CN115853819A - A horizontal double-suction centrifugal pump supported by water guide bearings - Google Patents

Abstract

The invention relates to a horizontal double-suction centrifugal pump supported by water guide bearings. The throat of the pump body and pump cover of the centrifugal pump is provided with a bearing cavity to install a bearing group. The non-driving end uses a combination of water guide bearings and thrust bearings. The driving end uses a water guide bearing, and the surface of the water guiding bearing and the thrust bearing is attached to a polymer material. Both the driving end and the non-driving end adopt a structure in which high-pressure water is drawn from the pressure water chamber of the pump cover for cooling and lubrication; the non-driving end has no shaft seal and adopts Static sealing method, the drive end uses a mechanical seal to seal the shaft. The invention simplifies the structure of the double-suction pump, reduces the number of parts of the single-stage double-suction horizontal split centrifugal pump, especially the number of vulnerable parts, has good sealing performance and is easy to install and maintain, and the bearing span is due to the fact that the water guide bearing is located on the pump cover of the pump body The throat is greatly reduced, the strength and rigidity of the rotor structure are improved, and the risk of shaft breakage in single-stage double-suction horizontal split centrifugal pumps is reduced.

Description

A horizontal double-suction centrifugal pump supported by water guide bearings

technical field

The invention relates to a horizontal double-suction centrifugal pump, in particular to a horizontal double-suction centrifugal pump supported by water guide bearings, which has a simple structure, fewer parts and wearing parts, good sealing performance, and is easy to install and maintain.

Background technique

Double-suction pumps are widely used in various fields. The structure of double-suction pumps in the prior art is usually: the non-driving end and the driving end are equipped with shaft seal parts and bearing parts, and there is a gap between the shaft seal parts and bearing parts. This structure has the following problems: the pump shaft is long and the bearing span is large, so it is necessary to increase the shaft diameter to improve the strength of the pump shaft, which increases the cost and the risk of shaft breakage; the structure is complex, the number of parts is large, and the assembly time is long; when replacing the shaft sleeve When wearing parts such as machine seals and machine seals, it is necessary to disassemble the bearing parts, which brings great inconvenience to maintenance and replacement of wearing parts.

Contents of the invention

In view of the above problems, the main purpose of the present invention is to provide a horizontal double-suction centrifugal pump supported by water guide bearings with simple structure, few parts and wearing parts, good sealing performance and easy installation and maintenance.

The present invention solves the above-mentioned technical problems through the following technical solutions: a horizontal double-suction centrifugal pump supported by a water guide bearing, the horizontal double-suction centrifugal pump supported by a water guide bearing comprises: a pump body, a pump Cover, drive end, non-drive end.

The pump body of the centrifugal pump and the throat of the pump cover are provided with a bearing cavity for installing a water guide bearing. The non-driving end uses a combination of water guide bearing and thrust bearing, and the driving end uses a water guide bearing. It adopts the structure of drawing high-pressure water from the pressure water chamber of the pump cover to cool and lubricate; the non-driving end has no shaft seal, and adopts a static sealing method, and the driving end uses a mechanical seal to seal the shaft; the driving end and non-driving end water guide bearings are respectively controlled by An anti-rotation pin is fixed on the pump body to achieve radial positioning, the thrust bearing and pump shaft are radially positioned by a flat key, and the impeller is radially fixed on the pump shaft by a flat key to realize force and moment transmission.

