Rotary compressor inspection device, rotary compressor, and method for manufacturing a rotary compressor

Abstract

A rotary compressor inspection device (70) for inspecting a rotary compressor (100), which is provided with a cylinder (1), a columnar piston (2) that performs eccentric rotation along the inner peripheral surface of the cylinder (1) to constitute a compression chamber (CO), and a vane (5) that is supported so as to be able to advance and retreat with respect to the radial direction of the compression chamber (CO) in conjunction with the eccentric rotation of the piston (2), is provided with: a measuring instrument (72) that measures the flow rate per unit time of gas flowing through an intake port (1IN) that is in communication between the compression chamber (CO) and the outside of the cylinder (1); and a control unit (75) that determines whether or not the size of the clearance between the piston (2) and the cylinder (1) exceeds a set threshold range (X1), on the basis of the measured flow rate.

Description

Technical Field

[0001] The present disclosure relates to an inspection apparatus for a rotary compressor, a rotary compressor, and a method for manufacturing a rotary compressor.

Background Art

[0002] Conventionally, when manufacturing a rotary compressor, first, each component such as a hollow cylinder having a space serving as a compression chamber inside, a crankshaft serving as a rotating shaft, a piston that is fitted to the crankshaft and rotates eccentrically, and a bearing of the crankshaft is processed with high precision. Then, these components are fastened with bolts and assembled to form a compression mechanism portion that causes the space formed in the cylinder to function as a compression chamber. In order to continuously and efficiently compress the refrigerant sealed in the compression chamber, it is necessary to keep the clearance between the cylinder and the piston below a set value. Therefore, at the time of assembling the compression mechanism portion, the following method for measuring the clearance between the cylinder and the piston in a rotary compressor, which measures the clearance between the cylinder and the piston with high precision, has been disclosed.

[0003] That is, the method for measuring the clearance between the cylinder and the rolling piston in a conventional rotary compressor is to bring a measuring probe into contact with a point on the circumferential surface of the rotating shaft and a point on the inner peripheral wall of the cylinder and read the interval dimension between them. Similarly, the maximum interval dimension between a point on the circumferential surface of the rotating shaft and a point on the outer periphery of the roller is read. The clearance is measured based on the difference between these two interval dimensions (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the conventional measurement method described above requires the measuring probe to be brought into contact with each component of the cylinder and piston, which poses a risk of damaging the surface of the components during measurement and potentially leading to a decrease in compressor quality, such as compression performance.

[0006] This disclosure provides technology to solve the above-mentioned problems, and aims to provide a rotary compressor inspection device that can accurately measure the clearance between the cylinder and piston without causing a decrease in compression performance, a rotary compressor with high performance, and a method for manufacturing a rotary compressor that can produce a rotary compressor with high performance. [Means for solving the problem]

[0007] The rotary compressor inspection apparatus disclosed in this disclosure is A cylinder in which a space that serves as a compression chamber is formed inside, A cylindrical piston is fitted onto a rotating shaft inserted into the aforementioned space, and rotates eccentrically within the space along the inner circumferential surface of the cylinder as the rotating shaft rotates, thereby constituting the compression chamber. A rotary compressor inspection device for inspecting a rotary compressor comprising vanes supported so as to be able to move back and forth in the radial direction of the compression chamber in accordance with the eccentric rotation of the piston, A measuring instrument for measuring the flow rate per unit time of gas flowing through an intake port that connects the compression chamber provided in the cylinder with the outside of the cylinder, A control unit that determines whether the clearance between the outer surface of the piston and the inner surface of the cylinder exceeds a set threshold range based on the measured flow rate, Equipped with, It is. Furthermore, the rotary compressor disclosed in this disclosure is A rotary compressor inspection device configured as described above was used to manufacture the following: It is. Furthermore, the method for manufacturing a rotary compressor disclosed herein is: A cylinder in which a space that serves as a compression chamber is formed inside, A cylindrical piston is fitted onto a rotating shaft inserted into the aforementioned space, and rotates eccentrically within the space along the inner circumferential surface of the cylinder as the rotating shaft rotates, thereby constituting the compression chamber. A method for manufacturing a rotary compressor, comprising: a vane supported so as to be able to move back and forth in the radial direction of the compression chamber in accordance with the eccentric rotation of the piston; A flow process in which gas is passed through an intake port that connects the compression chamber provided in the cylinder with the outside of the cylinder, A measurement step of measuring the flow rate per unit time of the gas flowing through the aforementioned intake port, Based on the measured flow rate, a threshold value is set for the clearance between the inner surface of the cylinder and the piston. range A determination process to determine whether or not it exceeds the limit. ,of Prepare It is. [Effects of the Invention]

[0008] The rotary compressor inspection device disclosed herein provides a rotary compressor inspection device that can accurately measure the clearance between the cylinder and the piston without causing a decrease in compression performance, a rotary compressor with high performance, and a method for manufacturing a rotary compressor that can produce a rotary compressor with high performance. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows the schematic configuration of the compression mechanism of a rotary compressor and the inspection device for the rotary compressor according to Embodiment 1. [Figure 2] This is a longitudinal cross-sectional view showing the schematic configuration of a rotary compressor according to Embodiment 1. [Figure 3] This is a longitudinal cross-sectional view showing an enlarged view of the main part of the compression mechanism of the rotary compressor according to Embodiment 1. [Figure 4]It is a cross-sectional view showing an enlarged main part of a compression mechanism part included in a rotary compressor according to Embodiment 1. [Figure 5] It is a flowchart showing a manufacturing method of a rotary compressor according to Embodiment 1. [Figure 6] It is a diagram showing the configuration of a database recorded by a control unit of an inspection device according to Embodiment 1. [Figure 7] It is a diagram showing a schematic configuration of another rotary compressor according to Embodiment 1 and an inspection device for this rotary compressor. [Figure 8] It is a block diagram showing the configuration of a learning unit of a control unit included in an inspection device for a rotary compressor. [Figure 9] It is a diagram showing an example of the hardware configuration of a control unit included in an inspection device for a rotary compressor. [Figure 10] It is a diagram showing a schematic configuration of a rotary compressor according to Embodiment 2 and an inspection device for this rotary compressor. [Figure 11] It is a diagram showing a schematic configuration of a compression mechanism part of a rotary compressor according to Embodiment 3 and an inspection device for the rotary compressor. [Figure 12] It is a longitudinal sectional view showing an enlarged main part of a compression mechanism part included in a rotary compressor according to Embodiment 3. [Figure 13] It is a diagram showing the configuration of a database recorded by a control unit of an inspection device according to Embodiment 3.

MODE FOR CARRYING OUT THE INVENTION

[0010] Embodiment 1. Hereinafter, an inspection device for a rotary compressor, a rotary compressor, and a manufacturing method of a rotary compressor according to the present embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an inspection device 70 for a rotary compressor according to Embodiment 1 and a compression mechanism part 50 to be inspected. FIG. 2 is a longitudinal sectional view showing a schematic configuration of a rotary compressor 100 including the compression mechanism part 50 shown in FIG. 1. In the following explanation, the axial and radial directions of a compression chamber, which is cylindrical in shape around a rotation axis, will be denoted as axial Y and radial X, respectively.

