Vertical self-priming centrifugal pump

Abstract

This invention discloses a vertical self-priming centrifugal pump, comprising a pump casing, an impeller, a disc drive assembly, and a cooling flow path. The pump casing contains a pump chamber and a cooling chamber, and is equipped with an inlet and an outlet communicating with the pump chamber. The impeller is disposed within the pump chamber and is used to drive the liquid to be pumped to flow from the inlet to the outlet. The disc drive assembly includes a stator and a rotor. The rotor is connected to the impeller and can rotate synchronously with the impeller. The stator is fixedly disposed within the cooling chamber and is arranged axially opposite to the rotor. The cooling flow path connects the pump chamber and the cooling chamber, and is used to allow the liquid to be pumped to flow through the area where the stator is located. This invention aims to solve the technical problems of low integration between the drive and the pump body and insufficient compactness of the overall machine in existing vertical centrifugal pumps.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, and more specifically to a vertical self-priming centrifugal pump. Background Technology

[0002] Centrifugal pumps are fluid transport devices that rely on the rotation of an impeller to perform work on a liquid. They convert mechanical energy into the pressure and kinetic energy of the liquid and are widely used in industrial circulating water, agricultural irrigation, urban water supply and drainage, ship drainage, and equipment cooling. Vertical self-priming centrifugal pumps typically have advantages such as a relatively small footprint, good adaptability to installation direction, and the ability to automatically prime water to a certain extent after startup. Therefore, they are suitable for liquid transport applications in ships, factories, pumping stations, or other locations with relatively limited installation space.

[0003] Existing vertical self-priming centrifugal pumps typically use an external motor as the power source. The motor is connected to the impeller inside the pump body via a shaft, coupling, or other transmission connection structure to drive the impeller to rotate within the pump chamber and complete the liquid suction and discharge. While this structure can meet basic conveying requirements, the motor and pump body are usually relatively independent components. A transmission shaft system, connecting seat, sealing structure, and corresponding mounting support structure are also required between them, creating additional structural overlap in the height or axial direction of the entire unit. Especially in vertical layouts, the external motor and transmission connection components occupy space above or to the side of the pump body, resulting in a relatively dispersed structure and a still significant installation space requirement, making it difficult to further adapt to the needs of miniaturization and integration.

[0004] Therefore, existing vertical self-priming centrifugal pumps still suffer from low integration between the drive structure and the pump body structure, making it difficult to achieve a compact overall layout. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a vertical self-priming centrifugal pump to solve the technical problems of low integration between the drive and the pump body and insufficient compactness of the whole machine in the existing vertical centrifugal pump.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides a vertical self-priming centrifugal pump, comprising: a pump casing having a pump chamber and a cooling chamber inside, and an inlet and an outlet communicating with the pump chamber; an impeller disposed within the pump chamber for driving the liquid to be pumped to flow from the inlet to the outlet; a disc drive assembly including a stator and a rotor, the rotor being connected to the impeller and capable of rotating synchronously with the impeller, the stator being fixedly disposed within the cooling chamber and arranged axially opposite to the rotor; and a cooling flow path connecting the pump chamber and the cooling chamber for allowing the liquid to be pumped to flow through the area where the stator is located.

[0007] In some embodiments, the rotor is disposed on the side of the impeller facing the cooling chamber, and the stator is disposed on the side of the cooling chamber facing the pump chamber, with an axial air gap formed between the stator and the rotor.

[0008] In some embodiments, the rotor is a disc rotor, which is fixed to the end face of the impeller and coaxially arranged with the impeller.

[0009] In some embodiments, the cooling chamber is provided with a water inlet and a return outlet. The water inlet is connected to the pump chamber through a cooling flow path so that the liquid to be pumped in the pump chamber enters the cooling chamber through the cooling flow path. The return outlet connects the cooling chamber and the pump chamber so that the liquid to be pumped in the cooling chamber flows back to the pump chamber.

[0010] In some embodiments, the outer surface of the stator and / or rotor is covered with an insulating layer for isolating the stator and / or rotor from the liquid to be pumped.

[0011] In some embodiments, the insulating layer is a polyimide separator.

