CN114983288A

CN114983288A - Water tank and floor cleaning machine

Info

Publication number: CN114983288A
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: 2022-09-02
Anticipated expiration: 2042-05-18
Also published as: CN114983288B

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 floater can be floatably positioned in the cavity; the sounding device is arranged on the floater to float up and down along with the floater, and extends into the airflow channel when the floater is at a preset height, so that airflow passes through the sounding device and sounds. In the embodiment of the invention, the energy for the sounding device of the water tank to send out the sounding comes from the flowing of the airflow, no extra energy is needed to supply the sounding device, the sounding device is not in contact with the water stored in the tank, the sounding device is not easy to be polluted or corroded, the risk of false triggering is reduced, and the reliability is improved.

Description

Water tank and floor cleaning machine

Technical Field

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

Background

The floor washing machine is equipment for washing the ground, can save the cleaning time, reduces user's working strength.

The floor washing machine is internally provided with a sewage tank for storing sewage generated after the washing is finished. A floater capable of rising and falling along with the sewage liquid level is arranged in the sewage tank, and whether the sewage tank is full of sewage is judged according to the height of the floater.

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

Disclosure of Invention

In view of this, the present application is directed to a water tank and a floor washing machine with a highly reliable water level indication method.

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

an embodiment of the present invention provides a water tank, including:

the air conditioner comprises a box body, a fan and a fan, wherein 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 positioned within the cavity;

and the sounding device is arranged on the floater to float up and down along with the floater, and extends into the airflow channel when the floater is at a preset height, so that airflow passes through the sounding device and buzzes.

In some embodiments, the sounding device is a whistle, an air inlet and an air outlet are arranged on an outer surface of the float, a ventilation channel is arranged in the float and is communicated with the air inlet and the air outlet, the whistle is arranged in the ventilation channel, the air inlet is communicated with the air inlet and the air outlet is communicated with the air outlet when the float is at a preset height, so that the air flow passes through the whistle.

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

In some embodiments, in a state where the float is at the preset height, a projection of the air outlet along an airflow direction at the air outlet position is located within a range of the air outlet.

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

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

In some embodiments, the vent passage comprises a first section extending in a transverse direction of the float and a second section extending in a longitudinal direction of the float, the first section communicating with the air inlet, the second section communicating with the air outlet, the 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, and the other is provided with a positioning projection, both of which extend in the floating direction of the float, and the positioning projection is fitted into the positioning groove.

In some embodiments, a projection of the vent in the direction of float of the float is located within the confines of the top surface of the float.

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

An embodiment of the present invention further provides a floor washing machine, including:

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;

in the water tank according to any of the preceding embodiments, 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.

In the water tank provided by the embodiment of the invention, the sounding device sends out a sounding mode to prompt a user of the water level position in the water tank when the floater is positioned at the preset height. The energy of the sound producing device to produce the beep is derived from the airflow. Compared with the mode of adopting an electric signal sensor or a magnetic signal sensor and the like in the related technology, on one hand, the sounding device is not required to be supplied with extra energy, so that the power consumption is reduced, and the manufacturing, using and maintaining costs are reduced; on the other hand, impurities contained in the water stored in the tank in the cavity have little influence on the sounding process of the sounding device under the action of the airflow, and the sounding device is not in contact with the water stored in the tank and is not easy to be stained and corroded, so that the risk of false triggering is reduced, and the reliability is improved.

Drawings

FIG. 1 is a schematic view of a water tank in a partially cut-away configuration according to an embodiment of the present invention, wherein the dotted arrows indicate the flowing direction of air flow;

FIG. 2 is a schematic view in partial cross-section 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;

FIG. 3 is a schematic view, partially in section, of the tank of the embodiment of FIG. 2 with the float at a predetermined height, and with the dashed arrows indicating the direction of flow;

FIG. 4 is a schematic view of a water tank in a partial cutaway in accordance with another embodiment of the present invention, wherein the dashed arrows indicate the direction of airflow;

FIG. 5 is a schematic view in section at location A-A in FIG. 2 in an embodiment;

FIG. 6 is a schematic view in section at the location A-A in FIG. 2 in another embodiment;

fig. 7 is a sectional view of the water tank according to an embodiment of the present invention, in which a dotted arrow indicates an airflow flowing direction and a solid arrow indicates a sewage inflow direction.

Description of the reference numerals

A case 10; a cavity 10 a; an air inlet 10 b; an air outlet 10 c; the airflow passage 10 d; a first sub-cavity 10 e; a second subchamber 10 f; a water inlet 10 g; a limiting bulge 11; a positioning boss 12; a partition plate 13; a float 20; an air inlet 20 a; an air outlet 20 b; a vent passage 21; a first end 211; a second section 212; a positioning groove 22; a sound producing device 30; water stored in the tank 40

Detailed Description

It should be noted that the embodiments and technical features of the embodiments in the present application may be combined with each other without conflict, and the detailed description in the detailed description should be understood as an explanation of the gist of the present application and should not be construed as an undue limitation to the present application.