[0011] The rotary compressor inspection device 70 according to Embodiment 1 (hereinafter referred to as the inspection device 70) inspects for assembly defects in the manufacturing process of the compression mechanism 50 of the rotary compressor 100 (hereinafter referred to as the compressor 100). First, we will explain the configuration of the compressor 100, which is equipped with the compression mechanism 50 that is the subject of inspection.

[0012] The compressor 100 is a compression machine that draws in low-pressure refrigerant as a substance into a sealed space inside, compresses the drawn-in low-pressure refrigerant, and discharges high-pressure refrigerant to the outside. As shown in Figure 2, the compressor 100 is configured with a single (single-stage) compression mechanism 50 and a drive unit 30 installed in the axial direction Y, housed inside the pressure tank 10. The pressure tank section 10 comprises a cylindrical intermediate shell 10C, an upper shell 10A that closes the upper opening in the axial direction Y of the intermediate shell 10C, and a lower shell 10B that closes the lower opening, forming a sealed space. The upper shell 10A is also provided with a discharge pipe 11 that discharges the generated high-pressure refrigerant to the outside of the pressure tank section 10.

[0013] The compression mechanism 50 is connected to the drive unit 30, which acts as an electric motor, via the shaft 20. The compression mechanism 50 uses the rotational driving force transmitted from the drive unit 30 via the shaft 20 to compress the low-pressure refrigerant and generate a high-pressure refrigerant. The drive unit 30 comprises a rotor 30R and a stator 30S, and is powered via a connector (not shown) to rotate the shaft 20.

[0014] The detailed configuration of the compression mechanism 50 will now be described. Figure 3 is a cross-sectional view showing an enlarged view of the main part of the compression mechanism 50, which is installed inside the rotary compressor 100 shown in Figure 2. For illustrative purposes, the compression mechanism 50 shown in Figure 3 is shown with the axial direction Y reversed compared to Figure 1. Figure 4 is a cross-sectional view of the compression mechanism 50 shown in Figure 3, viewed from an AA perspective.

[0015] The compression mechanism 50 comprises a hollow cylindrical cylinder 1, a shaft 20 inserted into the internal space of the cylinder 1, a crank 20A fitted to the one end of the shaft 20 in the axial direction Y, a piston 2 fitted to the outer surface of the crank 20A, a frame 4 that closes the opening at one end of the cylinder 1 in the axial direction Y, a head 3 that closes the opening at the other end of the cylinder 1 in the axial direction Y, and vanes 5 that partition the internal space of the cylinder 1.

[0016] As shown in Figure 2, the outer circumferential surface of cylinder 1 is attached to the inner circumferential surface of the intermediate shell 10C of the pressure tank section 10. The shaft 20 is rotatably supported by the head 3 and the frame 4. The crankshaft 20A performs eccentric motion within the internal space of the cylinder 1. In this way, the cylindrical piston 2, which is attached to the outer surface of the crankshaft 20A, rotates eccentrically within the internal space of the cylinder 1 along the inner surface 1S of the cylinder 1 as the shaft 20 rotates.

[0017] As shown in Figure 4, the cylinder 1 has an intake port 1IN formed to connect the internal space, which will become the compression chamber CO described later, with the outside of the cylinder 1. This intake port 1IN serves as a passage for drawing low-pressure refrigerant from the outside of the cylinder 1 into the internal space of the cylinder 1, which will become the compression chamber CO. Furthermore, the cylinder 1 is provided with a discharge port 1OUT formed by cutting out a portion of the inner circumferential surface 1S and extending in the axial direction Y. This discharge port 1OUT is formed to penetrate only one side of the cylinder 1 in the axial direction Y, and connects the internal space of the cylinder 1 with the outside of one side of the cylinder 1 in the axial direction Y, thereby discharging the compressed high-pressure refrigerant to that side of the cylinder 1 in the axial direction Y.

[0018] Between the intake port 1IN and the discharge port 1OUT, a groove 1M is provided that extends from the inside to the outside in the radial direction X of the cylinder 1 and penetrates in the axial direction Y of the cylinder 1. A vane 5 is provided in this groove 1M, having the same axial length Y as the axial length Y of the cylinder 1, and reciprocating within the groove 1M in the radial direction X. The vane 5 is held by a sliding surface 1MS so as to be slidable in the radial direction X.

[0019] A spring 6 is positioned on the outer side of groove 1M in the radial direction X, and the spring force of this spring 6 presses the vane 5 inward in the radial direction X. In this way, the inner tip of the vane 5 in the radial direction X is pressed against the outer surface 2S of the piston 2 by the spring 6 as it moves back and forth within the groove 1M, so as to always be in contact with the outer surface 2S of the piston 2 in response to the rolling motion of the piston 2.

[0020] In this way, a sealed compression chamber CO is formed by the inner circumferential surface 1S of cylinder 1, the end face of one end of head 3 in the axial direction Y, the end face of the other end of frame 4 in the axial direction Y, and the outer circumferential surface 2S of piston 2. The vane 5, installed between the intake port 1IN and the discharge port 1OUT, has its tip in contact with the outer circumferential surface 2S of piston 2, thereby dividing the compression chamber CO into a first compression chamber CO1, a low-pressure space on the intake port 1IN side, and a second compression chamber CO2, a high-pressure space on the discharge port 1OUT side.

[0021] The piston 2, fitted to the crank 20A by the drive unit 30, rotates eccentrically within the cylinder 1, drawing low-pressure refrigerant into the compression chamber CO through the intake port 1IN. As the piston 2 rotates eccentrically, the volume of the compression chamber CO decreases, compressing the refrigerant. When the refrigerant is compressed to a pressure above the desired level, a valve (not shown) provided at the discharge port 1OUT opens, discharging the compressed high-pressure refrigerant to the outside of the cylinder 1. The high-pressure refrigerant is then sent, for example, to the piping of an outdoor unit of an air conditioner.

[0022] A clearance G1 is provided so that the outer surface 2S of the piston 2 and the inner surface 1S of the cylinder 1 do not interfere with each other when the piston 2 rotates eccentrically along the inner surface 1S of the cylinder 1. In order to continuously and efficiently compress the refrigerant sealed in the compression chamber CO, it is necessary for the piston 2 to rotate eccentrically while the clearance G1 is always kept below a certain value. Therefore, when assembling a compressor 100 with the above structure, it is necessary to align the axis of the shaft 20, which is the rotation center of the piston 2, with the center of the cylinder 1, requiring high-precision alignment work.

[0023] Next, the configuration of the inspection device 70 of this embodiment 1, which inspects the size of the clearance G1 between the cylinder 1 and the piston 2 in the compression mechanism 50 configured as described above, will be explained in detail with reference to Figure 1. As shown in Figure 1, the inspection device 70 includes a supply unit 71 that injects factory air as a gas into the compression chamber CO through an intake port 1IN, a measuring instrument 72 that measures the flow rate V per unit time of the factory air supplied from the supply unit 71 and flowing through the intake port 1IN provided in the cylinder 1, and a control unit 75 that inspects the size of the clearance G1 between the cylinder 1 and the piston 2 based on the measured flow rate V. The factory air supplied from the supply unit 71 is injected into the compression chamber CO via supply pipes 73 such as pipes and tubes.

