CN216479048U - Position selecting valve - Google Patents

Abstract

The application provides a position selecting valve which comprises a valve body and a valve core assembly, wherein the valve body is provided with an air valve chamber, and the air valve chamber is provided with an inlet and an outlet; the valve core assembly comprises a driver and an elastic membrane, the elastic membrane has telescopic elasticity, one end of the elastic membrane is connected with the inner wall of the air valve chamber, and the other end of the elastic membrane is connected with the driver; in the initial state, the elastic membrane naturally extends to block the outlet; the driver is used for driving the elastic membrane to contract so as to open the outlet. This application position selecting valve adopts the elastic membrane as the valve block, and the elastic membrane has telescopic elasticity, and the export is opened easily, has reduced the driver power consumption, stops to stimulate the elastic membrane when the driver, and elastic membrane self can extend naturally and restore to the throne and close the export, can not appear the export and close the problem of failure, greatly reduced because of the export close the jam and the problem of equipment trouble that the failure produced.

Description

Position selecting valve

Technical Field

The application belongs to the technical field of medical instrument accessories, and particularly relates to a position selecting valve.

Background

The dental treatment machine generally comprises a position selecting valve and a central negative pressure suction system, wherein the position selecting valve is installed on a central negative pressure pipeline connecting the dental treatment machine and the central negative pressure suction system and is used for controlling the conduction or the closing of the central negative pressure pipeline. The valve plate is driven by an electromagnetic or pneumatic mode through a pneumatic control position selecting valve for the existing dental suction device, when the outlet is closed, the valve plate is not easy to reset, the outlet is failed to close, the suction is stopped after being delayed, partial liquid is sucked into a pipeline or even the position selecting valve, and the liquid sucked by the suction device is viscous and is very easy to block, so that the dental treatment machine and the position selecting valve can frequently break down.

SUMMERY OF THE UTILITY MODEL

The application aim at provides a select position valve to solve the technical problem that the select position valve block that exists among the prior art is difficult to reset and produces the jam, often breaks down.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: there is provided a selector valve comprising:

the valve body is provided with an air valve chamber, and the air valve chamber is provided with an inlet and an outlet; and

the valve core assembly comprises a driver and an elastic membrane, the elastic membrane has telescopic elasticity, one end of the elastic membrane is connected with the inner wall of the air valve chamber, and the other end of the elastic membrane is connected with the driver; in the initial state, the elastic membrane naturally stretches to block the outlet; the driver is used for driving the elastic membrane to contract so as to open the outlet.

Optionally, the elastic membrane is of a cylindrical structure, and the side portions of the elastic membrane are wavy with at least one outwardly arched structure.

Optionally, the valve body further comprises a main portion and an upper extension portion connecting the main portion; a gas valve chamber formed in the main portion; the upper extension part is provided with an air cavity, and the side wall of the air cavity is provided with a normal through hole and an installation through hole; one end of the constant through hole is communicated with the air cavity, and the other end of the constant through hole is communicated with the outside of the upper extension part; one end of the mounting through hole is communicated with the air cavity, and the other end of the mounting through hole is communicated with the air valve chamber; the driver comprises a driving rod, the driving rod comprises a rod cap and a rod body connected with the rod cap, the rod cap is arranged in the air cavity, the rod cap divides the air cavity into a movable space and a pressurizing space, and the normal through hole is communicated with the pressurizing space; one end of the elastic membrane is connected with the inner wall of the air valve chamber, and the other end of the elastic membrane is connected with one end of the rod body far away from the rod cap.

Optionally, the valve core assembly further comprises a resetting piece, one end of the resetting piece is connected with the inner wall of the air valve chamber, and the other end of the resetting piece is connected with the elastic membrane.

Optionally, the restoring member is sleeved on the periphery of the shaft, and the restoring member is located between the shaft and the elastic membrane.

Optionally, the rod cap comprises a first convex ring and a second convex ring, the side circumference of the first convex ring abuts against the inner side wall of the air cavity, and a concave ring is arranged between the first convex ring and the second convex ring; the valve core assembly also comprises a sealing element which is arranged in the concave ring.

