A method for judging assembly comprehensive precision of a compressor cylinder base and a motor

Abstract

The application discloses a kind of compressor cylinder seat and motor assembly comprehensive precision evaluation method, including cylinder seat, crankshaft, rotor and stator to be measured, cylinder seat is integrally processed three supporting legs and the crankshaft sleeve fixed on cylinder seat, the end face of supporting leg is respectively provided with screw hole and is common installation plane, stator core gauge and the inner hole diameter of stator to be measured are all 0.6mm larger than rotor outer diameter, steps are as follows: crankshaft passes through crankshaft sleeve;Rotor and crankshaft are tightly matched;Stator core gauge is pasted to installation plane and moves to make inner hole wall resist to rotor outer wall, arc plug gauge is inserted between them, when the maximum air gap between them is not less than 0.5mm, it indicates that the assembly combination of crankshaft sleeve, crankshaft and rotor has comprehensive vertical precision requirement relative to installation plane, if less than 0.5mm, it does not comply;When having the aforementioned vertical precision requirement, replace stator to be measured and repeat the aforementioned operation, when the maximum air gap is not less than 0.4mm, it indicates that stator to be measured has comprehensive vertical precision requirement relative to the installation plane, if less than 0.4mm, it does not comply.

Description

[Technical Field]

[0001] This invention relates to a method for evaluating the overall assembly accuracy of a compressor cylinder base and a motor, belonging to the field of refrigeration compressor technology. [Background Technology]

[0002] In the existing upstream and downstream supporting production process of compressor manufacturers and motor manufacturers, once a quality problem occurs, it is usually difficult to determine whether the problem lies in a part manufactured by the compressor manufacturer or a part produced by the motor manufacturer. A crankshaft sleeve is mounted on the cylinder block, and the crankshaft sleeve is used for crankshaft assembly. The motor stator is mounted on the support feet of the compressor's cylinder block, while the motor rotor is mounted on the crankshaft.

[0003] In practice, it has been found that the manufacturing precision of the motor rotor is easy to detect and can be effectively judged and quality controlled; the support legs and cylinder seats are machined as a single piece, so the levelness of the support leg end face is easy to ensure; the crankshaft machining technology is mature and its quality is controllable.

[0004] In practice, the following potential quality issues have also been identified:

[0005] 1. There is a high probability of defects in the vertical accuracy of the crankshaft sleeve relative to the cylinder block. When the accuracy of the crankshaft sleeve is defective, it will affect the vertical accuracy of the crankshaft relative to the cylinder block. The motor rotor pressed on the crankshaft will also have a vertical accuracy deviation. At this time, even if the accuracy of the motor stator is guaranteed, the stator-rotor air gap will still be difficult to meet the process design requirements.

[0006] 2. Because there are many parts on the motor stator, which is mainly composed of stator core, stator winding and end insulation frame, the manufacturing accuracy and assembly accuracy of motor stator are sometimes difficult to guarantee, and most stator cores have irregular shapes.

[0007] Therefore, how to effectively evaluate the overall assembly accuracy of the cylinder block and the motor is a technical problem that urgently needs to be solved. It is hoped that through continuous research on this topic, we can jointly improve the joint manufacturing level and supporting capabilities of compressor manufacturers and motor manufacturers. [Summary of the Invention]

[0008] The purpose of this invention is to provide a method for evaluating the overall assembly accuracy of the cylinder base and motor for compressors.

[0009] Therefore, the present invention provides the following technical solution:

[0010] A method for evaluating the overall assembly accuracy of a compressor cylinder base and motor includes a cylinder base, a crankshaft, a motor rotor, and a test piece. The method uses a stator core gauge and an arc-shaped feeler gauge for assessment. The cylinder base is integrally machined with three spaced-apart legs and a crankshaft sleeve fixed to the cylinder base. The end faces of the three legs with screw holes are located on the same mounting plane. Let the outer diameter of the rotor be D mm, the inner diameter of the stator core gauge be (D+0.6) mm, and the inner diameter of the test piece be (D+0.6) mm. The diameters of the bolt holes on the stator core gauge and the test piece are both larger than the diameters of the screw holes.