[0024] In this embodiment, the inspection device 70 detects the clearance G1 by sealing factory air into the intake port 1IN at the stage after the assembly of the compression mechanism 50, before the compressor 100 shown in Figure 2 is completed. Specifically, at the stage when a compression chamber CO, which is a sealed space for compressing the refrigerant, is formed inside the cylinder 1, and this compression chamber CO is divided by the vane 5 into two spaces: a low-pressure space on the intake port 1IN side and a high-pressure space on the discharge port 1OUT side, that is, when the cylinder 1, piston 2, head 3, frame 4, and vane 5 are assembled, the inspection device 70 injects factory air from the intake port 1IN.

[0025] The factory air injected into the compression chamber CO circulates within the sealed space of cylinder 1, including the clearance G1 between the inner circumferential surface 1S of cylinder 1 and the piston 2, the axial clearance G2 between the piston 2 and vane 5 and the frame 4, and the axial clearance G3 between the piston 2 and vane 5 and the head 3, as shown in Figure 3.

[0026] In general, in the compression mechanism of a rotary compressor, the clearance between parts in the axial direction Y (thrust direction) has a greater impact on the amount of refrigerant leakage loss compared to the clearance in the radial direction X (radial direction). Furthermore, because part tolerances accumulate in the radial direction X, it is necessary to avoid the malfunction in which the piston comes into contact with the cylinder and stops the compression motion during operation of the rotary compressor. Therefore, the minimum clearance between the cylinder and piston in the radial direction X is designed to be larger than the clearance between parts in the axial direction Y. In other words, in the compressor 100 of this embodiment, the minimum clearance G1 in the radial direction X between the inner circumferential surface 1S of the cylinder 1 and the outer circumferential surface 2S of the piston 2, which is the object of measurement, is the most dominant factor in the flow rate of the injected factory air.

[0027] In other words, if the assembly precision of the compression mechanism 50 is high and the clearance G1 is small, the air resistance passing through the clearance G1 becomes large, and the amount of factory air injected tends to decrease over time. Therefore, the flow rate V, which is the injection flow rate of factory air per unit time, decreases. Therefore, by measuring the flow rate of factory air injected from the intake port 1IN while the discharge port 1OUT is sealed, it is possible to determine whether or not the clearance G1 is within the specified dimensions.

[0028] The following describes a method for manufacturing a rotary compressor using the inspection device 70 of this embodiment. Figure 5 is a flowchart showing a method for manufacturing a rotary compressor using the inspection device 70 of this embodiment. The inspection device 70 comprises two steps: a preparation step and an inspection step.

[0029] First, a test compression mechanism with the same configuration as the compression mechanism 50 of the compressor 100 to be inspected is prepared in advance. Then, the discharge port 1OUT of the test compression mechanism is blocked. Then, using the inspection device 70, a clearance setting process is performed in which the cylinder 1 is positioned so that the size of the clearance G1, which is the gap between the inner circumferential surface 1S of the cylinder 1 and the piston 2, becomes a set size, for example, 0.03 mm (step S1).

[0030] Next, a flow process is performed in which factory air is injected from the supply unit 71 into the compression chamber CO through the intake port 1IN, thereby allowing the factory air to flow through the intake port 1IN (step S2). Next, a measurement process is performed in which the flow rate V of the factory air flowing through the intake port 1IN per unit time is measured and recorded using the measuring instrument 72 (step S3). Next, a step is performed to determine whether the flow rate V has been obtained for each of the set clearances G1 of different sizes (step S4). For example, if the clearance G1 is changed in increments of 0.01 mm within the range of 0.03 mm to 0.12 mm, the number of settings n will be 10.

[0031] If the recorded flow rate V is less than the set number n and the desired clearance G1 size has not been obtained (step S4, NO), return to step S1, change the size of clearance G1, perform the process up to step S3, obtain and record the flow rate V.

[0032] If the recorded flow rate V reaches a set number (S4, YES), a database DB is created showing the flow rate V for each recorded clearance G1 size (database creation step S5).

[0033] This section describes the database that was created. Figure 6 shows the configuration of the database DB recorded by the control unit 75 of the inspection device 70 in this embodiment. The database DB shows the correlation between the change in the amount of change in the flow rate V of the injected factory air and the change in the size of the clearance G1. It can be seen that as the clearance G1 increases, the measured flow rate V also tends to increase.

[0034] The control unit 75 of the inspection device 70 in this embodiment is equipped with a database DB that shows the correlation between such clearance G1 and flow rate V, which is recorded in advance during the preparation process. This makes it possible to accurately estimate the size of the clearance G1 in the assembled compression mechanism 50 by injecting factory air into the compression mechanism 50 assembled during the manufacturing process of the compressor 100 and measuring the flow rate V.

[0035] Furthermore, the dimensional range in which clearance G1 is below the specified value and judged as acceptable is set to be within the dimensional range of threshold range X1 shown in Figure 6. This allows us to determine that clearance G1 exceeds the specified dimension when the flow rate V measured in the inspection process exceeds the flow rate of the first A reference value Vo, which is the flow rate corresponding to the threshold Ro, the upper limit of threshold range X1, or falls below the first B reference value Vo', which is the flow rate corresponding to the threshold Ro', the lower limit of threshold range X1, as explained below.

[0036] However, the threshold range X1, which is the dimensional range judged as acceptable in Figure 6, does not include the dimensional range where the clearance G1 is 0. Generally, if the clearance G1 is too narrow, the rotation of the piston 2 will be impaired due to the effect of the oil film. When the rotation of the piston 2 is impaired, problems such as increased vibration during the operation of the compressor 100 and increased load on the motor occur. Therefore, a threshold Ro' is set in advance as the lower limit of the clearance G1, and the first B reference value Vo' of the flow rate corresponding to this threshold Ro' is derived. By setting and managing the lower limit of the clearance G1 in this way, the operational soundness of the compressor 100 can be ensured.

[0037] Furthermore, if the dimensional range in which clearance G1 is judged as acceptable is narrow, for example, a few μm to about 10 μm, the error is small even if the flow rate between threshold Ro, which is the upper limit of the threshold range X1, and threshold Ro', which is the lower limit, is linearly approximated and interpolated. In this case, if the control unit 75 has obtained a first A reference value Vo, which is the flow rate corresponding to threshold Ro, and a first B reference value Vo', which is the flow rate corresponding to threshold Ro', it is possible to derive the flow rate between this first A reference value Vo and the first B reference value Vo' by linear approximation and estimate the size of clearance G1 at each flow rate within the threshold range X1.

[0038] After the above preparation steps, the inspection device 70 performs an inspection step to inspect the compression mechanism 50 to be inspected. First, an assembly process is performed in which the cylinder 1, piston 2, head 3, frame 4, and vanes 5 that constitute the compression mechanism 50 are assembled (step S6).

[0039] Next, with the discharge port 1OUT of the compression mechanism 50 to be inspected blocked, a flow process is performed in which factory air is injected from the supply unit 71 into the compression chamber CO of the compression mechanism 50 to be inspected, and the factory air is passed through the intake port 1IN (step S7). Next, a measurement process is performed in which the flow rate V of the factory air injected from the supply unit 71 per unit time is measured and recorded by the measuring instrument 72 (step S8). Next, a determination step is performed (step S9) to determine whether the size of the clearance G1 exceeds the threshold range X1, based on the measured flow rate V and the database DB derived in the above preparation step.