Optionally, the diameter of the first male ring is larger than the diameter of the second male ring.

Optionally, the valve body further comprises a fixing member and a nozzle connected with the fixing member, and the fixing member is connected with the upper extension part; first connect the through-hole and second connect the through-hole have been seted up to the mounting, and first connect the through-hole and connect usually the through-hole, and second connect the through-hole intercommunication connector.

Optionally, the selector valve further comprises a cover, the cover is connected with the upper extension portion, and the cover has a connecting structure.

Optionally, the air valve chamber is a straight-through cavity.

The application provides a select position valve's beneficial effect lies in: the negative pressure pump can be applied to a negative pressure suction system, the negative pressure pump and the suction device are matched for use, the suction device is connected with an inlet of the air valve chamber, the negative pressure pump is connected with an outlet of the air valve chamber, starting work is carried out, the driver drives the elastic membrane to contract, the elastic membrane leaves the outlet position, the outlet is opened, the outlet is communicated with the inlet, the negative pressure pump and the suction device work, sucked gas or liquid can normally enter from the inlet and flow through the air valve chamber and flow out from the outlet, compared with the prior art, the position selecting valve in the application adopts the elastic membrane as a valve block, the elastic membrane has telescopic elasticity, the outlet is easy to open, the energy consumption of the driver is reduced, when the driver stops driving the elastic membrane to contract, the elastic membrane can naturally stretch and reset to close the outlet, the problem of outlet closing failure cannot occur, and the problems of blockage and equipment failure caused by outlet closing failure are greatly reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a position selecting valve provided in an embodiment of the present application;

FIG. 2 is an exploded view of the selector valve of FIG. 1;

FIG. 3 is a schematic side view of the selector valve of FIG. 1;

FIG. 4 is a cross-sectional structural view of the selector valve of FIG. 3 taken along line A-A;

FIG. 5 is a schematic structural view of a valve core assembly of the selective valve of FIG. 2;

FIG. 6 is a schematic structural view of the position selecting valve of FIG. 1 in cooperation with a solenoid valve;

FIG. 7 is a schematic structural view of the position selecting valve of FIG. 1 used in cooperation with a pneumatically controlled needle valve.

Wherein, in the figures, the respective reference numerals:

a position selecting valve 10;

a valve body 200, a main portion 201, an air valve chamber 202, an inlet 203, an outlet 204, an upward extending portion 205, an air chamber 206, a movable space 207, a pressurizing space 208, a mounting through hole 209, an expanding passage 210, a downward extending portion 211, a downward extending passage 212, a fixing member 213, a nipple 214, a first connecting through hole 215, a second connecting through hole 216, a cover 217, an upward extending through hole 218, and a cover through hole 219;

the valve core component 300, an elastic membrane 302, a driving rod 303, a rod cap 304, a rod body 305, a first convex ring 308, a second convex ring 309, a concave ring 310, a sealing element 311, a membrane body 312, a membrane bottom 313, a gasket 314, a fastener 315, an auxiliary through hole 316, a membrane through hole 317 and a resetting element 318;

a solenoid valve 40;

an air control needle valve 50, a needle valve 51 and a microswitch 52.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application 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 present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, 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 specifically limited otherwise.

Referring to fig. 1 to 5, a position selecting valve 10 according to an embodiment of the present application will be described. The position selecting valve 10 can be applied to a negative pressure suction system of a dental therapy machine and has a good position selecting effect. The position selecting valve 10 comprises a valve body 200 and a valve core assembly 300, wherein the valve body 200 is provided with an air valve chamber 202, and the air valve chamber 202 is provided with an inlet 203 and an outlet 204. The valve core assembly 300 comprises a driver and an elastic membrane 302, wherein the elastic membrane 302 has elastic elasticity, one end of the elastic membrane 302 is connected with the inner wall of the air valve chamber 202, and the other end of the elastic membrane 302 is connected with the driver; in the initial state, the elastic membrane 302 is naturally stretched, and the elastic membrane 302 blocks the outlet 204, blocking the outlet 204 from communicating with the inlet 203.

