A vacuum sewage discharge control system with adjustable starting pressure

Abstract

The present invention relates to the technical field of sewage wells, and specifically discloses a vacuum sewage discharge control system with adjustable starting pressure, including a liquid level sensing valve, a driving valve, a liquid level sensing pipe, a sewage discharge pipe, a vacuum sewage discharge valve and a negative pressure source, wherein a diaphragm assembly is arranged in the liquid level sensing valve, and the internal space of the liquid level sensing valve is divided into an atmospheric chamber and a sensing chamber distributed vertically by the diaphragm assembly, a first valve core assembly is arranged in the atmospheric chamber of the liquid level sensing valve, a second valve core assembly is arranged in the driving valve, and the internal space of the driving valve is divided into a pressure control chamber and an overpressure chamber distributed vertically by the second valve core assembly. The present invention has a mechanical control structure, saves electric energy, and is more environmentally friendly. The function of constant pressure starting ensures that the system can only start sewage discharge when the negative pressure is sufficient, and also ensures the smoothness of sewage discharge, avoiding poor sewage discharge under low negative pressure and pipeline blockage.

Description

Technical Field

[0001] The invention relates to the technical field of sewage wells, and in particular to a vacuum sewage discharge control system with adjustable starting pressure. Background Art

[0002] The vacuum drain valve is a valve that connects the user end and the vacuum pipe network in the vacuum control system. The vacuum drain system needs to control the opening and closing of the vacuum drain valve to achieve the drainage and closing of the vacuum pipe network. The control unit of the vacuum drain valve is particularly important. Whether it is an indoor vacuum drainage system or an outdoor vacuum drainage system, the control unit needs a signal source, and the purely mechanical control system does not require electricity. Its signal is completed by mechanical action, such as using changes in water pressure or air pressure as a signal.

[0003] In a vacuum drainage system, the control unit generally controls the vacuum drain valve to open upon receiving a signal. As a result, during peak usage periods, when multiple vacuum drain terminals are opened at the same time, the system's vacuum degree will decrease, the vacuum state will be unstable, and the system vacuum degree will be easily too low. The vacuum drain valve will not open widely, and the drainage will be poor. Some vacuum terminals may even fail to operate due to the loss of negative pressure caused by water hydrants in the system, resulting in partial paralysis of the vacuum drain system. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a vacuum sewage discharge control system with adjustable starting pressure. The condition for starting the control system is not only a signal input, but also the negative pressure of the system must reach a specified value. This ensures that when the negative pressure is sufficient, the vacuum sewage discharge valve can be fully opened and the sewage can be discharged smoothly.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A vacuum sewage discharge control system with adjustable starting pressure, comprising a liquid level sensing valve, a driving valve, a liquid level sensing tube, a sewage discharge tube, a vacuum sewage discharge valve and a negative pressure source, wherein a diaphragm assembly is arranged in the liquid level sensing valve, and the internal space of the liquid level sensing valve is divided into an atmospheric chamber and a sensing chamber distributed in an upper and lower manner by the diaphragm assembly, a first valve core assembly is arranged in the atmospheric chamber of the liquid level sensing valve, a second valve core assembly is arranged in the driving valve, and the internal space of the driving valve is divided into a pressure control chamber and an overpressure chamber distributed in an upper and lower manner by the second valve core assembly, the sensing chamber of the liquid level sensing valve is communicated with the liquid level sensing tube through the first valve core assembly, the atmospheric chamber of the liquid level sensing valve is communicated with the pressure control chamber and the overpressure chamber of the driving valve through the first valve core assembly respectively, and the top of the liquid level sensing valve is provided with an external atmospheric port communicated with the atmospheric chamber;

