CN115628303A - Pilot-operated type pneumatic control vacuum mechanical valve - Google Patents

Abstract

The invention discloses a pilot-operated air-controlled vacuum mechanical valve, which comprises a valve body with an inner cavity, one end of the valve body is provided with an air-holding chamber, and the other end of the valve body is provided with a working interface and a normal pressure interface; it also includes a lower trigger mechanism and the upper trigger mechanism, the lower trigger mechanism includes a positive pressure diaphragm and a lower moving assembly, the upper trigger mechanism includes a negative pressure diaphragm and an upper moving assembly; the inner chamber includes a first normal pressure chamber, a second normal pressure chamber, a first negative pressure chamber chamber, the second negative pressure chamber, the working chamber and the negative pressure channel; the lower moving component is connected with the positive pressure diaphragm and moves up and down under the action of the positive pressure diaphragm to communicate or block the first negative pressure chamber and the negative pressure channel; The upper moving component is connected with the negative pressure diaphragm, and moves up and down under the action of the negative pressure diaphragm so that the working chamber is selectively connected to the second negative pressure chamber or the normal pressure interface; this application realizes the purely mechanical control of the opening of the vacuum interface valve. It can be used in vacuum sewage system, which not only reduces the installation cost, but also is very convenient to use and has high reliability.

Description

A pilot-operated air-controlled vacuum mechanical valve

technical field

The invention relates to the technical field of valves, in particular to a pilot-operated air-controlled vacuum mechanical valve.

Background technique

In the traditional vacuum sewage system, a riser or sump is set up at the sewage collection point, and domestic sewage flows into the riser under the action of gravity. The vacuum interface valve is installed on the vacuum drainage pipe between the riser and the vacuum sewage tank. There is a liquid level sensor on the top. After the liquid level sensor detects a high liquid level, the vacuum interface valve is opened by controlling the solenoid valve, and the waste water in the lifter is sucked by vacuum, and the sewage in the lifter is sucked into the vacuum sewage tank for storage. . The riser of this solution needs electricity and needs to lay cables. Not only is the cost high, but also, if the distance between the scattered points is too far, the voltage will be attenuated, thereby affecting the stability of the entire system.

The Chinese utility model patent with the publication number CN214889037U discloses a pneumatic vacuum liquid level control valve. The control valve uses pneumatic pressure to drive the trigger mechanism to move, and uses mechanical structure to control the opening or closing of the vacuum interface valve. The water level in the device is controlled, no need to lay cables, the cost of installation and use has been greatly reduced, and the instability of the entire system caused by voltage attenuation has been avoided. However, the control valve connects or disconnects the connection between the working hole and the negative pressure hole through the magnetic bead moving up and down under the dual action of magnetic force and air pressure, so that the working hole is under positive or negative pressure, thereby controlling the closing or closing of the vacuum interface valve. open; and the magnetic force of the magnetic beads is not easy to quantify, which makes it difficult to guarantee product quality during mass production.

Contents of the invention

Aiming at the defects in the prior art, the purpose of the present invention is to provide a pilot-operated air-controlled vacuum mechanical valve which is easier to guarantee product quality.

The technical scheme adopted in the present invention is:

A pilot-operated air-controlled vacuum mechanical valve includes a valve body with an inner cavity, one end of the valve body is provided with an air-holding chamber for connecting with a lifter, and the other end of the valve body is provided with a valve for connecting with a vacuum interface valve. The working interface and the normal pressure interface for connecting with the normal pressure source;

It also includes a lower trigger mechanism and an upper trigger mechanism, the lower trigger mechanism includes a positive pressure diaphragm and a lower moving assembly, the upper trigger mechanism includes a negative pressure diaphragm and an upper moving assembly; the inner chamber includes a first normal pressure chamber , the second normal pressure chamber, the first negative pressure chamber, the second negative pressure chamber, the working chamber and the negative pressure channel; the positive pressure diaphragm is installed in the inner cavity to isolate the first normal pressure chamber from the air cavity, the negative pressure diaphragm is installed in the inner cavity to isolate the first negative pressure cavity and the second normal pressure cavity; the first normal pressure cavity, the second normal pressure cavity and the normal pressure interface connected; one end of the second negative pressure chamber and the negative pressure channel are connected to the negative pressure source, and the other ends are isolated from each other; the working chamber communicates with the working interface; the first negative pressure chamber passes through The air supply hole is connected with the normal pressure source;

