Liquid circulation mechanism and liquid circulation device

Abstract

This invention discloses a liquid circulation mechanism and a liquid circulation device. The liquid circulation mechanism includes a control valve and a water pipe assembly. The control valve includes a valve body with a valve chamber inside, and a float ball is disposed within the valve chamber. The water pipe assembly includes a first inlet pipe, a first outlet pipe, a second inlet pipe, and a second outlet pipe. One end of the first inlet pipe is connected to the outlet of a water pump located in a first container, and the other end is connected to a first hole at the bottom of the valve body. One end of the first outlet pipe is connected to a second hole on the valve body, and the other end is connected to the first container. One end of the second inlet pipe is inserted below the liquid surface in the second container, and the other end is connected to a non-end position of the first outlet pipe. One end of the second outlet pipe is connected to a third hole on the valve body, and the other end is connected to the second container. The second, third, and first holes are arranged vertically from top to bottom at intervals. The float ball selectively blocks the second and third holes. The liquid circulation mechanism of this invention has low power consumption and low cost.

Description

Technical Field

[0001] This invention relates to the field of liquid circulation equipment technology, and more particularly to a liquid circulation mechanism and a liquid circulation device. Background Technology

[0002] In daily life or production processes, many scenarios require the circulation of liquids, such as liquid filtration and cooling. The existing liquid circulation between two containers is generally accomplished in the following two ways: First, two water pumps are used, one in container A and one in container B. The pump in container A pumps liquid from container A into container B, and the pump in container B then pumps liquid from container B back into container A, thus achieving liquid circulation between containers A and B. This method requires two water pumps, resulting in high costs and electricity consumption. Second, one water pump is used. Container A is placed higher than container B, and an opening is made in the side or bottom of container A. A first water pipe is installed at the opening, with its lower end connected to container B. The height difference automatically sends water from container A into container B, and the water in container B is then pumped back to container A through the second water pipe, achieving liquid circulation between containers A and B. While this method uses only one water pump, reducing electricity consumption and costs, it requires an opening in container A, compromising the integrity of container A and increasing manufacturing costs. Furthermore, not all containers are suitable for openings, making this method less versatile. Summary of the Invention

[0003] The purpose of this invention is to provide a liquid circulation mechanism and liquid circulation device that are low in cost, consume little power, do not damage the container structure, and have a wide range of applications.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] On one hand, a liquid circulation mechanism is provided, including a control valve and a water pipe assembly. The control valve includes a valve body with a valve cavity inside, and a float ball inside the valve cavity. The water pipe assembly includes a first inlet pipe, a first outlet pipe, a second inlet pipe, and a second outlet pipe. One end of the first inlet pipe is connected to the outlet of a water pump located in a first container, and the other end is connected to a first hole at the bottom of the valve body. One end of the first outlet pipe is connected to a second hole on the valve body, and the other end is connected to the first container. One end of the second inlet pipe is inserted below the liquid surface in the second container, and the other end is connected to a non-end position of the first outlet pipe. One end of the second outlet pipe is connected to a third hole on the valve body, and the other end is connected to the second container. The height of the second container is greater than the height of the first container. The second hole, the third hole, and the first hole are arranged vertically from top to bottom at intervals. The material density of the float ball is less than the density of the liquid inside the valve body, so that the float ball is always floating. The float ball selectively blocks the second hole and the third hole.

[0006] As a preferred embodiment of the liquid circulation mechanism, the end of the first inlet pipe away from the valve body is adjacent to the bottom of the first container.

[0007] As a preferred embodiment of the liquid circulation mechanism, a vent is provided on the second inlet pipe. The vent is located near the end of the second inlet pipe that connects to the first outlet pipe, and the vent is lower than or equal to the position where the liquid level in the second container needs to be maintained.

[0008] As a preferred embodiment of the liquid circulation mechanism, the top surface of the float is at the same height as the liquid level in the valve body, or the top surface of the float extends beyond the liquid level in the valve body.

[0009] As a preferred embodiment of the liquid circulation mechanism, the float is spherical, the cross-section of the third hole and the cross-section of the second hole are both circular, and the cross-sectional diameters of the third hole and the second hole are both smaller than the diameter of the float.

[0010] As a preferred embodiment of the liquid circulation mechanism, the cross-sectional area of ​​the valve cavity minus the maximum cross-sectional area of ​​the float is greater than or equal to the cross-sectional area of ​​the first inlet pipe.

