CN113133724A

CN113133724A - Floor cleaning machine

Info

Publication number: CN113133724A
Application number: CN202110410930.4A
Authority: CN
Inventors: 杨勇
Original assignee: Shenzhen 3irobotix Co Ltd
Current assignee: Shenzhen 3irobotix Co Ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2021-07-20

Abstract

A floor scrubber, comprising: a cleaning seat part provided with a cleaning roller; a body; a handle assembly; the recovery box body is arranged on the body; a suction assembly for creating a negative pressure; the liquid level detection sensor is arranged on the body, a light transmission part is arranged on the recovery box body and is opposite to the liquid level detection sensor, the light transmission part is provided with a light transmission channel which extends into the recovery box body and is used for transmitting light signals, when the light transmission part is in a liquid environment, the liquid level detection sensor outputs a first signal, and when the light transmission part is in an air environment, the liquid level detection sensor outputs a second signal; and the alarm device receives the first signal and responds to the first signal to send out an early warning signal so as to warn that the liquid in the recovery box body reaches a warning height. The application provides a retrieve the subassembly can in time send early warning signal under the condition that liquid reaches warning height in the recovery box, remind the user in time to fall liquid, clearance recovery box to can continue normal use.

Description

Floor cleaning machine

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of cleaning, in particular to a floor washing machine.

[ background of the invention ]

The floor washing machine is increasingly popular with the majority of users as a cleaning household appliance, and particularly, the wireless floor washing machine product is popular with the users because the wireless floor washing machine product is powered by a battery and is not bound by a power line when in use.

Floor washers appearing in the market all possess the sewage recycling bin, and dirty water that the clean in-process was wiped the ground all can be collected in the recycling bin and avoid secondary pollution. When sewage recovery bucket solution reached the upper limit, how to protect the machine and the suggestion user in time emptys sewage recovery bucket, the main race article on the market realized through the float structure in the recovery bucket at present, and when the liquid level rose to the upper limit in the recovery bucket, the float floated along with the liquid level because of buoyancy until blockking up the suction inlet, and the suction inlet was stifled state entirely this moment, and no negative pressure can not inhale sewage in the recovery bucket again.

Although recycling bin float structure application is comparatively general, nevertheless there is certain probability float jamming phenomenon can appear, inside sewage was inhaled motor and machine easily this moment, the air outlet spouts the sewage phenomenon still can appear simultaneously, brings not good clean experience for the user.

Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

[ summary of the invention ]

The invention aims to provide a floor washing machine which can remind a user of dumping sewage in time when the sewage reaches a warning state and prevent the sewage from being sucked into a motor and the machine after the sewage is over-full.

The purpose of the invention is realized by the following technical scheme:

a floor scrubber, comprising:

a cleaning seat including a cleaning roller for mopping a floor;

the body is arranged above the cleaning seat part and is movably connected with the cleaning seat part;

the handle assembly is connected to the body and used for being held by a user;

the recovery box body is arranged on the body, is communicated with the cleaning seat part and is used for recovering the cleaned sewage;

the suction assembly is arranged on the body and used for forming negative pressure so as to recover the sewage collected by the cleaning roller to the recovery box body;

the liquid level detection sensor is arranged on the body, a light transmission part is arranged on the recovery box body and is opposite to the liquid level detection sensor, the light transmission part is provided with a light transmission channel which extends into the recovery box body and is used for transmitting light signals, when the light transmission part is in a liquid environment, the liquid level detection sensor outputs a first signal, and when the light transmission part is in an air environment, the liquid level detection sensor outputs a second signal;

and the alarm device is electrically connected with the liquid level detection sensor, receives the first signal and responds to the first signal to send out an early warning signal so as to warn that the liquid in the recovery box body reaches a warning height.

In one embodiment, the liquid level detection sensor comprises a light emitting unit and a light receiving unit, the light transmitting part comprises a reflecting structure facing the light transmitting channel, and the light emitting unit and the light receiving unit are arranged on the same side of the reflecting structure;

when the reflecting structure is in a liquid environment, the optical signal sent by the light emitting unit is refracted out to the other side of the reflecting structure, the light receiving unit does not receive the optical signal, and the liquid level detection sensor outputs the first signal;

when the reflection structure is located in an air environment, the reflection structure reflects the optical signal sent by the light emitting unit to the light receiving unit, the light receiving unit receives the optical signal, and the liquid level detection sensor outputs the second signal.

