CN214804498U

CN214804498U - Liquid storage tank with liquid level detection device and surface cleaning equipment

Info

Publication number: CN214804498U
Application number: CN202120874855.2U
Authority: CN
Inventors: 徐晓龙; 曹传源; 唐成; 段飞; 钟亮
Original assignee: Beijing Shunzao Technology Co Ltd
Current assignee: Beijing Shunzao Technology Co Ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2021-11-23
Anticipated expiration: 2031-04-26

Abstract

The present disclosure provides a liquid reserve tank with liquid level detection device, it includes: a tank for storing a cleaning liquid; the fluid interaction interface is arranged on the box body and communicated with the box body so as to add cleaning liquid into the box body or extract the cleaning liquid in the box body through the fluid interaction interface; the liquid level detection device is used for detecting the liquid level in the box body; the liquid level detection device comprises a plurality of magnetic signal sensors, the magnetic signal sensors are arranged along the height direction of the box body, and the liquid level in the box body is obtained according to data detected by the magnetic signal sensors; or the liquid level detection device comprises a liquid level meter, and the liquid level in the tank body is obtained according to the data detected by the liquid level meter. The present disclosure also provides a surface cleaning apparatus.

Description

Liquid storage tank with liquid level detection device and surface cleaning equipment

Technical Field

The present disclosure relates to a liquid storage tank and a surface cleaning apparatus having a liquid level detection device.

Background

Surface cleaning devices of the prior art are typically used for wet scrubbing cleaning of hard floors or short hair carpets. Such cleaning devices 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 cleaning device is moved over the dirt, the dirt which has been wiped off by the drum brush and dissolved by the water or the water/detergent mixture is sucked up by the cleaning heads arranged in the direction of movement of the drum brush, and in the technique of providing the cleaning tray, the cleaning head may not be provided and the dirt is directly adsorbed by the cleaning material on the cleaning tray.

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. The reasonable and effective scheme is that the surface cleaning device is cleaned by heating water, the energy loss of the surface cleaning device is reduced by considering the problems of cruising and water continuation of the cleaning device, and the energy loss is transferred to a water storage base station (supply 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 device returns to the base station, is in butt joint with a base station water tank through a water adding joint, realizes automatic water supplement, and then continues to be cleaned by hot water. Or the cleaning action is finished, the surface cleaning device 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.

Therefore, it is necessary to incorporate a liquid level detecting device in the surface cleaning apparatus to detect the liquid level of the surface cleaning apparatus, thereby achieving water replenishing/returning operation.

SUMMERY OF THE UTILITY MODEL

In order to solve one of the technical problems, the present disclosure provides a liquid storage tank with a liquid level detection device and a surface cleaning apparatus.

According to an aspect of the present disclosure, there is provided a liquid storage tank having a liquid level detection apparatus, including:

a tank for storing a cleaning liquid;

the fluid interaction interface is arranged on the box body and communicated with the box body so as to add cleaning liquid into the box body or extract the cleaning liquid in the box body through the fluid interaction interface; and

the liquid level detection device is used for detecting the liquid level in the box body;

the liquid level detection device comprises a plurality of magnetic signal sensors, the magnetic signal sensors are arranged along the height direction of the box body, and the liquid level in the box body is obtained according to data detected by the magnetic signal sensors; or the liquid level detection device comprises a liquid level meter, and the liquid level in the tank body is obtained according to the data detected by the liquid level meter.

According to at least one embodiment of this disclosure, a liquid storage tank with a liquid level detection device, the tank body includes:

a base seat is arranged on the base seat,

the inner shell is arranged on the base, and a space for storing cleaning liquid is enclosed by the inner shell and the base; and

an outer housing disposed outside of the interior and at least partially encasing the inner housing.

According to the liquid storage tank with the liquid level detection device of at least one embodiment of the present disclosure, the base is formed with a first groove, and the lower end of the inner housing is inserted into the first groove of the base.

According to the liquid storage tank with the liquid level detection device of at least one embodiment of the present disclosure, the base is formed with a second groove located outside the first groove, and a lower end of the outer case is inserted into the second groove.

According to the liquid storage tank with the liquid level detection device, at least part of the outer shell and the inner shell are arranged at a preset distance.

The liquid storage tank with the liquid level detection device according to at least one embodiment of the present disclosure further includes:

a filter in communication with the fluid interaction interface to filter cleaning liquid added through the fluid interaction interface.