In the description of the present application, the "up," "down," "top," "bottom," "lateral," "longitudinal" orientations or positional relationships are based on the orientations or positional relationships illustrated in FIG. 1, it being understood that these orientation terms are merely used to facilitate the description of the present application and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the present application.

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

The box 10 has 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 10 c. The airflow enters the airflow channel 10d through the air inlet 10b and then flows out through the air outlet 10 c.

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

The specific structure and material of the float 20 is not limited, and the requirement that the density of the float 20 is less than that of water can be met. 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 elevated up and down.

In a state where the float 20 is at a preset height, the water level of the tank-inside stored water 40 in the cavity 10a reaches a preset alarm water level. At this time, the sounding device extends into the airflow channel 10d, so that the airflow passes through the sounding device and sounds, and the sounding sound reminds the user to stop filling water into the cavity 10a in time.

It is understood that the predetermined height is set to prevent the inside water 40 in the cavity 10a from being overflowed due to an excessive amount of the inside water 40 in the cavity 10a in a state where the inside water 40 in the cavity 10a is continuously increased.

It will be appreciated that the volume of the tank water storage 40 in the cavity 10a is less than the upper limit of the water storage volume in the cavity 10a when the float 20 is at the predetermined height, to increase safety redundancy and allow the user a certain response time to stop filling or draining.

It will be appreciated that the bottom edges of both the air inlet 20a and the air outlet 20b are always above the water level of the tank water storage 40 in 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 informs a user that the water stored in the tank 40 in the water tank is full or is about to be full by sounding the sounding device in a state where the float 20 is at a preset height. The energy of the sound producing device to produce the beep is derived from the airflow. Compared with the mode of adopting an electric signal sensor or a magnetic signal sensor and the like in the related technology, on one hand, extra energy is not needed to supply the sound generating device, so that the power consumption is reduced, and the manufacturing, using and maintaining costs are reduced; on the other hand, the impurities contained in the tank water storage 40 in the cavity 10a have little influence on the sounding process of the sounding device under the action of the airflow, and the sounding device is not in contact with the tank water storage 40 and is not easy to be polluted and corroded, so that the risk of false triggering is reduced, and the reliability is improved.

It will be appreciated that there is a clearance 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 delay in the reaction between the stored water 40 reaching the capacity limit and the float 20 reaching the predetermined height within the tank.

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

It should be noted that the specific structure and the pronunciation principle of the whistle have been widely applied in the related art, and are not described herein.

It will be appreciated that with reference to fig. 1-4, the sound generator is located near the top of the float 20 so that the sound generator is located away from the tank water 40 to reduce the chance that the tank water 40 will splash against the sound generator and adversely affect the sound generation of the sound generator.

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

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 an air vent passage 21 therein, the air vent passage 21 communicates the air inlet 20a and the air outlet 20b, and a whistle is disposed in the air vent passage 21. In a state where the float 20 is 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 generating device. That is, the ventilation passage 21 becomes a part of the air flow passage 10 d. On one hand, the ventilation channel 21 plays a role in guiding the airflow so as to guide the airflow with more flow to pass through the sounding device, and the continuity and stability of the sounding process of the sounding device are improved; on the other hand, the sounding means is located inside the float 20, thereby reducing the influence on the outer contour dimension of the float 20, enabling the float 20 to rise to a position where the top surface of the float 20 abuts against the top wall of the cavity 10a, which is advantageous for increasing the volume of the tank-inside water storage 40 in the cavity 10a when the sounding means is generated.

It will be appreciated that in the event that the flow rate of the airflow into the sound producing device is low, the sound producing device does not beep or the volume of the beep is difficult for the user to perceive. Therefore, the sound volume of the sounding device is increased by optimizing the positions of the air inlet 20a and the air outlet 20b on the float 20 in a state where the float 20 is at a preset height.

For example, referring to fig. 2 to 4, in a state where the float 20 is 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 a range of the air inlet 10 b. So that the air flow introduced from the air inlet 20a can be introduced into the air inlet 10b as much as possible, thereby allowing more air flow to pass through the sounding device, improving the sounding of the sounding device in a state where the float 20 is at a preset height.

