Compressor upper support alignment device and method

Abstract

The present application relates to the technical field of compressor, and provides a compressor upper support alignment device and an alignment method, the compressor upper support alignment device comprises a first clamp, a second clamp and a connecting assembly; the first clamp comprises a clamp shaft, the clamp shaft is divided into a large-diameter section and a small-diameter section coaxially along the axial direction of the clamp shaft; the large-diameter section is used for matching with a bearing in a mounting hole of the upper support, the outer diameter of the large-diameter section is greater than the outer diameter of the small-diameter section, the outer diameter of the large-diameter section is greater than the outer diameter of the crankshaft and the bearing mounting portion and less than or equal to the inner diameter of the bearing; the second clamp is provided with a mounting cavity, and the mounting cavity is used for accommodating the small-diameter section; and the connecting assembly is used for locking the relative position of the second clamp and the upper support. The device can be adapted to the mounting of the upper support structure with an equal-diameter mounting hole, and the mounting process of the upper support and the crankshaft is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a compressor upper support alignment device and an alignment method. BACKGROUND

[0002] The rotor compressor is widely used due to its advantages of fewer components, simple structure and reliable operation.

[0003] The rotor compressor has a long sealing line, so the installation precision of the crankshaft is required to be high. In the rotor compressor, in order to reduce the deflection of the upper part of the crankshaft, improve the reliability and vibration of the compressor, an upper support is added to the upper part of the crankshaft to support the crankshaft to reduce the deflection of the upper part of the crankshaft, thereby improving the overall stability of the compressor.

[0004] The upper support and the crankshaft require high assembly coaxiality. Therefore, during the assembly of the upper support and the crankshaft, an assembly jig is usually required to assist in aligning the crankshaft to ensure that the assembly coaxiality of the upper support and the crankshaft meets the requirements. The upper support is provided with an assembly hole matched with the crankshaft. In order to cooperate with the assembly jig, the existing assembly hole is usually a stepped hole, the small diameter hole of which is used to match the crankshaft, and the large diameter hole of which is used to match the jig during the assembly of the crankshaft, thereby assisting the crankshaft in alignment. This results in the need for high machining precision of both the large diameter section and the small diameter section of the stepped hole. On the one hand, it limits the machining means of the upper support, and on the other hand, it also makes the machining cost of the upper support high.

[0005] Therefore, improving the assembly hole of the upper support into an equal-diameter hole helps to reduce the machining cost of the upper support. However, if the stepped hole is improved into an equal-diameter hole, the existing assembly jig cannot be used, resulting in an increase in the assembly difficulty of the crankshaft and the upper support.

[0006] Based on the above technical problems, the present application needs a compressor upper support alignment device and an alignment method to adapt to the assembly of the upper support with an equal-diameter assembly hole and simplify the assembly process of the upper support and the crankshaft. SUMMARY

[0007] The present application aims to provide a compressor upper support alignment device and an alignment method to adapt to the assembly of the upper support with an equal-diameter assembly hole and simplify the assembly process of the upper support and the crankshaft, thereby improving the assembly precision of the upper support and the crankshaft.

[0008] The compressor upper support alignment device of the present application comprises a first clamp, a second clamp and a connecting assembly; the first clamp comprises a clamp shaft, which is divided into a large-diameter section and a small-diameter section coaxially along its axial direction; the large-diameter section is used to cooperate with a bearing in the assembly hole of the upper support, the outer diameter of the large-diameter section is larger than that of the small-diameter section, the outer diameter of the large-diameter section is larger than the outer diameter of the crankshaft at the assembly position with the bearing and is smaller than or equal to the inner diameter of the bearing; the second clamp is provided with an assembly cavity, which is used to accommodate the small-diameter section, the inner diameter of the assembly cavity matches the inner diameter of the small-diameter section and the outer diameter of the crankshaft at the assembly position with the assembly cavity; the connecting assembly is used to lock the relative position of the second clamp and the upper support after the small-diameter section is accommodated in the assembly cavity. The compressor upper support alignment device described above is a upper-lower split structure composed of the first clamp and the second clamp, so that the adjustment device does not occupy the assembly hole of the upper support during the auxiliary alignment process (the first clamp is removed during the alignment process), is suitable for the assembly of the upper support with an equal-diameter assembly hole, makes it possible to keep a high assembly precision between the upper support with an equal-diameter assembly hole and the crankshaft, is beneficial to reduce the processing difficulty and cost of the upper support, and also expands the processing methods (stamping and machining) of the upper support. The alignment device has a simple structure and is convenient to use, which is helpful to simplify the assembly process of the upper support and the crankshaft.

[0009] Optionally, the nominal diameter of the large-diameter section is D1, and the minimum limit size of D1 is D1min;

[0010] D2max / 2≤D1min / 2≤kmin+D2max / 2 is satisfied;

[0011] The kmin is the theoretical minimum value of the single-side gap between the outer peripheral surface of the crankshaft and the inner peripheral surface of the bearing after the assembly of the crankshaft and the bearing is completed;

[0012] The D2max is the maximum limit size of the outer diameter of the crankshaft at the assembly position with the bearing.

[0013] Optionally, the assembly gap of the large-diameter section and the bearing is a first gap, the assembly gap of the crankshaft and the bearing is a second gap, and the difference between the second gap and the first gap is at least 30 um;

[0014] And / or, the assembly gap of the small-diameter section and the assembly cavity is less than 30 um.

