CN211202400U - Impeller nut anti-loose sealing device - Google Patents

Abstract

The utility model discloses an impeller nut anti-loosening sealing device, comprising an impeller, a pump shaft, a locking nut, a sealing gasket and a tightening nut, which is characterized in that the tightening nut, the sealing gasket and the locking nut are connected to the pump shaft in sequence. One end of the tightening nut is in conflict with the impeller, and the other end is inserted into the trumpet-shaped locking hole of the locking nut that is also threadedly connected with the pump shaft through the tensioning seal part, and the locking nut is screwed in sequence, The locking nut is pressed against the tensioning sealing part of the tightening nut, and the thread of the tensioning sealing part is tightly fitted with the thread on the pump shaft and then sealed and pressed by the sealing gasket to achieve the purpose of locking and sealing. The utility model has the advantages of novel structure, convenient processing, low production cost, convenient and quick disassembly and assembly, high reliability of anti-loosening, and high sealing performance.

Description

Impeller nut anti-loose sealing device

technical field

The utility model relates to the field of fluid machinery, in particular to an impeller nut anti-loose sealing device for a submersible sewage pump.

Background technique

As we all know, the shaft end impeller of the existing submersible sewage pump is usually fastened with an impeller nut. For the structural design of the impeller nut, two factors need to be considered: 1. The nut should be avoided from loosening or even falling off due to vibration, reversal, etc.; 2. When transporting corrosive media and the pump shaft needs to be protected, it must also have a sealing function to isolate The pump shaft is in contact with the medium.

At present, the anti-loosening measures of impeller nut include anti-loosening washer, thread locking sealant anti-loosening, pin anti-loosening, spot welding anti-loosening, double nut anti-loosening, locking type wire thread sleeve anti-loosening and so on. In terms of anti-loosening effect, most of the above structures can be simple and reliable. However, if it also has a sealing function at the same time, there are only structures such as locking wire screw sleeves. The substantial disadvantage of this structure is: when the inner thread of the impeller nut 11 is fitted with the wire threaded sleeve 12 and then matched with the external thread on the pump shaft 13, the wire threaded sleeve 12 will occupy a certain space, and the processing of the impeller nut 11 thread must be A certain amount of compensation should be made in size. Therefore, standard taps cannot be used for the tapping of the internal threaded holes of the impeller nut 11, but a special steel wire sleeve tap is required, and the inspection of the internal thread of the impeller nut and the installation of the steel wire sleeve also need to be specially made. Special tools are inconvenient for processing and inspection, difficult to assemble and disassemble, and the reliability of anti-loosening is not high.

SUMMARY OF THE INVENTION

The purpose of the utility model is to solve the above-mentioned deficiencies of the prior art, and to provide an impeller nut anti-loose sealing device with novel structure, convenient processing, low production cost, convenient and fast disassembly and assembly, high anti-loose reliability and high sealing performance.

The technical scheme adopted by the utility model to solve its technical problems is:

An impeller nut anti-loose sealing device, comprising an impeller, a pump shaft, a locking nut, a gasket and a tightening nut, characterized in that the blind hole of the locking nut is composed of a threaded hole and a flared locking hole from the inside to the outside connected coaxially,

The tightening nut is formed by coaxially connecting the locking part and the tensioning sealing part, the tensioning sealing part is conical and has the same taper as the trumpet-shaped locking hole of the locking nut, and the tensioning sealing part is conical. The outer diameter of the big end of the sealing portion is smaller than the outer diameter of the locking portion, and at least three tensioning opening grooves are arranged in a circumferential array at the end of the tensioning sealing portion, and the tensioning opening grooves extend in the axial direction,

The tightening nut, the gasket and the locking nut are sequentially connected with the pump shaft. One end of the tightening nut is in conflict with the impeller, and the other end is inserted into the horn of the locking nut that is also threadedly connected to the pump shaft through the tightening seal. In the shape locking hole, the locking nut is tightened in sequence, so that the locking nut is pressed against the tensioning seal part of the tightening nut, and the thread of the tensioning seal part is tightly fitted with the thread on the pump shaft after insertion. It is sealed and pressed by the gasket to achieve the purpose of locking and sealing.

The sealing gasket of the utility model adopts the tetrafluoroethylene sealing gasket to achieve the effect of high sealing performance.

The taper surface inclination of the flared locking hole of the locking nut of the present invention is 10°-15°, and the present invention preferably adopts 12° to achieve the effect of high locking and sealing performance.

Because the utility model adopts the above structure, the utility model has the advantages of novel structure, convenient processing, low production cost, convenient and fast disassembly and assembly, high reliability of preventing loosening, and high sealing performance.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

Figure 2 is a front view of the tightening nut in the present invention.

FIG. 3 is a left side view of FIG. 2 .

