Underwater cleaning device

Abstract

The utility model discloses an underwater cleaning device which comprises a machine body and a pressure relief device arranged in the machine body. Wheels and a first water inlet are arranged at the bottom of the machine body, a water outlet and a water pump are arranged on the rear side of the machine body, a second water inlet and limiting channels are formed in the top of the machine body, and the limiting channels are arranged on the two sides of the second water inlet. The pressure relief device is arranged at the second water inlet, movably mounted on the limiting channel and used for sealing the second water inlet; when the buoyancy of water in the machine body on the pressure relief device is larger than the acting force of water outside the machine body on the pressure relief device, the pressure relief device moves upwards in the limiting channel, and therefore the second water inlet is closed; when the buoyancy of water inside the machine body to the pressure relief device is smaller than the acting force of water outside the machine body to the pressure relief device, the pressure relief device moves downwards in the limiting channel, and the second water inlet is opened; when the angle of the slope where the machine body is located is larger than a set value, buoyancy of water in the machine body to the pressure relief device drives the pressure relief device to move upwards in the limiting channel, and therefore the second water inlet is opened.

Description

Technical Field

[0001] The utility model relates to the technical field of underwater robots, and more specifically, to an underwater cleaning device. Background Art

[0002] When the swimming pool is in use, impurities such as leaves, branches, sand, and household garbage will fall into it, polluting the swimming pool and affecting the water quality. The traditional way to clean a swimming pool is by manual cleaning, but manual cleaning is time-consuming, labor-intensive, and costly. The current cleaning method is mainly by intelligent underwater robots. Intelligent underwater robots mainly use built-in filtering components and water pumps to suck in swimming pool water, filter garbage, and then discharge swimming pool water to clean the swimming pool. After cleaning, the underwater robot can return to the ground from underwater by climbing a slope or a wall.

[0003] When an underwater robot is climbing a wall or a slope, it may fall due to the influence of gravity. At this time, the underwater robot needs to increase the speed of the water pump to obtain greater propulsion. However, when the pump speed is increased, the underwater robot will also generate excessive suction, thereby sucking in more water at the water inlet, resulting in increased driving resistance of the underwater robot, slow driving, and increased power consumption. Utility Model Content

[0004] The utility model aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provide an underwater cleaning device for solving the problems of increased driving resistance, slow driving and increased power consumption of underwater robots, thereby achieving the effect of reducing resistance and power consumption.

[0005] The technical solution adopted by the utility model is:

[0006] An underwater cleaning device comprises a body and a pressure relief device arranged in the body; the bottom of the body is provided with wheels and a first water inlet, the rear side of the body is provided with a water outlet and a water pump for auxiliary drainage, the top of the body is provided with a second water inlet and a limiting channel, and the limiting channel is provided on both sides of the second water inlet;

[0007] The pressure relief device is arranged at the second water inlet and is movably mounted on the limiting channel to close the second water inlet;

[0008] When the buoyancy of the water inside the body on the pressure relief device is greater than the force exerted by the water outside the body on the pressure relief device, the pressure relief device moves upward in the limiting channel, thereby closing the second water inlet;

[0009] When the buoyancy of the water inside the body on the pressure relief device is less than the force exerted by the water outside the body on the pressure relief device, the pressure relief device moves downward in the limiting channel, the second water inlet is opened, and the water outside the body enters the body from the second water inlet;

[0010] When the slope angle of the machine body is greater than a set value, the buoyancy of the water inside the machine body on the pressure relief device drives the pressure relief device to move upward in the limiting channel, thereby opening the second water inlet.

[0011] Preferably, the pressure relief device is arranged below the second water inlet.

[0012] According to an underwater cleaning device described in the utility model, the pressure relief device includes a buoyancy mechanism and a limiting column for mounting the buoyancy mechanism, the buoyancy mechanism is arranged below the second water inlet and is used to close the second water inlet; the limiting column is movably installed on the limiting channel, so that the buoyancy mechanism can be movably installed on the limiting channel.

[0013] According to the underwater cleaning device of the utility model, when the buoyancy of the buoyancy mechanism is greater than the force exerted by the water outside the body on the buoyancy mechanism, the second water inlet is closed;

[0014] When the buoyancy exerted on the buoyancy mechanism is smaller than the force exerted on the buoyancy mechanism by the water outside the body, the second water inlet is opened.

