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

Inspection device for rotary compressor, rotary compressor, and method for manufacturing rotary compressor

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

[0002] Conventionally, when manufacturing a rotary compressor, each component, such as a hollow cylinder having a space inside that serves as a compression chamber, a crankshaft serving as a rotating shaft, a piston fitted around the crankshaft for eccentric rotation, and a crankshaft bearing, is machined with high precision. These components are then fastened together with bolts to form a compression mechanism that functions as a compression chamber within the cylinder. To efficiently compress the refrigerant sealed in the compression chamber continuously, it is necessary to maintain the clearance between the cylinder and the piston at a set value or less. Therefore, the following method for measuring the clearance between the cylinder and the piston in a rotary compressor has been disclosed, which measures the clearance with high precision during assembly of the compression mechanism.

[0003] That is, in a conventional method for measuring the clearance between the cylinder and rolling piston in a rotary compressor, a measuring probe is placed on one point on the circumferential surface of the rotating shaft and one point on the inner circumferential wall of the cylinder to measure the distance between them. Similarly, the maximum distance between one point on the circumferential surface of the rotating shaft and one point on the outer periphery of the roller is measured. The clearance is measured by taking the difference between these two distances (see, for example, Patent Document 1).

[0004] Japanese Patent Application Publication No. 59-24205

[0005] However, with the conventional measurement method described above, the measuring probe must be brought into contact with each of the cylinder and piston components, which raises the risk of damaging the component surfaces during measurement, potentially leading to a decline in the compressor's quality, such as its compression performance.

[0006] The present disclosure discloses a technique for solving the above-described problems, and aims to provide an inspection device for a rotary compressor that can accurately measure the clearance between a cylinder and a piston without causing a decrease in compression performance, a rotary compressor that ensures high performance, and a method for manufacturing a rotary compressor that can manufacture a rotary compressor that ensures high performance.

[0007] The present disclosure provides an inspection device for a rotary compressor for inspecting a rotary compressor including: a cylinder having a space formed therein to serve as a compression chamber; a cylindrical piston fitted to a rotating shaft inserted into the space and eccentrically rotating within the space along the inner circumferential surface of the cylinder as the rotating shaft rotates, thereby forming the compression chamber; and a vane supported so as to be able to advance and retreat radially of the compression chamber as the piston eccentrically rotates, the inspection device comprising: a measuring device that measures the flow rate per unit time of gas flowing through an intake port provided in the cylinder that communicates the compression chamber with the outside of the cylinder; and a control unit that determines, based on the measured flow rate, whether the size of the clearance between the outer circumferential surface of the piston and the inner circumferential surface of the cylinder exceeds a set threshold range. The present disclosure also provides a rotary compressor manufactured using the inspection device for a rotary compressor configured as described above. a cylindrical piston fitted to a rotary shaft inserted into the space and rotating eccentrically within the space along the inner circumferential surface of the cylinder as the rotary shaft rotates, thereby constituting the compression chamber; and a vane supported so as to be able to advance and retreat radially of the compression chamber as the piston rotates eccentrically, the method comprising the steps of: a flowing step of flowing gas through an intake port provided in the cylinder, the intake port communicating the compression chamber with the outside of the cylinder; a measuring step of measuring a flow rate per unit time of the gas flowing through the intake port; a determining step of determining, based on the measured flow rate, whether or not the size of the clearance between the inner circumferential surface of the cylinder and the piston exceeds a set threshold; and an aligning step of aligning the piston when the flow rate exceeds the threshold range.

[0008] According to the rotary compressor inspection device disclosed in the present disclosure, it is possible to obtain 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 that ensures high performance, and a rotary compressor manufacturing method that can manufacture a rotary compressor that ensures high performance.

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

[0010] Embodiment 1. An inspection device for a rotary compressor, a rotary compressor, and a method for manufacturing a rotary compressor according to this embodiment will be described below with reference to the drawings. Fig. 1 is a diagram showing the schematic configuration of an inspection device 70 for a rotary compressor according to embodiment 1 and a compression mechanism 50 to be inspected. Fig. 2 is a vertical cross-sectional view showing the schematic configuration of a rotary compressor 100 including the compression mechanism 50 shown in Fig. 1. In the following description, the axial direction and radial direction of a compression chamber formed in a cylindrical shape centered on a rotation axis will be referred to as the axial direction Y and the radial direction X, respectively.

[0011] An inspection device 70 for a rotary compressor according to the first embodiment (hereinafter referred to as the inspection device 70) inspects for assembly defects in the manufacturing process of the compression mechanism 50 of a rotary compressor 100 (hereinafter referred to as the compressor 100). First, the configuration of the compressor 100 including the compression mechanism 50 to be inspected will be described.

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

[0013] The compression mechanism 50 is connected to a drive unit 30 serving as an electric motor via a shaft 20, and generates high-pressure refrigerant by compressing a low-pressure refrigerant using the rotational driving force transmitted from the drive unit 30 via the shaft 20. The drive unit 30 is configured to include a rotor 30R and a stator 30S, and is supplied with power via a connector (not shown) to rotate the shaft 20.

[0014] The detailed configuration of the compression mechanism 50 will be described. Fig. 3 is an enlarged longitudinal cross-sectional view showing a main part of the compression mechanism 50 mounted inside the rotary compressor 100 shown in Fig. 2. For convenience of illustration, the compression mechanism 50 is shown upside down in the axial direction Y compared to the compression mechanism 50 shown in Fig. 1. Fig. 4 is a cross-sectional view of the compression mechanism 50 shown in Fig. 3 taken along the line A-A.

