Gap detection system and gap detection method

Abstract

The application provides a gap detection system and a gap detection method, and the gap detection system is used for detecting the gap between a rotor and a stator of a compressor and comprises: a holding device comprising a holding unit, the holding unit is used for holding the outside of a shell of the compressor and fixing the compressor; a rotating device comprising a connecting unit and a first driving unit connected with the connecting unit, after the connecting unit is connected with a crankshaft of the compressor, the first driving unit drives the connecting unit to rotate and drives the rotation of the crankshaft of the compressor; and a detection module connected with the rotating device, used for controlling the first driving unit and detecting the torque when the connecting unit rotates, and the torque is a gap measurement index. The detection method of the application obtains the torque when the rotor rotates through the gap detection system, judges whether the gap between the stator and the rotor of the compressor meets the design standard by taking the torque as the gap measurement index, so that the gap detection between the stator and the rotor is more objective and accurate.

Description

Technical Field

[0001] This invention relates to the field of compressors, and more specifically, to a gap detection system and a gap detection method. Background Technology

[0002] In variable frequency compressors, the permanent magnet motor mainly consists of a rotor and a stator. The rotor includes a rotor core and magnets mounted on the rotor core. Specifically, the rotor core has slots for placing the magnets. The rotor has strong magnetism. When the gap between the stator and rotor is different, the magnetic force exerted by the stator on the rotor varies, resulting in different torques required for rotor rotation. Current installation techniques typically rely on manual inspection, such as measuring the gap with a feeler gauge. However, the gap size is determined by the feeler gauge's measurement position and lacks a quantitative standard. This human error in the gap can lead to performance deviations in the compressor. Therefore, determining the appropriate gap between the stator and rotor to ensure the stability of the variable frequency compressor's performance is a pressing issue in this field.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] To address the problems in the prior art, the present invention aims to provide a gap detection system and a gap detection method. The detection method uses the gap detection system of the present invention to obtain a quantified torque of the compressor rotor, and then uses the torque as a gap measurement index to determine whether the gap between the compressor stator and rotor meets the design standards, thereby making the gap detection between the stator and rotor more objective and accurate.

[0005] A first aspect of the present invention provides a clearance detection system for detecting the clearance between the rotor and stator of a compressor, comprising:

[0006] A clamping device, including a clamping unit, the clamping unit being used to clamp the outer side of the compressor housing and fix the compressor;

[0007] A rotating device includes a connecting unit and a first driving unit connected to the connecting unit. After the connecting unit is connected to the crankshaft of the compressor, the first driving unit drives the connecting unit to rotate and drives the crankshaft of the compressor to rotate.

[0008] The detection module, connected to the rotating device, is used to control the first driving unit and detect the torque when the connecting unit rotates, wherein the torque is a gap measurement index.

[0009] According to the first aspect of the present application, the holding device further comprises a second driving unit connected with the holding unit, and the movement of the second driving unit can drive the holding unit to move.

[0010] According to the first aspect of the present application, the rotating device further comprises a third driving unit connected with the first driving unit, and the movement of the third driving unit can drive the first driving unit to move.

[0011] According to the first aspect of the present application, the holding unit comprises a fixing member, two holding arms connected with the fixing member, and a fourth driving unit, and the fourth driving unit drives the two holding arms to hold or release the shell of the compressor.

[0012] According to the first aspect of the present application, the connecting unit comprises a columnar body and a positioning member.

[0013] The outer diameter of the columnar body at the end towards the compressor is matched with the inner diameter of the shaft hole of the stator.

[0014] The positioning member is arranged at the end surface of the columnar body towards the compressor, and the end surface of the positioning member towards the compressor is higher than the end surface of the columnar body towards the compressor.

[0015] The positioning member can be inserted into the key groove of the crankshaft.

[0016] According to the first aspect of the present application, the positioning member is arranged at the end of the columnar body towards the compressor by means of an elastic member.

[0017] When the elastic member is in a compressed state, the end surface of the positioning member towards the compressor is not higher than the end surface of the columnar body towards the compressor.

[0018] When the elastic member is in an extended state, the end surface of the positioning member towards the compressor is higher than the end surface of the columnar body towards the compressor.

[0019] The second aspect of the present application provides a compressor gap detection method, which adopts the gap detection system and comprises the following steps:

[0020] S100: The compressor is placed on the detection platform of the gap detection system.

