A stator suitable for shrink fitting and a compressor thereof
By setting a stepped structure at both ends and non-ends of the stator core, efficient thermal fitting between the compressor stator and the casing is achieved, solving the problems of increased iron loss and inconsistent coaxiality, and improving the operating performance and service life of the compressor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GREE ELECTRIC APPLIANCE INC OF ZHUHAI
- Filing Date
- 2025-09-09
- Publication Date
- 2026-08-04
AI Technical Summary
Existing compressors suffer from increased iron loss and inconsistency in coaxiality during the thermal assembly of the stator and casing. Improper operation may also cause stator tilting and scratches on the inner bore of the casing, affecting the compressor's service life.
A stepped structure is set at both the ends and non-ends of the stator core. It is assembled with the compressor housing through multi-stage stepped fit. The conical structure and wear-resistant coating are used to achieve initial alignment and automatic compensation, reduce iron loss and improve coaxiality.
It effectively reduces compressor iron loss, improves compressor efficiency, avoids scratches between the stator and the housing, and ensures coaxiality and service life.
Smart Images
Figure CN224596222U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of compressor technology, and in particular to a stator and compressor suitable for heat-insulated assembly. Background Technology
[0002] Assembly of existing compressors (see appendix) Figure 1 The stator core is heat-fitted to the compressor housing, resulting in an interference fit. During this interference fit, the stator core experiences radial compressive stress from the housing, increasing compressor iron losses. Furthermore, the interference fit can cause the stator to tilt within the housing due to inconsistent operator skill, affecting the coaxiality of the compressor and housing.
[0003] To address the issue of inconsistent relative positioning between the stator and housing during heat fitting, Chinese patent CN221652423U discloses a compressor winding stator heat fitting fixture for positioning. While this fixture solves the problems caused by manual operation, it cannot prevent increased compressor iron loss due to interference fit of the core, and it does not resolve the issue of inconsistent concentricity between the stator and housing. Furthermore, current fixture positioning primarily involves contact with the stator's inner bore. When there are warped laminations on the stator core end face or varnish nodules on the core side, the positional dimensions cannot be guaranteed, and the assembly process can cause scratches on the inner bore of the housing. The scraped housing debris falls to the bottom of the housing, causing wear on parts during compressor operation and ultimately affecting the compressor's lifespan. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a stator and compressor suitable for thermal assembly, so as to solve the technical problems of increased iron loss and inconsistent coaxiality in existing thermal assembly.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] In a first aspect, embodiments of the present invention provide a stator suitable for thermal assembly, comprising a stator core, a front stepped structure disposed at the lead-out end of the stator core, and a rear stepped structure disposed at the non-lead-out end of the stator core, wherein the front stepped structure and the rear stepped structure are symmetrically arranged with respect to the stacking height direction of the stator core.
[0007] The front stepped structure and the rear stepped structure have the same structure, both including: a positioning stage, a transition stage and a main interference stage with gradually decreasing diameter arranged sequentially from the end of the stator core towards the middle.
[0008] The diameters of the positioning stage, the transition stage, and the main interference stage are D1, D2, and D3, respectively; D1, D2, and D3 satisfy the following relationship: D2 = D1 - (0.1mm ~ 0.3mm), D3 = D2 - (0.05mm ~ 0.15mm).
[0009] The main interference stage is further provided with a sealing stage and a safety stage in sequence towards the center of the stator core.
[0010] Wherein, the diameters of the sealing grade and the safety grade are D4 and D5, respectively; D4 and D5 satisfy the following relationship: D4 = D3 - (0.03 ~ 0.1 mm), D5 = D4 - (0.02 mm ~ 0.05 mm).
[0011] The surface of the positioning stage is a conical structure with a radius of 1° to 5°.
[0012] The surface of the main interference stage is coated with a wear-resistant coating.
[0013] The difference in diameter between adjacent steps of the front stepped structure and the rear stepped structure is 0.01%-0.5% of the diameter of the stator core.
[0014] The adjacent steps of the front stepped structure and the rear stepped structure are connected by a smooth transition structure.
[0015] Secondly, this utility model embodiment also provides a compressor, including a compressor housing and a stator suitable for heat fitting as described above, which is heat-fitted into the compressor housing.