[0015] Optionally, the first clamp further comprises a seat body, the seat body is provided with a first assembly surface,

[0016] One end of the large diameter section is connected with the first assembly surface of the seat body, and the other end is connected with the small diameter section, the central axis of the clamp shaft is perpendicular to the first assembly surface, and the radial outer dimension of the seat body along the radial direction of the clamp shaft is greater than the inner diameter of the assembly hole of the upper support;

[0017] And / or, one end of the small diameter section away from the large diameter section is a guide part along the axial direction thereof, and the outer diameter of the guide part gradually decreases from the side close to the large diameter section to the side away from the large diameter section along the axial direction of the small diameter section.

[0018] Optionally, a first groove is formed on the seat body and surrounds the large diameter section on the first assembly surface. The first groove is arranged to help reduce the area of the first assembly surface, thereby reducing the effective contact area between the first clamp and the upper support and improving the planeness matching of the two.

[0019] Optionally, the second clamp has a second assembly surface, and the second assembly surface is perpendicular to the central axis of the assembly cavity.

[0020] Optionally, a plurality of connecting holes are formed through the second assembly surface of the second clamp, and the connecting assembly connects the second clamp and the upper support through the connecting holes, and the central axis of the connecting hole is perpendicular to the second assembly surface.

[0021] Optionally, the second clamp comprises a sleeve and an assembly part, and the inner cavity of the sleeve serves as the assembly cavity.

[0022] The first end of the sleeve serves as an opening end, the assembly part is connected to the opening end of the sleeve and extends along the radial direction of the sleeve, and the second assembly surface is located on the assembly part.

[0023] Optionally, a second groove is formed on the second assembly surface and surrounds the opening of the sleeve;

[0024] And / or, a gas hole is formed on the second end of the sleeve along the axial direction thereof, and the gas hole is in communication with the assembly cavity.

[0025] And / or, the side of the assembly cavity close to the first end of the sleeve is in a counterbore structure gradually increasing outward.

[0026] The application also provides a method for adjusting the center, which comprises the following steps:

[0027] The first clamp is installed, the large diameter section of the clamp shaft is installed into the bearing in the assembly hole of the upper support, and at least a part of the small diameter section passes through the assembly hole of the upper support;

[0028] The second clamp is installed, so that the assembly cavity of the second clamp is matched with the small diameter section.

[0029] locking the relative position of the second clamp and the upper support through the connecting assembly;

[0030] removing the first clamp, installing the crankshaft into the bearing, and making the end of the crankshaft fit into the assembly cavity;

[0031] installing the upper support into the compressor shell, and removing the second clamp.

[0032] In summary, the compressor upper support aligning device comprises a first clamp, a second clamp, and a connecting assembly. The first clamp comprises a clamp shaft, which is divided into a large-diameter section and a small-diameter section coaxially along the axial direction. The large-diameter section is used to fit into the bearing in the assembly hole of the upper support. The outer diameter of the large-diameter section is larger than that of the small-diameter section. The outer diameter of the large-diameter section is larger than the outer diameter of the crankshaft at the assembly position with the bearing and is smaller than or equal to the inner diameter of the bearing. The second clamp is provided with an assembly cavity, which is used to accommodate the small-diameter section. The inner diameter of the assembly cavity matches the inner diameter of the small-diameter section and the outer diameter of the crankshaft at the assembly position with the assembly cavity. The connecting assembly is used to lock the relative position of the second clamp and the upper support after the small-diameter section is accommodated in the assembly cavity.

[0033] In this configuration, the compressor upper support aligning device realizes high-precision fitting with the bearing through the large-diameter section of the first clamp, and then realizes high-precision positioning of the first clamp to calibrate the position of the crankshaft through the small-diameter section. The second clamp realizes high-precision fitting with the small-diameter section through the assembly cavity, so that the assembly cavity is used to calibrate the installation position space of the end of the crankshaft relative to the bearing. After the position of the assembly cavity is determined, the second clamp is locked through the connecting assembly, so that the position of the assembly cavity is fixed. Then the first clamp is removed, the assembly cavity is empty, and the end of the crankshaft can be installed into the assembly cavity during the installation of the crankshaft into the bearing, so as to ensure the high installation precision of the crankshaft relative to the bearing. Therefore, through the cooperative fitting of the first clamp and the second clamp, the aligning of the crankshaft relative to the upper support during the assembly process can be assisted, and the assembly precision of the crankshaft and the upper support is improved.

[0034] The compressor upper support aligning device is a upper-lower split structure composed of the first clamp and the second clamp, so that the adjusting device does not occupy the assembly hole of the upper support during the aligning process (the first clamp is removed during the aligning process). It is suitable for the assembly of the upper support with an equal-diameter assembly hole, so that the high assembly precision of the upper support with an equal-diameter assembly hole and the crankshaft is possible, which is beneficial to reduce the processing difficulty and cost of the upper support, and also expands the processing means (punching and machining) of the upper support. The aligning device has simple structure and is convenient to use, which is helpful to simplify the assembly process of the upper support and the crankshaft. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The figure is a schematic view of the upper support structure of the compressor of an embodiment of the present application.

[0036] Figure 2 Structure schematic diagram of the upper support alignment device and the upper support assembly of an embodiment of the present application;

[0037] Figure 3 Structure schematic diagram of the upper support alignment device and the upper support assembly of an embodiment of the present application; Figure 2 Structure schematic diagram of the upper support alignment device and the upper support assembly of an embodiment of the present application;

[0038] Figure 4 Structure schematic diagram of the upper support alignment device and the upper support assembly of an embodiment of the present application;

[0039] Figure 5 Structure schematic diagram of the first clamp of an embodiment of the present application;

[0040] Figure 6 Structure schematic diagram of the first clamp of an embodiment of the present application;

[0041] Figure 7 Structure schematic diagram of the second clamp of an embodiment of the present application.

