Compressor shaft sleeve and machining method thereof

Abstract

The invention belongs to the technical field of compressor / rotor part maintenance, and particularly provides a compressor shaft sleeve and a machining method thereof. The shaft sleeve comprises a first sealing part; the machining method comprises the steps that the shaft sleeve is assembled on a turning instrument; according to the machining size and the mounting position of the sealing structure in the compressor, an electroplating area and a non-electroplating area needing to be machined of the shaft sleeve are determined; a turning instrument is controlled to turn the electroplating area and the non-electroplating area; electroplating a chromium layer on the surface of the electroplating area; and the surface of the chromium layer is subjected to dehydrogenation treatment, so that machining treatment of the first sealing part is completed. The compressor aims to solve the problem that a rotor is damaged due to rubbing between a stator seal and a rotor shaft sleeve in an existing compressor, the fit clearance of the sealing structure and the shaft sleeve is plated with the chromium layer, so that abrasion of the surface of the rotating shaft sleeve is reduced, the abrasion resistance of rotor parts is effectively improved, and then the service life of the compressor is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of compressor / rotor parts maintenance, and specifically provides a compressor shaft sleeve and a processing method thereof. Background Art

[0002] The sealing structure is the main component to reduce the gap leakage between the compressor rotor and stator. Nowadays, in order to pursue the performance of the compressor, the gap between the rotor and the stator is getting smaller and smaller, which easily causes scratches between the stator seal and the rotor parts, especially the shaft sleeve installed on the outer periphery of the rotor. Since the sealing structure is directly installed with the shaft sleeve, the shaft sleeve is very likely to be scratched with the sealing structure and damaged.

[0003] Generally, the sealing structure includes aluminum alloy seal and carbon ring seal. Since there is a corresponding hardness gradient between the aluminum alloy seal and the rotor material, the damage to the rotor parts is limited, and the damage caused by the aluminum alloy seal structure is usually ignored. However, the carbon ring seal has a relatively high hardness, which can easily cause scratches between the stator seal and the rotor, thereby reducing the service life of the compressor. Therefore, a shaft sleeve is urgently needed to solve the above problem. Summary of the invention

[0004] One purpose of the present invention is to solve the problem of rotor damage caused by scratches between the stator seal and the rotor sleeve in the existing compressor.

[0005] To achieve the above object, the present invention provides a method for processing a compressor sleeve, wherein the sleeve is used in a compressor; the sleeve includes a first sealing portion; and the processing method includes:

[0006] assembling the sleeve onto a turning machine;

[0007] Determine the electroplating area and non-electroplating area of ​​the sleeve to be processed according to the processing size and installation position of the sealing structure in the compressor;

[0008] Controlling the turning device to turn the electroplating area and the non-electroplating area;

[0009] Electroplating a chromium layer on the surface of the electroplating area;

[0010] The surface of the chromium layer is subjected to a dehydrogenation treatment to complete the processing of the first sealing portion.

[0011] Furthermore, the step of controlling the turning device to turn the electroplated area and the non-electroplated area includes: determining a preset target diameter D and a target length L of the sleeve; controlling the turning device to perform preliminary turning on the sleeve; controlling the turning device to turn the electroplated area, and then controlling the turning device to turn the non-electroplated area.

[0012] Furthermore, the step of controlling the turning device to perform preliminary turning on the sleeve includes: the outer diameter of the sleeve after preliminary turning is (D+4) mm to (D+8) mm, and the length is (L+4.3) mm to (L+6.4) mm.

[0013] Furthermore, the electroplating area includes an end face A2; the step of turning the electroplating area to obtain an electroplating tank includes: determining the length S of the sealing structure, turning the outer surface of the end face A2 of the electroplating area, and turning the outer diameter D3 of the end face A2 to (D-0.36) mm to (D-0.26) mm, and turning the length L2 to S mm.

