CN114983288B

CN114983288B - Water tank and floor washing machine

Info

Publication number: CN114983288B
Application number: CN202210551469.9A
Authority: CN
Inventors: 刘志刚; 曹秀超; 倪梯闵; 王琪
Original assignee: Midea Group Co Ltd; Jiangsu Midea Cleaning Appliances Co Ltd
Current assignee: Midea Group Co Ltd; Jiangsu Midea Cleaning Appliances Co Ltd
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2023-07-14
Anticipated expiration: 2042-05-18
Also published as: CN114983288A

Abstract

The embodiment of the invention provides a water tank and a floor washing machine. The box body is provided with a cavity, an air inlet and an air outlet, and an air flow channel is formed between the air inlet and the air outlet; the float is floatably positioned in the cavity; the sound producing device is arranged on the floater to float up and down along with the floater, and in a state that the floater is positioned at a preset height, the sound producing device stretches into the air flow channel so that the air flow passes through the sound producing device and produces a sound. In the embodiment of the invention, the energy of the sound making device of the water tank is sourced from the airflow, no additional energy is needed to supply the sound making device, the sound making device is not contacted with the water stored in the water tank, the sound making device is not easy to be polluted and corroded, the risk of false triggering is reduced, and the reliability is improved.

Description

Water tank and floor washing machine

Technical Field

The invention relates to the technical field of cleaning electric appliances, in particular to a water tank and a floor cleaning machine.

Background

The floor washing machine is equipment for cleaning the floor, can save cleaning time and reduce the working intensity of a user.

The floor washing machine is provided with a sewage tank for storing sewage generated after the washing is completed. A floater which can rise and fall along with the sewage level is arranged in the sewage tank, and whether sewage is about to fill the sewage tank is judged by the height of the floater.

In the related art, an electric signal sensor is used for sensing the position of the floater so as to judge whether sewage in the sewage tank is full. The electric signal sensor is easily interfered by impurities in the sewage, and the false alarm problem occurs.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a water tank and a floor washer with a high reliability water level prompt mode.

In order to achieve the above purpose, the technical solution of the embodiments of the present application is implemented as follows:

the embodiment of the invention provides a water tank, which comprises:

the box body is provided with a cavity, an air inlet and an air outlet, and an air flow channel is formed between the air inlet and the air outlet;

a float floatably located within the cavity;

and the sound generating device is arranged on the floater to float up and down along with the floater, and stretches into the air flow channel in a state that the floater is positioned at a preset height so that air flow passes through the sound generating device and sounds.

In some embodiments, the sound producing device is a whistle, an air inlet and an air outlet are formed in the outer surface of the floater, an air channel is formed in the floater, the air channel is communicated with the air inlet and the air outlet, the whistle is arranged in the air channel, the air inlet is communicated with the air inlet when the floater is located at a preset height, and the air outlet is communicated with the air outlet, so that air flows through the whistle.

In some embodiments, in a state in which the float is located at the preset height, a projection of the air inlet along the air flow direction at the air inlet is located within a range of the air inlet

In some embodiments, in a state that the float is located at the preset height, a projection of the air outlet along the air flow direction at the air outlet position is located in a range of the air outlet.

In some embodiments, the air inlet is disposed on a side wall of the cavity, and the air outlet is disposed on a top wall of the cavity; the air inlet is positioned at the side surface of the floater, the air outlet is positioned at the top surface of the floater,

when the floater floats to a preset height, the air inlet is aligned with the air inlet, and the air outlet is aligned with the air outlet.

In some embodiments, the vent channel includes a first section extending transversely of the float and a second section extending longitudinally of the float, the first section being in communication with the air inlet and the second section being in communication with the air outlet, the air whistle being located in the second section.

In some embodiments, one of the inner wall of the cavity and the float is provided with a positioning groove, the other one is provided with a positioning protrusion, the positioning groove and the positioning protrusion both extend along the floating direction of the float, and the positioning protrusion is embedded in the positioning groove.

