A detecting device and method for the jumping height of a compressor rotor in the Z-axis direction

Abstract

The present invention relates to the technical field of compressors, and in particular to a device and method for detecting the run-out height of a compressor rotor in the Z-axis direction, comprising a sensing piece in the shape of a disc, eccentrically mounted on the top of a crankshaft, the rotation axis of the sensing piece being aligned with the center of an axial hole of a cylinder seat, the sensing piece rotating with the crankshaft and jumping up and down; a supporting assembly, on which a displacement sensor for detecting the up and down movement of the sensing piece is mounted; the sensing piece of the present invention is arranged on the top of the crankshaft to follow the up and down jumping thereof, and since the crankshaft and the rotor are synchronously jumping, the run-out of the rotor can be detected by detecting the up and down jumping of the sensing piece by the displacement sensor, and the real-time run-out height of the rotor can be directly measured.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly relates to a device and method for detecting the jumping height of a compressor rotor in the Z-axis direction. Background Art

[0002] A compressor is the core device of a refrigerator. In order to enable the rotor to rotate smoothly during the assembly process of the compressor, a gap is usually reserved between the rotor counterbore and the end of the cylinder block shaft hole when assembling the rotor, so as to achieve the purpose of enabling the rotor to work smoothly. This gap is called the axial gap.

[0003] During the operation of the compressor, due to the existence of the axial gap and the influence of the rotation of the rotor, the rotor and the crankshaft will repeatedly jump in the Z-axis direction, resulting in contact between the rotor counterbore and the end face of the cylinder block shaft hole, and causing wear on the end face of the tail of the rotor counterbore and the cylinder block shaft hole. On the one hand, the wear debris will cause wear of the friction pair of the compressor, resulting in an increase in the power of the compressor and a decline in the performance of the compressor. In severe cases, jamming may occur; on the other hand, it will cause abnormal noise in the compressor. In order to improve this phenomenon, it is necessary to accurately measure the jumping height of the rotor in the Z-axis direction during the operation of the compressor, find out the jumping law, so as to carry out targeted control during the production process.

[0004] The existing technology is to fix the cylinder block with the rotor in a stationary state and measure the axial gap of the rotor with a micrometer, which is equivalent to the jumping height of the rotor in the Z-axis direction. However, the axial gap of the rotor is the maximum value of the jumping height of the rotor during the operation of the compressor and cannot reflect the actual Z-axis jumping height of the compressor rotor. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for detecting the jumping height of a compressor rotor in the Z-axis direction to solve the problem that the actual Z-axis jumping height of the rotor cannot be reflected by measuring the axial gap. To achieve the above purpose, the present invention is solved by the following technical solutions:

[0006] In a first aspect, the present invention provides a device for detecting the jumping height of a compressor rotor in the Z-axis direction, including;

[0007] An induction sheet, which is circular and eccentrically installed on the top of the crankshaft. The rotation axis of the induction sheet is aligned with the center of the cylinder block shaft hole, and the induction sheet rotates and jumps up and down following the crankshaft;

[0008] A support assembly, which is installed with a displacement sensor for detecting the up and down movement of the induction sheet.

[0009] As a further technical solution, the support assembly is installed on the cylinder block.

[0010] As a further technical solution, the support assembly includes a support plate mounted on the cylinder block.

[0011] As a further technical solution, the support plate is detachably connected to the cylinder block by bolts.

[0012] As a further technical solution, the center of the displacement sensor is aligned with the center of the induction sheet.

[0013] As a further technical solution, there is a set distance between the detection point of the displacement sensor and the induction sheet in the initial state.

[0014] As a further technical solution, the set distance is greater than the axial clearance during the assembly of the rotor.

[0015] As a further technical solution, a data processing system is further included for processing the displacement signals detected by the displacement sensor.

[0016] As a further technical solution, a workbench for placing the compressor is further included, and the workbench is an anti-vibration workbench.

[0017] In a second aspect, the present invention provides a detection method for a detection device of the Z-axis direction runout height of a compressor rotor according to the first aspect, including the following steps:

[0018] The induction sheet, the displacement sensor and its support assembly are installed on the compressor. The rotation axis of the induction sheet is aligned with the center of the cylinder block shaft hole. During the experiment, the compressor is placed on a horizontal plane, a rotation speed is preset, the compressor is started and waited until it reaches a stable rotation speed state, and then the runout height of the rotor at this rotation speed can be measured.