The lower moving component is connected with the positive pressure diaphragm and moves up and down under the action of the positive pressure diaphragm to communicate or block the first negative pressure chamber from the negative pressure channel; the upper moving component It is connected with the negative pressure diaphragm and moves up and down under the action of the negative pressure diaphragm so that the working chamber is selectively connected to the second negative pressure chamber or the normal pressure interface.

Further, the lower moving assembly includes a pin and a counterweight iron, the counterweight iron is arranged on the outside of the positive pressure diaphragm and is located in the air-holding chamber, and the pin is arranged on the positive pressure diaphragm The inner side, and one end thereof passes through the positive pressure diaphragm and is connected to the counterweight iron, and the pin moves in the inner cavity under the action of the positive pressure diaphragm and the counterweight iron to communicate or disconnect The first negative pressure chamber and the negative pressure channel.

Further, the upper trigger mechanism further includes a spring, which is arranged in the first negative pressure chamber and one end of which is against the inner side of the negative pressure diaphragm.

Further, the upper moving assembly includes a valve core and a screw, the valve core is arranged on the outside of the negative pressure diaphragm, the screw is arranged on the inside of the negative pressure diaphragm, and one end of the screw passes through the negative pressure diaphragm. The pressure diaphragm is connected with the valve core; the valve core is provided with an annular sealing body, and the valve core moves up and down under the action of the negative pressure diaphragm and the spring to make the annular sealing body select The positive seal is between the working chamber and the second negative pressure chamber or between the working chamber and the normal pressure interface.

Further, it also includes a guide ring, the guide ring is fixedly installed in the inner cavity, the lower end of the valve core passes through the guide ring and is connected with the screw, and the working chamber is connected to the screw through the guide ring. When the valve core moves downward, the annular sealing body seals on the guide ring to isolate the working chamber from the normal pressure port.

Further, a regulator is also included, and the air supply hole is connected to the normal pressure source through the regulator.

Further, the flow rate of the air supplement hole is smaller than the flow rate of the negative pressure channel.

Further, the valve body includes a valve seat, a valve body and a valve cover, the valve seat and the valve cover are respectively fixedly connected to the upper and lower sides of the valve body, and the positive pressure diaphragm is fixed between the valve seat and the valve cover. Between the body, the negative pressure diaphragm is fixed between the valve cover and the valve body.

Further, the valve cover is provided with a second negative pressure power interface communicating with the second negative pressure chamber, the negative pressure channel is opened on the valve body, and the valve body is provided with the negative pressure port connected to the negative pressure chamber. The first negative pressure power interface communicated with the pressure channel, the first negative pressure power interface and the second negative pressure power interface are both communicated with the negative pressure source.

Further, the air-holding chamber is opened on the valve seat.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the specific embodiments or the prior art. Throughout the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, elements or parts are not necessarily drawn in actual scale.

Fig. 1 is a schematic structural diagram of a pilot-operated air-controlled vacuum mechanical valve provided in the embodiment of the present application;

Fig. 2 is a schematic diagram of the side sectional structure of the pilot-operated air-controlled vacuum mechanical valve provided in the embodiment of the present application in a closed state;

Fig. 3 is a schematic diagram of the positive cross-sectional structure of the pilot-operated air-controlled vacuum mechanical valve provided in the embodiment of the present application in the closed state;

Fig. 4 is a schematic diagram of the positive cross-sectional structure of the pilot-operated air-controlled vacuum mechanical valve provided in the embodiment of the present application in the open state;

Fig. 5 is a schematic diagram of the structure of the valve body provided by the embodiment of the present application;

Fig. 6 is a schematic structural diagram of the guide ring provided by the embodiment of the present application.

