阅读说明：本技术 一种基于水力发电的自动断水装置 (Automatic water cut-off device based on hydroelectric power generation ) 是由 尹艳梅 廖胜细 林凯 肖庭敏 郑志鹏 于 2019-11-08 设计创作，主要内容包括：本发明公开了一种基于水力发电的自动断水装置,包括：壳体,具有进水口、出水口、通流口,由进水口流入的水流经由通流口流至出水口；电磁阀,与通流口相配合以开闭通流口；电路板,与电磁阀电连接并控制电磁阀在水流的流动时间或流量达到预设值后关闭通流口；水力发电单元,包括设于壳体内的叶轮和发电机,当水流流经叶轮时带动叶轮转动,进而使得发电机发电,发电机对电路板进行供电；手动开关,用于手动开启电磁阀,或手动使得水流流经水力发电单元以使得水力发电单元对电路板进行供电进而控制开启电磁阀。本发明的技术方案无需对自动断水装置进行外部供电,其通过自身的水力发电进行供电,并且采用手动开启通水,功能可靠。(The invention discloses an automatic water cut-off device based on hydroelectric power generation, which comprises: the shell is provided with a water inlet, a water outlet and a through flow port, and water flowing in from the water inlet flows to the water outlet through the through flow port; the electromagnetic valve is matched with the through-flow port to open and close the through-flow port; the circuit board is electrically connected with the electromagnetic valve and controls the electromagnetic valve to close the through-flow port after the flowing time or the flow of water flow reaches a preset value; the hydroelectric generation unit comprises an impeller and a generator which are arranged in the shell, when water flows through the impeller, the impeller is driven to rotate, so that the generator generates electricity, and the generator supplies power to the circuit board; and the manual switch is used for manually opening the electromagnetic valve, or manually enabling water flow to flow through the hydroelectric generation unit so that the hydroelectric generation unit supplies power to the circuit board and then controls the electromagnetic valve to be opened. According to the technical scheme, the automatic water cut-off device does not need to be externally powered, the automatic water cut-off device is powered by the hydroelectric power of the automatic water cut-off device, water is supplied by manually starting, and the automatic water cut-off device is reliable in function.)

1. An automatic water cut-off device based on hydroelectric power generation, comprising:

the shell is provided with a water inlet, a water outlet and a through flow port positioned between the water inlet and the water outlet, and water flowing from the water inlet flows to the water outlet through the through flow port;

the electromagnetic valve is matched with the through-flow port to open and close the through-flow port;

the circuit board is electrically connected with the electromagnetic valve and controls the electromagnetic valve to close the through flow port after the flowing time or the flow of the water flow reaches a preset value;

the hydroelectric generation unit comprises an impeller and a generator which are arranged in the shell, when the water flow flows through the impeller, the impeller is driven to rotate, so that the generator generates electricity, and the generator supplies power to the circuit board;

and the manual switch is used for manually opening the electromagnetic valve, or manually enabling the water flow to flow through the hydroelectric generation unit so that the hydroelectric generation unit supplies power to the circuit board and further controls the electromagnetic valve to be opened.

2. The automatic water shut-off device based on hydroelectric power generation of claim 1, further comprising a detection unit electrically connected to the circuit board, wherein the detection unit detects a flow time or a flow rate of the water flow;

and when the detection unit detects that the flowing time or the flow of the water flow reaches a preset value, the control module on the circuit board controls the electromagnetic valve to close the through flow port according to the detection result of the detection unit.

3. The automatic water shut-off device based on hydroelectric power generation of claim 2, wherein the detection unit comprises a hall element and a magnet arranged on the impeller, and the hall element senses the magnet to detect the number of turns of the impeller so as to obtain the flowing time or flow rate of the water flow; or, the detection unit obtains the flowing time of the water flow by detecting the duration of the current or voltage of the circuit board.

4. The automatic water shut-off device based on hydroelectric power generation of claim 1, further comprising a timing unit electrically connected to the circuit board, wherein the timing unit starts timing after the circuit board is powered on, and the control module on the circuit board controls the electromagnetic valve to close the flow opening when the timing of the timing unit reaches a preset value.

