Double-impeller magnetic suspension pump

Abstract

The utility model provides a double-impeller magnetic suspension pump which comprises a rotor, a motor, a pump body and a pump cover. The pump cover is arranged on one side of the pump body, and the motor is arranged on the other side of the pump body. A pump cavity is formed between the pump cover and the pump body; the rotor is arranged in the pump cavity in a suspension and non-contact mode, the rotor is provided with the first impeller and the second impeller, the first impeller and the second impeller can be used for pumping liquid, the flow of the magnetic suspension pump is improved, meanwhile, the first impeller and the second impeller can balance axial force borne by the rotor in the rotating process of the rotor, and the magnetic suspension effect is improved. And the rotor is uniformly stressed, so that the good stability of the pump in the working process is maintained.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic levitation pumps, and in particular to a double-impeller magnetic levitation pump. Background Art

[0002] Magnetic levitation pumps have been widely used in many fields due to their unique contactless suspension technology. For example, in the pharmaceutical and biotechnology fields, they are used to transport drug solutions, cell culture media, vaccines, etc.; in the semiconductor field, they are used for high-purity liquid delivery, equipment cooling, precise flow control, etc., providing strong support for the stability, efficiency, cleanliness and precision of semiconductor manufacturing processes.

[0003] Flow rate is one of the main parameters to measure the performance of magnetic levitation pumps. Flow rate refers to the volume of liquid pumped per unit time. Flow rate will directly affect the applicability and efficiency of magnetic levitation pumps in specific applications. Usually, the rotor of a magnetic levitation pump has only one impeller, but the rotor with one impeller has a small pumping flow rate. At the same time, in the rotor of a single impeller, the axial force on the rotor is unbalanced when the rotor rotates. Usually, in order to balance the axial force of the rotor, it is necessary to set a balancing hole and a back blade. However, setting a balancing hole and a back blade can only balance the axial force of some working points well and cannot increase the flow range of the pump. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a dual-impeller magnetic levitation pump, including a rotor, a motor, a pump body and a pump cover; the pump cover is arranged on one side of the pump body, and the motor is arranged on the other side of the pump body; a pump chamber is formed between the pump cover and the pump body; the rotor is suspended and contactlessly arranged in the pump chamber, and the rotor includes a rotor body, a first impeller, a second impeller and a permanent magnet; the first impeller is arranged on one side of the rotor body, the second impeller is arranged on the other side of the rotor body, and the permanent magnet is arranged in the rotor body.

[0005] In some embodiments of the present application, an inlet hole is provided on the rotor body, and a permanent magnet is provided on the outer side of the inlet hole; an impeller first inlet and an impeller first outlet are provided on the first impeller, and an impeller second inlet and an impeller second outlet are provided on the second impeller; the impeller first inlet, the impeller first outlet, the impeller second inlet, the impeller second outlet and the inlet hole are connected to each other.

[0006] In some embodiments of the present application, the pump chamber includes a first pump chamber close to the pump cover and a second pump chamber close to the motor, and the second pump chamber includes a reflux channel for reflux of liquid pumped by the second impeller.

[0007] In some embodiments of the present application, the first impeller and the second impeller are symmetrically or asymmetrically arranged.

[0008] In some embodiments of the present application, the first impeller includes a plurality of first blades arranged at intervals in a clockwise or counterclockwise direction, and a first impeller outlet for pumping fluid is formed between each of the first blades.

[0009] In some embodiments of the present application, the second impeller includes a plurality of second blades arranged at intervals in a clockwise or counterclockwise direction, and a second impeller outlet for pumping fluid is formed between each of the second blades.

[0010] In some embodiments of the present application, the first impeller further includes a first cover plate, the first cover plate is disposed on the first blade, and a first flow hole is disposed on the first cover plate.

[0011] In some embodiments of the present application, the second impeller further includes a second cover plate, the second cover plate is disposed on the second blades, and a second flow hole is disposed on the second cover plate.

[0012] In some embodiments of the present application, the second pump chamber includes 1 to 8 reflux channels, and each of the reflux channels is arranged along the circumference of the rotor.

[0013] In some embodiments of the present application, reflow grooves are provided on the motor, and the number and positions of the reflow grooves are matched with the number and positions of the reflow channels.

[0014] In some embodiments of the present application, a pump inlet is provided on the pump cover, an outlet throat is provided on the pump body, a pump outlet is provided in the outlet throat, and the pump outlet includes a first outlet chamber, a second outlet chamber and a third outlet chamber that are interconnected.

