Air pressure type blowdown device

Abstract

The utility model discloses an air pressure type blowdown device which comprises a lifter main body provided with a sewage treatment cavity, the lifter main body is provided with a water inlet and a water outlet, the lifter main body is provided with a driving device and a switching device, and the switching device is in control connection with the driving device; the switch device comprises a switch box, an air pressure sensing switch assembly and an electric control board are hermetically arranged in the switch box, the switch box is provided with a first air pressure chamber and a second air pressure chamber, the bottoms of the first air pressure chamber and the second air pressure chamber are communicated with the sewage treatment cavity, and the bottom of the first air pressure chamber is higher than that of the second air pressure chamber; when the air pressure sensing switch assembly detects that the air pressure in the first air pressure chamber and the second air pressure chamber rises simultaneously, the air pressure sensing switch assembly controls the driving device to start through the electric control board. The device has the effects of effectively preventing the driving device from being started by mistake and realizing accurate starting and stopping of equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage lift pumps, and particularly relates to a pneumatic sewage discharge device. Background Art

[0002] Sewage lift pumps are mainly used for lifting sewage at low water levels, and are used to lift and transport waste sewage that is lower than the sewer or far from the municipal pipe network, which can effectively solve or avoid the problems existing in traditional sumps.

[0003] A Chinese patent with the publication number CN205224256U discloses a fully automatic pressure relief sewage lift pump, which includes a box body. An inlet and an outlet are provided on the box body, and the inlet and the outlet are respectively connected to an inlet pipe and an outlet pipe. The feature is that a controller is provided on the box body. The inlet end of the outlet pipe is connected to a submersible sewage pump, and the submersible sewage pump is electrically connected to the controller. A liquid level sensor is provided inside the box body, a pressure sensor is provided on the inner wall of the top of the box body, a pressure relief pipe is connected to the top of the box body, and a solenoid valve is provided on the pressure relief pipe. The liquid level sensor, the pressure sensor, and the solenoid valve are respectively electrically connected to the controller.

[0004] However, the above sewage lift pump has the following disadvantages: The sewage lift pump uses a liquid level sensor and a pressure sensor to respectively collect the liquid level height information and pressure information inside the box body and send them to the controller. The controller sends information to the submersible sewage pump and the solenoid valve according to the liquid level height information and pressure information. When the liquid level inside the box body reaches a certain height, the submersible sewage pump starts to work to lift the sewage out of the box body. However, it detects the pressure information inside the box body by setting a single pressure sensor, and the pressure information detection method is relatively single, and it is easy to have the situation of incorrect pressure judgment, which needs to be improved urgently. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a pneumatic sewage discharge device, which has the effects of effectively preventing the driving device from being accidentally started and realizing the accurate start and stop of the equipment.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: A pneumatic sewage discharge device includes a lift pump main body provided with a sewage treatment chamber. The lift pump main body is provided with an inlet and an outlet, and the lift pump main body is provided with a driving device and a switching device, and the switching device is controllably connected to the driving device;

[0007] The switch device includes a switch box, in which a pneumatic pressure sensing switch assembly and an electronic control board are hermetically arranged. The switch box is provided with a first pneumatic chamber and a second pneumatic chamber. The bottoms of the first pneumatic chamber and the second pneumatic chamber are communicated with the sewage treatment chamber, and the bottom height of the first pneumatic chamber is higher than that of the second pneumatic chamber. When the pneumatic pressure sensing switch assembly detects that the air pressures in the first pneumatic chamber and the second pneumatic chamber rise simultaneously, the pneumatic pressure sensing switch assembly controls the driving device to start through the electronic control board.

