Rotor for centrifugal pump and centrifugal pump

Abstract

The rotor can be driven in a magnetic non-contact mode, the rotor comprises a rotor body, a rotating blade assembly and a rotor end cover, the rotor end cover is provided with a first upper end face which is arranged in an inclined mode, and therefore after the rotor floats upwards due to the pressure of liquid in a pump cavity, the first upper end face is provided with a second upper end face which is arranged in an inclined mode. When the pump is in use, a gap for throttling is formed between the first upper end face of the rotor end cover and the lower end face of the pump cover, pressure on the periphery of the rotor end cover rises, the rotor end cover bears acting force for preventing the rotor from further floating, the rotor can be prevented from further floating and making contact with the pump cover, and friction is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal pumps, and in particular to a centrifugal pump rotor and a centrifugal pump. Background Art

[0002] A type of centrifugal pump. During operation, there is no contact between the rotor and the pump chamber. Therefore, this centrifugal pump has the characteristic of being frictionless and is widely used in fields such as bio-pharmaceutical technology and semiconductors.

[0003] In the prior art, when the flow rate and pressure of this type of centrifugal pump exceed a certain range, its rotor usually comes into contact with the end face of the pump cover, resulting in a certain amount of friction. This friction not only causes wear of the rotor and the end face of the pump cover, but also the particles that may be generated during the friction process will contaminate the liquid being transported. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a rotor for a centrifugal pump and a centrifugal pump.

[0005] In a first aspect of the present application, a centrifugal pump rotor is provided, comprising:

[0006] A rotor body, wherein a permanent magnet is disposed inside the rotor body;

[0007] a rotating blade assembly, the rotating blade assembly being arranged on the rotor body;

[0008] a rotor end cover, the rotor end cover being disposed on the rotating blade assembly;

[0009] Among them, a first flow channel is provided at the center of the rotor end cover; a second flow channel is provided at the center of the rotating blade assembly, and multiple third flow channels are provided around the second flow channel; the first flow channel, the second flow channel and the third flow channel are connected to each other, so that the liquid entering the rotor from the first flow channel is pumped out through the second flow channel and the third flow channel to achieve the purpose of pumping liquid; the rotor end cover has a first upper end surface that is inclined.

[0010] In some embodiments of the present application, the rotor end cover has a second upper end surface parallel to the radial direction at the center position, and the second upper end surface is connected to the first upper end surface.

[0011] In some embodiments of the present application, the rotating blade assembly includes a plurality of blades that are spirally arranged at intervals along the same direction, and a plurality of spiral third flow channels are formed between the blades.

[0012] In some embodiments of the present application, a blade gap is formed between the blade and the upper surface of the rotor body.

[0013] In some embodiments of the present application, the radial dimension of the rotor end cover is greater than or equal to the radial dimension of the rotor body.

[0014] In some embodiments of the present application, the radial dimension of the rotating blade assembly is greater than or equal to the radial dimension of the rotor end cover.

[0015] In some embodiments of the present application, a fourth flow channel is provided at the center of the rotor body, and the fourth flow channel is interconnected with the second flow channel; a back blade is provided at the bottom of the rotor body, and the back blade is configured as a plurality of fifth flow channels diverging along the first flow channel toward the periphery of the rotor body.

[0016] In some embodiments of the present application, the back blade includes eight fifth flow channels.

[0017] In some embodiments of the present application, the rotating blade assembly includes four, five or six blades.

[0018] In a second aspect of the present application, a centrifugal pump is provided, comprising the above-mentioned rotor, a pump cover, and a pump body. The pump cover and the pump body are sealed to form a pump cavity, and the rotor is suspended and contactlessly arranged in the pump cavity; the space formed between the rotor and the pump cover gradually expands from the center of the rotor to both sides.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects: the rotor for the centrifugal pump of the present application can be driven in a magnetic non-contact manner, and includes a rotor body, a rotating blade assembly and a rotor end cover. The rotor end cover has a first upper end face that is inclined. In this way, when the rotor floats due to the pressure of the liquid in the pump chamber, a gap throttling will be formed between the first upper end face of the rotor end cover and the lower end face of the pump cover. At this time, the pressure at the outer periphery of the rotor end cover rises, and the rotor end cover is subjected to a force that prevents the rotor from further floating up, thereby preventing the rotor from further floating up and contacting the pump cover, thereby avoiding friction.

