Water pump assembly and scrubbing device

Abstract

The utility model discloses a water pump assembly which is installed on a scrubbing device, the scrubbing device is provided with a driving motor, and the water pump assembly comprises a water pump, a shell frame and an end cover assembly. A water pump is installed on the rear portion of the shell frame, a wiring cavity is formed in the front portion of the shell frame and used for containing one end of an elastic needle set electrically connected with the water pump and the driving motor, the other end of the elastic needle set is electrically connected with a power source assembly of the scrubbing device, and the power source assembly provides power for the water pump and the driving motor. The end cover assembly comprises an end cover covering the front portion of the shell frame and an elastic needle set installed on the end cover, and the other end of the elastic needle set extends out of the wiring cavity to elastically abut against the output end of the power supply assembly. The water pump is electrically connected with the vibrating needle group; the scrubbing device comprises an upper shell and a bottom shell, the water pump assembly is sealed in the scrubbing device through the upper shell and the bottom shell, and when the power supply assembly is installed on the scrubbing device, the power supply assembly is electrically connected with the water pump assembly; the shell frame and the end cover assembly enable the water pump to take electricity outwards more conveniently and enable the water pump to be connected with an external pipeline more conveniently.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 202422308565.8, entitled "A Water Pump Assembly and Scrubbing Device", filed on September 20, 2024, the contents of which are incorporated herein by reference. Technical Field

[0002] This utility model relates to the field of cleaning equipment technology, and in particular to a water pump assembly and a scrubbing device for a portable scrubbing device. Background Technology

[0003] Traditional car wash equipment often occupies space large enough to accommodate a whole car. The washing process involves spraying water and cleaning solution onto the vehicle body and using large mechanical rollers to scrub and rinse it. The entire car wash equipment is bulky, consumes a lot of water and electricity, and is noisy. In recent years, with the popularization of floor scrubbers, portable scrubbing devices have emerged, evolving from "water and dust circulation" floor scrubbers. The portable scrubbing device uses a motor to drive a cleaning drum to wipe the car body. The portable scrubbing device is also equipped with a water supply system and a water tank to clean the cleaning drum, thus perfectly cleaning the car body.

[0004] Existing portable "water-dust circulation" scrubbing devices can continuously scrub vehicle surfaces. However, the installation of the built-in water pump is relatively complex, requiring cumbersome power supply and control circuitry for the pump, as well as piping to draw clean water from the water supply system and deliver it to the cleaning rollers of the scrubbing device. Furthermore, the water pump is merely a liquid delivery component installed inside the casing of the scrubbing device; it does not provide support for the casing and is susceptible to external vibrations that could shorten its lifespan.

[0005] Chinese patents CN202410288003.3, CN202410291406.3, and CN202410291415.2 disclose a water pump assembly installed in a car wash machine with a cleaning head. The assembly includes a housing, an inner housing, a water pump, a rear cover, and a front cover. The housing has a semi-closed end and an open end, with the open end having an opening. One end of the inner housing is detachably connected to the semi-closed end, and the other end closes the open end and also has an opening. The water pump includes an inlet / outlet end and an electrical connection end. The rear cover and housing... The opening of the body or inner shell is detachably connected, and the water inlet and outlet end extends through the rear cover; the front cover includes a front cover detachably connected to the semi-closed end and an electrode sandwiched between the front cover and the inner shell. The electrode is electrically connected to the power terminal and partially extends out of the front cover to draw power from the outside; after the water pump is installed into the inner shell and the outer shell in sequence, the front cover and the rear cover are then covered, which can seal the water pump in the shell. The shell, inner shell, rear cover and front cover play a supporting role when under force to prevent the water pump from being impacted by external forces, making it more convenient for the water pump to draw power, pump and transport water. Chinese patent CN202410287999.6 discloses a water pump assembly and a scrubbing device. The water pump assembly is installed inside the body of the scrubbing device and includes a housing, a water pump, a water outlet end cap, a power supply end cap, and an electrode structure. The housing has a cavity. The water pump is installed in the cavity and has a first end and a second end. The water outlet end cap, near the scrubbing head, closes the opening of the cavity and provides a through-flow structure for pipes connected to the inlet and outlet. The power supply end cap is located away from the scrubbing head, and the electrode structure is located between the power supply end cap and the housing. The cavity includes a first space and a second space to accommodate a portion of the water pump, with a gap between the water pump and the housing. Because the water pump is located on two fixed surfaces at opposite ends through different components, the water pump can provide some support to the housing under stress, extending its service life. The above four patent applications were all prior applications by the applicant's affiliated companies. The water pump assemblies all adopt a three-section design of front cover, housing, and outlet cover. The water pump is sealed in the housing located between the front cover and the outlet cover. Although the three-section design increases the water pump assembly's ability to resist external impacts, the water pump and control board installed in the housing are very difficult to disassemble in case of failure, which reduces the maintainability and maintenance efficiency of the water pump assembly. Moreover, the sealing structure also hinders the heat dissipation of the water pump. Therefore, further improvements are necessary. Utility Model Content

[0006] The main technical problem solved by this utility model is to provide a water pump assembly and a scrubbing device to reduce the difficulty of arranging the internal control circuit and water pump suction and delivery pipeline of the scrubbing device. This utility model also improves the vibration resistance of the water pump assembly, extends the service life of the water pump built into the scrubbing device, improves the overall structural rigidity of the scrubbing device, and enhances the maintainability of the water pump assembly by strengthening the corresponding support positions of the water pump assembly and the scrubbing device.

[0007] To address the aforementioned problems, in a first aspect, this utility model provides a water pump assembly installed in a scrubbing device, the scrubbing device being equipped with a drive motor, comprising:

[0008] The water pump includes an inlet and outlet end and an electrical connection end. The inlet and outlet end are connected to the scrubbing device through pipelines.

[0009] The frame has a water pump installed at the rear and a wiring cavity at the front.

[0010] The end cap assembly includes an end cap covering the front of the housing and a spring pin assembly mounted on the end cap. One end of the spring pin assembly extends out of the wiring cavity to elastically abut against the power supply assembly of the scrubbing device, and the other end of the spring pin assembly is electrically connected to the power supply terminal of the water pump.