[0012] In some embodiments, the pump chamber includes a first pump chamber and a second pump chamber that are sequentially connected along the flow direction of the liquid to be pumped, and the impeller includes a first impeller disposed in the first pump chamber and a second impeller disposed in the second pump chamber.

[0013] In some embodiments, the disc drive assembly includes a first disc drive assembly and a second disc drive assembly, wherein the rotor of the first disc drive assembly is connected to a first impeller, and the rotor of the second disc drive assembly is connected to a second impeller.

[0014] In some embodiments, the cooling chamber includes a first cooling chamber and a second cooling chamber, the first cooling chamber being configured corresponding to a first disc drive assembly, the second cooling chamber being configured corresponding to a second disc drive assembly, and the first cooling chamber and the second cooling chamber being respectively connected to a cooling flow path.

[0015] In some embodiments, the pump casing is formed with a curved cavity connecting the water inlet and the pump chamber, and a horizontal flow channel is provided between the water inlet and the curved cavity, with a protrusion provided in the horizontal flow channel.

[0016] Compared with existing technologies, the vertical centrifugal pump provided by this invention integrates the disc drive assembly between the pump casing and the impeller, allowing the rotor to be directly connected to the impeller and rotate synchronously with it. The stator is fixedly located within the cooling chamber inside the pump casing and arranged axially opposite to the rotor. This eliminates the need for external transmission components such as an external motor, a long drive shaft, and couplings, shortening the power transmission path and improving the integration of the drive structure and pump body structure, resulting in a more compact overall structure for the vertical self-priming centrifugal pump. Furthermore, this application connects the pump chamber and the cooling chamber through a cooling flow path, allowing the liquid to be pumped within the pump chamber to flow as a cooling medium through the stator area, thereby removing the heat generated by the disc drive assembly. This ensures reliable heat dissipation while achieving internal integration of the drive assembly, which is beneficial for improving the long-term operational stability of the centrifugal pump. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of a vertical self-priming centrifugal pump provided in an embodiment of the present invention; Figure 2 This is a top view of a vertical self-priming centrifugal pump provided in an embodiment of the present invention; Figure 3 This is provided by the embodiments of the present invention. Figure 2 A cross-sectional view along the AA direction.

[0018] Explanation of reference numerals in the attached figures: 10. Pump casing; 11. Pump chamber; 111. First pump chamber; 112. Second pump chamber; 12. Cooling chamber; 121. Water inlet; 122. Return hole; 123. First cooling chamber; 124. Second cooling chamber; 13. Water inlet; 14. Water outlet; 15. Bending chamber; 16. Horizontal flow channel; 17. Protrusion; 20. Impeller; 21. First impeller; 22. Second impeller; 30. Disc drive assembly; 31. Stator; 32. Rotor; 33. Axial air gap; 34. First disc drive assembly; 35. Second disc drive assembly; 40. Cooling flow path. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] To address the technical problems of low integration between the drive and pump body, and insufficient overall compactness in existing vertical centrifugal pumps, this invention provides a vertical self-priming centrifugal pump that improves the integration between the drive structure and the pump body structure, resulting in a more compact overall structure.

[0021] It should be noted that the vertical self-priming centrifugal pump described in this invention is used in, but not limited to, the field of centrifugal pumps. For ease of explanation, this invention will only use the application of the vertical self-priming centrifugal pump in centrifugal pump equipment as an example. The principle of the vertical self-priming centrifugal pump in other types of equipment is essentially the same as that in centrifugal pump equipment, and will not be described in detail here.

[0022] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of a vertical self-priming centrifugal pump according to one embodiment of the present invention. Figure 2 This is a top view of a vertical self-priming centrifugal pump provided in an embodiment of the present invention. Figure 3 This is provided by the embodiments of the present invention. Figure 2 A cross-sectional view along the AA direction. This vertical self-priming centrifugal pump can be applied to industrial circulating water, ship drainage, equipment cooling, agricultural irrigation, or other scenarios requiring liquid pumping, and is especially suitable for applications with limited installation space and high requirements for equipment integration. By integrating the drive structure with the pump body structure, this vertical self-priming centrifugal pump reduces the installation space occupied by traditional external motors and transmission connection components, thus improving the overall compactness of the machine.