For another example, referring to fig. 2 to 4, when the float 20 is at the predetermined height, the projection of the air outlet 20b along the airflow direction at the air outlet 10c is located within the range of the air outlet 10 c. So that the air current discharged from the air outlet 20b can be directly discharged through the air outlet 10 c. The air flow discharged from the air outlet 20b is prevented from directly impacting the inner wall corresponding to the cavity 10a, on one hand, the probability that the float 20 moves in the cavity 10a due to the reverse thrust generated by the impact of the air flow is reduced, the stability of the float 20 in the cavity 10a is improved, and the stable passing of the air flow through the sounding device is facilitated; on the other hand, abnormal sound generated when the airflow strikes the inner wall corresponding to the cavity 10a is reduced, and user experience is improved.

In some embodiments, the intake vent 10b is disposed in a top wall of the cavity 10a to reduce the likelihood that the water 40 in the tank will overflow the cavity 10a through the intake vent 10 b.

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

It is understood that the inlet 10b is adapted to the position of the inlet 20a, and the outlet 10c is adapted to the position of the outlet 20 b.

For example, referring to fig. 2 to 4, the inlet 10b is disposed on a side wall of the cavity 10a, and the 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 in the up-and-down direction 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 on the top surface of the float 20. So that the air outlet 20b always faces the air outlet 10c, so that the air flow flowing out from the air outlet 20b can be discharged through the air outlet 10c in a state where the float 20 is higher than the preset height.

When the float 20 floats 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 10 c.

In some embodiments, the air inlet 10b is larger than the air inlet 20a, so that in the event that the float 20 moves over a preset height and continues to rise, air flow can still enter the air inlet 20a through the air inlet 10b, so that the sound generating device 30 can beep to remind the user for a long time.

In some embodiments, in a state where the float 20 ascends to a position where the top surface of the float 20 abuts 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, the air flow can enter the air inlet 20a through the air inlet 10b, so that the sound-producing device 30 is always in a chirping state, thereby continuously alerting the user.

It will be appreciated that the configuration of the vent passage 21 is adapted to the positions 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. For the purpose of communicating the air inlet port 20a at the side of the float 20 and the air outlet port 20b at the top surface of the float 20 through the air vent passage 21.

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

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

In some embodiments, the inner wall of the cavity 10a has a dimension in the transverse direction that is smaller than the dimension of the float 20 in the longitudinal direction. So that the float 20 can abut against the inner wall of the cavity 10a when the float 20 is inclined, thereby preventing the sounding device from being submerged in the tank water 40 due to the float 20 being overturned.

It will be appreciated that the engagement between the inner wall of the cavity 10a and the float 20 inhibits rotation of the float 20 to prevent misalignment between the air inlet 10b and the air inlet 20a when the float 20 is 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 protrusion 12, the positioning groove 22 and the positioning protrusion 12 both extend in the longitudinal direction, and the positioning protrusion 12 is fitted into the positioning groove 22. The rotation of the float 20 relative to the inner wall of the cavity 10a is inhibited by the abutment between the positioning projection 12 and the inner wall of the positioning groove 22, so that the projections of the air inlet 20a and the air inlet 10b in the longitudinal direction always keep at least partial overlap.

For 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 air inlet 20a and the air inlet 10b always at least partially overlap in longitudinal projection.

In some embodiments, the inner wall of the cavity 10a and the float 20 are both circular in cross section in 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 by the airflow during the flowing process is reduced, and the user experience is improved.

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

It can be understood that, adjust spacing arch 11 along fore-and-aft size to adjust the highest position that float 20 can come up to, avoid adjusting through the wall thickness size of adjustment cavity 10a roof, be favorable to reducing wall thickness, alleviate box 10 quality.

It is understood that the case 10 is constructed to limit a floating variation range of the float 20 in the up-down direction, so as to prevent the air inlet 20a from being not communicated with the air inlet 10b, and the air outlet 20b from being communicated with the air outlet 10c due to a positional deviation 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 10 c. 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 to the highest position, and even if the water level continues to rise, the position of the float 20 in the vertical direction is kept unchanged, so that the sound-producing device 30 can continuously produce the sound.

For another example, referring to fig. 7, tank 10 includes a partition 13 to space cavity 10a to form a first subchamber 10e and a second subchamber 10f, with float 20 located in first subchamber 10 e. The bottom of the first sub-chamber 10e is in communication with the bottom of the second sub-chamber 10f such that the height of the liquid level in the first sub-chamber 10e is equal to the height of the liquid level in the second sub-chamber 10 f. The movement direction of the float 20 in the floating process is guided by the limit action of the partition plate 13 and the inner wall of the first sub-cavity 10e, and the float 20 is prevented from overturning in 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 sub-cavity 10e and entering the second sub-cavity 10f to cause the device to lose the whistling function, and the float 20 can move in the first sub-cavity 10e all the time.