In some embodiments, the projection of the air outlet along the float floating direction of the float is located within the range of the float top surface.

In some embodiments, the preset height is a height corresponding to an upper level limit of the water tank.

The embodiment of the invention also provides a floor washing machine, which comprises:

the shell is provided with an inlet, an outlet and a negative pressure channel, and the negative pressure channel is communicated with the inlet and the outlet;

the water tank of any one of the foregoing embodiments, wherein the water tank is disposed in the casing, and the air outlet is communicated with the negative pressure channel.

In some embodiments, the cavity is located in an airflow path of the negative pressure channel, and a solid-liquid separation device is arranged in the negative pressure channel, so that separated sewage enters the cavity.

The water tank in the embodiment of the invention prompts a user of the water level position in the water tank in a mode that the sounding device sounds when the floater is located at a preset height. The energy of the sound generator for sounding is derived from the airflow. Compared with the prior art which adopts the modes of an electric signal sensor or a magnetic signal sensor and the like, on one hand, the method does not need to provide additional energy for a sound producing device, thereby reducing the power consumption and the manufacturing, using and maintaining costs; on the other hand, impurities contained in the water storage in the box in the cavity have little influence on the process of sounding by the sounding device under the action of the air flow, the sounding device is not contacted with the water storage in the box, the sounding device is not easy to pollute and corrode, the risk of false triggering is reduced, and the reliability is improved.

Drawings

FIG. 1 is a schematic view of a water tank in partial cutaway according to an embodiment of the present invention, wherein the dashed arrows indicate the direction of airflow;

FIG. 2 is a schematic partial cross-sectional view of a tank with a float below a predetermined height in accordance with another embodiment of the present invention, wherein the dashed arrows indicate the direction of flow of the air stream;

FIG. 3 is a schematic partial cross-sectional view of the embodiment of FIG. 2 with the float at a predetermined height, wherein the dashed arrows indicate the direction of airflow;

FIG. 4 is a schematic view, partly in section, of a water tank according to another embodiment of the invention, wherein the dashed arrows indicate the direction of flow of the air stream;

FIG. 5 is a schematic view of the position A-A of FIG. 2 in section in one embodiment;

FIG. 6 is a schematic view in cross-section of the position A-A of FIG. 2 in another embodiment;

fig. 7 is a schematic view showing a water tank in a cross section, wherein a dotted arrow is a schematic view showing a flow direction of an air stream, and a solid arrow is a schematic view showing a flow direction of sewage.

Description of the reference numerals

A case 10; a cavity 10a; an air inlet 10b; an air outlet 10c; an air flow passage 10d; a first subchamber 10e; a second subchamber 10f; 10g of water inlet; a limit projection 11; positioning projections 12; a partition plate 13; a float 20; an air inlet 20a; an air outlet 20b; a ventilation channel 21; a first end 211; a second section 212; a positioning groove 22; a sound producing device 30; in-tank water storage 40

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and technical features in the embodiments may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the gist of the present application and should not be construed as undue limitation to the present application.

In the description of the present application, the terms "upper," "lower," "top," "bottom," "transverse," "longitudinal" or positional relationships are based on the orientation or positional relationships shown in fig. 1, and it should be understood that these orientation terms are merely for convenience of description of the present application and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

An embodiment of the present invention provides a water tank, referring to fig. 1 to 4, which includes a tank body 10, a float 20, and a sound emitting device.

The box 10 is provided with a cavity 10a, an air inlet 10b and an air outlet 10c, and an air flow channel 10d is formed between the air inlet 10b and the air outlet 10c. The air flow enters the air flow channel 10d through the air inlet 10b and flows out of the air outlet 10c.

Float 20 is floatably located within cavity 10 a. The float 20 floats in an in-tank water reservoir 40 stored in the cavity 10 a. As the tank water storage 40 increases or decreases, the position of the float 20 in the up-down direction within the cavity 10a increases or decreases.

The specific structure and materials of the float 20 are not limited, and it is sufficient that the density of the float 20 is less than that of water. For example, the float 20 is made of foam.

