Pneumatic valve without electronic and electric components

Abstract

This utility model relates to a pneumatically controlled valve without electronic or electrical components. It comprises a liquid level positive pressure chamber, a liquid level normal pressure chamber, a liquid level negative pressure chamber, a starting chamber, a starting normal pressure chamber, a starting negative pressure chamber, an atmospheric chamber, a negative pressure execution chamber, and a negative pressure source chamber, arranged sequentially in a vertical order. A manual start diaphragm or manual start button is located at the center of the top surface of the liquid level positive pressure chamber. The liquid level positive pressure chamber has a liquid level interface. The liquid level negative pressure chamber is connected to the negative pressure source chamber. The liquid level positive pressure chamber and the liquid level normal pressure chamber are separated by a liquid level diaphragm. A first valve sealing pair is provided between the liquid level negative pressure chamber and the starting chamber. The starting negative pressure chamber is connected to the starting chamber. The negative pressure execution chamber has a negative pressure actuator interface. The negative pressure source chamber has a negative pressure air source interface. A second valve sealing pair is provided between the atmospheric chamber and the negative pressure execution chamber. A third valve sealing pair is provided between the negative pressure execution chamber and the negative pressure source chamber. This utility model uses liquid level / air pressure for control, has pressure comparison and delay timing functions, and is suitable for outdoor humid environments.

Description

Technical Field

[0001] This utility model relates to a pneumatic control valve without electronic or electrical components, belonging to the field of automatic control technology, and can be mainly used for the automatic control of sewage negative pressure conveying systems. Background Technology

[0002] The sewage negative pressure conveying system is equipped with a water collector and a negative pressure conveying pipeline. One end of the negative pressure conveying pipeline is connected to the water collector, and the other end is connected to the negative pressure tank. Usually, the sewage from the source can be collected into the water collector by gravity flow or other means. When the water level in the water collector rises to a certain level, the valve on the negative pressure conveying pipeline is opened by the control device, and the sewage in the water collector is pumped into the negative pressure tank by the negative pressure. When the water level in the water collector drops to a certain limit, the valve on the negative pressure conveying pipeline is closed by the control device. Existing control devices mostly employ electronic equipment. The water collector is equipped with a level sensor, which transmits the level signal as an electrical signal to the control device. The control device analyzes and processes the electrical signal, and when certain conditions are met, sends a control signal to the valve on the negative pressure delivery pipeline, controlling the valve to actuate. The valve on the negative pressure delivery pipeline can be an electric valve or a negative pressure valve. When a negative pressure valve is used, the control device electrically opens the control valve on the negative pressure control pipeline, allowing negative pressure to be supplied to the control terminal of the negative pressure valve, thereby controlling its actuation. This electrical control method is effective and feasible under certain conditions, but it has limitations. For example, the water collector and negative pressure delivery pipeline are often located in humid environments, which is detrimental to electrical safety and the protection of electronic equipment. Furthermore, especially in situations where wastewater sources are dispersed, long-distance or large-scale wiring or power supply installations are required, resulting in a large workload for construction and maintenance, and relatively low system reliability. Utility Model Content

[0003] The purpose of this invention is to use liquid level / gas pressure control to avoid the problems caused by electrical and electronic equipment.

[0004] The technical solution of this utility model is as follows: a pneumatically controlled valve without electronic or electrical components, comprising a liquid level positive pressure chamber, a liquid level normal pressure chamber, a liquid level negative pressure chamber, a starting chamber, a starting normal pressure chamber, a starting negative pressure chamber, an atmospheric chamber, a negative pressure execution chamber, and a negative pressure source chamber arranged sequentially from top to bottom. A manual start diaphragm or manual start button is located in the center of the top surface (top plate) of the liquid level positive pressure chamber. The liquid level positive pressure chamber has (e.g., installed) a liquid level interface for connecting a liquid level sensing tube and receiving gas pressure (gas with corresponding pressure) positively correlated with the liquid level. The liquid level normal pressure chamber has (e.g., opened or installed) an atmospheric interface for connecting to the atmosphere. The liquid level negative pressure chamber is connected via a negative pressure channel (which can be internal or external). The negative pressure source chamber is connected via a connecting channel / pipe. The positive pressure chamber and the normal pressure chamber are separated by a diaphragm. A first valve sealing pair (a sealing pair that can be opened and closed) consisting of a level valve core and a first annular seal is provided between the negative pressure chamber and the starting chamber. When the level valve core is in a high position, the first valve sealing pair is closed; when the level valve core is in a low position, the first valve sealing pair is open. The upper part of the level valve core is fixedly connected to the central part of the level diaphragm and is driven by the level diaphragm. The starting normal pressure chamber is provided with (for example, an atmospheric interface is provided or installed) for connecting to the atmosphere. The starting negative pressure chamber is connected through a starting channel (which can be an internal or external connecting hole). The starting chamber is connected to the pipeline / pipeline. A first starting diaphragm separates the starting atmospheric pressure chamber and the starting negative pressure chamber. A second starting diaphragm separates the starting negative pressure chamber and the atmospheric chamber at corresponding locations. The upper part of the starting push rod is fixedly connected to the center of the first starting diaphragm and is driven by it. The lower part of the starting push rod passes through the second starting diaphragm and is fixedly connected to it. The atmospheric chamber has (e.g., has an opening or is equipped with) an atmospheric interface for connecting to the atmosphere. The negative pressure execution chamber has (e.g., is equipped with) a negative pressure actuator interface for connecting the negative pressure actuator (the negative pressure control mechanism of the negative pressure actuator). The negative pressure source chamber is provided with (for example, installed with) a negative pressure air source interface for connecting a negative pressure air source. A second valve sealing pair consisting of a negative pressure actuation valve core and a second annular seal is provided between the atmospheric chamber and the negative pressure actuation chamber. A third valve sealing pair consisting of a negative pressure actuation valve core and a third annular seal is provided between the negative pressure actuation chamber and the negative pressure source chamber. The top end of the negative pressure actuation valve core is connected to (in contact with) the bottom end of the starting push rod and is driven (pushed) by the starting push rod. When the negative pressure actuation valve core is in the high position, the second valve sealing pair is open and the third valve sealing pair is closed. When the negative pressure actuation valve core is in the low position, the second valve sealing pair is closed and the third valve sealing pair is open.

