Automatic cleaning device for pool

Abstract

The utility model relates to the technical field of cleaning devices, and provides an automatic pool cleaning device which comprises a filtering unit, a cleaning unit and a cleaning unit. The first water pump unit is used for driving water flow to flow into the filtering unit and flow out through the first filtering element; the flushing assembly is used for flushing at least part of the first filtering element of the filtering unit, and the flushing assembly comprises a water spraying bin arranged on the outer side of the filtering unit; the second water pump unit is used for driving water flow to enter the water spraying bin and pressurizing the water flow, so that the water flow flows into the filtering unit through the first filtering element after being sprayed out of the water spraying bin.

Description

Technical Field

[0001] This application relates to the field of cleaning device technology, and in particular to an automatic cleaning device for water tanks. Background Technology

[0002] As people's requirements for swimming pool water quality continue to increase, automatic pool cleaning devices, as a type of equipment capable of automating pool cleaning, have gradually gained widespread application. Existing automatic pool cleaning devices are typically equipped with a trash basket or filter screen to collect floating debris, sediment, and fine particulate matter from the water. During operation, the water flow carries the debris into the trash basket, where the mesh filters and traps it, thus achieving water filtration and cleaning.

[0003] However, the design of the trash baskets in commonly available automatic sink cleaning devices on the market has certain flaws. After the automatic sink cleaning device has been running for a period of time, a large amount of trash and impurities accumulate on the mesh surface of the trash basket due to the continuous filtration of water. This trash often adheres to the mesh surface of the trash basket, gradually forming a blockage, which obstructs the water flow channel, weakens the suction power of the automatic sink cleaning device, significantly reduces its filtration capacity, and noticeably decreases its filtration efficiency. Utility Model Content

[0004] This application addresses the shortcomings of the prior art by providing an automatic water tank cleaning device. The automatic water tank cleaning device includes: a filtration unit including a first filter element; a first water pump unit for driving water flow into the filtration unit and out through the first filter element; and a rinsing assembly for rinsing at least a portion of the first filter element of the filtration unit. The rinsing assembly includes: a spray chamber disposed outside the filtration unit; and a second water pump unit for driving water flow into the spray chamber and pressurizing the water flow so that the water flow sprays out from the spray chamber and flows into the filtration unit through the first filter element.

[0005] Furthermore, the filtration unit also includes a waste storage compartment, which is provided with a door. The door allows water and debris from the filtration unit to enter the waste storage compartment. When the second water pump unit is working, the door is in an open state, and when the first water pump unit is working, the door is in a closed state.

[0006] Furthermore, the waste storage bin includes a second filter element, the water spray bin is connected to the waste storage bin, and the second water pump unit drives the water in the waste storage bin to flow into the water spray bin through the second filter element.

[0007] Furthermore, the waste storage bin also includes an outer shell that surrounds the second filter element, a bin door is disposed on the outer shell, and the outer shell is also provided with an opening communicating with the water spray bin.

[0008] Furthermore, the waste storage compartment is detachable from the filter unit.

[0009] Furthermore, the filtration unit includes a water inlet, which is closed when the second water pump unit is operating and open when the first water pump unit is operating.

[0010] Furthermore, the water spray chamber is located at least between the filter unit and the first water pump unit.

[0011] Furthermore, the water spray chamber includes a water spray nozzle, which is positioned toward the filter unit.

[0012] Furthermore, the spray chamber includes a plurality of water flow holes for water flowing out from the first filter element to pass through.

[0013] Furthermore, during a cleaning cycle, the ratio of the working time of the first water pump unit to the working time of the second water pump unit of the automatic water tank cleaning device ranges from 20:1 to 30:1.

[0014] The embodiments described in this application have the following beneficial effects:

[0015] In this embodiment, the water flow in the spray chamber can flow into the filter unit from the outside of the filter unit through the first filter element under the drive of the second water pump unit. That is, at least part of the first filter element, the water flow direction sprayed from the spray chamber is opposite to the water flow direction driven by the first water pump unit. The water flow sprayed from the spray chamber can reverse the flow to clean at least part of the first filter element, so as to wash away the debris attached to the first filter element, reduce the occurrence of debris attached to the first filter element and causing water flow blockage, thereby reducing the interference with the suction of the first water pump unit and improving the filtration capacity and cleaning efficiency of the automatic water tank cleaning device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are merely exemplary embodiments of this application.