The sounding device is provided on the float 20 to float up and down following the float 20 so that the position of the sounding device can be lifted up and down.

In a state where the float 20 is located at a preset height, the water level of the water storage 40 in the tank in the cavity 10a reaches a preset alarm water level. At this time, the sound generating device extends into the air flow channel 10d, so that the air flow passes through the sound generating device and sounds, and the user is reminded to stop water injection into the cavity 10a in time by making the sounds.

It will be appreciated that the predetermined height is provided to prevent overflow of the in-tank water storage 40 in the cavity 10a in a state where the in-tank water storage 40 in the cavity 10a is continuously increased.

It will be appreciated that when the float 20 is at a predetermined height, the volume of the in-tank reservoir 40 within the cavity 10a is less than the upper limit of the reservoir volume within the cavity 10a to increase safety redundancy, allowing the user some reaction time to stop filling or draining water.

It will be appreciated that the bottom edges of both the air inlet 20a and the air outlet 20b are always above the level of the in-tank water reservoir 40 within the cavity 10a at maximum capacity. To prevent the in-tank water storage 40 from directly overflowing from the air inlet 20a and the air outlet 20 b.

The water tank in the embodiment of the present invention prompts the user that the in-tank water storage 40 in the water tank is full or about to be full by sounding a sound by means of the float 20 in a state of being at a preset height. The energy of the sound generator for sounding is derived from the airflow. Compared with the prior art which adopts the modes of an electric signal sensor or a magnetic signal sensor and the like, on one hand, the method does not need to provide additional energy for a sound producing device, thereby reducing the power consumption and the manufacturing, using and maintaining costs; on the other hand, impurities contained in the water storage 40 in the tank in the cavity 10a have little influence on the process of sounding by the sounding device under the action of air flow, the sounding device is not contacted with the water storage 40 in the tank, the pollution and the corrosion are not easy to happen, the risk of false triggering is reduced, and the reliability is improved.

It will be appreciated that there is a gap between the float 20 and the inner wall of the cavity 10a to reduce the resistance experienced by the float 20 during flotation to reduce the reaction delay between the tank reservoir 40 reaching the capacity limit and the float 20 reaching the preset height.

The specific structure of the sound emitting device is not limited, and the sound emitting device is based on the principle that air vibrates in the process of passing through the sound emitting device to excite sound. For example, the sound emitting device is a whistle.

It should be noted that the specific structure and sounding principle of the whistle are widely used in the related art, and are not described herein.

As can be appreciated, referring to fig. 1 to 4, the sound emitting device is located near the top end of the float 20, so that the sound emitting device is far away from the in-tank water storage 40, and the probability that the in-tank water storage 40 splashes to the sound emitting device and adversely affects the sound emitting effect of the sound emitting device is reduced.

It will be appreciated that the placement of the sound emitting device on the float 20 enables the sound emitting device to increase the volume of the water reservoir 40 in the tank of the cavity 10a as much as possible without producing a ringing.

In some embodiments, referring to fig. 2 to 4, the outer surface of the float 20 is provided with an air inlet 20a and an air outlet 20b, the float 20 is provided with a ventilation channel 21 therein, the ventilation channel 21 communicates with the air inlet 20a and the air outlet 20b, and a whistle is provided in the ventilation channel 21. In a state where the float 20 is located at a predetermined height, the air inlet 20a communicates with the air inlet 10b, and the air outlet 20b communicates with the air outlet 10c, so that the air flow passes through the sound emitting device. That is, the ventilation passage 21 becomes a part of the airflow passage 10d. On the one hand, the ventilation channel 21 plays a role in guiding the airflow so as to guide the airflow with more flow rate to pass through the sounding device, and improve the persistence and stability of the sounding process of the sounding device; on the other hand, the sound generating device is located inside the float 20, so that the influence on the outer dimension of the float 20 is reduced, the float 20 can be lifted to a position where the top surface of the float 20 is abutted against the top wall of the cavity 10a, and the capacity of the water storage 40 in the tank in the cavity 10a is improved when the sound generating device generates a sound.

