A closed impeller resistant to riveting deformation

Abstract

This utility model relates to the field of impellers, and more particularly to a closed impeller resistant to riveting deformation. It includes an impeller with a bushing fixed along its axis. The bushing is connected to a drive shaft, enabling the drive shaft to rotate the impeller around its own axis. The impeller has a middle blade and a lower blade. The middle blade is fixed to one end of the lower blade, and the bushing is connected to the lower blade through a riveting member. A riveting plate is provided on the side of the lower blade away from the middle blade, and the riveting member passes through the riveting plate and is fixed to the lower blade. The outer edge of the riveting plate forms a bending-resistant portion, and the cross-section of the bending-resistant portion through the impeller axis is C-shaped. This application adds a riveting plate to the outside of the lower blade, allowing it to bear the riveting pressure instead of the lower blade, preventing deformation of the lower blade caused by riveting and ensuring the impeller's accuracy. The riveting plate uses a material with low hardness to effectively buffer and disperse the riveting impact, significantly reducing its own deformation and ensuring stable pressure transmission.

Description

Technical Field

[0001] This utility model relates to the field of impellers, and more particularly to a closed impeller resistant to riveting deformation. Background Technology

[0002] A closed impeller is an impeller composed of a front lower blade and blades. This design provides high efficiency and sealing, but it is more difficult to manufacture. The blades of a closed impeller are completely surrounded by the front lower blade, forming a closed space, which makes the fluid flow more regular and efficient.

[0003] In traditional closed impeller manufacturing, especially for split structures comprising upper, middle, and lower blades, riveting is commonly used to fix the lower blade to the middle blade. A common riveting process involves inserting a rivet or similar fitting through the lower blade and the component to be connected, then applying riveting pressure to the protruding end of the fitting to deform it, thus achieving a fastener. However, this process has a significant problem: the applied riveting pressure acts directly on the lower blade. Because the riveting pressure is usually large and concentrated, it can easily cause plastic deformation or warping of the lower blade near the riveting point or even the entire blade. As a crucial component of the closed impeller, the shape accuracy of the lower blade is critical to the impeller's dynamic balance, airflow efficiency, and service life. Therefore, how to avoid deformation of the lower blade due to riveting pressure during the riveting process has become a key issue in improving the manufacturing quality and performance of closed impellers. Utility Model Content

[0004] The purpose of this invention is to provide a closed impeller resistant to riveting deformation, in order to solve the problems existing in the prior art.

[0005] The technical solution of this utility model is: a closed impeller resistant to riveting deformation, including an impeller, wherein a bushing is fixed along the axis of the impeller, and the bushing is connected to a drive shaft so that the drive shaft can drive the impeller to rotate around its own axis;

[0006] The impeller has a middle blade and a lower blade. The middle blade is fixed to one end of the lower blade, and the bushing is connected to the lower blade through a riveting component.

[0007] A rivet plate is provided on the side of the lower blade away from the middle blade, and the rivet is fixed to the lower blade through the rivet plate; the outer edge of the rivet plate forms an anti-bending part, and the cross section of the anti-bending part through the impeller axis is formed into a C-shaped structure.

[0008] Preferably, both the rivet plate and the lower blade have through holes through which the riveted parts can pass. The middle part of the lower blade is recessed towards the middle blade, so that the side of the lower blade away from the middle blade forms a receiving area, and the rivet plate is disposed in the receiving area.

[0009] Preferably, the riveting component includes a riveting base, one end of which is provided with a riveting portion. The riveting portion forms a protruding end after passing through the lower blade and the riveting plate in sequence. The protruding end deforms radially when subjected to an axial force toward the lower blade.

[0010] Preferably, the riveting portions are evenly arranged in three places around the axis of the riveting base.

[0011] Preferably, the rivet plate is made of a material with a hardness lower than that of the lower blade.

[0012] Preferably, the bending-resistant portion is formed by stamping and bending a riveting plate, and the thickness of the bending-resistant portion is less than the thickness of the riveting plate.

[0013] Preferably, the bending-resistant portion is welded and fixed to the outer edge surface of the rivet plate.

[0014] Preferably, the bushing and the riveting component are integrally formed.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] (1) This application adds a rivet plate to the outside of the lower blade, so that it can replace the lower blade to bear the rivet pressure, prevent the lower blade from deforming due to rivet pressure, and ensure the accuracy of the impeller. The rivet plate is made of a material with low hardness to effectively buffer and disperse the rivet pressure impact. Its special non-coplanar C-shaped anti-bending part design on the outer edge significantly enhances the structural rigidity, greatly reduces its own deformation, and ensures stable pressure transmission.

[0017] (2) This application utilizes the bowl-shaped accommodating area formed by the concavity in the middle of the lower blade to accommodate the rivet plate, thereby optimizing the axial space occupation and making the structure compact. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a first-view structural diagram of a closed impeller resistant to riveting deformation according to the present invention.

[0020] Figure 2 This is a second-view structural diagram of a closed impeller resistant to riveting deformation according to the present invention;

[0021] Figure 3 This is a cross-sectional view of a closed impeller resistant to riveting deformation as described in this utility model;

[0022] Among them: 1. Impeller, 11. Upper blade, 12. Middle blade, 13. Lower blade, 3. Riveting component, 31. Riveting base, 32. Riveting part, 321. Protruding end, 4. Riveting plate, 5. Bending part, 6. Accommodation area. Detailed Implementation

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] The present invention will be further described in detail below with reference to specific embodiments:

[0026] like Figures 1-3 As shown, a closed impeller resistant to riveting deformation includes an impeller 1. The impeller 1 has a central opening and a bushing fixed along its own axis. The bushing is connected to an external drive shaft, enabling the drive shaft to drive the impeller 1 to rotate around its own axis. The impeller 1 has an upper blade 11, a middle blade 12, and a lower blade 13. The middle blade 12 is fixed between the upper blade 11 and the lower blade 13 and is connected to the lower blade 13 through a riveting member 3. In this embodiment, the bushing and the riveting member 3 are integrally formed.

