CN217510403U

CN217510403U - Surface cleaning apparatus with liquid level detection device

Info

Publication number: CN217510403U
Application number: CN202220587312.7U
Authority: CN
Inventors: 徐哲; 李永志; 唐成; 段飞
Original assignee: Beijing Shunzao Technology Co Ltd
Current assignee: Beijing Shunzao Technology Co Ltd
Priority date: 2022-03-15
Filing date: 2022-03-15
Publication date: 2022-09-30
Anticipated expiration: 2032-03-15

Abstract

The present disclosure provides a surface cleaning apparatus with a liquid level detection device, comprising: the cleaning liquid storage part comprises a closed inner cavity, and the inner cavity is formed by surrounding a top wall, a bottom wall and a side wall arranged between the top wall and the bottom wall; the liquid level detection device comprises a first detection component and a second detection component, the first detection component is arranged at the upper end part of the cleaning liquid storage part to detect the first liquid level, and the second detection component is arranged at the lower end part of the cleaning liquid storage part to detect the second liquid level; the first detection assembly comprises a contact detector and a non-contact detector, and the second detection assembly comprises a non-contact detector; at least one part of the contact detector is arranged at the upper end part of the cleaning liquid storage part and extends into the inner cavity of the cleaning liquid storage part; the non-contact detector of the first detection assembly and the non-contact detector of the second detection assembly are both arranged on the side wall of the cleaning liquid storage part.

Description

Surface cleaning apparatus with liquid level detection device

Technical Field

The present disclosure relates to the field of cleaning technology, and more particularly, to a surface cleaning apparatus having a liquid level detection device.

Background

Existing surface cleaning apparatus can be used to wet scrub clean hard floors or short pile carpets in general. Such surface cleaning apparatuses usually have one or more rolling brushes or cleaning discs made of a woollen material. Stubborn soils on the floor can be scrubbed by the addition of water or a water/cleaner mixture.

When the surface cleaning apparatus moves over the dirt, the dirt which has been wiped off by the roller brush and dissolved by the water or the water/detergent mixture is sucked up by the cleaning head arranged in the direction of movement of the roller brush, and in the technique of providing the cleaning disk, the cleaning head may not be provided and the dirt is directly adsorbed by the cleaning material on the cleaning disk.

However, tough soil is generally difficult to clean, and after the soil is scattered on the floor surface, water is evaporated to form hard-to-remove tough soil on the floor surface. Often, not all of this stubborn dirt is removed by the vacuuming operation during scrubbing, leaving some dirt on the floor, reducing the quality of the cleaning.

The cleaning effect of hot water is remarkably effective on hard floors. A reasonable and effective scheme is that the surface cleaning device is cleaned in a mode of heating water, the problems of cruising and water continuing of the surface cleaning device are considered, the energy loss of the surface cleaning device is reduced, and the energy loss is transferred to a water storage base station (base station device). Therefore, a water replenishing base station is arranged, a water storage tank is arranged on the base station, water in the water storage tank is heated, and the water is heated to a temperature suitable for cleaning stubborn stains and is kept. The surface cleaning equipment returns to the base station equipment, is in butt joint with the base station water tank through the water adding joint, achieves automatic water supplementing, and then continues to be cleaned by hot water. Or the cleaning action is finished, the surface cleaning equipment returns to the base station, and if the clean water tank has residual clean water, the residual clean water can be led back to the water storage tank of the base station equipment.

Therefore, a liquid level detecting device is provided in the surface cleaning apparatus to detect a liquid level of a cleaning liquid storage tank of the surface cleaning apparatus, thereby achieving a water replenishing operation of the surface cleaning apparatus.

The liquid level detection device in the prior art does not have a detection device suitable for hot water, and the full water detection device mostly adopts an electrode needle mode at present, and the electrode needle mode is adopted for detecting the hot water level for a long time, so that scale hidden danger can be generated.

In addition, even if normal-temperature water or water quality is too good, the potential danger of false alarm can be caused by only adopting an electrode needle mode to detect the water level.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the above technical problems, the present disclosure provides a surface cleaning apparatus having a liquid level detection device, including:

the cleaning liquid storage part is used for storing cleaning liquid and comprises a closed inner cavity, and the inner cavity is formed by surrounding a top wall and a bottom wall by a side wall arranged between the top wall and the bottom wall;

a cleaning base in fluid communication with the cleaning liquid reservoir to receive cleaning liquid provided by the cleaning liquid reservoir, the cleaning base being capable of wet cleaning a surface to be cleaned based on the cleaning liquid provided by the cleaning liquid reservoir;

a liquid level detection device including a first detection unit provided at an upper end portion of the cleaning liquid storage portion to detect a first liquid level (full liquid detection), and a second detection unit provided at a lower end portion of the cleaning liquid storage portion to detect a second liquid level (no liquid detection);

wherein the first detection assembly comprises a contact detector and a non-contact detector, and the second detection assembly comprises a non-contact detector;

at least one part of the contact detector is arranged at the upper end part of the cleaning liquid storage part and extends into the inner cavity of the cleaning liquid storage part;

the non-contact detector of the first detection assembly and the non-contact detector of the second detection assembly are both arranged on the side wall of the cleaning liquid storage part.

According to at least one embodiment of the present disclosure, the contact detector comprises an electrode probe and the non-contact detector comprises a magnetic signal detector.

In accordance with at least one embodiment of the present disclosure, the surface cleaning apparatus has a liquid level detection device, the first liquid level is a full liquid level and the second liquid level is a no liquid level.

A surface cleaning apparatus having a liquid level detection device according to at least one embodiment of the present disclosure, the liquid level detection device further comprising a third detection assembly comprising at least one non-contact detector, the third detection assembly being disposed between the first detection assembly and the second detection assembly to detect at least one intermediate liquid level between the first liquid level and the second liquid level.

The surface cleaning apparatus with a liquid level detection device according to at least one embodiment of the present disclosure further includes a signal processor that generates a first liquid level indicating signal based on the detection signal of the first detection assembly, and generates a second liquid level indicating signal based on the detection signal of the second detection assembly.