It will be appreciated that in the case where the flow rate of the air flow into the sound emitting device is low, the sound emitting device does not sound or the volume of the sound is hard to be perceived by the user. Therefore, by optimizing the positions of the air inlet 20a and the air outlet 20b on the float 20, the volume of the sound generated by the sound generating device in a state where the float 20 is located at a preset height is increased.

For example, referring to fig. 2 to 4, in a state where the float 20 is located at a predetermined height, a projection of the air inlet 20a along the air flow direction at the position of the air inlet 10b is located within the range of the air inlet 10 b. So that the air flow entering from the air inlet 20a can enter into the air inlet 10b as much as possible, and more air flow passes through the sound emitting device, and the sound emitted by the sound emitting device in the state that the float 20 is positioned at the preset height is improved.

As another example, referring to fig. 2 to 4, in a state where the float 20 is located at a predetermined height, a projection of the air outlet 20b along the air flow direction at the position of the air outlet 10c is located within the range of the air outlet 10c. So that the air flow discharged from the air outlet 20b can be directly discharged through the air outlet 10c. The air flow discharged by the air outlet 20b is prevented from directly striking the inner wall corresponding to the cavity 10a, on one hand, the probability of the float 20 moving in the cavity 10a caused by the reverse thrust generated by the air flow striking is reduced, the stability of the float 20 in the cavity 10a is improved, and the air flow is facilitated to stably pass through the sound generating device; on the other hand, abnormal sound generated by the air flow striking the inner wall corresponding to the cavity 10a is reduced, and the user experience is improved.

In some embodiments, the air inlet 10b is disposed at the top wall of the cavity 10a to reduce the likelihood of the in-tank water reservoir 40 overflowing from the cavity 10a through the air inlet 10 b.

In some embodiments, the air outlet 10c is disposed on the top wall of the cavity 10a to reduce the possibility of the water in the tank 40 overflowing from the cavity 10a through the air outlet 10c.

It will be appreciated that the air inlet 10b is adapted to the position of the air inlet 20a and the air outlet 10c is adapted to the position of the air outlet 20 b.

For example, referring to fig. 2 to 4, the air inlet 10b is disposed on a side wall of the cavity 10a, and the air outlet 10c is disposed on a top wall of the cavity 10 a. The air inlet 20a is located at the side of the float 20. The air inlet 20a floats up and down with the float 20 to change the relative height between the air inlet 10b and the air inlet 20 a. The air outlet 20b is located at the top surface of the float 20. So that the air outlet 20b is always directed toward the air outlet 10c, so that the air flow flowing out of the air outlet 20b can be discharged through the air outlet 10c in a state where the float 20 is higher than a preset height.

When the float 20 floats up to a predetermined height, the air inlet 20a is aligned with the air inlet 10b, and the air outlet 20b is aligned with the air outlet 10c.

In some embodiments, the air inlet 10b is sized larger than the air inlet 20a so that in the event that the float 20 passes over a predetermined height and continues to rise, air flow can still enter the air inlet 20a through the air inlet 10b, enabling the sounding device 30 to sound a sound for a long period of time to alert the user.

In some embodiments, in a state where the float 20 is lifted to a position where the top surface of the float 20 is abutted against the top wall of the cavity 10a, the top edge of the air inlet 10b is higher than the top edge of the air inlet 20a, so that in this state, even if the water level of the water storage 40 in the tank continues to rise, air flow can still enter the air inlet 20a through the air inlet 10b, so that the sound emitting device 30 is always in a sound state, thereby continuously reminding the user.

It will be appreciated that the configuration of the ventilation channel 21 is adapted to the position of the air inlet 20a and the air outlet 20 b.

