CN216797547U

CN216797547U - Surface cleaning device with supply liquid detection function

Info

Publication number: CN216797547U
Application number: CN202123346250.5U
Authority: CN
Inventors: 朱泽春; 崔卫民; 朱广; 张伟
Original assignee: Sharkninja China Technology Co Ltd
Current assignee: Sharkninja China Technology Co Ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-06-24
Anticipated expiration: 2031-12-28

Abstract

The utility model discloses a surface cleaning device with a liquid supply detection function, which belongs to the technical field of cleaning equipment and comprises a liquid storage tank and a liquid supply head which are connected through a pipeline, wherein the pipeline is provided with a detection module and a water pump, and the detection module comprises a light emitting tube and a light receiving tube so as to detect whether liquid flows through the pipeline or not. The detection module is arranged between the liquid storage tank and the water pump, and the distance between the detection module and the liquid storage tank is smaller than the distance between the detection module and the water pump. When the detection module detects that no liquid flows through the pipeline, the liquid still flows through the water pump, so that the water pump can stop running in time before the liquid in the pipeline flows out, the water pump is prevented from idling, the working performance of the water pump is ensured, and the service life of the machine body is prolonged.

Description

Surface cleaning device with supply liquid detection function

Technical Field

The utility model relates to the technical field of cleaning equipment, in particular to a surface cleaning device with a liquid supply detection function.

Background

In recent years, some intelligent cleaning devices are more and more widely applied to daily life, and various cleaning devices bring great convenience to the life of users. The floor cleaning machine is a common cleaning device, a cleaning roller and a motor for driving the cleaning roller are arranged on a cleaning head of the floor cleaning machine, and when the machine body works, the motor drives the cleaning roller to rotate so that the cleaning roller cleans a surface to be cleaned, so that the cleaning purpose is realized. Some floor mopping machines are provided with a liquid supply device consisting of a water tank, a spray head, a water pipe, a water pump and other components, liquid in the water tank can flow to the spray head through the water pipe and is sprayed out from the spray head under the action of the water pump, so that the cleaning roller can perform wet wiping on the ground, and the cleaning effect of the floor mopping machine is effectively improved. However, since the capacity of the water tank is limited, after the machine body works for a period of time or is used for a plurality of times, the liquid in the water tank is reduced, if the liquid supply device cannot supply liquid continuously, the cleaning effect is affected, and in addition, when no liquid exists in the water tank and the water pipe, the working performance of the water pump is also affected when the water pump idles.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects existing in the prior art, the utility model provides the surface cleaning device with the liquid supply detection function, so that the water pump can be stopped in time before liquid in a pipeline flows out, and the water pump is prevented from idling.

In order to achieve the technical purpose, the surface cleaning device with the liquid supply detection function comprises a liquid storage tank and a liquid supply head which are connected through a pipeline, wherein a detection module and a water pump are arranged on the pipeline, the detection module comprises a light emitting tube and a light receiving tube so as to detect whether liquid flows through the pipeline, the detection module is arranged between the liquid storage tank and the water pump, and the distance between the detection module and the liquid storage tank is smaller than the distance between the detection module and the water pump.

Preferably, the detection module comprises a detection pipeline and a liquid flow channel arranged at two ends of the detection pipeline, and the cross-sectional area of the detection pipeline and the cross-sectional area of the liquid flow channel at least partially overlap in projection in the liquid flow direction.

Preferably, the cross-sectional area of the detection conduit is less than the cross-sectional area of the flow channel.

Preferably, the detection module comprises a circuit board, the light emitting tube and the light receiving tube are arranged on the circuit board side by side, and the detection pipeline is provided with a transparent window so that the light emitting tube and the light receiving tube can detect liquid through the transparent window.

Preferably, be equipped with platform portion on the detection pipeline, platform portion department is located to transparent window, and transparent window is equipped with two and corresponds with light-emitting tube, light-receiving tube respectively.

Preferably, the detection pipeline opposite to the transparent window is made of black plastic.

Preferably, the pipeline includes transparent section at least, is equipped with the passageway that is used for installing transparent section on the detection module, and the both sides of passageway and relative setting are located to the phototube and light receiving tube.

Preferably, the central connecting line of the light emitting tube and the light receiving tube is arranged at an acute angle or an obtuse angle with the liquid flow direction.

Preferably, the channel is in a groove shape with one side open, so that the transparent section is clamped and embedded in the channel.