[0011] When the power supply unit is installed in the scrubbing device, the power supply unit is electrically connected to the water pump unit.

[0012] In one or more alternative embodiments, the power supply component provides power to the water pump and drive motor, and the wiring cavity is used to accommodate one end of the spring pin assembly that is electrically connected to the water pump and drive motor. One end of the spring pin assembly extends out of the wiring cavity to be flexibly electrically connected to the output terminal of the power supply component.

[0013] In one or more alternative embodiments, the scrubbing device includes an upper housing and a lower housing that seal the water pump assembly inside the scrubbing device.

[0014] In one or more alternative embodiments, a control board is also installed at the rear of the housing. The control board is electrically connected to the water pump, the drive motor, and the spring pin assembly. The control board controls the water pump and the drive motor to work together.

[0015] In one or more alternative embodiments, the front of the housing is provided with an opening, and an end cap sealing cover is provided at the opening to form a wiring cavity, so as to prevent water from entering the wiring cavity through the end cap and also to prevent water from directly passing through the front of the housing to the rear of the housing.

[0016] In one or more alternative embodiments, the end of the housing near the opening is provided with a partition that divides the housing into a front and a rear section. The partition is provided with a wire passage hole, and the control board is electrically connected to the spring pin assembly through the wire harness passing through the wire passage hole.

[0017] In one or more alternative embodiments, the rear of the housing has openings at the top and bottom and has an H-shaped cross-section, with the upper rear opening for accommodating the control panel and the lower rear opening for accommodating the water pump.

[0018] In one or more alternative embodiments, the spring pin assembly includes:

[0019] The positive electrode spring is connected to the positive terminal of the output terminal and the positive power supply of the control board, respectively.

[0020] The negative electrode spring is connected to the negative terminal of the output end and the negative power supply of the control board, respectively.

[0021] The communication positive spring pins are electrically connected to the output terminal and the communication positive pin of the control board, respectively.

[0022] The communication negative pin is electrically connected to the output terminal and the communication negative pin of the control board, respectively.

[0023] In one or more alternative embodiments, the rear lower opening of the frame has outwardly extending retaining lugs on both sides to secure the frame to the bottom shell.

[0024] In one or more alternative embodiments, multiple weight-reduction holes are also provided on the side walls of the rear lower opening of the housing, which help the water pump dissipate heat.

[0025] In one or more alternative embodiments, the housing has multiple reinforcing ribs extending downward from the root of the rear lower opening between the partition and the water pump electrical terminal. The height of the reinforcing ribs extending downward is flush with the outer cylindrical surface of the water pump electrical terminal. A gap is left between the reinforcing ribs and the two electrical electrodes of the water pump electrical terminal to facilitate the electrical connection of the two electrical electrodes to the control board.

[0026] In one or more alternative embodiments, reinforcing ribs extend outward from the area of ​​the rear lower opening side walls near the reinforcing ribs. The ends of the reinforcing ribs and reinforcing ribs are adapted to the columnar outer surface of the water pump to protect the outer surface of the water pump from external impacts.

[0027] In one or more alternative embodiments, a nut post is provided in the upper rear opening of the housing, and support posts are provided on the four sides of the upper rear opening. The support posts support the control plate, and the control plate can be fixed in the upper rear opening with screws.

[0028] In one or more alternative embodiments, a step is provided in the upper rear opening of the housing, with the side of the step away from the front being higher than the side closer to the front, so that the lower rear opening has more space to accommodate the water pump.

[0029] In one or more alternative embodiments, the extension and retraction direction of the spring pin assembly is not on the same straight line as the water pump inlet and outlet direction.

[0030] In one or more alternative embodiments, the extension and retraction direction of the spring pin assembly forms an acute angle with the water pump inlet and outlet direction.

[0031] In one or more alternative embodiments, the step divides the space of the rear lower opening of the housing into a first space for accommodating the electrical terminal and a second space for fixing the water inlet and outlet terminals, the first space having radial dimensions different from the second space.

[0032] In one or more alternative embodiments, at least one sealing ring engaging groove is provided on the outer side of the peripheral wall at the front of the housing. The sealing ring engaging groove is used to engage the sealing ring to achieve isolation and sealing of the handle portion of the bottom housing of the entire scrubbing device when the water pump assembly is installed between the bottom housing and the top housing of the scrubbing device.

[0033] Secondly, this utility model provides a scrubbing device, including a handle and a scrubbing head connected to the handle, a water tank, and a water pump assembly as described in the first aspect, wherein the water pump assembly delivers clean water from the water tank to a cleaning roller on the scrubbing head.

[0034] In summary, the beneficial effects of this utility model are:

[0035] The pump assembly's housing securely holds the pump in an open configuration between the housing and the bottom housing of the cleaning device. This provides support to both the housing and the bottom housing under load, preventing impacts on the pump during operation and extending its lifespan. Simultaneously, the housing's open H-shaped cross-section facilitates electrical connection between the pump and the control system, while also providing ample open ventilation space for both. This open installation space also makes connecting the pump's inlet and outlet to external water extraction and delivery pipelines more convenient.

[0036] The extension and retraction direction of the spring pin assembly installed on the end cap of the water pump assembly forms an acute angle with the water inlet and outlet direction of the water pump. This allows the water pump assembly to stably and elastically connect with the power supply component inside the handle of the scrubbing device, and directly connect with the power supply component for signal transmission. This provides sufficient strength support for the entire scrubbing device at the corner where the handle and the body meet, making it convenient for users to hold the handle with one hand or both hands to clean the surface to be cleaned.

[0037] Because the water pump assembly has an end cap at the end furthest from the scrubbing head, and the spring pin assembly protruding from the end cap is close to the output end of the power supply component inside the handle, the water pump inlet and outlet are close to the scrubbing head. This makes the water pipe and power supply lines more streamlined, resulting in a more compact overall structure for the scrubbing device. Furthermore, the water pump assembly is positioned on two fixed surfaces at both ends through different components, allowing the pump assembly's housing to provide support under stress and extending the overall service life of the scrubbing device. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the description only show some embodiments of this utility model, and therefore should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a perspective view of the water pump assembly of this utility model.

[0040] Figure 2 This is a perspective view of the water pump assembly of this utility model from another angle.