Can be applied to a negative pressure suction system and is matched with a negative pressure pump and a suction device, wherein the suction device is connected with the inlet 203 of the air valve chamber 202, and the negative pressure pump is connected with the outlet 204 of the air valve chamber 202. In the initial state, the driver does not drive the elastic membrane 302 to contract, and the elastic membrane 302 naturally extends and tightly abuts against the inner wall of the air valve chamber 202 to seal the outlet 204, so that the outlet 204 is not communicated with the inlet 203. In operation, when the outlet 204 needs to be opened, the driver is started to drive the elastic membrane 302 to contract, the elastic membrane 302 leaves the position of the outlet 204, the outlet 204 is opened, the outlet 204 is communicated with the inlet 203, the negative pressure pump and the suction device work, and sucked gas or liquid can normally enter from the inlet 203, flow through the gas valve chamber 202 and flow out from the outlet 204; when the outlet 204 needs to be closed, the driver is closed, the driver stops driving the elastic membrane 302 to contract, and the elastic membrane 302 naturally stretches until the elastic membrane 302 tightly abuts against the inner wall of the air valve chamber 202 to block the outlet 204.

This application selection position valve 10 adopts elastic membrane 302 as the valve block, utilizes elastic membrane 302 telescopic elasticity, and export 204 is opened easily, and the drive power consumption is low, stops to stimulate elastic membrane 302 when the driver, and elastic membrane 302 self can extend naturally and reset and close export 204, can not appear export 204 and close the problem of failure, greatly reduced because of export 204 closes the jam and the problem of equipment trouble that the failure produced.

In another embodiment of the present application, referring to fig. 4, the valve body 200 includes a main portion 201 and an extending portion 205 connecting the main portion 201, and the air valve chamber 202 is formed in the main portion 201; the upper extension portion 205 is provided with an air cavity 206, and the side wall of the air cavity 206 is provided with a constant through hole and a mounting through hole 209. One end of the constant through hole is communicated with the air cavity 206, and the other end of the constant through hole is communicated with the outside of the upper extension part 205; one end of the mounting through hole 209 communicates with the air chamber 206, and the other end of the mounting through hole 209 communicates with the air valve chamber 202. The driver comprises a driving rod 303, the driving rod 303 comprises a rod cap 304 and a rod body 305 connected with the rod cap 304, the rod cap 304 is arranged in the air cavity 206, the rod cap 304 divides the air cavity 206 into an active space 207 and a pressurizing space 208, and a normal through hole is communicated with the pressurizing space 208; one end of the elastic membrane 302 is connected to the inner wall of the air valve chamber 202, and the other end of the elastic membrane 302 is connected to the end of the shaft 305 away from the shaft cap 304.

When the pressure-charging device is used, the normal through hole is communicated with an external air source, when the outlet 204 needs to be opened, the air source charges air into the pressure-charging space 208 through the normal through hole, the rod cap 304 is pushed to be away from the main portion 201, the rod body 305 is driven to move towards the upward extending portion 205, the elastic membrane 302 is pulled to be contracted towards the upward extending portion 205, the elastic membrane is separated from the outlet 204, and the outlet 204 is opened, so that the inlet 203 is communicated with the outlet 204. When the outlet 204 needs to be closed, the air source stops inflating the pressurizing space 208, the elastic membrane 302 naturally extends and drives the rod cap 304 to move towards the main portion 201 until the bottom of the elastic membrane 302 abuts against the inner wall of the air valve chamber 202, the outlet 204 is blocked from being communicated with the inlet 203, and the outlet 204 is closed. The position selecting valve 10 can adopt the electromagnetic valve 40 or the pneumatic control needle valve 50 to control the introduction of an external air source, so as to control the opening and closing of the outlet 204, namely, related control modules can be selectively configured under the same valve body 200, thereby realizing free switching of electric control or pneumatic control and being more flexible in operation.