For example, referring to fig. 2, the vent passage 21 includes a first section 211 extending in the lateral direction of the float 20 and a second section 212 extending in the longitudinal direction of the float 20, the first section 211 communicating with the air inlet 20a and the second section 212 communicating with the air outlet 20 b. To achieve the purpose that the ventilation channel 21 communicates between the air inlet 20a located at the side of the float 20 and the air outlet 20b located at the top surface of the float 20.

In some embodiments, referring to fig. 2, a wind sentry is located in the second section 212. After the air flow flows from the first section 211 to the second section 212, the flowing direction of the air flow is changed, so that the flow speed of the air flow is reduced, the air flow is prevented from impacting the air whistle at a high speed, and the air whistle can be stably located in the ventilation channel 21.

It will be appreciated that the internal wall of the cavity 10a is configured to prevent the float 20 from tipping over during flotation.

In some embodiments, the dimension of the inner wall of the cavity 10a in the transverse direction is smaller than the dimension of the float 20 in the longitudinal direction. So that the float 20 can be abutted against the inner wall of the cavity 10a when the float 20 tilts, thereby preventing the occurrence of the condition that the sound generating device is immersed in the water storage 40 in the tank due to the overturning of the float 20.

It will be appreciated that the cooperation between the inner wall of the cavity 10a and the float 20 can inhibit the rotation of the float 20, so as to avoid the dislocation between the air inlet 10b and the air inlet 20a when the float 20 is located at a predetermined height.

For example, referring to fig. 5, one of the inner wall of the cavity 10a and the float 20 is provided with a positioning groove 22, the other is provided with a positioning projection 12, both the positioning groove 22 and the positioning projection 12 extend in the longitudinal direction, and the positioning projection 12 is embedded in the positioning groove 22. The positioning protrusion 12 and the inner wall of the positioning groove 22 are abutted to inhibit the rotation of the floater 20 relative to the inner wall of the cavity 10a, so that the projections of the air inlet 20a and the air inlet 10b along the longitudinal direction always keep at least partially overlapped.

As another example, referring to fig. 6, the inner wall of the cavity 10a and the float 20 are rectangular in cross-section in the transverse direction to inhibit rotation of the float 20 relative to the inner wall of the cavity 10a, so that the projections of the air inlet 20a and the air inlet 10b in the longitudinal direction always remain at least partially overlapped.

In some embodiments, the inner wall of the cavity 10a and the float 20 are circular in cross section along the transverse direction, so that the airflow can be smoothly turned when flowing through the gap between the inner wall of the cavity 10a and the float 20, noise generated in the flowing process of the airflow is reduced, and user experience is improved.

In some embodiments, referring to fig. 4, a side of the top wall of the cavity 10a facing the float 20 is provided with a limiting protrusion 11, and the limiting protrusion 11 is made of an elastic material. The top surface of the float 20 abuts against the limit projection 11, i.e., the float 20 floats up to the highest position. The limiting protrusion 11 can absorb a part of acting force applied to the top wall of the cavity 10a by the float 20 under the buoyancy action of the water storage 40 in the tank through elastic deformation, so that the probability of damage caused by continuous impact of the float 20 and the top wall of the cavity 10a in the daily use process is reduced.

It will be appreciated that adjusting the size of the limit projection 11 in the longitudinal direction to adjust the highest position to which the float 20 can float avoids adjusting the wall thickness of the top wall of the cavity 10a, which is beneficial to reducing the wall thickness and the mass of the tank 10.

It is understood that the structure of the case 10 can limit the floating variation range of the float 20 in the up-down direction, so as to prevent the air inlet 20a from being unable to communicate with the air inlet 10b, the air outlet 20b from communicating with the air outlet 10c correspondingly due to the deviation of the position of the float 20.

For example, referring to fig. 1 to 4, the projection of the air outlet 10c along the floating direction of the float 20 is located within the range of the top surface of the float 20. The float 20 is limited by the inner wall of the cavity 10a corresponding to the edge of the air outlet 10c. After the top surface of the float 20 abuts against the inner wall of the cavity 10a corresponding to the edge of the air outlet 10c, the float 20 floats up to the highest position, and even if the water level continues to rise, the position of the float 20 in the up-down direction remains unchanged, so that the sounding device 30 can continuously sound.

