Surface cleaning device and water tank therefor

Abstract

The application discloses a surface cleaning device and a water tank thereof. The water tank comprises a tank body provided with an inner cavity; a diaphragm configured as a bag is arranged in the inner cavity and separates the inner cavity into a first chamber and a second chamber; a one-way valve is communicated with the inside and outside of the second chamber at two ends and can only pass fluid flowing into the second chamber; and the second chamber is provided with a water outlet for connecting a water pump. The technical scheme provided by the application aims to solve the problem of tearing of a flexible diaphragm in a water tank of a surface cleaning device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical appliances, in particular to a surface cleaning device and a water tank thereof. BACKGROUND

[0002] The floor cleaning machine can greatly facilitate the cleaning work of the family and reduce the housework intensity of people.

[0003] The floor cleaning machine is different from the traditional sweeping and dust collector, and needs to be immersed in water or use other liquid cleaning agent to clean the floor. Therefore, the floor cleaning machine generally includes a clean water tank for storing clean water or cleaning liquid. At the same time, the garbage generated during the cleaning process also needs to be collected with the waste water, so most of the floor cleaning machines also have a waste water tank for storing waste water and garbage.

[0004] The related technology proposes a clean and dirty integrated water tank, which usually uses a flexible diaphragm to divide the tank body into a clean water tank and a dirty water tank. As the cleaning liquid stored in the clean water tank is continuously consumed, the absolute value of the negative pressure formed in the clean water tank becomes larger and larger, and it becomes more and more difficult for the water pump to pump the cleaning liquid out of the clean water tank. The deformation of the diaphragm towards the clean water tank side becomes larger and larger, thereby causing the diaphragm to be torn. SUMMARY

[0005] The main purpose of the present application is to provide a water tank for a surface cleaning device, which aims to solve the technical problem of tearing of the flexible diaphragm in the clean and dirty integrated water tank.

[0006] To achieve the above-mentioned purpose, the present application proposes a water tank for a surface cleaning device, which comprises:

[0007] A tank body is provided with an inner cavity;

[0008] A diaphragm is configured in a bag shape, arranged in the inner cavity and separates the inner cavity into a first chamber and a second chamber;

[0009] A one-way valve is connected to the inside and outside of the second chamber at both ends, and can only pass through the fluid flowing into the second chamber;

[0010] The second chamber is provided with a water outlet for connecting a water pump.

[0011] In one illustrative embodiment, the one-way valve is configured to open when the pressure in the second chamber is negative and higher than a set first pressure threshold;

[0012] The first pressure threshold is set according to the pressure in the second chamber when the diaphragm is torn or irreversibly deformed.

[0013] In one illustrative embodiment, the one-way valve is configured to open when the pressure in the second chamber is negative and lower than a set second pressure threshold;

[0014] The second pressure threshold is set for the pressure inside the second chamber when the diaphragm is turned from arching towards the first chamber to arching towards the second chamber.

[0015] In one illustrative embodiment, the opening pressure of the one-way valve is 0.2kPa to 3kPa.

[0016] In one illustrative embodiment, the one-way valve is disposed on the sidewall of the second chamber.

[0017] In one illustrative embodiment, the one-way valve is a duckbill intake valve or a spring-type one-way valve.

[0018] In one illustrative embodiment, the first chamber is used to contain dirt, and the second chamber is used to contain cleaning liquid.

[0019] In one illustrative embodiment, the tank further comprises a sewage flow channel extending into the first chamber;

[0020] The sewage flow channel is provided with a sewage outlet for inputting dirt into the first chamber.

[0021] At least a portion of the sewage flow channel abuts against the top wall of the first chamber.

[0022] In one illustrative embodiment, the sewage flow channel comprises a first section extending along the top wall and a second section connected to the first section at one end.

[0023] The sewage outlet is disposed at the other end of the second section, and the first section and the second section are bent by 90°.

[0024] In one illustrative embodiment, the present embodiment further proposes a surface cleaning device comprising the water tank as described above and a water pump connected to the water outlet.

