CN210829743U

CN210829743U - Non-sealing multi-damping energy-saving double-end support two-stage centrifugal pump

Info

Publication number: CN210829743U
Application number: CN201921557579.6U
Authority: CN
Inventors: 高艳; 解凤江
Original assignee: Shenyang Tongda Water Pump Manufacturing Co ltd
Current assignee: Shenyang Tongda Water Pump Manufacturing Co ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-06-23
Anticipated expiration: 2029-09-19

Abstract

The utility model discloses an energy-saving bi-polar supporting two-stage centrifugal pump of no sealed many damping belongs to the centrifugal pump field. The front end of the pump body is provided with a bearing component A, the rear end of the bearing component A is connected with a rear pump cover, the rear pump cover is connected with the front end of a secondary impeller through a damping compensator, the rear end of the secondary impeller is connected with the front of the lower part of the pump body through the damping compensator, an interstage bushing and an interstage shaft sleeve are arranged at the bottom of the pump body, the interstage bushing is arranged above the interstage shaft sleeve, the rear end of the lower part of the pump body is connected with the front of a primary impeller through the damping compensator, and the rear of the primary impeller is connected with the front end of the front pump cover through the damping. Because the balance hole of the impeller is cancelled, the leakage loss of the rear opening ring of the impeller is completely recovered, the disc friction loss of the impeller part is eliminated, and the pump efficiency is improved. Because the mechanical sealing structure in the traditional centrifugal pump is cancelled, and the bracket is cancelled, the total length of the shaft is greatly shortened, the rigidity of the shaft is enhanced, and the safe operation coefficient of the pump is greatly improved.

Description

Non-sealing multi-damping energy-saving double-end support two-stage centrifugal pump

Technical Field

The utility model relates to an energy-saving bi-polar of no sealed many damping supports two-stage centrifugal pump belongs to centrifugal pump technical field.

Background

The centrifugal pump is a pump for conveying a liquid by a centrifugal force generated when an impeller rotates, and the centrifugal pump has various types according to uses. The existing two-stage centrifugal pump is a centrifugal pump which is applied more generally, and the centrifugal pump is widely applied to petroleum, chemical industry and electric power supply industry and generally has the following structural characteristics: the pump comprises two stages of single-suction impellers, wherein the impellers are provided with balance holes and front and rear opening rings to balance axial force; 2, adopting a double-end bearing support, and connecting the bearing with the pump body through a bearing bracket; 3, the pump is provided with two sets of mechanical sealing devices to prevent medium leakage, and the impeller is provided with a balance hole and utilizes a double-port ring structure to balance axial force.

According to the above structural characteristics of the existing two-stage centrifugal pump, the following defects can be seen: 1, a large amount of backflow loss is generated at the balance hole of the impeller and the front opening ring, so that efficiency loss is caused, the total loss efficiency is about 6-12%, and when the gap of the sealing ring is increased, the efficiency loss is more than 15%; 2, the pump has a longer integral structure and higher cost; 3, the sealing device increases the loss of the mechanical efficiency of the pump, and the sealing and flushing system of the pump needs a large amount of external water supply sources for flushing and cooling, so that the energy consumption is high; and 4, interstage leakage loss of the interstage shaft sleeve or the guide vane sleeve, wherein the loss generally accounts for 2-3% of the efficiency loss.

SUMMERY OF THE UTILITY MODEL

For solving among the prior art centrifugal pump balance hole produce a large amount of return losses, vibrate easily and lead to the reliability poor, sealing device increase energy consumption, interstage axle sleeve have the problem of stage leakage loss, the utility model provides an energy-saving bi-polar support two-stage centrifugal pump of no sealed many dampings, concrete scheme is as follows:

a non-sealing multi-damping energy-saving double-end supporting two-stage centrifugal pump is characterized in that the front end of the non-sealing multi-damping energy-saving double-end supporting two-stage centrifugal pump is a bearing component A, the rear end of the bearing component A is connected with a rear pump cover, the rear pump cover is connected with the front end of a secondary impeller through a damping compensator, the rear end of the secondary impeller is connected with the front of the lower portion of a pump body through the damping compensator, an interstage bushing and an interstage shaft sleeve are arranged at the bottom of the pump body, the interstage bushing is arranged above the interstage shaft sleeve, the rear end of the lower portion of the pump body is connected with the front of a primary impeller through the damping compensator, the rear end of the primary impeller is.

Preferably, the front section of the damping compensator is a shape-released first friction pair, a first cushion gasket is arranged at a groove of the first friction pair, and a first sealing ring is arranged in the first friction pair outside the connection part of the first friction pair and the first cushion gasket; the vice vertical one side of first friction is taken out and is connected with the vice level of shape second friction survey, and the vice vertical outside of surveying of second friction is connected with the sealed vertical side of gasket of the formation second of the right side of sealing, the sealed groove department of gasket of second sets up spring assembly, it sets up the locating pin not to be connected the side with the sealed pad of second buffering in the spring assembly, the spring assembly outside sets up the second sealing washer, first friction is vice with second grade impeller interference is connected, spring assembly with it connects to spit side pump cap interference.