As another example, referring to fig. 7, the case 10 includes a partition 13 to partition the cavity 10a into a first subchamber 10e and a second subchamber 10f, and the float 20 is positioned in the first subchamber 10 e. The bottom of the first subchamber 10e communicates with the bottom of the second subchamber 10f such that the liquid level of the first subchamber 10e is equal to the liquid level of the second subchamber 10 f. The movement direction of the float 20 during the floating process is guided by the limiting action of the partition 13 and the inner wall of the first subchamber 10e, preventing the float 20 from overturning during the floating process.

The distance between the bottom of the partition 13 and the bottom wall of the cavity 10a is smaller than the longitudinal dimension of the float 20, so as to prevent the float 20 from falling out of the first subchamber 10e and entering the second subchamber 10f, thereby causing the generation device to lose the alarm prompting function, and the float 20 always moves in the first subchamber 10 e.

It is understood that the preset height is a height corresponding to the upper limit of the liquid level of the water tank. That is, when the float 20 is in a state of a preset height, the liquid level in the cavity 10a and the highest height within a safe range are reached, the user is prompted to stop filling water into the cavity 10a immediately by the sound emitting sound of the sound emitting device 30.

The embodiment of the invention also provides a floor washing machine, which comprises a shell and the water tank of any one of the previous embodiments. The casing is provided with an inlet, an outlet and a negative pressure channel, the negative pressure channel is communicated with the inlet and the outlet, the water tank is arranged in the casing, and the air outlet 10c is communicated with the negative pressure channel. The negative pressure in the negative pressure passage is used to generate an air flow from the air inlet 10b to the air outlet 10c in the air flow passage 10d.

In some embodiments, the airflow channel 10d is located in the airflow path of the negative pressure channel. That is, the air flow passage 10d is a part of the negative pressure passage.

The floor scrubber includes a negative pressure generating device for generating a negative pressure in the negative pressure passage, and a specific manner in which the negative pressure generating device generates the negative pressure is not limited.

For example, the negative pressure generating device comprises a motor and an impeller, wherein the motor is in driving connection with the impeller to drive the impeller to rotate, and the impeller is positioned in the negative pressure channel. By rotation of the impeller, air flow is generated in the negative pressure channel, and negative pressure is generated.

For another example, a vacuum pump is arranged in the negative pressure channel, and the vacuum pump continuously sucks air in the negative pressure channel to generate negative pressure.

It will be appreciated that the location of the negative pressure generating means in the negative pressure passage is downstream of the air outlet 10c in the direction of airflow.

The water tank is used for storing sewage in the floor scrubber. The negative pressure generated by the negative pressure generating means serves on the one hand to suck the sewage generated by the scrubber during the cleaning process and on the other hand to generate an air flow in the air flow channel 10d. Therefore, no additional negative pressure generating device is needed to generate air flow in the air flow channel 10d, the power consumption is reduced, and the number of parts in the floor washing machine is reduced.

In some embodiments, the inlet is located on the bottom surface of the housing and the cavity 10a is located in the airflow path of the negative pressure channel. So that dirt and sewage on the ground enters the cavity 10a through the inlet under the action of negative pressure, thereby achieving the purpose of sucking the dirt and sewage by the floor scrubber.

It will be appreciated that the inlet is in one way communication with the cavity 10a to prevent the flow of sewage from the cavity 10a back out of the scrubber. The specific manner of achieving the unidirectional communication is not limited. For example, a check valve is provided on the sewage flow path between the inlet and the cavity 10 a.

Referring to fig. 7, the tank 10 is provided with a water inlet 10g, the water inlet 10g is communicated with the cavity 10a, and the water inlet 10g is positioned at the bottom of the cavity 10a, so as to reduce water splash caused by sewage entering the cavity 10a, and reduce the probability of the sewage splashing outside the air inlet 10b and the air inlet 20a to enter the ventilation channel 21. The air outlet 10c is positioned at the top of the cavity 10a to reduce the probability of sewage splashing outside into the negative pressure channel. The air flows in the air flow passage 10d and the cavity 10a are discharged through the air outlet 10c.

