Axial multistage pump

Abstract

The utility model discloses an axial multi-stage pump, and relates to the technical field of fluid transportation equipment. The axial multi-stage pump comprises at least one head-section pump body, at least one tail-section pump body, a plurality of axial magnetic flux motors and a plurality of impeller assemblies. The first-section pump body is provided with a water inlet; the tail-section pump body is provided with a water outlet communicated with the water inlet; the multiple axial magnetic flux motors are sequentially connected in series in the first direction and located in the head-section pump body and the tail-section pump body correspondingly, and each axial magnetic flux motor comprises a stator part and a rotor part; the impeller assemblies are connected with the rotor assemblies in a one-to-one correspondence mode. By adopting the technology provided by the utility model, the miniaturization and the light weight of the pump body can be effectively realized.

Description

Technical Field

[0001] This utility model relates to the field of fluid transport equipment technology, and specifically to an axial multistage pump. Background Technology

[0002] Multistage pumps are commonly used in industrial fluid transport equipment. Traditional multistage pumps typically have multiple impellers connected in series, driven by a single motor to achieve progressive pressure increase of the fluid. However, because the eddies in a multistage pump increase the flow resistance between the impellers, more mechanical energy is consumed in overcoming the forces of the eddies. Therefore, to meet the flow and head requirements, traditional multistage pumps generally increase the number of impellers. For example, to set up a multistage pump with a head of 100M, it may be necessary to add 5 to 6 impellers to meet the flow and head requirements. This results in an excessively large multistage pump size and a greater power demand on the motor, ultimately leading to a higher cost. Utility Model Content

[0003] This invention provides an axial multistage pump to solve the problem of large size in existing multistage pumps.

[0004] To solve the above-mentioned technical problems, the present invention provides an axial multistage pump, which includes: at least one first-stage pump body, at least one last-stage pump body, multiple axial flux motors, and multiple impeller assemblies.

[0005] The first section of the pump body is provided with an inlet; the last section of the pump body is provided with an outlet that communicates with the inlet; a plurality of axial flux motors are connected in series along a first direction and are respectively located in the first section of the pump body and the last section of the pump body, wherein the axial flux motor includes a stator and a rotor; the impeller assembly is connected to the rotor assembly in a one-to-one correspondence.

[0006] The beneficial effects of the technical solution provided by this utility model compared to the prior art are as follows:

[0007] By setting up at least one initial pump body and at least one final pump body, and installing multiple axial flux motors connected in series in each stage, with each axial flux motor driving a corresponding impeller assembly, the multi-stage pump operates such that each pump body is relatively independent yet works collaboratively to meet flow and head requirements. Furthermore, the series connection of the axial flux motors allows for flexible combination of each pump body according to actual needs.

[0008] In this multi-stage pump, multiple axial motors are connected one-to-one with the impeller assembly and linked in series. This reduces the drive obstruction caused by eddy currents in each pump stage (such as the inlet and outlet stages), thereby improving energy efficiency. Furthermore, the drive mechanism used in this multi-stage pump is an axial flux motor, comprising a stator and a rotor. Compared to conventional radial motor multi-stage pumps, it is smaller and lighter, and its effective magnetic surface area is located on the rotor surface, allowing it to provide greater torque within the same volume. This enables miniaturization and lightweight design of the multi-stage pump.

[0009] In some implementations, the inlet and outlet are symmetrically arranged along the first direction and interconnected to form a flow channel that runs through the plurality of axial flux motors along the first direction.

[0010] By adopting the above technical solution, a flow channel is set in the middle of the axial flux motor, that is, the flow channel can pass through the center of the stator. Compared with the traditional motor connected by the central shaft, which makes the flow channel only set on one side of the rotor, the above design of the flow channel passing through the middle of the axial flux motor allows the fluid in the flow channel to provide a certain heat dissipation function when the multi-stage pump is operating.

[0011] Furthermore, the flow channel in the middle of the axial flux motor reduces the space required for the spindle, allowing for a flat design of the multistage pump and further reducing the pump body volume.

[0012] In some embodiments, the impeller assembly includes a first impeller, which has a plurality of spiral outlets and a first spiral flow channel corresponding to and communicating with the spiral outlets in a circumferential ring. The first impeller has a first water collection chamber communicating with the plurality of first spiral flow channels on the side facing the inlet in the first direction.

[0013] By adopting the above technical solution, the design of the spiral flow channel can guide the fluid into spiral motion, reduce the turbulence and energy loss of the fluid in the impeller, thereby improving the fluid transmission efficiency and optimizing the pressure distribution applied by the fluid to the first impeller.