Preferably, a positioning key is arranged below the bearing component B, the bearing component B is fixed on the positioning key through a positioning nut, a shaft is arranged behind the positioning key, the rear pump cover, the damping compensator, the pump body and the interstage bush are connected to form a stator component, and the primary impeller, the secondary impeller, the interstage shaft sleeve, the positioning key and the shaft are connected to form a rotor component.

Preferably, the interstage sleeve may be replaced with a damping compensator.

This use neotype beneficial effect lies in: because no sealing device is arranged, the axial length value of the bearing part supported at the two ends of the pump is reduced by about 40-50%, so that the strength of a pump rotor is improved, and the pump set runs more stably; the small back opening ring of the pump body impeller is removed, meanwhile, no balance water hole exists, efficiency loss and opening ring leakage loss caused by backflow of a recovery rate balance hole are avoided, meanwhile, after the impeller opening ring is replaced by a damping compensator, a large part of disc friction loss is recovered by an impeller back cover plate, and the overall efficiency of the pump is generally improved by 7-13% on the basis of conventional products; mechanical sealing parts and brackets are omitted from the pump body, the pump structure is simpler, and the equipment maintenance scheme is greatly simplified; pump body range of application is extensive, and special attenuator structure uses in most bi-polar support two-stage centrifugal water pump, and this type of product wide application is in agriculture, use, chemical industry, electric power and looks each individual trade such as screen, because pump body simple structure, overhauls and maintains the convenience, and energy-conserving effect is obvious.

Drawings

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

fig. 2 is a schematic structural diagram of a damping compensator according to an embodiment of the present invention.

In the figure: 1, a bearing component A; 2, a rear pump cover; 3, a secondary impeller; 4, an interstage bushing; 5, an interstage shaft sleeve; 6, a first-stage impeller; 7, positioning a nut; 8, a positioning key; 9, a damping compensator; 10, a shaft; 11, bearing component b; 12, a front pump cover; 13, a pump body.

Detailed Description

The materials, methods and apparatus used in the following examples, which are not specifically illustrated, are conventional in the art and are commercially available to those of ordinary skill in the art.

In the following description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and "upright" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the following description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection may be direct or indirect via an intermediate medium, or the connection may be internal to both components. To those of ordinary skill in the art, the specific meaning of the written terms in the present invention can be understood as a specific case.

In addition, in the following description of the present invention, the meaning of "a plurality", and "a plurality" is two or more unless otherwise specified.

The present invention will be described in further detail with reference to the accompanying drawings, but the following detailed description is not to be construed as limiting the present invention.

1, a bearing component A; 2, a rear pump cover; 3, a secondary impeller; 4, an interstage bushing; 5, an interstage shaft sleeve; 6, a first-stage impeller; 7, positioning a nut; 8, a positioning key; 9, a damping compensator; 10, a shaft; 11, bearing component b; 12, a front pump cover; 13, a pump body.

As shown in figure 1, a non-sealing multi-damping energy-saving double-end supporting two-stage centrifugal pump, the front end of which is a bearing component A1, the rear end of the bearing component A1 is connected with a rear pump cover 2, the rear pump cover 2 is connected with the front end of a second-stage impeller 3 through a damping compensator 9, the rear end of the second-stage impeller 3 is connected with the front part of the lower part of a pump body 13 through a damping compensator 9, the bottom of the pump body 13 is provided with an interstage bush 4 and an interstage shaft sleeve 5, the interstage bush 4 is arranged above the interstage shaft sleeve 5, the rear end of the lower part of the pump body 13 is connected with the front part of a first-stage impeller 6 through a damping compensator 9, the rear part of the first-stage impeller 6 is connected with the front end of a front pump cover 12 through a damping compensator 9, the rear end of the front pump cover 12 is connected with a bearing component B11, the lower part of the second-stage impeller 3 is provided with a positioning key 8, the bearing part B11 is connected with a front pump cover 12, a shaft 10 is arranged behind the positioning key 8, the rear pump cover 2, the damping compensator 9, the pump body 13, the front pump cover 12 and the interstage bush 4 are connected to form a stator part, and the primary impeller 6, the secondary impeller 3, the interstage shaft sleeve 5, the positioning key 8 and the shaft 10 are connected to form a rotor part.

