A hot water circulation pump and a control method for low-cavitation hot water circulation

Abstract

The present invention belongs to the technical field of water pumps, and specifically relates to a hot water circulation pump and a control method for low-cavitation hot water circulation, including a first motor, a coupling assembly, and a pump body. The coupling assembly is installed between the first motor and the pump body; on both sides inside the top of the pump body, a water inlet chamber and a water outlet chamber are respectively provided, and an impeller chamber is provided inside the pump body and below the water outlet chamber; a water inlet and outlet adjustment module, and the water inlet and outlet adjustment module is installed in the water inlet chamber and the water outlet chamber. By changing the internal structure of the pump body and the impeller structure, the diameters of the water inlet and outlet of the pump body can be adjusted, and at the same time, the blades of the impeller can be deflected at an angle. According to different speeds of the impeller, the water inlet and outlet of different diameters and the blades at different angles are adjusted to adapt to the flow direction and velocity distribution of the liquid under different speeds of the impeller, so as to reduce the local pressure drop and further reduce the risk of cavitation.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pumps, and particularly relates to a hot water circulation pump and a control method for low-cavitation hot water circulation. Background Art

[0002] A hot water circulation pump is a device that provides energy through a power unit to keep water flowing in a closed-loop system. Its core components include an electric motor and an impeller. The electric motor drives the impeller to rotate, forming a negative pressure area to suck in and accelerate water, and then the water flow is pushed into the system through the discharge chamber. This process ensures the continuous flow of hot water in the pipeline, avoids the decrease in water temperature due to local stagnation, and guarantees the efficiency and stability of the heating system. In households, commercial buildings, and industrial applications, hot water circulation pumps play a key role. They can not only improve the efficiency of hot water supply, reduce the waiting time for hot water, but also save water resources and energy. In addition, the use of hot water circulation pumps helps to extend the service life of equipment such as water heaters and reduce the maintenance cost of equipment. Cavitation refers to the phenomenon that during the operation of a water pump, due to the local pressure being lower than the saturated vapor pressure of water, water vaporizes to form bubbles. When these bubbles enter the high-pressure area with the water flow, they will quickly collapse and generate shock waves, resulting in damage to the pump body material. This phenomenon is cavitation. Cavitation usually occurs at the inlet of the pump and components such as the impeller, especially when pumping high-temperature and low-boiling-point media. Cavitation will cause various adverse effects on the hot water circulation pump. It will accelerate the damage of the pump casing and impeller, shorten the service life of the pump, cause the performance of the pump to decline, such as a decrease in head, flow rate, and efficiency. Cavitation will also increase the vibration and noise of the pump, affecting the normal operation of the pump and the working environment;

[0003] In the design and application of existing hot water circulation pumps, it is often difficult to completely avoid the occurrence of cavitation, especially when transporting high-temperature and low-boiling-point media, the cavitation problem is more prominent. In addition, the design of existing pumps focuses more on improving energy efficiency and flow rate, while relatively less optimization is carried out in terms of cavitation resistance performance. And in the adjustment of the impeller speed, the blade angle cannot fully adapt to the changed speed, which will lead to uneven internal pressure distribution inside the pump body, thus making it more likely to generate cavitation. Summary of the Invention

[0004] The purpose of the present invention is to provide a hot water circulation pump and a control method for low-cavitation hot water circulation. By changing the internal structure of the pump body and the impeller structure, the diameters of the inlet and outlet of the pump body can be adjusted, and at the same time, the blades of the impeller can be deflected in angle. According to different speeds of the impeller, the inlet and outlet with different diameters and the blades with different angles are adjusted to adapt to the flow direction and velocity distribution of the liquid under different speeds of the impeller, thereby reducing the local pressure drop and further reducing the risk of cavitation.

[0005] The technical solutions adopted by the present invention are specifically as follows:

[0006] A hot water circulation pump and a control method for low-cavitation hot water circulation, including a first motor, a coupling assembly and a pump body, the coupling assembly is installed between the first motor and the pump body;

[0007] On both sides inside the top of the pump body, a water inlet chamber and a water outlet chamber are respectively provided, and an impeller chamber is provided inside the pump body and below the water outlet chamber;

[0008] An inlet and outlet water regulation module, the inlet and outlet water regulation module is installed in the water inlet chamber and the water outlet chamber, the inlet and outlet water regulation module includes two inlet and outlet regulation discs, the two inlet and outlet regulation discs are respectively rotatably installed inside the water inlet chamber and the water outlet chamber, and a number of first water passing holes with different diameters are evenly arranged on the outer side of the inlet and outlet regulation discs;

[0009] An impeller regulation module, the impeller regulation module is installed inside the impeller chamber, the impeller regulation module includes a back plate and blades, one side of the back plate is connected to the coupling assembly, and a number of synchronously rotatable blades are evenly installed on the other side surface of the back plate.

