Pilot valve, vacuum valve, vacuum valve system and method for recovering initial conditions of vacuum valve

Abstract

According to the pilot valve, the vacuum valve, the vacuum valve system and the method for recovering the initial condition of the vacuum valve, different from an existing pilot valve which is only used for controlling negative pressure to enter a main valve so that the main valve can open or close a drainage channel, after improvement, related cavities of the pilot valve are communicated, the negative pressure is introduced into the main valve, and meanwhile the negative pressure enters the main valve; the liquid level difference is also introduced into the related cavity of the pilot valve, so that the pilot valve can still keep the state in the water pumping process of the vacuum valve even if the liquid level difference is lower than a preset value, and the vacuum valve continuously pumps water until the liquid level in the facility is lower than the bottom of the water suction pipe, and air is sucked into the related cavity of the pilot valve to dilute the negative pressure amount of the related cavity; therefore, the pilot valve can restore to the initial position, the vacuum valve is triggered again, and the initial liquid level of the vacuum valve can restore to be consistent.

Description

Technical Field

[0001] The present invention relates to the field of drainage, and in particular to a pilot valve, a vacuum valve, a vacuum valve system and a method for restoring the initial condition of the vacuum valve. Background Art

[0002] A vacuum valve typically consists of a pilot valve and a main valve. A pressure pipe is installed within the well. The difference in liquid level inside and outside the pipe creates a certain air pressure inside the pipe. This pressure is transmitted to the pilot valve, which activates it. Under the action of the pilot valve, the main valve connects the water inlet and outlet of the vacuum valve system, thereby pumping water. When the air pressure in the pressure pipe is insufficient, the pilot valve returns to its original position, and pumping stops. Vacuum valves are important actuators in drainage systems. They rely on the air pressure generated by the surrounding liquid level to drive the vacuum valve, requiring no external power supply.

[0003] The state switching of the vacuum valve is only related to the air pressure generated by the high and low liquid levels. During the pumping process, the liquid level difference is always a variable, so it will be opened and closed frequently, which will accelerate the fatigue of the components in the vacuum valve and affect its life.

[0004] Patent No. 2022101858211, "Pilot Valve and Vacuum Valve," provides a solution: When the liquid level fluctuates significantly and reaches the set point, the pilot valve of the vacuum valve rapidly switches position, allowing the main valve to quickly establish a negative pressure position, thereby rapidly pumping water and preventing water from overflowing the well. When the liquid level fluctuates slightly and falls below the set point, the pilot valve of the vacuum valve delays switching position, maintaining the negative pressure position of the main valve. This allows pumping to continue even when the liquid level in the well falls below the set point. Before the pilot valve completes its switching, the well level can reach the set point again, maintaining the pilot valve position, thus avoiding frequent opening and closing of the vacuum valve in a short period of time. This solution delays the closing of the pilot valve by increasing the air intake damping of the chamber, thereby increasing the pilot valve's operating time. However, this solution may have the following issues: The main issue is that when the liquid level in the well rises to the opening level, the vacuum valve opens and pumping begins. After a certain period of time when the pilot valve maintains its operating position, the pilot valve and main valve close, ceasing pumping. Due to fluctuations in vacuum levels, the amount of water pumped during each pilot valve's operating time varies, resulting in varying shutoff levels, often exceeding the bottom of the pressure piping. Due to practical technical limitations, the pressure piping inevitably experiences minute gas leaks. Over time, these leaks can cause the liquid level in the piping to equilibrate with the wellbore, effectively increasing the initial level. This in turn causes the opening level to continuously increase, potentially leading to overflow from the wellhead. A secondary issue is the small gas volume within the chamber, resulting in a low gas pressure differential, meaning the intake volume is minimal, making regulation difficult. To further increase the pilot valve's operating time, the damping orifice size must be reduced. Further reducing the damping orifice not only increases machining complexity but also exponentially increases the risk of clogging in actual use. Summary of the Invention

[0005] In order to at least solve part of the above problems, the present invention makes improvements on the prior art.

[0006] According to a first aspect of the present invention, a pilot valve is provided.