Wherein the first level indicating signal may be a full level indicating signal and the second level indicating signal may be a no liquid level indicating signal.

According to the surface cleaning apparatus with the liquid level detection device, the signal processor generates the first liquid level indication signal based on the detection signal of the contact detector of the first detection assembly and/or the detection signal of the non-contact detector of the first detection assembly.

According to at least one embodiment of the present disclosure, the signal processor generates at least one intermediate level indicating signal based on the detection signal of the third detection assembly.

According to the surface cleaning device with the liquid level detection device, at least one of the top wall, the bottom wall and the side wall is attached with the heat insulation material.

According to the surface cleaning device with the liquid level detection device of at least one embodiment of the disclosure, at least one of the top wall, the bottom wall and the side wall is formed into a heat insulation structure.

A surface cleaning apparatus having a liquid level detection device according to at least one embodiment of the present disclosure, the liquid level detection device further comprising at least one magnetic float, the non-contact detector generating a detection signal based on magnetic triggering of the non-contact detector by the at least one magnetic float.

The surface cleaning apparatus having a liquid level detection device according to at least one embodiment of the present disclosure further includes a float guide along which the magnetic float is movable in a vertical direction under buoyancy of liquid based on a liquid level change of the liquid in the cleaning liquid storage to magnetically trigger the non-contact detector of the first, second, or third detection assembly.

According to the surface cleaning apparatus having the liquid level detection device of at least one embodiment of the present disclosure, the magnetic float includes a float main body portion and a magnetic portion that is provided in an embedded manner inside the float main body portion.

According to the surface cleaning equipment with the liquid level detection device, the float guide part is provided with a guide part cavity and a liquid inlet hole which is communicated with the guide part cavity and an inner cavity of the cleaning liquid storage part.

According to the surface cleaning apparatus having the liquid level detection device of at least one embodiment of the present disclosure, the magnetic float includes two or more magnetic portions provided at different positions of the float main body portion in a vertical direction.

According to the surface cleaning equipment with the liquid level detection device, the number of the magnetic floaters is more than two, at least one limiting part is arranged in the guide part cavity, and the magnetic floaters are spaced by the limiting part.

According to the surface cleaning apparatus having the liquid level detection device of at least one embodiment of the present disclosure, the float guide portion is provided inside the side wall of the cleaning liquid storage portion.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 is a schematic overall configuration diagram of a surface cleaning apparatus of one embodiment of the present disclosure.

Fig. 2 and 3 are partial schematic structural views of a surface cleaning apparatus having a liquid level detection device according to one embodiment of the present disclosure.

Fig. 4 is a schematic structural view of a base according to one embodiment of the present disclosure.

Fig. 5 is a bottom view (with the base removed) of a cleaning liquid storage portion of a surface cleaning apparatus having a liquid level detection device according to one embodiment of the present disclosure.

FIG. 6 is a schematic view of a float and filter holder and base mounting arrangement according to one embodiment of the present disclosure.

FIG. 7 is a schematic structural view of a filter holder according to one embodiment of the present disclosure.

FIG. 8 is a partial schematic structural view at another angle of a surface cleaning apparatus having a liquid level detection device according to one embodiment of the present disclosure.

Fig. 9 is a schematic structural diagram of a two-way, one-way valve according to one embodiment of the present disclosure.

Fig. 10 is a schematic view of another angle configuration of a two-way, one-way valve according to one embodiment of the present disclosure.

Fig. 11-13 are schematic partial cross-sectional structural views of a surface cleaning apparatus having a liquid level detection device according to one embodiment of the present disclosure.

Fig. 14 to 17 are schematic views of a liquid level detection device according to an embodiment of the present disclosure when detecting liquid levels of tanks having different liquid levels.

FIG. 18 is an exploded view of a fluid level detection unit according to one embodiment of the present disclosure.

FIG. 19 is a schematic structural view of a liquid level detection apparatus according to another embodiment of the present disclosure.

Description of the reference numerals

110 cleaning base

120 liquid level detection device

121 magnetic float

122 float guide

123 magnetic signal sensor

124 guide groove

126 position limiting part

130 cleaning liquid storage part

131 base

132 inner casing

133 outer casing

134 water inlet and outlet

140 fluid interaction interface

150 filter

151 water replenishing return pipe

152 filter holder

160 mounting base

170 card connector actuating part

171 card connector

180 pivoting lid

190 two-way one-way valve

191 seat body

192 air intake part

193 air exhaust part

200 main body part

300 recovery storage part

1000 surface cleaning apparatus

1211 float body

1212 magnetic part

1311 first groove

1312 second recess

1313 first positioning groove

1314 stop

1315 locking part

1316 second positioning groove

1331 operating part

1521 outer flange

1522 the fixed part

1523 stop part

1921 first connection part

1922 second connection part

1923 intake vent

1931 third connecting part

1932 fourth connecting part

1933 air vent

13151 stop block.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.

The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in an order reverse to the order described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above … …, "" higher "and" side (e.g., "in the side wall"), etc., to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.

The surface cleaning apparatus with the liquid level detection device of the present disclosure is described in detail below with reference to fig. 1 to 19.

Fig. 1 is a schematic diagram of the overall structure of a surface cleaning apparatus 1000 according to one embodiment of the present disclosure.

Referring to fig. 1, a surface cleaning apparatus 1000 having a liquid level detection device of one embodiment of the present disclosure includes:

a cleaning liquid storage part 130, wherein the cleaning liquid storage part 130 is used for storing cleaning liquid, the cleaning liquid storage part 130 comprises a closed inner cavity, and the inner cavity is formed by surrounding a top wall, a bottom wall and a side wall arranged between the top wall and the bottom wall;

a cleaning base 110, the cleaning base 110 being in fluid communication with the cleaning liquid storage 130 to receive the cleaning liquid supplied from the cleaning liquid storage 130, the cleaning base 110 being capable of wet cleaning a surface to be cleaned based on the cleaning liquid supplied from the cleaning liquid storage 130;

a liquid level detection device 120, wherein the liquid level detection device 120 includes a first detection component and a second detection component, the first detection component is arranged at the upper end of the cleaning liquid storage part 130 to detect a first liquid level (full liquid detection), and the second detection component is arranged at the lower end of the cleaning liquid storage part 130 to detect a second liquid level (no liquid detection);

the first detection assembly comprises a contact detector and a non-contact detector, and the second detection assembly comprises a non-contact detector;

at least a part of the contact detector is disposed at an upper end of the cleaning liquid storage part 130 and extends into an inner cavity of the cleaning liquid storage part 130;

the non-contact detector of the first detecting member and the non-contact detector of the second detecting member are disposed on a sidewall of the cleaning liquid storage 130.

