CN116242295A - Gap detection system and gap detection method - Google Patents

Abstract

The invention provides a gap detection system and a gap detection method, wherein the gap detection system is used for detecting the gap between a rotor and a stator of a compressor and comprises the following steps: the enclasping device comprises an enclasping unit, wherein the enclasping unit is used for enclasping the outer side of a shell of the compressor and fixing the compressor; the rotating device comprises a connecting unit and a first driving unit connected with the connecting unit, wherein 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 crankshaft of the compressor to rotate; and the detection module is connected with the rotating device and used for controlling the first driving unit and detecting the torque of the connecting unit when the connecting unit rotates, and the torque is a gap measurement index. According to the detection method, the torque is obtained through the gap detection system when the rotor rotates, and the torque is used as a gap measurement index to judge whether the gap between the stator and the rotor of the compressor meets the design standard, so that the gap between the stator and the rotor is detected more objectively and accurately.

Description

Gap detection system and gap detection method

Technical Field

The invention relates to the field of compressors, in particular to a gap detection system and a gap detection method.

Background

In the variable frequency compressor, the permanent magnet motor mainly comprises a rotor and a stator, wherein the rotor comprises a rotor core and magnetic steel arranged on the rotor core, and specifically, a magnetic steel groove for placing the magnetic steel is arranged on the rotor core. The rotor has stronger magnetism, and when the clearance between stator and the rotor is different, the magnetic force of stator to the rotor has the difference, and the torsion that the rotor rotation needs has the difference. In the conventional mounting technology, the size of the gap is usually checked by an operator, for example, the size of the gap is measured by a feeler gauge, and at this time, the size of the gap is determined by the measuring position of the feeler gauge, so that no quantization standard exists, and the gap with human error causes deviation of the performance of the compressor. How to obtain the gap between the stator and the rotor, so as to ensure the stability of the performance of the variable frequency compressor, is a problem to be solved in the field.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the invention and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a gap detection system and a gap detection method, wherein the gap detection system is used for obtaining the quantized torque of a rotor of a compressor, and then the torque is used as a gap measurement index to judge whether the gap between a stator and the rotor of the compressor meets the design standard, so that the gap detection between the stator and the rotor is more objective and accurate.

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

the enclasping device comprises an enclasping unit, wherein the enclasping unit is used for enclasping the outer side of a shell of the compressor and fixing the compressor;

the rotating device comprises a connecting unit and a first driving unit connected with the connecting unit, wherein 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 crankshaft of the compressor to rotate;

and the detection module is connected with the rotating device and used for controlling the first driving unit and detecting the torque of the connecting unit when the connecting unit rotates, and the torque is a gap measurement index.

According to the first aspect of the invention, the enclasping device further comprises a second driving unit connected with the enclasping unit, and the second driving unit can move to drive the enclasping unit to move.

According to the first aspect of the invention, 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.

According to a first aspect of the present invention, the hug unit includes a fixing member, two hug arms connected to the fixing member, and a fourth driving unit driving the housing of the compressor to be hugged or released by the one hug arm.

According to a first aspect of the present invention, the connection unit includes a columnar body and a positioning member;

the outer diameter of the columnar body facing one end of the compressor is matched with the inner diameter of the shaft hole of the stator;

the positioning piece is arranged on the end face, facing the compressor, of the columnar body, and the end face, facing the compressor, of the positioning piece is higher than the end face, facing the compressor, of the columnar body;

the positioning piece can be inserted into a key slot of the crankshaft.

According to a first aspect of the present invention, the positioning member is disposed at an end of the columnar body facing the compressor through an elastic member;

when the elastic piece is in a compression state, the end face of the positioning piece, which faces the compressor, is not higher than the end face of the columnar body, which faces the compressor;

when the elastic piece is in an extending state, the end face of the positioning piece, which faces the compressor, is higher than the end face of the columnar body, which faces the compressor.

