CN213952414U

CN213952414U - Water-saving toilet

Info

Publication number: CN213952414U
Application number: CN202022516653.9U
Authority: CN
Inventors: 廖冬冬
Original assignee: Xiamen Chenxinghuitong Technology Co ltd
Current assignee: Xiamen wisdom Chenxing Technology Co.,Ltd.
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-08-13
Anticipated expiration: 2030-11-04

Abstract

The utility model discloses a water-saving toilet stool, include: the body is provided with a basin part, and the bottom of the basin part is provided with an upper trap and a sewage discharge port and a lower flushing water inlet which are communicated with the upper trap and are both positioned below the water surface of the upper trap; the inlet end of the sewage discharge bent pipe is communicated with the sewage discharge port, and a cavity isolated from the outside air is formed in the sewage discharge bent pipe when the sewage discharge bent pipe is not flushed; and the negative pressure device is communicated with the cavity and is used for sucking air in the cavity to the lower flushing water inlet when flushing is started. Adopt the technical scheme of the utility model the flushing performance of stool pot can be improved greatly for the stool pot is economized on water more, and can effectively avoid the contaminated problem of room air.

Description

Water-saving toilet

Technical Field

The utility model relates to the technical field of sanitary wares, especially, relate to a water conservation stool pot.

Background

At present lean on closestool of supplementary siphon of negative pressure, like the "siphon auxiliary device of squatting pan" that chinese utility model patent CN201991060U discloses, its siphon bend that is used for the blowdown generally has two water traps, have the cavity between the upper and lower two water traps, this cavity passes through the air duct and communicates with the top of the container of the negative pressure generating device that sets up in the closestool water tank, during the drainage, negative pressure generating device makes the interior negative pressure increase of cavity through the air of the cavity between the two water seals of this air duct suction two water traps, thereby can in time promote the siphon to produce and then discharge the excrement in the closestool fast. The siphon auxiliary device still needs to be further improved in promoting the siphon effect and improving the water saving performance. In addition, the air sucked out from the cavity between the two water seals of the double trap by the siphon auxiliary device is usually directly discharged into the outside air, and the sucked out air is usually peculiar smell, which causes pollution to the indoor air.

SUMMERY OF THE UTILITY MODEL

The utility model provides a solve the above-mentioned problem, provide a water-saving toilet stool, its flushing performance is better, economizes on water more to can effectively avoid the contaminated problem of room air.

In order to achieve the purpose, the utility model provides the following technical scheme:

a water saving toilet stool comprising:

the body is provided with a basin part, and the bottom of the basin part is provided with an upper trap and a sewage discharge port and a lower flushing water inlet which are communicated with the upper trap and are both positioned below the water surface of the upper trap;

the inlet end of the sewage discharge bent pipe is communicated with the sewage discharge port, and a cavity isolated from the outside air is formed in the sewage discharge bent pipe when the sewage discharge bent pipe is not flushed;

and the negative pressure device is communicated with the cavity and is used for sucking air in the cavity to the lower flushing water inlet when flushing is started.

According to the utility model discloses a water-saving toilet stool, through setting up negative pressure device, during the washing, utilize the air suction in the cavity isolated with the ambient air that negative pressure device will form in the blowdown return bend to down the washing water inlet, utilize the pressure of air to increase down the washing water inlet and spout the fluid impulsive force in the basin to improved the flushing performance greatly, makeed the stool pot to economize on water more. And because the air sucked out of the cavity is sprayed into the basin part from the lower flushing water inlet and returns to the sewage bent pipe, the indoor air pollution caused by odor is effectively avoided.

As a further preferable scheme, the waste trap is further formed with a lower trap arranged at an interval with the upper trap, and a cavity between the upper trap and the lower trap forms the cavity; or a blowoff valve used for controlling the on-off of the blowoff elbow is arranged in the blowoff elbow, the blowoff valve and the upper trap are arranged at intervals, and a cavity between the blowoff valve and the upper trap forms the cavity.

In the scheme, the cavity between the upper trap and the lower trap forms the cavity by arranging the lower trap, so that the structure is simple; or, through setting up the blowoff valve for the cavity between blowoff valve and the last trap forms the cavity, the blowoff valve can make the controllability of washing control better, and control is more accurate, and the function is more reliable.

