Water pump assembly and scrubbing device

Abstract

The invention discloses a water pump assembly for a scrubbing device. The water pump assembly comprises a shell frame, a water pump and an end cover assembly. A control panel and a water pump are 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 control panel, 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 driving motors of the control panel, the water pump and the scrubbing head. The water pump comprises a water inlet and outlet end and a power connection end, the water inlet and outlet end is connected with the scrubbing head through a pipeline, and the power connection end is electrically connected to the control panel; the end cover assembly comprises an end cover and an elastic needle group mounted on the end cover, and the other end of the elastic needle group extends out of the wiring cavity to elastically abut against the output end of the power supply assembly; the water pump assembly is sealed in the scrubbing device through the upper shell and the bottom shell of the scrubbing device, and when the power supply assembly is installed on the scrubbing device, the power supply assembly is also electrically connected to 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

Technical Field

[0001] The invention relates to the technical field of cleaning equipment, and in particular to a water pump assembly for a portable scrubbing device and a scrubbing device. Background Art

[0002] Traditional car washes often occupy a space that can accommodate at least one whole car. The car wash process involves spraying clean water and cleaning fluid on the body and scrubbing and rinsing the body with a large mechanical roller. The entire car wash is bulky, consumes water and electricity, and has a loud operating noise. In recent years, with the popularity of floor scrubbers, portable scrubbing devices have emerged that have evolved from "water-dust circulation" floor scrubbers. The motor of the portable scrubbing device drives the cleaning cylinder to wipe the body. The portable scrubbing device is also equipped with a water supply system and a sink to clean the cleaning cylinder, thereby perfectly cleaning the body.

[0003] The existing "water-dust circulation" portable scrubbing device can realize continuous scrubbing of the vehicle body surface, wherein the installation of the built-in water pump is relatively complicated, and requires cumbersome power supply and control circuit for the pump, as well as a pipeline for sucking clean water from the water supply system and delivering clean water to the cleaning roller of the scrubbing device. At the same time, the water pump is only a liquid delivery component installed inside the frame of the scrubbing device, and cannot provide support for the frame of the scrubbing device. It is easy for the frame of the scrubbing device to be subjected to external vibration, which may affect the service life of the water pump.

[0004] Chinese patents CN202410288003.3, CN202410291406.3, and CN202410291415.2 disclose a water pump assembly installed on a car scrubbing machine with a cleaning head, including a shell, an inner shell, a water pump, a rear cover, and a front cover; the shell has a semi-closed end and an open end, and the open end is provided with an opening; one end of the inner shell is detachably connected to the semi-closed end, and the other end closes the open end and is provided with an opening; the water pump includes a water inlet and outlet end and a power connection end; the rear cover is connected to the shell The opening of the body or the inner shell is detachably connected, and the water inlet and outlet parts pass through the back cover; the front cover includes a front cover detachably connected to the semi-closed end and an electrode clamped between the front cover and the inner shell, the electrode is electrically connected to the power connection end and partially extends out of the front cover to draw electricity from the outside; after the water pump is successively installed in the inner shell and the outer shell, the front cover and the back cover are covered, and the water pump can be enclosed in the shell, so that the shell, inner shell, back cover, and front cover can play a supporting role when subjected to force to prevent the water pump from being impacted by external force, making it more convenient for the water pump to draw electricity, extract and transport water. Chinese patent CN202410287999.6 discloses a water pump assembly and a scrubbing device. The water pump assembly is installed in the body of the scrubbing device, including a shell, a water pump, a water outlet cover, a power supply cover, and an electrode structure; a cavity is provided in the shell; the water pump is installed in the cavity, and has a first end of the water pump and a second end of the water pump. The water outlet cover is close to the end of the scrubbing head to close the opening of the cavity, and a through structure is provided for the passage of pipes connected to the water inlet and outlet; the power supply cover is away from the scrubbing head, and the electrode structure is provided between the power supply cover and the shell; the cavity includes a first space and a second space for accommodating a part of the water pump, and a gap is left between the water pump in the cavity and the shell. Since the water pump is formed by different components and two fixed surfaces at both ends, the water pump can play a certain supporting role on the shell when it is subjected to force, thereby extending the service life. The above four patent applications are all prior applications of the applicant's affiliated companies. The water pump assembly adopts a three-section design of a front cover, a shell, and a water outlet cover. The water pump is sealed in the shell between the front cover and the water outlet cover. Although the three-section design increases the ability of the entire water pump assembly to resist external impacts, the water pump and control panel installed in the shell are very troublesome to disassemble in the event of a failure, which reduces the maintainability and maintenance efficiency of the water pump assembly. In addition, the sealing structure also hinders the heat dissipation of the water pump. Therefore, further improvement is necessary. Summary of the invention

[0005] The main technical problem solved by the present invention is to provide a water pump assembly and a scrubbing device to reduce the difficulty of arranging the internal control circuit of the scrubbing device and the water pump suction and clean water delivery pipelines. The present invention also improves the vibration resistance of the water pump assembly, extends the service life of the built-in water pump of the scrubbing device, improves the overall structural rigidity of the scrubbing device, and improves the maintainability of the water pump assembly by strengthening the mutual cooperation between the shell frame of the water pump assembly and the shell frame support position corresponding to the scrubbing device.

[0006] In order to solve the above problems, in a first aspect, the present invention provides a water pump assembly installed in a scrubbing device having a scrubbing head, the water pump assembly comprising:

[0007] The housing frame has a control panel and a water pump installed at the rear thereof, and a wiring chamber is provided at the front thereof, wherein the wiring chamber is used to accommodate one end of a spring needle group electrically connected to the water pump and the control panel, and the other end of the spring needle group is electrically connected to a power supply assembly of the scrubbing device, and the power supply assembly provides power for a driving motor of the control panel, the water pump, and the scrubbing head;

[0008] A water pump, comprising a water inlet and outlet end and an electrical connection end, wherein the water inlet and outlet end are connected to the scrubbing head through a pipeline, and the electrical connection end is electrically connected to the control board;

[0009] An end cover assembly, comprising an end cover covering the front of the housing and the spring pin assembly mounted on the end cover, the other end of the spring pin assembly extending out of the wiring cavity to elastically abut against the output end of the power supply assembly;

[0010] The scrubbing device comprises an upper shell and a bottom shell, wherein the upper shell and the bottom shell seal the water pump assembly inside the scrubbing device, and when the power supply assembly is installed to the scrubbing device, the power supply assembly is electrically connected to the water pump assembly.

