is on the thick pipe section 1311 and the output end of the hydraulic cylinder 131 is on the thin pipe section 1312. In the state shown in fig. 1, the liquid-phase medium is located in the thick pipe section 1311, and when the two-way memory alloy spring 12 pushes the valve rod 132 to move, the liquid-phase medium flows into the thin pipe section 1312, so that the hydraulic cylinder assembly 13 forms a hydraulic distance increaser, in other words, as will be understood in conjunction with fig. 5, since the volume of the liquid-phase medium is not compressed, when the two-way memory alloy spring 12 moves for a length of Δ L, the actual moving distance d of the spool body 11, then d > Δ L, thereby achieving the previous movement, d ≈ 3 Δ L is preferred in this embodiment, so as to better increase the deformation amount of the two-way memory alloy spring 12, compensate for the defect of insufficient deformation amount, so that the spool body 11 can completely contact with the valve body component 2, and thus the first chamber 211 and the second chamber 212 obtain better sealing effect.

In the embodiment of the invention, the outer wall surface of the hydraulic cylinder 131 is provided with a plurality of clamping blocks 1313, and the valve body part 2 is provided with clamping grooves 24 which are clamped with the clamping blocks 1313 in a one-to-one correspondence manner; the clamping blocks 1313 can be uniformly distributed along the circumference of the hydraulic cylinder 131, and correspondingly, the clamping grooves 24 are uniformly distributed. The hydraulic cylinder 131 is clamped to the valve body member 2 by a clamping block 1313.

In the embodiment of the present invention, the end of the hydraulic cylinder 131 abuts against the first end of the valve body member 2, that is, the end surface of the thick pipe 1311 abuts against the valve body member 2, so as to share the acting force borne by the clamping block 1313, thereby improving the reliability of the hydraulic cylinder 131.

In the embodiment of the present invention, the end of the hydraulic cylinder 131 close to the valve body 2 is provided with a groove or a hole at an interval, which is used to communicate the space inside the hydraulic cylinder 131, in which the two-way memory alloy spring 12 is disposed, with the space outside the hydraulic cylinder 131, so that when the first chamber 211 is communicated with the second chamber 212, a small amount of hot water can enter the two-way memory alloy spring 12, which is beneficial to the two-way memory alloy spring 12 to sense the water temperature more quickly and accurately, thereby improving the sensitivity of the automatic switching valve 100.

In the embodiment of the present invention, the valve rod 132 includes a disk 1321, a first cavity sealing groove 1322 is disposed on a side surface of the disk 1321, and a sealing ring for sealing a pipe section of the valve rod 132 and the hydraulic cylinder 131 is disposed in the first cavity sealing groove 1322, which can be implemented by the prior art, the two-way memory alloy spring 12 abuts against the disk 1321, preferably, the two-way memory alloy spring 12 abuts against an edge of the disk 1321, and at this time, the two-way memory alloy spring 12 can move along an inner wall surface of the thick pipe 1311, that is, the thick pipe 1311 has a guiding function on the two-way memory alloy spring 12, so that a direction of an elastic force of the two-way memory alloy spring 12 is relatively stable.

In the embodiment of the present invention, the valve rod 132 further includes a guiding cylinder 1323, the two-way memory alloy spring 12 is sleeved on the guiding cylinder 1323, and the two-way memory alloy spring 12 can be attached to the outer wall surface of the guiding cylinder 1323 to extend. Specifically, the guide cylinder 1323 is fixed to the disc 1321, and the two-way memory alloy spring 12 is located in a space between the guide cylinder 1323 and the thick pipe section 1311, thereby further improving the stability thereof.

In the embodiment of the present invention, the valve rod 132 further includes a rod portion 1324, the rod portion 1324 penetrates through the hydraulic chamber 133 and is inserted into the valve core main body 11, and the rod portion 1324 is slidably connected to the valve core main body 11, so that the rod portion 1324 and the valve core main body 11 can be guided to each other when they generate relative movement, thereby ensuring that the two directions of operation are consistent, and further improving the stability and reliability of the automatic switching valve 100.

