On-off converter with delayed closing function

Abstract

The application discloses a vacuum valve opening and closing converter with a delayed closing valve function. The converter comprises a plurality of air chambers, one of the air chambers is connected with a gas flow adjusting device, and the converter controls the closing valve time of the vacuum valve through the gas flow adjusting device. The application provides an opening and closing converter with a delayed closing valve function. The gas flow adjusting device is arranged on the opening and closing converter, the gas flow is adjustable, the gas conversion of the opening and closing converter is delayed, and thus the closing time of the connected vacuum valve is delayed.

Description

Technical Field

[0001] This invention belongs to the technical field of water treatment equipment, and in particular relates to an on / off converter with a delayed valve closing function. Background Technology

[0002] The reason why the sewage being transported in the vacuum system can be drawn into the vacuum negative pressure tank of the vacuum station in stages and continuously is mainly because a large amount of gas is drawn in during the sewage extraction process (including the later stage). After the atmosphere enters the vacuum pipeline, it will quickly flow towards the low pressure and negative pressure direction in the pipeline section. Since the vacuum station provides a vacuum negative pressure suction of -5mH to -6mH, when the atmosphere enters the vacuum pipeline, this huge pressure difference forces the atmosphere to mix rapidly in the low pressure vacuum area. The violent mixing process will push the sewage in the pipeline to the low pressure area, that is, push and transport it in the direction of the vacuum station, thus achieving the purpose of sewage transportation.

[0003] Those skilled in the art have discovered that when a vacuum valve is controlled to open and close via a pneumatic on / off converter, if the vacuum valve does not close or cannot close in time after pumping water, it will continue to draw in a large amount of gas. This large amount of gas entering the vacuum valve's interior can enhance the gas's ability to propel sewage within the vacuum pipeline, achieving the goal of high-speed sewage transport through the vacuum pipeline. Therefore, those skilled in the art are actively researching and developing an on / off converter with the function of controlling the closing time of the vacuum valve. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide an on / off converter with a delayed valve closing function. By setting a gas flow regulating device on the on / off converter, the gas flow can be adjusted, thus delaying the gas switching of the on / off converter and thereby delaying the closing time of the connected vacuum valve.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This invention provides an on / off converter with a delayed valve closing function, which is connected to a vacuum valve and used to control the opening and closing of the vacuum valve. The converter includes several gas chambers, one of which is connected to a gas flow regulating device. The converter controls the valve closing time of the vacuum valve through the gas flow regulating device.

[0007] Furthermore, the gas flow regulating device includes a needle valve.

[0008] More specifically, the converter may include a first air chamber group, a second air chamber group, and a connecting mechanism. The connecting mechanism is located in the first air chamber group and connects to the second air chamber group. There is a connecting channel between the first air chamber group and the second air chamber group. A positive pressure switching mechanism is provided in the second air chamber group. The pressure change in the first air chamber group can drive the connecting mechanism to connect the first air chamber group and the second air chamber group, thereby causing a pressure change in the second air chamber group. The pressure change in the second air chamber group can drive the positive pressure switching mechanism in the second air chamber group to control the opening and closing of the vacuum valve.

[0009] Furthermore, the first air chamber group is connected to the liquid surface, and the air pressure in the first air chamber group changes with the liquid level.

[0010] Furthermore, the communication mechanism includes a first diaphragm, a rocker arm, and a first sliding shaft. The first diaphragm is disposed within the first air chamber group. The middle part of the rocker arm is hinged to the inside of the converter, and its two ends are respectively connected to the first diaphragm and the first sliding shaft. The first sliding shaft is connected to a sealing plug, which is disposed within the first air chamber group. Changes in air pressure within the first air chamber group can drive the first diaphragm to deform and generate displacement, thereby causing the rocker arm to rotate. The rotation of the rocker arm drives the first sliding shaft to move the sealing plug up and down to achieve communication and separation between the first air chamber group and the second air chamber group.

[0011] Furthermore, the positive pressure switching mechanism includes a second diaphragm and a second sliding shaft. The second diaphragm is disposed within the second air chamber group. One end of the second sliding shaft is connected to the second diaphragm. The communication mechanism connects the first air chamber group and the second air chamber group, causing a change in air pressure within the second air chamber group. This causes the second diaphragm to deform and generate displacement, thereby driving the second sliding shaft to move synchronously. The other end of the second sliding shaft performs linear reciprocating motion between the open position (controlling the vacuum valve to open) and the closed position (controlling the vacuum valve to close).

[0012] Furthermore, the converter may include a third air chamber, a fourth air chamber group, and a triggering mechanism. The third air chamber and the fourth air chamber are not connected. The triggering mechanism is located within the third air chamber group. Pressure changes within the third air chamber group can drive the triggering mechanism to perform linear reciprocating motion. The triggering mechanism is connected to the fourth air chamber group. The fourth air chamber group is equipped with a negative pressure switching mechanism. The action of the triggering mechanism can drive pressure changes within the fourth air chamber group. Pressure changes within the fourth air chamber group can drive the negative pressure switching mechanism to control the opening and closing of the vacuum valve.

