Efficient energy-saving circulating water pump

Abstract

The invention discloses a circulating water efficient energy-saving water pump, which belongs to the technical field of centrifugal pumps and comprises a horizontal pump body, an impeller and a rotating shaft are arranged in the pump body, a pipe inlet and a pipe outlet are arranged on the pump body, the pipe inlet is positioned at the axial position of the impeller, the pipe outlet is positioned at the radial position of the impeller, and a water storage barrel is mounted on one side, far away from the pipe inlet, of the impeller. The water storage barrel coaxially rotates along with the impeller, a water inlet hole and a water outlet hole which penetrate through the impeller are formed in the end of the water storage barrel, the water inlet hole and the water outlet hole are both located in a semi-working area on the surface of the impeller, the water inlet hole and the water outlet hole are one-way through holes, and a centrifugal control mechanism is further arranged on the water storage barrel and used for controlling the impeller to rotate when centrifugal force generated by rotation of the water storage barrel exceeds a rated value. And the water outlet hole and the water storage barrel are controlled to be communicated. Liquid is stored through the water storage barrel, when the impeller rotates, water can be thrown out through the water outlet holes, the pump body is filled with water, operation of the water pump is guaranteed, water does not need to be added from the outside, energy consumption is reduced, and the operation efficiency of the water pump is improved.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, and in particular to a high-efficiency and energy-saving circulating water pump. Background Technology

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. It is commonly used in the circulation and transportation of liquids. Before starting a centrifugal pump, the pump casing and suction pipe must be filled with water. Then, the motor is started, causing the pump shaft to drive the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown towards the outer edge of the impeller, flowing into the pump's discharge pipe through the flow channel of the volute casing. If the pump is not filled with water, or if air leaks in during operation, the impeller only drives the air inside the pump to rotate. Since the density of air is much lower than that of liquid, the centrifugal force generated is small, and the vacuum formed at the suction inlet is insufficient to draw liquid into the pump.

[0003] There are two main methods for filling traditional centrifugal pumps with water: one is to manually fill the pump body using a foot valve; the other is a foot valve-less method, which achieves automatic priming and venting through external auxiliary devices or structural design. The core advantage of this method is reduced pipeline resistance and improved pump operating efficiency. While foot valve filling is simple in structure, it relies on manual labor, while the foot valve-less method, although highly efficient, has a complex structure and increases operating costs. Therefore, it is difficult for existing centrifugal pumps to simultaneously achieve the advantages of high efficiency and energy saving. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency and energy-saving circulating water pump to solve the problem of insufficient efficiency and energy saving of the above-mentioned circulating water pumps. It has the advantages of not requiring external structural drive, automatic water filling, simple and convenient operation, and high efficiency and energy saving.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A high-efficiency and energy-saving circulating water pump includes a horizontally oriented pump body. An impeller and a rotating shaft are disposed within the pump body. An inlet and an outlet are provided on the pump body. The inlet is located axially on the impeller, and the outlet is located radially on the impeller. A water storage tank is installed on the side of the impeller away from the inlet. The water storage tank rotates coaxially with the impeller. An inlet and outlet hole penetrating the impeller are provided at the end of the water storage tank. The impeller surface is divided into two semi-working zones, with both the inlet and outlet holes located within these zones. The inlet and outlet holes are unidirectional through holes. A centrifugal control mechanism is also provided on the water storage tank to control the outlet hole to remain connected to the water storage tank when the centrifugal force generated by the rotation of the water storage tank exceeds a rated value.

[0007] Preferably, a protrusion is provided in the pump body near the inlet, so that a water accumulation cavity is formed inside the pump body with a height lower than the top of the protrusion.

