CN210829741U - Non-sealing energy-saving double-end support two-stage centrifugal pump - Google Patents

Abstract

The utility model discloses a there is not energy-saving bi-polar of sealing support two-stage centrifugal pump belongs to centrifugal pump technical field bearing part rear end and back pump cover are connected, back pump cover bottom is passed through damping compensator and second grade impeller connection, back pump cover top and pump body coupling, second grade impeller rear end sets up second grade procapsid sealing ring, second grade procapsid sealing ring below corresponds and sets up second grade procapsid sealing ring, pump body bottom sets up stage bush, stage bush below sets up stage shaft sleeve, pump body rear side is through one-level procapsid sealing ring and one-level impeller connection, one-level impeller corresponds the setting with the second grade impeller pump body below, one-level procapsid sealing ring below corresponds and sets up one-level preceding impeller sealing ring, one-level impeller rear end is connected with the damping compensator. The problems that a balance hole of the centrifugal pump generates a large amount of backflow loss, the reliability is poor due to easy vibration, and the energy consumption of the sealing device is increased are solved.

Description

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

Technical Field

The utility model relates to a there is not sealed energy-saving bi-polar to support 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 two-stage centrifugal pump is a centrifugal pump which is widely applied at present and is widely applied to petroleum and chemical industry. The two-stage centrifugal pump at the present stage has the following 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; and 3, the pump body is provided with two sets of mechanical sealing devices to prevent the medium leakage, and the impeller is provided with a balance hole and utilizes a double-opening ring structure to balance the axial force.

According to the structural characteristics of the existing centrifugal pump, the existing centrifugal pump has the following disadvantages: 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 mechanical efficiency loss of the metering pump, and the sealing and flushing system needs a large amount of external water supplies for flushing and cooling, so that the energy consumption is high.

SUMMERY OF THE UTILITY MODEL

For solving among the prior art centrifugal pump balancing hole produce a large amount of return losses, vibrate easily and lead to the problem that the reliability is poor, sealing device increases energy consumption, the utility model provides a no sealed energy-saving bi-polar supports two-stage centrifugal pump, concrete scheme is as follows:

a non-sealing energy-saving two-stage centrifugal pump with double end supports is provided, the front end is a bearing component A, the rear end of the bearing component is connected with a rear pump cover, the bottom of the rear pump cover is connected with the secondary impeller through a damping compensator, the top of the rear pump cover is connected with the pump body, the rear end of the second-stage impeller is provided with a second-stage front impeller sealing ring, a second-stage front impeller sealing ring is correspondingly arranged below the second-stage front impeller sealing ring, an interstage bushing is arranged at the bottom of the pump body, an interstage shaft sleeve is arranged below the interstage bushing, the rear side of the pump body is connected with a primary impeller through a primary front housing sealing ring, the first-stage impeller and the second-stage impeller are correspondingly arranged below the pump body, a first-stage front impeller sealing ring is correspondingly arranged below the first-stage front casing sealing ring, the rear end of the first-stage impeller is connected with the damping compensator, the rear side of the pump body is connected with a bearing component B, and the front end of the bearing component B is connected with the front pump cover.

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 vertical side of the first friction pair is connected with the horizontal side of the second friction pair in a shape-shifted manner, the outer side of the second friction pair in the vertical side of the second friction pair is connected with the vertical side of a second linear sealing gasket, a spring assembly is arranged at the groove of the second linear sealing gasket, a positioning pin is not arranged on the side, connected with the second linear sealing gasket, of the spring assembly, a second sealing ring is arranged on the outer side of the spring assembly, the first friction pair is in interference connection with the second-stage impeller, and the spring assembly is in interference connection with the front pump cover.

Preferably, the rear pump cover is fixed on a shaft through a positioning nut, the shaft is fixed on the ground through a positioning key, the rear pump cover, the damping compensator, the pump body, the interstage bushing and the first-stage front housing sealing ring form a stator component, and the second-stage impeller, the second-stage front housing sealing ring, the interstage shaft sleeve, the first-stage front impeller sealing ring, the first-stage impeller, the positioning nut, the positioning key and the shaft form a rotor component.

The utility model has the advantages that: because no sealing device is arranged, the axial length value between the bearings supported at the two ends of the pump body is reduced by about 40-50%, the strength of a pump rotor is improved, and the pump set runs more stably; the pump impeller is provided with a rear opening ring, a balance water hole is not formed, efficiency loss and opening ring leakage loss caused by backflow of the balance hole are recovered, meanwhile, after the impeller opening ring is replaced by a damping compensator, a large part of disc friction loss is recovered by an impeller rear cover plate, and the overall efficiency of the pump is generally improved by 7-13% on the basis of conventional products; the pump structure of the utility model cancels the mechanical sealing part and the bracket, the pump structure is simpler, and the equipment maintenance scheme is greatly simplified; special attenuator structure is suitable for most bi-polar support two-stage centrifugal water pump, and this type of product wide application is in agriculture and each individual trade such as use, chemical industry, electric power, food, because pump simple structure overhauls and maintains the convenience, and energy-conserving effect is obvious, and application prospect is extensive.

