CN111852885A

CN111852885A - High-efficiency single-stage coaxial centrifugal pump without sealing and axial force

Info

Publication number: CN111852885A
Application number: CN201910361390.8A
Authority: CN
Inventors: 解凤江; 高艳; 马西伟
Original assignee: Shandong Hengquan Energy Technology Co ltd
Current assignee: Shandong Hengquan Energy Technology Co ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-10-30

Abstract

The invention relates to the technical field of centrifugal water pump equipment, in particular to a non-sealing non-axial-force high-efficiency single-stage coaxial centrifugal pump which comprises a pump body, a shell component consisting of a pump cover, an impeller nut, an impeller, a rotor component consisting of a motor shaft and a voltage stabilizer, wherein a damping compensator is arranged between the rotor component and the shell component, a rotor protection plate is arranged on the rotor component, the motor shaft is connected with a motor, the voltage stabilizer is arranged at an impeller suction port ring, and the voltage stabilizer consists of a base, a balance water pipe and a thrust disc. The invention has the beneficial effects that: the pump efficiency is improved, the stability is greatly improved, and the pump set is more stable in operation.

Description

High-efficiency single-stage coaxial centrifugal pump without sealing and axial force

Technical Field

The invention relates to the technical field of centrifugal water pump equipment, in particular to a non-sealing and non-axial-force high-efficiency single-stage coaxial centrifugal pump.

Background

The existing single-stage centrifugal pump is the most widely used centrifugal pump, the pump is provided with a front sealing ring and a rear sealing ring, the impeller is provided with a balance hole, and the axial force generated by the impeller is balanced through the combined action of the front sealing ring, the rear sealing ring and the balance hole. Mechanical seals are provided to prevent axial leakage of the rotor.

Structural defects: when the balance hole, the front sealing ring and the rear sealing ring structure balance the axial force, a large amount of backflow of the balance hole is caused, and more leakage loss of the mouth ring is generated. Meanwhile, after the balance hole balances the axial force, residual axial force is generated and needs to be borne by the thrust bearing. When the working condition changes or the gap of the opening ring is increased, the axial force is increased, and hidden danger is caused to the safe and stable operation of the pump. The mechanical sealing device increases the mechanical efficiency loss of the pump, and the sealing and flushing system of the pump needs a large amount of external water supply for cooling, so that the energy consumption is high;

disclosure of Invention

In order to solve the problems in the prior art, the invention provides the high-efficiency single-stage coaxial centrifugal pump which has a simple structure and can improve the pump efficiency and has no seal and axial force.

The technical scheme of the invention is as follows:

the utility model provides a do not have sealed, high-efficient single-stage coaxial centrifugal pump of no axial force, includes the pump body, rotor part and the stabiliser that housing part, impeller nut, impeller, motor shaft constitution that the pump cover is constituteed, rotor part and housing part between set up the damping compensator, the rotor part on be equipped with the rotor guard plate, the motor shaft connect the motor, the damping compensator include vice A of friction, the vice B of friction, one side of vice A of friction be equipped with the buffer seal pad A, the opposite side of buffer seal pad A be equipped with sealing washer A, one side of vice B of friction be equipped with buffer seal pad B, the opposite side of buffer seal pad B be equipped with spring assembly, spring assembly on be equipped with the locating pin, one side of spring assembly be equipped with sealing washer B, the stabiliser install in impeller suction opening ring department, the stabiliser by base, the motor shaft, Balance water pipe, thrust dish are constituteed.

The motor shaft is coaxially connected with the impeller.

And a front cover plate and a rear cover plate are arranged on two sides of the pump cover.

The technical scheme provided by the invention has the beneficial effects that:

high efficiency: the pump impeller is a balance-free water hole type high-efficiency impeller, so that the efficiency loss caused by the backflow of a balance hole is eliminated, meanwhile, after the damping compensator replaces an impeller opening ring, the impeller rear cover plate reduces a large part of the friction loss of a disc, and the overall efficiency of the pump is generally improved on the basis of conventional products (particularly suitable for low-specific-speed centrifugal pumps).

And II, stability: the pressure stabilizing assembly ensures that the pump rotor has no axial force and only bears radial force. Simultaneously, the axle is stretched for a short time, and the rigidity of axle is good, and pump package stability greatly improves: because no sealing device is arranged, the axial space of the pump is compressed by 80-150 lengths, and the length L value of the rotor part of the pump is reduced by about 30-50%. Therefore, the strength of the pump rotor is improved, and the pump set runs more stably.

Three maintenance simplicity: the pump with the structure eliminates mechanical seal, the pump structure is simpler, and the equipment maintenance scheme is greatly simplified.

Fourthly, the economy is as follows: the pump has wide application range. The special damping compensator and the pressure stabilizing component are widely suitable for single-stage centrifugal pumps, and the products are widely applied to agriculture, petroleum, chemical industry, electric power, food and other industries.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of the present invention.

FIG. 2 is a schematic diagram of the damping compensator of the present invention.