[0016] This utility model relates to a stator and compressor suitable for heat-fitting assembly. It features a stepped structure at the ends of the stator core, with multiple steps completing the heat-fitting assembly with the compressor housing. The stator core is fitted with the compressor housing with a gap, reducing compressor iron loss and improving compressor efficiency. During assembly, it effectively reduces coaxiality deviation between the stator and housing, minimizes excessive contact between the stator core and the inner hole of the housing, prevents surface damage, and automatically compensates for deformation of the housing caused by uneven heating during heat fitting.
[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the radial cross-sectional structure of an existing compressor housing and stator during assembly.
[0019] Figure 2 This is an axial cross-sectional view of the stator suitable for thermal assembly according to the first embodiment of this utility model.
[0020] Figure 3 for Figure 2 A magnified schematic diagram of part A in the middle.
[0021] Figure 4 for Figure 2 A magnified schematic diagram of part B in the middle section.
[0022] Figure 5 This is an axial cross-sectional view of the stator suitable for thermal assembly according to the second embodiment of this utility model.
[0023] Figure 6 for Figure 5 A magnified schematic diagram of a portion of the C-shaped structure.
[0024] Figure 7 for Figure 5 A magnified schematic diagram of a local D-section.
[0025] Figure 8 This is a schematic diagram of the thermal assembly process of the stator and compressor housing, which is applicable to thermal assembly according to an embodiment of the present invention.
[0026] Explanation of reference numerals in the attached figures:
[0027] Suitable for thermally fitted stators 100, 10, 20, 1, 1, 101, 102, 11, 12, 13, 13, L1, L2, L3, L4, L5, S1, S2, S3, S4, S5; suitable for thermally fitted stators 200, 2, 3, 4, 5, B1, B2, B3, B4, B5, H1, H2, H3, H4, H5, and 5, compressor housing. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0035] Assembly of existing compressors (see appendix) Figure 1 The stator 10 is heat-fitted to the compressor housing 20, resulting in an interference fit. During this interference fit, the stator 10 experiences compressive stress in its radial direction from the compressor housing 5, leading to increased compressor iron losses. Furthermore, the interference fit may cause the stator 10 to tilt within the compressor housing 20 due to inconsistent operator skill levels, thus affecting the coaxiality of the stator and housing.
[0036] To address the issue of unreliable relative position between the stator and housing during heat fitting, Chinese patent CN221652423U discloses a compressor winding stator heat fitting fixture for positioning. While this fixture solves the problems caused by manual operation, it cannot prevent increased compressor iron loss due to interference fit of the iron core, and it does not resolve the issue of inconsistent concentricity between the stator and housing. Furthermore, current fixture positioning is essentially in contact with the stator's inner hole. When there are warped laminations on the stator core end face or varnish nodules on the side of the core, the positional dimensions cannot be guaranteed, and the assembly process can cause scratches on the inner hole of the housing. The scraped housing debris falls to the bottom of the housing, causing wear on parts during compressor operation and ultimately affecting the compressor's service life. Therefore, based on the above requirements, this embodiment provides a stator 100 (200) and its compressor suitable for heat fitting.
[0037] Please see Figures 2 to 4 This is a schematic diagram of a first embodiment of a stator 100 suitable for heat fitting. In this first embodiment, the stator 100 suitable for heat fitting includes a stator core 1, a front stepped structure 11 disposed at the lead-out end 101 of the stator core 1, and a rear stepped structure 12 disposed at the non-lead-out end 102 of the stator core 1. The front stepped structure 11 and the rear stepped structure 12 are symmetrically arranged with respect to the stacking height direction of the stator core 1. That is, as shown... Figure 2As shown, viewed from the axial cross-sectional perspective of the stator 100 suitable for heat fitting, the front stepped structure 11 and the rear stepped structure 12 are symmetrical about the central vertical direction. Specifically, the front stepped structure 11 and the rear stepped structure 12 have the same structure, and are symmetrical about the central vertical direction. Figure 2 The stator core 1 is arranged symmetrically in the vertical direction. The main body of the stator core 1 has a columnar structure, and the front stepped structure 11 and the rear stepped structure 12 are respectively arranged on the side wall of the columnar structure and near the end position.