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, a pump body; 5, a secondary front housing seal ring; 6, a secondary front impeller sealing ring; 7, an interstage bushing; 8, an interstage shaft sleeve; 9, a damping compensator; 10, a primary front housing seal ring; 11, a primary front impeller sealing ring; 12, a first-stage impeller; 13, positioning a nut; 14, a positioning key; 15, a shaft; 16, bearing component b; and 17, a front pump cover.

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.

As shown in figure 1, a non-sealing energy-saving double-end support two-stage centrifugal pump, the front end of which is a bearing component A1, the rear end of the bearing component 1 is connected with a rear pump cover 2, the bottom of the rear pump cover 2 is connected with a second-stage impeller 3 through a damping compensator 9, the top of the rear pump cover 2 is connected with a pump body 4, the rear end of the second-stage impeller 3 is provided with a second-stage front-casing sealing ring 5, a second-stage front-impeller sealing ring 6 is correspondingly arranged below the second-stage front-casing sealing ring 5, the bottom of the pump body 4 is provided with an interstage bush 7, the interstage shaft sleeve 8 is arranged below the interstage bush 7, the rear side of the pump body 4 is connected with a first-stage impeller 12 through a first-stage front-casing sealing ring 10, the first-stage impeller 12 and the second-stage impeller 3 are correspondingly arranged below the pump body 4, a first, the rear side of the pump body 4 is connected with a bearing part B16, the front end of the bearing part B16 is connected with a front pump cover 17, the first-stage impeller 12 is fixed on a shaft 15 through a positioning nut 13, the rear pump cover 2, the damping compensator 9, the pump body 4, the interstage bush 7, the front pump cover 17 and the first-stage front shell sealing ring 10 form a stator part, and the second-stage impeller 3, the second-stage front impeller sealing ring 6, the interstage shaft sleeve 8, the first-stage front impeller sealing ring 11, the first-stage impeller 12, the positioning nut 13, the positioning key 14 and the shaft 15 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 supports the rotor, the stator part supports and protects the rotor, and the rotor part works and boosts water when rotating. The damping compensator plays a role in balancing axial force and sealing, and means that two damping compensators replace an impeller sealing ring and a shell sealing ring in the prior art.

When the pump works, the first-stage impeller boosts the sucked water, then the water is led into the second-stage impeller through the guide vane, and then the water is boosted by the second-stage impeller and then is output to the external pump pipeline through the water outlet of the shell. In the working process, 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 axial force influence, this use is novel the centrifugal pump sets up one-level procapsid sealing ring, corresponds and sets up one-level preceding impeller seal ring, sets up second grade procapsid sealing ring, corresponds and sets up second grade preceding impeller seal ring. The shell sealing ring and the stator component are connected or welded through a plurality of screws, and the impeller sealing ring and the impeller component are connected or welded through the screws. The damping compensator is arranged to replace a first-stage rear shell sealing ring, a first-stage rear impeller sealing ring, a second-stage rear shell sealing ring and a second-stage rear impeller sealing ring, and the two-stage 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 back opening ring of the impeller is completely recovered, the friction loss of the disk of the impeller part can be eliminated, and the pump efficiency is improved; because the damping compensator plays a role of mechanical sealing at the same time, the pump body of the utility model cancels a mechanical sealing structure in the traditional form, and simplifies the structure of the pump body; because the mechanical sealing structure in the traditional form is cancelled, and the structure correspondingly cancels the bracket, the total length of the shaft is greatly shortened, the rigidity of the shaft is enhanced, and the safe operation coefficient 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 (3)

1. The utility model provides a no sealed energy-saving bi-polar supports two-stage centrifugal pump which characterized in that: the centrifugal pump is characterized in that the front end of the centrifugal pump is a bearing component A, the rear end of the bearing component A is connected with a rear pump cover, the bottom of the rear pump cover is connected with a second-stage impeller through a damping compensator, the top of the rear pump cover is connected with a pump body, a second-stage front-housing sealing ring is arranged at the rear end of the second-stage impeller, a second-stage front-housing sealing ring is correspondingly arranged below the second-stage front-housing sealing ring, an interstage bushing is arranged at the bottom of the pump body, an interstage shaft sleeve is arranged below the interstage bushing, the rear side of the pump body is connected with a first-stage impeller through a first-stage front-housing sealing ring, the first-stage impeller is correspondingly arranged below the pump body, a first-stage front-impeller sealing ring is correspondingly arranged below the first-.

2. The sealless 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 vertical side of the first friction pair is connected with the horizontal side of the second friction pair in a shape-shifted manner, the outer side of the second friction pair in the vertical side of the second friction pair is connected with the vertical side of a second linear sealing gasket, a spring assembly is arranged at the groove of the second linear sealing gasket, a positioning pin is not arranged on the side, connected with the second linear sealing gasket, of the spring assembly, a second sealing ring is arranged on the outer side of the spring assembly, the first friction pair is in interference connection with the second-stage impeller, and the spring assembly is in interference connection with the front pump cover.

3. The sealless energy saving double end supported two stage centrifugal pump of claim 2, wherein: the rear pump cover is fixed on a shaft through a positioning nut, the shaft is fixed on the ground through a positioning key, the rear pump cover, the damping compensator, the pump body, the interstage bush and the first-stage front shell sealing ring form a stator component, and the second-stage impeller, the second-stage front sealing ring, the interstage shaft sleeve, the first-stage front impeller sealing ring, the first-stage impeller, the positioning nut, the positioning key and the shaft are made into a rotor component.

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