[0014] In some embodiments, the impeller assembly further includes a second impeller spaced apart from the first impeller along the first direction. The second impeller is circumferentially provided with a plurality of spiral inlets and a second spiral flow channel corresponding to and communicating with the spiral inlets. The second impeller is provided with a second water collection chamber communicating with the plurality of second spiral flow channels on the side away from the inlets along the first direction.

[0015] By adopting the above technical solution, a second impeller is set up to cooperate with the first impeller, which can gather the fluid dispersed by the first impeller, so as to further optimize the distribution and flow of the fluid and improve the transmission efficiency.

[0016] In some embodiments, the axial multistage pump further includes one or more intermediate pump sections located along the first direction between the first pump section and the last pump section, wherein the intermediate pump section is equipped with the axial flux motor and the impeller assembly connected to the axial flux motor. Using the above technical solution, when the flow rate or head requirement is large, one or more intermediate pump sections can be added to expand and meet the aforementioned requirements.

[0017] In some embodiments, the outlet is located on the outer periphery of the final pump body. Further, when the outlet is located on the outer periphery of the final pump body, the impeller assembly includes a first impeller, and a first helical flow channel of the first impeller communicates with the outlet.

[0018] By adopting the above technical solution, the outlet is set on the outer periphery of the last stage pump body, which makes the design of the entire multistage pump more compact. At the same time, the impeller assembly located in the last stage pump body only includes the first impeller to ensure that the fluid can be discharged smoothly from the outlet.

[0019] In some embodiments, the axial multistage pump includes multiple fastening screws, which are respectively connected to the first pump body section, the last pump body section, and / or the middle pump body section along the first direction. By employing the above technical solution, the multiple pump body sections are tightly connected by the fastening screws to form a single integral structure, thereby ensuring the overall rigidity of the multistage pump.

[0020] In some implementations, the axial multistage pump further includes multiple power interfaces, each of which corresponds to one of the axial flux motors, to enable independent power supply and control for each axial flux motor and improve the overall flexibility of the multistage pump.

[0021] In some embodiments, the axial multistage pump further includes a first sealing chamber, a second sealing chamber, and a flow chamber. The first sealing chamber is used to house the stator section, and the second sealing chamber and the impeller assembly are located within the flow chamber. The second sealing chamber is used to house the rotor section.

[0022] The above technical solution uses the design of the first and second sealed chambers to isolate the fluid from contact with the axial flux motor. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0024] Figure 1 This is a cross-sectional view of an embodiment of an axial multistage pump provided by this utility model;

[0025] Figure 2 This is a simplified diagram illustrating the fluid flow direction of an embodiment of an axial multistage pump provided by this utility model. Figure 1 ;

[0026] Figure 3 This is a three-dimensional structural schematic diagram of an embodiment of the first impeller of an axial multistage pump provided by this utility model;

[0027] Figure 4 This is a three-dimensional structural schematic diagram of an embodiment of the second impeller of an axial multistage pump provided by this utility model;

[0028] Figure 5 This is a simplified diagram illustrating the fluid flow direction of an embodiment of an axial multistage pump provided by this utility model. Figure 2 ;

[0029] Figure 6 This is a three-dimensional structural schematic diagram of an embodiment of an axial multistage pump provided by this utility model.

[0030] In the picture:

[0031] 10. First pump section; 11. Inlet; 20. Last pump section; 21. Outlet; 30. Axial flux motor; 31. Stator; 32. Rotor;

[0032] 40. Impeller assembly; 41. First impeller; 410. Spiral outlet; 411. First spiral flow channel; 412. First water collection chamber; 42. Second impeller; 420. Spiral inlet; 421. Second spiral flow channel; 422. Second water collection chamber; 50. Flow channel;

[0033] 60. Fastening screw; 61. Power interface; 62. First sealed chamber; 63. Second sealed chamber; 64. Water flow chamber; 65. Intermediate pump body. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0035] See Figures 1 to 2 As shown, Figure 1A cross-sectional view of one embodiment of an axial multistage pump provided in this application is shown; Figure 2 A schematic diagram of the fluid flow direction of an embodiment of an axial multistage pump provided in this application is shown. Figure 1 The arrow indicates the direction of fluid flow.

[0036] In some embodiments, the axial multistage pump includes: at least one primary pump body 10, at least one secondary pump body 20, multiple axial flux motors 30, and multiple impeller assemblies 40. The primary pump body 10 is provided with an inlet 11; the secondary pump body 20 is provided with an outlet 21 communicating with the inlet 11; the multiple axial flux motors 30 are connected in series along a first direction and are respectively located in the primary pump body 10 and the secondary pump body 20, wherein each axial flux motor 30 includes a stator 31 and a rotor 32; the impeller assemblies 40 are connected to the rotor assemblies one by one.

