Negative Pressure Trigger Converter and Vacuum Valve Control System

Abstract

The present invention discloses a negative-pressure trigger converter and a vacuum valve control system. The converter includes a first air chamber group and a trigger mechanism. The end of the trigger mechanism is connected to the first air chamber group. A switching mechanism is provided in the first air chamber group. The action of the trigger mechanism can drive the switching mechanism in the first air chamber group to act to control the opening and closing of the vacuum valve. The vacuum valve control system includes a converter and a vacuum valve. The converter is connected to the vacuum valve to control the opening and closing of the vacuum valve. The present invention provides a negative-pressure trigger converter vacuum valve control system, which does not require electricity and only realizes gas pressure drive by generating a pressure difference due to the change of the water level in the well, so as to achieve the purpose of controlling the opening and closing of the vacuum valve.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment equipment, and particularly relates to a negative pressure trigger converter and a vacuum valve control system having the converter. Background Art

[0002] In a vacuum conveying system, a vacuum valve is a key device for collecting access, and a converter is a key detection and control device on which the vacuum valve depends for operation. With the increasing demand for vacuum conveying, the vacuum valve converter will become a hot spot for technology development and application in the conveying system.

[0003] The actuation of the vacuum valve in the vacuum negative pressure well is related to the operation of the overall vacuum system. The most traditional and simple way is to use an electromagnetic valve to drive the vacuum valve to open and close electrically. Therefore, special power transmission lines for each well must be laid between each vacuum well and the vacuum station. This is acceptable when laying collection points (wells) in a small indoor building, but when setting up vacuum pumping points in a large area (with a diameter of 3 - 5 kilometers) in an outdoor area, problems such as laying and burying a large number of power cables will occur. For this reason, those skilled in the art have actively created a method that does not require electricity and only uses the air pressure difference generated by the change in the water level in the well to achieve gas pressure drive and thus control the opening and closing of the vacuum valve. Summary of the Invention

[0004] The main technical problem solved by the present invention is to provide a negative pressure trigger converter and a vacuum valve control system having the converter, which do not require electricity and only use the air pressure difference generated by the change in the water level in the well to achieve gas pressure drive and thus control the opening and closing of the vacuum valve.

[0005] To solve the above technical problem, a technical solution adopted by the present invention is:

[0006] The present invention provides a negative pressure trigger converter, which is connected to a vacuum valve and used to control the opening and closing of the vacuum valve. It includes a first air chamber group and a trigger mechanism. The trigger mechanism is connected to the first air chamber group. A switching mechanism is provided in the first air chamber group. The action of the trigger mechanism can drive a change in the air pressure in the first air chamber group, and the change in the air pressure in the first air chamber group can drive the switching mechanism to act to control the opening and closing of the vacuum valve.

[0007] Further, the trigger mechanism is arranged in a second air chamber group, and the change in the air pressure in the second air chamber group can drive the trigger mechanism to perform a linear reciprocating motion.

[0008] Furthermore, the second air chamber group is communicated with the liquid level, and the change in the air pressure in the second air chamber group changes with the change in the liquid level of the liquid surface.

[0009] Furthermore, the switching mechanism includes a first diaphragm and a first sliding shaft. The first diaphragm is disposed in the first air chamber group. One end of the first sliding shaft is connected to the first diaphragm. The actuation of the triggering mechanism causes a change in the air pressure in the first air chamber group, thereby driving the first diaphragm to deform and generate a displacement to drive the first sliding shaft to move synchronously. The other end of the first sliding shaft performs a linear reciprocating motion between an open position for controlling the opening of the vacuum valve and a closed position for controlling the closing of the vacuum valve.

[0010] Furthermore, the switching mechanism further includes a first spring. The first spring is connected to the first diaphragm and is located on both sides of the first diaphragm with respect to the first sliding shaft. When the first diaphragm deforms and generates a displacement, it can compress the first spring and recover its deformation under the action of the first spring.

[0011] Furthermore, the first air chamber group includes a plurality of gas channels, and the plurality of gas channels are respectively connected to vacuum and atmospheric pressure.