In another embodiment of the present application, the extending portion 205 extends from the inner wall of the mounting through hole 209 to the air valve chamber 202 to form an extending channel 210, one end of the extending channel 210 is communicated with the mounting through hole 209, the other end of the extending channel 210 is communicated with the air valve chamber 202, the shaft 305 of the driving rod 303 passes through the mounting through hole 209 from the air chamber 206, the extending channel 210 telescopically extends into the air valve chamber 202, the mounting through hole 209 and the extending channel 210 both have a guiding function on the movement of the shaft 305, and the extending channel 210 also has a supporting function on the shaft 305, so that the shaft 305 does not deviate from a movement track in the movement process, which causes the problem that the outlet 204 is opened and the outlet 204 is closed.

It will be appreciated that the main portion 201 and the upper extension 205 may be integrally formed to increase the air tightness of the air valve chamber 202 and the air chamber 206, and to reduce the possibility of air leakage.

Alternatively, the air valve chamber 202 is a straight-through type cavity, and the inlet 203 is formed on the side wall of the air valve chamber 202; an outlet 204 is formed at the bottom of the air valve chamber 202, and the outlet 204 is disposed opposite to the air chamber 206. In the state that the outlet 204 is opened, gas or liquid can flow through the gas valve chamber 202 from the inlet 203 and flow to the outlet 204, and the in-process does not have a bent structure, is not easy to accumulate liquid, further reduces the possibility of blockage, reduces the loss of suction energy in the bent structure, and improves the utilization rate of the negative pressure pump.

In another embodiment of the present application, referring to fig. 4, the valve body 200 further includes a lower portion 211 connecting the main portion 201, the lower portion 211 and the upper portion 205 connect both sides of the main portion 201, respectively, in this case, the gas valve chamber 202 is formed between the main portion 201 and the lower portion 211, and the outlet 204 is formed at the lower portion 211; the lower extension 211 is provided with a lower extension passage 212, one end of the lower extension passage 212 is communicated with the outlet 204, and the other end of the lower extension passage 212 is communicated with the outside of the lower extension 211. The lower portion 211 is mainly used for connecting an external mechanism such as a negative pressure pump. Optionally, the main portion 201 and the lower portion 211 are detachably connected, and the connection manner may be a screw joint or a snap joint, or a combination of the screw joint and the snap joint, or other connection manners that facilitate disassembly and secure connection, mainly facilitate assembly of the valve core assembly 300, and maintenance, etc. Optionally, the lower part 211 is provided with an external thread on its periphery, and the external thread provided on the lower part 211 can be screwed to an external mechanism, facilitating the detachment.

In another embodiment of the present application, referring to fig. 1, the valve body 200 further includes a fixing member 213 and a nozzle 214 connected to the fixing member 213, wherein the fixing member 213 is connected to the upper extension portion 205; the fixing member 213 defines a first connecting hole 215 and a second connecting hole 216, the first connecting hole 215 is connected to the common through hole, and the second connecting hole 216 is connected to the nozzle 214. The nipple 214 is used for connecting an external air source, and the fixing member 213 is used for connecting an external control valve, which controls the air source to flow into the pressurized space 208 by controlling the communication between the first connecting through hole 215 and the second connecting through hole 216. The first connecting through hole 215 is communicated with the second connecting through hole 216, so that the air source flows from the nozzle 214 to the first connecting through hole 215 through the second connecting through hole 216, and then flows into the pressurizing space 208 through the second connecting through hole; the first connecting through hole 215 is not communicated with the second connecting through hole 216, so that the air source cannot enter the pressurizing space 208.

In one embodiment, the rod cap 304 comprises a first convex ring 308 and a second convex ring 309, the side circumference of the first convex ring 308 abuts against the inner side wall of the air cavity 206, and a concave ring 310 is arranged between the first convex ring 308 and the second convex ring 309; the valve core assembly 300 further includes a sealing member 311, the sealing member 311 is disposed in the recessed ring 310 to increase air tightness between the rod cap 304 and the pressurized space 208, and prevent air in the pressurized space 208 from leaking to the movable space 207, which may result in driving failure.