[0019] The beneficial effects of the present invention are as follows:

[0020] (1) In the present invention, the induction sheet is arranged at the top of the crankshaft and moves up and down with it. Since the crankshaft and the rotor move up and down synchronously, the runout of the rotor can be detected by detecting the up and down movement of the induction sheet by the displacement sensor, and the real-time runout height of the rotor can be directly measured, which is more accurate and direct compared with the prior art.

[0021] (2) In the present invention, when the compressor is working, the top of the crankshaft rotates at a high speed, and the induction sheet installed at the top of the crankshaft will also move continuously with the rotation of the crankshaft, resulting in the induction sheet being unable to align with the sensor and causing data acquisition failure. In order to ensure the position of the induction sheet remains unchanged in the present invention, the center of the induction sheet is aligned with the center of the cylinder block shaft hole during installation, so as to ensure that the induction sheet always rotates at the original position during work and ensure that it is always aligned with the displacement sensor.

[0022] (3) The support plate of the present invention is installed on the cylinder block, which can avoid the influence of the overall strong vibration of the compressor during operation on the measurement data, and can also maintain the same frequency as the overall weak vibration of the compressor, ensuring that the data measured by the sensor is the rotor runout height. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute a limitation to the present invention. It should also be understood that these drawings are shown for simplicity and clarity and are not necessarily drawn to scale. The present invention will now be described and explained with additional features and details by using the drawings, wherein:

[0024] Figure 1 shows a schematic diagram of the overall detection device in an embodiment of the present invention;

[0025] Figure 2 shows a schematic diagram of the structure of the detection device installed on the compressor in an embodiment of the present invention.

[0026] In the figure: 1, compressor; 11, rotor; 12, crankshaft; 13, cylinder block; 2, induction sheet; 3, displacement sensor; 4, support plate; 5, bolt; 6, amplifier; 7, power supply; 8, data collector; 9, computer; 10, workbench. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in the typical embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] Embodiment 1

[0029] As Figure 1 and Figure 2 shown, this embodiment provides a detection device for the runout height of the compressor rotor in the Z-axis direction, including:

[0030] The induction sheet 2 is circular and is eccentrically installed at the top of the crankshaft 12. The rotation axis of the induction sheet 2 is aligned with the center of the axis hole of the cylinder block. The induction sheet 2 rotates and moves up and down following the crankshaft 12;

[0031] The support assembly is installed with a displacement sensor 3 for detecting the up and down movement of the induction sheet 2.

[0032] It should be noted that the axis at the top of the crankshaft 12 is not the overall rotation axis of the crankshaft 12. The overall rotation axis of the crankshaft 12 coincides with the center of the axis hole of the cylinder block.

[0033] The induction piece is arranged on the top of the crankshaft 12 and moves up and down following it. Since the crankshaft 12 and the rotor 11 move synchronously, by detecting the up and down movement of the induction piece with a displacement sensor, the movement of the rotor can be detected, and the real-time movement height of the rotor 11 can be directly measured, which is more accurate and direct compared with the prior art.

[0034] When the compressor 1 is working, the top of the crankshaft 12 rotates at a high speed, and the induction piece installed on the top of the crankshaft 12 will also move continuously with the rotation of the crankshaft 12, resulting in the induction piece 2 not being aligned with the displacement sensor 3 and causing the failure of data acquisition. In order to ensure the position of the induction piece 2 remains unchanged, when installing, the center of the induction piece 2 needs to be aligned with the center of the cylinder block shaft hole, so as to ensure that the induction piece 2 always rotates at the original position during operation.

[0035] The induction piece 3 can adopt the induction piece in the existing technology. The reason for adopting the induction piece here is that it is light in weight and will not affect the movement of the crankshaft 12.

[0036] The support assembly is installed on the cylinder block 13. The support assembly includes a support plate 4 installed on the cylinder block 13. Installing the support plate 4 on the cylinder block 13 can avoid the influence of the overall strong vibration of the compressor 1 during operation on the measurement data, and can also maintain the same frequency as the weak vibration of the whole compressor, ensuring that the data measured by the sensor is the movement height of the rotor.

[0037] The above can be understood in this way. Some parts of the compressor itself have large vibrations and some have small vibrations. Since the cylinder block 13 has a large mass, the vibration reflected on it is small. Installing the support plate 4 on the cylinder block can avoid strong vibrations, which is relative to other components of the compressor. The crankshaft 12 and the rotor itself also have vibrations. If the support plate is installed on a structure outside the compressor, it will cause the support plate not to vibrate and cannot match the crankshaft 12 and the rotor, resulting in inaccurate detection. Therefore, a certain amount of weak vibration is required, and installing it on the cylinder block is more appropriate to ensure the accuracy of detection.