[0015] According to an underwater cleaning device described in the utility model, the buoyancy mechanism includes a float and a limiting member for supporting the float, the limiting member is connected to the limiting column, and the float is arranged below the second water inlet for closing the second water inlet.

[0016] According to the underwater cleaning device described in the utility model, the limiting member is provided with a limiting groove for installing a floating block and limiting the position of the floating block;

[0017] The limiting groove includes a first limiting portion, a second limiting portion and a side wall, wherein the side wall is used to connect the two ends of the first limiting portion and the second limiting portion, and the limiting column is arranged on the side wall, and a distance is left between the limiting column and the top of the first limiting portion and the second limiting portion;

[0018] The floating block is embedded in the limiting groove, and the thickness of the floating block is equal to the height of the first limiting portion and the second limiting portion.

[0019] According to an underwater cleaning device described in the utility model, the buoyancy mechanism includes a limit member and a floating block connected to each other, the limit member is connected to the limit column, and the limit member is arranged below the second water inlet; the floating block is used to drive the limit member to move upward, thereby causing the limit member to close the second water inlet.

[0020] According to the underwater cleaning device described in the utility model, the limiting channel includes a first guide wall and a second guide wall, and the first guide wall and the second guide wall are respectively connected to the wall surface of the body;

[0021] The angle formed between the first guide wall and the bottom of the buoyancy mechanism is a first angle, the angle formed between the second guide wall and the bottom of the buoyancy mechanism is a second angle, and the first angle is an acute angle;

[0022] The limit column is restricted to move within the cross-sectional range of the limit channel, and when the rotation speed of the water pump in the machine body is less than the set value and the slope angle of the machine body is less than the first angle, the buoyancy mechanism drives the limit column to move up to the top position of the limit channel under the action of buoyancy, thereby causing the buoyancy mechanism to close the second water inlet;

[0023] When the slope angle of the machine body is greater than the first angle, the buoyancy mechanism drives the limiting column to move from the top position of the limiting channel to the first angle position, thereby opening the second water inlet;

[0024] When the rotation speed of the water pump in the machine body is greater than the set value, the negative pressure formed in the machine body overcomes the buoyancy of the buoyancy mechanism, and the buoyancy mechanism drives the limit column to move toward the wall of the machine body, thereby opening the second water inlet.

[0025] Further, the first guide wall and the second guide wall are connected to each other, and the first guide wall, the second guide wall and the inner wall of the body form a substantially triangular cross-section, and the angle formed between the first guide wall and the second guide wall is the vertex angle;

[0026] When the speed of the water pump in the machine body is less than the set value and the slope angle of the machine body is less than the first angle, the buoyancy mechanism drives the limit column to move upward to the top angle position under the action of buoyancy, thereby causing the buoyancy mechanism to close the second water inlet;

[0027] When the slope angle of the machine body is greater than the first angle, as the slope angle increases, the buoyancy mechanism drives the limiting column to move from the top angle position along the first guide wall to the first angle position, thereby opening the second water inlet.

[0028] Furthermore, the first angle has an angle range of 45° to 60°; and the first guide wall and the second guide wall are smoothly connected.

[0029] Specifically, the top angle is an arc angle toward the top of the body.

[0030] According to the underwater cleaning device described in the utility model, a filter assembly for collecting garbage is also provided inside the body, and the filter assembly is connected to the first water inlet, or the filter assembly is connected to the first water inlet and the second water inlet respectively.

[0031] According to an underwater cleaning device described in the utility model, a cover plate and a cover plate handle for opening the cover plate are provided on the top of the body, a third water inlet is provided on the cover plate handle, a recessed position concave toward the inside of the body is provided on the cover plate, the second water inlet is provided on the recessed position, the limiting channel is provided on both side surfaces of the recessed position, the position of the third water inlet is opposite to that of the second water inlet, and the cover plate can be detachably installed on the body.

[0032] According to the underwater cleaning device described in the utility model, the opening size of the recess gradually decreases in the direction from the third water inlet to the second water inlet; the opening size of the third water inlet is larger than the opening size of the second water inlet.