Among them, the valve seat 1, the air holding chamber 101, the valve body 2, the first negative pressure chamber 201, the air supply hole 202, the first normal pressure chamber 203, the negative pressure channel 204, the connecting hole 205, the positioning pin 206, the spring 3, the second Liner 4, valve cover 5, second negative pressure chamber 501, working interface 502, working chamber 503, second normal pressure chamber 504, second negative pressure power interface 505, normal pressure interface 506, negative pressure diaphragm 6, card Spring 7, screw 8, O-ring 9, guide ring 10, spool 11, regulator 12, first liner 13, positive pressure diaphragm 14, pin 15, counterweight iron 16.

Detailed ways

Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with specific embodiments. The following examples are only used to illustrate the technical solution of the present invention more clearly, so they are only examples, and should not be used to limit the protection scope of the present invention.

It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

Referring to Figures 1 to 6, a pilot-operated air-controlled vacuum mechanical valve of the present application includes a valve body with an inner cavity, one end of the valve body is provided with an air-holding cavity 101 for connecting with a lifter, and the other end of the valve body is One end is provided with a working port 502 for connecting with a vacuum interface valve and a normal pressure port 506 for connecting with a normal pressure source.

The vacuum mechanical valve also includes a lower trigger mechanism and an upper trigger mechanism, the lower trigger mechanism includes a positive pressure diaphragm 14 and a lower moving assembly, and the upper trigger mechanism includes a negative pressure diaphragm 6 and an upper moving assembly; the inner chamber includes The first normal pressure chamber 203, the second normal pressure chamber 504, the first negative pressure chamber 201, the second negative pressure chamber 501, the working chamber 503 and the negative pressure channel 204; the positive pressure diaphragm 14 is installed in the inner chamber In order to isolate the first normal pressure chamber 203 and the air-holding chamber 101, the negative pressure diaphragm 6 is installed in the inner cavity to isolate the first negative pressure chamber 201 and the second normal pressure chamber 504; The first normal pressure chamber 203 and the second normal pressure chamber 504 communicate with the normal pressure interface 506; one end of the second negative pressure chamber 501 and the negative pressure channel 204 are connected with the negative pressure source, and the other end isolated from each other; the working chamber 503 communicates with the working interface 502 ; the first negative pressure chamber 201 is connected to the normal pressure source through the air supply hole 202 .

The lower moving assembly is connected to the positive pressure diaphragm 14 and moves up and down under the action of the positive pressure diaphragm 14 so that the first negative pressure chamber 201 is communicated with or blocked from the negative pressure channel 204; The moving assembly is connected with the negative pressure membrane 6 and moves up and down under the action of the negative pressure membrane 6 so that the working chamber 503 is selectively communicated with the second negative pressure chamber 501 or the normal pressure interface 506 .

During use, the normal pressure interface 506 is connected to a normal pressure source, which can be the atmosphere, and one end of the second negative pressure chamber 501 and the negative pressure channel 204 can be connected to the negative pressure source through a tee, and the negative pressure source draws air outwards , so that the second negative pressure chamber 501 and the negative pressure channel 204 form a negative pressure state, the air holding chamber 101 is connected with the air holding pipe in the lifter, and the working interface 502 is connected with the vacuum section valve.

In this application, the air-holding chamber 101 is connected to the air-holding pipe in the lifter. The pressure in the air-holding chamber 101 increases or decreases with the change of the liquid level in the lifter, and then the negative pressure source provides negative pressure, and the normal pressure source provides normal pressure. The pressure changes in the first normal pressure chamber 203, the second normal pressure chamber 504, the first negative pressure chamber 201, the second negative pressure chamber 501 and the negative pressure channel 204 respectively arranged in the inner cavity control the positive pressure diaphragm 14 and the negative pressure diaphragm 6 agitate up and down, thereby driving the lower moving assembly connected to the positive pressure diaphragm 14 and the upper moving assembly connected to the negative pressure diaphragm 6 to move up and down, so that the working chamber 503 is connected to the normal pressure interface 506 However, it is in a state of normal pressure to close the vacuum interface valve, or the working chamber 503 is connected to the second negative pressure chamber 501 to be in a negative pressure state to open the vacuum interface valve, so that the opening and closing of the vacuum interface valve can be controlled purely mechanically. It is suitable for the vacuum sewage system, does not need to use electricity, does not need to lay cables, not only reduces the installation cost, but also facilitates the specification and quantification of product quality, is suitable for mass production, is very convenient to use, and has high reliability.

