A pilot-operated pneumatically controlled vacuum mechanical valve

Abstract

The present invention discloses a pilot-type air-controlled vacuum mechanical valve, comprising a valve body with an inner cavity, a holding cavity being provided at one end of the valve body, and a working interface and a normal-pressure interface being provided at the other end of the valve body; further comprising a lower trigger mechanism and an upper trigger mechanism, the lower trigger mechanism comprising a positive-pressure diaphragm and a lower moving assembly, the upper trigger mechanism comprising a negative-pressure diaphragm and an upper moving assembly; the inner cavity comprising a first normal-pressure cavity, a second normal-pressure cavity, a first negative-pressure cavity, a second negative-pressure cavity, a working cavity and a negative-pressure channel; the lower moving assembly is connected to the positive-pressure diaphragm, and moves up and down under the action of the positive-pressure diaphragm to connect or isolate the first negative-pressure cavity from the negative-pressure channel; the upper moving assembly is connected to the negative-pressure diaphragm, and moves up and down under the action of the negative-pressure diaphragm to selectively connect the working cavity to the second negative-pressure cavity or the normal-pressure interface; the present application realizes the opening and closing of a purely mechanical control vacuum interface valve, which can be used in a vacuum sewage discharge system, which not only reduces the installation cost, but also is very convenient to use and has high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a pilot-operated gas-controlled vacuum mechanical valve. Background Art

[0002] In traditional vacuum sewage systems, a riser or sump is installed at the sewage collection point. Domestic wastewater flows into the riser under the action of gravity. A vacuum interface valve is installed in the vacuum drainage pipe between the riser and the vacuum sewage tank. The riser is equipped with a liquid level sensor. When the liquid level sensor detects a high liquid level, it controls the solenoid valve to open the vacuum interface valve, and the wastewater in the riser is sucked into the vacuum sewage tank for storage. This solution requires electricity for the riser and the laying of cables, which is not only costly, but also voltage attenuation if the dispersed points are too far apart, affecting the stability of the entire system.

[0003] Chinese utility model patent publication number CN214889037U discloses a pneumatic vacuum level control valve. This control valve uses pneumatic pressure to drive a trigger mechanism, utilizing a mechanical structure to control the opening or closing of a vacuum interface valve. Control is entirely dependent on the water level within the lifter, eliminating the need for cabling, significantly reducing installation and operational costs, and avoiding voltage decay and system instability. However, this control valve connects or disconnects the working port and the negative pressure port by moving a magnetic bead up and down under the dual effects of magnetic force and air pressure, creating a positive or negative pressure in the working port, thereby controlling the closing or opening of the vacuum interface valve. However, the magnetic force of the magnetic bead is difficult to quantify, making it difficult to guarantee product quality during mass production. Summary of the Invention

[0004] In view of the defects in the prior art, the object of the present invention is to provide a pilot-operated air-controlled vacuum mechanical valve with easier product quality assurance.

[0005] The technical solution adopted in the present invention is:

[0006] A pilot-operated air-controlled vacuum mechanical valve comprises a valve body having an inner cavity, one end of the valve body being provided with a gas-holding cavity for connecting to a lifter, and the other end of the valve body being provided with a working interface for connecting to a vacuum interface valve and a normal pressure interface for connecting to a normal pressure source;

[0007] 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 component, the upper trigger mechanism includes a negative pressure diaphragm and an upper moving component; the inner cavity includes a first normal pressure cavity, a second normal pressure cavity, a first negative pressure cavity, a second negative pressure cavity, a working cavity and a negative pressure channel; the positive pressure diaphragm is installed in the inner cavity to separate the first normal pressure cavity and the air holding cavity, and the negative pressure diaphragm is installed in the inner cavity to separate the first negative pressure cavity and the second normal pressure cavity; the first normal pressure cavity and the second normal pressure cavity are connected to the normal pressure interface; one end of the second negative pressure cavity and the negative pressure channel are connected to the negative pressure source, and the other ends are isolated from each other; the working cavity is connected to the working interface; the first negative pressure cavity is connected to the normal pressure source through the air supplement hole;

[0008] The lower moving component is connected to the positive pressure diaphragm, and moves up and down under the action of the positive pressure diaphragm to connect or isolate the first negative pressure chamber from the negative pressure channel; the upper moving component is connected to the negative pressure diaphragm, and moves up and down under the action of the negative pressure diaphragm to selectively connect the working chamber to the second negative pressure chamber or the normal pressure interface.

