Disassembling and assembling tool for impeller of centrifugal compressor

Abstract

A dismounting seal A and a dismounting seal B are mounted on the mounting surface of an impeller shaft and the mounting surface of the impeller, and an oil hole of the impeller shaft leads to the mounting surface between the dismounting seal A and the dismounting seal; the impeller shaft is fixedly connected with a dismounting core shaft, and a core shaft oil hole in the dismounting core shaft is communicated with the impeller shaft oil hole; a dismounting piston is movably sleeved on the dismounting mandrel, a cylinder body is sleeved on the outer side of the dismounting piston, a cylinder cover is hermetically fixed at one end of the cylinder body, and the cylinder cover is fixedly arranged on the dismounting mandrel; and the outward extending end of the dismounting piston can be fixedly connected with the impeller. The sealing sliding end of the detachable piston is movably located in a cylinder cavity defined by the cylinder body, the detachable mandrel and the cylinder cover, and the outward extending end of the detachable piston extends out of the cylinder body and can be fixedly connected with the impeller. The outward extending end of the detachable piston is fixedly connected with a transition plate, and the transition plate can be fixedly connected with the impeller. The disassembling and assembling tool can generate radial external expansive force and axial drawing force on the impeller, and is particularly suitable for disassembling and assembling the impeller of the centrifugal compressor.

Description

TECHNICAL FIELD

[0001] The utility model relates to the maintenance installation tool of centrifugal compressor especially relates to a kind of dismounting and assembling tool for three-dimensional flow centrifugal compressor impeller. BACKGROUND

[0002] Centrifugal compressor is widely used in various industries, and impeller is the heart of centrifugal compressor. Three-dimensional flow impeller is an advanced impeller, which has high efficiency and wide operating range, and can meet the operating requirements of large flow and high pressure ratio.

[0003] To obtain high compression ratio and high energy head, the rotational speed of the impeller of centrifugal compressor is usually up to 20000 RPM, which requires high bearing capacity and excellent centering between the impeller and the impeller shaft. Therefore, the existing impellers are usually installed on the impeller shaft through interference fit with large interference amount. The interference fit of the impeller on the impeller shaft can generate a large clamping force, so that the impeller maintains good stability during cooperation and operation. The impeller also transmits a large torque and load through interference fit to withstand high load during high-speed operation. However, the interference fit between the impeller and the impeller shaft requires a certain clamping deformation to achieve tight fit, so the assembly and maintenance disassembly of the impeller are very difficult. Using a similar drawing tool to disassemble and assemble the impeller is difficult to disassemble and assemble, and is easy to cause deformation and damage of the impeller and the impeller shaft, resulting in imbalance, vibration and noise during high-speed operation of the impeller, and reducing the operating efficiency of the compressor. SUMMARY

[0004] In view of the above problems existing in the prior art, the technical problem to be solved by the utility model is to provide a centrifugal compressor impeller dismounting tool capable of generating radial outward expansion force and axial pulling force.

[0005] To solve the above technical problems, the centrifugal compressor impeller dismounting tool of the utility model comprises an impeller shaft and an impeller installed on the impeller shaft. A dismounting and assembling seal A and a dismounting and assembling seal B are installed on the installation surface of the impeller shaft and the impeller at a distance. An impeller shaft oil hole on the impeller shaft is connected to the installation surface between the dismounting and assembling seal A and the dismounting and assembling seal. A dismounting and assembling core shaft is fixedly connected to the impeller shaft. A core shaft oil hole on the dismounting and assembling core shaft is in communication with the impeller shaft oil hole. A dismounting and assembling piston is movably sleeved on the dismounting and assembling core shaft. A cylinder is sleeved on the outside of the dismounting and assembling piston. A cylinder cover is sealingly fixed to one end of the cylinder. The cylinder cover is fixedly installed on the dismounting and assembling core shaft. The outer end of the dismounting and assembling piston is fixedly connected with the impeller.

[0006] Further, the sealing sliding end of the folding piston is movably located in the cylinder cavity surrounded by the cylinder body, the folding mandrel and the cylinder cover, and the outer end of the folding piston extends out of the cylinder body and is fixedly connected with the impeller.

[0007] Further, the outer end of the folding piston is fixedly connected with a transition plate through a piston bolt, and the transition plate is fixedly connected with the impeller through a folding bolt.

[0008] Further, the folding mandrel and the impeller shaft are fixedly and rotatably connected with each other, the folding mandrel and the impeller shaft are in the same straight line, and an inter-shaft seal is installed on the contact sealing surface of the folding mandrel and the impeller shaft.