[0015] The compression mechanism 50 includes a hollow cylindrical cylinder 1, one end portion of a shaft 20 inserted into the internal space of the cylinder 1, a crank 20A fitted to one end portion of the shaft 20 in the axial direction Y, a piston 2 fitted to the outer peripheral surface of the crank 20A, a frame 4 closing an opening at one end side of the cylinder 1 in the axial direction Y, a head 3 closing an opening at the other end side of the cylinder 1 in the axial direction Y, and a vane 5 dividing the internal space of the cylinder 1.

[0016] As shown in Figure 2, the outer peripheral surface of the cylinder 1 is attached to the inner peripheral 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 crank 20A performs eccentric motion within the space inside the cylinder 1. Thus, the cylindrical piston 2 attached to the outer peripheral surface of this crank 20A rotates eccentrically within the space inside the cylinder 1 along the inner peripheral surface 1S of the cylinder 1 as the shaft 20 rotates.

[0017] As shown in Fig. 4, the cylinder 1 has an intake port 1IN formed to communicate between the interior space of the cylinder 1, which will become a compression chamber CO described later, and the outside of the cylinder 1. This intake port 1IN serves as a flow path for drawing low-pressure refrigerant from the outside of the cylinder 1 into the interior space of the cylinder 1, which will become the compression chamber CO. Furthermore, the cylinder 1 has 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 communicates between the interior space of the cylinder 1 and the outside on that side of the cylinder 1 in the axial direction Y, thereby discharging compressed high-pressure refrigerant to one side of the cylinder 1 in the axial direction Y.

[0018] A groove 1M is provided between the intake port 1IN and the discharge port 1OUT, extending from the inside to the outside in the radial direction X of the cylinder 1 and penetrating in the axial direction Y of the cylinder 1. A vane 5 having the same axial length Y as the length of the cylinder 1 in the axial direction Y is provided in this groove 1M and reciprocating in the radial direction X within this groove 1M. 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 disposed on the radially outer side of the 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 tip end of the vane 5 on the inner side in the radial direction X is pressed against the outer peripheral surface 2S of the piston 2 by the spring 6 while moving back and forth within the groove 1M so as to be constantly in contact with the outer peripheral surface 2S of the piston 2 in response to the rolling of the piston 2.

[0020] Thus, a sealed compression chamber CO is formed by the inner peripheral surface IS of the cylinder 1, one end face of the head 3 in the axial direction Y, the other end face of the frame 4 in the axial direction Y, and the outer peripheral surface 2S of the piston 2. A vane 5 attached between the suction port 1IN and the discharge port 1OUT has its tip abutting against the outer peripheral surface 2S of the piston 2, and divides the compression chamber CO into a first compression chamber CO1, a low-pressure space on the suction 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 is eccentrically rotated within the cylinder 1 by the drive unit 30, and low-pressure refrigerant is drawn into the compression chamber CO through the intake port 1IN. The eccentric rotation of the piston 2 reduces the volume of the compression chamber CO, compressing the refrigerant. When the refrigerant is compressed to a desired pressure or higher, a valve (not shown) provided at the discharge port 1OUT opens, and the compressed high-pressure refrigerant is discharged to the outside of the cylinder 1. The high-pressure refrigerant is sent to the piping of, for example, an outdoor unit of an air conditioner.

[0022] A clearance G1 is provided so that the outer peripheral surface 2S of the piston 2 does not interfere with the inner peripheral surface 1S of the cylinder 1 when the piston 2 eccentrically rotates along the inner peripheral surface 1S of the cylinder 1. To continuously and efficiently compress the refrigerant sealed in the compression chamber CO, the piston 2 must rotate eccentrically while this clearance G1 is always maintained at a certain value or less. For this reason, when assembling the compressor 100 having the above structure, the axis of the shaft 20, which is the rotation center of the piston 2, must be aligned with the center of the cylinder 1, requiring highly accurate alignment work.

[0023] Next, the configuration of an inspection device 70 according to the first embodiment, 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 described in detail with reference to Fig. 1. As shown in Fig. 1, the inspection device 70 includes a supplier 71 that injects factory air as 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 supplier 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 supplier 71 is injected into the compression chamber CO through a supply tube 73 such as a pipe or tube.

[0024] The inspection device 70 of this embodiment detects the clearance G1 by injecting factory air into the suction port 1IN at a stage after the compression mechanism 50 is assembled and before the compressor 100 shown in Fig. 2 is completed. Specifically, the inspection device 70 injects factory air into the suction port 1IN at a stage when the compression chamber CO, which is an enclosed space for compressing the refrigerant, is formed in the interior space of the cylinder 1 and the compression chamber CO is partitioned by the vane 5 into two spaces: a low-pressure space on the suction port 1IN side and a high-pressure space on the discharge port 1OUT side, i.e., at a stage when the cylinder 1, piston 2, head 3, frame 4, and vane 5 are assembled.

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

[0026] Generally, in the compression mechanism of a rotary compressor, the clearance between parts in the axial direction Y (thrust direction) has a greater influence on the amount of refrigerant leakage loss than the clearance in the radial direction X (radial direction). Furthermore, because part tolerances accumulate in the radial direction X, it is necessary to avoid a malfunction in which the piston comes into contact with the cylinder and compression motion stops 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 IS 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 determining the flow rate of injected factory air.

[0027] That is, if the assembly precision of the compression mechanism 50 is high and the clearance G1 is small, the air resistance through the clearance G1 increases, and the amount of factory air injected tends to decrease over time. As a result, the flow rate V, which is the amount of factory air injected per unit time, decreases. Therefore, by measuring the flow rate of factory air injected through the intake port 1IN with the discharge port 1OUT sealed, it is possible to determine whether the clearance G1 is within the specified dimensions.