[0009] Furthermore, the lower moving component 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 cavity, the pin is arranged on the inside of the positive pressure diaphragm, and one end of the pin 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 connect or isolate the first negative pressure cavity and the negative pressure channel.

[0010] Furthermore, the upper trigger mechanism also includes a spring, which is arranged in the first negative pressure chamber and has one end against the inner side of the negative pressure diaphragm.

[0011] Furthermore, the upper moving component 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 and is connected to the valve core; an annular sealing body is provided on the valve core, and the valve core moves up and down under the action of the negative pressure diaphragm and the spring so that the annular sealing body selectively seals between the working chamber and the second negative pressure chamber or between the working chamber and the normal pressure interface.

[0012] Furthermore, it also includes a guide ring, which is fixedly installed in the inner cavity. The lower end of the valve core passes through the guide ring and is connected to the screw. The working chamber is connected to the normal pressure interface through the guide ring. When the valve core moves downward, the annular sealing body seals on the guide ring to separate the working chamber from the normal pressure interface.

[0013] Furthermore, it also includes a regulator, and the air supply hole is connected to the normal pressure source through the regulator.

[0014] Further, the flow rate of the air supplement hole is less than that of the negative pressure channel.

[0015] 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. 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.

[0016] 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. The valve body is provided with a first negative pressure power interface communicating with the negative pressure channel. Both the first negative pressure power interface and the second negative pressure power interface are communicated with the negative pressure source.

[0017] Further, the breath-holding chamber is opened on the valve seat.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0019] 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 required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 Schematic structural diagram of the pilot-operated pneumatically controlled vacuum mechanical valve provided by the embodiment of the present application;

[0021] Figure 2 Schematic side-sectional structural diagram of the pilot-operated pneumatically controlled vacuum mechanical valve provided by the embodiment of the present application in the closed state;

[0022] Figure 3 Schematic front-sectional structural diagram of the pilot-operated pneumatically controlled vacuum mechanical valve provided by the embodiment of the present application in the closed state;

[0023] Figure 4 Schematic front-sectional structural diagram of the pilot-operated pneumatically controlled vacuum mechanical valve provided by the embodiment of the present application in the open state;

[0024] Figure 5 Schematic structural diagram of the valve body provided by the embodiment of the present application;

[0025] Figure 6 Schematic structural diagram of the guide ring provided by the embodiment of the present application.

[0026] Among them, the valve seat 1, the air-holding cavity 101, the valve body 2, the first negative pressure cavity 201, the air supplement hole 202, the first normal pressure cavity 203, the negative pressure channel 204, the connection hole 205, the positioning pin 206, the spring 3, the second lining plate 4, the valve cover 5, the second negative pressure cavity 501, the working interface 502, the working cavity 503, the second normal pressure cavity 504, the second negative pressure power interface 505, the normal pressure interface 506, the negative pressure diaphragm 6, the snap ring 7, the screw 8, the O-ring 9, the guide ring 10, the valve core 11, the regulator 12, the first lining plate 13, the positive pressure diaphragm 14, the pin 15, and the counterweight iron 16. Specific embodiments

[0027] The embodiments of the technical solution of the present invention will be described in detail below in conjunction with specific embodiments. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0028] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present invention belongs.

[0029] See Figures 1 to 6 , a pilot-operated pneumatically 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 provided with a working interface 502 for connecting with a vacuum interface valve and a normal pressure interface 506 for connecting with a normal pressure source.

[0030] The vacuum mechanical valve further includes a lower trigger mechanism and an upper trigger mechanism. The lower trigger mechanism includes a positive pressure diaphragm 14 and a lower moving component, and the upper trigger mechanism includes a negative pressure diaphragm 6 and an upper moving component; the inner cavity includes a first normal pressure cavity 203, a second normal pressure cavity 504, a first negative pressure cavity 201, a second negative pressure cavity 501, a working cavity 503, and a negative pressure channel 204; the positive pressure diaphragm 14 is installed in the inner cavity to separate the first normal pressure cavity 203 and the air-holding cavity 101, and the negative pressure diaphragm 6 is installed in the inner cavity to separate the first negative pressure cavity 201 and the second normal pressure cavity 504; the first normal pressure cavity 203 and the second normal pressure cavity 504 are communicated with the normal pressure interface 506; one end of the second negative pressure cavity 501 and the negative pressure channel 204 is connected to the negative pressure source, and the other ends are separated from each other; the working cavity 503 is communicated with the working interface 502; the first negative pressure cavity 201 is connected to the normal pressure source through the air supplement hole 202.