In one embodiment, the recovery box body is provided with a liquid inlet and a liquid recovery channel communicated with the liquid inlet, the liquid inlet is positioned at the bottom of the recovery box body, the liquid recovery channel is positioned at the downstream of the liquid inlet and is used for conveying recovered liquid, the liquid recovery channel comprises a first end close to the liquid inlet and a second end opposite to the first end, the second end is higher than the first end in the water level lifting direction, and the reflection structure is lower than the second end.

In one embodiment, the light emitting unit is an infrared emitting unit, the light receiving unit is an infrared receiving unit, and the optical signal is an infrared optical signal.

In one embodiment, the reflective structure includes a first reflective surface and a second reflective surface, and the first reflective surface and the second reflective surface are disposed at an angle, where the angle is greater than 0 ° and smaller than 180 °.

In one embodiment, the first reflective surface and the second reflective surface are disposed at substantially 90 °.

In one embodiment, the first reflective surface is disposed at an angle of 45 ° with respect to the light direction of the light emitting unit 421.

In one embodiment, the second reflecting surface and the light receiving unit are arranged at 45 degrees in light direction.

In one embodiment, the recycling box body comprises a collecting box body and an upper cover used for closing the collecting box body, and the light transmission part is installed on the upper cover and extends into the collecting box body.

In one embodiment, the alarm device comprises one or more of a reminding lamp, a buzzer, a display screen for displaying the early warning signal and a voice player for playing the early warning signal.

Compared with the prior art, the invention has the following beneficial effects: the application provides a scrubber is through setting up the full detection sensor of liquid and discerning whether liquid reaches the early warning height in the recovery box to liquid sends early warning signal by alarm device under the condition that reaches the early warning height in the recovery box, reminds the user in time to fall liquid, clears up the recovery box, so that can continue normal use, and avoid inside sewage is sucked into motor and machine after being too full.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

FIG. 1 is a schematic cross-sectional view of an angle of a scrubber according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the scrubber of the embodiment of FIG. 1 at another angle, wherein the body is tilted.

FIG. 3 is a schematic view of the structure of the recovery tank of the scrubber of FIG. 1 with the liquid level below the light transmitting portion.

FIG. 4 is a schematic view of the structure of the light transmitting unit of the floor washing machine of FIG. 1, wherein the liquid level in the recovery tank is over.

FIG. 5 is a schematic diagram of the electro-optical principle of the scrubber of the embodiment of FIG. 1 in a non-water full condition.

FIG. 6 is a photoelectric schematic of the embodiment of FIG. 1 when the scrubber is full.

[ detailed description ] embodiments

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," as well as any variations thereof, in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1 and 2, the present application provides a scrubber 100 including a body 10, a handle assembly 12, a recovery assembly, and a cleaning seat 30. Wherein the handle assembly 12 is configured to be manipulated and held by a user. The handle assembly 12 is connected to the cleaning seat 30, and a user grips the handle assembly 12 to manipulate the cleaning seat 30 to perform a cleaning task on the floor. The cleaning seat 30 includes therein a cleaning roller 301 for collecting dirt.

Referring to fig. 1 and 2, the recycling assembly includes a recycling box 41, a liquid level detecting sensor 42, and an alarm device. In this embodiment, the recovery tank 41 is applied to the scrubber 100. The recovery tank 41 is embodied as a sump tank of the scrubber machine for storing the collected dirty liquid. The recovery tank 41 is provided in the body 10, and the recovery tank 41 stores the collected contaminated fluid. The recovery tank 41 is connected to the cleaning seat 30 through a fluid line (not shown) to transfer the fluid in the recovery tank 41 to the cleaning seat 30, thereby facilitating the cleaning seat 30 to clean the floor. The recovery tank 41 is installed on the body 10, and the recovery tank 41 communicates with the cleaning seat portion 30 for recovering the sewage.