[0038] The support plate 4 is detachably connected to the cylinder block 13 through bolts 5 and can be disassembled after the test.

[0039] Aligning the center of the displacement sensor 3 with the center of the induction piece 2 can ensure the accuracy of the detection data.

[0040] In the initial state, there is a set distance between the detection point of the displacement sensor 3 and the induction piece 2. The set distance is greater than the axial clearance during the assembly of the rotor 11. In this embodiment, it can be set to be slightly larger, which will neither cause the induction piece to collide with the sensor, and at the same time can ensure that the detection point of the displacement sensor maintains a small distance from the induction piece 2 to ensure the detection accuracy.

[0041] It further includes a data processing system for processing the displacement signals detected by the displacement sensor 3. The data processing system includes an amplifier 6, a power supply 7, a data collector 8, and a computer 9. When the induction piece 2 moves up and down following the crankshaft 12, the movement condition is captured by the displacement sensor 3 as an electrical signal. The electrical signal is transmitted to the amplifier 6, and after the amplifier 6 amplifies the electrical signal, it is recorded in the data collector 8. After being calculated and processed by the computer 9, the movement condition of the rotor during operation is finally presented on the screen.

[0042] It further includes a workbench 10 for placing the compressor 1. The workbench 10 is a vibration isolation workbench 10, which can reduce the influence of the outside on the compressor.

[0043] Embodiment 2

[0044] This embodiment provides a detection method for the detection device of the Z-axis direction jumping height of the compressor rotor according to Embodiment 1, including the following steps:

[0045] The induction piece 2, the displacement sensor 3 and its support assembly are installed on the compressor 1. The rotation axis of the induction piece 2 is arranged to align with the center of the cylinder block shaft hole. During the experiment, the compressor 1 is placed on the horizontal plane of the workbench 10. Since the distance dimension to be measured is very small, during the experiment, the compressor should be placed on the horizontal plane, and during the measurement, try not to touch the compressor to avoid generating errors. Preset the rotation speed, start the compressor 1 and wait for the compressor 1 to reach a stable rotation speed state to avoid measurement errors. The rotor 11 drives the crankshaft 12 to move up and down in the Z-axis direction. The induction piece 2 will move up and down following the crankshaft 12. The movement condition is captured by the displacement sensor 3 as an electrical signal. The electrical signal is transmitted to the amplifier 6, and after the amplifier 6 amplifies the electrical signal, it is recorded in the data collector 8. After being calculated and processed by the computer 9, the movement condition of the rotor during operation is finally presented on the screen.

[0046] Although the present invention has been disclosed above with preferred embodiments, it is not used to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A detection device for the Z-axis direction runout height of a compressor rotor, characterized in that Comprising: An induction piece, which is circular in shape and eccentrically installed at the top of the crankshaft. The rotation axis of the induction piece aligns with the center of the cylinder block shaft hole, and the center of the induction piece aligns with the center of the cylinder block shaft hole. The induction piece rotates and moves up and down following the crankshaft. A support assembly, which is installed with a displacement sensor for detecting the up and down movement of the induction piece. The support assembly is installed on the cylinder block. The support assembly includes a support plate installed on the cylinder block, and the support plate is detachably connected to the cylinder block by bolts.

2. The detecting device for the Z-axis direction runout height of a compressor rotor according to claim 1, wherein, The center of the displacement sensor aligns with the center of the induction piece.

3. The detecting device for the Z-axis direction runout height of a compressor rotor as claimed in claim 1, wherein, In the initial state, there is a set spacing between the detection point of the displacement sensor and the induction piece.

4. The detecting device for the Z-axis direction runout height of a compressor rotor as described in claim 3, characterized in that The set spacing is greater than the axial clearance during rotor assembly.

5. The detecting device for the Z-axis direction runout height of a compressor rotor as claimed in claim 1, wherein, It further includes a data processing system for processing the displacement signals detected by the displacement sensor.

6. The detecting device for the Z-axis direction runout height of a compressor rotor according to claim 1, wherein, It further includes a workbench for placing the compressor, and the workbench is a vibration isolation workbench.

7. The detection method of the detection device for the Z-axis direction runout height of the compressor rotor according to any one of claims 1-6, characterized in that, Including the following steps: The induction piece, the displacement sensor and its support assembly are installed on the compressor. The rotation axis of the induction piece is arranged to align with the center of the cylinder block shaft hole. During the experiment, the compressor is placed on a horizontal plane, a preset rotational speed is set, the compressor is started and waited for the compressor to reach a stable rotational speed state, and then the jumping height of the rotor at this rotational speed can be measured.

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