[0012] Furthermore, the triggering mechanism includes a second diaphragm and a second sliding shaft. The second diaphragm is disposed in the second air chamber group. One end of the second sliding shaft is connected to the second diaphragm, and the other end is connected to the first air chamber group. A change in the air pressure in the second air chamber group can drive the second diaphragm to deform and generate a displacement, and when the second diaphragm deforms and generates a displacement, it can drive the second sliding shaft to move synchronously.

[0013] Furthermore, the triggering mechanism further includes a second spring. The second spring is disposed in the second air chamber group and is sleeved on the outer periphery of the second sliding shaft. When the second diaphragm deforms and generates a displacement, it can compress the second spring and recover its deformation under the action of the second spring.

[0014] The present invention also provides a vacuum valve control system having the above-mentioned negative pressure triggering converter, including a converter and a vacuum valve. The converter is connected to the vacuum valve to control the opening and closing of the vacuum valve.

[0015] Furthermore, the vacuum valve includes an upper housing, a lower housing, and a third diaphragm. The third diaphragm is clamped between the upper housing and the lower housing, so that the upper housing and the lower housing are sealed by the third diaphragm and do not communicate with each other; the third diaphragm is a flat rubber membrane.

[0016] The beneficial effects of the present invention are:

[0017] 1. The converter in the present invention is designed with a first air chamber group, a second air chamber group, and a trigger mechanism connecting the first and second air chamber groups. The second air chamber group is connected to the liquid level in the vacuum well. The trigger mechanism in the second air chamber group is used to drive the switching mechanism in the first air chamber group to act. Only by the air pressure thrust caused by the rising liquid level in the vacuum well can the air pressure switching at the output end of the converter (the connection end with the vacuum valve) be realized to drive the opening and closing of the vacuum valve. By using a small amount of gas to drive the trigger mechanism to act and introducing a large amount of gas to drive the switching mechanism in the first air chamber group, the opening and closing of the vacuum valve for the real target can be realized. The structure is delicate and the design is reasonable. The whole process only uses the change of physical gas pressure difference to drive the conversion for the opening and closing of the vacuum valve, without using electricity (battery, solar energy), saving the operation cost and having strong practicability.

[0018] 2. The valve plate traction shaft of the vacuum valve is made of stainless steel. Stainless steel has the advantages of high strength, high temperature tolerance, and high corrosion resistance, solving the problems of poor high temperature tolerance (must be lower than 70°C), excessive expansion and deformation of the original plastic shaft, and the problem that the valve plate is not easy to close due to excessive sliding friction of the shaft caused by the deformation of the valve plate traction shaft.

[0019] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present invention and combines with the drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of Embodiment 1;

[0021] Figure 2 It is a schematic structure of Embodiment 2 Figure 1 (Vacuum valve open state);

[0022] Figure 3 It is a schematic structure of Embodiment 2 Figure 2 (Vacuum valve closed state);

[0023] Figure 4 It is a schematic structural diagram of the vacuum valve in Embodiment 2 (valve plate closed state);

[0024] The marks of each part in the drawings are as follows:

[0025] Converter 1, first diaphragm 11, second sliding shaft 12, first spring 13, second diaphragm 14, second sliding shaft 15, second spring 16, micro-adjustment hole 17, air chamber A1, air chamber A2, air chamber A3, air chamber A4, air chamber A5, air chamber A6, air chamber A7, vacuum channel A, vacuum channel B, atmosphere channel C;

[0026] Vacuum valve 2, upper housing 21, upper ventilation port 211, lower housing 22, lower ventilation port 221, valve port 23, third spring 24, third diaphragm 25, valve plate mechanism 26, valve plate traction shaft 261, valve plate 262;

[0027] Liquid level detection tube 3;

[0028] High liquid level W1, low liquid level W0. Specific implementation mode

[0029] The specific implementation mode of the present invention is illustrated below through specific specific embodiments. Those skilled in the art can easily understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented in other different ways, that is, without departing from the scope disclosed by the present invention, different modifications and changes can be made.

