CN212336213U - Vacuum sewage discharge system - Google Patents

Abstract

The utility model relates to a vacuum sewage system, which comprises a closestool body, a flushing pipeline system arranged in the closestool body, a time delay controller, an air filter, an air control water valve and a vacuum sewage valve; the flushing pipeline system comprises a water inlet pipeline which penetrates through the pneumatic control water valve and extends into the closestool body, and a vacuum sewer pipeline which penetrates through the vacuum blowdown valve from the closestool body and extends outwards; the time delay controller is provided with an atmosphere pipeline interface connected with the air filter, a vacuum pipeline interface connected with a vacuum sewer pipeline through a one-way vacuum valve, a first air channel interface connected with the pneumatic control water valve and a second air channel interface connected with the vacuum blowdown valve; the utility model can avoid the gas pressure difference adopted abroad to carry out transduction when the vacuum sewage disposal system discharges sewage, and does not need other control modes and energy types such as an electromagnetic valve, a battery, solar energy, wind energy and the like, and the investment cost is low; meanwhile, the structure design is compact, the space occupancy rate is small, the types and the number of parts are small, and the reliability is high.

Description

Vacuum sewage discharge system

Technical Field

The utility model relates to a drainage technical field of vacuum lavatory relevant equipment, in particular to vacuum drainage.

Background

The vacuum sewage system is characterized in that the alternation of partial vacuum and atmospheric pressure in the controller chamber is switched to realize the opening (working state) and the closing (non-working state) of the vacuum sewage valve and the flushing water valve, wherein the control device plays an important role, and the control process of the control device is as follows: the vacuum waste valve is operated such that feces or other gaseous and liquid solids in the vacuum toilet are discharged from the vacuum toilet related equipment to a vacuum collection device (e.g., an intermediate receptacle, a following vacuum waste tank) or a vacuum sewer, while the flush water valve is operated such that flush water is flushed through the vacuum toilet related equipment cavity related chamber.

The prior art already has a vacuum toilet related control device, which mainly has the following defects:

(1) each unit in the control device is relatively independent, the number of elements is large, the specification number is large, individual parts are movable parts which are matched with other parts, the structural size is small, and the parts are easy to damage, so that the controller is complex in structure, high in cost, short in service life, low in reliability, and high in manufacturing and maintenance cost;

(2) after the device is assembled, the time delay time cannot be manually adjusted, and function selection cannot be realized;

(3) certain air is sucked from the outer side of a gap between the manual button rod and a matching hole of the device due to the action of negative pressure, and heavy pollutants such as dust in the air can enter a negative pressure chamber through the matching gap and further attach to parts in the device, so that the action failure of related parts is caused, and the action precision is further influenced;

(4) the easy mistake action that has appeared because pressure differential fluctuation arouses diaphragm subassembly pressure differential unstability, if add and store up the pressure jar, then increased product space and product cost among the intangible to and the fault rate, consequently the utility model discloses developed a vacuum sewage system to solve the problem that exists among the prior art, through the retrieval, not discover with the utility model discloses same or similar technical scheme.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose is: the utility model provides a vacuum sewage system to solve among the prior art vacuum sewage system inner structure design unreasonable occupation space big, input cost and maintenance cost are too high, functional poor, and easily lead to the problem that the precision is poor and the fault rate is high.

The technical scheme of the utility model is that: a vacuum sewage system comprises a toilet body, a flushing pipeline system arranged in the toilet body, a delay controller for controlling the working of the flushing pipeline system, an air filter connected with the delay controller, a pneumatic control water valve and a vacuum sewage valve; the flushing pipeline system comprises a water inlet pipeline which penetrates through the pneumatic control water valve and extends into the closestool body, and a vacuum sewer pipeline which penetrates through the vacuum blowdown valve from the closestool body and extends outwards; the time delay controller is provided with an atmosphere pipeline interface connected with the air filter, a vacuum pipeline interface connected with the vacuum sewer pipeline through the one-way vacuum valve, a first air channel interface connected with the pneumatic control water valve and a second air channel interface connected with the vacuum blowdown valve.

