Centrifugal pump shell, centrifugal pump head and centrifugal pump

Abstract

The utility model provides a centrifugal pump casing, centrifugal pump head and centrifugal pump, the centrifugal pump casing comprises a first pump casing, a second end face of the first pump casing is provided with at least one arc-shaped groove, the opening of the arc-shaped groove faces a pump cavity, the arc-shaped groove is arranged with the center of the first pump casing as the circle center, and the arc-shaped groove is provided with an opening facing the pump cavity. Therefore, an arc-shaped flow channel for guiding fluid to move is formed in the liquid pumping process. The arc-shaped flow channels can reduce pressure fluctuation borne by the rotor and effectively adjust and optimize pressure distribution of an upper cover area of the rotor, so that the stress state of the upper cover of the rotor is improved, and the stability and reliability of rotor operation are remarkably improved. Furthermore, the arc-shaped groove can balance the acting force borne by the motor in the axial direction, reduce axial vibration and improve the working stability of the motor, so that the service life of the whole machine is prolonged, and the running safety and energy efficiency of the centrifugal pump are improved.

Description

Technical Field

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

[0002] During the rotation of a centrifugal pump rotor, the rotation of the rotor causes liquid to enter from the inlet of the centrifugal pump and flow out from the outlet. During the pumping process, the rotor is subjected to the force of the liquid, and the fluctuation of the force will cause uneven pressure distribution on the rotor cover, resulting in poor rotor rotation stability. At the same time, when the pressure distribution on the rotor cover is uneven, it will cause uneven axial force on the motor, resulting in poor axial stability of the motor. Utility Model Content

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

[0004] A first aspect of this application provides a centrifugal pump housing, including a first pump housing and a second pump housing that overlaps the first pump housing; the first pump housing and the second pump housing together enclose a pump cavity.

[0005] The first pump housing includes a first end face and a second end face opposite to the first end face; a pump inlet is formed on the first end face; at least one arc-shaped groove is formed on the second end face; the opening of the arc-shaped groove faces the pump cavity, and the center of the groove is the center of the first pump housing.

[0006] In some embodiments of this application, there are multiple arc-shaped grooves, which are interconnected to form an annular groove.

[0007] In some embodiments of this application, the arc-shaped grooves are in multiple sets; the multiple sets of arc-shaped grooves are arranged at radial intervals along the first pump casing.

[0008] In some embodiments of this application, the cross-sectional shape of the arc-shaped groove perpendicular to the direction of the first end face can be an arc, a rectangle, a trapezoid, a triangle, or a pentagon.

[0009] A second aspect of this application provides a centrifugal pump head, including the centrifugal pump casing and rotor described above; the rotor includes a rotor body, an impeller and a rotor cover; the impeller is disposed on the rotor body; the rotor cover is disposed on the impeller.

[0010] In some embodiments of this application, when there is one arc-shaped groove, the outer diameter of the arc-shaped groove is larger than the outer diameter of the rotor cover; the inner diameter of the arc-shaped groove is smaller than the outer diameter of the rotor cover.

[0011] In some embodiments of this application, the width of the arcuate groove on the second end face is between 8% and 16% of the diameter of the rotor cover.

[0012] In some embodiments of this application, the depth of the arcuate groove is between 5% and 16% of the diameter of the rotor cover.

[0013] In some embodiments of this application, the first pump housing further includes a third end face, which protrudes from the second end face toward the pump cavity.

[0014] A third aspect of this application provides a centrifugal pump, including the aforementioned centrifugal pump head and a motor, wherein the centrifugal pump head is disposed on the motor; and under the drive of the motor, the rotor is suspended and rotated in the pump chamber.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The centrifugal pump casing of the present application includes a first pump casing, and at least one arc-shaped groove with an opening facing the pump cavity is provided on the second end face of the first pump casing. The arc-shaped groove is arranged with the center of the first pump casing as the center, thereby forming an arc-shaped flow channel to guide the fluid movement during the pumping process. The arc-shaped flow channel can reduce the pressure fluctuation of the rotor, effectively regulate and optimize the pressure distribution in the rotor cover area, thereby improving the stress state of the rotor cover and significantly improving the stability and reliability of rotor operation. Furthermore, the arc-shaped groove can also balance the force borne by the motor axially, reduce axial vibration, improve the smoothness of motor operation, thereby extending the service life of the whole machine and improving the safety and energy efficiency of the centrifugal pump operation.