5. The automatic water shutoff device based on hydroelectric power generation of claim 1, wherein the manual switch is matched with the electromagnetic valve, the electromagnetic valve comprises a pressure relief channel and a valve core for controlling the on-off of the pressure relief channel, and the manual switch drives the valve core to open the pressure relief channel to open the electromagnetic valve.

6. The automatic water shut-off device based on hydroelectric power generation as claimed in claim 5, wherein the solenoid valve further comprises a pressure chamber and a diaphragm, the pressure relief channel is communicated with the pressure chamber, and the diaphragm is changed with the pressure of the pressure chamber to open or close the flow port to open or close the solenoid valve.

7. The automatic water shutoff device based on hydroelectric power generation as claimed in claim 6, wherein a pressure relief chamber is further formed in the solenoid valve, the pressure relief chamber is communicated with the pressure chamber and the pressure relief passage, water in the pressure relief passage flows to a water outlet, water in the pressure chamber flows to the water outlet after passing through the pressure relief chamber and the pressure relief passage, one end of the valve core extends into the pressure relief chamber and is in open-close fit with an inlet of the pressure relief passage, and the manual switch extends into the pressure relief chamber to drive the valve core to be away from the inlet of the pressure relief passage.

8. The automatic water shut-off device based on hydroelectric power generation as claimed in claim 7, wherein the manual switch is a button assembly movably disposed on the valve body of the solenoid valve, the button assembly includes a button, a linkage member and an elastic member, when the button is pressed, the button drives the valve core to move in a direction away from the inlet of the pressure relief channel through the linkage member, and after the external force is removed, the button and the linkage member are reset under the action of the elastic member.

9. The automatic water shut-off device based on hydroelectric power generation of claim 8, wherein the linkage member is a pressing rod slidably attached to the valve body of the solenoid valve, and an inclined surface is provided at an end of the pressing rod that is engaged with the valve plug, and under the action of the inclined surface, the pressing rod drives the valve plug to slide in a direction perpendicular to the sliding direction of the pressing rod.

10. The automatic water shut-off device based on hydroelectric power generation of claim 1, wherein the housing comprises a first accommodating cavity for accommodating the hydroelectric power generation unit, a second accommodating cavity for accommodating the circuit board, and a third accommodating cavity for accommodating the solenoid valve, the first accommodating cavity and the third accommodating cavity are in water flow communication, and the second accommodating cavity is hermetically arranged so as not to be in communication with the first accommodating cavity and the third accommodating cavity.

11. The automatic water shut-off device based on hydroelectric power generation of claim 10, wherein the first receiving chamber and the second receiving chamber are arranged in parallel along a radial direction of the housing, and a wire hole is formed in a wall between the first receiving chamber and the second receiving chamber, and a wire for connecting the generator and the circuit board is inserted into the wire hole and sealed by potting.

12. The automatic water shutoff device based on hydroelectric power generation as claimed in claim 10, wherein the first receiving chamber is located between the flow opening and the water inlet, and the first receiving chamber is disposed near the water inlet, a flow guide member is disposed between the impeller and the water inlet, and the water flowing from the water inlet is guided by the flow guide member and flows to the impeller to drive the impeller to rotate.

13. The automatic water shut-off device based on hydroelectric power generation as recited in any one of claims 1 to 12, further comprising a display element electrically connected to the circuit board for displaying the preset value and an adjustment key for adjusting the preset value, the display element and the adjustment key being mounted on an outer side of the housing.

14. The automatic water shut-off device based on hydroelectric power generation as claimed in any one of claims 1 to 12, further comprising a battery electrically connected to the circuit board, wherein the circuit board is powered on to store electricity for the battery.

Technical Field

The invention relates to a device for controlling water flow, in particular to an automatic water cut-off device based on hydroelectric power generation.

Background

In order to avoid water resource waste caused by forgetting to close a water outlet device (such as a faucet) or damage of the water outlet device, various automatic water cut-off devices are provided in the prior art, and after the automatic water cut-off devices are arranged on a water path, when the water flow time or the water flow exceeds a preset value, the automatic water cut-off devices can automatically cut off the water flow, so that the waste of water resources is avoided.