Preferably, the detection module is disposed at an inclination such that the light emitting tube is located at a bottom side of the flowing liquid.

After the technical scheme is adopted, the utility model has the following advantages:

1. the surface cleaning device provided by the utility model is characterized in that a detection module and a water pump are additionally arranged on a pipeline connecting a liquid storage tank and a liquid supply head, light emitted by a light emitting tube can be received by a light receiving tube under the action of liquid in the pipeline, the light emitted by the light emitting tube cannot be received by the light receiving tube when no liquid flows through the pipeline, and the detection module confirms whether liquid flows through the pipeline or not through the matching of the light emitting tube and the light receiving tube, so that the purpose of liquid supply detection is realized. The detection module is arranged between the liquid storage tank and the water pump, the distance between the detection module and the liquid storage tank is smaller than the distance between the detection module and the water pump, when the detection module detects that no liquid flows through the pipeline, the liquid still flows through the water pump, so that the water pump can be stopped in time before the liquid in the pipeline flows out, the idle running condition of the water pump is avoided, the working performance of the water pump is ensured, and the service life of the machine body is prolonged.

2. The cross-sectional area of the detection pipeline and the projection of the cross-sectional area of the liquid flow channel in the liquid flowing direction are at least partially overlapped, so that liquid in the pipeline can smoothly flow into the detection pipeline through the liquid flow channel, bubbles are prevented from being generated in the detection pipeline, and the detection accuracy of the detection module is improved.

3. The cross-sectional area of the detection pipeline is preferably smaller than that of the liquid flow channel, so that liquid flowing through the detection pipeline is in a full flow state as much as possible, the effect of the liquid in the detection pipeline on light emitted by the light emitting tube is favorably improved, and the detection effect of the detection module is favorably improved.

4. On the circuit board was located side by side to phototube and light-receiving tube, set up transparent window on the detection pipeline, during the light that the phototube sent can jeted into the detection pipeline through transparent window, the light through liquid reflection can be received by the phototube through transparent window, rationally sets up the cooperation mode between detection module and the detection pipeline, makes detection module satisfy whether have the operating requirement that liquid flowed through in the detection pipeline.

5. Transparent window locates the platform portion department on the detection pipeline, and transparent window is preferred to be set up two and correspond the setting with light-emitting tube, light-receiving tube respectively, rationally sets up transparent window set up position and quantity, is favorable to reducing transparent window's the degree of difficulty that sets up, also is favorable to improving the cooperation stability between light-emitting tube and the light-receiving tube.

6. The detection pipeline that corresponds with transparent window preferably adopts black plastics to make, and the detection pipeline inner wall that corresponds with transparent window promptly is the black, makes the inner wall of detection pipeline not reflect the light that the emission of light pipe sent as far as possible, guarantees that the received light of light receiver tube is caused by the liquid reflection in the detection pipeline as far as possible, is favorable to improving detection module's detection accuracy.

7. The light emitting tube and the light receiving tube can also be arranged on two sides of a channel for installing the transparent section, the central connecting line of the light emitting tube and the light receiving tube and the liquid flow direction in the transparent section are preferably arranged in an acute angle or an obtuse angle, and at the moment, the light emitted by the light emitting tube is received by the light receiving tube after being refracted by the liquid in the transparent section. The matching mode between the detection module and the transparent section pipeline is reasonably set, so that the detection module meets the working requirement of whether liquid flows through the detection pipeline or not.

8. The passageway is the open slot-like in one side, and transparent section can be from open side inlay card in the passageway, rationally sets up the concrete structure of passageway, is favorable to reducing the cooperation degree of difficulty between transparent section and the passageway, is favorable to improving the packaging efficiency.

9. The detection module is obliquely arranged, so that the light emitting tube is positioned at the bottom side of the flowing liquid, the light emitted by the light emitting tube is ensured to be received by the light receiving tube under the action of the liquid when the liquid flow is smaller, and the detection accuracy of the detection module is favorably improved.