Preferably, the time delay controller comprises a housing, a large flush button assembly and a small flush button assembly which are arranged in the housing, a diaphragm assembly and a slide valve assembly which respectively and independently control the large flush button assembly and the small flush button assembly to realize piston movement, and a pair of needle valve assemblies and a pair of check valve assemblies which are arranged in the housing.

Preferably, the shell comprises a pair of first cavity, second cavity and third cavity arranged from top to bottom in sequence; the upper ends of the first cavities are provided with hollow connecting shafts communicated with each other; a first inner hole communicated with the second cavity is formed between the second cavity and the first cavity, and a second inner hole communicated with the third cavity and the second cavity is formed between the third cavity and the second cavity; the vacuum pipeline interface is communicated with the second cavity, and the atmosphere pipeline interface, the first air path interface and the second air path interface are arranged below the shell and are communicated with the third cavity; the large flushing button assembly and the small flushing button assembly are identical in structure and are symmetrically installed, and each large flushing button assembly and each small flushing button assembly comprise a button and a first return spring, wherein the button penetrates through the hollow connecting shaft, the first cavity and the first inner hole in sequence and extends into the second cavity, and the first return spring is sleeved on the button and is positioned on the inner side and the outer side of the first cavity; the diaphragm assembly is arranged in the second cavity and comprises an upper pressure plate, a diaphragm, a lower pressure plate and a second return spring, wherein the upper pressure plate, the diaphragm and the lower pressure plate are sequentially arranged from top to bottom, and the second return spring is arranged below the lower pressure plate; the sliding valve assembly is fixedly connected with the lower pressing plate, penetrates through the second inner hole, extends into the third cavity, and comprises a valve rod, a valve clack fixedly connected with the lower end of the valve rod and a sealing pressing plate; the valve clack is arranged in the third cavity and is coaxial with the atmospheric pipeline interface; the needle valve assembly and the check valve assembly are arranged at the upper end of the shell and are respectively communicated with the first cavity, and the needle valve assembly comprises a needle valve core for controlling the flow rate of gas entering the first cavity; the check valve assembly comprises a steel ball, a compression spring and an inner adjusting screw, wherein the steel ball, the compression spring and the inner adjusting screw are used for enabling gas to flow out of the first cavity.

Preferably, the pneumatic control water valve is provided with a third air path interface, a water inlet and a water outlet, the third air path interface is connected with the first air path interface, and the water inlet pipeline is communicated with the water inlet and the water outlet.

Preferably, the vacuum blowoff valve is provided with a fourth gas path interface, a sewage inlet and a sewage outlet, the fourth gas path interface is connected with the second gas path interface, and the vacuum sewer pipeline is communicated with the sewage inlet and the sewage outlet.

Compared with the prior art, the utility model has the advantages that:

(1) the utility model applies the time delay controller in the vacuum sewage system, so that the vacuum sewage system avoids the gas pressure difference adopted abroad for transduction during sewage discharge, and other control modes and energy types such as an electromagnetic valve, a battery, solar energy, wind energy and the like are not needed, and the investment cost is low; meanwhile, the structure design is compact, the space occupancy rate is small, the types and the number of parts are small, and the reliability is high.

(2) When the time delay controller is operated, the function can be selected, and the double control button consisting of the large flushing button assembly and the small flushing button assembly is designed, so that the time delay controller has the function of selecting the large flushing mode (such as defecation) and the small flushing mode (such as urine)

(3) The large flush mode has certain interlocking and anti-misoperation (fool-proof) functions, and the small flush mode has regret functions, which are suitable for primary users unfamiliar with the use of the toilet and old users with misoperation.

(4) Due to the large flushing mode and the small flushing mode triggered by the double control buttons and the regret function, the structure can realize high-efficiency water saving.