[0025] In the technical solution of the present application, the water pump is started to pump out the cleaning liquid in the second chamber, forming a negative pressure in the second chamber. When the difference between the pressure outside the second chamber and the negative pressure in the second chamber reaches the opening pressure of the one-way valve, the one-way valve opens, the inside and outside of the second chamber are connected, and the fluid outside the second chamber flows into the second chamber through the one-way valve, so that the inside and outside pressures of the second chamber are balanced. In this way, after the diaphragm bears a certain negative pressure, the one-way valve will open, thereby avoiding the diaphragm being torn or irreversibly deformed due to excessive negative pressure in the second chamber. At the same time, since the inside and outside pressures of the second chamber are balanced, the water pump will maintain the same speed to pump out the cleaning liquid in the second chamber. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below only show some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0027] Figure 1 A structure schematic diagram of a water tank in an embodiment of the present application;

[0028] Figure 2 A front view schematic diagram of a water tank in an embodiment of the present application Figure 1 ;

[0029] Figure 3 A front view schematic diagram of a water tank in an embodiment of the present application Figure 2 ;

[0030] Figure 4 A structure schematic diagram of a surface cleaning device in an embodiment of the present application.

[0031] Explanation of the reference signs:

[0032] 100, water tank; 1, tank body; 11, top plate; 12, bottom plate; 13, side plate; 14, first chamber; 15, second chamber; 16, sewage flow channel; 161, sewage inlet; 163, sewage outlet; 164, first section; 165, second section; 166, straight section; 167, bending section; 2, diaphragm; 3, one-way valve; 200, machine body.

[0033] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0035] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0036] In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description and cannot be understood as indicating or implying the relative importance of the technical features indicated or implying the number of technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0039] As Figures 1 to 3 shown, Figure 1 , Figure 2 A water tank 100 of a surface cleaning device in the present embodiment is shown. The surface cleaning device can be a scrubber. The water tank 100 comprises a tank body 1, which can be configured to comprise a top plate 11, a bottom plate 12 and a side plate 13. The top plate 11 is located above the bottom plate 12.

[0040] The top plate 11 and the bottom plate 12 can be configured as a flat plate structure. The side plate 13 is arranged between the top plate 11 and the bottom plate 12. The side plate 13 can be cylindrical, and the top plate 11 and the bottom plate 12 cover the upper and lower ends of the side plate 13, respectively. The top plate 11, the bottom plate 12 and the side plate 13 enclose the tank body 1, and the inner walls of the top plate 11, the bottom plate 12 and the side plate 13 enclose the inner cavity of the tank body 1. A diaphragm 2 is arranged in the inner cavity of the tank body 1, as shown in Figure 2 The diaphragm 2 separates the inner cavity of the tank body 1 into two chambers, i.e. a first chamber 14 located above and a second chamber 15 located below. The diaphragm 2 constitutes the bottom wall of the first chamber 14 and the top wall of the second chamber 15. The diaphragm 2 is located between the top plate 11 and the bottom plate 12, and the edges thereof can be bonded to the inner wall of the side plate 13, which is simple to install and low in cost.

[0041] The diaphragm 2 can be provided in a bag-like structure, and the diaphragm 2 is flexible. The diaphragm 2 can be a plastic film. The edge of the diaphragm 2 is connected to the inner circumferential wall of the side plate 13.

[0042] The top plate 11 and the bottom plate 12 can be plate-like structures parallel to the horizontal plane, and the side plate 13 can be a plate-like structure arranged vertically. As shown in the figure, the cross section of the first chamber 14 can be provided in a rectangular or cylindrical shape, etc. The first chamber 14 is used to contain dirt, including sewage and impurities. The second chamber 15 is used to contain cleaning liquid, which can be clean water or an aqueous solution. The aqueous solution can be a mixture of clean water and cleaning agent. The water tank 100 realizes the integration of the clean and dirty tank bodies, making the structure of the surface cleaning device provided with the water tank 100 more compact, the appearance more compact, and the storage space smaller. Figure 2

[0043] When the surface cleaning device is working, the cleaning liquid is output from the second chamber 15 to clean the ground, and at the same time, the first chamber 14 recovers the sewage and garbage after cleaning the ground. The first chamber 14 is arranged above the second chamber 15 to facilitate the cleaning of the dirt accumulated in the first chamber 14, making the overall arrangement of the water tank 100 more reasonable and more in line with the design requirements of human-computer operation comfort.

