CN113357168A - Centrifugal compressor rotor with hydraulically-detachable impeller and impeller mounting and dismounting method - Google Patents
Centrifugal compressor rotor with hydraulically-detachable impeller and impeller mounting and dismounting method Download PDFInfo
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- CN113357168A CN113357168A CN202110795603.5A CN202110795603A CN113357168A CN 113357168 A CN113357168 A CN 113357168A CN 202110795603 A CN202110795603 A CN 202110795603A CN 113357168 A CN113357168 A CN 113357168A
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- Prior art keywords
- impeller
- main shaft
- locking nut
- centrifugal compressor
- shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/053—Shafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/06—Lubrication
- F04D29/063—Lubrication specially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a centrifugal compressor rotor with a hydraulically-assembled and disassembled impeller and an impeller assembling and disassembling method, wherein the centrifugal compressor rotor comprises a main shaft, a balance disc, the impeller, a shaft sleeve and a locking nut, the balance disc, the impeller, the shaft sleeve and the locking nut are sequentially arranged on the main shaft, and the locking nut is connected with the main shaft through threads; the impeller is sleeved on the main shaft; an annular oil through groove is formed in a matched conical surface of the main shaft, an axial oil filling hole is formed in the axis of the main shaft, one end of the axial oil filling hole is located at the shaft head of the main shaft, and the other end of the axial oil filling hole is communicated with the annular oil through groove through a radial oil inlet hole. The impeller is not required to be heated by flame in the assembling and disassembling processes of the impeller, the operation is simple and safe, and the deformation and the bluing of the impeller due to heating in the hot charging process are avoided; the impeller is axially positioned and locked through the locking nut, the shaft sleeve and the shaft shoulder structure on the main shaft, so that the axial movement of the impeller in the rotation of the rotor is avoided; realize the accurate location of impeller installation through hydraulic tool, avoided the dismouting to cause the damage to impeller and main shaft fitting surface, dismouting many times.
Description
Technical Field
The invention belongs to the technical field of centrifugal compressors, and particularly relates to a centrifugal compressor rotor with a hydraulically-detachable impeller and an impeller mounting and dismounting method.
Background
The centrifugal compressor is the core equipment in key devices in various industrial fields such as petrochemical industry, coal chemical industry, natural gas transportation, metallurgy, chemical fertilizers, pharmacy, and the like, and the operation condition of the centrifugal compressor directly influences the production benefit of the whole process device. Therefore, the centrifugal compressor not only needs to meet the requirements of high efficiency, safety and stability, long cycle and the like, but also needs to have the characteristics of convenient maintenance, low maintenance cost and the like.
The centrifugal compressor rotor is as the main rotatory work component that does of unipolar centrifugal compressor, and it includes main shaft, impeller and other fasteners, and the current assembly methods of impeller and main shaft mainly have two kinds: one is an interference fit and the other is an interference + pin fit. However, the two assembling modes need to heat the impeller through flame, the interference fit between the impeller and the main shaft is realized by utilizing the characteristic of expansion with heat and contraction with cold of the inner hole of the impeller, and the operation process is complex and dangerous. Particularly, in the process of detaching the impeller from the rotor spindle, the centrifugal compressor has a compact rotor structure and is difficult to heat the impeller, so that on one hand, the impeller is easily heated unevenly, and the matching of an inner hole of the impeller and the spindle is damaged during detachment; on the other hand, if the impeller can not be disassembled after being heated, the impeller can be disassembled in a mode of hammering the impeller while heating, the hardness of the heated impeller is reduced, the knocking acting force can damage the surface of the impeller, the appearance quality of the impeller is influenced if the impeller is light, the balance of a rotor is influenced if the impeller is heavy, and even the impeller is scrapped. Meanwhile, when the interference magnitude is large, the impeller is blue due to overhigh local heating temperature, and the appearance of the impeller is affected.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, an object of the present invention is to provide a centrifugal compressor rotor with hydraulically detachable impellers, so as to solve the problems of the prior centrifugal compressor rotor that the impeller is difficult to detach, easy to deform, poor in repeated assembly precision, poor in appearance of the rotor due to heating, and safe risk in the detaching process.