In the embodiment of the present invention, the valve core main body 11 includes the common elastic member 14 and the valve core assembly, and the common elastic member 14 is interpreted as an elastic member that does not expand and contract with a change in temperature. The two ends of the common elastic part 14 are respectively abutted against the second ends of the valve core assembly and the valve body component 2, the elastic force of the common elastic part 14 is in a compressed state all the time in the first direction, and therefore the acting force towards the two-way memory alloy spring 12 is provided for the valve core assembly all the time.

The valve core assembly comprises a push rod 113, a first valve port assembly 111 and a second valve port assembly 112. The first valve port assembly 111 is fixed on the push rod 113 and is connected with the output end of the hydraulic cylinder assembly 13 in a sliding and sealing manner, and the first valve port assembly 111 is used for realizing connection and disconnection between the first chamber 211 and the second chamber 212. The second valve port assembly 112 is hermetically fixed on the mandril 113, and the second valve port assembly 112 is used for realizing the connection and disconnection of the second chamber 212 and the first chamber 211; both ends of the common elastic member 14 abut against the second port assembly 112 and the second end of the valve body member 2, respectively.

The first valve port assembly 111 includes a first valve port 1111, the first valve port 1111 includes a sliding portion 1112 and a limiting portion 1113, a middle portion of the limiting portion 1113 protrudes outward to form the sliding portion 1112, the sliding portion 1112 is slidably connected with an output end of the hydraulic cylinder assembly 13 and is disposed in a sealing manner, the limiting portion 1113 is fixedly connected with one end of the top rod 113, and the limiting portion 1113 is used for realizing connection and disconnection between the first chamber 211 and the second chamber 212.

Specifically, the sliding part 1112 is inserted into the output end of the hydraulic cylinder 131, that is, inserted into the narrow tube segment 1312, an annular second cavity seal groove 1114 is disposed on the outer wall surface of the sliding part 1112, and a seal ring for sealing the sliding part 1112 and the output end of the hydraulic cylinder 131 is disposed in the second cavity seal groove 1114; the sliding portion 1112 may be a cylindrical body; the sliding part 1112 is provided with a hole which is guided by the rod part 1324 of the valve rod 132, so that the movement directions of the valve rod 132 and the valve core main body 11 are consistent, and the control precision and the reliability of automatic switching are improved.

The stopper 1113 may have a substantially columnar or disk-like structure. The first baffle 1115 and the second baffle 1116 are both annular and extend along the radial direction of the limiting portion 1113, a first valve port sealing groove 1117 for accommodating the first valve port sealing ring 1118 is formed between the first baffle 1115 and the second baffle 1116, the first valve port sealing ring 1118 partially protrudes from the second baffle 1116, so that the first valve port sealing ring 1118 contacts the wall surface of the first chamber 211, and the first baffle 1115 completely blocks the first valve port sealing ring 1118 in the radial direction, so that the first valve port sealing ring 1118 is completely blocked when deformed, and the first valve port sealing ring 1118 is prevented from falling off to cause sealing failure. Sealing between the first chamber 211 and the second chamber 212 is achieved by the contact of the first port sealing ring 1118 with the wall surface of the first chamber 211, as shown in fig. 2, the two-way memory alloy metal spring is stretched and pushes the valve core body 11 to move to the edge of the first chamber 211, and the portion of the first port sealing ring 1118 protruding the second baffle 1116 comes into contact with the valve body member 2 to form a sealing relationship, thereby achieving sealing between the first chamber 211 and the second chamber 212.

The limiting portion 1113 includes a first positioning hole 1119, and the first positioning hole 1119 may be: the middle part of the limiting part 1113 extends outwards along the axial direction thereof to form an annular structure, and the annular structure forms a first positioning hole 1119; the following steps can be also included: the end surface of the stopper portion 1113 is recessed in its axial direction to form a first positioning hole 1119. The first positioning hole 1119 may include a hole section with a smaller diameter and a hole section with a relatively larger diameter, the hole section with the smaller diameter may be located in the middle of the limiting portion 1113, the aperture of the hole section may be the same as the diameter of the shaft of the push rod 113, and one end of the push rod 113 is inserted into the hole section with the smaller diameter, so as to improve the reliability of the valve core main body 11.

The first valve port assembly 111 further includes a first retainer ring 11110, a first snap 11111; the first positioning ring 11110 is fixed in the first positioning hole 1119 and can be fixed in a hole section with a larger diameter, the end part of the ejector rod 113 is inserted in the first positioning ring 11110, and the two can be attached; the first buckle 11111 is clamped to the top rod 113 and is abutted against the first positioning ring 11110.