Disclosure of Invention

The invention aims to solve the problems and provides an automatic water cut-off device based on hydroelectric power generation, which does not need to be externally supplied with power, is supplied with power through self hydroelectric power generation, has a simple structure and reliable functions, adopts manual opening for water supply, and has reliable functions.

In order to achieve the purpose, the invention provides the following technical scheme: an automatic water cut-off device based on hydroelectric power generation, comprising:

the shell is provided with a water inlet, a water outlet and a through flow port positioned between the water inlet and the water outlet, and water flowing from the water inlet flows to the water outlet through the through flow port;

the electromagnetic valve is matched with the through-flow port to open and close the through-flow port;

the circuit board is electrically connected with the electromagnetic valve and controls the electromagnetic valve to close the through flow port after the flowing time or the flow of the water flow reaches a preset value;

the hydroelectric generation unit comprises an impeller and a generator which are arranged in the shell, when the water flow flows through the impeller, the impeller is driven to rotate, so that the generator generates electricity, and the generator supplies power to the circuit board;

and the manual switch is used for manually opening the electromagnetic valve, or manually enabling the water flow to flow through the hydroelectric generation unit so that the hydroelectric generation unit supplies power to the circuit board and further controls the electromagnetic valve to be opened.

Preferably, the water flow detection device further comprises a detection unit electrically connected with the circuit board, wherein the detection unit detects the flowing time or flow rate of the water flow;

and when the detection unit detects that the flowing time or the flow of the water flow reaches a preset value, the control module on the circuit board controls the electromagnetic valve to close the through flow port according to the detection result of the detection unit.

Preferably, the detection unit comprises a hall element and a magnet arranged on the impeller, and the hall element is used for sensing the magnet to detect the number of turns of the impeller so as to obtain the flowing time or flow rate of the water flow; or, the detection unit obtains the flowing time of the water flow by detecting the duration of the current or voltage of the circuit board.

Preferably, the timing device further comprises a timing unit electrically connected with the circuit board, the timing unit starts timing after the circuit board is powered on, and the control module on the circuit board controls the electromagnetic valve to close the through flow port when the timing of the timing unit reaches a preset value.

Preferably, the manual switch is matched with the electromagnetic valve, the electromagnetic valve comprises a pressure relief channel and a valve core for controlling the on-off of the pressure relief channel, and the manual switch drives the valve core to open the pressure relief channel so as to open the electromagnetic valve.

Preferably, the electromagnetic valve further comprises a pressure chamber and a diaphragm, the pressure relief channel is communicated with the pressure chamber, and the diaphragm is changed along with the pressure of the pressure chamber to open or close the flow opening so as to open or close the electromagnetic valve.

Preferably, a pressure relief cavity is further formed in the electromagnetic valve, the pressure relief cavity is communicated with the pressure cavity and the pressure relief channel, water of the pressure relief channel flows to the water outlet, the water of the pressure cavity flows to the water outlet through the pressure relief cavity and the pressure relief channel, one end of the valve core extends into the pressure relief cavity and is matched with an inlet of the pressure relief channel in an opening and closing mode, and the manual switch extends into the pressure relief cavity to drive the valve core to be far away from the inlet of the pressure relief channel.

Preferably, the manual switch is a key assembly movably arranged on the valve body of the electromagnetic valve, the key assembly comprises a key, a linkage member and an elastic member, when the key is pressed, the key drives the valve core to move towards the direction far away from the inlet of the pressure relief channel through the linkage member, and after the external force is removed, the key and the linkage member reset under the action of the elastic member.

Preferably, the linkage member is a pressure lever slidably attached to a valve body of the electromagnetic valve, an inclined plane is arranged at one end of the pressure lever, which is matched with the valve core, and the pressure lever drives the valve core to slide in a direction perpendicular to the sliding direction of the pressure lever under the action of the inclined plane.

Preferably, the housing includes a first accommodating chamber for accommodating the hydroelectric generation unit, a second accommodating chamber for accommodating the circuit board, and a third accommodating chamber for accommodating the solenoid valve, the first accommodating chamber and the third accommodating chamber are communicated with each other by water flow, and the second accommodating chamber is sealed so as not to be communicated with the first accommodating chamber and the third accommodating chamber.