In order to achieve the aim, the invention provides a centrifugal compressor rotor with a hydraulically-detachable impeller, which comprises a main shaft, a balance disc, the impeller, a shaft sleeve and a locking nut, wherein the balance disc, the impeller, the shaft sleeve and the locking nut are sequentially arranged on the main shaft, and the locking nut is connected with the main shaft through threads; the inner hole of the impeller is a conical surface, the impeller is sleeved on the main shaft, and the conical surface of the inner hole of the impeller is in interference fit with the matching conical surface of the outer wall of the main shaft; the oil filling device is characterized in that an annular oil through groove is formed in a matched conical surface of the main shaft, an axial oil filling hole is formed in the axis of the main shaft, one end of the axial oil filling hole is located at the shaft head position of the main shaft and is provided with a threaded hole, and the other end of the axial oil filling hole is communicated with the annular oil through groove through a radial oil inlet hole.
Further, the taper of the inner hole conical surface of the impeller is 1: 20.
furthermore, the shaft sleeve is in micro interference fit with the matching conical surface of the main shaft.
Further, the thread turning direction of the locking nut is opposite to the turning direction of the rotor.
Furthermore, two arc-shaped holes are symmetrically formed in the front end of the locking nut from top to bottom, and two threaded holes are formed in the front end of the locking nut perpendicular to the plane where the two arc-shaped holes are formed and used for installing locking screws.
Furthermore, a plurality of radial unthreaded holes are uniformly formed in the side wall of the locking nut, and the radial unthreaded holes are blind holes.
Furthermore, the number of the radial unthreaded holes in the side wall of the locking nut is 4.
Furthermore, the locking screw is an inner hexagon screw or an outer hexagon screw.
The invention also provides an impeller installation method of the centrifugal compressor rotor with the hydraulically-detachable impeller, which comprises the following steps:
1) sequentially installing an impeller and a shaft sleeve on the part of the main shaft matching conical surface, and coating a lubricant on the contact surface of the shaft sleeve and the main shaft;
2) smearing a lubricant on the contact surface of the locking nut and the shaft sleeve, sleeving the locking nut on the main shaft, and rotating the locking nut until the locking nut is tightly attached to the end surface of the shaft sleeve;
3) a high-pressure oil connector is connected into a threaded hole of a spindle head, then high-pressure oil of a hydraulic device is injected into an axis oil injection hole of a spindle by the high-pressure oil connector, and then flows into an annular oil through groove from a radial oil inlet hole;
4) a plurality of extension rods are respectively inserted into radial unthreaded holes of the locking nuts, the locking nuts are slowly rotated and are matched with high-pressure oil from a high-pressure hydraulic device until the side end face of an inner hole wheel disc of the impeller is attached to a shaft shoulder of a main shaft, and the impeller is installed in place;
5) the locking screw is arranged in a corresponding threaded hole of the locking nut, the width of an arc-shaped hole at the front end of the locking nut is reduced by rotating the locking screw, and the purpose that the internal thread of the locking nut is matched with the main shaft for threaded locking is achieved;
6) thereby realizing the hydraulic installation of the impeller and the main shaft.
The invention also provides an impeller dismounting method of the centrifugal compressor rotor capable of hydraulically dismounting the impeller, which comprises the following steps:
1) the locking screw at the end part of the locking nut is removed, and then the locking nut is loosened, so that the axial distance between the locking nut and the end surface of the shaft sleeve 4 reaches a reasonable value;
2) high-pressure oil of a hydraulic device is injected into an axis oil injection hole of the main shaft by using a high-pressure oil joint, then flows into the annular oil through groove from the radial oil inlet hole, and is separated from the conical surface part of the main shaft by using the acting force of the high-pressure oil;
3) and (4) detaching the locking nut, and then detaching the shaft sleeve and the impeller in sequence to realize hydraulic detachment of the impeller.