As shown in fig. 2, the front section of the damping compensator 9 is a shape-released first friction pair 91, a first cushion gasket 93 is disposed at a groove of the first friction pair 91, and a first sealing ring 95 is disposed in the first friction pair 91 outside a connection between the first friction pair 91 and the first cushion gasket 93; the vertical side of the first friction pair 91 is connected with a suspension-shaped second friction pair 92 in a horizontal measuring mode, the outer side of the second friction pair 92 in the vertical measuring mode is connected with a linear second cushion sealing gasket 94 in the vertical measuring mode, a spring assembly 98 is arranged at the groove of the second cushion sealing gasket 94, a positioning pin 97 is arranged on the side, which is not connected with the second cushion sealing gasket 94, of the spring assembly 98, a second sealing ring 96 is arranged on the outer side of the spring assembly 98, the first friction pair 91 is in interference connection with the second-stage impeller 3, and the spring assembly 98 is in interference connection with the rear pump cover 2.

The working principle of the utility model is as follows: the bearing part plays a supporting role on the rotor, the stator part plays a supporting and protecting role on the rotor part, the pump body has a flow guiding role, and the rotor part plays a work boosting role on water when rotating. The damping compensator plays the role of axial force balance and sealing, and is provided with four damping compensators to replace an impeller sealing ring and a shell sealing ring.

When the pump works, the impeller rotates, the first-stage impeller boosts the sucked water, then the boosted water is led into the second-stage impeller through the guide vane, and the boosted water is output to the pipeline outside the pump through the water outlet of the shell. In the working process of the existing centrifugal pump, pressure is generated on a front cover plate and a rear cover plate of a first-stage impeller, and the front cover plate and the rear cover plate of the first-stage impeller are different in structure and area, so that the front cover plate and the rear cover plate are different from each other in pressure difference, and axial force is generated. Similarly, the secondary impeller will also generate an axial force.

In order to eliminate the influence of axial force, the first-stage impeller is provided with two damping compensators for replacing and the rear shell sealing ring and the first-stage rear impeller sealing ring, the second-stage impeller is provided with two damping compensators for replacing the second-stage rear shell sealing ring and the second-stage rear impeller sealing ring, and the two impellers are all cancelled with balance holes. The parts and the structure jointly form an axial force balancing device, most of axial force can be balanced, and in design, residual axial force is borne by the bearing component.

Because the balance hole of the impeller is cancelled, the leakage loss of the rear opening ring of the impeller is completely recovered, the disc friction loss of the impeller part is eliminated, and the pump efficiency is improved. Because the mechanical sealing structure in the traditional centrifugal pump is cancelled and the bracket is correspondingly cancelled, the total length of the shaft is greatly shortened, the rigidity of the shaft is enhanced, and the safe operation coefficient of the pump is greatly improved.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an energy-saving double-end support two-stage centrifugal pump of no sealed many dampings which characterized in that: the centrifugal pump comprises a centrifugal pump body, a pump cover, a damping compensator, a first bearing component, a second impeller, an interstage bushing and an interstage shaft sleeve, wherein the front end of the centrifugal pump body is a first bearing component, the rear end of the first bearing component is connected with the pump cover, the rear pump cover is connected with the front end of the second impeller through the damping compensator, the rear end of the second impeller is connected with the front of the lower portion of the pump body through the damping compensator, the bottom of the pump body is provided with the interstage bushing and the interstage shaft sleeve, the interstage bushing is arranged above the interstage shaft sleeve, the rear end of the lower portion of the pump body is connected with the front of the.

2. The sealless multi-damping energy saving double end supported two stage centrifugal pump of claim 1, wherein: the damping compensator is characterized in that the front section of the damping compensator is a shape-released first friction pair, a first buffer sealing gasket is arranged at a groove of the first friction pair, and a first sealing ring is arranged in the first friction pair outside the connection part of the first friction pair and the first buffer sealing gasket; the vice vertical one side of first friction is taken out and is connected with the vice level of shape second friction survey, and the vice vertical outside of surveying of second friction is connected with the sealed vertical side of gasket of the formation second of the right side of sealing, the sealed groove department of gasket of second sets up spring assembly, it sets up the locating pin not to be connected the side with the sealed pad of second buffering in the spring assembly, the spring assembly outside sets up the second sealing washer, first friction is vice with second grade impeller interference is connected, spring assembly with it connects to spit side pump cap interference.

3. The sealless multi-damping energy saving double end supported two stage centrifugal pump of claim 2, wherein: and a positioning key is arranged below the bearing part B, the bearing part B is fixed on the positioning key through a positioning nut, a shaft is arranged behind the positioning key, the rear pump cover, the damping compensator, the pump body and the interstage bush are connected to form a stator part, and the primary impeller, the secondary impeller, the interstage shaft sleeve, the positioning key and the shaft are connected to form a rotor part.

4. The sealless multi-damping energy saving double end supported two stage centrifugal pump of claim 2, wherein: the interstage shaft sleeve may be replaced with a damping compensator.