The second valve port assembly 112 includes a second valve port 1121, and an inner ring of the second valve port 1121 is fixed to the top rod 113 and is arranged in a sealing manner with the top rod; the outer race of the second valve port 1121 is used to open and close the second chamber 212 and the third chamber 213. The second valve 1121 may be disposed within the third chamber 213, and the second chamber 212 and the third chamber 213 may be disconnected when an outer race of the second valve 1121 engages a wall surface of the third chamber 213.

A third baffle 1122 and a fourth baffle 1123 which are annular are formed by extending the local position of the second valve port 1121 outwards along the radial direction, a second valve port sealing groove 1125 for accommodating a second valve port sealing ring 1124 is formed between the third baffle 1122 and the fourth baffle 1123, and the second valve port sealing ring 1124 partially protrudes from the third baffle 1122 so as to be in contact with the wall surface of the third chamber 213 more effectively; the fourth stop 1123 completely stops the second port seal 1124 on the neck finish, thereby completely stopping the second port seal 1124 when the second port seal 1124 is compressed against the third chamber 213, preventing it from falling out and causing a seal failure. Sealing between third chamber 213 and second chamber 212 is achieved by the contact of second port seal 1124 with the wall of third chamber 213.

The second valve port 1121 includes a second positioning hole 1126, and the second positioning hole 1126 is a through hole having three hole sections with different diameters. Second valve port assembly 112 further comprises a second retaining ring 1127 and a second snap 1128; the second positioning ring 1127 is fixed in the second positioning hole 1126, the top rod 113 penetrates through the second positioning ring 1127 and the second positioning hole 1126, and the second buckle 1128 is clamped on the top rod 113 and abuts against the second positioning ring 1127, so that the second valve port 1121 is fixed. The second valve port assembly 112 further comprises a top rod 113 sealing member, and the top rod 113 sealing member is fixed in the middle of the second positioning hole 1126 and is used for sealing the top rod 113 and the second valve port 1121; the diameters of the three hole sections of the second positioning hole 1126 are sequentially increased, and the push rod 113 sealing element is arranged in the middle hole section to prevent the push rod from bearing axial acting force, so that the reliability of the push rod is improved.

The second valve port 1121 is provided with a first positioning groove 1129, the first positioning groove 1129 faces the common elastic member 14, and one end of the common elastic member 14 is inserted into the first positioning groove 1129, so that the stability and reliability of the common elastic member 14 are improved. The common elastic member 14 may be a coil spring, and is sleeved on the top rod 113.

The valve core main body 11 further comprises a spring limiting member 114, one end of the spring limiting member 114 abuts against the second end of the valve body component 2, the other end of the spring limiting member 114 abuts against the common elastic member 14, and the push rod 113 penetrates through the center of the spring limiting member 114. By providing the spring stopper 114 between the second end of the valve body part 2 and the normal elastic member 14, it is facilitated to provide a sufficient space for the stroke of the stem 113.

The spring retainer 114 includes a guide tube 1141, a side connection plate 1142, and a curved plate 1143. The guide tube 1141 is sleeved on the mandril 113; side connecting plate 1142 is fixed in the side of stand pipe 1141, and each side connecting plate 1142 encircles stand pipe 1141 equipartition, and side connecting plate 1142 is equipped with the second constant head tank of pegging graft with ordinary elastic component 14 to fix a position and lead ordinary elastic component 14, improve its stability. The side connecting plate 1142 extends along the radial direction of the guide pipe 1141, the other end of the side connecting plate 1142 is fixed with the curved plate 1143, the curved plate 1143 and the side connecting plate 1142 are arranged in a one-to-one correspondence manner, and the outer surface of the curved plate 1143 is attached to the inner wall surface of the valve body component 2, so that the stability of the spring limiting part 114 is improved, and the stability and reliability of a common spring are improved.