[0007] The pilot valve includes a valve body, which is provided with a pressure guide port, an atmospheric port, a negative pressure port and a main valve port; a valve core assembly is arranged inside the valve body; the valve core assembly includes a diaphragm, a valve stem, a sealing block and a reset member; the pressure guide port is used to access the trigger pressure, which is the pressure that triggers the valve core assembly to change its position, and the trigger pressure is the air pressure obtained by the pressure guide pipe in the liquid level difference. When the valve core assembly is in the first position, the negative pressure port is isolated from the main valve port, and the atmospheric port is connected to the main valve port. When the valve core assembly is in the second position, the negative pressure port is connected to the main valve port, and the atmospheric port is isolated from the main valve port; the valve body includes a first chamber, a second chamber, and a third chamber; adjacent to On both sides of the diaphragm are the first chamber and the second chamber. The first chamber is connected to the pressure guide port, the space where the reset member is located is the second chamber, and the third chamber is a three-way chamber composed of the atmospheric port, the negative pressure port, and the main valve port, which is switched by the sealing block; the second chamber and the third chamber are connected through a connecting pipe; the second chamber is also connected to the atmosphere; when the first chamber enters the triggering pressure, the valve core assembly moves to the second position, the negative pressure enters the second chamber through the third chamber, and the valve core assembly remains in the second position; when the triggering pressure of the first chamber disappears, the atmosphere enters the second chamber through the third chamber, and the valve core assembly moves to the first position.

[0008] Optionally, the valve stem, sealing block, and reset member in the valve core assembly are arranged vertically to the diaphragm, the valve stem is connected to the sealing block and is located on one side of the diaphragm, and the reset member is located on the other side of the diaphragm; when the diaphragm is deformed, the valve core assembly is in the second position and the reset member is deformed; when the reset member is restored, the valve core assembly is in the first position.

[0009] Optionally, the second chamber is provided with a first air hole and a second air hole, and the third chamber is provided with a third air hole, wherein the first air hole is used to connect to the atmosphere, and the second air hole is connected to the third air hole through a connecting pipe.

[0010] Optionally, the apertures of the first pore, the second pore, and the third pore are in a set ratio.

[0011] Optionally, a flow regulating valve is further included, which is arranged on the passage between the second chamber and the third chamber; and / or the flow regulating valve is connected between the second chamber and the atmospheric passage.

[0012] A second aspect of the present invention provides a vacuum valve.

[0013] The vacuum valve comprises a main valve and a pilot valve. The main valve is used to control drainage. The main valve is connected to the main valve port of the pilot valve. The pilot valve is the pilot valve as described in the first aspect.

[0014] According to a third aspect of the present invention, a vacuum valve system is provided.

[0015] A vacuum valve system, comprising a pressure pipe, a water suction pipe, a vacuum valve, a vacuum device, and a water outlet pipe; the pressure pipe and the water suction pipe are fixed in a facility to be pumped; the pressure pipe is used to provide pressure to trigger the operation of the vacuum valve; the water suction pipe is used to pump water in the facility; the vacuum valve comprises a main valve and a pilot valve, the pilot valve controls the main valve to open or block the flow path between the water suction pipe and the water outlet pipe; the characteristic is that the bottom elevation of the water suction pipe is less than or equal to the bottom elevation of the pressure pipe, the pilot valve is the pilot valve according to any one of claims 1 to 5, the pressure pipe and the pilot valve The pressure-guiding port is connected to the negative pressure port of the pilot valve, and the negative pressure port of the pilot valve is connected to the vacuum equipment, and the vacuum equipment is connected to the water outlet pipe; when the liquid level in the facility changes so that the pressure in the pressure-guiding pipe reaches the preset pressure, the pressure in the first chamber of the pilot valve is greater than that in the second chamber, driving the valve core assembly to move to the second position, and the negative pressure port is connected to the main valve port. After the main valve is connected to the negative pressure, water is pumped, and the negative pressure enters the second chamber through the third chamber, and the valve core assembly remains in the second position; when the liquid level in the facility is lower than the bottom of the water suction pipe, the atmosphere enters the second chamber through the third chamber, driving the valve core assembly to return to the first position.

[0016] A fourth aspect of the present invention provides a method for restoring an initial condition of a vacuum valve.