[0044] An outlet (not shown in the figure) is arranged on the second chamber 15, which can be arranged on the bottom plate 12 or on the side plate 13 around the second chamber 15. The outlet is connected in communication with the water inlet of the water pump, so that the water pump is connected to the second chamber 15, and the water pump can pump out the cleaning liquid in the second chamber 15.

[0045] In the initial stage of the operation of the water tank 100, since the dirt to be contained in the first chamber 14 is relatively small, the diaphragm 2 can be arched to the first chamber 14, so that the second chamber 15 has a larger volume and can contain more cleaning liquid. As the working time increases, the water pump pumps out the cleaning liquid in the second chamber 15 and stores it in the first chamber 14. The dirt stored in the second chamber 15 gradually increases, and the cleaning liquid stored in the second chamber 15 gradually decreases. Under the action of the negative pressure in the second chamber 15, the diaphragm 2 gradually turns down, the volume of the first chamber 14 increases to accommodate more dirt, and under the action of the negative pressure, the diaphragm 2 can finally be arched downward. The diaphragm 2 can make the volumes of the first chamber 14 and the second chamber 15 in the water tank 100 change in a "this increases and that decreases" manner. Under the limited volume of the water tank 100, in combination with the different working states of the water tank 100 and the changing demand for the volumes of the two chambers, the space in the water tank 100 is reasonably utilized.

[0046] ​The water tank 100 further comprises a one-way valve 3. The two ends of the one-way valve 3 are respectively communicated with the inside of the second chamber 15 and the outside of the second chamber 15. The end of the one-way valve 3 communicated with the outside of the second chamber 15 can be communicated with the ambient environment. The one-way valve 3 can only pass the fluid flowing from the outside of the second chamber 15 to the inside of the second chamber 15. The fluid flowing from the inside of the second chamber 15 to the outside of the second chamber 15 along the one-way valve 3 is blocked by the one-way valve 3. The fluid can be air, oxygen or other gas. The one-way valve 3 can be arranged on the side wall or bottom wall constituting the second chamber 15, i.e. on the side plate 13 or the bottom plate 12. The one-way valve 3 can also be arranged on a gas pressure balance pipe, one end of which is communicated with the inside of the second chamber 15 and the other end of which is communicated with the outside of the second chamber 15.

[0047] After the water pump is started, the cleaning liquid in the second chamber 15 is pumped and drained, and a negative pressure is formed in the second chamber 15. When the difference between the pressure outside the second chamber 15 and the negative pressure of the second chamber 15 reaches the opening pressure of the one-way valve 3, the one-way valve 3 opens, the inside and outside of the second chamber 15 are communicated, and the fluid outside the second chamber 15 flows into the second chamber 15 through the one-way valve 3, so that the pressure of the second chamber 15 is balanced. In this way, after the diaphragm 2 bears a certain negative pressure, the one-way valve 3 will open, thereby avoiding the diaphragm 2 being torn or irreversibly deformed due to excessive negative pressure in the second chamber 15. At the same time, after the pressure inside and outside the second chamber 15 is balanced, the water pump can also maintain the water output unchanged without being affected by the negative pressure.

[0048] In an exemplary embodiment, the one-way valve 3 is a duckbill valve, also known as a back pressure flexible check valve. The duckbill valve is usually made of elastic neoprene rubber and artificial fibers, and has elasticity. The duckbill valve is provided with a duckbill outlet located in the second chamber 15. The duckbill outlet is folded under its own elasticity when the pressure difference between the inside and outside of the second chamber 15 does not reach its opening pressure. The duckbill outlet opens to communicate the inside and outside of the second chamber 15 when the pressure difference between the inside and outside of the second chamber 15 reaches its opening pressure. The duckbill valve has a long service life, no failure, maintenance-free, good sealing, small opening pressure, easy to install, low cost, small size and corrosion resistance.