[0038] In this first embodiment, the stator core 1 has a front stepped structure 11 at the lead-out end 101 and a rear stepped structure 12 at the non-lead-out end 102. These structures are assembled with the compressor housing 5. During assembly, the largest diameter portions of the front stepped structure 11 and rear stepped structure 12 first contact the compressor housing 5, achieving initial alignment and improving coaxiality between them. As the compressor housing gradually cools and shrinks, the stepped structure in the middle is press-fitted into the compressor housing 5, achieving automatic compensation. After the compressor housing 5 cools, shrinks, and sets, a gap 13 is formed between the front stepped structure 11 and the rear stepped structure 12, and between the middle outer wall of the compressor housing 5 and the stator core 1, effectively reducing iron loss in the compressor. Furthermore, since the diameters of the front stepped structure 11 and the rear stepped structure 12 are both larger than the middle diameter of the stator core 1, the contact between the side wall of the stator core 1 and the inner wall of the compressor housing 5 can be effectively reduced during assembly, thus avoiding scratches on the varnish impregnation of the stator core 1.
[0039] For details, please refer to the following document again. Figure 3 and Figure 4 The front stepped structure 11 and the rear stepped structure 12 have the same structure, wherein the front stepped structure 11 includes: extending from the end of the stator core 11 towards the middle (i.e., as shown in the figure). Figure 3 The positioning stage L1, transition stage L2, and main interference stage L3 are arranged sequentially from left to right, with their diameters gradually decreasing. Figure 3 As shown in the cross-sectional view, the cross-sectional line of the front stepped structure 11 extends from the end of the stator core 1 towards the middle, with the steps gradually decreasing in size. From a three-dimensional perspective, the front stepped structure 11 is an annular tube structure with a gradually decreasing diameter and sequentially connected edges.
[0040] The diameters of the positioning stage L1, the transition stage L2, and the main interference stage L3 are D1, D2, and D3, respectively. D1, D2, and D3 satisfy the following relationship: D2 = D1 - (0.1mm ~ 0.3mm), D3 = D2 - (0.05mm ~ 0.15mm). Wherein, diameter D1 is the maximum diameter of the positioning stage L1.
[0041] In another embodiment, in order to improve the assembly quality, the main interference stage L3 is further provided with a sealing stage L4 and a safety stage L5 in sequence towards the center of the stator core 1.
[0042] Wherein, the diameters of the sealing grade L4 and the safety grade L5 are D4 and D5, respectively; D4 and D5 satisfy the following relationship: D4 = D3 - (0.03 ~ 0.1 mm), D5 = D4 - (0.02 mm ~ 0.05 mm).
[0043] like Figure 3 As shown, the surface of the positioning stage L1 is a conical structure with a 1° to 5° angle. Specifically, the surface of the positioning stage L1 has a conical structure with a smaller diameter at the front end and a larger diameter at the rear end, that is, the frontmost end of the positioning stage L1 is a conical structure. This conical structure facilitates quick alignment and centering when assembling with the compressor housing 5, and it has an assembly guiding function. The conical design in the positioning stage L1 guides the compressor housing 5 to initial alignment by means of sliding inclined surface contact, automatically correcting the initial deviation. As the temperature of the compressor housing 5 decreases, the inner diameter of the compressor housing 5 gradually decreases, forming contact with the transition stage L2. When the assembly progresses to the main interference fit stage L3, the stator core 1 and the inner hole of the housing achieve a full interference fit, and the contact pressure is axially symmetrically distributed. The special coating on the surface of the main interference fit stage L3 ensures wear resistance and a stable coefficient of friction, thereby completing the thermal fitting between the stator core 1 and the compressor housing 5.
[0044] The surface of the main interference fit stage L3 is coated with a wear-resistant coating. As the core interference fit surface between the stator core 1 and the inner hole of the compressor housing 5, the main interference fit stage L3 should be coated with a special coating (such as WC-Co). During compressor operation, the stator and housing may experience slight relative motion due to machine vibration. The special coating can optimize the coefficient of friction, enhance wear resistance, reduce wear rate, avoid fretting wear, and ensure assembly stability.
[0045] Furthermore, the diameter difference between adjacent steps of the front stepped structure 11 and the rear stepped structure 12 is 0.01%-0.5% of the diameter of the stator core 1. Setting the diameter difference between adjacent steps to the aforementioned percentage of the stator core 1's diameter is to avoid damage to the housing caused by sudden stress changes.
[0046] To reduce the probability of each step rubbing against the inner wall of the compressor housing 5 during assembly, the joints between adjacent steps of the front stepped structure 11 and the rear stepped structure 12 are designed with a smooth transition. That is, the joints between adjacent steps are designed with an arc-shaped surface, which improves the smoothness of assembly and reduces the chance of scratching the compressor housing 5 during assembly.