[0015] In some embodiments of the present application, the cross-sectional shape of the first outlet cavity is rectangular.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects: in the double-impeller magnetic levitation pump of the present application, a first impeller and a second impeller are arranged on the rotor, and the first impeller and the second impeller can both be used to pump liquid, thereby increasing the flow rate of the magnetic levitation pump; at the same time, during the rotation of the rotor, the first impeller and the second impeller can balance the axial force exerted on the rotor, so that the rotor is evenly stressed, thereby enabling the pump to maintain good stability during operation.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of this document are used to provide a further understanding of this document. The exemplary embodiments and descriptions of this document are used to explain this document and do not constitute an improper limitation on this document. In the accompanying drawings:

[0019] Figure 1 is a partial cross-sectional view of a front view of a double-impeller magnetic suspension pump provided by an exemplary embodiment of the present application;

[0020] Figure 2 is a partial cross-sectional view of a top view of a double-impeller magnetic suspension pump provided by an exemplary embodiment of the present application;

[0021] Figure 3 It is a right side view of a double-impeller magnetic suspension pump provided by an exemplary embodiment of the present application;

[0022] Figure 4 is a front view of a magnetic suspension rotor provided by an exemplary embodiment of the present application;

[0023] Figure 5 is a top view of a magnetically suspended rotor provided by an exemplary embodiment of the present application;

[0024] Figure 6 is a cross-sectional view of a magnetic suspension rotor provided by an exemplary embodiment of the present application;

[0025] Figure 7 is a cross-sectional view of a first impeller provided by an exemplary embodiment of the present application;

[0026] Figure 8 is a cross-sectional view of a second impeller provided by an exemplary embodiment of the present application.

[0027] Fig. 9 is a front view of a magnetically suspended rotor provided by another exemplary embodiment of the present application;

[0028] Fig.10 is a bottom view of a magnetic suspension rotor provided by another exemplary embodiment of the present application;

[0029] Fig.11 is a cross-sectional view of a magnetically suspended rotor provided by another exemplary embodiment of the present application;

[0030] Fig.12 It is a right side view of a pump body provided by an exemplary embodiment of the present application;

[0031] Fig.13 is a sectional view of a front view of a pump body provided by an exemplary embodiment of the present application;

[0032] Fig.14 It is a left side view of a pump body provided by an exemplary embodiment of the present application;

[0033] Fig.15 is a top view of a pump body provided by an exemplary embodiment of the present application;

[0034] Fig.16It is a right side view of a motor provided by an exemplary embodiment of the present application.

[0035] In the figure:

[0036] 10. rotor; 101. rotor body; 1011. inlet hole; 102. first impeller; 1021. first inlet of impeller; 1022. first outlet of impeller; 1023. first blade; 1024. first cover plate; 103. second impeller; 1031. second inlet of impeller; 1032. second outlet of impeller; 1033. second blade; 1034. second cover plate; 104. permanent magnet;

[0037] 20. Pump body; 201. First pump chamber; 202. Second pump chamber; 2021. Reflux channel; 203. Outlet throat; 204. Pump outlet; 2041. First outlet chamber; 2042. Second outlet chamber; 2043. Third outlet chamber; 30. Pump cover; 301. Pump inlet; 40. Motor; 401. Reflux groove. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0039] Magnetic levitation pumps have been widely used in many fields due to their unique contactless suspension technology. For example, in the pharmaceutical and biotechnology fields, they are used to transport drug solutions, cell culture media, vaccines, etc.; in the semiconductor field, they are used for high-purity liquid delivery, equipment cooling, precise flow control, etc., providing strong support for the stability, efficiency, cleanliness and precision of semiconductor manufacturing processes.

[0040] Flow rate is one of the main parameters to measure the performance of magnetic levitation pumps. Flow rate refers to the volume of liquid pumped per unit time. Flow rate will directly affect the applicability and efficiency of magnetic levitation pumps in specific applications. Usually, the rotor of a magnetic levitation pump has only one impeller, but the rotor with one impeller has a small pumping flow rate. At the same time, in the rotor of a single impeller, the axial force on the rotor is unbalanced when the rotor rotates. Usually, in order to balance the axial force of the rotor, it is necessary to set a balancing hole and a back blade. However, setting a balancing hole and a back blade can only balance the axial force of some working points well and cannot increase the flow range of the pump.