[0008] Preferably, the centrifugal control mechanism includes a moving channel penetrating the inner and outer walls of the water storage tank. A reciprocating piston is installed in the moving channel, and an elastic element that provides a rebound force against the centrifugal force is also installed on the piston. The water outlet is connected to the moving channel, and the connection point is located on the moving path of the piston, dividing the moving channel into two sections. The section between the connection point and the water storage tank is the first channel section, and the other section is the second channel section. When the centrifugal force is greater than the elastic force, the piston moves to the second channel section, and the water outlet is connected to the water storage tank. When the elastic force is greater than the centrifugal force, the piston moves to the first channel section, and the water outlet is disconnected from the water storage tank.

[0009] Preferably, the end of the moving channel away from the water storage tank is inclined toward the impeller.

[0010] Preferably, the end of the water storage tank is connected to the impeller via a mounting base, the diameter of the mounting base is larger than the diameter of the water storage tank, and the moving channel is located inside the mounting base.

[0011] Preferably, the elastic element is a return spring, and a blocking block is provided at the end of the moving channel away from the water storage tank. The return spring is installed between the piston and the blocking block, and a communication hole is also provided on the blocking block for the moving channel to communicate with the outside.

[0012] Preferably, an inlet check valve is installed in the water inlet hole, and an outlet check valve is installed in the water outlet hole.

[0013] Preferably, multiple water outlets are provided, and the total area of ​​the water outlets is not greater than the area of ​​the water inlet.

[0014] Preferably, the water storage tank is a hollow cylindrical structure with an internal sleeve that is fixed to the rotating shaft. The outer wall of the water storage tank is connected to the pump body through a sealed bearing.

[0015] Preferably, the top of the pump body is also provided with a reflux chamber, the bottom of which is connected to the inside of the pump body through a reflux hole, and the other end is connected to the inlet pipe. A water injection valve connected to the reflux chamber is also installed on the pump body.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention stores liquid in a water storage tank. When the impeller rotates, water is ejected through the outlet to fill the pump body, ensuring pump operation. No external water supply is required, saving energy and improving pump efficiency. This filling method utilizes impeller rotation, eliminating the need for additional power to control the water tank's output; it is driven by centrifugal force, making operation simple and convenient. Furthermore, the water storage tank is equipped with an inlet, allowing water to be added simultaneously with the discharge, ensuring the tank's continued usability. The circulation between the inlet and outlet maintains stable water pressure within the storage tank.

[0017] 2. This invention sets both the inlet and outlet ports in the semi-circular area of ​​the impeller, and the pump is a horizontal pump. This, combined with the water accumulation chamber inside the pump body, reduces the centrifugal force on the liquid in the storage tank as the impeller rotates slower. When the inlet and outlet ports are in the upper part of the pump body, the centrifugal control mechanism is insufficient to open the outlet port and the storage tank, reducing the water output. When the inlet and outlet ports are in the lower part of the pump body, the water accumulated in the water accumulation chamber can enter the storage tank in time to maintain the water intake, avoiding the situation where the water output from the storage tank exceeds the water intake, resulting in insufficient water in the storage tank and preventing the impact on the secondary use of the pump. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the pump body of the present invention.

[0019] Figure 2 This is a schematic diagram showing the distribution of the inlet and outlet holes on the impeller according to the present invention.

[0020] Figure 3 This is a schematic diagram of the water storage tank structure of the present invention.

[0021] Figure 4 This is a magnified structural diagram of region A of the present invention.