[0005] Furthermore, the manually activated diaphragm is an elastic diaphragm, with its radially central portion (the portion between the central portion and the edge portion) convex upwards, and the bottom surface (lower surface) of the central portion contacting the top of the level valve core.

[0006] Furthermore, the peripheral sealing of the manual actuation diaphragm is connected to the top surface of the positive pressure chamber of the liquid level, and the central part is flat or other shape suitable for manual pressing. The top of the liquid level valve core applies a certain pre-compression to the manual actuation diaphragm (that is, if it is not restricted by the liquid level valve core, the bottom surface of its central part will be lower than the top surface of the liquid level valve core). Thus, the manual actuation diaphragm can rely on its own elasticity to maintain the contact between its central part and the top surface of the liquid level valve core.

[0007] Preferably, the partition structure (the structure used to separate the two chambers) between the atmospheric pressure chamber and the negative pressure chamber is provided with a liquid level valve core seal. The liquid level valve core passes through the central through hole of the liquid level valve core seal, and the central through hole of the liquid level valve core seal is tightly attached to / clamped on the liquid level valve core, thereby realizing the passage and sealing of the liquid level valve core between the atmospheric pressure chamber and the negative pressure chamber.

[0008] Furthermore, the first annular seal is fixedly installed on the partition structure between the liquid level negative pressure chamber and the starting chamber, and its central through hole constitutes the medium channel between the liquid level negative pressure chamber and the starting chamber; the second annular seal is fixedly installed on the partition structure between the atmospheric chamber and the negative pressure execution chamber, and its central through hole constitutes the medium channel between the atmospheric chamber and the negative pressure execution chamber; the third annular seal is fixedly installed on the partition structure between the negative pressure execution chamber and the negative pressure source chamber, and its central through hole constitutes the medium channel between the negative pressure execution chamber and the negative pressure source chamber.

[0009] Furthermore, the level valve core is vertically positioned and passes through the central through hole of the first annular seal; the actuation push rod is vertically positioned and passes through the central portion of the first actuation diaphragm and the second diaphragm, with its lower end connected to the top of the negative pressure actuation valve core; the negative pressure actuation valve core is vertically positioned and passes through the central through hole of the second annular seal and the third annular seal.

[0010] Furthermore, the level valve core is provided with a first spring serving as its reset (return) spring, the actuation push rod is provided with a second spring serving as its reset spring, and the negative pressure actuator valve core is provided with a third spring serving as its reset spring. The first spring is preferably located in the level atmospheric pressure chamber, the second spring is preferably located in the actuation negative pressure chamber, and the third spring is preferably located in the atmospheric chamber.

[0011] Furthermore, the first, second, and third springs can all be pre-compressed helical springs or other suitable springs, applying upward thrust to the level valve core, the actuating push rod, and the negative pressure actuating valve core, respectively. The initial positions of the level valve core, the actuating push rod, and the negative pressure actuating valve core are their respective high positions (highest positions in the working stroke), which is the negative pressure closed state of the pneumatic control valve and can be considered the normal state. Correspondingly, when the pneumatic control valve is in the negative pressure open state, the positions of the level valve core, the actuating push rod, and the negative pressure actuating valve core are their respective low positions (lowest positions in the working stroke).

[0012] Furthermore, the level valve core and the negative pressure actuator valve core can be configured as cylindrical shapes with unequal diameters (cylinders with annular convex and concave structures / stepped structures on the circumference) according to the opening and closing requirements of the relevant valve sealing pairs, so as to achieve the required sealing or non-sealing (opening) between the valve core and the first annular seal, the second annular seal, and the third annular seal at each set position (high position or low position).

[0013] Each annular seal has a central through-hole, through which the level valve core and the negative pressure actuator valve core pass respectively. When the outer diameter of the valve core (level valve core or negative pressure actuator valve core) located in the central through-hole of any seal is smaller than the inner diameter (inner diameter in the free state) of the central through-hole, a gap exists between them, allowing fluid (e.g., air) to pass through, and the corresponding valve sealing pair is in the open state. When the outer diameter of the valve core located in the central through-hole is larger than the inner diameter of the central through-hole, the inner wall of the central through-hole is tightly fitted (clamped) to the valve core, and there is no gap between them, preventing fluid (e.g., air) from passing through, and the corresponding valve sealing pair is in the closed state. Therefore, the outer diameters of the level valve core and the negative pressure actuator valve core at relevant locations (the locations that seal or open with the relevant annular seals during the working stroke) can be appropriately set to ensure that when the level valve core and the negative pressure actuator valve core are in specific positions (high or low), the relevant valve sealing pairs are in the proper open or closed state. The outer diameter of the valve core should also be avoided to prevent excessive force / resistance from the annular seal from hindering valve core operation while ensuring a seal. The level valve core seal adopts the same or similar structure as the annular seal. The area in contact between the level valve core and the central through hole of the level valve core seal is of equal diameter during the working stroke, and the level valve core seal always maintains a seal with the level valve core.