The valve body member 2 includes a three-way joint 21, a valve body 22, and a valve cover 23. The three-way joint 21 is provided with a first water port 214, a second water port 215 and a third water port 216, and a space for accommodating the valve body 22 and the valve core component 1 is formed in the three-way joint 21. The valve body 22 separates the three-way joint 21 into a first chamber 211, a second chamber 212, and a third chamber 213; the valve cover 23 is respectively fixedly connected with one end of the valve body 22 and one end of the three-way joint 21, and the two-way memory alloy spring 12 is abutted against the valve cover 23. The first end of the three-way joint 21 corresponds to the two-way memory alloy spring 12, and the second end of the three-way joint 21 corresponds to the common spring. The middle part of the second end of the three-way joint 21 partially protrudes outward to form a barrel-shaped structure for providing a sufficient movement space for the ram 113.

The valve cover 23 is detachably connected to the valve body 22, and when assembling, the valve cover 23 can be first fixed to the valve body 22 and then installed together in the three-way joint 21.

One of the valve cover 23 and the valve body 22 is provided with a positioning block 231, the other one is provided with a positioning notch 221, a fixing tooth 232 protrudes from the side surface of the positioning block 231, and a fixing groove 222 which is correspondingly clamped with the fixing tooth 232 is arranged on the side wall of the positioning notch 221. The fixing teeth 232 have a limiting surface 2311 and a guide surface 2312, the limiting surface 2311 is perpendicular to the first direction, the guide surface 2312 is arranged obliquely relative to the first direction, a protruding end of the limiting surface 2311 and a protruding end of the guide surface 2312 are in smooth transition, and the limiting surface 2311 and the end surface of the fixing groove 222 are limited mutually. The guide surface 2312 is advantageous for guiding the engagement of the valve cover 23 and the valve body 22 when the valve cover 23 and the valve body 22 are mounted, and the stopper surface 2311 is caught in the fixing groove 222 to prevent the disengagement of the valve cover 23 and the valve body 22 when the valve cover and the valve body are assembled, so that the valve cover 23 and the valve body 22 can be stably and reliably connected.

One side of the positioning block 231 may have a plurality of fixing teeth 232, and correspondingly, the positioning notch 221 has fixing grooves 222 corresponding to the fixing teeth 232 one to one, and the stability is further improved by connecting the fixing teeth 232 and the fixing grooves 222. One or more fixing teeth 232 may be disposed on both sides of the positioning block 231, and correspondingly, fixing grooves 222 may be disposed on both sides of the positioning notch 221. The positioning blocks 231 and the positioning notches 221 may have a plurality of sets, which are uniformly distributed along the circumferential direction of the valve cover 23. The valve cover 23 is uniformly provided with a plurality of positioning notches 221 and positioning blocks 231.

The bonnet 23 includes a threaded cylinder 233 having an external thread and a cap 234, the cap 234 has a threaded cylinder 233 formed by projecting a middle portion of the cap 234 to one side, the threaded cylinder 233 is detachably connected to the valve body 22 and is screwed to the three-way joint 21, and the positioning notch 221 or the positioning block 231 is provided in the threaded cylinder 233. A seal ring is provided between the root of the threaded tubular portion 233 and the three-way joint 21 to improve the sealing performance between them.

A clamping groove 24 for clamping the hydraulic cylinder assembly 13 is formed between the end surface of the valve cover 23 and the end surface of the valve body 22. The valve cover 23 is further provided with a third positioning groove 235 for inserting the two-way memory alloy spring 12, so as to improve the stability of the spring.

The valve body 22 includes splice bar 227 and four ring portions, and these four ring portions are first ring portion 223, second ring portion 224, third ring portion 225 and fourth ring portion 226 that set up in order in the first direction respectively, connect through a plurality of splice bars 227 between two adjacent ring portions, enclose the synthetic hole that supplies water circulation jointly with two ring portions that correspond between the adjacent splice bar 227, and the splice bar 227 evenly arranged on each ring portion of preferred in addition. The first ring portion 223 is detachably connected to the valve cover 23, that is, the positioning block 231 or the positioning notch 221 is located on the first ring portion 223. When the valve core member 1 abuts the second ring portion 224, the first chamber 211 and the second chamber 212 are disconnected, and when the valve core member 1 abuts the third ring portion 225, the second chamber 212 and the third chamber 213 are disconnected.

The outer wall surface of the second ring portion 224 has an annular groove in which a seal ring for sealing the second ring portion 224 and the three-way joint 21 is accommodated, thereby improving the sealability between the first chamber 211 and the second chamber 212.