According to the liquid storage tank with the liquid level detection device, the filter is connected to the fluid interaction interface through the water supplementing return pipe, so that the added cleaning liquid and the recovered cleaning liquid can both pass through the filter.

According to the liquid storage tank with the liquid level detection device of at least one embodiment of the present disclosure, the filter is fixed to the base through the filter holder.

According to the liquid storage tank with the liquid level detection device of at least one embodiment of the present disclosure, the base is formed with a first positioning groove, and the lower end of the filter support is disposed in the first positioning groove.

According to at least one embodiment's of this disclosure stock solution case with liquid level detection device, be formed with the dog on the lateral wall of first constant head tank, be formed with outer flange on the lateral wall of filter holder, outer flange is formed with the breach to when the filter holder set up in the first constant head tank, the breach of outer flange with the dog cooperation restricts the rotation of filter holder.

According to the liquid storage tank with the liquid level detection device, when the filter support is arranged in the first positioning groove, the outer flange is located in the first positioning groove.

According to at least one embodiment's of this disclosure stock solution case with liquid level detection device, the outer wall of filter holder is formed with two at least fixed parts, the base is provided with two at least locking parts to through the fixed part with the cooperation of locking part realizes the locking of filter holder.

According to the liquid storage tank with the liquid level detection device of at least one embodiment of the present disclosure, the locking portion realizes locking of the filter holder by restricting up-and-down movement of the filter holder.

According to the liquid storage tank with the liquid level detection device, the locking part is provided with the limiting block, and the outer peripheral surface of the filter support is provided with the stop piece, so that the rotation of the filter support is limited through the matching of the limiting block and the stop piece.

According to the liquid storage tank with the liquid level detection device of at least one embodiment of the present disclosure, the outer shell is provided with an operation part, so that the liquid storage tank with the liquid level detection device can be installed on or removed from the surface cleaning equipment by operating the operation part.

a mount provided to the outer case and located above the operation portion.

a bayonet joint actuation portion movable between a first position and a second position; when the clamping head actuating part is positioned at the first position, part of the clamping head actuating part penetrates out of the through hole and is positioned outside the mounting seat; when the bayonet joint actuating part is in the second position, the part of the bayonet joint actuating part retracts into the inner part of the mounting seat.

According to the liquid storage tank with the liquid level detection device, the clamping head actuating part can move in the vertical direction, so that the first position of the clamping head actuating part is the uppermost position of the clamping head actuating part; the second position of the clamping head actuating part is the lowest end position of the clamping head actuating part.

According to the liquid storage tank having the liquid level detection apparatus of at least one embodiment of the present disclosure, the outer case is formed with a step, the lower end of the mount is disposed on the step of the outer case, and the mount is located outside the outer case.

According to the liquid storage tank with the liquid level detection device, the clamping head actuating portion is arranged between the installation seats of the outer shell and slides along the outer wall surface of the outer shell and/or the inner wall surface of the installation seats.

According to the liquid storage tank with the liquid level detection device, a spring is arranged between the clamping head actuating part and the outer shell, the spring is in a pre-compression state, and when downward external force is applied to the clamping head actuating part in a direction, the clamping head actuating part moves downwards, so that the clamping head actuating part moves from a first position to a second position; when the external force disappears, the clamping head actuating part moves from the second position to the first position under the action of the restoring force of the spring.

According to the liquid storage tank with the liquid level detection device, the part, extending out of the mounting seat, of the clamping head actuating part is formed into a clamping head, and the liquid storage tank with the liquid level detection device is fixed to the surface cleaning equipment through clamping the clamping head on the shell of the surface cleaning equipment.

According to the liquid storage tank with the liquid level detection device of at least one embodiment of the present disclosure, the upper surface of the bayonet is formed in an inclined shape, and the upper surface of the bayonet is inclined downward in a direction in which the liquid storage tank with the liquid level detection device is mounted to the surface cleaning apparatus.

According to the liquid storage tank with the liquid level detection device, the upper wall of the tank body is provided with the water inlet and outlet, so that the cleaning liquid is added into the tank body through the water inlet and outlet.

a pivoting cover rotatably provided to the mounting seat such that the pivoting cover can open and close the water inlet and outlet.