The shape of the cleaning liquid storage 130 shown in fig. 1 is merely exemplary, and those skilled in the art can adjust the shape of the cleaning liquid storage 130, all of which fall within the scope of the present disclosure.

The cleaning base 110 may be a roller brush based cleaning base 110, and one skilled in the art can select/adjust the structure of the cleaning base 110 without departing from the scope of the present disclosure.

As shown in fig. 1, the surface cleaning apparatus 1000 further includes a main body portion 200 and a recovery storage portion 300.

The recovery storage part 300 communicates with the cleaning base 110 to receive the recovery liquid and dirt from the cleaning base 110 and store the recovery liquid and dirt.

A suction source may be provided inside the main body 200, which communicates with the suction port of the cleaning base 110 via the recovery storage 300 and generates suction force to suck the recovery liquid and dirt to the recovery storage 300.

The surface cleaning apparatus 1000 of the present disclosure achieves full liquid detection and no liquid detection of the cleaning liquid storage portion 130 by providing the liquid level detection device 120 having the first detection component and the second detection component.

The first detection assembly is arranged to comprise the contact detector and the non-contact detector, so that the reliability of full liquid detection (such as full water detection) is improved, double-insurance full water detection of the cleaning liquid storage part is formed, and the false alarm of the full water detection is effectively avoided.

According to the surface cleaning apparatus 1000 having the liquid level detection device in accordance with the preferred embodiment of the present disclosure, the contact detector described in the present disclosure includes an electrode probe, and the non-contact detector includes a magnetic signal detector.

Wherein the first level described above may be a full level and the second level may be a no liquid level.

For the surface cleaning apparatus 1000 of the present disclosure having a liquid level detection device, preferably, the liquid level detection device 120 described above further comprises a third detection assembly comprising at least one non-contact detector, the third detection assembly being disposed between the first detection assembly and the second detection assembly to detect at least one intermediate liquid level between the first liquid level and the second liquid level.

For the surface cleaning apparatus 1000 with liquid level detection device of each of the above embodiments, it is preferable that the apparatus further comprises a signal processor, the signal processor generates a first liquid level indicating signal based on the detection signal of the first detection component, and the signal processor generates a second liquid level indicating signal based on the detection signal of the second detection component.

The signal processor of the present disclosure may be in the form of a signal processing circuit board, and may also be in the form of a signal processing chip, which may be disposed within the main body portion 200 of the surface cleaning apparatus 1000 described above.

For the surface cleaning apparatus 1000 having a liquid level detection device of each of the embodiments described above, the signal processor generates the first liquid level indication signal based on the detection signal of the contact detector of the first detection assembly and/or the detection signal of the non-contact detector of the first detection assembly.

The contact detector of the first detection assembly of the present disclosure and the non-contact detector of the first detection assembly preferably set to be synchronously compatible with each other, i.e., any detection means generates a detection signal and the signal processor generates a first liquid level indication signal.

According to the surface cleaning apparatus 1000 with the liquid level detection device of the preferred embodiment of the present disclosure, the signal processor generates at least one intermediate liquid level indication signal based on the detection signal of the third detection assembly.

Wherein the third detection assembly may comprise only one non-contact detector to generate one intermediate level detection signal, or more than two non-contact detectors to generate more than two intermediate level detection signals.

Through setting up the third detection component, can make the liquid level change in the clean liquid storage part 130 of monitoring that this surface cleaning equipment 1000 of this disclosure can be better, can carry out early warning to full liquid level or no liquid level in advance.

With the surface cleaning apparatus 1000 having the liquid level detection device of each of the above embodiments, it is preferable that at least one of the top wall, the bottom wall, and the side wall of the cleaning liquid storage portion 130 is attached with a heat insulating material.

According to the surface cleaning apparatus 1000 having the liquid level detection device of still another preferred embodiment of the present disclosure, at least one of the top wall, the bottom wall, and the side wall of the cleaning liquid storage portion is formed as a heat insulating structure.

Fig. 2 and 3 are schematic partial structural views of a surface cleaning apparatus having a liquid level detection device according to one embodiment of the present disclosure.

As shown in fig. 2 and 3, the cleaning liquid storage part 130 is used to store cleaning liquid; the cleaning liquid storage part 130 is provided with a fluid interaction interface 140, and the fluid interaction interface 140 is communicated with the cleaning liquid storage part 130 so as to add cleaning liquid into the cleaning liquid storage part 130 or extract the cleaning liquid in the cleaning liquid storage part 130 through the fluid interaction interface 140;

referring to fig. 11, the liquid level detection device 120 is used to detect the liquid level in the cleaning liquid storage 130.

When the liquid level detection device 120 of the present disclosure is used, the liquid level height in the cleaning liquid storage 130 can be accurately obtained, and the operation of water supplement/return can be accurately realized based on the liquid level height obtained by the liquid level detection device 120.

FIG. 5 is a schematic view of yet another partial configuration of a surface cleaning apparatus 1000 having a liquid level detection device according to one embodiment of the present disclosure. FIG. 6 is a schematic view of a float and filter holder and base mounting arrangement according to one embodiment of the present disclosure. FIG. 7 is a schematic structural view of a filter holder according to one embodiment of the present disclosure.