[0020] 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

[0021] The accompanying drawings, which constitute part of this document, are intended to provide a further understanding of this document. The exemplary embodiments and descriptions herein are intended to explain this document and do not constitute an improper limitation on this document. In the accompanying drawings:

[0022] Figure 1 is a schematic structural diagram of a centrifugal pump rotor provided by a first exemplary embodiment of the present application;

[0023] Figure 2 is a top view of a centrifugal pump rotor provided by a first exemplary embodiment of the present application;

[0024] Figure 3 is a bottom view of a centrifugal pump rotor provided by a first exemplary embodiment of the present application;

[0025] Figure 4 is a schematic structural diagram of a centrifugal pump rotor provided by a fourth exemplary embodiment of the present application;

[0026] Figure 5 is a bottom view of a centrifugal pump rotor provided by a second exemplary embodiment of the present application;

[0027] Figure 6 is a bottom view of a centrifugal pump rotor provided by a third exemplary embodiment of the present application;

[0028] Figure 7 is a bottom view of a centrifugal pump rotor provided by a fifth exemplary embodiment of the present application;

[0029] Figure 8 It is a structural schematic diagram of a centrifugal pump provided by an exemplary embodiment of the present application.

[0030] In the picture:

[0031] 10. Rotor; 20. Pump body; 30. Pump cover; 100. Rotor body; 101. Fourth flow channel; 102. Fifth flow channel; 200. Permanent magnet; 300. Rotating blade assembly; 301. Blade; 302. Blade notch; 303. Second flow channel; 304. Third flow channel; 400. Rotor end cover; 401. First upper end face; 402. Second upper end face; 500. First flow channel. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions 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, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this 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 in any way.

[0033] A type of centrifugal pump. During operation, there is no contact between the rotor and the pump chamber. Therefore, this centrifugal pump has the characteristic of being frictionless and is widely used in the fields of biotechnology, pharmaceutical technology, and semiconductors.

[0034] In the prior art, when the flow rate and pressure of this type of centrifugal pump exceed a certain range, its rotor usually comes into contact with the end face of the pump cover, resulting in a certain amount of friction. This friction not only causes wear of the rotor and the end face of the pump cover, but also the particles that may be generated during the friction process will contaminate the liquid being transported.

[0035] Based on this, an exemplary embodiment of the present application provides a rotor for a centrifugal pump, which can be driven in a magnetic non-contact manner. It includes a rotor body, a rotating blade assembly and a rotor end cover. The rotor end cover has a first upper end surface that is inclined. In this way, when the rotor floats due to the pressure of the liquid in the pump chamber, a gap throttling is formed between the first upper end surface of the rotor end cover and the lower end surface of the pump cover. At this time, the pressure at the outer periphery of the rotor end cover rises, and the rotor end cover is subjected to a force that prevents the rotor from further floating up, thereby preventing the rotor from further floating up and contacting the pump cover, thereby avoiding friction.

[0036] An exemplary embodiment of the present application provides a rotor for a centrifugal pump, which can be driven in a magnetic non-contact manner, such as Figures 1 to 3 As shown, the rotor includes: a rotor body 100, in which a permanent magnet 200 is arranged; a rotating blade assembly 300, in which the rotating blade assembly 300 is arranged on the rotor body 100; a rotor end cover 400, in which the rotor end cover 400 is arranged on the rotating blade assembly 300; wherein, a first flow channel 500 is arranged at the center of the rotor end cover 400; a second flow channel 303 is arranged at the center of the rotating blade assembly 300, and a plurality of third flow channels 304 are arranged around the second flow channel 303, and the first flow channel 500, the second flow channel 303, and the third flow channel 304 are interconnected to realize that the liquid entering the interior of the rotor from the first flow channel 500 is pumped out through the second flow channel 303 and the third flow channel 304, thereby achieving the purpose of pumping liquid. The rotor end cover 400 has a first upper end surface 401 that is inclined. In this way, when the rotor floats up due to the pressure of the liquid in the pump chamber, a space that gradually expands from the center of the rotor toward the circumferential direction of the rotor will be formed between the first upper end surface 401 of the rotor end cover 400 and the lower end surface of the pump cover 30, forming a gap throttling. The pressure in this gradually expanding space is higher than that in the central area of ​​the rotor. The rotor end cover 400 will be subjected to the downward force of the liquid, thereby preventing the rotor from floating further, avoiding contact with the lower end surface of the pump cover 30, and avoiding friction.