In a specific implementation example of the present invention, a horizontal double-suction centrifugal pump supported by a water guiding bearing includes: a non-driving end cover, a round nut, a non-driving end flushing pipeline, a thrust bearing, an O-ring, a water guiding bearing, 1st sealing ring, impeller nut, 1st key, impeller, 2nd sealing ring, pump cover, drive end flushing line, mechanical seal, drive end cover, pump shaft, 1st fastener, pump body, 2nd Key, second fastener, anti-rotation pin; the transmission between the pump shaft and the impeller is through the first key; the impeller is axially positioned through the shaft shoulder at the driving end and the impeller nut at the non-driving end; the pump body, the pump cover and the impeller The first sealing ring is installed at the non-driving end, and the second sealing ring is installed at the driving end. The function of the two sealing rings is to reduce the leakage of high-pressure water in the pump cover of the pump body to the impeller inlet; The side throat is equipped with a water guide bearing, and the inside of the water guide bearing is attached with polymer materials. The water guide bearing is axially fixed through the pump body, the inner cavity of the pump cover and the end cover of the non-drive end. The anti-rotation pin is located radially.

In a specific implementation example of the present invention, at the non-driving end, a thrust bearing is installed on the outside of the water guide bearing, the thrust bearing is positioned axially through the shaft shoulder and the round nut, and is fixed on the pump shaft by the second key to rotate with the shaft. The thrust bearing and the water guide bearing, the shaft shoulder and the round nut are attached to the polymer material on both sides; the non-driving end cover and the pump body and the pump cover are equipped with O-rings at the matching seam, and the non-driving end cover and the A non-driving flushing pipeline is installed between the pressure water chambers of the pump cover, and the non-driving end cover is fixed on the pump body pump cover through the second fastener; at the driving end, a mechanical seal is installed on the outside of the water guide bearing, and the driving end end cover is fixed on the pump body pump cover; A driving end flushing pipeline is installed between the cover and the pressure water chamber of the pump cover, and the driving end cover is fixed on the pump body pump cover through the first fastener.

In a specific implementation example of the present invention, the non-driving end flushing pipeline and the driving end flushing pipeline are sequentially equipped with a throttling orifice plate, a filter, a ball valve, and a flow meter from the pump cover to the flushing chamber.

In a specific implementation example of the present invention, the polymer material is UPE ultra-high molecular weight polyethylene.

In a specific implementation example of the present invention, the surface of the thrust bearing at the non-driving end is attached with polymer materials, the contact surfaces of the thrust bearing and the water guide bearing are respectively polymer materials and metal materials, and the thrust bearing bears the axial force generated by the centrifugal pump .

In a specific implementation example of the present invention, the outer diameter of the sealing ring at the driving end of the impeller is about 1-2 mm larger than the outer diameter of the sealing ring at the non-driving end.

The positive and progressive effect of the present invention is that: the horizontal double-suction centrifugal pump supported by the water guide bearing provided by the present invention has the following advantages:

1. The water guide bearing structure with polymer material is adopted, and the cooling and lubrication are carried out by diverting water from the pump chamber. Compared with the traditional double-suction pump lubricated by thin oil or grease, the bearing structure and cooling and lubrication method are simplified. It also reduces installation and maintenance costs.

2. The present invention installs the bearing components at the throat of the pump body and pump cover, which greatly shortens the bearing span and improves the operation stability and reliability of the single-stage double-suction horizontal split centrifugal pump.

3. Compared with the traditional single-stage double-suction horizontal split centrifugal pump, the present invention installs the bearing components at the throat of the pump body pump cover, so there is no need to install a shaft seal (filling or mechanical seal) structure at the non-driving end, only The sealing requirements can be met by using the O-ring static seal, which further simplifies the structure, reduces the number of wearing parts, shortens the total length of the pump shaft, and improves the strength of the pump shaft.

4. The polymer material on the surface of the thrust bearing is positioned on the metal surface through positioning grooves and high-strength structural glue, which is firmly connected and easy to process and manufacture.

5. The radial end surface and the inner surface of the water guide bearing are provided with a water tank, and a drainage pipeline is provided between the pressurized water chamber and the sealing gland of the non-driving end to introduce the medium into the bearing cavity to realize the cooling and lubrication of the thrust bearing and the water guide bearing. .

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a partial schematic diagram of the structure of the non-driving end bearing in the present invention.

