A centrifugal pump rotor, a pump head and a centrifugal pump

Abstract

The utility model provides a kind of centrifugal pump rotor, pump head and centrifugal pump, the centrifugal pump rotor is set up by center cover and vice blade, negative pressure area can be generated in the rotation process of vice blade, and then the suction force of fluid in the bottom of centrifugal pump rotor can be generated, the flow of fluid passing through balance hole is controlled, and then the pressure distribution of the bottom of centrifugal pump rotor can be controlled, the axial displacement of centrifugal pump rotor is controlled;At the same time, the setting vice blade can not only avoid the radial embedding of center cover in blade, avoid the blockage of center cover between two blade outlet flow channel, but also can enhance the structural strength of center cover.

Description

Technical Field

[0001] This application relates to the field of centrifugal pump technology, and in particular to a centrifugal pump rotor, pump head and centrifugal pump. Background Technology

[0002] When the rotor of a magnetic levitation pump operates at high speed, the liquid in the gap between the lower end cover of the rotor and the pump housing easily forms a high-pressure zone, resulting in a significant increase in axial force and affecting the rotor's suspension stability. In existing technologies, some solutions employ a back vane structure to reduce pressure, with the flow channel of the back vane connecting to the balance hole and extending through to the side wall of the rotor body. However, the flow rate through the balance hole towards the vane and the fluid entering the rotor from the top create convective impacts, leading to turbulent flow and affecting the rotor's operational stability. Simultaneously, the uncontrollable flow rate through the balance hole towards the vane results in uncontrollable pressure distribution at the bottom of the centrifugal pump rotor. Utility Model Content

[0003] To address the aforementioned technical problems, this application provides a centrifugal pump rotor, a pump head, and a centrifugal pump.

[0004] A first aspect of this application provides a centrifugal pump rotor, the centrifugal pump rotor being rotatable about an axis A, the centrifugal pump rotor comprising: The rotor body has a balance hole that runs through it in the axial direction; and a magnetic core is provided around the balance hole. Multiple blades are arranged around the balance hole on the upper part of the rotor body, and an outlet flow channel for fluid to flow out is formed between every two blades; The upper end cap is located on the upper part of the blade, and an inlet channel for liquid to flow in is formed in the center; The lower end cover is located at the lower part of the rotor body; The center cover plate is disposed within the space formed by multiple blades and is connected at the bottom to the upper surface of the rotor body; Multiple auxiliary blades are arranged around the rotation axis between the central cover plate and the rotor body.

[0005] In some embodiments of this application, there are multiple balance holes, which are evenly distributed around the rotation axis; the auxiliary blade is disposed between two balance holes.

[0006] In some embodiments of this application, the auxiliary blade is either a straight auxiliary blade extending radially or a curved auxiliary blade with the same rotation direction as the blade.

[0007] In some embodiments of this application, the outer circle diameter of multiple auxiliary blades is greater than or equal to the outer circle diameter of the balance hole.

[0008] In some embodiments of this application, the outer diameter of the center cover plate is larger than the circumcircle diameter of the balance hole, but smaller than the diameter of the inlet channel of the upper cover.

[0009] In some embodiments of this application, the surface of the lower end cover is formed with a plurality of turbulence grooves arranged around the balance hole.

[0010] In some embodiments of this application, the cross-sectional shape of the turbulence channel in the radial direction is a closed shape; the shape includes a first end line near axis A, a second end line near the side wall of the lower end cover, and a connecting line connecting the first end line and the second end line; the first end line, the second end line, and the connecting line are all constructed from one or more straight lines or curves.

[0011] In some embodiments of this application, one end of the turbulence groove extends towards the side wall of the lower end cover, and the distance between the groove and the side wall of the lower end cover is L, where L>0.

[0012] In some embodiments of this application, the other end of the turbulence groove extends toward the balance hole, and the ends of the multiple turbulence grooves near the balance hole are interconnected.

[0013] In some embodiments of this application, the turbulence channels are in multiple groups, and the multiple groups of turbulence channels are arranged concentrically; each group includes multiple turbulence channels evenly distributed along the circumference.

[0014] In some embodiments of this application, the depth of the turbulence groove is 0.3 mm to 2 mm.