Referring to fig. 1 and 2, the body 10 includes a clean water tub 50 and a suction assembly 20. The cleaning water tank 50 is used for storing cleaning liquid, which may be clean water or cleaning liquid. The suction assembly 20 is used to create a negative pressure to draw the sewage on the ground into the recovery tank 41. In a particular embodiment, the suction assembly 20 includes a motor (not shown) and an impeller (not shown), the motor driving the impeller to rotate to generate the negative pressure. Further, in order to improve the portability of the scrubber 100, the battery pack 60 is used for supplying power, and referring to fig. 1, the battery pack 60 is disposed in the body 10 and electrically connected to the motor to provide power for the operation of the motor.

In this embodiment, referring to fig. 1 and 2, the body 10 is connected above the cleaning seat 30, the handle assembly 12 is connected to the body 10, the body 10 and the handle assembly 12 are connected to the cleaning seat 30 as a whole, and the user holds the handle assembly 12 and manipulates the body 10 and the cleaning seat 30 during a washing operation. In this embodiment, the body 10 extends lengthwise, the handle assembly 12 is connected to the upper end of the body 10, the cleaning seat 30 is connected to the lower end of the body 10, and the body 10 and the cleaning seat 30 are rotatably disposed through the adapter 15, so that the handle assembly 12 and the body 10 can rotate relative to the cleaning seat 30, thereby changing the operation angle and flexibly adjusting the cleaning posture.

Referring to fig. 1 and 2, a recycling tank 41 is used for containing recycled liquid. The recovery tank 41 has a liquid inlet 411, a liquid recovery passage 412 communicating with the liquid inlet 411, and a collection chamber 413 located outside the liquid recovery passage 412 and partitioned from the liquid recovery passage 412. A liquid inlet 411 is located at the bottom of the recovery tank 41, and a liquid recovery channel 412 is located downstream of the liquid inlet 411 and is used to convey the recovered liquid. The recovered liquid enters the recovery tank 41 through the liquid inlet 411, passes through the liquid recovery channel 412, and falls into the collection chamber 413 for storage.

Referring to fig. 2, the recovery tank 41 is provided with a light transmitting portion 44 positioned opposite the full liquid level detection sensor 42. The light transmission part 44 is provided with a light transmission channel which extends into the recovery box body 41 and is used for transmitting light signals, when the light transmission part 44 is in a liquid environment, the liquid level detection sensor 42 outputs a first signal, and when the light transmission part 44 is in an air environment, the liquid level detection sensor 42 outputs a second signal; and the alarm device is electrically connected with the liquid level detection sensor 42 and receives the first signal and responds to the first signal to send out an early warning signal so as to warn that the liquid in the recovery box body 41 reaches a warning height.

Referring to fig. 2, the liquid level detection sensor 42 is disposed on the body 10. In one embodiment, referring to fig. 5 to 6, the full liquid detection sensor 42 uses a light detection sensor, and detects whether the full liquid detection sensor 42 is full by using the principle of light emission and refraction. The light propagation paths are shown by hollow arrows in fig. 5 and 6. Specifically, the liquid level detection sensor 42 includes a light emitting unit 421 and a light receiving unit 422, and the light transmitting portion 44 includes a reflection structure (423, 424) that is a positive light transmission channel. In the present embodiment, the light emitting unit 421 and the light receiving unit 422 are disposed on the same side of the reflection structure (423, 424). When the reflective structure is in a liquid environment, the optical signal emitted by the light emitting unit 421 is refracted out to the other side of the reflective structure, the light receiving unit 422 does not receive the optical signal, and the liquid level detection sensor 42 outputs the first signal; when the reflective structure is in an air environment, the reflective structure reflects the optical signal emitted from the light emitting unit 421 to the light receiving unit 422, the light receiving unit 422 receives the optical signal, and the liquid level detection sensor 42 outputs the second signal.

The scrubber of the embodiment of fig. 2 is characterized in that the liquid level detection sensor 42 is arranged on the body 10, the reflection structure extends into the recovery box 41 through the light transmission part 44, the liquid level detection sensor 42 is directly embedded or mounted on the body 10, the liquid level detection sensor 42 is directly connected with a circuit, and the circuit is not indirectly connected (the indirect connection refers to connection through a contact piece or a contact), so that the circuit connection fixity and stability of the liquid level detection sensor 42 are ensured, the liquid level detection sensor 42 does not need to be taken out, and the situation of poor electrical contact of the liquid level detection sensor 42 cannot occur.