[0031] The lower moving component is connected to the positive pressure diaphragm 14 and moves up and down under the action of the positive pressure diaphragm 14 to connect or disconnect the first negative pressure chamber 201 and the negative pressure passage 204; the upper moving component is connected to the negative pressure diaphragm 6 and moves up and down under the action of the negative pressure diaphragm 6 to selectively connect the working chamber 503 to the second negative pressure chamber 501 or the normal pressure interface 506.

[0032] During use, the normal pressure interface 506 is connected to a normal pressure source, which can be the atmosphere. One end of the second negative pressure chamber 501 and the negative pressure passage 204 can be connected to a negative pressure source through a tee. The negative pressure source sucks air outwards to form a negative pressure state in the second negative pressure chamber 501 and the negative pressure passage 204. The holding chamber 101 is connected to the holding air pipe in the lifter, and the working interface 502 is connected to the vacuum section valve.

[0033] In this application, the holding chamber 101 is connected to the holding air pipe in the lifter. The pressure in the holding chamber 101 increases or decreases with the change of the liquid level in the lifter. Then, a negative pressure is provided by the negative pressure source and a normal pressure is provided by the normal pressure source. Through 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 passage 204 respectively arranged in the inner cavity, the positive pressure diaphragm 14 and the negative pressure diaphragm 6 are controlled to move up and down, thereby driving the lower moving component connected to the positive pressure diaphragm 14 and the upper moving component connected to the negative pressure diaphragm 6 to move up and down. As a result, the working chamber 503 is connected to the normal pressure interface 506 to be in a normal pressure state 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, realizing the pure mechanical control of the opening and closing of the vacuum interface valve. It can be used in a vacuum sewage system, without the need for electricity and cable laying, which not only reduces the installation cost, but also facilitates the standardization and quantification of product quality, is suitable for mass production, is very convenient to use, and has high reliability.

[0034] 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. The positive pressure diaphragm 14 is fixed between the valve seat 1 and the valve body 2, and the negative pressure diaphragm 6 is fixed between the valve cover 5 and the valve body 2.

[0035] The holding chamber 101 is opened on the valve seat 1. The holding chamber 101 is separated from the inner cavity of the valve body by the positive pressure diaphragm 14, and the holding chamber 101 is located outside the positive pressure diaphragm 14. The space on the valve seat 1 and inside the positive pressure diaphragm 14 forms the first normal pressure chamber 203 with the bottom space of the valve body 2. The space on the valve cover 5 and inside the negative pressure diaphragm 6 forms the first negative pressure chamber 201 with the top space of the valve body 2.

[0036] The valve body 2 is disc-shaped. Positioning pins 206 for easy installation are provided on both the upper and lower parts of the valve body 2. The upper and lower sides of the valve body 2 are respectively connected to the corresponding valve cover 5 and valve seat 1 through the positioning pins 206. A central hole is vertically opened along the center of the valve body 2. This central hole is a through hole, with its lower end communicating with the first normal pressure chamber 203 and its upper end communicating with the first negative pressure chamber 201. A negative pressure channel 204 is opened on the valve body 2. It is arranged radially along the valve body 2, with one end extending 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 communicating with the central hole, so as to communicate with the first negative pressure channel 204 through the central hole. A downward moving mechanism is arranged in the central hole. Its upper end extends into the first negative pressure chamber 201. Through the up and down movement of the downward moving mechanism, the negative pressure channel 204 is connected or disconnected from the first negative pressure chamber 201. The lower end of the downward moving mechanism passes through the central hole and the positive pressure diaphragm 14 and extends into the breath-holding chamber 101. Its lower end is always blocked in the central hole, cutting off the connection between the negative pressure channel 204 and the first normal pressure chamber 203, so that the negative pressure channel 204 is not connected to the first normal pressure chamber 203.