Preferably, the first accommodating cavity and the second accommodating cavity are arranged in parallel along the radial direction of the shell, and a wire perforation is arranged on the cavity wall between the first accommodating cavity and the second accommodating cavity and used for connecting the generator and the circuit board, and a wire penetrates through the wire perforation and then is sealed through glue pouring.

Preferably, the first accommodating cavity is located between the through flow port and the water inlet, the first accommodating cavity is arranged close to the water inlet, a flow guide piece is arranged between the impeller and the water inlet, and water flowing from the water inlet flows to the impeller to drive the impeller to rotate after being guided by the flow guide piece.

Preferably, the electronic device further comprises a display element electrically connected with the circuit board and used for displaying the preset value and an adjusting key used for adjusting the preset value, wherein the display element and the adjusting key are arranged on the outer side of the shell.

Preferably, the electric vehicle further comprises a storage battery electrically connected with the circuit board, and the storage battery is stored after the circuit board is electrified.

The invention has the beneficial effects that:

1. according to the invention, the hydroelectric generation unit is arranged, when water flows through the impeller, the impeller is driven to rotate, so that the generator generates electricity, the generator supplies power to the circuit board, the circuit board is electrically connected with the electromagnetic valve and controls the electromagnetic valve to close the through-flow port after the flowing time or flow of the water flow reaches a preset value, so that automatic water cut-off is realized, and waste of water resources caused by forgetting to close a water outlet device (such as a water faucet) or damage of the water outlet device is avoided.

2. According to the invention, the electromagnetic valve is manually opened by the manual switch, or the water flow is manually enabled to flow through the hydroelectric generation unit so that the hydroelectric generation unit supplies power to the circuit board and further controls the electromagnetic valve to be opened, so that when the water is supplied by opening the through-flow opening again after the water is automatically cut off, only the manual switch is driven, the electromagnetic valve can be opened again without providing external electric energy to the electromagnetic valve, and the electromagnetic valve is simple in structure and convenient to use.

3. According to the invention, the flow time or flow of the water flow is detected by the detection unit, or the preset value is timed by the timing unit, so that the circuit board can close the through flow port after the flow time or flow of the water flow reaches the preset value, and the structure is simple and easy to realize.

4. The manual switch is matched with the electromagnetic valve, the valve core of the electromagnetic valve is driven by the manual switch to open the pressure relief channel of the electromagnetic valve, and therefore the electromagnetic valve is opened, the structure is simple, and the function is reliable.

5. The manual switch is a key assembly, the key assembly comprises a pressure rod which is connected on a valve body of the electromagnetic valve in a sliding mode, an inclined plane is arranged at one end, matched with the valve core, of the pressure rod, the valve core is driven by the pressure rod to slide in the direction perpendicular to the sliding direction of the pressure rod under the action of the inclined plane, and the manual switch and the valve core are very ingenious in linkage matching structure and compact in structure.

6. The preset value can be adjusted by arranging the display element for displaying the preset value and the adjusting key for adjusting the preset value, so that the product universality is better.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic perspective view of an automatic water shutoff device based on hydroelectric power generation according to an embodiment of the present invention;

FIG. 2 is a schematic exploded perspective view of an automatic water shut-off device based on hydroelectric power generation according to an embodiment of the present invention;

FIG. 3 is a sectional view of an automatic water shut-off device based on hydroelectric power generation according to an embodiment of the present invention in a water-feeding state;

FIG. 4 is a cross-sectional view of an automatic water shut-off device based on hydroelectric power generation according to an embodiment of the present invention in a water shut-off state;

FIG. 5 is a sectional view of the manual switch and the valve core in the water cut-off state of the automatic water cut-off device based on hydroelectric power generation according to an embodiment of the present invention;

fig. 6 is a sectional view of the automatic water shut-off device based on hydroelectric power generation in the process of driving the valve plug by the manual switch according to an embodiment of the present invention;

FIG. 7 is a sectional view showing the engagement between the manual switch and the valve body in the water-feeding state of the automatic water shutoff device based on hydroelectric power generation according to an embodiment of the present invention;

fig. 8 is a cross-sectional view showing the hall element and the magnet of the automatic water shut-off device based on hydroelectric power generation according to an embodiment of the present invention.