[0017] Figure 1 This is a cross-sectional structural schematic diagram showing an embodiment of an automatic water tank cleaning device according to this application;

[0018] Figure 2This is a schematic diagram illustrating the structure of a rinsing assembly according to an embodiment of this application;

[0019] Figure 3 This is a cross-sectional structural schematic diagram illustrating another embodiment of the automatic water tank cleaning device of this application;

[0020] Figure 4 This is a cross-sectional structural schematic diagram showing an automatic water tank cleaning device according to another embodiment of this application.

[0021] 100. Filter unit; 110. First filter element; 111. Filter space; 120. Waste storage compartment; 121. Compartment door; 122. Second filter element; 123. Outer shell (first outer shell); 124. Storage space; 125. Flow channel; 130. Water inlet;

[0022] 200. First water pump unit;

[0023] 300, Flushing assembly; 310, Spray chamber; 311, Spray nozzle; 312, Water flow hole; 320, Second water pump unit; 400, Second housing. Detailed Implementation

[0024] The technical solutions in this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0025] This application provides an automatic pool cleaning device capable of cleaning pools. The pool is, for example, a pool-shaped structure. This pool-shaped structure can be a swimming pool, a water storage tank, a spa pool, a water tank, a water storage trough, etc. The automatic pool cleaning device can be a device such as an automatic cleaning device or a pool cleaning robot, capable of cleaning the pool-shaped structure. This application does not limit the specific presentation of the automatic pool cleaning device or the pool-shaped structure, as long as the principle of this application is achieved. In the following description, unless otherwise specified, a robot will be used as an example of the automatic pool cleaning device, and a swimming pool will be used as an example of a pool or pool-shaped structure.

[0026] The automatic water tank cleaning device provided in this application includes: a filtration unit 100, including a first filter element 110; a first water pump unit 200, used to drive water flow into the filtration unit 100 and out through the first filter element 110; a rinsing assembly 300, the rinsing assembly 300 being used to rinse at least a portion of the first filter element 110 of the filtration unit 100, the rinsing assembly 300 including: a spray chamber 310, the spray chamber 310 being disposed on the outside of the filtration unit 100; and a second water pump unit 320, used to drive water flow into the spray chamber 310 and pressurize the water flow, so that the water flow sprays out from the spray chamber 310 and flows into the filtration unit 100 through the first filter element 110.

[0027] The automatic water tank cleaning device and its components described above will now be described in detail with reference to the accompanying drawings. Figure 1 This is a cross-sectional structural schematic diagram showing an embodiment of an automatic water tank cleaning device according to this application; Figure 2 This is a schematic diagram illustrating the structure of a rinsing assembly according to an embodiment of this application; Figure 3 This is a cross-sectional structural schematic diagram illustrating another embodiment of the automatic water tank cleaning device of this application; Figure 4 This is a cross-sectional structural schematic diagram showing an automatic water tank cleaning device according to another embodiment of this application.

[0028] like Figure 1 As shown, the automatic water tank cleaning device includes a filter unit 100 and a first water pump unit 200. The filter unit 100 includes a first filter element 110. The first water pump unit 200 can drive water to flow into the filter unit 100 and out through the first filter element 110. Debris and other debris in the water can be retained in the first filter element 110 when passing through it, thereby collecting various types of garbage and debris (such as branches, leaves, paper scraps, insects, plastic pieces, etc., hereinafter referred to as "debris and debris") in the water tank and achieving the purpose of cleaning the water tank. Furthermore, when the first water pump unit discharges water from the automatic water tank cleaning device, the automatic water tank cleaning device can receive a reaction force from the direction of water discharge, which can provide driving force or downward pressure for the movement of the automatic water tank cleaning device.