[0016] 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

[0017] 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:

[0018] Figure 1 This is a schematic diagram of the structure of a centrifugal pump head provided in an exemplary embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the first pump casing provided in an exemplary embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of the first pump casing provided in an exemplary embodiment of this application;

[0021] Figure 4This is a cross-sectional view of the first pump casing provided in an exemplary embodiment of this application;

[0022] Figure 5 This is a cross-sectional view of the first pump casing provided in an exemplary embodiment of this application;

[0023] Figure 6 This is a cross-sectional view of the first pump casing provided in an exemplary embodiment of this application;

[0024] Figure 7 This is a cross-sectional view of the first pump casing provided in an exemplary embodiment of this application;

[0025] Figure 8 This is a cross-sectional view of the first pump casing provided in an exemplary embodiment of this application;

[0026] Figure 9 This is a cross-sectional view of a centrifugal pump provided in an exemplary embodiment of this application;

[0027] Figure 10 This is a cross-sectional view of a centrifugal pump provided in an exemplary embodiment of this application.

[0028] In the picture:

[0029] 10. First pump casing; 20. Second pump casing; 30. Rotor;

[0030] 101. First end face; 102. Second end face; 103. Pump inlet; 104. Arc-shaped groove; 105. Third end face; 106. Fourth end face;

[0031] 301. Rotor body; 302. Impeller; 303. Rotor top cover. Detailed Implementation

[0032] 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.

[0033] During the rotation of a centrifugal pump rotor, the rotation of the rotor causes liquid to enter from the inlet of the centrifugal pump and flow out from the outlet. During the pumping process, the rotor is subjected to the force of the liquid, and the fluctuation of the force will cause uneven pressure distribution on the rotor cover, resulting in poor rotor rotation stability. At the same time, when the pressure distribution on the rotor cover is uneven, it will cause uneven axial force on the motor, resulting in poor axial stability of the motor.

[0034] Based on this, an exemplary embodiment of this application provides a centrifugal pump casing, which includes a first pump casing. At least one arc-shaped groove with an opening facing the pump cavity is provided on the second end face of the first pump casing. The arc-shaped groove is arranged with the center of the first pump casing as the center, thereby forming an arc-shaped flow channel to guide the fluid movement during the pumping process. The arc-shaped flow channel can reduce the pressure fluctuations on the rotor, effectively regulate and optimize the pressure distribution in the rotor cover area, thereby improving the stress state of the rotor cover and significantly improving the stability and reliability of rotor operation. Furthermore, the arc-shaped groove can also balance the axial force on the motor, reduce axial vibration, improve the smoothness of motor operation, thereby extending the service life of the whole machine and improving the safety and energy efficiency of centrifugal pump operation.

[0035] Example 1:

[0036] An exemplary embodiment of this application provides a centrifugal pump casing, such as... Figure 1 As shown, the centrifugal pump casing includes a first pump casing 10 and a second pump casing 20 that overlaps the first pump casing 10; the first pump casing 10 and the second pump casing 20 are sealed together, and the first pump casing 10 and the second pump casing 20 together enclose a pump cavity. Figures 2 to 4 As shown, the first pump housing 10 includes a first end face 101, a second end face 102 relative to the first end face 101, and a fourth end face 106 relative to the first end face 101 and surrounding the second end face 102. The fourth end face 106 is in sealing contact with the second pump housing 20. The first end face 101 protrudes away from the second end face 102 and forms a pump inlet 103, which penetrates the first pump housing 10 and communicates with the pump cavity. At least one arc-shaped groove 104 is formed on the second end face 102 surrounding the pump inlet 103; the opening of the arc-shaped groove 104 faces the pump cavity, and the center of the arc-shaped groove 104 is the center of the first pump housing 10.

[0037] The arc-shaped groove 104 is arranged with the center of the first pump casing 10 as the center, thereby forming an arc-shaped flow channel to guide the fluid movement during the pumping process. The arc-shaped flow channel can reduce the pressure fluctuation of the rotor 30, effectively regulate and optimize the pressure distribution in the area of ​​the rotor cover 303, thereby improving the stress state of the rotor cover 303 and significantly improving the stability and reliability of the rotor 30 operation. Furthermore, the arc-shaped groove 104 can also balance the force borne by the motor axially, reduce axial vibration, improve the smoothness of motor operation, thereby extending the service life of the whole machine and improving the safety and energy efficiency of the centrifugal pump operation.