Fig. 3 is a schematic diagram of the voltage regulator according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-3, a non-sealing, non-axial force high-efficiency single-stage coaxial centrifugal pump includes a pump body 1, a housing component composed of a pump cover 3, an impeller nut 4, an impeller 6, a rotor component composed of a motor shaft 7, and a stabilizer 2, a damping compensator 5 is disposed between the rotor component and the housing component, a rotor guard plate 8 is disposed on the rotor component, the motor shaft 7 is connected to a motor 10, the damping compensator 5 includes a friction pair a12 and a friction pair B11, the friction pair a12 and the friction pair B11 play roles of preventing medium leakage and balancing axial force, a buffer gasket a13 is disposed on one side of the friction pair a12, a seal ring 14 is disposed on the other side of the buffer gasket a13, a buffer gasket B16 is disposed on one side of the friction pair B11, a spring assembly 15 is disposed on the other side of the buffer gasket B16, and the spring assembly 15 plays a role of providing the friction pair a12, The vice B11 pretightning force of friction to produce the damping force, spring assembly 15 on be equipped with locating pin 7, play the location and prevent changeing the effect, one side of spring assembly 15 be equipped with sealing washer B8, stabiliser 2 install in impeller suction opening ring department, stabiliser 5 constitute by base 19, balanced water pipe 20, thrust disc 21.

The motor shaft 7 is coaxially connected with the impeller.

And a front cover plate 22 and a rear cover plate 23 are arranged on two sides of the pump cover 3.

The impeller 6 rotates, the impeller 6 boosts the pressure of the sucked water and then drives out the water outlet, pressure is generated on the front cover plate 22 and the rear cover plate 23 at the moment, and the front cover plate 22 and the rear cover plate 23 have different structures and different areas, so that pressure difference exists between the front cover plate and the rear cover plate, and axial force is generated.

Under the combined action of the voltage stabilizer 2 and the damping compensator 5, the axial force and residual axial force generated by the front cover plate and the rear cover plate of the impeller 6 are eliminated, and the rotor is not subjected to the axial force and only bears the radial force.

The damping compensator 5 eliminates the leakage loss of the conventional balance hole.

The damping compensator 5 simultaneously acts as an axial seal. Preventing axial medium leakage.

Because no medium is filled in the area between the rear cover plate damping compensator and the shaft diameter, the friction loss of partial disks of the rear cover plate 23 is eliminated. Further improving the efficiency of the pump. And partial disc friction losses.

The motor shaft 7 and the impeller are coaxially connected (directly connected), so that the rigidity and the operation stability of the pump rotor are improved, and the reliability of the pump is greatly improved.

Mounting position of damping compensator 5: the damping compensator replaces the original impeller opening ring or guide vane bushing position or the casing interstage bushing position. The installation position is the same as the original impeller collar position or the guide vane bushing position or the casing interstage jacketed position.

Cushion seal a13, seal a14, spring assembly 15 and cushion seal B16 function to seal and reduce impact forces.

The sealing ring A14, the spring assembly 15, the buffer sealing gasket B16 and the positioning pin 17 are static sealing elements.

The working principle of the voltage stabilizer is as follows:

during operation of the pump, the balance tube 20 receives high pressure water from the pump outlet and delivers it to the thrust disc 21 via the base 19. And generates a thrust to the impeller 6 side to offset the axial force generated by the rotor and directed to the suction port direction and the axial thrust (F) generated by the spindle head. When the pressure of the end face of the thrust disc 21 is larger than the axial force (F) of the rotor, the rotor generates axial deflection towards the coupling side, so that the axial force generated by the thrust disc 21 is reduced until the axial force value is equal to the axial force value of the rotor, and the rotor operates in a state without axial force. The voltage stabilizer 2 has a dynamic automatic voltage stabilizing function, so that the axial force of the rotor is always in a balanced state (the balance effect of the balance disc axial force balance mechanism is achieved).

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a high-efficient single-stage coaxial centrifugal pump of sealless, no axial force, its characterized in that includes pump body, pump cover component, impeller nut, impeller, the rotor part and the stabiliser that the motor shaft constitutes, rotor part and housing part between set up the damping compensator, the rotor part on be equipped with the rotor guard plate, the motor shaft connect the motor, the damping compensator include vice A of friction, the vice B of friction, one side of vice A of friction be equipped with the buffer seal pad A, the opposite side of buffer seal pad A be equipped with sealing washer A, one side of vice B of friction be equipped with buffer seal pad B, the opposite side of buffer seal pad B be equipped with spring assembly, spring assembly on be equipped with the locating pin, one side of spring assembly be equipped with sealing washer B, the stabiliser install impeller suction opening ring department, the pressure stabilizer consists of a base, a balance water pipe and a thrust disc.

2. A sealless, axially force free high efficiency single stage coaxial centrifugal pump according to claim 1, wherein the motor shaft is coaxially coupled to the impeller.

3. A sealless, axial force free high efficiency single stage coaxial centrifugal pump according to claim 1, wherein the pump cover is provided with a front cover plate and a back cover plate on both sides.