[0023] The vertical self-priming centrifugal pump in this embodiment includes a pump casing 10, an impeller 20, a disc drive assembly 30, and a cooling flow path 40. The pump casing 10 serves as the main supporting structure of the centrifugal pump, forming the flow space for the liquid to be pumped and the installation space for the drive assembly. Inside the pump casing 10, there is a pump chamber 11 and a cooling chamber 12. The pump chamber 11 houses the impeller 20 and provides flow space for the liquid to be pumped. The cooling chamber 12 houses the stator 31 in the disc drive assembly 30 and provides flow space for heat dissipation from the stator 31. The pump casing 10 also has an inlet 13 and an outlet 14 communicating with the pump chamber 11. The inlet 13 allows the liquid to be pumped to enter the pump chamber 11, and the outlet 14 discharges the liquid pressurized by the impeller 20 from the pump casing 10.

[0024] The impeller 20 is disposed within the pump chamber 11 and is rotatable relative to the pump casing 10. During assembly, the impeller 20 can be rotatably supported within the pump chamber 11 via a rotating shaft, bearing assembly, or a positioning mounting portion formed within the pump casing 10, ensuring that the rotation axis of the impeller 20 is aligned with or substantially aligned with the central axis of the pump chamber 11. A rotational clearance can be reserved between the impeller 20 and the pump casing 10 to prevent interference between the impeller 20 and the pump casing 10 during rotation. Simultaneously, the axial position of the impeller 20 can be positioned via an end cover, a limiting step, a bearing seat, or other limiting structures to ensure stable rotation of the impeller 20 within the pump chamber 11. When the impeller 20 rotates, the liquid to be pumped into the pump chamber 11 gains kinetic and pressure energy under the drive of the impeller 20 and flows from the inlet 13 side towards the outlet 14 side, thereby achieving the suction and discharge of the liquid. The impeller 20 can cooperate with the flow channel inside the pump casing 10 to form a stable flow path for the liquid to be pumped in the pump chamber 11, so as to ensure the basic conveying capacity of the centrifugal pump.

[0025] The disc drive assembly 30 provides rotational power to the impeller 20. The disc drive assembly 30 includes a stator 31 and a rotor 32. The rotor 32 is connected to the impeller 20 and can rotate synchronously with it. The stator 31 is fixedly disposed within the cooling chamber 12 and is axially opposite to the rotor 32. Through this arrangement, when the stator 31 is energized, it can generate electromagnetic coupling with the rotor 32, causing the rotor 32 to directly drive the impeller 20 to rotate relative to the pump casing 10. This eliminates the need for a separate motor outside the pump casing 10 and eliminates the need for long drive shafts, couplings, or other structures to transmit external power to the impeller 20, thereby reducing the number of external connecting parts between the drive structure and the pump body, making the overall structure of the vertical self-priming centrifugal pump more compact.

[0026] Cooling flow path 40 connects pump chamber 11 and cooling chamber 12, allowing the liquid to be pumped to flow through the area where stator 31 is located. Since stator 31 is located within cooling chamber 12, the liquid flowing through cooling chamber 12 can carry away the heat generated by stator 31 during operation, thereby improving the heat dissipation conditions of disc drive assembly 30. By combining the installation space of stator 31 with the flow space of the liquid to be pumped, the integration of the drive assembly can be improved while avoiding a decrease in heat dissipation conditions due to the drive assembly being built-in, thus helping to ensure the long-term operational stability of disc drive assembly 30.

[0027] In this embodiment, by connecting the rotor 32 to the impeller 20 and fixing the stator 31 inside the cooling chamber 12 of the pump casing 10, and arranging the stator 31 and rotor 32 axially opposite each other, the integration of the disc drive assembly 30 with the pump body structure and the impeller 20 structure is achieved. Compared with traditional vertical centrifugal pumps driven by external motors, this embodiment can reduce the space occupied by the external motor and transmission connection structure, improve the integration of the drive structure and the pump body structure, and make the overall structure of the vertical self-priming centrifugal pump more compact; at the same time, the cooling flow path 40 can cool the area where the stator 31 is located, which helps to ensure the operational reliability of the integrated drive structure.