[0033] Compared with the prior art, the beneficial effects of the utility model are:

[0034] The utility model sets a pressure relief device in the underwater robot so that when the underwater robot travels on a slope, the second water inlet can be opened in time through the pressure relief device, thereby timely releasing pressure inside the machine body, thereby avoiding the need to inhale a larger water flow from the first water inlet, thereby generating a larger negative pressure inside the machine body; on the other hand, after the second water inlet is opened, a larger water flow can be provided inside the machine, which can meet the high-speed operation of the water pump and generate upward suction, thereby reducing the driving resistance of the underwater robot and facilitating the underwater robot to climb a slope. Compared with the prior art, the utility model has the advantages of simple structure, easy implementation, and greatly reducing the driving resistance of the underwater robot when climbing a slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of Example 1 of the utility model.

[0036] Figure 2 It is a structural schematic diagram of the pressure relief device of the utility model.

[0037] Figure 3 It is a schematic diagram of the working condition of the pressure relief device when the machine body of the utility model is traveling on a plane.

[0038] Figure 4 It is a schematic diagram of the working condition of the pressure relief device when the machine body of the utility model is traveling on a slope of 30 degrees.

[0039] Figure 5 It is a schematic diagram of the working condition of the pressure relief device when the machine body of the utility model is traveling on a slope of 60 degrees.

[0040] Figure 6 It is a schematic diagram of the working condition of the pressure relief device when the machine body of the utility model travels on a wall at a 90-degree angle.

[0041] Figure 7This is an exploded view of the pressure relief device of the utility model when it is arranged on the cover plate of the machine body.

[0042] Figure 8 This is a schematic diagram of the structure of Example 2 of the utility model.

[0043] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. However, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0045] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" used in the present invention and the appended claims are intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0046] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0047] Example 1

[0048] like Figure 1 and Figure 2As shown, the present embodiment discloses an underwater cleaning device, which is mainly used for cleaning underwater impurities, and includes a body 100 and a pressure relief device 200 arranged in the body 100; wherein, wheels 110 and a first water inlet 120 are provided at the bottom of the body 100, a water outlet 130 and a water pump 300 for auxiliary drainage are provided at the rear side of the body 100, and a second water inlet 400 and a limiting channel 500 are provided at the top of the body 100, wherein the limiting channel 500 is provided on both sides of the second water inlet 400; the pressure relief device 200 is provided below the second water inlet 400, and is movably installed on the limiting channel 500, so as to close the second water inlet 400.

[0049] A filter assembly 600 for collecting garbage is disposed inside the body 100, wherein the filter assembly 600 can be connected to the first water inlet 120, or can be connected to the first water inlet 120 and the second water inlet 400. In this embodiment, the filter assembly 600 is connected to the first water inlet 120 and the second water inlet 400 respectively.

[0050] The working principle of this technical solution is as follows: water and impurities outside the body 100 are sucked in from the first water inlet 120 under the action of the internal water pump 300, wherein the sucked garbage is collected by the filter assembly 600, and the sucked water is discharged through the water outlet 130, while providing propulsion for the underwater robot to move forward. After the work is completed, the underwater robot returns to the ground from underwater by climbing a slope or a wall.

[0051] When the machine body 100 is traveling on a flat surface, the rotation speed of the water pump 300 in the machine body 100 is less than a set value, and the buoyancy of the water inside the machine body 100 on the pressure relief device 200 is greater than the force exerted by the water outside the machine body 100 on the pressure relief device 200, thereby causing the pressure relief device 200 to move upward in the limiting channel 500, thereby closing the second water inlet 400; when the machine body 100 is traveling on a slope and the slope angle of the machine body 100 is greater than a set value, the buoyancy of the water inside the machine body 100 on the pressure relief device 200 drives the pressure relief device 200 to move upward in the limiting channel 500, thereby opening the second water inlet 400. Since the machine body 100 needs to increase the rotation speed of the water pump 300 to obtain greater propulsion force, more water will be sucked into the first water inlet 120 at this time, and a greater negative pressure will be formed in the machine body 100. When the rotation speed of the water pump 300 is greater than the set value, the buoyancy of the water inside the machine body 100 on the pressure relief device 200 is less than the force of the water outside the machine body 100 on the pressure relief device 200, thereby causing the pressure relief device 200 to move downward in the limiting channel 500, and the second water inlet 400 is opened, and the water outside the machine body 100 enters the machine body 100 from the second water inlet 400, thereby reducing the driving resistance of the machine body 100.

[0052] Furthermore, in this embodiment, the pressure relief device 200 includes a buoyancy mechanism and a limiting column 220 for mounting the buoyancy mechanism, wherein the buoyancy mechanism is arranged below the second water inlet 400 for closing the second water inlet 400; the limiting column 220 is movably installed on the limiting channel 500, thereby allowing the buoyancy mechanism to be movably installed on the limiting channel 500.