The valve body includes a valve seat 1, a valve body 2 and a valve cover 5. The valve seat 1 and the valve cover 5 are respectively fixedly connected to the upper and lower sides of the valve body 2, and the positive pressure diaphragm 14 is fixed on the valve body. Between the seat 1 and the valve body 2 , the negative pressure diaphragm 6 is fixed between the valve cover 5 and the valve body 2 .

The air-holding chamber 101 is set on the valve seat 1 , and the air-holding chamber 101 is separated from the inner cavity of the valve body by the positive pressure diaphragm 14 , and the air-holding chamber 101 is located outside the positive pressure diaphragm 14 . On the valve seat 1, the space inside the positive pressure diaphragm 14 and the bottom space of the valve body 2 form a first normal pressure chamber 203; The headspace forms a first negative pressure chamber 201 .

The valve body 2 is disc-shaped, and the upper and lower sides of the valve body 2 are provided with positioning pins 206 for easy installation. A central hole is vertically opened along the center of the valve body 2 . The central hole is a through hole, the lower end of which communicates with the first normal pressure chamber 203 , and the upper end communicates with the first negative pressure chamber 201 . The negative pressure channel 204 is opened on the valve body 2, which is arranged radially along the valve body 2, and one end extends to the outer wall of the valve body 2 to form a first negative pressure power interface on the valve body 2, and the other end communicates with the central hole, thereby passing The central hole communicates with the first negative pressure channel 204 . The lower moving mechanism is arranged in the central hole, and its upper end extends into the first negative pressure chamber 201. Through the up and down movement of the lower moving mechanism, the negative pressure channel 204 and the first negative pressure chamber 201 are connected or cut off, and the lower end of the lower moving mechanism passes through. Through the center hole and the positive pressure diaphragm 14, and stretch into the air holding chamber 101, its lower end is always blocked in the center hole, and the negative pressure passage 204 is separated from the first normal pressure chamber 203, so that the negative pressure passage 204 and the first normal pressure chamber The pressure chamber 203 is not connected.

The lower moving assembly includes a pin 15 and a counterweight iron 16. The counterweight iron 16 is arranged on the outside of the positive pressure diaphragm 14 and is located in the air holding chamber 101. The pin 15 is arranged on the positive pressure diaphragm 14. The inner side of the pressure diaphragm 14, and one end thereof passes through the positive pressure diaphragm 14 and is connected with the counterweight iron 16, and the pin 15 is placed under the action of the positive pressure diaphragm 14 and the counterweight iron 16. The inner cavity moves to connect or isolate the first negative pressure chamber 201 and the negative pressure channel 204 .

Specifically, the pin 15 is a cylindrical pin 15 with a truncated cone. It is connected with the counterweight iron 16 arranged in the air-holding cavity 101 in the center of the valve seat 1 . The inner diameter of the upper section of the central hole is greater than the inner diameter of the lower section, and the upper section of the central hole corresponds to the negative pressure channel 204, so that the cylindrical rod of the pin 15 is blocked at the lower end of the central hole, and the negative pressure channel 204 is separated from the first normal pressure chamber 203. The pin 15 The up and down movement of the frustum opens or blocks the upper section of the central hole, thereby communicating or blocking the negative pressure channel 204 and the first negative pressure chamber 201 .

A regulator 12 is also provided on one side of the valve body 2 . The regulator 12 is connected to the air supply hole 202 and communicated with the atmosphere. The first negative pressure chamber 201 is supplied with air through the air supply hole 202 . The flow rate of the air supply hole 202 is less than the flow rate of the negative pressure channel 204. When the first negative pressure chamber 201 communicates with the negative pressure channel 204, the speed of the negative pressure channel 204 sucking air is greater than the speed of the air supply hole 202, so that the first negative pressure Chamber 201 may be in a negative pressure state due to being pumped.