[0040] If the size of the clearance G1 is within the specified dimensions within the threshold range X1, the assembled compression mechanism 50 is determined to be acceptable (step S9, YES), and the tank housing process is performed to house the compression mechanism 50 in the pressure tank 10 (step S10). If the size of clearance G1 exceeds the threshold range X1 and the assembled compression mechanism 50 is determined to be unacceptable (step S9, NO), an alignment process is performed to align the piston 2 (step S9A). Steps S7 to S9A are then repeated until the size of clearance G1 is within the threshold range X1.

[0041] In this way, a compression mechanism 50 is obtained that is assembled such that the clearance G1 between the cylinder 1 and the piston 2 is within the threshold range X1, and a rotary compressor 100 equipped with this compression mechanism 50 can be manufactured.

[0042] Thus, since the inspection device 70 does not bring inspection equipment such as measuring probes into contact with the cylinder 1 and piston 2 of the compression mechanism 50 to be inspected, it can accurately inspect the size of the clearance G1 without damaging the surface of the parts during measurement.

[0043] Furthermore, in the measurement method in which an inspection device such as a measuring probe is brought into contact with the cylinder 1 and piston 2, it is necessary to leave at least one of the upper shell 10A or the lower shell 10B of the pressure tank section 10 open. According to the inspection device 70 of this embodiment, it is sufficient that factory air can be sealed inside the cylinder 1, so it can be performed at any time as long as a sealed space for compressing the refrigerant is formed inside the cylinder 1. In other words, measurement is possible before or after the pressure tank section 10 is assembled to the compression mechanism section 50, which increases the design flexibility of the manufacturing process and contributes to reducing product costs.

[0044] Although the example shown involves performing the injection and measurement steps with the discharge port 1OUT of the compression mechanism 50 being inspected blocked, this is not the only option. While the behavior of the data in the created database DB will differ, the clearance G1 can also be inspected by performing the injection and measurement steps without blocking the discharge port 1OUT. Furthermore, although the above description assumes that the measurement process is performed after the injection process, the injection process and the measurement process may be performed in parallel. Alternatively, during the preparation process, a waveform showing the change over time in the flow rate of factory air per unit time at a set clearance G1 may be recorded in a database DB, and this waveform may be used to determine the clearance G1 during the inspection process.

[0045] Furthermore, if the thickness of the piston 2 in the axial direction Y, as shown in Figure 3, is small, and the clearance between the piston 2 and the frame 4 in the axial direction Y is large, the injected air will leak out through the clearance between the parts that occurs on both ends of the vane 5 in the axial direction Y within the groove 1M. Therefore, it is desirable that the inspection device 70 also be equipped with a mechanism to seal the groove 1M in the cylinder 1 to prevent factory air from flowing out of the groove 1M.

[0046] The following describes an inspection device 70 that uses a database DB with a different configuration than the database DB described above. In the preliminary steps for creating the database DB, the relationship between the change in flow rate V and the change in the angle of inclination of the piston 2's axis relative to the inner circumferential surface 1S of the cylinder 1 is recorded in the database DB beforehand. With this configuration, if the crank 20A and shaft 20, which are integrated with the piston 2, are assembled at an angle relative to the cylinder 1 during the inspection process, that tilt can be detected. This is because the tilt of the piston 2 creates a localized area of ​​high air resistance in the factory airflow path, and the flow rate V changes in accordance with the change in the angle of tilt of the piston 2 and shaft 20.

[0047] The following describes an inspection device 70 that uses a database DB with a different configuration than the database DB described above. By using this database DB, the inspection device 70 can detect abnormalities other than dimensional deviations in clearance G1, as described below. In the preliminary preparation process for creating the database DB, in addition to the first reference value Vo mentioned above, a second reference value Vn, as shown in Figure 6, is further set as a detection criterion for abnormal installation of each component constituting the compression mechanism. The magnitude relationship between the first reference value Vo and the second reference value Vn is Vo < Vn, and the second reference value Vn is set to be sufficiently large, larger than the reference flow rate set for the first reference value Vo.

[0048] As described above, since the flow rate V measured at the suction port 1IN is mainly due to the clearance G1, when the clearance G1 is near the threshold value Ro, the change in the measured flow rate may be regarded as corresponding to the change in the clearance G1. However, when the measured flow rate V significantly exceeds the first reference value Vo, which is the dimensional reference value of the clearance G1, and becomes equal to or greater than the second reference value Vn, it is considered that an abnormality other than the dimensional deviation of the clearance G1, that is, the misalignment of the piston 2, has occurred. Specifically, a significant increase in the flow rate V of the factory air to the suction port 1IN is caused by a dimensional deviation at a location other than the clearance G1, and the dimensional deviation is considered to be due to, for example, improper installation of the piston 2 and the vane 5 during the assembly of the compression mechanism portion 50.

[0049] Therefore, by newly setting a measurement criterion of the second reference value Vn that is sufficiently large with respect to the first reference value Vo, not only the determination of the clearance G1 but also the detection of improper installation of other components can be achieved in the same inspection system using the same inspection device. As a result, there is no need to separately provide an inspection process, and a highly productive manufacturing process can be obtained.

[0050] Hereinafter, an inspection device 70 using a feeder 71 having a configuration different from the above-described feeder 71 will be described. The feeder 71 that injects factory air into the compression chamber CO may have a function of adjusting the pressure of the supplied factory air to be below a set pressure value. By setting the injected factory air to a low pressure, the following three effects can be expected. Here, the low pressure refers to a pressure of about 0.1 MPa or less.

[0051] When the oil film adhering to the vicinity of the sealed space inside cylinder 1 that compresses the refrigerant bursts, air leaks out from minute gaps other than clearance G1, specifically the groove clearance between the inner wall of groove 1M of cylinder 1 and vane 5 in Figure 3, and the clearance between frame 4 and piston 2 in Figure 3. This can be a factor in errors in flow rate V. However, if the factory air injected is at a low pressure, the risk of the oil film bursting is reduced, allowing for more accurate measurements.

[0052] Furthermore, when high-pressure factory air is injected, the force pushing the vane 5 outward in the radial direction X of the cylinder 1 increases, whereas the spring 6 had been pushing the vane 5 into the cylinder 1. As a result, the vane 5 floats outward in the radial direction X within the groove 1M. In this case, the volume ratio of the part related to clearance G1 in the area where factory air circulates within the cylinder 1 becomes smaller, which can lead to a decrease in measurement error. However, if factory air adjusted to low pressure is used, the force pushing the vane 5 is small, so the vane 5 is less likely to float, and the measurable area can be ensured. Therefore, measurement with small errors becomes possible.

[0053] Furthermore, similar to the phenomenon described above with vane 5, high-pressure factory air increases the load on frame 4 from the sealed space inside cylinder 1, causing frame 4 to lift away from cylinder 1. As a result, the axial Y clearance between piston 2 and frame 4 inside cylinder 1 in Figure 3 increases, increasing the amount of air leakage from that point, and thus increasing the error in the measured flow rate at intake port 1IN. Therefore, using low-pressure air reduces the load on frame 4, making it less likely for frame 4 to lift, and enabling highly accurate measurements.

