Impeller and centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to an impeller and a centrifugal pump. The multiple blades are distributed in an array mode in the circumferential direction with the axis of the shaft hole as the center, the blade roots of the blades are close to the shaft hole, the blade tips of the blades are close to the edge of the lower wheel disc, and the lower edges of the blades are integrally formed and connected with the upper surface of the wheel disc; wherein cavities are formed in the blades, and openings communicated with the cavities are formed in the lower surface of the lower wheel disc. According to the impeller, shrinkage of the blades can be reduced or even eliminated, so that the geometric shape and size precision of the blades are guaranteed, and the quality of the centrifugal pump is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal pumps, and in particular to an impeller and a centrifugal pump. BACKGROUND

[0002] The centrifugal pump comprises a rotatable impeller, the impeller comprises a plurality of blades arranged around the circumferential direction of the impeller, and a medium flow channel is formed between two adjacent blades. When the centrifugal pump is working, the impeller rotates, the medium enters the medium flow channel from the inlet of the centrifugal pump, and under the action of the centrifugal force of the impeller, the medium enters the outlet of the centrifugal pump from the medium flow channel. The geometric shape and dimensional accuracy of the impeller directly affect the quality of the centrifugal pump, for example, the efficiency and service life of the centrifugal pump.

[0003] In the related art, the impeller is formed by casting or injection molding. In order to increase the strength of the blades, the thickness of the blades is usually designed to be relatively thick.

[0004] However, when the thickness of the blades of the impeller is large, the blades after forming will have a serious shrinkage phenomenon, resulting in that the finally obtained blades are inconsistent with the ideal blades in the design stage, and the geometric shape and dimensional accuracy of the impeller cannot be guaranteed. SUMMARY

[0005] The embodiments of the present application provide an impeller and a centrifugal pump to improve the shrinkage problem of the blades formed by casting or injection molding due to the large thickness.

[0006] In a first aspect, the impeller provided by the embodiments of the present application comprises:

[0007] a lower disc, the lower disc is provided with a shaft hole;

[0008] a plurality of blades, the plurality of blades are distributed in a circumferential array with the shaft center of the shaft hole as the center, the blade root of the blade is close to the shaft hole, the blade tip of the blade is close to the edge of the lower disc, and the lower edge of the blade is integrally connected with the upper surface of the disc;

[0009] wherein the blade has a cavity inside, and the lower surface of the lower disc has an opening in communication with the cavity.

[0010] In a second aspect, the centrifugal pump provided by the embodiments of the present application comprises the impeller.

[0011] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0012] By arranging the cavity inside the blade, the wall thickness of the blade is reduced, the blade can bear force uniformly, stress concentration is reduced, and therefore the shrinkage of the blade can be reduced or even eliminated, so that the geometric shape and dimensional accuracy of the blade are guaranteed, and the quality of the centrifugal pump is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 An upper schematic view of an impeller of an embodiment of the application is shown.

[0014] Figure 2 A lower schematic view of an impeller of an embodiment of the application is shown.

[0015] Figure 3 A longitudinal sectional view of an impeller of an embodiment of the application is shown.

[0016] Figure 4 A side schematic view of an impeller of an embodiment of the application is shown.

[0017] Figure 5 A schematic view of Figure 4 a section at A-A is shown.

[0018] Figure 6 A schematic view of another impeller of an embodiment of the application is shown.

[0019] Reference signs:

[0020] 10, upper disc; 11, inlet;

[0021] 20, lower disc; 21, shaft hole; 22, opening;

[0022] 30, blade; 31, cavity; 32, first circumferential side wall; 33, second circumferential side wall. DETAILED DESCRIPTION

[0023] The technical solutions of the embodiments of the application will be further described below in conjunction with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the embodiments of the application, but not to limit the embodiments of the application. In addition, it should be noted that, for the convenience of description, only the parts related to the embodiments of the application are shown in the drawings, not all.

[0024] In the embodiments of the application, some orientation words are defined. Without being stated otherwise, the orientation words used such as "upper", "lower", "left", "right", "inner", "outer" are used for the convenience of understanding, and thus do not constitute a limitation on the protection scope of the embodiments of the application.