A second aspect of the present invention provides a compressor clearance detection method, using the clearance detection system, comprising the steps of:

s100: the compressor is arranged on a detection platform of the gap detection system;

s200: the enclasping unit enclasps the shell of the compressor;

s300: the connecting unit is connected with a crankshaft of the compressor;

s400: the detection module drives the first driving unit and detects torque when the connecting unit rotates, and the torque is a gap measurement index. According to the second aspect of the present invention, the step S400 further includes the following steps:

s500: judging whether the detected clearance measurement index meets the set condition, if so, considering that the clearance between the stator and the rotor of the compressor meets the design standard.

According to a second aspect of the present invention, the setting condition is that the detected gap measurement index is equal to or less than 0.25n.m.

According to the invention, the compressor shell is fixed through the enclasping device through the gap detection system, and the rotor is driven to rotate through the optional device, so that the torque of the rotor during rotation is obtained. According to the detection method, the torque is used as a gap measurement index when the rotor rotates, and whether the gap between the stator and the rotor of the compressor meets the design standard is judged according to the obtained quantized torque, so that the gap between the stator and the rotor is detected more objectively and accurately.

Drawings

Other features, objects, and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments, which is incorporated in and forms a part of the specification, illustrating embodiments consistent with the present application, and together with the description serve to explain the principles of the present application, by referring to the following figures. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of a gap detection system according to an embodiment of the present invention;

FIG. 2 is a top view of a compressor according to an embodiment of the present invention;

FIGS. 3 and 4 are schematic views and enlarged views of the connection points of the connecting unit and the compressor crankshaft according to an embodiment of the present invention;

FIG. 5 is a flowchart of a gap detection method according to an embodiment of the present invention;

FIG. 6 is a graph illustrating detected compressor torque for different clearances in accordance with an embodiment of the present invention.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present specification. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples and the features of the different embodiments or examples presented in this specification may be combined and combined by those skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the expressions of the present specification, the meaning of "plurality" is two or more unless otherwise specifically defined.

Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" with other elements interposed therebetween. In addition, when a certain component is said to be "included" in a certain device, unless otherwise stated, other components are not excluded, but it means that other components may be included.

Terms representing relative spaces such as "lower", "upper", and the like may be used to more easily describe the relationship of one device to another device as illustrated in the figures. Such terms refer not only to the meanings indicated in the drawings, but also to other meanings or operations of the device in use. For example, if the device in the figures is turned over, elements described as "under" other elements would then be described as "over" the other elements. Thus, the exemplary term "lower" includes both upper and lower. The device may be rotated 90 deg. or at other angles and the terminology representing relative space is to be construed accordingly.

Although the terms first, second, etc. may be used herein to connote various elements in some instances, the elements should not be limited by the terms. These terms are only used to distinguish one element from another element. For example, a first interface, a second interface, etc. Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, steps, operations, elements, units, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, steps, operations, elements, units, items, categories, and/or groups. The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; 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 operations are in some way inherently mutually exclusive.

Although not differently defined, including technical and scientific terms used herein, all terms have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The term addition defined in the commonly used dictionary is interpreted as having a meaning conforming to the contents of the related art document and the current hint, so long as no definition is made, it is not interpreted as an ideal or very formulaic meaning too much.

In view of the problems in the prior art, the present invention provides a gap detection system and a gap detection method, the gap detection system is used for detecting a gap between a rotor and a stator of a compressor, and the gap detection system includes: the enclasping device comprises an enclasping unit, wherein the enclasping unit is used for enclasping the outer side of a shell of the compressor and fixing the compressor; the rotating device comprises a connecting unit and a first driving unit connected with the connecting unit, wherein after the connecting unit is connected with a crankshaft of the compressor, the rotation of the first driving unit can drive the rotation of the crankshaft of the compressor; and the detection module is connected with the rotating device and used for controlling the first driving unit and detecting the torque of the connecting unit when the connecting unit rotates, and the torque is a gap measurement index. According to the invention, the compressor shell is fixed through the enclasping device through the gap detection system, and the rotor is driven to rotate through the rotating device, so that the torque of the rotor during rotation is obtained. According to the detection method, the torque is obtained when the rotor rotates through the detection system, and the torque is used as a clearance measurement index to judge whether the clearance between the stator and the rotor of the compressor meets the design standard, so that the clearance between the stator and the rotor is detected more objectively and accurately.