[0028] In one embodiment, the impeller 20 is disposed in the pump chamber 11, the cooling chamber 12 is arranged adjacent to the pump chamber 11 in the axial direction, the rotor 32 is fixed on the end face of the impeller 20 near the cooling chamber 12, and the stator 31 is fixedly installed on the side wall or mounting part of the cooling chamber 12 near the pump chamber 11, and is arranged opposite to the rotor 32 in the axial direction, so that the axial action gap required for the disc drive structure is formed between the stator 31 and the rotor 32.

[0029] By providing an axial air gap 33 between the stator 31 and the rotor 32, mechanical friction or collision between the rotor 32 and the stator 31 can be avoided when the impeller 20 rotates at high speed, thus reducing the risk of wear on the stator 31, rotor 32 and impeller 20. On the other hand, the axial air gap 33 can provide a stable working space for the electromagnetic interaction between the stator 31 and the rotor 32, so that the magnetic field generated by the stator 31 can act on the rotor 32 axially, thereby ensuring the driving stability of the disc drive assembly 30 on the impeller 20.

[0030] Furthermore, the axial air gap 33 can also accommodate assembly errors or slight axial movement of the impeller 20 during rotation. When the impeller 20 undergoes a slight positional change due to pressure fluctuations, manufacturing errors, or installation deviations of the liquid to be pumped, the stator 31 and rotor 32 can still maintain a spaced fit through the axial air gap 33, reducing the risk of interference between the stator and rotor 32 due to insufficient clearance.

[0031] Furthermore, since the stator 31 and rotor 32 are arranged axially relative to each other, the size of the axial air gap 33 can be set according to the requirements of drive efficiency, assembly accuracy, and operational stability. If the axial air gap 33 is too small, it may increase the risk of interference between the stator 31 and rotor 32; if the axial air gap 33 is too large, it may weaken the electromagnetic interaction between the stator 31 and rotor 32. Therefore, in practical design, the axial air gap 33 can be kept within a preset range by controlling the positional accuracy of the mounting surface of the stator 31, the mounting surface of the rotor 32, and the axial positioning structure of the impeller 20, so as to balance drive efficiency and operational safety.

[0032] Furthermore, the rotor 32 is a disc-shaped rotor 32, and the impeller 20 has an end face facing the cooling chamber 12. The disc-shaped rotor 32 is fitted or embedded on this end face, and the central axis of the disc-shaped rotor 32 coincides with the rotation axis of the impeller 20. The disc-shaped rotor 32 can be fixed to the end face of the impeller 20 by means of embedding, bonding, pressing, fastening, or integral molding, as long as it can ensure that the disc-shaped rotor 32 rotates synchronously with the impeller 20 during the rotation of the impeller 20. After the impeller 20 is rotatably assembled in the pump chamber 11, the disc-shaped rotor 32 can rotate with the impeller 20 as a whole, so that the mechanical assembly structure of the impeller 20 and the power input structure of the disc drive assembly 30 cooperate with each other.

[0033] In this embodiment, by setting the rotor 32 as a disc-shaped structure, the rotor 32 and the stator 31 can form a larger relative interaction area along the axial direction, thereby adapting to the axial coupling form of the disc drive assembly 30. Compared with the cylindrical or bushing-type rotor 32, the disc-shaped rotor 32 is easier to arrange at the end face of the impeller 20, without requiring a large additional radial installation space, and without the need for a complex rotor 32 support structure on the outside of the impeller 20, which is beneficial to improving the integration between the rotor 32 and the impeller 20. At the same time, the disc-shaped rotor 32 is coaxially arranged with the impeller 20, so that the rotational torque generated by the rotor 32 can be transmitted to the impeller 20 around the rotation axis of the impeller 20, avoiding the impeller 20 rotational imbalance caused by the eccentric installation of the rotor 32. Thus, the risk of vibration and uneven wear during the rotation of the impeller 20 can be reduced, and the smoothness of the impeller 20 operation can be improved.

