Pump cover and centrifugal pump

Abstract

The pump cover comprises a pump cover body and a pump inlet portion which are integrally formed, the lower end face of the pump cover body is provided with a central high point and a peripheral low point, and the lower end face inclines from the central high point to the peripheral low point to form a conical face with the central portion higher than the edge portion. Thus, when the rotor is driven in a magnetic non-contact mode and is in a suspension state, a gap for throttling is formed between the upper end face of the rotor end cover and the lower end face of the pump cover body, at the moment, the pressure on the periphery of the rotor end cover rises, and the rotor end cover bears the acting force for preventing the rotor from further floating upwards; therefore, the rotor can be prevented from further floating to 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 pump cover 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 lower end surface of the pump cover, resulting in a certain amount of friction. This friction not only causes wear of the rotor and the lower end surface 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 pump cover and a centrifugal pump.

[0005] In a first aspect of the present application, a pump cover is provided, comprising an integrally formed pump cover body and a pump inlet portion; the pump inlet portion is arranged at the top of the pump cover body, and a through pump inlet is provided on the pump cover body and the pump inlet portion; the lower end surface of the pump cover body has a central high point and a peripheral low point, and the lower end surface is inclined from the central high point to the peripheral low point to form a conical surface with the central portion being higher than the edge portion.

[0006] In some embodiments of the present application, the lower end surface of the pump cover body has a pump cover boss or a pump cover plane arranged around the pump inlet, and a conical surface inclined from the pump cover boss or the pump cover plane to the peripheral low point.

[0007] In some embodiments of the present application, a first groove surrounding the pump inlet is provided on the top of the pump cover body.

[0008] In some embodiments of the present application, the lower end surface of the pump cover body is provided with a second groove surrounding the pump cover boss or the pump cover plane.

[0009] In some embodiments of the present application, a connecting thread is provided on the outer peripheral surface of the pump inlet.

[0010] In some embodiments of the present application, the inclination angle of the tapered surface is between 1° and 10°.

[0011] In some embodiments of the present application, the pump cover body is provided with a plurality of mounting holes arranged at equal intervals along the circumferential direction.

[0012] In a second aspect of the present application, a pump cover is provided, comprising an integrally formed pump cover body and a pump inlet portion; the pump inlet portion is arranged at the top of the pump cover body, and a through pump inlet is provided on the pump cover body and the pump inlet portion; the lower end surface of the pump cover body has a pump cover boss arranged around the pump inlet.

[0013] A third aspect of the present application provides a centrifugal pump, comprising a pump cover, a pump body, and a rotor. 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.

[0014] In some embodiments of the present application, the space formed between the rotor and the pump cover gradually expands from the center of the rotor to both sides.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The pump cover of the present application includes an integrally formed pump cover body and a pump inlet portion. The lower end surface of the pump cover body has a central high point and peripheral low points. The lower end surface tilts from the central high point to the peripheral low points to form a tapered surface with the central portion higher than the edge portion. In this way, when the rotor is driven in a magnetic non-contact manner and is in a suspended state, a gap throttling is formed between the upper end surface of the rotor end cover and the lower end surface of the pump cover body. 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.

[0016] 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

[0017] 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:

[0018] Figure 1 is a cross-sectional view of a pump cover provided by an exemplary embodiment of the present application;

[0019] Figure 2 is a cross-sectional view of a pump cover provided by an exemplary embodiment of the present application;

[0020] Figure 3 is a cross-sectional view of a pump cover provided by an exemplary embodiment of the present application;

[0021] Figure 4 is a cross-sectional view of a pump cover provided by an exemplary embodiment of the present application;

[0022] Figure 5 is a cross-sectional view of a pump cover provided by an exemplary embodiment of the present application;

[0023] Figure 6 is a cross-sectional view of a pump cover provided by an exemplary embodiment of the present application;

[0024] Figure 7 is a cross-sectional view of a pump cover provided by an exemplary embodiment of the present application;

[0025] Figure 8 1 is a schematic structural diagram of a pump cover provided by an exemplary embodiment of the present application;

[0026] Figure 9 is a structural schematic diagram of a centrifugal pump provided by an exemplary embodiment of the present application;

[0027] Figure 10 is a structural schematic diagram of a centrifugal pump provided by an exemplary embodiment of the present application;

[0028] Figure 11 is a structural schematic diagram of a centrifugal pump provided by an exemplary embodiment of the present application;

[0029] Figure 12 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. Pump cover; 20. Pump body; 30. Rotor;

[0032] 101. Pump cover body; 1011. Center high point; 1012. Low points on both sides; 102. Pump inlet; 103. Pump inlet; 104. Pump cover boss; 105. Pump cover plane; 106. First groove; 107. Connecting thread; 108. Second groove; 109. Mounting hole. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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 lower end surface of the pump cover, resulting in a certain amount of friction. This friction not only causes wear of the rotor and the lower end surface of the pump cover, but also the particles that may be generated during the friction process will contaminate the liquid being transported.