In the scrubber of the embodiment of fig. 2, the reflective structure (423, 424) is disposed at the extended end of the light transmitting portion 44, and the liquid level detection sensor 42 outputs a first signal when the reflective structure (423, 424) is in a liquid environment, and the liquid level detection sensor 42 outputs a second signal when the reflective structure (423, 424) is in an air environment. Of course, in other embodiments, the reflective structures (423, 424) may be disposed in the middle of the light transmission part 44 or above or below the light transmission part, and the position of the reflective structures (423, 424) may be selected according to the size of the light transmission part 44.

Fig. 5 shows a schematic diagram of the light propagation path of the reflective structure (423, 424) in an air environment. In the embodiment shown in fig. 5, the light signal emitted from the light emitting unit 421 is reflected by the reflecting structure (423, 424) and transmitted to the light receiving unit 422, the light receiving unit 422 receives the light signal emitted from the light emitting unit 421, the signal output by the full liquid detection sensor 42 is the second signal, it is recognized that the full liquid detection sensor 42 is in the air environment, and the liquid in the recovery tank 41 is not full. Since the full liquid detection sensor 42 emits the second signal, the warning device does not emit a warning signal. Fig. 6 shows a schematic diagram of the propagation of the optical signal of the reflective structure (423, 424) when the reflective structure (423, 424) is full, the optical signal emitted by the light emitting unit 421 is refracted through the reflective structure 423 and outwards, the optical signal is not received by the light receiving unit 422, and at this time, the full detection sensor 42 outputs the first signal. The alarm device sends out a liquid full early warning signal.

Specifically, the light emitting unit 421 is an infrared emitting unit for emitting an infrared light signal. The light receiving unit 422 is an infrared receiving unit for receiving an infrared light signal. That is, both the light signal transmitted/received by the light transmitting unit 421 and the light receiving unit 422 are infrared light signals.

The reflection structure includes a first reflection surface 423 and a second reflection surface 424, the first reflection surface 423 is disposed at an angle of 45 degrees with respect to the light direction of the light emitting unit 421, and the second reflection surface 424 is disposed at an angle with respect to the first reflection surface 423, the angle being greater than 0 degree and smaller than 180 degrees. In this embodiment, the first reflecting surface 423 and the second reflecting surface 424 are disposed at substantially 90 °, and the cross-sections of the first reflecting surface 423 and the second reflecting surface 424 are V-shaped. In one embodiment, the angle can better reflect the light signal, so as to ensure that the most light is reflected back to be received by the light receiving unit 422, and to ensure the stability of signal detection of the liquid level detection sensor 42 to the greatest extent.

In another embodiment, the light emitting unit 421 and the light receiving unit 422 are respectively disposed at both sides of the reflective structure. This embodiment differs from the above-described embodiment only in the liquid level detection sensor, and for the sake of brevity, only the differences will be described. When the liquid level detection sensor is in a liquid environment, the light signal emitted by the light emitting unit 421 is refracted to the other side of the reflecting structure (423, 424) through refraction and received by the light receiving unit 422, the signal emitted by the liquid level detection sensor is a first signal, the liquid level detection sensor 42 is identified to be in the liquid level environment, the recovery box body 41 is full of liquid, the alarm device receives the first signal, and an early warning signal is emitted in response to the first signal to remind a user of pouring liquid. When the liquid level detection sensor is in an air environment, the light signal emitted by the light emitting unit 421 is reflected by the reflecting

structures

423 and 424, and is not transmitted to the other side of the reflecting structure, so that the light receiving unit 422 cannot receive the light signal emitted by the light emitting unit 421, the signal output by the liquid level detection sensor 42 is a second signal, and the alarm device receives the second signal and does not respond to the emission of the early warning signal.