In the present disclosure, as shown in fig. 4 to 7, the cleaning liquid storage part 130 includes:

the base plate 131 is provided with a plurality of grooves,

an inner housing 132, wherein the inner housing 132 is disposed on the base 131, and the inner housing 132 and the base 131 enclose a space for storing cleaning liquid;

an outer housing 133, the outer housing 133 disposed outside of the inner housing 132 and at least partially encasing the inner housing 132.

More preferably, the base 131 is formed with a first recess 1311, and the lower end of the inner housing 132 is inserted into the first recess 1311 of the base 131; and it is preferable that a sealing structure is provided at a junction of the inner case 132 and the base 131 to prevent the tank from leaking.

Similarly, the base 131 is formed with a second groove 1312, the second groove 1312 being located outside the first groove 1311, and the lower end of the outer case 133 being inserted into the second groove 1312.

Also, a sealing joint is optionally provided at the junction of the outer housing 133 and the base to prevent the cleaning liquid in the cleaning liquid storage 130 from leaking out when there is a leakage between the inner housing 132 and the base 131.

Preferably, a sealing structure may be provided at the connection of the outer case 133 and the base; however, when the sealing structure formed by the inner housing 132 and the base 131 is reliable, the sealing structure may not be formed at the connection position of the outer housing 133 and the base 131.

In the present disclosure, at least a portion of the outer case 133 and the inner case 132 are disposed with a predetermined distance therebetween.

In the present disclosure, the at least partially wrapping of the outer shell 133 around the inner shell 132 includes: the outer housing 133 entirely encloses the inner housing 132.

Or considering that the cleaning liquid in the cleaning liquid storage 130 is mainly stored in the lower half of the cleaning liquid storage 130 or in the middle-lower part of the cleaning liquid storage 130, based on this, the outer casing 133 wraps the lower half of the inner casing 132 or includes the middle and lower half of the inner casing 132, and thus the cleaning liquid storage 130 is formed in a double-layered structure to effectively prevent the temperature of the cleaning liquid in the cleaning liquid storage 130 from dropping.

The surface cleaning apparatus 1000 of the present disclosure further includes:

a filter 150, the filter 150 being in communication with the fluid interaction interface 140 for filtering cleaning liquid added through the fluid interaction interface 140.

Preferably, the filter 150 is connected to the fluid interaction interface 140 by a refill water return 151 such that both the added cleaning liquid and the reclaimed cleaning liquid pass through the filter 150.

In the present disclosure, the filter 150 is fixed to the base 131 by the filter holder 152.

Preferably, the base 131 is formed with a first seating groove 1313, and the lower end of the filter holder 152 is seated in the first seating groove 1313.

In the present disclosure, a stopper 1314 is formed on a sidewall of the first positioning groove 1313, an outer flange 1521 is formed on a sidewall of the filter holder 152, and a notch is formed in the outer flange 1521, so that when the filter holder 152 is disposed in the first positioning groove 1313, the notch of the outer flange 1521 is engaged with the stopper 1314 to limit the rotation of the filter holder 152.

When the filter holder 152 is disposed in the first positioning groove 1313, the outer flange 1521 is positioned in the first positioning groove 1313.

In this disclosure, the outer wall surface of the filter holder 152 is formed with at least two fixing portions 1522, and the base 131 is provided with at least two locking portions 1315, so that the fixing portions 1522 and the locking portions 1315 are engaged with each other to lock the filter holder 152.

Preferably, the locking part 1315 realizes locking of the filter holder 152 by restricting up-and-down movement of the filter holder 152.

The locking portion 1315 is formed with a stopper 13151, and a stopper 1523 is formed on the outer circumferential surface of the filter holder 152 to restrict the rotation of the filter holder 152 by the cooperation of the stopper 13151 and the stopper 1523.

In the present disclosure, it is preferable that the external case 133 is provided with an operation part 1331 to mount the cleaning liquid storage part 130 to the surface cleaning apparatus 1000 or to remove it from the surface cleaning apparatus 1000 by operating the operation part 1331.

Among them, the operation portion 1331 is formed in a shape protruding outward from the outer case 133, i.e., in a shape of a handle, and may be integrally formed with the operation portion 1331.

As shown in fig. 2 and 8, the surface cleaning apparatus 1000 of the present disclosure further includes:

and a mounting base 160, wherein the mounting base 160 is provided on the outer case 133 and is positioned above the operation portion 1331.

The surface cleaning apparatus 1000 of the present disclosure further includes:

a snap head actuating portion 170, the snap head actuating portion 170 being movable between a first position and a second position; a through hole is formed in the mounting seat 160, and when the clamping head actuating part 170 is located at the first position, part of the clamping head actuating part 170 penetrates out of the through hole and is located outside the mounting seat 160; when the bayonet catch actuator 170 is in the second position, portions of the bayonet catch actuator 170 are retracted inside the mounting block 160.

As an implementation form, the card joint actuating part 170 can move in the vertical direction, so that the first position of the card joint actuating part 170 is the uppermost position of the card joint actuating part 170; the second position of the snap head actuation part 170 is the lowermost position of the snap head actuation part 170.

In the present disclosure, the outer case 133 is formed with a step, the lower end of the mount 160 is disposed on the step of the outer case 133, and the mount 160 is located outside the outer case 133.

At this time, the inner case 133 may also be stepped such that the cross-sectional area of the upper end of the inner case 133 is smaller than the cross-sectional area of the lower end of the inner case 133.

Preferably, the bayonet joint actuator 170 is disposed between the mounting seats 160 of the outer housing 133 and slides along the outer wall surface of the outer housing 133 and/or the inner wall surface of the mounting seats 160.

A spring is arranged between the bayonet joint actuator 170 and the outer housing 133, the spring being in a pre-compressed state, and when a downward force is applied to the bayonet joint actuator 170, the bayonet joint actuator 170 is moved downward, so that the bayonet joint actuator 170 moves from the first position to the second position; when the external force disappears, the latch actuating portion 170 moves from the second position to the first position by the restoring force of the spring.

In the present disclosure, a portion of the bayonet joint actuating part 170 protruding out of the mounting seat 160 is formed as a bayonet joint 171, and the cleaning liquid storage part 130 is fixed to the surface cleaning apparatus 1000 by clipping the bayonet joint 171 to the housing of the surface cleaning apparatus.