[0009] Further, the cylinder body is provided with an oil hole A and an oil hole B, the cylinder cover is fixedly connected with the cylinder body through a cylinder cover bolt, and the outer end of the folding mandrel is rotatably connected with a cylinder cover nut.

[0010] Further, the cylinder cover and the folding mandrel are embedded with a cylinder cover inner seal, and the cylinder cover and the cylinder body are embedded with a cylinder cover outer seal.

[0011] Further, the disassembly and assembly seals A and B, the inter-shaft seal, the cylinder cover outer seal and the cylinder cover inner seal are static seals.

[0012] Further, the folding piston and the folding mandrel are installed with piston inner seals A and B, the folding piston and the cylinder body are installed with piston outer seals A and B, the piston outer seal A and the piston inner seal A are located in the cylinder cavity, and the piston outer seal B and the piston inner seal B are located at the outer end of the folding piston.

[0013] Further, the piston outer seal A, the piston inner seal A, the piston outer seal B and the piston inner seal B are composed of a metal gasket and an O-shaped seal ring.

[0014] With the above structure, the installation surface between the impeller shaft and the impeller is installed with the dismounting seal A and the dismounting seal B; thus, the opposite impeller shaft surface and the impeller installation hole surface, and the dismounting seal A and the dismounting seal B enclose an expansion chamber; when the high-pressure hydraulic oil enters the expansion chamber through the impeller shaft oil hole, the high-pressure hydraulic oil generates a hydraulic pressure to expand the impeller installation hole outward, the impeller installation surface is expanded, the impeller and the impeller shaft are separated on the installation surface, the clamping effect between the impeller and the impeller shaft is greatly weakened, and the axial movement of the impeller on the impeller shaft is facilitated. Since the piston end of the dismounting piston fixedly connected with the impeller is located in the cylinder cavity enclosed by the cylinder body, the cylinder cover and the dismounting core shaft, when the hydraulic oil enters the cylinder cavity through the oil inlet and outlet, the dismounting piston can be pushed to move along the axial direction of the impeller shaft; when the dismounting piston pulls the impeller on the impeller shaft to move outward, the impeller can be dismounted from the impeller shaft; and when the dismounting piston pushes the impeller on the impeller shaft to move inward, the impeller can be pressed and mounted on the impeller shaft. On one hand, the outward pulling force or the inward pushing force generated by the dismounting piston is along the axial direction of the impeller shaft, and the assembly or disassembly of the impeller is facilitated; on the other hand, the hydraulic element is used to generate the dismounting force, the dismounting force can be controlled and adjusted, and the dismounting force is balanced. In the utility model, the hydraulic action on the impeller can generate the outward expansion separation effect of the impeller hole and the stable axial pushing and pulling effect, the assembly and disassembly of the impeller on the impeller shaft are more facilitated, the dismounting efficiency of the impeller is improved, and the assembly and disassembly of the impeller are protected. BRIEF DESCRIPTION OF DRAWINGS

[0015] The centrifugal compressor impeller dismounting tool of the utility model will be further described below in combination with the drawings and specific embodiments.

[0016] Figure 1 is an assembly structure diagram of the centrifugal compressor impeller dismounting tool of the utility model in a specific embodiment;

[0017] Figure 2 is Figure 1 a cylinder body main sectional view in the embodiment shown in the figure;

[0018] Figure 3 is Figure 2 a left view of the figure;

[0019] Figure 4 is Figure 1 a front view of the dismounting piston in the embodiment shown in the figure;

[0020] Figure 5 is Figure 4 a left view of the figure;

[0021] Figure 6 is Figure 1 a front view of the dismounting core shaft in the embodiment shown in the figure.

[0022] In the diagram, 1—impeller shaft, 2—impeller shaft oil hole, 3—disassembly and assembly seal A, 4—impeller, 5—disassembly and assembly seal B, 6—disassembly and assembly bolt, 7—transition plate, 8—cylinder body, 9—oil hole A, 10—disassembly and assembly piston, 11—oil hole B, 12—cylinder head, 13—disassembly and assembly spindle, 14—cylinder head nut, 15—spindle oil hole, 16—cylinder head inner seal, 17—cylinder head outer seal, 18—cylinder head bolt, 19—piston outer seal A, 20—piston inner seal A, 21—piston bolt, 22—piston outer seal B, 23—piston inner seal B, 24—shaft seal, 25—piston bore, 26—cylinder bore sealing groove. Detailed Implementation