Fig. 3 is a partial schematic diagram of the driving end bearing and mechanical seal structure in the present invention.

Fig. 4-1 is a front view of a schematic diagram of a water guide bearing in the present invention.

Figure 4-2 is the left view of Figure 4-1.

Below is the name corresponding to the label in the present invention:

In the figure: non-drive end cover 1, round nut 2, non-drive end flushing pipe 3, thrust bearing 4, O-ring 5, water guide bearing 6, first seal ring 7, impeller nut 8, first key 9 , impeller 10, second sealing ring 11, pump cover 12, driving end flushing pipeline 13, mechanical seal 14, driving end cover 15, pump shaft 16, first fastener 17, pump body 18, second key 19 , the second fastener 20, the anti-rotation pin 21, the water tank 22, the polymer material 23, the throttling orifice plate 24, the filter 25, the ball valve 26, and the flow meter 27.

Detailed ways

The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.

Fig. 1 is a schematic diagram of the overall structure of the present invention, as shown in Fig. 1: a horizontal double-suction centrifugal pump supported by water guide bearings provided by the present invention includes: a pump body, a pump cover, a driving end, and a non-driving end. The pump body and pump cover throat of the centrifugal pump is provided with a bearing cavity to install the bearings. The non-driving end uses a combination of water guide bearing and thrust bearing, and the driving end uses a water guide bearing. The surface of the water guide bearing and thrust bearing is attached with polymer materials. , both the driving end and the non-driving end adopt a structure in which high-pressure water is drawn from the pressure water chamber of the pump cover for cooling and lubrication; the non-driving end has no shaft seal and adopts a static sealing method, that is, the mating surface of the pump body pump cover and the non-driving end cover O-ring seal is used, and the drive end uses a mechanical seal to seal the shaft; the water guide bearing at the drive end and the non-drive end are respectively fixed on the pump body by an anti-rotation pin to achieve radial positioning, and the thrust bearing and the pump shaft are realized by a flat key Radial positioning, the impeller is radially fixed on the pump shaft by a flat key to realize the transmission of force and torque.

The compact single-stage double-suction horizontal split centrifugal pump provided by the present invention includes: non-drive end cover 1, round nut 2, non-drive end flushing pipeline 3, thrust bearing 4, O-ring 5, water guide bearing 6 , the first sealing ring 7, the impeller nut 8, the first key 9, the impeller 10, the second sealing ring 11, the pump cover 12, the driving end flushing pipeline 13, the mechanical seal 14, the driving end cover 15, the pump shaft 16, The first fastener 17 , the pump body 18 , the second key 19 , the second fastener 20 , and the anti-rotation pin 21 .

The transmission between the pump shaft 16 and the impeller 10 is carried out through the first key 9; the impeller 10 is axially positioned by the shaft shoulder at the driving end and the impeller nut 8 at the non-driving end; The first sealing ring 7 is installed at the drive end, and the second sealing ring 11 is installed at the driving end. The function of the two sealing rings is to reduce the leakage of high-pressure water in the pump body and pump cover to the impeller inlet; the pump body 18 and the pump cover 12 are two The position of the side throat is equipped with a water guide bearing 6, and a polymer material 23 is attached to the inner side of the water guide bearing. The anti-rotation pin 21 installed on the pump body 18 is radially positioned; at the non-driving end, a thrust bearing 4 is installed on the outside of the water guide bearing 6, and the thrust bearing 4 is positioned axially through the shaft shoulder and the round nut 2, and through the second key 19 is fixed on the pump shaft and rotates with the shaft, and the thrust bearing 4 is attached with polymer materials on both sides of the contact with the water guide bearing, the shaft shoulder and the round nut; the non-drive end cover 1 cooperates with the pump body 18 and the pump cover 12 An O-ring 5 is installed at the seam, and a non-drive flushing pipeline 3 is installed between the non-drive end cover 1 and the pressure water chamber of the pump cover 12, and the non-drive end cover 1 is fixed on the pump by the second fastener 20. On the pump cover of the body; at the driving end, a mechanical seal 14 is installed outside the water guide bearing 6, and a driving end flushing pipeline 13 is installed between the driving end cover 15 and the pump cover 12 pressure water chamber, and the driving end cover 15 passes through the first A fastener 17 is fixed on the pump cover of the pump body; the non-driving end flushing pipeline 3 and the driving end flushing pipeline 13 are sequentially equipped with a throttle orifice 24, a filter 25, a ball valve 26, and a flow rate from the pump cover to the flushing chamber. Count 27.