[0054] Furthermore, in order to adjust the factory air pressure as described above with greater precision, an inspection device 70A with the following configuration may be used. Figure 7 shows a schematic configuration of the inspection device 70A for another rotary compressor according to Embodiment 1, and the compression mechanism 50 to be inspected. The inspection device 70A of this embodiment includes a first regulator 71A that reduces the pressure of the factory air and a second regulator 71B that further reduces the pressure of the gas reduced by the first regulator 71A and supplies it into the compression chamber CO, as a supply device for injecting factory air into the compression chamber CO.

[0055] By configuring the supply unit that injects factory air into the CO compression chamber to adjust the pressure in two stages, the pressure of the injected factory air can be finely adjusted to any desired value. This makes it possible to suppress errors due to the measurement location compared to when factory air is directly sealed in without pressure adjustment. As a result, the measuring instrument 72 can obtain more accurate measurement results.

[0056] For the purposes of this explanation, the gas injected by the supply unit 71 is described as factory air, but the type of gas injected is not limited.

[0057] The inspection device for the rotary compressor of this embodiment, configured as described above, A cylinder in which a space that serves as a compression chamber is formed inside, A cylindrical piston is fitted onto a rotating shaft inserted into the aforementioned space, and rotates eccentrically within the space along the inner circumferential surface of the cylinder as the rotating shaft rotates, thereby constituting the compression chamber. A rotary compressor inspection device for inspecting a rotary compressor comprising vanes supported so as to be able to move back and forth in the radial direction of the compression chamber in accordance with the eccentric rotation of the piston, A measuring instrument for measuring the flow rate per unit time of gas flowing through an intake port that connects the compression chamber provided in the cylinder with the outside of the cylinder, A control unit that determines whether the clearance between the outer surface of the piston and the inner surface of the cylinder exceeds a set threshold range based on the measured flow rate, Equipped with, It is.

[0058] In this way, the rotary compressor inspection device measures the flow rate of gas flowing through the intake port per unit time and determines whether the clearance between the piston and cylinder exceeds a set threshold range based on the measured gas flow rate. Therefore, the clearance can be measured non-contact without bringing measuring instruments or other devices into contact with the piston and cylinder. Consequently, the clearance between the cylinder and piston can be measured accurately without causing scratches on the surface of the parts during clearance inspection, thus preventing a decrease in compression performance. In this way, a high-quality rotary compressor with high performance can be provided. Furthermore, since the inspection device can be constructed using a measuring instrument for measuring the gas flow rate and a control unit for making judgments, it is possible to design a device with a simple configuration.

[0059] Furthermore, this method allows for measurement in a single step, rather than requiring at least two measurements, such as measuring the distance between the outer surface of the shaft and the inner surface of the cylinder, and the distance between the outer surface of the shaft and the outer surface of the piston, and then calculating the clearance from the difference between these two distances. This improves the productivity of the compressor. Furthermore, since the clearance can be measured before housing the compression mechanism inside the pressure tank, it is possible to replace or adjust the compression mechanism if its clearance falls outside the specified range before housing it inside the pressure tank, thereby reducing work losses in the product assembly process.

[0060] Furthermore, in the manufacturing method of the rotary compressor of this embodiment configured as described above, The system includes a database creation step, in which the size of the clearance between the inner circumferential surface of the cylinder and the piston is changed, and the flow passage step and the measurement step are performed for each size of the clearance to create a database that records the relationship between the change in the amount of change in the flow rate and the change in the size of the clearance. It is.

[0061] In this way, by having a database that records the relationship between changes in clearance size and changes in factory air flow rate, the clearance can be measured accurately and quickly during the manufacturing of the rotary compressor.

[0062] The following describes the case where the control unit 75 estimates the size of clearance G1 using AI (Artificial Intelligence). Figure 8 is a block diagram showing the configuration of the learning unit 76A included in the control unit 75. The learning unit 76A comprises a data acquisition unit 76A1, a model generation / inference unit 76A2, and a trained model storage unit 77A.

[0063] In the preparation process, the flow rate V of the factory air flowing through the intake port 1IN (input 1) and the size of the clearance G1 corresponding to this flow rate V (input 2: correct answer) are input to the data acquisition unit 76A1 as learning data. The model generation / inference unit 76A2 generates a trained model, which is a database DB for inferring the optimal output, based on the combination of the factory air flow rate V (input 1) and the clearance G1 size (input 2: ground truth) input from the data acquisition unit 76A1. The generated trained model is recorded in the trained model storage unit 77A.

[0064] In the inspection process, the model generation / inference unit 76A2 infers the output obtained using this trained model. Specifically, the model generation / inference unit 76A2 takes the flow rate V of the factory air flowing through the detected intake port 1IN as input to this trained model and outputs a clearance G1 inferred from the flow rate V. The control unit 75 then determines whether the magnitude of the clearance G1 estimated by the model generation / inference unit 76A2 exceeds the threshold range X1.

[0065] Furthermore, in the preparation step, the model generation / inference unit 76A2 may train the learned model to understand the relationship between the change in flow rate V and the change in the angle of the inclination of the piston 2's axis with respect to the inner circumferential surface 1S of the cylinder 1. Then, in the inspection step, the model generation / inference unit 76A2 may infer the inclination of the piston 2's axis based on this learned model and the measured flow rate V.

[0066] The configuration of the hardware of the control unit 75 will be described below. Figure 9 shows an example of the hardware configuration of the control unit 75 included in the rotary compressor inspection device. The control unit 75, acting as a control device, is configured to include a processor 76 and a storage device 77, as shown in Figure 9 as an example of its hardware. The storage device 77 includes a volatile storage device such as random access memory (not shown) and a non-volatile auxiliary storage device such as flash memory. Alternatively, a hard disk may be provided as an auxiliary storage device instead of flash memory. The processor 76 executes the program input from the storage device 77. In this case, the program is input from the auxiliary storage device to the processor 76 via the volatile storage device. The processor 76 may also output data such as calculation results to the volatile storage device of the storage device 77, or it may save the data to the auxiliary storage device via the volatile storage device.

[0067] Embodiment 2. Hereinafter, Embodiment 2 of this disclosure will be described with reference to the figures, focusing on the differences from Embodiment 1 described above. Parts similar to those in Embodiment 1 are denoted by the same reference numerals and their description is omitted. Figure 10 shows a schematic configuration of the rotary compressor inspection device 270 according to Embodiment 1 and the compression mechanism 50 to be inspected. The inspection device 270 of this embodiment is further equipped with a workpiece holding section 274A and a phase-setting mechanism section 274B as holding sections, compared to the inspection device 70 shown in Figure 1.

[0068] The workpiece holding section 274A holds the compression mechanism 50 to prevent misalignment of the compression mechanism 50 being inspected. Furthermore, when attempting to measure the clearance G1, setting the compression mechanism 50 on the workpiece holding section 274A makes it easier to seal in air. The phase-setting mechanism 274B is connected to the shaft 20 and holds the shaft 20, and holds the piston 2 of the compression mechanism 50 in a set phase within the cylinder 1.