Drawings

FIG. 1 is a perspective view of a surface cleaning apparatus according to an embodiment;

FIG. 2 is a view showing the internal structure of a head of a surface cleaning apparatus according to an embodiment;

FIG. 3 is a simplified diagram of a control board, a detection module, and a water pump of a surface cleaning apparatus according to an embodiment;

FIG. 4 is a block diagram of a detection module in a surface cleaning apparatus according to an embodiment;

FIG. 5 is a partial block diagram of a detection module of a surface cleaning apparatus according to one embodiment;

FIG. 6 is a schematic view of the liquid storage tank and the liquid supply head of a surface cleaning apparatus according to an embodiment;

FIG. 7 is a view of a detection module in a surface cleaning apparatus in accordance with an embodiment in combination with a fluid flow channel;

FIG. 8 is a cross-sectional view of a fluid delivery head of a surface cleaning apparatus according to an embodiment;

FIG. 9 is a schematic view of a cover plate of a liquid supply head in a surface cleaning apparatus according to an embodiment;

FIG. 10 is a block diagram of a detection module of a surface cleaning apparatus according to an embodiment;

FIG. 11 is an exploded view of a first detection module of the second surface cleaning apparatus of the embodiment;

FIG. 12 is an exploded view of a second detection module of the second surface cleaning apparatus of the embodiment;

FIG. 13 is a view of the detection module and transparent segment of a surface cleaning apparatus according to an embodiment.

In the figure, 10-machine body, 20-machine head, 110-liquid storage tank, 120-liquid supply head, 121-cover plate, 122-back plate, 123-connector, 124-spray head, 125-spray hole, 126-water channel, 130-pipeline, 131-liquid channel, 132-transparent section, 140-detection module, 141-light emitting tube, 142-light receiving tube, 143-circuit board, 144-detection pipeline, 145-platform part, 146-transparent window, 147-shell, 1471-slot, 148-cover shell, 1481-channel, 149-detection seat, 1491-seat body, 1492-seat cover, 1493-groove, 1494-spacing rib, 1495-through groove, 1496-clamping groove, 150-water pump, 210-cleaning roller, 220-motor, 230-transmission mechanism, 300-control board, 400-handle.

Detailed Description

The utility model is further described with reference to the following figures and specific examples. It is to be understood that the following terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," "bottom," and the like are used merely to indicate an orientation or positional relationship relative to one another as illustrated in the drawings, merely to facilitate describing and simplifying the utility model, and are not intended to indicate or imply that the device/component so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore are not to be considered limiting of the utility model.

Example one

As shown in fig. 1 to 9, a surface cleaning apparatus with a liquid supply detection function according to a first embodiment of the present invention includes a liquid storage tank 110 and a liquid supply head 120 connected by a pipeline 130, the pipeline 130 is provided with a detection module 140 and a water pump 150, the detection module 140 includes a light emitting tube 141 and a light receiving tube 142 to detect whether liquid flows through the pipeline 130. The detection module 140 is disposed between the liquid storage tank 110 and the water pump 150, and a distance between the detection module 140 and the liquid storage tank 110 is smaller than a distance between the detection module 140 and the water pump 150.

In the embodiment, the hand-held surface cleaning device shown in fig. 1 is taken as an example, the surface cleaning device includes a body 10 and a head 20 pivotally connected to a bottom end of the body 10, the head 20 can rotate up and down relative to the body 10 by a certain angle, and a liquid storage tank 110 is detachably disposed at a rear side of the body 10. The front side of the machine head 20 is provided with the cleaning roller 210 which is axially arranged along the left-right direction and can rotate, the machine head 20 is internally provided with a motor 220 and a transmission mechanism 230 which are used for driving the cleaning roller 210 to rotate, the motor 220 drives the cleaning roller 210 to rotate through the transmission mechanism 230, and the surface to be cleaned is wiped, so that the cleaning purpose is realized. The liquid supply head 120 is arranged in the machine head 20 and is positioned at the rear side of the cleaning roller 210, and the liquid supply head 120 sprays liquid onto the cleaning roller 210, so that the cleaning roller 210 can wet and wipe a surface to be cleaned, and the wiping effect is improved. A control board 300 is provided in the body 10, and the motor 220 is controlled by the control board 300. The top of the body 10 is provided with a handle 400, the control panel 300 is preferably disposed in the handle 400, and the handle 400 is provided with buttons corresponding to the control panel 300.

Referring to fig. 4, the detecting module 140 includes a circuit board 143, and the light emitting tube 141 and the light receiving tube 142 are spaced apart from each other on the circuit board 143. The circuit board 143 of the detection module 140 is connected to the control board 300 through a signal line, the water pump 150 is also connected to the control board 300 through a signal line, and the control board 300 can control the operation of the water pump 150 according to a signal fed back by the detection module 140.

