CN115853087A - Foam generating device and closestool - Google Patents

Abstract

The embodiment of the application relates to the technical field of toilets, in particular to a foam generating device and a toilet. The foam generating device comprises a first liquid supply assembly, a liquid mixing container, a second liquid supply assembly and a spray head assembly. The first liquid supply assembly comprises a first liquid storage container and a piston pump, the first liquid storage container is connected with the piston pump, foam liquid is supplied to the piston pump, the piston pump comprises a pump body and a piston rod, the piston rod and the pump body jointly enclose a piston cavity, the piston cavity is used for sucking or discharging the foam liquid, and the piston cavity and the piston rod are arranged in a separated mode. The liquid mixing container is connected to a piston pump, and the piston pump supplies the foam concentrate to the liquid mixing container. The second liquid supply assembly is connected with the liquid mixing container and is used for supplying water. The mixed foam liquid flows into the spray head assembly from the liquid mixing container and is sprayed out after being mixed with air. With the above configuration, the piston pump sucks or discharges the foam liquid, and the foam liquid is mixed with water in the liquid mixing container, and finally mixed with air at the head and ejected.

Description

Foam generating device and closestool

Technical Field

The embodiment of the application relates to the technical field of toilets, in particular to a foam generating device and a toilet.

Background

In order to deal with the emphasis on the concept of hygiene and the increase in the demand for hygiene of people, the original old-style toilet is being gradually replaced by the intelligent toilet. The intelligent closestool mainly has the functions of washing buttocks, massaging, automatically flushing, foaming shield and the like. The intelligent closestool has the advantages that on one hand, the foam shield has the functions of lubricating the inner wall of the closestool, reducing the adhesion of stains to the ceramic inner wall of the closestool and facilitating more efficient flushing during flushing, so that the inner wall of the closestool is cleaned, and the residues of bacteria and microorganisms are reduced; meanwhile, the functions of odor isolation and water splashing prevention are achieved. The foam shield function can be realized by using a set of foam generating device to generate foam.

In the process of implementing the embodiment of the application, the inventor finds that: the current intelligent closestool comprises: water source, foam liquid source, distributing valve, liquid mixing box, one-way membrane pump and shower nozzle. The water source is connected with the distribution valve, the distribution valve is connected with the liquid mixing box, the distribution valve supplies water into the liquid mixing box, the foam liquid source is connected with the liquid mixing box, the water and the foam liquid are mixed in the liquid mixing box, and the mixed foam is sprayed out through the spray head by the one-way membrane pump. In this way, the unidirectional membrane pump needs to be in contact with foam and/or foam concentrate for a long time, so that the unidirectional membrane in the pump is easy to be sticky and ineffective, the unidirectional membrane pump is dead, and the pump and/or the spray head are blocked, and the efficiency is low.

Disclosure of Invention

The embodiment of the application provides a foam generating device, which can improve the current situation that in the existing mode, a one-way membrane pump needs to be in contact with foam and/or foam liquid for a long time, so that the one-way membrane in the pump is easy to be sticky and ineffective, the one-way membrane pump is easy to crash, the pump and/or a spray head are blocked, and the cleaning efficiency is low.

In order to solve the technical problem, the application adopts a technical scheme that: there is provided a foam generating device comprising: the liquid mixing device comprises a first liquid supply assembly, a liquid mixing container, a second liquid supply assembly and a spray head assembly. First confession liquid subassembly includes first stock solution container and piston pump, first stock solution container with the piston pump is connected, first stock solution container is used for storing the foam concentrate, and/or gives the piston pump supplies the foam concentrate, the piston pump includes the pump body and piston rod, the piston rod with synthetic piston chamber is enclosed jointly to the pump body, the piston chamber is used for inhaling or discharges the foam concentrate, the piston chamber with the setting is separated to the part of the activity of piston rod. The liquid mixing container is connected to the piston pump, and the piston pump supplies foam liquid to the liquid mixing container. The second liquid supply assembly is connected with the liquid mixing container and used for storing water and/or supplying water to the liquid mixing container. The foam liquid mixed by the spray head assembly flows into the spray head assembly from the liquid mixing container and is sprayed out after being mixed with air.

