CN211144820U

CN211144820U - Two-stage single-suction double-support centrifugal pump

Info

Publication number: CN211144820U
Application number: CN201922113278.0U
Authority: CN
Inventors: 陈杰; 张伟; 丁江波; 池武; 许秦伟; 余飞腾
Original assignee: Zhejiang Keer Pump Stock Co ltd
Current assignee: Zhejiang Keer Pump Stock Co ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-07-31
Anticipated expiration: 2029-11-19

Abstract

The utility model discloses a two-stage single suction double bracing formula centrifugal pump, including the pump body, initial cover, tail-hood, support frame, bearing part, rotor part, the rotor part includes first impeller, secondary impeller, pivot, first impeller, secondary impeller correspond the both sides of adorning at the pump body respectively in the pivot and at the side department of secondary impeller the circular bead is equipped with in the pivot and at the side department of first impeller lock nut is equipped with. The utility model discloses a first-stage impeller, secondary impeller are packed into respectively, are separated by the both sides of the pump body, do not need former space bar and reduce the gap, make the pump body, head cover, tail-hood simple structure, and the middle runner is polished smoothly easily, has reduced leakage, has improved the pump efficiency. The distance between the shoulder on the rotating shaft and the locking nut is lengthened, the rotating shaft is in a prestretching state by utilizing opposite axial forces generated by the two impellers, and the total axial force of the pump compresses the bearing component, so that the pump can run more stably.

Description

Two-stage single-suction double-support centrifugal pump

Technical Field

The utility model relates to a centrifugal pump especially relates to a double bracing formula centrifugal pump.

Background

The double-support centrifugal pump is generally a two-end support structure with a flow rate of 50-1750 m³The pump head is 37-420 m in delivery lift, is mainly suitable for petroleum and products thereof and other chemical media in petrochemical industry, chemical industry and other occasions, and belongs to important equipment. The first-stage impeller is of a single-suction structure, usually the first-stage impeller and the last-stage impeller are installed in the pump body from the same side, and the two impellers are separated by a partition plate. The spacer plate is 320-550 mm in outer diameter and larger than the diameters of the two impellers, a gap is formed between the spacer plate and the pump body in a matching mode, the fluid leakage amount is large, and the efficiency of the centrifugal pump is reduced. And the two impellers are arranged in the pump body from the same side, the other side of the pump body is often made into a whole, the structure is complex, the casting is inconvenient, the error is large, the middle runner is not easy to polish, and the pump efficiency is low.

Disclosure of Invention

An object of the utility model is to overcome above not enough, and provide a primary impeller, secondary impeller respectively and between the casing gap little, the fluid let out the two-stage single suction double bracing formula centrifugal pump that the leakage quantity is few.

The purpose of the utility model is realized through the following technical scheme: two-stage single suction double bracing formula centrifugal pump, including the pump body, protecgulum, tail cover, sealed mechanical part, support frame, bearing part, rotor part, the rotor part includes first impeller, secondary impeller, pivot, first impeller, secondary impeller correspond the both sides of adorning at the pump body respectively the circular bead is equipped with in the pivot and in the side department of secondary impeller in the pivot and in the side department of first impeller lock nut is equipped with.

The rotary shaft is provided with a throttling bush between the pump body and the primary impeller and between the pump body and the secondary impeller, an impeller sealing ring is arranged between the throttling bush and the primary impeller, and a shell opening ring is arranged between the tail cover and the secondary impeller so as to enhance the sealing performance of the rotary shaft and cooperate with throttling.

Adopt the utility model discloses behind the structure, first-stage impeller, secondary impeller are packed into respectively, are separated by the both sides of the pump body, do not need former space bar and reduce the gap, make the pump body, head cover, tail-hood simple structure, casting convenient, and the middle runner is polished smoothly easily, has reduced and has let out leakage quantity, has improved pump efficiency 2 ~ 6%. The distance between the shoulder on the rotating shaft and the locking nut is lengthened, the rotating shaft is in a prestretching state by utilizing opposite axial forces generated by the two impellers, and the total axial force of the pump compresses the bearing component, so that the pump can run more stably.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic structural view of the two-stage single-suction double-support centrifugal pump of the present invention.

Detailed Description

Referring to fig. 1, the utility model discloses two-stage single suction double bracing formula centrifugal pump, including the pump body 5, first lid 4, tail-hood 8, mechanical seal part 3 (two about), support frame 10 (two about), bearing part 2 (two about), rotor part 1 includes first impeller 15, secondary impeller 13, pivot 18, first impeller 15, secondary impeller 13 correspond the both sides of adorning at the pump body 5 respectively (first impeller separates by the pump body with secondary impeller promptly, no longer need the space bar) shoulder 12 (be used for blockking the secondary impeller of location) is equipped with in pivot 18 and in side (right side) department of secondary impeller 13 on pivot 18 and in side (left side) department of first impeller 15 be equipped with lock nut 17 (locking first impeller).

Wherein, the pump body 5 (one part) and the head cover 4 form a fluid inlet part, and the pump body 5 (the other part) and the tail cover 8 form a fluid outlet part. A shaft sleeve 16 is arranged between the primary impeller 15 and the rotating shaft 18, a throttling bush 14 is arranged on the rotating shaft 18 and between the pump body 5 and the primary impeller 15 and the secondary impeller 13, an impeller sealing ring 6 is arranged between the throttling bush 14 and the primary impeller 15, and a shell opening ring 7 is arranged between the tail cover 8 and the secondary impeller 13. The fluid overflowing part is as follows: the pump comprises a head cover 4, a pump body 5, a tail cover 8, a primary impeller 15 and a secondary impeller 13; the primary impeller 15 and the secondary impeller 13 are separated by the pump body 5, and in the operation of the centrifugal pump, fluid flows into the primary cover 4 through the inlet, flows into the pump body 5 through the primary impeller 15 in sequence, is guided to the tail cover 8, and is discharged through the secondary impeller 13. The fluid inlet part of the first-stage impeller consists of a pump body 5 and a head cover 4, the structure is simple, the casting is easy, the casting precision is improved, the design requirement can be better met, and the product quality is controlled; the primary impeller 15 and the secondary impeller 13 are separated by the pump body 5, interstage leakage is avoided, the primary impeller and the secondary impeller are in clearance fit with the throttling bush 14, flow channeling is prevented, flow loss is reduced, pump efficiency is improved by 2-6%, and energy consumption is saved.

The axial force generated by the primary impeller is to the left, which is less than the rightward axial force generated by the secondary impeller. The left and right axial forces respectively form tensile stress at the shoulder 12 and the locking nut 17 on the rotating shaft, the axial distance between the shoulder and the locking nut is long, so that the rotating shaft is in a pre-stretched state, and when the temperature of the rotating shaft rises, the residual axial force is born by the bearing part on the right side, so that the pump runs more stably and the service life is longer.

Claims

1. Two-stage single suction double bracing formula centrifugal pump, including the pump body, head cover, tail cover, sealed mechanical part, support frame, bearing part, rotor part, the rotor part includes first impeller, secondary impeller, pivot, its characterized in that: the primary impeller and the secondary impeller are respectively and correspondingly arranged on two sides of the pump body, shoulders are arranged on the rotating shaft and at the side edge of the secondary impeller, and locking nuts are arranged on the rotating shaft and at the side edge of the primary impeller.

2. The two-stage single suction double support centrifugal pump of claim 1, wherein: and a throttling bush is arranged on the rotating shaft and between the pump body and the primary impeller and the secondary impeller, an impeller sealing ring is arranged between the throttling bush and the primary impeller, and a shell opening ring is arranged between the tail cover and the secondary impeller.