[0041] Figure 3 This is a perspective view of the housing of the water pump assembly of this utility model.

[0042] Figure 4 This is a front view of the housing of the water pump assembly of this utility model.

[0043] Figure 5 This is a top view of the housing of the water pump assembly of this utility model.

[0044] Figure 6 This is a left view of an embodiment of the water pump assembly of this utility model.

[0045] Figure 7 This is a bottom view of an embodiment of the water pump assembly of this utility model.

[0046] Figure 8 yes Figure 1 A cross-sectional view along the AA direction.

[0047] Figure 9 This is an exploded view of the water pump assembly of this utility model.

[0048] Figure 10 This is an exploded view of the water pump assembly of this utility model from another perspective.

[0049] Figure 11 This is an exploded view of the scrubbing device structure configured with the water pump assembly of this utility model.

[0050] Figure 12 This is a planed view of the scrubbing device configured with the water pump assembly of this utility model.

[0051] Figure 13 yes Figure 12 Enlarged view of a section at point C.

[0052] Explanation of reference numerals in the attached figures:

[0053] 10. Water pump assembly;

[0054] 100. Shell frame; 100A. Lower rear opening; 100B. Upper rear opening; 101. Reinforcing rib; 102. Fixing lug; 103. Nut post; 104. Cable guide hole; 105. Reinforcing side rib; 106. Weight reduction hole; 107. Fixing nut post; 108. Sealing ring retaining groove; 108'. Sealing ring; 109. Sealing ring;

[0055] 200. End cap assembly; 200A. Wiring cavity; 201. Positive electrode spring; 202. Negative electrode spring; 203. 485 communication positive spring; 204. 485 communication negative spring; 205. End cap;

[0056] 400. Water pump; 401. Inlet; 402. Outlet;

[0057] 500. Control panel;

[0058] 21. Bottom shell;

[0059] 22. Upper shell; 221. Water tank locking mechanism; 2211. Unlock button; 2212. Unlock push rod; 2213. Spring; 2214. Locking rod;

[0060] 30. Cleaning roller;

[0061] 40. Water tank assembly;

[0062] 50. Battery assembly;

[0063] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0064] The claims of this utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are also within the protection scope of this utility model.

[0065] It should be understood that in the embodiments of this utility model, all directional terms such as "up," "down," "left," "right," "front," and "back" indicate the orientation or positional relationship based on the orientation and positional relationship shown in the accompanying drawings or the orientation or positional relationship commonly used when the utility model product is in use. These terms are only for the purpose of simplifying the description of this utility model and do not explicitly or implicitly suggest that the device, element, or component referred to must have a specific orientation or specific orientational structure, and should not be construed as a limitation of this utility model. They are only used to explain the relative positional relationships and movement of the components shown in the accompanying drawings. When the specific posture changes, the directional indication may also change accordingly. Regarding processes and methods, unless the specification explicitly states that each step must be performed in sequence, excluding cases where changing the order of steps would prevent the achievement of the corresponding utility model objective, they are all considered as examples of optimal or superior embodiments selected for the sake of simplicity.

[0066] Furthermore, in this utility model, ordinal numbers such as "first" and "second" are used only for distinguishing purposes and should not be construed as indicating or implying their relative importance or the quantity of the indicated technical features. Thus, the features referred to as "first" and "second" can explicitly or implicitly indicate at least one of those technical features. In this utility model, for ease of explanation, quantifiers such as "one," "two," "multiple," "at least one," or "several" may be used to define technical (structural) features. "Multiple" means at least two, i.e., two or more; "at least one" and "several" mean one or more corresponding technical features. These quantifiers are only for illustrating the specific embodiment or preferred implementation, and should be included as long as they do not contradict the overall concept and purpose of the utility model, unless explicitly stated that the quantifiers are necessary for implementation or to achieve the purpose of the utility model.

[0067] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on" should be interpreted broadly. For example, they can refer to a relatively fixed positional relationship between components, or a physically fixed connection between components; they can be detachable connections or integral structures; they can be mechanical connections or electrical signal connections; they can be direct connections or indirect connections through intermediate media or components; they can refer to the internal connection of two elements or the interaction between two elements. Unless otherwise explicitly limited in the specification, other interpretations will not achieve the corresponding functions or effects. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0068] If the controllers or control circuits involved in this utility model are conventional control technologies or units for those skilled in the art, such as the controller's control circuit, they can be implemented by those skilled in the art using existing methods, such as simple programming. If the software or program involved in conjunction with the hardware to achieve the control result is not described in detail in the description, it belongs to the use of existing technology or conventional technology for those skilled in the art. The power supply also uses the aforementioned existing technology in the art. Furthermore, since the main utility model's technical point lies in the improvement of the mechanical device, this utility model will not describe the specific circuit control relationships and circuit connections in detail.

[0069] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the present invention.

[0070] The applicant discovered that the installation of the built-in water pump in some existing handheld car washers is quite complex. For example, the applicant's Chinese utility model patent with publication number CN218141448U discloses a handheld car washer, including a body, a water tank snapped onto the upper front side of the body, a cleaning head housing extending outward from the front of the body for snapping onto the wiping roller, and a handle connected to the end of the body; the cleaning mechanism is installed inside the cleaning head housing, the pump and part of the delivery pipeline in the cleaning fluid delivery mechanism are installed inside the body, part of the delivery pipeline in the cleaning fluid delivery mechanism and a section of the pipeline in the cleaning fluid delivery mechanism passing through the wiping roller are installed inside the cleaning head housing, the control circuit board, battery, and display panel of the handheld car washer are installed inside the handle, and the body, cleaning head housing, and handle are all equipped with power harnesses, signal harnesses, and connectors for providing power or transmitting sensor signals to the car wash device.