Compared with the prior art, the invention has the following technical effects:
in the process of installing and disassembling the impeller, flame is not needed to heat the impeller, the operation steps are simple and safe, and the problems of deformation of the impeller, blueing of the impeller due to heating and the like in the hot charging process are avoided; the impeller is axially positioned and locked through the locking nut, the shaft sleeve and the shaft shoulder structure on the main shaft, so that the axial movement of the impeller possibly occurring in the rotating process of the rotor is avoided; the impeller is accurately positioned by the hydraulic mounting tool, damage to the matching surface of the impeller and the main shaft caused by dismounting is avoided, and the impeller can be dismounted for many times.
Drawings
FIG. 1 is a schematic structural view of a rotor of a centrifugal compressor with hydraulically removable impellers according to the invention;
FIG. 2 is a schematic view of a spindle oiling structure;
FIG. 3 is a sectional view of the spindle oiling structure and a hydraulic device connection diagram;
fig. 4 is a structural schematic view of the lock nut. Wherein (B) is a B-B view of (a).
The invention is further explained below with reference to the drawings and the detailed description.
Detailed Description
The invention is suitable for rotors with single-stage, two-stage back-to-back, two-stage in-line and other structures.
As shown in fig. 1 to 3, the centrifugal compressor rotor with hydraulically detachable impellers of the present invention includes a main shaft 1, a balance disk 2, an impeller 3, a sleeve 4 and a lock nut 5. The balance disc 2, the impeller 3, the shaft sleeve 4 and the locking nut 5 are sequentially arranged on the main shaft 1, and the locking nut 5 is connected with the main shaft 1 through threads; the inner hole of the impeller 3 is a conical surface, the impeller 3 is sleeved on the main shaft, the inner hole conical surface of the impeller 3 is in interference fit with the matching conical surface of the outer wall of the main shaft 1, and the interference degree is checked and determined according to the rotating speed and the impeller structure; an annular oil through groove 7 is arranged on the matching conical surface of the main shaft 1. An axial oil filling hole 10 is formed in the axis of the main shaft 1, one end of the axial oil filling hole 10 is located at the shaft head position of the main shaft and is provided with a threaded hole for being connected with a high-pressure oil connector 9, and the other end of the axial oil filling hole is communicated with the annular oil through groove 7 through a radial oil inlet hole 11.
Preferably, the taper of the conical surface is 1: 20.
as shown in fig. 4, the sleeve 4 has a slight interference fit with the mating tapered surface of the spindle 1 (slight interference fit is a conventional term in the art, meaning that the interference is smaller relative to the general interference requirement). The locking nut 5 is connected with the main shaft 1 through threads, preferably, the thread turning direction of the locking nut 5 is opposite to the rotor turning direction, and the locking of the locking nut 5 and the main shaft 1 is realized through the locking screw 6, namely, the locking nut 5 is more and more tightened in the running process of the compressor. Specifically, two arc-shaped holes 12 are symmetrically formed in the front end of the locking nut 5 from top to bottom, and two threaded holes are formed in the front end of the locking nut 5 perpendicular to the plane where the two arc-shaped holes 12 are located and used for installing the locking screws 6. After the to-be-locked nut 5 is installed in place, the front end of the to-be-locked nut 5 is plastically deformed by pressing the locking screw 6, the deformation is checked and determined according to the rotating speed and the structure of the to-be-locked nut, and then the to-be-locked nut 5 is tightly connected with the main shaft 1 through threads, so that the to-be-locked nut 5 is prevented from loosening and tripping.
Preferably, a plurality of (preferably 4) radial unthreaded holes 12 are uniformly formed in the side wall of the lock nut 5, are blind holes and are used for inserting an extension rod 13, and the extension rod 13 is used for playing a crow bar role to drive the lock nut 5 to rotate.
Preferably, the locking screw 6 is a conventional socket head cap screw or socket head cap screw, such as the bolt M8 × 25-8.8 of GB/T5783.