Reference numerals: impeller 1 , pump shaft 2 , locking nut 3 , gasket 4 , tightening nut 5 , locking part 8 , tensioning sealing part 9 , tensioning opening groove 10 , washer 11 .

Detailed ways

The present utility model will be described below with reference to the accompanying drawings and embodiments.

As shown in the accompanying drawings, an impeller nut anti-loose sealing device includes an impeller 1, a pump shaft 2, a locking nut 3, a gasket 4 and a tightening nut 5, characterized in that the blind hole of the locking nut is made of The threaded hole and the trumpet-shaped locking hole are coaxially connected from the inside to the outside.

The tightening nut 5 is formed by coaxially connecting the locking portion 8 and the tensioning sealing portion 9. The tensioning sealing portion 9 is tapered and has the same taper as the trumpet-shaped locking hole of the locking nut 3. , the outer diameter of the large-diameter end of the tensioning seal portion 9 is smaller than the outer diameter of the locking portion 8, and the end of the tensioning sealing portion 9 is provided with at least three tensioning opening grooves 10 in a circumferential array, and the tensioning opening The groove 10 extends in the axial direction,

The tightening nut 5, the gasket 4 and the locking nut 3 are sequentially connected with the pump shaft 2, one end of the tightening nut 5 is in conflict with the impeller 1, and the other end is inserted into the same thread with the pump shaft 2 through the tightening seal portion 9. In the trumpet-shaped locking hole of the connected lock nut 3, the lock nut 3 is screwed in sequence, so that the lock nut 3 presses and tightens the tensioning seal portion 9 of the tightening nut 5, and passes through the tensioning seal portion. The thread of 9 is closely matched with the thread on the pump shaft 2 and then sealed and pressed by the sealing gasket 4 to achieve the purpose of locking and sealing.

The sealing gasket 4 of the present invention adopts a tetrafluoroethylene sealing gasket to achieve the effect of high sealing performance.

The taper surface inclination of the flared locking hole of the locking nut 3 of the present invention is 10°-15°, and the present invention preferably adopts 12° to achieve high locking and sealing performance.

In the present invention, a washer 11 can also be sleeved on the pump shaft between the tightening nut and the impeller, so as to achieve the function of positioning the impeller through the washer.

When the utility model is installed, the washer 11 is firstly installed at the end of the pump shaft 2 where the impeller 1 is installed, and then the tightening nut 5 is installed to compress the washer 11 , and then the gasket 4 is set on the tensioning seal of the tightening nut 5 part 9, and finally screw into the locking nut 3, through the tightening of the locking nut 3 in turn, so that the locking nut 3 is pressed and tightened by the gasket 4 to tighten the tension sealing part 9 of the nut 5 to achieve the locking and sealing Action, the tension of the locking nut 3 by the tensioning sealing part 9 prevents the locking nut 3 from loosening during rotation, and the sealing effect is better and more remarkable through the sealing of the tetrafluoroethylene gasket 4 .

Because the utility model adopts the above structure, the utility model has the advantages of novel structure, convenient processing, low production cost, convenient and fast disassembly and assembly, high reliability of preventing loosening, and high sealing performance.

Claims (4)

1. An impeller nut anti-loose sealing device comprises an impeller, a pump shaft, a lock nut, a sealing gasket and a tightening nut, and is characterized in that the lock nut blind hole is formed by coaxially communicating a threaded hole and a trumpet-shaped locking hole from inside to outside,

the tightening nut is formed by coaxially and integrally connecting a locking part and a tensioning sealing part, the tensioning sealing part is conical and has the same taper as a horn-shaped locking hole of the locking nut, the outer diameter of the large end of the tensioning sealing part is smaller than the outer diameter of the locking part, at least 3 tensioning open grooves are arranged in a circumferential array of the end part of the tensioning sealing part, and extend along the axial direction,

the tightening nut, the sealing gasket and the locking nut are sequentially connected with the pump shaft, one end of the tightening nut is abutted to the impeller, the other end of the tightening nut is inserted into a horn-shaped locking hole of the locking nut which is also in threaded connection with the pump shaft through the tensioning sealing part, the locking nut is sequentially screwed, so that the tensioning sealing part of the tightening nut is compressed by the locking nut, and the tightening nut is tightly matched and plugged with a thread on the pump shaft through the thread of the tensioning sealing part and then is tightly compressed through the sealing gasket.

2. The anti-loose sealing device for the impeller nut as claimed in claim 1, wherein the gasket is a tetrafluoroethylene gasket.

3. The impeller nut loose-proof sealing device as claimed in claim 1 or 2, wherein the taper of the flared locking hole of the lock nut is 10 ° to 15 °.

4. The anti-loose sealing device for the impeller nut as claimed in claim 3, wherein the taper of the flared locking hole of the lock nut is 12 °.

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