In the specific implementation process of the present invention, the radial end surface and the inner surface of the water guide bearing are provided with water grooves 22, and a drainage pipeline is provided between the pressurized water chamber and the sealing gland of the non-driving end to introduce the medium into the bearing cavity to realize the thrust bearing. Cooling and lubricating with water guide bearing.

The inner surface of the water guide bearing is attached with polymer materials, and the water guide bearing can realize self-lubrication and good wear resistance. In the specific implementation process of the present invention, the polymer material is UPE ultra-high molecular polyethylene, and the material has the following characteristics: ①The wear resistance ranks the crown of plastics, which is 7 times that of ordinary carbon steel; ②The impact strength ranks among the plastics First, it is 5 times that of ABS; ③ self-lubricating performance is equivalent to polytetrafluoroethylene, the price is only 1/7; ④ strong corrosion resistance, high chemical and technical performance; ⑤ good non-stick, the surface of the product is not easy to adhere to other materials ; ⑥ strong impact energy absorption; ⑦ hygienic, non-toxic, low temperature resistant, malleable under liquid nitrogen.

The surface of the thrust bearing at the non-drive end is attached with polymer materials, the contact surfaces of the thrust bearing and the water guide bearing are respectively polymer materials and metal materials, and the thrust bearing bears the axial force generated by the centrifugal pump.

The polymer material on the surface of the thrust bearing is positioned on the metal surface through positioning grooves and high-strength structural glue, which is firmly connected and easy to process and manufacture.

A drainage pipeline is arranged between the pressurized water chamber of the double-suction pump and the sealing gland of the driving end in the present invention, and the medium is introduced into the mechanical seal to realize flushing of the mechanical seal, cooling and lubrication of the water guiding bearing.

A throttling orifice, a filter, a ball valve, and a flow meter are installed in the drainage pipeline to purify the medium in the pipeline and control the flow and pressure of the medium.

The outer diameter of the sealing ring at the driving end of the impeller is about 1 to 2mm larger than the outer diameter of the sealing ring at the non-driving end. When the pump is running, the pressure area at both ends of the impeller is different to generate a directional axial force from the non-driving end to the driving end, so that the shaft is always It is in a state of tension and is not easy to bend and deform, which is conducive to the stable operation of the pump.

The invention cancels the structure of the bearing body, and the bearing cavity is directly processed on the housing, which can effectively shorten the span of the bearing and greatly reduce the risk of shaft breakage.

The non-driving end of the present invention adopts a static seal sealing method, cancels the shaft seal parts in the traditional structure, and has less wearing parts.

The shaft seal at the driving end of the present invention uses a mechanical seal, and the pump body is provided with a liquid collection chamber at the lower part of the mechanical seal, and a threaded hole is left at the bottom of the collection chamber to collect the leaked medium and discharge it to a designated place.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Various changes and improvements fall within the scope of the claimed invention, which is defined by the appended claims and their equivalents.