The upper trigger mechanism further includes a spring 3 , which is arranged in the first negative pressure chamber 201 , and one end thereof abuts against the inner side of the negative pressure diaphragm 6 .

An installation groove is provided in the middle part of the upper side of the valve body 2 , the spring 3 is installed in the installation groove, and its upper end abuts against the inner side of the negative pressure diaphragm 6 . When the first negative pressure chamber 201 is under negative pressure, the negative pressure diaphragm 6 is subjected to downward negative pressure, and the spring 3 is compressed; The negative pressure diaphragm 6 bulges upward under the restoring force of the spring 3 .

The valve cover 5 is in the shape of an inverted funnel, small at the top and large at the bottom. The second negative pressure chamber 501 is located on the top of the valve cover 5 , and the working chamber 503 is located in the middle of the valve cover 5 . The bonnet 5 is provided with a second negative pressure power port 505, a working port 502 and a normal pressure port 506 communicating with the inner cavity of the bonnet 5 from top to bottom, the second negative pressure power port 505 communicates with the second negative pressure chamber 501, The working port 502 communicates with the working chamber 503, the normal pressure port 506 can communicate with the working chamber 503 horizontally, and communicate with the second normal pressure chamber 504 vertically, and the first normal pressure chamber 203 and the second normal pressure chamber 504 The connecting holes 205 on the 2 edges communicate with each other. The inner diameter of the second negative pressure chamber 501 is smaller than that of the working chamber 503 , so that there is a step between the second negative pressure chamber 501 and the working chamber 503 .

The upper moving assembly includes a spool 11 and a screw 8, the spool 11 is arranged on the outside of the negative pressure diaphragm 6, the screw 8 is arranged on the inner side of the negative pressure diaphragm 6, and one end thereof is passed through The negative pressure diaphragm 6 is connected to the valve core 11; the valve core 11 is provided with an annular sealing body, and the valve core 11 moves up and down under the action of the negative pressure diaphragm 6 and the spring 3 Move to make the annular sealing body selectively seal between the working chamber 503 and the second negative pressure chamber 501 or between the working chamber 503 and the normal pressure interface 506, so that the working chamber 503 selects It is connected with the normal pressure port 506 to be in a normal pressure state or communicated with the second negative pressure chamber 501 to be in a negative pressure state, so as to drive the vacuum interface valve to close or open.

In order to facilitate the installation of the upper moving assembly and the lower moving assembly, a first backing plate 13 is provided on the inside of the positive pressure diaphragm 14, a second backing plate 4 is provided on the inner side of the negative pressure diaphragm 6, and the lower ends of the pins 15 pass through in turn. After passing through the first lining plate 13 and the positive pressure diaphragm 14, it is connected with the counterweight iron 16, and the upper end of the screw 8 passes through the second lining plate 4 and the negative pressure diaphragm 6 in turn, and is threaded with the valve core 11.

In order to facilitate the sealing of the annular sealing body of the valve core 11 between the working chamber 503 and the normal pressure interface 506, a guide ring 10 is also included. The guide ring 10 is a slotted guide ring 10. Holes, through holes are spaced along the circumference of the guide ring 10 , and the through holes communicate with the normal pressure port 506 . The guide ring 10 is fixedly installed in the inner cavity by the circlip 7, and an O-ring is provided between the outer wall of the upper end of the guide ring 10 and the inner wall of the inner cavity of the bonnet 5 to seal the upper end of the guide ring 10 and the bonnet 5 Gaps between lumens. The lower end of the spool 11 passes through the guide ring 10 and is connected with the screw 8. A plurality of protrusions are arranged along the inner wall of the central through hole of the guide ring 10 so that there is a gap between the valve stem of the spool 11 and the inner wall of the central through hole. , the working chamber 503 communicates with the central through hole of the guide ring 10 through the gap, and thus communicates with the normal pressure port 506 . When the valve core 11 moves downward, the annular sealing body of the valve core 11 seals on the top of the guide ring 10 , thereby isolating the working chamber 503 from the normal pressure interface 506 . When the valve core 11 moves upward, the annular sealing body of the valve core 11 seals on the top step of the valve cover 5 , thereby isolating the working chamber 503 and the second negative pressure chamber 501 .