[0014] The level valve core moves vertically along with the level diaphragm (the part of the level diaphragm that connects to the level valve core). The level diaphragm deforms due to the pressure difference on both sides (and other external forces), and the middle part moves downward, which in turn drives the level valve core from a high position to a low position, realizing the state switching of the first valve sealing pair.

[0015] The actuating push rod moves vertically along with the vertical movement of the first actuating diaphragm (the part of the first actuating diaphragm that connects to the negative pressure actuator valve core). The first actuating diaphragm deforms due to the pressure difference on both sides (and other external forces), causing the middle part to move downward, which in turn drives the actuating push rod from a high position to a low position. The actuating push rod pushes the negative pressure actuator valve core from a high position to a low position, realizing the state switching of the second valve sealing pair and the third valve sealing pair.

[0016] The above-mentioned structure can be integrated into a liquid level triggering module, a negative pressure detection module, a start-up and throttling timing module, and a negative pressure execution module. Specifically, the positive pressure liquid level chamber, the normal pressure liquid level chamber, the negative pressure liquid level chamber, and the start-up chamber are integrated into the liquid level triggering module; the normal pressure start-up chamber and the negative pressure start-up chamber are integrated into the negative pressure detection, start-up, and throttling timing module; and the atmospheric chamber, the negative pressure execution chamber, and the negative pressure source chamber are integrated into the negative pressure execution module.

[0017] Preferably, the starting negative pressure chamber is equipped with a throttling timing device.

[0018] Preferably, the throttling timing device uses a throttling regulating valve (a throttling valve that can adjust resistance) fixedly installed on the side wall of the starting negative pressure chamber. The inner end of the throttling regulating valve is connected to the starting negative pressure chamber, and the outer end is connected to the atmosphere. When the air pressure in the starting negative pressure chamber is lower than the atmospheric pressure, air enters the starting negative pressure chamber through the throttling regulating valve, so that the pressure in the starting negative pressure chamber returns to the level of normal pressure or close to normal pressure.

[0019] Preferably, the throttling valve is provided with a timing adjustment knob for resistance adjustment.

[0020] For example, a suitable location on the side wall of the starting negative pressure chamber can be used as the valve body of the throttling control valve, and a medium passage for the throttling control valve can be opened. Alternatively, the valve body of an independent throttling control valve with a medium passage can be sealed and installed on the side wall of the starting negative pressure chamber. A cylindrical timing adjustment knob is threaded onto the medium passage of the throttling control valve. For example, an internal thread can be provided in the area near the outer port of the medium passage, and an external thread can be provided at the rear of the timing adjustment knob. The front of the timing adjustment knob is threaded onto the medium passage. An annular gap forming the throttling channel is left between the front (or body) of the timing adjustment knob and the medium passage of the throttling control valve. The medium passage of the throttling control valve has a side wall through hole that connects to the atmosphere (usually located near the inner side of the internal thread area). By rotating the timing adjustment knob, the effective length of the throttling channel (the length between the inner end of the annular gap and the side wall through hole) can be adjusted, thereby adjusting the throttling resistance of the throttling control valve and thus adjusting the time it takes for the starting negative pressure chamber to return to normal pressure (or close to normal pressure) after being introduced into the throttling control valve under a certain negative pressure state.

[0021] Preferably, the level diaphragm, the first starting diaphragm, and the second starting diaphragm can all adopt a rotational curved surface shape. Under normal conditions (when the pressure difference between the two sides is zero), the radial middle part (the part between the central part and the edge part) convexes downward or upward to facilitate the required deformation, so that the middle part of the diaphragm (the level diaphragm, the first starting diaphragm, or the second starting diaphragm) together with the valve core (level valve core or negative pressure actuator valve core) or push rod (starting push rod) fixedly connected to the middle part can move up and down according to the working requirements.

[0022] Preferably, the negative pressure actuator valve core is provided with a limit lock (or limit lock structure) corresponding to the high position and a limit lock corresponding to the low position, and is provided with a limit lock mechanism (or limit lock module) matching the limit lock. When the negative pressure actuator valve core is in the high position or the low position, the limit lock mechanism performs limit lock on the negative pressure actuator valve core.

[0023] The limiting and locking mechanism is preferably located in the upper part of the atmospheric cavity.

[0024] The number of limit locking mechanisms can be one or more, for example, preferably two or three. Multiple limit locking mechanisms are distributed at equal intervals to achieve a balance of limit locking force and avoid excessive complexity.