Claims (7)

1. The utility model provides an adopt horizontal double suction centrifugal pump that water guide bearing supported which characterized in that: the horizontal double suction centrifugal pump supported by the water guide bearing comprises: a pump body, a pump cover, a driving end and a non-driving end,

the pump body of the centrifugal pump and the throat position of the pump cover are provided with bearing cavities for mounting water guide bearings, the non-driving end uses the combination of the water guide bearings and a thrust bearing, the driving end uses the water guide bearings, and the driving end and the non-driving end both adopt a structure for guiding high-pressure water from a pump cover water pressing chamber for cooling and lubricating; the non-driving end is free of shaft seal, a static sealing mode is adopted, and the driving end seals the shaft by using mechanical seal; the drive end and the non-drive end of the water guide bearing are respectively fixed on the pump body by an anti-rotation pin to realize radial positioning, the thrust bearing and the pump shaft are radially positioned by a flat key, and the impeller is radially fixed on the pump shaft by the flat key to realize the transmission of force and moment.

2. The horizontal double suction centrifugal pump supported by the water guide bearing according to claim 1, wherein: the horizontal double suction centrifugal pump supported by the water guide bearing comprises: the device comprises a non-drive end cover, a round nut, a non-drive end flushing pipeline, a thrust bearing, an O-shaped ring, a water guide bearing, a first sealing ring, an impeller nut, a first key, an impeller, a second sealing ring, a pump cover, a drive end flushing pipeline, a mechanical seal, a drive end cover, a pump shaft, a first fastener, a pump body, a second key, a second fastener and an anti-rotation pin; the pump shaft and the impeller are driven through a first key; the impeller is axially positioned through a shaft shoulder at the driving end and an impeller nut at the non-driving end; a first sealing ring is arranged between the pump body and the pump cover and between the impeller and the pump cover at the non-driving end, a second sealing ring is arranged at the driving end, and the two sealing rings are used for reducing the leakage of high-pressure water in the pump body and the pump cover to the inlet of the impeller; water guide bearings are arranged at the throat positions on the two sides of the pump body and the pump cover, a high polymer material is attached to the inner sides of the water guide bearings, the water guide bearings are axially fixed through the pump body, the spigot of the inner cavity of the pump cover and the end cover of the non-driving end, and are radially positioned through rotation prevention pins arranged on the pump body.

3. The horizontal double-suction centrifugal pump supported by the water guide bearing according to claim 2, characterized in that: at the non-driving end, a thrust bearing is mounted on the outer side of the water guide bearing, the thrust bearing is axially positioned through a shaft shoulder and a round nut and is fixed on a pump shaft through a second key to rotate along with the shaft, and polymer materials are attached to two sides of the thrust bearing, which are in contact with the water guide bearing, the shaft shoulder and the round nut; an O-shaped ring is arranged at the matched seam allowance of the non-driving end cover, the pump body and the pump cover, a non-driving flushing pipeline is arranged between the non-driving end cover and the pump cover pumping chamber, and the non-driving end cover is fixed on the pump cover of the pump body through a second fastening piece; at the driving end, a mechanical seal is installed on the outer side of the water guide bearing, a driving end flushing pipeline is installed between the driving end cover and the pump cover pumping water chamber, and the driving end cover is fixed on the pump cover of the pump body through a first fastening piece.

4. The horizontal double suction centrifugal pump supported by the water guide bearing according to claim 2, wherein: and the non-driving end flushing pipeline and the driving end flushing pipeline are sequentially provided with a throttling orifice plate, a filter, a ball valve and a flowmeter from the pump cover to the flushing cavity.

5. The horizontal double suction centrifugal pump supported by the water guide bearing according to claim 2, wherein: the high polymer material is UPE ultrahigh molecular polyethylene.

6. The horizontal double suction centrifugal pump supported by the water guide bearing according to claim 2, wherein: the surface of the thrust bearing at the non-driving end is attached with a high polymer material, the contact surfaces of the thrust bearing and the water guide bearing are respectively made of the high polymer material and a metal material, and the thrust bearing bears the axial force generated by the centrifugal pump.

7. The horizontal double suction centrifugal pump supported by the water guide bearing according to claim 2, wherein: the outer diameter of the impeller driving end sealing ring is about 1-2 mm larger than that of the non-driving end sealing ring.

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