[0011] As a preferred embodiment of the liquid circulation mechanism, the second hole is provided on the top or side wall of the valve body.

[0012] As a preferred embodiment of the liquid circulation mechanism, the end of the second outlet pipe away from the valve body is located above the liquid surface of the second container, and the end of the second inlet pipe away from the first outlet pipe is adjacent to the bottom of the second container.

[0013] Secondly, a liquid circulation device is provided, comprising a first container, a second container, a water pump, and the liquid circulation mechanism. The height of the second container is greater than the height of the first container. The water pump is disposed inside the first container. The outlet of the water pump is connected to the second container through a water pipe assembly of the liquid circulation mechanism. The outlet of the water pump is connected to one end of a first inlet pipe of the water pipe assembly. The other end of the first inlet pipe is connected to a first hole at the bottom of the valve body of the control valve of the liquid circulation mechanism. One end of a first outlet pipe of the water pipe assembly is connected to a second hole on the valve body, and the other end is connected to the first container. One end of a second inlet pipe of the water pipe assembly is located below the liquid surface in the second container, and the other end is connected to a non-end position of the first outlet pipe. One end of a second outlet pipe of the water pipe assembly is connected to a third hole on the valve body, and the other end is connected to the second container.

[0014] The beneficial effects of this invention are as follows: By setting a control valve with a float ball, when the water pump continuously pumps liquid into the first inlet pipe, the liquid level in the valve chamber gradually increases, first reaching the position of the third hole. The liquid enters the second outlet pipe through the third hole and then flows into the second container. The thrust generated by the liquid flow gradually pushes the float ball to the third hole to block it. At this time, the second outlet pipe stops discharging liquid, and the liquid level in the valve body continues to rise to the second hole, entering the first outlet pipe through the second hole. The first outlet pipe transports the liquid to the first container. During the process of transporting liquid in the first outlet pipe, the liquid in the first outlet pipe moves downward under the action of gravity, forming a siphon during the movement. This creates a negative pressure at the connection between the first outlet pipe and the second inlet pipe, causing the second inlet pipe to draw the liquid in the second container into the first outlet pipe for transport to the first container. During this process, the siphon effect in the first outlet pipe will create a negative pressure at the second hole, rapidly discharging the liquid from the control valve. As the liquid draws towards the first outlet pipe, the float is propelled by the liquid, rapidly moving from the third hole to the second hole and sealing it. The siphon effect within the first outlet pipe further binds the float tightly to the second hole, sealing it completely. This siphon effect continues, allowing the second inlet pipe to continuously supply liquid into the first outlet pipe, while the first outlet pipe continuously supplies liquid to the first container. The pump continuously supplies liquid to the valve chamber through the first inlet pipe. Meanwhile, the third hole remains open, allowing the second outlet pipe to continuously transfer liquid from the first container to the second container, thus achieving liquid circulation between the first and second containers. As long as the siphon effect within the first outlet pipe remains intact, the liquid in both containers will always circulate. This liquid circulation device of the present invention requires only one pump and does not require any holes in the containers, achieving continuous liquid circulation between the two containers without damaging them. It also features low power consumption and low cost. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of a liquid circulation device according to an embodiment of the present invention.

[0017] Figure 2 This is a cross-sectional schematic diagram of a liquid circulation mechanism according to an embodiment of the present invention (the water pump of the liquid circulation device is shown when the float blocks the third hole).

[0018] Figure 3 This is a cross-sectional schematic diagram of a liquid circulation mechanism according to an embodiment of the present invention (the water pump of the liquid circulation device is shown when the float blocks the second hole).

[0019] In the picture:

[0020] 1. First container; 2. Second container; 3. Water pump; 4. Control valve; 41. Valve body; 411. First hole; 412. Second hole; 413. Third hole; 42. Valve chamber; 43. Float; 5. First inlet pipe; 6. First outlet pipe; 7. Second inlet pipe; 71. Vent hole; 8. Second outlet pipe. Detailed Implementation

[0021] The advantages and features of the present invention, as well as methods of implementing them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. These embodiments are provided merely to complete the disclosure of the invention and to enable those skilled in the art to fully understand the scope of the invention, which is defined only by the scope of the claims. The same reference numerals denote the same constituent elements throughout the specification.