[0007] The second valve core assembly includes a partition and a sealing frame for opening and closing the second negative pressure interface, the partition is fixedly installed on the inner wall of the driving valve, the sealing frame is movably installed in the overpressure chamber of the partition, a first return spring is installed between the top end of the sealing frame and the bottom end of the partition, a main shaft is penetrated and slidably installed between the partition and the sealing frame, a trapezoidal notch is provided on the side wall of the middle part of the main shaft, a first retaining spring is provided on the bottom side wall of the main shaft, the first retaining spring is located below the sealing frame, a magnetic attraction assembly is provided on the top end of the main shaft, a driving membrane group for adjusting the position of the main shaft is provided in the driving valve, an air hole is provided on the side wall of the driving valve, and the height of the air hole is located between the partition and the driving membrane group;

[0008] The magnetic attraction assembly includes a magnet column, which is slidably installed on the top of the main shaft. The top wall of the driving valve is provided with a limiting sleeve. The main shaft is slidably sleeved in the limiting sleeve. A second magnet ring is slidably installed on the outer wall of the limiting sleeve. An adjusting device for adjusting the starting pressure is provided on the top of the driving valve.

[0009] Preferably, the bottom wall of the liquid level sensing valve is provided with a sensing air nozzle communicating with the sensing chamber, and the sensing air nozzle is connected with the liquid level sensing tube through a pipeline.

[0010] Preferably, the top wall of the atmospheric cavity of the liquid level sensing valve is provided with a first negative pressure interface and a driving interface, the driving valve is provided with a second negative pressure interface and a sewage interface communicated with the overpressure chamber, the top wall of the driving valve is provided with a sensing interface communicated with the pressure control chamber, the sewage interface is communicated with the vacuum sewage valve interface through a pipeline, the first negative pressure interface is communicated with the second negative pressure interface and the negative pressure source respectively through pipelines, and the driving interface is communicated with the sensing interface through a pipeline.

[0011] Preferably, the first valve core assembly includes an iron core, a limiting cylinder is provided on the top wall of the liquid level sensing valve, the first negative pressure interface and the driving interface are both in communication with the limiting cylinder, a built-in atmospheric port is provided at the bottom end of the limiting cylinder, the iron core is slidably installed in the limiting cylinder, two flat grooves are provided on the circumferential side walls of the iron core, a drainage channel is formed between the flat grooves of the iron core and the limiting cylinder, and a second reset spring is provided between the bottom wall of the limiting cylinder and the bottom end of the iron core.

[0012] Preferably, the diaphragm assembly includes a sensing diaphragm, the sensing diaphragm is installed in the liquid level sensing valve, a magnet sleeve is provided on the top of the sensing diaphragm, a first magnet ring is sleeved in the magnet sleeve, and the first magnet ring matches the iron core.

[0013] Preferably, a first shaft seal is disposed on the inner wall of the partition, and the first shaft seal matches the main shaft. A second shaft seal is disposed on the inner wall of the sealing frame, and the second shaft seal matches the main shaft.

[0014] Preferably, a VA water seal is provided on the outer wall of the sealing frame, and the VA water seal matches the bottom wall of the driving valve.

[0015] Preferably, the driving diaphragm group includes a pressure differential diaphragm, a second retaining spring is provided on the side wall of the main shaft, the pressure differential diaphragm is installed in the driving valve, the main shaft and the pressure differential diaphragm are penetrated, and a push-pull disk is installed between the pressure differential diaphragm and the second retaining spring.

[0016] Preferably, the adjusting device includes a lifting plate, which is slidably sleeved on the outer wall of the limiting sleeve, the bottom end of the lifting plate is fixedly connected to the top of the second magnet ring, the lifting plate is clamped with an adjusting knob, the adjusting knob is threadedly connected to the driving valve, and the top of the driving valve is provided with a dust plug for rotating the adjusting knob.

[0017] Preferably, a hexagonal column is provided at the bottom end of the dust plug, and a hexagonal hole is provided at the top end of the adjusting knob, and the hexagonal column of the dust plug matches the hexagonal hole of the adjusting knob.