The reference signs are:

10-a housing; 11-a water inlet; 12-a water outlet; 13-a through flow port; 14-a first accommodating cavity; 15-a second accommodating cavity; 16-a third accommodating cavity; 17-perforation of the wire; 18-water inlet joint;

20-an electromagnetic valve; 20 a-an upper valve body; 20 b-a lower valve body; 21-a valve core; 22-a membrane; 23-a pressure chamber; 24-a pressure relief cavity; 25-a pressure relief channel; 26-a first spring; 27-passing needle; 28-a second spring; 29-an electromagnet;

30-a circuit board; 31-a second wire;

40-a hydroelectric power generation unit; 41-an impeller; 42-a generator; 43-conductive lines;

50-manual switch (key assembly); 51-key; 52-linkage (strut); 521-a bevel; 53-a resilient member;

60-a detection unit; 61-Hall element; 62-a magnet;

70-a flow guide member;

81-a display element; 82-adjustment key.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 8, an automatic water shutoff device based on hydroelectric power generation includes a housing 10, an electromagnetic valve 20, a circuit board 30, a hydroelectric power generation unit 40, and a manual switch 50, wherein:

the shell 10 is provided with a water inlet 11, a water outlet 12 and a through flow port 13 positioned between the water inlet 11 and the water outlet 12, and water flowing from the water inlet 11 flows to the water outlet 12 through the through flow port 13;

the electromagnetic valve 20 is matched with the through flow port 13 to open and close the through flow port 13;

the circuit board 30 is electrically connected with the electromagnetic valve 20 through a second wire 31 and controls the electromagnetic valve 20 to close the through-flow port 13 when the flow time or the flow rate of the water flow reaches a preset value;

the hydroelectric power generation unit 40 comprises an impeller 41 and a generator 42 which are arranged in the shell 10, when water flows through the impeller 41, the impeller 41 is driven to rotate, so that the generator 42 generates power, and the generator 42 supplies power to the circuit board 30;

the manual switch 50 is used for manually opening the electromagnetic valve 20, namely the manual switch 50 directly drives the electromagnetic valve 20 to open the through-flow opening 13; alternatively, the manual switch 50 may be driven to manually enable water to flow through the hydroelectric power generation unit 40, so that the hydroelectric power generation unit 40 supplies power to the circuit board 30 to control the opening of the electromagnetic valve 20, and at this time, the manual switch 50 indirectly opens the electromagnetic valve 20. The present embodiment specifically adopts the former way of opening the electromagnetic valve 20.

In this embodiment, the device further includes a detection unit 60 electrically connected to the circuit board 30, wherein the detection unit 60 detects the flowing time or flow rate of the water flow; when the detecting unit 60 detects that the flowing time or the flow rate of the water flow reaches a preset value, the control module on the circuit board 30 controls the electromagnetic valve 20 to close the flow opening 13 according to the detection result of the detecting unit 60. The detection unit 60 can adopt the known detection technology, and the present embodiment adopts the hall induction which is commonly used in the water flow sensor for detection.

Specifically, the detection unit 60 includes a hall element 61 and a magnet 62 disposed on the impeller 41, and the hall element 61 senses the magnet 62 to detect the number of turns of the impeller 41 so as to obtain the flowing time or flow rate of the water flow;

alternatively, the duration of the current or voltage of the circuit board 30 by the detection unit 60 to obtain the flowing time of the water flow may also be adopted; or, the detection unit 60 is replaced by a timing unit (not shown) electrically connected to the circuit board 30, the timing unit starts timing after the circuit board 30 is powered on, and the control module on the circuit board 30 controls the electromagnetic valve 20 to close the flow port 13 when the timing of the timing unit reaches a preset value, and similarly, the control module on the circuit board 30 can control the electromagnetic valve 20 to close the flow port 13 when the flow time or flow rate of the water flow reaches a preset value.