Drawings

The invention will be further described with reference to the following drawings and examples:

fig. 1 is a schematic structural view of a vacuum sewage system according to the present invention;

fig. 2 is a schematic structural diagram of the delay controller of the present invention;

fig. 3 is a cross-sectional view of the delay controller of the present invention;

fig. 4 is a schematic view of the arrangement structure of the large and small flush button assemblies according to the present invention;

fig. 5 is a view from a-a of the delay controller of the present invention;

fig. 6 is a schematic view of the arrangement structure of the diaphragm assembly and the slide valve assembly according to the present invention;

fig. 7 is a schematic view of the needle valve assembly and the check valve assembly of the present invention.

Wherein: 1. a toilet body;

11. a toilet lid;

2. a flush line system;

21. a water inlet pipeline 22, a vacuum sewer pipeline 23 and a one-way vacuum valve;

3. a delay controller;

31. a shell body 32, a large flushing button assembly 33, a small flushing button assembly 34, a diaphragm assembly 35, a sliding valve assembly 36, a needle valve assembly 37 and a one-way valve assembly;

310. the first cavity 311, the second cavity 312, the third cavity 313, the hollow connecting shaft 314, the first inner hole 315, the second inner hole 316, the vacuum pipeline interface 317, the atmosphere pipeline interface 318, the first air path interface 319 and the second air path interface;

320. a push button 321, a first return spring 322, a piston portion 323, a first air pipe 324, a second air pipe 325, a third air pipe 326 and a fourth air pipe;

341. the upper pressure plate 342, the diaphragm 343, the lower pressure plate 344 and the second return spring;

351. a valve rod 352, a valve clack 353 and a sealing pressure plate;

361. a needle valve core 362, an adjusting knob 363 and a conical end head;

371. a steel ball 372, a compression spring 373 and an inner adjusting screw;

4. an air filter;

5. a pneumatic control water valve;

51. a third gas path interface 52, a water inlet 53 and a water outlet;

6. a vacuum blowoff valve;

61. a fourth air passage interface 62, a sewage inlet 63 and a sewage outlet;

Detailed Description

The following detailed description is made in conjunction with specific embodiments of the present invention:

as shown in fig. 1, a vacuum sewage system comprises a toilet body 1, a flushing pipeline system 2 installed in the toilet body 1, a time delay controller 3 for controlling the operation of the flushing pipeline system 2, an air filter 4 connected with the time delay controller 3, an air control water valve 5 and a vacuum sewage valve 6; the upper end of the closestool body 1 is provided with a turnover closestool cover 11; the flushing pipeline system 2 comprises a water inlet pipeline 21 which penetrates through the pneumatic control water valve 5 and extends into the closestool body 1, and a vacuum sewer pipeline 22 which penetrates through the vacuum blowdown valve 6 from the closestool body 1 and extends outwards; the time delay controller 3 is provided with an atmosphere pipeline interface 317 connected with the air filter 4, a vacuum pipeline interface 316 connected with the vacuum sewer pipeline 22 through the one-way vacuum valve 23, a first air channel interface 318 connected with the air control water valve 5 and a second air channel interface 319 connected with the vacuum blowdown valve 6.

As shown in fig. 2 and 3, the delay controller 3 includes a housing 31, a large flush button assembly 32 and a small flush button assembly 33 which are installed in the housing 31, a diaphragm assembly 34 and a spool assembly 35 which are respectively and independently controlled by the large flush button assembly 32 and the small flush button assembly 33 to realize piston movement, and a pair of needle valve assemblies 36 and a pair of check valve assemblies 37 which are installed in the housing 31.