[0018] The beneficial effects of the present invention are:

[0019] 1. By setting the liquid level sensing valve and the driving valve, the beneficial effect that can be obtained is that the liquid level sensing tube in the floor drain or vacuum water collection well is in a sealed state. When the water level in the floor drain or vacuum water collection well rises, the gas in the upper part of the liquid level sensing tube will be compressed, and the air pressure will gradually increase. When the air pressure reaches a certain level, the sensing diaphragm in the liquid level sensing valve pushes the first magnet ring to move upward to a certain position, and the iron core of the liquid level sensing valve is instantly sucked down by the magnetic force, the built-in air port in the liquid level sensing valve is sealed, and the first negative pressure interface is opened. At this time, the first negative pressure interface in the liquid level sensing valve and the driving valve The second negative pressure interface is connected, the negative pressure source draws negative pressure on the limit cylinder through the first negative pressure interface, and the gas in the pressure control chamber of the driving valve flows from the sensing interface to the driving interface. The sensing interface of the driving valve is in a negative pressure state, then the pressure control chamber in the driving valve is in a negative pressure state, the driving valve is started, the pressure difference diaphragm, the push-pull disk and the second retaining spring drive the main shaft to slide upward, and cooperate with the first retaining spring to drive the sealing skeleton to slide upward, the pressure control chamber of the driving valve is disconnected from the flow chamber, the VA water seal is separated from the negative pressure interface, the second negative pressure interface is opened, the vacuum drain valve interface is connected to the second negative pressure interface, and the vacuum drain When the sewage valve is in a negative pressure state, the vacuum sewage valve is opened, and the water in the floor drain or vacuum water collection well begins to be discharged. After the discharge is completed, the water level in the liquid level sensing tube in the floor drain or vacuum water collection well drops, and the air pressure in the liquid level sensing tube drops. At the same time, the air pressure in the sensing chamber of the liquid level sensing valve drops. Then the first magnet ring moves downward and away from the iron core. The iron core loses its downward magnetic force and recovers instantly under the action of the second reset spring at its lower end, sealing the first negative pressure interface above again and opening the built-in atmospheric port at the same time. At this time, the sensing interface of the drive valve is connected to the external atmospheric port again. The pressure control chamber in the drive valve also returns to the atmospheric state, the pressure differential diaphragm in the drive valve loses the pressure differential, and the spindle moves downward under the suction of the second magnet ring and the magnet column inside it, and the VA water seal seals the second negative pressure interface again. Secondly, the trapezoidal notch in the middle of the spindle returns to the position of the first shaft seal again, and the atmospheric chamber of the drive valve and the flow chamber are connected again through the trapezoidal notch of the spindle. The vacuum drain valve interface is connected to the atmosphere, and the vacuum drain valve returns to the atmospheric state again, that is, the vacuum drain valve is closed, and a drain cycle ends. It has a mechanical control structure, saves electricity, and is more environmentally friendly.

[0020] 2. By setting the adjustment device, the beneficial effect that can be obtained is that in the application of the vacuum sewage discharge system, the drive valve has the function of constant pressure start-up, and the suction force of the second magnet ring and the magnet column in the drive valve is certain, so the force to push the magnet column is also certain. Only when the negative pressure in the pressure control chamber reaches the specified value, the pressure difference diaphragm can pull the push-pull plate so that the main shaft overcomes the suction force of the second magnet ring and the magnet column and moves upward. If the negative pressure is too low, even if the liquid level sensing valve has been started, the drive valve cannot be opened. By adjusting the adjustment knob in the drive valve to move downward, the lifting plate can drive the second magnet ring away from the magnet column, thereby reducing the magnetic force of the two for a period of time and reducing the starting pressure. When the adjustment knob in the drive valve moves upward, the second magnet ring will also move upward, and the second magnet ring will approach the magnet column, increasing the magnetic force of the two for a period of time and increasing the starting pressure. The function of constant pressure start-up ensures that the system can only start sewage discharge when the negative pressure is sufficient, and also ensures the smoothness of sewage discharge, avoiding poor sewage discharge under low negative pressure and pipeline blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is an installation structure diagram of the liquid level sensing valve in the present invention;