[0034] In one embodiment, the cooling chamber 12 is provided with a water inlet 121 and a return outlet 122. One end of the cooling flow path 40 is connected to the pump chamber 11, and the other end is connected to the cooling chamber 12 through the water inlet 121. When the centrifugal pump is running, the liquid to be pumped in the pump chamber 11 forms a flow pressure under the action of the impeller 20. A portion of the liquid to be pumped can enter the cooling flow path 40 and flow into the cooling chamber 12 through the water inlet 121. Since the stator 31 is fixedly installed in the cooling chamber 12, the liquid to be pumped into the cooling chamber 12 can flow through the area where the stator 31 is located, thereby carrying away the heat generated by the stator 31 during operation.

[0035] A return flow hole 122 is located between the cooling chamber 12 and the pump chamber 11 to guide the liquid to be pumped back to the pump chamber 11 after flowing through the area where the stator 31 is located. An internal circulation path is formed between the pump chamber 11, the cooling flow path 40, the water inlet 121, the cooling chamber 12, and the return flow hole 122, allowing the liquid to be pumped within the pump chamber 11 to participate in the heat dissipation process of the stator 31 as a cooling medium. This structure eliminates the need for an additional independent cooling water source or air-cooled heat dissipation components, enabling the centrifugal pump itself to transport the liquid to be pumped to cool the disc drive assembly 30.

[0036] In this embodiment, on the one hand, the cooling chamber 12 can provide the stator 31 with a relatively independent installation and heat dissipation space, avoiding the stator 31 being directly exposed to the main channel of the pump chamber 11 and affecting the normal delivery of the impeller 20; on the other hand, the liquid to be pumped enters the cooling chamber 12 through the cooling flow path 40 and then returns to the pump chamber 11 through the return hole 122, which can ensure that the liquid to be pumped in the cooling chamber 12 is continuously renewed, reducing the risk of heat accumulation around the stator 31, thereby improving the operational stability of the disc drive assembly 30.

[0037] In one embodiment, since the stator 31 is disposed within the cooling chamber 12, the liquid to be pumped will pass through the area where the stator 31 is located when flowing within the cooling chamber 12. Simultaneously, the rotor 32 is connected to the impeller 20 and arranged close to the pump chamber 11 or the cooling chamber 12; the rotor 32 may also be in a liquid or humid environment. By providing an insulating layer on the outer surface of the stator 31 and / or the rotor 32, an isolation barrier can be formed between the electrical components and the liquid medium to be pumped, reducing the risk of the liquid entering the stator 31 windings, the rotor 32 magnets, or conductive connection areas.

[0038] The insulating layer can cover the outer surface of the stator 31 windings, the outer surface of the core, and the side surface near the flow area of ​​the liquid to be pumped out. It can also cover the outer peripheral surface, end face, or side surface near the axial air gap 33 of the rotor 32. The coverage area of ​​the insulating layer can be set according to the contact position between the stator 31, rotor 32 and the liquid to be pumped out, as long as it can effectively cover the areas of the stator 31 and / or rotor 32 that require waterproofing, moisture-proofing, or insulation protection.

[0039] In this embodiment, by setting an insulating isolation layer, on the one hand, the risk of short circuits, leakage or corrosion caused by direct contact between the liquid to be pumped and the stator 31 and rotor 32 can be reduced, thereby improving the electrical safety of the disc drive assembly 30 when it is running inside the pump body; on the other hand, the insulating isolation layer can form surface protection for the stator 31 and / or rotor 32, reducing the adverse effects of the liquid to be pumped, impurity adhesion or media corrosion on the drive assembly, thereby improving the long-term operational reliability of the disc drive assembly 30.

[0040] Furthermore, the insulating layer is a polyimide layer. Polyimide material has good electrical insulation properties, heat resistance, and corrosion resistance, making it suitable for surface protection of electrical components such as the motor stator 31 and rotor 32. After covering the outer surface of the stator 31 and / or rotor 32 with the polyimide layer, stable insulation protection can be provided for the stator 31 and / or rotor 32 without significantly increasing the volume of the drive assembly.

[0041] Furthermore, the polyimide separator can be formed on the outer surface of the stator 31 and / or rotor 32 by means of coating, wrapping, pasting, impregnation and curing, or composite molding. By controlling the thickness and coverage area of ​​the polyimide separator, the impact on the axial air gap 33 between the stator 31 and rotor 32 and the electromagnetic coupling effect can be reduced while ensuring the insulation effect.