It will be understood that the predetermined height is a height corresponding to the upper level limit of the tank. That is, when the liquid level in the cavity 10a reaches the maximum level within the safety range in the state where the float 20 is at the preset height, the user is prompted by the sound of the sounding device 30 that the water injection into the cavity 10a needs to be stopped immediately.

The embodiment of the invention also provides a floor washing machine which comprises a machine shell and the water tank in 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. By the negative pressure in the negative pressure channel, an air flow flowing from the air inlet 10b to the air outlet 10c is generated in the air flow channel 10 d.

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

The scrubber comprises a negative pressure generating device for enabling the negative pressure channel to generate negative pressure, and the specific mode of generating the negative pressure by the negative pressure generating device is not limited.

For example, the negative pressure generating device comprises a motor and an impeller, the motor is in driving connection with the impeller to drive the impeller to rotate, and the impeller is located in the negative pressure channel. Through the rotation of impeller, produce the air current in the negative pressure passageway, and then produce the negative pressure.

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

It is understood that the position of the negative pressure generating device in the negative pressure passage is located downstream of the air outlet 10c in the airflow flowing direction.

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

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

It will be appreciated that there is one way communication between the inlet and the cavity 10a to prevent the waste water in the cavity 10a from flowing back out of the scrubber. The specific manner of achieving the one-way 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 box body 10 is provided with a water inlet 10g, the water inlet 10g is communicated with the cavity 10a, and the water inlet 10g is located at the bottom of the cavity 10a, so as to reduce splash caused by sewage entering the cavity 10a and reduce the probability that the sewage splashes to enter the ventilation channel 21 through the air inlet 10b and the air inlet 20 a. The air outlet 10c is located at the top of the cavity 10a to reduce the probability of the sewage splashing into the negative pressure channel. The air flow in the air flow channel 10d and the cavity 10a both flow out through the air outlet 10 c.

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 scrubber can be shielded, the probability that water flow 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 fixed matter entering the cavity 10a and reducing the probability of solid contaminants adhering to the float 20 and affecting the upward and downward floating of the float 20.

The solid-liquid separation apparatus is not limited to a specific form, and may be, for example, a filter screen.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A water tank, comprising:

the air conditioner comprises a box body (10), wherein the box body (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 (10 c);

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

and the sounding device (30) is arranged on the floater (20) to float up and down along with the floater (20), and when the floater (20) is positioned at a preset height, the sounding device (30) extends into the airflow channel (10d) so that airflow passes through the sounding device (30) and sounds.

2. The water tank according to claim 1, wherein the sound generating device (30) is a whistle, the outer surface of the float (20) is provided with an air inlet (20a) and an air outlet (20b), an air vent channel (21) is provided in the float (20), the air vent channel (21) communicates the air inlet (20a) and the air outlet (20b), the whistle is provided in the air vent channel (21), the air inlet (20a) communicates with the air inlet (10b) and the air outlet (20b) communicates with the air outlet (10c) in a state that the float (20) is at a predetermined height, so that the air flow passes through the whistle.

3. The water tank as claimed in claim 2, wherein in a state where the float (20) is located at the preset height, a projection of the air inlet (20a) in an air flow direction at a position of the air inlet (10b) is located within a range of the air inlet (10 b).

4. The water tank according to claim 2, wherein a projection of the air outlet (20b) in the direction of the air flow at the position of the air outlet (10c) is located within the range of the air outlet (10c) in a state where the float (20) is located at the preset height.

5. The water tank according to claim 2, characterized in that the air inlet (10b) is arranged on a side wall of the cavity (10a) and the air outlet (10c) is arranged on a top wall of the cavity (10 a); the air inlet (20a) is located on the side of the float (20), the air outlet (20b) is located on the top surface of the float (20),

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

6. The water tank according to claim 2, wherein the vent passage (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) communicating with the air inlet (20a), the second section (212) communicating with the air outlet (20b), the whistle being located in the second section (212).

7. The tank according to claim 1, characterized in that one of the inner wall of the cavity (10a) and the float (20) is provided with a positioning slot (22) and the other with a positioning projection (12), the positioning slot (22) and the positioning projection (12) both extending in the longitudinal direction, the positioning projection (12) being embedded in the positioning slot (22).

8. The water tank as claimed in claim 1, wherein a projection of the air outlet (10c) in a floating direction of the float (20) is located within a range of a top surface of the float (20).

9. The water tank as claimed in claim 1, wherein the preset height is a height corresponding to an upper limit of a liquid level of the water tank.

10. A floor scrubber, comprising:

the water tank as claimed in any one of claims 1 to 9, which is provided in the cabinet, the air outlet (10c) being in communication with the negative pressure passage.