[0030] Embodiment 1: A negative pressure trigger converter is connected to a vacuum valve and is used to control the opening and closing of the vacuum valve. The converter 1 includes a first air chamber group and a trigger mechanism. The trigger mechanism is arranged outside the first air chamber group and its end is connected to the first air chamber group. A switching mechanism is arranged in the first air chamber group. The trigger mechanism makes a linear reciprocating motion and can drive the switching mechanism in the first air chamber group to act to control the opening and closing of the vacuum valve.

[0031] The specific way for the trigger mechanism to drive the switching mechanism in the first air chamber group to act can be: The trigger mechanism includes a second driving shaft, and mechanically drive or manually drive the second sliding shaft to make a linear reciprocating motion to drive the switching mechanism in the first air chamber group to act to control the opening and closing of the vacuum valve.

[0032] The specific way for the trigger mechanism to drive the switching mechanism in the first air chamber group to act can also be: The trigger mechanism includes a second diaphragm 14 and a second sliding shaft 15. The second diaphragm is arranged in the second air chamber group. One end of the second sliding shaft is connected to the second diaphragm, and the other end is connected to the second air chamber group. The air pressure change in the second air chamber group drives the second diaphragm to deform and generate displacement. When the second diaphragm deforms and generates displacement, it can drive the second sliding shaft to move synchronously. The second sliding shaft makes a linear reciprocating motion and can drive the switching mechanism in the first air chamber group to act to control the opening and closing of the vacuum valve.

[0033] The second air chamber group is communicated with the liquid level, and the air pressure in the second air chamber group changes with the change of the liquid level height of the liquid level.

[0034] Specifically, such as Figure 1As shown, the second air chamber group includes air chambers (A1, A2). The air chamber A1 is connected to the liquid level in the well, and the air chamber A2 is connected to the atmosphere. The second diaphragm is disposed between the air chambers A1 and A2 and prevents the air in the two chambers from communicating with each other. The second sliding shaft is disposed in the air chamber A2, and its end passes through the air chamber A2 (the second sliding shaft is in sealed movement with the air chamber A2, and a rubber sealing ring is used for sealing to ensure that gas will not leak due to the movement of the second sliding shaft) and is located in the first air chamber group.

[0035] When the liquid level in the well rises, it will squeeze the existing air layer in the liquid level detection tube, causing the air pressure in the air layer to continuously increase. This increased air pressure is transmitted to the air chamber A1 through the micro-connecting tube. The continuously compressed air will accumulate in the air chamber A1 and continuously exert force on the second diaphragm, causing the second diaphragm to deform and generate a downward displacement, and the second diaphragm drives the second sliding shaft to move downward.

[0036] To ensure that the deformation of the second diaphragm is controlled and the deformation distance can be effectively transmitted, a second spring 16 is provided in the air chamber A2. The second spring is disposed in the air chamber A2 and coaxially disposed on the outer periphery of the second sliding shaft. When the second diaphragm deforms and displaces towards the first air chamber group, the second spring is used to absorb the thrust of the deformation of the second diaphragm. When the second diaphragm recovers from the deformation, the rebounding force of the second spring gives a thrust to the second diaphragm for deformation recovery.

[0037] The switching mechanism includes a first diaphragm 11 and a first sliding shaft 12. The first diaphragm is disposed in the second air chamber group. One end of the first sliding shaft is connected to the first diaphragm, and the other end is connected to the output end of the first air chamber group. The action of the triggering mechanism causes a change in the air pressure in the first air chamber group, thereby driving the first diaphragm to deform and generate a displacement to drive the first sliding shaft to move synchronously, and further realizing the air pressure switching at the output end of the second air chamber group.