[0024] Figure 3 It is a front view of the driving valve in the present invention;

[0025] Figure 4 is a side view of the driving valve in the present invention;

[0026] Figure 5 This is a diagram of the initial state of the liquid level sensing valve in the present invention;

[0027] Figure 6 This is a start-up state diagram of the liquid level sensing valve in the present invention;

[0028] Figure 7 This is a structural diagram of the iron core of the present invention;

[0029] Figure 8 is a diagram of the initial state of the driving valve in the present invention;

[0030] Fig. 9 This is a start-up state diagram of the driving valve in the present invention;

[0031] Fig.10 It is a diagram of the pressurized state of the regulating device in the present invention;

[0032] Fig.11 It is a decompression structure diagram of the regulating device in the present invention.

[0033] Description of reference numerals:

[0034] In the figure: 1, liquid level sensing valve; 11, external air port; 12, first negative pressure interface; 13, drive interface; 14, induction air nozzle; 15, limit cylinder; 16, built-in air port; 2, drive valve; 21, second negative pressure interface; 22, induction interface; 23, sewage interface; 24, partition; 25, first return spring; 26, sealing frame; 27, main shaft; 28, first retaining spring; 31, iron core; 32, second return spring Spring; 33, sensing diaphragm; 34, magnet sleeve; 35, first magnet ring; 41, second retaining spring; 42, differential pressure diaphragm; 43, push-pull plate; 44, first shaft seal; 45, second shaft seal; 46, VA water seal; 51, magnet column; 52, limit sleeve; 53, second magnet ring; 54, lifting plate; 55, adjusting knob; 56, dust plug; 6, liquid level sensing tube; 7, drain pipe; 8, vacuum drain valve; 9, negative pressure source. DETAILED DESCRIPTION

[0035] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are clearly and completely described below in combination with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present application, it should be understood that the orientation or position relationship indicated by "inside", "outside", etc. is based on the orientation or position described in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, a specific orientation structure and operation, and therefore cannot be understood as a limitation on the present application.

[0037] Reference Figure 1-Figure 11, which is a vacuum sewage discharge control system with adjustable starting pressure disclosed by the present invention, comprising a liquid level sensing valve 1, a driving valve 2, a liquid level sensing pipe 6, a sewage discharge pipe 7, a vacuum sewage discharge valve 8 and a negative pressure source 9, wherein a diaphragm assembly is arranged in the liquid level sensing valve 1, and the internal space of the liquid level sensing valve 1 is divided into an atmospheric chamber and a sensing chamber distributed in an upper and lower manner by the diaphragm assembly, a first valve core assembly is arranged in the atmospheric chamber of the liquid level sensing valve 1, a second valve core assembly is arranged in the driving valve 2, and the internal space of the driving valve 2 is divided into a pressure control chamber and an overpressure chamber distributed in an upper and lower manner by the second valve core assembly, The sensing chamber of the liquid level sensing valve 1 is communicated with the liquid level sensing tube 6 through a pipeline, and the atmospheric chamber of the liquid level sensing valve 1 is communicated with the pressure control chamber and the overpressure chamber of the drive valve 2 through the first valve core component respectively. The bottom wall of the liquid level sensing valve 1 is provided with a sensing air nozzle 14 communicated with the sensing chamber, and the sensing air nozzle 14 is connected with the liquid level sensing tube 6 through a pipeline. The top of the liquid level sensing valve 1 is provided with an external atmospheric port 11 communicated with the atmospheric chamber, and the top wall of the atmospheric chamber of the liquid level sensing valve 1 is provided with a first negative pressure interface 12 and a drive interface 13, and the drive valve 2 is provided with a negative pressure interface 12 and a drive interface 13 connected with the overpressure chamber. The second negative pressure interface 21 and the sewage interface 23 are connected, the top wall of the driving valve 2 is provided with a sensing interface 22 which is communicated with the pressure control chamber, the sewage interface 23 is communicated with the interface of the vacuum sewage valve 8 through a pipeline, the first negative pressure interface 12 is communicated with the second negative pressure interface 21 and the negative pressure source 9 respectively through a pipeline, the driving interface 13 is communicated with the sensing interface 22 through a pipeline, the first valve core assembly includes an iron core 31, and a limit cylinder 15 is provided on the top wall of the liquid level sensing valve 1, the first negative pressure interface 12 and the driving interface 13 are both communicated with the limit cylinder 15, and the bottom of the limit cylinder 15 is provided with a built-in atmospheric Port 16, the built-in atmospheric port 16 is communicated with the external atmospheric port 11, the iron core 31 is slidably installed in the limiting cylinder 15, the circumferential side wall of the iron core 31 is provided with two flat grooves, a drainage channel is formed between the flat grooves of the iron core 31 and the limiting cylinder 15, a second reset spring 32 is provided between the bottom wall of the limiting cylinder 15 and the bottom end of the iron core 31, the diaphragm assembly includes a sensing diaphragm 33, the sensing diaphragm 33 is installed in the liquid level sensing valve 1, the top of the sensing diaphragm 33 is provided with a magnet sleeve 34, the magnet sleeve 34 is sleeved with a first magnet ring 35, and the first magnet ring 35 matches the iron core 31.