[0049] The one-way valve 3 can also be a spring type one-way valve. The spring type one-way valve controls the valve flap by a spring. When the pressure difference between the inside and outside of the second chamber 15 does not reach its opening pressure, the spring presses the valve flap to seal the passage in the valve seat, and the inside and outside of the second chamber 15 cannot be communicated through the one-way valve 3. When the pressure difference between the inside and outside of the second chamber 15 reaches its opening pressure, the pressure of the fluid lifts the spring-controlled valve flap, the passage in the valve seat is opened, and the inside and outside of the second chamber 15 are communicated through the one-way valve 3.

[0050] In an exemplary embodiment, the one-way valve 3 is configured to open when the pressure in the second chamber 15 is negative and the pressure is higher than a first pressure threshold. That is, the opening pressure of the one-way valve 3 is less than the difference between the external pressure of the second chamber 15 and the first pressure threshold. The first pressure threshold is set according to the pressure in the second chamber 15 when the diaphragm 2 is torn or irreversibly deformed. The first pressure threshold can be the minimum negative pressure required in the second chamber 15 for the diaphragm 2 to be torn or irreversibly deformed.

[0051] The first pressure threshold can be measured in a test environment. In the test, the second chamber 15 is first filled with water until the diaphragm 2 arches towards the first chamber 14, and then the one-way valve 3 is blocked. After starting to measure the pressure in the second chamber 15, the deformation of the diaphragm 2 is observed. When the diaphragm 2 is observed to be irreversibly deformed or torn, the pressure in the second chamber 15 at that time is the first pressure threshold.

[0052] The opening pressure of the one-way valve 3 is less than the difference between the external pressure of the second chamber 15 and the first pressure threshold. In this way, the opening pressure of the one-way valve 3 can be prevented from being too large to cause the diaphragm 2 to be torn or irreversibly deformed by the negative pressure in the second chamber 15.

[0053] In an exemplary embodiment, the one-way valve 3 is configured to open when the pressure in the second chamber 15 is negative and the pressure is lower than a second pressure threshold. The first pressure threshold is lower than the second pressure threshold. That is, the opening pressure of the one-way valve 3 is greater than the difference between the external pressure of the second chamber 15 and the second pressure threshold. The second pressure threshold is set according to the pressure in the second chamber 15 when the diaphragm 2 is flipped from arching towards the first chamber 14 to arching towards the second chamber 15. The second pressure threshold can be the minimum negative pressure required in the second chamber 15 for the diaphragm 2 to be flipped from arching towards the first chamber 14 to arching towards the second chamber 15.

[0054] The second pressure threshold can be measured in a test environment. In the test, the second chamber 15 is first filled with water until the diaphragm 2 arches towards the first chamber 14, and then the one-way valve 3 is blocked. After starting to measure the pressure in the second chamber 15, the deformation of the diaphragm 2 is observed. When the diaphragm 2 is observed to arch towards the second chamber 15, the pressure in the second chamber 15 at that time is the second pressure threshold.

[0055] By setting the one-way valve 3 to open only when the pressure in the second chamber 15 is lower than the second pressure threshold, the one-way valve 3 can be prevented from opening before the diaphragm 2 is flipped from arching towards the first chamber 14 to arching towards the second chamber 15, so that the diaphragm 2 can complete the flip.

[0056] In one illustrative embodiment, the opening pressure of the one-way valve 3 is preferably 0.2 kPa to 3 kPa, so as to neither cause the diaphragm 2 to fail to turn over nor cause the diaphragm 2 to be torn.

[0057] In one illustrative embodiment, the top wall of the first chamber 14 is provided with a gas outlet (not shown in the drawings). That is, the gas outlet is provided on the top plate 11 and communicates with the first chamber 14. The gas outlet is connected to a negative pressure source, which can be a vacuum pump or a fan. When the negative pressure source is started, the gas in the first chamber 14 is drawn out of the gas outlet.