[0037] The rotating blade assembly 300 includes a plurality of blades 301 arranged spirally in the same direction, and a plurality of spiral third flow channels 304 are formed between the plurality of blades. Figure 3 、 Figure 5 、 Figure 6As shown, the rotating blade assembly 300 includes four, five, or six blades 301, and in this case, four, five, or six third flow channels 304 are correspondingly provided. When the number of blades 301 is four or six, the rotating blade assembly 300 can maintain better dynamic balance, reducing vibration and noise during operation of the centrifugal pump. At the same time, the rotor with six blades 301 can provide higher head and a wider range of applications. When the number of blades 301 is five, the centrifugal pump can maintain a high flow rate and head to meet the application requirements of multiple scenarios.

[0038] Of course, the number of rotating blades 301 may also be three or greater than six.

[0039] In one embodiment, Figure 1 As shown, a blade notch 302 is formed between the blade 301 and the upper surface of the rotor body 100. The blade notch 302 can avoid stress concentration on the blade 301 and prevent friction between the blade 301 and the pump body 20, so that the flow head curve of the centrifugal pump shows a smooth downward trend. The head changes more evenly and gently with the flow rate, making the centrifugal pump stable at different flow rates and helping to maintain the stability of the system pressure.

[0040] In one embodiment, the radial dimension of the rotating blade assembly 300 is greater than or equal to the radial dimension of the rotor end cover 400. Preferably, the radial dimension of the rotating blade assembly 300 is greater than the radial dimension of the rotor end cover 400. In this case, the contact area between the blades 301 and the fluid can be increased, thereby improving the acceleration and momentum transfer efficiency of the fluid, and further increasing the pumping pressure and flow rate.

[0041] The radial dimension of the rotor end cover 400 is greater than or equal to the radial dimension of the rotor body 100. In this way, the force area of ​​the rotor end cover 400 in the axial direction can be increased, thereby increasing the downward force of the liquid on the rotor end cover 400, and then reducing the upward force of the liquid on the rotor, avoiding the rotor from floating excessively and contacting the lower end surface of the pump cover 30, thereby avoiding friction.

[0042] In one embodiment, a fourth flow channel 101 is provided at the center of the rotor body 100, and the fourth flow channel 101 is interconnected with the second flow channel 303. In this way, the fourth flow channel 101 is connected to the first flow channel 500, the second flow channel 303, and the third flow channel 304. The fluid can flow back to the second flow channel 303 through the fourth flow channel 101, thereby reducing the pressure of the liquid at the bottom of the rotor body 100, and thereby reducing the upward force on the bottom of the rotor body 100, thereby avoiding excessive floating of the rotor.

[0043] like Figures 5 to 7As shown, the bottom of the rotor body 100 is provided with back blades 301. The back blades 301 are configured as a plurality of fifth flow channels 102 that radiate from the first flow channel 500 toward the outer periphery of the rotor body 100. The fifth flow channels 102 are interconnected with the fourth flow channels 101. This improves the pressure distribution at the bottom of the rotor body 100, reduces the upward force acting on the bottom of the rotor body 100, and further prevents excessive floating of the rotor.

[0044] Exemplarily, the back blade 301 includes eight fifth flow channels 102 , wherein the eight fifth flow channels 102 may be fully connected or partially connected. Of course, according to actual needs, the back blade 301 may be set to have four or six fifth flow channels 102 .

[0045] In an exemplary embodiment, Figure 4 As shown, the rotor end cover 400 can have various forms. For example, the rotor end cover 400 may have a second upper end surface 402 at its center, which is parallel to the radial direction and connected to the first upper end surface 401. In this case, a space that gradually expands from the rotor center toward the rotor circumference is still formed between the first upper end surface 401 of the rotor end cover 400 and the lower end surface of the pump cover 30, thereby forming a gap throttling. The pressure in this gradually expanding space is higher than that in the rotor center. The rotor end cover 400 is subjected to a downward force from the liquid, which prevents the rotor from floating further, avoiding contact with the lower end surface of the pump cover 30 and thus preventing friction.