The invention relates to a method for mounting an impeller of a rotor, which comprises the following steps:
1) the impeller 3 and the shaft sleeve 4 are sequentially arranged on the matched conical surface part of the main shaft 1, and molybdenum disulfide is coated on the contact surface of the shaft sleeve 4 and the main shaft 1 to play a role in lubrication;
2) coating molybdenum disulfide on the contact surface of the locking nut 5 and the shaft sleeve 4, sleeving the locking nut 5 on the main shaft, and rotating the locking nut 5 until the locking nut is tightly attached to the end surface of the shaft sleeve 4;
3) a high-pressure oil joint 9 is connected into a threaded hole of a spindle head of a main spindle 1, then high-pressure oil of a hydraulic device 8 is injected into an axis oil injection hole 10 of the main spindle 1 through the high-pressure oil joint 9, and then flows into an annular oil through groove 7 through a radial oil inlet hole 11;
4) a plurality of extension rods 13 are respectively inserted into radial unthreaded holes 12 of the locking nuts 5, the locking nuts 5 are slowly rotated and are matched with high-pressure oil from a high-pressure hydraulic device 8 until the end face of the inner hole wheel disc side of the impeller 3 is attached to the shaft shoulder of the main shaft 1, and the impeller 3 is installed in place;
5) the locking screw 6 is arranged in a threaded hole corresponding to the locking nut 5, the width of an arc-shaped hole at the front end of the locking nut 5 is reduced by rotating the locking screw 6, so that plastic deformation is generated, and the locking and anti-loosening effect of the matching thread of the internal thread of the locking nut 5 and the main shaft 1 is achieved;
6) thereby achieving hydraulic mounting of the impeller 3 with the main shaft 1.
The impeller dismounting method provided by the invention is opposite to the impeller mounting process, and comprises the following steps:
1) the locking screw 6 at the end part of the locking nut 5 is removed, then the locking nut 5 is loosened, so that the axial distance between the locking nut 5 and the end surface of the shaft sleeve 4 reaches a reasonable value L, the reasonable value is estimated by an impeller interference magnitude A through the following formula, and L is A (25-35);
2) high-pressure oil of a hydraulic device 8 is injected into an axis oil injection hole 10 of the main shaft 1 by a high-pressure oil joint 9, then flows into an annular oil through groove 7 from a radial oil inlet hole 11, and the impeller 3 is separated from the conical surface part of the main shaft 1 by the acting force of the high-pressure oil;
3) and the locking nut 5 is disassembled, and then the shaft sleeve 4 and the impeller 3 are disassembled in sequence, so that the hydraulic disassembly of the impeller 3 is realized.
The invention is applied to a basic level testing device of a plurality of centrifugal compressors produced by the applicant, is convenient to assemble and disassemble, is economic, reliable and safe, and can be assembled and disassembled for a plurality of times.
Claims (10)
1. A centrifugal compressor rotor with a hydraulically-assembled and disassembled impeller is characterized by comprising a main shaft, a balance disc, an impeller, a shaft sleeve and a locking nut, wherein the balance disc, the impeller, the shaft sleeve and the locking nut are sequentially arranged on the main shaft, and the locking nut is connected with the main shaft through threads; the inner hole of the impeller is a conical surface, the impeller is sleeved on the main shaft, and the conical surface of the inner hole of the impeller is in interference fit with the matching conical surface of the outer wall of the main shaft; the oil filling device is characterized in that an annular oil through groove is formed in a matched conical surface of the main shaft, an axial oil filling hole is formed in the axis of the main shaft, one end of the axial oil filling hole is located at the shaft head position of the main shaft and is provided with a threaded hole, and the other end of the axial oil filling hole is communicated with the annular oil through groove through a radial oil inlet hole.
2. The rotor of a centrifugal compressor with hydraulically detachable impellers according to claim 1, wherein the conicity of the conical surface of the inner hole of the impeller is 1: 20.
3. the hydraulically removable centrifugal compressor rotor as defined in claim 1, wherein said bushing has a slight interference fit with the mating conical surface of the main shaft.
4. A hydraulically bladed centrifugal compressor rotor according to claim 1, characterized in that said lock nut is threaded in the opposite direction to the rotor.
5. The rotor of a centrifugal compressor with hydraulically detachable impellers as claimed in claim 1, wherein the front end of the lock nut is provided with two arc-shaped holes symmetrically up and down, and the front end of the lock nut perpendicular to the plane of the two arc-shaped holes is provided with two threaded holes respectively for installing the lock screw.
