Slurry pump capable of preventing impeller from loosening

Abstract

The invention discloses a slurry pump capable of preventing an impeller from loosening. The slurry pump comprises a pump shaft, the impeller, an impeller nut and an impeller sealing cover, wherein the impeller is positioned on the side wall of the pump shaft in a key sleeving mode, and the impeller nut and the impeller sealing cover are connected to the side wall of the front end of the pump shaft in a threaded mode. An annular connecting groove with external threads is machined in the side wall of the front end of the pump shaft, and a set of screw connecting holes distributed circumferentially are machined in the step face of the rear end of the annular connecting groove. An inner hole of the impeller nut is provided with an internal thread matched with the annular connecting groove in the side wall of the front end of the pump shaft, and the outer wall of the impeller nut is provided with a group of circumferentially distributed screw passing grooves; the impeller nut is connected to the rear section of the pump shaft annular connecting groove in a threaded mode, the impeller nut and the pump shaft annular connecting groove are circumferentially locked through screws, the impeller is axially positioned forwards, and the impeller sealing cover is connected to the front section of the pump shaft annular connecting groove in a threaded mode and axially presses the impeller nut. According to the slurry pump disclosed by the invention, the looseness of the impeller nut caused by vibration is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to a slurry pump capable of preventing impeller loosening, and belongs to the technical field of water conservancy machinery. BACKGROUND

[0002] The reliability of the pump is required to be high in the production process of high-density polyethylene (HDPE), and the shutdown caused by the loosening or falling of the impeller of the pump will seriously affect the industrial production. When the HDPE slurry circulating pump transports materials, the materials are prone to "material aggregation" and "wire drawing" in the pump body, which affects the subsequent production process and makes the user system unable to operate normally, which may cause great economic loss to the user. SUMMARY

[0003] The present application aims to provide a slurry pump capable of preventing impeller loosening.

[0004] The present application is achieved by the following technical scheme:

[0005] The slurry pump capable of preventing impeller loosening comprises a pump shaft, an impeller positioned on the side wall of the pump shaft through a key sleeve, an impeller nut screw-connected to the front end side wall of the pump shaft, and an impeller cover.

[0006] The front end side wall of the pump shaft is processed with an annular connecting groove with external threads, and a group of circumferentially distributed screw connection holes are processed on the rear end step surface of the annular connecting groove.

[0007] The inner hole of the impeller nut is processed with internal threads matched with the annular connecting groove of the front end side wall of the pump shaft, and a group of circumferentially distributed screw passing grooves are processed on the outer wall of the impeller nut.

[0008] The impeller nut is screw-connected to the rear section of the annular connecting groove of the pump shaft, the rear end outer edge of the impeller nut is pressed against the front end port portion of the impeller, the impeller is axially positioned forward, and the impeller cover is screw-connected to the front section of the annular connecting groove of the pump shaft and axially presses the impeller nut.

[0009] The number of screw connection holes on the rear end step surface of the annular connecting groove of the pump shaft is N, the number of screw passing grooves on the outer wall of the impeller nut is N+1, the impeller nut is screw-rotated to any circumferential position on the annular connecting groove of the pump shaft, at least one set of screw passing grooves on the outer wall of the impeller nut is aligned with the screw connection holes on the rear end step surface of the annular connecting groove of the pump shaft, a screw is installed at the aligned screw passing groove and screw connection hole, and the impeller nut is circumferentially locked relative to the pump shaft.

[0010] The butt joint surface of the impeller cover and the impeller adopts a stepped structure for butt joint, and a sealing ring is installed in the groove at the butt joint surface.

[0011] The side wall of the impeller cover, where it connects with the front end of the impeller, has a conical structure.

