阅读说明：本技术 一种切换阀、稳压泵及水刀设备 (Switching valve, stabilized pressure pump and water jet equipment ) 是由 孙光宇 吴衍 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种切换阀,具有：流体通道,流体通道的两端设有第一出入口和第二出入口,流体通道包括阀腔,阀腔内活动设有阀芯；阀腔的第一端设有第一连通口,且第一连通口与第一出入口连通；阀腔的第二端设有第二连通口,且第二连通口与第二出入口连通；阀腔内靠近第一连通口处具有密封面,第二连通口的中心与阀腔的中心轴线错位设置；第一出入口与第二出入口之间的压力差使得阀芯在第一位置和第二位置之间切换从而使得流体通道开启或关闭。本发明还公开了一种稳压泵和水刀。这种切换阀、稳压泵及水刀设备制造更简单,不容易因为磨损等原因失去单向导通的功能,使用寿命长。(The invention discloses a switching valve, which comprises: the fluid passage is provided with a first inlet and a second outlet at two ends and comprises a valve cavity, and a valve core is movably arranged in the valve cavity; a first communication port is formed at the first end of the valve cavity and communicated with the first inlet and the first outlet; a second communication port is formed in the second end of the valve cavity and communicated with the second inlet and the second outlet; a sealing surface is arranged in the valve cavity close to the first communicating port, and the center of the second communicating port and the central axis of the valve cavity are arranged in a staggered manner; the pressure difference between the first port and the second port switches the valve spool between the first position and the second position such that the fluid passage is opened or closed. The invention also discloses a pressure stabilizing pump and a water jet cutter. The switching valve, the pressure stabilizing pump and the water jet cutter are simpler to manufacture, are not easy to lose the function of one-way conduction due to abrasion and the like, and have long service life.)

1. A switching valve, comprising:

the valve comprises a fluid passage, a valve body and a valve core, wherein a first inlet and a second inlet are formed in two ends of the fluid passage;

a first communication port is formed at the first end of the valve cavity and is communicated with the first inlet and the first outlet; a second communication port is formed in the second end of the valve cavity and communicated with the second inlet and the second outlet; a sealing surface is arranged in the valve cavity close to the first communicating port, and the center of the second communicating port and the central axis of the valve cavity are arranged in a staggered manner;

a pressure difference between the first port and the second port may cause the valve spool to switch between a first position and a second position; when the pressure of the first inlet and the second inlet is higher than that of the second inlet and the second outlet, the valve core moves to the second position, the first inlet and the second inlet are communicated with the second inlet and the second outlet sequentially through the first communication port, the valve cavity and the second communication port, and a fluid channel is opened; when the pressure of the first inlet and the first outlet is smaller than the pressure of the second inlet and the second outlet, the valve core moves to the first position, the valve core is matched and sealed with the sealing surface, the valve cavity is disconnected from the first inlet and the first outlet, and the fluid channel is closed.

2. The switching valve of claim 1, wherein the first communication port opens on the first end concentrically with the valve chamber, and the spool is spherical, spindle-shaped, or frustum-shaped.

3. The switching valve according to claim 2, wherein a side wall of the valve chamber closer to the second communication port is an abutting side, a distance from the abutting side to a center of the second communication port is an abutting distance, and the abutting distance is smaller than a radius of the spool; the distance between the abutting side and the center of the first communication port is an anti-collision distance, and the anti-collision distance is larger than the radius of the valve core.

4. The switching valve according to any one of claims 1 to 3, wherein the fluid passage comprises an upper fluid passage and a lower fluid passage, the upper fluid passage comprises a first upper inlet and outlet, a second upper inlet and outlet, a first upper communication port, an upper valve chamber, an upper valve spool, and a second upper communication port, and the lower fluid passage comprises a first lower inlet and outlet, a second lower inlet and outlet, a first lower communication port, a lower valve chamber, a lower valve spool, and a second lower communication port;

the first upper inlet and the first lower inlet are communicated or the second upper inlet and the second lower inlet are communicated, the directions of the sealing surface of the upper valve cavity and the sealing surface of the lower valve cavity are opposite, and when the upper fluid channel is opened, the lower fluid channel is closed.

