CN215634295U - Self-locking impeller nut - Google Patents

Abstract

The utility model provides a self-locking impeller nut which comprises a pump shaft, a pump impeller, a screw and an impeller nut, wherein the pump impeller is installed on the pump shaft through a key connection, the impeller nut is detachably installed at the end part of the pump shaft along the axial direction of the pump shaft, and the bottom of the impeller nut completely covers a fit clearance between the pump shaft and the pump impeller. Through the cooperation of screw and breach to guarantee that impeller nut and pump impeller can not produce relative rotation, prevent that the impeller nut pine from taking off.

Description

Self-locking impeller nut

Technical Field

The utility model relates to the field of centrifugal pumps, in particular to a self-locking impeller nut.

Background

The impeller nut of the centrifugal pump compresses the impeller tightly and seals the pump shaft at the same time, so that the liquid is prevented from being corroded due to the contact with the pump shaft. When pump system outlet check valve damaged, liquid refluence promoted the impeller reversal, and the impeller takes the axle reversal, because inertial action, the impeller nut will withdraw from, produces two serious consequences: after the nut is loosened, the impeller and the pump shell rub, and the shaft is twisted off when the impeller and the pump shell are serious; after the nut is loosened, the static seal fails, and liquid can leak from the shaft sleeve.

The prior art is generally:

1. the impeller nut is kept not to withdraw by the friction force of the end surface, and the impeller nut can fall off when the reverse rotation inertia force exceeds the friction force.

2. The impeller nut uses wedge threads to increase friction with the shaft threads and remain unremoved. This simply increases friction and thus reduces the chance of nut back-out and does not completely prevent the impeller nut from backing out.

3. The steel wire thread sleeve is lined, and the pressing force is increased, so that the friction force is increased. A further disadvantage of this method is the increased cost, the need to provide the user with a set of installation tools and several wire thread insert stock parts, which must be replaced after a single removal.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a self-locking impeller nut, so that the conditions of liquid leakage, shaft breakage and the like caused by withdrawing the impeller nut in the using process are prevented.

In order to achieve the purpose, the utility model provides a self-locking impeller nut which comprises a pump shaft, a pump impeller, a screw and an impeller nut, wherein the pump impeller is installed on the pump shaft through a key connection mode, the impeller nut is detachably installed at the end portion of the pump shaft along the axial direction of the pump shaft, and the bottom of the impeller nut completely covers a fit clearance between the pump shaft and the pump impeller.

Preferably, the internal thread of the impeller nut is a common fine thread.

Preferably, a sealing gasket is arranged between the bottom of the impeller nut and the end face of the pump impeller.

Preferably, the number of the notches formed in the bottom edge of the impeller nut is 6.

Preferably, the center of circle of each notch is located on the bottom edge of the impeller nut.

Preferably, the both sides at the bottom edge of impeller nut set up first groove district and second groove district respectively, first groove district is including clockwise first breach, second breach and the third breach that sets gradually, the second groove district is including clockwise fourth breach, fifth breach and the sixth breach that sets gradually.

Preferably, the second notch is arranged at a position where the first notch rotates clockwise by 30 degrees, and the third notch is arranged at a position where the second notch rotates clockwise by 30 degrees.

Preferably, the fourth notch is arranged at a position 105 degrees of clockwise rotation of the third notch, the fifth notch is arranged at a position 30 degrees of clockwise rotation of the fourth notch, and the sixth notch is arranged at a position 30 degrees of clockwise rotation of the fifth notch.

Preferably, the screw is a headless screw.

Compared with the prior art, the utility model has the advantages that:

1. the nut of the pump reverse rotation impeller can not be withdrawn, and the pump reverse rotation impeller is absolutely reliable.

2. The production cost is not obviously increased.

3. The installation operation is scientific and convenient.

Drawings

Fig. 1 is a front sectional view of the self-locking impeller nut and its assembly in the present invention.

Fig. 2 is a left side view of the end face of the pump impeller of the present invention.

Fig. 3 is a left side view of the impeller nut of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be further described below.

The utility model provides a self-locking impeller nut 4, which comprises a pump shaft 1, a pump impeller 2, a screw 3 and an impeller nut 4, wherein the pump impeller 2 is installed on the pump shaft 1 through a key connection, the impeller nut 4 is detachably installed at the end part of the pump shaft 1 along the axial direction of the pump shaft 1, the bottom of the impeller nut 4 completely covers a fit clearance 5 between the pump shaft 1 and the pump impeller 2, the purpose is to ensure the sealing of the position and prevent the water leakage caused by the water entering of the fit clearance 5 between the pump shaft 1 and the pump impeller 2, the end surface of the pump impeller 2 is provided with 4 screw holes 31 avoiding a key groove 6, the 4 screw holes 31 are orthogonally and crosswise distributed, the four screw holes 31 are sequentially arranged at intervals of 90 degrees clockwise around the center of the end surface of the impeller nut 4, a plurality of notches 8 are distributed at the edge of the bottom of the impeller nut 4, and the size of each notch 8 is the same as that of the screw holes 31, the screw 3 is mounted into the screw hole 31 through the notch 8.