[0038] Preferably, there are multiple arc-shaped grooves 104, and the multiple arc-shaped grooves 104 are interconnected, such as... Figure 3As shown, an annular groove is formed; this creates a continuous and uniformly distributed annular flow channel within the first pump casing 10, further optimizing the flow state and pressure distribution of the fluid inside the pump chamber; simultaneously, it ensures symmetrical and uniform force distribution in the rotor cover 303 area, improving the stability and reliability of rotor 30 operation. The annular flow channel increases the downward liquid force on the rotor cover 303, reducing the upward force on the rotor 30 while keeping the upward force on other parts of the rotor 30 constant. This lowers the rotor's axial stiffness requirement for the motor, avoiding the problem of insufficient axial stiffness in the centrifugal pump.

[0039] For example, the cross-sectional shape of the arc groove 104 perpendicular to the first end face 101 can be circular arc, rectangular, trapezoidal, triangular, or pentagonal; different cross-sectional shapes of the arc groove 104 can be matched according to different working conditions to adjust the flow characteristics of the fluid in the pump chamber. When the cross-sectional shape of the arc-shaped groove 104 is circular, the flow channel cross-section transitions smoothly, making it less prone to the accumulation of foreign matter at the corners. When the cross-sectional shape of the arc-shaped groove 104 is rectangular, it is easy to process and form, and the flow channel boundary is clear. When the flow rate inside the arc-shaped groove 104 is fixed, the depth of the rectangular cross-section arc-shaped groove 104 is shallow, and the thickness requirement of the first pump casing 10 is smaller. When the cross-sectional shape of the arc-shaped groove 104 is trapezoidal or triangular, it helps to enhance the local throttling effect and improve the ability to control axial force. At the same time, the trapezoidal and triangular cross-sectional shapes that gradually increase towards the pump cavity are conducive to making full use of the centrifugal force of the fluid inside the groove to enhance the exchange of fluid inside and outside the arc-shaped groove 104 and avoid the accumulation of foreign matter at the corners inside the arc-shaped groove 104. When the cross-sectional shape of the arc-shaped groove 104 is pentagonal or other polygonal, it can provide more complex flow guidance functions and is suitable for specific performance scenarios.

[0040] Example 2:

[0041] Based on Embodiment 1 above, the difference between this embodiment and Embodiment 1 is that, in this embodiment, as... Figure 5 As shown, there are multiple sets of arc-shaped grooves 104; these multiple sets of arc-shaped grooves 104 are arranged radially at intervals along the first pump casing 10. In this way, multiple sets of cooperating arc-shaped flow channels are formed within the first pump casing 10, thereby further optimizing the flow path and pressure distribution of the fluid inside the pump chamber, enhancing the ability to control the pressure distribution in the rotor cover 303 area, making the rotor 30 experience more uniform force during operation, and improving the guidance and stability of the fluid during pumping. This helps reduce fluid disturbance and energy loss, and improves the overall efficiency of the centrifugal pump.

[0042] Example 3:

[0043] Based on Embodiment 1 above, the difference between this embodiment and Embodiment 1 is that, in this embodiment, as... Figure 4 ,6 As shown in Figure 8, the first pump housing 10 also includes a third end face 105. The third end face 105 protrudes from the second end face 102 toward the pump cavity. Thus, when the rotor 30 floats, the distance between the third end face 105 and the rotor cover 303 decreases, and a throttling gap is formed between the rotor cover 303 and the third end face 105. The pressure at the outer periphery of the rotor cover 303 increases, and the rotor cover 303 is subjected to a force that prevents the rotor 30 from floating further. This prevents the rotor 30 from floating further and contacting the first pump housing 10, thus avoiding friction between the rotor 30 and the first pump housing 10.

[0044] Example 4:

[0045] An exemplary embodiment of this application provides a centrifugal pump head, which includes a centrifugal pump casing according to any one of embodiments 1 to 3 and a rotor 30. The rotor 30 includes a rotor body 301, an impeller 302 and a rotor cover 303. The impeller 302 is disposed on the rotor body 301. The rotor cover 303 is disposed on the impeller 302. The rotor 30 is capable of rotating and suspending in the pump chamber.

[0046] Preferably, when there is only one arc-shaped groove 104, the outer diameter of the arc-shaped groove 104 is larger than the outer diameter of the rotor cover 303; the inner diameter of the arc-shaped groove 104 is smaller than the outer diameter of the rotor cover 303. Since the pressure at the outer edge of the rotor cover 303 is the greatest when the rotor 30 rotates, when the outer diameter of the arc-shaped groove 104 is larger than the outer diameter of the rotor cover 303 and the inner diameter of the arc-shaped groove 104 is smaller than the outer diameter of the rotor cover 303, the fluid can be effectively guided to flow along the flow channel formed by the arc-shaped groove 104, improving the uniformity of pressure distribution at the edge of the rotor cover 303, enhancing the operational stability and reliability of the rotor 30, and strengthening the axial self-balancing ability of the centrifugal pump under varying operating conditions.