[0008] By adopting the above technical solution, sewage flows into the sewage treatment chamber of the lifter main body through the water inlet, causing the liquid level in the sewage treatment chamber to gradually rise. When the liquid level in the sewage treatment chamber rises into the first pneumatic chamber, the air pressure in the first pneumatic chamber gradually increases. The pneumatic pressure sensing switch assembly detects the pressure increase signal in the first pneumatic chamber. Then, the liquid level in the sewage treatment chamber continues to rise into the second pneumatic chamber, causing the air pressure in the second pneumatic chamber to gradually increase. The pneumatic pressure sensing switch assembly detects the pressure increase signal in the second pneumatic chamber, so that the sewage liquid level in the lifter main body reaches the threshold value. The switch device feeds back to control the driving device to crush the impurities in the sewage treatment chamber and guide them to the water outlet for discharge. When the liquid level in the sewage treatment chamber is continuously discharged, its liquid level gradually drops. When the liquid level in the sewage treatment chamber drops below the bottom position of the first pneumatic chamber, the pneumatic pressure sensing switch assembly controls the driving device to stop through the electronic control board. In the present utility model, by setting the first pneumatic chamber and the second pneumatic chamber with different bottom water inlet heights, and using the pneumatic pressure sensing switch assembly to simultaneously detect the air pressure changes in the first pneumatic chamber and the second pneumatic chamber, and then feeding back to control the start and stop of the driving device. And only when the sewage meets the condition of simultaneously overflowing the first pneumatic chamber and the second pneumatic chamber, can the driving device be started, which can effectively prevent the driving device from being mis-started due to the air pressure fluctuation in a single pneumatic chamber. At the same time, the start water level and the stop water level are also separated, which is conducive to the pneumatic pressure sensing switch assembly accurately detecting and controlling the height of the water level, and has the effects of effectively preventing the driving device from being mis-started and realizing the accurate start and stop of the equipment.

[0009] A further setting of the present utility model is that the pneumatic pressure sensing switch assembly includes a first pneumatic switch and a second pneumatic switch hermetically arranged in the switch box. The first pneumatic switch is used to detect the air pressure change in the first pneumatic chamber, and the second pneumatic switch is used to detect the air pressure change in the second pneumatic chamber.

[0010] By adopting the above technical solution, different from the situation that it is easy to have incorrect detection when using one pneumatic switch to simultaneously detect the first pneumatic chamber and the second pneumatic chamber, the present utility model adopts independently arranged first and second pneumatic switches to respectively detect the air pressure changes in the first pneumatic chamber and the second pneumatic chamber, and can realize accurate detection of the air pressures in the first pneumatic chamber and the second pneumatic chamber.

[0011] A further setting of the present utility model is that: several horizontal partitions and vertical partitions are provided in the switch box, and the several horizontal partitions and vertical partitions divide the inner cavity of the switch box into a sealed installation chamber, the first air pressure chamber, and the second air pressure chamber. A first through hole is penetrated and opened on one of the horizontal partitions between the first air pressure chamber and the sealed installation chamber, and a second through hole is penetrated and opened on another horizontal partition between the second air pressure chamber and the sealed installation chamber. The air pressure detection head of the first pneumatic switch is hermetically arranged in the first through hole, and the air pressure detection head of the second pneumatic switch is hermetically arranged in the second through hole.

[0012] By adopting the above technical solution, it is possible to effectively prevent air leakage and water leakage in the sealed installation chamber, and further effectively prevent the first pneumatic switch and the second pneumatic switch in the sealed installation chamber from short - circuiting or having air pressure inter - communication.

[0013] A further setting of the present utility model is that: the horizontal partition is coaxially extended with an installation sleeve corresponding to the first through hole and the second through hole, and the air pressure detection heads of the first pneumatic switch and the second pneumatic switch are hermetically arranged in the corresponding installation sleeves.

[0014] By adopting the above technical solution, the installation firmness of the air pressure detection heads of the first pneumatic switch and the second pneumatic switch can be effectively improved, and further the air leakage and water leakage prevention performance of the device can be improved.