[0017] 2. The method for restoring the initial condition of a vacuum valve is based on a vacuum valve system, wherein the vacuum valve system includes a pressure pipe, a water suction pipe, a vacuum valve, a vacuum device, and a water outlet pipe; the pressure pipe and the water suction pipe are fixed in a facility to be pumped; the pressure pipe is used to provide pressure to trigger the operation of the vacuum valve; the water suction pipe is used to pump water in the facility; the vacuum valve includes a main valve and a pilot valve, the pilot valve controls the operation of the main valve, and the main valve is used to open or block the flow path between the water suction pipe and the water outlet pipe; the pilot valve includes a valve body, which is provided with a pressure guide port, an atmospheric port, a negative pressure port and a main valve port; a valve core assembly is provided inside the valve body; the valve core assembly includes a diaphragm, a valve stem, a sealing block and a reset member; the valve body includes a first chamber, a second chamber and a third chamber; the first chamber and the second chamber are adjacent to both sides of the diaphragm, the first chamber is connected to the pressure guide port, the space where the reset member is located is the second chamber, and the third chamber is a three-way chamber consisting of the atmospheric port, the negative pressure port and the main valve port and switched by the sealing block; its control method includes:

[0018] connecting the third chamber to the second chamber via a connecting pipe;

[0019] An air hole for connecting to the atmosphere is provided in the second chamber;

[0020] Control the bottom elevation of the suction pipe to be less than or equal to the bottom elevation of the pressure pipe;

[0021] Under the action of the vacuum equipment, the initial state of the vacuum valve system is that the valve core assembly built into the pilot valve is in the first position; the negative pressure port of the pilot valve is isolated from the main valve port of the pilot valve, and the atmospheric port of the pilot valve is connected to the main valve port of the pilot valve;

[0022] The change in the liquid level in the facility generates pressure in the pressure pipe, which is transmitted to the first chamber of the pilot valve. When the pressure reaches the set value, the diaphragm of the pilot valve deforms under the action of the pressure, driving the valve core assembly to move to the second position, the reset member deforms, the negative pressure port of the pilot valve is connected to the main valve port of the pilot valve, and the atmospheric port of the pilot valve is isolated from the main valve port of the pilot valve. Negative pressure enters the third chamber, and at the same time, negative pressure enters the second chamber. The amount of negative pressure entering the second chamber is controlled to be greater than the amount of atmospheric pressure entering. The pilot valve is in a self-holding state, and the main valve opens the flow path of the suction pipe and the outlet pipe;

[0023] The liquid level in the facility is lower than the bottom of the suction pipe, and the atmosphere enters the third chamber and the second chamber through the negative pressure port of the pilot valve. The negative pressure in the second chamber is reduced to a critical point, and the reset part is restored, driving the valve core assembly to return to the first position.

[0024] The present invention provides a solution in which the pilot valve's initial state is with the valve core assembly in the first position, isolating negative pressure. When the liquid level in the facility reaches a certain height, a preset pressure is generated in the pressure pipe and enters the first chamber of the pilot valve. The air pressure in the first chamber is greater than that in the second chamber, causing the valve core assembly to move to the second position. Negative pressure enters the third chamber, actuating the main valve and enabling the vacuum valve system to pump water. Because the third chamber is connected to the second chamber, negative pressure enters the second chamber through the third chamber. Due to the increased negative pressure in the second chamber, even if the liquid level difference in the well decreases and the pressure in the pressure pipe drops, the increased negative pressure in the second chamber can still keep the valve core assembly in the second position, allowing the vacuum valve system to continue pumping water. When the vacuum valve pumps water to the bottom of the pumping pipe, air is sucked into the third chamber of the pilot valve and then into the second chamber through the third chamber. The negative pressure in the second chamber decreases, the reset element resets, and the valve core assembly returns to the first state. This solution allows the pilot valve to maintain its current state during the pumping process, even if the liquid level difference is lower than the budgeted value, after the vacuum valve system is first opened. This allows the pilot valve to maintain its current state until the water level drops below the bottom of the suction pipe. The vacuum valve system then draws in a large amount of air through the suction pipe, allowing the pilot valve to change its current state and return to its initial state. This ensures that each pumping operation reaches below the bottom of the suction pipe, while the elevation of the pressure-conducting pipe is greater or less than that of the suction pipe. This ensures that the starting value of the liquid level difference that triggers the next operation of the vacuum valve system is the same. This solution not only reduces the pilot valve's operating frequency during the vacuum valve system's pumping process, making the pumping process more consistent and stable, but also maintains the initial conditions for triggering the vacuum valve system to operate, preventing overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 , schematic diagram of the prior art vacuum valve system;

[0027] Figure 2 , a schematic diagram of a first embodiment of a pilot valve of the present invention;

[0028] Figure 3 , a schematic diagram of a second embodiment of the pilot valve of the present invention;

[0029] Figure 4 , a schematic diagram of a third embodiment of the pilot valve of the present invention;

[0030] Figure 5 , a schematic diagram of a fourth embodiment of the pilot valve of the present invention.