[0042] In the drawings:

[0043] 100 - upper support; 101 - assembly hole; 102 - threaded hole;

[0044] 200 - bearing;

[0045] 10 - first clamp; 11 - clamp shaft; 111 - large diameter section; 112 - small diameter section; 113 - guide portion; 12 - seat body; 13 - first groove;

[0046] 20 - second clamp; 201 - assembly cavity; 202 - connecting hole; 21 - shaft sleeve; 22 - assembly portion; 23 - second groove; 24 - air hole;

[0047] 30 - connecting assembly;

[0048] a - first assembly surface;

[0049] b - lower assembly surface;

[0050] c - second assembly surface;

[0051] d - upper assembly surface. DETAILED DESCRIPTION

[0052] The compressor upper support alignment device of the present application will be further described in detail below in combination with the drawings and specific embodiments. The advantages and features of the present application will be more apparent according to the following description. It should be noted that the drawings are all in a very simplified form and all use non-precise proportions, only for the purpose of facilitating and clearly assisting the description of the embodiments of the present application.

[0053] As used in the present application, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. The term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise. The term "plurality" is generally employed in its sense including "two or more" unless the context clearly dictates otherwise. The terms "first," "second," "third," etc. are used only to describe a particular one of the features and do not imply relative importance or a limitation on the number of features that can comprise a claimed feature. Thus, features defined with "first," "second," "third," etc. can include one or at least two of that feature. In addition, as used in the present application, "mounting," "connected," "connection," an element "disposed" on another element, should be broadly interpreted, and generally only means that there is a connection, coupling, cooperation or transmission relationship between two elements, and the two elements can be directly or indirectly connected, coupled, cooperated or transmitted through intermediate elements, and cannot be understood as indicating or implying the spatial positional relationship between the two elements, i.e. one element can be in any position inside, outside, above, below or one side of the other element, unless the context clearly indicates otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used with respect to the exemplary embodiments as they are shown in the drawings, upward or upward direction is toward the top of the corresponding drawing, and downward or downward direction is toward the bottom of the corresponding drawing.

[0054] In combination Figure 1 As shown in the drawings, the alignment device in the present embodiment is applied to the upper support 100, which has an equal-diameter assembly hole 101 in the middle part for mounting the crankshaft. The upper support 100 supports the crankshaft to reduce the deflection of the upper part of the crankshaft, thereby improving the overall stability of the compressor.

[0055] The skirt of the upper support 100 is in contact with the inner circumferential surface of the compressor housing and is welded and fixed. The skirt and the assembly hole 101 need to have high coaxiality to ensure the feasibility of the installation of the upper support 100 and the reliability of the support of the crankshaft.

[0056] A bearing 200 (see detailed description below) is usually installed between the crankshaft and the assembly hole 101. The bearing 200 is usually a self-lubricating bearing. During assembly, the bearing 200 is first installed in the assembly hole 101, and then the crankshaft is installed in the bearing 200. The crankshaft and the inner ring of the bearing 200 are in clearance fit. When the crankshaft rotates, the bearing 200 is relied on to reduce the deflection of the tail part of the crankshaft, thereby improving the overall stability of the compressor. Therefore, the coaxiality between the crankshaft and the bearing 200 is required to be high, i.e. the single-sided gap between the crankshaft and the inner ring of the bearing 200 should be kept within a threshold range. Figure 3 As shown in the drawings, the alignment device in the present embodiment is applied to the upper support 100, which has an equal-diameter assembly hole 101 in the middle part for mounting the crankshaft. The upper support 100 supports the crankshaft to reduce the deflection of the upper part of the crankshaft, thereby improving the overall stability of the compressor.

[0057] To match the assembly of the upper support 100 and the crankshaft, the embodiment provides an upper support alignment device for the compressor.

[0058] In combination Figures 2 to 7 As shown in the figure, the upper support alignment device for the compressor comprises a first clamp 10, a second clamp 20 and a connecting assembly 30.

[0059] The first clamp 10 comprises a clamp shaft 11, which is divided into a large-diameter section 111 and a small-diameter section 112 coaxially along its axial direction; the outer diameter of the large-diameter section 111 is larger than that of the small-diameter section 112, so the clamp shaft 11 as a whole has a stepped shaft structure.

[0060] The large-diameter section 111 is used to match the bearing 200 in the assembly hole 101 of the upper support 100. The large-diameter section 111 and the bearing 200 form a high assembly precision, and since the large-diameter section 111 and the small-diameter section 112 are coaxially arranged, the small-diameter section 112 also forms a high assembly precision with the bearing 200, and the small-diameter section 112 is used to calibrate the position of the crankshaft.

[0061] The second clamp 20 has an assembly cavity 201, which is used to accommodate the small-diameter section 112. The assembly cavity 201 and the small-diameter section 112 form a high assembly precision, and since the small-diameter section 112 is used to calibrate the position of the crankshaft relative to the bearing 200, when the assembly cavity 201 matches the small-diameter section 112, the position of the assembly cavity 201 is determined, and at this time the assembly cavity 201 is used to calibrate the installation position space of the end of the crankshaft relative to the bearing 200.

[0062] The connecting assembly 30 is used to lock the relative position of the second clamp 20 and the upper support 100 after the small-diameter section 112 is accommodated in the assembly cavity 201, so that the position of the assembly cavity 201 is fixed. When the crankshaft is installed, the first clamp 10 is removed, so that the assembly cavity 201 is empty, and then the crankshaft is installed in the bearing 200, and the end of the crankshaft is installed into the assembly cavity 201, which can ensure the high installation precision of the crankshaft relative to the bearing 200.