[0022] In the diagram: 1. Pump body, 2. Impeller, 3. Inlet pipe, 4. Outlet pipe, 5. Water injection valve, 6. Return hole, 7. Return chamber, 8. Protrusion, 9. Water accumulation chamber, 10. Water storage tank, 11. Mounting base, 12. Sealed bearing, 13. Shaft, 14. Water inlet, 15. Water outlet, 16. Inlet check valve, 17. Outlet check valve, 18. Centrifugal control mechanism, 19. Moving channel, 20. Piston, 21. Return spring, 22. Sealing block, 23. Connecting hole. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] like Figure 1As shown, a high-efficiency and energy-saving circulating water pump includes a horizontally oriented pump body 1. An impeller 2 and a rotating shaft 13 are disposed within the pump body 1. An inlet 3 and an outlet 4 are provided on the pump body 1. The inlet 3 is located axially on the impeller 2, and the outlet 4 is located radially on the impeller 2. Water pumps can be clearly classified into vertical pumps and horizontal pumps according to the installation direction of the pump shaft. This application pertains to a horizontal pump, and subsequent structural improvements to the pump will be based on the horizontal pump design, without considering the case of vertical pumps. Figure 1 It can be seen that the pump body 1 and the rotating shaft are both placed horizontally. The rotating shaft 13 is responsible for driving the impeller 2. One end of the rotating shaft 13 extends out of the pump body 1 and is connected to the motor or engine. The overall layout is horizontal and straight. In order for the water pump to operate normally, the inlet 3 is usually aligned with the axial position of the impeller 2. Water is drawn into the pump body 1 by negative pressure. The outlet 4 is located in the radial position of the impeller 2. The impeller 2 is used to throw the water out of the pump body 1. Most water pumps used for circulation are centrifugal pumps. Centrifugal pumps are mature liquid transportation devices, and their principle will not be elaborated here. As mentioned in the background technology above, water needs to be added to the pump body 1 before the water pump can operate. Otherwise, a negative pressure environment cannot be formed, and the impeller 2 will not be able to draw water in through the inlet 3 even when it rotates. To address this technical problem, this application achieves automatic water replenishment of the water pump through a mechanical structure that can automatically replenish water without additional power, thus ensuring the operation of the water pump. The following is a description of the specific structure and principle of achieving automatic water replenishment.

[0025] like Figure 2 and Figure 3As shown, a water storage tank 10 is installed on the side of the impeller 2 away from the inlet 3. The water storage tank 10 rotates coaxially with the impeller 2. The end of the water storage tank 10 is provided with an inlet hole 14 and an outlet hole 15 that penetrate the impeller 2. The surface of the impeller 2 is divided into two semi-working areas. The inlet hole 14 and the outlet hole 15 are both located in the semi-working areas. The inlet hole 14 and the outlet hole 15 are unidirectional through holes. A centrifugal control mechanism 18 is also provided on the water storage tank 10, which is used to control the outlet hole 15 to be in a connected state with the water storage tank 10 when the centrifugal force generated by the rotation of the water storage tank 10 exceeds the rated value. As mentioned above, impeller 2 rotates by transmitting power from the motor via shaft 13. Therefore, by mounting water storage tank 10 on impeller 2, water storage tank 10 can also rotate. Since water storage tank 10 and impeller 2 rotate coaxially, it means that water storage tank 10 also rotates around shaft 13. During rotation, the water inside water storage tank 10 is subjected to centrifugal force. When there is an opening in water storage tank 10, water will be thrown out through the opening, replenishing water inside pump body 1, equivalent to external water injection. However, the water here is supplied by the water storage tank 10. The water in the water storage tank 10 can be manually injected when the water pump is used for the first time. In subsequent uses, because the water inlet 14 and the water outlet 15 are opened on the water storage tank 10, the water outlet 15 is used to inject the water in the water storage tank 10 into the pump body 1, and the water inlet 14 is used to inject the water in the pump body 1 into the water storage tank 10. Therefore, through this process of circulating water inlet and outlet, the water storage tank 10 is always filled with water. In this way, except for the first water filling, no water filling is required for subsequent use.