[0013] Furthermore, the third air chamber group is connected to the liquid surface, and the air pressure of the third air chamber group changes with the liquid level.

[0014] Furthermore, the negative pressure switching mechanism includes a fourth diaphragm and a fourth sliding shaft. The fourth diaphragm is located inside the fourth air chamber group. One end of the fourth sliding shaft is connected to the fourth diaphragm. The action of the triggering mechanism causes a change in the air pressure inside the fourth air chamber group, thereby driving the fourth diaphragm to deform and generate displacement to drive the fourth sliding shaft to move synchronously. The other end of the fourth sliding shaft makes a linear reciprocating motion between the open position of the control vacuum valve and the closed position of the control vacuum valve.

[0015] Furthermore, the triggering mechanism includes a third diaphragm and a third sliding shaft. The third diaphragm is disposed within the third air chamber group. One end of the third sliding shaft is connected to the third diaphragm, and the other end is connected to the fourth air chamber group. Changes in air pressure within the third air chamber group can drive the third diaphragm to deform and generate displacement. When the third diaphragm deforms and generates displacement, it can drive the third sliding shaft to move synchronously.

[0016] The beneficial effects of this invention are:

[0017] 1. This invention sets a gas flow regulating device (needle valve) on the on / off converter to make the gas flow adjustable, thereby delaying the gas conversion of the on / off converter and thus delaying the closing time of the connected vacuum valve. Although the liquid level in the vacuum well is low, the vacuum valve is still open and not closed in a continuous pumping state, that is, a state of fully pumping water and gas, which increases the sewage delivery speed of the vacuum negative pressure pipeline, cleans the flow channel of the vacuum valve plate with gas, and reduces the chance of vacuum valve clogging.

[0018] 2. Compared with the rubber diaphragm in the vacuum valve, the rubber diaphragm in the switch-on converter of this invention is more stable, with smaller displacement and lower diaphragm rupture (the vacuum valve must have a long displacement to open and close the valve plate inside the vacuum valve). Therefore, by adjusting the gas conversion in the switch-on converter to indirectly delay the closing of the vacuum valve, the stability is higher than that of directly delaying the closing time of the vacuum valve.

[0019] 3. The gas flow regulating device (needle valve) is installed at the on / off converter (since the on / off converter is located outside the vacuum well), which facilitates maintenance personnel to inspect and adjust it at any time.

[0020] 4. Neither the positive pressure converter nor the negative pressure converter in this invention requires electricity. They only use the pressure difference generated by the change in the water level in the well to achieve the purpose of controlling the opening and closing of the vacuum valve. By using a small amount of gas to drive the trigger mechanism, a large amount of gas is introduced to drive the positive / negative pressure switching mechanism to achieve the opening and closing of the vacuum valve for the actual target object. The structure is ingenious and the design is reasonable. The whole process only uses the physical gas pressure difference to drive the conversion to open and close the vacuum valve. No electricity (battery, solar energy) is required, saving operating costs and making it highly practical.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the following describes the preferred embodiments of the present invention in detail with reference to the accompanying drawings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of Example 1;

[0023] Figure 2 This is a schematic diagram of the connecting mechanism in Example 1 (excluding the first diaphragm);

[0024] Figure 3 This is the combination of the vacuum valve and the positive pressure converter in Example 1. Figure 1 (Vacuum valve open);

[0025] Figure 4 This is the combination of the vacuum valve and the positive pressure converter in Example 1. Figure 2 (Vacuum valve closed);

[0026] Figure 5 This is a schematic diagram of the structure of Example 2;

[0027] Figure 6 This is the combination of the vacuum valve and the positive pressure converter in Example 2. Figure 1 (Vacuum valve open);

[0028] Figure 7 This is the combination of the vacuum valve and the positive pressure converter in Example 2. Figure 2 (Vacuum valve closed);

[0029] The parts in the attached diagram are labeled as follows:

[0030] Positive pressure converter 1, connecting mechanism 11, first diaphragm 111, rocker arm 112, first sliding shaft 113, sealing plug 114, first spring 115, second diaphragm 16, second sliding shaft 17, second spring 18, air chambers B1, B2, B3, B4, B5, B6, B7, connecting channel A', channel B', channel C', vacuum inlet D', hinge point G;

[0031] Negative pressure converter 2, fourth diaphragm 21, third sliding shaft 22, fourth spring 23, third diaphragm 24, third sliding shaft 25, third spring 26, micro-adjustment hole 27, air chamber A1, air chamber A2, air chamber A3, air chamber A4, air chamber A5, air chamber A6, air chamber A7, vacuum channel A, vacuum channel B, atmospheric channel C;

[0032] Liquid level detection tube 3;

[0033] Needle valves (4a, 4b);

[0034] High liquid level W1, low liquid level W0. Detailed Implementation

[0035] The following specific embodiments illustrate the detailed implementation of the present invention. Those skilled in the art can easily understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented in other different ways, that is, different modifications and changes can be made without departing from the scope disclosed in the present invention.