[0010] In a preferred solution, water inlet pipes and water outlet pipes are respectively fixed on both sides of the top of the pump body, the water inlet pipes are communicated with the water inlet chamber, the water outlet pipes are communicated with the water outlet chamber, a first channel and a second channel are further arranged inside the pump body, the water inlet chamber is communicated with the impeller chamber through the first channel, and the water outlet chamber is communicated with the impeller chamber through the second channel.

[0011] In a preferred solution, a second water passing hole is provided on one side of the inlet and outlet regulation disc, and the second water passing holes on the two inlet and outlet regulation discs are respectively aligned with the water inlet pipe and the water outlet pipe.

[0012] In a preferred solution, a rotation regulation member is installed on one side of the middle part of the inlet and outlet regulation disc, a ratchet tooth is provided inside the rotation regulation member, the directions of the ratchet teeth in the two rotation regulation members are opposite, a rotating shaft is rotatably connected between the two inlet and outlet regulation discs, a first bevel gear is fixed in the middle of the rotating shaft, a second motor is fixed on the top of the pump body, a second bevel gear is fixed at the output end of the second motor, and the second bevel gear is meshed with the first bevel gear;

[0013] Rotating discs are installed at both ends of the rotating shaft, a ratchet pawl is rotatably connected to the outside of the rotating disc, the ratchet pawls arranged on the two rotating discs face in opposite directions, and an elastic sheet is installed on the rotating disc below the ratchet pawl.

[0014] In a preferred embodiment, a rotating shaft is fixed at one end of the blade and inside the back plate. An extension rod is fixed on the outer side of the rotating shaft. A rotating driving member is rotatably connected to the middle part inside the back plate. A plurality of protruding connecting blocks are evenly arranged on the outer side of the rotating driving member. A driving connecting rod is installed between the protruding connecting block and the extension rod. Both ends of the driving connecting rod are rotatably connected.

[0015] In a preferred embodiment, an external driving block is fixed at one end of the rotating driving member and on one side of the back plate. An adjustment groove is formed in the middle of the external driving block. A third motor is installed inside the pump body. An electric push rod is fixed at the output end of the third motor. An angle adjustment block is fixed at the output end of the electric push rod. The angle adjustment block has the same shape as the adjustment groove formed in the external driving block.

[0016] In a preferred embodiment, a rotating ring is formed on the outer sides of both sides of the inlet and outlet adjustment disc. The rotating ring is located inside the water inlet cavity and the water outlet cavity, and the rotating ring is rotatably connected to the pump body.

[0017] In a preferred embodiment, a temperature detector, a pressure detector and an intelligent control module are arranged inside the pump body.

[0018] In a preferred embodiment, a base is installed at the bottom of the first motor. The first motor is installed at one end of the base, and the pump body is installed at the other end of the base.

[0019] A control method for low-cavitation hot water circulation, which is used for a hot water circulation pump described in any one of the above, includes the following steps:

[0020] S1. Preparation before startup: Check whether the pump body and the first motor are firmly installed, and ensure that the base is not loose. Confirm that the inlet pipe and the outlet pipe are correctly connected and there is no leakage. Check whether a small amount of sealing water is allowed to leak at the shaft seal, not exceeding 20 drops / minute to 25 drops / minute, and determine the impeller rotation speed at startup;

[0021] S2. Adjust the inlet and outlet flow rates: According to the impeller rotation speed, control the rotation of the two inlet and outlet adjustment discs so that the first water passing holes with appropriate diameters are respectively connected to the first channel and the second channel to control the flow rate and pressure of the water inlet cavity and the water outlet cavity, and ensure that the second water passing holes on the inlet and outlet adjustment discs are aligned with the inlet pipe and the outlet pipe to optimize the water flow path;

[0022] S3. Blade angle adjustment: Start the third motor, push the external driving block through the electric push rod, so that the rotating driving member inside the back plate drives the blades to rotate synchronously, and adjust the blade angle to optimize the hydrodynamic performance;

[0023] S4. Monitor the temperature and pressure, use the temperature detector and pressure detector inside the pump body to monitor the temperature and pressure changes during the hot water circulation process in real time. According to the monitoring data, the intelligent control module automatically adjusts the working state of the motor to avoid the occurrence of cavitation phenomenon;

[0024] S5. Shutdown operation. Before shutdown, gradually reduce the rotational speed and power output of the hot water pump to avoid the water hammer effect caused by sudden shutdown. Then turn off the power supply and disconnect the connection with the control system.