[0014] Furthermore, the non-electroplating area includes end faces A1 and A3; the end faces A1 and A3 are respectively located at the two ends of the end face A2; the step of controlling the turning device to turn the non-electroplating area includes: turning the outer surfaces of the end faces A1 and A3 of the non-electroplating area, and turning the outer diameters D2 of the end faces A1 and A3 to (D+0.06) mm to (D+0.12) mm, the length L1 of the end face A1 is turned to 4 mm to 6 mm, and the length L3 of the end face A3 is turned to (L1+0.3) mm to (L1+0.4) mm.

[0015] Furthermore, the step of controlling the turning device to turn the non-electroplating area also includes: turning the chamfer at the edge of the sleeve, and controlling the angle range of the chamfer α to be 30° to 60°.

[0016] Furthermore, after the step of turning the electroplated area and the non-electroplated area is completed and before the step of electroplating a chromium layer on the surface of the electroplated area, it also includes: performing protective treatment on the non-electroplated area of ​​the sleeve.

[0017] Furthermore, the step of performing protective treatment on the non-electroplating area of ​​the sleeve includes: installing baffles at both ends of the sleeve; and wrapping the non-electroplating area of ​​the sleeve with insulating tape.

[0018] Furthermore, the step of installing baffles at both ends of the shaft sleeve includes: opening an inner hole with an internal thread of model M60mm on each of the baffles; passing a stud bolt of model M60mm through the inner holes of the two baffles and the shaft sleeve to install the two baffles to the two ends of the shaft sleeve; tightening nuts of model M60 mm to both ends of the stud bolts; wherein the baffles, the stud bolts and the nuts are all made of insulating materials.

[0019] Further, the thickness of the electroplated chromium layer is set to 0.2 to 0.3 mm, and the hardness is set to HRC60; and / or, the temperature of the dehydrogenation treatment is set to 180° C. and kept at a constant temperature for 4 hours.

[0020] Furthermore, after the step of performing dehydrogenation treatment on the surface of the chromium layer, the method further includes: fitting the processed sleeve onto the compressor main shaft; and turning the length L3 of the end surface A3 to 0.3 mm to 0.4 mm.

[0021] Furthermore, the shaft sleeve also includes a second sealing portion; the processing method also includes: according to a preset target size of the second sealing portion, turning the surface of the second sealing portion into an undulating shape; wherein the outer diameter of the second sealing portion is D1.

[0022] Furthermore, a compressor sleeve is made by the processing method of a compressor sleeve described in any one of the above texts; the compressor includes a seal, and the seal includes an aluminum alloy sealing structure and a carbon ring sealing structure; the sleeve includes a first sealing part and a second sealing part; the first sealing part is connected to the carbon ring sealing structure, and the second sealing part is connected to the aluminum alloy sealing structure.

[0023] Based on the foregoing description, those skilled in the art can understand that in the aforementioned technical solution of the present invention, by processing the electroplating tank on the surface of the sleeve and plating a chrome layer in the electroplating tank, the wear of the sealing structure in the compressor on the surface of the rotor sleeve is reduced, the wear resistance of the rotor parts is effectively improved, and the service life of the compressor is thereby increased. Furthermore, the present invention preferably deposits chromium with relatively stable and good uniformity as the plating material, effectively avoiding the situation where other plating materials are used, which may cause cracks when machining the end face of the sleeve. In addition, the present invention strictly regulates the machining dimensions of the sleeve, so that the first-time qualified rate of the machining sleeve can reach 100%, which reduces the machining cost of the sleeve to a certain extent and is conducive to large-scale production in factories. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present invention, some embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the same reference numerals indicate the same or similar components or parts in different drawings; the drawings of the present invention are not necessarily drawn to scale.

[0025] In the attached figure:

[0026] Figure 1 is a flow chart of a compressor sleeve processing method in some embodiments of the present invention;

[0027] Figure 2 is a schematic diagram of the structure of a compressor in some embodiments of the present invention;

[0028] Figure 3 yes Figure 2 Schematic diagram of the processing dimensions of the middle shaft sleeve;

[0029] Figure 4 It is a structural diagram of the shaft sleeve protection treatment;

[0030] Figure 5 yes Figure 2 A schematic diagram of the structure of the first sealing portion of the middle sleeve after processing;

[0031] Figure 6 yes Figure 2 Schematic diagram of the structure of the second sealing part of the middle sleeve after processing.