[0025] Furthermore, the housing of the limiting locking mechanism is provided with a radially extending limiting locking channel. A locking ball and a locking spring are provided within the limiting locking channel. The locking spring is located on the outer side (radially outer side) of the locking ball, and its inner end acts on the locking ball, pushing it inward. The negative pressure actuating valve core (on its circumferential surface) is provided with two limiting locking ring grooves corresponding to the locking ball, one above the other. The lower limiting locking ring groove constitutes the limiting lock corresponding to the higher position (which can be called the first limiting lock), and the upper limiting locking ring groove constitutes the limiting lock corresponding to the higher position. The first limit lock (which can be called the second limit lock) has an annular protrusion between the two limit lock ring grooves (an annular protrusion structure relative to the ring groove). When either limit lock ring groove is at the same height as the locking ball, the locking ball is partially locked into the limit lock ring groove under the push of the corresponding locking spring, thereby restricting the position of the negative pressure actuator valve core. The first limit lock (the lower limit lock ring groove) restricts the negative pressure actuator valve core to its high position, and the second limit lock (the upper limit lock ring groove) restricts the negative pressure actuator valve core to its low position.

[0026] Preferably, the outer end of the limiting locking channel is threadedly connected to a locking adjustment knob (cylindrical part), and the outer end of the locking spring abuts against the locking adjustment knob. Thus, rotating the locking adjustment knob changes the compression degree of the locking spring, thereby adjusting the limiting locking force on the negative pressure actuator valve core.

[0027] Various specific connection structures and other supporting structures can be set according to actual needs. For example, a manual start diaphragm is provided in the center of the top surface (top plate) of the liquid level positive pressure chamber. The manual start diaphragm is an elastic diaphragm with its radial middle part (the part between the central part and the edge part) convex upward, and the bottom surface (lower surface) of the central part contacts the top of the liquid level valve core.

[0028] Various specific connection structures and other supporting structures can be set according to actual needs.

[0029] The beneficial effects of this utility model are as follows: Using a pneumatically controlled valve as the control device for the negative pressure valve on the negative pressure conveying pipeline, the valve controls the opening and closing of each air path based on the water level in the water collector / pressure changes in the sensing tube. Once the water level in the water collector reaches a certain height, a negative pressure signal is automatically output, thereby controlling the opening of the negative pressure valve on the negative pressure conveying pipeline. After a certain timing period, the negative pressure signal output is automatically stopped, closing the negative pressure valve on the negative pressure conveying pipeline. Thus, while meeting control requirements, no power supply or electrical and electronic equipment is required, fundamentally avoiding electrical safety issues, saving on the construction work of circuit and power supply installation, and the maintenance work of electrical and electronic equipment. Because an independent negative pressure detection, start-up, and throttling timing module is set up, it can better adapt to harsh environments, further improving operational stability and reliability, and facilitating maintenance. Since the negative pressure of the negative pressure conveying system is used as the control power source, and through the integrated valve design, on-site assembly is simple and quick, and does not require additional space. Due to the reasonable design of the pneumatically controlled valve and the allowance for the use of materials suitable for humid environments, it operates reliably, has low maintenance requirements, and a long service life. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the liquid level triggering module of this utility model (initial / off state).

[0032] Figure 3 This is a schematic diagram of the liquid level triggering module of this utility model (open state).

[0033] Figure 4 This is a schematic diagram of the negative pressure detection, start-up, and throttling timing module of this utility model (initial / off state);

[0034] Figure 5 This is a schematic diagram (start-up state) of the negative pressure detection, start-up, and throttling timing module of this utility model;

[0035] Figure 6 This is a schematic diagram of the limit locking module of this utility model (first limit locking state);

[0036] Figure 7 This is a schematic diagram (intermediate state) of the limiting and locking module of this utility model;

[0037] Figure 8 This is a schematic diagram of the limit locking module of this utility model (second limit locking state);

[0038] Figure 9This is a schematic diagram of the structure of the limit locking module and the negative pressure execution module of this utility model (negative pressure off state).

[0039] Figure 10 This is a schematic diagram of the structure of the limit locking module and the negative pressure execution module of this utility model (negative pressure on state).

[0040] Figure 11 Therefore Figure 2 The diagram shows a schematic of the installation structure of an elastic diaphragm or similar component, taking part B as an example.

[0041] Figure 12 This is a schematic diagram of the system structure of one usage method of this utility model.

[0042] The diagram shows the following components: 1. Pneumatic control valve; 2. Negative pressure actuator (usually a negative pressure valve); 3. Water collection tank; 4. Sensor tube; 5. Sensor tube connecting pipe; 6. Drain pipe; 7. Negative pressure pipeline; 8. Negative pressure air source intake port; 9. Negative pressure source connecting pipe; 10. Liquid level trigger module; 101. Manual start diaphragm; 102. Liquid level positive pressure chamber; 103. Liquid level diaphragm; 104. Liquid level atmospheric pressure chamber; 105. Liquid level valve core seal; 06. Liquid level valve core; 107. Liquid level negative pressure chamber; 108. First annular seal; 109. Starting chamber; 110. First spring; 131. Connecting part; 132. Connecting base; 133. Connecting pressure plate; 20. Negative pressure detection, starting and throttling timing module; 201. Starting atmospheric pressure chamber; 202. First starting diaphragm; 203. Starting negative pressure chamber; 204. Second starting diaphragm; 205. Starting push rod; 206. 1. Throttling outlet; 207. Throttling port; 208. Throttling inlet; 209. Throttling regulating valve core; 210. Second spring; 30. Limit locking module; 301. Negative pressure actuation valve core; 302. Third spring; 303. Locking ball; 304. Locking adjustment knob; 305. Locking spring; 306. First limit locking; 307. Second limit locking; 40. Negative pressure actuation module; 401. Atmospheric cavity; 402. Second annular seal; 403. Negative pressure actuation chamber; 404. Third annular seal; 405. Negative pressure source chamber; A1. First atmospheric passage; A2. Second atmospheric passage; A3. Third atmospheric passage; A4. Fourth atmospheric passage; P1. First negative pressure passage; P2. Second negative pressure passage; S1. First start-up passage; S2. Second start-up passage; L. Liquid level interface; V. Negative pressure actuation mechanism interface; P. Negative pressure gas source interface. Detailed Implementation