[0036] Based on this, an exemplary embodiment of the present application provides a pump cover, which includes an integrally formed pump cover body and a pump inlet portion. The lower end surface of the pump cover body has a central high point and a peripheral low point. The lower end surface tilts from the central high point to the peripheral low point to form a conical surface with the central portion higher than the edge portion. In this way, when the rotor is driven in a magnetic non-contact manner and is in a suspended state, a gap throttling will be formed between the upper end surface of the rotor end cover and the lower end surface of the pump cover body. 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.

[0037] Example 1:

[0038] An exemplary embodiment of the present application provides a pump cover, such as Figure 1 As shown, the pump cover includes an integrally formed pump cover body 101 and a pump inlet portion 102; the pump inlet portion 102 is arranged at the top of the pump cover body 101, and a through pump inlet 103 is provided on the pump cover body 101 and the pump inlet portion 102; in order to prevent the lower end face of the pump cover body 101 from contacting the upper end face of the rotor end cover with the lower end face of the pump cover body 101, the lower end face of the pump cover body 101 has a central high point 1011 and a peripheral low point 1012, and the lower end face is inclined from the central high point 1011 to the peripheral low point 1012 to form a conical surface with the central portion higher than the edge portion. The central high point 1011 can be arranged around the pump inlet 103. At this time, the lower end face of the pump cover body 101 starts to incline from the pump inlet 103 to the peripheral low point 1012, as shown in FIG. Figure 9 As described above, when the rotor is driven in a magnetic non-contact manner and is in a suspended state, a gap throttling will be formed between the lower end surface of the pump cover body 101 and the upper end surface of the rotor end cover. During the operation of the rotor, the center of the rotor is a low-pressure area and the periphery of the rotor is a high-pressure area. In this way, the pressure at the periphery of the rotor end cover rises, that is, the pressure in the area A in the figure 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 lower end surface of the pump cover, and avoiding friction between the rotor end cover and the lower end surface of the pump cover.

[0039] The inclination angle of the conical surface is between 1° and 10°. Preferably, in order to prevent friction between the rotor end cover and the lower end surface of the pump cover and to maintain an appropriate angle between the rotor end cover and the lower end surface of the pump cover, the optimal inclination angle of the conical surface is between 3° and 5°. Figure 8As shown, a connecting thread 107 is provided on the outer circumference of the pump inlet portion 102 to facilitate connection with external equipment. The pump cover body 101 is provided with multiple mounting holes 109 arranged at equal intervals along the circumferential direction to facilitate connection and fixation between the pump cover and the pump body.

[0040] Example 2:

[0041] On the basis of the above embodiment 1, Figure 2 As shown, a first groove 106 surrounding the pump inlet portion 102 is provided on the top of the pump cover body 101 so that the pump cover body 101 maintains a uniform thickness to reduce stress concentration and extend the service life of the pump cover.

[0042] Example 3:

[0043] On the basis of the above embodiment 1 or embodiment 2, Figure 3 As shown, the lower end surface of the pump cover body 101 has a pump cover boss 104 arranged around the pump inlet 103, and a tapered surface inclined from the pump cover boss 104 to the peripheral low point 1012. Figure 10 As shown, a gap throttling is formed between the bottom end surface of the pump cover boss 104 and the rotor end cover, and a high-pressure area is formed between the conical surface and the outer peripheral surface of the rotor end cover. That is, the pressure in area A in the figure rises, and the pressure at the periphery of the rotor end cover rises. 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 lower end surface of the pump cover, and avoiding friction between the rotor end cover and the lower end surface of the pump cover.

[0044] Example 4:

[0045] On the basis of the above embodiment 1 or embodiment 2, Figure 4 and 5 As shown, the lower end surface of the pump cover body 101 has a pump cover plane 105 arranged around the pump inlet 103, and a tapered surface that slopes from the pump cover plane 105 toward the peripheral low point 1012. In this case, the central high point 1011 is located at the outer edge of the pump cover plane 105, and the tapered surface slopes from the outer edge of the pump cover plane 105 toward the peripheral low point 1012 to form a tapered surface. A throttling gap is formed between the pump cover plane 105 and the rotor end cover. The pressure in the area between the tapered surface and the rotor end cover is higher, and the pressure at the outer periphery of the rotor end cover rises. 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 lower end surface of the pump cover, and preventing friction between the rotor end cover and the lower end surface of the pump cover.