[0028] A method for manufacturing a rotary compressor using the inspection device 70 of this embodiment will be described below. Fig. 5 is a flow diagram showing the method for manufacturing a rotary compressor using the inspection device 70 of this embodiment. The inspection device 70 includes two steps: a preparation step and an inspection step.

[0029] First, a test compression mechanism having a configuration similar to that of 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 step 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, is 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 device 71 into the compression chamber CO through the intake port 1IN, causing the factory air to flow through the intake port 1IN (step S2). Next, a measurement process is performed in which the flow rate V per unit time of the factory air flowing through the intake port 1IN is measured and recorded using the measuring device 72 (step S3). Next, a process is performed in which it is determined whether the flow rate V has been obtained for the number of different clearances G1 that have been set (step S4). For example, if the clearance G1 is changed in increments of 0.01 mm within a range of 0.03 mm to 0.12 mm, the set number n is 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 the clearance G1, and perform the process up to step S3 to obtain and record the flow rate V.

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

[0033] The created database will now be described. Fig. 6 is a diagram showing the configuration of the database DB recorded by the control unit 75 of the inspection device 70 of this embodiment. The database DB shows the correlation showing the amount of change in the flow rate V of injected factory air relative to changes 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 of this embodiment is provided with a database DB that indicates the correlation between the clearance G1 and the flow rate V, which is recorded in advance in a preparation process. As a result, by injecting factory air into the compression mechanism unit 50 assembled in the manufacturing process of the compressor 100 and measuring the flow rate V, it becomes possible to accurately estimate the size of the clearance G1 in the assembled compression mechanism unit 50.

[0035] Furthermore, the dimensional range in which the clearance G1 is equal to or less than the specified value and is determined to be acceptable is set to be within the dimensional range of the threshold range X1 shown in Fig. 6. As a result, as will be described below, if the flow rate V measured in the inspection process exceeds the first-A reference value Vo, which is the flow rate corresponding to the threshold value Ro, which is the upper limit of the threshold range X1, or if it is below the first-B reference value Vo', which is the flow rate corresponding to the threshold value Ro', which is the lower limit of the threshold range X1, it can be determined that the clearance G1 exceeds the specified dimension.

[0036] However, the threshold range X1, which is the dimensional range determined to be acceptable in FIG. 6 , does not include the dimensional range in which 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 influence of the oil film. Impaired rotation of the piston 2 will result in problems such as increased vibration during operation of the compressor 100 and increased load on the motor. Therefore, a threshold value Ro' is set in advance as the lower limit of the clearance G1, and a first B reference value Vo' of the flow rate corresponding to this threshold value Ro' is derived. By setting and managing the lower limit of the clearance G1 in this way, the operational integrity of the compressor 100 can be ensured.

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

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

[0039] Next, in a flowing step, factory air is injected from the supply device 71 into the compression chamber CO of the compression mechanism 50 to be inspected, with the discharge port 1OUT of the compression mechanism 50 being inspected blocked, and the factory air is passed through the intake port 1IN (step S7). Next, in a measuring step, the flow rate V per unit time of the factory air injected from the supply device 71 is measured and recorded by the measuring device 72 (step S8). Next, in a determining step, it is determined 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 preparation step (step S9).

[0040] If the size of clearance G1 is within the specified dimension within the threshold range X1, the assembled compression mechanism 50 is determined to be acceptable (YES in step S9), and an in-tank accommodation step is performed to accommodate 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 (NO in step S9), an alignment step is performed to align the piston 2 (step S9A). Steps S7 to S9A are then repeated until the size of clearance G1 falls within the threshold range X1.

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

[0042] In this way, 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 part 50 being inspected, the size of the clearance G1 can be inspected with high accuracy without damaging the surface of the parts during measurement.

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

[0044] While the example shows the injection process and the measurement process being performed with the discharge port 1OUT of the compression mechanism 50 being inspected blocked, this is not limiting. Although the behavior of the data in the database DB will differ, the clearance G1 can also be inspected by performing the injection process and the measurement process with the discharge port 1OUT open. While the measurement process is described above as being performed after the injection process, the injection process and the measurement process may be performed in parallel. Furthermore, during the preparation process, a waveform showing the change over time in the factory air flow rate per unit time at a set clearance G1 may be recorded in the database DB, and the clearance G1 may be determined using this waveform during the inspection process.

[0045] 3 is small in thickness in the axial direction Y and the inter-component clearance in the axial direction Y between the piston 2 and the frame 4 is large, the injected air will leak through the inter-component clearance generated on both ends of the vane 5 in the groove 1M in the axial direction Y. Therefore, it is desirable that the inspection device 70 also include a mechanism for sealing the groove 1M of the cylinder 1 to prevent factory air from leaking out from the groove 1M.

[0046] The following describes an inspection device 70 that uses a database DB with a different configuration from the database DB described above. In a preparatory process for creating the database DB, the relationship between the change in flow rate V and the change in the angle of inclination of the axis of the piston 2 relative to the inner circumferential surface 1S of the cylinder 1 is recorded in advance in the database DB. With this configuration, if the crank 20A and shaft 20 integrated with the piston 2 are assembled at an angle relative to the cylinder 1, this inclination can be detected in the inspection process. This is because the inclination of the piston 2 creates areas of high localized air resistance in the factory air flow path, and the flow rate V changes depending on the change in the angle of inclination of the piston 2 and shaft 20.

[0047] The following describes an inspection device 70 that uses a database DB with a different configuration from the database DB described above. By using this database DB, the inspection device 70 can detect abnormalities other than deviations in the clearance G1 dimension, as described below. In the advance preparation process for creating the database DB, in addition to the first reference value Vo described above, a second reference value Vn as shown in FIG. 6 is further set as a reference for detecting installation abnormalities for 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 a sufficiently large value that is greater than the reference flow rate set for the first reference value Vo.

