CN213953968U

CN213953968U - Novel horizontal water pump shaft sleeve structure

Info

Publication number: CN213953968U
Application number: CN202022940611.8U
Authority: CN
Inventors: 吴卫贤; 段丽萍; 何道刚
Original assignee: Sdic Panjiang Power Generation Co ltd
Current assignee: Sdic Panjiang Power Generation Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-08-13
Anticipated expiration: 2030-12-10

Abstract

The utility model discloses a novel horizontal water pump axle sleeve structure, include: a water pump housing; a pump shaft penetrating through both side walls of the water pump housing; the bearing block is sleeved at two ends of the pump shaft and is positioned outside the water pump shell; the impeller is fixedly arranged on the pump shaft and is positioned in the water pump shell; the shaft sleeve is fixedly arranged on the pump shaft and is positioned in the water pump shell; the water pump packing is sleeved on the shaft sleeve and positioned in the water pump shell, and a Ni-WC wear-resistant layer is fused on the shaft sleeve corresponding to the water pump packing; the sealing device is arranged between the pump shaft and the shaft sleeve and is positioned on the side far away from the impeller; under the working state, the pump shaft can transmit the rotating torque to the impeller and drive the impeller to rotate. The utility model discloses can solve current horizontal water pump and leak easily and lead to operation, technical problem that the maintenance cost is high in the operation process.

Description

Novel horizontal water pump shaft sleeve structure

Technical Field

The utility model relates to a novel horizontal water pump axle sleeve structure belongs to power plant circulating water pump technical field.

Background

The circulating water system is an important auxiliary system of a thermal power plant and plays a significant role in safe and economic operation of the power plant. The circulating water system is used for cooling the exhaust steam of the steam turbine to condense the exhaust steam into water and maintain the high vacuum of the steam turbine, so that the operation quality of the circulating water system directly affects the vacuum degree of the steam turbine and even causes the end difference and the supercooling degree of the steam turbine to change, additional vibration of the steam turbine and blade breakage accidents on an impeller are caused, and the position of the circulating water system is very important in a power plant.

The horizontal water pump is a common circulating water pump, and the shaft end seal of the horizontal water pump is a packing seal. In the operation process, the applicant finds that the gap between the shaft sleeve and the shaft of the water pump is large due to the design of the shaft sleeve and the reason of water quality, the packing selection type cannot be adjusted due to hardening of the circulating water quality in the operation, and the water leakage amount of the packing at the driving end and the non-driving end is large, so that the water enters a bearing chamber; meanwhile, the corrosion of the water leakage part is aggravated due to the medicine adding in the circulating water operation, the equipment is frequently overhauled, the abrasion of a bearing bush and a shaft neck cannot be relieved due to the frequent oil change in the unit operation, the circulating water pump operates with diseases, and great potential safety hazards are brought to the steam turbine unit. In addition, the circulating water pump packing greatly leaks water to cause water resource waste, the frequent power consumption of the starting of the sewage pump is increased, the oil of the bearing chamber is frequently replaced, and the running and maintenance cost is increased.

SUMMERY OF THE UTILITY MODEL

Based on the above, the utility model provides a novel horizontal water pump axle sleeve structure to solve current horizontal water pump and leak easily at the operation in-process and lead to operation, technical problem that the maintenance cost is high.

The technical scheme of the utility model is that: a novel horizontal water pump shaft bushing structure, wherein, the structure includes:

a water pump housing;

a pump shaft penetrating through both side walls of the water pump housing;

the bearing block is sleeved at two ends of the pump shaft and is positioned outside the water pump shell;

the impeller is fixedly arranged on the pump shaft and is positioned in the water pump shell;

the shaft sleeve is fixedly arranged on the pump shaft and is positioned in the water pump shell;

the water pump packing is sleeved on the shaft sleeve and positioned in the water pump shell, and a Ni-WC wear-resistant layer is fused on the shaft sleeve corresponding to the water pump packing;

the sealing device is arranged between the pump shaft and the shaft sleeve and is positioned on the side far away from the impeller;

under the working state, the pump shaft can transmit the rotating torque to the impeller and drive the impeller to rotate.

In one example, a flange is provided on the shaft sleeve near the impeller side, a bolt hole is provided on the flange, a fixing hole is correspondingly provided on the end surface of the impeller, and bolts are inserted into the bolt hole and the fixing hole to fix the shaft sleeve on the end surface of the impeller.

In one example, the sealing device comprises:

the inner ring groove is formed on the inner wall of the shaft sleeve;

the sealing ring is arranged in the inner ring groove;

the inner ring surface and the outer ring surface of the sealing ring are respectively in extrusion contact with the pump shaft and the shaft sleeve.

In one example, the seal ring is an O-ring seal.

In one example, the structure further comprises:

and the water retaining ring is sleeved on the pump shaft between the bearing block and the water pump packing.

In one example, the water retaining ring is made of polytetrafluoroethylene.