[0015] A further setting of the present utility model is that: the switch box is fixedly provided with a pressing plate, the pressing plate is symmetrically provided with pressing grooves, and the pressing plate is in pressing cooperation with the corresponding first pneumatic switch and second pneumatic switch through the pressing grooves.

[0016] By adopting the above technical solution, by using the pressing and positioning function of the pressing grooves of the pressing plate and the first pneumatic switch and the second pneumatic switch, the anti - sway performance of the first pneumatic switch and the second pneumatic switch during installation in the switch box can be effectively improved.

[0017] A further setting of the present utility model is that: anti - detachment parts are symmetrically arranged on both sides of the pressing plate. When the pressing plate presses the first pneumatic switch and the second pneumatic switch onto the switch box, the pressing plate is in anti - detachment cooperation with the corresponding first pneumatic switch and second pneumatic switch through the anti - detachment parts.

[0018] By adopting the above technical solution, by using the anti - detachment parts, the pressing firmness of the pressing plate on the first pneumatic switch and the second pneumatic switch can be improved, and the situation that the first pneumatic switch and the second pneumatic switch are detached from both sides of the pressing plate can be prevented.

[0019] A further setting of the present utility model is that: the lifter main body is provided with an installation hole corresponding to the switch box, the two sides of the switch box are symmetrically provided with buckles, the lifter main body is provided with clamping grooves communicated on both sides of the installation hole, and the buckles are clamped and matched with the clamping grooves.

[0020] By adopting the above technical solution, the switch box can be detachably installed on the lifter main body, which is beneficial to improving the disassembly and assembly convenience of the switch box on the lifter main body.

[0021] A further setting of the present utility model is that: the lifter main body is provided with an upper cover, and the upper cover is provided with a touch switch controlled and connected to the electronic control board.

[0022] By adopting the above technical solution, the manual on-off of the electronic control board can be realized by pressing the touch switch.

[0023] A further setting of the present utility model is that: a support rod is arranged radially in the inner cavity of the switch box, lugs are symmetrically arranged on both sides of the switch box, and both ends of the support rod are respectively in supporting cooperation with the corresponding lugs.

[0024] By adopting the above technical solution, the addition of the support rod can improve the radial support of the switch box, thereby improving the radial anti-deformation ability of the switch box. In addition, the switch box can be rotated by rotating the support rod, so that the buckle of the switch box is disengaged from the corresponding clamping groove of the lifter main body, and thus the switch box 31 can be pulled out, which is convenient for replacing or repairing parts.

[0025] In summary, the present utility model has the following beneficial effects:

[0026] A driving device and a switch device are arranged in a lifter main body provided with a sewage treatment chamber. The switch device includes a switch box, in which a pneumatic induction switch assembly and an electronic control board are hermetically arranged. The switch box is provided with a first air pressure chamber and a second air pressure chamber communicated with the sewage treatment chamber. Sewage flows into the sewage treatment chamber of the lifter main body through the water inlet, causing the liquid level in the sewage treatment chamber to gradually rise. When the liquid level in the sewage treatment chamber rises into the first air pressure chamber, the air pressure in the first air pressure chamber gradually increases. The pneumatic induction switch assembly detects the pressure increase signal in the first air pressure chamber. Then, the liquid level in the sewage treatment chamber continues to rise into the second air pressure chamber, causing the air pressure in the second air pressure chamber to gradually increase. The pneumatic induction switch assembly detects the pressure increase signal in the second air pressure chamber, so that the sewage liquid level in the lifter main body reaches the threshold value. The switch device feeds back and controls the driving device to crush the impurities in the sewage treatment chamber and guide them to the water outlet for discharge. When the liquid level in the sewage treatment chamber is continuously discharged, its liquid level gradually drops. When the liquid level in the sewage treatment chamber drops below the bottom position of the first air pressure chamber, the pneumatic induction switch assembly controls the driving device to stop through the electronic control board. By setting the first air pressure chamber and the second air pressure chamber with different bottom water inlet heights, and using the pneumatic induction switch assembly to detect the air pressure changes in the first air pressure chamber and the second air pressure chamber at the same time, and then feeding back and controlling the start and stop of the driving device. And only when the sewage meets the condition of overflowing the first air pressure chamber and the second air pressure chamber at the same time, can the driving device be started, which can effectively prevent the driving device from being accidentally started due to the air pressure fluctuation of a single air pressure chamber, and has the effect of effectively preventing the driving device from being accidentally started and realizing the precise start and stop of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the structural diagram of the present invention.