[0048] As described above, the flow rate V measured at intake port 1IN is predominantly determined by clearance G1. Therefore, when clearance G1 is near threshold value Ro, changes in the measured flow rate can be considered to correspond to variations in clearance G1. However, when the measured flow rate V significantly exceeds the first reference value Vo, which is the dimensional reference value for clearance G1, and becomes equal to or greater than the second reference value Vn, it is considered that an abnormality other than a deviation in the clearance G1 dimension, i.e., a misalignment of the piston 2, has occurred. Specifically, a significant increase in the flow rate V of factory air into intake port 1IN is caused by a deviation in the dimension of a location other than clearance G1, and this deviation is thought to be due to improper installation of the piston 2 or vane 5 that occurred during assembly of the compression mechanism 50.

[0049] Therefore, by providing and setting a new measurement standard, a second reference value Vn that is sufficiently larger than the first reference value Vo, it becomes possible to not only determine the clearance G1 but also detect improper installation of other components using the same inspection system using the same inspection device. This eliminates the need for a separate inspection process, resulting in a highly productive manufacturing process.

[0050] Below, we will explain an inspection device 70 that uses a supplier 71 with a different configuration from the supplier 71 described above. The supplier 71 that injects factory air into the compression chamber CO may have a function to adjust the pressure of the factory air to a set pressure value or lower. By injecting factory air at a low pressure, the following three effects can be expected. Here, low pressure refers to a pressure of approximately 0.1 MPa or lower.

[0051] If the oil film adhering near the sealed space inside the cylinder 1 that compresses the refrigerant bursts, air will leak from small gaps other than the clearance G1, specifically the clearance between the inner wall of the groove 1M in the cylinder 1 and the vane 5 in Fig. 3, and the clearance between the frame 4 and the piston 2 in Fig. 3, which can cause an error in the flow rate V. However, if the factory air is injected at a low pressure, there is less risk of the oil film bursting, making it possible to measure with higher accuracy.

[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, while the spring 6 pushes the vane 5 into the cylinder 1, causing the vane 5 to float outward in the radial direction X within the groove 1M. In this case, the volume ratio of the portion related to the clearance G1 to the area inside the cylinder 1 where the factory air circulates decreases, which can lead to a decrease in measurement error. However, if factory air adjusted to a low pressure is used, the force pushing the vane 5 is small, making it less likely to float, and ensuring a measurable area. This enables measurements with small errors.

[0053] Furthermore, similar to the phenomenon with the vane 5 described above, high-pressure factory air increases the load on the frame 4 from the sealed space inside the cylinder 1, causing the frame 4 to float above the cylinder 1. This increases the clearance between the piston 2 and frame 4 in the axial direction Y inside the cylinder 1 in Figure 3, increasing the amount of air leaking from that location and increasing the error in the measured flow rate at the intake port 1IN. Therefore, if low-pressure air is used, the load on the frame 4 is small, making it less likely to float, and allowing for highly accurate measurements.

[0054] In order to adjust the pressure of the factory air with higher precision, an inspection device 70A having the following configuration may be used. Fig. 7 is a diagram showing the general configuration of an inspection device 70A for another rotary compressor according to the first embodiment and the compression mechanism 50 to be inspected. The inspection device 70A of this embodiment includes, as a supply device for injecting factory air into the compression chamber CO, a first regulator 71A that decompresses the factory air, and a second regulator 71B that further decompresses the gas decompressed by the first regulator 71A and supplies it into the compression chamber CO.

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

[0056] For the sake of explanation, the gas injected by the supply device 71 is factory air, but the type of gas to be injected is not limited.

[0057] The rotary compressor inspection device of the present embodiment configured as described above is an inspection device for a rotary compressor that inspects a rotary compressor including: a cylinder having a space formed therein that serves as a compression chamber; a cylindrical piston that is fitted onto a rotating shaft that is inserted into the space and that eccentrically rotates within the space along the inner peripheral surface of the cylinder as the rotating shaft rotates, thereby forming the compression chamber; and a vane that is supported so as to be able to move forward and backward radially of the compression chamber as the piston rotates eccentrically, the inspection device comprising: a measuring instrument that measures the flow rate per unit time of gas flowing through an intake port that is provided in the cylinder and that communicates the compression chamber with the outside of the cylinder; and a control unit that determines, based on the measured flow rate, whether the size of the clearance between the outer peripheral surface of the piston and the inner peripheral surface of the cylinder exceeds a set threshold range.

[0058] In this way, the rotary compressor inspection device measures the flow rate per unit time of gas flowing through the intake port and determines whether the clearance between the piston and the cylinder exceeds a set threshold range based on the measured gas flow rate. This allows for non-contact measurement of the clearance without bringing a measuring instrument into contact with the piston or cylinder. Therefore, the clearance inspection does not damage the surface of the components, allowing for accurate measurement of the clearance between the cylinder and the piston without reducing compression performance. This allows for the provision of a high-quality rotary compressor with high performance. Furthermore, because the inspection device can be configured with a measuring instrument that measures the gas flow rate and a control unit that performs the determination, the device can be designed with a simple configuration.

[0059] Furthermore, unlike methods that require at least two measurements, such as measuring the gap between the outer circumferential surface of the shaft and the inner circumferential surface of the cylinder and the gap between the outer circumferential surface of the shaft and the outer circumferential surface of the piston and then measuring the clearance based on the difference between these two gap dimensions, this method allows for measurement in one go, thereby improving compressor productivity.Furthermore, because the clearance can be measured before the compression mechanism is installed in the pressure tank, any compression mechanism whose clearance falls outside the specified range can be replaced or adjusted before being installed in the pressure tank, thereby reducing work loss in the product assembly process.