[0042] In one embodiment, the pump chamber 11 includes a first pump chamber 111 and a second pump chamber 112 connected sequentially along the flow direction of the liquid to be pumped. The impeller 20 includes a first impeller 21 disposed in the first pump chamber 111 and a second impeller 22 disposed in the second pump chamber 112. The first pump chamber 111 is connected to the inlet 13, and the second pump chamber 112 is connected to the outlet 14. An intermediate flow channel is formed between the first pump chamber 111 and the second pump chamber 112 so that the liquid to be pumped entering the first pump chamber 111 can enter the second pump chamber 112 through the intermediate flow channel after the first impeller 21 is activated, and be discharged from the outlet 14 after the second impeller 22 is activated. The first impeller 21 is mainly used to draw the liquid to be pumped from the lower part of the pump casing 10 or the side of the inlet 13, and to pressurize the liquid to be pumped and then discharge it to the second pump chamber 112; the second impeller 22 is mainly used to draw the liquid to be pumped from the first pump chamber 111 into the second pump chamber 112, and to pressurize the liquid to be pumped again and then discharge it through the outlet 14.

[0043] The first impeller 21 is disposed within the first pump chamber 111 and can be rotatably mounted within the first pump chamber 111 via a first rotating shaft, a first bearing assembly, or a first positioning mounting part. It is used to initially pressurize and guide the liquid to be pumped into the inlet 13. When the first impeller 21 rotates, the liquid to be pumped gains initial kinetic and pressure energy under the action of the first impeller 21 and flows towards the outlet area of ​​the first pump chamber 111. The second impeller 22 is disposed within the second pump chamber 112 and can be rotatably mounted within the second pump chamber 112 via a second rotating shaft, a second bearing assembly, or a second positioning mounting part. It is used to receive the liquid to be pumped output from the first pump chamber 111 and further pressurize the liquid, so that the liquid to be pumped has a higher output pressure after flowing through the second pump chamber 112.

[0044] In this embodiment, by configuring the pump chamber 11 as a first pump chamber 111 and a second pump chamber 112 connected sequentially along the flow direction of the liquid to be pumped, and by configuring a first impeller 21 and a second impeller 22 in the two pump chambers 11 respectively, a multi-stage pressurization structure can be formed. Compared with a structure that only has a single impeller 20, this configuration can distribute the pressurization process of the liquid to be pumped to be completed in multiple impellers 20. That is, the first impeller 21 completes the suction and primary discharge of the lower liquid, and then the second impeller 22 completes the secondary suction and discharge of the liquid output from the first pump chamber 111. This allows the liquid to be pumped to gain energy step by step in different pump chambers 11, which is beneficial to improving the head and discharge capacity of the vertical self-priming centrifugal pump.

[0045] Furthermore, the first pump chamber 111 and the second pump chamber 112 are connected in sequence, allowing the liquid to be pumped to flow continuously along a preset flow path, reducing disordered backflow or local disturbance of the liquid inside the pump body. The first impeller 21 and the second impeller 22 are respectively disposed in the corresponding pump chamber 11, which also facilitates the matching design of the impeller 20 size, blade shape or installation position according to the flow rate and pressure requirements of different pump chambers 11, thereby improving the stability of the liquid transportation process.

[0046] Furthermore, the disc drive assembly 30 includes a first disc drive assembly 34 and a second disc drive assembly 35. The first disc drive assembly 34 is disposed corresponding to the first pump chamber 111 and is used to drive the first impeller 21 to rotate relative to the pump casing 10. The second disc drive assembly 35 is disposed corresponding to the second pump chamber 112 and is used to drive the second impeller 22 to rotate relative to the pump casing 10. Both the first disc drive assembly 34 and the second disc drive assembly 35 may include a stator 31 and a rotor 32 arranged axially opposite to each other. The rotor 32 of the first disc drive assembly 34 is fixed to the end face of the first impeller 21 and can rotate synchronously with the first impeller 21. The rotor 32 of the second disc drive assembly 35 is fixed to the end face of the second impeller 22 and can rotate synchronously with the second impeller 22.