[0028] Figure 2 is the longitudinal sectional view of the present invention.

[0029] Figure 3 is the present invention Figure 2 partial enlarged view of area A in.

[0030] Figure 4 is another longitudinal sectional view of the present invention.

[0031] Figure 5 is the present invention Figure 4 partial enlarged view of area B in.

[0032] Figure 6 is the structural diagram of the switch device.

[0033] Figure 7 is the exploded view of the switch device.

[0034] In the figure: 1. Lifter main body; 10. Sewage treatment chamber; 1a. Water inlet; 1b. Water outlet; 1c. Mounting hole; 1d. Card slot; 11. Upper cover; 111. Touch switch; 2. Driving device; 21. Biaxial motor; 22. Crushing blade; 23. Impeller; 3. Switch device; 31. Switch box; 31a. First air pressure chamber; 31b. Second air pressure chamber; 31c. Sealed mounting chamber; 32. Air pressure induction switch assembly; 321. First pneumatic switch; 322. Second pneumatic switch; 33. Electric control board; 331. Capacitor; 34. Horizontal partition; 34a. First through hole; 34b. Second through hole; 341. Mounting sleeve; 35. Vertical partition; 36. Pressing plate; 36a. Pressing groove; 361. Anti - detachment part; 37. Buckle; 38. Lug; 4. Support rod. Detailed implementation mode

[0035] The present utility model will be further described below with reference to the accompanying drawings.

[0036] A pneumatic sewage discharge device, as Figures 1-4 shown, includes a lifter main body 1 provided with a sewage treatment chamber 10. The lifter main body 1 is provided with a water inlet 1a and a water outlet 1b. The lifter main body 1 is provided with a driving device 2 and a switch device 3. The switch device 3 is connected to the driving device 2 for control; the switch device 3 includes a switch box 31. An air pressure induction switch assembly 32 and an electric control board 33 are hermetically arranged in the switch box 31. The electric control board 33 is electrically connected to a capacitor 331. The switch box 31 is provided with a first air pressure chamber 31a and a second air pressure chamber 31b. The bottoms of the first air pressure chamber 31a and the second air pressure chamber 31b are communicated with the sewage treatment chamber 10. The air pressure induction switch assembly 32 is used to detect the air pressure changes in the first air pressure chamber 31a and the second air pressure chamber 31b, and the bottom height of the first air pressure chamber 31a is higher than the bottom height of the second air pressure chamber 31b; when the air pressure induction switch assembly 32 detects that the air pressures in the first air pressure chamber 31a and the second air pressure chamber 31b rise simultaneously, the air pressure induction switch assembly 32 controls the driving device 2 to start through the electric control board 33; the lifter main body 1 is provided with an upper cover 11. The upper cover 11 is provided with a touch switch 111 connected to the electric control board 33 for control. The electric control board 33 can be manually powered on and off by pressing the touch switch 111.