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] like Figures 1 to 3As shown, the liquid circulation device of the present invention includes a first container 1, a second container 2, a water pump 3, and a liquid circulation mechanism. The liquid circulation mechanism includes a water pipe assembly and a control valve 4. The height of the second container 2 is greater than the height of the first container 1, or the height of the liquid level in the second container 2 relative to the ground is greater than the height of the liquid level in the first container relative to the ground. The water pump 3 is disposed inside the first container 1, and the outlet end of the water pump 3 is connected to the second container 2 through the water pipe assembly. The control valve 4 includes a valve body 41, a valve cavity 42 disposed inside the valve body 41, and a float ball 43 disposed inside the valve cavity 42. The water pipe assembly includes a first inlet pipe 5, a first outlet pipe 6, a second inlet pipe 7, and a second outlet pipe 8. One end of the first inlet pipe 5 is connected to the outlet end of the water pump 3, and the other end is connected to the first hole 411 at the bottom of the valve body 41. One end of the first outlet pipe 6... The first outlet pipe 6 is connected to the second hole 412 on the valve body 41, and the other end is connected to the first container 1 (that is, the end of the first outlet pipe 6 can be inserted into the first container 1 or located above the first container 1). One end of the second inlet pipe 7 is located below the liquid surface of the second container 2, and the other end is connected to the non-end position of the first outlet pipe 6. One end of the second outlet pipe 8 is connected to the third hole 413 on the valve body 41, and the other end is connected to the second container 2 (that is, the end of the second outlet pipe 8 can be inserted into the second container 2 or located above the second container 2). The third hole 413 is provided on the side wall of the valve body 41. The second hole 412, the third hole 413 and the first hole 411 are arranged vertically from top to bottom at intervals. The float ball 43 selectively blocks the second hole 412 and the third hole 413.

[0024] In specific operation, when water pump 3 starts and continuously pumps liquid into the first inlet pipe 5, the liquid level in the valve chamber 42 gradually increases, first reaching the position of the third hole 413. The liquid enters the second outlet pipe 8 through the third hole 413 and then flows into the second container 2. The thrust generated by the liquid flow gradually pushes the float 43 to the third hole 413 to block the third hole 413. At this time, the second outlet pipe 8 stops discharging liquid, and the liquid level in the valve body 41 continues to rise to the second hole 412, entering the first outlet pipe 6 through the second hole 412. The first outlet pipe 6 transports the liquid to the first container 1. During the process of transporting liquid through the first outlet pipe 6, the liquid in the first outlet pipe 6 moves downward under the action of gravity, forming a siphon during the movement. This creates a negative pressure at the connection between the first outlet pipe 6 and the second inlet pipe 7, causing the second inlet pipe 7 to draw the liquid in the second container 2 into the first outlet pipe 6 for transport to the first container 1. During this process, the first outlet pipe 6... The siphon effect within pipe 6 creates negative pressure at the second hole 412, rapidly drawing the liquid from control valve 4 towards the first outlet pipe 6. The float 43 is propelled by the liquid, quickly moving from the third hole 413 to the second hole 412 and sealing it. The siphon effect within the first outlet pipe 6 also tightly adheres the float 43 to the second hole 412, sealing it. This siphon effect continues, causing the second inlet pipe 7 to continuously supply liquid to the first outlet pipe 6, which in turn continuously supplies liquid to the first container 1. The water pump 3 continuously supplies liquid to the valve chamber 42 through the first inlet pipe 5. Meanwhile, the third hole 413 remains open, and the second outlet pipe 8 continuously supplies liquid from the first container 1 to the second container 2, achieving liquid circulation between the first and second containers. As long as the siphon effect within the first outlet pipe 6 is not disrupted, the liquid in the first and second containers will always maintain circulation.

[0025] The liquid circulation device of the present invention only requires a water pump 3 and does not need to open any hole structure on the container. It can realize the liquid circulation of two containers without damaging the container, and has low power consumption and low cost.

[0026] In this embodiment, the material density of the float 43 is less than the density of the liquid inside the valve body 41, so that the float 43 is always in a floating state, that is, the float 43 can be in a floating state when there is liquid inside the valve body 41.