In this application, the vacuum mechanical valve controls the opening and closing principle of the vacuum interface valve as follows:

The gas pressure in the air-holding chamber 101 connected to the lifter is affected by the liquid level in the lifter. When the liquid level in the lifter is low, the pressure in the air-holding chamber 101 is not high, and it acts on the upward direction of the pin 15 through the positive pressure diaphragm 14. When the pressure is less than the sum of the downward gravity of the counterweight iron 16 and the downward suction of the negative pressure in the negative pressure channel 204 to the pin 15, the pin 15 moves down to the bottom in the inner cavity, and the cone on the pin 15 cuts off the negative pressure channel 204 and the first negative pressure chamber 201; at this time, the first negative pressure chamber 201 slowly enters the air through the air supply hole 202, the first negative pressure chamber 201 becomes normal pressure, and the negative pressure diaphragm 6 acts on the upward restoring force of the spring 3 It bulges up and down, and drives the valve core 11 to move vertically upwards to the top of the inner cavity of the valve cover 5. The annular sealing body on the valve core 11 and the step at the top of the valve cover 5 form a sealing surface, which isolates the working chamber 503 from the second Negative pressure chamber 501; at this time, the upper end of the guide ring 10 is opened due to the upward movement of the annular sealing body, the working chamber 503 communicates with the normal pressure interface 506 through the guide ring 10, and the working chamber 503 is under normal pressure, and the vacuum interface valve Reset off.

When the liquid level in the lifter rises gradually, the gas pressure in the air-holding chamber 101 rises accordingly; when the gas pressure in the air-holding chamber 101 acts on the upward pressure of the pin 15 through the positive pressure diaphragm 14, it is greater than the downward gravity of the counterweight iron 16 and When the negative pressure in the negative pressure channel 204 is the sum of the downward suction of the pin 15, the positive pressure diaphragm 14 will bulge upward, the pin 15 and the counterweight iron 16 will move upward under the action of the positive pressure diaphragm 14, and the cone of the pin 15 will leave The upper end of the center hole makes the negative pressure passage 204 communicate with the first negative pressure chamber 201, and the gas in the first negative pressure chamber 201 is sucked out; The gas velocity is lower than the suction speed of the negative pressure channel 204, and as the gas in the first negative pressure chamber 201 is sucked out, the first negative pressure chamber 201 becomes negative pressure. When the downward negative pressure on the negative pressure diaphragm 6 is greater than the upward elastic force of the spring 3, the negative pressure diaphragm 6 drives the valve core 11 to move vertically downward until the annular sealing body of the valve core 11 and the guide ring The top of 10 forms a sealing surface, which cuts off the working chamber 503 and the normal pressure interface 506; at this time, the lower end of the second negative pressure chamber 501 is opened due to the downward movement of the annular sealing ring, and the second negative pressure chamber 501 and the working chamber 503 Connected, under the suction effect of the second negative pressure power interface 505, the working chamber 503 has a negative pressure, and the vacuum interface valve is opened under the negative pressure.

In this application, unless otherwise clearly stipulated and limited, the terms "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two components or an interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of the invention, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, systems and techniques have not been shown in detail in order not to obscure an understanding of this description.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , system, material or feature is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, systems, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. All of them should be covered by the scope of the claims and description of the present invention.

Claims (10)