As a further preferable scheme, the negative pressure device adopts a vacuum pump, the water-saving toilet further comprises a control panel for controlling the vacuum pump to open and close, and the control panel controls the vacuum pump to open for a preset time and then close when the water-saving toilet starts to flush.

Among the above-mentioned scheme, negative pressure device adopts the vacuum pump, through the switching of control panel control vacuum pump, and the structure is simpler, and control is more accurate, and the function of bleeding is more reliable.

As a further preferable scheme, the control panel also controls the opening and closing of the blowoff valve, and the control panel is connected with the negative pressure device and the blowoff valve and controls the negative pressure device to open and then delay preset time to open the blowoff valve.

In the above scheme, the opening time of the blowoff valve is set to be later than that of the negative pressure device, so that the negative pressure device can suck air in the cavity more quickly, negative pressure is formed in the cavity as soon as possible, siphon is formed as soon as possible, and the effect is better.

As a further preferable scheme, the negative pressure device further comprises an air storage tank, wherein the outlet end of the negative pressure device is communicated with the inlet end of the air storage tank, and the outlet end of the air storage tank is communicated with the lower water flushing inlet.

Among the above-mentioned scheme, through setting up the gas holder, negative pressure equipment can be with the air suction in the cavity to the gas holder in keeping in for atmospheric pressure increase in the gas holder, after the air outlet passage of gas holder ventilates (also the gas holder is to the pipeline intercommunication between the water inlet of undershoot), the fluid scouring force of water inlet under the atmospheric pressure of increase can effectively improve.

As a further preferred scheme, the device further comprises a water-gas mixing tank, wherein the water-gas mixing tank is provided with a gas inlet and a water inlet, the gas inlet of the water-gas mixing tank is communicated with the outlet end of the gas storage tank, the water inlet of the water-gas mixing tank is communicated with an external water source, and the outlet of the water-gas mixing tank is communicated with the lower water flushing inlet.

Among the above-mentioned scheme, through setting up the aqueous vapor blending tank, the aqueous vapor blending tank can be with from the air of cavity suction with supply to down the rivers of washing water inlet spout from washing water inlet again together after mixing to make down washing water inlet spun rivers pressure improve, rivers are more stable, and the washing effect is better.

As a further preferable scheme, the water mixing device further comprises a water inlet tank, and the external water source is communicated with the water-gas mixing tank through the water inlet tank to supply water to the water-gas mixing tank.

In the above-mentioned scheme, through setting up into the water pitcher, the effect of buffering can be played to the rivers of intaking to the jar of intaking for the rivers that get into the aqueous vapor blending tank are more steady, and then make the mixed effect of aqueous vapor blending tank normal water and air better.

More preferably, an upper flushing water inlet is formed at the upper part of the basin part, and water flow flowing out from the upper flushing water inlet washes the wall surface of the basin part; a lower water flushing electromagnetic valve is arranged on a water path between the water-gas mixing tank and the lower water flushing water inlet, an upper water flushing electromagnetic valve is arranged on a water path for supplying water to the upper water flushing water inlet, and a control panel controls the lower water flushing electromagnetic valve and the upper water flushing electromagnetic valve to be opened and closed; and the control panel controls the upper water flushing electromagnetic valve to be closed and then opens the lower water flushing electromagnetic valve.

Among the above-mentioned scheme, through setting up down the water supply of water inlet whether to down water punching solenoid valve control to and through setting up the water supply of water punching solenoid valve control to the water inlet of punching water whether, control is simpler reliable. And, set up the opening opportunity of undershoot water solenoid valve as being later than the opening opportunity of undershoot water solenoid valve, like this, can be so that the filth on the wall with basin portion of the water inlet of washing by water washes the bottom of falling to basin portion after, undershoot water inlet is sprayed water again and is taken away the filth in the basin portion more thoroughly, and the washing effect is better.