[0047] Please refer to it again. Figure 4Since the rear stepped structure 12 has the same structure as the front stepped structure 11 and is symmetrically arranged, the rear stepped structure 12 is provided with a positioning stage S1, a transition stage S2, and a main interference stage S3 sequentially from the end of the stator core 1 towards the middle. In another embodiment, to improve assembly quality, the main interference stage S3 is further provided with a sealing stage S4 and a safety stage S5 towards the middle of the stator core 1. The diameters and specific structures of the positioning stage S1, transition stage S2, main interference stage S3, sealing stage S4, and safety stage S5 are the same as those of the front stepped structure 11; please refer to the description of the front stepped structure 11 above for details.
[0048] It should be noted that, in this first embodiment, the front stepped structure 11 and the rear stepped structure 12 are integral with the stator core 1, that is, the front stepped structure 11 and the rear stepped structure 12 are integrally formed on the outer wall of the stator core 1 near both ends. The front stepped structure 11 and the rear stepped structure 12 are mostly formed on the side wall of the stator core 1 by high-speed stamping dies.
[0049] Please refer to it again. Figures 5 to 7 This is a schematic diagram of a second embodiment of a stator 200 suitable for heat-fitting. In this second embodiment, it includes a stator core 2, a front pressure plate 3 connected to the front end of the stator core 2, and a rear pressure plate 4 connected to the rear end of the stator core 2. The side wall of the front pressure plate 3 has a front stepped structure 31, and the side wall of the rear pressure plate 4 has a rear stepped structure 41. The front stepped structure 31 and the rear stepped structure 41 are symmetrically arranged with respect to the stacking height direction of the stator core 2. That is, as shown... Figure 6 As shown, viewed from the axial cross-sectional perspective of the stator 200 suitable for heat fitting, the front stepped structure 31 and the rear stepped structure 41 are symmetrical about the central vertical direction. Specifically, the front stepped structure 31 and the rear stepped structure 41 have the same structure, and are symmetrical about the central vertical direction. Figure 6 The vertical direction is symmetrically arranged as shown.
[0050] In this second embodiment, a front pressure plate 3 and a rear pressure plate 4 are respectively provided at the front and rear ends of the stator core 2. The front pressure plate 3 has a front stepped structure 31, and the rear pressure plate 4 has a rear stepped structure 12. The front stepped structure 31 and the rear stepped structure 41 are used to assemble with the compressor housing 5. During the assembly process, the largest diameter part of the front stepped structure 31 and the rear stepped structure 41 contacts the compressor housing 5 first, so that the compressor housing 5 and the stator core 2 are initially aligned and positioned, improving the coaxiality between them. When the compressor housing gradually cools and shrinks, the stepped structure in the middle is interference-fitted with the compressor housing 5 to achieve automatic compensation. After the compressor housing 5 cools, shrinks, and sets, a gap 13 is formed between the front stepped structure 31 and the rear stepped structure 41, and between the middle outer wall of the compressor housing 5 and the stator core 2, which can effectively reduce the iron loss of the compressor. Furthermore, since the diameters of the front stepped structure 31 and the rear stepped structure 41 are both larger than the middle diameter of the stator core 2, the contact between the side wall of the stator core 2 and the inner wall of the compressor housing 5 can be effectively reduced during assembly, thus avoiding scratches on the varnish impregnation of the stator core 2.
[0051] For details, please refer to the following document again. Figure 6 and Figure 7 The front stepped structure 31 and the rear stepped structure 41 have the same structure. The front stepped structure 31 includes: extending from the end of the stator core 21 towards the middle (i.e., as shown in the figure). Figure 6 The positioning stage B1, transition stage B2, and main interference stage B3 are arranged sequentially from left to right, with their diameters gradually decreasing. Figure 6 As shown in the cross-sectional view, the cross-sectional line of the front stepped structure 31 extends from the end of the stator core 2 towards the middle, with the steps gradually decreasing in size. From a three-dimensional perspective, the front stepped structure 31 is a ring-shaped stepped structure with a gradually decreasing diameter.
[0052] The diameters of the positioning stage B1, the transition stage B2, and the main interference stage B3 are D1, D2, and D3, respectively. D1, D2, and D3 satisfy the following relationships: D2 = D1 - (0.1mm ~ 0.3mm), D3 = D2 - (0.05mm ~ 0.15mm). Wherein, diameter D1 is the maximum diameter of the positioning stage B1.