[0063] To ensure that the assembly precision of the alignment device meets the requirements, the relative sizes of the components also need to be limited.

[0064] Specifically, the outer diameter of the large-diameter section 111 is larger than that of the small-diameter section 112, and the outer diameter of the large-diameter section 111 is larger than the outer diameter of the assembly of the crankshaft and the bearing 200 and is less than or equal to the inner diameter of the bearing 200.

[0065] The above limitation on the size of the large-diameter section 111 makes the outer diameter of the large-diameter section 111 as close as possible to or equal to the inner diameter of the bearing 200.

[0066] For example, when the outer diameter of the large diameter section 111 is equal to the inner diameter of the bearing 200 in an ideal state, the large diameter section 111 and the bearing 200 form an ideal coaxial fit when the large diameter section 111 is assembled into the bearing 200. Since the large diameter section 111 and the small diameter section 112 are coaxial, the small diameter section 112 is also in an ideal coaxial fit with the bearing 200, and the small diameter section 112 can accurately mark the ideal position of the crankshaft relative to the bearing 200.

[0067] Similarly, when the outer diameter of the large diameter section 111 is not equal to the inner diameter of the bearing 200, the closer the outer diameter of the large diameter section 111 is to the inner diameter of the bearing 200, the higher the coaxial fit precision between the large diameter section 111 and the bearing 200 after the large diameter section 111 is assembled into the bearing 200, and the higher the position marking precision of the small diameter section 112.

[0068] The difference between the outer diameter of the large diameter section 111 and the outer diameter of the small diameter section 112 is on the order of um, and the difference is at least greater than 30 um, and preferably greater than 50 um. In this way, when the outer diameter of the small diameter section 112 is unchanged, the larger the outer diameter of the large diameter section 111, the smaller the assembly gap between the large diameter section 111 and the bearing 200, and the higher the coaxial precision between the crankshaft and the upper support can be ensured.

[0069] Similarly, the difference between the outer diameter of the large diameter section 111 and the outer diameter of the crankshaft at the assembly position of the bearing 200 is also on the order of um, and the difference is at least greater than 30 um, and preferably greater than 50 um. The difference between the inner diameter of the bearing 200 and the outer diameter of the large diameter section 111 is on the order of um, and the difference is at least less than 50 um, and preferably less than 30 um.

[0070] The assembly gap between the large diameter section 111 and the bearing 200 is a first gap (the difference between the maximum limit size of the inner diameter of the bearing 200 and the minimum limit size of the large diameter section 111), and the assembly gap between the crankshaft and the bearing 200 is a second gap (the difference between the maximum limit size of the inner diameter of the bearing 200 and the minimum limit size of the outer diameter of the crankshaft at the assembly position of the bearing 200). Based on the above size limits, the difference between the second gap and the first gap is preferably greater than or equal to 30 um (the first gap is smaller than the second gap).

[0071] For example, the assembly gap between the normal crankshaft and the bearing 200 is 130 um, at this time, because the assembly gap is relatively large, the crankshaft is easy to generate large eccentricity with the bearing 200, that is, the coaxial precision deviation between the crankshaft and the bearing 200 is large. At this time, by increasing the diameter of the large diameter section 111, the assembly gap between the large diameter section 111 and the bearing 200 is less than 50 um, even less than 40 um or 30 um, so that the assembly precision of the large diameter section 111 and the bearing 200 is greatly improved, and then the position calibration precision of the small diameter section 112 is also improved, that is, after the assembly of the crankshaft and the bearing 200, the circumferential assembly gap between them is uniform, so that the crankshaft can ensure high coaxial precision with the bearing 200.

[0072] The inner diameter of the assembly cavity 201 matches the outer diameter of the small diameter section 112 and the outer diameter of the crankshaft at the assembly position of the assembly cavity 201. The matching means that the nominal diameters of the components are equal, and the upper and lower deviations thereof can not be equal. For example, in the embodiment, the inner diameter of the assembly cavity 201 is equal to the outer diameter of the small diameter section 112 and the outer diameter of the crankshaft at the assembly position of the assembly cavity 201.

[0073] It should be noted that the equality here can mean that the ideal nominal diameters of the components are equal. For example, when the inner diameter of the assembly cavity 201 is absolutely equal to the inner diameter of the small diameter section 112 and the outer diameter of the crankshaft at the assembly position of the assembly cavity 201 (no error exists), the small diameter section 112 can calibrate the ideal position of the crankshaft, and the assembly cavity 201 can calibrate the ideal installation position space of the crankshaft end after being matched with the small diameter section 112, and the crankshaft end is installed in the assembly cavity 201, so that the ideal installation position is formed, and the absolute coaxial matching of the crankshaft and the bearing is formed.

[0074] In actual processing, there is a certain error in the diameters of the components. For example, in order to facilitate the assembly of the small diameter section 112 and the assembly cavity 201, the small diameter section 112 and the assembly cavity 201 are preferably gap matched. Then, in actual processing, the inner diameter of the assembly cavity 201 is slightly larger than the outer diameter of the small diameter section 112. At this time, it is determined that the assembly gap (the difference between the maximum limit size of the assembly cavity 201 and the minimum limit size of the small diameter section 112) of the small diameter section 112 and the assembly cavity 201 is less than 30 um, and also located in the above-mentioned matching range. Further, the assembly gap of the small diameter section 112 and the assembly cavity 201 is preferably less than 15 um.