[0060] Furthermore, the method for manufacturing the rotary compressor of this embodiment configured as described above further includes a database creation step of changing the size of the clearance between the inner circumferential surface of the cylinder and the piston, performing the flowing step and the measuring step for each size of the clearance, and creating a database that records the relationship between the change in the size of the clearance and the amount of change in the flow rate.

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

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

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

[0064] In the inspection process, the model generation / inference unit 76A2 infers an output obtained by using this trained model. That is, the model generation / inference unit 76A2 inputs the detected flow rate V of factory air flowing through the intake port 1IN to this trained model, and outputs the 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] In the preparation step, the model generation / inference unit 76A2 may cause the trained model to learn the relationship between the change in the flow rate V and the change in the angle of the inclination of the axis of the piston 2 relative 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 axis of the piston 2 based on the trained model and the measured flow rate V.

[0066] The hardware configuration of the control unit 75 will be described below. FIG. 9 is a diagram showing an example of the hardware configuration of the control unit 75 included in an inspection device for a rotary compressor. The control unit 75 as a control device includes a processor 76 and a storage device 77, as shown in FIG. 9 . The storage device 77 includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory, both not shown. Alternatively, a hard disk auxiliary storage device may be provided instead of the flash memory. The processor 76 executes a program input from the storage device 77. In this case, the program is input to the processor 76 from the auxiliary storage device via the volatile storage device. The processor 76 may output data such as calculation results to the volatile storage device of the storage device 77, or may store the data in the auxiliary storage device via the volatile storage device.

[0067] Embodiment 2. Hereinafter, embodiment 2 of the present disclosure will be described with reference to the drawings, focusing on differences from embodiment 1 above. Portions similar to embodiment 1 above will be assigned the same reference numerals and description thereof will be omitted. Figure 10 is a diagram showing a schematic configuration of an inspection device 270 for a rotary compressor according to embodiment 1 and the compression mechanism unit 50 to be inspected. The inspection device 270 of this embodiment further includes a workpiece holding unit 274A as a holding unit and a phase determination mechanism unit 274B as a holding unit in addition to the inspection device 70 shown in Figure 1.

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

[0069] The phase setting mechanism 274B is a mechanism for setting the phase of the shaft 20 relative to the cylinder 1 when measuring the clearance G1. As shown in FIG. 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. As such, the phase of the shaft 20 is one of the important factors during measurement, so high accuracy is required for the phase setting by the phase setting mechanism 274B. Specifically, an accuracy of ±0.5 degrees or better is appropriate.

[0070] In this case, in the database creation step of the preparation step, the piston 2 is positioned in the cylinder 1 at multiple phases, and the flow process and the measurement process are performed for each phase. The relationship between the flow rate V and the clearance G1 for each phase is then recorded in the database. In this way, the control unit 75 has the relationship between the change in the flow rate V and the change in the size of the clearance G1 for the set phase pre-recorded in the database, making it possible to accurately determine the size of the clearance G1. Furthermore, because the clearance can be measured with each component constituting the compression mechanism 50 positioned, it is expected that measurement errors will be reduced, contributing to improved measurement accuracy.

[0071] In FIG. 4, the entire compression mechanism 50 is held within the inspection device by placing the cylinder 1 on the workpiece holding portion 274A, but the shape of the workpiece holding portion 274A is not limited to this, and it is sufficient if it can hold the compression mechanism 50 at a set position within the inspection device during clearance measurement.

[0072] The rotary compressor inspection device of this embodiment configured as described above includes a holding unit connected to the rotary shaft for holding the piston at a set phase position within the cylinder, and the control unit has a database in which the relationship between a change in the clearance size and a change in the flow rate at each of the phases is recorded in advance, and determines whether the clearance size exceeds the threshold range based on the measured flow rate and the database.

[0073] In this manner, by configuring the holding unit that holds the piston at a set phase position in the cylinder to be connected to the rotating shaft, the flow rate is less likely to change during measurement in response to changes in the shaft phase, allowing for accurate measurement of the clearance value. Note that, even in this embodiment, the control unit may perform control through machine learning using AI. That is, the learning unit included in the control unit generates a trained model that learns the relationship between changes in the clearance size at each phase and changes in the flow rate, and records the model as a database. The control unit may then infer the size of the clearance 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 the present disclosure will be described with reference to the drawings, focusing on differences from embodiment 1 above. Portions similar to those in embodiment 3 above will be assigned the same reference numerals and description thereof will be omitted. FIG. 11 is a diagram showing a schematic configuration of an inspection device 370 for a rotary compressor according to embodiment 3 and a compression mechanism unit 350 to be inspected. FIG. 12 is a vertical cross-sectional view showing an enlarged view of a main portion of the compression mechanism unit 350 mounted inside the rotary compressor of embodiment 3. FIG. 13 is a diagram showing the configuration of a database DB recorded by a control unit of inspection device 370 of embodiment 3.