[0053] In another embodiment, in order to improve the assembly quality, the main interference stage B3 is further provided with a sealing stage B4 and a safety stage B5 in sequence towards the center of the stator core 2.
[0054] Wherein, the diameters of the sealing grade B4 and the safety grade B5 are D4 and D5, respectively; D4 and D5 satisfy the following relationship: D4 = D3 - (0.03 ~ 0.1 mm), D5 = D4 - (0.02 mm ~ 0.05 mm).
[0055] like Figure 6 As shown, the surface of the positioning stage B1 is a conical structure with a 1° to 5° angle. Specifically, the surface of the positioning stage B1 has a conical structure with a larger diameter at the front end and a smaller diameter at the rear end, that is, the frontmost end of the positioning stage B1 is a conical structure. This conical structure facilitates quick alignment and centering when assembling with the compressor housing 5, and it has an assembly guiding function. The conical design in the positioning stage B1 guides the compressor housing 5 to initial alignment through sliding inclined surface contact, automatically correcting initial deviations. As the temperature of the compressor housing 5 decreases, the inner diameter of the compressor housing 5 gradually decreases, forming contact with the transition stage B2. When the assembly progresses to the main interference fit stage B3, the stator core 2 and the inner hole of the housing achieve a full interference fit, and the contact pressure is axially symmetrically distributed. The special coating on the surface of the main interference fit stage B3 ensures wear resistance and a stable coefficient of friction, thereby completing the thermal fitting between the stator core 2 and the compressor housing 5.
[0056] The surface of the main interference fit stage B3 is coated with a wear-resistant coating. As the core interference fit surface between the stator core 2 and the inner hole of the compressor housing 5, the main interference fit stage B3 should be coated with a special coating (such as WC-Co). During compressor operation, the stator and housing may experience slight relative movement due to machine vibration. The special coating can optimize the coefficient of friction, enhance wear resistance, reduce wear rate, avoid fretting wear, and ensure assembly stability.
[0057] Furthermore, the diameter difference between adjacent steps of the front stepped structure 31 and the rear stepped structure 41 is 0.01%-0.5% of the diameter of the stator core 2. Setting the diameter difference between adjacent steps to the aforementioned percentage of the stator core 2's diameter is to avoid sudden stress changes.
[0058] To reduce the friction between the various steps and the inner wall of the compressor housing 5 during assembly, the joints between adjacent steps of the front stepped structure 31 and the rear stepped structure 41 are designed with a smooth transition. That is, the joints between adjacent steps are designed with an arc-shaped surface, which improves the smoothness of assembly and reduces the likelihood of scratching the compressor housing 5 during assembly.
[0059] Please refer to it again. Figure 7Since the rear stepped structure 41 has the same structure as the front stepped structure 31 and is symmetrically arranged, the rear stepped structure 41 is provided with a positioning stage H1, a transition stage H2, and a main interference stage H3 sequentially from the end of the stator core 2 towards the middle. In another embodiment, to improve assembly quality, the main interference stage H3 is further provided with a sealing stage H4 and a safety stage H5 towards the middle of the stator core 2. The diameters and specific structures of the positioning stage H1, transition stage H2, main interference stage H3, sealing stage H4, and safety stage H5 are the same as those of the front stepped structure 31; please refer to the description of the front stepped structure 31 above for details.
[0060] It should be noted that, in this second embodiment, unlike the integrated structure of the front stepped structure 11 and the rear stepped structure 12 with the stator core 1 in the first embodiment, it is a combined structure of three components: stator core 2, front pressure plate 3 and rear pressure plate 4. The front stepped structure 31 and the rear stepped structure 41 are respectively disposed on the front pressure plate 3 and the rear pressure plate 4.
[0061] Please see Figure 8 This is a schematic diagram of the thermal assembly process of the stator 100 (200) and compressor housing 5, which is suitable for thermal assembly in this embodiment. The assembly process of the stepped structure 11 and compressor housing 5 is used as an example to illustrate the assembly process as follows:
[0062] When the compressor housing 5 is in a state of thermal expansion, it first contacts the positioning stage L1 in the stepped structure. The conical structure in the positioning stage L1 guides the compressor housing 5 to make initial alignment by means of sliding inclined contact, and automatically corrects the initial deviation. As the temperature drops, the inner diameter of the compressor housing 5 gradually decreases and forms contact with the transition stage L2. When the assembly is advanced to the main interference stage L3, the stator core and the inner hole of the compressor housing 5 achieve a full interference fit. The contact pressure is axially symmetrically distributed, and the special coating on the surface ensures wear resistance and a stable coefficient of friction, thereby completing the thermal fitting between the stator and the housing.