In this embodiment, the solenoid valve 20 includes a valve core 21, a diaphragm 22, a water inlet chamber, a pressure chamber 23, a pressure relief chamber 24, and a pressure relief passage 25. The valve core 21 is matched with an inlet of the pressure relief channel 25 to control the on-off of the pressure relief channel 25, the pressure relief channel 25 is communicated with the pressure cavity 23, the pressure relief cavity 24 is communicated with the pressure cavity 23 and the pressure relief channel 25, water in the pressure cavity 23 flows to the pressure relief channel 25 through the pressure relief cavity 24, and the diaphragm 22 is changed along with the pressure of the pressure cavity 23 to open or close the through flow port 13 so as to realize the opening or closing of the electromagnetic valve 20. One end of the valve element 21 extends into the pressure relief chamber 24 and is in open-close engagement with an inlet of the pressure relief passage 25. The diaphragm 22 is provided with a through flow passing hole, a through needle 27 penetrates through the flow passing hole, an over flow gap is formed between the through needle 27 and the inner wall of the flow passing hole, the pressure cavity 23 is communicated with the water inlet cavity through the over flow gap, the water inlet cavity is communicated with the water inlet 11, water flowing from the water inlet 11 flows into the water inlet cavity, and then a small part of water flows into the pressure cavity 23 through the over flow gap between the through needle 27 and the inner wall of the flow passing hole. The needle 27 is also connected to a first spring 26, and the first spring 26 is urged between the lower valve body 20b and the diaphragm 22 to apply an elastic force to the diaphragm 22 in a direction to close the flow port 13. The specific operation principle of the solenoid valve 20 is well known in the art and will not be described in detail herein.

In this embodiment, the water in the pressure relief channel 25 flows to the water outlet 12, and the water in the pressure chamber 23 flows to the water outlet 12 through the pressure relief cavity 24 and the pressure relief channel 25.

In this embodiment, the valve body of the solenoid valve 20 includes an upper valve body 20a and a lower valve body 20b, the valve core 21 is attached to the upper valve body 20a, the electromagnet 29 is disposed on the upper valve body 20a, the second spring 28 is connected between the valve core 21 and the electromagnet 29, and when the circuit board 30 supplies power to the solenoid valve 20, the second spring 28 extends to make the valve core 21 close the inlet of the pressure relief passage 25.

The manual switch 50 is engaged with the solenoid valve 20, and the manual switch 50 drives the spool 21 to open the pressure relief passage 25 to open the solenoid valve 20. Specifically, a manual switch 50 extends into the pressure relief cavity 25 to actuate the valve element 21 away from the inlet of the pressure relief channel 25. The manual switch 50 is a key assembly 50 movably disposed on the lower valve body 20b of the solenoid valve 20, the key assembly includes a key 51, a linkage 52 and an elastic member 53, when the key 51 is pressed, the key 51 drives the valve body 21 to move in a direction away from the inlet of the pressure relief channel 25 through the linkage 52, and after the external force is removed, the key 51 and the linkage 52 are reset under the action of the elastic member 53.

In this embodiment, the link 52 is a pressing rod 52 slidably attached to the lower valve body 20b of the solenoid valve 20, an inclined surface 521 is disposed at an end of the pressing rod 52 that is engaged with the valve core 21, and the pressing rod 52 drives the valve core 21 to slide in a direction perpendicular to the sliding direction of the pressing rod 52 under the action of the inclined surface 521.

In this embodiment, the housing 10 includes a first accommodating chamber 14 for accommodating the hydroelectric power generation unit 40, a second accommodating chamber 15 for accommodating the circuit board 30, and a third accommodating chamber 16 for accommodating the solenoid valve 20, the first accommodating chamber 14 and the third accommodating chamber 16 are in water flow communication, and the second accommodating chamber 15 is hermetically disposed so as not to be in communication with the first accommodating chamber 14 and the third accommodating chamber 16. After the hydraulic power generating unit 40 is installed in the first accommodating chamber 14 through the water inlet 11, a water inlet joint 18 is connected to the water inlet of the housing 10 so as to limit the hydraulic power generating unit 40 in the first accommodating chamber 14.

In this embodiment, the first accommodating chamber 14 and the second accommodating chamber 15 are arranged in parallel along the radial direction of the housing 10, a wire perforation 17 is arranged on the chamber wall between the first accommodating chamber 14 and the second accommodating chamber 15, and a wire 43 for connecting the generator 42 and the circuit board 30 is sealed by potting after penetrating through the wire perforation 17, so that the first accommodating chamber 14 is not communicated with the second accommodating chamber 15.