[0011] In one or some optional embodiments, the front portion of the housing is provided with an opening, and the end cover sealing cover is provided at the opening to form the wiring cavity to prevent water from entering the wiring cavity through the end cover, and also to prevent water from directly passing through the front portion of the housing to reach the rear portion of the housing.

[0012] In one or some optional embodiments, a partition is provided at one end of the housing frame close to the opening to divide the housing frame into a front part and a rear part, and a wire hole is provided on the partition, and the control board is electrically connected to the spring needle group through a wiring harness passing through the wire hole.

[0013] In one or some optional embodiments, the rear portion is opened at the top and the bottom and has an H-shaped cross section, the upper opening at the rear portion is used to accommodate the control panel, and the lower opening at the rear portion is used to accommodate the water pump.

[0014] In one or some optional embodiments, the elastic needle group includes:

[0015] A positive electrode spring needle is connected to the positive electrode of the output end and the positive power supply of the control board respectively;

[0016] Negative electrode spring needles are respectively connected to the negative electrode of the output end and the negative power supply of the control board;

[0017] A communication positive pin is electrically connected to the output terminal and the communication positive pin of the control board respectively;

[0018] The communication negative spring pin is electrically connected to the output end and the communication negative pin of the control board respectively.

[0019] In one or some optional embodiments, two side walls of the rear lower opening of the housing frame extend outwardly with fixing ears respectively, so as to fix the housing frame on the bottom shell.

[0020] In one or some optional embodiments, a plurality of weight-reducing holes are provided on both side walls of the rear lower opening of the housing frame, and the weight-reducing holes are helpful for heat dissipation of the water pump.

[0021] In one or some optional embodiments, the shell frame has a plurality of reinforcing ribs extending from top to bottom from the root of the rear lower opening between the partition and the water pump power connection terminal, the height to which the reinforcing ribs extend downward is flush with the outer cylindrical surface of the water pump power connection terminal, and a gap is left between the reinforcing ribs and the two power connection electrodes of the water pump power connection terminal to facilitate electrically connecting the two power connection electrodes to the control board.

[0022] In one or some optional embodiments, reinforcing ribs extend outward from the two side walls of the rear lower opening of the housing frame near the reinforcing ribs, and the ends of the reinforcing ribs and the 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.

[0023] In one or some optional embodiments, a nut column is provided in the rear upper opening, and support columns are provided on the surrounding walls of the rear upper opening. The support columns support the control board, and the control board can be fixed in the rear upper opening by screws.

[0024] In one or some optional embodiments, a step is provided in the rear upper opening, and a side of the step away from the front portion is higher than a side closer to the front portion, so that the rear lower opening has more space to accommodate the water pump.

[0025] In one or some optional embodiments, the extension and retraction direction of the elastic needle group is not in the same straight line as the water inlet and outlet direction of the water pump.

[0026] In one or some optional embodiments, the extension and retraction direction of the electrode cap forms an acute angle with the water inlet and outlet direction of the water pump.

[0027] In a second aspect, the present invention provides a scrubbing head 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 transports clean water in the water tank to a cleaning roller on the scrubbing head.

[0028] In summary, the beneficial effects of the present invention are:

[0029] The frame of the water pump assembly fixes the water pump in an open manner between the frame and the bottom shell of the cleaning device, so that the frame and the bottom shell of the cleaning device can play a certain supporting role when subjected to force, preventing the running water pump from being impacted by external forces, and extending the service life. At the same time, the upper and lower openings of the frame have an H-shaped cross-sectional structure, which, on the one hand, facilitates the electrical connection between the water pump and the control system, and on the other hand, allows the water pump and the control system to have sufficient open heat dissipation space. The open installation space makes it more convenient for the water inlet and outlet of the water pump to be connected to the external water extraction and delivery pipelines.

[0030] The extension and retraction direction of the spring needle group installed on the end cover of the water pump assembly forms an acute angle with the water inlet and outlet direction of the water pump, so that the water pump assembly can stably achieve elastic power supply abutment and direct signal transmission abutment with the power supply assembly in the handle of the scrubbing device, providing sufficient strength support for the entire scrubbing device at the corner where the handle and the body meet, making it convenient for the user to hold the handle with one hand and / or two hands to hold the scrubbing device to clean the surface to be cleaned.

[0031] Since the other end of the water pump assembly away from the scrubbing head of the scrubbing device is provided with an end cap, and the spring needle group exposed from the end cap is close to the output end of the power assembly in the handle, the water inlet and outlet of the water pump are close to the scrubbing head, so that the distribution of the water pipeline and the power supply line is more concise, and the overall structure of the scrubbing device is compact. At the same time, the water pump assembly is formed by different components and two fixed surfaces located at both ends, so that the shell frame of the water pump assembly can play a certain supporting role when subjected to force, thereby extending the service life of the overall structure of the entire scrubbing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the description only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] FIG. 1 is a perspective view of a water pump assembly according to the present invention.

[0034] FIG. 2 is a three-dimensional view of the water pump assembly of the present invention from another perspective.

[0035] FIG. 3 is a perspective view of a housing frame of a water pump assembly according to the present invention.

[0036] FIG. 4 is a front view of a housing frame of a water pump assembly according to the present invention.

[0037] FIG. 5 is a top view of the housing frame of the water pump assembly of the present invention.

[0038] FIG. 6 is a left side view of the water pump assembly embodiment of the present invention.

[0039] FIG. 7 is a bottom view of the water pump assembly embodiment of the present invention.