[0063] This embodiment provides a novel compressor structure that addresses many pain points in the industry. It effectively avoids problems arising from the compressor stator during heat fitting, reduces iron loss, improves compressor efficiency, and prevents the compressor stator from scratching the inner bore of the casing during heat fitting, while also effectively reducing the degree of misalignment between the stator and the casing. Specifically, by designing a multi-stage stepped structure with a diameter larger than the stator's outer diameter on the stator end face, an interference fit is achieved between the stepped structure and the casing, while the middle part of the stator has a clearance fit with the casing, effectively reducing iron loss and improving compressor efficiency. Furthermore, it automatically compensates for deformation of the casing caused by uneven heating during heat fitting. After thermal expansion, the large-diameter stepped shaft on the stator end face contacts the expanded casing first. The conical design allows for initial alignment between the stator and the casing. Subsequently, as the casing gradually contracts during the cooling phase, the small-diameter stepped shaft forms a gradient interference fit with the casing, thus achieving automatic compensation. Alternatively, as an alternative, an end-step stepped pressure plate can be added to the surface of the stator core; this method also achieves automatic compensation. The stepped fit allows for adaptive fine-tuning of alignment during the cooling process after thermal expansion, ensuring the concentricity of the stator and the inner bore of the housing, effectively reducing skewness. Furthermore, because the diameter of the stepped structure is larger than the stator core diameter, it effectively reduces excessive contact between the stator core and the housing, thus preventing the varnish residue on the stator core from scratching the inner bore of the housing.
[0064] This embodiment also discloses a compressor, which includes a compressor housing 5 and a stator 100 (200) of any of the above-described structures, heat-fitted into the compressor housing 5.
[0065] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.
Claims
1. A stator suitable for thermal assembly, characterized in that, It includes a stator core, a front stepped structure disposed at the lead-out end of the stator core, and a rear stepped structure disposed at the non-lead-out end of the stator core, wherein the front stepped structure and the rear stepped structure are symmetrically arranged in the stacking height direction of the stator core.
2. The stator suitable for thermal assembly according to claim 1, characterized in that, The front stepped structure and the rear stepped structure have the same structure, both including: a positioning stage, a transition stage and a main interference stage with gradually decreasing diameter arranged sequentially from the end of the stator core towards the middle.
3. The stator suitable for thermal assembly according to claim 2, characterized in that, The diameters of the positioning stage, the transition stage, and the main interference stage are D1, D2, and D3, respectively; D1, D2, and D3 satisfy the following relationship: D2 = D1 - (0.1mm ~ 0.3mm), D3 = D2 - (0.05mm ~ 0.15mm).
4. The stator suitable for thermal assembly according to claim 3, characterized in that, The main interference stage is further provided with a sealing stage and a safety stage in sequence towards the center of the stator core.
5. The stator suitable for thermal assembly according to claim 4, characterized in that, The diameters of the sealing grade and the safety grade are D4 and D5, respectively; D4 and D5 satisfy the following relationship: D4 = D3 - (0.03 ~ 0.1 mm), D5 = D4 - (0.02 mm ~ 0.05 mm).
6. The stator suitable for thermal assembly according to claim 2, characterized in that, The surface of the positioning stage has a conical structure of 1° to 5°.
7. A stator suitable for shrink fitting according to claim 2, characterised in that, The surface of the main interference stage is coated with a wear-resistant coating.
8. A stator suitable for shrink fitting according to any one of claims 1 to 5, characterised in that, The difference in diameter between adjacent steps of the front stepped structure and the rear stepped structure is 0.01%-0.5% of the diameter of the stator core.
9. A stator suitable for shrink fitting according to any one of claims 1 to 5, characterised in that, The transition between adjacent steps of the front stepped structure and the rear stepped structure is a smooth transition structure.
10. A compressor characterized by, Includes a compressor housing and a stator suitable for thermal fitting as described in any one of claims 1 to 9, thermally fitted within the compressor housing.