Double-membrane negative pressure collector suitable for toilet stool and application of double-membrane negative pressure collector

Abstract

The invention relates to a double-membrane negative pressure collector suitable for a toilet stool and application of the double-membrane negative pressure collector. A collecting cavity, an inlet cavity provided with a collector inlet and an outlet cavity provided with a collector outlet are formed in a shell of the double-film negative pressure collector, a first valve sealing pair is arranged between the inlet cavity and the collecting cavity, a second valve sealing pair is arranged between the collecting cavity and the outlet cavity, and the collecting cavity is provided with an air distribution valve. The first valve sealing pair is a sealing pair which is completely sealed when closed and comprises a first sealing opening and a first sealing membrane, the second valve sealing pair is a sealing pair which is not completely sealed when closed and comprises a second sealing opening and a second sealing membrane, and the first sealing membrane and the second sealing membrane are both in a curved surface shape protruding towards the corresponding sealing openings. The collector is applied to sewage discharge of the toilet stool, an inlet of the collector is connected with a sewage discharge port of the toilet stool, and an outlet of the collector is connected with a negative pressure pipeline. Noise can be reduced while negative pressure consumption is reduced, and the increment of construction cost and other operation cost is reduced.

Description

Technical Field

[0001] This invention relates to a dual-membrane negative pressure collector suitable for toilets and its application. Background Technology

[0002] The negative pressure range of a toilet's negative pressure drainage (sewage) system is usually maintained between -0.4 bar and -0.6 bar. As one of the user-end devices, a negative pressure toilet is usually composed of a toilet body, a negative pressure valve, and a controller. The negative pressure valve is directly connected to the toilet's sewage outlet. When the negative pressure valve is open, a high-speed airflow passes through the toilet body's sewage outlet, resulting in a large consumption of negative pressure gas and generating a lot of noise, leading to a very poor user experience.

[0003] As an improvement, one current approach is to install an intermediate storage tank. This consists of a toilet body, a negative pressure valve, an intermediate storage tank, and a controller. The intermediate storage tank pre-stores a certain amount of negative pressure. When the toilet is used, it only consumes a fixed amount of negative pressure gas in the intermediate storage tank. By setting it up, the intermediate storage tank can be discharged once after multiple flushes, which reduces the consumption of negative pressure gas (or negative pressure consumption) to a certain extent and also helps to reduce noise. However, it requires the installation of an intermediate storage tank and storage room that can serve several toilets at the same time. It occupies a large space, has a complex configuration, is difficult to maintain, and has high costs, increasing construction costs and other operating costs besides negative pressure consumption. Summary of the Invention

[0004] The purpose of this invention is to reduce negative pressure consumption while simultaneously reducing noise, construction costs, and other operating costs.

[0005] The technical solution of the present invention is: a double-membrane negative pressure collector suitable for toilets (e.g., sit-down toilets), comprising a housing, a collection chamber, an inlet chamber (or inlet channel) with a collector inlet, and an outlet chamber (or outlet channel) with a collector outlet, wherein a first valve sealing pair is provided between the inlet chamber and the collection chamber, a second valve sealing pair is provided between the collection chamber and the outlet chamber, and an air distribution valve is provided in the collection chamber.

[0006] Preferably, both the first valve sealing pair and the second valve sealing pair are negative pressure valve sealing pairs (valve sealing pairs controlled by negative pressure).

[0007] Preferably, the outer end of the gas distribution valve is connected to the atmosphere.

[0008] Preferably, the air distribution valve is an air distribution valve equipped with a silencer.

[0009] Preferably, the first valve sealing pair is a sealing pair that is completely sealed (leaking is not allowed) when closed.

[0010] Preferably, the first valve sealing pair includes a first sealing port and a first sealing diaphragm that forms the valve sealing pair with the first sealing port. The sealing surface of the first sealing port is located on the inlet side (the side adjacent to / adjacent to the inlet). Further, the first sealing diaphragm is disposed in the inlet and separates a first negative pressure control chamber from the inlet that is not connected to the collector inlet. Thus, the first negative pressure control chamber and the first sealing port are located on opposite sides of the first sealing diaphragm.