[0038] Specifically, as Figure 1 shown, the first air chamber group includes air chambers (A3, A4, A5, A6, A7). The air chambers A4 and A5 are connected to the atmosphere, and the air chamber A7 is connected to a vacuum source. The first diaphragm is disposed between the air chambers A3 and A4 and prevents the air in the two chambers from communicating with each other. The first spring 13 is disposed in the air chamber A3. The first sliding shaft is disposed in the air chamber A4 and is connected to the first diaphragm, and its end passes through the air chamber A5 and is located in the air chamber A6. The air chamber A3 is provided with a vacuum channel A connecting to the vacuum source. There is an atmosphere channel C connecting the two air chambers between the air chambers A5 and A6, and there is a vacuum channel B connecting the two air chambers between the air chambers A6 and A7.

[0039] In the normal state, the end of the second sliding shaft is located in the air chamber A3 and seals the vacuum passage A, and the end of the first sliding shaft is located in the air chamber A6 and seals the vacuum passage B. The air chamber A5 and the air chamber A6 communicate at the atmosphere passage C. At this time, the air chamber A6 is in the atmosphere state.

[0040] As the liquid level in the well rises, the second diaphragm is deformed and displaced under the extrusion of the gas in the air chamber A1 and drives the second sliding shaft to move inside the air chamber A3 at the same time. The end of the second sliding shaft gradually separates from the vacuum passage A, and the vacuum gradually enters the air chamber A3 from the vacuum passage A. The air chamber A3 is transformed into a vacuum negative pressure state. To prevent the second sliding shaft from separating from the vacuum passage A quickly and introducing vacuum gas as soon as it moves, a sealed conical convex plug is provided on the second sliding shaft to block the vacuum passage A. Only when the second sliding shaft is displaced to a certain extent will the plug be completely separated from the vacuum passage A.

[0041] The air chamber A3 is transformed into a vacuum negative pressure state. Since the air chamber A4 is in the atmosphere state, the first diaphragm deforms and displaces towards the inside of the air chamber A3 and drives the first sliding shaft to displace synchronously. The first sliding shaft separates from the vacuum passage B, and the vacuum passage B is opened. The vacuum in the air chamber A7 enters the air chamber A6. At the same time, the first sliding shaft is displaced to block the atmosphere passage C. At this time, the air chamber A6 is in the vacuum state.

[0042] When the vacuum passage B is opened and the atmosphere passage C is closed, the vacuum in the air chamber A7 is introduced into the air chamber A6, and the air chamber A6 is connected to the vacuum valve. At this time, the converter can control the opening of the vacuum valve, and the first sliding shaft is located at the atmosphere passage C at this time, and this position is the opening position for controlling the opening of the vacuum valve; when the vacuum passage B is closed and the atmosphere passage C is opened, the atmosphere in the air chamber A5 is introduced into the air chamber A6, and the air chamber A6 is connected to the vacuum valve. At this time, the converter can control the closing of the vacuum valve, and the first sliding shaft is located at the vacuum passage B at this time, and this position is the closing position for controlling the opening of the vacuum valve; therefore, the air pressure change in the first air chamber group can drive the first diaphragm to deform and generate displacement to drive the first sliding shaft to move synchronously, and the other end of the first sliding shaft makes a linear reciprocating motion between the opening position for controlling the opening of the vacuum valve and the closing position for controlling the closing of the vacuum valve.

[0043] To ensure that the deformation of the first diaphragm is controlled and the deformation distance can be effectively transmitted, a first spring 13 is provided in the air chamber A3. The first spring is arranged in the air chamber A3. When the first diaphragm deforms and displaces towards the air chamber A3, the first spring is used to absorb the thrust of the deformation of the first diaphragm. When the first diaphragm recovers from the deformation, the first spring's rebounding force gives the first diaphragm a thrust for deformation recovery.

[0044] More specifically, as Figure 1As shown, the air chamber A3 has a fine adjustment hole 17 communicating with the atmosphere. The fine adjustment hole is used to continuously supplement the atmosphere to the air chamber A3, so that the third air chamber gradually changes to the atmospheric pressure state. It should be noted that the fine adjustment hole also continuously supplements a small amount of atmosphere during the process of the air chamber A3 changing to a vacuum state. Since this small amount of atmosphere is continuously sucked and processed by the vacuum gas, compared with the amount of vacuum gas entering this air chamber, the atmosphere introduced through the fine adjustment hole is very small and does not affect the conversion of the air chamber to a vacuum state.