According to the liquid storage tank with the liquid level detection device, the pivot cover is provided with a hole, so that air can be fed or exhausted into the tank body through the hole of the pivot cover.

According to at least one embodiment of this disclosure's stock solution case with liquid level detection device, liquid level detection device includes electric capacity level gauge and/or photoelectricity level gauge, electric capacity level gauge and/or photoelectricity level gauge set up in the inside and/or the outside of box to through electric capacity level gauge and/or photoelectricity level gauge detect the liquid level in the box.

A liquid tank having a liquid level detection apparatus according to at least one embodiment of the present disclosure, the liquid level detection apparatus including:

a float including a float body and a magnetic portion;

a float guide along which the float is movable in a vertical direction based on a change in a liquid level under a buoyancy of the liquid; and

and the plurality of magnetic signal sensors are arranged along the vertical direction, and when the floater triggers one of the plurality of magnetic signal sensors, the triggered magnetic signal sensor generates a triggering signal.

According to the liquid storage tank with the liquid level detection device of at least one embodiment of the present disclosure, each float body is provided with at least two magnetic parts which are provided at different heights of the float body in a vertical direction.

According to the liquid storage tank with the liquid level detection device in at least one embodiment of the present disclosure, the number of the floats is two or more, the number of the magnetic signal sensors is one more than that of the floats, the float guide part is provided with the guide grooves having the same number as the floats, the floats move along the guide grooves based on the change of the liquid level under the action of the buoyancy of the liquid, and each magnetic signal sensor can be triggered by only one float.

According to the liquid storage tank with the liquid level detection device, the number of the floats is more than two, the number of the magnetic signal sensors is one more than that of the floats, the float guide part is provided with the limiting part one less than that of the floats, each float moves along the float guide part based on the liquid level change under the action of liquid buoyancy, two adjacent floats are spaced by the limiting part, and each magnetic signal sensor can be triggered by only one float.

According to the liquid storage tank with the liquid level detection device, the number of the floats is two, namely the upper float and the lower float, the number of the magnetic signal sensors is three, namely the upper sensor, the middle sensor and the lower sensor, the upper sensor and the middle sensor can be triggered by the upper float, and the lower sensor can be triggered by the lower float.

According to the liquid storage tank with the liquid level detection device of at least one embodiment of this disclosure, the quantity of float is two, upper float and lower float, the quantity of magnetic signal sensor is three, go up sensor, well sensor and lower sensor, go up the sensor can only be triggered by the upper float, well sensor and lower sensor can be triggered by the lower float.

According to at least one embodiment of this disclosure's liquid reserve tank with liquid level detection device, the base of box is formed with the second constant head tank, the lower extreme of float guide part set up in the second constant head tank.

According to another aspect of the present disclosure, there is provided a surface cleaning apparatus comprising a tank as described above having a liquid level detection device.

According to the surface cleaning device of at least one embodiment of the present disclosure, the liquid storage tank with the liquid level detection device is detachably mounted to the body of the surface cleaning device.

According to at least one embodiment of the present disclosure, the liquid storage tank with the liquid level detection device is integrally formed with the body of the surface cleaning apparatus.

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 and 2 are schematic structural views of a tank having a liquid level detection apparatus according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural view of a base according to one embodiment of the present disclosure.

FIG. 4 is a bottom view of a tank with a liquid level detection device according to one embodiment of the present disclosure (with the base removed).

FIG. 5 is a schematic view of a float and filter holder and base mounting arrangement according to one embodiment of the present disclosure.

FIG. 6 is a schematic structural view of a filter holder according to one embodiment of the present disclosure.

FIG. 7 is a schematic view of another angle configuration of a tank having a liquid level detection device according to one embodiment of the present disclosure.

Fig. 8 is a schematic structural view of a two-way, one-way valve according to one embodiment of the present disclosure.

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

Fig. 10 to 12 are schematic sectional structural views of a tank having a liquid level detection apparatus according to an embodiment of the present disclosure.

Fig. 13 to 16 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. 17 is an exploded schematic view of a fluid level detection apparatus according to one embodiment of the present disclosure.

FIG. 18 is a schematic structural view of a liquid level detection apparatus according to another embodiment of the present disclosure.