[0011] Furthermore, the first negative pressure control chamber may be equipped with a first negative pressure control chamber negative pressure interface according to the prior art, for connecting a first control negative pressure source (e.g., a negative pressure pipe for controlling the first valve sealing pair).

[0012] Preferably, the first sealing diaphragm is an elastic diaphragm, for example, an integrally molded rubber diaphragm with corresponding elasticity.

[0013] Preferably, the first sealing diaphragm has a convex curved surface on the side adjacent to the first sealing port (the side near / adjacent to the first sealing port), that is, the surface facing the first sealing port is convex, and its periphery is sealed to the inner wall of the housing (for example, the periphery of the first sealing diaphragm is fixed and sealed in an embedding structure on the inner wall of the housing, such as an annular groove structure), together with the corresponding part of the housing, to form the first negative pressure control cavity. When there is no pressure difference between the two sides (no pressure difference between the two sides), the convex surface of the first sealing diaphragm (the surface on the side of the first sealing port) is in contact with the sealing surface of the first sealing port, and the first valve sealing pair is in a sealed state.

[0014] Preferably, the second valve sealing pair is a sealing pair that is not completely sealed when closed (allowing for a certain amount of leakage).

[0015] Preferably, the second valve sealing pair includes a second sealing port and a second sealing diaphragm that forms the valve sealing pair with the second sealing port. The sealing surface of the second sealing port is located on the outlet side (the side adjacent to / adjacent to the outlet). The second sealing diaphragm is disposed in the outlet and separates a second negative pressure control chamber from the outlet that is not connected to the collector outlet. The second negative pressure control chamber and the second sealing port are respectively located on both sides of the second sealing diaphragm, and a negative pressure interface for the second negative pressure control chamber is provided for connecting a second control negative pressure source (e.g., a negative pressure pipe for controlling the second valve sealing pair).

[0016] Preferably, the second sealing diaphragm is an elastic diaphragm, for example, an integrally molded rubber diaphragm with corresponding elasticity.

[0017] Preferably, the second sealing diaphragm has a convex curved surface on the side adjacent to / beside the second sealing port, that is, the surface facing the second sealing port is convex, and its periphery is sealed to the inner wall of the housing (for example, the periphery of the second sealing diaphragm is fixed and sealed in an embedding structure on the inner wall of the housing, such as an annular groove structure), together with the corresponding part of the housing, to enclose the second negative pressure control cavity. When not subjected to the pressure difference between the two sides, the convex surface of the second sealing diaphragm (the surface on the side of the second sealing port) is in contact with the sealing surface of the second sealing port, and the second valve sealing pair is in a partially sealed state (a closed state that allows a certain amount of leakage). Furthermore, the second sealing port is provided with a small notch and / or a small through hole connecting both sides of the sealing surface; alternatively, the isolation structure between the outlet cavity and the collection cavity is provided with a small through hole, so that when the second sealing port and the second sealing diaphragm are closed, a certain amount of medium is still allowed to flow from one side of the second valve sealing pair to the other side under the action of the pressure difference on both sides, thereby achieving incomplete sealing of the second valve sealing pair when closed. The size of the small notch / small through hole is determined according to actual needs, so as to ensure the collection effect while avoiding excessive consumption of negative pressure.

[0018] The application of any of the dual-membrane negative pressure collectors disclosed in this invention in the negative pressure sewage discharge of toilets is as follows: the collector inlet is connected to the sewage outlet of the toilet, and the collector outlet is connected to the negative pressure pipeline. Thus, the sewage of the toilet can be collected under negative pressure by the dual-membrane negative pressure collector and then sent into the negative pressure pipeline.