In this embodiment, the first accommodating cavity 14 is located between the through-flow opening 13 and the water inlet 11, the first accommodating cavity 14 is disposed near the water inlet 11, a flow guide member 70 is disposed between the impeller 41 and the water inlet 11, the flow guide member 70 is configured to divide a flow of water in the water inlet 11 into a plurality of small flows to flow toward the impeller 41 at a certain angle, and the flow of water flowing from the water inlet 11 flows to the impeller 41 to drive the impeller 41 to rotate after being guided by the flow guide member 70.

In this embodiment, the automatic water cut-off device further includes a display element 81 electrically connected to the circuit board 30 for displaying a preset value and an adjustment key 82 for adjusting the preset value, the display element 81 and the adjustment key 82 are installed on the outer side of the housing 10, but when the preset value needs to be adjusted, only the adjustment key 82 needs to be adjusted, which is very convenient.

In the present embodiment, a battery (not shown) electrically connected to the circuit board 30 is further included, the battery is charged after the circuit board 30 is powered on, and the battery can store excess electricity generated by the hydroelectric power generation unit 40, but when the solenoid valve 20 is not to be driven manually, the solenoid valve 20 can be powered by the battery to open the solenoid valve 20.

It will be appreciated that the hydro-power unit 40 may also be arranged between the through-flow opening 13 and the water outlet 12.

The specific working principle and process of the invention are briefly described as follows:

referring to fig. 4 and 5, in an initial state, the valve core 21 of the solenoid valve 20 moves downward to close the inlet of the pressure relief channel 25, thereby cutting off the communication between the pressure chamber 23 and the pressure relief channel 25, the water in the pressure chamber 23 is in a pressure maintaining state, and since the force bearing area of the diaphragm 22 on one side of the pressure chamber 23 is larger than the force bearing area on one side of the water inlet chamber, the pressure on one side of the diaphragm 22 on one side of the pressure chamber 23 is larger than the pressure on one side of the water inlet chamber, so that the diaphragm 22 keeps closing the flow opening 23, and at this time, the automatic water cut-off device is in a.

Referring to fig. 6, when the automatic water cut-off device needs to be supplied with water, an external force F is applied to the push button 51 along the arrow direction in the figure, the push button 51 drives the link member 52, the inclined surface 521 on the link member 52 abuts against the end of the valve core 21, so that the valve core 21 slides upwards and away from the inlet of the pressure relief channel 25 to open the pressure relief channel 25, then the external force F is removed, and the push button 51 and the link member 52 are reset along the direction opposite to the direction F under the action of the elastic member 53.

Referring to fig. 3 and 7, after the valve core 21 moves upward to open the inlet of the pressure relief channel 25, water in the pressure chamber 23 flows to the water outlet 12 through the pressure relief chamber 24 and the pressure relief channel 25, and at this time, the diaphragm 22 moves upward under the hydraulic pressure of the water inlet chamber to open the through-flow opening 13, so that the automatic water cut-off device is in a water-passing state. In the water-passing state, a small part of the water flowing in from the water inlet 11 flows into the pressure chamber 23 via the flow-through gap between the through needle 27 and the inner wall of the flow-through opening in the membrane 22. After the automatic water cut-off device is supplied with water, water flows through the impeller 41 of the hydroelectric power generation unit 40, so that the generator 42 generates power, and the generator 42 supplies power to the circuit board 30. At the same time, the hall element 61 of the detection unit 60 senses the magnet 62 of the impeller 41, thereby determining the time when the water flows. When the time of the water flow reaches a preset value, the control module on the circuit board 30 controls the valve core 21 of the electromagnetic valve 20 to move downwards to close the inlet of the pressure relief channel 25. Because the pressure relief channel 25 is closed, the water in the pressure cavity 23 cannot be released, and because the force-bearing area of the diaphragm 22 on one side of the pressure cavity 23 is larger than that on one side of the water inlet cavity, the pressure on one side of the diaphragm 22, which is subjected to the pressure cavity 23, is larger than that on one side of the water inlet cavity, the diaphragm moves downwards to close the through-flow opening 23, so that the automatic water cut-off is realized, and the automatic water cut-off device returns to the initial state shown in fig. 4 and 5.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.