[0069] The phase-setting mechanism 274B is a mechanism for determining the phase of the shaft 20 relative to the cylinder 1 when measuring the clearance G1. As shown in Figure 3, the crank 20A and piston 2 fitted to the shaft 20 are eccentric with respect to the center of the cylinder 1. If the phase of the shaft 20 changes, the value of the clearance G1 also changes. Since the phase of the shaft 20 is one of the important factors during measurement, the phase setting by the phase-setting mechanism 274B requires high precision. Specifically, an precision of ±0.5 degrees or more is appropriate.

[0070] In this case, during the database creation process of the preparation step, the piston 2 is positioned at multiple phases within the cylinder 1, and a flow process and a measurement process are performed for each phase. The relationship between the flow rate V and clearance G1 for each phase is then recorded in the database. Thus, the control unit 75 has pre-recorded in a database the relationship between the change in the amount of change in flow rate V and the change in the size of clearance G1 at a set phase, enabling accurate determination of the size of clearance G1. Furthermore, since clearance measurements can be performed with each component constituting the compression mechanism 50 in a positioned state, measurement errors are expected to be reduced, contributing to improved measurement accuracy.

[0071] In Figure 4, the entire compression mechanism 50 is held within the inspection device by placing the cylinder 1 on the workpiece holding part 274A. However, the shape of the workpiece holding part 274A is not limited to this; it is sufficient if the compression mechanism 50 can be held in a set position within the inspection device during clearance measurement.

[0072] In the rotary compressor inspection device of this embodiment configured as described above, A retaining part for holding the piston at a set phase position within the cylinder is connected to the rotating shaft, The control unit, The relationship between the change in the amount of change in the flow rate and the change in the size of the clearance in each of the aforementioned phases is recorded in advance in a database. Based on the measured flow rate and the database, it is determined whether the clearance size exceeds the threshold range. It is.

[0073] In this configuration, by connecting a retaining part that holds the piston at a set phase position within the cylinder to the rotating shaft, the flow rate is less likely to change during measurement in response to changes in the shaft's phase, thus enabling accurate measurement of the clearance value. In this embodiment as well, the control unit may perform control using machine learning with AI. Specifically, the learning unit of the control unit generates a trained model that learns the relationship between the change in flow rate and the change in clearance size in each phase, and records it as a database. The control unit may then infer the clearance size based on the trained model and the measured flow rate, and determine whether the inferred clearance exceeds a threshold range.

[0074] Embodiment 3. Hereinafter, Embodiment 3 of this disclosure will be described with reference to the figures, focusing on the differences from Embodiment 1 described above. Parts similar to those in Embodiment 3 are denoted by the same reference numerals and their description is omitted. Figure 11 shows a schematic configuration of the rotary compressor inspection device 370 according to Embodiment 3 and the compression mechanism 350 to be inspected. Figure 12 is a magnified longitudinal cross-sectional view showing the main part of the compression mechanism 350, which is mounted inside the rotary compressor of this embodiment 3. Figure 13 shows the configuration of the database DB recorded by the control unit of the inspection device 370 in this embodiment 3.

[0075] Rotary compressors include twin rotary compressors, which have two cylinders and two pistons on a single shaft 20. Twin rotary compressors can be configured with an intake port 1IN and a discharge port 1OUT for each cylinder 1, or with a discharge port 1OUT for each cylinder 1, but with an intake port 1IN on only one cylinder 1. For convenience, the latter is called a one-pass twin rotary compressor.

[0076] The compression mechanism 350 of this embodiment constitutes a one-pass twin rotary compressor and, as shown in Figure 12, is equipped with two cylinders 1 in the axial direction Y. Each cylinder 1 is provided with a piston 2 with a different eccentric direction. Intake port 1IN is provided only on cylinder 1 located below in the axial direction Y. Intake port 1IN is provided with a branching section 1P that divides its flow path, and refrigerant is supplied via this branching section 1P to cylinder 1 located above in the axial direction Y that does not have an intake port 1IN.

[0077] When attempting to inspect such a compression mechanism 350 constituting a one-pass twin rotary compressor by injecting factory air into the compression chamber CO using a supply unit 71, as shown in Embodiment 1, it may be impossible to estimate the clearance G1 because it is unclear which cylinder 1 the supplied factory air flowed into. While it is not impossible to block the branching section 1P so that factory air flows only to one cylinder 1, this would complicate the structure, require space to seal the branching section 1P, and may result in a larger compressor. Therefore, the following method is proposed.

[0078] As shown in Figure 11, the rotary compressor inspection device 370 according to this third embodiment has a rotating device 360 ​​attached to the shaft 20. By rotating the shaft 20 with this rotating device 360, a compression operation occurs in the compression chamber CO, and factory air is drawn in from the intake port 1IN. The control unit 75 measures the flow rate V of the factory air passing through the intake port 1IN, which is the amount of air drawn in, using a measuring instrument 72, and estimates the clearance G1.

[0079] As a method for estimating the clearance G1 from the intake flow rate V of factory air, similar to Embodiment 1, this can be achieved by providing a database DB as shown in Figure 13 and setting a threshold range X2 for the flow rate V. The flow rate V may be determined by the change in the flow rate V per unit time over time, or by the cumulative flow rate obtained by accumulating the flow rate V per unit time. Generally, determining the clearance G1 based on the cumulative flow rate yields higher accuracy, but it is not possible to determine the size of the clearance G1 in each individual cylinder 1. On the other hand, by checking the change in flow rate V over time, for example, by correlating the phase of piston 2 with the change in flow rate V when factory air is drawn in, and recording this data in a database using machine learning, it is possible to estimate whether the clearance G1 is large or small in each cylinder 1.

[0080] However, in the case of a one-pass twin-scroll compressor, determining how much air is drawn into each cylinder 1 can be difficult depending on the response speed of the measuring instrument 72. Nevertheless, even in such cases, rotating the shaft 20 in the rotating device 360 ​​is the operation of the compressor itself and is very close to the actual operating conditions. Therefore, if there is a problem with the average clearance G1 of the two cylinders 1 or other parts, it will appear as the amount of factory air drawn in, so even if the individual clearance G1 is unknown, the performance of the compression mechanism 350 can be evaluated, so there is no problem.

[0081] The database DB of this embodiment, shown in Figure 13, shows a correlation between the change in the size of clearance G1 and the change in the cumulative flow rate of factory air. It has been shown that a smaller clearance G1 results in a larger intake volume of factory air. The control unit 75 determines whether the cumulative flow rate, which is the flow rate V per unit time passing through the intake port 1IN, which is the measured intake flow rate of factory air, exceeds the flow rate V defined by the threshold range X2, and determines the size of the clearance G1.

[0082] Furthermore, in the database DB of this embodiment, as in the database DB of Embodiment 1, a first B reference value Vo' is set, which is the flow rate corresponding to the threshold Ro', the lower limit of the threshold range X2. This is because if the clearance G1 is too small and falls below the threshold Ro', it is conceivable that the intake volume of factory air will be large, but the rotation of the piston 2 will become heavy. In such cases, a higher quality compressor can be achieved by using this in conjunction with inspections such as measuring the rotational torque or applying a vibration pickup to the cylinder 1 and shaft 20 to acquire vibrations.