[0015] A second aspect of this application provides a pump head, including the aforementioned centrifugal pump rotor and pump housing; the pump housing has a fluid inlet and a fluid outlet, and an internal pump cavity; the centrifugal pump rotor is suspended and non-contactly disposed within the pump cavity. A third aspect of this application provides a centrifugal pump, including the pump head and motor described above; the pump head is disposed on the motor, and the motor is capable of generating magnetic drive to drive the centrifugal pump rotor to rotate about axis A in a contactless manner.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: The centrifugal pump rotor, pump head and centrifugal pump of this application, by setting a central cover plate and setting auxiliary blades between the central cover plate and the rotor body, can generate a negative pressure area during the rotation of the auxiliary blades, thereby generating a suction force on the fluid at the bottom of the centrifugal pump rotor, controlling the flow rate of the fluid through the balance hole, thereby controlling the pressure distribution at the bottom of the centrifugal pump rotor and controlling the axial displacement of the centrifugal pump rotor; at the same time, setting auxiliary blades to support the central cover plate can not only prevent the central cover plate from radially embedding into the blades and prevent the central cover plate from blocking the outlet flow channel between the two blades, but also enhance the structural strength of the central cover plate.

[0017] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0018] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a cross-sectional view of a centrifugal pump rotor provided in an exemplary embodiment of this application; Figure 2 This is a front view of a centrifugal pump rotor provided in an exemplary embodiment of this application; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 yes Figure 2 Sectional view at point BB; Figure 5 This is a bottom view of a centrifugal pump rotor provided in an exemplary embodiment of this application; Figure 6 This is a front view of a centrifugal pump rotor provided in an exemplary embodiment of this application; Figure 7 yes Figure 6 Sectional view at CC; Figure 8 yes Figure 6 Sectional view at point DD; Figure 9 This is a bottom view of a centrifugal pump rotor provided in an exemplary embodiment of this application; Figure 10 This is a bottom view of a centrifugal pump rotor provided in an exemplary embodiment of this application; Figure 11 This is a bottom view of a centrifugal pump rotor provided in an exemplary embodiment of this application; Figure 12 This is a bottom view of a centrifugal pump rotor provided in an exemplary embodiment of this application; Figure 13 This is a cross-sectional view of a pump head provided in an exemplary embodiment of this application.

[0019] In the picture: 10. Centrifugal pump rotor; 20. Pump casing; 101. Rotor body; 102. Balance hole; 103. Magnetic effective core; 104. Blade; 105. Upper end cover; 106. Inlet flow channel; 107. Lower end cover; 108. Turbulence groove; 109. Center cover plate; 110. Secondary blade; 201. Fluid inlet; 202. Fluid outlet; 203. Pump chamber. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0021] When the rotor of a magnetic levitation pump operates at high speed, the liquid in the gap between the lower end cover of the rotor and the pump housing easily forms a high-pressure zone, resulting in a significant increase in axial force and affecting the rotor's suspension stability. In existing technologies, some solutions employ a back vane structure to reduce pressure, with the flow channel of the back vane connecting to the balance hole and extending through to the side wall of the rotor body. However, the flow rate through the balance hole towards the vane and the fluid entering the rotor from the top create convective impacts, leading to turbulent flow and affecting the rotor's operational stability. Simultaneously, the uncontrollable flow rate through the balance hole towards the vane results in uncontrollable pressure distribution at the bottom of the centrifugal pump rotor.

[0022] Based on this, an exemplary embodiment of this application provides a centrifugal pump rotor, pump head, and centrifugal pump. By setting a central cover plate and setting auxiliary blades between the central cover plate and the rotor body, the auxiliary blades can generate a negative pressure area during rotation, thereby generating a suction force on the fluid at the bottom of the centrifugal pump rotor, controlling the flow rate of the fluid through the balance hole, and thus controlling the pressure distribution at the bottom of the centrifugal pump rotor and controlling the axial displacement of the centrifugal pump rotor. At the same time, setting auxiliary blades to support the central cover plate can not only prevent the central cover plate from radially embedding into the blades and prevent the central cover plate from blocking the outlet flow channel between the two blades, but also enhance the structural strength of the central cover plate.

[0023] Example 1: An exemplary embodiment of this application provides a centrifugal pump rotor, which is rotatable about axis A, such as... Figures 1 to 5 As shown, the centrifugal pump rotor includes: a rotor body 101, and a balance hole 102 forming inside the rotor body 101 in the axial direction; the balance hole 102 can have various forms, such as... Figures 1 to 9 As shown, there are multiple balancing holes 102, which are evenly distributed around axis A; as Figure 10 and 11As shown, there is one balancing hole 102, located at the center of the rotor body 101. A magnetic active core 103 is disposed inside the rotor body 101 surrounding the balancing hole 102. The magnetic active core 103 can be a permanent magnet or a soft magnetic material. Multiple blades 104 are disposed around the balancing hole 102 on the upper part of the rotor body 101, with an outlet channel for fluid flow formed between every two blades 104. An upper end cover 105 is disposed on the upper part of the blades 104, with an inlet channel 106 for liquid inflow formed at its center. A lower end cover 107 is disposed on the lower part of the rotor body 101. A central cover plate 109 is disposed within the space enclosed by the multiple blades 104, and its lower part is connected to the upper surface of the rotor body 101. Multiple auxiliary blades 110 are disposed around the rotation axis between the central cover plate 109 and the rotor body 101.