[0012] Beneficial effects

[0013] The slurry pump of the present invention uses screws to lock the impeller nut relative to the impeller circumference, thus preventing the impeller nut from loosening due to vibration; by designing the side wall of the impeller cover and the front end of the impeller into a conical structure, the inlet liquid flow of the pump is made more uniform and stable; the conical design can effectively prevent the material from "accumulating" and "stringing" inside the pump body during material transportation, ensuring the continuous operation of the pump. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the slurry pump of the present invention;

[0015] Figure 2 This is a schematic diagram of the impeller nut and the pump shaft circumferential locking in the slurry pump of the present invention;

[0016] In the diagram, 1-pump shaft, 2-impeller, 3-impeller nut, 4-screw, 5-impeller cover, 6-sealing ring. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Example

[0019] like Figure 1 As shown, a slurry pump for preventing impeller loosening according to the present invention includes a pump shaft 1, an impeller 2 positioned on the side wall of the pump shaft 1 by a key sleeve, an impeller nut 3 threaded to the front side wall of the pump shaft 1, and an impeller cover 5.

[0020] The front end sidewall of the pump shaft 1 is machined with an annular connecting groove with external threads, and a set of circumferentially distributed screw connecting holes are machined on the rear end step surface of the annular connecting groove.

[0021] The inner hole of the impeller nut 3 is machined with an internal thread that matches the annular connecting groove on the front end side wall of the pump shaft 1, and the outer wall of the impeller nut 3 is machined with a set of circumferentially distributed screw passage grooves.

[0022] The impeller nut 3 is threaded to the rear section of the annular connecting groove of the pump shaft 1. The outer edge of the rear end of the impeller nut 3 presses against the front port of the impeller 2 to position the impeller 2 forward axially. The impeller cover 5 is threaded to the front section of the annular connecting groove of the pump shaft 1 to axially press against the impeller nut 3.

[0023] The number of screw connection holes on the rear stepped surface of the annular connecting groove of the pump shaft 1 is N, and the number of screw passage slots on the outer wall of the impeller nut 3 is N+1. The impeller nut 3 is threaded to any circumferential position on the annular connecting groove of the pump shaft 1. At least one set of screw passage slots on the outer wall of the impeller nut 3 aligns with the screw connection holes on the rear stepped surface of the annular connecting groove of the pump shaft 1. Screws 4 are installed at the aligned screw passage slots and screw connection holes to lock the impeller nut 3 circumferentially relative to the pump shaft 1. Figure 2 As shown.

[0024] The impeller cover 5 and the impeller 2 are connected by a stepped platform structure, and a sealing ring 6 is installed in a groove at the connection surface.

[0025] The side wall of the impeller cover 5 is conical at the junction with the front end of the impeller 2.

Claims

1. A slurry pump for preventing impeller loosening, comprising a pump shaft, an impeller positioned on the side wall of the pump shaft via a key sleeve, an impeller nut and an impeller cover threadedly connected to the front end side wall of the pump shaft; Its features are, The front end sidewall of the pump shaft is machined with an annular connecting groove with external threads, and a set of circumferentially distributed screw connecting holes are machined on the rear end step surface of the annular connecting groove. The inner hole of the impeller nut is machined with an internal thread that matches the annular connecting groove on the front end side wall of the pump shaft, and the outer wall of the impeller nut is machined with a set of circumferentially distributed screw passage slots. The impeller nut is threaded to the rear section of the pump shaft annular connecting groove. The outer edge of the rear end of the impeller nut presses against the front port of the impeller to position the impeller forward axially. The impeller cover is threaded to the front section of the pump shaft annular connecting groove to axially press against the impeller nut. The number of screw connection holes on the rear stepped surface of the pump shaft annular connecting groove is N, and the number of screw through grooves on the outer wall of the impeller nut is N+1. The impeller nut is threaded to any circumferential position on the pump shaft annular connecting groove. At least one set of screw through grooves on the outer wall of the impeller nut and screw connection holes on the rear stepped surface of the pump shaft annular connecting groove are aligned. Screws are installed at the aligned screw through grooves and screw connection holes to lock the impeller nut relative to the impeller circumference.

2. A slurry pump for preventing impeller loosening as described in claim 1, characterized in that, The impeller cover and the impeller are connected by a stepped platform structure, and a sealing ring is installed in a groove at the connection surface.

3. A slurry pump for preventing impeller loosening as described in claim 1 or 2, characterized in that, The side wall of the impeller cover, where it connects with the front end of the impeller, has a conical structure.

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