[0075] Among rotary compressors, there is a twin rotary compressor that has two cylinders 1 and two pistons 2 for one shaft 20. Twin rotary compressors are classified into a configuration in which each cylinder 1 is provided with an inlet port 1IN and a discharge port 1OUT, and a configuration in which each cylinder 1 is provided with a discharge port 1OUT, but only one of the cylinders 1 has an inlet port 1IN. 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 includes two cylinders 1 arranged in the axial direction Y, as shown in Fig. 12. Each cylinder 1 is provided with a piston 2 with a different eccentricity direction. An intake port 1IN is provided only in the cylinder 1 located lower in the axial direction Y. A branch portion 1P that branches the flow path of the intake port 1IN is provided in the intake port 1IN, and refrigerant is supplied via this branch portion 1P to the cylinder 1 located upper 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 using the method of injecting factory air into the compression chamber CO using the supplier 71 as described in the first embodiment, it may be impossible to estimate the clearance G1 because it is not possible to determine which cylinder 1 the supplied factory air has flowed into. While it is possible to block the branch portion 1P and have factory air flow only into one cylinder 1, this would complicate the structure and require space to seal the branch portion 1P, which may result in an increase in the size of the compressor. Therefore, the following method is proposed.

[0078] 11, a rotary compressor inspection device 370 according to the third embodiment has a rotation device 360 ​​attached to the shaft 20. Rotation of the shaft 20 by this rotation device 360 ​​causes compression in the compression chamber CO, resulting in the intake of factory air through the intake port 1IN. The control unit 75 estimates the clearance G1 by measuring the intake amount, i.e., the flow rate V of factory air flowing through the intake port 1IN, using a measuring instrument 72.

[0079] As in the first embodiment, a method for estimating the clearance G1 from the factory air intake flow rate V can be achieved by providing a database DB as shown in FIG. 13 and setting a threshold range X2 for the flow rate V. The flow rate V may be determined based on the change in the flow rate V per unit time over time, or may be determined based on an integrated flow rate obtained by integrating the flow rate V per unit time. While determining the flow rate V based on the integrated flow rate generally provides higher accuracy, it is not possible to determine the size of the clearance G1 in each cylinder 1. On the other hand, by checking the change in the flow rate V over time, for example, by performing machine learning to correlate the phase of the piston 2 with the change in the flow rate V when factory air is taken in and recording the data in a database, it is possible to estimate which cylinder 1 has a larger or smaller clearance G1.

[0080] However, in the case of a one-pass twin-scroll compressor, it may be difficult to determine how much air has been drawn into each cylinder 1, depending on the response speed of the measuring instrument 72. However, even in such cases, rotating the shaft 20 on 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 components, it will appear as the amount of factory air drawn in, so there is no problem because the performance of the compression mechanism 350 can be evaluated even if the individual clearances G1 are unknown.

[0081] 13 shows a correlation between the change in the integrated factory air flow rate and the change in the size of the clearance G1. It shows that the smaller the clearance G1, the greater the amount of factory air intake. The control unit 75 determines whether the integrated flow rate, calculated by integrating the flow rate V per unit time 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] As with the database DB of the first embodiment, the database DB of this embodiment also has a first B reference value Vo' set therein, which is a flow rate corresponding to the threshold Ro', which is the lower limit of the threshold range X2. This is because, if the clearance G1 is below the threshold Ro' and is too small, the amount of factory air taken in may be large, but the rotation of the piston 2 may become heavy. In such a case, a compressor of higher quality can be realized by combining this with an inspection 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, an example has been shown in which the clearance G1 is determined using the amount of factory air suctioned by rotating the piston 2 in order to inspect a compressor with a one-pass twin rotary configuration, but this method of determination using the amount of factory air suctioned can also be applied to the inspection of a single rotary compressor having a set of cylinder 1 and piston 2, as shown in embodiment 1. Also, in this embodiment, the control unit may perform determination control of the clearance G1 by machine learning using AI.

[0084] Although various exemplary embodiments and examples are described in this disclosure, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are anticipated within the scope of the technology disclosed in this disclosure. For example, this includes cases where at least one component is modified, added, or omitted, or where at least one component is extracted and combined with components of another embodiment.