The reference numbers in the figures are in particular:

110 liquid storage tank with liquid level detection device

120 liquid level detection device

121 float

1211 float body

1212 magnetic part

122 float guide

123 magnetic signal sensor

124 guide groove

126 position limiting part

130 case body

131 base

1311 first groove

1312 second recess

1313 first positioning groove

1314 stop

1315 locking part

13151 stop block

1316 second positioning groove

132 inner casing

133 outer casing

1331 operating part

134 water inlet and outlet

140 fluid interaction interface

150 filter

151 water replenishing return pipe

152 filter holder

1521 external flange

1522 fixed part

1523 stop part

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

1921 first connection part

1922 second connection part

1923 air intake hole

193 air exhaust part

1931 third connecting part

1932 fourth connecting part

1933 venting holes.

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 processes described consecutively may be performed substantially simultaneously or in reverse order to that 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., as in "side wall") 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.

As shown in fig. 1 and 2, the present disclosure provides a tank 110 having a liquid level detection apparatus, including:

a tank 130, the tank 130 storing a cleaning liquid;

a fluid interface 140, wherein the fluid interface 140 is disposed on the tank 130 and is communicated with the tank 130, so as to add cleaning liquid into the tank 130 or extract cleaning liquid from the tank 130 through the fluid interface 140; and

a liquid level detection device 120, wherein the liquid level detection device 120 is used for detecting the liquid level in the tank body 130.

When the liquid storage tank 110 with the liquid level detection device is used, the liquid level height in the tank body can be accurately obtained, and water supplementing/returning operation is accurately realized based on the liquid level height obtained by the liquid level detection device.

FIG. 4 is a bottom view of a tank with a liquid level detection device according to one embodiment of the present disclosure (with the base removed). FIG. 5 is a schematic view of a float and filter holder and base mounting arrangement according to one embodiment of the present disclosure. FIG. 6 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 6, the case 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 a cleaning liquid; and

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

More preferably, the base 131 is formed with a first groove 1311, and the lower end of the inner housing 132 is inserted into the first groove 1311 of the base 131; and preferably, a sealing structure is provided at the junction of the inner housing 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.

Furthermore, a sealing joint is optionally provided at the connection between the outer housing 133 and the base to prevent the cleaning liquid in the tank from leaking out when the liquid leaks between the inner housing 132 and the base 131.

That is, a sealing structure may be provided at the junction of the outer case 133 and the base; however, when the sealing structure formed by the inner housing 132 and the base 131 is relatively 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 housing 133 is disposed at a predetermined distance from the inner housing 132.

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

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

The liquid storage tank 110 with the liquid level detection device further comprises:

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

Preferably, the filter 150 is connected to the fluid interaction interface 140 via a water refill 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 on 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 rotation of the filter holder 152.

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

In this disclosure, at least two fixing portions 1522 are formed on an outer wall surface of the filter holder 152, 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 matched to lock the filter holder 152.

Preferably, the locking part 1315 performs 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 an outer circumferential surface of the filter holder 152 to restrict rotation of the filter holder 152 by engagement 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 install or remove the tank 110 having the liquid level detection apparatus to or from the surface cleaning apparatus by operating the operation part 1331.

Wherein 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.

In the present disclosure, as shown in fig. 1 and 7, the liquid storage tank 110 having the liquid level detection apparatus further includes:

and a mounting seat 160, wherein the mounting seat 160 is disposed on the external housing 133 and above the operation portion 1331.

a bayonet joint actuator 170, the bayonet joint actuator 170 being movable between a first position and a second position; a through hole is formed in the mounting seat 160, and when the bayonet joint actuating part 170 is in the first position, a part of the bayonet joint actuating part 170 penetrates out of the through hole and is located outside the mounting seat 160; when the bayonet head actuator 170 is in the second position, portions of the bayonet head actuator 170 are retracted into the interior of the mount 160.

As an implementation form, the card head actuating portion 170 can move in a vertical direction, so that the first position of the card head actuating portion 170 is the uppermost position of the card head actuating portion 170; the second position of the bayonet joint actuator 170 is the lowermost position of the bayonet joint actuator 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 actuating part 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 actuating part 170 and the outer housing 133, the spring is in a pre-compression state, and when a downward external force is applied to the bayonet joint actuating part 170, the bayonet joint actuating part 170 is moved downwards, so that the bayonet joint actuating part 170 moves from a first position to a second position; when the external force disappears, the bayonet joint actuator 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 latch actuating portion 170 protruding out of the mounting seat 160 is formed as a latch 171, and the tank 110 having the liquid level detection device is fixed to the surface cleaning apparatus by latching the latch 171 to a housing of the surface cleaning apparatus.