[0025] The technical effects achieved by the present invention are as follows:

[0026] Through the set inlet and outlet adjustment module, the present invention can accurately control the inlet flow rate, and can adjust the inlet flow rate according to the rotational speed of the impeller, which can ensure the stable pressure at the inlet of the pump body and avoid the formation of bubbles due to too low pressure. This helps to reduce the occurrence of cavitation and improve the service life of the pump. At the same time, the blades can also adjust the angle according to the change of the impeller rotation speed, so as to optimize the water flow path, reduce eddy currents and turbulences, and further reduce the possibility of bubble formation;

[0027] The inlet and outlet adjustment module provided by the present invention can also adjust the outlet flow rate and synchronously change it according to the change of the impeller rotation speed. Furthermore, it can reduce the pressure drop at the outlet of the pump body and the impact force generated when the bubbles burst, thereby improving the cavitation resistance of the pump. In addition, the adjustable angle design of the blades enables the pump body to maintain the best impeller angle and rotational speed under different working conditions, which not only improves the efficiency of the pump but also enhances the pump's resistance to cavitation;

[0028] By accurately controlling the inlet and outlet flow rates, the present invention can adapt different inlet and outlet water volumes according to different rotational speeds of the impeller, and can avoid unstable phenomena of the pump body caused by too large or too small flow rates, such as pressure fluctuations, water flow oscillations, etc. This helps to maintain the stable operation of the pump body and reduce the failures caused by cavitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the overall structural schematic diagram of the present invention;

[0030] Figure 2 is the sectional connection schematic diagram of the internal structure of the pump body of the present invention;

[0031] Figure 3 is the sectional structural schematic diagram of the pump body of the present invention;

[0032] Figure 4 is the exploded view of the structure of the inlet and outlet adjustment module of the present invention;

[0033] Figure 5 is the sectional structural schematic diagram of the inlet and outlet adjustment disc of the present invention;

[0034] Figure 6 It is a schematic diagram of the partial structure of the inlet and outlet water regulation module of the present invention;

[0035] Figure 7 It is an exploded view of the structure of the impeller regulation module of the present invention;

[0036] Figure 8 It is a schematic diagram of the connection structure between the blade and the driving link of the present invention;

[0037] Figure 9 It is a schematic diagram of the internal sectional structure of the back plate of the present invention;

[0038] Figure 10 It is a schematic diagram of the connection between the pawl and the rotary adjustment member of the present invention.

[0039] In the drawings, the list of components represented by each reference numeral is as follows:

[0040] 1. First motor; 2. Pump body; 3. Inlet and outlet water regulation module; 4. Impeller regulation module; 11. Coupling assembly; 12. Base; 21. Impeller chamber; 22. Inlet chamber; 23. Outlet chamber; 24. Inlet pipe; 25. Outlet pipe; 26. First channel; 27. Second channel; 31. Inlet and outlet adjustment disc; 32. Rotary adjustment member; 33. Rotary ring; 34. Rotating shaft; 35. First bevel gear; 36. Second bevel gear; 37. Rotating disc; 38. Pawl; 39. Second motor; 41. Back plate; 42. Blade; 43. Rotating shaft; 44. Extension rod; 45. Driving link; 46. Rotary driving member; 47. Protruding connecting block; 48. External driving block; 49. Third motor; 50. Electric push rod; 51. Angle adjustment block. Detailed implementation manners

[0041] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be made in conjunction with the accompanying drawings of the specification.