Optionally, the pump body is provided with inlet and liquid outlet, the inlet with first liquid feed assembly intercommunication, the liquid outlet with mix liquid container intercommunication, inlet and liquid outlet all set up in the piston cavity. The piston rod moves between a first preset position and a second preset position, the first preset position and the second preset position are arranged oppositely along a preset direction, and the first preset position is farther away from the liquid inlet and the liquid outlet relative to the second preset position. When the piston rod moves from the first preset position to the second preset position, the inner space of the piston cavity is reduced. When the piston rod moves from the first preset position to the second preset position, the inner space of the piston cavity is increased.

Optionally, the piston pump comprises a first one-way valve and a second one-way valve, and the first one-way valve is arranged at the liquid inlet and used for preventing foam liquid flowing into the piston cavity from flowing backwards to the first liquid storage container; the second one-way valve is arranged at the liquid outlet and used for preventing foam liquid flowing into the liquid mixing container from reversely flowing back to the piston cavity.

Optionally, the foam generating device further comprises a driving assembly, the driving assembly comprises a driver, a first gear and a second gear, the driver drives the first gear to rotate around the preset direction, the first gear is meshed with the second gear, and the first gear drives the second gear to rotate around the preset direction. The piston rod comprises a screw rod and a piston head, the screw rod is connected with the piston head, the screw rod is meshed with the second gear, the second gear drives the screw rod to rotate around the preset direction, the piston head is driven by the screw rod to move along the preset direction relative to the pump body, and one side, far away from the screw rod, of the piston head and the inner wall of the pump body jointly enclose the piston cavity.

Optionally, the spray head assembly includes a spray head, the spray head is mounted on a side of the first gear away from the driver, and the first gear drives the spray head to rotate. The foam generating device further comprises a flexible pipe, one end of the flexible pipe is connected with the liquid mixing container, and the other end of the flexible pipe is connected with the spray head.

Optionally, the sprayer includes a sprayer support and a sprayer main body, the sprayer support is installed on one side of the first gear far away from the driver, the sprayer main body is installed on the sprayer support, the first gear drives the sprayer support to rotate, the sprayer support drives the sprayer main body to rotate, and the sprayer main body is connected with the flexible pipe.

Optionally, the shower nozzle main part is provided with spouts the chamber, admit air through-hole, feed liquor through-hole and play liquid through-hole, admit air through-hole and feed liquor through-hole in spout the intracavity intercommunication, it is used for mixing foam liquid and air to spout the chamber, go out the liquid through-hole and be used for spouting foam liquid, water and the air after mixing, the through-hole that admits air encircles the setting of shower nozzle main part.

Optionally, the spray head assembly further comprises a foaming net, the foaming net is installed at the liquid outlet through hole, and the foaming net is used for converting the mixed foam liquid, water and air into foam to be sprayed out.

Optionally, the second liquid supply assembly includes a multi-head water valve, one end of the multi-head water valve is communicated with a water source of the toilet, and the other end of the multi-head water valve is communicated with the liquid mixing container.

In order to solve the above technical problem, another technical solution adopted by the present application is: a toilet is provided, which comprises the foam generating device and a toilet main body, wherein the foam generating device is arranged on the toilet main body and is used for spraying foam to clean the toilet main body.