In one example, a Ni-WC wear-resistant layer is welded on the shaft sleeve corresponding to the water pump packing.

In one example, the fit clearance between the two ends and the middle part of the shaft sleeve and the pump shaft is 0.02mm, and the fit width at the three points is not less than 30 mm.

In one example, the material of the shaft sleeve is #45 steel.

In one example, the machined surface roughness of the sleeve is 0.8.

The utility model has the advantages that: the utility model discloses a cladding has Ni-WC wearing layer at the mounted position that the axle sleeve corresponds the water pump packing, can strengthen the wearability of axle sleeve, improves the installation leakproofness of axle sleeve and water pump packing. The sealing device is arranged on the pump shaft and the shaft sleeve, so that water in the water pump shell can be prevented from leaking outwards between the shaft sleeve and the pump shaft, and the sealing performance of the circulating water pump can be further improved. Through the cooperation of aforementioned means, the utility model discloses can solve horizontal water pump and leak easily and lead to operation, technical problem that the maintenance cost is high at the operation in-process.

Drawings

FIG. 1 is a schematic structural diagram of a novel horizontal water pump shaft sleeve structure;

description of reference numerals:

the pump comprises a water pump shell 1, a pump shaft 2, a bearing seat 3, an impeller 4, a shaft sleeve 5, a 51 Ni-WC wear-resistant layer, a flange 52, a bolt 53, a water pump packing 6, a sealing ring 7 and a water retaining ring 8.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a novel horizontal water pump shaft sleeve structure according to an embodiment of the present invention includes a water pump housing 1, a pump shaft 2, a bearing seat 3, an impeller 4, a shaft sleeve 5, a water pump packing 6, and a sealing device.

The water pump shell 1 is mainly used for mounting components such as a pump shaft 2, an impeller 4, a shaft sleeve 5, a water pump packing 6 and the like. The pump shaft 2 penetrates through two side walls of the water pump housing 1, namely two ends of the water pump shaft 2 extend out of the water pump housing 1. The bearing block 3 is sleeved at two ends of the pump shaft 2 and is positioned outside the water pump shell 1, and the bearing block 3 is used for supporting the pump shaft 2. The impeller 4 is fixedly arranged on the pump shaft 2 and is positioned in the water pump shell 1. The shaft sleeve 5 is fixedly arranged on the pump shaft 2 and is positioned in the water pump shell 1. The water pump packing 6 is sleeved on the shaft sleeve 5 and is positioned in the water pump shell 1, and a Ni-WC wear-resistant layer 51 is coated on the shaft sleeve 5 corresponding to the water pump packing 6 in a melting mode. The sealing device is arranged between the pump shaft 2 and the shaft sleeve 5 and is positioned at the side far away from the impeller 4. Under the working state, the pump shaft 2 can transmit the rotation torque to the impeller 4 and drive the impeller 4 to rotate.

It should be noted that, as will be known to those skilled in the art, the water pump housing 1 of the horizontal water pump includes a water inlet and a water outlet, and the horizontal water pump rotates the impeller 4 mounted on the pump shaft 2 by the rotation of the pump shaft 2 in the water pump housing 1, so as to deliver water from the water inlet to the water outlet of the horizontal water pump.

The utility model discloses a cladding has Ni-WC wearing layer 51 at the mounted position that axle sleeve 5 corresponds water pump packing 6, can strengthen axle sleeve 5's wearability, improves axle sleeve 5 and water pump packing 6's installation leakproofness. The sealing device is arranged on the pump shaft 2 and the shaft sleeve 5, so that water in the water pump shell 1 can be prevented from leaking outwards from a position between the shaft sleeve 5 and the pump shaft 2, and the sealing performance of the circulating water pump can be further improved. Through the aforesaid means, the utility model discloses can solve circulating water pump and leak easily at the operation in-process and lead to operation, the technical problem that the maintenance cost is high.

Further, a flange 52 is arranged on the shaft sleeve 5 close to the impeller 4, a bolt hole is arranged on the flange 52, a fixing hole is correspondingly arranged on the end face of the impeller 4, and a bolt 53 penetrates into the bolt hole and the fixing hole to fix the shaft sleeve 5 on the end face of the impeller 4. In this embodiment, the number of bolt holes may be 8, and the bolt holes are formed in the flange 52 at circumferential intervals.

Particularly, axle sleeve 5 passes through flange 52 fixed mounting on impeller 4, so axle sleeve 5 can rotate with impeller 4 jointly, avoids the two relative rotation to lead to axle sleeve 5 and impeller 4 terminal surface because of the not tight problem of leaking that causes of cooperation seal, improvement that can be further sealed effect.