1. A pilot-operated air-controlled vacuum mechanical valve, comprising a valve body with an inner cavity, one end of the valve body is provided with an air-holding cavity for connecting with a lifter, and the other end of the valve body is provided with a vacuum interface valve A connected working interface and a normal pressure interface for connecting with a normal pressure source; characterized in that, It also includes a lower trigger mechanism and an upper trigger mechanism, the lower trigger mechanism includes a positive pressure diaphragm and a lower moving assembly, the upper trigger mechanism includes a negative pressure diaphragm and an upper moving assembly; the inner chamber includes a first normal pressure chamber , the second normal pressure chamber, the first negative pressure chamber, the second negative pressure chamber, the working chamber and the negative pressure channel; the positive pressure diaphragm is installed in the inner cavity to isolate the first normal pressure chamber from the air cavity, the negative pressure diaphragm is installed in the inner cavity to isolate the first negative pressure cavity and the second normal pressure cavity; the first normal pressure cavity, the second normal pressure cavity and the normal pressure interface connected; one end of the second negative pressure chamber and the negative pressure channel are connected to the negative pressure source, and the other ends are isolated from each other; the working chamber communicates with the working interface; the first negative pressure chamber passes through The air supply hole is connected with the normal pressure source; The lower moving component is connected with the positive pressure diaphragm and moves up and down under the action of the positive pressure diaphragm to communicate or block the first negative pressure chamber from the negative pressure channel; the upper moving component It is connected with the negative pressure diaphragm and moves up and down under the action of the negative pressure diaphragm so that the working chamber is selectively connected to the second negative pressure chamber or the normal pressure interface. 2. The pilot-operated air-controlled vacuum mechanical valve according to claim 1, wherein the lower moving assembly includes a pin and a counterweight iron, and the counterweight iron is arranged on the outside of the positive pressure diaphragm, and Located in the air-holding cavity, the pin is arranged on the inner side of the positive pressure diaphragm, and one end thereof passes through the positive pressure diaphragm to connect with the weight iron, and the pin is on the positive pressure diaphragm The first negative pressure chamber and the negative pressure channel are connected or separated by moving in the inner cavity under the action of the counterweight iron. 3. The pilot-operated air-controlled vacuum mechanical valve according to claim 1, wherein the upper trigger mechanism further includes a spring, which is arranged in the first negative pressure chamber, and one end of the spring is against the negative pressure chamber. Press the inner side of the diaphragm. 4. The pilot-operated air-controlled vacuum mechanical valve according to claim 3, wherein the upper moving assembly includes a valve core and a screw, the valve core is arranged on the outside of the negative pressure diaphragm, and the screw It is arranged on the inner side of the negative pressure diaphragm, and one end thereof is connected to the valve core through the negative pressure diaphragm; the valve core is provided with an annular sealing body, and the valve core is The diaphragm moves up and down under the action of the spring so that the annular sealing body is selectively sealed between the working chamber and the second negative pressure chamber or between the working chamber and the normal pressure interface. 5. The pilot-operated air-controlled vacuum mechanical valve according to claim 4, further comprising a guide ring, the guide ring is fixedly installed in the inner cavity, and the lower end of the valve core passes through the guide ring , and connected with the screw, the working chamber communicates with the normal pressure interface through the guide ring, when the valve core moves downward, the annular sealing body seals on the guide ring to isolate The working chamber is interfaced with the normal pressure. 6 . The pilot-operated air-controlled vacuum mechanical valve according to claim 1 , further comprising a regulator, and the air supply hole is connected to the normal pressure source through the regulator. 7 . 7 . The pilot-operated air-controlled vacuum mechanical valve according to claim 1 , wherein the flow rate of the air supplement hole is smaller than the flow rate of the negative pressure channel. 8. The pilot-operated air-controlled vacuum mechanical valve according to any one of claims 1 to 7, wherein the valve body includes a valve seat, a valve body and a valve cover, and the valve seat and the valve cover are respectively fixed Connected to the upper and lower sides of the valve body, the positive pressure diaphragm is fixed between the valve seat and the valve body, and the negative pressure diaphragm is fixed between the valve cover and the valve body. 9. The pilot-operated air-controlled vacuum mechanical valve according to claim 8, characterized in that, the valve cover is provided with a second negative pressure power interface communicating with the second negative pressure chamber, and the negative pressure channel Set on the valve body, the valve body is provided with a first negative pressure power interface communicating with the negative pressure channel, the first negative pressure power interface and the second negative pressure power interface are both connected to the negative pressure The pressure source is connected. 10 . The pilot-operated air-controlled vacuum mechanical valve according to claim 1 , wherein the air-holding chamber is opened on the valve seat. 11 .

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