The beneficial effects of the embodiment of the application are that: in contrast to the prior art, embodiments of the present application provide a foam generating apparatus that includes a first liquid supply assembly, a liquid mixing container, a second liquid supply assembly, and a spray head assembly. First confession liquid subassembly includes first stock solution container and piston pump, first stock solution container with the piston pump is connected, first stock solution container is used for storing the foam concentrate, and/or gives the piston pump supplies the foam concentrate, the piston pump includes the pump body and piston rod, the piston rod with synthetic piston chamber is enclosed jointly to the pump body, the piston chamber is used for inhaling or discharges the foam concentrate, the piston chamber with the setting is separated to the part of the activity of piston rod. The liquid mixing container is connected to the piston pump, and the piston pump supplies foam liquid to the liquid mixing container. The second liquid supply assembly is connected with the liquid mixing container and used for storing water and/or supplying water to the liquid mixing container. The mixed foam liquid flows into the spray head assembly from the liquid mixing container, and is mixed with air and then sprayed out. With the above configuration, the piston pump sucks or discharges the foam concentrate by enlarging or reducing the piston chamber, and the foam concentrate is mixed with water in the mixing container, and finally mixed with air at the head and discharged. So that the foam liquid does not need to contact with the one-way membrane, and the working efficiency of the foam generating device is improved.

Drawings

One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.

FIG. 1 is a perspective view of a toilet provided by one embodiment of the present application;

FIG. 2 is a partial schematic view of a toilet provided by one embodiment of the present application;

FIG. 3 is an exploded view of a foam generating device provided in accordance with an embodiment of the present application;

FIG. 4 is a cross-sectional view of the plane A of FIG. 2 as provided by one embodiment of the present application;

FIG. 5 is a schematic view of a showerhead body according to one embodiment of the present application;

FIG. 6 is a cross-sectional view of the plane B of FIG. 5 as provided by one embodiment of the present application.

The reference numbers are as follows:

Detailed Description

In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, which respectively illustrate a perspective view of a toilet 1000 according to an embodiment of the present disclosure and a partial schematic view of the toilet 1000 according to an embodiment of the present disclosure, the toilet 1000 includes a foam generating device 100 and a toilet main body 200, the foam generating device 100 is mounted on the toilet main body 200, and the foam generating device 100 is used for spraying foam to clean the toilet main body 1000. Wherein, the material of the closestool main body 200 is ceramic, the closestool main body 200 comprises a closestool cover 210 and a seat body 220, the seat body 220 is provided with a flushing space 221, the flushing space 221 is used for flushing excrement, and the foam generating device 100 is arranged on one side of the seat body 220 facing the flushing space 221 and is used for flushing the inner wall of the flushing space 221 so as to achieve the effect of cleaning the seat body 220. It will be appreciated that in other embodiments, the foam generating device 100 may be mounted to a smart toilet seat for use by mounting the smart toilet seat to a toilet.

Referring to fig. 2 to 4, fig. 3 and 4 respectively show an exploded view of the foam generating device 100 provided in one embodiment of the present application and a cross-sectional view of the plane a of fig. 2 provided in one embodiment of the present application, in combination with other drawings. Foam generating device 100, comprising: a first liquid supply assembly 10, a liquid mixing container 20, a second liquid supply assembly 30, and a spray head assembly 40. The first liquid supply assembly 10 comprises a first liquid storage container 11 and a piston pump 12, the first liquid storage container 11 is connected with the piston pump 12, the first liquid storage container 11 is used for storing foam liquid and/or supplying the foam liquid to the piston pump 12, the piston pump 12 comprises a pump body 121 and a piston rod 122, the piston rod 122 and the pump body 121 jointly enclose a piston cavity 123, the piston cavity 123 is used for sucking or discharging the foam liquid, and the piston cavity 123 is separated from a movable part of the piston rod 122. The liquid mixing container 20 is connected to the piston pump 12, and the piston pump 12 supplies the foam liquid to the liquid mixing container 20. The second liquid supply assembly 30 is connected with the liquid mixing container 20, and the second liquid supply assembly 30 is used for storing water and/or supplying water to the liquid mixing container 20. The foam liquid mixed by the head unit 40 flows into the head unit 40 from the liquid mixing container 20, and is mixed with air and then discharged. The foam liquid is used for lubricating the inner wall of the closestool, reducing the adhesion of stains to closestool ceramics, facilitating more efficient flushing during flushing and simultaneously playing the roles of odor isolation and water splashing prevention; the components of the composition include but are not limited to parachlorometaxylenol, organic acid, acid synergist, AOS powder, film forming agent, corrosion inhibitor and the like. Alternatively, the first reservoir 11 may be a separate cover button that is opened to receive foam concentrate, or may be an integral open reservoir through which foam concentrate is injected, the first reservoir 11 being generally cylindrical, while in other embodiments the first reservoir may be cubic or other irregular shape to fully utilize the space within the body 220 for foam concentrate storage. Optionally, the piston rod 122 is made of plastic, so that the foam liquid is prevented from corroding the piston rod, and the process is simple and durable. Alternatively, in the mixing container 20, the water and the foam concentrate may be naturally mixed, that is, sufficiently mixed by the flow rate of the water and the foam concentrate itself when flowing into the mixing container 20; alternatively, a stirrer may be added to the mixing container 20 to facilitate thorough mixing of the water and the foam concentrate. While the mixing container 20 is cubic, in other embodiments, the mixing container 20 may be cylindrical, and in order to facilitate the mixing of the foam liquid and the water, the extension lines of the connection ports of the second liquid supply assembly 30 and the mixing container 20 are tangent to the circle of the mixing container 20, and the extension lines of the connection ports of the piston pump 12 and the mixing container 20 are tangent to the circle of the mixing container 20, so that the foam liquid and the water flowing into the mixing container 20 can flow along the inner wall of the mixing container 20 to facilitate the mixing.