5. The switching valve of claim 4 comprising an inlet valve and an outlet valve, each of the inlet valve and the outlet valve having the upper fluid passage and the lower fluid passage therein; a first upper inlet and a first lower inlet of the water inlet valve are communicated, and a second upper inlet and a second lower inlet of the water outlet valve are communicated; the second upper inlet and outlet of the water inlet valve are connected with the first upper inlet and outlet of the water outlet valve, and the second lower inlet and outlet of the water inlet valve are communicated with the first lower inlet and outlet of the water outlet valve.

6. The switching valve of claim 5, wherein the difference between the cross-sectional area of the valve chamber and the maximum cross-sectional area of the valve spool is S1, the minimum cross-sectional area of the fluid passage is S2, and the S1 is 0.1 to 10 times that of S2.

7. The switching valve of claim 6, wherein the S1 is equal to the S2.

8. The switching valve of claim 6, wherein the outlet valve further comprises an outlet passage for discharging water to the outside of the valve, the second upper and lower ports merging into the outlet passage, and the outlet passage has a cross-sectional area of S2.

9. The switching valve of claim 5, wherein the abutment distance is greater than a radius of the second upper and lower communication ports and the abutment distance is less than a radius of the valve chamber.

10. The switching valve according to claim 5, wherein the second upper communication port and the second lower communication port have an area not smaller than a difference between a cross-sectional area of the valve chamber and a maximum cross-sectional area of the spool.

11. The switching valve of claim 5, wherein the valve chamber moves axially within the valve chamber a distance of 0.1 to 10 times a radius of the second upper and lower communication ports.

12. The switching valve of claim 1, wherein the sealing surface is a conical surface, an included angle of an axial projection of the conical surface is β, and the included angle has a value ranging from 30 ° to β < 180 °; the second end surface is a plane.

13. A pressure maintaining pump comprising a pump body and a switching valve according to any one of claims 5 to 12,

the pump body comprises an upper piston cavity and a lower piston cavity;

the second upper inlet and outlet of the water inlet valve and the first upper inlet and outlet of the water outlet valve are communicated with the upper piston cavity, and the second lower inlet and outlet of the water inlet valve and the first lower inlet and outlet of the water outlet valve are communicated with the lower piston cavity.

14. A water jet apparatus comprising the pressure maintaining pump of claim 13.

Technical Field

The invention relates to the technical field of medical pump bodies, in particular to a switching valve, a pressure stabilizing pump and water jet equipment.

Background

With the development of modern medical equipment, medical water jet scalpel equipment with more mature technology is gradually applied to clinical operations, and the medical water jet scalpel equipment can be used for removing wound wounds, chronic wounds and other soft tissue injuries by utilizing high-pressure injection of physiological saline, does not damage healthy tissues and is beneficial to promoting the rehabilitation process. Wherein, the pressure stabilizing pump for providing high-pressure water flow plays a very important role in the whole medical water jet equipment.

In a switching valve of a pressure stabilizing pump in the existing medical water jet scalpel, one end of a valve cavity and a valve core which are communicated in a one-way mode can be abutted against the valve core to seal and block water flow, and the valve cavity and the valve core are generally conical surfaces; in order to achieve the function, a convex surface or a spring and other parts are arranged in the valve cavity in the prior art, and the valve core is jacked up towards the inside of the valve cavity, so that the valve core cannot be tightly combined with a communication port of the valve cavity, a blocking surface cannot be formed, and the valve core is kept smooth.

However, in the scheme of jacking the valve core inwards, on one hand, during manufacturing, due to the fact that the valve core is small, special-shaped processing is difficult to carry out at the position, and the precision of the valve core has important influence on whether the valve core can ensure the circulation of water or not, so that the processing precision is difficult to ensure; on the other hand, when the valve core impacts on the raised structure under the action of high-speed water flow, the valve core is easily damaged; after long-term use, the convex part is also easy to grind flat, and the valve core becomes easy to block the channel at the position after the convex part is ground flat, so that the function of unidirectional conduction is lost.