The upper surface of the card head 171 is formed to be inclined, and the upper surface of the card head 171 is inclined downward in a direction of mounting the tank 110 with the liquid level detection device to the surface cleaning apparatus, so that a user can conveniently mount the tank 110 with the liquid level detection device to the surface cleaning apparatus.

In the present disclosure, it is preferable that the upper wall of the tank 130 is formed with a water inlet and outlet 134 so that the washing liquid is introduced into the inside of the tank 130 through the water inlet and outlet 134. When the user takes out the tank 110 having the liquid level detection means, the cleaning liquid may be manually added to the inside of the tank 130 through the inlet/outlet 134, and when the tank 110 having the liquid level detection means is turned upside down, the cleaning liquid remaining inside the tank may be discharged.

In the present disclosure, the liquid storage tank 110 with a liquid level detection device further includes:

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, the pivoting cover 180 is provided with a hole to allow air to be introduced into or exhausted from the inside of the case 130 through the hole of the pivoting cover.

Fig. 8 is a schematic structural view of a two-way, one-way valve according to one embodiment of the present disclosure. Fig. 9 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. 8 and 9, the pivoting cover 180 is provided with a two-way one-way valve 190, and the two-way one-way valve 190 is communicated with a hole of the pivoting cover 180 for supplying or exhausting gas into or from 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 communicate with the hole of the pivoting cover 180; of course, the seat body 191 may have other shapes, and the shape is not limited in the present disclosure;

an air inlet 192, the air inlet 192 being disposed on the seat body 191 such that air enters the case 130 through the seat body 191 and the air inlet 192; and

and an exhaust part 193, wherein the exhaust part 193 is disposed on the holder body 191 such that gas is exhausted to the outside of the case 130 through the holder body 191 and the exhaust part 193.

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

a first connection portion 1921, a portion of the first connection portion 1921 being connected to the base 191; and

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 the connection between 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 two-way one-way valve 190 is higher than the air pressure outside the two-way one-way valve 190, the air inside the two-way one-way valve 190 flows to the outside of the two-way 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 connecting

portions

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

Preferably, a first included angle is formed between the first connecting portion 1921 and the second connecting portion 1922, and preferably, the first included angle is about 90 °, for example, 60 ° to 120 °.

Preferably, the exhaust part 193 includes:

a third connecting portion 1931, a portion of the third connecting portion 1931 being connected to the holder body 191; and

a fourth connecting portion 1932, a portion of the fourth connecting portion 1932 being connected to the holder body 191, and the third connecting portion 1931 being connected to the fourth connecting portion 1932,

the connection position 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 opened at a connection position of the third connection portion 1931 and the fourth connection portion 1932, so that when the air pressure outside the two-way one-way valve 190 is higher than the air pressure inside the two-way one-way valve 190, the air outside the two-way one-way valve 190 flows to the inside of the two-way 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 this disclosure, the two-way one-way valve 190 further includes an intermediate connection portion, the intermediate connection portion is connected to the first connection portion 1921, the second connection portion 1922, the third connection portion 1931 and the fourth connection portion 1932, so that gas can only pass through the inlet hole flows to from the inside of the two-way one-way valve 190 outside the two-way one-way valve 190, and so that gas can only pass through the exhaust hole flows to from the outside of the two-way one-way valve 190 inside the two-way one-way valve 190.

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 silica gel.

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 the air inlet hole or the 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.

In the present disclosure, preferably, the liquid level detection apparatus 120 includes a capacitance liquid level meter and/or an optoelectronic liquid level meter, which are disposed inside and/or outside the tank body 130, so as to detect the liquid level inside the tank body 130 through the capacitance liquid level meter and/or the optoelectronic liquid level meter.

According to an embodiment of the present disclosure, as shown in fig. 10 to 12, the liquid level detection apparatus 120 includes:

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

a float guide 122 along which the float 121 is movable in a vertical direction based on a change in liquid level by buoyancy of the liquid; and the number of the first and second groups,

a plurality of magnetic signal sensors 123, the plurality of magnetic signal sensors 123 being disposed in a vertical direction, when the 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 tank 130 can be realized by providing the plurality of magnetic signal sensors 123. That is, on the inner wall or the outer wall of the box 130, a plurality of magnetic signal sensors are arranged from the bottom to the top, and the liquid level is judged to be at a low liquid level, a medium liquid level or a high liquid level according to three trigger points of high, medium and low.