[0040] FIG. 8 is a cross-sectional view of FIG. 1 along the AA direction.

[0041] Fig. 9 It is an exploded view of the water pump assembly of the present invention.

[0042] Fig.10 It is an exploded view of the water pump assembly of the present invention from another perspective.

[0043] FIG. 11 is a schematic diagram showing the structure of a scrubbing device equipped with a water pump assembly according to the present invention.

[0044] Fig.12 It is a planing view of a scrubbing device equipped with a water pump assembly of the present invention.

[0045] Fig.13 yes Fig.12 A partial enlarged view of point C in the middle.

[0046] Description of reference numerals:

[0047] 10. Water pump assembly;

[0048] 100, shell frame; 100A, rear lower opening; 100B, rear upper opening; 101, reinforcing ribs; 102, fixing ears; 103, nut columns; 104, wire holes; 105, reinforcing side ribs; 106, weight-reducing holes; 107, fixing nut columns; 108, sealing ring clamping groove; 108', sealing ring; 109, sealing ring;

[0049] 200, end cap assembly; 200A, wiring cavity; 201, positive electrode spring pin; 202, negative electrode spring pin; 203, 485 communication positive spring pin; 204, 485 communication negative spring pin; 205, end cap;

[0050] 400, water pump; 401, water inlet; 402, water outlet;

[0051] 500, control panel;

[0052] 21. Bottom shell;

[0053] 22, upper shell; 221, water tank locking mechanism; 2211, unlocking button; 2212, unlocking push rod; 2213, spring; 2214, locking rod;

[0054] 30. Cleaning roller;

[0055] 40. Water tank assembly;

[0056] 50. Battery components;

[0057] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0058] The claims of the present invention are further described in detail below in conjunction with specific embodiments and drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments proposed by ordinary technicians in this field before making creative work also fall within the scope of protection of the present invention.

[0059] It should be understood that, in the description of the embodiments of the present invention, all directional indication terms, such as "up", "down", "left", "right", "front", "back", etc., indicate the orientation or position relationship based on the orientation, position relationship shown in the drawings or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of simplifying the description of the present invention, and does not expressly or implicitly indicate that the device, element or component referred to must have a specific orientation and a specific orientation structure, and should not be understood as a limitation on the present invention. It is only used to explain the relative position relationship, movement, etc. between the components shown in the drawings. When the specific posture changes, the directional indication may also change accordingly. For processes and methods, unless it is clearly stated in the specification that each step must be performed in sequence, excluding the case where the order of each step is changed, otherwise the corresponding invention purpose cannot be achieved, it is considered that for the sake of simplicity of description, the specification only selects the best or better one from various implementation methods as an example for explanation.

[0060] In addition, ordinal numbers such as "first" and "second" in the present invention are only used for the purpose of distinction, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. The features defined as "first" and "second" can expressly or implicitly indicate at least one of the technical features. In order to facilitate the description, the present invention may have quantifiers such as "one", "two", "multiple", "at least one" or "several" to define the technical (structural) features, where "multiple" means at least two, that is, two or more; "at least one" and "several" mean one or one and the corresponding technical features; quantifiers and other definitions are only for illustrating the specific embodiment or the best implementation method, and should be included as long as they are not contrary to the overall concept and purpose of the invention, unless it is clearly stated that the quantifiers must be used to define them in order to be implemented or to achieve the purpose of the invention.

[0061] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, the positional relationship between components can be relatively fixed, or the components can be physically fixedly connected; they can be detachably connected or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium or component; they can be internally connected between two elements or interact with each other. Unless otherwise clearly defined in the specification, other interpretations may not achieve the corresponding functions or effects. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] The controller and control circuit involved in the present invention are conventional control technologies or units of those skilled in the art. For example, the control circuit of the controller can be realized by ordinary technicians in the field using existing technologies, such as simple programming. If the software or program involved in the control result is not described in detail, it belongs to the use of existing technologies or conventional technologies of ordinary technicians in the field. The power supply also uses the existing technologies in the field, and the main technical point of the present invention is to improve the mechanical device, so the present invention will not describe the specific circuit control relationship and circuit connection in detail.

[0063] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention. The present invention is further described below in conjunction with specific embodiments, but is not intended to limit the present invention.

[0064] The applicant has found that the installation of the built-in water pump in some existing handheld car cleaning machines is relatively complicated. For example, the applicant's Chinese invention patent with publication number CN218141448U discloses a handheld car cleaning machine, including a machine body, a water tank connected to the upper side of the front end of the machine body, a cleaning head shell frame extending outward from the front end of the machine body to be connected to the wiping roller, and a handle connected to the end of the machine body; the cleaning mechanism is installed in the cleaning head shell frame, the pump and part of the delivery pipeline in the cleaning liquid delivery mechanism are installed in the machine body, part of the delivery pipeline in the cleaning liquid delivery mechanism, and a section of the pipeline in the cleaning liquid delivery mechanism through the wiping roller are installed in the cleaning head shell frame, the control circuit board, battery, and display panel of the handheld car cleaning machine are installed in the handle, and the machine body, the cleaning head shell frame, and the handle are all arranged with power harnesses, signal harnesses, and connectors for providing power to the car cleaning device or transmitting sensor signals.

[0065] The applicant also found that in some other handheld car cleaning machines, the control circuit board, battery, and display panel are installed in the handle, and the water pump is installed in the body. The electrical connection between the control circuit board, battery, display panel and water pump is too complicated, which is not convenient for mass production and user maintenance and replacement of parts. For example, the Chinese invention patent with the publication number CN218907182U of the applicant discloses a handheld electric car cleaning machine including a machine body, a water tank clamped to the upper side of the front end of the machine body, a cleaning head shell frame extending outward from the front end of the machine body for clamping a wiping roller, and a handle connected to the end of the machine body, a pump and part of the conveying pipeline in the cleaning liquid conveying mechanism are installed in the machine body, part of the conveying pipeline in the cleaning liquid conveying mechanism, and a section of the pipeline in the cleaning liquid conveying mechanism passing through the wiping roller are installed in the cleaning head shell frame, a machine body scrubbing head cover is provided on the upper part of the cleaning head shell frame, a control circuit board 6, a battery 7, and a display panel of the handheld car cleaning machine are installed in the handle, a water tank locking mechanism is provided next to the upper surface of the machine body clamped to the water tank, a handle locking mechanism is provided next to the connection between the machine body and the handle, and a machine body connection cover is provided on the upper surface of the machine body, which just hides the mechanical locking structure of the handle locking mechanism and the water tank locking mechanism in the machine body, and only the button for triggering the locking mechanism is exposed on the upper surface of the machine body.