[0036] This invention discloses an on / off converter with a delayed closing function, which is connected to a vacuum valve and used to control the opening and closing of the vacuum valve. The converter includes several gas chambers, which drive the internal components of the converter to operate through gas pressure conversion, thereby realizing the opening and closing of the vacuum valve. One of the gas chambers is connected to a gas flow regulating device to control its gas flow rate. The converter controls the closing time of the vacuum valve through the gas flow regulating device.

[0037] Specifically, the gas flow regulating device includes a needle valve, which only functions when atmospheric air is introduced, that is, it functions during the vacuum valve closing phase.

[0038] The vacuum valve is a valve with a working pressure lower than the standard atmospheric pressure, and can be a vacuum shut-off valve, a vacuum diaphragm valve, a vacuum solenoid valve, a vacuum safety valve, a vacuum baffle valve, a vacuum slide gate valve, a vacuum inflation valve, etc.

[0039] Example 1: A positive pressure converter with delayed valve closing function, connected to a vacuum valve, the positive pressure converter 1 includes a first gas chamber group, a second gas chamber group and a connecting mechanism 11, the connecting mechanism is located in the first gas chamber group and connects to the second gas chamber group, there is a connecting channel between the first gas chamber group and the second gas chamber group, the second gas chamber group is provided with a positive pressure switching mechanism, the gas pressure change in the first gas chamber group can drive the connecting mechanism to connect the first gas chamber group and the second gas chamber group, thereby causing the gas pressure change in the second gas chamber group, the gas pressure change in the second gas chamber group can drive the positive pressure switching mechanism in the second gas chamber group to operate, thereby realizing the control of opening and closing of the vacuum valve.

[0040] In this embodiment, the first air chamber group is connected to the liquid surface, and the air pressure of the first air chamber group changes with the liquid level.

[0041] Specifically, such as Figure 1As shown, the first gas chamber group includes gas chambers (B1, B2), and the second gas chamber group includes gas chambers (B3, B4, B5, B6, B7). Gas chambers B2 and B3 are connected by a connecting channel A'. Gas chamber B1 is connected to the liquid surface inside the well, and gas chamber B2 is connected to the atmosphere. Gas chambers B3, B4, and B5 are connected to a vacuum, and B7 is connected to the atmosphere. Gas chambers B5 and B6 are connected by a connecting channel B', and B6 and B7 are connected by a connecting channel C'. Gas chamber B3 has a vacuum inlet D' for maintaining a constant vacuum gas source. This vacuum inlet is much smaller than the aperture of connecting channel A', ensuring that when connecting channel A' is fully open, the air intake can exceed that of the vacuum inlet, allowing gas chamber B3 to gradually transition from a vacuum negative pressure state to an atmospheric state.

[0042] like Figures 1-4 As shown, in this embodiment, the gas chamber B3 is equipped with a needle valve 4b. The needle valve can control the vacuum negative pressure replenishment speed of the gas chamber B3, so that the gas chamber B3, which was originally deformed by atmospheric positive pressure, is prevented from continuously entering the gas chamber B3 when the connecting channel A' is closed. At this time, the needle valve will reduce the replenishment of vacuum gas into the gas chamber B3, making the conversion of the gas chamber B3 to a vacuum negative pressure state slower. This achieves the purpose of delaying the recovery time of the second membrane of the positive pressure switching component and the return time of the second sliding shaft. Although the liquid level in the vacuum well is low, the vacuum valve is still open. The closed, continuous pumping state, i.e., the state of full pumping of water and air, increases the sewage delivery speed of the vacuum negative pressure pipeline, cleans the flow channel of the vacuum valve plate with gas, and reduces the chance of vacuum valve clogging. Moreover, the needle valve also makes the closing time of the vacuum valve adjustable, which makes it convenient for staff to set the valve closing time of the vacuum system according to the location of the vacuum wells installed in different vacuum pipelines. That is, different slow closing valve vacuum valve actuation time settings can be used for different situations such as low elevation, far distance from the vacuum station, or multiple vacuum wells set together, making the vacuum system more flexible and complete.

[0043] The gas chamber B3 is equipped with a needle valve, which can make the ratio of the diameter of the connecting channel A' of the gas chamber B3 to the diameter of the vacuum inlet D' manually adjustable, making it more suitable for vacuum wells in different environments and distances.

[0044] Specifically, such as Figure 2As shown, the communication mechanism 11 includes a first diaphragm 111, a rocker arm 112, and a first sliding shaft 113. The first diaphragm is disposed within the first air chamber group, dividing the first air chamber group into two non-communicating air chambers B1 and B2. The rocker arm is disposed in the air chamber B2, and its middle part is hinged to the inside of the positive pressure converter. The two ends of the rocker arm are respectively connected to the first diaphragm and the first sliding shaft. The top end of the first sliding shaft is movably connected to the rocker arm. The first sliding shaft passes through into the air chamber B3. The first sliding shaft is connected to a sealing plug 114 and a first spring 115. The first spring is connected to the end of the first sliding shaft. The first spring and the sealing plug are coaxially arranged. The sealing plug is disposed in the air chamber B2, and the first spring is disposed in the air chamber B3. When the first sliding shaft drives the sealing plug to move upward, it compresses the first spring and returns to its original position under the force of the first spring.