As shown in fig. 3, the housing 31 includes a pair of first, second and third cavities 310, 311 and 312 sequentially arranged from top to bottom; a hollow connecting shaft 313 communicated with the upper ends of the first cavities 310 is arranged at the upper ends of the first cavities; a first inner hole 314 communicated with the first cavity 310 is arranged between the second cavity 311 and the first cavity 310, and a second inner hole 315 communicated with the third cavity 312 and the second cavity 311; the vacuum pipeline interface 316 is communicated with the second cavity 311, and the atmosphere pipeline interface 317, the first air path interface 318 and the second air path interface 319 are arranged below the shell 31 and are communicated with the third cavity 312; wherein, the hollow connecting shaft 313, the first cavity 310 and the first inner hole 314 are coaxially arranged and used for installing the large flushing button assembly 32 and the small flushing button assembly 33; the second cavity 311, the second bore 315, the third cavity 312 and the atmosphere connection 317 are coaxially disposed for mounting the diaphragm assembly 34 and the spool valve assembly 35.

As shown in fig. 4, the large flush button assembly 32 and the small flush button assembly 33 are installed symmetrically and have the same structure, and include a button 320 sequentially passing through the hollow connecting shaft 313, the first cavity 310 and the first inner hole 314 and extending into the second cavity 311, and a first return spring 321 sleeved on the button 320 and located inside and outside the first cavity 310; the button 320 further includes a piston portion 322 in the first cavity 310, and a first return spring 321 is disposed below the piston portion 322; as shown in fig. 5, a first air pipe 323 communicating with the first cavity 310 is provided above the piston portion 322; a second air pipe 324 and a third air pipe 325 are arranged below the piston 322 and communicated with the first cavity 310, wherein a fourth air pipe 326 is arranged at the side of the third air pipe 325 and communicated with the first air pipe.

As shown in fig. 6, the diaphragm assembly 34 and the sliding valve assembly 35 are assembled to form an integral structure, and can be driven by the large flush button assembly 32 and the small flush button assembly 33 to realize a piston motion, wherein the diaphragm assembly 34 is disposed in the second cavity 311, and includes an upper pressing plate 341, a diaphragm 342, a lower pressing plate 343, and a second return spring 344 disposed below the lower pressing plate 343, which are sequentially disposed from top to bottom, and a through hole is disposed on an end surface of the diaphragm 342; the sliding valve assembly 35 is fixedly connected with the lower pressing plate 343, and extends into the third cavity 312 through the second inner hole 315, and includes a valve rod 351, a valve flap 352 fixedly connected with the lower end of the valve rod 351, and a sealing pressing plate 353; the second return spring 344 is sleeved outside the valve rod 351, the valve rod 351 penetrates through the second inner hole 315 and extends into the third cavity 312, and a plurality of gaps arranged along the vertical direction are formed in the outer wall attached to the second inner hole 315; the valve flap 352 is disposed within the third cavity 312 and is disposed coaxially with the atmospheric line port 317; a sealing pressure plate 353 is fixed to the upper end of the valve flap 352 and blocks the second cavity 311 from the third cavity 312 when moving to the uppermost end.

A pair of needle valve assemblies 36 and check valve assemblies 37 are disposed at the upper end of the housing 31 and respectively communicate with the first cavity 310, wherein the needle valve assemblies 36 are installed in the third air pipe 325, and the check valve assemblies 37 are installed in the second air pipe 324; as shown in fig. 7, the needle valve assembly 36 includes a needle valve spool 361 for controlling the flow rate of the gas entering the first cavity 310, the needle valve spool 361 has an adjusting knob 362 at the outer end and a tapered end 363 at the inner end, the tapered end 363 extends to the inner end where the third air pipe 325 and the fourth air pipe 326 meet, and the size of a tapered gap formed between the tapered end 363 and the side wall of the third air pipe 325 can be controlled by screwing the adjusting knob 362, so as to control the flow rate; the check valve assembly 37 is used for realizing the outflow of gas from the first cavity 310, and the structure thereof comprises a steel ball 371, a compression spring 372 and an inner adjusting screw 373 which are sequentially arranged from inside to outside, the steel ball 371 plays a role in blocking in a normal state, the middle part of the inner adjusting screw 373 is also provided with a gas outlet channel, and under a high pressure state, high-pressure gas pushes the steel ball 371 and flows out from the gas outlet channel.