[0025] In the embodiments of the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0026] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0027] The centrifugal pump comprises a pump body (not shown) and a motor (not shown) connected to the pump body, the pump body comprises a pump shell (not shown) and an impeller arranged in the pump shell, the impeller is fixedly connected with a motor shaft of the motor, so that when the motor works, the impeller can rotate in the pump shell.

[0028] Figure 1 An upper schematic view of the impeller of the embodiment of the present application is shown. Figure 2 A lower schematic view of the impeller of the embodiment of the present application is shown. As Figure 1 and Figure 2 The impeller comprises an upper disc 10, a lower disc 20 and blades 30.

[0029] A shaft hole 21 for connecting with the motor shaft is arranged at the center position of the lower disc 20. An inlet 11 for the medium (such as water) to enter the inside of the impeller is arranged at the center position of the upper disc 10. The upper disc 10 and the lower disc 20 are arranged in a spaced manner along the up-down direction of the impeller.

[0030] Multiple blades 30 are fixedly disposed between the upper impeller 10 and the lower impeller 20. Specifically, the upper surface of the blades 30 is fixedly disposed on the lower surface of the upper impeller 10, and the lower surface of the blades 30 is disposed on the upper surface of the lower impeller 20. The multiple blades 30 are arranged in a circumferential array with the axis of the shaft hole as the center. Each blade 30 includes a blade root and a blade tip. The blade root is close to the shaft hole, and the blade tip is close to the edge of the upper and lower impellers. A medium flow channel is formed between two adjacent blades 30. One end of the medium flow channel communicates with the inlet 11, and the other end of the medium flow channel is located at the edge of the impeller. The lower edge of the blades 30 is integrally formed with the lower impeller 20, for example, by injection molding or casting.

[0031] When the impeller is working, the impeller rotates, the medium enters the medium flow channel from the inlet 11, and under the action of the centrifugal force of the impeller, the medium is thrown out from the edge of the impeller.

[0032] It should be noted that the shape of the blade 30 is not limited and can be any shape known in the prior art that can be applied to a centrifugal pump.

[0033] It should be noted that, as Figure 6 As shown, in some embodiments, the impeller may not include the upper disc 10.

[0034] Figure 3 A longitudinal sectional view of the impeller according to an embodiment of this application is shown. Figure 3 As shown, the blade 30 of this embodiment has a cavity 31 inside. Therefore, the wall thickness of the blade 30 in this embodiment is not the distance between the two opposite outer surfaces of the blade 30 in the prior art, but rather the wall thickness of the sidewall constituting the cavity 31. As a result, the wall thickness of the blade 30 in this embodiment can be reduced, thereby reducing or even eliminating the shrinkage of the blade 30 formed by casting or injection molding.

[0035] like Figure 2 and Figure 3 As shown, in order to facilitate the formation of the cavity 31 inside the blade 30, the lower surface of the lower wheel 20 has an opening 22 communicating with the cavity 31. In this way, a protrusion corresponding to the cavity 31 can be provided in the casting or injection mold, thereby forming the cavity 31 inside the blade 30, and the position of the opening 22 of the lower wheel 20 corresponds to the inlet and outlet of the protrusion.

[0036] like Figure 2 and Figure 3 As shown, the position of the opening 22 corresponds to the position of the projection of the lower surface of the blade 30 onto the lower impeller 20. This facilitates the removal of the formed impeller from the mold.

[0037] Figure 4 A schematic diagram of the impeller side surface according to an embodiment of this application is shown. Figure 5 It shows Figure 4A cross-sectional view at A-A. As shown in the cross-section of the blade 30 (parallel to the lower disk 20), the profile shape of the cavity 31 is similar to that of the blade 30, and the cavity 31 is located at the central position of the thickness of the blade 30. In this way, the wall thickness of each position of the blade 30 is close, which can reduce stress and shrinkage. Figure 5

[0038] As shown in the cross-section of the blade 30 (parallel to the lower disk 20), the profile shape of the cavity 31 is similar to that of the blade 30, and the cavity 31 is located at the central position of the thickness of the blade 30. In this way, the wall thickness of each position of the blade 30 is close, which can reduce stress and shrinkage. Figure 5

[0039] In some embodiments, the wall thickness of the first circumferential side wall 32 can be 1mm to 3.5mm, so as to ensure that the first circumferential side wall 32 has a small thickness and reduce shrinkage. For similar considerations, the wall thickness of the second circumferential side wall 33 can be 1mm to 3.5mm.