[0029] like Figure 1 and Figure 2As shown, the automatic water tank cleaning device also includes a flushing assembly 300. The flushing assembly 300 includes a spray chamber 310 and a second water pump unit 320, wherein the spray chamber 310 is located outside the filter unit 100. The second water pump unit 320 drives water flow into the spray chamber 310 and pressurizes the water flow, causing the water to spray out of the spray chamber 310 and flow into the filter unit 100 through at least a portion of the first filter element 110, thereby achieving the purpose of flushing at least a portion of the first filter element 110 of the filter unit 100. The first filter element 110 can be configured in various shapes such as cylindrical or rectangular, as long as it can achieve the function of filtering garbage fragments.

[0030] Therefore, the water flow in the spray chamber 310 can flow into the filter unit 100 from the outside of the filter unit 100 through at least a portion of the first filter element 110. At at least a portion of the first filter element 110, the water flow direction sprayed out of the spray chamber 310 is opposite to the water flow direction driven by the first water pump unit 200. The water flow sprayed out of the spray chamber 310 can backwash at least a portion of the first filter element 110 to wash away various kinds of garbage and debris attached to the first filter element 110 (e.g., its inner wall), reducing the occurrence of various kinds of garbage and debris attached to the first filter element 110 and causing water flow blockage, thereby reducing interference with the suction of the first water pump unit 200 and improving the filtration capacity and cleaning efficiency of the automatic water tank cleaning device.

[0031] like Figure 2 and Figure 3 As shown, the water spray chamber 310 includes a water spray nozzle 311, which is disposed toward the filter unit 100. Thus, the water spray chamber 310 can spray water toward the filter unit 100 through the water spray nozzle 311 to rinse at least a portion of the first filter element 110 of the filter unit 100. Figure 3 As shown, the water spray chamber 310 can rinse the right side of the first filter element 110 through the water spray nozzle 311.

[0032] For example, such as Figure 3 and Figure 4 As shown, the filter unit 100 includes an inlet 130. A first filter element 110 encloses a filter space 111, and the inlet 130 communicates with the filter space 111. When the first pump unit 200 is operating, the inlet 130 is open. This allows water and various types of debris and fragments carried within it to flow into the filter space 111 through the inlet 130. The water then flows out of the filter space 111 after passing through the first filter element 110, and the debris and fragments are filtered and contained within the filter space 111. During the operation of the first pump unit 200, the second pump unit 320 can remain closed.

[0033] When the second water pump unit 320 is working, the inlet 130 is closed. Therefore, when the second water pump unit 320 drives water to flow through the spray chamber 310 to rinse at least part of the first filter element 110, it can reduce the occurrence of water flowing into the filter space 111 carrying debris and other debris out through the inlet 130, thus reducing the leakage of debris and improving the cleaning efficiency of the automatic water tank cleaning device.

[0034] For example, a cover is provided at the water inlet 130, which can close or open the water inlet 130. It should be noted that in this embodiment, the cover can be opened and closed in a controlled manner according to the working state of the first water pump unit 200 and the second water pump unit 320, or by the combined action of the water pressure in the filter space 111 and the weight of the cover itself when the first water pump unit 200 and the second water pump unit 320 are working, or by technical means well known to those skilled in the art. As long as it can be achieved that the water inlet 130 is in an open state when the first water pump unit 200 is working and in a closed state when the second water pump unit 320 is working, the specific opening and closing method of the water inlet 130 is not specifically limited here.

[0035] During a cleaning cycle, the ratio of the working time of the first water pump unit 200 to the working time of the second water pump unit 320 of the automatic water tank cleaning device can range from 20:1 to 30:1.

[0036] For example, the ratio of the working time of the first water pump unit 200 to the working time of the second water pump unit 320 is 20:1, 21:1, 22:1, 23:1, 24:1, 25:1, 26:1, 27:1, 28:1, 29:1 or 30:1.