[0043] See Figure 12This pneumatic control valve 1 is a pneumatically controlled valve that does not require electrical or electronic devices. It can be considered a pneumatically controlled two-position three-way valve with pressure comparison and delay timing functions. Its working position is changed / determined based on the air pressure input to the control terminal. Its common interface (multi-port) is the negative pressure actuator interface V, used to connect the negative pressure actuator (usually a negative pressure valve on a negative pressure delivery pipeline) 2. Of the two single ports, one is an atmospheric interface A, and the other is a negative pressure air source interface P. It is connected to the negative pressure air source intake port 8 on the negative pressure pipeline 7 via a negative pressure source connecting pipe (air pipe) 9. The sump 3 for collecting sewage is equipped with a sensing pipe 4 for sensing the water level (or liquid level) in the sump. The sensing pipe 4 can be a vertical pipe with a closed top and an open bottom. The top has a sensing interface, which is connected to the liquid level interface L of the pneumatic control valve 1 via a sensing pipe connecting pipe (air pipe) 5. When the sump... When the water level in the reservoir is lower than the bottom opening of the sensing tube, the air inside the sensing tube is at normal pressure. Therefore, the liquid level interface L of the pneumatic control valve 1 is connected to normal pressure. In this case, the negative pressure actuator interface V of the pneumatic control valve 1 is connected to the atmospheric interface A. The air pressure connected to the control end of the negative pressure actuator 2 is at normal pressure, and the negative pressure actuator 2 does not start (the negative pressure valve is closed). When the water level in the reservoir exceeds the bottom opening of the sensing tube, as the water level in the reservoir continues to rise, the gas pressure at the top of the sensing tube also continues to rise. When this pressure reaches or exceeds a certain value, the negative pressure actuator interface V of the pneumatic control valve 1 is connected to the negative pressure air source interface P. The air pressure connected to the control end of the negative pressure actuator 2 is the negative pressure source negative pressure, and the negative pressure actuator 2 starts (the negative pressure valve opens). Under the negative pressure of the negative pressure pipeline 7, the sewage in the reservoir is pumped into the negative pressure pipeline 7 through the drain pipe 6 and sent to the negative pressure station.

[0044] See Figures 1 to 10 This pneumatically controlled valve mainly consists of four functional modules: a liquid level trigger module 1; a negative pressure detection, start-up, and throttling timing module 2; a limit locking module 3; and a negative pressure execution module 4. The first negative pressure channel P1 and the second negative pressure channel P2 are connected, as are the first start-up channel S1 and the second start-up channel S2. The liquid level interface L, the negative pressure actuator interface V, and the negative pressure air source interface P are respectively connected to the pressure / water level sensing interface at the top of the sensing tube (or the pressure / water level sensing interface of another similar sensor), the negative pressure control interface of the negative pressure actuator (e.g., the negative pressure valve on the negative pressure delivery pipeline), and the negative pressure air source (which can use the negative pressure of the negative pressure delivery system as the negative pressure air source, connected to any suitable location in the system capable of drawing out negative pressure air). The first atmospheric interface A1, the second atmospheric interface A2, the third atmospheric interface A3, and the fourth atmospheric interface A4 are all connected to the atmosphere. Filters may or may not be provided at the interfaces.

[0045] The working principle of each module is as follows:

[0046] I. Liquid Level Trigger Module

[0047] Initial closed state: Liquid level interface L is pressureless, i.e., open to the atmosphere. Negative pressure channel P2 is connected to the negative pressure air source via negative pressure channel P1 (normally open). Liquid level valve core 106 is sealed between itself, liquid level valve core seal 105, and the first annular seal 108 in the initial position, together maintaining the negative pressure state of liquid level negative pressure chamber 107 and isolating it from liquid level normal pressure chamber 104 and starting chamber 109. Liquid level diaphragm 103 is kept closed under the action of the first spring 110, and liquid level positive pressure chamber 102, liquid level normal pressure chamber 104, and starting chamber 109 are all at normal pressure.

[0048] Liquid level open state: The air pressure connected to the liquid level interface L and the air pressure in the positive pressure chamber 102 increase with the increase of the liquid level in the water collector. The atmospheric pressure chamber 104 is connected to the first atmospheric channel A1, maintaining atmospheric pressure. The liquid level diaphragm 103 overcomes the elastic force of the first spring 110, pushing the liquid level valve core 106 to move. The first annular seal 108 disengages from the liquid level valve core 106. The negative pressure chamber 107 is connected to the start chamber 109 and is in a negative pressure state. It outputs negative pressure through the first start channel S1, thereby controlling the state changes of subsequent modules. The negative pressure is connected to the negative pressure control interface of the negative pressure actuator through the negative pressure actuator interface, starting the negative pressure extraction of water from the water collector.