For the piston pump 12, refer to fig. 4 in combination with other figures. The pump body 121 of the piston pump 12 is provided with a liquid inlet 1211 and a liquid outlet 1212, the liquid inlet 1211 is communicated with the first liquid supply assembly 10, the liquid outlet 1212 is communicated with the liquid mixing container 20, and the liquid inlet 1211 and the liquid outlet 1212 are both arranged in the piston cavity 123. The piston rod 122 moves between a first preset position and a second preset position, the first preset position and the second preset position are opposite to each other along the preset direction X, and the first preset position is farther away from the liquid inlet 1211 and the liquid outlet 1212 than the second preset position. When the piston rod 122 moves from the first preset position to the second preset position, the inner space of the piston chamber 123 decreases. When the piston rod 122 moves from the first preset position to the second preset position, the inner space of the piston chamber 123 increases. It is understood that, in order to facilitate the flow of the foam concentrate, liquid inlet 1211 and liquid outlet 1212 are disposed at the middle or bottom of piston chamber 123, wherein the middle refers to the wall surface of the middle section of pump body 121, and the bottom refers to the side of pump body 121 away from piston rod 122. Disposing both inlet 1211 and outlet 1212 at the middle or bottom of piston chamber 123 may also prevent foam liquid from flowing to piston rod 122 and eroding piston rod 122. It will be appreciated that when the piston rod 122 moves from the first preset position to the second preset position, the internal space of the piston cavity 123 decreases, so that a positive pressure is formed in the piston cavity 123, and the foam in the piston cavity 123 is pressed toward the mixing container 20; when the piston rod 122 moves from the first preset position to the second preset position, the internal space of the piston cavity 123 increases, so that a negative pressure is formed in the piston cavity 123, and the foam liquid in the first liquid storage container 11 is sucked into the piston cavity 123.

Further, please refer to fig. 4 in combination with other figures. The piston pump 12 comprises a first check valve 124 and a second check valve 125, wherein the first check valve 124 is arranged at the liquid inlet 1211 and is used for preventing the foam concentrate flowing into the piston cavity 123 from flowing backwards to the first liquid storage container 11; a second check valve 125 is disposed at the liquid outlet 1212 for preventing foam liquid flowing into the liquid mixing container 20 from flowing back to the piston chamber 123.