[0037] In this embodiment, the operation of the first water pump unit 200 corresponds to the automatic water tank cleaning device being in the cleaning and filtration state, while the operation of the second water pump unit 320 corresponds to the backwashing stage, which is the stage of cleaning at least part of the first filter element 110. The ratio of the operating time of the first water pump unit 200 to the operating time of the second water pump unit 320 ranges from 20:1 to 30:1. This reduces the amount of debris and grime clogging the first filter unit 100 and also reduces the possibility of over-cleaning of the first filter element 110 by the second water pump unit, thus achieving a reasonable allocation between "cleaning the water tank" and "cleaning the first filter element," preventing excessively low water tank cleaning efficiency.

[0038] like Figure 3 As shown, the filter unit 100 may also include a waste storage bin 120, which is provided with a bin door 121. The bin door 121 allows water flow and various types of waste and debris in the filter space 111 to enter the waste storage bin 120.

[0039] When the second water pump unit 320 is operating, the compartment door 121 is open. Thus, when the second water pump unit 320 operates and flushes at least part of the first filter element 110, the water flowing into the filter space 111 can carry various types of garbage and debris through the compartment door 121 into the garbage storage compartment 120, storing them there. This reduces the amount of garbage and debris stored in the filter space 111, minimizing the likelihood of garbage and debris re-attaching to the first filter element 110 when the first water pump unit 200 restarts, and reducing the possibility of the first filter element 110 becoming clogged again.

[0040] When the first water pump unit 200 is operating, the compartment door 121 is closed. This prevents garbage fragments stored in the garbage storage compartment 120 from flowing back into the filter space 111 and from clogging the first filter element 110, thereby improving the efficiency of the automatic water tank cleaning device.

[0041] In this embodiment, the door 121 can rotate toward the interior of the waste storage bin 120 to open the waste storage bin 120. When the first water pump unit 200 is working, the door 121 is closed due to the water pressure inside the waste storage bin 120 and the water pressure inside the filter space 111; when the second water pump unit 320 is working, the door 121 is open under the influence of the water pressure inside the filter space 111 and the water pressure inside the waste storage bin 120.

[0042] It should be noted that in this embodiment, the door 121 can be opened and closed under control according to the working status of the first water pump unit 200 and the second water pump unit 320, or through the combined action of the water pressure in the waste storage bin 120 and the water pressure in the filter space 111 and its own gravity during the operation of the first water pump unit 200 and the second water pump unit 320, or through technical means well known to those skilled in the art. As long as it can be achieved that the door 121 is in a closed state when the first water pump unit 200 is working and the door 121 is in an open state when the second water pump unit 320 is working, the specific opening and closing method of the door 121 is not specifically limited here.

[0043] For example, such as Figure 3 and Figure 4As shown, the waste storage bin 120 includes a second filter element 122. A water spray chamber 310 is connected to the waste storage bin 120. The second water pump unit 320 can drive the water in the waste storage bin 120 to flow through the second filter element 122 into the water spray chamber 310. The bin door 121 is connected to the storage space 124 enclosed by the second filter element 122. The second filter element 122 can be configured in various shapes such as cylindrical or rectangular, as long as it can achieve the function of filtering waste fragments.

[0044] In this way, garbage fragments and other debris flowing into the garbage storage bin 120 through the bin door 121 can be stored in the storage space 124 after being filtered by the second filter element 122, and the water flowing out of the garbage storage bin 120 through the second filter element 122 can flow back into the spray chamber 310. That is to say, the second water pump unit 320 can drive the water flow to circulate in the spray chamber 310, the filter space 111 and the garbage storage bin 120.

[0045] For example, the waste storage bin 120 also includes an outer shell 123 (hereinafter referred to as the first outer shell 123 for easy distinction), the first outer shell 123 surrounds the second filter element 122, the bin door 121 is provided on the first outer shell 123, and the first outer shell 123 is also provided with an opening communicating with the water spray bin 310. That is to say, the second filter element 122 is located inside the first outer shell 123, the bin door 121 is provided on the first outer shell 123, and the second filter element 122 and the first outer shell 123 together enclose the storage space 124.

[0046] For example, the first housing 123 includes an annular side shell and a bottom shell and a top shell respectively connected to the two ends of the side shell. The second filter element 122 serves as the circumferential side wall of the storage space 124. The side shell surrounds the second filter element 122, the bottom shell serves as the bottom wall of the storage space 124, and the top shell serves as the top wall of the storage space 124.