6. The rotor of a centrifugal compressor with hydraulically detachable impellers as claimed in claim 1, characterized in that a plurality of radial unthreaded holes are uniformly formed in the side wall of the lock nut, and the radial unthreaded holes are blind holes.
7. A hydraulically removable bladed centrifugal compressor rotor according to claim 1, characterized in that said locknut has 4 radial eyelets in the side wall.
8. A rotor for a centrifugal compressor having hydraulically detachable impellers according to claim 1, characterized in that said locking screws are socket head cap screws or socket head cap screws.
9. A method of mounting an impeller of a rotor of a centrifugal compressor having hydraulically detachable impellers according to claim 1, comprising the steps of:
1) sequentially installing an impeller and a shaft sleeve on the part of the main shaft matching conical surface, and coating a lubricant on the contact surface of the shaft sleeve and the main shaft;
2) smearing a lubricant on the contact surface of the locking nut and the shaft sleeve, sleeving the locking nut on the main shaft, and rotating the locking nut until the locking nut is tightly attached to the end surface of the shaft sleeve;
3) a high-pressure oil connector is connected into a threaded hole of a spindle head, then high-pressure oil of a hydraulic device is injected into an axis oil injection hole of a spindle by the high-pressure oil connector, and then flows into an annular oil through groove from a radial oil inlet hole;
4) a plurality of extension rods are respectively inserted into radial unthreaded holes of the locking nuts, the locking nuts are slowly rotated and are matched with high-pressure oil from a high-pressure hydraulic device until the side end face of an inner hole wheel disc of the impeller is attached to a shaft shoulder of a main shaft, and the impeller is installed in place;
5) the locking screw is arranged in a corresponding threaded hole of the locking nut, the width of an arc-shaped hole at the front end of the locking nut is reduced by rotating the locking screw, and the purpose that the internal thread of the locking nut is matched with the main shaft for threaded locking is achieved;
6) thereby realizing the hydraulic installation of the impeller and the main shaft.
10. A method of removing an impeller from a rotor of a centrifugal compressor having hydraulically detachable impellers according to claim 1, comprising the steps of:
1) the locking screw at the end part of the locking nut is removed, and then the locking nut is loosened, so that the axial distance between the locking nut and the end surface of the shaft sleeve reaches a reasonable value;
2) high-pressure oil of a hydraulic device is injected into an axis oil injection hole of the main shaft by using a high-pressure oil joint, then flows into the annular oil through groove from the radial oil inlet hole, and is separated from the conical surface part of the main shaft by using the acting force of the high-pressure oil;
3) and (4) detaching the locking nut, and then detaching the shaft sleeve and the impeller in sequence to realize hydraulic detachment of the impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110795603.5A CN113357168A (en) | 2021-07-14 | 2021-07-14 | Centrifugal compressor rotor with hydraulically-detachable impeller and impeller mounting and dismounting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110795603.5A CN113357168A (en) | 2021-07-14 | 2021-07-14 | Centrifugal compressor rotor with hydraulically-detachable impeller and impeller mounting and dismounting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113357168A true CN113357168A (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110795603.5A Pending CN113357168A (en) | 2021-07-14 | 2021-07-14 | Centrifugal compressor rotor with hydraulically-detachable impeller and impeller mounting and dismounting method |
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| CN (1) | CN113357168A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113770700A (en) * | 2021-09-13 | 2021-12-10 | 宝武集团马钢轨交材料科技有限公司 | Dismounting method for high-speed rail wheel mill hollow shaft assembly |
| CN114941661A (en) * | 2022-06-13 | 2022-08-26 | 贵州永红航空机械有限责任公司 | Combined shaft for dynamic balance test of oil mist separator impeller |
-
2021
- 2021-07-14 CN CN202110795603.5A patent/CN113357168A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113770700A (en) * | 2021-09-13 | 2021-12-10 | 宝武集团马钢轨交材料科技有限公司 | Dismounting method for high-speed rail wheel mill hollow shaft assembly |
| CN114941661A (en) * | 2022-06-13 | 2022-08-26 | 贵州永红航空机械有限责任公司 | Combined shaft for dynamic balance test of oil mist separator impeller |
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