[0071] The applicant also found that in some other handheld car wash machines, the control circuit board, battery, and display panel were installed inside the handle, and the water pump was installed inside the machine body. The electrical connections between the control circuit board, battery, display panel, and water pump were too complicated, making it inconvenient for mass production and user maintenance and replacement of parts. For example, the applicant's Chinese utility model patent with publication number CN218907182U discloses a handheld electric car washer including a body, a water tank that is snapped onto the upper front side of the body, a cleaning head housing that extends outward from the front of the body to snap onto the wiping roller, and a handle connected to the end of the body. The pump and part of the delivery pipeline in the cleaning fluid delivery mechanism are installed inside the body. Part of the delivery pipeline in the cleaning fluid delivery mechanism and a section of the pipeline in the cleaning fluid delivery mechanism that passes through the wiping roller are installed inside the cleaning head housing. The upper part of the cleaning head housing is covered with a body cleaning head cover. The control circuit board 6, battery 7, and display panel of the handheld car washer are installed inside the handle. A water tank locking mechanism is provided next to the water tank that is snapped onto the upper surface of the body. A handle locking mechanism is provided next to the connection between the body and the handle. A body connection cover is provided on the upper surface of the body, which hides the mechanical locking structure of the handle locking mechanism and the water tank locking mechanism inside the body. Only the button for triggering the locking mechanism is exposed on the upper surface of the body.

[0072] In summary, the applicant concludes that the installation of the pump built into the existing handheld car washing machine is relatively complicated. It also requires cumbersome connections to the circuits that supply power and control the pump, as well as the water path that draws clean water from the water supply system and delivers clean water to the cleaning roller of the washing device. At the same time, the pump is only a component installed inside the casing of the washing device, and it cannot provide sufficient support for the entire casing of the washing device. It is also easy for the casing of the washing device to be subjected to external vibration, which will shorten the service life of the pump.

[0073] Therefore, in order to reduce the difficulty of arranging the internal control circuit and water pump suction and delivery pipeline of the scrubbing device, to improve the vibration resistance of the internal water pump components of the scrubbing device, and at the same time ensure the space and open area for external heat dissipation of the water pump, extend the service life of the water pump built into the scrubbing device, and to improve the overall structural rigidity of the scrubbing device, the applicant has further developed and made this utility model.

[0074] Firstly, this utility model provides a water pump assembly. For example... Figures 1 to 10As shown, a water pump assembly 10 is installed in a scrubbing device with a scrubbing head. The water pump assembly 10 includes a housing 100, a water pump 400, and an end cap assembly 200. The housing 100 includes a front part and a rear part. A control board 500 and the water pump 400 are installed in the rear part of the housing 100. The rear part of the housing 100 has an upper rear opening 100B and a lower rear opening 100A. The control board 500 is installed in the upper rear opening 100A, and the water pump 400 is installed in the lower rear opening 100B. The front part of the housing 100 has a wiring cavity 200A with an opening. The wiring cavity 200A is used to accommodate one end of the spring pin assembly that is electrically connected to the water pump 400 and the control board 500. The other end of the spring pin assembly is electrically connected to the power supply component 50 of the scrubbing device. The power supply component 50 provides power to the control board 500, the water pump 400, and the drive motor (not shown in the attached figure) of the scrubbing head. The end of the housing 100 near the scrubbing head is open, and the end of the housing 100 away from the scrubbing head is a power outlet (not shown in the attached figure). The housing 100 is installed on the bottom shell 21 of the scrubbing device after the control board 500 and the water pump 400 are installed. The upper and lower rear sides of the housing 100 are hollow, forming an open space, which provides good heat dissipation for the control board 500 and the water pump 400. The end cover assembly 200 includes an end cover 205. A spring pin assembly is mounted on the end cover 205, with the other end of the spring pin assembly extending out of the wiring cavity 200A to elastically abut against the output end of the power supply assembly 50; the power take-off opening of the housing 100 is detachably and sealingly connected to the end cover 205, surrounding the wiring cavity 200A; the other end of the housing 100 is open on both the upper and lower sides; the water pump 400 is installed in the lower rear opening 100A of the housing 100; the water pump 400 includes an inlet / outlet end (not shown in the figure) and a power connection end (not shown in the figure); the inlet / outlet end has an inlet 401 and an outlet 402; the power connection end has two wiring electrodes (not shown in the figure); the inlet 401 of the water pump inlet / outlet end... The water outlet 402 is connected to the cleaning head of the cleaning device via a pipeline, delivering clean water from the water tank assembly 40 to the surface of the cleaning roller 30 of the cleaning head and sucking up the wastewater from the cleaning roller 30 after scrubbing the surface to be cleaned, returning it to the water tank assembly 40. The wastewater is filtered into clean water in the water tank assembly 40 and then sent out again to the surface of the cleaning roller 30, thus repeating the cycle. The end cap 205 is detachably and sealingly connected to the housing 100. The end cap 205 draws power from the outside and communicates with the outside through the spring pin assembly. The water pump assembly 10 can be installed on the bottom housing 21 of the cleaning device, and then the upper housing 22 of the cleaning device is closed to complete the installation of the water pump assembly 10 in the cleaning device. When the power supply assembly 50 is installed in the scrubbing device, the power supply assembly 50 is electrically connected to the water pump assembly 10.

[0075] Specifically, such as Figure 1 , Figure 9 , Figure 10 As shown, the power connection terminals of the water pump 400 are equipped with power contact one and power contact two (not shown in the attached figure). A cable can easily pass through the lower rear opening 100A and into the wiring cavity 200A to electrically connect to the spring pin assembly, allowing the power supply component 50 to provide power to the water pump 400. Simultaneously, since the rear of the housing 100 is open on both the upper and lower sides, the control board 500 can conveniently utilize the open space to connect a cable through the upper rear opening 100B and into the wiring cavity 200A to electrically connect to the spring pin assembly, allowing the power supply component 50 to provide power. Furthermore, the control board 500 can electrically connect to the power contact one and power contact two of the water pump 400 via a cable, ensuring that the power supply component 50 provides sufficient power to control the operation of the water pump 400. When the water pump 400 malfunctions, the open housing 100 allows for easy observation of the cables connecting the water pump 400, control board 500, wiring cavity 200A, and spring pin assembly. This facilitates user inspection of cables, electrical connections, and the control board for signs of high-current burning, and also allows for direct observation of the control system, enabling maintenance personnel or users to perform appropriate maintenance diagnostics. The open housing 100 allows maintenance personnel or users to directly disassemble the water pump 400 and housing 100 after assembly when the water pump assembly fails, and directly feel the temperature of the water pump 400's outer casing. This indirectly indicates whether the water pump 400 has been operating in a high-temperature environment for an extended period before the malfunction, facilitating appropriate maintenance diagnostics. The water pump 400's casing is typically made of metal with pre-existing open spaces, which helps the water pump 400 dissipate heat from the environment through radiation and air convection, thus extending its service life.