The gap detection system and the gap detection method of the present invention will be further described with reference to the accompanying drawings and specific embodiments, and it is to be understood that the specific embodiments are not to be construed as limiting the scope of the invention.

Fig. 1 is a schematic structural diagram of a gap detection system according to an embodiment of the present invention, where the gap detection system includes:

the enclasping device comprises an enclasping unit 11, wherein the enclasping unit 11 is used for enclasping the outer side of a shell of the compressor and fixing the compressor;

the rotating device comprises a connecting unit 211 and a first driving unit 212 connected with the connecting unit 211, wherein after the connecting unit 211 is connected with a crankshaft of the compressor, the first driving unit 212 drives the connecting unit to rotate and drives the crankshaft of the compressor to rotate;

a detection module (not shown in fig. 1) is connected to the rotation device for controlling the first driving unit 212 and detecting a torque when the connection unit rotates, the torque being a gap measure.

Fig. 2 is a top view of a compressor according to an embodiment of the present invention, wherein the compressor 8 includes a housing 81, a motor 82 accommodated in a space of the housing, a rotor 83, and a stator 84, the stator 81 is provided with a shaft hole passing through a crankshaft 85, and the crankshaft 85 penetrates through the shaft hole of the rotor 83 and drives the rotor 83 to rotate. Typically, the upper end surface of the crankshaft 85 is provided with a key groove 851. When the crankshaft is mounted to the rotor, its upper end surface is lower than the upper surface of the rotor 83.

In some embodiments, the connection unit 211 includes a cylindrical body 2111 and a retainer 2112;

the outer diameter of the columnar body 2111 facing the end of the compressor is matched with the inner diameter of the shaft hole of the stator 83, namely, the columnar body 2111 facing the end of the compressor can be inserted into the shaft hole of the stator 83;

the positioning piece 2112 is arranged on the end face of the columnar body 2111 facing the compressor, and the end face of the positioning piece 2112 facing the compressor is higher than the end face of the columnar body 2111 facing the compressor;

the retainer 2112 is insertable into a keyway 851 in the crankshaft 85. In this embodiment, the key slot 851 is rectangular on the upper end surface of the crankshaft 85 and triangular on the section perpendicular to the upper end surface of the crankshaft, as shown in fig. 4, and correspondingly, the positioning member 2112 of the present invention is a triangular structure of the protrusion and the cylindrical body 2111 facing the end surface of the compressor, the thickness of the triangular structure is slightly smaller than the width of the key slot 851, and the width thereof is the thickness of the key slot 851 in the radial direction perpendicular to the crankshaft. The width of the triangular structure and the cylindrical body 2111 at the end face facing the compressor is slightly smaller than the length of the key groove 851, where the length is the length of the key groove 851 in the crankshaft radius direction. The cylindrical body 2111 of the connection unit 211 is inserted into the shaft hole of the stator 83 until the positioning member 2112 is engaged with the key slot 851 of the crankshaft 85, when the cylindrical body of the connection unit 211 rotates, it drives the crankshaft 85 to rotate through the key slot 851, and then drives the rotor 83 connected with the crankshaft 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 to the rotor is different, and accordingly, the torque required when the rotor rotates is also different. Different clearances correspond to different drive torques, and therefore, the clearance between the rotor and the stator can be obtained by monitoring the torque driving the rotor. The mapping relation between the clearance between the rotor and the stator and the driving torque can be obtained through empirical fingers.