[0037] As Figures 2-7As shown, the elevator main body 1 is provided with an installation hole 1c corresponding to the switch box 31. The two sides of the switch box 31 are symmetrically provided with buckles 37. The elevator main body 1 is communicated with clamping grooves 1d on both sides of the installation hole 1c. The buckles 37 are clamped and matched with the clamping grooves 1d, so that the switch box 31 can be detachably installed on the elevator main body 1, which is beneficial to improving the disassembly and assembly convenience of the switch box 31 on the elevator main body 1; a support rod 4 is arranged radially in the inner cavity of the switch box 31. The two sides of the switch box 31 are symmetrically provided with lug ears 38. The two ends of the support rod 4 are respectively supported and matched with the corresponding lug ears 38. The addition of the support rod 4 can improve the radial support of the switch box 31, thereby improving the radial anti-deformation ability of the switch box 31. In addition, the switch box 31 can be rotated by rotating the support rod 4, so that the buckle 37 of the switch box 31 is disengaged from the corresponding clamping groove 1d of the elevator main body 1, so that the switch box 31 can be pulled out, which is convenient for replacing or repairing parts; the driving device 2 in this embodiment includes a double-shaft motor 21, a crushing blade 22 arranged at the first output end of the double-shaft motor 21, and an impeller 23 arranged at the second output end of the double-shaft motor 21. The double-shaft motor 21 drives the crushing blade 22 to rotate at a high speed to crush the impurities in the sewage treatment chamber 10, and the impeller 23 rotates to guide the treated impurities and sewage in the sewage treatment chamber 10 to the water outlet 1b.

[0038] As Figures 4-7As shown in the figure, the air pressure sensing switch assembly 32 includes a first pneumatic switch 321 and a second pneumatic switch 322 that are hermetically installed in the switch box 31. The first pneumatic switch 321 is used to detect the air pressure change in the first air pressure chamber 31a, and the second pneumatic switch 322 is used to detect the air pressure change in the second air pressure chamber 31b. Different from the situation where using one pneumatic switch to detect the first air pressure chamber 31a and the second air pressure chamber 31b simultaneously is prone to false detection, the present utility model adopts the independently arranged first pneumatic switch 321 and second pneumatic switch 322 to respectively detect the air pressure changes in the first air pressure chamber 31a and the second air pressure chamber 31b, which can achieve accurate detection of the air pressure in the first air pressure chamber 31a and the second air pressure chamber 31b. There are several horizontal partitions 34 and vertical partitions 35 in the switch box 31. The several horizontal partitions 34 and vertical partitions 35 divide the inner cavity of the switch box 31 into a sealed installation chamber 31c, a first air pressure chamber 31a, and a second air pressure chamber 31b. A first through hole 34a is penetrated through a horizontal partition 34 between the first air pressure chamber 31a and the sealed installation chamber 31c, and a second through hole 34b is penetrated through another horizontal partition 34 between the second air pressure chamber 31b and the sealed installation chamber 31c. The air pressure detection head of the first pneumatic switch 321 is hermetically installed in the first through hole 34a, and the air pressure detection head of the second pneumatic switch 322 is hermetically installed in the second through hole 34b, which can effectively prevent water leakage and air leakage in the sealed installation chamber 31c, and further effectively prevent the first pneumatic switch 321 and the second pneumatic switch 322 in the sealed installation chamber 31c from short-circuiting or having air pressure intercommunication. The horizontal partition 34 is coaxially extended with installation sleeves 341 corresponding to the first through hole 34a and the second through hole 34b. The air pressure detection heads of the first pneumatic switch 321 and the second pneumatic switch 322 are hermetically installed in the corresponding installation sleeves 341, which can effectively improve the installation firmness of the air pressure detection heads of the first pneumatic switch 321 and the second pneumatic switch 322, and further improve the water leakage and air leakage prevention performance of the device.