[0047] As can be seen, water enters the waste storage bin 120 through the bin door 121 and then flows out through the second water pump unit 320. Thus, when the second filter element 122 is required to store waste fragments, the water flow can be driven within the relatively enclosed space formed by the first outer shell 123. This increases the driving force of the second water pump unit 320 on the water flow in the waste storage bin 120, increases the water flow rate, and improves the filtration and storage capacity of the waste storage bin 120 for waste fragments. At the same time, it can effectively pressurize the water flowing out of the waste storage bin 120, thereby enhancing the water flow intensity of the spray chamber 310.

[0048] The waste storage bin 120 is detachable from the filter unit 100. Waste fragments are stored in the waste storage bin 120, which is detachable from the filter unit 100 to facilitate removal of the waste storage bin 120 from the automatic pool cleaning device for cleaning the waste fragments inside.

[0049] For example, the top shell can be rotatably connected to the side shell, and the top shell can open or close the upward opening formed by the side shell. The bottom shell is fixedly connected to the second filter element 122. When the top shell opens the upward opening formed by the side shell, both the bottom shell and the second filter element 122 can be detached relative to the side shell and the first filter element 110. The side shell can be fixedly connected to the first filter element 110.

[0050] For example, the first housing 123 is provided with an opening, which is connected to the inlet of the second water pump unit 320 and the outlet of the second water pump unit 320 is connected to the spray chamber 310, so that the second water pump unit 320 drives the water flow into the spray chamber 310 and pressurizes the water flow in the spray chamber 310.

[0051] like Figure 3 As shown, the waste storage bin 120 and the first filter element 110 are stacked vertically. However, the relative positional relationship between the waste storage bin 120 and the first filter element 110 is not limited to this. For example, the waste storage bin 120 and the first filter element 110 can be arranged adjacent to each other on the same horizontal plane. For example, the waste storage bin 120 can be located above the first filter element 110, or the first filter element 110 can be located above the waste storage bin 120. It should be noted that the relative positional arrangement of the waste storage bin 120 and the first filter element 110 in this application can be set according to the experience of those skilled in the art, or according to the space, volume, and other requirements of the automatic water tank cleaning device, as long as the waste fragments filtered by the first filter element 110 can enter the waste storage bin 120 through the bin door 121. The relative positional arrangement of the waste storage bin 120 and the first filter element 110 is not specifically limited here.

[0052] The following explanation will be based on the example of a waste storage bin 120 located above the first filter element 110.

[0053] In one example, the bottom shell of the first outer shell 123 may be provided with a compartment opening, and a compartment door 121 is provided at the compartment opening in an openable and closable manner. When the compartment door 121 is open, garbage fragments can enter the storage space 124 from the filter space 111 through the compartment opening; when the compartment door 121 is closed, the compartment door 121 can prevent garbage fragments from returning from the storage space 124 to the filter space 111.

[0054] like Figure 3As shown, the bottom wall of the first outer casing 123 protrudes into the waste storage bin 120 with a flow channel 125, and the bin door 121 is closable at the upper opening of the flow channel 125. That is, the upper opening of the flow channel 125 is higher than the bottom of the waste storage bin 120. When the second water pump unit 320 is closed, waste fragments and the like fall to the bottom of the waste storage bin 120. The upper opening of the flow channel 125 is positioned high to reduce the possibility of waste fragments and the like flowing back into the filter space 111 of the first filter element 110 through the flow channel 125 when the second water pump unit 320 is closed but the bin door 121 is not yet closed.

[0055] like Figure 1 and Figure 3 As shown, the automatic pool cleaning device also includes a second housing 400, in which the filter unit 100, the first water pump unit 200, the rinsing assembly 300, and the spray chamber 310 are all housed. The second housing 400 has a through hole, and the water inlet 130 communicates with the through hole. When the water inlet 130 is open, water and debris can flow into the filter unit 100 through the through hole and the water inlet 130. The second housing 400 also has an opening communicating with the first water pump unit 200. The first water pump unit 200 can also drive the water flowing out of the first filter element 110 to flow out of the automatic pool cleaning device through the opening on the second housing 400.