[0045] When the liquid level in the well rises, it compresses the existing air layer in the liquid level detection tube, causing the air layer pressure to continuously increase. This increased air pressure is transmitted to air chamber B1 through a micro-connecting tube. The continuously compressed air accumulates in air chamber B1 and continuously exerts force on the first diaphragm, causing the first diaphragm to deform and displace downwards. The first diaphragm drives the rocker arm in air chamber B2 to rotate in the opposite direction around the hinge point G. The other end of the rocker arm drives the first sliding shaft and the sealing plug to move upwards while compressing the first spring. The connecting channel A' between air chambers B2 and B3 opens, and the atmosphere in air chamber B2 gradually flows into air chamber B3. When the liquid level in the well drops, the first diaphragm gradually recovers its deformation, driving the rocker arm to rotate clockwise around the hinge point G. The other end of the rocker arm drives the first sliding shaft and the sealing plug to move downwards. Under the reaction force of the first spring, the sealing plug seals the connecting channel A', that is, the first air chamber group and the second air chamber group are separated and not connected.

[0046] In this embodiment, the sealing plug is a conical rubber plug.

[0047] In this embodiment, the positive pressure switching mechanism includes a second diaphragm 16, a second sliding shaft 17, and a second spring 18. The second diaphragm is disposed within the second air chamber group and located between air chamber B3 and air chamber B4, which are not interconnected. One end of the second sliding shaft is connected to the second diaphragm, and the other end passes through air chambers B4 and B5 and is located in air chamber B6. The second spring is disposed in air chamber B4 and is connected to the second diaphragm. When air chamber B3 is connected to air chamber B2, the air... When chamber B3 is vented to the atmosphere, it changes from a vacuum state to a normal pressure state. Since chamber B4 is in a vacuum state, the pressure difference between chambers B3 and B4 drives the second diaphragm to deform and displace. When the second diaphragm displaces, it can squeeze the second spring and drive the second sliding axis to move to the closed position. When the connecting channel A' is sealed, chambers B3 and B2 are not in communication. Chamber B3 gradually returns to a vacuum state, and the second diaphragm gradually recovers its deformation and tends to flatten under the reaction force of the second spring.

[0048] When channel B' is open and channel C' is closed, the vacuum in gas chamber B5 is introduced into gas chamber B6, connecting gas chamber B6 to the vacuum valve. At this time, the positive pressure converter can control the vacuum valve to open, and the second sliding shaft is located at channel C', which is the open position for controlling the vacuum valve to open. When channel B' is closed and channel C' is open, the atmosphere in gas chamber B7 is introduced into gas chamber B6, connecting gas chamber B6 to the vacuum valve. At this time, the positive pressure converter can control the vacuum valve to close, and the second sliding shaft is located at channel B', which is the closed position for controlling the vacuum valve to open. Therefore, the change in air pressure in the second gas chamber group can drive the deformation of the second diaphragm to generate displacement, thereby driving the second sliding shaft to move synchronously. The other end of the second sliding shaft makes linear reciprocating motion between the open position for controlling the vacuum valve to open and the closed position for controlling the vacuum valve to close.

[0049] The operation process in this embodiment is as follows:

[0050] The positive pressure converter drives the vacuum valve to open (e.g.) Figure 3 (as shown)

[0051] When the water level in the vacuum well reaches a high level, the gas in the vacuum well level detection pipe is compressed due to the rising water level. This compressed gas is transmitted to the upper interface of the vacuum valve opening / closing converter with a delayed closing function and enters gas chamber B1. When the water level in the vacuum well reaches a high level W1, the compressed gas also reaches its peak value in gas chamber B1, causing maximum pressure and deformation of the transmission diaphragm. The pressure difference between gas chambers B2 and B1 causes the first diaphragm to deform and displace, which in turn drives the rocker arm to move synchronously. When the pressure in gas chamber B1 continues to increase beyond the first spring, the other end of the rocker arm drives the first sliding shaft and sealing plug to move upwards, simultaneously squeezing the first spring. This opens the connection channel A' between gas chambers B2 and B3. When the air in chamber B2 is opened, the atmosphere gradually flows into chamber B3. When the atmospheric flow rate through connecting channel A' is greater than the flow rate through the vacuum inlet of chamber B3, chamber B3 will change from a vacuum negative pressure state to an atmospheric positive pressure state. Since chamber B4 is connected to a vacuum negative pressure system and maintains a vacuum negative pressure state, the pressure difference between chambers B3 and B4 causes the second diaphragm to deform and displace, which in turn drives the second sliding shaft to move synchronously. When the end of the second sliding shaft is in the open position, channel C' closes to prevent the atmosphere in chamber B7 from entering chamber B6. At the same time, channel B' opens, and vacuum gas flows into chamber B6, causing chamber B6 to change to a vacuum negative pressure state. Connecting chamber B6 to the vacuum valve controls the opening of the vacuum valve.