[0039] As Figures 3-6As shown in the figure, the switch box 31 is fixedly provided with a pressing plate 36. The pressing plate 36 is symmetrically provided with pressing grooves 36a. The pressing plate 36 is in pressing cooperation with the corresponding first pneumatic switch 321 and second pneumatic switch 322 through the pressing grooves 36a. By using the pressing and positioning effect of the pressing grooves 36a of the pressing plate 36 on the first pneumatic switch 321 and second pneumatic switch 322, the anti-shaking property of the first pneumatic switch 321 and second pneumatic switch 322 during installation in the switch box 31 can be effectively improved; both sides of the pressing plate 36 are symmetrically provided with anti-disengagement portions 361. When the pressing plate 36 presses the first pneumatic switch 321 and second pneumatic switch 322 onto the switch box 31, the pressing plate 36 is in anti-disengagement cooperation with the corresponding first pneumatic switch 321 and second pneumatic switch 322 through the anti-disengagement portions 361. By using the anti-disengagement portions 361, the pressing firmness of the pressing plate 36 on the first pneumatic switch 321 and second pneumatic switch 322 can be improved, and the situation where the first pneumatic switch 321 and second pneumatic switch 322 disengage from both sides of the pressing plate 36 can be prevented.

[0040] The basic working principle of the present utility model is as follows: A driving device 2 and a switch device 3 are arranged in a lifter main body 1 provided with a sewage treatment chamber 10. The switch device 3 includes a switch box 31. An air pressure sensing switch assembly 32 and an electronic control board 33 are hermetically arranged in the switch box 31. The switch box 31 is provided with a first air pressure chamber 31a and a second air pressure chamber 31b communicated with the sewage treatment chamber 10. Sewage flows into the sewage treatment chamber 10 of the lifter main body 1 through a water inlet 1a, causing the liquid level in the sewage treatment chamber 10 to gradually rise. When the liquid level in the sewage treatment chamber 10 rises into the first air pressure chamber 31a, the air pressure in the first air pressure chamber 31a gradually increases. The air pressure sensing switch assembly 32 detects the pressure increase signal in the first air pressure chamber 31a. Then the liquid level in the sewage treatment chamber 10 continues to rise into the second air pressure chamber 31b, causing the air pressure in the second air pressure chamber 31b to gradually increase. The air pressure sensing switch assembly 32 detects the pressure increase signal in the second air pressure chamber 31b, so that the sewage liquid level in the lifter main body 1 reaches a threshold value. The switch device 3 feeds back and controls the driving device 2 to crush the impurities in the sewage treatment chamber 10 and guide them to a water outlet 1b for discharge. When the liquid level in the sewage treatment chamber 10 is continuously discharged, its liquid level gradually drops. When the liquid level in the sewage treatment chamber 10 drops below the bottom position of the first air pressure chamber 31a, the air pressure sensing switch assembly 32 controls the driving device 2 to stop running through the electronic control board 33. By providing the first air pressure chamber 31a and the second air pressure chamber 31b with different heights of the bottom water inlet 1a, the present utility model utilizes the air pressure sensing switch assembly 32 to simultaneously detect the air pressure changes in the first air pressure chamber 31a and the second air pressure chamber 31b, and then feeds back and controls the start and stop of the driving device 2. And only when the sewage meets the condition of simultaneously overflowing the first air pressure chamber 31a and the second air pressure chamber 31b can the driving device 2 be started, which can effectively prevent the driving device 2 from being accidentally started due to the air pressure fluctuation of a single air pressure chamber. At the same time, the starting water level and the stopping water level are also separated, which is beneficial for the air pressure sensing switch assembly 32 to accurately detect and control the height of the water level, having the effects of effectively preventing the driving device from being accidentally started and realizing the accurate start and stop of the equipment, and having the effects of effectively preventing the driving device 2 from being accidentally started and realizing the accurate start and stop of the equipment.

[0041] The above is only the preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present utility model are included in the scope of the patent application of the present utility model.