[0027] In order to avoid the riveting pressure acting directly on the lower blade 13 during the riveting process, which would cause the lower blade 13 to deform, this application provides a riveting plate 4 on the side of the lower blade 13 away from the middle blade 12 to bear the riveting pressure instead of the lower blade 13.

[0028] Specifically, the riveting component 3 passes through the riveting plate 4 and is fixed to the lower blade 13. The outer edge of the riveting plate 4 forms a bending-resistant portion 5. The bending-resistant portion 5 and the riveting plate 4 are not parallel and are not on the same plane, but form a certain angle or bending angle. The two are not in the same plane, thus forming a geometric feature with enhanced rigidity. When cut along the axis of the impeller 1, the cross-section of the bending-resistant portion 5 shows a C-shaped structure.

[0029] The riveting component 3 includes a planar riveting base 31. One end of the riveting base 31 protrudes with a riveting portion 32. Three riveting portions 32 are evenly arranged around the axis of the riveting base 31. Both the riveting plate 4 and the lower blade 13 have through holes through which the riveting portions 32 can pass. During the riveting operation, the riveting base 31 is fitted against the side of the lower blade 13 away from the middle blade 12, allowing the riveting portions 32 to pass through the through holes sequentially into the lower blade 13 and the riveting plate 4. Then, the protruding end 321 of the riveting portion 32 protruding from the riveting plate 4 is riveted, causing the protruding end 321 to deform radially to complete the riveting operation. During this period, the rivet plate 4 bears the riveting pressure before the lower blade 13, and is made of a material with a lower hardness than the lower blade 13. It can buffer the riveting pressure and disperse the riveting pressure, avoiding the concentrated stress during riveting that causes pit damage on the lower blade. At the same time, the bending part 5 on the outer edge of the rivet plate 4 has structural rigidity because of the geometric structure that is not on the same plane, which enables the rivet plate 4 to resist the riveting pressure during the riveting action and reduce its own deformation.

[0030] Furthermore, to reduce the axial space occupied by the bending-resistant portion 5, the middle part of the lower blade 13 is recessed towards the middle blade 12, forming a receiving area 6 on the side of the lower blade 13 away from the middle blade 12. The receiving area 6 is cup-shaped, and part of the bending-resistant portion 5 and the rivet plate 4 are disposed in the receiving area 6. This arrangement ensures that the axial dimensions of the bending-resistant portion 5 are accommodated in the receiving area 6, thereby optimizing the overall axial space occupation and making the structure more compact.

[0031] Furthermore, in a preferred embodiment of this application, the bending-resistant portion 5 is formed by stamping and bending the outer edge of the rivet plate 4, and the thickness of the bending-resistant portion 5 is less than the thickness of the rivet plate 4.

[0032] In other embodiments of this application, the bending-resistant part 5 may also be a separate C-shaped part that is fixed to the outer edge of the rivet plate 4 by welding or other means.

[0033] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A closed impeller resistant to upset deformation, characterized by, Includes an impeller (1), the impeller (1) is fixed with a bushing along the axis, the bushing is connected to a drive shaft so that the drive shaft can drive the impeller (1) to rotate around its own axis; The impeller (1) has a middle blade (12) and a lower blade (13). The middle blade (12) is fixed to one end of the lower blade (13). The bushing is connected to the lower blade (13) through a riveting piece (3). A rivet plate (4) is provided on the side of the lower blade (13) away from the middle blade (12). The rivet (3) passes through the rivet plate (4) and is fixed to the lower blade (13). An anti-bending part (5) is formed on the outer edge of the rivet plate (4). The cross section of the anti-bending part (5) through the axis of the impeller (1) is formed into a C-shaped structure.

2. The closed impeller of claim 1, wherein, Both the rivet plate (4) and the lower blade (13) have through holes through which the rivet (3) can pass. The middle part of the lower blade (13) is recessed towards the middle blade (12), so that the side of the lower blade (13) away from the middle blade (12) forms a receiving area (6), and the rivet plate (4) is disposed in the receiving area (6).

3. A closed impeller resistant to deformation by rivet pressure according to claim 2, characterized in that The riveting component (3) includes a riveting base (31), one end of which is provided with a riveting part (32). The riveting part (32) forms a protruding end (321) after passing through the lower blade (13) and the riveting plate (4) in sequence. The protruding end (321) deforms radially when subjected to an axial force toward the lower blade (13).

4. The closed impeller of claim 3, wherein The riveting parts (32) are evenly arranged in three on the riveting base (31) around the axis of the riveting base (31).

5. The closed impeller of claim 3, wherein The rivet plate (4) is made of a material with a hardness lower than that of the lower blade (13).

6. A closed impeller resistant to deformation by rivet pressure according to claim 3, characterized in that, The bending-resistant part (5) is formed by stamping and bending the rivet plate (4), and the thickness of the bending-resistant part (5) is less than the thickness of the rivet plate (4).

7. The closed impeller of claim 3, wherein The bending-resistant part (5) is welded and fixed to the outer edge surface of the rivet plate (4).

8. The closed impeller of claim 3, wherein, The bushing and the riveting part (3) are integrally formed.

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