As a further preferred scheme, the body is a toilet body, and the control panel, the negative pressure device, the air storage tank, the water-air mixing tank, the lower water flushing electromagnetic valve and the upper water flushing electromagnetic valve are arranged on the toilet body;

or the body is a toilet body, the water-saving toilet further comprises a control cabinet, the control panel, the negative pressure device, the air storage tank, the water-air mixing tank, the lower flushing electromagnetic valve and the upper flushing electromagnetic valve are arranged in the control cabinet, and the control cabinet is arranged in the toilet body or outside the toilet body;

or, the body is the body of squatting, water-saving toilet still includes a switch board, the control panel negative pressure device, gas holder, aqueous vapor hybrid tank, down water solenoid valve and the water solenoid valve of punching the water locate in the switch board.

In the above scheme, through setting up the switch board, will control part integration settings such as control panel, negative pressure device, gas holder, aqueous vapor hybrid tank, down water solenoid valve and the water solenoid valve of punching upward are in the switch board, during the installation, can install each part to the switch board after, again with whole switch board module installation in assigned position to greatly made things convenient for installation and maintenance.

As a further preferable scheme, the lower flushing water inlet and the sewage discharge outlet are arranged oppositely, and the air in the cavity and the water supplied to the lower flushing water inlet are sprayed out from the lower flushing water inlet together; the waste trap forms a siphon during flushing.

In the above scheme, through with down the washing water inlet with the drain sets up relatively, can make down washing water inlet spun fluid directly spray to the drain to can effectively promote the discharge of sewage, and promote the blowdown return bend and form the siphon.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

fig. 1 is a schematic view of a water saving toilet according to an embodiment of the present invention.

The reference signs are:

10-a body; 11-a tub part; 111-wall face; 12-a flushing water inlet; 121-lower water flushing inlet; 122-upper flushing water inlet; 13-upper trap; 14-a sewage draining outlet; 15-a spray head; 20-blowdown elbow pipe; 21-a communication port; 22-a cavity; 30-a blowdown valve; 40-negative pressure device (vacuum pump P); 50-control panel (C); 60-gas storage tank (T1); 70-water gas mixing tank (T2); 80-water intake tank (T3); 91-lower water solenoid valve; 92-upper water solenoid valve; 100-control cabinet.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention clearer and more obvious, the following description of the present invention with reference to the accompanying drawings and embodiments is provided for further details. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1, the water saving toilet according to an embodiment of the present invention includes: a body 10, a waste trap 20, a waste valve 30, a negative pressure device 40, and a control plate 50 (indicated by C). The toilet of the present invention can be a toilet or a squatting pan, and the embodiment will be described in detail by taking the toilet (i.e. the main body 10 is a toilet body) as an example.

Wherein, the body 10 has a tub 11, the bottom of the tub 11 is formed with an upper trap 13 and is provided with a drain outlet 14 and a lower flush water inlet 121 which are communicated with the upper trap 13 and are both positioned below the water surface of the upper trap 13, and the upper trap 13 can isolate the drain outlet 14 and the lower flush water inlet 121 from the outside air. The inlet end of the waste trap 20 is connected to the waste outlet 14 and, when not flushed, a chamber 22 isolated from the ambient air is formed in the waste trap 20. The negative pressure device 40 is communicated with the cavity 22 and is used for sucking air in the cavity 22 to the lower water inlet 121 when flushing is started. By arranging the negative pressure device 40, during flushing, air in the cavity 22 isolated from the outside air formed in the sewage bent pipe 20 is sucked to the lower flushing water inlet 121 by the negative pressure device 40, and the fluid impact force of the lower flushing water inlet 121 sprayed into the basin 11 is increased by the pressure of the air, so that the flushing performance is greatly improved, and the toilet is more water-saving. And, because the air sucked in the cavity 22 is sprayed into the tub 11 from the lower flushing water inlet 121 and returned to the waste trap 20, the indoor air pollution caused by the odor is effectively prevented.

In this embodiment, a blowoff valve 30 for controlling the on/off of the blowoff trap 20 is disposed in the blowoff trap 20, the blowoff valve 30 is disposed at an interval from the upper trap 13, and the cavity between the blowoff valve 30 and the upper trap 13 forms the cavity 22. When not being flushed, the waste valve 30 is closed and the waste outlet 14 is closed off from the outside air by the upper trap 13, and therefore the chamber 22 is isolated from the outside air. By providing the blowoff valve 30 to form the chamber 22 isolated from the outside air, the controllability of the flushing control is better, the control is more precise, and the function is more reliable.