[0024] During operation, the centrifugal pump rotor rotates around axis A. Fluid enters the interior of the centrifugal pump rotor through the inlet channel 106 of the upper end cover 105, flows out through the outlet channel between the two blades 104, and then flows out through the fluid outlet 202 on the pump housing 20. Part of the fluid flows through the gap between the centrifugal pump rotor and the pump housing 20 to the bottom of the centrifugal pump rotor, and continues to flow upward through the balance hole 102 to the outlet channel between the two blades 104. During this process, the lower end cover 107 of the centrifugal pump rotor is under pressure, especially near the side wall of the lower end cover 107, where the pressure is greatest, forming a high-pressure zone. This leads to an increase in axial force, affecting the stress stability and operational stability of the centrifugal pump rotor.

[0025] In this application, by setting a central cover plate 109 and an auxiliary blade 110 between the central cover plate 109 and the rotor body 101, the auxiliary blade 110 can generate a negative pressure area during rotation, thereby generating a suction force on the fluid at the bottom of the centrifugal pump rotor, controlling the flow rate of the fluid through the balance hole 102, and thus controlling the pressure distribution at the bottom of the centrifugal pump rotor and the axial displacement of the centrifugal pump rotor. At the same time, setting the auxiliary blade 110 to support the central cover plate 109 can enhance the structural strength of the central cover plate 109. If the central cover plate 109 is radially embedded in the blade 104, while maintaining the same flow rate, the blade 104 needs to have a larger size in the axial direction, which will increase the size of the centrifugal pump rotor in the axial direction and affect the operating stability of the centrifugal pump rotor. In this application, an auxiliary blade 110 is provided below the center cover plate 109. This does not require the auxiliary blade 110 to extend radially onto the blade 104, but it can still increase the structural strength of the center cover plate 109 and prevent the center cover plate 109 from blocking the outlet flow channel between the two blades 104. While maintaining the same flow rate, the blade 104 has a smaller axial dimension, which can improve the operating stability of the centrifugal pump rotor.

[0026] When there are multiple balancing holes 102, the multiple balancing holes 102 are evenly distributed around the rotation axis; for example... Figure 4 As shown in Figure 8, the auxiliary blades 110 are disposed between the two balancing holes 102. The number of auxiliary blades 110 can be matched with or less than the number of balancing holes 102. Depending on the suction capacity at the bottom of the centrifugal pump rotor, different numbers of auxiliary blades 110 can be provided; the more auxiliary blades 110 there are, the stronger the suction capacity. Preferably, the number of auxiliary blades 110 is greater than or equal to three, and they are evenly distributed radially.

[0027] The shape of the secondary blade 110 can be selected in various ways, for example, such as Figure 4 As shown in Figure 8, the secondary blade 110 can be a straight secondary blade 110 extending radially, or it can be a curved secondary blade 110 with the same rotation direction as the blade 104. At the same rotational speed, when a greater suction capacity is required, the straight secondary blade 110 is preferred, and if a smaller suction capacity is required, the curved secondary blade 110 is preferred.

[0028] Preferred, such as Figure 4 As shown in Figure 8, the outer circle diameter d3 of the multiple auxiliary blades 110 is greater than or equal to the outer circle diameter of the balance hole 102. This prevents the liquid drawn from the bottom of the centrifugal pump rotor from continuing to flow towards the inlet channel 106 and impacting the fluid entering the centrifugal pump rotor from the inlet channel 106, thus avoiding instability in the operation of the centrifugal pump rotor.

[0029] The outer diameter of the center cover plate 109 is larger than the outer circle diameter of the balance hole 102 and smaller than the diameter of the inlet flow channel 106 of the upper end cover 105. This not only avoids the impact between the pumped liquid and the fluid entering the centrifugal pump rotor from the inlet flow channel 106, thus preventing the centrifugal pump rotor from running unstablely, but also prevents the center cover plate 109 from blocking the outlet flow channel between the two blades 104, thereby improving the stability of the centrifugal pump rotor movement.