[0052] The positive pressure converter drives the vacuum valve to close (e.g.) Figure 4 As shown):

[0053] When the water level in the vacuum well is at a low level W0, the gas space in the liquid level detection tube of the vacuum well increases and the gas pressure decreases. The pressure difference between gas chambers B1 and B2 in the first gas chamber group connected to the converter and the liquid surface decreases, and the deformation of the first diaphragm returns to a flattened state. At the same time, under the combined action of the first spring's reaction force, the other end of the rocker arm rotates clockwise, causing the first sliding shaft and the sealing plug to move downwards, sealing the connection channel A'. That is, the first and second gas chamber groups are separated and not connected, and gas chambers B1 and B2 are separated and not connected, blocking the entry of atmospheric air from gas chamber B2 into gas chamber B3. Since gas chamber B3 is connected to a vacuum, the vacuum inlet will continuously replenish the vacuum air entering the chamber. The air chamber B3 is gradually transformed into a vacuum negative pressure state. It is worth noting that the air supply volume of this vacuum air supply port is much smaller than the air supply volume when the connecting channel A' is fully open. After the air chamber B3 is transformed into a vacuum negative pressure state, there will be no pressure difference between it and the air chamber B4. The second diaphragm will gradually become flat as the air chamber B3 returns to the atmospheric state. At the same time, it drives the second sliding shaft to move synchronously. The second sliding shaft returns to its original position to block the channel B' to cut off the vacuum supply. At the same time, the channel C' is opened to allow the atmosphere to enter the air chamber B6. The air chamber B6 gradually transforms into an atmospheric state. By connecting the air chamber B6 to the vacuum valve, the closure of the vacuum valve can be controlled.

[0054] Because chamber B3 is equipped with a needle valve, which can control the vacuum negative pressure replenishment speed of chamber B3, the original atmospheric positive pressure deformation of chamber B3 is prevented from continuously entering chamber B3 when the connecting channel A' is closed. At this time, the needle valve will reduce the vacuum gas replenishment into chamber B3, making the transition of chamber B3 to vacuum negative pressure state slower. This delays the recovery time of the second membrane of the positive pressure switching component and the return time of the second sliding shaft. Although the liquid level in the vacuum well is low, the vacuum valve is still open and not closed in a continuous pumping state, that is, a state of full pumping of water and air. This increases the sewage delivery speed of the vacuum negative pressure pipeline, cleans the vacuum valve plate flow channel with gas, and reduces the chance of vacuum valve clogging.

[0055] Example 2: A negative pressure converter with a delayed closing valve function, connected to a vacuum valve and used to control the opening and closing of the vacuum valve. The negative pressure converter 2 includes a third gas chamber, a fourth gas chamber group, and a triggering mechanism. The third and fourth gas chambers are not connected. The triggering mechanism is located within the third gas chamber group. Pressure changes within the third gas chamber group drive the triggering mechanism to perform linear reciprocating motion. The end of the triggering mechanism is connected to the fourth gas chamber group. A negative pressure switching mechanism is provided within the fourth gas chamber group. The action of the triggering mechanism drives pressure changes within the fourth gas chamber group. These pressure changes drive the negative pressure switching mechanism to control the opening and closing of the vacuum valve.

[0056] The specific way in which the triggering mechanism drives the negative pressure switching mechanism in the fourth gas chamber group to operate can be as follows: the triggering mechanism includes a third drive shaft, which is mechanically driven or manually driven to make linear reciprocating motion to drive the negative pressure switching mechanism in the fourth gas chamber group to operate in order to control the opening and closing of the vacuum valve.

[0057] The specific way in which the triggering mechanism drives the negative pressure switching mechanism in the fourth air chamber group can also be as follows: The triggering mechanism includes a third diaphragm 24 and a third sliding shaft 25. The third diaphragm is located in the third air chamber group. One end of the third sliding shaft is connected to the third diaphragm, and the other end is connected to the third air chamber group. The change in air pressure in the third air chamber group drives the third diaphragm to deform and generate displacement. When the third diaphragm deforms and generates displacement, it can drive the third sliding shaft to move synchronously. The linear reciprocating motion of the third sliding shaft can drive the negative pressure switching mechanism in the fourth air chamber group to control the opening and closing of the vacuum valve.

[0058] The third air chamber group is connected to the liquid surface, and the air pressure of the third air chamber group changes with the liquid level.

[0059] Specifically, such as Figure 5As shown, the third gas chamber group includes gas chambers (A1, A2). Gas chamber A1 is connected to the liquid surface in the well, and gas chamber A2 is connected to the atmosphere. The third diaphragm is located between gas chambers A1 and A2, preventing gas exchange between them. The third sliding shaft is located inside gas chamber A2, with its end extending out of gas chamber A2 (the third sliding shaft moves in a sealed manner with a rubber sealing ring to ensure that gas does not leak due to the movement of the third sliding shaft). It is located within the fourth gas chamber group.