[0027] Preferably, the second hole 412 is opened at the top of the valve body 41, which makes it easy for the float 43 to move quickly to the position of the second hole 412 under the action of the liquid flow in the second hole 412, so that the float 43 can move accurately, and the vertical upward thrust on the float 43, under the limitation of the top of the valve cavity 42, makes it difficult for the float 43 to be displaced.

[0028] Of course, the second hole 412 is not limited to being opened at the top of the valve body 41, but can also be opened on the side wall of the valve body 41, as long as the position of the second hole 412 is higher than the position of the third hole 413.

[0029] Optionally, the top surface of the float 43 extends beyond the liquid surface inside the valve body 41. This is so that the float 43 can move quickly with the flow of the liquid. When blocking the third hole 413, if the float 43 is submerged below the liquid surface, the liquid flow from the first inlet pipe 5 into the control valve 4 may not be able to push the float 43 to move towards the third hole 413. When blocking the second hole 412, if the float 43 is submerged below the liquid surface, the negative pressure formed by the siphon in the second hole 412 may not have enough suction to pull the float 43 towards the second hole 412.

[0030] Of course, the top surface of the float 43 is not limited to exceeding the liquid level inside the valve body 41, but can also be flush with the liquid level inside the valve body 41.

[0031] In one embodiment, the end of the first inlet pipe 5 away from the valve body 41 is adjacent to the bottom of the first container 1. The end of the first inlet pipe 5 away from the valve body 41 is connected to the water pump 3. The water pump 3 has a certain weight, and in order for the water pump 3 to draw out the liquid at the bottom of the first container 1 for circulation and avoid the bottom liquid not circulating, the water pump 3 is set at the bottom of the first container 1, thereby making the end of the first inlet pipe 5 away from the valve body 41 adjacent to the bottom of the first container 1, reducing the structure supporting the water pump 3.

[0032] In this embodiment, a vent 71 is provided on the second inlet pipe 7. The vent 71 is adjacent to the end of the second inlet pipe 7 connected to the first outlet pipe 6, and the vent 71 is lower than or equal to the position where the liquid level in the second container 2 needs to be maintained. When the end of the second inlet pipe 7 away from the first outlet pipe 6 is close to the bottom of the second container 2, it is necessary to balance the liquid level in the first container 1 and the second container 2 to avoid the phenomenon that the liquid level in one of the containers drops severely or even disappears due to long-term circulation. The vent 71 is set at the position where the liquid level in the second container 2 needs to be maintained or slightly lower than this position. When the liquid level in the second container 2 drops to the point where the vent 71 is slightly exposed, a small amount of air enters the first outlet pipe 6 through the vent 71, which can reduce the liquid flow rate of the first outlet pipe 6, thereby reducing the flow rate of liquid supplied from the first container 1 to the second container 2 and balancing the liquid level in the first container 1 and the second container 2. When the liquid flow rate of the first outlet pipe 6 is much greater than the liquid flow rate of the second outlet pipe 8 after siphon formation, or in other special circumstances, the vent 71 is used to balance the liquid level in the first container 1 and the second container 2. If a power outage causes the liquid level in the second container 2 to drop, a large amount of air will enter the first outlet pipe 6 through the vent 71, disrupting the siphon and stopping the liquid circulation, thus preventing a severe drop in the liquid level or even the absence of liquid in the second container 2. When the liquid circulation needs to be restarted after it has stopped, because the vent 71 is small and the liquid level in the second container 2 will remain near the vent 71 after the liquid circulation stops, the negative pressure suction generated by the siphon after restarting is sufficient to draw the liquid in the second container 2 into the first outlet pipe 6 through the second inlet pipe 7, even if air enters through the vent 71, quickly restoring the liquid circulation state. If excessive air enters the vent 71, causing the liquid circulation state to be unable to be restored normally, the liquid level in the second container 2 can be restored to submerge the vent 71, thus restoring the liquid circulation state.

[0033] When the power is off, the water pump 3 stops running, the second outlet pipe 8 stops supplying liquid to the second container 2, and the liquid level in the second container 2 drops. When a large amount of air enters the first outlet pipe 6 through the vent 71, the siphon effect is destroyed and disappears, and the liquid circulation stops. If the siphon effect disappears, it is only necessary to restart the water pump 3 and restore the liquid level in the second container 2 to submerge the vent 71 to re-establish the siphon state and realize the liquid circulation between the first container 1 and the second container 2.