Disclosure of Invention

In order to overcome some defects of the prior art, the invention aims to provide a switching valve, a pressure stabilizing pump and water jet equipment, which are simpler to manufacture, are not easy to lose the function of one-way conduction due to abrasion and the like, and have long service life.

The purpose of the invention is realized by adopting the following technical scheme:

a switching valve has:

the valve comprises a fluid passage, a valve body and a valve core, wherein a first inlet and a second inlet are formed in two ends of the fluid passage;

a first communication port is formed at the first end of the valve cavity and is communicated with the first inlet and the first outlet; a second communication port is formed in the second end of the valve cavity and communicated with the second inlet and the second outlet; a sealing surface is arranged in the valve cavity close to the first communicating port, and the center of the second communicating port and the central axis of the valve cavity are arranged in a staggered manner;

a pressure difference between the first port and the second port may cause the valve spool to switch between a first position and a second position; when the pressure of the first inlet and the second inlet is higher than that of the second inlet and the second outlet, the valve core moves to the second position, the first inlet and the second inlet are communicated with the second inlet and the second outlet sequentially through the first communication port, the valve cavity and the second communication port, and a fluid channel is opened; when the pressure of the first inlet and the first outlet is smaller than the pressure of the second inlet and the second outlet, the valve core moves to the first position, the valve core is matched and sealed with the sealing surface, the valve cavity is disconnected from the first inlet and the first outlet, and the fluid channel is closed.

Further, the first communication port and the valve cavity are concentrically arranged on the first end, and the valve core is spherical, spindle-shaped or frustum-shaped.

Further, a side wall of the valve cavity closer to the second communication port is an abutting side, a distance from the abutting side to the center of the second communication port is an abutting distance, and the abutting distance is smaller than the radius of the valve core; the distance between the abutting side and the center of the first communication port is an anti-collision distance, and the anti-collision distance is larger than the radius of the valve core.

Further, the fluid passage comprises an upper fluid passage and a lower fluid passage, the upper fluid passage comprises a first upper inlet and outlet, a second upper inlet and outlet, a first upper communicating port, an upper valve cavity, an upper valve core and a second upper communicating port, and the lower fluid passage comprises a first lower inlet and outlet, a second lower inlet and outlet, a first lower communicating port, a lower valve cavity, a lower valve core and a second lower communicating port;

the first upper inlet and the first lower inlet are communicated or the second upper inlet and the second lower inlet are communicated, the directions of the sealing surface of the upper valve cavity and the sealing surface of the lower valve cavity are opposite, and when the upper fluid channel is opened, the lower fluid channel is closed.

Further, the device comprises a water inlet valve and a water outlet valve, wherein the water inlet valve and the water outlet valve are respectively provided with the upper fluid channel and the lower fluid channel; a first upper inlet and a first lower inlet of the water inlet valve are communicated, and a second upper inlet and a second lower inlet of the water outlet valve are communicated; the second upper inlet and outlet of the water inlet valve are connected with the first upper inlet and outlet of the water outlet valve, and the second lower inlet and outlet of the water inlet valve are communicated with the first lower inlet and outlet of the water outlet valve.

Further, the difference between the cross-sectional area of the valve chamber and the maximum cross-sectional area of the valve core is S1, the minimum cross-sectional area of the fluid passage is S2, and S1 is 0.1 to 2 times that of S2.

Further, the S1 is equal to the S2.

Further, the water outlet valve further comprises a water outlet channel for discharging water to the outside of the valve, the second upper inlet and the second lower inlet converge into the water outlet channel, and the cross-sectional area of the water outlet channel is S2.

Further, the abutting distance is larger than the radius of the second upper communication port and the second lower communication port, and the abutting distance is smaller than the radius of the valve cavity.

Further, the area of the second upper communication port and the second lower communication port is not smaller than the difference between the cross-sectional area of the valve cavity and the maximum cross-sectional area of the valve core.

Further, the valve cavity moves in the valve cavity along the axial direction by a distance which is 0.1-2 times of the radius of the second upper communication port and the second lower communication port.