The outer wall surface of the third ring portion 225 has an annular groove in which a sealing ring is accommodated for sealing the third ring portion 225 and the three-way joint 21, thereby improving the sealing between the second chamber 212 and the third chamber 213.

The valve body 22 further comprises a fixing frame 228, an outer ring of the fixing frame 228 is fixed on the connecting rib 227, and an inner ring of the fixing frame 228 is provided with a fixing hole for the push rod 113 to pass through, thereby realizing the support of the push rod 113 and the guide of the push rod 113. In this embodiment, the middle of the fixing frame 228 is a tube 229, a plurality of ribs 2210 are radially arranged around the tube 229, and the ribs 2210 and the connecting ribs 227 are fixed in a one-to-one correspondence.

Please refer to fig. 11, which will be understood in conjunction with fig. 1-10. The embodiment of the invention also provides a water heater circulating system which comprises the gas water heater 3, the user side 4, the circulating power device 5 and the switching valve.

The gas water heater 3 is used as a combustion component, and the water outlet of the gas water heater is communicated with the user terminal 4 through a first pipeline 6. The water inlet of the circulating power device 5 is communicated with one end of the first pipeline 6 connected with the user end 4. The water inlet of the switching valve is communicated with the water outlet of the circulating power device 5, one water outlet of the switching valve is communicated with the water inlet of the gas water heater 3, and the other water outlet of the switching valve is communicated with the first pipeline 6 at the water outlet of the gas water heater 3.

The water heater circulating system forms two loops, one loop is used as a cold water channel 7 and is realized by a water outlet of the gas water heater 3, a first pipeline 6, a circulating power device 5, a switching valve and a water inlet of the gas water heater 3, and the cold water channel 7 is used for returning water in the system to the gas water heater 3 for continuous heating. The other loop is used as a circulation loop 8 and is realized through the first pipeline 6, the circulation power device 5, the switching valve and the first pipeline 6, water is fully stirred uniformly when circulating in the circulation loop 8, so that the water temperature at each position is uniform, the temperature difference between the water temperature at a near water point and the water temperature at a far water point is small, and the user experience is improved. In addition, the direction of the water flow is illustrated in fig. 11 in a figure with arrows, which does not represent a solid member.

The switching valve is used for automatically adjusting the flow direction of water according to the change of the sensed water temperature, when the water temperature does not exceed the first temperature, the switching valve controls the cold water passage 7 to be completely opened, the circulating water passage to be completely closed, when the water temperature reaches the second temperature, the switching valve automatically controls the circulating water passage to be completely closed, and the cold water passage 7 to be completely closed.

The water heater circulating system further comprises a cold water source 9, wherein the cold water source 9 is used for providing cold water for each user end 4 and the gas water heater 3, and the cold water source 9 is connected with the gas water heater 3 through a water inlet of the circulating power device 5.

The switching valve of the water heater circulation system can be realized by adopting the automatic switching valve 100 described in any one of the embodiments. The second water port 215 is communicated with the water outlet of the circulating power device 5, the first water port 214 is communicated with the water inlet of the gas water heater 3, and the third water port 216 is communicated with the first pipeline 6. A three-way pipe can be arranged at the water outlet of the gas water heater 3, and three ports of the three-way pipe are respectively connected with the water outlet of the gas water heater 3, the first pipeline 6 and the second water outlet 215. When the water temperature is lower than 25 ℃, only the cold water passage 7 operates to heat the water, and when the water temperature reaches 40 ℃, only the circulation circuit 8 operates to stir the water temperature in the circulation. In addition, the hot water circulation system has a set temperature, the second temperature is lower than the set temperature, the circulation loop 8 works, the water temperature sensed by the two-way memory alloy spring 12 is in a continuously rising state in the process of homogenizing the water temperature, when the water temperature reaches the set temperature, the water temperature in the whole circulation loop 8 is basically uniform, and the temperatures of the near water point and the far water point are basically consistent.

In addition, the water heater circulation system can have a plurality of clients 4 arranged in parallel, the first pipeline 6 has interfaces corresponding to the clients 4 one by one, and the water heater circulation system can provide hot water service for a plurality of clients 4 simultaneously.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.