[0045] The vacuum channels (A, B) and the atmosphere channel C are all rubber interfaces with good sealing performance and will not cause gas leakage.

[0046] To ensure that the vacuum channel B and the atmosphere channel C can accurately dock each time the first slide makes a reciprocating movement and can absorb the displacement deviation generated during the operation of the first slide shaft, for this purpose, a sealed conical convex plug that cooperates with the vacuum channel B and the atmosphere channel C is provided on the first slide shaft to block the vacuum channel B and the atmosphere channel C respectively.

[0047] This embodiment is designed with a first air chamber group and a second air chamber group. The switching mechanism in the first air chamber group is driven by the triggering mechanism in the second air chamber group. Only by the air pressure thrust of the rising liquid level in the vacuum well can the air pressure switching at the output end (the connection end with the vacuum valve) of this converter be realized to drive the opening and closing of the vacuum valve.

[0048] Both the first diaphragm and the second diaphragm are flat rubber membranes.

[0049] In this embodiment, after the air chamber A3 is introduced with negative pressure, it drives the switching mechanism to act, so it is named a negative pressure trigger converter.

[0050] The operation process of this embodiment is as follows:

[0051] Drive the vacuum valve to open:

[0052] When the accumulated water level in the vacuum well reaches the high liquid level, the gas in the liquid level detection tube in the vacuum well is compressed due to the rising liquid level in the vacuum well. The compressed gas is transmitted to the upper interface of the negative pressure trigger converter and enters the air chamber A1. When the water level in the vacuum well reaches the high liquid level W1, the compressed gas also reaches the highest peak in the air chamber A1 and generates the maximum pressure to cause the deformation of the transmission diaphragm. The pressure difference between the air chamber A2 and the air chamber A1 causes the second diaphragm to deform and displace, and drives the second sliding shaft to displace synchronously. The second sliding shaft gradually disengages from the vacuum channel A. The vacuum channel A introduces a small amount of vacuum gas into the air chamber A3 and quickly fills the third air chamber. Since the air chamber A4 is connected to the atmosphere and maintains the atmospheric pressure state, the pressure difference between the air chamber A3 and the air chamber A4 causes the first diaphragm to deform and displace, and drives the first sliding shaft to displace synchronously. The first sliding shaft blocks the atmosphere channel C to prevent the atmosphere in the air chamber A5 from entering the air chamber A6. At the same time, the vacuum channel B is opened, and the vacuum gas in the air chamber A7 is introduced into the air chamber A6. The air chamber A6 is transformed into a vacuum negative pressure state, and the air chamber A6 is connected to the vacuum valve, so that the opening of the vacuum valve can be realized.

[0053] Drive the vacuum valve to close:

[0054] When the water level in the vacuum well is at the low liquid level W0, the gas space in the liquid level detection tube in the vacuum well becomes larger and the gas pressure becomes smaller. The pressure difference between the air chambers A1 and A2 in the second air chamber group where the negative pressure trigger converter is connected to the liquid level becomes smaller. The deformation of the second diaphragm recovers and tends to be flat. At the same time, under the combined action of the reaction force of the second spring, the second sliding shaft is driven to move back. The second sliding shaft gradually returns to its original position and blocks the vacuum channel A, blocking the entry of vacuum gas into the air chamber A3. Since the air chamber A3 has a fine adjustment hole, it will continuously supplement the atmosphere into the air chamber A3, causing the air chamber A3 to gradually transform into the atmospheric pressure state. It should be noted that this fine adjustment hole also continuously supplements a small amount of atmosphere during the process of the air chamber A3 converting to vacuum, but this small amount of atmosphere is continuously sucked and processed by the vacuum gas. Compared with the amount of vacuum gas entering this air chamber, the atmosphere introduced by the fine adjustment hole is very small and does not affect the conversion of the air chamber A3 into the vacuum state. After the air chamber A3 is converted into the atmospheric state, there will also be no pressure difference with the air chamber A4. The first diaphragm will gradually tend to be flat as the air chamber A3 returns to the atmospheric state, and at the same time drive the first sliding shaft to move synchronously. The first sliding shaft returns to its original position and blocks the vacuum channel B to cut off the vacuum supply, and at the same time opens the atmosphere channel C to allow the atmosphere in the air chamber A5 to supplement into the air chamber A6. After the air chamber A6 is gradually transformed into the atmospheric state, the air chamber A6 is connected to the vacuum valve, so that the closing of the vacuum valve can be realized.