Optionally, the diameter of the first convex ring 308 is larger than that of the second convex ring 309, and then the air source flows into the plenum 208 and then pushes both the second convex ring 309 and the first convex ring 308 or the sealing element 311, so that the force-bearing area of the driving rod 303 is increased, and under the condition of the same air source amount, the pushing force of the air source on the driving rod 303 is larger.

In another embodiment of the present application, referring to FIG. 5, the elastic membrane 302 has a tubular configuration, and the sides of the elastic membrane 302 have a wave-like configuration with at least one outwardly arched, i.e., the arched configuration is arched away from the shaft 305. In the initial state, the elastic membrane 302 naturally stretches against the inner wall of the air valve chamber 202 around the outlet 204, i.e. one end of the elastic membrane 302 covers the outlet 204, and the outlet 204 is blocked from communicating with the inlet 203, so as to achieve the effect of closing the valve. The inclined parts on the two sides of the arch-shaped structure have a movement tendency, when the driving rod 303 pulls the elastic film 302 to shrink, the inclined parts on the two sides of the arch-shaped structure are close to each other, and because the inclined parts have a certain angle with the horizontal line, partial reaction force of the elastic film 302 on the driving rod 303 can be dispersed, the shrinkage resistance is reduced, and the elastic film 302 is easier to shrink; when the driving rod 303 stops pulling the elastic membrane 302, the inclined portions on both sides of the arch-like structure of the elastic membrane 302 will naturally open, tending to straighten the arch-like structure until the elastic membrane 302 abuts against the inner wall of the air valve chamber 202. In contrast to the straight tubular structure, the side portion having the arch structure can receive the elastic membrane 302 having a longer length, so that the elastic membrane 302 can be in interference contact with the inner wall of the air valve chamber 202, thereby increasing the sealing property for closing the outlet 204.

Optionally, the elastic membrane 302 comprises a membrane body 312 and a membrane bottom 313, the membrane body 312 is in a cylindrical structure, one end of the membrane body 312 is connected with the inner wall of the air valve chamber 202, the other end of the membrane body 312 is connected with the membrane bottom 313, and the membrane bottom 313 is connected with the driver; the arch-like structure is formed on the film body 312; in the initial state, the width of the diaphragm bottom 313 is larger than that of the outlet 204, and the diaphragm bottom 313 abuts against the inner wall of the gas valve chamber 202 and blocks the outlet 204.

The elastic membrane 302 may be a member made of an elastic material, such as silicone, rubber, or a metal sheet with strong elasticity.

In one embodiment, the valve core assembly 300 further comprises a gasket 314 and a fastener 315, the gasket 314 is provided with an auxiliary through hole 316, the membrane bottom 313 is provided with a membrane through hole 317, one end of the shaft body 305, far away from the rod cap 304, penetrates through the membrane through hole 317 and the auxiliary through hole 316 to be connected with the fastener 315, the membrane bottom 313 and the gasket 314 are fixedly connected to the shaft body 305, and the gasket 314 has a certain protection effect on the membrane bottom 313.

In one embodiment, the cartridge assembly 300 further includes a reset member 318, one end of the reset member 318 is connected to the inner wall of the air valve chamber 202, and the other end of the reset member 318 is connected to the elastic membrane 302. When the outlet 204 is opened, the gas in the pressurized space 208 overcomes the acting force of the elastic membrane 302 and the reset piece 318, pushes the driving rod 303, and further pulls the elastic membrane 302 to contract; when the outlet 204 is closed, the gas in the pressurized space 208 flows out, the elastic membrane 302 and the resetting piece 318 overcome the pressure in the pressurized space 208, the driving rod 303 is pushed, the elastic membrane 302 and the resetting piece 318 naturally stretch, the resetting piece 318 adds assistance to the stretching of the elastic membrane 302, the elastic membrane 302 is enabled to rapidly reset, and the outlet 204 is closed.