Further, the sealing means comprises an inner annular groove formed in the sleeve 5 and a sealing ring 7 mounted in the inner annular groove. And the inner and outer ring surfaces of the sealing ring 7 are respectively in pressing contact with the pump shaft 2 and the shaft sleeve 5 so as to realize effective sealing of the two. In this embodiment, the seal ring 7 may be an O-ring. In this embodiment, a plurality of sealing devices, i.e. a plurality of inner ring grooves and sealing rings 7, for example two sealing devices may be arranged side by side in the shaft sleeve 5 to improve the sealing effect.

Further, this structure still includes manger plate circle 8, and manger plate circle 8 cover is located on the pump shaft 2 between bearing frame 3 and the water pump packing 6. In this embodiment, the water retaining ring 8 may be made of teflon.

Particularly, the utility model discloses a set up manger plate circle 8 on pump shaft 2 between bearing frame 3 and water pump packing 6 for water that water pump packing 6 outwards sprayed or along the water that pump shaft 2 flows directly block by manger plate circle 8, and along manger plate circle 8 with the action of gravity of self downflow, therefore can avoid water to enter into in the bearing frame 3, thereby prolonged the life of bearing frame 3 greatly, improved horizontal water pump's reliability.

Furthermore, the fit clearance between the two ends and the middle part of the shaft sleeve 5 and the pump shaft 2 is 0.02mm, and the fit width of the three points is not less than 30 mm. The roughness of the processing surface of the shaft sleeve 5 is 0.8, the material of the shaft sleeve 5 is #45 steel, and the shaft sleeve 5 is fixed on the pump shaft 2 through a key. Through the test of the applicant, the structure has good matching performance and can prolong the service life.

After the improvement, the shaft sleeve 5 packing of the circulating water pump has no abnormal water leakage phenomenon during operation or standby, the bearing chamber is clear and transparent in oil quality, the overhaul period is prolonged, the maintenance cost of daily equipment is saved, and the safe and stable operation of the unit is ensured. Reduce to change lubricating oil about 800L each year, reduce circulating water moisturizing volume about 3600 m/year, pump room sump dredge pump operation electric quantity saving 3200 KW.h/year along, reduce daily maintenance and maintenance in-process manpower, material resources, improve the fail safe nature of circulating water system operation through circulating water pump shaft 2 sets of structural style optimization transformation, reach festival level reduction's purpose.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a novel horizontal water pump axle sleeve structure which characterized in that, the structure includes:

a water pump housing (1);

the pump shaft (2) penetrates through two side walls of the water pump shell (1);

the bearing block (3) is sleeved at two ends of the pump shaft (2) and is positioned outside the water pump shell (1);

the impeller (4) is fixedly arranged on the pump shaft (2) and is positioned in the water pump shell (1);

the shaft sleeve (5) is fixedly arranged on the pump shaft (2) and is positioned in the water pump shell (1);

the water pump packing (6) is sleeved on the shaft sleeve (5) and positioned in the water pump shell (1), and a Ni-WC wear-resistant layer (51) is cladded on the shaft sleeve (5) corresponding to the water pump packing (6);

the sealing device is arranged between the pump shaft (2) and the shaft sleeve (5) and is positioned on the side far away from the impeller (4);

under the working state, the pump shaft (2) can transmit the rotating torque to the impeller (4) and drive the impeller (4) to rotate.

2. The novel horizontal water pump shaft sleeve structure according to claim 1, wherein a flange (52) is arranged on the shaft sleeve (5) close to the impeller (4), a bolt hole is formed in the flange (52), a fixing hole is correspondingly formed in the end face of the impeller (4), and a bolt (53) penetrates into the bolt hole and the fixing hole to fix the shaft sleeve (5) on the end face of the impeller (4).

3. The novel horizontal water pump shaft sleeve structure according to claim 1, wherein the sealing device comprises:

the inner ring groove is formed on the inner wall of the shaft sleeve (5);

a seal ring (7) mounted in the inner annular groove;

the inner ring surface and the outer ring surface of the sealing ring (7) are respectively in extrusion contact with the pump shaft (2) and the shaft sleeve (5).

4. The novel horizontal water pump shaft sleeve structure according to claim 3, wherein the sealing ring (7) is an O-shaped sealing ring.

5. The novel horizontal water pump shaft sleeve structure of claim 1, wherein the structure further comprises:

and the water retaining ring (8) is sleeved on the pump shaft (2) between the bearing seat (3) and the water pump packing (6).

6. The novel horizontal water pump shaft sleeve structure according to claim 5, wherein the water retaining ring (8) is made of polytetrafluoroethylene.

7. The novel horizontal water pump shaft sleeve structure according to claim 1, wherein fit clearances between two ends and a middle part of the shaft sleeve (5) and the pump shaft (2) are 0.02mm, and fit widths at three points are not less than 30 mm.

8. The novel horizontal water pump shaft sleeve structure according to claim 1, wherein the material of the shaft sleeve (5) is #45 steel.

9. The novel horizontal water pump shaft sleeve structure according to claim 1, wherein the machined surface roughness of the shaft sleeve (5) is 0.8.