[0066] In summary, the applicant concluded that the installation of the built-in pump in the existing handheld car scrubbing machine is relatively complicated, and requires cumbersome connection of the relevant circuits for powering and controlling the pump and the waterway for sucking clean water from the water supply system and delivering the clean water to the cleaning roller of the scrubbing device. At the same time, the pump is only a component installed in the frame of the scrubbing device and is installed internally, and cannot provide sufficient support for the frame of the entire scrubbing device. It is also easy for the frame of the scrubbing device to be subjected to external vibrations, which may shorten the working life of the pump.

[0067] Therefore, in order to reduce the difficulty of arranging the internal control circuit and the water pump suction and delivery pipelines of the scrubbing device, in order to improve the vibration resistance of the water pump assembly inside the scrubbing device, while also ensuring the space and open area for the water pump to dissipate heat to the outside and extend the service life of the built-in water pump of the scrubbing device, and in order to improve the overall structural rigidity of the scrubbing device, the applicant further developed and made the present invention.

[0068] In the first aspect, the present invention provides a water pump assembly. Fig.10As shown, the water pump assembly 10 is installed on a scrubbing device with a scrubbing head, and the water pump assembly 10 includes a housing 100, a water pump 400, and an end cover assembly 200; the housing 100 includes a front portion and a rear portion, and a control board 500 and a water pump 400 are installed on the rear portion of the housing 100, and a rear upper opening 100B and a rear lower opening 100A are provided on the rear portion of the housing 100, and the control board 500 is installed in the rear upper opening 100A, and the water pump 400 is installed in the rear lower opening 100B; the front portion of the housing 100 is provided with a wiring cavity 200A with an opening, and the wiring cavity 200A is used to accommodate one end of a spring needle group electrically connected to the water pump 400 and the control board 500, The other end of the spring needle group is electrically connected to the power supply assembly 50 of the scrubbing device, and the power supply assembly 50 provides power for the control board 500, the water pump 400, and the drive motor (not shown in the drawings) of the scrubbing head; the end of the shell frame 100 close to the scrubbing head is in an open state, and the end of the shell frame 100 away from the scrubbing head is a power supply opening (not shown in the drawings). After the control board 500 and the water pump 400 are installed, the shell frame 100 is installed on the bottom shell 21 of the scrubbing device; the upper and lower sides of the rear part of the shell frame 100 are hollow, forming an open space, and the open space provides good heat dissipation conditions for the control board 500 and the water pump 400; the end cover assembly 200 includes an end cover 205 and a spring needle group installed on the end cover 205, the other end of the spring needle group extends out of the wiring cavity 200A to elastically abut the output end of the power supply assembly 50; the power-taking opening of the housing 100 is detachably sealed and connected to the end cover 205, surrounding the wiring cavity 200A, and the upper and lower sides of the other end of the housing 100 are open, and the water pump 400 is installed in the rear lower opening 100A of the housing 100, and the water pump 400 includes a water inlet and outlet end (not marked in the drawings) and a power connection end (not marked in the drawings); the water inlet and outlet end has a water inlet 401 and a water outlet 402, and the power connection end has two wiring electrodes (not marked in the drawings); the water inlet 401 of the water inlet and outlet end of the water pump , the water outlet 402 is connected to the cleaning head of the cleaning device through a pipeline, and the clean water in the water tank assembly 40 is sent to the surface of the cleaning roller 30 of the cleaning head and the sewage after the cleaning roller 30 scrubs the surface to be cleaned is sucked back to the water tank assembly 40. The sewage is filtered into clean water in the water tank assembly 40 and then sent out to the surface of the cleaning roller 30 again, and this cycle repeats; the end cover 205 is detachably sealed and connected to the shell frame 100, and the end cover 205 is powered and communicated with the outside through the spring needle group; the water pump assembly 10 can be installed on the bottom shell 21 of the cleaning device and then the upper shell 22 of the cleaning device is covered to complete the installation of the water pump assembly 10 in the cleaning device. When the power supply assembly 50 is installed to the scrubbing device, the power supply assembly 50 is electrically connected to the water pump assembly 10.

[0069] Specifically, as shown in Figure 1, Fig. 9 , Fig.10 As shown, the power contact 1 and the power contact 2 (not shown in the drawing) provided at the power connection end of the water pump 400 can be conveniently passed through the cable from the rear lower opening 100A into the wiring cavity 200A to be electrically connected to the spring needle group so that the power supply assembly 50 can provide power for the water pump 400. At the same time, since the upper and lower sides of the rear of the shell frame 100 are open, the control board 500 can naturally and conveniently use the open space to pass through the cable from the rear upper opening 100B into the wiring cavity 200A to be electrically connected to the spring needle group so that the power supply assembly 50 can provide power. At the same time, the power contact 1 and the power contact 2 of the water pump 400 are electrically connected through the cable, so that the control board 500 can control the operation of the water pump 400 under the premise that the power supply assembly 50 provides sufficient power. When the water pump 400 fails, the open shell frame 100 can also be used to conveniently observe the conditions of the cables connecting the water pump 400, the control board 500, the wiring cavity 200A, and the spring needle group, so that the user can observe whether the cables, the electrical connection points, and the control board have large current ablation, and can also directly observe the conditions of the control system, so that the maintenance personnel or users can make corresponding maintenance diagnosis and analysis. The open shell frame 100 helps the maintenance personnel or users to directly disassemble the assembly of the water pump 400 and the shell frame 100 when the water pump assembly fails, and directly feel the temperature of the surface of the water pump 400 shell by hand, so as to indirectly judge whether the water pump 400 has been working in a high temperature environment for a long time before the failure, so that the maintenance personnel or users can make corresponding maintenance diagnosis and analysis. The shell of the water pump 400 is usually made of metal material, and a certain hollow space is reserved, which also helps the water pump 400 to dissipate heat to the environment by radiation plus air convection, which is conducive to extending the service life of the water pump 400.