[0046] An exemplary embodiment of the present application provides a centrifugal pump, such as Figure 8 As shown, the centrifugal pump includes a rotor 10, a pump cover 30, and a pump body 20. The pump cover 30 and the pump body 20 are sealed to form a pump cavity. The rotor 10 is suspended and contactlessly arranged in the pump cavity. The pump cover 30 is provided with a liquid inlet, which is aligned with the first flow channel 500 on the rotor 10. The pump body 20 is provided with a liquid outlet. When the rotor 10 floats due to the pressure of the liquid in the pump cavity, since the rotor end cover 400 is provided with an inclined first upper end face 401, a gap throttling is formed between the first upper end face 401 of the rotor end cover 400 and the lower end face of the pump cover 30. The space formed between the rotor end cover 400 and the lower end face of the pump cover 30 gradually expands from the center of the rotor 10 to both sides. The angle between the rotor end cover 400 and the lower end face of the pump cover 30 can be 1° to 20°, preferably 3° to 10°. At this time, in this space, at the outer periphery of the rotor end cover 400, that is, Figure 8 In the area at point A, the pressure in this area rises, and the rotor end cover 400 is subjected to a force that prevents the rotor 10 from floating further, thereby preventing the rotor 10 from floating further and contacting the lower end surface of the pump cover 30, thereby avoiding friction.

[0047] Preferably, the cross-sectional dimension of the liquid inlet is smaller than the cross-sectional dimension of the first flow channel 500 . In this case, the liquid entering the inlet can be prevented from impacting the rotor end cover 400 , thereby improving the stability of the rotor 10 .

[0048] In this application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or device comprising a list 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 further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the article or device comprising the element.

[0049] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional 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 that fall within the scope of the present application.

[0050] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if such changes and modifications of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such changes and modifications.

Claims

1. A centrifugal pump rotor, characterized in that: include: A rotor body, wherein a permanent magnet is disposed inside the rotor body; a rotating blade assembly, the rotating blade assembly being arranged on the rotor body; a rotor end cover, the rotor end cover being disposed on the rotating blade assembly; Among them, a first flow channel is provided at the center of the rotor end cover; a second flow channel is provided at the center of the rotating blade assembly, and multiple third flow channels are provided around the second flow channel; the first flow channel, the second flow channel and the third flow channel are connected to each other, so that the liquid entering the rotor from the first flow channel is pumped out through the second flow channel and the third flow channel to achieve the purpose of pumping liquid; the rotor end cover has a first upper end surface that is inclined.

2. The centrifugal pump rotor according to claim 1, wherein: The rotor end cover has a second upper end surface parallel to the radial direction at a center position, and the second upper end surface is connected to the first upper end surface.

3. The centrifugal pump rotor according to claim 1, wherein: The rotating blade assembly includes a plurality of blades that are spaced apart and spirally arranged in the same direction, and a plurality of spiral third flow channels are formed between the blades.

4. The centrifugal pump rotor according to claim 3, characterized in that: A blade gap is formed between the blade and the upper surface of the rotor body.

5. The centrifugal pump rotor according to claim 1, wherein: The radial dimension of the rotor end cover is greater than or equal to the radial dimension of the rotor body.

6. The centrifugal pump rotor according to claim 1, wherein: The radial dimension of the rotating blade assembly is greater than or equal to the radial dimension of the rotor end cover.

7. The centrifugal pump rotor according to claim 1, wherein: A fourth flow channel is provided at the center of the rotor body, and the fourth flow channel is interconnected with the second flow channel; a back blade is provided at the bottom of the rotor body, and the back blade is configured as a plurality of fifth flow channels diverging along the first flow channel toward the periphery of the rotor body.

8. The centrifugal pump rotor according to claim 7, characterized in that: The back blade includes eight fifth flow channels.

9. The centrifugal pump rotor according to claim 3, characterized in that: The rotating blade assembly includes four, five or six blades.

10. A centrifugal pump, characterized in that: It comprises a rotor as described in any one of claims 1 to 9, a pump cover, and a pump body, wherein the pump cover and the pump body are sealed to form a pump cavity, and the rotor is suspended and contactlessly arranged in the pump cavity; the space formed between the rotor and the pump cover gradually expands from the center of the rotor to both sides.

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