[0085] Aspects of the present disclosure are described below as appendices. (Appendix 1) An inspection device for inspecting a rotary compressor including: a cylinder having a space formed therein to serve as a compression chamber; a cylindrical piston fitted to a rotating shaft inserted into the space and eccentrically rotating within the space along an inner circumferential surface of the cylinder as the rotating shaft rotates, thereby forming the compression chamber; and a vane supported so as to be able to advance and retreat radially of the compression chamber as the piston eccentrically rotates, the inspection device for a rotary compressor including: a measuring device that measures a flow rate per unit time of gas flowing through an intake port provided in the cylinder, the intake port communicating the compression chamber with the outside of the cylinder; and a control unit that determines, based on the measured flow rate, whether a size of a clearance between an outer circumferential surface of the piston and the inner circumferential surface of the cylinder exceeds a set threshold range. (Supplementary Note 2) The inspection device for a rotary compressor according to Supplementary Note 1, wherein the control unit has a database in which a relationship between a change in the flow rate and a change in the size of the clearance is recorded in advance, and determines whether the size of the clearance exceeds the threshold range based on the measured flow rate and the database. (Supplementary Note 3) The inspection device for a rotary compressor according to Supplementary Note 2, wherein the control unit has a database in which a relationship between a change in the flow rate and a change in an angle of inclination of an axis of the piston with respect to an inner circumferential surface of the compression chamber is recorded in advance, and detects the inclination of the piston based on the measured flow rate and the database. (Supplementary Note 4) The inspection device for a rotary compressor according to Supplementary Note 2 or Supplementary Note 3, wherein the control unit has a learning unit that generates a trained model that has learned the relationship between a change in the flow rate and a change in the size of the clearance and records the trained model in the database, and infers the size of the clearance based on the trained model and the measured flow rate, and determines whether the inferred clearance exceeds the threshold range. (Supplementary Note 5) The control unit of the rotary compressor inspection device according to Supplementary Note 4 trains the trained model to learn the relationship between the change in the flow rate and the change in the angle of the inclination of the axis of the piston relative to the inner circumferential surface of the compression chamber, and infers the inclination of the piston based on the trained model and the measured flow rate.(Supplementary Note 6) An inspection device for a rotary compressor comprising a plurality of cylinders arranged in the axial direction, each cylinder being provided with the piston with a different eccentricity direction, wherein the control unit records in the database the relationship between the phase of the piston in each of the cylinders and the flow rate, and identifies a cylinder among the plurality of cylinders having a large clearance, the inspection device for a rotary compressor according to any one of Supplementary Note 2 to Supplementary Note 5. (Supplementary Note 7) An inspection device for a rotary compressor according to any one of Supplementary Note 2 to Supplementary Note 6, further comprising: a supplier that injects gas into the suction port, the supplier adjusting the pressure of the gas injected into the compression chamber to a set pressure value, and the measuring instrument measuring the flow rate per unit time of the gas injected by the supplier and flowing through the suction port. (Supplementary Note 8) The inspection device for a rotary compressor according to Supplementary Note 7, wherein the supply device includes 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 the gas into the compression chamber, and adjusts the pressure of the gas injected into the compression chamber of the cylinder to a set pressure value or less. (Supplementary Note 9) The inspection device for a rotary compressor according to any one of Supplementary Notes 1 to 8, wherein, when the flow rate corresponding to an upper limit value of the threshold range is defined as a first A reference value, the control unit sets a second reference value that is greater than the first A reference value by a set reference flow rate, and if the measured flow rate exceeds the second reference value, determines that the rotary compressor is defective in assembly. (Supplementary Note 10) The inspection device for a rotary compressor described in any one of Supplementary Note 1 to Supplementary Note 9, wherein the control unit derives a flow rate between a 1A reference value, which is the flow rate corresponding to an upper limit value of the threshold range, and a 1B reference value, which is the flow rate corresponding to a lower limit value of the threshold range, by linear approximation, and estimates the size of the clearance between the outer peripheral surface of the piston and the inner peripheral surface of the cylinder within the threshold range based on the measured flow rate.(Supplementary Note 11) The inspection device for a rotary compressor according to any one of Supplementary Note 1 to Supplementary Note 10, comprising: a holding unit connected to the rotary shaft that holds the piston at a position of a set phase in the cylinder, wherein the control unit has a database in which a relationship between a change in the flow rate and a change in the size of the clearance in each of the phases is recorded in advance, and determines whether or not the size of the clearance exceeds the threshold range based on the measured flow rate and the database. (Supplementary Note 12) A rotary compressor manufactured using the inspection device for a rotary compressor according to any one of Supplementary Note 1 to Supplementary Note 11. (Supplementary Note 13) A method for manufacturing a rotary compressor including: a cylinder having a space formed therein to serve as a compression chamber; a cylindrical piston fitted on a rotating shaft inserted into the space and rotating eccentrically within the space along an inner circumferential surface of the cylinder as the rotating shaft rotates, thereby forming the compression chamber; and a vane supported so as to be able to advance and retreat radially of the compression chamber as the piston rotates eccentrically, the method comprising: a flowing step of flowing gas through an intake port provided in the cylinder, the intake port communicating the compression chamber with the outside of the cylinder; a measuring step of measuring a flow rate per unit time of the gas flowing through the intake port; a determining step of determining whether or not a size of a clearance between the inner circumferential surface of the cylinder and the piston exceeds a set threshold value based on the measured flow rate; and an aligning step of aligning the piston when the flow rate exceeds the threshold range. (Supplementary Note 14) The method for manufacturing a rotary compressor according to Supplementary Note 13, wherein the flowing step comprises eccentrically rotating the piston by the rotary shaft to draw gas into the compression chamber from outside the compression chamber through the suction port, thereby flowing the gas through the suction port. (Supplementary Note 15) The method for manufacturing a rotary compressor according to Supplementary Note 13 or Supplementary Note 14, further comprising a database creation step of changing the size of the clearance between the inner circumferential surface of the cylinder and the piston, performing the flowing step and the measuring step for each size of the clearance, and creating a database in which a relationship between a change in the size of the clearance and an amount of change in the flow rate is recorded.(Supplementary Note 16) The method for manufacturing a rotary compressor according to Supplementary Note 15, wherein in the database creation step, the piston is positioned at a plurality of phases within the cylinder, the flowing step and the measuring step are performed for each of the phases, and a relationship of a change in the flow rate relative to a change in the size of the clearance for each of the phases is recorded in the database. (Supplementary Note 17) The method for manufacturing a rotary compressor according to any one of Supplementary Notes 13 to 16, wherein the suction port is provided in a first compression chamber, one of the compression chambers partitioned by the vane, and a discharge port communicating the second compression chamber with the outside of the cylinder is formed in the cylinder on the side of the other second compression chamber, and the flowing step and the measuring step are performed with the discharge port closed.

[0086] 1 Cylinder, 1IN Intake port, 1OUT Discharge port, 1P Branch portion, 2 Piston, 5 Vane, 20 Shaft (rotating shaft), 70, 70A, 270, 370 Rotary compressor inspection device, 71 Supply device, 71A First regulator, 71B Second regulator, 72 Measuring instrument, 75 Control unit, 100 Rotary compressor, CO Compression chamber, DB Database.

