CN214404090U

CN214404090U - Locking device of large-flow single-stage centrifugal pump impeller

Info

Publication number: CN214404090U
Application number: CN202023263405.4U
Authority: CN
Inventors: 葛靖; 罗工作; 王国华; 段江龙
Original assignee: Shandong Shuanglun Co Ltd
Current assignee: Shandong Shuanglun Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-10-15
Anticipated expiration: 2030-12-29

Abstract

The utility model discloses a locking device of a large-flow single-stage centrifugal pump impeller, which comprises a pump shaft, an impeller and an impeller nut, and is characterized by also comprising an impeller screw, a set screw and a sealing ring, wherein the end part of the pump shaft is provided with an external thread section, and the end surface is provided with an internal thread blind hole along the axis, so that the axes of the external thread section and the internal thread blind hole are superposed, the pitch of the external thread section is different from that of the internal thread blind hole, and the screwing direction is the same, after the impeller nut is in threaded connection with the external thread section of the pump shaft through a fastening threaded hole, one end surface is fixed against the impeller through the sealing ring, the other end is fixed against the end surface of an impeller screw crown through the sealing ring, the screw hole of the impeller screw passing through the impeller nut is in threaded connection with the internal thread blind hole of the pump shaft through a screw rod, the impeller screw is fixed with the impeller nut through the set screw and is limited, the utility model has the advantages of compact structure, stable operation, few faults, high working efficiency, convenient installation, etc.

Description

Locking device of large-flow single-stage centrifugal pump impeller

Technical Field

The utility model relates to a fluid machinery technical field, specific locking device of the large-traffic unit centrifugal pump impeller of aiming at petrochemical, industry, agricultural, municipal water, domestic water in saying so one-way.

Background

The locking device of the impeller is an important component in a single-stage centrifugal pump and has the function of locking the impeller to prevent the impeller from falling off. The conventional common impeller locking device consists of an impeller nut and a gasket, and the impeller nut is prevented from loosening and falling off by the fact that the screw thread turning direction of the impeller nut is opposite to the pump shaft turning direction.

At present, because the locking device of impeller nut plus gasket is simple, with low costs, so most single-stage centrifugal pumps adopt this kind of device, this kind of device can satisfy the needs when the pump is less, but along with the promotion of pump manufacturing technology, a lot of large-traffic single-stage centrifugal pumps are put into market, this kind of locking device has very big hidden danger, large-traffic pump medium refluence can arouse the impeller reversal when the pump is shut down, and large-traffic pump impeller and impeller nut are heavier, inertia is big, can accelerate the not hard up of impeller nut and even drop when the impeller reverses.

Through retrieval, the CNCN 212055248U discloses a centrifugal pump impeller nut structure, which comprises a shaft, an impeller and an impeller nut, wherein the shaft, the impeller and the impeller nut are installed in a pump body, two sections of threads with different rotation directions are arranged at the end part of the shaft, the impeller nut comprises a left-handed impeller nut and a right-handed impeller nut, the left-handed impeller nut is installed inside the shaft close to the impeller, and the right-handed impeller nut is installed outside the shaft in a manner of clinging to the left-handed impeller nut; the locking structure has great hidden trouble, namely, when the pump of the centrifugal pump with large flow rate is stopped, the medium flows backwards to cause the impeller to rotate reversely, the pump impeller with large flow rate and the impeller nut with large flow rate are heavy, the inertia is large, the loosening of the right-handed impeller nut can be accelerated when the impeller rotates reversely, after the right-handed impeller nut is loosened, the loosening of the left-handed impeller nut is accelerated when the impeller rotates forwards, and further the impeller is loosened until the impeller falls off, so that the medium enters the device, the equipment has frequent failure, high maintenance frequency, low working efficiency and unstable operation.

Disclosure of Invention

The utility model aims at solving the deficiencies of the prior art, providing a locking device of large-traffic single-stage centrifugal pump impeller that compact structure, operation are stable, the trouble is few, work efficiency is high, simple to operate.

The utility model provides a technical scheme that its technical problem adopted is:

the locking device of the impeller of the large-flow single-stage centrifugal pump comprises a pump shaft, the impeller and an impeller nut, and is characterized by further comprising an impeller screw, a set screw and a sealing ring, wherein an external thread section is arranged at the end part of the pump shaft, an internal thread blind hole is formed in the end surface of the pump shaft along the axis, so that the axes of the external thread section and the internal thread blind hole are superposed, the pitch of the external thread section is different from that of the internal thread blind hole, the screwing direction is the same, a screw through hole and a fastening screw hole are sequentially formed in the axis of the impeller nut, a positioning blind hole is formed in the end surface of the impeller nut on one side of the screw through hole, one end surface of the impeller nut is in butt seal fixation with the impeller through the sealing ring after the screw through hole is in the screw thread connection with the external thread section of the pump shaft, the other end surface of the impeller nut is in butt seal fixation with the end surface of the impeller nut through the sealing ring through the screw through the seal ring, the medium is prevented from entering the device, the screw through the blind hole in thread connection with the pump shaft, because the axle center coincidence of external screw thread section and internal thread blind hole, just the pitch of external screw thread section is inequality with the pitch of internal thread blind hole, the direction of rotation is the same, consequently, has stopped impeller nut and impeller screw and has become flexible simultaneously or drop in corotation or medium refluence, the impeller screw is fixed spacing through holding screw and impeller nut to reach the effect that prevents impeller screw and become flexible or drop.