[0075] Similarly, the position of the crankshaft at the assembly position of the assembly cavity 201 and the assembly gap (the difference between the maximum limit size of the assembly cavity 201 and the minimum limit size of the crankshaft at the position) of the assembly cavity 201 is less than 30 um, which also determines that the outer diameter of the position of the crankshaft at the assembly position of the assembly cavity 201 and the inner diameter of the assembly cavity 201 are located in the above-mentioned matching range. Further, the assembly gap of the position of the crankshaft at the assembly position of the assembly cavity 201 and the assembly cavity 201 is preferably less than 15 um.

[0076] In addition, the nominal diameter of the small-diameter section 112 of the crankshaft is preferably consistent with the nominal diameter and the upper and lower deviation value range of the small-diameter section 112.

[0077] The upper support adjusting device of the compressor described above is of a split structure composed of the first clamp and the second clamp, so that the adjusting device does not occupy the assembly hole of the upper support during the centering process (the first clamp is removed during the centering process) and is suitable for the assembly of the upper support with the equal-diameter assembly hole, so that the upper support with the equal-diameter assembly hole can maintain a high assembly precision with the crankshaft, which is beneficial to reducing the processing difficulty and cost of the upper support and also expands the processing methods (both stamping and machining) of the upper support. The centering device has a simple structure and is convenient to use, which is helpful to simplifying the assembly process of the upper support and the crankshaft.

[0078] The upper support centering device of the compressor described above realizes high-precision cooperation with the bearing 200 through the large-diameter section 111 of the first clamp 10, thereby realizing high-precision positioning of the first clamp 10 to calibrate the position of the crankshaft through the small-diameter section 112. The second clamp 20 cooperates with the small-diameter section 112 through the assembly cavity 201 to calibrate the installation position space of the end of the crankshaft relative to the bearing 200. After the position of the assembly cavity 201 is determined, the position of the assembly cavity 201 is fixed by locking the second clamp 20 through the connecting assembly 30, and then the first clamp 10 is removed, so that the assembly cavity 201 is empty, and the end of the crankshaft can be installed into the assembly cavity 201 during the installation of the crankshaft in the bearing 200, so as to ensure the high installation precision of the crankshaft relative to the bearing 200. Therefore, through the cooperation of the first clamp 10 and the second clamp 20, the centering of the crankshaft relative to the upper support during the assembly process is assisted, and the assembly precision of the crankshaft and the upper support is improved.

[0079] In the embodiment, the clamp shaft 11 is preferably of an integrated structure, which is beneficial to ensuring the high coaxial precision of the large-diameter section 111 and the small-diameter section 112.

[0080] In the embodiment, the single-side clearance theoretical minimum value of the crankshaft and the bearing 200 is kmin, and the maximum value is kmax after the assembly of the crankshaft and the upper support 100 is completed.

[0081] In combination with Figures 4 to 7 As shown in the figure, the nominal diameter of the large-diameter section 111 is D1, the maximum limit size of D1 is D1max, and the minimum limit size of D1 is D1min.

[0082] The nominal diameter of the crankshaft at the assembly position of the bearing is D2, the maximum limit size of the outer diameter of the crankshaft at the assembly position of the bearing is D2max, and the minimum limit size is D2min.

[0083] The D1min satisfies: D2max / 2≤D1min / 2≤kmin+D2max / 2;

[0084] Wherein, kmin is the theoretical minimum value of the single side gap of the crankshaft and the bearing 200.

[0085] The outer diameter of the small diameter section 112 is D3, the maximum limit size of D3 is D3max, and the minimum limit size of D3 is D3min; D3 and its upper and lower limit sizes are consistent with D2. In order to facilitate assembly and ensure high assembly accuracy, D3max<D1min needs to be met.

[0086] The inner diameter of the bearing 200 is D4, the maximum limit size of D4 is D4max, and the minimum limit size of D4 is D4min; in order to prevent the first clamp 10 from being unable to be assembled, D1max≤D4min needs to be set, and more preferably D1max=D4min.

[0087] The inner diameter of the assembly cavity 201 of the second clamp 20 is D5, which should be guaranteed to be D5≥D3.

[0088] Please refer to Figure 5 and Figure 6 As shown, the first clamp 10 further comprises a seat body 12, and the seat body 12 has a first assembly surface a for abutting with the upper support 100. One end of the large diameter section 111 (the lower end of the large diameter section 111 in Figure 5 and Figure 6 ) is connected with the first assembly surface a of the seat body 12, and the other end (the upper end of the large diameter section 111 in Figure 5 and Figure 6 ) is connected with the small diameter section 112, and the central axis of the clamp shaft 11 is perpendicular to the first assembly surface a, that is, the clamp shaft 11 and the first assembly surface a maintain high vertical accuracy.

[0089] In the embodiment, the clamp shaft 11 and the seat body 12 are integrally formed to ensure high relative position accuracy of the two.

[0090] The radial outer size of the seat body 12 in the radial direction of the clamp shaft 11 is greater than the inner diameter of the assembly hole 101 of the upper support 100. In the embodiment, the seat body 12 is disc-shaped, so its radial outer size is the outer diameter of the seat body 12. In other alternative embodiments, for the seat body 12 being a non-disc structure, the radial outer size corresponds to the diameter of the circumscribed circle. By limiting the radial outer size of the seat body 12, the seat body 12 will not pass through the assembly hole 101, thereby forming an axial positioning effect on the clamp shaft 11.