In this embodiment, the negative pressure device 40 is a vacuum pump (indicated by P in the figure), the control board 50 is used to control the on/off of the vacuum pump, and the control board 50 controls the vacuum pump to be turned on for a preset time and then turned off when the flushing is started. The negative pressure device 40 may also be a negative pressure generating device similar to that in the background art, or a device that generates negative pressure by using the venturi effect, and the negative pressure device 40 is not limited to the vacuum pump of the present embodiment.

The negative pressure device 40 is communicated with the cavity 22 and used for sucking air in the cavity 22 to the lower flushing water inlet 121, specifically, a communicating opening 21 which penetrates through the cavity wall is formed in the cavity wall of the cavity 22, and the inlet end of the negative pressure device 40 is communicated with the communicating opening 21 through a pipeline. The control panel 50 also controls the opening and closing of the soil exhaust valve 30, and the soil exhaust valve 30 may be of a type that can be opened and closed in the related art.

The waste trap 20 of this embodiment is integrally formed with the body 10 to form a siphon when flushed.

In the water-saving toilet of the present embodiment, the flush water inlet 12 for flushing the bowl portion 11 includes the lower flush water inlet 121 and the upper flush water inlet 122 provided at the upper portion of the bowl portion 11. Wherein, the lower water inlet 121 is provided with a spray nozzle 15, the lower water inlet 121 is arranged opposite to the sewage discharge outlet 14, and the air in the cavity 22 and the water supplied to the lower water inlet 121 are sprayed out from the lower water inlet 121 and are sprayed towards the sewage discharge outlet 14; the wall surface 111 of the bowl 11 is washed by the water jetted from the upper flush water inlet 122, but in the present embodiment, the upper flush water inlet 122 is directly supplied with tap water, and the source of the water supplied to the upper flush water inlet 122 may be water from a tank. The air sucked by the negative pressure device 40 and the water supplied to the lower flushing water inlet 121 are sprayed out from the lower flushing water inlet 121, on one hand, the water flow pressure sprayed out from the lower flushing water inlet 121 can be improved, and the siphon of the sewage discharge elbow 20 is promoted to be generated as soon as possible, so that the siphon sewage discharge capacity of the toilet is greatly improved, and the flushing water quantity is saved; on the other hand, since the air sucked from the chamber 22 is returned to the waste trap 20, the indoor air is effectively prevented from being polluted by the odor.

In the water-saving toilet of the present embodiment, the control board 50 may be connected to the negative pressure device 40 and the waste water valve 30 by wire or wireless, and controls the negative pressure device 40 to open and then the waste water valve 30 to open after a preset time delay. The opening time of the blowoff valve 30 is set to be later than that of the negative pressure device 40, so that the negative pressure device 40 can suck the air in the cavity 22 more quickly, and the negative pressure is formed in the cavity 22 as soon as possible, so as to promote the siphon to be formed as soon as possible, and the effect is better.

The water saving toilet of the present embodiment further includes an air tank 60 (indicated by T1 in the figure), an outlet end of the negative pressure device 40 is communicated with an inlet end of the air tank 60, and an outlet end of the air tank 60 is communicated with the lower flushing water inlet 121. Through setting up gas holder 60, negative pressure equipment 40 can be with the air suction in the cavity 22 to store in the gas holder 60 temporarily for atmospheric pressure in the gas holder 60 increases, and after the air outlet passage of gas holder 60 ventilated (also after the pipeline intercommunication between gas holder 60 and the lower wash water inlet 121), the fluid scouring force of wash water inlet 121 under can effectively improving to the atmospheric pressure of increase.

The water saving toilet of this embodiment further includes a water-air mixing tank 70 (indicated by T2 in the figure), the water-air mixing tank 70 has an air inlet and a water inlet, the air inlet of the water-air mixing tank 70 is communicated with the outlet end of the air storage tank 60, the water inlet of the water-air mixing tank 70 is communicated with an external water source, the outlet of the water-air mixing tank 70 is communicated to the lower flushing water inlet 121, and the external water source may be tap water or water delivered by an external water pump, etc. Through setting up aqueous vapor blending tank 70, aqueous vapor blending tank 70 can be with from the air of cavity 22 suction with supply to down wash water inlet 121's rivers after mixing from washing by water inlet 12 blowout together again to make down wash by water inlet 121 spun rivers pressure improve, rivers are more stable, and the washing effect is better.