[0041] Based on this, an exemplary embodiment of the present application provides a dual-impeller magnetic levitation pump, in which a first impeller and a second impeller are arranged on the rotor of the pump, and the first impeller and the second impeller can both be used to pump liquid, thereby increasing the flow rate of the magnetic levitation pump. At the same time, the first impeller and the second impeller can balance the axial force exerted on the rotor during the rotation of the rotor, so that the rotor is evenly stressed, thereby enabling the pump to maintain good stability during operation.

[0042] An exemplary embodiment of the present application provides a dual-impeller magnetic suspension pump, such as Figures 1 to 3 As shown, the magnetic levitation pump includes a rotor 10, a motor 40, a pump body 20 and a pump cover 30. The pump cover 30 is arranged on one side of the pump body 20, and the motor 40 is arranged on the other side of the pump body 20. A pump cavity is formed between the pump cover 30 and the pump body 20. The rotor 10 is suspended and arranged in the pump cavity without contact. The rotor 10 includes a rotor body 101, a first impeller 102, a second impeller 103 and a permanent magnet 104; the first impeller 102 is arranged on one side of the rotor body 101, the second impeller 103 is arranged on the other side of the rotor body 101, and the permanent magnet is arranged in the rotor body. In this way, both the first impeller and the second impeller can be used to pump liquid, which increases the flow rate of the magnetic levitation pump. At the same time, the first impeller and the second impeller can balance the axial force on the rotor during the rotation of the rotor, so that the rotor is evenly stressed, thereby maintaining good stability of the pump during operation.

[0043] like Figures 4 to 8 As shown, the rotor body 101 is provided with an inlet hole 1011, and a permanent magnet 104 is provided on the outer side of the inlet hole 1011; the first impeller 102 is provided with an impeller first inlet 1021 and an impeller first outlet 1022, and the second impeller 103 is provided with an impeller second inlet 1031 and an impeller second outlet 1032; the impeller first inlet 1021, the impeller first outlet 1022, the impeller second inlet 1031, the impeller second outlet 1032 and the inlet hole 1011 are interconnected. In this way, both the first impeller 102 and the second impeller 103 can be used to pump liquid. A portion of the liquid flowing in from the pump inlet 301 is centrifugally pressurized and pumped into the pump chamber by the first impeller 102, and the other portion passes through the inlet hole 1011, enters the second impeller 103 and is centrifugally pressurized and pumped into the pump chamber by the second impeller 103. The first impeller 102 and the second impeller 103 pump liquid at the same time, thereby increasing the flow rate of the magnetic levitation pump. At the same time, during the rotation of the rotor 10, the first impeller 102 and the second impeller 103 can balance the axial force exerted on the rotor 10, so that the rotor 10 is evenly stressed, thereby enabling the pump to maintain good stability during operation.

[0044] In one embodiment, the first impeller 102 and the second impeller 103 can be symmetrically or asymmetrically arranged. When the first impeller 102 and the second impeller 103 are symmetrically arranged, the first impeller 102 and the second impeller 103 are the same impellers. At this time, the symmetrically arranged first impeller 102 and the second impeller 103 can reduce the axial unbalanced force of the rotor 10 during the operation of the magnetic levitation pump, improve the axial stability of the rotor 10, and thus improve the stability of the operation of the magnetic levitation pump. When the first impeller 102 and the second impeller 103 are asymmetrically arranged, compared with the rotor 10 with a single impeller, although the first impeller 102 and the second impeller 103 are asymmetrically arranged, they can still reduce the axial unbalanced force of the rotor 10, improve the axial stability of the rotor 10, and thus improve the stability of the operation of the magnetic levitation pump.

[0045] like Figure 7 As shown, the first impeller 102 includes a plurality of first blades 1023 arranged in a clockwise or counterclockwise rotation direction, and an impeller first outlet 1022 for pumping fluid is formed between each first blade 1023. The number of the first blades 1023 can be 3 to 8. Preferably, the first impeller 102 includes 6 first blades 1023, and 6 impeller first outlets 1022 are formed between the 6 first blades 1023.

[0046] like Figure 6 As shown, the first impeller 102 further includes a first cover plate 1024 . The first cover plate 1024 is disposed on the first blades 1023 . The first cover plate 1024 is provided with a first flow hole.