[0021] S200: The holding unit holds the shell of the compressor.

[0022] S300: The connecting unit is connected with the crankshaft of the compressor.

[0023] S400: the detection module drives the first driving unit and detects the torque when the connecting unit rotates, and the torque is the gap measurement index. According to the second aspect of the present application, the S400 step further comprises the following steps:

[0024] S500: judging whether the detected gap measurement index meets the set condition, if the gap measurement index meets the set condition, it is considered that the gap between the stator and the rotor of the compressor meets the design standard.

[0025] According to the second aspect of the present application, the set condition is that the detected gap measurement index is less than or equal to 0.25 N.m.

[0026] The present application obtains the torque when the rotor rotates through the gap detection system which fixes the compressor shell through the holding device and drives the rotor to rotate through the optional device. The detection method of the present application obtains the torque when the rotor rotates as the gap measurement index through the above detection system, judges whether the gap between the stator and the rotor of the compressor meets the design standard according to the obtained quantitative torque, so that the gap detection between the stator and the rotor is more objective and accurate. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application, other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when read in conjunction with the accompanying drawings. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0028] Figure 1 The structure diagram of the gap detection system of an embodiment of the present application;

[0029] Figure 2 The top view of the compressor detected by an embodiment of the present application;

[0030] Figure 3 And Figure 4 The schematic diagram of the connecting unit and the compressor connecting the crankshaft and the enlarged view of the connecting part of an embodiment of the present application;

[0031] Figure 5 The flow chart of the gap detection method of an embodiment of the present application;

[0032] Figure 6 The torque of the compressor with different gaps detected by an embodiment of the present application. DETAILED DESCRIPTION

[0033] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any of various forms, and are not limited to the specific implementations described herein; rather, specific implementations are provided as example to convey the substance of the disclosure. Features described with respect to one implementation can be incorporated into other implementations as well. The described features, structures, or characteristics can be combined in any suitable manner in one or more implementations.

[0034] Also, the accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate examples of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:

[0035] In the description of the specification, expressions of "one embodiment", "some embodiments", "example", "specific example", or "some examples", and the like mean that the specific feature, structure, material, or characteristic represented by the expression is included in at least one embodiment or example of the specification. In addition, the expression of the specific feature, structure, material, or characteristic can be combined in any suitable manner in any one or more embodiments or examples. Also, the representative embodiments or examples of the specification and the features of the representative embodiments or examples can be combined and combined by those skilled in the art without contradiction, if necessary.

[0036] In addition, the terms "first", "second", and the like are used only to distinguish the objects and are not to be construed as indicating or implying relative importance or a certain number of the indicated technical features. Thus, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the specification, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0037] Throughout this specification, when it is said that a device is "connected" to another device, it includes not only the case of "direct connection", but also the case of "indirect connection" in which other elements are placed therebetween. In addition, when it is said that a device "includes" a certain constituent element, unless otherwise specifically stated, other constituent elements are not excluded, but it means that other constituent elements can also be included.

[0038] Terms denoting relative positions such as "lower," "upper," and the like can be used herein for ease of describing the relationship of one device to another device as illustrated in the drawings. Such terms mean not only the orientation of the devices in the drawings, but also other orientations or operations of the devices in use. For example, if the devices in the drawings are turned upside down, a device that was described as being "lower" relative to another device would be "upper" relative to the other device. Thus, the exemplary term "lower" includes both upper and lower positions. The devices can be rotated 90° or other angles, and the terms denoting relative positions are to be interpreted accordingly.

[0039] While the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are described. Also, as used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and / or "including," when used herein, specify the presence of stated features, steps, operations, elements, units, items, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, units, items, components, and / or groups thereof. As used herein, the terms "or" and "and / or" are to be interpreted as inclusive, i.e., as meaning one or any combination of items. Thus, "A, B or C" or "A, B and / or C" means any of the following: A; B; C; A and B; A and C; B and C; A, B and C. An exception to this definition will occur only when a combination of elements, functions, steps or acts are in some way inherently mutually exclusive.

[0040] Although not all defined differently, technical and scientific terms used herein include those defined in a general dictionary, and all terms have the same meaning as generally understood by those skilled in the art to which the present specification belongs. Terms defined in a general dictionary are additionally interpreted to have a meaning consistent with the relevant technical literature and the content currently suggested, unless defined, and should not be over-interpreted as an ideal or very formal meaning.