[0032] Description of reference numerals:

[0033] 100. Compressor;

[0034] 1. Rotor main shaft; 2. Aluminum alloy sealing structure; 3. Carbon ring sealing structure 3; 4. Bushing; 41. Plating tank; m-non-plating area; n-plating area; 42. First sealing part; 43. Second sealing part; 5. Baffle; 6. Stud bolt; 7. Nut. DETAILED DESCRIPTION

[0035] It should be understood by those skilled in the art that the embodiments described below are only some embodiments of the present invention, rather than all embodiments of the present invention, and these embodiments are intended to explain the technical principles of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present invention.

[0036] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Refer to the following Figures 1 to 6 , to describe in detail the compressor sleeve processing method in some embodiments of the present invention. Figure 1 is a flow chart of a compressor sleeve processing method in some embodiments of the present invention;

[0039] Figure 2 is a schematic diagram of the structure of a compressor in some embodiments of the present invention; Figure 3 yes Figure 2 Schematic diagram of the processing dimensions of the middle shaft sleeve; Figure 4 It is a structural diagram of the shaft sleeve protection treatment; Figure 5 yes Figure 2 A schematic diagram of the structure of the first sealing portion of the middle sleeve after processing; Figure 6 yes Figure 2 Schematic diagram of the structure of the second sealing part of the middle sleeve after processing.

[0040] It should be noted that, for the convenience of description and to enable those skilled in the art to quickly understand the technical solution of the present invention, the following text only describes the technical features that are strongly related (directly or indirectly related) to the technical problem and / or technical concept to be solved by the present invention, and will not describe the technical features that are weakly related to the technical problem and / or technical concept to be solved by the invention. Since the technical features with a weaker degree of correlation belong to the common knowledge in the field, even if the present invention does not describe the features with a weaker degree of correlation, it will not lead to insufficient disclosure of the present invention.

[0041] like Figure 1 As shown, in some embodiments of the present invention, a method for processing a shaft sleeve 4 of a compressor 100 is provided, wherein the shaft sleeve 4 includes a first sealing portion 42; the shaft sleeve 4 is used in the compressor 100; and the processing method includes:

[0042] Step S110, assembling the sleeve 4 onto the turning machine.

[0043] Step S120 , determining the electroplating area n and the non-electroplating area m of the sleeve 4 to be processed according to the processing size and installation position of the sealing structure in the compressor 100 .

[0044] like Figure 2As shown, the sealing structure on the shaft sleeve 4 of the present invention includes an aluminum alloy sealing structure 2 and a carbon ring sealing structure 3. Since the aluminum alloy sealing structure 2 and the rotor material have a corresponding hardness gradient, the damage caused to the rotor parts is limited, and the damage caused by the aluminum alloy sealing structure 2 is usually ignored. Due to the relatively high hardness of the carbon ring seal, the carbon ring sealing structure 3 is very likely to cause serious scratches on the rotor parts, especially the shaft sleeve sleeved on the outer periphery of the rotor. Therefore, the wear resistance of the rotor parts can be improved by chrome plating the matching installation position (i.e., the first sealing portion 42) of the carbon ring sealing structure 3 on the rotor part (i.e., the shaft sleeve), thereby preventing the carbon ring sealing structure 3 from damaging the rotor parts.

[0045] Therefore, in some embodiments of the present invention, Figure 4 As shown, the electroplated area n is the matching installation position of the carbon ring sealing structure 3 on the sleeve 4 (i.e., the first sealing portion 42), and the non-electroplated area m is other parts except the installation position of the carbon ring sealing structure 3 (including the second sealing portion 43 connected to the aluminum alloy sealing structure 2).