[0042] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0043] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in a preferred implementation manner" that appears in different places in this specification does not all refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0044] Next, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be locally enlarged out of the general scale, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0045] Embodiment 1

[0046] Please refer to the attached Figures 1 to 10 As shown, it is the first embodiment of the present invention. This embodiment provides a hot water circulation pump, which includes a first motor 1, a coupling assembly 11, and a pump body 2. The coupling assembly 11 is installed between the first motor 1 and the pump body 2. A base 12 is installed at the bottom of the first motor 1. The first motor 1 is installed at one end of the base 12, and the pump body 2 is installed at the other end of the base 12;

[0047] On both sides inside the top of the pump body 2, a water inlet chamber 22 and a water outlet chamber 23 are respectively opened. Inside the pump body 2 and below the water outlet chamber 23, an impeller chamber 21 is opened;

[0048] A water inlet and outlet adjustment module 3. The water inlet and outlet adjustment module 3 is installed in the water inlet chamber 22 and the water outlet chamber 23. The water inlet and outlet adjustment module 3 includes two inlet and outlet adjustment discs 31. The two inlet and outlet adjustment discs 31 are respectively rotatably installed inside the water inlet chamber 22 and the water outlet chamber 23. A number of first water passing holes with different diameters are uniformly arranged on the outer side of the inlet and outlet adjustment disc 31;

[0049] An impeller adjustment module 4. The impeller adjustment module 4 is installed inside the impeller chamber 21. The impeller adjustment module 4 includes a back plate 41 and blades 42. One side of the back plate 41 is connected to the coupling assembly 11, and a number of synchronously rotatable blades 42 are uniformly installed on the other side of the back plate 41;

[0050] In the above, when in use, determine the rotational speed of the impeller during operation, and start the impeller adjustment module 4 according to the impeller rotational speed to change the angle of the blades 42, so that the impeller with the current blade 42 angle is more suitable for the current rotational speed, reducing the problem of vortex generation or increased resistance caused by the inability of the blades 42 to adapt to higher or lower rotational speeds due to the change in rotational speed. Changing the angle of the blades 42 while changing the rotational speed can adapt to the characteristics such as the fluid pressure and flow consumption changes due to the increase in rotational speed, thereby reducing phenomena such as vortex and backflow generation in the pump, thus reducing the generation of bubbles and achieving the effect of anti-cavitation. Moreover, the provided water inlet and outlet adjustment module 3 can precisely control the water flow, adjust the diameter of the corresponding water inlet and outlet according to the change in the rotational speed of the impeller, play a role in balancing the internal and external pressures, and reducing the inlet resistance, thereby reducing the generation of bubbles and reducing the cavitation risk.

[0051] In a preferred embodiment, please refer to Figure 2 andFigure 3 On both sides of the top of the pump body 2, a water inlet pipe 24 and a water outlet pipe 25 are respectively fixed. The water inlet pipe 24 is communicated with the water inlet cavity 22, and the water outlet pipe 25 is communicated with the water outlet cavity 23. A first channel 26 and a second channel 27 are also arranged inside the pump body 2. The water inlet cavity 22 is communicated with the impeller cavity 21 through the first channel 26, and the water outlet cavity 23 is communicated with the impeller cavity 21 through the second channel 27.

[0052] On one side of the inlet and outlet adjusting disc 31, a second water passing hole is opened. The second water passing holes on the two inlet and outlet adjusting discs 31 are respectively aligned with the water inlet pipe 24 and the water outlet pipe 25.

[0053] In the above, by starting the impeller to rotate, water flow can be sucked into the water inlet cavity 22 from the water inlet pipe 24, flow into the impeller cavity 21 through the first channel 26, then flow out of the water outlet cavity 23 from the second channel 27 and finally be pumped out from the water outlet pipe 25. Inside the water inlet cavity 22 and the water outlet cavity 23, an inlet and outlet adjusting disc 31 will be installed. During specific use, the rotation of the inlet and outlet adjusting disc 31 will be controlled according to the rotation speed of the impeller, and the diameter of the first water passing hole aligned with the first channel 26 and the second channel 27 will be changed, so as to achieve the function of controlling the water inlet and outlet flow rate and pressure.

[0054] Secondly, please refer to again Figure 4 、 Figure 5 and Figure 6 On one side of the middle of the inlet and outlet adjusting disc 31, a rotation adjusting part 32 is installed. On the inner side of the rotation adjusting part 32, ratchet teeth are provided. The directions of the ratchet teeth in the two rotation adjusting parts 32 are opposite. A rotating shaft 34 is rotatably connected between the two inlet and outlet adjusting discs 31. In the middle of the rotating shaft 34, a first bevel gear 35 is fixed. On the top of the pump body 2, a second motor 39 is fixed. On the output end of the second motor 39, a second bevel gear 36 is fixed. The second bevel gear 36 is meshed and connected with the first bevel gear 35;

[0055] On both ends of the rotating shaft 34, a rotating disc 37 is installed. On the outer side of the rotating disc 37, a ratchet pawl 38 is rotatably connected. The ratchet pawls 38 arranged on the two rotating discs 37 face in opposite directions. Below the ratchet pawl 38 and on the rotating disc 37, an elastic piece is installed.