The pitch of external screw thread section is greater than the pitch of internal thread blind hole to reach the effect of increase impeller nut to the locking force of impeller.

The utility model discloses owing to adopt above-mentioned structure, have compact structure, operation stable, the trouble is few, work efficiency is high, advantages such as simple to operate.

Drawings

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

Reference numerals: the pump shaft 1, the impeller 2, the impeller nut 3, the impeller bolt 4, the set screw 5, the

seal rings

6 and 7, the thread section 11, the internal thread blind hole 12, the screw through hole 31, the fastening threaded hole 32 and the positioning blind hole 33.

Detailed Description

The present invention will be described with reference to the accompanying drawings and examples.

As shown in the attached drawings, the locking device of the large-flow single-stage centrifugal pump impeller comprises a pump shaft 1, an impeller 2 and an impeller nut 3, and is characterized by further comprising an impeller screw 4, a set screw 5 and

sealing rings

6 and 7, wherein an external thread section 11 is arranged at the end part of the pump shaft 1, an internal thread blind hole 12 is arranged on the end surface along the axis, so that the axis of the external thread section 11 is superposed with the axis of the internal thread blind hole 12, the thread pitch of the external thread section 11 is different from that of the internal thread blind hole 12, the rotation direction is the same, a screw through hole 31 and a fastening thread hole 32 are sequentially arranged on the impeller nut 3 along the axis, a positioning blind hole 33 is arranged on the end surface of the impeller nut 3 at one side of the screw through hole 31, after the impeller nut 3 is in threaded connection with the external thread section 11 of the pump shaft through the fastening thread hole 32, one end surface is in abutting sealing fixation with the impeller 2 through the sealing ring 6, and the other end surface is in abutting sealing fixation with the screw crown end surface of the impeller screw 4 through the sealing ring 7, inside avoiding medium access device, the screw perforation that impeller screw 4 screw section passed impeller nut 3 is through screw rod and pump shaft 1's internal thread blind hole 12 threaded connection, because the axle center coincidence of external screw thread section 11 and internal thread blind hole 12, just the pitch of external screw thread section 11 is inequality with the pitch of internal thread blind hole 12, the direction of rotation is the same, consequently, has stopped that impeller nut 3 and impeller screw 4 are not hard up or drop simultaneously when corotation or medium refluence, impeller screw 4 is fixed spacing through holding screw 5 and impeller nut 3 to reach the effect that prevents that the impeller screw from becoming flexible or dropping.

The pitch of external screw thread section 11 is greater than the pitch in the blind 12 holes of internal thread to reach the effect of the locking force of increase impeller nut to the impeller.

The utility model discloses at the during operation, the pump shaft drives the impeller high-speed rotation, and the medium passes through the impeller and pumps, and under centrifugal operating condition, the impeller screw is locked on impeller nut through holding screw, has prevented not hard up or drop of impeller screw, because the axle center coincidence of external screw thread section 11 and internal thread blind hole 12, just the pitch of external screw thread section 11 is inequality with the pitch of internal thread blind hole 12, the precession is the same for impeller nut and impeller screw have formed the auto-lock jointly, consequently, have stopped that impeller nut 3 and impeller screw 4 are not hard up simultaneously or drop when corotation or medium refluence, have greatly improved the stability of equipment operation.

Claims

1. The locking device of the impeller of the large-flow single-stage centrifugal pump comprises a pump shaft, an impeller and an impeller nut, and is characterized by further comprising an impeller screw, a set screw and a sealing ring, wherein an external thread section is arranged at the end part of the pump shaft, an internal thread blind hole is formed in the end surface of the pump shaft along the axis, so that the axes of the external thread section and the internal thread blind hole are superposed, the pitch of the external thread section is different from that of the internal thread blind hole, the screwing direction is the same, a screw through hole and a fastening screw hole are sequentially formed in the axis of the impeller nut, a positioning blind hole is formed in the end surface of the impeller nut on one side of the screw through hole, one end surface of the impeller nut is in butt seal fixation with the impeller through the sealing ring, the other end of the impeller nut is in butt seal fixation with the end surface of an impeller screw crown through the sealing ring, and the screw through hole of the impeller nut is in screw through screw in screw thread connection with the internal thread blind hole of the pump shaft, the impeller screw is fixed and limited with the impeller nut through the set screw.

2. The locking device for the impeller of the single-stage centrifugal pump for large flows according to claim 1, wherein the thread pitch of the male threaded section is greater than the thread pitch of the female threaded blind hole.