[0091] In combination with Figure 3 and Figure 4As shown, the lower end surface of the upper support 100 has a ring-shaped lower assembly surface b, and the central axis of the assembly hole 101 is perpendicular to the lower assembly surface b, that is, the assembly hole 101 and the lower assembly surface b maintain a high vertical precision. As shown Figure 3 As shown, when the large-diameter section 111 of the clamp shaft 11 is assembled with the assembly hole 101 of the upper support 100, the first assembly surface a of the first clamp 10 is conformally attached to the lower assembly surface b of the upper support 100, and at this time, the small-diameter section 112 of the clamp shaft 11 naturally extends upward out of the assembly hole 101. In addition, the cooperation of the assembly surface a and the lower assembly surface b can not only play a role in the axial positioning of the clamp shaft 11, but also can be used to correct the overall posture of the first clamp 10 to ensure the high assembly precision of the large-diameter section 111 and the assembly hole 101, and thus the small-diameter section 112 has high positional accuracy.

[0092] In addition, in combination with Figure 3 As shown, the free end of the small-diameter section 112 Figure 5 and Figure 6 the upper end of the small-diameter section 112 in FIG. 2) and the bottom of the assembly cavity 201 of the second clamp 20 can maintain a certain gap to prevent the second clamp 20 from interfering with the small-diameter section 112 in the axial direction.

[0093] Please continue to refer to Figure 5 and Figure 6 As shown, the end of the small-diameter section 112 away from the large-diameter section 111 along its axial direction Figure 5 and Figure 6 the upper end of the small-diameter section 112 in FIG. 2) is a guide portion 113; along the axial direction of the small-diameter section 112, from the side close to the large-diameter section 111 to the side away from the large-diameter section 111 Figure 5 and Figure 6 from top to bottom in FIG. 2), the outer diameter of the guide portion 113 gradually decreases.

[0094] In this embodiment, the guide portion 113 has a circular truncated cone structure, which has a tapered outer surface, that is, the outer diameter of the guide portion 113 changes linearly. The guide portion 113 of this structure has a guiding effect, which facilitates the insertion of the small-diameter section 112 into the assembly hole 101 and facilitates the assembly of the first clamp 10 and the assembly hole 101. In combination with Figure 3 and Figure 4 As shown, the lower end of the assembly hole 101 is provided with a chamfer structure, so that the lower end of the assembly hole 101 is an expanded hole structure to facilitate the guide of the clamp shaft 11, the crankshaft and the bearing 200, and improve the convenience when the first clamp 10, the crankshaft and the bearing 200 are pressed into the assembly hole 101.

[0095] In other alternative embodiments, the inner diameter of the guide portion 113 can also change nonlinearly, and at this time, the inner wall of the guide portion 113 can be a curved surface structure.

[0096] Please refer to Figure 6 As shown, a first groove 13 is formed on the first mounting surface a around the large-diameter section 111 on the seat 12. The first groove 13 is fitted to the outer peripheral surface of the large-diameter section 111. The first groove 13 can improve the stress concentration at the connection between the seat 12 and the clamp shaft 11, and prevent interference between the connection between the seat 12 and the clamp shaft 11 and the upper support 100. It also helps to reduce the area of ​​the first mounting surface a, thereby reducing the effective contact area between the first clamp 10 and the upper support 100 and improving their flatness fit. In addition, along the radial direction of the seat 12, the width of the first groove 13 is smaller than the width of the lower mounting surface b, to prevent the lower mounting surface b from getting stuck in the first groove 13 and causing the upper support 100 to become skewed, thus affecting the coaxial accuracy of the upper support 100.

[0097] Please refer to Figure 7 As shown, the second clamp 20 includes a bushing 21 and an assembly portion 22. The inner cavity of the bushing 21 serves as the assembly cavity 201. The assembly cavity 201 has an open end that extends through to a first end of the bushing 21 along its axial direction. Figure 7 The lower end of the central sleeve 21 is used for the insertion of the small diameter section 112.

[0098] The assembly part 22 is connected to the open end of the bushing 21 and extends radially along the bushing 21. The second clamp 20 has a second assembly surface c, which is used to fit against the upper support 100. The second assembly surface c is located at one end of the assembly part 22. Figure 7 (Lower end of the middle assembly part 22). The second assembly surface c is perpendicular to the central axis of the assembly cavity 201.

[0099] In this embodiment, the assembly part 22 is annular, therefore the second assembly surface c is also annular. In other alternative embodiments, the shape of the assembly part 22 can be adjusted according to actual usage requirements, for example, it can be set as a cuboid or polygonal structure.

[0100] Combination Figure 3 and Figure 4 As shown, the upper end face of the upper support 100 has an annular upper assembly surface d, and the second assembly surface c is attached to the upper assembly surface d of the upper support 100 to ensure that the second clamp 20 has a high assembly accuracy relative to the upper support 100. The flatness of the second assembly surface c and the upper assembly surface d should maintain a high accuracy.

[0101] A second groove 23 is formed on the second assembly surface c around the opening of the bushing 21; the second groove 23 communicates with the assembly cavity 201. The setting of the second groove 23 can reduce the area of ​​the second assembly surface c, thereby reducing the effective contact area between the upper support 100 and the second clamp 20 and improving the flatness fit.

[0102] In this embodiment, the second groove 23 is arranged as a circular groove, and the second groove 23 is coaxially arranged with the assembly cavity 201 and the assembly portion 22. In other alternative embodiments, the shape of the second groove 23 can be adjusted based on actual use requirements.