[0060] As the liquid level in the well rises, it will compress the existing air layer in the liquid level detection tube, causing the air layer pressure to rise continuously. This increased air pressure is transmitted to the air chamber A1 through the micro-connecting tube. The continuously compressed air will accumulate in the air chamber A1 and continuously exert force on the third diaphragm, causing the third diaphragm to deform and produce downward displacement. The third diaphragm drives the third sliding axis to move downward.

[0061] To ensure that the deformation of the third diaphragm is controlled and the deformation distance can be effectively transmitted, a third spring 16 is installed in the air chamber A2. The third spring is installed in the air chamber A2 and coaxially on the outer periphery of the third sliding shaft. When the third diaphragm deforms and moves towards the fourth air chamber group, the third spring is used to absorb the thrust of the third diaphragm deformation. When the third diaphragm recovers its deformation, the rebound force of the third spring is used to provide thrust for the third diaphragm to recover its deformation.

[0062] like Figures 5-7 As shown, in this embodiment, the air chamber A5 is equipped with a needle valve 4a.

[0063] The needle valve controls the atmospheric replenishment rate of gas chamber A5, thus preventing the continuous entry of atmosphere from gas chamber A5 into gas chamber A6 when atmospheric channel C is connected. This reduces atmospheric replenishment into gas chamber A6, slowing down the transition of gas chamber A6 to an atmospheric state. Since gas chamber A6 is connected to the vacuum valve, this delays the vacuum valve's closing time. At this point, although the vacuum well has a low liquid level, the vacuum valve remains open, continuously pumping water—essentially fully pumping water and air. This increases the speed of wastewater transport in the vacuum negative pressure pipeline, cleans the vacuum valve plate flow channel with gas, and reduces the chance of vacuum valve clogging. Furthermore, the needle valve makes the vacuum valve's closing time adjustable, allowing operators to set the valve closing time according to the location of the vacuum wells in different vacuum pipelines. Different slow-closing valve actuation times can be set for different situations, such as lower elevations, greater distances from the vacuum station, or multiple vacuum wells installed together, making the vacuum system more flexible and complete.

[0064] The negative pressure switching mechanism includes a fourth diaphragm 21 and a fourth sliding shaft 22. The fourth diaphragm is located inside the third air chamber group. One end of the fourth sliding shaft is connected to the fourth diaphragm, and the other end is connected to the output end of the fourth air chamber group. The action of the triggering mechanism causes a change in the air pressure inside the fourth air chamber group, thereby driving the fourth diaphragm to deform and generate displacement to drive the fourth sliding shaft to move synchronously, thereby realizing the air pressure switching at the output end of the third air chamber group.

[0065] Specifically, such as Figure 5 As shown, the fourth air chamber group includes air chambers (A3, A4, A5, A6, A7). Air chambers A4 and A5 are connected to the atmosphere, and air chamber A7 is connected to a vacuum source. A fourth diaphragm is disposed between air chambers A3 and A4, preventing air from passing between them. A fourth spring 23 is disposed in air chamber A3, and a fourth sliding shaft is disposed in air chamber A4 and connected to the fourth diaphragm, with its end passing through air chamber A5 and located inside air chamber A6.

[0066] Under normal conditions, the end of the third sliding shaft is located in the gas chamber A3 and seals the vacuum channel A, the end of the fourth sliding shaft is located in the gas chamber A6 and seals the vacuum channel B, and the gas chambers A5 and A6 are connected at the atmospheric channel C. At this time, the gas chamber A6 is in an atmospheric state.

[0067] As the well fluid level rises, the third diaphragm deforms and shifts under the pressure of the gas in the gas chamber A1, simultaneously driving the third sliding shaft to move into the gas chamber A3. The end of the third sliding shaft gradually detaches from the vacuum channel A, and vacuum gradually enters the gas chamber A3 from the vacuum channel A, causing the gas chamber A3 to become a vacuum negative pressure state. To prevent the third sliding shaft from separating from the vacuum channel A and rapidly introducing vacuum gas as soon as it moves, a sealed conical protrusion plug is installed on the third sliding shaft to block the vacuum channel A. Only when the third sliding shaft shifts to a certain extent will the plug completely separate from the vacuum channel A.

[0068] When gas chamber A3 is converted to a vacuum negative pressure state, and since gas chamber A4 is in an atmospheric state, the fourth diaphragm deforms and displaces into the interior of gas chamber A3, and drives the fourth sliding shaft to move synchronously. The fourth sliding shaft disengages from the vacuum channel B, the vacuum channel B is opened, and the vacuum in gas chamber A7 enters gas chamber A6. At the same time, the fourth sliding shaft moves to block the atmospheric channel C. At this time, gas chamber A6 is in a vacuum state.