[0026] The water circulation process of the water storage tank 10 mentioned above is achieved through the centrifugal control mechanism 18. The principle of the water circulation process of the water storage tank 10 is described in detail below: The inlet hole 14 and the outlet hole 15 are unidirectional through holes. This means that the inlet hole 14 can only allow water from the pump body 1 to enter the water storage tank 10, and the outlet hole 15 can only allow water from the water storage tank 10 to enter the pump body 1. Only this one-in-one-out working mode can maintain the water circulation of the water storage tank 10. Otherwise, if the water storage tank 10 has no other through holes, a single outlet or a single inlet will not be possible due to the air pressure inside the water storage tank 10. The inlet hole 14 is normally open. For water in the water storage tank 10 to flow out of the outlet hole 15, the centrifugal control mechanism 18 needs to activate the outlet hole 15 only when the centrifugal force exceeds the rated value after the water storage tank 10 has rotated. This is the reason for this design: First, if the water outlet 15 is always in the water-discharging state, the water storage tank 10 will not have any water stored, and the next use of the water pump cannot be guaranteed. Secondly, the process of replenishing water from the storage tank 10 to the pump body 1 is understandable. As the impeller 2 rotates faster and faster, the centrifugal force gradually increases, so there is enough pressure in the storage tank 10 to force water to be discharged from the outlet 15, and the pump body 1 gradually fills with water. The inlet 14 can also replenish water in time when water is discharged from the outlet 15. However, when the pump is turned off, the rotation speed of the impeller 2 will gradually decrease until it stops, and the pump body 1 will no longer have the ability to draw water from the inlet 3, which will cause the water level in the pump body 1 to drop. If water is discharged from the outlet 15 when the centrifugal force is small, then the inlet 14 will no longer be filled with water, but with a large amount of air, which will reduce the water storage in the storage tank 10 and will also be insufficient for the pump to be used next time.

[0027] To ensure that the water storage tank 10 can maintain a sufficient water volume during both the start and stop phases of the water pump, such as Figure 2 As shown, the inlet hole 14 and outlet hole 15 are positioned within the half-working zone of the impeller 2, not both half-working zones. While this design reduces the drainage volume, the rotating impeller 2 ensures that the liquid ejected from the outlet hole 15 forms a circular spray pattern, not affecting the water pump's injection effect. Furthermore, the placement of the inlet hole 14 and outlet hole 15 better prevents the water inlet volume of the storage tank 10 from being less than the outlet volume. According to... Figure 1 As can be seen, pump body 1 is placed horizontally. Therefore, even if the pump stops working, the water inside pump body 1 will eventually accumulate near the bottom, while the upper part of pump body 1 will be dry. When impeller 2 rotates to the point where both inlet hole 14 and outlet hole 15 are in the dry area, water will flow from outlet hole 15, but air can only enter through inlet hole 14. When impeller 2 rotates to the point where both inlet hole 14 and outlet hole 15 are in the water-filled area at the bottom, water will still flow from outlet hole 15, but water will be submerged in inlet hole 14. To maximize water intake, and with a certain water pressure in the accumulated water, the outlet 15 can discharge a small amount of water and a large amount of air. Because air is insoluble in water, when there is external water pressure, water is not easily discharged from the outlet 15, but the gas is not affected. This discharges excess air from the water storage tank 10, making room for water intake. If the inlet 14 and outlet 15 are located in two and a half working areas, even if the inlet 14 is submerged in water and the outlet 15 is in a waterless area, air will still enter, making it difficult for the water storage tank 10 to be filled.

[0028] To increase the water depth and enhance the water intake of the inlet 14, a protrusion 8 is provided inside the pump body 1 near the inlet pipe 3, forming a water-accumulating cavity 9 inside the pump body 1 with a height lower than the top of the protrusion 8. As mentioned above, water accumulation can increase the water storage capacity of the storage tank 10. Due to the rotation of the impeller 2, the inlet 14 and outlet 15 move in a circular motion. If the inlet 14 and outlet 15 are in the water-accumulating area for a longer period of time, the water intake of the storage tank 10 can naturally be increased. Therefore, by providing the protrusion 8 to form a water-accumulating cavity 9 that can accommodate a higher water level, the time that the inlet 14 and outlet 15 are in the water-accumulating area is extended.