[0056] In the above, specifically when controlling the rotation of the inlet and outlet adjustment disc 31, the second motor 39 installed above the pump body 2 drives the second bevel gear 36 to rotate. Under the meshing action, the second bevel gear 36 drives the first bevel gear 35 to rotate, thereby controlling the rotation of the rotating shaft 34. At the same time, the rotating discs 37 connected to both ends are driven to rotate together. When rotating, the pawls 38 connected to the rotating discs 37 are driven to move. Since the ratchet teeth on the two rotating adjustment members 32 are in opposite directions, the pawls 38 on the two rotating discs 37 face in opposite directions. When the rotating shaft 34 rotates to one side, only one side of the rotating adjustment member 32 will be pushed by the pawl 38 to rotate, and the other side will not. On the contrary, when the rotating shaft 34 rotates in the reverse direction, the rotating adjustment member 32 on the other side is pushed to rotate, thereby being able to control the rotation of the two inlet and outlet adjustment discs 31 to complete the switching of the first water through holes.

[0057] Embodiment 2

[0058] Please refer to the attached Figures 1 to 10 As shown, this is the second embodiment of the present invention. This embodiment provides a hot water circulation pump. One end of the blade 42 and inside the back plate 41 is fixed with a rotating shaft 43. The outside of the rotating shaft 43 is fixed with an extension rod 44. The middle part inside the back plate 41 is rotatably connected with a rotation driving member 46. A number of convex connecting blocks 47 are evenly arranged on the outside of the rotation driving member 46. A driving connecting rod 45 is installed between the convex connecting block 47 and the extension rod 44. Both ends of the driving connecting rod 45 are rotatably connected.

[0059] In the above, when it is necessary to control the angle deflection of the blade 42, by controlling the rotation of the rotation driving member 46, when the rotation driving member 46 rotates, it will drive the convex connecting blocks 47 connected to its outside to deflect. When the convex connecting blocks 47 deflect, they drive the driving connecting rod 45 to move together, and drive the extension rod 44 to swing along the rotating shaft 43, thereby driving the rotating shaft 43 and the blade 42 to generate an angle deflection, achieving the purpose of adjusting the angle of the blade 42.

[0060] Secondly, please refer to Figure 2 、 Figure 7 、 Figure 8 and Figure 9 At one end of the rotation driving member 46 and on one side of the back plate 41, an external driving block 48 is fixed. An adjustment groove is opened in the middle of the external driving block 48. A third motor 49 is installed inside the pump body 2. The output end of the third motor 49 is fixed with an electric push rod 50. The output end of the electric push rod 50 is fixed with an angle adjustment block 51. The angle adjustment block 51 has the same shape as the adjustment groove opened in the external driving block 48.

[0061] In the above, when it is necessary to drive the rotary drive member 46 to rotate, the electric push rod 50 installed in the pump body 2 is used to push the angle adjustment block 51 into the adjustment groove of the external drive block 48, and the third motor 49 is started to drive the electric push rod 50 and the angle adjustment block 51 to rotate together, while driving the external drive block 48 connected to the angle adjustment block 51 to rotate, so as to drive the rotary drive member 46 to rotate and drive the blade 42 to deflect in angle, completing the angle adjustment of the blade 42.

[0062] Next, please refer to Figure 2 and Figure 4 again. On both sides of the inlet and outlet adjustment disc 31, a rotating ring 33 is provided. The rotating ring 33 is located inside the water inlet chamber 22 and the water outlet chamber 23, and the rotating ring 33 is rotatably connected to the pump body 2.

[0063] In the above, the rotating ring 33 is used to provide friction, so that the inlet and outlet adjustment disc 31 can maintain its original state when it is not actively controlled to rotate, and will not move due to the influence of water flow.