[0034] When the liquid flow rate of the first outlet pipe 6 is much greater than that of the second outlet pipe 8 after the siphon is formed, causing the liquid level in the second container 2 to drop, a large amount of air enters the first outlet pipe 6 through the vent 71, the siphon effect is destroyed, the siphon effect disappears, and the liquid circulation stops. At this time, it is necessary to limit the flow rate of the first outlet pipe 6 and restore the liquid level in the second container 2 to submerge the vent 71, so that the siphon state can be re-established and the liquid circulation between the first container 1 and the second container 2 can be realized.

[0035] When the liquid flow rate of the first outlet pipe 6 is much smaller than that of the first inlet pipe 5 after the siphon is formed, causing the liquid level in the second container 2 to rise, it is necessary to limit the flow rate of the first inlet pipe 5 to achieve flow balance between the liquid circulation of the first container 1 and the second container 2.

[0036] In one embodiment, the end of the second outlet pipe 8 away from the valve body 41 is located above the liquid surface of the second container 2, and the end of the second inlet pipe 7 away from the first outlet pipe 6 is adjacent to the bottom of the second container 2. By placing the end of the second outlet pipe 8 away from the valve body 41 above the liquid surface of the second container 2, the back pressure of the liquid in the second container 2 on the second outlet pipe 8 when the second outlet pipe 8 outputs liquid is reduced, ensuring that the second outlet pipe 8 outputs liquid without resistance. On the other hand, placing the end of the second inlet pipe 7 away from the first outlet pipe 6 adjacent to the bottom of the second container 2 ensures that the liquid at the bottom of the second container 2 is transported to the first container 1 for circulation, ensuring that liquid at any position in the second container 2 can participate in circulation.

[0037] In this embodiment, the end of the first water outlet pipe 6 away from the valve body 41 is located above the first container 1. This design is also to reduce the back pressure of the liquid in the first container 1 on the first water outlet pipe 6 when the first water outlet pipe 6 outputs liquid, so as to ensure that the first water outlet pipe 6 outputs liquid without resistance.

[0038] In one embodiment, the float 43 is spherical, and the cross-sections of the third hole 413 and the second hole 412 are both circular. Furthermore, the diameters of the third hole 413 and the second hole 412 are both smaller than the diameter of the float 43. By setting the float 43 to a spherical shape and making the cross-sections of the second hole 412 and the third hole 413, which the float 43 needs to block, circular, it is ensured that the float 43 can seamlessly block the corresponding holes, and the sealing effect will not be affected regardless of the angle of rotation of the float 43 within the liquid.

[0039] In this embodiment, the cross-sectional area of ​​the valve cavity 42 minus the maximum cross-sectional area of ​​the float 43 should be greater than or equal to the cross-sectional area of ​​the first inlet pipe 5. The valve cavity 42 needs to be set relatively large because the float 43 needs to change position to selectively block the second hole 412 and the third hole 413. If the cross-sectional area of ​​the valve cavity 42 is too small, when the float 43 blocks the third hole 413, the liquid pumped into the first inlet pipe 5 by the water pump 3 will push the float 43 open, causing the float 43 to fail to block, and thus causing the circulation to fail. At the same time, if the cross-sectional area of ​​the valve cavity 42 is too small, when the float 43 blocks the third hole 413, the liquid will be obstructed in the process of flowing from the first hole 411 to the second hole 412, resulting in liquid flow loss.

[0040] Preferably, the valve body 41 is cylindrical, the first hole 411 is located at the bottom center of the valve body 41, the second hole 412 is located at the top center of the valve body 41, and the third hole 413 is located at the center in the height direction of the valve body 41.

[0041] Although embodiments of the invention have been described above with reference to the accompanying drawings, the invention is not limited to the above embodiments, but can be made in various forms, and those skilled in the art will understand that the invention can be implemented in other specific forms without changing the technical spirit or essential characteristics of the invention. Therefore, it should be understood that the above embodiments are exemplary in all respects and not restrictive.