[0083] In this embodiment, we have shown an example of determining the clearance G1 using the amount of factory air drawn in by rotating the piston 2 in order to inspect a compressor with a one-pass twin rotary configuration. However, this method of determining clearance using the amount of factory air drawn in can also be similarly applied to the inspection of a single rotary compressor having a set of cylinders 1 and pistons 2, as shown in Embodiment 1. In this embodiment as well, the control unit may perform clearance G1 determination control using machine learning with AI.

[0084] While this disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but can be applied individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are conceivable within the scope of the technology disclosed herein. These include, for example, modifying, adding or omitting at least one component, or even extracting at least one component and combining it with components of other embodiments.

[0085] The various aspects of this disclosure are summarized below as an appendix. (Note 1) A cylinder in which a space that serves as a compression chamber is formed inside, A cylindrical piston is fitted onto a rotating shaft inserted into the aforementioned space, and rotates eccentrically within the space along the inner circumferential surface of the cylinder as the rotating shaft rotates, thereby constituting the compression chamber. A rotary compressor inspection device for inspecting a rotary compressor comprising vanes supported so as to be able to move back and forth in the radial direction of the compression chamber in accordance with the eccentric rotation of the piston, A measuring instrument for measuring the flow rate per unit time of gas flowing through an intake port that connects the compression chamber provided in the cylinder with the outside of the cylinder, A control unit that determines whether the clearance between the outer surface of the piston and the inner surface of the cylinder exceeds a set threshold range based on the measured flow rate, Equipped with, Inspection device for rotary compressors. (Note 2) The control unit, The relationship between the change in the amount of flow rate and the change in the size of the clearance is recorded in a database beforehand. Based on the measured flow rate and the database, it is determined whether the clearance size exceeds the threshold range. Inspection device for the rotary compressor described in Appendix 1. (Note 3) The control unit, The relationship between the change in the flow rate and the change in the angle of inclination of the piston axis with respect to the inner surface of the compression chamber is recorded in the database beforehand. Based on the measured flow rate and the database, the tilt of the piston is detected. Inspection device for the rotary compressor described in Appendix 2. (Note 4) The control unit, The system includes a learning unit that generates a trained model that learns the relationship between the change in the amount of flow rate and the change in the size of the clearance, and records it as a database. Based on the trained model and the measured flow rate, the magnitude of the clearance is inferred, and it is determined whether the inferred clearance exceeds the threshold range. Inspection device for rotary compressors as described in Appendix 2 or Appendix 3. (Note 5) The control unit, The relationship between the change in the flow rate and the change in the angle of inclination of the piston axis with respect to the inner surface of the compression chamber is taught to the trained model. Based on the trained model and the measured flow rate, the tilt of the piston is inferred. Inspection device for the rotary compressor described in Appendix 4. (Note 6) An inspection device for a rotary compressor, comprising a plurality of cylinders arranged in the axial direction, with each cylinder equipped with a piston having a different eccentric direction, The control unit, The relationship between the phase of the piston in each cylinder and the flow rate is recorded in the database, and the cylinder with the larger clearance among the plurality of cylinders is identified. An inspection device for a rotary compressor as described in any one of the appendices 2 through 5. (Note 7) The device includes a gas injector into the aforementioned intake port. The supply device adjusts the pressure of the gas injected into the compression chamber to a set pressure value. The measuring instrument measures the flow rate per unit time of the gas injected by the supply and flowing through the intake port. An inspection device for a rotary compressor as described in any one of the items from Appendix 2 to Appendix 6. (Note 8) The supply device comprises a first regulator for reducing the pressure of the gas outside the cylinder, and a second regulator for further reducing the pressure of the gas reduced by the first regulator and injecting it into the compression chamber, thereby adjusting the pressure of the gas injected into the compression chamber of the cylinder to be below a set pressure value. Inspection device for the rotary compressor as described in Appendix 7. (Note 9) If the flow rate corresponding to the upper limit of the threshold range is defined as the 1A reference value, The control unit, A second reference value is set that is greater than the first reference value by the set reference flow rate. If the measured flow rate exceeds the second reference value, it is determined that the rotary compressor is poorly assembled. An inspection device for a rotary compressor as described in any one of the appendices 1 through 8. (Note 10) The control unit, The flow rate between the first reference value A, which is the flow rate corresponding to the upper limit of the threshold range, and the first reference value B, which is the flow rate corresponding to the lower limit of the threshold range, is derived by linear approximation. Based on the measured flow rate, the size of the clearance between the outer surface of the piston and the inner surface of the cylinder within the threshold range is estimated. An inspection device for a rotary compressor as described in any one of the appendices 1 through 9. (Note 11) A retaining part for holding the piston at a set phase position within the cylinder is connected to the rotating shaft, The control unit, The relationship between the change in the amount of change in the flow rate and the change in the size of the clearance in each of the aforementioned phases is recorded in advance in a database. Based on the measured flow rate and the database, it is determined whether the clearance size exceeds the threshold range. An inspection device for a rotary compressor as described in any one of the appendices 1 through 10. (Note 12) A rotary compressor manufactured using the rotary compressor inspection device described in any one of the items from Appendix 1 to Appendix 11. (Note 13) A cylinder in which a space that serves as a compression chamber is formed inside, A cylindrical piston is fitted onto a rotating shaft inserted into the aforementioned space, and rotates eccentrically within the space along the inner circumferential surface of the cylinder as the rotating shaft rotates, thereby constituting the compression chamber. A method for manufacturing a rotary compressor, comprising: a vane supported so as to be able to move back and forth in the radial direction of the compression chamber in accordance with the eccentric rotation of the piston; A flow process in which gas is passed through an intake port that connects the compression chamber provided in the cylinder with the outside of the cylinder, A measurement step of measuring the flow rate per unit time of the gas flowing through the aforementioned intake port, A determination step of determining whether the clearance between the inner surface of the cylinder and the piston exceeds a set threshold based on the measured flow rate, The system includes a centering step, which involves centering the piston when the flow rate exceeds the threshold range. A method for manufacturing a rotary compressor. (Note 14) The aforementioned flow passage process is, The piston is rotated eccentrically by the aforementioned rotating shaft, and gas is drawn into the compression chamber from outside the compression chamber through the intake port, thereby causing gas to flow through the intake port. The method for manufacturing a rotary compressor as described in Appendix 13. (Note 15) The system includes a database creation step, in which the size of the clearance between the inner circumferential surface of the cylinder and the piston is changed, and the flow passage step and the measurement step are performed for each size of the clearance to create a database that records the relationship between the change in the amount of change in the flow rate and the change in the size of the clearance. A method for manufacturing a rotary compressor as described in Appendix 13 or Appendix 14. (Note 16) In the aforementioned database creation process, The piston is positioned in multiple phases within the cylinder, and the flow passage process and the measurement process are performed for each phase, and the relationship between the change in the amount of flow rate and the change in the clearance size for each phase is recorded in the database. The method for manufacturing a rotary compressor as described in Appendix 15. (Note 17) The intake port is provided in one of the first compression chambers, which is partitioned by the vane, and the cylinder on the other, second compression chamber side has a discharge port that connects the second compression chamber to the outside of the cylinder. The flow passage process and the measurement process are carried out with the discharge port closed. A method for manufacturing a rotary compressor as described in any one of the appendices 13 to 16. [Explanation of Symbols]

[0086] 1 Cylinder, 1IN Inlet, 1OUT Outlet, 1P Branch Section, 2 Pistons, 5 Vanes, 20 Shaft (Rotating Axis), 70, 70A, 270, 370 Rotary Compressor Inspection Device, 71 Feeder, 71A First Regulator, 71B Second Regulator, 72 Measuring Instrument, 75 Control Unit, 100 Rotary Compressor, CO Compression Chamber, DB Database.