Referring to fig. 1, the liquid recycling channel 412 includes a first end 414 near the liquid inlet 411 and a second end 415 opposite to the first end 414, the second end 415 is higher than the first end 414 in the water level ascending and descending direction, and the reflective structure is lower than the second end 415. Through setting up reflective structure to be less than second end 415, when the liquid level of the liquid that collects chamber 413 did not reach second end 415, alarm device will send early warning signal, avoids the liquid level to reach second end 415, causes sewage to flow back to ground from liquid recovery passageway 412, causes secondary pollution, can avoid moreover that sewage is sucked into motor and machine inside after the overfilling.

The warning height may be a specific threshold, such as two-thirds of the height of the collection chamber 413, or a height range within the collection chamber 413 that is five centimeters lower than the second end 415, and so on, and the specific setting may be defined reasonably according to the actual volume of the product. In another embodiment, the warning height may refer to a height of the reflective structure, and since the reflective structure extends into the recycling box 41, the warning height may be indirectly determined as long as the height of the reflective structure is determined, and the reflective structure may be disposed at a higher position without affecting the cleaning performance, so as to ensure that the recycling box 41 can collect as much liquid as possible at a single time, and reduce the number of times that the user pours the liquid or cleans the recycling box 41.

Referring to fig. 2, the light transmitting portion 44 is disposed in the recycling box 41 and extends from top to bottom, in the illustrated embodiment, the liquid level detecting sensor 42 and the light transmitting portion 44 both include at least two, and the two liquid level detecting sensors 42 and the light transmitting portion 44 are respectively disposed at two sides of the liquid recycling channel 412. Through setting up two at least full liquid detection sensor 42 and light transmission portion 44, these two full liquid detection sensor 42 and light transmission portion 44 mounted position are different, can guarantee the effect that full water detected (full water detects and indicates that the water level reaches the detection of early warning height, does not refer to the meaning that water has been full yet), even if when the machine slope or meet other special scenes, still can ensure that a full liquid detection sensor 42 can carry out early warning work. In other embodiments, a flood detection sensor 42 may be used.

In other embodiments, the light transmitting portion 44 may be disposed inside the recycling bin 41 to extend from top to bottom, or from bottom to top, as long as the light transmitting portion 44 is opposite to the liquid level detecting sensor 42.

The light transmitting portion 44 is provided in the recovery case 41 and is located above the recovery case 41 in the height direction. When the recovery tank 41 stores liquid, the liquid in the recovery tank 41 is collected in the recovery tank 41 through the liquid recovery channel 412, and when the reflective structure in the light transmission unit 44 is immersed in the liquid environment, the liquid level detection sensor 42 detects that the reflective structure is in the liquid environment and outputs a first signal. When the reflective structure in the light transmitting portion 44 is not submerged in the liquid environment, i.e., the liquid level is lower than the reflective structure, the reflective structure is in the air environment, and the liquid level detection sensor 42 outputs a second signal. Wherein the first signal is different from the second signal. Since the liquid level detection sensor 42 detects that the reflection structure outputs different signals in the liquid environment and the air environment, the liquid level inside the recovery tank 41 can be indirectly identified by the different detection signals of the liquid level detection sensor 42.

Referring to fig. 3 and 4, when the reflective structure in the light transmitting portion 44 is in a liquid environment, the liquid level 101 is over the reflective structure. When the reflective structure in the light transmitting portion 44 is in an air environment, the liquid level 101 is lower than the reflective structure.

The alarm device is electrically connected with the full liquid detection sensor 42, receives a signal output by the full liquid detection sensor 42, and sends out an early warning signal in response to the first signal when the alarm device receives the first signal, so as to warn a user that the height of the liquid level in the recovery box body 41 reaches an early warning height, and the recovery box body 41 needs to be poured and/or cleaned in time. When the detection signal of the full liquid detection sensor 42 is the second signal, the liquid level of the recovery tank 41 is considered to be at the safe level, and the alarm device does not respond, that is, does not send out a warning signal.

In the recovery assembly provided by the above embodiment of the present invention, the full liquid detection sensor 42 is arranged to indirectly identify whether the liquid in the recovery box 41 reaches the early warning height, and the warning device sends out the early warning signal when the liquid in the recovery box 41 reaches the early warning height, so as to remind the user to pour the liquid in time and clean the recovery box 41, so that the recovery assembly can be used normally.