[0037] The downward moving assembly includes a pin 15 and a counterweight 16. The counterweight 16 is arranged outside the positive pressure diaphragm 14 and is located in the breath-holding chamber 101. The pin 15 is arranged inside the positive pressure diaphragm 14, and one end of it passes through the positive pressure diaphragm 14 and is connected to the counterweight 16. The pin 15 moves in the inner cavity under the action of the positive pressure diaphragm 14 and the counterweight 16 to connect or disconnect the first negative pressure chamber 201 from the negative pressure channel 204.

[0038] Specifically, the pin 15 is a cylindrical pin 15 with a frustum. Its frustum is located in the first negative pressure chamber 201. The lower end passes through the central hole of the valve body 2 and the positive pressure diaphragm 14 from top to bottom, and is connected to the counterweight 16 arranged in the breath-holding chamber 101 at the center of the valve seat 1 through a thread. The inner diameter of the upper section of the central hole is larger than that of its lower section. The upper section of the central hole corresponds to the negative pressure channel 204, so that the cylindrical rod of the pin 15 blocks the lower end of the central hole, cutting off the connection between the negative pressure channel 204 and the first normal pressure chamber 203. The up and down movement of the frustum of the pin 15 opens or blocks the upper section of the central hole, thereby connecting or disconnecting the negative pressure channel 204 from the first negative pressure chamber 201.

[0039] 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 communicates with the atmosphere, and supplements air to the first negative pressure chamber 201 through the air supply hole 202. The flow rate of the air supply hole 202 is smaller than that of the negative pressure channel 204. When the first negative pressure chamber 201 is connected to the negative pressure channel 204, the suction speed of the negative pressure channel 204 is greater than the air supply speed of the air supply hole 202, so that the first negative pressure chamber 201 can be in a negative pressure state due to being evacuated.

[0040] The upper triggering mechanism further includes a spring 3, which is arranged in the first negative pressure chamber 201, and one end of the spring 3 abuts against the inner side of the negative pressure diaphragm 6.

[0041] An installation groove is provided in the middle 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 in a negative pressure state, the negative pressure diaphragm 6 is subjected to a downward negative pressure, and the spring 3 is compressed; when the first negative pressure chamber 201 is slowly filled with air to normal pressure under the action of the air supplement hole 202, the negative pressure diaphragm 6 bulges upward under the restoring force of the spring 3.

[0042] The valve cover 5 is in the shape of an inverted funnel, smaller at the top and larger at the bottom. The second negative pressure chamber 501 is located at the top of the valve cover 5, and the working chamber 503 is located in the middle of the valve cover 5. The valve cover 5 is provided with a second negative pressure power interface 505, a working interface 502, and a normal pressure interface 506 that communicate with the inner cavity of the valve cover 5 from top to bottom. The second negative pressure power interface 505 communicates with the second negative pressure chamber 501, the working interface 502 communicates with the working chamber 503, the normal pressure interface 506 can communicate with the working chamber 503 horizontally and communicate with the second normal pressure chamber 504 vertically. The first normal pressure chamber 203 communicates with the second normal pressure chamber 504 through a connection hole 205 provided at the edge of the valve body 2. The inner diameter of the second negative pressure chamber 501 is smaller than the inner diameter of the working chamber 503, so that there is a step between the second negative pressure chamber 501 and the working chamber 503.

[0043] The upper moving assembly includes a valve core 11 and a screw 8. The valve core 11 is arranged on the outer side of the negative pressure diaphragm 6, and the screw 8 is arranged on the inner side of the negative pressure diaphragm 6, and one end of the screw 8 passes through the negative pressure diaphragm 6 and is connected to the valve core 11; a ring-shaped seal is provided on the valve core 11. The valve core 11 moves up and down under the action of the negative pressure diaphragm 6 and the spring 3 so that the ring-shaped seal selectively seals 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 selectively communicates with the normal pressure interface 506 to be in a normal pressure state or communicates with the second negative pressure chamber 501 to be in a negative pressure state, thereby driving the vacuum interface valve to close or open.

[0044] To facilitate the installation of the upper moving assembly and the lower moving assembly, a first lining plate 13 is provided on the inner side of the positive pressure diaphragm 14, and a second lining plate 4 is provided on the inner side of the negative pressure diaphragm 6. The lower end of the pin 15 passes through the first lining plate 13 and the positive pressure diaphragm 14 in sequence and is connected to the counterweight iron 16. The upper end of the screw 8 passes through the second lining plate 4 and the negative pressure diaphragm 6 in sequence and is threadedly connected to the valve core 11.