[0047] like Figure 8 As shown, the second impeller 103 includes a plurality of second blades 1033 arranged in a clockwise or counterclockwise rotation direction, and an impeller second outlet 1032 for pumping fluid is formed between each second blade 1033. The number of the second blades 1033 can be 3 to 8. Preferably, the second impeller 103 includes 6 second blades 1033, and 6 impeller second outlets 1032 are formed between the 6 second blades 1033.

[0048] The second impeller 103 further includes a second cover plate 1034, which is arranged on the second blade 1033 and is provided with a second flow hole. After the liquid flowing into the inlet enters the pump cavity, it enters the inside of the rotor 10 through the first flow hole, wherein a part of the liquid is pumped into the pump cavity through the first impeller outlet 1022 on the first impeller 102, and flows out of the pump through the pump outlet 204; a part of the liquid enters the second impeller 103 through the inflow hole 1011 on the rotor body 101, and is pumped into the pump cavity through the second impeller outlet 1032 under the pumping of the second impeller 103, and finally flows out of the pump through the pump outlet 204; the first impeller 102 and the second impeller 103 work simultaneously to increase the flow rate of the magnetic levitation pump.

[0049] In one embodiment, if Figures 9 to 11 As shown, the second cover plate 1034 may not be provided on the second impeller 103. In this case, the second impeller outlet 1032 is bottom-opening. Under the centrifugal force provided by the rotation of the rotor 10, the liquid can still flow out from the second impeller outlet 1032, thereby increasing the flow rate of the magnetic levitation pump.

[0050] The pump chamber includes a first pump chamber 201 near the pump cover 30 and a second pump chamber 202 near the motor 40. The second pump chamber 202 includes a reflux channel 2021 for reflux of the liquid pumped by the second impeller 103. The reflux channel 2021 provides a reflux channel for the liquid pumped by the second impeller 103. The liquid pumped by the second impeller 103 can enter the first pump chamber 201 through the reflux channel 2021, merge with the liquid pumped by the first impeller 102, and flow out of the suspension pump through the pump outlet 204.

[0051] like Figures 12 to 14 As shown, in the pump body 20, the second pump chamber 202 includes 1 to 8 reflux channels 2021, and each reflux channel 2021 is arranged along the circumference of the rotor 10. Exemplarily, the second pump chamber 202 includes at least one reflux channel 2021 for the liquid pumped by the second impeller 103 to flow back to the first pump chamber 201. Preferably, the second pump chamber 202 includes three reflux channels 2021, which are arranged at an angle of 120°, and the central intersection point is the rotation axis of the rotor 10. The evenly arranged reflux channels 2021 not only provide a reflux channel for the liquid pumped by the second impeller 103, but also reduce the circumferential unbalanced force of the rotor 10, improve the circumferential stability of the rotor 10, and thus improve the stability of the operation of the magnetic levitation pump.

[0052] The pump cover 30 is provided with a pump inlet 301, the pump body 20 is provided with an outlet throat 203, and the outlet throat 203 is provided with a pump outlet 204. Fig.13As shown, the pump outlet 204 includes a first outlet chamber 2041, a second outlet chamber 2042 and a third outlet chamber 2043 that are connected to each other. From the first outlet chamber 2041 to the third outlet chamber 2043, the cross-sectional sizes of the first outlet chamber 2041, the second outlet chamber 2042 and the third outlet chamber 2043 increase in sequence.

[0053] refer to Figure 2 and 3 It can be known that, under normal circumstances, the connection between the pump body 20 and the motor 40 and the pump cover 30 is a fastener connection. The fasteners are used to tightly connect the pump body 20, the pump cover 30, the motor 40 and other components together to form a complete pressure vessel, so as to evenly distribute the internal pressure to the materials of various parts of the pump body, and ensure that the entire structure can bear the pressure together without deformation or rupture. The spacing between the fasteners is closely related to the pressure value of the pump. The material, specification, quantity and preload setting of the fasteners must meet the design requirements to ensure effective pressure transmission and prevent failure due to local stress concentration. Under normal circumstances, the outlet throat 203 cannot be set at the position where the fasteners are installed, but can only be set between two fasteners. Therefore, the spacing between the fasteners limits the position and size of the outlet throat 203.