[0058] The tank 1 is further provided with a sewage flow channel 16 for sucking the dirt into the first chamber 14. The sewage flow channel 16 extends from the bottom plate 12 into the first chamber 14 through the second chamber 15, and the sewage flow channel 16 is provided with a dirt inlet 161 for the dirt near the end of the sewage flow channel 16 close to the bottom plate 12. The end of the sewage flow channel 16 extending into the first chamber 14 is provided with a dirt outlet 163. When the negative pressure source is started, a negative pressure is formed in the first chamber 14, and the mixture of the dirt and the gas enters the sewage flow channel 16 from the dirt inlet 161, and after the gas-liquid separation in the sewage flow channel 16, the dirt in the sewage flow channel 16 is discharged into the first chamber 14 from the dirt outlet 163.

[0059] The sewage flow channel 16 includes a straight section 166 and a bent section 167. The straight section 166 is arranged in the side plate 13 of the tank 1 and extends along the side plate 13 from the end of the side plate 13 close to the bottom plate 12 to the end of the side plate 13 close to the top plate 11. The straight section 166 extends through the second chamber 15 and does not communicate with the second chamber 15. The dirt inlet 161 is arranged on the end of the straight section 166 close to the bottom plate 12.

[0060] The bent section 167 is arranged in the first chamber 14 and close to the top plate 11, and a part of the bent section 167 abuts against the top wall of the first chamber 14. One end of the bent section 167 communicates with the end of the straight section 166 close to the top plate 11. The bent section 167 is a curved channel. The dirt outlet 163 is arranged at the end of the bent section 167 not connected to the straight section 166. After the mixture of the dirt and the gas is input into the bent section 167 from the straight section 166, the gas-liquid separation occurs when the mixture flows through the bent section 167, and then the mixture is discharged into the first chamber 14 from the dirt outlet 163.

[0061] The bending section 167 comprises a first section 164 and a second section 165. The first section 164 is arranged in the first chamber 14, and one end of the first section 164 is connected to one end of the straight section 166 close to the top plate 11. The second section 165 extends along the top wall of the first chamber 14. The first section 164 can be arranged to extend along the top plate 11 towards the side of the first chamber 14 away from the straight section 166. One end of the second section 165 is connected to the end of the first section 164 away from the straight section 166, and the second section 165 extends from the end of the first section 164 away from the straight section 166 towards the bottom plate 12. The drain 163 is arranged at the end of the second section 165 away from the first section 164, and faces the bottom plate 12. The first section 164 and the second section 165 can be bent by 90°. After the dirt enters the second section 165 from the first section 164, the dirt needs to be turned by 90°. Due to the inertia, the dirt is thrown against the inner surface of the bending section 167, and the dirt is separated from the gas carrying the dirt, so that the gas-liquid separation effect is good.

[0062] After the first chamber 14 is filled with the dirt, when the water tank 100 is vertically placed, the liquid level of the dirt needs to reach the height of the highest part of the sewage flow channel 16 to flow out of the first chamber 14 through the sewage flow channel 16. In the water tank 100, since a part of the sewage flow channel 16 abuts against the top wall of the first chamber 14, i.e., the first section 163 abuts against the top wall of the first chamber 14, the liquid level of the dirt needs to reach the position close to the top wall of the first chamber 14 to flow out of the first chamber 14 through the sewage flow channel 16, otherwise, even if the liquid level of the dirt exceeds the drain 163, the dirt enters the drain 163, and the dirt is difficult to flow out of the first chamber 14 through the sewage flow channel 16. Since the liquid level of the dirt needs to reach the position close to the top wall of the first chamber 14 to flow out of the first chamber 14 through the sewage flow channel 16, at this time, the first chamber 14 is almost filled with the dirt, so that the effective volume of the first chamber 14 is large.