[0029] like Figure 3 and Figure 4 The diagram shows the specific structure of the centrifugal control mechanism 18. The centrifugal control mechanism 18 includes a moving channel 19 that penetrates the inner and outer walls of the water storage tank 10. A reciprocating piston 20 is installed inside the moving channel 19. An elastic element that provides a rebound force against the centrifugal force is also installed on the piston 20. The water outlet 15 is connected to the moving channel 19. The connection point is located on the moving path of the piston 20, dividing the moving channel 19 into two sections. The section between the connection point and the water storage tank 10 is the first channel section, and the other section is the second channel section. When the centrifugal force is greater than the elastic force, the piston 20 moves to the second channel section, and the water outlet 15 is in a conductive state with the water storage tank 10. When the elastic force is greater than the centrifugal force, the piston 20 moves to the first channel section, and the water outlet 15 is in a disconnected state with the water storage tank 10. The moving channel 19 serves as an intermediate connecting member between the water outlet 15 and the water storage tank 10. Since a piston 20 is installed within the moving channel 19, when the water storage tank 10 rotates, the piston 20 is also subjected to centrifugal force, moving away from the water storage tank 10. The elastic element acts as a reset mechanism for the piston 20. When the rotation speed of the water storage tank 10 slows down or stops completely, the centrifugal force on the piston 20 disappears, and the elastic force of the elastic element can push the piston 20 back to its original position. The connection between the water outlet 15 and the moving channel 19 is located on the first channel segment. Therefore, when… When piston 20 is located in the first channel section, the water outlet 15, the first channel section, and the water storage tank 10 cannot form a connected state and are blocked by piston 20. In order to ensure that the connection between the water outlet 15 and the water storage tank 10 is generated when the centrifugal force of the rotating water storage tank 10 is greater than the rated value, piston 20 is in the first channel section by default. When piston 20 is subjected to centrifugal force and enters the second channel section, the water outlet 15, the first channel section, and the water storage tank 10 are connected, and the water in the water storage tank 10 can be discharged through the water outlet 15.

[0030] Therefore, it is necessary to accurately select elastic elements with appropriate elasticity so that the elasticity of the element can be balanced with the centrifugal force of the piston 20. Figure 4As shown, the end of the moving channel 19 furthest from the water storage tank 10 is inclined towards the impeller 2. Since the selection of the elastic force of the elastic element is crucial, and the performance of the elastic element alone cannot accurately predict whether it can balance the centrifugal force, the moving channel 19 is designed with an inclined structure to reduce the difficulty of selecting the elastic element. This is because if the moving channel 19 were set perpendicular to the outer wall of the water storage tank 10, the following situation would occur: the piston 20 would move vertically within the moving channel 19, resulting in the greatest centrifugal force and a large compressive force on the elastic element. In particular, the piston 20 itself has a certain weight. For example, when the impeller 2 rotates to the point where the inlet hole 14 and outlet hole 15 are located in the upper part of the pump body 1, the weight of the piston 20 is downward, providing a pulling force on the elastic element. When the impeller 2 rotates to the lower half of the pump body 1, the weight of the piston 20 is reduced, providing a force to compress the elastic element. At this time, the centrifugal force drives the piston 20 to move upward and open the water outlet 15. Then, the centrifugal force drives the piston 20 to move downward and open the water outlet 15. Then, it is not necessary to overcome the weight of the piston 20. Instead, the centrifugal force and the weight are superimposed to apply the force to compress the elastic element. Thus, a smaller centrifugal force is needed to open the water outlet 15.

[0031] When the impeller 2 starts, its rotational speed gradually increases, and when it stops, its rotational speed gradually decreases. As mentioned above, when filling the pump body 1 with water, it is desirable for the outlet 15 to drain water quickly, and when filling the water storage tank 10 with water, it is desirable for the outlet 15 to drain water more slowly. However, the vertically arranged moving channel 19 will be affected by the weight of the piston 20, which will affect the elastic force selection of the elastic element and prevent it from reaching the desired working state. Therefore, in order to reduce the influence of the weight of the piston 20, the moving channel 19 is set to be inclined. In this way, the gravity is not vertically downward, which reduces the influence on the elastic force of the elastic element. This allows for the selection of an elastic element with an accurate elastic force and also avoids the situation where the force applied to the elastic element is too large, causing premature fatigue damage to the elastic element.