Furthermore, the sealing surface is a conical surface, the included angle of the axial projection of the conical surface is beta, and the value range of the included angle is more than or equal to 30 degrees and less than 180 degrees; the second end surface is a plane.

The upper fluid channel and the lower fluid channel are arranged in an up-and-down symmetrical mode.

A pressure stabilizing pump comprises a pump body and the switching valve,

the pump body comprises an upper piston cavity and a lower piston cavity;

the second upper inlet and outlet of the water inlet valve and the first upper inlet and outlet of the water outlet valve are communicated with the upper piston cavity, and the second lower inlet and outlet of the water inlet valve and the first lower inlet and outlet of the water outlet valve are communicated with the lower piston cavity.

The water jet equipment comprises the pressure stabilizing pump.

Compared with the prior art, the switching valve, the pressure stabilizing pump and the water jet equipment have the following beneficial effects:

a first inlet and a second inlet in the flow channel are used for inlet and outlet of fluid and form a pressure difference; the valve cavity is communicated with a first inlet and a second inlet through a first communication port and a second communication port at two ends respectively, and the pressure difference between the first inlet and the second inlet causes the valve core to be switched between a first position and a second position, so that the fluid channel is switched between an opening state and a closing state.

When the pressure of the first inlet and the second inlet is higher than that of the second inlet and the second outlet, the valve core moves to the second position, at the moment, because the center of the second communication port is staggered with the central axis of the valve cavity, the second communication port is positioned at one side of the valve cavity, when the valve core is abutted against the second end of the valve cavity under the action of the pressure, the valve core cannot be directly abutted against the edge of the second communication port to form a sealing state, the first inlet and the second inlet are communicated with the second inlet and the second outlet sequentially through the first communication port, the valve cavity and the second communication port, and a fluid channel is opened; when the pressure of the first inlet and the first outlet is smaller than the pressure of the second inlet and the second outlet, the valve core moves to the first position, the valve core is matched and sealed with the sealing surface, the valve cavity is disconnected from the first inlet and the first outlet, and the fluid channel is closed.

The switching valve, the pressure stabilizing pump and the water jet cutter device have the advantages that the second communication port is formed in the switching valve, the pressure stabilizing pump and the water jet cutter device to achieve the effect of one-way conduction, the second end of the valve cavity can be prevented from being provided with a complex bulge or additionally provided with a spring and other structures, the manufacturing is simpler, the damage to the valve core and the valve cavity is smaller during the use, and the service life is longer.

Drawings

FIG. 1 is a schematic partial cross-sectional view of a switching valve of the present invention with a fluid passage in an open state;

FIG. 2 is a schematic, partially cross-sectional view of a fluid passage in a switching valve of the present invention in a closed state;

FIG. 3 is an enlarged view at C of FIG. 1;

FIG. 4 is a side view of a pressure maintaining pump of the present invention;

FIG. 5 is a cross-sectional view of the present invention taken at a first position A-A of FIG. 4;

FIG. 6 is a cross-sectional view of the present invention taken at a first position B-B of FIG. 4;

FIG. 7 is a cross-sectional view of the present invention taken at a second position A-A of FIG. 4;

FIG. 8 is a cross-sectional view of the present invention taken at a second position B-B of FIG. 4;

FIG. 9 is an exploded view of a pressure maintaining pump of the present invention;

fig. 10 is a perspective view of a pressure maintaining pump of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

In the description of the present application, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in FIG. 5, which is based on the orientation or positional relationship shown in FIG. 5, and is used merely for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be taken as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

A switching valve has:

the valve comprises a fluid passage 4, wherein a first inlet and a second outlet 41 and 42 are arranged at two ends of the fluid passage 4, the fluid passage 4 comprises a valve cavity 44, and a valve core 45 is movably arranged in the valve cavity 44;

a first communication port 43 is formed at a first end of the valve cavity 44, and the first communication port 43 is communicated with the first inlet and outlet 41; a second end of the valve cavity 44 is provided with a second communication port 46, and the second communication port 46 is communicated with the second inlet and outlet 42; a sealing surface 441 is arranged in the valve cavity 44 near the first communication port 43, and the center of the second communication port 46 is arranged in a staggered manner with the central axis of the valve cavity 44;