[0047] On the second end face 102, the width of the arc-shaped groove 104 is between 8% and 16% of the diameter of the rotor cover 303. When the width of the arc-shaped groove 104 is too small, such as less than 8% of the diameter of the rotor cover 303, the arc-shaped groove 104 is difficult to form an effective fluid guiding effect and is inconvenient to process; while when the width of the arc-shaped groove 104 is too large, such as exceeding 16% of the diameter of the rotor cover 303, it will lead to enhanced fluid backflow and reduce the efficiency of the centrifugal pump. In this application, the width of the arc-shaped groove 104 is set within the above-mentioned preferred range, which can not only give full play to its optimization effect on the flow field, but also take into account the requirements of manufacturing process and structural strength.

[0048] The depth of the arc-shaped groove 104 is between 5% and 16% of the diameter of the rotor cover 303. When the depth of the arc-shaped groove 104 is too shallow, such as less than 5% of the diameter of the rotor cover 303, it is difficult for the arc-shaped groove 104 to form an effective fluid guiding path, resulting in weak pressure distribution regulation capability. Conversely, when the depth of the arc-shaped groove 104 is too deep, such as exceeding 16% of the diameter of the rotor cover 303, it can lead to local flow turbulence and increase energy loss. In this application, setting the depth of the arc-shaped groove 104 between 5% and 16% of the diameter of the rotor cover 303 can form an effective fluid guiding path, optimize the pressure on the rotor cover 303, and improve the stability of the rotor 30.

[0049] Example 5:

[0050] An exemplary embodiment of this application provides a centrifugal pump, which includes a centrifugal pump head and a motor as described in Embodiment 4; the centrifugal pump head is disposed on the motor; under the drive of the motor, the rotor 30 can suspend and rotate in the pump chamber.

[0051] 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.

[0052] 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.

[0053] 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 casing characterized in that, The centrifugal pump comprises a first pump shell and a second pump shell which is mutually covered with the first pump shell; the first pump shell and the second pump shell jointly enclose a pump cavity; The first pump shell comprises a first end face and a second end face opposite to the first end face; the first end face is provided with a pump inlet; the second end face is provided with at least one arc-shaped groove; the arc-shaped groove is open towards the pump cavity, and the center of the arc-shaped groove is the center of the first pump shell.

2. The centrifugal pump housing of claim 1, wherein, The arc-shaped grooves are multiple, and the multiple arc-shaped grooves are mutually connected to form an annular groove.

3. The centrifugal pump housing of claim 1, wherein, The arc-shaped grooves are multiple groups; the multiple groups of arc-shaped grooves are arranged in a radial direction of the first pump shell.

4. The centrifugal pump housing of claim 1, wherein, The cross-sectional shape of the arc-shaped groove perpendicular to the direction of the first end face can be a circular arc, a rectangle, a trapezoid, a triangle or a pentagon.

5. A centrifugal pump head, characterized by The centrifugal pump comprises a first pump shell and a second pump shell which is mutually covered with the first pump shell; the first pump shell and the second pump shell jointly enclose a pump cavity; 6. The centrifugal pump impeller of claim 5, wherein, When the arc-shaped groove is one, the outer diameter of the arc-shaped groove is greater than the outer diameter of the rotor cover; the inner diameter of the arc-shaped groove is smaller than the outer diameter of the rotor cover.

7. The centrifugal pump impeller of claim 5, wherein, On the second end face, the width dimension of the arc-shaped groove is between 8% and 16% of the diameter dimension of the rotor cover.

8. The centrifugal pump impeller of claim 5, wherein, The depth dimension of the arc-shaped groove is between 5% and 16% of the diameter dimension of the rotor cover.

9. The centrifugal pump impeller of claim 5, wherein, The first pump shell further comprises a third end face which is arranged protruding from the second end face towards the pump cavity.

10. A centrifugal pump characterized by The centrifugal pump comprises a first pump shell and a second pump shell which is mutually covered with the first pump shell; the first pump shell and the second pump shell jointly enclose a pump cavity; Under the driving of the motor, the rotor is suspended and rotated in the pump cavity.

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