Claims

1. A cylinder having a space serving as a compression chamber formed therein, a columnar piston that is fitted to a rotating shaft inserted into the space and eccentrically rotates within the space along the inner peripheral surface of the cylinder as the rotating shaft rotates, and that constitutes the compression chamber, a vane that is supported so as to be able to advance and retreat in the radial direction of the compression chamber as the piston eccentrically rotates, and an inspection device for a rotary compressor, comprising: a measuring instrument that measures the flow rate per unit time of a gas flowing through an intake port that communicates the compression chamber provided in the cylinder with the outside of the cylinder; a control unit that determines whether or not the magnitude of a clearance between the outer peripheral surface of the piston and the inner peripheral surface of the cylinder exceeds a set threshold range based on the measured flow rate; An inspection device for a rotary compressor, comprising: An inspection device for a rotary compressor.

2. The control unit: previously records in a database and stores the relationship between the change amount of the flow rate with respect to the change amount of the magnitude of the clearance, and determines whether or not the magnitude of the clearance exceeds the threshold range based on the measured flow rate and the database. The inspection device for a rotary compressor according to claim 1. The inspection device for a rotary compressor according to claim 1.

3. The control unit: previously records in the database and stores the relationship between the change amount of the flow rate with respect to the change amount of the angle of inclination of the axis of the piston with respect to the inner peripheral surface of the compression chamber, and detects the inclination of the piston based on the measured flow rate and the database. The inspection device for a rotary compressor according to claim 2. The inspection device for a rotary compressor according to claim 2.

4. The control unit: comprises a learning unit that generates and records a learned model obtained by learning the relationship between the change amount of the flow rate with respect to the change amount of the magnitude of the clearance, infers the magnitude of the clearance based on the learned model and the measured flow rate, and determines whether or not the inferred clearance exceeds the threshold range. The inspection device for a rotary compressor according to claim 1. The inspection device for a rotary compressor according to claim 1.

5. The control unit: causes the learned model to learn the relationship between the change amount of the flow rate with respect to the change amount of the angle of inclination of the axis of the piston with respect to the inner peripheral surface of the compression chamber, and infers the inclination of the piston based on the learned model and the measured flow rate. The inspection device for a rotary compressor according to claim 4. The inspection device for a rotary compressor according to claim 4.

6. An inspection device for a rotary compressor provided with a plurality of the cylinders in the axial direction, wherein each of the cylinders is provided with a piston having a different eccentric direction. The control unit records in a database the relationship between the phase of the piston and the flow rate in each of the cylinders, and identifies the cylinder having a large clearance among the plurality of cylinders. The inspection device for a rotary compressor according to claim 1.

7. Comprising a feeder for injecting gas into the suction port. The feeder 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 feeder and flowing through the suction port. The inspection device for a rotary compressor according to claim 1.

8. The feeder includes 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, and adjusts the pressure of the gas injected into the compression chamber of the cylinder to be equal to or lower than a set pressure value. The inspection device for a rotary compressor according to claim 7.

9. When the flow rate corresponding to the upper limit value of the threshold range is taken as the first A reference value, The control unit sets a second reference value that is larger than the set reference flow rate by the reference flow rate compared to the first A reference value. When the measured flow rate exceeds the second reference value, it is determined that there is a defective assembly of the rotary compressor. The inspection device for a rotary compressor according to claim 1.

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

11. A holding portion for holding the piston at a set phase position in the cylinder is connected to the rotating shaft. The control unit previously records in a database the relationship between the change amount of the flow rate with respect to the change in the magnitude of the clearance at each phase. Based on the measured flow rate and the database, determines whether the magnitude of the clearance exceeds the threshold range. The inspection device for a rotary compressor according to claim 1.

12. A rotary compressor manufactured using the inspection apparatus for a rotary compressor according to any one of Claims 1 to 11.

13. A cylinder having a space formed therein as a compression chamber, A columnar piston that is fitted to a rotating shaft inserted into the space and eccentrically rotates within the space along the inner peripheral surface of the cylinder as the rotating shaft rotates, and constitutes the compression chamber, A vane that is supported so as to be able to advance and retreat in the radial direction of the compression chamber as the piston eccentrically rotates, and a method for manufacturing a rotary compressor, comprising: A flow-through step of flowing a gas through an intake port that communicates 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 intake port; A determination step of determining whether or not the magnitude of the clearance between the inner peripheral 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. When the flow rate exceeds the threshold range, a centering step of centering the piston is provided. The method for manufacturing a rotary compressor according to Claim 13.

15. The flow-through step includes: Eccentrically rotating the piston by the rotating shaft and inhaling a gas from the outside of the compression chamber into the compression chamber through the intake port, thereby flowing the gas through the intake port. The method for manufacturing a rotary compressor according to Claim 13.

16. A database creation step of changing the magnitude of the clearance between the inner peripheral surface of the cylinder and the piston, performing the flow-through step and the measurement step for each magnitude of the clearance, and creating a database recording the relationship between the change amount of the flow rate with respect to the change in the magnitude of the clearance. The method for manufacturing a rotary compressor according to Claim 13.

17. In the database creation step, Positioning the piston at a plurality of phases within the cylinder, performing the flow-through step and the measurement step for each phase, and recording in the database the relationship between the change amount of the flow rate with respect to the change in the magnitude of the clearance for each phase. The method for manufacturing a rotary compressor according to Claim 16.

18. Generate a learned model that has learned the relationship between the change amount of the flow rate with respect to the change in the magnitude of the clearance. Infer the size of the clearance based on the learned model and the measured flow rate, and determine whether the inferred clearance exceeds the threshold range. The method for manufacturing a rotary compressor according to claim 13.

19. The suction port is provided in one first compression chamber that partitions the compression chamber by the vane, and a discharge port that communicates the second compression chamber with the outside of the cylinder is formed in the cylinder on the side of the other second compression chamber. The flow passage process and the measurement process are performed with the discharge port blocked. The method for manufacturing a rotary compressor according to any one of claims 13 to 18.