a pressure difference between the first port 41 and the second port 42 enables the valve spool to be switched between a first position and a second position;

as shown in fig. 1, when the pressure of the first port 41 is higher than the pressure of the second port 42, the valve body moves to the second position, the first port 41 is communicated with the second port 42 through the first communication port 43, the valve chamber 44, and the second communication port 46 in this order, and the fluid passage 4 is opened;

as shown in fig. 2, when the pressure of the first port 41 is lower than the pressure of the second port 42, the valve element moves to the first position, the valve element is sealed by the sealing surface 441, the valve chamber 44 is disconnected from the first port 41, and the fluid passage 4 is closed.

A first port 41 and a second port 42 in the flow channel are used for fluid ingress and egress, and form a pressure difference; the valve chamber 44 communicates with the first port 41 and the second port 42 through the first communication port 43 and the second communication port 46 at both ends, respectively, and the pressure difference between the first port 41 and the second port 42 causes the valve spool to switch between the first position and the second position, thereby switching the fluid passage 4 between the open and closed states.

When the pressure of the first inlet/outlet 41 is greater than the pressure of the second inlet/outlet 42, the valve core moves to the second position, and at this time, because the center of the second communication port 46 is displaced from the central axis of the valve chamber 44, the second communication port 46 is located at one side of the valve chamber 44, when the valve core 45 abuts against the second end of the valve chamber 44 under the action of the pressure, the edge of the second communication port 46 is not directly abutted to form a sealed state, the first inlet/outlet 41 is communicated with the second inlet/outlet 42 through the first communication port 43, the valve chamber 44 and the second communication port 46 in sequence, and the fluid passage 4 is opened; when the pressure of the first port 41 is lower than the pressure of the second port 42, the valve element moves to the first position, the valve element is sealed by the sealing surface 441, the valve chamber 44 is disconnected from the first port 41, and the fluid passage 4 is closed.

In a preferred embodiment, the first communication opening 43 is provided at the first end concentrically with the valve chamber 44, and the second communication opening 46 is provided at the second end eccentrically with the valve chamber 44. The first communication port 43 is provided with a sealing surface 441 which is arranged at the central position concentric with the valve cavity 44 so that the valve core 45 can be quickly aligned and sealed when moving to the position from all directions; the eccentric second communication port 46 is offset from both the central axis of the valve chamber 44 and the central axis of the second communication port 46, and prevents the valve element 45 from being locked in the second communication port 46 when it moves to the second position.

The valve body 45 in the present embodiment is preferably spherical, spindle-shaped, or frustum-shaped so as to be in contact with the sealing surface of the first communication port 43 and to avoid blocking the second communication port 46.

As shown in fig. 3, in particular, the valve chamber 44 is spaced from the second communication port 46

The closer side wall is an abutment side 442, the distance of the abutment side 442 from the center of the second communication port 46 is an abutment distance L2, and the abutment distance L2 is smaller than the radius r1 of the valve spool 45. This distance ensures that when the valve element 45 is moved to the second position, the valve element 45, being larger than the second communication opening 46, can only abut against the inner side of the second end of the valve chamber 44 at the lower end thereof without blocking the second communication opening 46, and fluid can flow around the valve element 45 into the second communication opening 46 and then out of the valve chamber 44. The distance between the abutting side 442 and the center of the first communication opening 43 is an interference prevention distance L1, the interference prevention distance L1 is greater than the radius r1 of the valve core 45, and this distance ensures that the valve core 45 can completely abut against the sealing surface 441 when moving to the first position, and cannot abut against the valve cavity 44 due to the blocking of the inner wall. The two sets of dimensional relationships enable the valve cavity 44 and the valve core 45 in the embodiment to realize the effect of one-way conduction under the pushing of pressure difference, no other structures are needed, the manufacture is simple and convenient, and the requirement on precision is low.