[0038] The second valve core assembly includes a partition 24 and a sealing frame 26 for opening and closing the second negative pressure interface 21. The partition 24 is fixedly installed on the inner wall of the driving valve 2, and the sealing frame 26 is movably installed in the overpressure chamber of the partition 24. A first return spring 25 is installed between the top end of the sealing frame 26 and the bottom end of the partition 24. A main shaft 27 is penetrated and slidably installed between the partition 24 and the sealing frame 26. A trapezoidal notch is provided on the side wall of the middle part of the main shaft 27. A first retaining spring 28 is provided on the bottom side wall of the main shaft 27. The first retaining spring 28 is located below the sealing frame 26. A first shaft seal 44 is provided on the inner wall of the partition 24. The first shaft seal 44 is connected to the main shaft 27. Matching, a second shaft seal 45 is arranged on the inner wall of the sealing skeleton 26, and the second shaft seal 45 matches the main shaft 27. A VA water seal 46 is arranged on the outer wall of the sealing skeleton 26, and the VA water seal 46 matches the bottom wall of the driving valve 2. A driving membrane group for adjusting the position of the main shaft 27 is arranged in the driving valve 2, and the driving membrane group includes a pressure difference diaphragm 42. A second retaining spring 41 is arranged on the side wall of the main shaft 27. The pressure difference diaphragm 42 is installed in the driving valve 2. The main shaft 27 and the pressure difference diaphragm 42 are arranged through, and a push-pull disk 43 is installed between the pressure difference diaphragm 42 and the second retaining spring 41. The side wall of the driving valve 2 is provided with an air hole, and the height of the air hole is located between the partition 24 and the driving membrane group.

[0039] A magnetic attraction component is provided at the top of the main shaft 27, and the magnetic attraction component includes a magnet column 51, which is fixedly installed on the top of the main shaft 27. A limit sleeve 52 is provided on the top wall of the drive valve 2. The main shaft 27 is slidably sleeved in the limit sleeve 52, and a second magnet ring 53 is slidably installed on the outer wall of the limit sleeve 52. An adjusting device for adjusting the starting pressure is provided on the top of the drive valve 2. The adjusting device includes a lifting plate 54, which is slidably sleeved on the outer wall of the limit sleeve 52, and the bottom end of the lifting plate 54 is fixedly connected to the top of the second magnet ring 53. The lifting plate 54 is clamped with an adjusting knob 55, and the adjusting knob 55 is threadedly connected to the drive valve 2. A dust plug 56 for rotating the adjusting knob 55 is provided at the top of the drive valve 2, and a hexagonal prism is provided at the bottom end of the dust plug 56, and a hexagonal hole is provided at the top of the adjusting knob 55. The hexagonal prism of the dust plug 56 matches the hexagonal hole of the adjusting knob 55.