[0053] When the buoyancy of the buoyancy mechanism is greater than the force exerted by the water outside the body 100 on the buoyancy mechanism, the buoyancy mechanism closes the second water inlet 400 to prevent the water outside the body 100 from entering the inside of the body 100 through the second water inlet 400, so that the body 100 can travel on a plane; when the body 100 is traveling on a slope and the rotation speed of the water pump 300 is greater than the set value, a greater negative pressure is generated inside the body 100, so that the buoyancy of the buoyancy mechanism is less than the force exerted by the water outside the body 100 on the buoyancy mechanism. Therefore, the water outside the body 100 can push the buoyancy mechanism downward, thereby opening the second water inlet 400, and the external water flows into the inside of the body 100 from the second water inlet 400, providing additional water flow to the inside of the body 100 to meet the high-speed operation of the water pump 300, while also generating upward suction to reduce the driving resistance of the underwater robot. In this way, the driving resistance of the underwater robot will not be increased due to excessive suction generated at the first water inlet 120 .

[0054] Combination Figure 2 As shown, specifically, the buoyancy mechanism includes a floating block 211 and a limiting member 212 for supporting the floating block 211, wherein the limiting member 212 is connected to the limiting column 220. In this technical solution, the limiting member 212 or the floating block 211 can be selected to be arranged below the second water inlet 400, and then the second water inlet 400 is closed by the limiting member 212 or the floating block 211. The specific positions of the floating block 211 and the limiting member 212 are not limited.

[0055] In this embodiment, in order to better seal the second water inlet 400, the floating block 211 is arranged below the second water inlet 400 to seal the second water inlet 400. In this embodiment, the limiting member 212 is provided with a limiting groove for installing the floating block 211 and limiting the floating block 211; wherein the limiting groove includes a first limiting portion 2121, a second limiting portion 2122 and a side wall 2123, and the side wall 2123 is used to connect the two ends of the first limiting portion 2121 and the second limiting portion 2122 to form the limiting groove. The limiting column 220 is arranged on the side wall 2123, and there is a gap between the limiting column 220 and the top of the first limiting portion 2121 and the second limiting portion 2122; when the limiting column 220 moves downward with the limiting member 212, the gap between the limiting column 220 and the top of the first limiting portion 2121 and the second limiting portion 2122 is used for the water flow outside the machine body to flow into the inside of the machine body. Among them, the float block 211 is embedded in the limiting groove, and the thickness of the float block 211 is level with the height of the first limiting part 2121 and the second limiting part 2122, so that when the buoyancy mechanism closes the second water inlet 400 through buoyancy, the float block 211 can be tightly connected to the second water inlet 400.

[0056] Furthermore, the inner shape of the limit groove matches the shape of the float block 211. In this embodiment, the float block 211 is generally in the shape of a wedge, and the depth of the front side of the limit groove is shallower than the depth of the rear side, wherein the front side of the limit groove refers to the side close to the head direction of the body 100.

[0057] In the present technical solution, the float 211 is not limited to being embedded in the limit groove, the float 211 can also be installed at other positions of the limit member 212. At this time, the float 211 is connected to the limit member 212, and the limit member 212 is connected to the limit column 220. The limit member 212 can be set below the second water inlet 400; the float 211 is used to generate buoyancy to drive the limit member 212 to move upward, thereby causing the limit member 212 to close the second water inlet 400.

[0058] Combination Figures 3 to 6 As shown, further, in this embodiment, the limiting channel 500 includes a first guide wall 510 and a second guide wall 520 that are connected to each other, and the first guide wall 510, the second guide wall 520 and the inner wall of the body are connected to each other, forming a cross-section that is roughly triangular in shape, and the angle formed between the first guide wall 510 and the second guide wall 520 is the vertex angle. At this time, the distance between the limiting column 220 and the top of the first limiting portion 2121 and the second limiting portion 2122 is the height of the triangle.

[0059] Further, the first guide wall 510 and the second guide wall 520 are smoothly connected, and the smooth connection position forms an arc angle toward the top of the body; the angle formed between the first guide wall 510 and the bottom of the buoyancy mechanism is the first angle θ, and the angle formed between the second guide wall 520 and the bottom of the buoyancy mechanism is the second angle, wherein the first angle θ of the limiting channel 500 can be set to determine the climbing angle of the body 100 when the second water inlet 400 is opened. In this technical solution, the angle range of the first angle θ is 45° to 60°; in this embodiment, the first angle θ is 50°.