[0031] Reference numerals:

[0032] 11-diaphragm, 12-valve stem, 13-sealing block, 14-reset member;

[0033] P1-first chamber, P2-third chamber, P3-third chamber;

[0034] K1-pressure port, K2-negative pressure port, K3-main valve port, K4-atmospheric port;

[0035] 01-first air hole, 02-second air hole, 03-third air hole, F-flow regulating valve. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the embodiments described are only preferred embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this invention.

[0037] In this application, the valve body refers to the main structure of the valve, and the valve core assembly refers to the actuating mechanism of the valve. The valve core assembly moves in the valve body to achieve the function of opening and closing or switching the flow channel.

[0038] In the present application, the return member includes but is not limited to a spring.

[0039] In this application, “first” or “second” does not represent the degree of importance and is only used to distinguish different components or spaces with similar attributes.

[0040] like Figure 1 The figure shows a prior art vacuum valve system. Patent No. 2022101858211, "Pilot Valve and Vacuum Valve," discloses this vacuum valve system. When the liquid level fluctuates significantly and reaches the set value, the pilot valve of the vacuum valve rapidly switches position, allowing the main valve to quickly establish a negative pressure position, thereby rapidly pumping water and preventing water from overflowing the well. When the liquid level fluctuates slightly and falls below the set value, the pilot valve of the vacuum valve delays switching position, maintaining the negative pressure position of the main valve. This allows pumping to continue even when the liquid level in the well falls below the set value. Before the pilot valve completes its switching, the well level can reach the set value again, maintaining the pilot valve position, thus preventing the vacuum valve from opening and closing frequently within a short period of time. This solution delays the closing of the pilot valve and increases the pilot valve's operating time by increasing the air intake damping in the chamber. However, this solution may have the following issues: 1. The small gas volume and low gas pressure differential within the chamber, i.e., the intake air volume, is very small, making regulation difficult. To further increase the pilot valve's operating time, the damping orifice size must be reduced. The size of the damping hole is further reduced, which not only makes the processing more difficult, but also increases the risk of clogging in actual application exponentially. 2. When the liquid level in the well rises to the opening level, the vacuum valve opens and pumping begins. After a certain period of time when the pilot valve maintains the action, the pilot valve and the main valve close and pumping stops. Affected by the fluctuation of the vacuum degree, the amount of water pumped during each pilot valve maintenance time is different, resulting in different closing liquid level heights. The closing liquid level height is often higher than the bottom of the pressure pipe. Limited by actual technical conditions, the pressure pipe will inevitably have a very small gas leakage rate. After a long period of accumulated leakage, the liquid level in the pressure pipe will be balanced with the liquid level in the well, which is equivalent to the initial liquid level of the pressure pipe continuously increasing, which in turn causes the opening liquid level to continue to increase, and even overflow the wellhead.

[0041] like Figures 2 to 5 This invention is an improvement on the prior art. Figures 2 to 5As shown, the pilot valve includes a valve body, which is provided with a pressure guide port K1, an atmospheric port K4, a negative pressure port K2 and a main valve port K3; a valve core assembly is arranged inside the valve body; the valve core assembly includes a diaphragm 11, a valve stem 12, a sealing block 13 and a reset member 14; the pressure guide port K1 is used to access the trigger pressure, which is the pressure that triggers the valve core assembly to change its position, and the trigger pressure is the air pressure obtained by the pressure guide pipe in the liquid level difference. When the valve core assembly is in the first position, the negative pressure port K1 is isolated from the main valve port K3, and the atmospheric port K4 is connected to the main valve port K3. When the valve core assembly is in the second position, the negative pressure port K1 is connected to the main valve port K3, and the atmospheric port K4 is isolated from the main valve port K3; the valve body includes a first chamber P1, a second chamber P2, and a third chamber P3; Adjacent to both sides of the diaphragm 11 are the first chamber P1 and the second chamber P2. The first chamber P1 is connected to the pressure guide port, the space where the reset member 14 is located is the second chamber P2, and the third chamber P3 is a three-way chamber composed of the atmospheric port K1, the negative pressure port K2, and the main valve port K3, which is switched by the sealing block 13; the second chamber P2 is connected to the third chamber P3 through a connecting pipe; the second chamber P2 is also connected to the atmosphere; when the first chamber P1 enters the triggering pressure, the valve core assembly moves to the second position, the negative pressure enters the second chamber P2 through the third chamber P3, and the valve core assembly remains in the second position; when the triggering pressure of the first chamber P1 disappears, the atmosphere enters the second chamber P2 through the third chamber P3, and the valve core assembly moves to the first position.