[0041] To address the problems in existing technologies, this invention provides a gap detection system and method. The gap detection system is used to detect the gap between the rotor and stator of a compressor, comprising: a clamping device including a clamping unit for clamping the outer side of the compressor housing and fixing the compressor; a rotating device including a connecting unit and a first drive unit connected to the connecting unit, wherein the first drive unit, after being connected to the compressor crankshaft, can drive the compressor crankshaft to rotate; and a detection module connected to the rotating device for controlling the first drive unit and detecting the torque during the rotation of the connecting unit, wherein the torque is a gap measurement index. This invention uses the gap detection system to fix the compressor housing through the clamping device and simultaneously drives the rotor to rotate through the rotating device, thereby obtaining the torque during rotor rotation. The detection method of this invention obtains the torque during rotor rotation through the above detection system and uses the torque as a gap measurement index to determine whether the gap between the compressor stator and rotor meets design standards, thus making the gap detection between the stator and rotor more objective and accurate.

[0042] The gap detection system and gap detection method of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of the present invention.

[0043] Figure 1 This is a schematic diagram of a gap detection system according to an embodiment of the present invention, wherein the gap detection system includes:

[0044] A clamping device includes a clamping unit 11, which is used to clamp the outer side of the compressor housing and fix the compressor.

[0045] The rotating device includes a connecting unit 211 and a first driving unit 212 connected to the connecting unit 211. After the connecting unit 211 is connected to the crankshaft of the compressor, the first driving unit 212 drives the connecting unit to rotate and drives the crankshaft of the compressor to rotate.

[0046] Detection module (not in) Figure 1 As shown in the figure, it is connected to the rotating device and is used to control the first drive unit 212 and detect the torque when the connecting unit rotates, the torque being a clearance measurement index.

[0047] Figure 2Figure 1 is a top view of a compressor detected by an embodiment of the present application, wherein the compressor 8 comprises a housing 81, a motor 82, a rotor 83 and a stator 84 accommodated in the housing space, the stator 81 is provided with an axial hole through which a crankshaft 85 is arranged to pass and drive the rotor 83 to rotate. Generally, the upper end surface of the crankshaft 85 is provided with a key groove 851. When the crankshaft is installed with the rotor, the upper end surface thereof is lower than the upper surface of the rotor 83.

[0048] In some embodiments, the connecting unit 211 comprises a columnar body 2111 and a positioning member 2112;

[0049] The outer diameter of the columnar body 2111 towards the end of the compressor is adapted to the inner diameter of the axial hole of the stator 83, that is, the columnar body 2111 towards the end of the compressor can be inserted into the axial hole of the axial hole of the stator 83;

[0050] The positioning member 2112 is arranged on the end surface of the columnar body 2111 towards the compressor, and the end surface of the positioning member 2112 towards the compressor is higher than the end surface of the columnar body 2111 towards the compressor;

[0051] The positioning member 2112 can be inserted into the key groove 851 of the crankshaft 85. The schematic diagram of the connecting unit connected with the crankshaft of the compressor and the enlarged view of the connection are shown in Figure 3 and Figure 4 In this embodiment, the key groove 851 on the upper end surface of the crankshaft 85 is rectangular, and is triangular in the cross section perpendicular to the upper end surface of the crankshaft, as shown in Figure 4 Correspondingly, the positioning member 2112 of the present application is a triangular structure protruding from the end surface of the columnar body 2111 towards the compressor, and the thickness of the triangular structure is slightly smaller than the width of the key groove 851, wherein the width is the thickness of the key groove 851 in the direction perpendicular to the radius of the crankshaft. The width of the end surface of the columnar body 2111 towards the compressor is slightly smaller than the length of the key groove 851, wherein the length is the length of the key groove 851 in the direction of the radius of the crankshaft. The columnar body 2111 of the connecting unit 211 is inserted into the axial hole of the stator 83 until the positioning member 2112 is matched with the key groove 851 of the crankshaft 85. When the columnar body of the connecting unit 211 rotates, it drives the rotation of the crankshaft 85 through the key groove 851, and then drives the rotation of the rotor 83 connected with the crankshaft 85 through the rotation of the crankshaft 85. When the gap between the rotor 83 and the stator 84 is different, the magnetic force of the stator on the rotor is different, and correspondingly, the torque required by the rotor during rotation is also different. Different gaps correspond to different driving torques, and therefore, the gap between the rotor and the stator can be obtained by monitoring the driving torque of the rotor. The mapping relationship between the gap between the rotor and the stator and the driving torque can be obtained by experience.