In the concrete use, at first will have 4 pump impeller 2 of screw 31 to install on pump shaft 1 through the key-type connection, then install sealed 7, screw impeller nut 4 next, then through the breach 8 at impeller nut 4 bottom edge, screw 3 in the screw 31 of pump impeller 2 terminal surface, because the bottom edge of impeller nut 4 has set up breach 8, so the cooperation of screw 3 and breach 8 makes impeller nut 4 and pump impeller 2 unable relative motion, can only produce synchronous motion, so the impeller nut 4 that has just prevented impeller nut 4 because impeller nut 4 pine that produces when pump impeller 2 reverses takes off the production of phenomenon, impeller nut 4 pine takes off and can produce two serious consequences: 1. after the nut is loosened, the impeller and the pump shell rub, and the shaft is twisted off when the impeller and the pump shell are serious; 2. after the nut is loosened, the static seal fails, and liquid can leak from the shaft sleeve.

The internal thread of the impeller nut 4 is a common fine thread, and the fine thread is adopted because the sealing property and the self-locking property of the fine thread are better than those of a coarse thread, so that the impeller nut 4 which needs sealing and self-locking is more suitable.

A sealing gasket 7 is arranged between the bottom of the impeller nut 4 and the end face of the pump impeller 2, and the sealing gasket 7 is used for better sealing and reducing the abrasion between the impeller nut 4 and the pump impeller 2.

The breach 8 that impeller nut 4's bottom edge was established is 6, the centre of a circle of breach 8 all is located impeller nut 4's bottom edge, 6 breach 8 divide into 2 sets of settings, every group sets up 3 breach 8, be first groove district 81 and second groove district 82 respectively, first groove district 81 and second groove district 82 are the axisymmetric arrangement, first groove district 81 includes clockwise first breach 91 that sets gradually, second breach 92 and third breach 93, second groove district 82 includes clockwise fourth breach 94 that sets gradually, fifth breach 95 and sixth breach 96, separately set up two sets of 8 purposes of breach in order to let screw up impeller nut 4 after, have more breach 8 can correspond to at least one screw 31.

First, the position of the first notch 91 is arbitrarily determined, then the second notch 92 is disposed at a position where the first notch 91 is rotated clockwise by 30 °, and the third notch 93 is disposed at a position where the second notch 92 is rotated clockwise by 30 °. The fourth notch 94 is arranged at a position 105 degrees of clockwise rotation of the third notch 93, the fifth notch 95 is arranged at a position 30 degrees of clockwise rotation of the fourth notch 94, and the sixth notch 96 is arranged at a position 30 degrees of clockwise rotation of the fifth notch 95, so that after the arrangement, for four screw holes 31 which are arranged in an orthogonal cross shape, no matter any number of turns and any angle of screwing are carried out when the impeller nut 4 is screwed, at least one notch 8 can be found to correspond to the screw hole 31, and the error is within 2 degrees.

The screw 3 is a headless screw 3, and after the headless screw 3 is screwed down, the position of the nail head can be ensured to be positioned in the notch 8 of the impeller nut 4, so that the impeller nut 4 and the pump impeller 2 cannot rotate relatively, and the rotation resistance generated after the screw is screwed in the nut is reduced.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (9)

1. The utility model provides a from locking-type impeller nut, includes pump shaft, pump impeller, screw and impeller nut, the pump impeller passes through the key-type connection and installs on the pump shaft, the impeller nut is followed the axial detachably of pump shaft is installed the tip of pump shaft, the bottom of impeller nut will the pump shaft with cooperation clearance between the pump impeller covers completely, its characterized in that, the terminal surface of pump impeller is avoided the keyway and is provided with 4 screws, 4 the screw is the cross distribution of quadrature, a plurality of breachs of bottom edge distribution of impeller nut, the size of breach with the screw size is the same, the screw passes through the breach is installed in the screw.

2. The self-locking impeller nut of claim 1, wherein the impeller nut internal threads are plain fine threads.

3. The self-locking impeller nut of claim 1, wherein a seal is provided between the bottom of the impeller nut and the end face of the pump impeller.

4. The self-locking impeller nut of claim 1, wherein the number of the notches provided at the bottom edge of the impeller nut is 6.

5. The self-locking impeller nut of claim 4, wherein the center of the circle of each of the indentations is located on the bottom edge of the impeller nut.

6. The self-locking impeller nut of claim 5, wherein a first groove area and a second groove area are respectively arranged on two sides of the bottom edge of the impeller nut, the first groove area comprises a first notch, a second notch and a third notch which are sequentially arranged clockwise, and the second groove area comprises a fourth notch, a fifth notch and a sixth notch which are sequentially arranged clockwise.

7. The self-locking impeller nut of claim 6, wherein the second notch is disposed at a 30 ° clockwise position of the first notch and the third notch is disposed at a 30 ° clockwise position of the second notch.

8. The self-locking impeller nut of claim 7, wherein the fourth notch is disposed 105 ° clockwise of the third notch, the fifth notch is disposed 30 ° clockwise of the fourth notch, and the sixth notch is disposed 30 ° clockwise of the fifth notch.

9. The self-locking impeller nut of claim 1, wherein the screw is a headless screw.

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