[0042] like Figures 2 to 5 The valve stem 12, sealing block 13, and reset member 14 in the valve core assembly are arranged perpendicular to the diaphragm 11. The valve stem 12 is connected to the sealing block 13 and is located on one side of the diaphragm 11, while the reset member 14 is located on the other side of the diaphragm. When the diaphragm 11 is deformed, the valve core assembly is in the second position, and the reset member 14 is deformed. When the reset member 14 is restored, the valve core assembly is in the first position. In this structure, the valve stem 12 is fixed to the valve body by a sleeve. The sleeve is sealed on the side close to the first chamber, while a gap is retained on the side close to the third chamber to ensure that the atmosphere can pass through this gap and communicate with the third chamber.

[0043] The method of enabling the second chamber to communicate with the third chamber includes but is not limited to the following method: a first air hole O1 and a second air hole 02 are provided in the second chamber P2, and a third air hole O3 is provided in the third chamber, wherein the first air hole 01 is used to communicate with the atmosphere, and the second air hole 02 and the third air hole 03 are connected through a connecting pipe.

[0044] In one practicable method, the apertures of the first air hole 01, the second air hole 02, and the third air hole 03 in the pilot valve are set in a set ratio. In this way, after the valve core assembly moves to the second position, negative pressure enters the second chamber through the third chamber. The second chamber is also connected to the atmosphere. Since the pressure of the pressure pipe in the first chamber is variable, in order to keep the valve core assembly in the second position, the amount of negative pressure entering the second chamber needs to be greater than the amount of atmosphere entering the second chamber. Therefore, the apertures of the second air hole 02 and the third air hole 03 should be larger than the aperture of the first air hole 01 and have a certain ratio. Figure 2 As shown in FIG, the air intake amount of the second chamber is achieved by controlling the aperture size only.

[0045] In one practicable manner, the pilot valve further includes a flow regulating valve F1. By adding the flow regulating valve, the air intake of the second chamber can be flexibly regulated. This method is relatively easier to regulate, has lower requirements on the aperture ratio, and reduces accuracy. Figure 3 The flow regulating valve shown is set on the passage between the second chamber and the third chamber to control the air intake of the second chamber. It only needs to control the negative pressure of the second chamber to be lower than the critical point to overcome the reset element and keep the pilot valve in a maintained state. Figure 4 As shown, an alternative method is to still connect the third chamber with the second chamber. The difference is that the flow regulating valve is not set on the passage between the third chamber and the second strong chamber, but is set on the passage between the second chamber and the atmosphere. Therefore, the purpose can be achieved by adjusting the air intake of the atmosphere. Figure 5 As shown, an alternative method is that the flow regulating valve is not set on the passage between the third chamber and the second strong chamber, and a flow regulating valve is also set between the second chamber and the atmospheric passage. The air intake volume of the two routes is adjusted at the same time, which can also achieve the regulation purpose.