In the above connection process, the positioning piece 2112 needs to correspond to the position of the key slot 851 of the crankshaft 85, and in actual use, the positioning piece 2112 may be disposed at one end of the columnar body facing the compressor through an elastic piece; if a groove is arranged at one end of the columnar body, which faces the compressor, the bottom of the groove is connected with a positioning piece through an elastic piece, such as a spring, and the like, when the elastic piece is in a compressed state, the positioning piece is accommodated in the groove, and the end face of the positioning piece, which faces the compressor, is not higher than the end face of the columnar body, which faces the compressor; when the elastic piece is in an extending state, the positioning piece moves towards the compressor, and the end face of the positioning piece, which faces the compressor, is higher than the end face of the columnar body, which faces the compressor. When the connecting unit with this structure is connected to the crankshaft 85, the original correspondence between the positioning member 2112 and the position of the key groove 851 of the crankshaft 85 is not required, and only the columnar body 2111 of the connecting unit is required to be slowly rotated, and when the positioning member 2112 is rotated to the position of the key groove 851, the elastic member ejects the positioning member 2112 to enable the positioning member 2112 to be inserted into the key groove 851 of the crankshaft 85, thereby completing the connection between the connecting unit and the crankshaft.

A second aspect of the present invention provides a method for detecting a gap of a compressor, with the gap detection system, and fig. 5 is a flowchart of a gap detection method according to an embodiment of the present invention, where the method specifically includes the following steps:

s100: the compressor 8 is arranged on a detection platform 9 of the gap detection system;

s200: the enclasping unit enclasps the shell of the compressor;

s300: the connecting unit is connected with a crankshaft of the compressor;

s400: the detection module drives the first driving unit and detects torque when the connecting unit rotates, and the torque is a gap measurement index. In some embodiments, the enclasping unit 11 may include a fixing member 111, two enclasping arms 112 connected with the fixing member 111, and a fourth driving unit, where the two enclasping arms 112 may form an annular structure and encircle the outer side of the shell of the compressor, and the fourth driving unit drives the continuous enclasping arms 112 to enclasp or loosen the shell of the compressor, and may adjust the size of the annular structure formed by the enclasping arms according to the outer diameter of the shell of the compressor. The structure of the enclasping unit is not limited to the structure of the above embodiment, and other structures that can enclasp or release the shell of the compressor may be used.

Before the enclasping unit in step S200 enclasps the shell of the compressor, the enclasping unit 11 may be moved to adapt its position to the position of the shell of the compressor 8, for convenience of detection, in some embodiments, the enclasping device may further include a second driving unit 12 connected to the enclasping unit 11, where the movement of the second driving unit 12 may drive the enclasping unit 11 to move, and the movement may be up and down along the axis direction of the compressor, or may be in a plane perpendicular to the axis of the compressor, that is, the enclasping unit 11 may move in three directions in space, and the up and down movement of the second driving unit 12 may adjust the enclasping unit 11 to place it in the position of the shell of the enclaspable compressor.

Likewise, for convenience of detection, the rotating device also includes a third driving unit 22 that may be connected to the first driving unit 212, where the movement of the third driving unit 22 may drive the first driving unit 212 to move. The movement may be up and down in the axial direction of the compressor or in a plane perpendicular to the axial direction of the compressor, i.e., the first driving unit 212 (the connection unit 211) may be moved in three directions in space. In general, the compressor can be fixed by the enclasping unit 11, and when the connecting unit 211 and the enclasping unit 11 are concentrically arranged, only the third driving unit 22 needs to be moved up and down to drive the connecting unit 211 to move up and down so as to be connected with the crankshaft.

The gap detection method of the present invention may further include the following steps after the step S400 of obtaining the torque when the connection unit rotates:

s500: judging whether the detected clearance measurement index meets the set condition, if so, considering that the clearance between the stator and the rotor of the compressor meets the design standard.