Referring to fig. 1 and 2, the recycling assembly further includes a mounting seat 43 for mounting the recycling box 41. In this embodiment, the recovery tank 41 is detachably attached to the attachment base 43. The mount 43 has an abutting portion 431 that matches the liquid inlet 411, and when the recovery tank 41 is mounted to the mount 43, the abutting portion 431 matches the liquid inlet 411. In one embodiment, in order to ensure the sealing performance of the matching between the recovery tank 41 and the mounting seat 43, a butt sealing ring (not shown) may be further disposed at the position of the butt portion 431, and after the recovery tank 41 is mounted on the mounting seat 43, the sealing between the two is achieved through the butt sealing ring, so as to ensure the efficiency of sewage recovery.

Referring to fig. 1, in order to facilitate the detachment and installation of the recovery box 41, the recovery box 41 is further provided with a handle 416 and a latch 417, and the handle 416 is held by a human hand, so as to operate the movement and the liquid pouring action of the recovery box 41. The latch 417 is used to position and fix the recovery tank 41 after the recovery tank 41 is mounted to the mount 43.

The recovery tank 41 also comprises a collection tank 419 for collecting the dust and an upper cover 418 for closing said collection tank 419, the cooperation of the collection tank 419 and the upper cover 418 together forming a collection chamber 413. The light transmitting portion 44 is mounted on the upper cover 418 and extends into the collection chamber 419, i.e., the light transmitting portion 44 is mounted on the upper cover 418 and extends into the collection chamber 413.

In this embodiment, the alarm device includes a warning light, and when the full liquid detection sensor 42 outputs the first signal, the warning light is turned on when power is supplied, so as to remind the user of the full liquid in the recovery tank. Illustratively, the reminding lamp is constantly on in green when the second signal is received, and the reminding lamp is constantly on in red or flashes in red when the first signal is received. The alarm device can also be used for a voice player for playing the early warning signal. Illustratively, a full liquid voice alert is issued upon receipt of the first signal, and no voice alert is issued upon receipt of the second signal. Of course, in other embodiments, the alarm device may further include one or more of a buzzer, a display screen for displaying the warning signal, and a voice player for playing the warning signal, which is not limited herein.

The above is only one embodiment of the present invention, and any other modifications based on the concept of the present invention are considered as the protection scope of the present invention.

Claims

1. A floor scrubber, comprising:

a cleaning seat including a cleaning roller for mopping a floor;

the handle assembly is connected to the body and used for being held by a user;

2. The floor washing machine of claim 1, wherein the liquid level detection sensor comprises a light emitting unit and a light receiving unit, the light transmitting portion comprises a reflecting structure facing the light transmitting channel, and the light emitting unit and the light receiving unit are disposed on the same side of the reflecting structure;

3. The floor scrubber of claim 2, wherein the recovery tank includes a fluid inlet at a bottom of the recovery tank and a fluid recovery channel in communication with the fluid inlet, the fluid recovery channel being downstream of the fluid inlet and configured to convey recovered fluid, the fluid recovery channel including a first end proximate the fluid inlet and a second end opposite the first end, the second end being higher than the first end in a direction of rising and falling of the water level, the reflective structure being lower than the second end.

4. The scrubber of claim 2, wherein the light emitting unit is an infrared emitting unit, the light receiving unit is an infrared receiving unit, and the light signal is an infrared light signal.

5. The scrubber of claim 2, wherein the reflective structure includes a first reflective surface and a second reflective surface, the first reflective surface and the second reflective surface being disposed at an angle, the angle being greater than 0 ° and less than 180 °.

6. The scrubber of claim 5, wherein the first reflective surface and the second reflective surface are disposed at substantially 90 °.

7. The floor scrubber of claim 6, wherein the first reflective surface is disposed at 45 ° to the direction of light from the light emitting unit 421.

8. The scrubber of claim 6, wherein the second reflective surface is oriented at 45 ° to the light receiving unit.

9. The floor scrubber of claim 1, wherein the recovery tank includes a collection tank and a cover for enclosing the collection tank, the light transmitting portion being mounted to the cover and extending into the collection tank.

10. The floor washing machine as claimed in claim 1, wherein the alarm device comprises one or more of a warning light, a buzzer, a display screen for displaying the early warning signal, and a voice player for playing the early warning signal.