In this embodiment, the detailed structure of the delay controller 3 can refer to the chinese patent with patent number 202010655551.7, namely a spring damping delay control device for vacuum toilet related equipment.

As shown in fig. 1, the pneumatic water control valve 5 is provided with a third air path interface 51, a water inlet 52 and a water outlet 53, the third air path interface 51 is connected with the first air path interface 318, and the water inlet pipeline 21 is communicated with the water inlet 52 and the water outlet 53; the vacuum blowoff valve 6 is provided with a fourth air passage interface 61, a sewage inlet 62 and a sewage outlet 63, the fourth air passage interface 61 is connected with the second air passage interface 319, and the vacuum sewer pipeline 22 is communicated with the sewage inlet 62 and the sewage outlet 63; after the third air path interface 51 and the fourth air path interface 61 are vacuumized, the pneumatic control water valve 5 and the vacuum blowdown valve 6 can be opened, and the vacuum blowdown system can work.

The working principle of the utility model is as follows (taking pressing the big flushing button assembly 32 as an example):

first, as shown in fig. 3, a space at the upper end of the piston portion 322 in the first cavity 310 is set as a chamber a, and a space at the lower end of the piston portion 322 is set as a chamber B; the space above the diaphragm 342 in the second cavity 311 is set as chamber C, and the space below the diaphragm 342 is set as chamber D; the third cavity 312 is provided as chamber E.

(1) When the button 320 is pressed, the space in the chamber a is enlarged, and the air in the chamber a is in a low-pressure state, so that the outside air enters the chamber a through the first air pipeline 323, and the consistency of the inside air pressure and the outside air pressure is realized; meanwhile, the space in the chamber B becomes small, and the air therein is in a compressed state, so that the air pressure is higher than the external atmospheric pressure, the high-pressure air in the chamber B opens the check valve assembly 37 at the end of the second air pipe to rapidly discharge the air to the outside, and finally the internal and external air pressures are consistent, and the pressure generated by the total pressure difference applied to the piston part 322 can be ignored as long as the opening pressure of the check valve assembly 37 is ensured to be small;

(2) the button 320 pushes the diaphragm assembly 34 and the slide valve assembly 35 to move downwards, and in the moving process, the chamber C and the chamber D are communicated by adopting through holes on the diaphragm 342, so that the consistency of vacuum values is realized, pressure values generated on the upper surface and the lower surface of the diaphragm assembly 34 are consistent, and the influence of the vacuum pressure on the total force value of the diaphragm assembly 34 is further counteracted; in the process of downward movement, the valve clack 352 enters the atmosphere pipeline interface 317 to realize blocking, a gap is formed between the sealing pressure plate 353 and the upper end face of the third cavity 312, and a gap arranged on the side wall of the valve rod 351 can realize communication between the chamber D and the chamber E, so that the vacuum pipeline interface 316 is communicated with the first air passage interface 318 and the second air passage interface 319;

(3) after the pneumatic control water valve 5 and the vacuum blowoff valve 6 are opened, water enters the pneumatic control water valve 5 from the water inlet pipeline 21 and finally enters the horse barrel body 1 to wash the horse barrel body 1, and waste liquid after cleaning passes through the vacuum blowoff valve 6 and is finally discharged along the vacuum sewer pipeline 22.