[0040] The working principle and use process of the present invention are as follows: in the initial state where there is no water in the floor drain or vacuum water collection well, the sensing chamber of the liquid level sensing valve 1 connected to the liquid level sensing tube 6 is in a normal pressure state, and the internal first magnet ring 35 is away from the iron core 31, and the iron core 31 seals the first negative pressure interface 12. At this time, the external atmospheric port 11 is communicated with the driving interface 13 through the built-in atmospheric port 16 on the limiting cylinder 15, and the driving interface 13 is communicated with the sensing interface 22 of the driving valve 2, and the sensing interface 22 of the driving valve 2 is in an atmospheric state, so the pressure control chamber of the driving valve 2 is in an atmospheric state, the drain interface 23 in the driving valve 2 is communicated with the atmospheric chamber, the vacuum drain valve 8 is in an atmospheric state, the vacuum drain valve 8 is not opened, and the liquid level sensing tube 6 in the floor drain or vacuum water collection well is sealed. In the sealed state, when the water level in the floor drain or vacuum water collection well rises, the gas in the upper part of the liquid level sensing tube 6 will be compressed, and the air pressure will gradually increase. When the air pressure reaches a certain level, the sensing diaphragm 33 in the liquid level sensing valve 1 pushes the first magnet ring 35 to move upward to a certain position, and the iron core 31 of the liquid level sensing valve 1 is instantly sucked down by the magnetic force, and the built-in atmospheric port 16 in the liquid level sensing valve 1 is sealed, and the first negative pressure interface 12 is opened. At this time, the first negative pressure interface 12 in the liquid level sensing valve 1 is connected to the second negative pressure interface 21 of the drive valve 2, and the negative pressure source 9 pumps negative pressure on the limit cylinder 15 through the first negative pressure interface 12, and the gas in the pressure control chamber of the drive valve 2 flows from the sensing interface 22 to the drive interface 13. The sensing interface 22 of the drive valve 2 is in a negative pressure state, then the drive valve 2 The pressure control chamber in the movable valve 2 is in a negative pressure state, the driving valve 2 is started, the pressure difference diaphragm 42, the push-pull plate 43 and the second retaining spring 41 drive the main shaft 27 to slide upward, and cooperate with the first retaining spring 28 to drive the sealing frame 26 to slide upward, the pressure control chamber of the driving valve 2 is disconnected from the flow chamber, the VA water seal 46 seal is separated from the negative pressure interface, the second negative pressure interface 21 is opened, the vacuum drain valve 8 interface is connected to the second negative pressure interface 21, the vacuum drain valve 8 is in a negative pressure state, then the vacuum drain valve 8 is opened, and the water in the floor drain or vacuum water collection well begins to be discharged. After the discharge is completed, the water level in the liquid level sensing tube 6 in the floor drain or vacuum water collection well drops, and the air pressure in the liquid level sensing tube 6 drops. Synchronously, the air pressure in the sensing chamber in the liquid level sensing valve 1 drops, then the first magnet The ring 35 moves downward and away from the iron core 31. The iron core 31 loses its downward magnetic force and recovers instantly under the action of the second return spring 32 at its lower end, sealing the first negative pressure interface 12 above again and opening the built-in atmospheric port 16 at the same time. At this time, the sensing interface 22 of the drive valve 2 is connected to the external atmospheric port 11 again, and the pressure control chamber in the drive valve 2 is also restored to the atmospheric state. The pressure differential diaphragm 42 in the drive valve 2 loses the pressure differential. The spindle 27 moves downward under the action of the suction force of the second magnet ring 53 and the magnet column 51 inside it, and the VA water seal 46 seals the second negative pressure interface 21 again. Secondly, the trapezoidal notch in the middle of the spindle 27 returns to the position of the first shaft seal 44 again, and the atmospheric chamber and the flow chamber of the drive valve 2 are connected again through the trapezoidal notch of the spindle 27.The interface of the vacuum drain valve 8 is connected to the atmosphere, and the vacuum drain valve 8 returns to the atmospheric state again, that is, the vacuum drain valve 8 is closed, and a drain cycle ends. In the application of the vacuum drain system, the drive valve 2 has the function of constant pressure start-up. The suction force of the second magnet ring 53 and the magnet column 51 in the drive valve 2 is certain, so the force to push the magnet column 51 is also certain. Only when the negative pressure in the pressure control chamber reaches a specified value, the pressure differential diaphragm 42 can pull the push-pull disk 43 to make the spindle 27 overcome the suction force of the second magnet ring 53 and the magnet column 51 and move upward. The negative pressure is too low, even if the liquid level sensing valve 1 has When starting, the driving valve 2 cannot be opened. The function of constant pressure starting ensures that the system can start to discharge sewage only when the negative pressure is sufficient, and also ensures the smoothness of sewage discharge, avoiding poor sewage discharge and pipeline blockage under low negative pressure. By adjusting the adjustment knob 55 in the driving valve 2 to move downward, the lifting plate 54 can drive the second magnet ring 53 away from the magnet column 51, thereby reducing the magnetic force between the two and reducing the starting pressure. When the adjustment knob 55 in the driving valve 2 moves upward, the second magnet ring 53 will also move upward, and the second magnet ring 53 will be close to the magnet column 51, increasing the magnetic force between the two and increasing the starting pressure.