[0045] To facilitate the annular seal of the valve core 11 between the working chamber 503 and the atmospheric pressure interface 506, a guide ring 10 is further included. The guide ring 10 is a slotted guide ring 10, with a central through-hole vertically opened along the guide ring 10, and through-holes circumferentially spaced along the guide ring 10. The through-holes communicate with the atmospheric pressure interface 506. The guide ring 10 is fixedly installed in the inner cavity by a snap ring 7. An O-ring seal 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 valve cover 5 to seal the gap between the upper end of the guide ring 10 and the inner cavity of the valve cover 5. The lower end of the valve core 11 passes through the guide ring 10 and is connected to a screw 8. A plurality of protrusions are circumferentially provided 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 valve core 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 this gap, and thus communicates with the atmospheric pressure interface 506. When the valve core 11 moves downward, the annular seal of the valve core 11 seals at the top of the guide ring 10, thereby blocking the communication between the working chamber 503 and the atmospheric pressure interface 506. When the valve core 11 moves upward, the annular seal of the valve core 11 seals on the step at the top of the valve cover 5, thereby blocking the communication between the working chamber 503 and the second negative pressure chamber 501.

[0046] The principle of controlling the opening and closing of the vacuum interface valve by the vacuum mechanical valve in this application is as follows:

[0047] The gas pressure in the airtight 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 airtight chamber 101 is not high. When the upward pressure exerted on the pin 15 through the positive pressure diaphragm 14 is less than the sum of the downward gravity of the counterweight 16 and the downward suction force of the negative pressure in the negative pressure passage 204 on the pin 15, the pin 15 moves downward to the bottom in the inner cavity. The frustum on the pin 15 blocks the communication between the negative pressure passage 204 and the first negative pressure chamber 201. At this time, the first negative pressure chamber 201 slowly intakes air through the air supply hole 202, and the first negative pressure chamber 201 becomes atmospheric pressure. The negative pressure diaphragm 6 bulges upward under the upward restoring force of the spring 3 and drives the valve core 11 to move vertically upward to the top of the inner cavity of the valve cover 5. The annular seal on the valve core 11 forms a sealing surface with the step at the top of the valve cover 5, blocking the communication between the working chamber 503 and 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 seal, and the working chamber 503 communicates with the atmospheric pressure interface 506 through the guide ring 10. The working chamber 503 is at atmospheric pressure, and the vacuum interface valve resets and closes.

[0048] When the liquid level in the elevator gradually rises, the gas pressure in the airtight chamber 101 also rises accordingly. When the upward pressure of the gas in the airtight chamber 101 acting on the pin 15 through the positive pressure diaphragm 14 is greater than the sum of the downward gravity of the counterweight 16 and the downward suction force of the negative pressure in the negative pressure channel 204 on the pin 15, the positive pressure diaphragm 14 bulges upward, and the pin 15 and the counterweight 16 move upward under the action of the positive pressure diaphragm 14. The frustum of the pin 15 leaves the upper end of the central hole, so that the negative pressure channel 204 is communicated with the first negative pressure chamber 201, and the gas in the first negative pressure chamber 201 is sucked out. Since the flow rate of the air supplement hole 202 is less than that of the negative pressure channel 204, the air supplement speed of the air supplement hole 202 is less than the suction speed of the negative pressure channel 204. As the gas in the first negative pressure chamber 201 is sucked out, the first negative pressure chamber 201 becomes negative pressure. When the negative pressure acting on the negative pressure diaphragm 6 downward is greater than the upward elastic force of the spring 3 acting on it, the negative pressure diaphragm 6 drives the valve core 11 to move vertically downward until the annular seal of the valve core 11 forms a sealing surface with the top of the guide ring 10, cutting off the working chamber 503 from 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 seal ring, and the second negative pressure chamber 501 is communicated with the working chamber 503. Under the suction action of the second negative pressure power interface 505, the working chamber 503 is in negative pressure, and the vacuum interface valve is opened under the negative pressure action.