[0046] Of course, since the aluminum alloy sealing structure 2 and the rotor material have a corresponding hardness gradient, there is still a certain damage to the rotor. Therefore, technical personnel in this field may also perform chrome plating on the second sealing part 43 as needed, that is, the electroplating area n is the matching installation position of the aluminum alloy sealing structure 2 and the carbon ring sealing structure 3, and the non-electroplating area m is other parts except the installation positions of the aluminum alloy sealing structure 2 and the carbon ring sealing structure 3.

[0047] First, the preset dimensions of the required sleeve 4 are obtained, that is, the preset target diameter D and target dimension L. Then, the diameter, width and thickness of the sealing structure are measured, and the diameter, width and groove depth of the electroplating tank 41 formed by the electroplating area n are calculated by the measured diameter, width and thickness, so as to confirm the actual diameter and actual length of the sleeve 4 before chrome plating (that is, the diameter and length obtained by preliminary turning).

[0048] like Figure 3 As shown, the electroplating tank 41 includes an end face A1, an end face A2 and an end face A3. Among them, the end face A1 and the end face A3 are the end faces of the electroplating tank 41, and the end face A2 is the tank body of the electroplating tank 41, that is, the end face A1 and the end face A3 are the non-electroplating area m, and the end face A2 is the electroplating area n. The final diameter and length of each end face are calculated by the size and installation position of the sealing structure. Among them, the diameters of the end face A1 and the end face D3 are the same, that is, the diameters of the end face A1 and the end face D3 are both D2. The length of the end face A1 is L1, and the length of the end face A3 is L3. The diameter of the end face A2 is D3, and the length is L2.

[0049] Step S130, controlling the turning device to turn the electroplating area n and the non-electroplating area m.

[0050] Wherein, step S130 includes:

[0051] Step S131 , determining a preset target diameter D and a target length L of the sleeve 4 .

[0052] Step S132, according to the target diameter D and the target length L, the turning device is controlled to perform preliminary turning on the sleeve 4. The outer diameter of the sleeve 4 after preliminary turning is (D+4) mm to (D+8) mm, and the length of the sleeve 4 after preliminary turning is (L+4.3) mm to (L+6.4) mm.

[0053] Among them, during the preliminary turning, a margin of 0.03mm to 0.04mm can be reserved according to the calculated size. It should be noted that the length of the sleeve 4 after preliminary turning is (L+L3)mm. Since the length L3 of the end face A3 is (L1+0.3)mm to (L1+0.4)mm, and the length L1 of the end face A1 is 4mm to 6mm, the length of the sleeve 4 after preliminary turning here is (L+4.3)mm to (L+6.4)mm.

[0054] Step S133, controlling the turning device to turn the electroplating area n, and then controlling the turning device to turn the non-electroplating area m.

[0055] Specifically, the electroplating area n includes the end face A2. The step of "controlling the turning device to turn the electroplating area n" in step S133 includes: determining the length S of the sealing structure, where the sealing structure is the carbon ring sealing structure 3. Turning the outer surface of the end face A2 of the electroplating area n, and turning the outer diameter D3 of the end face A2 to (D-0.36) mm to (D-0.26) mm, and turning the length L2 to S mm.

[0056] Specifically, the non-electroplating area m includes end faces A1 and A3, and the end faces A1 and A3 are located at both ends of the end face A2. The step of "controlling the turning device to turn the non-electroplating area m" in step S133 also includes: turning the outer surfaces of the end faces A1 and A3 of the non-electroplating area m, and turning the outer diameters D2 of the end faces A1 and A3 to (D+0.06) mm to (D+0.12) mm, turning the length L1 of the end face A1 to 4 mm to 6 mm, and turning the length L3 of the end face A3 to (L1+0.3) mm to (L1+0.4) mm.

[0057] Among them, the step of "controlling the turning equipment to turn the non-electroplating area m" in step S133 also includes: turning the chamfer at the edge of the sleeve 4, and controlling the angle range of the chamfer α to be 30° to 60°.

[0058] Step S140, electroplating a chromium layer on the surface of the electroplating area n. The thickness of the electroplated chromium layer is set to 0.2 to 0.3 mm, and the hardness is set to HRC60.