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A vacuum sewage discharge control system with adjustable starting pressure, characterized in that: The invention comprises a liquid level sensing valve (1), a driving valve (2), a liquid level sensing tube (6), a drain pipe (7), a vacuum drain valve (8) and a negative pressure source (9), wherein a diaphragm assembly is arranged in the liquid level sensing valve (1), and the internal space of the liquid level sensing valve (1) is divided into an atmospheric chamber and a sensing chamber distributed in an upper and lower manner by the diaphragm assembly, a first valve core assembly is arranged in the atmospheric chamber of the liquid level sensing valve (1), and a second valve core assembly is arranged in the driving valve (2), and the internal space of the driving valve (2) is divided into a pressure control chamber and an overpressure chamber distributed in an upper and lower manner by the second valve core assembly, the sensing chamber of the liquid level sensing valve (1) is communicated with the liquid level sensing tube (6) through the first valve core assembly, and the atmospheric chamber of the liquid level sensing valve (1) is communicated with the pressure control chamber and the overpressure chamber of the driving valve (2) through the first valve core assembly respectively, and the top of the liquid level sensing valve (1) is provided with an external atmospheric port (11) communicated with the atmospheric chamber; The second valve core assembly comprises a partition (24) and a sealing frame (26) for opening and closing the second negative pressure interface (21); the partition (24) is fixedly mounted on the inner wall of the driving valve (2); the sealing frame (26) is movably mounted in the overpressure chamber of the partition (24); a first return spring (25) is mounted between the top end of the sealing frame (26) and the bottom end of the partition (24); a main shaft (25) is penetrated and slidably mounted between the partition (24) and the sealing frame (26); 7), a trapezoidal notch is provided on the side wall of the middle part of the main shaft (27), a first retaining spring (28) is provided on the bottom side wall of the main shaft (27), the first retaining spring (28) is located below the sealing frame (26), a magnetic attraction component is provided on the top of the main shaft (27), a driving membrane group for adjusting the position of the main shaft (27) is provided in the driving valve (2), and an air hole is provided on the side wall of the driving valve (2), the height of the air hole is located between the partition (24) and the driving membrane group; The magnetic attraction assembly comprises a magnet column (51), the magnet column (51) is slidably mounted on the top of the main shaft (27), a limit sleeve (52) is provided on the top wall of the drive valve (2), the main shaft (27) is slidably sleeved in the limit sleeve (52), a second magnet ring (53) is slidably mounted on the outer wall of the limit sleeve (52), and an adjustment device for adjusting the starting pressure is provided on the top of the drive valve (2); The top wall of the atmospheric cavity of the liquid level sensing valve (1) is provided with a first negative pressure interface (12) and a driving interface (13); the driving valve (2) is provided with a second negative pressure interface (21) and a sewage discharge interface (23) which are in communication with the overpressure chamber; the top wall of the driving valve (2) is provided with a sensing interface (22) which is in communication with the pressure control chamber; the sewage discharge interface (23) is in communication with an interface of a vacuum sewage discharge valve (8) via a pipeline; the first negative pressure interface (12) is in communication with the second negative pressure interface (21) and a negative pressure source (9) respectively via a pipeline; and the driving interface (13) is in communication with the sensing interface (22) via a pipeline; The first valve core assembly comprises an iron core (31), a limiting cylinder (15) is arranged on the top wall of the liquid level sensing valve (1), the first negative pressure interface (12) and the driving interface (13) are both in communication with the limiting cylinder (15), a built-in air port (16) is arranged at the bottom end of the limiting cylinder (15), the iron core (31) is slidably mounted in the limiting cylinder (15), two flat grooves are arranged on the circumferential side wall of the iron core (31), a drainage channel is formed between the flat grooves of the iron core (31) and the limiting cylinder (15), and a second return spring (32) is arranged between the bottom wall of the limiting cylinder (15) and the bottom end of the iron core (31).