[0049] When the water level in the water collector drops to a certain level, the positive pressure connected to the liquid level interface L disappears, the liquid level valve core 106 returns to its original position under the action of the first spring 110, the first annular seal 108 seals the liquid level valve core 106 again, cutting off the connection between the liquid level negative pressure chamber 107 and the start chamber 109, and the start channel S1 no longer has negative pressure output.

[0050] When needed, the manual start diaphragm 101 can be pressed manually to move the liquid level valve core 106. The subsequent working process is the same as the working process under liquid level start. When the start diaphragm 101 is released, the liquid level valve core 106 returns to its original position under the push of the first spring 110. The subsequent working process is the same as the working process after the positive pressure connected to the liquid level interface L disappears.

[0051] II. Negative Pressure Detection, Start-up and Throttling Timing Module

[0052] The first starting diaphragm 202 and the second starting diaphragm 204 drive and guide the starting push rod 205 to move. The second starting channel S2 is connected to the first starting channel S1 of the liquid level trigger module. The starting negative pressure chamber 203 is connected to the third atmospheric channel A3 through the throttling outlet 206, the throttling port (or throttling channel) 207 and the throttling inlet 208. The starting normal pressure chamber 201 is connected to the second atmospheric channel A2.

[0053] In the initial closed state, the starting negative pressure chamber 203 is at normal pressure. Under the action of the second spring 210, the starting negative pressure chamber 203 is in the state of maximum internal space.

[0054] Negative pressure detection and start-up process: The second start-up channel S2 is connected to the first start-up channel S1. If the incoming negative pressure is lower than a certain set value, it is insufficient to overcome the force of the second spring 210, and the space inside the start-up negative pressure chamber 203 will not contract, and the first start-up diaphragm 202 will not drive the start-up push rod 205 to move downward. When the negative pressure connected to the second start-up channel is high enough to overcome the force of the second spring 210, the internal space of the start-up negative pressure chamber 203 shrinks, the first start-up diaphragm 205 moves downward, pushing the negative pressure actuator valve core 301 downward to implement the relevant start-up action.

[0055] Throttling timing: When the liquid level trigger module is closed (the first annular seal 108 and the liquid level valve core 106 are sealed again), the first start channel S1 no longer has negative pressure output, and then enters the throttling timing state: When the timing starts, the start negative pressure chamber 203 is in a negative pressure state, that is, the internal air pressure is less than the external atmospheric pressure. The external air enters the start negative pressure chamber 203 through the throttling inlet 208, throttling port 207 and throttling outlet 206 of the throttling regulating valve. The medium channel (throttling port 207) in the throttling regulating valve is a channel with a very small gap, which applies resistance and flow restriction to the passing airflow. When the air entering the start negative pressure chamber 203 restores the air pressure in the start negative pressure chamber to a certain value, under the action of the second spring 210, the start push rod 205 moves up and returns to its position, the timing ends, the negative pressure detection, start and throttling timing module 2 is closed, and the negative pressure execution valve core 301 moves up and returns to its position.

[0056] The axial position of the valve core (plug) 209 of the throttling regulating valve can be adjusted according to actual needs (the valve core 209 can be threaded onto the corresponding pipe hole, and the required position adjustment can be achieved by rotating the valve core 209), thereby changing the throttling resistance, which in turn changes the flow rate of air entering the starting negative pressure chamber 203, and thus changes the time for the starting push rod 205 to move back to its original position (the time from the start of timing to the return of the starting push rod 205 to its original position), thereby achieving timing adjustment.

[0057] III. Limit Locking Module

[0058] The negative pressure actuator valve core 301 has an annular protrusion, with recesses on both its upper and lower sides, forming a first limit lock (or first limit lock structure) 306 and a second limit lock (or second limit lock structure) 307. In the initial state, the locking ball 303 engages with the first limit lock 306. The compression of the locking spring 305 can be adjusted by rotating the locking adjustment knob (or locking adjustment plug) 304, thereby adjusting the clamping force of the locking ball 303.

[0059] The negative pressure actuator valve core 301 can move downward under the push of the starter push rod 205, so that the annular protrusion on the negative pressure actuator valve core 301 passes over the locking ball 303. When the highest point of the annular protrusion on the negative pressure actuator valve core 301 (the point with the highest degree of protrusion, that is, the part with the largest diameter in the annular protrusion) passes over the locking ball 303, the negative pressure actuator valve core 301 will suddenly accelerate downward and quickly move to the position where the locking ball 303 is locked on the second limit lock 307, thereby causing the matching module (negative pressure actuator module) to quickly switch (quickly switch to the negative pressure on state).

[0060] After the push rod 205 moves back to its original position, the negative pressure actuator valve core 301 moves back to its original position under the action of the third spring 302. Similar to the previous process, when the highest point of the annular protrusion on the negative pressure actuator valve core 301 passes the locking ball 303, the negative pressure actuator valve core 301 will suddenly accelerate upward and quickly move to the position where the locking ball 303 is locked on the first limit lock 306, thereby causing the matching module (negative pressure actuator module) to quickly switch (quickly switch to the negative pressure disconnect state), that is, return to the initial state.