[0076] This utility model's water pump assembly embodiment features an open-type housing that secures the water pump between the housing and the bottom shell of the cleaning device. This provides support to both the housing and the bottom shell under stress, preventing impacts on the pump during operation and extending its lifespan. Simultaneously, the H-shaped cross-section structure with openings at the rear of the housing facilitates electrical connection between the water pump and the control system, while also providing sufficient open ventilation space for both. The open installation space also makes it easier to connect the pump's inlet and outlet to external water extraction and delivery pipelines. The spring pin assembly on the end cover of the water pump assembly forms an acute angle with the pump's inlet and outlet directions, allowing the pump assembly to reliably and directly connect to the power supply component inside the cleaning device handle for power supply and signal transmission. This provides sufficient strength support at the corner where the handle and body meet, allowing users to easily hold the cleaning device with one or both hands for cleaning.

[0077] In one or more alternative embodiments, such as Figure 4 , Figure 7 , Figure 8 , Figure 9 As shown, the housing 100 is provided with a partition 109 dividing the housing 100 into a front and a rear part at one end near the power access opening; the partition is provided with a wire passage hole 104, and the control board 500 is electrically connected to the spring pin assembly through the wire passage hole 104 via a wire harness (not shown in the figure).

[0078] In one or more alternative embodiments, such as Figure 3 , Figures 7 to 10 As shown, the longitudinal section of the rear part of the frame 100 is H-shaped, the upper rear opening is used to accommodate the control panel 500, and the lower rear opening 100A is used to accommodate the water pump 400.

[0079] In one or more alternative embodiments, such as Figure 3 , Figures 7 to 10 As shown, the end cap 205 seals the opening at the front of the housing 100 to prevent water from entering the wiring cavity 200A through the end cap 205. It also prevents water from passing directly through the gap between the bottom housing 21 and the power supply assembly 50 at the handle of the cleaning device, reaching the rear of the housing 100. This avoids water entering the cleaning device from affecting the normal operation of the control board 500 and the water pump 400.

[0080] In one or more alternative embodiments, such as Figure 3 , Figures 7 to 10 As shown, the spring pin assembly includes a positive electrode spring pin 201, a negative electrode spring pin 202, a communication positive spring pin 203, and a communication negative spring pin 204. The positive electrode spring pin 201 is electrically connected to the positive terminal of the power supply component 50 output and the positive power supply of the control board 500, respectively. The negative electrode spring pin 202 is electrically connected to the negative terminal of the power supply component 50 output and the negative power supply of the control board 500, respectively. The communication positive spring pin 203 is electrically connected to the output terminal of the power supply component 50 and the positive communication pin of the control board 500, respectively. The communication negative spring pin 204 is electrically connected to the output terminal of the power supply component 50 and the negative communication pin of the control board 500, respectively.

[0081] The spring-loaded assembly facilitates a flexible and reliable electrical connection between the water pump assembly and the power supply assembly of the cleaning device. This ensures that the cleaning device maintains a reliable electrical connection even when subjected to external impacts, preventing it from ceasing operation. The spring-loaded assembly provides sufficient elasticity and redundancy to guarantee a reliable electrical connection between the power supply assembly and the power supply assembly even when there is a relative displacement within a certain range (the relative displacement value is less than the extension / retraction amount of the spring-loaded assembly).

[0082] In one or more alternative embodiments, such as Figures 1 to 5 , Figure 7 , Figure 9 , Figure 10 As shown, the rear lower opening of the housing 100 has two side walls with outwardly extending fixing ears 102 for fixing the housing 100 to the bottom housing 21. The fixing ears 102 are detachably connected to the bottom housing 21 of the scrubbing device. When the user needs to maintain the water pump assembly 10, they only need to remove the upper housing 22 of the scrubbing device from the bottom housing 21, then loosen and remove the screws of the fixing ears 102 on both sides of the water pump assembly 10, and then manually remove the entire water pump assembly 10 from the bottom housing 21 of the scrubbing device. The L-shaped hanging ears 102 are located on the rear lower opening of the housing 100, and their structure itself has a certain capacity to absorb stress and strain. After the water pump 400 and control board 500 are installed on the housing 100, even if the entire water pump assembly is subjected to a certain external impact, the L-shaped hanging ears 102 can effectively absorb the stress and strain generated by the external impact, ensuring the stable operation of the water pump 400 and control board 500.

[0083] In one or more alternative embodiments, such as Figures 1 to 3 , Figure 6 , Figure 9 , Figure 10 As shown, the rear lower opening of the housing 100 is provided with a plurality of weight-reducing holes 106 on both sides of the rear lower opening. The weight-reducing holes help the water pump dissipate heat. The weight-reducing holes also help the other non-perforated parts of the housing 100 to be more efficiently injection molded during the manufacturing process, which is beneficial to improve the overall rigidity of the entire housing 100 while reducing the total weight.

[0084] In one or more alternative embodiments, such as Figure 1 , Figure 5 , Figure 6 , Figure 9 , Figure 10 As shown, the housing 100 has multiple reinforcing ribs 101 extending downwards from the root of the rear lower opening between the partition 109 and the power connection terminal of the water pump 400. The height of the downward extension of the reinforcing ribs 101 is flush with the outer cylindrical surface of the power connection terminal of the water pump 400. A gap is left between the reinforcing ribs 101 and the two power connection electrodes of the power connection terminal of the water pump 400 to facilitate the electrical connection of the two power connection electrodes to the control board 500. The reinforcing ribs 101 can improve the rigidity of the housing 100 in the axial direction of the water pump 400 and further reduce the weight of the entire housing 100.