The upper surface of the chucking head 171 is formed in an inclined shape, and the upper surface of the chucking head 171 is inclined downward in the direction of mounting the cleaning liquid storage section 130 to the surface cleaning apparatus 1000, so that it is convenient for a user to mount the cleaning liquid storage section 130 to the surface cleaning apparatus 1000.

In the present disclosure, it is preferable that the upper wall of the cleaning liquid storage part 130 is formed with a water inlet and outlet 134 to add the washing liquid to the inside of the cleaning liquid storage part 130 through the water inlet and outlet 134. When the user takes out the cleaning liquid storage part 130, the cleaning liquid may be manually added to the inside of the cleaning liquid storage part 130 through the water inlet and outlet 134, and when the cleaning liquid storage part 130 is turned upside down, the remaining cleaning liquid inside the tank may be discharged.

The surface cleaning apparatus 1000 of the present disclosure further comprises:

a pivoting cover 180, the pivoting cover 180 being rotatably provided to the mounting seat 160 such that the pivoting cover 180 can open and close the water inlet and outlet port 134.

Preferably, a hole is provided on the pivoting cover 180 to introduce or discharge air into or from the interior of the cleaning liquid storage part 130 through the hole of the pivoting cover.

Fig. 9 is a schematic structural view of a bidirectional one-way valve according to one embodiment of the present disclosure. Fig. 10 is a schematic view of another angle configuration of a two-way, one-way valve according to one embodiment of the present disclosure.

For example, as shown in fig. 9 and 10, the pivoting cover 180 is provided with a two-way one-way valve 190, and the two-way one-way valve 190 is in communication with a hole of the pivoting cover 180 for supplying or exhausting gas into or out of the cabinet.

As one implementation form, the bidirectional one-way valve 190 includes:

a seat body 191, which may be disposed on the pivoting cover 180, and the seat body 191 may be cylindrical and communicated with the hole of the pivoting cover 180; of course, the seat body 191 can also be in other shapes, and the shape of the seat body is not limited in the disclosure;

an air inlet 192, the air inlet 192 being disposed on the seat body 191 such that air enters the cleaning liquid storage part 130 through the seat body 191 and the air inlet 192;

an exhaust part 193, the exhaust part 193 is disposed at the holder body 191 such that the gas is discharged to the outside of the cleaning liquid storage part 130 through the holder body 191 and the exhaust part 193.

As one implementation form, the air intake portion 192 includes:

first connectors 1921, portions of first connectors 1921 are connected to base 191;

second connecting portion 1922, a portion of second connecting portion 1922 is connected to base 191, and first connecting portion 1921 is connected to second connecting portion 1922, and a connection point of first connecting portion 1921 and second connecting portion 1922 is located at a position where first connecting portion 1921 and second connecting portion 1922 are far away from base 191;

a plurality of air inlet holes 1923 are opened at a connection portion of the first connection portion 1921 and the second connection portion 1922, so that when the air pressure inside the bidirectional one-way valve 190 is higher than the air pressure outside the bidirectional one-way valve 190, the air inside the bidirectional one-way valve 190 flows to the outside of the bidirectional one-way valve 190 through the air inlet holes 1923.

In the present disclosure, a first opening is formed between the first connecting portion 1921 and the second connecting portion 1922, and the first opening is disposed toward the base 191.

That is, the first and

second connectors

1921 and 1922 are formed in a V-shape, and the intake holes are located at the tip of the V-shape.

First and

second connections

1921, 1922 preferably form a first included angle therebetween, and preferably the first included angle is about 90 °, such as 60-120 °.

Preferably, the exhaust part 193 includes:

the third connecting portion 1931, and a portion of the third connecting portion 1931 is connected to the seat body 191;

the fourth link 1932, a portion of the fourth link 1932 is connected to the seat body 191, and the third link 1931 is connected to the fourth link 1932,

the connection point of the third connecting portion 1931 and the fourth connecting portion 1932 is located at a position where the third connecting portion 1931 and the fourth connecting portion 1932 are close to the seat body 191.

A plurality of exhaust holes 1933 are formed at a connection between the third connecting portion 1931 and the fourth connecting portion 1932, so that when the air pressure outside the bidirectional one-way valve 190 is higher than the air pressure inside the bidirectional one-way valve 190, the air outside the bidirectional one-way valve 190 flows into the bidirectional one-way valve 190 through the exhaust holes 1933.

In this disclosure, a second opening is formed between the third connecting portion 1931 and the fourth connecting portion 1932, and the second opening is disposed toward a direction away from the seat body 191.

That is, the third and fourth connecting

portions

1931 and 1932 are formed in a V shape, and the exhaust hole 1933 is located at the tip of the V shape.

Preferably, the third connecting portion 1931 and the fourth connecting portion 1932 form a second included angle therebetween, and preferably, the second included angle is about 90 °, for example, 60 ° to 120 °.

In the present disclosure, the bidirectional one-way valve 190 further includes an intermediate connection portion connected to the first, second, third and

fourth connection portions

1921, 1922, 1931 and 1932, so that gas can only flow from the inside of the bidirectional one-way valve 190 to the outside of the bidirectional one-way valve 190 through an intake hole, and so that gas can only flow from the outside of the bidirectional one-way valve 190 to the inside of the bidirectional one-way valve 190 through an exhaust hole.

The two-way one-way valve of the present disclosure is made of an elastic material, for example, the air inlet portion and the air outlet portion are made of an elastic material, and preferably, the elastic material is silicone.

Therefore, when the bidirectional one-way valve is used, due to the special structural design of the air inlet part and the air outlet part, the effect that force is applied to the inner corner of the V shape is inconsistent with the effect that force is applied to the outer corner of the V shape, and the inner corner is applied to form an air pressure cavity more easily, so that an air inlet hole or an air outlet hole is opened; and the air can not form an air pressure cavity at the outer corner, so that the air inlet hole or the air exhaust hole can not be opened, and therefore, when the air pressures at the two sides of the V shape are inconsistent, the air flow at the high air pressure side is exhausted to the low air pressure side through the air inlet hole or the air exhaust hole at the inner corner of the V shape.