In the embodiment of the present application, please refer to fig. 2 to 4 in combination with other figures. The foam generating device 100 further comprises a driving assembly 50, wherein the driving assembly 50 comprises a driver 51, a first gear 52 and a second gear 53, the driver 51 drives the first gear 52 to rotate around the preset direction X, the first gear 52 is meshed with the second gear 53, and the first gear 52 drives the second gear 53 to rotate around the preset direction X. The piston rod 122 comprises a screw 1221 and a piston head 1222, the screw 1221 is connected with the piston head 1222, the screw 1221 is meshed with the second gear 53, the second gear 53 drives the screw 1221 to rotate around the preset direction X, the screw 1221 drives the piston head 1222 to move relative to the pump body 121 along the preset direction X, and one side of the piston head 1222, away from the screw 1221, and the side of the piston head 1222 and the inner wall of the pump body 121 jointly enclose the piston cavity 123. The screw 1221 and piston head 1222 in the embodiment of the present application are integrally formed as a single piece, which facilitates the manufacture of the piston rod 122; in other embodiments, the threaded rod 1221 and the piston head 1222 can be separate pieces, thereby facilitating assembly, disassembly, and replacement of parts. It will be appreciated that the drive 51 includes a servo motor, a micro ac motor, or the like. It is worth mentioning that the piston head 1222 abuts the inner wall of the pump body 121 and is coated with an oil film to lubricate the piston head 1222 and the pump body 121, the oil film adhering to the inner wall of the pump body 121 and not reacting with the foam concentrate. It should be noted that the circumference of the first gear 52 is larger than the circumference of the second gear 53, so that the first gear 52 only rotates by a small arc to drive the second gear 53 to rotate by a large arc, thereby driving the piston rod 122 to move along the preset direction X; in other embodiments, the gear ratios of the first gear 52 and the second gear 53 may be varied as desired by the user so that the piston pump 12 may draw or push foam concentrate slowly or more quickly.

Further, please refer to fig. 3, fig. 5 and fig. 6, wherein fig. 5 and fig. 6 respectively illustrate a schematic view of a showerhead body 412 provided in one embodiment of the present application and a cross-sectional view of a plane B of fig. 5 provided in one embodiment of the present application, in combination with the other figures. The nozzle 41 includes a nozzle holder 411 and a nozzle body 412, the nozzle holder 411 is mounted on a side of the first gear 52 away from the driver 51, the nozzle body 412 is mounted on the nozzle holder 411, the first gear 52 drives the nozzle holder 411 to rotate, the nozzle holder 411 drives the nozzle body 412 to rotate, and the nozzle body 412 is connected with the flexible pipe 60. The nozzle holder 411 is bent, so that the foam sprayed from the nozzle body 412 can be sprayed to more surfaces of the water-flushing space 221 of the seat 220. It is understood that the flexible tube 60 comprises a rubber tube, and the first gear 52 drives the nozzle holder 411 to rotate by using the bendable characteristic of the flexible tube 60.

It can be understood that the rubber tubes are disposed between the first liquid storage container 11 and the piston pump 12, between the piston pump 12 and the liquid mixing container 20, and between the liquid mixing container 20 and the second liquid supply assembly 30, which is convenient for replacement, has good sealing performance, is not easy to react between the foam liquid and water, and is convenient for the foam generating device 100 to be mounted on the base 220.

Please refer to fig. 6 in conjunction with other figures for the showerhead body 412. The nozzle body 412 is provided with a spraying cavity 4121, an air inlet through hole 4122, a liquid inlet through hole 4123 and a liquid outlet through hole 4124, the air inlet through hole 4122 and the liquid inlet through hole 4123 are communicated in the spraying cavity 4121, the spraying cavity 4121 is used for mixing foam liquid and air, the liquid outlet through hole 4124 is used for spraying the mixed foam liquid, water and air, and the air inlet through hole 4122 is arranged around the nozzle body 412. It will be appreciated that the exit opening 4124 is partially raised toward the chamber 4121 so that there is room for further mixing of the air, foam concentrate and water after entering the chamber 4121. In other embodiments, the nozzle body 412 is further provided with an active air suction device, such as a micro-fan, an air pump, etc., to push air from the air inlet hole 4122 into the nozzle chamber 4121.