[0011] The method includes the following steps in sequence:

[0012] a) Install the crankshaft that has passed inspection and meets the quality requirements, and rotatably pass the crankshaft through the crankshaft sleeve.

[0013] b) Install the rotor that has passed the quality inspection and meets the requirements, and then press-fit the rotor to the crankshaft.

[0014] c) Evaluating overall vertical accuracy

[0015] First, attach the stator core gauge to the mounting surface of the three support legs. Move the stator core gauge so that its inner hole wall touches the outer wall of the rotor. Then, insert the arc-shaped feeler gauge between the stator core gauge and the rotor.

[0016] When the maximum air gap between the stator core gauge and the rotor is not less than 0.5mm, it indicates that the assembly of the crankshaft sleeve, crankshaft and rotor has the comprehensive vertical accuracy requirement relative to the mounting plane. If the maximum air gap between the stator core gauge and the rotor is less than 0.5mm, it indicates that the assembly of the crankshaft sleeve, crankshaft and rotor does not meet the comprehensive vertical accuracy requirement relative to the mounting plane.

[0017] d) When the comprehensive vertical accuracy requirement described in step c) is met, first remove the stator core gauge and replace the probe to be measured, then move the probe to be measured so that its inner hole wall touches the outer wall of the rotor, and then insert the arc-shaped feeler gauge between the probe to be measured and the rotor.

[0018] When the maximum air gap between the test specimen and the rotor is not less than 0.4 mm, it indicates that the test specimen meets the comprehensive vertical accuracy requirements relative to the mounting plane. If the maximum air gap between the test specimen and the rotor is less than 0.4 mm, it indicates that the test specimen does not meet the comprehensive vertical accuracy requirements relative to the mounting plane.

[0019] Preferably, the maximum air gap between the test numerator and the rotor is 0.6 mm.

[0020] This invention has the following advantages and positive effects:

[0021] This method can effectively determine whether the assembly of the crankshaft sleeve, crankshaft and rotor meets the comprehensive vertical accuracy requirements relative to the mounting plane of the support. After meeting the aforementioned requirements, this method can also effectively determine whether the test specimen also meets the comprehensive vertical accuracy requirements relative to the mounting plane of the support. The operation is practical, simple and intuitive. [Attached Image Description]

[0022] Fig. 1 This is the front view of the cylinder block;

[0023] Fig. 2 It is a 3D view of the cylinder block;

[0024] Fig. 3 It is a diagram showing the external shape of the crankshaft that passes through the crankshaft sleeve;

[0025] Fig. 4 It is a three-dimensional view of the crankshaft passing through the crankshaft sleeve;

[0026] Fig. 5 It is a view of the crankshaft with the rotor press-fitted in place;

[0027] Fig. 6 This is a schematic diagram of the stator core gauge with support feet and its mounting platform. One position of the inner hole of the stator core gauge touches the rotor, and an arc-shaped feeler gauge is inserted in the opposite position.

[0028] Fig. 7 This is a schematic diagram of the mounting platform with the support feet attached to the probe to be measured. The inner hole of the probe to be measured touches the rotor at one position, and an arc-shaped feeler gauge is inserted at the opposite position.

Detailed Implementation Methods

[0029] Please see Figs. 1-7 As shown, a method for evaluating the overall assembly accuracy of a compressor cylinder base and a motor includes a cylinder base 1, a crankshaft 2, a motor rotor 3, and a test rotor 5. The method uses a stator core gauge 4 and an arc-shaped feeler gauge 6 for evaluation. The cylinder base 1 is integrally machined with three spaced-apart legs 11 and a crankshaft sleeve 10 fixed on the cylinder base 1. The end faces of the three legs with screw holes 110 are located on the same mounting plane 111. Let the outer diameter of the rotor 3 be D mm, the inner diameter of the stator core gauge 4 be (D+0.6) mm, and the inner diameter of the test rotor 5 be (D+0.6) mm. The diameter of the bolt through hole 40 on the stator core gauge 4 and the diameter of the bolt through hole 50 on the test rotor 5 are both larger than the diameter of the screw hole 110.