(4) Then the large flush button assembly 32 starts to reset, shortly after the hand leaves the button 320 of the large flush button assembly 32, the diaphragm assembly 34 and the slide valve assembly 35 all start to reset, at this time, the diaphragm assembly 34 starts to reset under the action of the second reset spring 344, the diaphragm assembly 34 resets and moves upwards, which causes the lower pressing plate 343 and the valve flap 352 to move upwards, and gradually reduces the distance between the upper end surface of the sealing pressing plate 353 and the upper end surface of the third cavity 312, but does not closely adhere to each other, so that the vacuum gas in the vacuum pipeline interface 316 can still enter the chamber E through the chamber D, meanwhile, the lower end portion of the valve flap 352 slides with the inner wall of the atmosphere pipeline interface 317 but does not separate, so that the close fit between the two still exists, and the communication between the vacuum pipeline interface 316 and the gas path interface of the vacuum waste 6 and the gas path interface of the gas control water valve 5 is continuously, the pneumatic control water valve 5 and the vacuum drain valve 6 which are connected with the pneumatic control water valve are still in an open state; after the valve is completely reset, the upper end face of the sealing pressing plate 353 is tightly attached to the upper end face of the fourth cavity, at this time, vacuum gas in the vacuum pipeline interface 316 cannot enter the chamber E through the chamber D, and meanwhile, the lower end of the valve clack 352 is completely separated from the inner wall of the atmosphere pipeline interface 317, so that the communication between the atmosphere pipeline interface 317 and the air path interface of the vacuum blowoff valve 6 and the air path interface of the air control water valve 5 is realized, the air control water valve 5 and the vacuum blowoff valve 6 connected with the atmosphere pipeline interface 317 are closed, and the whole process is finished.

Because the delay controller 3 has a delay function, the delay of flushing can be realized, and the specific working principle is as follows:

after the large/small flush button assembly 32/33 is pressed down and the hand leaves the button 320, the reset rebound is started by the action of the first reset spring 321, wherein the space in the chamber a becomes smaller, the air therein is in a compressed state, and thus the air pressure is higher than the external atmosphere, the high-pressure air in the chamber a rapidly exhausts the air to the external through the first air pipeline 323, and the air pressure in the chamber a is consistent with the external atmosphere; meanwhile, the gas in the chamber B generates negative pressure due to the increased volume, and the external atmosphere enters the chamber B through the tapered gap formed by the needle valve assembly 36 due to the pressure difference between the gas and the external atmosphere; the speed of the entering air is controlled by the adjustable needle valve assembly 36, so that the asynchronous reset of the large flushing button assembly 32 and the small flushing button assembly 33 can be realized, and the delayed reset function is realized.

The utility model discloses still have the interlocking and prevent slow-witted function, its concrete theory of operation is:

when the large flush button assembly 32 starts to reset and rebound to half of the total stroke under the throttling action of the first return spring 321 and the needle valve assembly 36, the time delay time in the small flush button assembly 33 is short, and the rebound speed is higher than that of the large flush button assembly 32 (the rebound speed is adjusted by controlling the size of the conical gap forming the throttling opening through the adjusting knob 362), so that after the lower end surface of the small flush button assembly 33 is completely separated from the upper end surface of the upper pressure plate 341, the flushing effect of the large flush button assembly 32 cannot be interfered.

The small flushing button assembly 33 also has a repentance function, namely, the small flushing button assembly 33 is pressed preferentially, the flushing mode needs to be changed when the pressing is wrong, only the large flushing button assembly 32 needs to be pressed directly, the timely switching is realized, and the flushing process does not need to be finished and then carried out, and the working principle is as follows: after the small flushing button assembly 33 is pressed down and then released, before the large flushing button assembly 32 is pressed down, the small flushing button assembly 33 starts to reset and rebound under the action of the first reset spring 321 after a hand leaves the button, and in the period before the hand leaves the small flushing button assembly 33 and presses the large flushing button assembly 32, the small flushing button assembly 33 has a certain rebound distance, and the rebound distance is offset after the large flushing button is pressed down, so that the large flushing mode is opened, and the purpose of timely switching is realized.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and therefore, the present invention is considered to be exemplary and not restrictive in any way, since the scope of the present invention is defined by the appended claims, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and therefore any reference signs in the claims are not intended to be construed as limiting the claims concerned.