[0070] In the embodiment of the water pump assembly of the present invention, the shell frame is used to fix the water pump in an open manner between the shell frame and the bottom shell of the cleaning device, so that the shell frame and the bottom shell of the cleaning device can play a certain supporting role when subjected to force, prevent the running water pump from being impacted by external forces, and extend the service life. At the same time, the upper and lower openings of the rear part of the shell frame are H-shaped cross-sectional structures, on the one hand, convenient for the water pump to be electrically connected to the control system, and on the other hand, the water pump and the control system have sufficient open heat dissipation space, and the open installation space makes it more convenient for the water inlet and outlet of the water pump to be connected to the pipeline for external extraction and water delivery. The telescopic direction of the elastic needle group installed on the end cover of the water pump assembly forms an acute angle with the water inlet and outlet direction of the water pump, so that the water pump assembly can stably achieve elastic power supply abutment and direct abutment of signal transmission with the power supply assembly in the handle of the scrubbing device, and provide sufficient strength support for the entire scrubbing device at the corner where the handle and the fuselage meet, so that the user can hold the handle with one hand / or two hands to hold the scrubbing device to clean the surface to be cleaned.

[0071] In one or some optional embodiments, as shown in FIG. 4, FIG. 7, FIG. 8, Fig. 9 As shown, a partition 109 is provided at one end of the housing 100 close to the power-taking opening to divide the housing 100 into a front part and a rear part; a wire hole 104 is provided on the partition, and the control board 500 is electrically connected to the spring needle group through a wiring harness (not shown in the drawing) passing through the wire hole 104.

[0072] In one or some optional embodiments, as shown in FIGS. 3, 7 to Fig.10 As shown, the longitudinal section of the rear portion of the housing frame 100 is H-shaped, the rear upper opening is used to accommodate the control board 500 , and the rear lower opening 100A is used to accommodate the water pump 400 .

[0073] In one or some optional embodiments, as shown in FIGS. 3, 7 to Fig.10 As shown, the end cover 205 seals the opening at the front of the housing 100 to prevent water from entering the wiring chamber 200A through the end cover 205, and also prevents water from directly passing through the gap between the bottom shell 21 and the power supply assembly 50 at the handle of the cleaning device through the front of the housing 100 to reach the rear of the housing 100, thereby preventing water from entering the interior of the cleaning device from affecting the normal operation of the control board 500 and the water pump 400.

[0074] In one or some optional embodiments, as shown in FIGS. 3, 7 to Fig.10 As shown, the spring pin group 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 respectively connected to the positive pole of the output end of the power supply component 50 and the positive power supply of the control board 500; the negative electrode spring pin 202 is respectively connected to the negative pole of the output end of the power supply component 50 and the negative power supply of the control board 500; the communication positive spring pin 203 is respectively connected to the communication positive pin of the output end of the power supply component 50 and the control board 500; the communication negative spring pin 204 is respectively connected to the output end of the power supply component 50 and the communication negative pin of the control board 500.

[0075] The elastic needle assembly can conveniently realize the elastic and reliable electrical connection between the water pump assembly and the power supply assembly of the cleaning device, so that the cleaning device can still maintain the reliable electrical connection between the power supply assembly and the water pump assembly even when it is subjected to external impact, ensuring that the cleaning device will not stop running due to external impact. The elastic needle assembly has sufficient elastic expansion redundancy to ensure that when the water pump assembly of the cleaning device has a relative displacement within a certain value with the power supply assembly (when the relative displacement value is less than the expansion amount of the elastic needle assembly), the power supply assembly and the water pump assembly can maintain a reliable electrical connection.

[0076] In one or some optional embodiments, as shown in FIGS. 1 to 5, 7, Fig. 9 , Fig.10As shown, the two side walls of the rear lower opening of the housing frame 100 extend outward with fixing ears 102 respectively, so as to fix the housing frame 100 on the bottom shell 21. The fixing ears 102 are detachably connected to the bottom shell 21 of the scrubbing device. When the user needs to maintain the water pump assembly 10, he only needs to remove the upper shell 22 of the scrubbing device from the bottom shell 21 of the scrubbing device, and then continue to 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 shell 21 of the scrubbing device. The L-shaped hanging ears 102 are arranged on the two side walls of the rear lower opening of the housing frame 100, and its structure itself has a certain ability to absorb stress and strain. After the housing frame 100 is installed with the water pump 400 and the control board 500, even if the entire water pump assembly is subjected to a certain external force impact, the L-shaped hanging ears 102 can also well absorb the stress and strain generated by the external force impact to ensure the stable operation of the water pump 400 and the control board 500.

[0077] In one or some optional embodiments, as shown in FIGS. 1 to 3, 6, Fig. 9 , Fig.10 As shown, a plurality of weight-reducing holes 106 are provided on both side walls of the rear lower opening of the shell frame 100. The weight-reducing holes help the water pump to dissipate heat. The weight-reducing holes also help other non-hollow parts of the shell frame 100 to be more efficiently formed by injection molding during the manufacturing process, which is beneficial to improving the overall rigidity of the entire shell frame 100 while reducing the total weight.