[0030] Example 2: Based on Example 1, the main difference between the centrifugal pump rotor provided in this embodiment and the centrifugal pump rotor in Example 1 is that, in this embodiment, as... Figure 1 As shown in Figures 3 or 5, the surface of the lower end cover 107 is formed with a plurality of turbulence grooves 108 arranged around the balance hole 102. In this embodiment, the turbulence grooves 108 are provided on the lower end cover 107. During the rotation of the centrifugal pump rotor, the turbulence grooves 108 can form vortices, thereby forming a controllable low-pressure vortex zone. This can effectively reduce the liquid pressure at the bottom of the centrifugal pump rotor, reduce the axial force of the centrifugal pump rotor, stabilize the centrifugal pump rotor in the axial direction, and improve the motion stability of the centrifugal pump rotor.

[0031] The cross-sectional shape of the turbulence channel 108 in the radial direction can be chosen in various ways, and it is a closed shape. This shape includes a first end line near axis A, a second end line near the side wall of the lower end cover 107, and a connecting line connecting the first and second end lines. The first end line, the second end line, and the connecting line are all constructed from one or more straight lines or curves. For example, the first end line, the second end line, and the connecting line are all straight lines, or the first end line, the second end line, and the connecting line are all curves. Alternatively, the first end line and the second end line are curves, and the connecting line is a straight line. Preferably, it can be one of a rectangle, an ellipse, or a circle. Figure 5 , Figures 9 to 11 The centrifugal pump rotor shown has an elliptical cross-sectional shape for the turbulence groove 108 in the radial direction. The long side of the turbulence groove 108 can generate stable vortices, effectively reducing the liquid pressure at the bottom of the centrifugal pump rotor; Figure 12 The centrifugal pump rotor shown has a circular cross-sectional shape of the turbulence groove 108 in the radial direction. The isotropic structure generates a symmetrical low-pressure area, and the force distribution of the centrifugal pump rotor is more uniform.

[0032] Preferably, one end of the turbulence groove 108 extends towards the side wall of the lower end cover 107, and the distance between it and the side wall of the lower end cover 107 is L, where L>0. That is, as shown... Figure 9 As shown, the diameter d1 of the circumscribed circle of the turbulence groove 108 is smaller than the outer diameter d2 of the rotor body 101; thus, one end of the turbulence groove 108 is not through and maintains a preset distance from the side wall of the lower end cover 107, so that no convection is generated from the balance hole 102 to the side wall of the rotor body 101, which can avoid the impact of the jet generated by the back blade, reduce the pressure fluctuation in the pump cavity, improve the stress stability of the centrifugal pump rotor, and enhance the motion stability of the centrifugal pump rotor.

[0033] The other end of the turbulence groove 108 extends toward the balance hole 102, preferably, as shown below. Figure 11 As shown, multiple turbulence grooves 108 are interconnected at one end near the balance hole 102. At this time, a flow channel connecting the multiple turbulence grooves 108 can be set around the balance hole 102. The outer diameter of the flow channel is smaller than the diameter of the circumscribed circle of the turbulence groove 108 and larger than the diameter of the balance hole 102. In this way, the distance between two turbulence grooves 108 near the balance hole 102 can be prevented from being too small, thereby improving the processing convenience of the turbulence grooves 108 and the overall structural strength of the centrifugal pump rotor.

[0034] Preferably, in this application, the depth of the turbulence groove 108 is 0.3 mm to 2 mm. This avoids the turbulence groove 108 being too shallow to generate effective eddies, or too deep to cause excessive disturbance.

[0035] Example 3: Based on Example 2, the main difference between the centrifugal pump rotor provided in this embodiment and the centrifugal pump rotor in Example 2 is that, in this embodiment, as... Figure 10 As shown, there are multiple sets of turbulence channels 108, arranged concentrically. Each set includes multiple turbulence channels 108 evenly distributed along the circumference. Adjacent sets of turbulence channels 108 are staggered in the radial direction, thus generating multi-stage pressure attenuation at the bottom of the centrifugal pump rotor, resulting in a smoother pressure distribution at the rotor's bottom. Adjacent sets of turbulence channels 108 are aligned radially, forming a superimposed vortex field that disturbs the bottom of the centrifugal pump rotor, reducing the liquid pressure at the rotor's bottom.