In order to better control the flushing to improve the flushing effect, the water-saving toilet of the present embodiment is provided with the lower flushing solenoid valve 91 on the water path between the outlet of the water-air mixing tank 70 and the lower flushing water inlet 121, the upper flushing solenoid valve 92 on the tap water path for supplying water to the upper flushing water inlet 122, and the control board 50 controls the opening and closing of the lower flushing solenoid valve 91 and the upper flushing solenoid valve 92. Preferably, control panel 50 control is gone up water solenoid valve 92 and is opened down water solenoid valve 91 after closing, promptly, sets up the opening opportunity of water solenoid valve 91 down to be later than the opening opportunity of water solenoid valve 92, like this, can make and go up water inlet 122 and wash the filth on the wall 111 of basin portion 11 and fall to the bottom of basin portion 11 after, down water inlet 121 water spray can take away the filth in the basin portion 11 more thoroughly, and the washing effect is better.

The water saving toilet of the present embodiment further includes a water inlet tank 80 (indicated by T3 in the figure), and an external water source is communicated with the water-air mixing tank 70 via the water inlet tank 80 to supply water to the water-air mixing tank 70. Through setting up into water pitcher 80, the effect of buffering can be played to the rivers of intaking to the jar 80 of intaking for the rivers that get into vapor mixing tank 70 are more steady, and then make the mixed effect of vapor mixing tank 70 normal water and air better.

In order to make the water saving toilet have better integrity and convenient installation and maintenance, the water saving toilet of the embodiment further comprises a control cabinet 100, the control panel 50, the negative pressure device 40, the air storage tank 60, the water-air mixing tank 70, the lower flushing electromagnetic valve 91 and the upper flushing electromagnetic valve 92 are arranged in the control cabinet 100, and the control cabinet 100 can be selectively arranged in the toilet body or outside the toilet body. Through setting up switch board 100, with control panel 50, negative pressure device 40, gas holder 60, aqueous vapor hybrid tank 70, down water solenoid valve 91 and the integrated setting of control components such as upper water solenoid valve 92 in switch board 100, during the installation, can install each part to switch board 100 back, install whole switch board module again in the assigned position to greatly made things convenient for installation and maintenance.

Of course, in other embodiments, the control panel 50, the negative pressure device 40, the air storage tank 60, the water-air mixing tank 70, the lower water-flushing electromagnetic valve 91 and the upper water-flushing electromagnetic valve 92 can be directly arranged on the toilet body, preferably in a cavity arranged at the rear part of the toilet body.

Similarly, when the toilet is a squatting pan, that is, when the main body 10 is a squatting pan, the water saving toilet may also include a control cabinet 100, and the control panel 50, the negative pressure device 40, the air storage tank 60, the water-air mixing tank 70, the lower flushing electromagnetic valve 91 and the upper flushing electromagnetic valve 92 are disposed in the control cabinet 100, so as to facilitate installation and maintenance.

The specific working process of this embodiment is as follows:

firstly, after the control panel 50 receives a flushing command, the upper flushing electromagnetic valve 92 is controlled to be opened, and tap water flows out from the upper flushing water inlet 122 to flush the wall surface 111 of the basin part 11; at the same time or after a little delay, the control board 50 controls the negative pressure device 40 to be opened, so as to pump air into the cavity 22, so that the cavity 22 generates negative pressure quickly, and the air pumped by the negative pressure device 40 passes through the air storage tank 60 and then is led to the water-air mixing tank to be mixed with the tap water entering the water-air mixing tank 70; after the negative pressure device 40 sucks for a few seconds, the control panel 50 controls the negative pressure device 40 to close and open the blowoff valve 30, so that the blowoff elbow 20 is communicated to smoothly blow off, meanwhile, the control panel 50 controls the lower water electromagnetic valve 91 to be opened, mixed fluid in the water-air mixing tank is sprayed out from the lower water inlet 121 to be sprayed towards the blowoff port 14, the discharge of sewage is promoted, and the siphon is produced by the blowoff elbow 20, so that the siphon blow-off process is completed. After the washing, the control panel 50 controls the blowoff valve 30, the lower water solenoid valve 91 and the upper water solenoid valve 92 to be closed, the lower water solenoid valve 91 can be closed before closing the blowoff valve 30, and the upper water solenoid valve 92 can be closed after closing the blowoff valve 30, so that the upper water inlet 122 continues to supply water to the basin 11 after the blowoff valve 30 is closed, thereby filling the water stored in the upper trap 13, and sealing the sewage outlet 14 and the lower water inlet 121 again.