Fig. 6 shows the detected torque of the compressor with different clearances according to an embodiment of the present invention, and according to an empirical value, the setting condition may be a detected clearance measurement, that is, the torque is less than or equal to 0.25n×m (N.m). When the measured torque of the driving rotor of one compressor is shown as a dotted line in fig. 6, that is, the peak value of the torque is greater than 0.3n.m in one period, the gap between the rotor and the stator corresponding to the torque is not considered to meet the design criteria. When the measured torque of the driving rotor of one compressor is shown as a solid line in fig. 6, that is, the peak value of the torque is less than 0.25n.m in one period, the gap between the rotor and the stator corresponding to the torque is considered to meet the design criteria. For compressors with different structures, due to structural differences, setting conditions, such as critical threshold values of gap measurement index torque, can be different, and the setting conditions can be set according to actual situations.

After the step S500 is finished, the measured compressor may be removed, and the next compressor to be measured is set on the platform of the gap detection system to perform the next gap detection, which is not described herein. According to the detection method, the torque is used as a gap measurement index when the rotor rotates, and whether the gap between the stator and the rotor of the compressor meets the design standard is judged according to the obtained quantized torque, so that the gap between the stator and the rotor is detected more objectively and accurately.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (9)

1. A gap detection system for detecting a gap between a rotor and a stator of a compressor, comprising:

the enclasping device comprises an enclasping unit, wherein the enclasping unit is used for enclasping the outer side of a shell of the compressor and fixing the compressor;

the rotating device comprises a connecting unit and a first driving unit connected with the connecting unit, wherein 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 crankshaft of the compressor to rotate;

and the detection module is connected with the rotating device and used for controlling the first driving unit and detecting the torque of the connecting unit when the connecting unit rotates, and the torque is a gap measurement index.

2. The gap detection system of claim 1, wherein the hugging device further comprises a second drive unit coupled to the hugging unit, wherein movement of the second drive unit moves the hugging unit.

3. The gap detection system of claim 1, wherein the rotating device further comprises a third drive unit coupled to the first drive unit, movement of the third drive unit moving the first drive unit.

4. The gap detection system of claim 1, wherein the hugging unit comprises a fixing member, two hugging arms connected to the fixing member, and a fourth driving unit driving one of the hugging arms to hug or release a housing of the compressor.

5. The gap detection system of claim 1, wherein the connection unit comprises a cylindrical body and a positioning member;

the outer diameter of the columnar body facing one end of the compressor is matched with the inner diameter of the shaft hole of the stator;

the positioning piece is arranged on the end face, facing the compressor, of the columnar body, and the end face, facing the compressor, of the positioning piece is higher than the end face, facing the compressor, of the columnar body;

the positioning piece can be inserted into a key slot of the crankshaft.

6. The gap detection system according to claim 5, wherein the positioning member is provided at an end of the columnar body facing the compressor through an elastic member;

when the elastic piece is in a compression state, the end face of the positioning piece, which faces the compressor, is not higher than the end face of the columnar body, which faces the compressor;

when the elastic piece is in an extending state, the end face of the positioning piece, which faces the compressor, is higher than the end face of the columnar body, which faces the compressor.

7. A compressor clearance detection method employing the clearance detection system of claim 1, comprising the steps of:

s100: the compressor is arranged on a detection platform of the gap detection system;

s200: the enclasping unit enclasps the shell of the compressor;

s300: the connecting unit is connected with a crankshaft of the compressor;

s400: the detection module drives the first driving unit and detects torque when the connecting unit rotates, and the torque is a gap measurement index.

8. The gap detecting method according to claim 7, wherein the step S400 further comprises the steps of:

s500: judging whether the detected clearance measurement index meets the set condition, if so, considering that the clearance between the stator and the rotor of the compressor meets the design standard.

9. The gap detecting method according to claim 8, wherein the setting condition is that the detected gap measurement index is 0.25n.m or less.

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