[0046] In the vacuum valve system, the vacuum valve is one of the main components. The vacuum valve includes a main valve and a pilot valve. The main valve is used to control drainage. The main valve is connected to the main valve port of the pilot valve. The pilot valve is the improved pilot valve of the present invention. The pilot valve is used in the vacuum valve system to solve the main problems of the existing vacuum valve system. An improved vacuum valve system includes a pressure pipe, a suction pipe, a vacuum valve, a vacuum device, and an outlet pipe; the pressure pipe and the suction pipe are fixed in the facility to be pumped; the pressure pipe is used to provide pressure to trigger the vacuum valve to work; the suction pipe is used to pump water in the facility; the vacuum valve includes a main valve and a pilot valve, and the pilot valve controls the main valve to open or cut off the flow path between the suction pipe and the outlet pipe; the bottom elevation of the suction pipe is less than or equal to the bottom elevation of the pressure pipe, the pressure pipe is connected to the pressure port of the pilot valve, and the negative pressure of the pilot valve The pressure port is connected to the vacuum equipment, and the vacuum equipment is connected to the water outlet pipe; when the liquid level in the facility changes so that the pressure in the pressure pipe reaches the preset pressure, the pressure in the first chamber of the pilot valve is greater than that in the second chamber, driving the valve core assembly to move to the second position, and the negative pressure port is connected to the main valve port. After the main valve is connected to the negative pressure, water is pumped, and the negative pressure enters the second chamber through the third chamber, and the valve core assembly remains in the second position; when the liquid level in the facility is lower than the bottom of the suction pipe, the atmosphere enters the second chamber through the third chamber, driving the valve core assembly to return to the first position.

[0047] In the vacuum valve system in the prior art, the liquid level difference is a condition for triggering the operation of the vacuum valve. However, after repeated use, the initial liquid level becomes higher, causing the triggering liquid level to become higher. It is possible that overflow in the facility fails to reach the liquid level difference that triggers the operation of the vacuum valve, and the vacuum valve system will become a failed system. It is hoped that the starting liquid level of this system can be below the bottom of the pressure pipe, so as to ensure that the starting liquid level of the next round is the same. Based on this purpose, the present invention provides a method for restoring the initial conditions of the vacuum valve. The method is based on a vacuum valve system, which includes a pressure pipe, a water suction pipe, a vacuum valve, a vacuum device, and a water outlet pipe; the pressure pipe and the water suction pipe are fixed in the facility to be pumped; the pressure pipe is used to provide pressure to trigger the operation of the vacuum valve; the water suction pipe is used to pump water in the facility; the vacuum valve includes a main valve and a pilot valve, the pilot valve controls the operation of the main valve, and the main valve is used to open Or it blocks the flow path of the water suction pipe and the water outlet pipe; the pilot valve includes a valve body, which is provided with a pressure guide port, an atmospheric port, a negative pressure port and a main valve port; a valve core assembly is provided inside the valve body; the valve core assembly includes a diaphragm, a valve stem, a sealing block and a reset member; the valve body includes a first chamber, a second chamber and a third chamber; the first chamber and the second chamber are adjacent to both sides of the diaphragm, the first chamber is connected to the pressure guide port, the space where the reset member is located is the second chamber, and the third chamber is a three-way chamber consisting of the atmospheric port, the negative pressure port and the main valve port and switched by the sealing block; its control method includes:

[0048] connecting the third chamber to the second chamber via a connecting pipe;

[0049] An air hole for connecting to the atmosphere is provided in the second chamber;

[0050] Control the bottom elevation of the suction pipe to be less than or equal to the bottom elevation of the pressure pipe;

[0051] Under the action of the vacuum equipment, the initial state of the vacuum valve system is that the valve core assembly built into the pilot valve is in the first position; the negative pressure port of the pilot valve is isolated from the main valve port of the pilot valve, and the atmospheric port of the pilot valve is connected to the main valve port of the pilot valve;

[0052] The change in the liquid level in the facility generates pressure in the pressure pipe, which is transmitted to the first chamber of the pilot valve. When the pressure reaches the set value, the diaphragm of the pilot valve deforms under the action of the pressure, driving the valve core assembly to move to the second position, the reset member deforms, the negative pressure port of the pilot valve is connected to the main valve port of the pilot valve, and the atmospheric port of the pilot valve is isolated from the main valve port of the pilot valve. Negative pressure enters the third chamber, and at the same time, negative pressure enters the second chamber. The amount of negative pressure entering the second chamber is controlled to be greater than the amount of atmospheric pressure entering. The pilot valve is in a self-holding state, and the main valve opens the flow path of the suction pipe and the outlet pipe;

[0053] The liquid level in the facility is lower than the bottom of the suction pipe, and the atmosphere enters the third chamber and the second chamber through the negative pressure port of the pilot valve. The negative pressure in the second chamber is reduced to a critical point, and the reset part is restored, driving the valve core assembly to return to the first position.