[0047] During assembly, the rotor 32 of the first disc drive assembly 34 can be attached to or embedded in the end face of the first impeller 21 facing the corresponding cooling chamber 12, and the rotor 32 of the second disc drive assembly 35 can be attached to or embedded in the end face of the second impeller 22 facing the corresponding cooling chamber 12, so that the first impeller 21 and its corresponding rotor 32 are coaxially fixed, and the second impeller 22 and its corresponding rotor 32 are coaxially fixed. Thus, the first disc drive assembly 34 can directly drive the first impeller 21 to draw in the lower liquid and discharge it to the second pump chamber 112, and the second disc drive assembly 35 can directly drive the second impeller 22 to draw in the liquid output from the first pump chamber 111 and discharge it through the outlet 14.

[0048] The first disc drive assembly 34 and the second disc drive assembly 35 can be parameter-matched according to the load requirements of the first impeller 21 and the second impeller 22. For example, the stator 31 winding parameters, rotor 32 magnet dimensions, or output torque of the first disc drive assembly 34 and the second disc drive assembly 35 can be set the same, or they can be set differently according to the flow rate, pressure, or speed requirements of different stages of impeller 20. This can improve the drive adaptability of each stage of impeller 20, enabling the liquid to be pumped to achieve more stable stepwise pressurization in the first pump chamber 111 and the second pump chamber 112.

[0049] Meanwhile, the first disc drive assembly 34 and the second disc drive assembly 35 are respectively arranged close to the corresponding first impeller 21 and second impeller 22, so that the driving force can be directly input at the location of each stage impeller 20. In this way, each stage impeller 20 does not need to rely on a long drive shaft that runs through multiple pump chambers 11 for power transmission, which helps to simplify the internal structure of the pump body and reduce the impact of the transmission components on the arrangement of the flow channels of the liquid to be pumped, thereby facilitating the formation of a multi-stage pressurization structure in a limited space.

[0050] In this embodiment, by integrating the first disc drive assembly 34 with the first impeller 21 and the second disc drive assembly 35 with the second impeller 22, the multi-stage impeller 20 structure and the disc drive structure form a hierarchical correspondence, which improves the pumping capacity of the liquid to be pumped and further enhances the structural compactness and drive integration of the vertical self-priming centrifugal pump.

[0051] In one embodiment, the cooling chamber 12 includes a first cooling chamber 123 and a second cooling chamber 124. The first cooling chamber 123 may be disposed on the side near the stator 31 of the first disc drive assembly 34 for accommodating or at least partially surrounding the stator 31 of the first disc drive assembly 34. The second cooling chamber 124 may be disposed on the side near the stator 31 of the second disc drive assembly 35 for accommodating or at least partially surrounding the stator 31 of the second disc drive assembly 35.

[0052] Cooling flow path 40 can be connected to the first cooling chamber 123 and the second cooling chamber 124 respectively, so that the liquid to be pumped in the pump chamber 11 can enter the first cooling chamber 123 and the second cooling chamber 124 respectively. When the liquid to be pumped flows through the first cooling chamber 123, it can carry away the heat generated during the operation of the first disc drive assembly 34; when the liquid to be pumped flows through the second cooling chamber 124, it can carry away the heat generated during the operation of the second disc drive assembly 35.

[0053] In this embodiment, by correspondingly arranging the first cooling chamber 123 with the first disc drive assembly 34 and the second cooling chamber 124 with the second disc drive assembly 35, a partitioned correspondence can be formed between the cooling structure and the multi-stage drive structure. Compared to a structure with only one centralized cooling space, this arrangement allows the liquid to be pumped to flow more specifically through the areas where each level of the disc drive assembly 30 is located, reducing heat concentration and mutual influence between different drive assemblies, thereby improving the heat dissipation uniformity of the multi-stage disc drive structure.

[0054] In one embodiment, the pump housing 10 is formed with a curved cavity 15 connecting the water inlet 13 and the pump chamber 11, and a horizontal flow channel 16 is provided between the water inlet 13 and the curved cavity 15, and a protrusion 17 is provided in the horizontal flow channel 16.

