Impeller assembly structure with self-locking function

Abstract

The utility model discloses a kind of impeller assembly structure achieving self-locking function, including impeller, shaft head bolt, the impeller is installed on pump shaft by shaft head bolt, self-locking washer assembly is installed between the impeller and shaft head bolt, the self-locking washer assembly includes self-locking washer A, self-locking washer B, the inner surface of self-locking washer A, self-locking washer B is all wedge shape, and the wedge shape of two inner surfaces is mutually matched, the outer surface of self-locking washer A, self-locking washer B is all radioactive sawtooth.The utility model is characterized by: by setting self-locking washer assembly between impeller and shaft head bolt, the self-locking function of impeller assembly structure is achieved, greatly improves the anti-loose effect of shaft head bolt, to cope with more severe corrosive medium working condition.

Description

Technical Field

[0001] This utility model relates to the technical field of canned motor pumps, specifically to an impeller assembly structure that achieves a self-locking function. Background Technology

[0002] With increasingly stringent international and domestic requirements for low-carbon and green environmental protection, the canned motor pump industry is experiencing unprecedented development opportunities. The demand for pumps designed for handling highly corrosive media is growing daily, leading to increasingly stringent requirements for the anti-loosening effect of liquid-passing fasteners. In traditional designs, the shaft head bolts bear not only static loads but also alternating dynamic loads caused by shaft rotation. For example... Figure 1 As shown, our existing shaft head bolt fastening structure only uses bolts to fix the impeller to the rotating shaft, and the anti-reverse washer is rolled up and wrapped around the side of the bolt to prevent the shaft head bolt from loosening during pump operation. However, according to feedback from on-site customers, this structure, when dealing with highly corrosive media such as alkalis and strong acids, causes the shaft head bolt to loosen after the pump has been running for a period of time, resulting in severe wear of the shaft sleeve, bearings, and thrust disc, necessitating on-site shutdown for maintenance. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an impeller assembly structure that achieves a self-locking function.

[0004] The technical solution adopted by this utility model to achieve the above objectives is as follows: An impeller assembly structure for achieving a self-locking function includes an impeller and a shaft head bolt. The impeller is mounted on a pump shaft via the shaft head bolt. A self-locking washer assembly is installed between the impeller and the shaft head bolt. The self-locking washer assembly includes a self-locking washer A and a self-locking washer B. The inner surfaces of the self-locking washers A and B are both wedge-shaped, and their wedge shapes fit together. The outer surfaces of the self-locking washers A and B are both radially serrated.

[0005] The hardness of the radial serrations of the self-locking washer assembly is greater than that of the shaft head bolt and the hub F-side end face of the impeller.

[0006] The friction coefficient μa of the radial serrations on the outer surface of the self-locking washer assembly is greater than the friction coefficient μb of its wedge-shaped inner surface.

[0007] The feature of this utility model is that by setting a self-locking washer assembly between the impeller and the shaft head bolt, the self-locking function of the impeller assembly structure is realized, which greatly improves the anti-loosening effect of the shaft head bolt, thereby coping with more severe and corrosive media conditions. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the existing impeller assembly structure; Figure 2This is a schematic diagram of the structure of this utility model; Figure 3 This is a structural schematic diagram of a self-locking washer assembly; Figure 4 yes Figure 3 Top view.

[0009] Among them: 1. Impeller; 2. Shaft head bolt; 3. Pump shaft; 4. Self-locking washer assembly; 41. Self-locking washer A; 42. Self-locking washer B; 5. Wedge shape; 6. Radial serrations. Detailed Implementation

[0010] like Figure 2-4 As shown, this utility model is an impeller assembly structure that achieves a self-locking function, including an impeller 1 and a shaft head bolt 2. The impeller 1 is mounted on the pump shaft 3 via the shaft head bolt 2. This utility model eliminates... Figure 1 The design concept involves installing a self-locking washer assembly 4 between the hub F-side end face of the impeller 1 and the shaft head bolt 2. The self-locking washer assembly 4 includes self-locking washers A41 and B42. The inner surfaces of both self-locking washers A41 and B42 are wedge-shaped 5, and these wedge shapes 5 cooperate with each other, generating radial expansion under axial force to enhance the self-locking effect. The outer surfaces of self-locking washers A41 and B42 (i.e., the surfaces in contact with the shaft head bolt 2 and the hub F-side end face of the impeller 1) are radially serrated 6, and surface hardening treatment is applied to ensure the self-locking washer... The radial serrations 6 of the self-locking washer assembly 4 (self-locking washer A41, self-locking washer B42) have a higher hardness than the shaft head bolt 2 and the hub F side end face of the impeller 1. This causes the radial serrations 6 of the self-locking washer assembly 4 to strongly engage with the workpiece surface when the shaft head bolt 2 is tightened. The friction coefficient μa of the radial serrations 6 on the outer surface of the self-locking washer assembly 4 is greater than the friction coefficient μb of the inner surface of its wedge shape 5. When the impeller 1 rotates, even if the workpiece undergoes a slight displacement, it will only appear between the inner surfaces of the wedge shape 5 of the self-locking washer assembly 4, thereby generating a greater biting force and realizing the self-locking function.

[0011] This invention achieves the self-locking function of the impeller 1 assembly structure by setting a self-locking washer assembly 4 between the impeller 1 and the shaft head bolt 2, which greatly improves the anti-loosening effect of the shaft head bolt 2, thus coping with more severe and corrosive media conditions.

[0012] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An impeller assembly structure for achieving a self-locking function, characterized in that: The pump includes an impeller and a shaft head bolt. The impeller is mounted on the pump shaft via the shaft head bolt. A self-locking washer assembly is installed between the impeller and the shaft head bolt. The self-locking washer assembly includes a self-locking washer A and a self-locking washer B. The inner surfaces of the self-locking washers A and B are both wedge-shaped, and their wedge shapes fit each other. The outer surfaces of the self-locking washers A and B are both radially serrated.

2. The impeller assembly structure for achieving a self-locking function as described in claim 1, characterized in that: The hardness of the radial serrations of the self-locking washer assembly is greater than that of the shaft head bolt and the hub F-side end face of the impeller.

3. The impeller assembly structure for achieving a self-locking function as described in claim 1 or 2, characterized in that: The friction coefficient μa of the radial serrations on the outer surface of the self-locking washer assembly is greater than the friction coefficient μb of its wedge-shaped inner surface.

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