[0019] Preferably, under normal conditions, the first valve sealing pair and the second valve sealing pair are closed, and the air distribution valve is closed. In this state, the negative pressure of the negative pressure pipeline enters the collection chamber through the second valve sealing pair (since the second valve sealing pair is not completely sealed when closed) (for example, through a small notch provided on the second sealing port, and / or a small through hole provided on the second sealing port or on the isolation structure between the outlet and the collection chamber), making the negative pressure in the collection chamber the same (basically the same) as the negative pressure in the negative pressure pipeline. When the toilet needs to be flushed (for example, during or after flushing), the first valve sealing pair is opened (for example, the first negative pressure control valve is opened, connecting the negative pressure of the corresponding negative pressure pipe to the first negative pressure control chamber). After the sewage in the toilet is drawn into the collection chamber (in practice, this can be after a certain delay), the first valve sealing pair is closed, and then the second valve sealing pair is opened, and the air distribution valve is opened (allowing atmospheric air to enter the collection chamber). After the sewage in the collection chamber is drawn into the negative pressure pipeline, the second valve sealing pair is closed, and the air distribution valve is closed. After a certain delay, the negative pressure in the collection chamber returns to the same (basically the same) negative pressure as the negative pressure pipeline.

[0020] The beneficial effects of this invention are as follows: Since the sewage discharge process is achieved through the separate actions of the first and second valve sealing pairs, the negative pressure consumption for each discharge can be effectively reduced, thus saving energy. The collector is small in size and has a neat appearance. Furthermore, by being compatible with the existing negative pressure system of the negative pressure toilet, the control negative pressure can be drawn from the negative pressure pipeline of the toilet itself, simplifying the overall structure. Both the control valve and the air distribution valve can be electrically controlled, such as solenoid valves, and can be controlled using existing electrical control technology. The control method and device are simple and reliable. Except for the two sealing diaphragms, the collector can be used for a long time, and the service life of the sealing diaphragms is much longer than that of easily damaged parts in existing toilet flushing valves, making replacement convenient and cost-effective. The solenoid valve and control device can be placed in a relatively dry location that does not come into contact with water, which not only improves electrical safety but also helps maintain a longer service life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram (partially exploded) of the structure of the dual-membrane negative pressure collector of the present invention under normal conditions (both valve sealing pairs are closed). Figure 2 This is a schematic diagram of the structure of the dual-membrane negative pressure collector of the present invention in the state where the first valve sealing pair is open and the second valve sealing pair is closed; Figure 3 This is a schematic diagram of the structure of the dual-membrane negative pressure collector of the present invention in the state where the first valve sealing pair is closed and the second valve sealing pair is open; Figure 4 This is a schematic diagram of the structure of the dual-membrane negative pressure collector involved in the invention, applied to toilet waste discharge.

[0022] The diagram shows the following markings: 1. Toilet bowl; 2. Rubber connector; 3. Negative pressure pipeline; 4. Double-membrane negative pressure collector; 5. Flushing assembly; 6. Flushing button; 401. Collector inlet; 402. First sealing diaphragm; 403. First sealing port; 404. First negative pressure control chamber; 405. Collector outlet; 406. Second negative pressure control chamber; 407. Second sealing diaphragm; 408. Second sealing port; 409. Collection chamber; 410. Gas distribution valve; 411. Silencer; 412. Negative pressure interface of the first negative pressure control chamber; 413. Negative pressure interface of the second negative pressure control chamber. Detailed Implementation

[0023] See Figures 1 to 4This dual-membrane negative pressure collector 4 can use a plastic shell, an alloy shell, or any other suitable material. The main body of the shell can be roughly cylindrical (basic shape is cylindrical). The inlet pipe and outlet pipe are respectively located on the upper front side of the main body. The port of the inlet pipe can serve as the collector inlet 401. When used for collecting sewage from toilet 1, it is connected to the toilet's drain outlet through this port. The specific connection method can be based on existing technology, for example, through a rubber connector (rubber connecting pipe fitting) 2. The port of the outlet pipe can serve as the collector outlet 405. When used for collecting sewage from toilet 1, it is connected to the negative pressure pipeline 3 through this port. The specific connection method can be based on existing technology.