[0103] The shaft sleeve 21 is provided with an air hole 24 at the second end of the shaft sleeve 21 along the axial direction of the shaft sleeve 21. Figure 7 The air hole 24 is in communication with the assembly cavity 201. This arrangement can enable the small-diameter section 112 of the first clamp 10 or the end portion of the crankshaft to be assembled into the assembly cavity 201 through the air hole 24 during the assembly process, so that the assembly cavity 201 can be vented, thereby preventing excessive air pressure and difficulty in pressing in due to a too small gap and difficulty in venting during the pressing of the small-diameter section 112 into the assembly cavity 201 or the pressing of the crankshaft into the assembly cavity 201.

[0104] In this embodiment, the air hole 24 is provided with one air hole, and the air hole 24 is a circular hole structure. In other alternative embodiments, the air hole 24 can be provided with two, three or more air holes, and the air hole 24 can be provided as a square hole or other shapes. The number and shape of the air hole 24 can be adjusted based on actual use requirements.

[0105] In this embodiment, the air hole 24 is provided along the axial direction of the assembly cavity 201. In other alternative embodiments, the air hole 24 can be provided at an angle to the axial direction of the assembly cavity 201, for example, the air hole 24 can be provided along the radial direction of the assembly cavity 201, and at this time, the air hole 24 can be provided on the outer circumferential surface of the second end of the shaft sleeve 21, and the air hole 24 should be in communication with the bottom of the assembly cavity 201. Figure 7 In this embodiment, the air hole 24 is provided along the axial direction of the assembly cavity 201. In other alternative embodiments, the air hole 24 can be provided at an angle to the axial direction of the assembly cavity 201, for example, the air hole 24 can be provided along the radial direction of the assembly cavity 201, and at this time, the air hole 24 can be provided on the outer circumferential surface of the second end of the shaft sleeve 21, and the air hole 24 should be in communication with the bottom of the assembly cavity 201.

[0106] Please continue to refer to Figure 7 As shown in the figure, the assembly cavity 201 is provided with an expanding hole structure that gradually increases outwardly near the first end of the shaft sleeve 21. Figure 7 In this embodiment, the air hole 24 is provided along the axial direction of the assembly cavity 201. In other alternative embodiments, the air hole 24 can be provided at an angle to the axial direction of the assembly cavity 201, for example, the air hole 24 can be provided along the radial direction of the assembly cavity 201, and at this time, the air hole 24 can be provided on the outer circumferential surface of the second end of the shaft sleeve 21, and the air hole 24 should be in communication with the bottom of the assembly cavity 201.

[0107] In this embodiment, the opening side of the assembly cavity 201 is provided with a tapered expanding hole structure, that is, the inner diameter of the opening side changes linearly. In other alternative embodiments, the inner diameter of the opening side can change non-linearly, and at this time, the inner wall of the opening side of the assembly cavity 201 can be provided with a curved surface structure.

[0108] Please refer to Figure 7As shown, the second clamp 20 is provided with a plurality of connecting holes 202 on its second assembly surface c, the connecting assembly 30 connects the second clamp 20 and the upper support 100 through the connecting holes 202, the central axis of the connecting holes 202 is perpendicular to the second assembly surface c, so as to improve the assembly accuracy of the second clamp 20 and the upper support 100.

[0109] In the embodiment, the connecting holes 202 are circular hole structures, and the second clamp 20 is provided with three connecting holes 202 around its own central axis, and the three connecting assemblies 30 are used to fix the second clamp 20 and the upper support 100.

[0110] In other alternative embodiments, the number and shape of the connecting holes 202 can be adjusted adaptively based on the use requirements.

[0111] In the embodiment, the connecting assembly 30 is a bolt, and the bolt is screwed into the connecting hole 202 and the threaded hole 102 of the upper support 100. Figure 3 and Figure 4 As shown, the upper support 100 is provided with a plurality of threaded holes 102 matched with the connecting holes 202, and the bolt is screwed through the connecting hole 202 and the threaded hole 102.

[0112] Since the assembly accuracy of the connecting hole 202 and the threaded hole 102 and the bolt is low, after the second clamp 20 is positioned by the small-diameter section 112, the connecting hole 202 on the second clamp 20 can still be opposite to the threaded hole 102, which does not affect the connection of the second clamp 20 and the upper support 100 by the bolt.

[0113] In other alternative embodiments, the connecting assembly 30 can be a known clamping or other known connecting structure.

[0114] As shown in the drawings, Figure 7 The connecting hole 202 is provided with a stepped hole structure, the large-diameter hole of the connecting hole 202 is connected to the second assembly surface c, and the small-diameter hole of the connecting hole 202 is connected to the end of the assembly part 22 opposite to the second assembly surface c. The small-diameter hole is an internal threaded hole for threaded connection with the connecting assembly 30. Then, the connecting assembly 30 can be screwed with the small-diameter hole of the connecting hole 202, then pass through the large-diameter hole of the connecting hole 202, and then be screwed with the threaded hole 102 on the upper support 100, so as to realize the fastening of the upper support 100 and the second clamp 20.

[0115] In addition, based on the above-mentioned aligning device, an aligning method is provided in the embodiment, which includes the following steps:

[0116] S1: install the first clamp 10, make the large diameter section 111 of the clamp shaft 11 into the bearing 200 in the assembly hole 101 of the upper support 100, and make at least a part of the small diameter section 112 pass through the assembly hole 101 of the upper support 100; in particular, make the first assembly face a of the first clamp 10 adhere to the lower assembly face b of the upper support 100.