Claims (5)

1. A vacuum sewer system, characterized by: the closestool comprises a closestool body, a flushing pipeline system arranged in the closestool body, a time delay controller for controlling the work of the flushing pipeline system, an air filter connected with the time delay controller, a pneumatic control water valve and a vacuum blowdown valve; the flushing pipeline system comprises a water inlet pipeline which penetrates through the pneumatic control water valve and extends into the closestool body, and a vacuum sewer pipeline which penetrates through the vacuum blowdown valve from the closestool body and extends outwards; the time delay controller is provided with an atmosphere pipeline interface connected with the air filter, a vacuum pipeline interface connected with the vacuum sewer pipeline through the one-way vacuum valve, a first air channel interface connected with the pneumatic control water valve and a second air channel interface connected with the vacuum blowdown valve.

2. A vacuum sewer system according to claim 1, further comprising: the time delay controller comprises a shell, a large flushing button assembly, a small flushing button assembly, a diaphragm assembly, a slide valve assembly, a pair of needle valve assemblies and a pair of one-way valve assemblies, wherein the large flushing button assembly and the small flushing button assembly are arranged in the shell, the diaphragm assembly and the slide valve assembly are respectively and independently controlled to realize piston movement through the large flushing button assembly and the small flushing button assembly, and the needle valve assemblies and the one-way valve assemblies are arranged in.

3. A vacuum sewer system according to claim 2, characterized in that: the shell comprises a pair of first cavity, a second cavity and a third cavity which are arranged from top to bottom in sequence; the upper ends of the first cavities are provided with hollow connecting shafts communicated with each other; a first inner hole communicated with the second cavity is formed between the second cavity and the first cavity, and a second inner hole communicated with the third cavity and the second cavity is formed between the third cavity and the second cavity; the vacuum pipeline interface is communicated with the second cavity, and the atmosphere pipeline interface, the first air path interface and the second air path interface are arranged below the shell and are communicated with the third cavity; the large flushing button assembly and the small flushing button assembly are identical in structure and are symmetrically installed, and each large flushing button assembly and each small flushing button assembly comprise a button and a first return spring, wherein the button penetrates through the hollow connecting shaft, the first cavity and the first inner hole in sequence and extends into the second cavity, and the first return spring is sleeved on the button and is positioned on the inner side and the outer side of the first cavity; the diaphragm assembly is arranged in the second cavity and comprises an upper pressure plate, a diaphragm, a lower pressure plate and a second return spring, wherein the upper pressure plate, the diaphragm and the lower pressure plate are sequentially arranged from top to bottom, and the second return spring is arranged below the lower pressure plate; the sliding valve assembly is fixedly connected with the lower pressing plate, penetrates through the second inner hole, extends into the third cavity, and comprises a valve rod, a valve clack fixedly connected with the lower end of the valve rod and a sealing pressing plate; the valve clack is arranged in the third cavity and is coaxial with the atmospheric pipeline interface; the needle valve assembly and the check valve assembly are arranged at the upper end of the shell and are respectively communicated with the first cavity, and the needle valve assembly comprises a needle valve core for controlling the flow rate of gas entering the first cavity; the check valve assembly comprises a steel ball, a compression spring and an inner adjusting screw, wherein the steel ball, the compression spring and the inner adjusting screw are used for enabling gas to flow out of the first cavity.

4. A vacuum sewer system according to claim 1, further comprising: the pneumatic control water valve is provided with a third air path interface, a water inlet and a water outlet, the third air path interface is connected with the first air path interface, and the water inlet pipeline is communicated with the water inlet and the water outlet.

5. A vacuum sewer system according to claim 1, further comprising: the vacuum blowoff valve is provided with a fourth gas path interface, a sewage inlet and a sewage outlet, the fourth gas path interface is connected with the second gas path interface, and the vacuum sewer pipeline is communicated with the sewage inlet and the sewage outlet.

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