[0078] In one or some optional embodiments, as shown in FIG. 1, FIG. 5, FIG. 6, Fig. 9 , Fig.10 As shown, the housing frame 100 has a plurality of reinforcing ribs 101 extending from top to bottom from the root of the lower rear opening between the partition 109 and the power connection end of the water pump 400. The height of the reinforcing ribs 101 extending downward is flush with the outer cylindrical surface of the power connection end of the water pump 400. A gap is left between the reinforcing ribs 101 and the two power connection electrodes of the power connection end 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 frame 100 in the axial direction of the water pump 400, and can further reduce the weight of the entire housing frame 100.

[0079] In one or some optional embodiments, as shown in FIG. 1, FIG. 5, FIG. 6, Fig. 9 , Fig.10As shown, as required, the shell frame 100 is further provided with reinforcing ribs for increasing the strength and reducing the weight, and reinforcing ribs 105 are extended outward from the two side walls of the rear lower opening of the shell frame 100 near the reinforcing ribs 101, and the ends of the reinforcing ribs 105 and the reinforcing ribs 101 are adapted to the columnar outer surface of the water pump 400, and 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 impact. The reinforcing ribs 105 can increase the overall strength of the part of the shell frame 100 that transitions from the front to the rear, and can also further reduce the weight of the entire shell frame 100.

[0080] In one or some optional embodiments, as shown in FIG. 2, FIG. 3, FIG. 7, and FIG. 8, a nut column (not shown in the drawings) is provided in the rear upper opening of the housing frame 100, and a support column (not shown in the drawings) is provided on the surrounding walls of the rear upper opening, and the support column supports the control board 500, and the control board 500 can be fixed in the rear upper opening 100B by screws. The nut column and the support column can provide a good fulcrum for the control board 500 when it is installed in the rear upper opening 100B, and can prevent the control board 500 from shaking arbitrarily in the rear upper opening 100B, which may cause the electrical connection between the control board 500 and the water pump 400 and the spring needle group to fail, and can prevent the components on the control board 500 from failing due to shaking.

[0081] In one or some optional embodiments, as shown in Figures 2, 3, 7, and 8, a step (not shown in the drawings) is provided in the rear upper opening of the housing 100, and the side of the step away from the partition 109 is higher than the side closer to the partition 109, so that the rear lower opening of the housing 100 has more space to accommodate the water pump 400.

[0082] A step is provided in the rear upper opening of the housing frame 100, and the step also divides the space of the rear lower opening of the housing frame 100 into two parts of different volumes in front and back. The step makes it easier to snap-fit ​​the water pump 400 into the space of the rear lower opening of the housing frame 100. The step can be used to abut against and absorb the impact received by the water pump 400 along the axial direction of the water pump, so as to utilize the snap-fit ​​connection between the entire housing frame 100 and the bottom shell 21 of the cleaning device to absorb the impact, which is more conducive to prolonging the service life of the water pump. On the other hand, a gap is provided between the other parts of the housing frame 100 and the water pump 400. The gap between the two parts can not only absorb the impact of large external forces by utilizing the elastic deformation of the shell frame 100 and / or the bottom shell 21 when the shell frame at a specific position is subjected to large external forces, but also transmit a certain force, thereby increasing the strength of the outer shell of the entire water pump assembly 10, and preventing the impact of the external force from being transmitted to the water pump 400 through the shell frame 100 and the bottom shell 21 when the entire water pump assembly 10 is subjected to large external forces, thereby avoiding damage to the water pump; at the same time, the open shell frame 100 also helps the water pump 400 of the water pump assembly 10 to dissipate heat outward in time when running at high speed.

[0083] In this way, a gap is provided between other parts of the shell frame and the water pump, a gap is provided between other parts of the shell frame and the control board, and a gap is provided between the bottom shell of the cleaning device and a part of the shell frame. These gaps can not only utilize the elastic deformation of the shell frame and / or the bottom shell to absorb the impact of these external forces when the shell frame at a specific position is subjected to a large external force, but also transmit a certain force and transmit these external force impacts to other parts of the cleaning device that cooperate with the water pump assembly. This can not only increase the strength of the outer shell of the entire water pump assembly, but also prevent the impact of external forces from being transmitted to the water pump and the control board through the shell frame and the bottom shell when the entire water pump assembly is impacted by a large external force, thereby avoiding damage to the water pump and the control board.

[0084] In a specific embodiment, as shown in FIGS. 1 to 2, 8 to Fig.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 power connection terminal and a second space (not shown in the figure) for fixing the water inlet and outlet terminals, and the radial size of the first space is not equal to that of the second space. Since the maximum outer diameter of the power connection terminal of the water pump 400 is not equal to the maximum outer diameter of the water inlet and outlet terminals, it is also convenient for the user to conveniently insert the water pump 400 into the space of the rear lower opening of the housing 100 using the step, and vice versa, it is also convenient for the user to remove the water pump 400 from the space of the rear lower opening of the housing 100.

[0085] In this way, the step divides the space of the rear lower opening of the shell frame into a first space for accommodating the power connection end and a second space for fixing the water inlet and outlet ends, so that the space of the rear lower opening of the shell frame can be conveniently adapted to water pumps of various shapes, thereby improving the efficiency and convenience of installing the water pump in the space of the rear lower opening of the shell frame.

[0086] In one or some optional embodiments, as shown in FIGS. 1 to 3, 5 to Fig.10 As shown, at least one sealing ring snap-in groove 108 is provided on the outer side of the peripheral wall of the front part of the housing frame 100, as shown in FIG8, the sealing ring snap-in groove 108 is used to snap-in a sealing ring 108', so as to achieve 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 of the scrubbing device and the upper shell 22 of the scrubbing device.

[0087] In this way, the water pump assembly provided by the present invention allows the shell frame, water pump, control panel, and end cover to be installed and combined with each other, which can play a certain supporting role when subjected to force to prevent the running water pump from being impacted by external forces, thereby extending the service life. At the same time, the shell frame and end cover also make it more convenient for the water pump to obtain electricity from the outside and connect to the control panel. The open shell frame makes it more convenient for the water pump to connect to the pipeline for external extraction and water delivery. The open shell frame can further realize the quick and detachable connection between the water pump and the control panel on the shell frame, further reducing the difficulty of assembling the water pump assembly, and also improving the convenience of users in maintaining the water pump assembly.