[0061] IV. Negative Pressure Execution Module

[0062] In the initial state, the negative pressure actuator valve core 301 is positioned with the locking ball 303 locked at the first limit position. The third annular seal 404 seals against the negative pressure actuator valve core 301, isolating the negative pressure actuator chamber 403 from the negative pressure source chamber 405. A gap exists between the second annular seal 402 and the negative pressure actuator valve core 301, allowing the negative pressure actuator chamber 403 to communicate with the atmospheric chamber 401, i.e., to be open to the atmosphere. The negative pressure actuator is in a cut-off state from the negative pressure air source, i.e., the negative pressure actuator is shut off.

[0063] When the negative pressure detection, start-up and throttling timing module is in the start-up + throttling timing state (start-up state or throttling timing state), the negative pressure actuator valve core 301 is pushed to the second limit lock position by the start push rod 205 (the position / state of the negative pressure actuator valve core 301 when the locking ball 303 is stuck on the second limit lock 307). There is a gap between the third annular seal 404 and the negative pressure actuator valve core 301, while the second annular seal 402 is sealed with the negative pressure actuator valve core 301. Therefore, the negative pressure actuator chamber 403 is connected to the negative pressure source chamber 405, while the negative pressure actuator chamber 403 is isolated from the atmospheric chamber 401. The negative pressure actuator interface V is connected to the negative pressure air source interface P, thereby realizing the connection between the negative pressure air source and the negative pressure actuator (negative pressure control end), and the negative pressure actuator works.

[0064] After the negative pressure detection, start-up, and throttling timing module completes its throttling timing, the start push rod 205 moves upward and returns to its original position. The negative pressure actuator valve core 301 returns to the first limit lock position (the position / state of the negative pressure actuator valve core 301 when the locking ball 303 is stuck on the first limit lock 306), that is, it returns to the initial state (or normal state, or normally closed state). The third annular seal 404 seals with the negative pressure actuator valve core 301, cutting off the negative pressure air source. At the same time, the gap between the second annular seal 402 and the negative pressure actuator valve core 301 is restored, and the negative pressure actuator chamber 403 is reconnected to the atmospheric chamber 401. The negative pressure actuator interface V is connected to the atmosphere, and the negative pressure actuator is turned off.

[0065] Based on existing technology, sealing rings or other sealing materials can be provided at the connection points requiring sealing. Depending on actual needs, tongue-and-groove joints or other connection structures conducive to stability and sealing can be provided at pipe-shaped connection points (e.g., between the cylindrical outer wall ports of adjacent cavities). Structures for fixing or embedding sealing rings can also be provided. Threaded connections (e.g., screws) or other suitable connection methods can be used to achieve the fixing of mutually fixed connecting parts. The size of the central through-hole of each annular seal is adapted to the outer diameter of the corresponding valve core (or other cylindrical parts forming the sealing pair with it), and should generally be made of an elastic material (e.g., rubber) (but non-elastic structures are allowed in areas where elastic deformation is not required, depending on actual needs). It is fitted onto the corresponding valve core through the central through-hole. When the valve core is in the corresponding sealing position (the position where the sealing pair with the seal is closed), the outer diameter of the valve core in the central through-hole of the seal should be appropriately larger than the diameter of the central through-hole of the seal (the diameter in the free state), so that the wall of the central through-hole of the seal is tightly attached to / clamped to the outer circle of the valve core. When the corresponding valve core is in the corresponding non-sealing position (the position where the sealing pair with the seal is open, or the open position), the outer diameter of the valve core in the central through-hole of the seal is smaller than the diameter of the central through-hole of the seal, so that there is a gap between the wall of the central through-hole of the seal and the outer circle of the valve core to allow the medium (e.g., air) to pass through. The same valve core (cylindrical part) can form multiple sealing pairs with multiple valve seat seals. The outer diameter of each area of ​​the valve core can be set according to the required state of each sealing pair. When the valve core is in different set positions (for example, moved to different set positions by axial / vertical movement), each sealing pair synchronously switches to the state of the valve core in the corresponding position, thereby realizing the synchronization of the relevant sealing pairs. This not only simplifies the construction of each sealing pair, but also ensures the reliability of the synchronous switching of each sealing pair.

[0066] Diaphragms, sealing rings, and springs that require deformation should be made of appropriate elastic materials, while housings, valve cores, and interfaces (short pipes for connection) that do not require deformation can be made of rigid materials, such as rigid rubber and plastic materials or alloy materials suitable for humid environments.

[0067] See Figure 11 The outer edge (or periphery) of elastic elements such as diaphragms and seals can be fixedly installed in any suitable manner. For example, an annular groove for embedding, snapping, or clamping the installed element can be provided on the component 133 used as the mounting base. A mounting structure 131 conforming to the annular groove is provided on the outer edge of the installed element (e.g., a seal or diaphragm, especially an installed element made of elastic material). The mounting structure is placed into the annular groove, and the mounting structure is pressed down by a pressure plate (or other fastener) 132. The pressure plate is then fixed (e.g., by fastening screws).

[0068] This utility model has the following features:

[0069] 1) Operating mode: Pneumatic, non-contact liquid level start-up trigger;

[0070] 2) It has a negative pressure detection function. It will not work when the negative pressure is insufficient, and will automatically start when the negative pressure meets the requirements.