2. A vacuum sewage discharge control system with adjustable starting pressure according to claim 1, characterized in that: The bottom wall of the liquid level sensing valve (1) is provided with a sensing air nozzle (14) which is in communication with the sensing chamber, and the sensing air nozzle (14) is connected with the liquid level sensing tube (6) through a pipeline.

3. A vacuum sewage discharge control system with adjustable starting pressure according to claim 1, characterized in that: The diaphragm assembly comprises a sensing diaphragm (33), the sensing diaphragm (33) being installed in a liquid level sensing valve (1), a magnet sleeve (34) being provided at the top end of the sensing diaphragm (33), a first magnet ring (35) being sleeved in the magnet sleeve (34), and the first magnet ring (35) being matched with the iron core (31).

4. A vacuum sewage discharge control system with adjustable starting pressure according to claim 1, characterized in that: A first shaft seal (44) is provided on the inner wall of the partition (24), and the first shaft seal (44) matches the main shaft (27). A second shaft seal (45) is provided on the inner wall of the sealing frame (26), and the second shaft seal (45) matches the main shaft (27).

5. The vacuum sewage discharge control system with adjustable starting pressure according to claim 1, characterized in that: A VA water seal (46) is provided on the outer wall of the sealing frame (26), and the VA water seal (46) matches the bottom wall of the driving valve (2).

6. A vacuum sewage discharge control system with adjustable starting pressure according to claim 1, characterized in that: The driving diaphragm group comprises a pressure differential diaphragm (42), a second retaining spring (41) is provided on the side wall of the main shaft (27), the pressure differential diaphragm (42) is installed in the driving valve (2), the main shaft (27) and the pressure differential diaphragm (42) are arranged to penetrate each other, and a push-pull disk (43) is installed between the pressure differential diaphragm (42) and the second retaining spring (41).

7. The vacuum sewage discharge control system with adjustable starting pressure according to claim 1, characterized in that: The regulating device comprises a lifting plate (54), the lifting plate (54) being slidably sleeved on the outer wall of the limiting sleeve (52), the bottom end of the lifting plate (54) being fixedly connected to the top end of the second magnet ring (53), the lifting plate (54) being clamped with an regulating knob (55), the regulating knob (55) being threadedly connected to the driving valve (2), and a dust plug (56) for rotating the regulating knob (55) being provided at the top end of the driving valve (2).

8. A vacuum sewage discharge control system with adjustable starting pressure according to claim 7, characterized in that: A hexagonal prism is provided at the bottom end of the dust plug (56), and a hexagonal hole is provided at the top end of the adjusting knob (55), and the hexagonal prism of the dust plug (56) matches the hexagonal hole of the adjusting knob (55).

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