[0088] In a specific embodiment, the control system is provided with a positive lead-out point, a negative lead-out point, a water pump power supply lead-out point one, a water pump power supply lead-out point two, a communication positive lead-out point, and a communication negative lead-out point (not marked in the drawings); the positive electrode spring pin 201 is electrically connected to the positive lead-out point, and the negative electrode spring pin 202 is electrically connected to the negative lead-out point; the electrical contact one is electrically connected to the water pump power supply lead-out point one, and the electrical contact two is electrically connected to the water pump power supply lead-out point two; the communication positive spring pin 203 is electrically connected to the communication positive lead-out point, and the communication negative spring pin 204 is electrically connected to the communication negative lead-out point.

[0089] In this way, 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 realizes the 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 needle group on the end cover assembly 200. This electrical connection includes power connection and signal connection.

[0090] In a specific embodiment, as shown in FIGS. 1 to 2, 8 to Fig.10As shown, the spring needle group may include at least 4 groups of spring needles, which are respectively a positive electrode spring needle 201, a negative electrode spring needle 202, a communication positive spring needle 203, and a communication negative spring needle 204; the positive electrode spring needle 201 is respectively connected to the positive pole of the output end of the power supply component 50 and the positive power supply of the control board 500; the negative electrode spring needle 202 is respectively connected to the negative pole of the output end of the power supply component 50 and the negative power supply of the control board 500; the communication positive spring needle 203 is respectively connected to the communication positive pin of the output end of the power supply component 50 and the control board 500; the communication negative spring needle 204 is respectively connected to the output end of the power supply component 50 and the communication negative pin of the control board 500. Each elastic needle of the elastic needle group specifically includes a protruding needle tip, a cylindrical needle body, and an electrical connection tail (not shown in the drawings) for welding or crimping cables. The cylindrical needle body extends out of the end surface of the outer surface of the end cover 205 facing outward. The protruding needle tip can be installed in the cylindrical needle body and extend or retract along the axis of the cylindrical needle body under the elastic force of the elastic member to achieve electrical connection with the output end of the power supply assembly 50. The extension direction of the protruding needle tip is not in the same straight line as the end surface normal of the water inlet and outlet of the water pump 400.

[0091] In a specific embodiment, further, as shown in FIG. 8 to FIG. Fig.10 As shown, the extension and retraction direction of the elastic needle assembly forms an acute angle with the end surface normal of the water inlet and outlet ends of the water pump 400.

[0092] Specifically, as shown in FIG8 , the extension direction of the elastic needle group forms an acute angle with the axial direction of the water pump 400. The end faces of the water inlet and outlet ends of the water pump 400 are just perpendicular to the axial direction of the water pump 400, so the extension direction of the elastic needle group forms an acute angle α with the normal of the end faces of the water inlet and outlet ends of the water pump 400. Preferably, the value range of the acute angle α is 5 to 60 degrees. As shown in Figure 3, when the value of the acute angle α is 5 degrees, the exposed spring needle group of the end cover 205 of the water pump assembly is only slightly tilted to point to 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 arranged in the gripping handle of the scrubbing device. In this way, the gripping handle of the scrubbing device is just slightly tilted to connect the entire scrubbing device body, and the water pump assembly 10 is just at the connection point where the power supply assembly 50 in the gripping handle and the water tank assembly 40 of the scrubbing device body are connected. The concentrated water pump assembly just provides a strong connection bearing strength to the gathering point of the entire scrubbing device body. When the value of the acute angle α is 5 degrees, the inclination angle of the handle and the scrubbing device body is just enough for the user to slightly lift the handle to allow the cleaning roller of the scrubbing device to easily elastically abut on the surface to be cleaned, so that the user can conveniently hold the scrubbing device with one hand / or two hands to clean the surface to be cleaned. When the acute angle α is 60 degrees, the handle and the scrubbing device body are as shown in Figures 11, Fig.12 The turning angle shown is 60 degrees, and the length of the body part is equal to the length of the handle part, so that the user can hold the scrubbing device and slightly lift the handle to allow the cleaning roller of the scrubbing device to easily and elastically abut against the surface to be cleaned, so that the user can conveniently hold the scrubbing device with one hand / or two hands to clean the surface to be cleaned. Since the length of the body part is equal to the length of the handle part, the angle of 60 degrees between the two can allow the water pump assembly at the corner where the two meet to provide sufficient connection strength for the entire scrubbing device, and 60 degrees is an angle that users can generally accept for viewing the corner of daily scrubbing devices, which can make people visually feel that the strength is sufficient, so that users can more assuredly and calmly use the scrubbing device to clean the surface to be cleaned by holding the handle.

[0093] In this way, the contraction direction of the elastic needle assembly and the water inlet and outlet direction of the water pump form an acute angle, which allows the water pump assembly to stably achieve elastic power supply contact with the battery assembly in the handle of the scrubbing device, providing sufficient strength support for the entire scrubbing device at the corner where the handle and the body meet, making it convenient for the user to hold the handle with one hand / or two hands to hold the scrubbing device to clean the surface to be cleaned. Since the other end of the water pump assembly away from the scrubbing head of the scrubbing device is provided with an end cover, the elastic needle assembly exposed from the end cover is close to the output end of the battery assembly in the handle, so that the water inlet and outlet of the water pump are close to the scrubbing head, thereby making the distribution of the water pipeline and the power supply power line more concise, making the overall structure of the scrubbing device compact. At the same time, the water pump assembly is formed with two fixed surfaces at both ends through different components, so that the water pump assembly can play a certain supporting role on the shell frame when subjected to force, thereby extending the service life of the overall structure of the entire scrubbing device.

[0094] The present invention also provides an embodiment of a scrubbing device.

