JP2015105630A - Rotary compressor and method of manufacturing bearing used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect wear of a bearing while suppressing rising costs.SOLUTION: A rotary compressor includes: a driving shaft 23 to drive a compression mechanism; and a bearing 53a that is disposed along the circumference of the driving shaft 23 and slidably supports the driving shaft 23. An electrode surface on an inner peripheral side is disposed at a position outwardly offset a predetermined amount than a sliding surface F with respect to the driving shaft 23, and a pair of detection electrodes 3a and 3b are disposed which are communicated with each other via the driving shaft 23 so as to detect wear, in the inner peripheral side of the bearing 53a.

Description

  The present invention relates to a rotary compressor and a method for manufacturing a bearing used therefor, and more particularly to a rotary compressor provided with a drive shaft and a bearing that slidably supports the drive shaft, and a method for manufacturing a bearing used therefor. .

  In a rotary compressor such as a rotary type or scroll type equipped with a drive shaft and a bearing that slidably supports it, an oil film of refrigeration oil is formed between the drive shaft and the bearing, and the lubrication state by the oil film And the drive shaft is rotated. However, when a decrease in oil viscosity due to the dissolution of the refrigerant in the refrigeration oil or a lack of oil due to a decrease in the amount of oil in the compressor occurs, the drive shaft and the bearing come into contact with each other. Wear occurs on the contact surface, particularly the contact surface on the bearing side.

  For example, Patent Document 1 discloses a compressor that loads a voltage between a rotating shaft (drive shaft) and a bearing and detects contact between the rotating shaft and the bearing based on a change in voltage or current.

  Patent Document 2 discloses a screw compressor in which a gap sensor is provided on an inner wall of a casing, a gap between the inner wall of the casing and the end face of the compression rotor is detected, and an operation such as operation stop is performed based on the detected signal. Has been.

JP 61-31685 A Japanese Patent Laid-Open No. 2-207187

  By the way, in the rotary compressor, if the wear on the contact surface between the drive shaft and the bearing advances, the frictional resistance in the worn portion increases and the operating current value increases, so the operation is stopped based on the current value. Etc. will be performed. However, when the frictional resistance is increased, the wear has progressed considerably, so that the wear powder generated from the bearing is discharged from the rotary compressor to the refrigerant pipe, and the wear powder is used to connect other refrigerant pipes to the refrigerant pipe. There is a risk of equipment failure.

  Here, as in the compressor disclosed in Patent Document 1, when the contact between the rotating shaft and the bearing is electrically detected, the rotating shaft and the bearing may come into contact depending on the operation state of the compressor. Therefore, it is difficult to detect the wear actually occurring in the bearing only by detecting the contact between the rotating shaft and the bearing. When the gap sensor provided in the screw compressor disclosed in Patent Document 2 is applied to a rotary compressor, the gap between the drive shaft and the bearing is detected to detect the wear of the bearing. Even if it can be done, it will increase the cost.

  The present invention has been made in view of such points, and an object of the present invention is to reliably detect wear of a bearing while suppressing an increase in cost.

  In order to achieve the above-mentioned object, the present invention provides an inner circumferential position at a position offset on the inner circumferential side of the bearing (53a, 53b) by a predetermined amount outside the sliding surface (F) with the drive shaft (23). A pair of detection electrodes (3a to 3f) that are arranged on the side electrode surface and are electrically connected to each other via the drive shaft (23) to detect wear are provided.

  Specifically, the first invention is a drive shaft (23) for driving the compression mechanism (30) and a bearing provided around the drive shaft (23) and slidably supporting the drive shaft (23). (53a, 53b) provided on the inner peripheral side of the bearing (53a, 53b) outside the sliding surface (F) with the drive shaft (23). The electrode surface on the inner peripheral side is arranged at a position offset by a fixed amount, and a pair of detection electrodes (3a to 3f) that detect wear by being connected to each other via the drive shaft (23) are provided. It is a feature.