[0059] Step S150, dehydrogenation treatment is performed on the surface of the chromium layer to complete the processing of the first sealing portion 42. The sleeve 4 is placed in an oven or in hot oil for dehydrogenation treatment. The dehydrogenation treatment temperature is set to 180°C and kept at a constant temperature for 4 hours. This step obtains Figure 5 The shaft sleeve 4 structure described in.

[0060] Wherein, after step S130 and before step S140, the method further includes:

[0061] Step S160 , performing protective treatment on the non-electroplating area m of the sleeve 4 .

[0062] Step S160 includes:

[0063] Step 161, baffles 5 are installed at both ends of the shaft sleeve 4. An inner hole with an M60mm internal thread is opened on each baffle 5, and stud bolts 6 with a model number of M60mm are passed through the inner holes of the two baffles 5 and the shaft sleeve 4 to install the two baffles 5 to the two ends of the shaft sleeve 4; then, nuts 7 with a model number of M60 mm are tightened on both ends of the stud bolts 6 to make the baffle 5 fit tightly with the ends of the shaft sleeve 4.

[0064] The baffle 5, stud bolts 6 and nuts 7 are all made of insulating materials.

[0065] Step 162 , wrapping the non-electroplating area m of the shaft sleeve 4 with insulating tape.

[0066] In some further embodiments of the present invention, after step S150, the following steps are further included:

[0067] Step S170, assembling the processed sleeve onto the main shaft of the compressor;

[0068] Step S180, turning the length L3 of the end surface A3 to 0.3 mm to 0.4 mm.

[0069] In other embodiments of the present invention, the sleeve 4 further includes a second sealing portion 43; and the processing method further includes:

[0070] Step S210, according to the preset target size of the second sealing part 43, the surface of the second sealing part 43 is turned into a concave and convex shape; wherein the outer diameter of the second sealing part 43 is D1. The preset target size of the second sealing part 43 can be obtained according to the drawings of the existing aluminum alloy seal 2 matching structure or according to the experience of the operator. This step obtains Figure 6 The shaft sleeve 4 structure shown in FIG.

[0071] In another embodiment of the present invention, a compressor sleeve 4 is provided, which is made by the above-mentioned processing method of the compressor sleeve 4. The sleeve 4 is used in the compressor 100, such as Figure 2 As shown, the sleeve 4 is arranged between the stator sealing structure and the rotor in the compressor 100 , the rotor includes a rotor main shaft 1 , and the sleeve 4 is arranged on the outer periphery of the rotor of the compressor 100 .

[0072] The compressor 100 includes a seal, which includes an aluminum alloy seal structure 2 and a carbon ring seal structure 3. The shaft sleeve 4 includes a first seal portion 42 and a second seal portion 43, wherein the first seal 42 is connected to the carbon ring seal structure 3, and the second seal portion 43 is connected to the aluminum alloy seal structure 2.

[0073] It can be understood by those skilled in the art that the present invention reduces the wear of the sealing structure in the compressor 100 on the surface of the rotor sleeve 4 by processing the electroplating tank 41 and plating a chrome layer in the electroplating tank 41, thereby effectively improving the wear resistance of the rotor parts and thus improving the service life of the compressor 100. Furthermore, the present invention preferably deposits chromium with relatively stable and good uniformity as the plating material, effectively avoiding the situation that other plating materials are prone to cracking when processing the end face of the sleeve 4. In addition, the present invention strictly regulates the processing size of the sleeve 4, so that the first-time qualified rate of the sleeve 4 can reach 100%, which reduces the processing cost of the sleeve 4 to a certain extent, and is conducive to large-scale production in factories.

[0074] So far, the technical solution of the present invention has been described in combination with the above multiple embodiments, but it is easy for those skilled in the art to understand that the protection scope of the present invention is not limited to these specific embodiments. Without departing from the technical principles of the present invention, those skilled in the art can split and combine the technical solutions in the above embodiments, and can also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present invention will fall within the protection scope of the present invention.