[0023] like Figure 1 The centrifugal compressor impeller assembly / disassembly fixture shown includes an impeller shaft 1, which serves as the power output shaft of the compressor. An impeller 4 is fixedly mounted on the impeller shaft 1 using a heat-fitting process with an interference fit. An impeller shaft oil hole 2 is provided on the impeller shaft 1, comprising an axial hole and a radial hole that communicate with each other. The oil inlet of the impeller shaft oil hole 2 is located at the end of the impeller shaft 1, and the oil outlet of the impeller shaft oil hole 2 leads to the mounting surface between the disassembly seal A3 and the disassembly seal B5. The disassembly seal A3 is embedded in the mounting hole wall of the impeller 4, and the disassembly seal B5 is embedded in the impeller shaft 1. Disassembly seals A3 and B5 are O-rings, but other static seals can also be used. When high-pressure oil is supplied to the impeller oil hole 2, the mounting hole surface of the impeller 2 between the disassembly seals A3 and B5 is pushed away from the impeller shaft 1, forming an oil gap space.

[0024] A detachable mandrel 13 is screwed onto the extended end of the impeller shaft 1. For example... Figure 6 As shown, the disassembly and assembly mandrel 13 has an axially arranged mandrel oil hole 15. The outer end of the mandrel oil hole 15 is connected to a high-pressure oil source. The connection port of the mandrel oil hole 15 is opposite to and connected to the oil inlet port of the impeller shaft oil hole 2. A threaded section for screwing on the cylinder head nut 14 is provided at the outer end of the disassembly and assembly mandrel 13. An external thread is provided at the extended end of the impeller shaft 1, and a threaded hole is provided at the connection end of the disassembly and assembly mandrel 13. The threaded hole is screwed on to the external thread of the impeller shaft 1. An inter-shaft seal 24 is installed on the contact sealing surface between the internal thread of the disassembly and assembly mandrel 13 and the external thread end of the impeller shaft 1. The inter-shaft seal 24 surrounds the outer periphery of the docking port of the mandrel oil hole 15 and the impeller shaft oil hole 2.

[0025] A disassembly piston 10 is movably mounted on the disassembly spindle 13. For example... Figure 4 , Figure 5As shown, the disassembly / assembly piston 10 has a cup-shaped structure, including a sealing sliding end and an extended end. The sealing sliding end of the disassembly / assembly piston 10 is located at the bottom of the cup, and the extended end is located at the mouth of the cup. The bottom of the cup of the disassembly / assembly piston 10 is provided with a through hole through the disassembly / assembly mandrel 13. A piston inner seal A20 is embedded in the wall of the through hole at the bottom of the cup corresponding to the disassembly / assembly mandrel 13, and a piston inner seal B23 is embedded in the disassembly / assembly mandrel 13 opposite to the inner wall of the mouth of the disassembly / assembly piston 10.

[0026] The cylinder block 8 is fitted onto the outside of the piston 10 during disassembly and assembly. For example... Figure 2 , Figure 3 As shown, the cylinder block 8 also has a cup-shaped structure. The cylinder head 12 is fixedly installed on the cup opening of the cylinder block 8 by cylinder head bolts 18. The disassembly and assembly mandrel 13 passes through the extended end of the cylinder head 12 and is screwed with a cylinder head nut 14, which fixes the cylinder head 12 to the disassembly and assembly mandrel 13. The cylinder head 12 and the disassembly and assembly mandrel 13 are equipped with an inner cylinder head seal 16, which is embedded in the cylinder head hole of the cylinder head 12. There is an outer cylinder head seal 17 between the cylinder head 12 and the cylinder block 8, which is embedded in the cylinder head 12. The inner cylinder head seal 16 and the outer cylinder head seal 17 are O-rings, but other static seals can also be used. The bottom of the cylinder body 8 is provided with a piston hole 25 for the disassembly piston 10 to pass through. A cylinder hole sealing groove 26 is provided on the hole wall of the piston hole 25. A piston outer seal B22 is embedded in the cylinder hole sealing groove 26. The piston outer seal B22 is located between the piston hole 25 of the cylinder body 8 and the outer wall surface of the disassembly piston 10 cup opening.

[0027] An external piston seal A19 is provided between the sealing sliding end of the disassembly piston 10 and the inner wall of the cylinder body 8. The external piston seal A19 is fitted onto the disassembly piston 10. The cylinder body 8, the disassembly mandrel 13, and the cylinder head 12 form an annular cylinder cavity. The sealing sliding end of the disassembly piston 10 is located in this cylinder cavity, and the cup end of the disassembly piston 10 extends outward through the gap between the cylinder body 8 and the disassembly mandrel 13. A transition plate 7 is fixedly connected to the cup end of the disassembly piston 10 by piston bolts 21. The transition plate 7 is fitted onto the disassembly mandrel 13, and the transition plate 7 can also be fixedly connected to the impeller 4 by disassembly bolts 6.