[0036] Example 4: An exemplary embodiment of this application provides a pump head, such as Figure 13 As shown, the pump head of this embodiment includes a centrifugal pump rotor 10 and a pump housing 20 as described in any one of embodiments 1 to 3; a fluid inlet 201 and a fluid outlet 202 are formed on the pump housing 20, and a pump chamber 203 is formed inside; the centrifugal pump rotor 10 is suspended and disposed in the pump chamber 203 without contact. The centrifugal pump rotor 10 rotates about axis A, which allows fluid to enter the interior of the centrifugal pump rotor from the fluid inlet 201 through the inlet flow channel 106 of the upper end cover 105, and flow out from the outlet flow channel between the two blades 104, and then flow out through the fluid outlet 202.

[0037] Example 5: An exemplary embodiment of this application provides a centrifugal pump, including the pump head and motor described in embodiment 4; the pump head is disposed on the motor, and the motor is capable of generating magnetic drive to drive the centrifugal pump rotor 10 to rotate about axis A in a non-contact manner.

[0038] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0039] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0040] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and variations.

Claims

1. A centrifugal pump rotor, characterized in that, The centrifugal pump rotor is rotatable about axis A, and the centrifugal pump rotor includes: The rotor body (101) has a balance hole (102) that runs through the rotor body (101) in the axial direction; and a magnetic effective core (103) is provided around the balance hole (102). Multiple blades (104) are arranged around the balance hole (102) on the upper part of the rotor body (101), and an outlet flow channel for fluid to flow out is formed between every two blades (104); The upper end cap (105) is disposed on the upper part of the blade (104), and an inlet channel (106) for liquid to flow in is formed in the center. The lower end cover (107) is disposed at the lower part of the rotor body (101); The center cover plate (109) is disposed within the space formed by the multiple blades (104) and its lower part is connected to the upper surface of the rotor body (101); Multiple auxiliary blades (110) are arranged around the rotation axis between the central cover plate (109) and the rotor body (101).

2. The centrifugal pump rotor according to claim 1, characterized in that, There are multiple balance holes (102), and the multiple balance holes (102) are evenly distributed around the rotation axis; the auxiliary blade (110) is disposed between two balance holes (102).

3. The centrifugal pump rotor according to claim 1, characterized in that, The secondary blade (110) is either a straight secondary blade (110) extending radially or a curved secondary blade (110) with the same rotation direction as the blade (104).

4. The centrifugal pump rotor according to claim 1, characterized in that, The circumcircle diameter of multiple auxiliary blades (110) is greater than or equal to the circumcircle diameter of the balance hole (102).

5. The centrifugal pump rotor according to claim 1, characterized in that, The outer diameter of the center cover plate (109) is larger than the outer circle diameter of the balance hole (102) and smaller than the diameter of the inlet channel (106) of the upper end cover (105).

6. The centrifugal pump rotor according to claim 1, characterized in that, The surface of the lower end cap (107) is formed with a plurality of turbulence grooves (108) arranged around the balance hole (102).

7. The centrifugal pump rotor according to claim 6, characterized in that, The cross-sectional shape of the turbulence groove (108) in the radial direction is a closed shape; the shape includes a first end line near axis A, a second end line near the side wall of the lower end cover (107) and a connecting line connecting the first end line and the second end line; the first end line, the second end line and the connecting line are all constructed from one or more straight lines or curves.

8. The centrifugal pump rotor according to claim 6, characterized in that, One end of the turbulence groove (108) extends towards the side wall of the lower end cover (107), and the distance between it and the side wall of the lower end cover (107) is L, where L>0.

9. The centrifugal pump rotor according to claim 8, characterized in that, The other end of the turbulence groove (108) extends toward the balance hole (102), and the ends of the multiple turbulence grooves (108) near the balance hole (102) are interconnected.

10. The centrifugal pump rotor according to claim 6, characterized in that, The turbulence channels (108) are in multiple groups, and the multiple groups of turbulence channels (108) are arranged concentrically; each group includes multiple turbulence channels (108) evenly distributed along the circumference.

11. The centrifugal pump rotor according to any one of claims 6 to 10, characterized in that, The depth of the turbulence groove (108) is 0.3 mm to 2 mm.

12. A pump head, characterized in that, Includes a centrifugal pump rotor (10) as described in any one of claims 1 to 11 and a pump housing (20); the pump housing (20) has a fluid inlet (201) and a fluid outlet (202) formed thereon, and a pump chamber (203) formed inside; the centrifugal pump rotor (10) is suspended and disposed in the pump chamber (203) without contact.

13. A centrifugal pump, characterized in that, It includes the pump head as described in claim 12 and the motor; the pump head is disposed on the motor, and the motor is capable of generating magnetic drive to drive the centrifugal pump rotor to rotate about axis A in a non-contact manner.

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