On the other hand, the liquid level detection device comprises a liquid level meter, and the liquid level in the box body is obtained according to the data detected by the liquid level meter, so that whether the liquid level is in a low liquid level, a medium liquid level or a high liquid level can be judged according to the continuous liquid level signal.

In the present disclosure, the float 121 is disposed inside the tank 130, the plurality of magnetic signal sensors 123 are disposed outside the tank 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 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, and the float body 1211 may be made of a low-density material, for example, the float body 1211 may be prepared by 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 size of the float body 1211, the mass of the magnetic portion, and the installation position of the magnetic portion may be adjusted so that the upper surface of the float is flush with the liquid surface, or so that the magnetic portion is located 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 plurality, in which case, the 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 just 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 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 floats 121, the float guide 122 is provided with the same number of guide grooves 124 as the number of the floats 121, the respective floats 121 move along the respective guide grooves 124 based on a change in the liquid level by 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 float 121, that is, can be triggered by only one 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 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 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 floats 121, the float guide 122 is provided with one less stopper portion 126 than the number of the floats 121, each float 121 moves along the float guide 122 based on a change in the liquid level by buoyancy of the liquid, adjacent two floats 121 are spaced by one stopper portion 126, and each magnetic signal sensor 123 can be triggered by only one float 121.

In this embodiment, the float guide portion 122 has a cavity, each float 121 is disposed in the cavity of the float guide portion 122, and two adjacent 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 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 floats 121 of the liquid level detecting 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 only by the upper float, 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 provided inside the tank 130, and the magnetic signal sensor 123 is provided outside the tank 130.

In which the float guide 122 may be fixed on an inner wall of the case 130, and the magnetic signal sensor 123 may be fixed on an outer wall of the case 130 or on a support portion adjacent to the case 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 processing device, the processing device is connected in communication with the magnetic signal sensor 123, and the processing device 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 trigger signals, the processing device generates a first level indicating signal, which may indicate that the tank 130 is at a full liquid level, as shown in fig. 13.

When the upper sensor, the middle sensor and the lower sensor do not generate the trigger signal, the processing device generates a second liquid level indicating signal, which may indicate that the liquid level of the tank 130 is below the full liquid level and above the middle sensor, as shown in fig. 14.

The middle sensor generates a second trigger signal, and the upper and lower sensors do not generate a trigger signal, the processing device generates a third liquid level indicating signal, which may indicate that the liquid level of the tank 130 is below the reminder level and above the lowest liquid level, as shown in fig. 15.

Further, when the middle sensor generates the second trigger signal and the lower sensor generates the third trigger signal, the processing device generates a fourth liquid level indicating signal indicating that the liquid level of the tank 130 is at the lowest liquid level, as shown in fig. 16.

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 example, the upper sensor generates a first trigger signal, the middle sensor generates a second trigger signal, and the processing device generates a first level indicator signal when the lower sensor does not generate a trigger signal, which may indicate that the tank 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 processing device generates the second level indicating signal when the lower sensor does not generate the trigger signal, wherein the second level indicating signal can indicate that the liquid level of the tank 130 is below the full liquid level and above the middle sensor (the middle sensor position can be set as the reminding liquid level).

When the upper sensor, the middle sensor and the lower sensor do not generate the trigger signal, the processing device generates a third liquid level indicating signal, and the third liquid level indicating signal can indicate that the liquid level of the box body 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 processing device generates a fourth liquid level indicating signal indicating that the liquid level of the tank body 130 is at the lowest liquid level.

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

In the present disclosure, the base 131 of the housing 130 is formed with a second positioning slot 1316, and the lower end of the float guide 122 is disposed in the second positioning slot 1316.

In an alternative embodiment of the present disclosure, as shown in fig. 18, the liquid level detection apparatus 120 includes:

a capacitive liquid level gauge and/or an opto-electronic liquid level gauge for detecting the liquid level within the tank 130.

For example, the capacitance level gauge and/or the photoelectric level gauge may be disposed in the tank 130 or disposed on an outer wall of the tank 130, thereby obtaining a specific height of the liquid level in the tank 130.

In the present disclosure, when the liquid 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, corresponding 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.