[0085] In one or more alternative embodiments, such as Figure 1 , Figure 5 , Figure 6 , Figure 9 , Figure 10 As shown, as needed, the frame 100 is also provided with reinforcing ribs to enhance its load-bearing strength and reduce its weight. Reinforcing ribs 105 extend outward from the areas of the two side walls of the rear lower opening of the frame 100 near the reinforcing ribs 101. The ends of the reinforcing ribs 105 and 101 conform to the columnar outer surface of the water pump 400. The extending direction of the reinforcing ribs 105 is consistent with the axial direction of the water pump 400 to protect the water pump 400 from external impacts. The reinforcing ribs 105 can increase the overall strength of the portion of the frame 100 transitioning from the front to the rear, and can also further reduce the overall weight of the frame 100.

[0086] In one or more alternative embodiments, such as Figure 2 , Figure 3 , Figure 7 , Figure 8 As shown, a nut post (not shown in the attached figure) is provided in the upper rear opening of the housing 100, and support posts (not shown in the attached figure) are provided on the four sides of the upper rear opening. The support posts support the control board 500, and the control board 500 can be fixed in the upper rear opening 100B with screws. The nut post and support posts provide a good point of force when the control board 500 is installed in the upper rear opening 100B, which can prevent the control board 500 from shaking arbitrarily in the upper rear opening 100B and causing the electrical connection between the control board 500 and the water pump 400 and the spring needle assembly to fail, and can prevent the components on the control board 500 from failing due to shaking.

[0087] In one or more alternative embodiments, such as Figure 2 , Figure 3 , Figure 7 , Figure 8 As shown, a step (not shown in the figure) is provided in the upper rear opening of the housing 100. The side of the step away from the partition 109 is higher than the side closer to the partition 109, so that the lower rear opening of the housing 100 has more space to accommodate the water pump 400.

[0088] A step is provided in the upper rear opening of the housing 100, which also divides the space of the lower rear opening of the housing 100 into two parts with different volumes. The step facilitates the snap-fit ​​installation of the water pump 400 into the space of the lower rear opening of the housing 100. The step can also be used to absorb and absorb the impact received by the water pump 400 along the pump axis, so that the impact can be absorbed by the snap-fit ​​connection between the entire housing 100 and the bottom shell 21 of the cleaning device, which is more conducive to improving the service life of the water pump. On the other hand, other parts of the housing 100 have gaps between them and the water pump 400. The gap between the two parts can absorb the impact of large external forces when the shell is subjected to them at a specific location by the elastic deformation of the shell 100 and / or the bottom shell 21. It can also transmit a certain force, which can increase the strength of the outer shell of the entire water pump assembly 10 and prevent the impact of large external forces from being transmitted to the water pump 400 through the shell 100 and the bottom shell 21 when the entire water pump assembly 10 is subjected to them, thus avoiding damage to the water pump. At the same time, the open shell 100 can also help the water pump 400 of the water pump assembly 10 to dissipate heat in time when it is running at high speed.

[0089] Thus, gaps are provided between other parts of the housing and the water pump, gaps are provided between other parts of the housing and the control board, and gaps are provided between the bottom shell of the cleaning device and a portion of the housing. These gaps can absorb the impact of large external forces when the housing is subjected to large external forces at specific locations by utilizing the elastic deformation of the housing and / or the bottom shell, and can also transmit certain forces to other components of the cleaning device that cooperate with the water pump assembly. This increases the strength of the housing of the entire water pump assembly and prevents the impact of large external forces from being transmitted through the housing and bottom shell to the water pump and control board, thus avoiding damage to the water pump and control board.

[0090] In one specific embodiment, such as Figures 1 to 2 , Figures 8 to 10 As shown, the step divides the space of the rear lower opening 100A of the housing 100 into a first space (not shown in the figure) for accommodating the electrical terminal and a second space (not shown in the figure) for fixing the water inlet and outlet terminals. The radial dimensions of the first space and the second space are not equal. Since the maximum outer diameter of the electrical terminal of the water pump 400 is not equal to the maximum outer diameter of the water inlet and outlet terminals, this facilitates the user in easily inserting the water pump 400 into the space of the rear lower opening of the housing 100 using the step. Conversely, it also makes it easier for the user to remove the water pump 400 from the space of the rear lower opening of the housing 100.

[0091] Thus, the step divides the space of the lower rear opening of the housing into a first space for accommodating the power connection terminal and a second space for fixing the water inlet and outlet terminals. This allows the space of the lower rear opening of the housing to accommodate water pumps of various shapes, improving the efficiency and convenience of installing the water pump into the space of the lower rear opening of the housing.

[0092] In one or more alternative embodiments, such as Figures 1 to 3 , Figures 5 to 10 As shown, at least one sealing ring engaging groove 108 is provided on the outer side of the peripheral wall at the front of the housing 100, such as... Figure 8 As shown, the sealing ring snap groove 108 is used to snap the sealing ring 108', so as to achieve the isolation and sealing of the handle part of the bottom shell 21 of the entire scrubbing device when the water pump assembly 10 is installed between the bottom shell 21 and the upper shell 22 of the scrubbing device.

[0093] Thus, the water pump assembly provided by this utility model, which integrates the housing, water pump, control board, and end cover, provides support under stress, preventing the pump from being impacted by external forces and extending its service life. Simultaneously, the housing and end cover facilitate external power supply and connection to the control board, while the open housing design makes connecting the pump to external water supply pipelines easier. Furthermore, the open housing allows for quick and easy detachable connection of the pump and control board, further reducing the assembly difficulty and improving user convenience in maintaining the pump assembly.

[0094] In one specific embodiment, the control system is provided with a positive terminal, a negative terminal, a water pump power supply terminal one, a water pump power supply terminal two, a communication positive terminal, and a communication negative terminal (not shown in the attached figure); the positive electrode spring 201 is electrically connected to the positive terminal, and the negative electrode spring 202 is electrically connected to the negative terminal; the first power contact is electrically connected to the water pump power supply terminal one, and the second power contact is electrically connected to the water pump power supply terminal two; the communication positive spring 203 is electrically connected to the communication positive terminal, and the communication negative spring 204 is electrically connected to the communication negative terminal.

[0095] Thus, after the water pump assembly 10 is assembled between the bottom shell 21 and the upper shell 22 of the scrubbing device, the battery assembly 50 in the handle achieves electrical connection between the water pump 400 in the water pump assembly 10 and the control board 500 and other electrical devices of the scrubbing device through the spring pin group on the end cap assembly 200. This electrical connection includes power connection and signal connection.