Further, please refer to fig. 3 and fig. 6 in combination with other figures. The nozzle assembly 40 further includes a foaming net 42, the foaming net 42 is installed at the liquid outlet hole 4124, and the foaming net 42 is used for converting the mixed foam liquid, water and air into foam to be sprayed. It is understood that the foaming web 42 is a structure in which the mixture of air, foam concentrate and water is directly sprayed through a plurality of fine mesh holes, and the mixture of air, foam concentrate and water is pushed to the surface of the foaming web 42 by pressure, so that the air, foam concentrate and water are further mixed sufficiently while generating foam and sprayed onto the inner wall of the flushing space 221.

In the embodiments of the present application, please refer to fig. 3 in combination with other figures. The second liquid supply assembly 30 comprises a multi-head water valve 31, one end of the multi-head water valve 31 is communicated with a water source of the toilet, and the other end of the multi-head water valve 31 is communicated with the liquid mixing container 20. In other embodiments, the second liquid supply assembly 30 further comprises a water storage container and a water pump, wherein the water storage container pumps water to the multi-head water valve 31 through the water pump, and then flows into the liquid mixing container 20.

The embodiment of the application provides a foam generating device 100, and the foam generating device 100 comprises a first liquid supply assembly 10, a liquid mixing container 20, a second liquid supply assembly 30 and a spray head assembly 40. The first liquid supply assembly 10 comprises a first liquid storage container 11 and a piston pump 12, the first liquid storage container 11 is connected with the piston pump 12, the first liquid storage container 11 is used for storing foam liquid and/or supplying the foam liquid to the piston pump 12, the piston pump 12 comprises a pump body 121 and a piston rod 122, the piston rod 122 and the pump body 121 jointly enclose a piston cavity 123, the piston cavity 123 is used for sucking or discharging the foam liquid, and the piston cavity 123 is separated from a movable part of the piston rod 122. The liquid mixing container 20 is connected to the piston pump 12, and the piston pump 12 supplies the foam concentrate to the liquid mixing container 20. The second liquid supply assembly 30 is connected with the liquid mixing container 20, and the second liquid supply assembly 30 is used for storing water and/or supplying water to the liquid mixing container 20. The mixed foam liquid flows from the liquid mixing container 20 into the head unit 40, and is mixed with air and then discharged. With the above-described structure, the piston pump 12 sucks or discharges the foam liquid by enlarging or reducing the piston chamber 123, and the foam liquid is mixed with water in the liquid mixing container 20, and finally mixed with air at the head 41 and ejected. So that the foam concentrate does not need to contact with the unidirectional film, and the working efficiency of the foam generating device 100 is improved.

Based on the same inventive concept, the present application also provides a toilet 1000, the toilet 1000 comprising a foam generating device 100, and a toilet main body 200. The foam generating device 100 is mounted on the toilet main body 200, the foam generating device 100 is used for spraying foam to clean the toilet main body 200, and the foam generating device 100 and the toilet main body 200 have the same structural functions as those in the above embodiments, and are not described in detail here, so that the toilet 1000 can also improve the current situation that in the current mode, the unidirectional membrane pump needs to be in contact with the foam and/or foam liquid for a long time, the unidirectional membrane in the pump is easily sticky and ineffective, the unidirectional membrane pump is halted, the pump and/or the spray head are blocked, and the cleaning efficiency is low.

It should be noted that the description of the present application and the accompanying drawings set forth preferred embodiments of the present application, however, the present application may be embodied in many different forms and is not limited to the embodiments described in the present application, which are not intended as additional limitations to the present application, but are provided for the purpose of providing a more thorough understanding of the present disclosure. The above features are combined with each other to form various embodiments not listed above, and all of them are regarded as the scope described in the present specification; further, modifications and variations may occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.