According to another aspect of the present disclosure, there is provided a surface cleaning apparatus comprising a tank 110 as described above having a liquid level detection device.

In the present disclosure, the reservoir 110 having the liquid level detection device is detachably mounted to the body of the surface cleaning apparatus.

Specifically, the liquid storage tank 110 with the liquid level detection device 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 snap-fitting.

Wherein, when liquid reserve tank 110 detachably that has liquid level detection device install in during surface cleaning equipment's fuselage, can be provided with child's lock, remove child's lock after, joint actuating portion can actuate to liquid reserve tank 110 that will have liquid level detection device is demolishd.

On the other hand, the tank 110 with the liquid level detection device is non-detachably mounted to the body of the surface cleaning apparatus, for example, the tank with the 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," etc., 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to be 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 application, "plurality" means at least two, e.g., two, three, etc., unless 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 liquid storage tank with a liquid level detection device, comprising:

a tank for storing a cleaning liquid;

2. A tank with a liquid level detection device according to claim 1, characterized in that said tank comprises:

a base seat is arranged on the base seat,

3. The liquid level detection apparatus as claimed in claim 2, wherein the base is formed with a first recess, and the lower end of the inner housing is inserted into the first recess of the base.

4. A tank having a liquid level detection apparatus according to claim 3, wherein said base is formed with a second recess which is located outside said first recess, and a lower end of said outer casing is inserted into said second recess.

5. A reservoir having a liquid level detection apparatus according to claim 2 wherein at least part of the outer housing and the inner housing are disposed at a predetermined distance from each other.

6. A reservoir having a liquid level detection apparatus as defined in claim 2, further comprising:

7. A tank having a liquid level detection apparatus according to claim 6 wherein the filter is connected to the fluid interaction interface by a refill water return so that both the added cleaning liquid and the recovered cleaning liquid pass through the filter.

8. A reservoir having a liquid level detection apparatus according to claim 6 wherein the filter is secured to the base by a filter holder.

9. The liquid level detection apparatus as claimed in claim 8, wherein the base is formed with a first positioning groove, and the lower end of the filter holder is disposed in the first positioning groove.

10. The fluid reservoir having a fluid level detection apparatus as set forth in claim 9, wherein a stopper is formed on a side wall of the first positioning groove, and an outer flange is formed on a side wall of the filter holder, the outer flange being formed with a notch such that when the filter holder is disposed in the first positioning groove, the notch of the outer flange is engaged with the stopper to restrict rotation of the filter holder.

11. A tank having a liquid level detection apparatus as claimed in claim 10 wherein said outer flange is located within said first detent when said filter holder is disposed within said first detent.

12. The liquid level detection apparatus as claimed in claim 11, wherein the filter holder is formed at an outer wall surface thereof with at least two fixing portions, and the base is provided with at least two locking portions to achieve locking of the filter holder by engagement of the fixing portions with the locking portions.

13. The liquid level detection apparatus according to claim 12, wherein said locking portion locks said filter holder by restricting an up-and-down movement of said filter holder.

14. The liquid level detection apparatus according to claim 13, wherein the locking portion is formed with a stopper, and a stopper is formed on an outer circumferential surface of the filter holder to restrict rotation of the filter holder by engagement of the stopper and the stopper.

15. A tank having a liquid level detection apparatus according to claim 2 wherein the outer housing is provided with an operating portion to enable the tank having the liquid level detection apparatus to be mounted to or removed from a surface cleaning apparatus by operation of the operating portion.

16. A reservoir having a fluid level sensing apparatus as defined in claim 15, further comprising:

a mount provided to the outer case and located above the operation portion.

17. A reservoir having a fluid level sensing apparatus as defined in claim 16, further comprising:

18. The fluid level detection apparatus as claimed in claim 17, wherein said bayonet head actuating portion is movable in a vertical direction such that the first position of said bayonet head actuating portion is an uppermost position of said bayonet head actuating portion; the second position of the clamping head actuating part is the lowest end position of the clamping head actuating part.

19. The fluid reservoir having a fluid level detection apparatus of claim 18, wherein the outer housing is formed with a step, a lower end of the mounting seat is disposed on the step of the outer housing, and the mounting seat is located outside the outer housing.