[0064] Furthermore, a temperature detector, a pressure detector and an intelligent control module are arranged inside the pump body 2;

[0065] In the above, the temperature detector and the pressure detector arranged inside the pump body 2 are used to monitor the working state inside the pump body in real time, including water temperature and water pressure. The monitoring of these key parameters helps to detect abnormal situations in time, such as overheating or overpressure, so as to take preventive measures to avoid equipment damage and potential safety hazards. The intelligent control module can automatically adjust the operating parameters of the pump according to the real-time temperature and pressure data to ensure that the pump operates under the best working conditions. This adaptive adjustment not only improves the efficiency of the pump, but also extends the service life of the equipment.

[0066] Embodiment 3

[0067] This embodiment provides a control method for low-cavitation hot water circulation, which is used for a hot water circulation pump in Embodiment 1 and Embodiment 2, and is characterized in that it includes the following steps:

[0068] S1. Preparation before startup: Check whether the pump body 2 and the first motor 1 are firmly installed, and ensure that the base 12 is not loose. Confirm that the inlet pipe 24 and the outlet pipe 25 are correctly connected and there is no leakage. Check whether a small amount of sealing water is allowed to leak at the shaft seal, not exceeding 20 drops / minute to 25 drops / minute, and determine the impeller speed at startup;

[0069] S2. Adjust the inlet and outlet flow rates. According to the impeller speed, control the rotation of the two inlet and outlet adjustment discs 31 so that the first water passage holes with appropriate diameters are respectively connected to the first passage 26 and the second passage 27, to control the flow rate and pressure of the water inlet chamber 22 and the water outlet chamber 23, and ensure that the second water passage holes on the inlet and outlet adjustment discs are aligned with the water inlet pipe 24 and the water outlet pipe 25 to optimize the water flow path.

[0070] S3. Blade angle adjustment. Start the third motor 49, push the external drive block 48 through the electric push rod 50, so that the rotation drive member 46 inside the back plate 41 drives the blades 42 to rotate synchronously, and adjust the blade angle to optimize the hydrodynamic performance.

[0071] S4. Monitor temperature and pressure. Use the temperature detector and pressure detector inside the pump body 2 to monitor the temperature and pressure changes in the hot water circulation process in real time. According to the monitoring data, the intelligent control module automatically adjusts the working state of the motor to avoid the occurrence of cavitation.

[0072] S5. Shutdown operation. Before shutdown, gradually reduce the speed and power output of the hot water pump to avoid the water hammer effect caused by sudden shutdown, turn off the power supply, and disconnect the connection with the control system.

[0073] The working principle of the present invention is as follows: Before starting, conduct a comprehensive inspection of the device. After confirming that there is no error, adjust the inlet and outlet adjustment module 3 according to the speed of the impeller after startup. When adjusting the inlet and outlet adjustment module 3, drive the second bevel gear 36 to rotate through the second motor 39, and engage to drive the rotating shaft 34 to rotate forward or backward, respectively control the rotation of the two inlet and outlet adjustment discs 31 connected by a ratchet structure, adjust the appropriate first water passage holes and align them with the first passage 26 and the second passage 27 respectively. Then, according to the speed of the impeller, control the electric push rod 50 to push the angle adjustment block 51 so that the angle adjustment block 51 is inserted into the adjustment groove of the external drive block 48, drive the angle adjustment block 51 to rotate through the third motor 49, drive the rotation drive member 46 to rotate, and through transmission, cause the blades 42 to have an angular offset. Stop after adjusting the angle of the blades 42 to adapt to the impeller speed. Start the device, the impeller rotates, generates a vacuum, and pumps the liquid into the water inlet chamber 22. The adjusted inlet and outlet adjustment module 3 can accurately control the water flow, adjust the diameter of the corresponding inlet and outlet according to the change of the impeller speed, play a role in balancing the internal and external pressures and reducing the inlet resistance, thereby reducing the generation of bubbles and the risk of cavitation. At the same time, the adjusted blades 42 are more suitable for the current speed, reducing the problem of vortex generation or increased resistance caused by the blades 42 being unable to adapt to higher or lower speeds due to the change of speed. Changing the angle of the blades 42 while changing the speed can adapt to the characteristics of fluid pressure and flow consumption changed due to the increase of speed, thereby reducing the generation of vortices and backflows in the pump, and thus reducing the generation of bubbles and achieving the effect of anti-cavitation.

[0074] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention are implemented according to the conventional means in the art without special description and limitation.