[0040] In some embodiments, along the direction from the tip to the root, the wall thickness of the first circumferential side wall 32 of the same blade 30 is equal at each position, which can reduce the stress of the first circumferential side wall 32 and reduce shrinkage. For similar considerations, the wall thickness of the second circumferential side wall 33 is equal at each position.

[0041] In some embodiments, for the same blade 30, the wall thickness of the first circumferential side wall 32 is equal to the wall thickness of the second circumferential side wall 33. In this way, the strength of each position of the blade 30 is close.

[0042] In some embodiments, the cavity 31 extends along the up-down direction of the impeller, and the size of the cavity 31 is equal at each position in the up-down direction of the impeller.

[0043] It should be noted that the above-mentioned features of the impeller can be used alone or in combination.

[0044] The impeller according to the embodiments of the present application can reduce or even eliminate shrinkage, and thus has good geometric shape and size accuracy, and further the centrifugal pump with the impeller according to the embodiments of the present application has good quality, such as efficiency, service life, etc.

[0045] ​​Although the present application has been described in detail with general description, specific embodiments and experiments, some modifications or improvements can be made on the basis of the embodiments of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the embodiments of the present application, all belong to the scope of the embodiments of the present application claimed.

Claims

1. An impeller, characterized by The impeller comprises: a lower disc (20) provided with a shaft hole (21); a plurality of blades (30) arranged in a circumferential array with the shaft center of the shaft hole (21) as the center, a blade root of the blade (30) being close to the shaft hole (21), a blade tip of the blade (30) being close to an edge of the lower disc (20), and a lower edge of the blade (30) being integrally connected with an upper surface of the lower disc (20); wherein the blade (30) has a cavity (31) inside, and an lower surface of the lower disc (20) has an opening (22) in communication with the cavity (31).

2. The impeller of claim 1, wherein The position of the opening (22) corresponds to the position of the projection of the lower surface of the blade (30) on the lower disc (20).

3. The impeller of claim 1, wherein In a cross section of the blade (30) parallel to the lower disc (20), the profile shape of the cavity (31) is similar to the profile shape of the blade (30), and the cavity (31) is located at the central position of the thickness of the blade (30).

4. The impeller of claim 1, wherein The cavity (31) divides the blade (30) into a first circumferential side wall (32) and a second circumferential side wall (33) arranged at intervals in the thickness direction, and the distance between the outer wall surface of the first circumferential side wall (32) and the outer wall surface of the second circumferential side wall (33) of the same blade (30) is 3.5mm to 10mm.

5. The impeller according to claim 4, wherein the wall thickness of the first circumferential side wall (32) is 1mm to 3.5mm; and / or the wall thickness of the second circumferential side wall (33) is 1mm to 3.5mm.

6. The impeller according to claim 4 or 5, wherein the wall thickness of the first circumferential side wall (32) of the same blade (30) is equal at each position in the direction from the blade tip to the blade root; and / or the wall thickness of the second circumferential side wall (33) of the same blade (30) is equal at each position in the direction from the blade tip to the blade root.

7. The impeller of claim 4 or 5, wherein For the same blade (30), the wall thickness of the first circumferential side wall (32) is equal to the wall thickness of the second circumferential side wall (33).

8. The impeller of claim 4 or 5, wherein The cavity (31) extends in the up-down direction of the blade (30), and the outer dimensions of the cavity (31) are equal at each position in the up-down direction of the blade (30).

9. The impeller of claim 1, wherein The impeller further comprises: an upper disc (10) fixedly arranged on the upper surfaces of the plurality of blades (30), the upper disc (10) having an inlet (11) corresponding to the shaft hole (21).

10. A centrifugal pump, characterized by The centrifugal pump comprises the impeller according to any one of claims 1 to 9.

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