Fig. 11-13 are schematic partial cross-sectional structural views of a surface cleaning apparatus according to one embodiment of the present disclosure.

According to an embodiment of the present disclosure, as shown in fig. 11 to 13, the liquid level detection apparatus 120 includes:

a magnetic float 121, the magnetic float 121 comprising a float body 1211 and a magnetic portion 1212;

a float guide 122 along which the magnetic float 121 is movable in a vertical direction based on a change in liquid level by buoyancy of the liquid;

a plurality of magnetic signal sensors 123, the plurality of magnetic signal sensors 123 being disposed in a vertical direction, when the magnetic float 121 triggers one of the plurality of magnetic signal sensors 123, the triggered magnetic signal sensor 123 generates a trigger signal.

In the present disclosure, the sectional type liquid level detection of the cleaning liquid storage part 130 can be realized by the arrangement of the plurality of magnetic signal sensors 123. That is, a plurality of magnetic signal sensors are provided from the bottom to the top on the inner wall or the outer wall of the cleaning liquid storage unit 130, and it is determined whether the liquid level is at a low level, a medium level, or a high level according to three high and low trigger points.

In the present disclosure, the magnetic float 121 is disposed inside the cleaning liquid storage portion 130, the plurality of magnetic signal sensors 123 are disposed outside the cleaning liquid storage portion 130 along a vertical direction, the plurality of magnetic signal sensors 123 are disposed at a plurality of different liquid levels, when a certain magnetic signal sensor 123 is triggered (facing or entering a predetermined distance), the magnetic signal sensor 123 generates a trigger signal, the trigger signal is generally an electrical signal, the trigger signal may indicate a current liquid level, for accuracy of liquid level measurement, more than three magnetic signal sensors 123 may be disposed, and the magnetic float 121 may be only one.

The float guide portion 122 may be a guide frame structure, and a guide groove 124 (or a guide rail) is formed on the float guide portion 122.

Wherein the magnetic portion 1212 may be a permanent magnet or a magnet, the float body 1211 may be made of a low density material, for example, the float body 1211 may be prepared from foamed plastic, wherein the float may be replaced periodically.

In the present disclosure, the number of the magnetic portions 1212 in the float body 1211 may be one, and in this case, the upper surface of the float may be flush with the liquid surface by adjusting the size of the float body 1211, the mass of the magnetic portion, and the installation position of the magnetic portion, or the magnetic portion may be located right at the liquid surface when the float floats on the liquid surface.

Of course, the magnetic portion 1212 in the float body 1211 may be provided in plural, in which case at least two magnetic portions 1212 are provided at different heights of the float body 1211 in the vertical direction; at this time, the size of the float body 1211, the mass of the magnetic portion 1212, and the installation position of the magnetic portion 1212 may be adjusted so that the upper surface of the float is flush with the liquid surface, or so that the magnetic portion 1212 positioned uppermost is positioned at the liquid surface when the float floats on the liquid surface.

Thus, by providing the plurality of magnetic portions 1212, it is possible to ensure that the magnetic signal sensor 123 is triggered by the magnetic portions more stably, and to reduce the probability of the float triggering the magnetic signal sensor 123 failing.

According to a preferred embodiment of the present disclosure, the number of the magnetic floats 121 of the liquid level detecting device 120 is two or more, the number of the magnetic signal sensors 123 is one more than the number of the magnetic floats 121, the float guide 122 is provided with the same number of guide grooves 124 as the magnetic floats 121, the respective magnetic floats 121 move along the respective guide grooves 124 based on a change in the liquid level by the buoyancy of the liquid, and each magnetic signal sensor 123 can be triggered by only one float.

In the present embodiment, each magnetic signal sensor 123 can be preferably directly opposite to only one magnetic float 121, that is, can be triggered by only one magnetic float 121, and more preferably, the upper float can trigger the upper sensor and the middle sensor based on the change of the liquid level, and the lower float can trigger only the lower sensor.

Alternatively, it may be provided that the upper float is able to trigger the upper sensor based on a change in the liquid level and the lower float is able to trigger the middle sensor and the lower sensor.

In the present embodiment, the moving range of each magnetic float 121 may be defined by the respective guide grooves 124.

According to still another preferred embodiment of the present disclosure, the number of the magnetic floats 121 of the liquid level detection device 120 is two or more, the number of the magnetic signal sensors 123 is one more than the number of the magnetic floats 121, the float guide portion 122 is provided with one less limit portion 126 than the number of the magnetic floats 121, each magnetic float 121 moves along the float guide portion 122 based on a change in the liquid level under the buoyancy of the liquid, two adjacent magnetic floats 121 are spaced by one limit portion 126, and each magnetic signal sensor 123 can be triggered by only one magnetic float 121.

In this embodiment, the float guide portion 122 has a cavity, each magnetic float 121 is disposed in the cavity of the float guide portion 122, and two adjacent magnetic floats 121 are separated by a limiting portion 126.

With the liquid level detection device 120 of each of the above embodiments, it is preferable that the number of the magnetic floats 121 is two, that is, the upper float and the lower float, and the number of the magnetic signal sensors 123 is three, that is, the upper sensor, the middle sensor, and the lower sensor, the upper sensor and the middle sensor being capable of being triggered by the upper float, and the lower sensor being capable of being triggered by the lower float.

Preferably, the upper float moves between the upper sensor and the middle sensor, the upper float can trigger the upper sensor or the middle sensor based on the change of the liquid level, when the upper float is positioned between the upper sensor and the middle sensor, the upper sensor is not triggered, the middle sensor is not triggered, and the lower float can only trigger the lower sensor based on the change of the liquid level.

According to an alternative preferred embodiment of the present disclosure, the number of the magnetic floats 121 of the liquid level detection device 120 is two, i.e., an upper float and a lower float, and the number of the magnetic signal sensors 123 is three, i.e., an upper sensor, a middle sensor, and a lower sensor, the upper sensor being capable of being triggered by the upper float only, and the middle sensor and the lower sensor being capable of being triggered by the lower float.