In an embodiment not shown, the chamber 22 can also be formed using two traps, in particular: the waste trap 20 is further formed with a lower trap (not shown) spaced from the upper trap 13, the cavity between the upper trap 13 and the lower trap forming the chamber 22, which forms the chamber 22 isolated from the ambient air. The scheme of forming the cavity 22 by two traps is simpler in structure and lower in cost.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. A water-saving toilet stool, characterized by comprising:

2. The water-saving toilet stool according to claim 1, wherein the waste trap is further formed with a lower trap spaced apart from the upper trap, and a cavity between the upper trap and the lower trap forms the cavity; or a blowoff valve used for controlling the on-off of the blowoff elbow is arranged in the blowoff elbow, the blowoff valve and the upper trap are arranged at intervals, and a cavity between the blowoff valve and the upper trap forms the cavity.

3. The water-saving toilet stool according to claim 2, characterized in that the negative pressure device adopts a vacuum pump, the water-saving toilet stool further comprises a control panel for controlling the vacuum pump to open and close, and the control panel controls the vacuum pump to open for a preset time and then close when the toilet stool starts to flush.

4. The water-saving toilet stool according to claim 3, characterized in that the control panel also controls the opening and closing of the blowoff valve, and the control panel is connected with the negative pressure device and the blowoff valve and controls the negative pressure device to open and then delay a preset time to open the blowoff valve.

5. The water-saving toilet bowl according to claim 1, characterized by further comprising an air storage tank, wherein the outlet end of the negative pressure device is communicated with the inlet end of the air storage tank, and the outlet end of the air storage tank is communicated with the lower water flushing inlet.

6. The water-saving toilet stool according to claim 5, characterized by further comprising a water-gas mixing tank, wherein the water-gas mixing tank is provided with a gas inlet and a water inlet, the gas inlet of the water-gas mixing tank is communicated with the outlet end of the gas storage tank, the water inlet of the water-gas mixing tank is communicated with an external water source, and the outlet of the water-gas mixing tank is communicated with the lower flushing water inlet.

7. The water-saving toilet stool according to claim 6, further comprising a water inlet tank, wherein the external water source is communicated with the water-air mixing tank through the water inlet tank to supply water to the water-air mixing tank.

8. The water-saving toilet bowl according to claim 6, wherein an upper flushing water inlet is formed at the upper part of the bowl part, and the water flow flowing out from the upper flushing water inlet washes the wall surface of the bowl part; a lower water flushing electromagnetic valve is arranged on a water path between the water-gas mixing tank and the lower water flushing water inlet, an upper water flushing electromagnetic valve is arranged on a water path for supplying water to the upper water flushing water inlet, and a control panel controls the lower water flushing electromagnetic valve and the upper water flushing electromagnetic valve to be opened and closed; and the control panel controls the upper water flushing electromagnetic valve to be closed and then opens the lower water flushing electromagnetic valve.

9. The water-saving toilet stool according to claim 8, wherein the body is a toilet stool body, and the control panel, the negative pressure device, the air storage tank, the water-air mixing tank, the lower flushing solenoid valve and the upper flushing solenoid valve are arranged on the toilet stool body;

10. The water-saving toilet stool according to claim 1, wherein the lower flushing water inlet is arranged opposite to the sewage discharge outlet, and air in the cavity is ejected from the lower flushing water inlet together with water supplied to the lower flushing water inlet; the waste trap forms a siphon during flushing.