[0069] An atmospheric channel C connects air chambers A5 and A6, and a vacuum channel B connects air chambers A6 and A7. When vacuum channel B is open and atmospheric channel C is closed, the vacuum in air chamber A7 flows into air chamber A6, connecting air chamber A6 to the vacuum valve. At this time, the negative pressure converter can control the vacuum valve to open, and the fourth sliding shaft is located at atmospheric channel C, which is the open position for controlling the vacuum valve. When vacuum channel B is closed and atmospheric channel C is open, the atmosphere in air chamber A5 flows into air chamber A6, connecting air chamber A6 to the vacuum valve. At this time, the negative pressure converter can control the vacuum valve to close, and the fourth sliding shaft is located at vacuum channel B, which is the closed position for controlling the vacuum valve. Therefore, the pressure change in the fourth air chamber group can drive the fourth diaphragm to deform and generate displacement, thereby driving the fourth sliding shaft to move synchronously. The other end of the fourth sliding shaft reciprocates linearly between the open position for controlling the vacuum valve and the closed position for controlling the vacuum valve.

[0070] To ensure that the deformation of the fourth diaphragm is controlled and the deformation distance can be effectively transmitted, a fourth spring 13 is installed in the air chamber A3. When the fourth diaphragm deforms and moves towards the air chamber A3, the fourth spring absorbs the thrust of the fourth diaphragm deformation. When the fourth diaphragm recovers its deformation, the rebound force of the fourth spring provides thrust for the fourth diaphragm to recover its deformation.

[0071] More specifically, such as Figure 5 As shown, the gas chamber A3 has a fine adjustment hole 27 that connects to the atmosphere. The fine adjustment hole is used to continuously supply atmosphere to the gas chamber A3, so that the third gas chamber gradually changes to an atmospheric pressure state. It is worth noting that the fine adjustment hole also continuously supplies a small amount of atmosphere during the process of the gas chamber A3 changing to a vacuum state. Since this small amount of atmosphere is continuously evacuated by the vacuum gas, compared with the amount of vacuum gas entering this gas chamber, the amount of atmosphere introduced through the fine adjustment hole is very small and does not affect the gas chamber changing to a vacuum state.

[0072] Both the vacuum channels (A and B) and the atmospheric channel C have rubber joints, ensuring excellent sealing and preventing gas leakage.

[0073] To ensure that vacuum channel B and atmospheric channel C can accurately align each time the fourth sliding shaft reciprocates and absorb the displacement deviation generated during the operation of the fourth sliding shaft, a sealing conical protrusion plug that cooperates with vacuum channel B and atmospheric channel C is installed on the fourth sliding shaft to block vacuum channel B and atmospheric channel C respectively.

[0074] This embodiment is designed with a fourth gas chamber group and a third gas chamber group. The triggering mechanism in the third gas chamber group drives the negative pressure switching mechanism in the fourth gas chamber group. The gas pressure thrust of the rising liquid level in the vacuum well is sufficient to achieve the gas pressure switching at the output end of the negative pressure converter (the connection end with the vacuum valve) to drive the vacuum valve to open and close.

[0075] Both the fourth diaphragm and the third diaphragm are planar rubber membranes.

[0076] The operation process in this embodiment is as follows:

[0077] The negative pressure converter drives the vacuum valve to open (e.g.) Figure 6 (as shown)

[0078] When the water level in the vacuum well reaches a high level, the gas in the vacuum well's level detection tube is compressed due to the rising water level. This compressed gas is transmitted to the upper interface of the negative pressure trigger converter and enters gas chamber A1. When the water level in the vacuum well reaches a high level W1, the compressed gas also reaches its peak value in gas chamber A1, causing maximum pressure. This results in deformation of the transmission diaphragm. The pressure difference between gas chambers A2 and A1 causes the third diaphragm to deform and displace, which in turn drives the third sliding shaft to move synchronously. The third sliding shaft gradually disengages from vacuum channel A. A small amount of vacuum gas is introduced into chamber A3 and quickly fills the third chamber. Since chamber A4 is connected to the atmosphere and maintains atmospheric pressure, the pressure difference between chambers A3 and A4 causes the fourth diaphragm to deform and displace, which in turn causes the fourth sliding shaft to move synchronously. The fourth sliding shaft blocks the atmospheric passage C to prevent the atmosphere in chamber A5 from entering chamber A6. At the same time, the vacuum passage B is open, and the vacuum gas in chamber A7 is introduced into chamber A6. Chamber A6 is transformed into a vacuum negative pressure state. Connecting chamber A6 to the vacuum valve will open the vacuum valve.