The detection module 140 includes a detection pipe 144, a platform 145 is disposed on the detection pipe 144, and a transparent window 146 is disposed at the platform 145 to allow the light emitting tube 141 and the light receiving tube 142 to detect the liquid through the transparent window 146. In this embodiment, two transparent windows 146 are provided and respectively correspond to the light emitting tube 141 and the light receiving tube 142, light emitted from the light emitting tube 141 enters the detection tube 144 through the corresponding transparent windows 146, when liquid flows through the detection tube 144, the light is emitted through the transparent windows 146 corresponding to the light receiving tube 142 under the reflection action of the liquid in the detection tube 144 and received by the light receiving tube 142, and the control board 300 determines that the liquid flows through the pipeline 130 according to the detection signal fed back by the detection module 140. When no liquid flows through the detection pipe 144, the light emitted into the detection pipe 144 cannot be received by the light receiving pipe 142 through the reflection of the liquid, the control board 300 determines that no liquid flows through the pipeline 130 according to the detection signal fed back by the detection module 140, that is, no liquid is available in the liquid storage tank 110, and the control board 300 instructs the water pump 150 to stop operating according to the determination, so as to avoid the water pump 150 from idling.

In order to improve the detection accuracy of the detection module 140 when no liquid flows through the detection pipe 144, at least the portion of the detection pipe 144 opposite to the transparent window 146 is made of black plastic, that is, the inner wall of the detection pipe 144 corresponding to the transparent window 146 is black, so that the inner wall of the detection pipe 144 does not reflect the light emitted from the light emitting tube 141 as much as possible, and the light received by the light receiving tube 142 is ensured to be caused by the reflection of the liquid in the detection pipe 144 as much as possible. In this embodiment, the detection pipeline 144 has an integrated structure, and the detection pipeline 144 is made of black plastic.

In order to fix the circuit board 143, a transparent casing 147 is fixed to the platform portion 145, the casing 147 is provided with a slot 1471 into which the circuit board 143 is inserted, and the circuit board 143 is inserted into the slot 1471 and sealed with a sealant.

In this embodiment, the pipeline 130 is a multi-section structure, and the liquid storage tank 110, the detection module 140, the water pump 150 and the liquid supply head 120 are connected in series by the pipeline 130. The distance between the detection module 140 and the liquid storage tank 110 is smaller than the distance between the detection module 140 and the water pump 150, and specifically, the length between the detection module 140 and the liquid storage tank 110 in the pipeline 130 is smaller than the length between the detection module 140 and the water pump 150 in the pipeline 130.

Referring to fig. 7, the pipe 130 is provided with a fluid channel 131 at both ends of the detection pipe 144 and communicating with the cavity of the detection pipe 144. To avoid that the generation of bubbles in the detection conduit 144 affects the accuracy of the detection, the cross-sectional area of the detection conduit 144 at least partially overlaps the projection of the cross-sectional area of the flow channel 131 in the liquid flow direction. In this embodiment, in order to keep the liquid in the detection pipe 144 in a full flow state as much as possible, the cross-sectional area of the detection pipe 144 is set to be smaller than the cross-sectional area of the flow channel 131, and the cross-sectional area of the detection pipe 144 and the cross-sectional area of the flow channel 131 are preferably set to completely overlap in the liquid flow direction.

Referring to fig. 6 and 7, in order to improve the detection accuracy of the detection module 140, the detection module 140 is disposed obliquely such that the light emitting tube 141 is located at the bottom side of the flowing liquid in the detection pipe 144, so as to ensure that the light emitted from the light emitting tube 141 can be received by the light receiving tube 142 after being reflected by the liquid even when the flow rate of the liquid in the detection pipe 144 is small. In this embodiment, the detection module 140 is preferably fixed inside the body 10, and the inclination angle of the detection module 140 with respect to the horizontal direction is α, and α is preferably set to 45 °.

Referring to fig. 8 and 9, the liquid supply head 120 includes a cover plate 121 and a back plate 122 fixed together, a connector 123 sleeved with the end of the pipeline 130 is disposed on the back surface of the back plate 122, a plurality of nozzles 124 are disposed on the front surface of the cover plate 121 and spaced apart from each other in the left-right direction and facing the cleaning roller 210, nozzle holes 125 are disposed on the nozzles 124, a water channel 126 for communicating the pipeline 130 with the nozzle holes 125 is formed between the cover plate 121 and the back plate 122, and the liquid flowing into the liquid supply head 120 flows to the nozzles 124 through the water channel 126 and is sprayed onto the cleaning roller 210 from the nozzle holes 125 at the nozzle holes 124.