[0030] Three support legs are arranged around the crankshaft sleeve.

[0031] The arc-shaped surface of the feeler gauge matches the outer circumference of the rotor of the corresponding specification, and the width of the arc-shaped feeler gauge is between 6 and 8 mm.

[0032] In this embodiment, the outer diameter of the rotor is D = 48.4 mm, and the inner diameter of the stator core gauge and the rotor to be measured is 49 mm.

[0033] In practice, the diameter of the bolt hole in the stator core gauge is 1mm larger than the diameter of the screw hole in the support. Similarly, the diameter of the bolt hole in the rotor to be measured is 1mm larger than the diameter of the screw hole in the support. This ensures that both the stator core gauge and the rotor to be measured can move in a plane relative to the support, so that the inner wall of both the stator core gauge and the rotor to be measured can be attached to the outer wall of the rotor.

[0034] The method includes the following steps in sequence:

[0035] a) Install the crankshaft 2, which has passed the quality inspection and meets the requirements, and rotatably pass the crankshaft through the crankshaft sleeve 10.

[0036] The quality acceptance of crankshafts is based on conventional tests of outer diameter and cylindricity.

[0037] There is a radial assembly clearance of 0.01 mm between the crankshaft and the crankshaft sleeve. When the inner diameter of the crankshaft sleeve 10 is 12.007 mm, the diameter of the main body section of the crankshaft 2 for press-fitting the rotor 3 (not visible in the figure) is 11.997 mm.

[0038] b) Install the rotor 3, which has passed the quality inspection and meets the requirements, and press-fit the rotor and crankshaft 2 together.

[0039] The quality acceptance of the rotor is based on the conventional method of testing the coaxiality of the outer diameter and outer circle with respect to the inner hole.

[0040] c) Evaluating overall vertical accuracy

[0041] First, attach the stator core gauge 4 to the mounting surface 111 of the three support legs 11. Move the stator core gauge 4 so that its inner hole wall contacts the outer wall of the rotor 3. After contact, pass the bolt 7 through the bolt hole 40 until it is screwed into the bolt hole 110 and apply a little torque to the bolt (e.g., 13-15 N.m). Then, insert the arc-shaped feeler gauge 6 between the stator core gauge 4 and the rotor 3. Applying torque to the bolt can prevent the stator core gauge 4 from failing to contact after the arc-shaped feeler gauge is inserted.

[0042] When the maximum air gap between the stator core gauge 4 and the rotor 3 is not less than 0.5mm, it indicates that the assembly of the crankshaft sleeve 10, crankshaft 2 and rotor 3 meets the comprehensive vertical accuracy requirement relative to the mounting plane 111. If the maximum air gap between the stator core gauge and the rotor is less than 0.5mm, it indicates that the assembly of the crankshaft sleeve, crankshaft and rotor does not meet the comprehensive vertical accuracy requirement relative to the mounting plane 111.

[0043] The maximum air gap is located on the opposite side of the side where the inner wall of the stator core gauge abuts the outer wall of the rotor.

[0044] d) When the comprehensive vertical accuracy requirements described in step c) are met, first remove the stator core gauge 4 and replace the probe to be measured 5. Then move the probe to be measured 5 so that its inner wall contacts the outer wall of the rotor 3. After contact, pass the bolt 7 through the bolt hole 50 until it is screwed into the screw hole 110 and apply a little torque to the bolt (e.g., 13-15 N·m). Then insert the arc-shaped feeler gauge 6 between the probe to be measured 5 and the rotor 3. Applying torque to the bolt can prevent the probe to be measured 5 from failing to contact the rotor 3 after the arc-shaped feeler gauge is inserted.

[0045] When the maximum air gap between the test element 5 and the rotor 3 is not less than 0.4 mm, it indicates that the test element 5 meets the comprehensive vertical accuracy requirements relative to the mounting plane 111. If the maximum air gap between the test element and the rotor is less than 0.4 mm, it indicates that the test element does not meet the comprehensive vertical accuracy requirements relative to the mounting plane 111.