Claims

1. A hot water circulation pump, characterized in that: It comprises a first motor (1), a coupling assembly (11) and a pump body (2), wherein the coupling assembly (11) is installed between the first motor (1) and the pump body (2); A water inlet chamber (22) and a water outlet chamber (23) are respectively provided on two sides of the top of the pump body (2), and an impeller chamber (21) is provided inside the pump body (2) and below the water outlet chamber (23); An inlet and outlet water regulating module (3), the inlet and outlet water regulating module (3) being installed in the water inlet chamber (22) and the water outlet chamber (23), the inlet and outlet water regulating module (3) comprising two inlet and outlet regulating disks (31), the two inlet and outlet regulating disks (31) being rotatably installed in the water inlet chamber (22) and the water outlet chamber (23), respectively, and a plurality of first water holes of different diameters being evenly arranged on the outer sides of the inlet and outlet regulating disks (31); An impeller adjustment module (4), the impeller adjustment module (4) being installed inside the impeller cavity (21), the impeller adjustment module (4) comprising a back plate (41) and blades (42), one side of the back plate (41) being connected to the coupling assembly (11), and the other side of the back plate (41) being evenly mounted with a plurality of blades (42) that can rotate synchronously; A rotary adjusting member (32) is installed on one side of the middle of the inlet and outlet adjusting disk (31), a ratchet is provided on the inner side of the rotary adjusting member (32), and the ratchet teeth in the two rotary adjusting members (32) are arranged in opposite directions. A rotating shaft (34) is rotatably connected between the two inlet and outlet adjusting disks (31), a first bevel gear (35) is fixed to the middle of the rotating shaft (34), a second motor (39) is fixed to the top of the pump body (2), a second bevel gear (36) is fixed to the output end of the second motor (39), and the second bevel gear (36) is meshingly connected with the first bevel gear (35); Rotating disks (37) are mounted on both ends of the rotating shaft (34); ratchets (38) are rotatably connected to the outer sides of the rotating disks (37); the ratchets (38) arranged on the two rotating disks (37) face in opposite directions; and an elastic sheet is mounted below the ratchets (38) and on the rotating disks (37).

2. A hot water circulation pump according to claim 1, characterized in that: A water inlet pipe (24) and a water outlet pipe (25) are respectively fixed to both sides of the top of the pump body (2); the water inlet pipe (24) is in communication with the water inlet chamber (22); the water outlet pipe (25) is in communication with the water outlet chamber (23); a first channel (26) and a second channel (27) are further provided inside the pump body (2); the water inlet chamber (22) is in communication with the impeller chamber (21) via the first channel (26); the water outlet chamber (23) is in communication with the impeller chamber (21) via the second channel (27).

3. A hot water circulation pump according to claim 2, characterized in that: A second water through hole is provided on one side of the inlet and outlet regulating disk (31), and the second water through holes on the two inlet and outlet regulating disks (31) are aligned with the water inlet pipe (24) and the water outlet pipe (25), respectively.

4. A hot water circulation pump according to claim 1, characterized in that: A rotating shaft (43) is fixed at one end of the blade (42) and is located inside the back plate (41); an extension rod (44) is fixed outside the rotating shaft (43); a rotating driving member (46) is rotatably connected to the middle of the back plate (41); a plurality of protruding connecting blocks (47) are evenly arranged on the outside of the rotating driving member (46); a driving connecting rod (45) is installed between the protruding connecting block (47) and the extension rod (44); and both ends of the driving connecting rod (45) are rotatably connected.

5. A hot water circulation pump according to claim 4, characterized in that: An external drive block (48) is fixed at one end of the rotary drive member (46) and located on one side of the back plate (41); an adjustment slot is provided in the middle of the external drive block (48); a third motor (49) is installed inside the pump body (2); an electric push rod (50) is fixed at the output end of the third motor (49); an angle adjustment block (51) is fixed at the output end of the electric push rod (50); the angle adjustment block (51) has the same shape as the adjustment slot provided in the external drive block (48).

6. A hot water circulation pump according to claim 1, characterized in that: Rotating rings (33) are provided on the outer sides of both sides of the inlet and outlet adjustment disks (31); the rotating rings (33) are located inside the water inlet chamber (22) and the water outlet chamber (23); and the rotating rings (33) are rotatably connected to the pump body (2).

7. A hot water circulation pump according to claim 1, characterized in that: A temperature detector, a pressure detector and an intelligent control module are arranged inside the pump body (2).

8. A hot water circulation pump according to claim 1, characterized in that: A base (12) is installed at the bottom of the first motor (1); the first motor (1) is installed at one end of the base (12), and the pump body (2) is installed at the other end of the base (12).

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