[0049] In this application, unless otherwise clearly specified 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 integrated; it can be an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0050] In the description of the present invention, a large number of specific details are set forth. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, systems, and technologies have not been shown in detail so as not to obscure the understanding of this specification.

[0051] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, systems, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, systems, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit 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 they can still 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 cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the specification of the present invention.

Claims

1. A pilot-operated pneumatically controlled vacuum mechanical valve, comprising a valve body with an inner cavity. One end of the valve body is provided with a suffocating cavity for connecting with a lifter, and the other end of the valve body is provided with a working interface for connecting with a vacuum interface valve and a normal pressure interface for connecting with a normal pressure source; characterized in that, it further comprises a lower triggering mechanism and an upper triggering mechanism. The lower triggering mechanism includes a positive pressure diaphragm and a lower moving assembly, and the upper triggering mechanism includes a negative pressure diaphragm and an upper moving assembly; the inner cavity includes a first normal pressure cavity, a second normal pressure cavity, a first negative pressure cavity, a second negative pressure cavity, a working cavity and a negative pressure channel; the positive pressure diaphragm is installed in the inner cavity to separate the first normal pressure cavity and the suffocating cavity, and the negative pressure diaphragm is installed in the inner cavity to separate the first negative pressure cavity and the second normal pressure cavity; the first normal pressure cavity and the second normal pressure cavity are communicated with the normal pressure interface; one end of the second negative pressure cavity and one end of the negative pressure channel are both connected to a negative pressure source, and the other ends are separated from each other; the working cavity is communicated with the working interface; the first negative pressure cavity is connected to the normal pressure source through an air compensation hole; the lower moving assembly is connected to the positive pressure diaphragm and moves up and down under the action of the positive pressure diaphragm to connect or separate the first negative pressure cavity and the negative pressure channel; the upper moving assembly is connected to the negative pressure diaphragm and moves up and down under the action of the negative pressure diaphragm to selectively connect the working cavity with the second negative pressure cavity or the normal pressure interface; the lower moving assembly includes a pin and a counterweight. The counterweight is arranged outside the positive pressure diaphragm and located in the suffocating cavity. The pin is arranged inside the positive pressure diaphragm, and one end of the pin passes through the positive pressure diaphragm and is connected to the counterweight. The pin moves in the inner cavity under the action of the positive pressure diaphragm and the counterweight to connect or separate the first negative pressure cavity and the negative pressure channel; the upper triggering mechanism further includes a spring. The upper moving assembly includes a valve core and a screw. The valve core is arranged outside the negative pressure diaphragm, and the screw is arranged inside the negative pressure diaphragm, and one end of the screw passes through the negative pressure diaphragm and is connected to the valve core; a ring-shaped seal is provided on the valve core. The valve core moves up and down under the action of the negative pressure diaphragm and the spring to selectively seal the ring-shaped seal between the working cavity and the second negative pressure cavity or between the working cavity and the normal pressure interface.

2. The pilot-operated pneumatically controlled vacuum mechanical valve according to claim 1, characterized in that, The spring is arranged in the first negative pressure cavity, and one end of the spring abuts against the inner side of the negative pressure diaphragm.

3. The pilot-operated pneumatically controlled vacuum mechanical valve according to claim 1, characterized in that It further 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 to the screw. The working cavity is communicated with the normal pressure interface through the guide ring. When the valve core moves downward, the ring-shaped seal seals on the guide ring to separate the working cavity and the normal pressure interface.

4. The pilot-operated pneumatically controlled vacuum mechanical valve according to claim 1, wherein It further includes a regulator. The air compensation hole is connected to the normal pressure source through the regulator.

5. The pilot-operated pneumatically controlled vacuum mechanical valve according to claim 1, characterized in that, The flow rate of the air compensation hole is less than the flow rate of the negative pressure channel.

6. The pilot-operated pneumatically controlled vacuum mechanical valve according to any one of claims 1 to 5, characterized in that, 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. 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.

7. The pilot-operated pneumatically controlled vacuum mechanical valve according to claim 6, wherein 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. The valve body is provided with a first negative pressure power interface communicating with the negative pressure channel. Both the first negative pressure power interface and the second negative pressure power interface are communicated with the negative pressure source.

8. The pilot-operated pneumatically controlled vacuum mechanical valve according to claim 6, characterized in that, The breath-holding chamber is opened on the valve seat.

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