[0079] The negative pressure converter drives the vacuum valve to close (e.g.) Figure 7 As shown):

[0080] When the water level in the vacuum well is at a low level W0, the gas space in the vacuum well level detection tube increases and the gas pressure decreases. The pressure difference between chambers A1 and A2 in the third gas chamber group, which is connected to the negative pressure trigger converter and the liquid surface, decreases. The third diaphragm deforms and tends to flatten. Simultaneously, under the combined action of the third spring's reaction force, the third sliding shaft is driven to return to its original position, blocking the vacuum channel A and preventing vacuum gas from entering chamber A3. Because chamber A3 has a micro-adjustment orifice, atmospheric air is continuously supplied, causing chamber A3 to gradually transition to atmospheric pressure. It is worth noting that this micro-adjustment orifice also continuously supplies a small amount of atmospheric air during the transition of chamber A3 to vacuum. However, this small amount of air is continuously evacuated by the vacuum gas. Compared to the amount of vacuum gas entering the chamber, the amount of air supplied through the micro-adjustment orifice is very small and does not affect the transition of chamber A3 to vacuum. The transition of chamber A3 to atmospheric pressure will also... Since there is no pressure difference between the gas chamber A3 and gas chamber A4, the fourth diaphragm will gradually flatten out as gas chamber A3 returns to atmospheric conditions. Simultaneously, it drives the fourth sliding shaft to move synchronously. The fourth sliding shaft returns to its original position to block the vacuum channel B, cutting off the vacuum supply. At the same time, it opens the atmospheric channel C to allow the atmosphere in gas chamber A5 to replenish gas chamber A6. Since gas chamber A5 is equipped with a needle valve with adjustable flow, the needle valve can control the rate of atmospheric replenishment in gas chamber A5. Thus, when atmospheric channel C is open, it prevents the continuous entry of atmosphere from gas chamber A5 into gas chamber A6. At this time, the needle valve will reduce the atmospheric replenishment into gas chamber A6, making the transition of gas chamber A6 to atmospheric conditions slower. Since gas chamber A6 is connected to the vacuum valve, the closing time of the vacuum valve is delayed. At this time, although the liquid level in the vacuum well is low, the vacuum valve is still open and not closed, maintaining a continuous pumping state, i.e., a state of full pumping of water and air. This increases the speed of sewage transportation in the vacuum negative pressure pipeline, cleans the flow channel of the vacuum valve plate with gas, and reduces the chance of vacuum valve clogging.

[0081] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0082] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0083] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. An on-off converter with delayed closing function, which is connected with a vacuum valve and used for controlling the opening and closing of the vacuum valve, characterized in that: the converter comprises a plurality of air chambers, one of the air chambers is connected with a gas flow adjusting device, and the converter controls the closing time of the vacuum valve through the gas flow adjusting device; the gas flow adjusting device comprises a needle valve; the converter comprises a third air chamber group, a fourth air chamber group and a trigger mechanism, the third air chamber group and the fourth air chamber group are not connected, the trigger mechanism is arranged in the third air chamber group, the linear reciprocating motion of the trigger mechanism is driven by the change of air pressure in the third air chamber group, the trigger mechanism is connected with the fourth air chamber group, a negative pressure switching mechanism is arranged in the fourth air chamber group, the change of air pressure in the fourth air chamber group is driven by the action of the trigger mechanism, and the action of the negative pressure switching mechanism is driven by the change of air pressure in the fourth air chamber group to control the opening and closing of the vacuum valve; the third air chamber group is connected with a liquid surface, and the change of air pressure in the third air chamber group is changed with the change of the liquid level of the liquid surface; the negative pressure switching mechanism comprises a fourth diaphragm and a fourth sliding shaft, the fourth diaphragm is arranged in the fourth air chamber group, one end of the fourth sliding shaft is connected with the fourth diaphragm, the change of air pressure in the fourth air chamber group is caused by the action of the trigger mechanism, thereby driving the fourth diaphragm to deform and displace to drive the fourth sliding shaft to move synchronously, and the other end of the fourth sliding shaft moves linearly between an opening position for controlling the opening of the vacuum valve and a closing position for controlling the closing of the vacuum valve; the trigger mechanism comprises a third diaphragm and a third sliding shaft, the third diaphragm is arranged in the third air chamber group, one end of the third sliding shaft is connected with the third diaphragm, and the other end of the third sliding shaft is connected with the fourth air chamber group, the third diaphragm is deformed and displaced by the change of air pressure in the third air chamber group, and the third diaphragm drives the third sliding shaft to move synchronously when the third diaphragm is deformed and displaced; the third air chamber group comprises an air chamber one and an air chamber two, the air chamber one is connected with a liquid surface in a well, the air chamber two is connected with the atmosphere, the third diaphragm is arranged between the air chamber one and the air chamber two and makes the air chamber one and the air chamber two not communicate with each other, and the third sliding shaft is arranged in the air chamber two and its end penetrates out of the air chamber two and is located in the fourth air chamber group; a third spring is arranged in the air chamber two, and the third spring is arranged coaxially on the outer periphery of the third sliding shaft; the fourth air chamber group comprises an air chamber three, an air chamber four, an air chamber five, an air chamber six and an air chamber seven, the air chamber four and the air chamber five are connected with the atmosphere, the air chamber seven is connected with a vacuum source, the fourth diaphragm is arranged between the air chamber three and the air chamber four and makes the air chamber three and the air chamber four not communicate with each other, the fourth spring is arranged in the air chamber three, the fourth sliding shaft is arranged in the air chamber four and connected with the fourth diaphragm, and the end of the fourth sliding shaft penetrates through the air chamber five and is located in the air chamber six; the air chamber five is provided with a needle valve. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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