In some embodiments, the air outlet 10c is provided with a filter screen, so that on one hand, sewage excited by vibration and position change of the floor scrubber can be shielded, the probability that water excited in the cavity 10a enters the negative pressure channel is reduced, and on the other hand, the probability that solid impurities enter the negative pressure generating device through the air outlet 10c is reduced.

A solid-liquid separation device is arranged in the negative pressure channel so that the separated sewage enters the cavity 10 a. Thereby reducing the probability of clogging due to the entry of the fixing substance into the cavity 10a and reducing the probability of the solid dirt sticking to the float 20 to affect the float 20 to float up and down.

The specific form of the solid-liquid separation device is not limited, for example, a filter screen or the like.

The various embodiments/implementations provided herein may be combined with one another without conflict.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A water tank, comprising:

the box body (10), the box body (10) is provided with a cavity (10 a), an air inlet (10 b) and an air outlet (10 c), and an air flow channel (10 d) is formed between the air inlet (10 b) and the air outlet (10 c); the air inlet (10 b) is arranged on the side wall of the cavity (10 a), and the air outlet (10 c) is arranged on the top wall of the cavity (10 a);

-a float (20), said float (20) being floatably located within said cavity (10 a);

the sound producing device (30) is arranged on the floater (20) to float up and down along with the floater (20), the sound producing device (30) stretches into the airflow channel (10 d) in a state that the floater (20) is located at a preset height, so that airflow passes through the sound producing device (30) and sounds, the sound producing device (30) is a whistle, an air inlet (20 a) and an air outlet (20 b) are arranged on the outer surface of the floater (20), an air ventilation channel (21) is arranged in the floater (20), the air ventilation channel (21) is communicated with the air inlet (20 a) and the air outlet (20 b), the air inlet (20 a) is communicated with the air inlet (10 b) in a state that the floater (20) is located at the preset height, the air outlet (20 b) is communicated with the air outlet (10 c) so that the airflow passes through the air whistle, the air inlet (20 a) is located on the side surface of the floater (20 b), and the air outlet (20 b) is located on the top surface of the floater (20).

When the floater (20) floats to a preset height, the air inlet (20 a) is aligned with the air inlet (10 b), and the air outlet (20 b) is aligned with the air outlet (10 c).

2. The water tank according to claim 1, characterized in that, in the state in which the float (20) is located at the preset height, the projection of the air inlet (20 a) in the direction of the air flow at the position of the air inlet (10 b) is located within the range of the air inlet (10 b).

3. The water tank according to claim 1, characterized in that, in a state in which the float (20) is located at the preset height, a projection of the air outlet (20 b) in the direction of the air flow at the position of the air outlet (10 c) is located within the range of the air outlet (10 c).

4. The water tank according to claim 1, characterized in that the vent channel (21) comprises a first section (211) extending in a transverse direction of the float (20) and a second section (212) extending in a longitudinal direction of the float (20), the first section (211) being in communication with the air inlet (20 a) and the second section (212) being in communication with the air outlet (20 b), the air whistle being located in the second section (212).

5. The water tank according to claim 1, wherein one of the inner wall of the cavity (10 a) and the float (20) is provided with a positioning groove (22), the other is provided with a positioning projection (12), both the positioning groove (22) and the positioning projection (12) extend in the longitudinal direction, and the positioning projection (12) is embedded in the positioning groove (22).

6. The water tank according to claim 1, characterized in that the projection of the air outlet (10 c) in the floating direction of the float (20) is located in the range of the top surface of the float (20).

7. The water tank of claim 1, wherein the preset height is a height corresponding to an upper level limit of the water tank.

8. A floor scrubber, comprising:

the water tank of any one of claims 1-7, which is provided in the housing, the air outlet (10 c) being in communication with the negative pressure channel.