[0063] In an exemplary embodiment, an anti-fouling coating can also be arranged on the surface of the diaphragm 2. The anti-fouling coating can be made of a material with hydrophobic properties, such as polyolefin, polycarbonate, polyamide, polyacrylonitrile, polyester, fluorine-free acrylate, and molten paraffin. A material with oleophobic properties can also be selected, such as polytetrafluoroethylene. Alternatively, a material with both hydrophobic and oleophobic properties can be selected, such as polytetrafluoroethylene. The anti-fouling coating is not conducive to the adsorption of dirt on the surface of the diaphragm 2, improves the dirt resistance of the diaphragm 2, and reduces the cleaning cost of the diaphragm 2.

[0064] A surface cleaning device in the embodiment, such as Figure 4As shown, the surface cleaning device is provided with the water tank 100 as described in any of the above exemplary embodiments. The surface cleaning device further comprises a water pump (not shown in the figure), and the water inlet of the water pump is connected with the water outlet of the water tank 100. The cleaning liquid stored in the second chamber 15 is sprayed through the water spraying port (not shown in the figure) provided on the water pump.

[0065] In one exemplary embodiment, as shown in Figure 4 The surface cleaning device further comprises a body 200. The water tank 100 is arranged on the front side of the body 200, so that when the surface cleaning device is used, the water tank 100 faces upward, so as to facilitate the observation of the water level of the dirt in the first chamber 14 and the clean water in the second chamber 15 inside the water tank 100.

[0066] As shown in Figure 2 The first section 164 of the sewage flow channel 16 extends away from the body 200, i.e. extends forward. When the surface cleaning device is working, the upper end of the surface cleaning device is inclined backward at a certain angle, so that the dirt contained in the first chamber 14 is not easy to enter from the sewage outlet 163. The effective volume of the sewage tank is effectively increased, and the cleaning effect of the surface cleaning device is improved.

[0067] The above description is only the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made under the concept of the present application, or direct / indirect application in other related technical fields, using the content of the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A water tank for a surface cleaning apparatus, characterized in that, include: The enclosure has an internal cavity; A diaphragm, constructed in the shape of a bag, is disposed within the inner cavity and divides the inner cavity into a first chamber located above the diaphragm and a second chamber located below the diaphragm. The first chamber is used to contain dirt, and the second chamber is used to contain cleaning liquid. A one-way valve, with its two ends connected to the inside and outside of the second chamber respectively, allows only the fluid flowing into the second chamber to pass through; The second chamber is provided with an outlet for connecting an external water pump; The box body is also provided with a sewage channel for sucking waste into the first chamber. The sewage channel extends from the bottom plate of the box body through the second chamber into the first chamber. A sewage outlet is provided at the end of the sewage channel that extends into the first chamber. At least a portion of the sewage channel abuts against the top wall of the first chamber.

2. The water tank according to claim 1, characterized in that The one-way valve is configured to open when the pressure in the second chamber is negative and higher than a set first pressure threshold. The first pressure threshold is set based on the pressure in the second chamber when the diaphragm is torn or undergoes irreversible deformation.

3. The water tank according to claim 1 or 2, characterized in that The one-way valve is configured to open when the pressure in the second chamber is negative and lower than a set second pressure threshold. The second pressure threshold is the pressure set within the second chamber when the diaphragm flips from arching toward the first chamber to arching toward the second chamber.

4. The water tank according to claim 1, characterized in that The opening pressure of the one-way valve is 0.2 kPa to 3 kPa.

5. The water tank according to claim 1, characterized in that The one-way valve is located on the side wall of the second chamber.

6. The water tank according to claim 1, characterized in that The one-way valve is either a duckbill air intake valve or a spring-loaded one-way valve.

7. The water tank according to claim 1, characterized in that The sewage channel includes a first section extending along the top wall and a second section connected at one end to the first section; The sewage outlet is located at the other end of the second section, and the first and second sections are bent at 90°.

8. A surface cleaning device characterized by, It includes a water tank as described in any one of claims 1 to 7 and a water pump connected to the outlet.

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