[0117] S2: install the second clamp 20, make the assembly cavity 201 of the second clamp 20 cooperate with the small diameter section 112; in particular, make the second assembly face c of the second clamp 20 adhere to the upper assembly face d of the upper support 100.

[0118] S3: lock the relative position of the second clamp 20 and the upper support 100 through the connecting assembly 30;

[0119] S4: remove the first clamp 10, make the crankshaft into the bearing 200, and make the end of the crankshaft cooperate with the assembly cavity 201;

[0120] S5: install the upper support 100 in the compressor shell, in particular, connect with the compressor shell through welding, at this time, due to the existence of the second clamp 20, the coaxial precision of the upper support 100 and the crankshaft can be ensured when the upper support 100 is installed in the compressor shell, and it is also helpful to prevent the thermal deformation of the upper support 100 from affecting the coaxial precision of the upper support 100 and the crankshaft when welding. After the installation of the upper support 100 is completed, remove the second clamp 20 and the connecting assembly 30, at this time, the installation of the crankshaft is completed.

[0121] The above-mentioned aligning device is beneficial to simplify the aligning process of the assembly process of the crankshaft and the upper support, and improve the assembly precision of the crankshaft and the upper support.

[0122] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between various embodiments can be referred to each other.

[0123] The above description is only a description of the preferred embodiments of the present application, and does not limit the scope of the present application. Any modification or modification made by a person skilled in the art according to the above disclosure is within the protection scope of the claims.

Claims

1. A compressor upper support alignment device, comprising: The application relates to a compressor upper support alignment device. The device comprises a first clamp, a second clamp and a connecting assembly. The first clamp comprises a clamp shaft, which is divided into a large-diameter section and a small-diameter section along the axial direction. The large-diameter section is used for matching with a bearing in the assembly hole of the upper support, the outer diameter of the large-diameter section is larger than that of the small-diameter section, the outer diameter of the large-diameter section is larger than that of the crankshaft at the assembly position of the crankshaft and the bearing and is smaller than or equal to the inner diameter of the bearing. The second clamp is provided with an assembly cavity, which is used for accommodating the small-diameter section, the inner diameter of the assembly cavity matches the inner diameter of the small-diameter section and the outer diameter of the crankshaft at the assembly position of the crankshaft and the assembly cavity. The connecting assembly is used for locking the relative position of the second clamp and the upper support after the small-diameter section is accommodated in the assembly cavity. The compressor upper support alignment device is aligned through the following steps: The first clamp is installed, the large-diameter section of the clamp shaft is assembled into the bearing in the assembly hole of the upper support, and at least a part of the small-diameter section passes through the assembly hole of the upper support. The second clamp is installed, so that the assembly cavity of the second clamp matches the small-diameter section. The relative position of the second clamp and the upper support is locked through the connecting assembly. The first clamp is removed, the crankshaft is assembled into the bearing, and the end of the crankshaft matches the assembly cavity. The upper support is installed on the compressor shell, and the second clamp is removed.

2. The compressor upper support alignment device of claim 1, wherein, The nominal diameter of the large-diameter section is D1, and the minimum limit size of the D1 is D1min. The D1min satisfies D2max / 2<=D1min / 2<=kmin+D2max / 2. The kmin is the theoretical minimum value of the single-side gap between the outer periphery of the crankshaft and the inner periphery of the bearing after the assembly of the crankshaft and the bearing is completed. The D2max is the maximum limit size of the outer diameter of the crankshaft at the assembly position of the crankshaft and the bearing.

3. The compressor upper support alignment device of claim 1, wherein, The assembly gap of the large-diameter section and the bearing is a first gap, the assembly gap of the crankshaft and the bearing is a second gap, and the difference between the second gap and the first gap is at least 30 um. And / or, the assembly gap of the small-diameter section and the assembly cavity is less than 30 um.

4. The compressor upper support alignment device of claim 1, wherein, The first clamp further comprises a seat body, and the seat body is provided with a first assembly surface. One end of the large-diameter section is connected with the first assembly surface of the seat body, and the other end is connected with the small-diameter section. The middle axis of the clamp shaft is perpendicular to the first assembly surface, and the radial outer size of the seat body along the radial direction of the clamp shaft is larger than the inner diameter of the assembly hole of the upper support.

5. The compressor upper support alignment device of claim 4, wherein, And / or, one end of the small-diameter section away from the large-diameter section is a guide part.

6. The compressor upper support alignment device of claim 1, wherein, A first groove is formed around the large-diameter section on the first assembly surface of the seat body.

7. The compressor upper support alignment device of claim 6, wherein, The second clamp is provided with a second assembly surface, which is used for abutting against the upper support. The second assembly surface is perpendicular to the middle axis of the assembly cavity. The second clamp is provided with a plurality of connecting holes penetrating through the second assembly surface, and the connecting assembly connects the second clamp and the upper support through the connecting holes. The middle axis of the connecting hole is perpendicular to the second assembly surface.

8. The compressor upper support alignment device of claim 6, wherein, The second clamp comprises a sleeve and an assembling part, an inner cavity of the sleeve serving as the assembling cavity; a first end of the sleeve serving as an open end, the assembling part being connected to the open end of the sleeve and extending along a radial direction of the sleeve, and the second assembling surface being located on the assembling part.

9. The compressor upper support alignment device of claim 8, wherein, A second groove is formed around the opening of the sleeve on the second assembling surface; and / or, a gas hole is formed on a second end of the sleeve along an axial direction of the sleeve, the gas hole being in communication with the assembling cavity; and / or, a side of the assembling cavity close to the first end of the sleeve is in a gradually enlarged counterbore structure.

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