Claims

1. A cylinder in which a space that serves as a compression chamber is formed inside, A cylindrical piston is fitted onto a rotating shaft inserted into the aforementioned space, and rotates eccentrically within the space along the inner circumferential surface of the cylinder as the rotating shaft rotates, thereby constituting the compression chamber. A rotary compressor inspection device for inspecting a rotary compressor comprising vanes supported so as to be able to move back and forth in the radial direction of the compression chamber in accordance with the eccentric rotation of the piston, A measuring instrument for measuring the flow rate per unit time of gas flowing through an intake port that connects the compression chamber provided in the cylinder with the outside of the cylinder, A control unit that determines whether the clearance between the outer surface of the piston and the inner surface of the cylinder exceeds a set threshold range based on the measured flow rate, Equipped with, Inspection device for rotary compressors.

2. The control unit, The relationship between the change in the amount of flow rate and the change in the size of the clearance is recorded in a database beforehand. Based on the measured flow rate and the database, it is determined whether the clearance size exceeds the threshold range. The inspection device for a rotary compressor according to claim 1.

3. The control unit, The relationship between the change in the flow rate and the change in the angle of inclination of the piston axis with respect to the inner surface of the compression chamber is recorded in the database beforehand. Based on the measured flow rate and the database, the tilt of the piston is detected. The inspection apparatus for a rotary compressor according to claim 2.

4. The control unit, The system includes a learning unit that generates and records a trained model that learns the relationship between the change in the amount of flow rate and the change in the size of the clearance, Based on the trained model and the measured flow rate, the magnitude of the clearance is inferred, and it is determined whether the inferred clearance exceeds the threshold range. The inspection device for a rotary compressor according to claim 1.

5. The control unit, The relationship between the change in the flow rate and the change in the angle of inclination of the piston axis with respect to the inner surface of the compression chamber is taught to the trained model. Based on the trained model and the measured flow rate, the tilt of the piston is inferred. The inspection device for a rotary compressor according to claim 4.

6. An inspection device for a rotary compressor, comprising a plurality of cylinders arranged in the axial direction, with each cylinder equipped with a piston having a different eccentric direction, The control unit, The relationship between the phase of the piston in each cylinder and the flow rate is recorded in a database, and the cylinder with the largest clearance among the multiple cylinders is identified. The inspection device for a rotary compressor according to claim 1.

7. The device includes a gas injector into the aforementioned intake port. The supply device adjusts the pressure of the gas injected into the compression chamber to a set pressure value. The measuring instrument measures the flow rate per unit time of the gas injected by the supply and flowing through the intake port. The inspection device for a rotary compressor according to claim 1.

8. The supply device comprises a first regulator that reduces the pressure of the gas outside the cylinder, and a second regulator that further reduces the pressure of the gas reduced by the first regulator and injects it into the compression chamber, thereby adjusting the pressure of the gas injected into the compression chamber of the cylinder to be below a set pressure value. The inspection device for a rotary compressor according to claim 7.

9. If the flow rate corresponding to the upper limit of the threshold range is defined as the 1A reference value, The control unit, A second reference value is set that is greater than the first reference value A by the set reference flow rate. If the measured flow rate exceeds the second reference value, it is determined that the rotary compressor is poorly assembled. The inspection device for a rotary compressor according to claim 1.

10. The control unit, The flow rate between the first reference value A, which is the flow rate corresponding to the upper limit of the threshold range, and the first reference value B, which is the flow rate corresponding to the lower limit of the threshold range, is derived by linear approximation. Based on the measured flow rate, the size of the clearance between the outer surface of the piston and the inner surface of the cylinder within the threshold range is estimated. The inspection device for a rotary compressor according to claim 1.

11. A retaining part for holding the piston at a set phase position within the cylinder is connected to the rotating shaft, The control unit, The relationship between the change in the amount of change in the flow rate and the change in the size of the clearance in each of the aforementioned phases is recorded in advance in a database. Based on the measured flow rate and the database, it is determined whether the clearance size exceeds the threshold range. The inspection device for a rotary compressor according to claim 1.

12. A rotary compressor manufactured using the rotary compressor inspection apparatus described in any one of claims 1 to 11.

13. A cylinder in which a space that serves as a compression chamber is formed inside, A cylindrical piston is fitted onto a rotating shaft inserted into the aforementioned space, and rotates eccentrically within the space along the inner circumferential surface of the cylinder as the rotating shaft rotates, thereby constituting the compression chamber. A method for manufacturing a rotary compressor, comprising: a vane supported so as to be able to move back and forth in the radial direction of the compression chamber in accordance with the eccentric rotation of the piston; A flow process in which gas is passed through an intake port that connects the compression chamber provided in the cylinder with the outside of the cylinder, A measurement step of measuring the flow rate per unit time of the gas flowing through the aforementioned intake port, The system includes a determination step of determining whether the clearance between the inner surface of the cylinder and the piston exceeds a set threshold range based on the measured flow rate. A method for manufacturing a rotary compressor.

14. The invention further comprises a self-alignment step for aligning the piston when the flow rate exceeds the threshold range. A method for manufacturing a rotary compressor according to claim 13.

15. The aforementioned flow passage process is, The piston is rotated eccentrically by the aforementioned rotating shaft, and gas is drawn into the compression chamber from outside the compression chamber through the intake port, thereby causing gas to flow through the intake port. A method for manufacturing a rotary compressor according to claim 13.

16. The system includes a database creation step, in which the size of the clearance between the inner circumferential surface of the cylinder and the piston is changed, and the flow passage step and the measurement step are performed for each size of the clearance to create a database that records the relationship between the change in the amount of change in the flow rate and the change in the size of the clearance. A method for manufacturing a rotary compressor according to claim 13.

17. In the aforementioned database creation process, The piston is positioned in multiple phases within the cylinder, and the flow passage process and the measurement process are performed for each phase, and the relationship between the change in the amount of flow rate and the change in the clearance size for each phase is recorded in the database. A method for manufacturing a rotary compressor according to claim 16.

18. A trained model is generated that learns the relationship between the change in the amount of flow rate and the change in the size of the clearance, Based on the trained model and the measured flow rate, the magnitude of the clearance is inferred, and it is determined whether the inferred clearance exceeds the threshold range. A method for manufacturing a rotary compressor according to claim 13.

19. The intake port is provided in one of the first compression chambers, which is partitioned by the vane, and the cylinder on the other, second compression chamber side has a discharge port formed that connects the second compression chamber to the outside of the cylinder. The flow passage process and the measurement process are carried out with the discharge port closed. A method for manufacturing a rotary compressor according to any one of claims 13 to 18.

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