In this embodiment, the upper float moves between the upper sensor and the middle sensor, the upper float can only trigger the upper sensor based on the change of the liquid level, and when the upper float is located between the upper sensor and the middle sensor, the upper sensor is not triggered, the middle sensor is not triggered, and the lower float can trigger the middle sensor or the lower sensor based on the change of the liquid level.

With the liquid level detection device 120 of each of the above embodiments, it is preferable that the magnetic portion 1212 is embedded within the float body 1211.

For the liquid level detection device 120 of each of the above embodiments, the magnetic signal sensor 123 may be a hall sensor or a reed pipe device.

With the liquid level detection device 120 of each of the above embodiments, the float guide 122 is disposed inside the cleaning liquid storage portion 130, and the magnetic signal sensor 123 is disposed outside the cleaning liquid storage portion 130.

Among them, the float guide 122 may be fixed on the inner wall of the cleaning liquid storage 130, and the magnetic signal sensor 123 may be fixed on the outer wall of the cleaning liquid storage 130 or on a support portion adjacent to the cleaning liquid storage 130.

With the liquid level detection device 120 of each of the above embodiments, it is preferable that when the upper float is located at the highest position of the upper float, the upper float triggers the upper sensor, the upper sensor generates the first trigger signal, and the middle sensor and the lower sensor do not generate the trigger signals.

At this time, the lower float is located at the highest position of the lower float, and the lower float does not trigger the middle sensor and the lower sensor.

With the liquid level detection device 120 of each of the above embodiments, it is preferable that when the upper float is located between the upper sensor and the middle sensor, the upper float does not trigger the upper sensor, and the upper sensor, the middle sensor, and the lower sensor do not generate a trigger signal.

In the liquid level detection device 120 according to each of the above embodiments, it is preferable that the upper float triggers the middle sensor, the middle sensor generates the second trigger signal, and the upper sensor and the lower sensor do not generate the trigger signal when the upper float is located at the lowest position of the upper float and the lower float is higher than the lowest position of the lower float.

With the liquid level detection device 120 of each of the above embodiments, it is preferable that when the upper float is located at the lowest position of the upper float and the lower float is located at the lowest position of the lower float, the upper float triggers the middle sensor, the middle sensor generates the second trigger signal, the lower float triggers the lower sensor, and the lower sensor generates the third trigger signal.

The first, second, and third trigger signals described above are merely to distinguish between trigger signals generated by three different sensors.

For the liquid level detection device 120 of each of the above embodiments, it is preferable that the liquid level detection device further includes a signal processor, the signal processor is connected in communication with the magnetic signal sensor 123, and the signal processor generates a corresponding liquid level indication signal based on the trigger state of each magnetic signal sensor 123.

For example, when the upper sensor generates a first trigger signal, the middle sensor and the lower sensor do not generate a trigger signal, the signal processor generates a first level indicating signal, which may indicate that the cleaning liquid storage 130 is at a full liquid level, as shown in fig. 14.

When the upper sensor, the middle sensor and the lower sensor do not generate the trigger signal, the signal processor generates a second liquid level indicating signal, and the second liquid level indicating signal may indicate that the liquid level of the cleaning liquid storage part 130 is below the full liquid level and above the middle sensor, as shown in fig. 15.

The middle sensor generates a second trigger signal, and the upper and lower sensors do not generate a trigger signal, the signal processor generates a third level indicating signal, which may indicate that the liquid level of the cleaning liquid storage 130 is below the reminder level and above the lowest liquid level, as shown in fig. 16.

Further, when the middle sensor generates the second trigger signal and the lower sensor generates the third trigger signal, the signal processor generates a fourth liquid level indicating signal indicating that the liquid level of the cleaning liquid storage part 130 is at the lowest liquid level, as shown in fig. 17.

With the liquid level detection device 120 of each of the above embodiments, preferably, when the upper float is located at the highest position of the upper float, the upper float triggers the upper sensor, the upper sensor generates the first trigger signal, the lower float triggers the middle sensor, the middle sensor generates the second trigger signal, and the lower sensor does not generate the trigger signal.

At this time, the lower float is located at the highest position of the lower float, and the lower float triggers the middle sensor.

With the liquid level detection apparatus 120 of each of the above embodiments, preferably, when the upper float is located between the upper sensor and the middle sensor, the upper float does not trigger the upper sensor, the lower float triggers the middle sensor, the middle sensor generates the second trigger signal, and the lower sensor does not generate the trigger signal.

At this time, the lower float is located at the highest position of the lower float, and the lower float does not trigger the lower sensor.

With the liquid level detection device 120 of each of the above embodiments, it is preferable that the upper float does not trigger the upper sensor and the lower float does not trigger the middle sensor and the lower sensor when the upper float is located at the lowest position of the upper float and the lower float is higher than the lowest position of the lower float.

With the liquid level detection device 120 of each of the above embodiments, it is preferable that when the upper float is located at the lowest position of the upper float and the lower float is located at the lowest position of the lower float, the upper float does not trigger the upper sensor, the lower float triggers the lower sensor, and the lower sensor generates the third trigger signal.

For the liquid level detection device 120 of each of the above embodiments, it is preferable that the signal processor is connected in communication with the magnetic signal sensor 123, and the signal processor generates the corresponding liquid level indication signal based on the trigger state of each magnetic signal sensor 123.

For example, the upper sensor generates a first trigger signal, the middle sensor generates a second trigger signal, and the signal processor generates a first level indicator signal when the lower sensor does not generate a trigger signal, which may indicate that the cleaning liquid storage 130 is at a full liquid level.

The upper sensor does not generate the first trigger signal, the middle sensor generates the second trigger signal, and the signal processor generates the second liquid level indicating signal when the lower sensor does not generate the trigger signal, which may indicate that the liquid level of the cleaning liquid storage 130 is below the full liquid level and above the middle sensor (the middle sensor position may be set as the reminder liquid level).