[0028] Piston external seal A19, piston internal seal A20, piston external seal B22 and piston internal seal B23 are dynamic seals, which are composed of commonly used metal gaskets and O-rings.

[0029] The above are only some preferred embodiments of this utility model, but this utility model is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A centrifugal compressor impeller assembly / disassembly fixture, comprising an impeller shaft (1) and an impeller (4) mounted on the impeller shaft (1), characterized in that: On the mounting surfaces of the impeller shaft (1) and the impeller (4), disassembly seals A (3) and B (5) are mounted at a distance from each other. The impeller shaft oil hole (2) on the impeller shaft (1) leads to the mounting surface between the disassembly seals A (3) and B (5). A disassembly mandrel (13) is fixedly connected to the impeller shaft (1), and the mandrel oil hole (15) on the disassembly mandrel (13) is connected to the impeller shaft oil hole (2). A disassembly piston (10) is movably mounted on the disassembly mandrel (13), and a cylinder body (8) is mounted on the outside of the disassembly piston (10). A cylinder cover (12) is sealed and fixed at one end of the cylinder body (8), and the cylinder cover (12) is fixedly mounted on the disassembly mandrel (13). The extended end of the disassembly piston (10) can be fixedly connected to the impeller (4).

2. The centrifugal compressor impeller disassembly and assembly fixture according to claim 1, characterized in that: The sealing sliding end of the disassembly piston (10) is movably located in the cylinder cavity formed by the cylinder body (8), the disassembly mandrel (13) and the cylinder head (12). The extended end of the disassembly piston (10) extends out of the cylinder body (8) and can be fixedly connected to the impeller (4).

3. The centrifugal compressor impeller disassembly and assembly fixture according to claim 1 or 2, characterized in that: The extended end of the disassembly piston (10) is fixedly connected to a transition plate (7) by a piston bolt (21), and the transition plate (7) can be fixedly connected to the impeller (4) by a disassembly bolt (6).

4. The centrifugal compressor impeller disassembly and assembly fixture according to claim 1, characterized in that: The disassembly mandrel (13) and the impeller shaft (1) are fixedly screwed together. The disassembly mandrel (13) and the impeller shaft (1) are on the same straight line. An inter-shaft seal (24) is installed on the contact sealing surface of the disassembly mandrel (13) and the impeller shaft (1).

5. The centrifugal compressor impeller disassembly and assembly fixture according to claim 1, characterized in that: The cylinder body (8) is provided with oil holes A (9) and B (11), which lead to the cylinder chambers on both sides of the sealing sliding end of the disassembly piston (10).

6. The centrifugal compressor impeller disassembly and assembly fixture according to claim 1, characterized in that: The cylinder head (12) is fixedly connected to the cylinder body (8) by cylinder head bolts (18), and the cylinder head nut (14) is screwed onto the extended end of the cylinder head (12).

7. The centrifugal compressor impeller disassembly and assembly fixture according to claim 1 or 4, characterized in that: An inner cylinder cover seal (16) is fitted between the cylinder cover (12) and the disassembly mandrel (13), and an outer cylinder cover seal (17) is fitted between the cylinder cover (12) and the cylinder body (8).

8. The centrifugal compressor impeller disassembly and assembly fixture according to claim 7, characterized in that: The disassembly seal A (3), disassembly seal B (5), shaft seal (24), cylinder head outer seal (17), and cylinder head inner seal (16) are static seals.

9. The centrifugal compressor impeller disassembly and assembly fixture according to claim 5, characterized in that: The piston assembly / disassembly piston (10) and the assembly / disassembly spindle (13) are fitted with piston inner seal A (20) and piston inner seal B (23); the piston assembly / disassembly piston (10) and the cylinder body (8) are fitted with piston outer seal A (19) and piston outer seal B (22); piston outer seal A (19) and piston inner seal A (20) are located in the cylinder cavity; piston outer seal B (22) and piston inner seal B (23) are located at the outer end of the assembly / disassembly piston (10).

10. The centrifugal compressor impeller disassembly and assembly fixture according to claim 9, characterized in that: The piston outer seal A (19), piston inner seal A (20), piston outer seal B (22) and piston inner seal B (23) are composed of metal gaskets and O-rings.

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