[0024] Any suitable toilet can be used, such as a negative pressure toilet. The toilet can adopt any suitable existing technology and can be equipped with a flush button 6 and a flushing assembly 5. A controller that can be set up according to existing technology can control various electrical control devices (e.g., solenoid valves used as negative pressure control valves, solenoid valves used as air distribution valves, etc.) to perform relevant start and stop actions according to the set timing sequence according to the working process of the collector. The flush button press signal (flushing signal) is connected to the controller as the start signal of the control process.

[0025] Typically, the outlet pipe can be located at the lower rear side of the main body, the upper part of the main body cavity and the inlet pipe cavity form the inlet cavity, the lower part of the main body cavity and the outlet pipe cavity form the outlet cavity, the middle part of the main body cavity is the collection cavity 409, and the top and bottom openings of the main body are respectively provided with a top cover and a bottom cover (sealed connection, for example, fastened by screws).

[0026] The first sealing diaphragm 402 is disposed within the inlet cavity, dividing the inlet cavity into two parts. One part connects the collector inlet and the first valve sealing pair, forming a channel from the collector inlet to the first sealing port. The other part is the first negative pressure control chamber, which is not connected to the collector inlet and the first valve sealing pair. The edge of the first sealing diaphragm can be clamped between the top cover and the top opening of the main body (the main body of the housing). An annular groove structure for embedding the edge of the first sealing diaphragm can be formed on the bottom edge of the top cover and the end face of the top opening of the main body. The edge of the first sealing diaphragm is clamped between the top cover and the top opening of the main body (in the corresponding groove structure), thus simultaneously fixing the first sealing diaphragm and sealing the top cover and the top opening of the main body. The first negative pressure control chamber 404 is the cavity (space) between the top cover and the first sealing diaphragm. This arrangement greatly facilitates the installation of the first sealing diaphragm and its subsequent maintenance and replacement.

[0027] The second sealing diaphragm 407 is disposed within the outlet cavity, dividing the outlet cavity into two parts. One part connects to the collector outlet and the second valve sealing pair, forming a channel from the second sealing port to the collector outlet. The other part is the second negative pressure control chamber, which is not connected to the collector outlet and the second valve sealing pair. The edge of the second sealing diaphragm can be clamped between the bottom cover and the bottom opening of the main body (the main body of the housing). An annular groove structure for embedding the edge of the second sealing diaphragm can be formed on the bottom edge of the bottom cover and the end face of the bottom opening of the main body. The edge of the second sealing diaphragm is clamped between the bottom cover and the bottom opening of the main body (in the corresponding groove structure), thus simultaneously fixing the second sealing diaphragm and sealing the bottom cover and the bottom opening of the main body. The second negative pressure control chamber is the cavity between the bottom cover and the second sealing diaphragm. This arrangement greatly facilitates the installation of the second sealing diaphragm and its subsequent maintenance and replacement.

[0028] Each interface can be flexibly configured according to existing technology and actual needs. For example, the air distribution valve (collector air distribution valve) 410 with a silencer 411 can be connected to the upper side wall of the collection chamber. The negative pressure interface (first negative pressure control chamber negative pressure interface 412) of the first negative pressure control chamber is set on the top cover, and the negative pressure interface (second negative pressure control chamber negative pressure interface 413) of the second negative pressure control chamber is set on the bottom cover. The negative pressure interface of each negative pressure control chamber can adopt any suitable pipe / fitting connection structure and be connected to its respective negative pressure pipe. A negative pressure pipe for controlling the negative pressure control chamber can be led out from a suitable location in the negative pressure system / negative pressure pipeline and connected to the negative pressure interface of each negative pressure control chamber. A corresponding negative pressure control valve is set on the negative pressure pipe connecting each negative pressure interface to control the on / off of the negative pressure. The negative pressure control valve can be a solenoid valve and can be set in any suitable location according to the site conditions (e.g., a location that does not come into contact with water and is conducive to ensuring electrical safety).