[0056] For example, such as Figure 4 As shown, the water spray chamber 310 is located between the filter unit 100 and the first water pump unit 200.

[0057] In this embodiment, water flows from the filter unit 100 to the first water pump unit 200. Due to the driving action of the first water pump unit 200, the water flow rate towards the side wall of the filter unit 100 is the largest, meaning that the first filter element 110 on that side is most prone to clogging. The spray chamber 310 is located between the filter unit 100 and the first water pump unit 200, allowing the water sprayed from the spray chamber 310 to flush the first filter unit 100, which is most prone to clogging.

[0058] The spray chamber 310 can also be bent. The bent spray chamber 310 can be arranged around the outside of the filter unit 100 so as to rinse some of the first filter elements 110 at multiple side wall positions of the filter unit 100.

[0059] For example, such as Figure 2 and Figure 4As shown, the spray chamber 310 includes several water flow holes 312 for water flowing out of the first filter element 110 to pass through. The spray chamber 310 is located outside the filter unit 100. When the first water pump unit 200 is operating, the spray chamber 310 can easily obstruct the flow of water out of the filter unit 100. The spray chamber 310 includes multiple water flow holes 312, allowing the water flowing out of the first filter element 110 to pass through these holes 312, thus directing the water flow towards the first water pump unit 200. This reduces the obstruction effect of the spray chamber 310 on the water flowing out of the first filter element 110, improving the suction and filtration efficiency of the automatic water tank cleaning device.

[0060] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0063] In this application, unless otherwise stated, directional terms such as "up" and "down" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0064] The above description is merely an exemplary embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope described in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An automatic water tank cleaning device, comprising: A filtration unit, including a first filtration element; The first water pump unit is used to drive water flow into the filter unit and out through the first filter element; as well as A flushing assembly for flushing at least a portion of the first filter element of the filter unit, the flushing assembly comprising: A water spray chamber is disposed on the outside of the filter unit; as well as The second water pump unit is used to drive water flow into the spray chamber and pressurize the water flow so that the water flow flows into the filter unit after being sprayed out of the spray chamber and passes through the first filter element.

2. The automatic water tank cleaning device according to claim 1, wherein, The filtration unit further includes a waste storage compartment with a door. The door allows water and debris from the filtration unit to enter the waste storage compartment. When the second water pump unit is working, the door is open, and when the first water pump unit is working, the door is closed.

3. The automatic water tank cleaning device according to claim 2, wherein, The waste storage bin includes a second filter element, and the water spray chamber is connected to the waste storage bin. The second water pump unit drives the water in the waste storage bin to flow into the water spray chamber through the second filter element.

4. The automatic water tank cleaning device according to claim 3, wherein, The waste storage bin also includes an outer shell that surrounds the second filter element. The bin door is located on the outer shell, and the outer shell also has an opening that communicates with the water spray bin.

5. The automatic water tank cleaning device according to claim 2, wherein, The waste storage compartment is detachable from the filter unit.

6. The automatic water tank cleaning device according to any one of claims 1 to 5, wherein, The filtration unit includes a water inlet. When the second water pump unit is working, the water inlet is in a closed state, and when the first water pump unit is working, the water inlet is in an open state.

7. The automatic water tank cleaning device according to any one of claims 1 to 5, wherein, The spray chamber is located at least between the filter unit and the first water pump unit.

8. The automatic water tank cleaning device according to any one of claims 1 to 5, wherein, The water spray chamber includes a water spray nozzle, which is positioned toward the filter unit.

9. The automatic water tank cleaning device according to any one of claims 1 to 5, wherein, The spray chamber includes several water flow holes for water flowing from the first filter element to pass through.

10. The automatic water tank cleaning device according to any one of claims 1 to 5, wherein, During a cleaning cycle, the ratio of the working time of the first water pump unit to the working time of the second water pump unit of the automatic water tank cleaning device ranges from 20:1 to 30:1.

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