[0052] In the connecting process described above, the positioning member 2112 needs to correspond to the position of the key groove 851 of the crankshaft 85. In actual use, the positioning member 2112 can be arranged at one end of the columnar body towards the compressor by means of an elastic member, such as a spring. When the elastic member is in a compressed state, the positioning member is accommodated in the groove, and the end surface of the positioning member towards the compressor is not higher than the end surface of the columnar body towards the compressor. When the elastic member is in an extended state, the positioning member moves towards the compressor, and the end surface of the positioning member towards the compressor is higher than the end surface of the columnar body towards the compressor. When the connecting unit with such a structure is connected with the crankshaft 85, the initial positioning of the positioning member 2112 with the position of the key groove 851 of the crankshaft 85 is not needed. It is only necessary to slowly rotate the columnar body 2111 of the connecting unit. When the positioning member 2112 is turned to the position of the key groove 851, the elastic member pushes out the positioning member 2112 to make the positioning member 2112 inserted into the key groove 851 of the crankshaft 85, thereby completing the connection of the connecting unit with the crankshaft.

[0053] The second aspect of the present application provides a compressor gap detection method using the gap detection system, Figure 5 The flow chart of the gap detection method of an embodiment of the present application specifically includes the following steps:

[0054] S100: The compressor 8 is placed on the detection platform 9 of the gap detection system.

[0055] S200: The holding unit holds the shell of the compressor.

[0056] S300: The connecting unit is connected with the crankshaft of the compressor.

[0057] S400: The detection module drives the first driving unit and detects the torque when the connecting unit rotates, and the torque is a gap measurement index. In some embodiments, the holding unit 11 can include a fixing member 111, two holding arms 112 connected with the fixing member 111, and a fourth driving unit. The two holding arms 112 can form a ring structure to embrace the outside of the shell of the compressor, and the fourth driving unit drives the two holding arms 112 to hold or release the shell of the compressor. The size of the ring structure formed by the holding arms can be adjusted according to the outer diameter of the shell of the compressor. The structure of the holding unit is not limited to the structure of the above-mentioned embodiment, and other structures that can hold or release the shell of the compressor are also available.

[0058] Before the holding unit holds the shell of the compressor in the step S200, the holding unit 11 can be moved to a position suitable for the shell of the compressor 8. In some embodiments, the holding device can further comprise a second driving unit 12 connected to the holding unit 11, and the movement of the second driving unit 12 can drive the movement of the holding unit 11. The movement can be up and down along the axis of the compressor, or in a plane perpendicular to the axis of the compressor, i.e. the holding unit 11 can move in three directions in space. The up and down movement of the second driving unit 12 can adjust the position of the holding unit 11 to hold the shell of the compressor.

[0059] Similarly, for the convenience of detection, the rotating device can further comprise a third driving unit 22 connected to the first driving unit 212, and the movement of the third driving unit 22 can drive the movement of the first driving unit 212. The movement can be up and down along the axis of the compressor, or in a plane perpendicular to the axis of the compressor, i.e. the first driving unit 212 (connecting unit 211) can move in three directions in space. Generally, the compressor can be fixed by the holding unit 11, and when the connecting unit 211 is concentrically arranged with the holding unit 11, only the up and down movement of the third driving unit 22 can drive the up and down movement of the connecting unit 211 to connect with the crankshaft.

[0060] After obtaining the torque of the connecting unit in rotation in the step S400, the gap detection method of the present application can further comprise the following steps:

[0061] S500: determining whether the detected gap measurement index meets the set condition. If the gap measurement index meets the set condition, it is considered that the gap between the stator and the rotor of the compressor meets the design standard.