[0096] In one specific embodiment, such as Figures 1 to 2 , Figures 8 to 10As shown, the spring pin assembly may include at least four sets of spring pins, namely a positive electrode spring pin 201, a negative electrode spring pin 202, a communication positive spring pin 203, and a communication negative spring pin 204. The positive electrode spring pin 201 is electrically connected to the positive terminal of the power supply component 50 output and the positive power supply of the control board 500. The negative electrode spring pin 202 is electrically connected to the negative terminal of the power supply component 50 output and the negative power supply of the control board 500. The communication positive spring pin 203 is electrically connected to the output terminal of the power supply component 50 and the communication positive pin of the control board 500. The communication negative spring pin 204 is electrically connected to the output terminal of the power supply component 50 and the communication negative pin of the control board 500. Each spring pin in the spring pin assembly specifically includes a protruding needle tip, a cylindrical needle body, and an electrical connector (not shown in the attached diagram) for welding or crimping cables. The cylindrical needle body extends beyond the outer surface of the end cap 205. The protruding needle tip can extend or retract along the axis of the cylindrical needle body under the elastic force of the elastic element, which is installed inside the cylindrical needle body, to achieve electrical connection with the output terminal of the power supply assembly 50. The extension and retraction direction of the protruding needle tip is not on the same straight line as the normal line of the end face of the water pump 400's inlet and outlet.

[0097] In one specific embodiment, further, such as Figures 8 to 10 As shown, the extension and retraction direction of the spring pin assembly forms an acute angle with the normal to the end face of the water pump 400's inlet and outlet.

[0098] Specifically, such as Figure 8 As shown, the extension and retraction direction of the spring pin assembly forms an acute angle with the axial direction of the water pump 400. The inlet and outlet faces of the water pump 400 are perpendicular to its axial direction, therefore the extension and retraction direction of the spring pin assembly forms an acute angle α with the normal to the inlet and outlet faces of the water pump 400. Preferably, the acute angle α ranges from 5 to 60 degrees. Figure 3When the acute angle α is 5 degrees, the exposed spring pin assembly of the end cap 205 of the water pump assembly is only slightly tilted towards the output end of the power supply assembly 50 of the scrubbing device, and the two are elastically abutted. The power supply assembly 50 is located inside the handle of the scrubbing device. In this way, the handle of the scrubbing device is slightly tilted and connected to the entire body of the scrubbing device. The water pump assembly 10 is located at the connection point where the power supply assembly 50 inside the handle and the water tank assembly 40 of the scrubbing device body are connected. The concentrated water pump assembly provides strong connection and load-bearing strength to the connection point of the entire scrubbing device body. When the acute angle α is 5 degrees, the tilt angle between the handle and the body of the scrubbing device allows the user to easily and elastically abut the cleaning roller of the scrubbing device against the surface to be cleaned by simply lifting the handle slightly, making it convenient for the user to hold the scrubbing device with one hand or both hands to clean the surface. When the acute angle α is 60 degrees, the handle and the body of the scrubbing device are as follows: Figure 11 , Figure 12 The angle shown is 60 degrees, and the length of the body and the handle are roughly the same, allowing the user to easily lift the handle to allow the cleaning roller to spring against the surface to be cleaned. This facilitates convenient one-handed or two-handed cleaning. Because the lengths of the body and handle are roughly the same, the 60-degree angle provides sufficient structural strength to the water pump assembly at the corner, ensuring a strong connection. Furthermore, 60 degrees is a visually acceptable angle for the corner of a typical cleaning device, allowing users to confidently and comfortably use the device by holding the handle.

[0099] Thus, the angle between the retraction direction of the spring pin assembly and the inlet / outlet direction of the water pump forms an acute angle, allowing the water pump assembly to stably and elastically connect with the battery assembly inside the handle of the cleaning device. This provides sufficient strength support for the entire cleaning device at the corner where the handle and body meet, making it convenient for users to hold the cleaning device with one or both hands to clean the surface. Since the end of the water pump assembly away from the cleaning head of the cleaning device has an end cap, the spring pin assembly exposed at the end cap is close to the output end of the battery assembly inside the handle. This brings the water pump inlet and outlet close to the cleaning head, resulting in a simpler distribution of water pipes and power lines, making the overall structure of the cleaning device more compact. Furthermore, the water pump assembly, through different components, is located on two fixed surfaces at both ends, allowing the water pump assembly to provide some support to the housing under stress, extending the service life of the entire cleaning device structure.

[0100] It should be noted that the control board 500 can also be disposed outside the water pump assembly 10. The control board 500 can be electrically connected to the water pump assembly 10 through the spring pin group. This application does not specifically limit the method of electrical connection between the control board 500 and the power supply assembly 50. The control board 500 can be electrically connected to the power supply assembly 50 through the spring pin group or other methods. The technical solution of disposing of the control board 500 outside the water pump assembly 10 is similar to the aforementioned solution, the only difference being the specific installation position of the control board 500. Other technical details can be referred to the aforementioned technical solution, and will not be repeated here.

[0101] This utility model also provides an embodiment of a scrubbing device.

[0102] Specifically, such as Figure 11 , Figure 12 As shown, the scrubbing device includes a handle and a scrubbing head connected to the handle, a water tank assembly 40, and a water pump assembly 10. The water pump assembly 10 delivers clean water from the water tank assembly 40 to the cleaning roller 30 on the scrubbing head. The water pump assembly 10 includes a housing 100 and a water pump 400 and a control board 500 mounted on the housing 100. An end cap 205 is provided at the other end of the housing 100 away from the scrubbing head. A spring pin group connected to the control system signal for controlling the operation of the water pump is provided between the end cap 205 and the housing 100.

[0103] Specifically, the scrubbing device includes an upper shell 22, which is further provided with a water tank locking mechanism 221. The water tank locking mechanism 221 includes an unlock button 2211, a push rod 2212 that engages with the unlock button 2211, a locking rod 2214 that slidably abuts against the push rod 2212, and a spring 2213 that engages between the locking rod 2214 and the upper shell 22 to drive the locking rod 2214 to move laterally. The water tank locking mechanism 221 can quickly fix the water tank assembly 40 on the upper shell 22 of the scrubbing device, and further lock / unlock the water tank 40 on the upper shell 22 of the scrubbing device. Pressing the unlock button 2211 will push the locking rod 2214 backward, thereby further releasing the locking state of the water tank assembly 40.