Claims

1. A pneumatic sewage discharge device, comprising a lifter body (1) with a sewage treatment chamber (10), the lifter body (1) having a water inlet (1a) and a water outlet (1b), characterized in that: The lifter body (1) is provided with a driving device (2) and a switch device (3), and the switch device (3) is controllably connected to the driving device (2); The switch device (3) comprises a switch box (31), wherein an air pressure sensing switch assembly (32) and an electric control board (33) are sealed inside the switch box (31), wherein the switch box (31) is provided with a first air pressure chamber (31a) and a second air pressure chamber (31b), wherein the bottoms of the first air pressure chamber (31a) and the second air pressure chamber (31b) are connected to the sewage treatment chamber (10), and the bottom height of the first air pressure chamber (31a) is higher than the bottom height of the second air pressure chamber (31b); when the air pressure sensing switch assembly (32) detects that the air pressures in the first air pressure chamber (31a) and the second air pressure chamber (31b) increase simultaneously, the air pressure sensing switch assembly (32) controls the drive device (2) to start through the electric control board (33).

2. A pneumatic sewage discharge device according to claim 1, characterized in that: The air pressure sensing switch assembly (32) comprises a first pneumatic switch (321) and a second pneumatic switch (322) which are sealed in the switch box (31); the first pneumatic switch (321) is used to detect changes in air pressure in the first air pressure chamber (31a); and the second pneumatic switch (322) is used to detect changes in air pressure in the second air pressure chamber (31b).

3. A pneumatic sewage discharge device according to claim 2, characterized in that: The switch box (31) is provided with a plurality of transverse partitions (34) and vertical partitions (35), and the plurality of transverse partitions (34) and vertical partitions (35) divide the inner cavity of the switch box (31) into a sealed installation chamber (31c) and the first air pressure chamber (31a) and a second air pressure chamber (31b). A first through hole (34a) is provided on one transverse partition (34) between the first air pressure chamber (31a) and the sealed installation chamber (31c), and a second through hole (34b) is provided on another transverse partition (34) between the second air pressure chamber (31b) and the sealed installation chamber (31c). The air pressure detection head of the first pneumatic switch (321) is sealed in the first through hole (34a), and the air pressure detection head of the second pneumatic switch (322) is sealed in the second through hole (34b).

4. A pneumatic sewage discharge device according to claim 3, characterized in that: The transverse partition (34) has a mounting sleeve (341) extending coaxially corresponding to the first through hole (34a) and the second through hole (34b), and the air pressure detection heads of the first pneumatic switch (321) and the second pneumatic switch (322) are sealed in the corresponding mounting sleeve (341).

5. A pneumatic sewage discharge device according to claim 2, characterized in that: The switch box (31) is fixedly provided with a pressing plate (36), and the pressing plate (36) is symmetrically provided with pressing grooves (36a). The pressing plate (36) is pressed and matched with the corresponding first pneumatic switch (321) and second pneumatic switch (322) through the pressing grooves (36a).

6. A pneumatic sewage discharge device according to claim 5, characterized in that: Anti-slip parts (361) are symmetrically provided on both sides of the pressing plate (36). When the pressing plate (36) presses the first pneumatic switch (321) and the second pneumatic switch (322) onto the switch box (31), the pressing plate (36) cooperates with the corresponding first pneumatic switch (321) and the second pneumatic switch (322) in an anti-slip manner through the anti-slip parts (361).

7. A pneumatic sewage discharge device according to claim 1, characterized in that: The lifter body (1) is provided with a mounting hole (1c) corresponding to the switch box (31), buckles (37) are symmetrically provided on both sides of the switch box (31), and the lifter body (1) is provided with a clamping groove (1d) on both sides of the mounting hole (1c), and the buckle (37) is clamped and matched with the clamping groove (1d).

8. A pneumatic sewage discharge device according to claim 1, characterized in that: The lifter body (1) is provided with an upper cover (11), and the upper cover (11) is provided with a touch-pressure switch (111) which is controllably connected to the electric control panel (33).

9. A pneumatic sewage discharge device according to claim 1, characterized in that: A support rod (4) is radially arranged in the inner cavity of the switch box (31), lugs (38) are symmetrically arranged on both sides of the switch box (31), and two ends of the support rod (4) are respectively supported and matched with the lugs (38).

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