[0046] Example 5:

[0047] In order to make the thickness of the pump cover body 101 more uniform and reduce stress concentration on the pump cover body 101 , the lower end surface of the pump cover body 101 may further be provided with a second groove 108 surrounding the pump cover boss 104 or the pump cover plane 105 .

[0048] Example 6:

[0049] An exemplary embodiment of the present application provides a pump cover, such as Figure 6 As shown, the pump cover includes an integrally formed pump cover body 101 and a pump inlet portion 102; the pump inlet portion 102 is arranged at the top of the pump cover body 101, and a through pump inlet 103 is provided on the pump cover body 101 and the pump inlet portion 102; the lower end surface of the pump cover body 101 has a pump cover boss 104 arranged around the pump inlet 103, and the top of the pump cover boss 104 and the circumferential surface of the pump cover body 101 are flat. At this time, a gap throttling is formed between the pump cover boss 104 and the rotor end cover, as shown in FIG. Figure 11 As shown in the figure, the pressure in area A rises, and the pressure at the periphery of the rotor end cover rises. 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 lower end surface of the pump cover, and avoiding friction between the rotor end cover and the lower end surface of the pump cover.

[0050] Example 7:

[0051] On the basis of the above-mentioned embodiment 6, in order to make the thickness of the pump cover body 101 more uniform, reduce the stress concentration on the pump cover body 101, and extend the service life of the pump cover, the lower end surface of the pump cover body 101 can also be provided with a groove surrounding the pump cover boss 104.

[0052] Example 8:

[0053] A centrifugal pump, comprising the pump cover 10 of any one of the above embodiments 1 to 7, such as Figures 9 to 12 As shown, it also includes a pump body 20 and a rotor 30. The pump cover 10 and the pump body 20 are sealed to form a pump cavity. The rotor 30 is suspended and non-contacted in the pump cavity. When the rotor 30 floats due to the pressure of the liquid in the pump cavity, a gap throttling is formed between the end cover of the rotor and the lower end surface of the pump cover 10. The space formed between the end cover of the rotor and the lower end surface of the pump cover 10 gradually expands from the center of the rotor 30 to both sides. The angle between the end cover of the rotor and the lower end surface of the pump cover can be 1° to 20°, preferably 3° to 10°. At this time, at the periphery of the rotor end cover in this space, that is, Figures 9 to 12 In the area at point A, the pressure in this area rises, and the rotor end cover is subjected to a force that prevents the rotor 30 from floating further, thereby preventing the rotor 30 from floating further and contacting the lower end surface of the pump cover 10, thereby avoiding friction.

[0054] 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.

[0055] 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.

[0056] 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 pump cover, characterized in that: It includes an integrally formed pump cover body and a pump inlet; the pump inlet is arranged on the top of the pump cover body, and a through pump inlet is provided on the pump cover body and the pump inlet; the lower end surface of the pump cover body has a central high point and a peripheral low point, and the lower end surface is inclined from the central high point to the peripheral low point to form a conical surface with the central part higher than the edge part.

2. The pump cover according to claim 1, characterized in that The lower end surface of the pump cover body is provided with a pump cover boss or a pump cover plane arranged around the pump inlet, and a tapered surface inclined from the pump cover boss or the pump cover plane to a peripheral low point.

3. The pump cover according to claim 1, characterized in that The top of the pump cover body is provided with a first groove surrounding the pump inlet portion.

4. The pump cover according to claim 2, characterized in that: The lower end surface of the pump cover body is provided with a second groove surrounding the pump cover boss or the pump cover plane.

5. The pump cover according to claim 1, characterized in that A connecting thread is provided on the outer peripheral surface of the pump inlet portion.

6. The pump cover according to claim 1, characterized in that The inclination angle of the tapered surface is between 1° and 10°.

7. The pump cover according to claim 1, characterized in that The pump cover body is provided with a plurality of mounting holes arranged at equal intervals along the circumferential direction.

8. A pump cover, characterized in that: It includes an integrally formed pump cover body and a pump inlet; the pump inlet is arranged on the top of the pump cover body, and a through pump inlet is provided on the pump cover body and the pump inlet; the lower end surface of the pump cover body has a pump cover boss arranged around the pump inlet.

9. A centrifugal pump, characterized in that: It comprises the pump cover according to any one of claims 1 to 8, and also comprises a pump body and a rotor, 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.

10. The centrifugal pump according to claim 9, characterized in that 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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