When the upper sensor, the middle sensor and the lower sensor do not generate the trigger signal, the signal processor generates a third liquid level indicating signal, and the third liquid level indicating signal can indicate that the liquid level of the cleaning liquid storage part 130 is below the reminding liquid level and above the lowest liquid level.

The upper sensor does not generate a trigger signal, the middle sensor does not generate a trigger signal, and the lower sensor generates a third trigger signal, the signal processor generates a fourth liquid level indicating signal indicating that the liquid level of the cleaning liquid storage part 130 is at the lowest liquid level.

For the liquid level detection apparatus 120 of each of the above embodiments, the signal processor further includes a communication module, and the signal processor can transmit the liquid level indicating signal described above to a terminal device, such as a mobile terminal device like a mobile phone, or a desktop computer device, etc., through the communication module.

In the present disclosure, the base 131 of the cleaning liquid storage part 130 is formed with a second positioning groove 1316, and the lower end of the float guide 122 is disposed in the second positioning groove 1316.

In the present disclosure, when the level value detected by the capacitance liquid level meter and/or the photoelectric liquid level meter is 30, calculated by the total liquid level height 100, it corresponds to a first preset value; when the liquid level value detected by the capacitance liquid level meter and/or the photoelectric liquid level meter is 70, corresponding to a second preset value; that is, 0-30 (excluding 30) is a low level; 30-70 is the middle liquid level; 70-100 (excluding 70) are high levels.

In the present disclosure, the cleaning liquid storage 130 is detachably mounted to the body of the surface cleaning apparatus 1000.

Specifically, the cleaning liquid storage 130 may be mounted to the body of the surface cleaning apparatus by means of screw fixation, or may be mounted to the body of the surface cleaning apparatus by means of a snap.

When the cleaning liquid storage 130 is detachably mounted on the surface cleaning apparatus, a child lock may be provided, and after the child lock is released, the latch actuating portion can be actuated to detach the cleaning liquid storage 130.

On the other hand, the cleaning liquid storage 130 is non-detachably attached to the body of the surface cleaning apparatus, and for example, a tank having a liquid level detection device is integrally formed with the body of the surface cleaning apparatus.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. A surface cleaning apparatus having a liquid level detection device, comprising:

a cleaning base in fluid communication with the cleaning liquid reservoir to receive cleaning liquid provided by the cleaning liquid reservoir, the cleaning base being capable of wet cleaning a surface to be cleaned based on the cleaning liquid provided by the cleaning liquid reservoir; and

the liquid level detection device comprises a first detection component and a second detection component, the first detection component is arranged at the upper end part of the cleaning liquid storage part to detect a first liquid level, and the second detection component is arranged at the lower end part of the cleaning liquid storage part to detect a second liquid level;

wherein the first detection assembly comprises a contact detector and a non-contact detector and the second detection assembly comprises a non-contact detector;

2. A surface cleaning apparatus as claimed in claim 1, characterised in that the contact detector comprises an electrode probe and the non-contact detector comprises a magnetic signal detector.

3. The surface cleaning apparatus having a level detection device of claim 1, wherein the first level is a full level and the second level is a no liquid level.

4. The surface cleaning apparatus of claim 3 having a liquid level detection device, further comprising a third detection assembly comprising at least one non-contact detector, the third detection assembly being disposed between the first detection assembly and the second detection assembly to detect at least one intermediate liquid level between the first liquid level and the second liquid level.

5. The surface cleaning apparatus with a liquid level detection device of any of claims 1-3, further comprising a signal processor that generates a first liquid level indicating signal based on the detection signal of the first detection assembly, the signal processor generating a second liquid level indicating signal based on the detection signal of the second detection assembly.

6. A surface cleaning apparatus having a liquid level detection device according to claim 5, characterised in that the signal processor generates the first liquid level indication signal based on a detection signal of a contact detector of the first detection assembly and/or a detection signal of a non-contact detector of the first detection assembly.

7. The surface cleaning apparatus having a liquid level detection device of claim 4, further comprising a signal processor that generates a first liquid level indicating signal based on the detection signal of the first detection assembly, the signal processor generating a second liquid level indicating signal based on the detection signal of the second detection assembly.

8. The surface cleaning apparatus of claim 7 having a liquid level detection device, wherein the signal processor generates at least one intermediate liquid level indication signal based on the detection signal of the third detection assembly.

9. The surface cleaning apparatus having a liquid level detection device of any of claims 1 to 4, wherein at least one of the top wall, bottom wall and side walls is attached with a thermal insulation material.

10. The surface cleaning apparatus with a liquid level detection device of any of claims 1-4, wherein at least one of the top wall, bottom wall and side walls is formed as a heat insulating structure.

11. The surface cleaning apparatus having a liquid level detection device of any of claims 2-4, wherein the liquid level detection device further comprises at least one magnetic float, the non-contact detector generating a detection signal based on magnetic triggering of the non-contact detector by the at least one magnetic float.

12. The surface cleaning apparatus having a liquid level detection device of claim 11, further comprising a float guide along which the magnetic float is movable in a vertical direction under buoyancy of the liquid to magnetically trigger the non-contact detector of the first, second, or third detection assembly based on a change in the liquid level of the liquid in the cleaning liquid storage portion.

13. The surface cleaning apparatus having a liquid level detection device of claim 11, wherein the magnetic float comprises a float body portion and a magnetic portion disposed in an embedded manner within the float body portion.

14. The surface cleaning apparatus having a liquid level detection device of claim 12, wherein the float guide has a guide cavity and an inlet hole communicating the guide cavity and an inner cavity of the cleaning liquid storage.

15. The surface cleaning apparatus having a liquid level detection device of claim 13, wherein the magnetic float comprises two or more magnetic portions disposed at different positions of the float main body portion in a vertical direction.

16. The surface cleaning apparatus with a liquid level detection device as recited in claim 14, wherein the number of the magnetic floats is two or more, at least one limiting portion is disposed in the cavity of the guide portion, and the magnetic floats are spaced apart by the limiting portion.

17. The surface cleaning apparatus with a liquid level detection device of claim 12, wherein the float guide is disposed inside the side wall of the cleaning liquid storage portion.