Optionally, the restoring member 318 is sleeved on the periphery of the shaft 305, and the restoring member 318 is positioned between the shaft 305 and the elastic membrane 302, so that the shaft 305 can guide the restoration of the elastic membrane 302 and the restoring member 318 simultaneously, and the occupied space of the components is reduced. The restoring member 318 may be a restoring spring or other restoring structure that can assist the elastic membrane 302 in restoring.

In another embodiment of the present application, referring to fig. 6, when the solenoid valve 40 is selected as the external control valve, the solenoid valve 40 is connected to the fixing member 213, and the valve channel of the solenoid valve 40 is selectively communicated with the first connecting through hole 215 and/or the second connecting through hole 216 according to the situation, if it is required to open the outlet 204 of the position selecting valve 10, the solenoid valve 40 is opened, and the valve channel of the solenoid valve 40 is communicated with the first connecting through hole 215 and the second connecting through hole 216, so that the first connecting through hole 215 is communicated with the second connecting through hole 216 through the valve channel, and the air source can enter the pressurized space 208, thereby driving the driving rod 303 to move; when the outlet 204 of the position selecting valve 10 needs to be closed, the electromagnetic valve 40 is closed, the valve passage of the electromagnetic valve 40 is blocked from communicating with the first connecting through hole 215 or the second connecting through hole 216, the first connecting through hole 215 cannot communicate with the second connecting through hole 216, the gas source cannot flow into the pressurizing space 208, the gas in the pressurizing space 208 flows out from the first connecting through hole 215 and the valve passage of the electromagnetic valve 40, the elastic membrane 302 naturally extends, the driving rod 303 moves towards the gas valve chamber 202, and the outlet 204 is closed.

In another embodiment of the present application, referring to fig. 7, when the pneumatic needle valve 50 is used as an external control valve, the valve body 200 further includes a sealing cover 217, the sealing cover 217 is connected to the upper extending portion 205, the sealing cover 217 has a connecting structure, at this time, an upper extending through hole 218 is formed at a position where the upper extending portion 205 is connected to the sealing cover 217, one end of the upper extending through hole 218 is communicated with the sealing cover 217, and the other end of the upper extending through hole 218 is communicated with the air cavity 206. Optionally, the sealing cover 217 is provided with a cover through hole 219, one end of the cover through hole 219 is communicated with the outside of the sealing cover 217, and the other end of the cover through hole 219 is communicated with the upper extension through hole 218; the inside wall of the cover through hole 219 is provided with threads, and the threads of the inside wall of the cover through hole 219 constitute a connection structure.

The air control needle valve 50 comprises a needle valve 51 and a microswitch 52, the needle valve 51 is connected with the fixing piece 213, and a valve passage of the needle valve 51 is selectively communicated with the first connecting through hole 215 and/or the second connecting through hole 216 according to conditions; the microswitch 52 is connected to the cover 217 via a connection structure, and when the driving rod 303 moves to the position where the upper extension 205 is close to the microswitch 52, the rod cap 304 will abut and trigger the microswitch 52.

When the outlet 204 of the position selecting valve 10 needs to be opened, the needle valve 51 is opened, the valve channel of the needle valve 51 is communicated with the first connecting through hole 215 and the second connecting through hole 216, the first connecting through hole 215 is communicated with the second connecting through hole 216 through the valve channel, the air source can enter the pressurizing space 208 to drive the driving rod 303 to move, when the driving rod 303 moves to the position where the upper extension part 205 is close to the micro switch 52, the rod cap 304 triggers the micro switch 52, then the micro switch 52 transmits information to start the negative pressure pump of the negative pressure pump, and therefore the air liquid is controlled to enter the central negative pressure suction system. When the outlet 204 of the position selecting valve 10 needs to be closed, the needle valve 51 is closed, the communication between the valve passage of the needle valve 51 and the first connecting through hole 215 or the second connecting through hole 216 is blocked, the first connecting through hole 215 and the second connecting through hole 216 cannot be communicated, the gas source cannot flow into the pressurizing space 208, the gas in the pressurizing space 208 flows out from the first connecting through hole 215 and the valve passage of the needle valve 51, the elastic membrane 302 naturally extends, the driving rod 303 moves towards the gas valve chamber 202 until the elastic membrane 302 abuts against the inner wall of the gas valve chamber 202 to block the outlet 204 of the gas valve chamber, meanwhile, the rod cap 304 is far away from the microswitch 52, the microswitch 52 is closed, and the negative pressure pump stops working. When the air control needle valve 50 is adopted as an external control valve, the time delay function can be realized by adjusting the size of the needle valve 51 to control the exhaust amount.