Claims

1. A method for processing a compressor sleeve, characterized in that: The sleeve is used in a compressor; the sleeve includes a first sealing portion; the processing method includes: assembling the sleeve onto a turning machine; Determining the electroplating area and non-electroplating area to be processed on the sleeve according to the processing size and installation position of the sealing structure in the compressor; Controlling the turning device to turn the electroplating area and the non-electroplating area; Electroplating a chromium layer on the surface of the electroplating area; The surface of the chromium layer is subjected to a dehydrogenation treatment to complete the processing of the first sealing portion.

2. The method for processing a compressor sleeve according to claim 1, characterized in that: The step of controlling the turning device to turn the electroplating area and the non-electroplating area comprises: Determine a preset target diameter D and a target length L of the sleeve; Controlling the turning device to perform preliminary turning on the sleeve; The turning device is controlled to turn the electroplating area, and then the turning device is controlled to turn the non-electroplating area.

3. The method for processing a compressor sleeve according to claim 2, characterized in that: The step of controlling the turning device to perform preliminary turning on the sleeve comprises: After preliminary turning, the outer diameter of the sleeve is (D+4) mm to (D+8) mm, and the length is (L+4.3) mm to (L+6.4) mm.

4. The method for processing a compressor sleeve according to claim 2, characterized in that: The electroplating area includes an end surface A2; The step of turning the electroplating area to obtain the electroplating tank comprises: Determine the length S of the sealing structure, The outer surface of the end face A2 of the electroplating area is turned, and the outer diameter D3 of the end face A2 is turned to (D-0.36) mm to (D-0.26) mm, and the length L2 is turned to S mm.

5. The method for processing a compressor sleeve according to claim 2, characterized in that: The non-electroplating area includes end surfaces A1 and A3; the end surface A1 and the end surface A3 are respectively located at two ends of the end surface A2; The step of controlling the turning device to turn the non-electroplating area comprises: The outer surfaces of the end faces A1 and A3 of the non-electroplating area are turned, and the outer diameters D2 of the end faces A1 and A3 are turned to (D+0.06) mm to (D+0.12) mm, the length L1 of the end face A1 is turned to 4 mm to 6 mm, and the length L3 of the end face A3 is turned to (L1+0.3) mm to (L1+0.4) mm.

6. The method for processing a compressor sleeve according to claim 2, characterized in that: The step of controlling the turning device to turn the non-electroplating area also includes: The chamfer at the edge of the sleeve is turned, and the angle range of the chamfer α is controlled to be 30° to 60°.

7. The method for processing a compressor sleeve according to claim 1, characterized in that: After the turning step of the electroplating area and the non-electroplating area is completed, and before the step of electroplating a chromium layer on the surface of the electroplating area, the method further comprises: The non-electroplating area of ​​the sleeve is subjected to protective treatment.

8. The method for processing a compressor sleeve according to claim 7, characterized in that: The step of performing protective treatment on the non-electroplating area of ​​the sleeve comprises: Baffles are installed at both ends of the shaft sleeve; The non-plated area of ​​the sleeve is wrapped with insulating tape.

9. The method for processing a compressor sleeve according to claim 8, characterized in that: The step of installing baffles at both ends of the shaft sleeve comprises: An inner hole having an internal thread of M60 mm is provided on each of the baffles; Passing stud bolts of model M60 mm through the inner holes of the two baffles and the shaft sleeve to install the two baffles to the two ends of the shaft sleeve; Tighten the M60 mm nuts onto both ends of the stud bolts; Wherein, the baffle, the stud bolt and the nut are all made of insulating material.

10. A compressor sleeve, characterized in that: Made by the processing method of a compressor sleeve according to any one of claims 1 to 9; the compressor comprises a seal, and the seal comprises an aluminum alloy seal structure and a carbon ring seal structure; The sleeve includes a first sealing portion and a second sealing portion; The first sealing portion is connected to the carbon ring sealing structure, and the second sealing portion is connected to the aluminum alloy sealing structure.

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