[0029] For example, a first negative pressure control valve (which can be a solenoid valve or any other suitable form) is connected in series at the negative pressure interface of the first negative pressure control chamber or on the negative pressure pipe connected to the negative pressure interface of the first negative pressure control chamber. After the first negative pressure control valve is opened, the negative pressure of the corresponding negative pressure pipe enters the first negative pressure control chamber (or, in other words, the negative pressure of the negative pressure pipe evacuates the first negative pressure control chamber), so that the first negative pressure control chamber is in a negative pressure state. When the pressure difference across the first sealing diaphragm reaches or exceeds a certain pressure difference value (which can be regarded as the opening threshold of the first valve sealing pair), the first sealing diaphragm bends and deforms toward the side of the first negative pressure control chamber (the side adjacent to / adjacent to the first negative pressure control chamber), and quickly disengages from the first sealing port (forming a corresponding gap between the first sealing diaphragm and the first sealing port), so that the first valve sealing pair is in an open state.

[0030] The second negative pressure control valve (which can be a solenoid valve or any other suitable form) can be connected in series at the negative pressure interface of the second negative pressure control chamber or on the negative pressure pipe connected to the negative pressure interface of the second negative pressure control chamber. After the second negative pressure control valve is opened, the negative pressure of the corresponding negative pressure pipe enters the second negative pressure control chamber (or, the negative pressure of the negative pressure pipe evacuates the second negative pressure control chamber), so that the second negative pressure control chamber is in a negative pressure state. When the pressure difference across the second sealing diaphragm reaches or exceeds a certain pressure difference value (which can be regarded as the opening threshold of the second valve sealing pair), the second sealing diaphragm bends and deforms toward the side of the second negative pressure control chamber (the side adjacent to / adjacent to the second negative pressure control chamber), and quickly disengages from the second sealing port (forming a corresponding gap between the second sealing diaphragm and the second sealing port), so that the second valve sealing pair is in the open state.

[0031] The first and second negative pressure control valves can be two-position three-way valves (for example, a dedicated negative pressure controller with two-position three-way function). The common port of the two-position three-way valve is connected to the negative pressure port of the corresponding negative pressure control chamber (the first negative pressure control chamber or the second negative pressure control chamber). (In this case, the connecting pipe between the negative pressure control valve and the corresponding negative pressure control chamber can be regarded as part of the negative pressure port of the negative pressure control chamber). One of the two single-way ports is connected to the corresponding negative pressure pipe, and the other is open to the atmosphere. By switching the state of the two-position three-way valve, the corresponding negative pressure control chamber is connected to the negative pressure pipe or to the atmosphere. (The aforementioned opening of the negative pressure control valve is to switch the negative pressure control valve to the state where the common port is connected to the single-way port connected to the negative pressure pipe; closing the negative pressure control valve is to switch the negative pressure control valve to the state where the common port is connected to the single-way port connected to the atmosphere.) When connected to the negative pressure pipe, the corresponding negative pressure control chamber enters a negative pressure state, and the corresponding valve sealing pair opens. When connected to the atmosphere, the corresponding negative pressure control chamber enters a zero pressure (atmospheric pressure) state, and the corresponding valve sealing pair closes.

[0032] Based on the same switching method as the aforementioned two-position three-way valve, the two-position three-way valve can be equivalently replaced by two valves (e.g., solenoid valves) that connect the negative pressure control chamber to the negative pressure pipe and the atmosphere respectively. Through the cooperation of the two valves, the pressure state (negative pressure or zero pressure) in the corresponding negative pressure control chamber can be switched.

[0033] The first sealing port 403 can be disposed on the isolation structure between the inlet cavity and the collection cavity, and has an annular protrusion located on the inlet cavity side (the side adjacent to / adjacent to the inlet cavity). The sealing surface of the first sealing port that mates with the first sealing diaphragm is disposed at the top of the annular protrusion. This annular protrusion structure design helps to prevent the sealing of the first valve sealing pair (first sealing diaphragm) from being hindered by adjacent structures.

[0034] The shape and related dimensions of the first sealing diaphragm can be reasonably set so that after deformation, the first sealing diaphragm can automatically return to its initial state (normal state) when the differential pressure on both sides is zero or less than a certain limit, based on its own elasticity or in conjunction with the reset action of the corresponding reset spring.