As a further preferable aspect of the abutting distance, the abutting distance L2 is greater than the radius r2 of the second upper communication port 4e6 and the second lower communication port 4f6, and the abutting distance L2 is smaller than the radius r3 of the valve chamber 44. The abutting distance L2 reflects the offset degree of the second upper communication port 4e6 and the second lower communication port 4f6 relative to the valve cavity 44, when the offset degree is too large, the change of the water flow direction is large, the resistance and the turbulence degree of the water flow can be increased, the valve core 45 is easy to impact randomly in the valve cavity 44, the flow rate is disturbed, and the trend is difficult to control; when the offset distance is too small, the valve body 45 easily blocks most of the second upper communication port 4e6 or the second lower communication port 4f6, and the water flow is too large, resulting in an excessive pressure. The value in the embodiment can make the flow direction of the water flow more controllable, and the water flow direction more stable, so that the movement of the valve core 45 in the valve cavity 44 is more controllable; meanwhile, the valve core 45 does not block the second upper communication port 4e6 or the second lower communication port 4f6, and normal flow of water between the valve chamber 44 and the second upper communication port 4e6 or the second lower communication port 4f6 can be ensured.

As shown in fig. 4 to 8, as a preferable mode of the present embodiment, the fluid passage 4 includes an upper fluid passage 4e and a lower fluid passage 4f, the upper fluid passage 4e includes a first upper inlet/outlet 4e1, a second upper inlet/outlet 4e2, a first upper communication port 4e3, an upper valve chamber 4e4, an upper valve core 4e5 and a second upper communication port 4e6, and the lower fluid passage 4f includes a first lower inlet/outlet 4f1, a second lower inlet/outlet 4f2, a first lower communication port 4f3, a lower valve chamber 4f4, a lower valve core 4f5 and a second lower communication port 4f 6;

the first upper port 4e1 and the first lower port 4f1 are communicated or the second upper port 4e2 and the second lower port 4f2 are communicated, the sealing surface 441 of the upper valve chamber 4e4 and the sealing surface 441 of the lower valve chamber 4f4 are opposite in direction, and when the upper fluid passage 4e is opened, the lower fluid passage 4f is closed.

When the first upper inlet and outlet 4e1 and the first lower inlet and outlet 4f1 are communicated, the first upper inlet and outlet 4e1 and the first lower inlet and outlet 4f1 have a one-way water inlet function, and the second upper inlet and outlet 4e2 and the second lower inlet and outlet 4f2 can only realize water outlet at most; when the second upper port 4e2 and the second lower port 4f2 are communicated, the second upper port 4e2 and the second lower port 4f2 function as a single-way water outlet, and the first upper port 4e1 and the first lower port 4f1 can only realize water inlet at most. Preferably, the upper flow path 4e and the lower flow path 4f are vertically symmetrical in order to ensure that the flow of water to the upper flow path 4e and the lower flow path 4f is uniform in size.

As a preferable scheme of the present embodiment, the present invention comprises an inlet valve 2 and an outlet valve 3, wherein the inlet valve 2 and the outlet valve 3 both have the upper fluid channel 4e and the lower fluid channel 4f therein; the first upper port 4e1 of the water inlet valve 2 is communicated with the first lower port 4f1, and the second upper port 4e2 of the water outlet valve 3 is communicated with the second lower port 4f 2; the second upper port 4e2 of the inlet valve 2 is connected with the first upper port 4e1 of the outlet valve 3, and the second lower port 4f2 of the inlet valve 2 is communicated with the first lower port 4f1 of the outlet valve 3.

In the switching valve having the above-described configuration, there are two types of water paths due to a change in differential pressure:

the first water path is as follows:

as shown in fig. 5, in the feed valve 2, the water flows in from the first upper inlet 4e1 and/or the first lower inlet 4f1, and passes through the first upper communication port 4e3, the upper valve chamber 4e4, the second upper communication port 4e6, and the second upper inlet 4e2 in this order;

as shown in fig. 6, in the outlet valve 3, since the second inlet/outlet 42 of the inlet valve 2 communicates with the first upper inlet/outlet 4e1 of the outlet valve 3, the water flowing out of the second upper inlet/outlet 4e2 of the inlet valve 2 continues to flow to the first upper inlet/outlet 4e1 of the outlet valve 3, passes through the first upper communication port 4e3, the upper valve chamber 4e4, the second upper communication port 4e6, and finally flows out of the second upper inlet/outlet 4e2 and/or the second lower inlet/outlet 4f 2.