[0032] Because the moving channel 19 is inclined, it needs to penetrate through the inner and outer walls of the water storage tank 10, and the moving channel 19 needs to be long enough for the piston 20 to move. Figure 3 As shown, the end of the water storage tank 10 is connected to the impeller 2 via a mounting base 11. The diameter of the mounting base 11 is larger than the diameter of the water storage tank 10, and the moving channel 19 is located inside the mounting base 11. The mounting base 11 can increase the thickness of the end of the water storage tank 10, so that when the moving channel 19 is opened inside the mounting base 11, it has a certain thickness and can communicate with the water storage tank 10.

[0033] like Figure 4As shown, the elastic element is a return spring 21. A blocking block 22 is provided at the end of the moving channel 19 away from the water storage tank 10. The return spring 21 is installed between the piston 20 and the blocking block 22. The blocking block 22 also has a connecting hole 23 for the moving channel 19 to communicate with the outside. The moving channel 19 can be connected to the water storage tank 10 by drilling from the outside to the inside during processing. The water outlet 15 can also be connected to the moving channel 19 by drilling from the outside to the inside. Therefore, in order to facilitate the installation of the return spring 21, the blocking block 22 is set to block the moving channel 19 and provide support for the return spring 21. Moreover, in order for the piston 20 to move normally, the connecting hole 23 of the blocking block 22 makes the second channel section of the moving channel 19 consistent with the external air pressure, ensuring the normal movement of the piston 20.

[0034] A one-way valve 16 is installed inside the inlet hole 14, and a one-way valve 17 is installed inside the outlet hole 15. The presence of these one-way valves ensures that water can only enter through the inlet hole 14 and exit through the outlet hole 15 in one direction. Multiple outlet holes 15 are provided, and the total area of ​​the outlet holes 15 is no larger than the area of ​​the inlet hole 14. Multiple outlet holes 15 increase the water filling range when filling the pump body 1, accelerating the process of expelling air and forming a vacuum within the pump body 1. The total area of ​​the outlet holes 15 must be the same as or slightly smaller than the area of ​​the inlet holes to prevent the water outlet from exceeding the inlet water, which could lead to insufficient water replenishment in the storage tank 10.

[0035] The water storage tank 10 is a hollow cylindrical structure with an internal sleeve that is fixed to the rotating shaft 13. The outer wall of the water storage tank 10 is connected to the pump body 1 through a sealed bearing 12. As mentioned above, the water storage tank 10 rotates around the rotating shaft 13. In order to make the rotation more stable and prevent polarization, the water storage tank 10 is designed as a cylindrical structure, which makes the rotation more stable.

[0036] The pump body 1 is also provided with a return chamber 7 at the top. The bottom of the return chamber 7 is connected to the inside of the pump body 1 through the return hole 6, and the other end is connected to the inlet pipe 3. The pump body 1 is also equipped with a water injection valve 5 connected to the return chamber 7. The water injection valve 5 is used to inject water into the pump body 1. For example, as mentioned above, when the device is used for the first time, water can be injected into the pump body 1 manually to ensure the normal operation of the water pump. During operation, the water storage tank 10 is gradually filled with water. In this way, even without subsequent water injection, water can be injected into the pump body 1 from the water storage tank 10. The return chamber 7 and the return hole 6 are both to ensure that the water injection can eliminate the air in the pump body 1 and make the pump body 1 form a vacuum state.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A circulating water high-efficiency energy-saving water pump, comprising a horizontal pump body (1), an impeller (2) and a rotating shaft (13) arranged in the pump body (1), an inlet pipe opening (3) and an outlet pipe opening (4) arranged on the pump body (1), the inlet pipe opening (3) being located at an axial position of the impeller (2), and the outlet pipe opening (4) being located at a radial position of the impeller (2), characterized in that, The impeller (2) is installed with a water storage bucket (10) on the side far from the inlet pipe (3), the water storage bucket (10) rotates coaxially with the impeller (2), the end of the water storage bucket (10) is provided with a water inlet hole (14) and a water outlet hole (15) penetrating the impeller (2), the surface of the impeller (2) is divided into two half working areas, the water inlet hole (14) and the water outlet hole (15) are located in the half working areas, the water inlet hole (14) and the water outlet hole (15) are one-way through holes, the water storage bucket (10) is further provided with a centrifugal control mechanism (18) for controlling the water outlet hole (15) to be in a communication state with the water storage bucket (10) when the centrifugal force generated by the rotation of the water storage bucket (10) exceeds a rated value.