[0095] Specifically, as shown in Figure 11, Fig.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, wherein the water pump assembly 10 transports clean water from the water tank assembly 40 to the cleaning roller 30 on the scrubbing head, wherein the water pump assembly 10 includes a housing frame 100 and a water pump 400 and a control panel 500 mounted on the housing frame 100, wherein an end cover 205 is provided at the other end of the housing frame 100 away from the scrubbing head, and a spring needle group connected to the control system signal that controls the operation of the water pump is provided between the end cover 205 and the housing frame 100.

[0096] Specifically, the scrubbing device includes an upper shell 22, and the upper shell 22 is also provided with a water tank locking mechanism 221, which includes an unlocking button 2211 and a push rod 2212 engaged with the unlocking button 2211, a locking rod 2214 slidably engaged with the push rod 2212, and a spring 2213 engaged 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 realize the quick fixation of the water tank assembly 40 on the upper shell 22 of the scrubbing device, and further lock / unlock the fixation of the water tank 40 on the upper shell 22 of the scrubbing device. Pressing the unlocking button 2211 can push the locking rod 2214 backwards, thereby further releasing the locking state of the water tank assembly 40.

[0097] The embodiment of the scrubbing device of the present invention reduces the difficulty of arranging the internal control circuit and the water pump suction and clean water delivery pipelines of the scrubbing device, improves the vibration resistance of the water pump assembly inside the scrubbing device, and at the same time ensures space and open area for external heat dissipation of the water pump, thereby extending the service life of the built-in water pump of the scrubbing device and improving the overall structural rigidity of the scrubbing device.

[0098] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some structures (technical features) in one or more embodiments may be replaced or combined by equivalent means, and these modifications or replacements or combinations do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, unless the embodiments explicitly exclude the possibility of replacing or combining structures (technical features) in different embodiments, or such replacement or combination is contrary to the overall concept of the invention.

Claims

1. A water pump assembly, mounted on a scrubbing device having a scrubbing head, characterized in that: include: The housing frame has a control panel and a water pump installed at the rear thereof, and a wiring chamber is provided at the front thereof, wherein the wiring chamber is used to accommodate one end of a spring needle group electrically connected to the water pump and the control panel, and the other end of the spring needle group is electrically connected to a power supply assembly of the scrubbing device, and the power supply assembly provides power for a driving motor of the control panel, the water pump, and the scrubbing head; A water pump, comprising a water inlet and outlet end and an electrical connection end, wherein the water inlet and outlet end are connected to the scrubbing head through a pipeline, and the electrical connection end is electrically connected to the control board; An end cover assembly, comprising an end cover covering the front of the housing and the spring pin assembly mounted on the end cover, the other end of the spring pin assembly extending out of the wiring cavity to elastically abut against the output end of the power supply assembly; Wherein, the scrubbing device comprises an upper shell and a bottom shell, wherein the upper shell and the bottom shell seal the water pump assembly inside the scrubbing device, and when the power supply assembly is installed to the scrubbing device, the power supply assembly is electrically connected to the water pump assembly; Preferably, the front portion of the housing frame is provided with an opening, and the end cover sealing cover is provided at the opening to form the wiring cavity, so as to prevent water from entering the wiring cavity through the end cover, and also prevent water from directly passing through the front portion of the housing frame to reach the rear portion of the housing frame; Preferably, a partition is provided at one end of the housing frame close to the opening to divide the housing frame into a front part and a rear part, and a wire hole is provided on the partition, and the control board is electrically connected to the spring needle group through a wire harness passing through the wire hole; Preferably, the rear portion has upper and lower openings and an H-shaped cross section, wherein the upper rear opening is used to accommodate the control panel, and the lower rear opening is used to accommodate the water pump.

2. The water pump assembly according to claim 1, characterized in that: The elastic needle group comprises: A positive electrode spring needle is connected to the positive electrode of the output end and the positive power supply of the control board respectively; Negative electrode spring needles are respectively connected to the negative electrode of the output end and the negative power supply of the control board; A communication positive pin is electrically connected to the output terminal and the communication positive pin of the control board respectively; The communication negative spring pin is electrically connected to the output end and the communication negative pin of the control board respectively.

3. The water pump assembly according to claim 1, characterized in that: The two side walls of the rear lower opening of the shell frame are respectively extended outwards with fixing ears so as to fix the shell frame on the bottom shell.

4. The water pump assembly according to claim 1, characterized in that: A plurality of weight-reducing holes are also provided on both side walls of the rear lower opening of the housing frame, and the weight-reducing holes are helpful for heat dissipation of the water pump.

5. The water pump assembly according to any one of claims 1 to 4, characterized in that: The shell frame has a plurality of reinforcing ribs extending from the root of the lower opening of the rear portion from top to bottom between the partition and the water pump power connection terminal, the height of the reinforcing ribs extending downward is flush with the outer cylindrical surface of the water pump power connection terminal, and a gap is left between the reinforcing ribs and the two power connection electrodes of the water pump power connection terminal to facilitate the electrical connection of the two power connection electrodes to the control board; Preferably, reinforcing ribs are extended outward from the two side walls of the rear lower opening of the housing near the reinforcing ribs, and 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.

6. The water pump assembly according to claim 1, characterized in that: A nut column is arranged in the rear upper opening, and supporting columns are arranged on the surrounding walls of the rear upper opening. The supporting columns support the control panel, and the control panel can be fixed in the rear upper opening by screws.

7. The water pump assembly according to claim 6, characterized in that A step is arranged in the rear upper opening, and a side of the step away from the front portion is higher than a side closer to the front portion, so that the rear lower opening has more space to accommodate the water pump.

8. The water pump assembly according to claim 1, characterized in that The extension and retraction direction of the elastic needle group is not in the same straight line as the water inlet and outlet direction of the water pump.

9. The water pump assembly according to claim 8, characterized in that The extension and retraction direction of the electrode cap forms an acute angle with the water inlet and outlet direction of the water pump.

10. A scrubbing device, characterized in that: It comprises a handle and a scrubbing head connected to the handle, a water tank and a water pump assembly as claimed in any one of claims 1 to 9, The water pump assembly delivers clean water in the water tank to the cleaning roller on the scrubbing head.

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