[0104] This utility model's scrubbing device embodiment reduces the difficulty of arranging the internal control circuit and water pump suction and delivery pipeline of the scrubbing device, improves the vibration resistance of the internal water pump assembly of the scrubbing device, and at the same time ensures the space and open area for external heat dissipation of the water pump, extends the service life of the water pump built into the scrubbing device, and improves the overall structural rigidity of the scrubbing device.

[0105] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions or combinations can be made to some structures (technical features) in one or more embodiments. Such modifications or substitutions or combinations do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, unless the possibility of substituting or combining structures (technical features) in different embodiments is explicitly excluded in the embodiments, or such substitutions or combinations are contrary to the overall concept of the utility model.

Claims

1. A water pump assembly for installation in a scrubbing device provided with a drive motor, characterized in that The utility model relates to a kind of electric washing device, including: Water pump, including inlet and outlet, electrical connection end, inlet and outlet are connected to scrubbing device by pipeline; Shell frame, its rear part is equipped with water pump, and its front part is equipped with wiring cavity; End cover assembly, including the end cover of the shell frame front part and the needle group installed on the end cover, one end of the needle group extends out of the wiring cavity to elastically abut the power supply assembly of scrubbing device, the other end of the needle group is electrically connected to the electrical connection end of water pump; When power supply assembly is installed to scrubbing device, power supply assembly is electrically connected to water pump assembly.

2. The water pump assembly of claim 1, wherein, Power supply assembly provides power for water pump and driving motor, wiring cavity is used to accommodate one end of the needle group electrically connected to water pump and driving motor, one end of the needle group extends out of the wiring cavity to elastically electrically connect the output end of power supply assembly.

3. The water pump assembly of claim 2, wherein, Scrubbing device includes upper shell and bottom shell, and upper shell and bottom shell seal water pump assembly inside scrubbing device.

4. The water pump assembly of claim 3, wherein, Shell frame rear part is also equipped with control panel, and control panel is electrically connected to water pump, driving motor and needle group, and control panel controls water pump and driving motor to work cooperatively.

5. The water pump assembly of claim 4, wherein, Shell frame front part is equipped with opening, and end cover sealing cover is equipped in opening to form wiring cavity, to prevent water from entering wiring cavity through end cover, also prevent water from directly passing through shell frame front part to reach shell frame rear part.

6. The water pump assembly of claim 5, wherein, Shell frame end close to opening is equipped with partition plate, which divides shell frame into front part and rear part, and partition plate is equipped with wire passing hole, and control panel is electrically connected to needle group through wire harness passing through wire passing hole.

7. The water pump assembly of claim 6, wherein, Shell frame rear part is open upward and downward, and cross section is H-shaped, and upper opening of rear part is used to accommodate control panel, and lower opening of rear part is used to accommodate water pump.

8. The water pump assembly of claim 7, wherein, The needle group includes: Positive electrode needle, respectively connected to positive electrode of output end and power supply positive electrode of control panel; Negative electrode needle, respectively connected to negative electrode of output end and power supply negative electrode of control panel; Communication positive needle, respectively connected to output end and communication positive pin of control panel; Communication negative needle, respectively connected to output end and communication negative pin of control panel.

9. The water pump assembly of claim 7, wherein, The side walls of the lower opening of the rear part of the shell frame extend outward respectively to have fixing lugs, so as to fix the shell frame on the bottom shell.

10. The water pump assembly of claim 7, wherein, The side walls of the lower opening of the rear part of the shell frame are also provided with a plurality of lightening holes, which help the water pump to dissipate heat.

11. The water pump assembly of any one of claims 9 or 10, wherein, The shell frame extends from the root of the lower opening of the rear part downward between the partition plate and the electrical connection end of the water pump, and the height of the reinforcing ribs extending downward is flush with the outer cylindrical surface of the electrical connection end of the water pump, and a gap is left between the reinforcing ribs and the two electrical connection electrodes of the electrical connection end of the water pump to facilitate the electrical connection of the two electrical connection electrodes to the control panel.

12. The water pump assembly of claim 11, wherein, The areas of the side walls of the lower opening of the rear part of the shell frame close to the reinforcing ribs extend outward to have reinforcing ribs, and the ends of the reinforcing ribs and the reinforcing ribs are adapted to the cylindrical outer surface of the water pump to protect the outer surface of the water pump from external impact.

13. The water pump assembly of claim 7, wherein, The rear part of the shell frame is provided with a nut column in the upper opening, and the walls around the upper opening of the rear part are provided with support columns, which support the control panel, and the control panel can be fixed in the upper opening of the rear part by screws.

14. The water pump assembly of claim 13, wherein, The rear part of the shell frame is provided with a step in the upper opening, and the side of the step away from the front part is higher than the side close to the front part, so as to provide more space for the lower opening of the rear part to accommodate the water pump.

15. The water pump assembly of claim 7, wherein, The extension direction of the needle group is not in the same straight line as the water inlet and outlet direction of the water pump.

16. The water pump assembly of claim 15, wherein, The extension direction of the needle group forms an acute angle with the water inlet and outlet direction of the water pump.

17. The water pump assembly of claim 14, wherein, The step divides the space of the rear lower opening of the shell frame into a first space for accommodating the electricity connection end and a second space for fixing the water inlet and outlet end, and the radial dimension of the first space is not equal to that of the second space.

18. The water pump assembly of claim 6, wherein, The outer side of the circumferential wall of the front part of the shell frame is provided with at least one sealing ring clamping groove for clamping a sealing ring to achieve the sealing isolation of the handle part of the bottom shell of the whole scrubbing device when the water pump assembly is installed between the bottom shell and the upper shell of the scrubbing device.

19. A scouring device characterized by, The scrubbing device comprises a handle, a scrubbing head connected with the handle, a water tank and a water pump assembly as claimed in any one of claims 1-18, The water pump assembly delivers the clean water in the water tank to the cleaning roller on the scrubbing head.

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