When the machine body works, the water pump 150 runs intermittently, water in the liquid storage tank 110 can flow to the liquid supply head 120 through the pipeline 130 under the action of the water pump 150, and liquid flowing into the liquid supply head 120 is sprayed to the cleaning roller 210 through the spray holes 125 to wet the cleaning roller 210, so that the cleaning roller 210 can wet the surface to be cleaned, and the cleaning effect is improved. The detection module 140 detects whether liquid flows through the detection pipeline 144, and when no liquid flows through the detection pipeline 144, the control board 300 instructs the water pump 150 to stop working according to a signal fed back by the detection module 140, so as to prevent the water pump 150 from idling.

In order to remind the user to add liquid into the liquid storage tank 110 in time, the control panel 300 is in signal connection with a prompting module, when the control panel 300 judges that no liquid flows through the detection pipeline 144 according to a signal command fed back by the detection module 140, the control panel 300 commands the prompting module to prompt the user to add liquid.

It will be appreciated that other configurations of the surface cleaning apparatus are referred to in the art.

It will be appreciated that the improved structure of the present embodiment is not only suitable for use with the hand-held surface cleaning apparatus described above and shown in the drawings, but is also suitable for use with self-propelled surface cleaning apparatus, such as cleaning robots and the like.

It is understood that the detection pipe 144 may also be formed by separate molding and then assembled together, in which case, only the portion of the detection pipe 144 corresponding to the transparent window 146 may be made of black plastic.

It is understood that the cross-sectional area of the detection conduit 144 and the cross-sectional area of the liquid flow channel 131 may also be only partially overlapped in the liquid flow direction, and the overlapping area may be set to a reasonable ratio of 30%, 40%, 50%, 60%, 70%, 80%, 90%, etc. of the cross-sectional area of the detection conduit 144.

It will be appreciated that the cross-sectional area of the detection conduit 144 and the cross-sectional area of the flow channel 131 may be of equal size.

It can be understood that the inclination angle α of the detection module 140 with respect to the horizontal direction may also be set to other reasonable angle values such as 30 °, 35 °, 40 °, 44 °, 46 °, 50 °, 55 °, 60 °, and so on.

It will be appreciated that the specific configuration of the liquid supply head 120 is not limited to that described above and shown in the drawings, and that other suitable configurations may be used, such as a spray head 124 connected directly to the conduit 130.

It will be appreciated that the liquid supply head 120 may also spray liquid onto the surface to be cleaned in front of the head 20.

It is to be understood that the specific number of the cleaning rollers 210 is not limited to one as described above and shown in the drawings, and two cleaning rollers may be provided at intervals in the front-rear direction.

It is understood that a liquid spraying button may be added to the handle 400, and when liquid is required to be sprayed, a user presses the liquid spraying button to spray the liquid through the liquid supply head 120.

It is understood that the detection module 140 may also be provided inside the handpiece 20.

Example two

Referring to fig. 10, 11, 12, and 13, the pipeline 130 at least includes a transparent section 132, a channel 1481 for installing the transparent section 132 is disposed on the detection module 140, and the light emitting tube 141 and the light receiving tube 142 are disposed on two sides of the channel 1481 and are disposed opposite to each other.

In this embodiment, the detection module 140 includes the detection seat 149, the detection seat 149 includes a seat body 1491 and a seat cover 1492 fixed together, a groove 1493 is formed on a side of the seat body 1491 facing away from the seat cover 1492, a transparent cover 148 is embedded in the groove 1493, and a channel 1481 is formed by the cover 148. To facilitate installation of the transparent segment 132 in the channel 1481, the housing 148 is in the form of an arcuate shell, such that the side of the channel 1481 facing away from the seat cover 1492 is open, and the transparent segment 132 is installed into the channel 1481 from the open side of the housing 148. In order to improve the stability of the transparent section 132, the base 1491 is provided with two slots 1496 at two ends of the channel 1481, and two ends of the transparent section 132 are clamped in the slots 1496.