[0055] Embodiment 2: A vacuum valve control system having the negative pressure trigger converter described in Embodiment 1, as Figures 2 - 3 shown, includes a converter 1 and a vacuum valve 2, and the converter is connected to the vacuum valve to control the opening and closing of the vacuum valve.

[0056] As shown Figure 4 in FIG. Figure 4 , the vacuum valve 2 includes an upper housing 21, a lower housing 22, and a third diaphragm 25. The upper housing has an upper vent port 211, and the lower housing has a lower vent port 221. The third diaphragm is clamped between the upper housing and the lower housing, so that the space between the upper housing and the lower housing is sealed by the third diaphragm and they are not ventilated to each other; the third diaphragm is a flat rubber film.

[0057] As shown Figure 4 in FIG. Figure 4 , in this embodiment, a third spring 24 is provided in the upper housing. The third spring is connected to the third diaphragm. The valve plate mechanism is provided in the lower housing and is connected to the third diaphragm. When the upper vent port is connected to a vacuum and the lower vent port is connected to the atmospheric pressure, the third diaphragm deforms, driving the valve plate mechanism to displace upward toward the upper housing and compressing the third spring. At this time, the opening of the vacuum valve is realized; when the lower vent port is connected to a vacuum and the upper vent port is connected to the atmospheric pressure, the air pressure difference between the upper and lower housings and the compression force of the third spring will jointly cause the third diaphragm to gradually recover its deformation. The elastic force of the third diaphragm and the acting force of the third spring jointly drive the valve plate mechanism to move toward the valve port 23, thus realizing the closing of the vacuum valve.

[0058] Specifically, as shown Figure 4 in FIG. Figure 4 , the valve plate mechanism 26 includes a valve plate traction shaft 261 and a valve plate 262. One end of the valve plate traction shaft is connected to the third diaphragm, and the other end is connected to the valve plate. The valve plate traction shaft drives the valve plate to move with the deformation and displacement of the third diaphragm. Due to the air pressure change above and below the third diaphragm, the third diaphragm undergoes a large up-and-down deformation movement. The deformation movement distance of the third diaphragm often represents the opening and closing stroke distance of the lower valve plate mechanism.

[0059] In this embodiment, in order to make the valve plate closely fit the inner wall of the lower housing, a layer of rubber is coated on the outside of the valve plate. This rubber coating type can be full rubber coating of the valve plate body, or partial rubber coating with rubber embedded at the joint of the valve plate and the pipeline. In this way, the micro-deformation of the rubber can improve the tightness of the contact points.

[0060] In this embodiment, considering the tightness of the joint point between the valve plate mechanism and the pipeline, the valve plate mechanism is inclined, that is, the stroke direction of the valve plate traction shaft has an included angle with the water flow direction. The included angle is 20 - 75°, and the valve plate traction shaft is perpendicular to the valve port.

[0061] In this embodiment, the valve plate traction shaft is made of stainless steel material. The stainless steel material has the advantages of high strength, high temperature tolerance, and high corrosion resistance, solving the problems of poor high temperature tolerance (must be lower than 70°C), excessive expansion and deformation of the original plastic shaft, and the problem that the valve plate is not easy to close due to excessive sliding friction caused by the deformation of the valve plate traction shaft.

[0062] In this embodiment, the upper housing and the lower housing of the vacuum valve can be made of stainless steel, metal, alloy, or various plastics (such as PVC, PE, PP, fiberglass, or PA, etc.).