Claims (10)

1. A foam generating device, comprising:

the first liquid supply assembly comprises a first liquid storage container and a piston pump, the first liquid storage container is connected with the piston pump, the first liquid storage container is used for storing foam concentrate and/or supplying the foam concentrate to the piston pump, the piston pump comprises a pump body and a piston rod, the piston rod and the pump body jointly enclose a piston cavity, the piston cavity is used for sucking or discharging the foam concentrate, and the piston cavity is separated from the movable part of the piston rod;

a liquid mixing container connected to the piston pump, the piston pump supplying foam liquid to the liquid mixing container;

the second liquid supply assembly is connected with the liquid mixing container and is used for storing water and/or supplying water to the liquid mixing container;

and the mixed foam liquid flows into the spray head assembly from the liquid mixing container and is mixed with air and then sprayed out.

2. The foam generating device as claimed in claim 1, wherein the pump body is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the first liquid supply assembly, the liquid outlet is communicated with the liquid mixing container, and the liquid inlet and the liquid outlet are both arranged in the piston cavity;

the piston rod moves between a first preset position and a second preset position, the first preset position and the second preset position are arranged oppositely along a preset direction, and the first preset position is farther away from the liquid inlet and the liquid outlet relative to the second preset position;

when the piston rod moves from the first preset position to the second preset position, the inner space of the piston cavity is reduced;

when the piston rod moves from the first preset position to the second preset position, the inner space of the piston cavity is increased.

3. The foam generating device as claimed in claim 2, wherein the piston pump comprises a first check valve and a second check valve, the first check valve is disposed at the liquid inlet for preventing foam liquid flowing into the piston chamber from flowing backwards into the first liquid storage container; the second one-way valve is arranged at the liquid outlet and used for preventing foam liquid flowing into the liquid mixing container from reversely flowing back to the piston cavity.

4. The foam generating device according to any one of claims 1 to 3, further comprising a driving assembly, wherein the driving assembly comprises a driver, a first gear and a second gear, the driver drives the first gear to rotate around a preset direction, the first gear and the second gear are engaged, and the first gear drives the second gear to rotate around the preset direction;

the piston rod comprises a screw rod and a piston head, the screw rod is connected with the piston head, the screw rod is meshed with the second gear, the second gear drives the screw rod to rotate around the preset direction, the piston head is driven by the screw rod to move along the preset direction relative to the pump body, and one side, far away from the screw rod, of the piston head and the inner wall of the pump body jointly enclose the piston cavity.

5. The foam generating apparatus as claimed in claim 4, wherein said spray head assembly comprises a spray head, said spray head being mounted on a side of said first gear remote from said actuator, said first gear driving said spray head to rotate;

the foam generating device further comprises a flexible pipe, one end of the flexible pipe is connected with the liquid mixing container, and the other end of the flexible pipe is connected with the spray head.

6. The foam generating apparatus according to claim 5, wherein the nozzle comprises a nozzle holder and a nozzle body, the nozzle holder is mounted on a side of the first gear away from the actuator, the nozzle body is mounted on the nozzle holder, the first gear drives the nozzle holder to rotate, the nozzle holder drives the nozzle body to rotate, and the nozzle body is connected to the flexible pipe.

7. The foam generating device as claimed in claim 6, wherein the nozzle body is provided with a spraying chamber, an air inlet through hole, a liquid inlet through hole and a liquid outlet through hole, the air inlet through hole and the liquid inlet through hole are communicated with each other in the spraying chamber, the spraying chamber is used for mixing foam liquid and air, the liquid outlet through hole is used for spraying the mixed foam liquid, water and air, and the air inlet through hole is arranged around the nozzle body.

8. The foam generating apparatus as claimed in claim 7, wherein the spray head assembly further comprises a foaming net installed at the liquid outlet hole, the foaming net being used to convert the mixed foam liquid, water and air into foam to be sprayed.

9. The foam generating apparatus as claimed in claim 1, wherein the second liquid supply assembly comprises a multi-head water valve, one end of the multi-head water valve is connected to a water source of the toilet, and the other end of the multi-head water valve is connected to the liquid mixing container.

10. A toilet bowl comprising the foam generating device as claimed in any one of claims 1 to 9, and a toilet bowl main body to which the foam generating device is mounted, the foam generating device serving to eject foam for cleaning the toilet bowl main body.

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