[0035] Due to the convex design and elasticity of the first sealing diaphragm, the first valve sealing pair can be stably kept closed when the pressure difference on both sides of the first sealing diaphragm does not reach a certain pressure difference value. When the pressure difference on both sides of the first sealing diaphragm reaches or exceeds a certain pressure difference value, it can deform quickly. Therefore, it not only has good closure stability, but also a fast response speed to negative pressure control.

[0036] The periphery of the first sealing diaphragm adopts a thickened bulging structure at the edge end (e.g., a T-shaped structure at the edge cross-section) so that it can be firmly fixed to the annular groove on the inner wall of the housing for embedding the periphery of the first sealing diaphragm (e.g., an annular groove formed by corresponding groove structures on the top cover and the top opening of the main body). The annular groove adopts a structure that is larger inside and smaller outside (e.g., a T-shaped structure at the cross-section of the annular groove). The edge of the first sealing diaphragm embedded in the corresponding annular groove fits tightly with the annular groove (e.g., the edge of the first sealing diaphragm embedded in the annular groove is compressed to a certain extent by the annular groove). Due to the large belly and small opening of the annular groove, effective fixation and sealing can be achieved.

[0037] The second sealing port 408 can be disposed on the isolation structure between the outlet cavity and the collection cavity, and has an annular protrusion located on the outlet cavity side (the side adjacent to / adjacent to the outlet cavity). The sealing surface of the second sealing port that mates with the second sealing diaphragm is disposed at the top of the annular protrusion. This annular protrusion structure design helps to prevent the sealing of the second valve sealing pair (second sealing diaphragm) from being hindered by adjacent structures.

[0038] The shape and related dimensions of the second sealing diaphragm can be reasonably set so that after deformation, the second sealing diaphragm can automatically return to its initial state (normal state) when the differential pressure on both sides is zero or less than a certain limit, based on its own elasticity or in conjunction with the reset action of the corresponding reset spring.

[0039] Due to the convex design and elasticity of the second sealing diaphragm, the second valve sealing pair can be stably kept closed when the pressure difference on both sides of the second sealing diaphragm does not reach a certain pressure difference value. When the pressure difference on both sides of the second sealing diaphragm reaches or exceeds a certain pressure difference value, it can deform quickly. Therefore, it not only has good closure stability, but also a fast response speed to negative pressure control.

[0040] The periphery of the second sealing diaphragm adopts a thickened bulging structure at the edge end (e.g., a T-shaped structure at the edge cross-section) so that it can be firmly fixed to the annular groove on the inner wall of the housing for embedding the periphery of the second sealing diaphragm (e.g., an annular groove formed by corresponding groove structures on the bottom cover and the bottom opening of the main body). The annular groove adopts a structure that is larger inside and smaller outside (e.g., a T-shaped structure at the cross-section of the annular groove). The edge of the second sealing diaphragm embedded in the corresponding annular groove fits tightly with the annular groove (e.g., the edge of the second sealing diaphragm embedded in the annular groove is compressed to a certain extent by the annular groove). Due to the large belly and small opening of the annular groove, effective fixation and sealing can be achieved.

[0041] Furthermore, a small notch and / or through hole can be provided on the second sealing port to connect the two sides of the sealing surface, so that when the second sealing port and the second sealing diaphragm are closed, a certain amount of medium can still flow from one side to the other under the action of the pressure difference on both sides. The size of the small notch / through hole is determined according to actual needs, so as to ensure the collection effect while avoiding excessive consumption of negative pressure.

[0042] Based on the same mechanism, a small through hole can be set on the isolation structure between the outlet cavity and the collection cavity or any other suitable position to connect the collection cavity and the outlet cavity. This way of setting the small through hole can also allow a certain amount of leakage (medium / negative pressure transmission) between the collection cavity and the outlet cavity when the second sealing diaphragm and the second sealing port are in contact with each other. It can be regarded as a specific implementation of the second valve sealing pair (not completely closed when closed).