[0063] In this embodiment, since the deformation displacement of the third diaphragm often represents the stroke distance of the opening and closing of the lower valve plate mechanism, the third diaphragm design must have multiple characteristics such as high sealing performance, large movement variable, and resistance to pulling and extrusion without breakage. Therefore, the third diaphragm is mostly made of pressure-resistant deformable plastic materials such as modified rubber, Teflon, or silicone sheets. Since a longer actuation stroke can make the valve plate open higher and more completely, and the occurrence of a long actuation stroke is completely restricted by the deformation amount of the third diaphragm connected to the valve plate mechanism, a plastic rubber diaphragm with high elasticity and high deformation is necessary.

[0064] In this embodiment, for the connection between pipes and the connection between the upper housing and the lower housing, etc., various methods such as flange connection, threaded connection, or pipe clamp connection can be selected.

[0065] In this embodiment, the converter can be connected to and control the opening and closing of various vacuum valves on the market with the same function but different structures, not limited to the vacuum valve described in this embodiment. This embodiment is only exemplary and non-limiting.

[0066] The working principle or working process of the present invention:

[0067] Vacuum valve opening:

[0068] When the accumulated water level in the vacuum well reaches the high liquid level, the gas in the liquid level detection tube 3 in the vacuum well is compressed due to the rising liquid level in the vacuum well. The compressed gas is transmitted to the upper end interface of the negative pressure trigger converter and enters the air chamber A1. When the water level in the vacuum well reaches the high liquid level W1, the compressed gas also reaches the highest peak in the air chamber A1 and generates the maximum pressure to cause the deformation of the transmission diaphragm. The pressure difference between the air chamber A2 and the air chamber A1 causes the second diaphragm to generate a deformation displacement and drives the second sliding shaft to displace synchronously. The second sliding shaft gradually disengages from the vacuum channel A, and a small amount of vacuum gas is introduced into the third air chamber through the vacuum channel A and quickly fills it. Since the air chamber A4 is connected to the atmosphere and maintains the atmospheric pressure state, the pressure difference between the air chamber A3 and the air chamber A4 causes the first diaphragm to generate a deformation displacement and drives the first sliding shaft to displace synchronously. The first sliding shaft blocks the atmospheric channel C to prevent the atmosphere in the air chamber A5 from entering the air chamber A6. At the same time, the vacuum channel B is opened, and the vacuum gas in the air chamber A7 is introduced into the air chamber A6. The air chamber A6 is transformed into a vacuum negative pressure state. When the upper air vent of the vacuum valve is connected to the vacuum and the lower air vent is connected to the atmospheric pressure, the third diaphragm generates a deformation displacement towards the upper housing direction. At this time, the third diaphragm compresses the spring in the upper housing and drives the valve plate mechanism to move towards the upper housing direction, and then the vacuum valve gradually opens to full open, and the water flow in the pipeline flows.

[0069] Vacuum valve closed:

[0070] When the water level in the vacuum well is at the low liquid level W0, the gas space in the liquid level detection tube 3 in the vacuum well becomes larger and the gas pressure becomes smaller. The pressure difference between the air chambers A1 and A2 in the second air chamber group where the negative pressure trigger converter is connected to the liquid surface becomes smaller. The second diaphragm deforms and returns to a flat shape. At the same time, under the combined action of the reaction force of the second spring, the second sliding shaft is driven to move back. The second sliding shaft gradually returns to its original position and blocks the vacuum channel A, blocking the entry of vacuum gas into the air chamber A3. Since the air chamber A3 has a fine adjustment hole, the atmosphere will continuously enter the air chamber A3, causing the air chamber A3 to gradually change to the atmospheric pressure state. It should be noted that this fine adjustment hole also continuously supplements a small amount of atmosphere during the process of the air chamber A3 changing to a vacuum state, but this small amount of atmosphere is continuously sucked and processed by the vacuum gas. Compared with the amount of vacuum gas entering this air chamber, the atmosphere introduced through the fine adjustment hole is very small and does not affect the conversion of the air chamber A3 to the vacuum state. After the air chamber A3 is converted to the atmospheric state, there will also be no pressure difference with the air chamber A4. The first diaphragm will gradually tend to be flat as the air chamber A3 returns to the atmospheric state at a certain speed, and at the same time, the first sliding shaft is driven to move synchronously. The first sliding shaft returns to its original position and blocks the vacuum channel B to cut off the vacuum supply. At the same time, the atmospheric channel C is opened to allow the atmosphere in the air chamber A5 to supplement and enter the air chamber A6. After the air chamber A6 gradually changes to the atmospheric state, the air chamber A6 is connected to the vacuum valve. That is, when the upper and lower air vents of the vacuum valve are both connected to the atmospheric pressure, the third diaphragm deforms and returns, and under the huge reaction force of the spring, it jointly pushes the valve plate mechanism to move downward towards the lower housing until it abuts against the valve port in the pipeline. The valve plate is in sealed fit with the valve port, and the vacuum valve is closed, cutting off the water flow in the pipeline.