[0055] The inlet 13 receives the liquid to be pumped. The curved cavity 15 is located between the inlet 13 and the pump chamber 11, guiding the liquid entering from the inlet 13 into the pump chamber 11. The horizontal flow channel 16 connects the inlet 13 and the curved cavity 15, allowing the liquid to pass through a relatively gentle flow area before entering the curved cavity 15. The protrusion 17 is provided within the horizontal flow channel 16 and can protrude towards the interior space of the horizontal flow channel 16, so that the horizontal flow channel 16 forms a local flow channel variation area at the location of the protrusion 17.

[0056] In this embodiment, by providing a horizontal flow channel 16 between the inlet 13 and the bending cavity 15, the liquid to be pumped can have a relatively stable flow path before entering the bending cavity 15, reducing local turbulence or impact when the liquid to be pumped directly enters the bending cavity 15. Furthermore, by providing a protrusion 17 in the horizontal flow channel 16, the local flow area of ​​the horizontal flow channel 16 can be changed, thereby pre-adjusting the flow state of the liquid to be pumped before entering the bending cavity 15, which is beneficial to improving the flow stability of the liquid to be pumped before entering the pump chamber 11.

[0057] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A vertical self-priming centrifugal pump, characterized in that, include: The pump casing has a pump chamber and a cooling chamber inside, and is provided with an inlet and an outlet that communicate with the pump chamber; An impeller, disposed within the pump chamber, is used to drive the liquid to be pumped to flow from the inlet to the outlet. A disc drive assembly includes a stator and a rotor, wherein the rotor is connected to the impeller and can rotate synchronously with the impeller, and the stator is fixedly disposed in the cooling chamber and arranged axially opposite to the rotor; A cooling flow path connects the pump chamber and the cooling chamber, allowing the liquid to be pumped to flow through the area where the stator is located.

2. The vertical self-priming centrifugal pump according to claim 1, characterized in that, The rotor is disposed on the side of the impeller facing the cooling chamber, and the stator is disposed on the side of the cooling chamber facing the pump chamber, with an axial air gap formed between the stator and the rotor.

3. The vertical self-priming centrifugal pump according to claim 2, characterized in that, The rotor is a disc-shaped rotor, which is fixed to the end face of the impeller and is coaxially arranged with the impeller.

4. The vertical self-priming centrifugal pump according to claim 1, characterized in that, The cooling chamber is provided with a water inlet and a return outlet. The water inlet is connected to the pump chamber through the cooling flow path so that the liquid to be pumped in the pump chamber enters the cooling chamber through the cooling flow path. The return outlet connects the cooling chamber and the pump chamber so that the liquid to be pumped in the cooling chamber flows back to the pump chamber.

5. The vertical self-priming centrifugal pump according to claim 1, characterized in that, The outer surface of the stator and / or the rotor is covered with an insulating layer for isolating the stator and / or the rotor from the liquid to be pumped out.

6. The vertical self-priming centrifugal pump according to claim 5, characterized in that, The insulating layer is a polyimide separator.

7. The vertical self-priming centrifugal pump according to any one of claims 1 to 6, characterized in that, The pump chamber includes a first pump chamber and a second pump chamber that are sequentially connected along the flow direction of the liquid to be pumped, and the impeller includes a first impeller disposed in the first pump chamber and a second impeller disposed in the second pump chamber.

8. The vertical self-priming centrifugal pump according to claim 7, characterized in that, The disc drive assembly includes a first disc drive assembly and a second disc drive assembly, wherein the rotor of the first disc drive assembly is connected to the first impeller, and the rotor of the second disc drive assembly is connected to the second impeller.

9. The vertical self-priming centrifugal pump according to claim 8, characterized in that, The cooling chamber includes a first cooling chamber and a second cooling chamber. The first cooling chamber is configured to correspond to the first disc drive assembly, and the second cooling chamber is configured to correspond to the second disc drive assembly. The first cooling chamber and the second cooling chamber are respectively connected to the cooling flow path.

10. The vertical self-priming centrifugal pump according to any one of claims 1 to 6, characterized in that, The pump casing has a curved cavity connecting the water inlet and the pump chamber. A horizontal flow channel is provided between the water inlet and the curved cavity, and a protrusion is provided in the horizontal flow channel.

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