[0054] like Fig.15 As shown, in order to increase the flow rate of the magnetic levitation pump, the cross-sectional shape of the first outlet cavity 2041 is preferably a rectangle. It is known from common knowledge that, under the condition of a certain spacing, the cross-sectional area of ​​the rectangular first outlet cavity 2041 is larger than the cross-sectional area of ​​the circular first outlet cavity 2041. Therefore, setting the cross-sectional area of ​​the first outlet cavity 2041 to a rectangle can increase the capacity of the first outlet cavity 2041, thereby increasing the flow rate of the magnetic levitation pump.

[0055] In order to match the reflux channel 2021 provided on the pump body 20, as Fig.16 As shown, the motor 40 is provided with return grooves 401 , and the number and positions of the return grooves 401 are matched with the number and positions of the return channels 2021 .

[0056] In the dual-impeller magnetic levitation pump of the present application, both the first impeller 102 and the second impeller 103 can be used to pump liquid, thereby increasing the flow rate of the magnetic levitation pump. At the same time, during the rotation of the rotor 10, the first impeller 102 and the second impeller 103 can balance the axial force exerted on the rotor 10, so that the rotor 10 is subjected to uniform force, thereby enabling the pump to maintain good stability during operation.

[0057] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of more restrictions, the elements defined by the sentence "comprising..." do not exclude the presence of other identical elements in the article or device comprising the elements.

[0058] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0059] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the intention of the present application also includes these modifications and variations.

Claims

1. A double-impeller magnetic suspension pump, characterized in that: It includes a rotor, a motor, a pump body and a pump cover; the pump cover is arranged on one side of the pump body, and the motor is arranged on the other side of the pump body; a pump cavity is formed between the pump cover and the pump body; the rotor is suspended and non-contactedly arranged in the pump cavity, and the rotor includes a rotor body, a first impeller, a second impeller and a permanent magnet; the first impeller is arranged on one side of the rotor body, the second impeller is arranged on the other side of the rotor body, and the permanent magnet is arranged in the rotor body.

2. The double-impeller magnetic suspension pump according to claim 1, characterized in that: The rotor body is provided with an inlet hole, and a permanent magnet is provided on the outer side of the inlet hole; the first impeller is provided with an impeller first inlet and an impeller first outlet, and the second impeller is provided with an impeller second inlet and an impeller second outlet; the impeller first inlet, the impeller first outlet, the impeller second inlet, the impeller second outlet and the inlet hole are connected to each other.

3. The dual-impeller magnetic suspension pump according to claim 1, characterized in that: The pump chamber comprises a first pump chamber close to the pump cover and a second pump chamber close to the motor, wherein the second pump chamber comprises a return channel for the return flow of the liquid pumped by the second impeller.

4. The dual-impeller magnetic suspension pump according to claim 1, characterized in that: The first impeller and the second impeller are arranged symmetrically or asymmetrically.

5. The dual-impeller magnetic suspension pump according to claim 1, characterized in that: The first impeller includes a plurality of first blades arranged in a clockwise or counterclockwise rotation direction and at intervals, and a first impeller outlet for pumping fluid is formed between each of the first blades.

6. The dual-impeller magnetic suspension pump according to claim 1, characterized in that: The second impeller includes a plurality of second blades arranged in a clockwise or counterclockwise rotation direction and at intervals, and a second impeller outlet for pumping fluid is formed between each of the second blades.

7. The dual-impeller magnetic suspension pump according to claim 5, characterized in that: The first impeller further includes a first cover plate, which is disposed on the first blades and has a first flow hole.

8. The dual-impeller magnetic suspension pump according to claim 6, characterized in that: The second impeller further includes a second cover plate, the second cover plate is disposed on the second blades, and a second flow hole is disposed on the second cover plate.

9. The dual-impeller magnetic suspension pump according to claim 3, characterized in that: The second pump chamber includes 1 to 8 reflux channels, and each of the reflux channels is arranged along the circumferential direction of the rotor.

10. The dual-impeller magnetic suspension pump according to claim 9, characterized in that: The motor is provided with reflow grooves, and the number and positions of the reflow grooves are matched with the number and positions of the reflow channels.

11. The dual-impeller magnetic suspension pump according to claim 1, characterized in that: The pump cover is provided with a pump inlet, the pump body is provided with an outlet throat, a pump outlet is provided in the outlet throat, and the pump outlet includes a first outlet cavity, a second outlet cavity and a third outlet cavity which are interconnected.

12. The dual-impeller magnetic suspension pump according to claim 11, characterized in that: The cross-sectional shape of the first outlet cavity is rectangular.

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