[0060] The limiting column 220 is limited to move within the cross-sectional range of the limiting channel 500, and when the machine body is traveling on a plane, the buoyancy mechanism drives the limiting column to move upward, and the limiting column 220 is located at an arc angle position; when the machine body is traveling on a slope, as the slope angle increases, the direction of the buoyancy on the buoyancy mechanism always remains vertically upward, and the machine body is tilted at a corresponding angle along the slope, resulting in a change in the direction of the buoyancy on the buoyancy mechanism relative to the machine body. The slope angle is 0 to 90 degrees.

[0061] Specifically, Figure 4 In the 30-degree climbing condition shown, when the machine body 100 is traveling on a 30-degree slope and the rotation speed of the water pump 300 in the machine body 100 is greater than the set value, a large negative pressure is formed in the machine body 100, and the buoyancy mechanism drives the limit column 220 to move toward the wall of the machine body 100, thereby opening the second water inlet 400. At this time, the opening of the second water inlet 400 is mainly achieved by the change in rotation speed and the formation of negative pressure in the machine body.

[0062] Specifically, Figure 5 In the 60-degree climbing condition shown, when the machine body 100 is traveling on a 60-degree slope, and the rotation speed of the water pump 300 is less than the set value, and the slope angle is greater than the first angle θ, the buoyancy mechanism drives the limit column 220 to move from the top position of the limit channel 500 to the position of the first angle θ, thereby opening the second water inlet 400. At this time, the opening of the second water inlet 400 can be achieved only by buoyancy. At this time, the rotation speed of the water pump 300 is increased to obtain a greater driving force, and a greater water flow rate can be obtained at the second water inlet 400, and at this time, it is not necessary to rely on increasing the rotation speed of the water pump 300 to overcome the buoyancy of the buoyancy mechanism, which can save a certain amount of power consumption.

[0063] Specifically, Figure 6 The wall climbing condition shown is the same as the above-mentioned 60-degree climbing condition. The angle of the 90-degree wall is greater than the first angle θ. The opening of the second water inlet 400 can be achieved only by buoyancy, and the rotation speed of the water pump 300 is increased to obtain greater driving force, thereby driving the underwater robot to climb the wall.

[0064] Combination Figure 7 As shown, further, in the present technical solution, a cover plate 140 and a cover plate handle 150 for opening the cover plate 140 are provided on the top of the body 100, a third water inlet 151 is provided on the cover plate handle 150, a recessed position concave toward the interior of the body 100 is provided on the cover plate 140, a second water inlet 400 is provided on the recessed position, a limiting channel 500 is provided on both side surfaces of the recessed position, a position of the third water inlet 151 is opposite to a position of the second water inlet 400, and the cover plate 140 is detachably installed on the body 100.

[0065] Preferably, the opening size of the recess gradually decreases in the direction from the third water inlet 151 to the second water inlet 400 ; the opening size of the third water inlet 151 is larger than the opening size of the second water inlet 400 .

[0066] Example 2

[0067] Combination Figure 8 As shown, in the technical solution, the structure of the pressure relief device 200 is not limited to being embedded in the body, and the difference between the embodiment 2 and the embodiment 1 is that a part of the pressure relief device 200 is embedded in the body, and another part is exposed outside the body. Among them, the filter assembly 600 is connected to the first water inlet 120.

[0068] Obviously, the above embodiments of the utility model are only examples for clearly explaining the technical solution of the utility model, and are not intended to limit the specific implementation methods of the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. An underwater cleaning device, characterized in that: It comprises a body and a pressure relief device arranged in the body; the bottom of the body is provided with wheels and a first water inlet, the rear side of the body is provided with a water outlet and a water pump for auxiliary drainage, the top of the body is provided with a second water inlet and a limiting channel, and the limiting channel is provided on both sides of the second water inlet; The pressure relief device is arranged at the second water inlet and is movably mounted on the limiting channel to close the second water inlet; When the buoyancy of the water inside the body on the pressure relief device is greater than the force exerted by the water outside the body on the pressure relief device, the pressure relief device moves upward in the limiting channel, thereby closing the second water inlet; When the buoyancy of the water inside the body on the pressure relief device is less than the force exerted by the water outside the body on the pressure relief device, the pressure relief device moves downward in the limiting channel, the second water inlet is opened, and the water outside the body enters the body from the second water inlet; When the slope angle of the machine body is greater than a set value, the buoyancy of the water inside the machine body on the pressure relief device drives the pressure relief device to move upward in the limiting channel, thereby opening the second water inlet.