[0071] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0072] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0073] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. 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 circumstances.

Claims

1. A negative pressure trigger converter, connected to a vacuum valve and used to control the opening and closing of the vacuum valve, characterized in that: It includes a first air chamber group and a trigger mechanism. The trigger mechanism is connected to the first air chamber group. A switching mechanism is provided in the first air chamber group. When the trigger mechanism acts, it can drive a change in the air pressure in the first air chamber group, and the change in the air pressure in the first air chamber group can drive the switching mechanism to act to control the opening and closing of the vacuum valve; The trigger mechanism is arranged in a second air chamber group, and the change in the air pressure in the second air chamber group can drive the trigger mechanism to perform a linear reciprocating motion; The switching mechanism includes a first diaphragm and a first sliding shaft. The first diaphragm is arranged in the first air chamber group. One end of the first sliding shaft is connected to the first diaphragm. When the trigger mechanism acts, it causes a change in the air pressure in the first air chamber group, thereby driving the first diaphragm to deform and generate a displacement to drive the first sliding shaft to move synchronously. The other end of the first sliding shaft performs a linear reciprocating motion between an open position for controlling the opening of the vacuum valve and a closed position for controlling the closing of the vacuum valve; The trigger mechanism includes a second diaphragm and a second sliding shaft. The second diaphragm is arranged in the second air chamber group. One end of the second sliding shaft is connected to the second diaphragm, and the other end is connected to the first air chamber group. The change in the air pressure in the second air chamber group can drive the second diaphragm to deform and generate a displacement, and when the second diaphragm deforms and generates a displacement, it can drive the second sliding shaft to move synchronously.

2. The negative pressure trigger converter according to claim 1, characterized in that The second air chamber group is communicated with the liquid level, and the change in the air pressure in the second air chamber group changes with the change in the liquid level height of the liquid level.

3. The negative pressure trigger converter according to claim 1, characterized in that The switching mechanism further includes a first spring. The first spring is connected to the first diaphragm and is located on both sides of the first diaphragm with the first sliding shaft respectively. When the first diaphragm deforms and generates a displacement, it can squeeze the first spring and recover the deformation under the action of the first spring.

4. The negative pressure trigger converter according to claim 1, characterized in that The first air chamber group includes a plurality of gas channels, and the plurality of gas channels are respectively communicated with vacuum and atmospheric pressure.

5. The negative pressure trigger converter according to claim 1, wherein: The trigger mechanism further includes a second spring. The second spring is arranged in the second air chamber group and is sleeved on the outer periphery of the second sliding shaft. When the second diaphragm deforms and generates a displacement, it can squeeze the second spring and recover the deformation under the action of the second spring.

6. A vacuum valve control system having the negative pressure trigger converter according to any one of claims 1-5, characterized in that It includes a converter and a vacuum valve. The converter is connected to the vacuum valve to control the opening and closing of the vacuum valve.

7. The vacuum valve control system according to claim 6, wherein The vacuum valve includes an upper housing, a lower housing and a third diaphragm. The third diaphragm is clamped between the upper housing and the lower housing, so that the upper housing and the lower housing are sealed by the third diaphragm and are not communicated with each other; the third diaphragm is a flat rubber membrane.

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