Claims

1. A liquid circulation mechanism, characterized in that, The system includes a control valve and a water pipe assembly. The control valve includes a valve body with a valve cavity inside, and a float ball is installed inside the valve cavity. The water pipe assembly includes a first inlet pipe, a first outlet pipe, a second inlet pipe, and a second outlet pipe. One end of the first inlet pipe is connected to the outlet of a water pump located in a first container, and the other end is connected to a first hole at the bottom of the valve body. One end of the first outlet pipe is connected to a second hole on the valve body, and the other end is connected to the first container. One end of the second inlet pipe is inserted below the liquid surface in the second container, and the other end is connected to a non-end position of the first outlet pipe. One end of the second outlet pipe is connected to a third hole on the valve body, and the other end is connected to the second container. The third hole is located on the side wall of the valve body. The height of the second container is greater than the height of the first container. The second hole, the third hole, and the first hole are arranged vertically from top to bottom at intervals. The density of the float is less than the density of the liquid in the valve body. The float selectively blocks the second hole and the third hole. By using the control valve with the float, when the water pump continuously pumps liquid into the first inlet pipe, the liquid level in the valve cavity gradually increases, first reaching the position of the third hole. The liquid enters the second outlet pipe through the third hole and then flows into the second container. The thrust generated by the liquid flow pushes the float to the third hole to block it. At the third orifice, the second outlet pipe stops discharging liquid, and the liquid level in the valve body continues to rise to the second orifice, entering the first outlet pipe through the second orifice. The first outlet pipe then transports the liquid to the first container. During the liquid transport process, the liquid in the first outlet pipe moves downwards due to gravity, forming a siphon. This creates a negative pressure at the connection between the first outlet pipe and the second inlet pipe, causing the second inlet pipe to draw liquid from the second container into the first outlet pipe for delivery to the first container. During this process, the siphon effect in the first outlet pipe creates a negative pressure at the second orifice, controlling the liquid flow in the valve. The float is drawn towards the first outlet pipe, and is driven by the liquid to move from the third hole to the second hole, sealing the second hole. The siphon effect in the first outlet pipe also attracts the float to the second hole, sealing it. The siphon effect is maintained, allowing the second inlet pipe to deliver liquid into the first outlet pipe, while the first outlet pipe delivers the liquid to the first container. The water pump continuously delivers liquid to the valve chamber through the first inlet pipe, while the third hole remains open, allowing the second outlet pipe to continuously deliver the liquid from the first container to the second container, thus achieving liquid circulation between the first and second containers.

2. The liquid circulation mechanism according to claim 1, characterized in that, The end of the first inlet pipe away from the valve body is adjacent to the bottom of the first container.

3. The liquid circulation mechanism according to claim 1, characterized in that, The second water inlet pipe is provided with a vent hole, which is located near the end of the second water inlet pipe that connects to the first water outlet pipe. The vent hole is lower than or equal to the position where the liquid level in the second container needs to be maintained.

4. The liquid circulation mechanism according to claim 1, characterized in that, The float is spherical, and the cross-sections of the third hole and the second hole are both circular, with the diameters of both the third hole and the second hole being smaller than the diameter of the float.

5. The liquid circulation mechanism according to any one of claims 1 to 4, characterized in that, The cross-sectional area of ​​the valve cavity minus the maximum cross-sectional area of ​​the float is greater than or equal to the cross-sectional area of ​​the first inlet pipe.

6. The liquid circulation mechanism according to any one of claims 1 to 4, characterized in that, The second hole is provided on the top or side wall of the valve body.

7. The liquid circulation mechanism according to any one of claims 1 to 4, characterized in that, The end of the second outlet pipe away from the valve body is located above the liquid surface of the second container, and the end of the second inlet pipe away from the first outlet pipe is adjacent to the bottom of the second container.

8. A liquid circulation device, comprising a first container, a second container, and a water pump, characterized in that, It also includes a liquid circulation mechanism as described in any one of claims 1 to 7, wherein the height of the second container is greater than the height of the first container, the water pump is disposed inside the first container, the outlet end of the water pump is connected to the second container through the water pipe assembly of the liquid circulation mechanism, wherein the outlet end of the water pump is connected to one end of the first inlet pipe of the water pipe assembly, the other end of the first inlet pipe is connected to the first hole at the bottom of the valve body of the control valve of the liquid circulation mechanism, one end of the first outlet pipe of the water pipe assembly is connected to the second hole on the valve body, and the other end is connected to the first container, one end of the second inlet pipe of the water pipe assembly is located below the liquid surface of the second container, and the other end is connected to the non-end position of the first outlet pipe, one end of the second outlet pipe of the water pipe assembly is connected to the third hole on the valve body, and the other end is connected to the second container.

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