[0043] Other necessary structures and supporting facilities can be set according to actual needs. For example, depending on actual needs, several feet can be set on the bottom surface of the bottom cover to realize the placement / installation and fixation of the dual-membrane negative pressure collector on the ground, while a certain distance is supported between the bottom cover and the ground (or other installation foundation) to facilitate the setting of the negative pressure interface of the second negative pressure control chamber and related pipelines.

[0044] This dual-membrane negative pressure collector can be used for the negative pressure collection of suitable sewage (or other liquids). For example, it can be applied to toilets for negative pressure discharge. The collector inlet is connected to the toilet's drain outlet, and the collector outlet is connected to a negative pressure pipeline. This allows the toilet's wastewater to be collected under negative pressure by the dual-membrane negative pressure collector and then sent into the negative pressure pipeline (see [link]). Figure 4Under normal conditions, the first and second valve sealing pairs are closed, and the gas distribution valve is closed. In this state, the negative pressure in the negative pressure pipeline enters the collection chamber through the second valve sealing pair (because the second valve sealing pair is not completely sealed when closed) (e.g., through a small notch provided on the second sealing port, and / or a small through hole provided on the second sealing port or on the isolation structure between the outlet and the collection chamber), making the negative pressure in the collection chamber the same (essentially the same) as the negative pressure in the negative pressure pipeline. When the toilet needs to be flushed (e.g., during or after flushing), the first control... The first valve sealing pair is opened (for example, the first negative pressure control valve is opened, and the negative pressure of the corresponding negative pressure pipe is connected to the first negative pressure control chamber). After the sewage in the toilet is sucked into the collection chamber (in practice, this can be after a certain delay), the first valve sealing pair is closed. Then the second valve sealing pair is opened, and the air distribution valve is opened to allow atmospheric air to enter the collection chamber. The sewage in the collection chamber is sucked into the negative pressure pipeline. Then the second valve sealing pair is closed, and the air distribution valve is closed. After a certain delay, the negative pressure in the collection chamber returns to the same (basically the same) as the negative pressure in the negative pressure pipeline.

[0045] The specific work process (control method) can be as follows: 1. Initial state and normal state (e.g.) Figure 1 (as shown) The collector interface 401 is connected to the drain outlet of toilet 1, and the collector outlet 405 is connected to the negative pressure drain pipe. Initially, the first negative pressure control chamber 404 and the second negative pressure control chamber 406 are at normal pressure. The first sealing diaphragm 402 and the first sealing port 403, and the second sealing diaphragm 407 and the second sealing port 408 are in a closed state. The first sealing port 403 is a fully sealed port, and the second sealing port 408 is not a fully sealed port. Therefore, negative pressure will enter the collection chamber 409 through the notch on the second sealing port 408, maintaining the collection chamber 409 and the negative pressure pipe at the same negative pressure. The gas distribution valve 410 is closed.

[0046] Step 1 of the collection process: After flushing, the controller connects the first negative pressure control chamber 404 to the negative pressure gas source, and the first sealing diaphragm 402 opens (the first valve sealing pair opens), allowing sewage in the toilet to be drawn into the collection chamber 409. Because the second sealing port 408 is not a fully sealed port (the second valve sealing pair is not completely sealed when closed), negative pressure in the pipeline continuously enters the collection chamber 409 through the gap to replenish the negative pressure consumed by sewage entering the collection chamber 409. The amount of negative pressure gas replenishment can be controlled by controlling the size of the gap, thereby controlling the amount of negative pressure gas consumed when the toilet is flushed.

[0047] The volume of the collection chamber 409 can be less than twice the total volume of toilet waste (total waste discharged in one go), which is less than 4 liters. Because of the use of this small-volume collection chamber, the amount of air replenished each time is small, which achieves less gas consumption and significantly reduces toilet discharge noise while ensuring sufficient suction power.