In this embodiment, the circuit board 143 is concave, the light emitting tube 141 and the light receiving tube 142 are respectively located on two legs of the circuit board 143, the circuit board 143 is inserted into the seat body 1491, the inside of the seat body 1491 is provided with a limiting rib 1494 for limiting the circuit board 143, the seat body 1491 is provided with through grooves 1495 which are respectively located on two sides of the housing 148 and respectively correspond to the light emitting tube 141 and the light receiving tube 142, light emitted from the light emitting tube 141 is emitted into the transparent section 132 through the through grooves 1495 and the housing 148, and the light is received by the light receiving tube 142 after being refracted by liquid in the transparent section 132.

In order to make the light receiving tube 142 smoothly receive the light refracted by the liquid, the central connecting line of the light emitting tube 141 and the light receiving tube 142 is arranged at an acute angle or an obtuse angle with the flow direction of the liquid. Referring to fig. 13, the direction indicated by the arrow is the flow direction of the liquid in the transparent segment 132, the straight line L indicates the central line between the light emitting tube 141 and the light receiving tube 142, and the straight line L forms an angle β with the flow direction of the liquid, and β is preferably set to 55 °.

The other structures of the second embodiment are the same as those of the first embodiment, and are not described in detail here.

It is understood that β may also be set to other reasonable angle values of 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 54 °, 60 °, 65 °, 70 °, 75 °, 80 °, 85 °, 95 °, 105 °, 110 °, 115 °, 120 °, 125 °, 130 °, 135 °, 140 °, 145 °, 150 °, and so on.

It will be appreciated that the detection module 140 is preferably disposed at an angle such that the light emitting tube 141 is located at the bottom side of the flowing liquid in the transparent section 132.

It will be appreciated that the portion of the conduit 130 other than the transparent segment 132 may be configured as a non-transparent tube, in which case the inner diameter of the transparent segment 132 is preferably configured to be smaller than the inner diameter of the other tube segments.

It is understood that the entire pipe 130 may be a transparent pipe.

Other embodiments of the present invention than the preferred embodiments described above, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, should fall within the scope of the present invention defined in the claims.

Claims

1. The utility model provides a surface cleaning device with supply liquid detection function, includes liquid reserve tank and the confession liquid head through the tube coupling, is equipped with detection module and water pump on the pipeline, and detection module includes that light-emitting tube and light-receiving tube have liquid to flow through in order to detect the pipeline, its characterized in that, detection module locates between liquid reserve tank and the water pump, and the distance between detection module and the liquid reserve tank is less than the distance between detection module and the water pump.

2. The surface cleaning device with the liquid supply detection function of claim 1, wherein the detection module comprises a detection pipeline and liquid flow channels arranged at two ends of the detection pipeline, and the cross-sectional area of the detection pipeline and the cross-sectional area of the liquid flow channel at least partially overlap in projection in the liquid flow direction.

3. A surface cleaning apparatus having a liquid supply detection function as claimed in claim 2, wherein the detection conduit has a cross-sectional area smaller than that of the liquid flow passage.

4. The surface cleaning apparatus with a liquid supply detection function of claim 1, wherein the detection module comprises a circuit board, the light emitting tube and the light receiving tube are arranged side by side on the circuit board, and the detection pipeline is provided with a transparent window so that the light emitting tube and the light receiving tube can detect liquid through the transparent window.

5. The surface cleaning apparatus with a liquid supply detection function as claimed in claim 4, wherein a platform is provided on the detection pipe, a transparent window is provided at the platform, and two transparent windows are provided and correspond to the light emitting tube and the light receiving tube, respectively.

6. A surface cleaning apparatus with liquid supply detection as claimed in claim 4, wherein the detection conduit opposite the transparent window is made of black plastic.

7. The surface cleaning device with the liquid supply detection function of claim 1, wherein the pipeline at least comprises a transparent section, the detection module is provided with a channel for installing the transparent section, and the light emitting tube and the light receiving tube are arranged on two sides of the channel and are arranged oppositely.

8. The surface cleaning apparatus with a liquid supply detection function as claimed in claim 7, wherein a central connecting line of the light emitting tube and the light receiving tube is arranged at an acute angle or an obtuse angle with a liquid flow direction.

9. The surface cleaning apparatus with a liquid supply detection function as claimed in claim 7, wherein the channel is in a groove shape with one side open so that the transparent section is embedded in the channel.

10. The surface cleaning apparatus with a liquid supply detection function according to any one of claims 1 to 9, wherein the detection module is disposed obliquely so that the light emitting tube is located at the bottom side of the flowing liquid.