[0071] 3) It has a timer-off function, with the timer starting when the liquid level disappears (the liquid level drops to the normal level).

[0072] 4) It has a limit locking function to prevent the valve core from reversing and creeping.

[0073] 5) It has a manual start function.

[0074] Unless otherwise specified, the preferred and optional technical means disclosed in this utility model can be arbitrarily combined to form several different specific embodiments when one preferred or optional technical means is a further limitation of another technical means.

Claims

1. A pneumatically controlled valve without electronic or electrical components, characterized in that... The device comprises, in sequence, a positive pressure chamber, a normal pressure chamber, a negative pressure chamber, a starting chamber, a starting normal pressure chamber, a starting negative pressure chamber, an atmospheric chamber, a negative pressure execution chamber, and a negative pressure source chamber. A manual start diaphragm or manual start button is located at the center of the top surface of the positive pressure chamber. The positive pressure chamber has a liquid level interface, and the normal pressure chamber has an atmospheric interface. The negative pressure chamber is connected to the negative pressure source chamber via a negative pressure channel. The positive pressure chamber and the normal pressure chamber are separated by a liquid level diaphragm. A first valve sealing pair, consisting of a liquid level valve core and a first annular seal, is located between the negative pressure chamber and the starting chamber. When the liquid level valve core is in a high position, the first valve sealing pair is closed; when the liquid level valve core is in a low position, the first valve sealing pair is open. The upper part of the liquid level valve core is fixedly connected to the central part of the liquid level diaphragm. The starting normal pressure chamber has an atmospheric interface, and the starting negative pressure chamber is connected to the starting chamber via a starting channel. The negative pressure chambers are separated by a first starting diaphragm. A second starting diaphragm is installed between the negative pressure chamber and the atmospheric chamber. The upper part of the starting push rod is fixedly connected to the central part of the first starting diaphragm, and the lower part passes through the second starting diaphragm and is fixedly connected to it. The atmospheric chamber is provided with an atmospheric interface, the negative pressure execution chamber is provided with a negative pressure execution mechanism interface, and the negative pressure source chamber is provided with a negative pressure air source interface. A second valve sealing pair consisting of a negative pressure execution valve core and a second annular seal is provided between the atmospheric chamber and the negative pressure execution chamber. A third valve sealing pair consisting of a negative pressure execution valve core and a third annular seal is provided between the negative pressure execution chamber and the negative pressure source chamber. The top end of the negative pressure execution valve core is connected to the bottom end of the starting push rod. When the negative pressure execution valve core is in a high position, the second valve sealing pair is open and the third valve sealing pair is closed. When the negative pressure execution valve core is in a low position, the second valve sealing pair is closed and the third valve sealing pair is open.

2. The pneumatic control valve without electronic or electrical components as described in claim 1, characterized in that... The partition structure between the atmospheric pressure chamber and the negative pressure chamber is equipped with a liquid level valve core seal. The liquid level valve core passes through the central through hole of the liquid level valve core seal, and the central through hole of the liquid level valve core seal is tightly attached to / clamped to the liquid level valve core.

3. The pneumatic control valve without electronic or electrical components as described in claim 1, characterized in that... The level valve core is provided with a first spring as its reset spring, the actuation push rod is provided with a second spring as its reset spring, and the negative pressure actuator valve core is provided with a third spring as its reset spring.

4. The pneumatic control valve without electronic or electrical components as described in claim 3, characterized in that... The first spring is located in the liquid level normal pressure chamber, the second spring is located in the starting negative pressure chamber, and the third spring is located in the atmospheric chamber.

5. The pneumatic control valve without electronic or electrical components as described in claim 1, characterized in that... The level valve core and the negative pressure actuator valve core are set into cylindrical shapes of unequal diameter according to the opening and closing requirements of the relevant valve sealing pairs, so as to achieve the required sealing or non-sealing between them and the first annular seal, the second annular seal and the third annular seal at each set position.

6. The pneumatic control valve without electronic or electrical components as described in claim 1, characterized in that... The negative pressure chamber is equipped with a throttling timing device.

7. The pneumatic control valve without electronic or electrical components as described in claim 6, characterized in that... The throttling timing device uses a throttling regulating valve that is fixedly installed on the side wall of the starting negative pressure chamber. The inner end of the throttling regulating valve is connected to the starting negative pressure chamber, and the outer end is connected to the atmosphere. When the air pressure in the starting negative pressure chamber is lower than the atmospheric pressure, air enters the starting negative pressure chamber through the throttling regulating valve, so that the pressure in the starting negative pressure chamber returns to the level of normal pressure or close to normal pressure.

8. The pneumatic control valve without electronic or electrical components as described in claim 7, characterized in that... The throttling control valve is equipped with a timing adjustment knob for resistance adjustment.

9. The pneumatic control valve without electronic or electrical components as described in claim 1, characterized in that... The negative pressure actuator valve core is equipped with a limit lock corresponding to the high position and a limit lock corresponding to the low position, and is equipped with a limit lock mechanism that matches the limit lock.

10. The pneumatic control valve without electronic or electrical components as described in claim 9, characterized in that... The limit locking mechanism is located at the upper part of the atmospheric cavity, and there are one or more limit locking mechanisms, which are evenly distributed.

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