Structure for preventing large sewage pump impeller bolt from loosening

Abstract

The invention discloses a structure for preventing an impeller bolt of a large sewage pump from loosening, which comprises a motor output shaft and an impeller fixed on the motor output shaft through a nut, and is characterized by further comprising a shaft cap, and the shaft cap is close to the nut so as to prevent the nut from loosening when the impeller rotates reversely.

Description

Technical Field

[0001] The invention relates to the technical field of sewage pumps, and in particular to a structure for preventing bolts of a large sewage pump impeller from loosening. Background Art

[0002] When a large sewage pump is tested, the impeller may reverse, causing the impeller nut to loosen and malfunction. For this reason, China Utility Model Patent Authorization Announcement No. CN2760302Y discloses a pump impeller anti-loosening device, in which a locking chuck is set between the impeller and the impeller nut. After the impeller nut presses the locking chuck onto the impeller, the side of the locking chuck is pressed onto the outer working surface of the impeller nut. The patent assembly is complex. China Utility Model Patent Authorization Announcement No. CN2783006Y discloses a pump impeller with an anti-falling device, including a pump shaft, blades, and a locking nut. The difference is that it also includes a backstop device, which is arranged between the blade and the locking nut. The backstop device is two backstop plugs, and the front end of the pump shaft is symmetrically provided with shaft grooves corresponding to the number of backstop plugs. The backstop plugs are fixedly configured with the shaft grooves, and the distance from the outer periphery of the backstop plug to the center of the pump shaft is less than the inner diameter of the locking nut, but greater than the radius of the pump shaft. The patent structure is complex. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a simple structure to prevent the loosening of the impeller bolts of large sewage pumps in view of the problem that the impeller may reverse during the test of the existing large sewage pumps, causing the impeller nut to loosen and causing the sewage pump to malfunction.

[0004] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0005] A structure for preventing the loosening of the impeller bolts of a large sewage pump comprises a motor output shaft and an impeller fixed on the motor output shaft by a nut. The structure is characterized in that it also comprises a shaft cap which is close to the nut to prevent the nut from loosening when the impeller is reversed.

[0006] In a preferred embodiment of the present invention, the shaft cap comprises a coaxially arranged cap head, a flange section and a threaded section, wherein the threaded section is screwed into the bolt hole of the impeller and is close to the nut, and the flange section is close to the shaft of the impeller.

[0007] In a preferred embodiment of the present invention, a radial hole is provided in the cap head to facilitate the rotation of the shaft cap.

[0008] In a preferred embodiment of the present invention, the thread segment is a hollow structure.

[0009] Due to the adoption of the above technical solution, the present invention prevents the nut from loosening when the impeller is reversed by configuring a cap head close to the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of a structure for preventing the loosening of the impeller bolts of a large sewage pump according to the present invention.

[0011] Figure 2 It is a structural schematic diagram of the cap head of the present invention. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] See also Figure 1 and Figure 2 The figure shows a structure for preventing the loosening of the impeller bolts of a large sewage pump, including a motor output shaft 100 and an impeller 300 fixed on the motor output shaft 100 by a nut 200, and also includes a shaft cap 400, which is close to the nut 200 to prevent the nut 200 from loosening when the impeller 300 is reversed.

[0014] The shaft cap 400 includes a coaxially arranged cap head 410, a flange section 420 and a threaded section 430, wherein the threaded section 430 is a hollow structure to reduce the pressing area with the nut 200. A radial hole 411 is provided in the cap head 410 to facilitate the insertion of the rotating shaft cap 400 of the rotating rod.

[0015] During installation, the threaded section 430 is screwed into the bolt hole 310 of the impeller 300 and is close to the nut 200 , and the flange section 420 is close to the shaft 320 of the impeller 300 .

Claims

1. A structure for preventing the loosening of the impeller bolts of a large sewage pump, comprising a motor output shaft and an impeller fixed to the motor output shaft by a nut, characterized in that: It also includes a shaft cap, which is close to the nut to prevent the nut from loosening when the impeller is reversed.

2. A structure for preventing the loosening of bolts of a large sewage pump impeller according to claim 1, characterized in that: The shaft cap comprises a cap head, a flange section and a threaded section which are coaxially arranged, wherein the threaded section is screwed into the bolt hole of the impeller and is close to the nut, and the flange section is close to the shaft of the impeller.

3. A structure for preventing the loosening of bolts of a large sewage pump impeller according to claim 2, characterized in that: A radial hole is arranged in the cap head to facilitate the rotation of the shaft cap.

4. A structure for preventing the loosening of bolts of a large sewage pump impeller according to claim 3, characterized in that: The threaded section is a hollow structure.

Images