The beneficial effect of the position selecting valve 10 that this application provided lies in: compared with the prior art, the position selecting valve 10 can realize integrated switching of electric control and pneumatic control, is low in driving energy consumption, small in overall size and large in flow, the outlet 204 is easy to open and close, the problem of failure in closing the outlet 204 cannot occur, and the problems of accumulated liquid blockage and equipment failure caused by failure in closing the outlet 204 are greatly reduced.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A selector valve characterized in that: the method comprises the following steps:

the valve body is provided with an air valve chamber, and the air valve chamber is provided with an inlet and an outlet; and

the valve core assembly comprises a driver and an elastic membrane, the elastic membrane has telescopic elasticity, one end of the elastic membrane is connected with the inner wall of the air valve chamber, and the other end of the elastic membrane is connected with the driver; in an initial state, the elastic membrane naturally stretches to seal the outlet; the driver is used for driving the elastic membrane to contract so as to open the outlet.

2. The selector valve of claim 1, wherein: the elastic membrane is of a cylindrical structure, and the side part of the elastic membrane is wavy and is provided with at least one arched structure which is arched outwards.

3. The selector valve of claim 1, wherein: the valve body comprises a main part and an upper extending part connected with the main part; the gas valve chamber is formed in the main portion; the upper extension part is provided with an air cavity, and the side wall of the air cavity is provided with a normal through hole and an installation through hole; one end of the constant through hole is communicated with the air cavity, and the other end of the constant through hole is communicated with the outside of the upper extension part; one end of the mounting through hole is communicated with the air cavity, and the other end of the mounting through hole is communicated with the air valve chamber; the driver comprises a driving rod, the driving rod comprises a rod cap and a rod body connected with the rod cap, the rod cap is arranged in the air cavity, the rod cap divides the air cavity into a movable space and a pressurizing space, and the normal through hole is communicated with the pressurizing space; one end of the elastic membrane is connected with the inner wall of the air valve chamber, and the other end of the elastic membrane is connected with one end, far away from the rod cap, of the rod body.

4. A selector valve as set forth in claim 3 wherein: the valve core assembly further comprises a resetting piece, one end of the resetting piece is connected with the inner wall of the air valve chamber, and the other end of the resetting piece is connected with the elastic membrane.

5. The selector valve of claim 4, wherein: the reset piece is sleeved on the periphery of the rod body, and the reset piece is located between the rod body and the elastic membrane.

6. A selector valve as set forth in claim 3 wherein: the rod cap comprises a first convex ring and a second convex ring, the side periphery of the first convex ring is abutted against the inner side wall of the air cavity, and a concave ring is arranged between the first convex ring and the second convex ring; the valve core assembly further comprises a seal disposed in the recessed ring.

7. The selector valve of claim 6, wherein: the diameter of the first convex ring is larger than that of the second convex ring.

8. A selector valve as set forth in claim 3 wherein: the valve body also comprises a fixing piece and a nozzle connected with the fixing piece, and the fixing piece is connected with the upper extending part; first connect the through hole and second connect the through hole have been seted up to the mounting, first connect the through hole intercommunication the constant through hole, second connect the through hole intercommunication the connector.

9. The selector valve as set forth in claim 8, wherein: the valve body further comprises a sealing cover, the sealing cover is connected with the upper extending portion, and the sealing cover is provided with a connecting structure.

10. The selector valve as set forth in claim 1, wherein: the air valve chamber is a straight-through cavity.

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