[0062] Figure 6 For the torque of the compressor with different detected gaps in an embodiment of the present application, according to the empirical value, in some embodiments, the set condition can be the detected gap measurement index, i.e. the torque is less than or equal to 0.25 N.m. When the torque of the driving rotor of a compressor is measured as shown by the dashed line in FIG. 6, i.e. the peak value of the torque in a cycle is greater than 0.3 N.m, it is considered that the gap between the rotor and the stator corresponding to the torque does not meet the design standard. When the torque of the driving rotor of a compressor is measured as shown by the solid line in FIG. 6, i.e. the peak value of the torque in a cycle is less than 0.25 N.m, it is considered that the gap between the rotor and the stator corresponding to the torque meets the design standard. For compressors with different structures, due to structural differences, the set conditions, such as the critical threshold of the torque of the gap measurement index, can be different, and the set conditions can be set according to the actual situation. Figure 6 Figure 6 For the torque of the compressor with different detected gaps in an embodiment of the present application, according to the empirical value, in some embodiments, the set condition can be the detected gap measurement index, i.e. the torque is less than or equal to 0.25 N.m. When the torque of the driving rotor of a compressor is measured as shown by the dashed line in FIG. 6, i.e. the peak value of the torque in a cycle is greater than 0.3 N.m, it is considered that the gap between the rotor and the stator corresponding to the torque does not meet the design standard. When the torque of the driving rotor of a compressor is measured as shown by the solid line in FIG. 6, i.e. the peak value of the torque in a cycle is less than 0.25 N.m, it is considered that the gap between the rotor and the stator corresponding to the torque meets the design standard. For compressors with different structures, due to structural differences, the set conditions, such as the critical threshold of the torque of the gap measurement index, can be different, and the set conditions can be set according to the actual situation.​

[0063] After the step S500, the measured compressor can be removed, and the next compressor to be measured can be set on the platform of the gap detection system for the next gap detection, which will not be described herein. The detection method of the present application obtains the torque of the rotor during rotation as the gap measurement index through the detection system, and judges whether the gap between the stator and the rotor of the compressor meets the design standard according to the obtained quantitative torque, so that the gap detection between the stator and the rotor is more objective and accurate.

[0064] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A gap detection system for detecting a gap between a rotor and a stator of a compressor, the gap detection system comprising: The application relates to a gap detection system for a compressor. The system comprises a holding device, a rotating device, and a detection module. The holding device comprises a holding unit for holding and fixing the outer side of the compressor shell. The rotating device comprises a connecting unit and a first driving unit connected with the connecting unit. The connecting unit is connected with the crankshaft of the compressor. The first driving unit drives the connecting unit to rotate and drives the rotation of the compressor crankshaft. The detection module is connected with the rotating device. The detection module controls the first driving unit and detects the torque when the connecting unit rotates. The torque is a gap measurement index. The gap detection system is also used to determine whether the detected gap measurement index meets the set condition. If the gap measurement index meets the set condition, it is considered that the gap between the stator and the rotor of the compressor meets the design standard. The connecting unit comprises a columnar body and a positioning member.

2. The gap detection system of claim 1, wherein, The outer diameter of the end of the columnar body towards the compressor is matched with the inner diameter of the shaft hole of the stator.

3. The gap detection system of claim 1, wherein, The positioning member is arranged on the end surface of the columnar body towards the compressor.

4. The gap detection system of claim 1, wherein, The end surface of the positioning member towards the compressor is higher than the end surface of the columnar body towards the compressor.

5. A method of detecting a gap of a compressor using the gap detecting system according to claim 1, characterized by, The positioning member can be inserted into the key groove of the crankshaft. The positioning member is arranged on the end of the columnar body towards the compressor through an elastic member. When the elastic member is in a compressed state, the end surface of the positioning member towards the compressor is not higher than the end surface of the columnar body towards the compressor. When the elastic member is in an extended state, the end surface of the positioning member towards the compressor is higher than the end surface of the columnar body towards the compressor. The holding device further comprises a second driving unit connected with the holding unit. The movement of the second driving unit can drive the movement of the holding unit. The rotating device further comprises a third driving unit connected with the first driving unit.

6. The gap detection method according to claim 5, characterized by The movement of the third driving unit can drive the movement of the first driving unit. The holding unit comprises a fixing member, two holding arms connected with the fixing member, and a fourth driving unit. The fourth driving unit drives the two holding arms to hold or release the compressor shell. The application further comprises the following steps: S100: The compressor is placed on the detection platform of the gap detection system. S200: The holding unit holds the compressor shell. S300: The connecting unit is connected with the crankshaft of the compressor. S400: The detection module drives the first driving unit and detects the torque when the connecting unit rotates. The torque is a gap measurement index. The application further comprises the following steps: S500: Determine whether the detected gap measurement index meets the set condition. If the gap measurement index meets the set condition, it is considered that the gap between the stator and the rotor of the compressor meets the design standard. The set condition is that the detected gap measurement index is less than or equal to 0.25 N.m.

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