[0054] The present invention provides a solution in which the pilot valve's initial state is with the valve core assembly in the first position, isolating negative pressure. When the liquid level in the facility reaches a certain height, a preset pressure is generated in the pressure pipe and enters the first chamber of the pilot valve. The air pressure in the first chamber is greater than that in the second chamber, causing the valve core assembly to move to the second position. Negative pressure enters the third chamber, actuating the main valve and enabling the vacuum valve system to pump water. Because the third chamber is connected to the second chamber, negative pressure enters the second chamber through the third chamber. Due to the increased negative pressure in the second chamber, even if the liquid level difference in the well decreases and the pressure in the pressure pipe drops, the increased negative pressure in the second chamber can still keep the valve core assembly in the second position, allowing the vacuum valve system to continue pumping water. When the vacuum valve pumps water to the bottom of the pumping pipe, air is sucked into the third chamber of the pilot valve and then into the second chamber through the third chamber. The negative pressure in the second chamber decreases, the reset element resets, and the valve core assembly returns to the first state. This solution allows the pilot valve to maintain its current state during the pumping process, even if the liquid level difference is lower than the budgeted value, after the vacuum valve system is first opened. This allows the pilot valve to maintain its current state until the water level drops below the bottom of the suction pipe. The vacuum valve system then draws in a large amount of air through the suction pipe, allowing the pilot valve to change its current state and return to its initial state. This ensures that each pumping operation reaches below the bottom of the suction pipe, while the elevation of the pressure-conducting pipe is greater or less than that of the suction pipe. This ensures that the starting value of the liquid level difference that triggers the next operation of the vacuum valve system is the same. This solution not only reduces the pilot valve's operating frequency during the vacuum valve system's pumping process, making the pumping process more consistent and stable, but also maintains the initial conditions for triggering the vacuum valve system to operate, preventing overflow.

[0055] In the implementation form of the vacuum valve, the main valve of the vacuum valve can also be implemented in other forms, such as a piston type. This application will not list them one by one. Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of the present invention and are not limiting. Although the present invention is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the present invention can be modified or replaced or recombined without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A pilot valve comprising a valve body provided with a pressure guide port, an atmospheric port, a negative pressure port, and a main valve port; a valve core assembly disposed within the valve body; the valve core assembly comprising a diaphragm, a valve stem, a sealing block, and a reset member; the pressure guide port being used to receive a trigger pressure, which is the pressure that triggers the valve core assembly to change position and is the air pressure obtained by the pressure guide pipe in the liquid level difference; when the valve core assembly is in a first position, the negative pressure port is isolated from the main valve port, and the atmospheric port is connected to the main valve port; when the valve core assembly is in a second position, the negative pressure port is connected to the main valve port, and the atmospheric port is isolated from the main valve port; and characterized in that: The valve body includes a first chamber, a second chamber, and a third chamber; the first chamber and the second chamber are adjacent to both sides of the diaphragm, the first chamber is connected to the pressure guide port, the space where the reset member is located is the second chamber, and the third chamber is a three-way chamber composed of an atmospheric port, a negative pressure port, and a main valve port, which is switched by a sealing block; the second chamber and the third chamber are connected through a connecting pipe; the second chamber is also connected to the atmosphere; when the first chamber enters the triggering pressure, the valve core assembly moves to the second position, the negative pressure enters the second chamber through the third chamber, and the valve core assembly remains in the second position; when the triggering pressure of the first chamber disappears, the atmosphere enters the second chamber through the third chamber, and the valve core assembly moves to the first position.

2. The pilot valve according to claim 1, wherein: The valve stem, sealing block and reset member in the valve core assembly are arranged vertically with the diaphragm, the valve stem is connected to the sealing block and is located on one side of the diaphragm, and the reset member is located on the other side of the diaphragm; when the diaphragm is deformed, the valve core assembly is in the second position and the reset member is deformed; when the reset member is restored, the valve core assembly is in the first position.

3. The pilot valve according to claim 1, wherein: The second chamber is provided with a first air hole and a second air hole, and the third chamber is provided with a third air hole, wherein the first air hole is used to communicate with the atmosphere, and the second air hole is connected to the third air hole through a connecting pipe.

4. The pilot valve according to claim 3, wherein: The apertures of the first pore, the second pore, and the third pore are in a set ratio.

5. The pilot valve according to claim 1, wherein: It also includes a flow regulating valve, which is arranged on the passage between the second chamber and the third chamber; and / or the flow regulating valve is connected between the second chamber and the atmosphere passage.