The second water path is as follows:

as shown in fig. 7, in the water inlet valve 2, water flows from the first upper inlet and outlet 4e1 and/or the first lower inlet and outlet 4f1 and sequentially passes through the first lower communication port 4f3, the lower valve chamber 4f4, the second lower communication port 4f6 and the second lower inlet and outlet 4f 2;

as shown in fig. 8, in the outlet valve 3, since the second inlet/outlet 42 of the inlet valve 2 communicates with the first lower inlet/outlet 4f1 of the outlet valve 3, the water flowing out of the second lower inlet/outlet 4f2 of the inlet valve 2 continues to flow to the first lower inlet/outlet 4f1 of the outlet valve 3, passes through the first lower communication port 4f3, the lower valve chamber 4f4, and the second lower communication port 4f6 in this order, and finally flows out of the second upper inlet/outlet 4e2 and/or the second lower inlet/outlet 4f 2.

As a preferable mode of this embodiment, the difference between the cross-sectional area of the valve chamber 44 and the maximum cross-sectional area of the valve core 45 is S1, the minimum cross-sectional area of the fluid passage 4 is S2, and S1 is 0.1 to 10 times, more preferably 0.1 to 2 times, that of S2, and preferably S1 and S2 are equal to avoid an excessive pressure change when the fluid flows to the minimum cross-sectional area. S1 is a key parameter for ensuring the on-off of water flow, if S1 is too large, the pressure difference is insufficient, and the valve core 45 cannot be pushed to move; if S1 is too small, it will become the position of the maximum pressure difference in the entire switching valve, which is not favorable for opening and closing the inlet valve 2 and the outlet valve 3. In the embodiment, the smallest cross-sectional area in the whole fluid channel 4 is particularly selected as the relevant factor of the S1, so that the S1 at least can meet the normal flow of the smallest flow passage area, and the normal operation of the whole pressure stabilizing pump system is ensured. Wherein the minimum cross-sectional area of the fluid channel 4 is in the range of 0.01mm²To 100mm²Preferably 1mm, of²To 10mm²The minimum flow passage area in the range can meet the requirement of the water jet on the water flow, and is determined according to the whole volume of the switching valve, particularly when the switching valve is used in a pressure stabilizing pump of the water jet.

In order to further increase the outlet pressure, the outlet valve 3 further includes an outlet passage for discharging water to the outside of the valve, into which the second upper port 4e2 and the second lower port 4f2 merge, and the cross-sectional area of the outlet passage is S2. The water outlet channel collects the water flow of the second upper inlet and outlet 4e2 and the second lower inlet and outlet 4f2, the water flow respectively flows out of the second upper inlet and outlet 4e2 and the second lower inlet and outlet 4f2, then flows into the water outlet channel together, and finally flows out of the valve, and the cross section area of the water outlet channel is minimum, so that the water outlet flow rate and the pressure can be increased.

As a preferable mode of the present embodiment, the areas of the second upper communication port 4e6 and the second lower communication port 4f6 are not smaller than the difference between the cross-sectional area of the valve chamber 44 and the maximum cross-sectional area of the valve spool 45. The flow area of the water flow in the valve chamber 44 is not smaller than the flow area after the water flows out from the second upper communication port 4e6 and the second lower communication port 4f6, the flow rate of the water flow is ensured, and the pressure does not increase when the water flows out of the valve chamber 44 to block the fluid from flowing out of the valve chamber 44.

As a preferable mode of the present embodiment, the valve chamber 44 moves in the axial direction within the valve chamber 44 by a distance of 0.1 to 10 times, preferably 0.1 to 2 times, the radius of the second upper communication port 4e6 and the second lower communication port 4f 6. The water jet scalpel is used in clinical operation with high requirement on timeliness, so when the water jet scalpel is started, the ejected water flow needs to quickly reach the required water quantity and flow rate; when the water jet cutter is closed, the water flow can be quickly stopped, and high requirements are provided for the working efficiency and the response speed of the pressure stabilizing pump. In the present embodiment, since the valve body 45 blocks the second upper communication port 4e6 and the second lower communication port 4f6 by moving in the axial direction, the larger the axial movement distance of the valve body 45, the longer the time required for the valve body to move in the axial direction, and the longer the response time, which is disadvantageous to the quick response operation.