[0046] The maximum air gap is located on the opposite side of the side where the inner wall of the rotor to be measured abuts the outer wall of the rotor.

[0047] The positions of the bolt holes on the stator core gauge and the specimen to be measured are all corresponding to the support legs. The stator core gauge and the specimen to be measured each have three bolt holes of 40 and 50 respectively.

[0048] As a preferred implementation, the maximum air gap position between the test numerator 5 and the rotor 3 is 0.6 mm.

[0049] The crankshaft 2 has a conventional structure, consisting of an integral balance block section, a crankshaft section, an oil groove shaft section, a main body section, and an oil suction pipe section. The crankshaft section extends axially from one end face of the balance block section, while the oil groove shaft section, the main body section, and the oil suction pipe section extend axially from the other end face of the balance block section in sequence. The rotor is press-fitted onto the main body section. The crankshaft section is fixedly connected to a small annular sleeve (conventional) located at one end of the connecting rod, while a large annular sleeve (conventional) at the other end of the connecting rod is movably mounted in the cylinder block of the cylinder seat.

[0050] The stator core of the test specimen 5 is formed by stacking and riveting multiple stator laminations. The perpendicularity deviation of the inner hole axis of the test specimen 5 relative to its own mounting plane is allowed to be no more than 0.1mm. The method of the present invention is particularly applicable when the outer edge of the test specimen 5 is irregular. The stator core gauge is precision machined from a whole iron block, and its outer edge is also irregular.

Claims

1. A method for evaluating the overall assembly accuracy of a compressor cylinder base and motor, comprising a cylinder base, crankshaft, motor rotor, and a test piece, wherein the accuracy is determined using a stator core gauge and an arc-shaped feeler gauge. The cylinder block is integrally machined with three spaced-apart legs and a crankshaft sleeve fixed to the cylinder block. The end faces of the three legs with screw holes are all on the same mounting plane. Let the rotor's outer diameter be D mm, the stator core gauge's inner diameter be (D+0.6) mm, and the rotor to be measured's inner diameter be (D+0.6) mm. The diameters of the bolt holes on both the stator core gauge and the rotor to be measured are larger than the diameters of the screw holes. Its characteristics are The method includes the following steps in sequence: a) Install crankshafts that have passed quality inspection and meet the requirements. The crankshaft is rotatably passed through the crankshaft sleeve; b) Install rotors that have passed quality inspection and meet the requirements. The rotor and crankshaft are tightly fitted together by press fitting. c) Evaluate overall vertical accuracy. First, attach the stator core gauge to the mounting surface of the three support legs. Move the stator core gauge until its inner wall touches the outer wall of the rotor. Then, insert a feeler gauge between the stator core gauge and the rotor. When the maximum air gap between the stator core gauge and the rotor is not less than 0.5mm, it indicates that the assembly of the crankshaft sleeve, crankshaft and rotor has the comprehensive vertical accuracy requirement relative to the mounting plane. If the maximum air gap between the stator core gauge and the rotor is less than 0.5mm, it indicates that the assembly of the crankshaft sleeve, crankshaft and rotor does not meet the comprehensive vertical accuracy requirement relative to the mounting plane. d) When the comprehensive vertical accuracy requirements described in step c) are met, first remove the stator core gauge and replace the probe to be measured. Then, move the probe to be measured so that its inner wall touches the outer wall of the rotor. Finally, insert a feeler gauge between the probe to be measured and the rotor. When the maximum air gap between the test specimen and the rotor is not less than 0.4 mm, it indicates that the test specimen meets the comprehensive vertical accuracy requirements relative to the mounting plane. If the maximum air gap between the test specimen and the rotor is less than 0.4 mm, it indicates that the test specimen does not meet the comprehensive vertical accuracy requirements relative to the mounting plane.

2. The method for evaluating the overall assembly accuracy of the compressor cylinder base and motor according to claim 1, characterized in that: The maximum air gap between the test specimen and the rotor is 0.6 mm.

Images