2. An underwater cleaning device according to claim 1, characterized in that: The pressure relief device includes a buoyancy mechanism and a limiting column for mounting the buoyancy mechanism. The buoyancy mechanism is arranged below the second water inlet and is used to close the second water inlet. The limiting column is movably installed on the limiting channel, so that the buoyancy mechanism is movably installed on the limiting channel.

3. An underwater cleaning device according to claim 2, characterized in that: When the buoyancy exerted on the buoyancy mechanism is greater than the force exerted on the buoyancy mechanism by the water outside the body, the second water inlet is closed; When the buoyancy exerted on the buoyancy mechanism is smaller than the force exerted on the buoyancy mechanism by the water outside the body, the second water inlet is opened.

4. An underwater cleaning device according to claim 2 or 3, characterized in that: The buoyancy mechanism includes a floating block and a limiting member for carrying the floating block, the limiting member is connected to the limiting column, and the floating block is arranged below the second water inlet and is used to close the second water inlet.

5. An underwater cleaning device according to claim 4, characterized in that: The limiting member is provided with a limiting groove for installing the floating block and limiting the position of the floating block; The limiting groove includes a first limiting portion, a second limiting portion and a side wall, wherein the side wall is used to connect the two ends of the first limiting portion and the second limiting portion, and the limiting column is arranged on the side wall, and a distance is left between the limiting column and the top of the first limiting portion and the second limiting portion; The floating block is embedded in the limiting groove, and the thickness of the floating block is equal to the height of the first limiting portion and the second limiting portion.

6. An underwater cleaning device according to claim 2, characterized in that: The buoyancy mechanism includes a limit member and a floating block connected to each other, the limit member is connected to the limit column, and the limit member is arranged below the second water inlet; the floating block is used to drive the limit member to move upward, thereby causing the limit member to close the second water inlet.

7. An underwater cleaning device according to claim 2, characterized in that: The limiting channel includes a first guide wall and a second guide wall, and the first guide wall and the second guide wall are respectively connected to the wall surface of the body; The angle formed between the first guide wall and the bottom of the buoyancy mechanism is a first angle, the angle formed between the second guide wall and the bottom of the buoyancy mechanism is a second angle, and the first angle is an acute angle; The limit column is restricted to move within the cross-sectional range of the limit channel, and when the rotation speed of the water pump in the machine body is less than the set value and the slope angle of the machine body is less than the first angle, the buoyancy mechanism drives the limit column to move up to the top position of the limit channel under the action of buoyancy, thereby causing the buoyancy mechanism to close the second water inlet; When the slope angle of the machine body is greater than the first angle, the buoyancy mechanism drives the limiting column to move from the top position of the limiting channel to the first angle position, thereby opening the second water inlet; When the rotation speed of the water pump in the machine body is greater than the set value, the negative pressure formed in the machine body overcomes the buoyancy of the buoyancy mechanism, and the buoyancy mechanism drives the limit column to move toward the wall of the machine body, thereby opening the second water inlet.

8. An underwater cleaning device according to claim 7, characterized in that: The first guide wall and the second guide wall are connected to each other, and the first guide wall, the second guide wall and the inner wall of the body form a substantially triangular cross-section; the angle formed between the first guide wall and the second guide wall is the vertex angle; When the speed of the water pump in the machine body is less than the set value and the slope angle of the machine body is less than the first angle, the buoyancy mechanism drives the limit column to move upward to the top angle position under the action of buoyancy, thereby causing the buoyancy mechanism to close the second water inlet; When the slope angle of the machine body is greater than the first angle, the buoyancy mechanism drives the limiting column to move from the top angle position along the first guide wall to the first angle position, thereby opening the second water inlet.

9. An underwater cleaning device according to claim 7, characterized in that: The first angle ranges from 45° to 60°; the first guide wall and the second guide wall are smoothly connected.

10. An underwater cleaning device according to claim 1, characterized in that: A filter assembly for collecting garbage is also provided inside the machine body, and the filter assembly is connected to the first water inlet, or the filter assembly is connected to the first water inlet and the second water inlet respectively.

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