[0037] In this embodiment, by providing at least one first-stage pump body 10 and at least one last-stage pump body 20, and by providing multiple axial flux motors 30 connected in series, with each axial flux motor 30 driving a corresponding impeller assembly 40, the multi-stage pump operates such that each pump body is relatively independent yet works collaboratively to meet both flow rate and head requirements. The series connection of the axial flux motors 30 also allows each stage of the multi-stage pump to be freely combined according to actual needs. For example, for instance... Figure 1 As shown, an axial multistage pump can be equipped with a first pump body 10 and a last pump body 20. However, this application does not limit the number of first pump bodies 10 and last pump bodies 20 of the axial multistage pump. For example, when two outlets 21 are provided, two last pump bodies 20 can be provided to meet the simultaneous drainage requirements.

[0038] In some embodiments, the axial multistage pump may further include one or more intermediate pump sections 65 located along the first direction between the first pump section 10 and the last pump section 20. Each intermediate pump section 65 is equipped with a corresponding axial flux motor 30 and an impeller assembly 40 connected to the axial flux motor 30. This allows for flexible combinations to expand the pump section 65 to meet larger flow or head requirements, such as... Figure 1 A first-stage pump body 10, a middle-stage pump body 65, and a final-stage pump body 20 are shown.

[0039] In this multistage pump, multiple axial motors are connected one-to-one with the impeller assembly 40 and connected in series. This reduces the driving obstruction caused by eddy currents in each pump stage (such as the inlet and outlet pump stages), thereby improving the efficient utilization of energy. Furthermore, the drive mechanism used in this multistage pump is an axial flux motor 30, comprising a stator 31 and a rotor 32. Compared to conventional radial motor multistage pumps, it is smaller and lighter, and its effective magnetic surface area is located on the rotor surface, allowing it to provide greater torque within the same volume. This enables the multistage pump to achieve miniaturization and lightweight design.

[0040] In some implementations, the inlet 11 and the outlet 21 are symmetrically arranged along a first direction and interconnected to form a flow channel 50 through which a plurality of axial flux motors 30 pass along the first direction.

[0041] In this embodiment of the application, combined with Figure 2 As shown, a flow channel 50 is located in the middle of the axial flux motor 30, meaning that the flow channel 50 can penetrate through the center of the stator. Compared to traditional motors where the flow channel 50 is connected by a central shaft and can only be located on one side of the rotor, the design of the flow channel 50 penetrating through the middle of the axial flux motor 30 allows the fluid within the flow channel 50 to provide a certain degree of heat dissipation during operation of the multistage pump. Furthermore, the presence of the flow channel 50 in the middle of the axial flux motor 30 reduces the space required for the spindle, allowing for a flattened design of the multistage pump and further reducing the pump body size.

[0042] In some embodiments, the axial multistage pump is further provided with a first sealing chamber 62, a second sealing chamber 63 and a flow chamber 64. The first sealing chamber 62 is used to house the stator section 31, and the second sealing chamber 63 and the impeller assembly 40 are located in the flow chamber 64. The second sealing chamber 63 is used to house the rotor section 32.

[0043] In this embodiment, the design of the first sealed chamber 62 and the second sealed chamber 63 is used to isolate the fluid from contact with the axial flux motor 30.

[0044] See Figure 3 As shown, Figure 3 A three-dimensional structural schematic diagram of an embodiment of the first impeller 41 of an axial multistage pump provided in this application is shown.

[0045] In some embodiments, the impeller assembly 40 includes a first impeller 41, which is provided with a plurality of spiral outlets 410 and a first spiral flow channel 411 corresponding to and communicating with the spiral outlets 410. The first impeller 41 is provided with a first water collection chamber 412 communicating with the plurality of first spiral flow channels 411 on the side facing the inlet 11 in a first direction.

[0046] In this embodiment, the spiral flow channel 50 is designed to guide the fluid into a spiral motion, reducing turbulence and energy loss within the impeller, thereby improving fluid transport efficiency and optimizing the pressure distribution exerted by the fluid on the first impeller 41. For example, in conjunction with... Figure 2 As shown, the first impeller 41 is connected to the rotor.

[0047] See Figure 4 As shown, Figure 4 A three-dimensional structural schematic diagram of an embodiment of the second impeller 42 of an axial multistage pump provided in this application is shown.

[0048] In some embodiments, the impeller assembly 40 further includes a second impeller 42 spaced apart from the first impeller 41 along a first direction. The second impeller 42 is circumferentially provided with a plurality of spiral inlets 420 and second spiral flow channels 421 corresponding to and communicating with the spiral inlets 420. The second impeller 42 is provided with a second water collection cavity 422 communicating with the plurality of second spiral flow channels 421 on the side of the second impeller 42 away from the inlet 11 along the first direction.