20. The fluid reservoir having a fluid level detection apparatus of claim 19, wherein the bayonet joint actuating portion is disposed between the mounting seats of the outer housing and slides along an outer wall surface of the outer housing and/or an inner wall surface of the mounting seats.

21. The fluid level detection apparatus as claimed in claim 20, wherein a spring is disposed between the bayonet joint actuator and the outer housing, the spring being in a pre-compressed state, and when a downward force is applied to the bayonet joint actuator, the spring causes the bayonet joint actuator to move downward, causing the bayonet joint actuator to move from the first position to the second position; when the external force disappears, the clamping head actuating part moves from the second position to the first position under the action of the restoring force of the spring.

22. A reservoir having a liquid level detection apparatus according to claim 21 wherein the portion of the bayonet joint actuator extending beyond the mounting is formed as a bayonet joint for securing the reservoir to the surface cleaning apparatus by snapping the bayonet joint into the housing of the surface cleaning apparatus.

23. The fluid reservoir having a fluid level detection apparatus of claim 22, wherein an upper surface of the card connector is formed to be inclined, and the upper surface of the card connector is inclined downward in a direction of mounting the fluid reservoir having a fluid level detection apparatus to the surface cleaning apparatus.

24. A liquid level detection apparatus as claimed in claim 1 wherein said tank body is formed with an inlet and outlet port on its upper wall for introducing a cleaning liquid into the interior of said tank body through said inlet and outlet port.

25. A reservoir having a fluid level sensing apparatus as defined in claim 24, further comprising:

26. The fluid reservoir having a fluid level detection apparatus of claim 25,

and the pivoting cover is provided with a hole so as to intake or exhaust air into or out of the box body through the hole of the pivoting cover.

27. A tank with a liquid level detection device according to claim 1, wherein the liquid level detection device comprises a capacitance liquid level meter and/or an electro-optical liquid level meter, which are arranged inside and/or outside the tank body, so as to detect the liquid level in the tank body through the capacitance liquid level meter and/or the electro-optical liquid level meter.

28. A reservoir having a liquid level detection apparatus as defined in claim 1, wherein said liquid level detection apparatus comprises:

a float including a float body and a magnetic portion;

29. The reservoir having a liquid level detection apparatus of claim 28, wherein each float body is provided with at least two magnetic portions, the at least two magnetic portions being disposed at different heights of the float body in a vertical direction.

30. The liquid storage tank having a liquid level detection apparatus according to claim 28, wherein the number of the floats is two or more, the number of the magnetic signal sensors is one more than the number of the floats, guide grooves are provided in the float guide part in the same number as the number of the floats, the respective floats are moved along the respective guide grooves based on a change in the liquid level by buoyancy of the liquid, and each magnetic signal sensor can be activated by only one float.

31. The liquid storage tank having a liquid level detection apparatus according to claim 28, wherein the number of the floats is two or more, the number of the magnetic signal sensors is one more than the number of the floats, a stopper portion one less than the number of the floats is provided on the float guide portion, each float moves along the float guide portion based on a change in the liquid level by buoyancy of the liquid, adjacent two floats are spaced by one stopper portion, and each magnetic signal sensor can be triggered by only one float.

32. A tank having a liquid level detection device according to claim 30 or 31 wherein the number of floats is two, an upper float and a lower float, and the number of magnetic signal sensors is three, an upper sensor, a middle sensor and a lower sensor, the upper and middle sensors being capable of being triggered by the upper float and the lower sensor being capable of being triggered by the lower float.

33. A tank having a liquid level detection apparatus according to claim 30 or 31 wherein the number of floats is two, an upper float and a lower float, and the number of magnetic signal sensors is three, an upper sensor, a middle sensor and a lower sensor, the upper sensor being capable of being triggered only by the upper float, the middle sensor and the lower sensor being capable of being triggered by the lower float.

34. The liquid level detection apparatus according to claim 28, wherein a second positioning groove is formed in a base of the case, and a lower end of the float guide is disposed in the second positioning groove.

35. A surface cleaning apparatus comprising a tank as claimed in any one of claims 1 to 34 having a liquid level detection means.

36. A surface cleaning apparatus as claimed in claim 35, characterised in that the reservoir with liquid level detection means is removably mounted to the body of the surface cleaning apparatus.

37. A surface cleaning apparatus as claimed in claim 35, characterised in that the reservoir with liquid level detection means is integrally formed with the body of the surface cleaning apparatus.