As a preferable solution of this embodiment, the sealing surface 441 is a conical surface, an included angle of an axial projection of the conical surface is β, and a value range of the included angle is β ≦ 30 ° and less than 180 °; the second end surface is a plane.

The embodiment also provides a pressure stabilizing pump, which comprises a pump body 1 and the switching valve,

the pump body 1 comprises an upper piston cavity 11 and a lower piston cavity 12, and pistons (not shown in the figure) are arranged in the upper piston cavity 11 and the lower piston cavity 12;

the second upper port 4e2 of the inlet valve 2 and the first upper port 4e1 of the outlet valve 3 are communicated with the upper piston cavity 11, and the second lower port 4f2 of the inlet valve 2 and the first lower port 4f1 of the outlet valve 3 are communicated with the lower piston cavity 12.

When the pressure in the upper piston chamber 11 is lower than the pressure in the lower piston chamber 12, in the water inlet valve 2, water flows from the first upper inlet and outlet 4e1 and/or the first lower inlet and outlet 4f1, and passes through the first upper communication port 4e3, the upper valve chamber 4e4, the second upper communication port 4e6 and the second upper inlet and outlet 4e2 in sequence; in the outlet valve 3, since the second inlet/outlet 42 of the inlet valve 2 communicates with the first upper inlet/outlet 4e1 of the outlet valve 3, the water flowing out of the second upper inlet/outlet 4e2 of the inlet valve 2 continues to flow to the first upper inlet/outlet 4e1 of the outlet valve 3, passes through the first upper communication port 4e3, the upper valve chamber 4e4, the second upper communication port 4e6, and finally flows out of the second upper inlet/outlet 4e2 and/or the second lower inlet/outlet 4f 2.

When the pressure in the upper piston cavity 11 is higher than the pressure in the lower piston cavity 12, in the water inlet valve 2, water flows from the first upper inlet and outlet 4e1 and/or the first lower inlet and outlet 4f1 to sequentially pass through the first lower communication port 4f3, the lower valve cavity 4f4, the second lower communication port 4f6 and the second lower inlet and outlet 4f 2; in the outlet valve 3, since the second inlet/outlet 42 of the inlet valve 2 communicates with the first lower inlet/outlet 4f1 of the outlet valve 3, the water flowing out of the second lower inlet/outlet 4f2 of the inlet valve 2 continues to flow to the first lower inlet/outlet 4f1 of the outlet valve 3, passes through the first lower communication port 4f3, the lower valve chamber 4f4, and the second lower communication port 4f6 in this order, and finally flows out of the second upper inlet/outlet 4e2 and/or the second lower inlet/outlet 4f 2.

As a preferable scheme of the specific structure of the pressure stabilizing pump, the pump body 1 is further provided with two upper connectors 13 and two lower connectors 14, and the water inlet valve 2 and the water outlet valve 3 respectively comprise a group of first connectors 51, second connectors 52 and third connectors 53 which are provided with channels inside and are communicated with each other; the two upper interfaces 13 are respectively spliced with the first joints 51 on the water inlet valve 2 and the water outlet valve 3 so as to be communicated with the upper piston cavity 11; the two lower connectors 14 are respectively inserted with the second connectors 52 on the water inlet valve 2 and the water outlet valve 3 so as to be communicated with the lower piston cavity 12; the third joint 53 in the inlet valve 2 is used for feeding water from the outside of the valve, and the third joint 53 in the outlet valve 3 is used for feeding water to the outside of the valve.

The water jet equipment comprises the pressure stabilizing pump. The water jet scalpel is more suitable for conveying high-pressure liquid, has better sealing performance, and can obtain better use experience when being used in clinical operations.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.