[0049] In this embodiment, a second impeller 42 is provided to cooperate with the first impeller 41, which can gather the fluid dispersed by the first impeller 41 to further optimize the distribution and flow of the fluid and improve the transmission efficiency.

[0050] See Figure 5 As shown, Figure 5 A schematic diagram of the fluid flow direction of an embodiment of an axial multistage pump provided in this application is shown. Figure 2 The arrow indicates the direction of fluid flow.

[0051] In some embodiments, the outlet 21 is located on the outer periphery of the final pump body 20. Further, when the outlet 21 is located on the outer periphery of the final pump body 20, the impeller assembly 40 includes a first impeller 41, and the first helical flow channel 411 of the first impeller 41 is in communication with the outlet 21.

[0052] In this embodiment, the outlet 21 is located on the outer periphery of the final pump body 20, which makes the design of the entire multistage pump more compact. At the same time, the impeller assembly 40 located in the final pump body 20 only includes the first impeller 41 to ensure that the fluid can be discharged smoothly from the outlet 21.

[0053] See Figure 6 As shown, Figure 6 A three-dimensional structural schematic diagram of an embodiment of an axial multistage pump provided in this application is shown.

[0054] In some embodiments, the axial multistage pump includes multiple fastening screws 60, which are respectively connected to the first pump body 10, the last pump body 20, and / or the middle pump body 65 along a first direction. In the embodiments of this application, the multiple pump body segments are tightly connected by the fastening screws 60 to form an integral structure, thereby ensuring the overall rigidity of the multistage pump.

[0055] In some implementations, the axial multistage pump also includes multiple power interfaces 61, each corresponding to an axial flux motor 30, to enable independent power supply and control for each axial flux motor 30, thereby improving the overall flexibility of the multistage pump.

[0056] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, should be included within the protection scope of this utility model.

Claims

1. An axial multistage pump, characterized in that, include: At least one primary pump body, wherein the primary pump body is provided with a water inlet; At least one end-stage pump body, wherein the end-stage pump body is provided with an outlet communicating with the inlet; Multiple axial flux motors are connected in series along a first direction and are respectively located in the first section of the pump body and the last section of the pump body, wherein each axial flux motor includes a stator and a rotor. Multiple impeller assemblies are connected to the rotor in a one-to-one correspondence.

2. The axial multistage pump according to claim 1, characterized in that, The inlet and outlet are symmetrically arranged along the first direction and interconnected to form a flow channel that runs through the plurality of axial flux motors along the first direction.

3. The axial multistage pump according to claim 1, characterized in that, The impeller assembly includes a first impeller, which has a plurality of spiral water outlets and a first spiral flow channel corresponding to and communicating with the spiral water outlets in a circumferential manner. The first impeller has a first water collection chamber communicating with the plurality of first spiral flow channels on the side facing the water inlet in the first direction.

4. The axial multistage pump according to claim 3, characterized in that, The impeller assembly further includes a second impeller spaced apart from the first impeller along the first direction. The second impeller is circumferentially provided with a plurality of spiral inlets and a second spiral flow channel corresponding to and communicating with the spiral inlets. The second impeller is provided with a second water collection chamber communicating with the plurality of second spiral flow channels on the side away from the inlets along the first direction.

5. The axial multistage pump according to claim 1, characterized in that, The axial multistage pump further includes one or more intermediate pump bodies located along the first direction between the first pump body and the last pump body, wherein the intermediate pump body is provided with the axial flux motor and the impeller assembly connected to the axial flux motor.

6. The axial multistage pump according to claim 1, characterized in that, The outlet is located on the outer periphery of the final section of the pump body.

7. The axial multistage pump according to claim 3 or 6, characterized in that, When the outlet is located on the outer periphery of the final pump body, the impeller assembly includes a first impeller, and the first helical flow channel of the first impeller is connected to the outlet.

8. The axial multistage pump according to any one of claims 1 to 6, characterized in that, The axial multistage pump also includes multiple fastening screws, which are respectively connected to the first pump body, the last pump body, and / or the middle pump body along the first direction.

9. The axial multistage pump according to claim 1, characterized in that, The axial multistage pump also includes multiple power interfaces, each of which corresponds to one of the axial flux motors.

10. The axial multistage pump according to any one of claims 1 to 6, characterized in that, The axial multistage pump is further provided with a first sealing chamber, a second sealing chamber and a flow chamber. The first sealing chamber is used to house the stator section, and the second sealing chamber and the impeller assembly are located in the flow chamber. The second sealing chamber is used to house the rotor section.

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