2. A high efficiency pump for circulating water as claimed in claim 1 wherein, The pump body (1) is provided with a protruding part (8) near the inlet pipe (3), so that a water accumulation cavity (9) with a height lower than the top of the protruding part (8) is formed in the pump body (1).

3. The energy efficient water pump for circulating water as claimed in claim 1 wherein, The centrifugal control mechanism (18) comprises a moving channel (19) penetrating the inner and outer walls of the water storage bucket (10), a reciprocating piston (20) is installed in the moving channel (19), an elastic member providing a spring force opposite to the centrifugal force is further installed on the piston (20), the water outlet hole (15) is in communication with the moving channel (19), the communication position is located on the moving path of the piston (20) and divides the moving channel (19) into two sections, the first channel section is between the communication position and the water storage bucket (10), and the second channel section is the other section, the piston (20) moves to the second channel section when the centrifugal force is greater than the spring force, the water outlet hole (15) is in a conductive state with the water storage bucket (10), and the piston (20) moves to the first channel section when the spring force is greater than the centrifugal force, so that the water outlet hole (15) is in a disconnected state with the water storage bucket (10).

4. The energy efficient water pump for circulating water as claimed in claim 3 wherein, The end of the moving channel (19) far from the water storage bucket (10) is inclined towards the direction of the impeller (2).

5. A high efficiency pump for circulating water according to claim 4, wherein The end of the water storage bucket (10) is connected with the impeller (2) through a mounting seat (11), the diameter of the mounting seat (11) is greater than that of the water storage bucket (10), and the moving channel (19) is arranged in the mounting seat (11).

6. The energy efficient water pump for circulating water as claimed in claim 3 wherein, The elastic member is a return spring (21), a blocking block (22) is arranged at the end of the moving channel (19) far from the water storage bucket (10), the return spring (21) is installed between the piston (20) and the blocking block (22), and a communication hole (23) for connecting the moving channel (19) with the outside is formed in the blocking block (22).

7. The energy efficient water pump for circulating water as claimed in claim 1 wherein, A water inlet one-way valve (16) is installed in the water inlet hole (14), and a water outlet one-way valve (17) is installed in the water outlet hole (15).

8. The energy efficient water pump for circulating water as claimed in claim 1 wherein, A plurality of water outlet holes (15) are arranged, and the total area of the water outlet holes (15) is not greater than the area of the water inlet hole (14).

9. The energy efficient water pump for circulating water as claimed in claim 1 wherein, The water storage bucket (10) has a hollow cylindrical structure, a sleeve is arranged in the water storage bucket (10), the sleeve is fixed on the rotating shaft (13) through the sleeve, and the outer wall of the water storage bucket (10) is connected with the pump body (1) through a sealing bearing (12).

10. The energy efficient water pump for circulating water as claimed in claim 1 wherein, The pump body (1) is also provided with a return cavity (7) at the top. The bottom of the return cavity (7) is connected to the inside of the pump body (1) through a return hole (6), and the other end is connected to the inlet (3). A water injection valve (5) connected to the return cavity (7) is also installed on the pump body (1).

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