[0048] Step 2 of the collection process: After all the sewage in the toilet bowl has entered the collection chamber 409, the controller shuts off the first negative pressure control chamber 404 from the negative pressure air source and connects the second negative pressure control chamber 406 to the negative pressure air source. The first sealing diaphragm 402 closes, and the second sealing diaphragm 407 opens (the second valve sealing pair opens). Simultaneously, the controller opens the air distribution valve 410, allowing atmospheric air to enter the collection chamber 409, and the sewage in the collection chamber 409 is drawn into the negative pressure pipeline. When the air distribution valve 410 is open, the intake noise is reduced due to the silencer 411. The amount of negative pressure gas consumed when the second sealing diaphragm 407 is open can be effectively controlled and noise reduced by changing the diameter of the air distribution valve 410 and controlling the opening time of the air distribution valve 410.

[0049] 4. Delay, return to normal: After collection is complete, the second sealing diaphragm 407 closes, the gas distribution valve 410 closes, and the negative pressure gas source enters the collection chamber 409 through the notch of the second sealing port 408, maintaining the same negative pressure as the negative pressure pipeline, restoring the initial state, and preparing for the next flush.

[0050] Unless otherwise specified, the preferred and optional technical means disclosed in this invention can be arbitrarily combined to form several different specific embodiments when one preferred or optional technical means is a further limitation of another technical means.

Claims

1. A double-membrane negative pressure collector suitable for toilets, comprising a housing, characterized in that... The housing is provided with a collection chamber, an inlet chamber with a collector inlet, and an outlet chamber with a collector outlet. A first valve sealing pair is provided between the inlet chamber and the collection chamber, and a second valve sealing pair is provided between the collection chamber and the outlet chamber. The collection chamber is provided with a gas distribution valve.

2. The dual-membrane negative pressure collector as described in claim 1, characterized in that... The first valve sealing pair is a sealing pair that is completely sealed when closed.

3. The dual-membrane negative pressure collector as described in claim 2, characterized in that... The first valve sealing pair includes a first sealing port and a first sealing diaphragm that forms the valve sealing pair with the first sealing port. The sealing surface of the first sealing port is located on the inlet side. The first sealing diaphragm is disposed in the inlet and separates a first negative pressure control chamber from the inlet that is not connected to the collector inlet.

4. The dual-membrane negative pressure collector as described in claim 3, characterized in that... The first sealing diaphragm is an elastic diaphragm with a curved surface that protrudes from the first sealing port side.

5. The dual-membrane negative pressure collector as described in claim 1, characterized in that... The second valve sealing pair is a sealing pair that is not completely sealed when closed.

6. The dual-membrane negative pressure collector as described in claim 5, characterized in that... The second valve sealing pair includes a second sealing port and a second sealing diaphragm that forms the valve sealing pair with the second sealing port. The sealing surface of the second sealing port is located on the outlet side. The second sealing diaphragm is disposed in the outlet and separates a second negative pressure control chamber from the outlet that is not connected to the collector outlet.

7. The dual-membrane negative pressure collector as described in claim 6, characterized in that... The second sealing diaphragm is an elastic diaphragm with a curved surface that protrudes from the side of the second sealing opening.

8. The dual-membrane negative pressure collector as described in any one of claims 5-7, characterized in that... The second sealing port is provided with a small notch and / or a small through hole connecting the two sides of the sealing surface, or the isolation structure between the outlet cavity and the collection cavity is provided with a small through hole.

9. The application of the dual-membrane negative pressure collector for toilets according to any one of claims 1-8 in negative pressure sewage discharge of toilets, wherein the collector inlet is connected to the sewage outlet of the toilet and the collector outlet is connected to the negative pressure pipeline.

10. The application as described in claim 9, characterized in that... Under normal conditions, the first and second valve sealing pairs are closed, and the air distribution valve is closed. When the toilet needs to be emptied, the first valve sealing pair is opened, and the sewage in the toilet is sucked into the collection chamber. Then the first valve sealing pair is closed, the second valve sealing pair is opened, and the air distribution valve is opened. The sewage in the collection chamber is sucked into the negative pressure pipeline, and then the second valve sealing pair is closed, and the air distribution valve is closed.

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