6. A vacuum valve comprising a main valve and a pilot valve, wherein the main valve is used to control drainage and is connected to the main valve port of the pilot valve, and is characterized in that: The pilot valve is the pilot valve according to any one of claims 1 to 5.

7. A vacuum valve system comprising a pressure-guiding pipe, a water suction pipe, a vacuum valve, vacuum equipment, and a water outlet pipe; the pressure-guiding pipe and the water suction pipe are fixed in the facility to be pumped; the pressure-guiding pipe is used to provide pressure to trigger the operation of the vacuum valve; the water suction pipe is used to pump water from the facility; the vacuum valve comprises a main valve and a pilot valve, the pilot valve controlling the main valve to open or block the flow path between the water suction pipe and the water outlet pipe; characterized in that: The bottom elevation of the water suction pipe is less than or equal to the bottom elevation of the pressure guiding pipe. The pilot valve is the pilot valve according to any one of claims 1 to 5. The pressure guiding pipe is connected to the pressure guiding port of the pilot valve. The negative pressure port of the pilot valve is connected to the vacuum equipment, and the vacuum equipment is connected to the water outlet pipe. When the liquid level in the facility changes so that the pressure guiding pipe reaches the preset pressure, the pressure in the first chamber of the pilot valve is greater than that in the second chamber, driving the valve core assembly to move to the second position, and the negative pressure port is connected to the main valve port. After the main valve is connected to the negative pressure, water is pumped. The negative pressure enters the second chamber through the third chamber, and the valve core assembly remains in the second position. When the liquid level in the facility is lower than the bottom of the water suction pipe, the atmosphere enters the second chamber through the third chamber, driving the valve core assembly to return to the first position.

8. A method for restoring the initial condition of a vacuum valve, based on a vacuum valve system, the vacuum valve system includes a pressure pipe, a water suction pipe, a vacuum valve, a vacuum device, and a water outlet pipe; the pressure pipe and the water suction pipe are fixed in a facility to be pumped; the pressure pipe is used to provide pressure to trigger the operation of the vacuum valve; the water suction pipe is used to pump water in the facility; the vacuum valve includes a main valve and a pilot valve, the pilot valve controls the operation of the main valve, and the main valve is used to open or block the flow path between the water suction pipe and the water outlet pipe; the pilot valve includes a valve body, the valve body is provided with a pressure guide port, an atmospheric port, a negative pressure port and a main valve port; a valve core assembly is arranged inside the valve body; the valve core assembly includes a diaphragm, a valve stem, a sealing block and a reset member; the valve body includes a first chamber, a second chamber and a third chamber; the first chamber and the second chamber are adjacent to both sides of the diaphragm, the first chamber is connected to the pressure guide port, the space where the reset member is located is the second chamber, and the third chamber is a three-way chamber consisting of the atmospheric port, the negative pressure port and the main valve port, which is switched by the sealing block; its control method includes: connecting the third chamber to the second chamber via a connecting pipe; An air hole for connecting to the atmosphere is provided in the second chamber; Control the bottom elevation of the suction pipe to be less than or equal to the bottom elevation of the pressure pipe; Under the action of the vacuum equipment, the initial state of the vacuum valve system is that the valve core assembly built into the pilot valve is in the first position; the negative pressure port of the pilot valve is isolated from the main valve port of the pilot valve, and the atmospheric port of the pilot valve is connected to the main valve port of the pilot valve; The change in the liquid level in the facility generates pressure in the pressure pipe, which is transmitted to the first chamber of the pilot valve. When the pressure reaches the set value, the diaphragm of the pilot valve deforms under the action of the pressure, driving the valve core assembly to move to the second position, the reset member deforms, the negative pressure port of the pilot valve is connected to the main valve port of the pilot valve, and the atmospheric port of the pilot valve is isolated from the main valve port of the pilot valve. Negative pressure enters the third chamber, and at the same time, negative pressure enters the second chamber. The amount of negative pressure entering the second chamber is controlled to be greater than the amount of atmospheric pressure entering. The pilot valve is in a self-holding state, and the main valve opens the flow path of the suction pipe and the outlet pipe; When the liquid level in the valve is lower than the bottom of the suction pipe, the atmosphere enters the third chamber and the second chamber through the negative pressure port of the pilot valve. The negative pressure in the second chamber is reduced to a critical point, the reset member is restored, and the valve core assembly is driven to return to the first position.

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