  In the first invention, the pair of detection electrodes (3a to 3f) are provided on the inner peripheral side of the bearings (53a, 53b) that slidably support the drive shaft (23) that drives the compression mechanism (30) from the periphery. Is provided. Here, the surface of each electrode on the inner peripheral side is arranged at a position offset by a predetermined amount on the outer side of the sliding surface (F) with the drive shaft (23) in the pair of detection electrodes (3a to 3f). Yes. Therefore, when the compression mechanism (30) is driven and the sliding surface (F) on the inner peripheral side of the bearing (53a, 53b) is worn by an offset amount, the pair of detection electrodes (3a-3f) It becomes possible for the surface of each electrode to contact the surface of the drive shaft (23). Accordingly, the pair of detection electrodes (3a to 3f) can be electrically connected to each other via the drive shaft (23). For example, the conduction state between the pair of detection electrodes (3a to 3f) is electrically confirmed. As a result, the wear of the sliding surface (F) of the bearing (53a, 53b) can be reliably detected. Further, unlike Patent Document 2, it is not necessary to install an expensive gap sensor or the like in the rotary compressor (10), so that the cost increase is suppressed and the bearings (53a, 53b) are worn. Can be reliably detected.

  A second invention is characterized in that, in the first invention, a plurality of sets of the pair of detection electrodes (3c to 3f) are provided, and the offset amounts for each set are different from each other. is there.

  In the second invention, a plurality of pairs of detection electrodes (3c to 3f) are provided on the inner peripheral side of the bearing (53b), and the pair of detection electrodes (3c to 3f) are offset for each pair. Since the amounts are different from each other, the wear of the bearing (53b) can be detected in stages.

  A third invention is characterized in that, in the first or second invention, the pair of detection electrodes (3a to 3f) is provided along the axial direction of the drive shaft (23). is there.

  In the third invention, since the pair of detection electrodes (3a to 3f) are provided along the axial direction of the drive shaft (23), the sliding surface (F) on the inner peripheral side of the bearing (53a, 53b) Is worn by an offset amount, a current flows along the axial direction on the surface of the drive shaft (23), whereby the pair of detection electrodes (3a to 3f) are electrically connected to each other.

  According to a fourth invention, in the third invention, each of the detection electrodes (3a to 3f) is formed in an annular shape.

  In the fourth invention, since each detection electrode (3a-3f) is formed in an annular shape, each detection electrode (3a-3f) is arranged over the entire circumference on the inner peripheral side of the bearing (53a, 53b). Has been. As a result, when the sliding surface (F) on the inner peripheral side of the bearing (53a, 53b) is worn by an offset amount, the pair of detection electrodes (3a to 3f) arranged over the entire periphery is Since it becomes easy to contact the surface of (23), the wear of the bearings (53a, 53b) can be detected more reliably.

  A fifth invention is a method of manufacturing a bearing (53a, 53b) provided around a drive shaft (23) for driving the compression mechanism (30) and slidably supporting the drive shaft (23). After forming the pair of electrode members (3, 3) made of conductive resin on the plate-like member (1), an insulating layer made of non-conductive resin so as to cover the pair of electrode members (3, 3) ( 4) is formed on the entire surface, and the plate-like member (1) on which the insulating layer (4) is formed is formed into a cylindrical shape so that the insulating layer (4) side is inside. After forming the body (5), a molded body fixing step of fixing the molded body (5) to the inner peripheral surface of the housing (50) formed with the inner peripheral surface, and the molded body (5) fixed to the housing (50) After turning the entire surface layer of the insulating layer (4) in the molded body (5) to form the sliding surface (F) with the drive shaft (23), it corresponds to the pair of electrode members (3, 3). Part The surface layer of the pair of electrode members (3, 3) is turned by cutting, and the electrode surface is arranged at a position offset by a predetermined amount outside the sliding surface (F), and the drive shaft ( And a turning process for forming a pair of detection electrodes (3a to 3f) that are electrically connected to each other via 23) to detect wear.

  In the fifth invention, in the turning process, by turning the entire surface layer of the insulating layer (4) in the cylindrical molded body (5) fixed to the inner peripheral surface of the housing (50) in the molded body fixing process, A sliding surface (F) with the drive shaft (23) is formed. Thereafter, in the turning process, the portions corresponding to the pair of electrode members (3, 3) of the insulating layer (4) where the sliding surface (F) is formed are turned, and the pair of electrode members (3, 3) A pair of sensing electrodes (3a to 3f) is formed by turning the surface layer. Here, when the pair of sensing electrodes (3a to 3f) is formed, the sliding surface (F) formed reliably by turning the entire surface layer of the insulating layer (4) in the molded body (5). Since a part is further turned, each electrode surface of the pair of detection electrodes (3a to 3f) can be surely disposed at a position offset by a predetermined amount outside the sliding surface (F). . Therefore, when the compression mechanism (30) is driven and the sliding surface (F) on the inner peripheral side of the bearing (53a, 53b) is worn by an offset amount, the pair of detection electrodes (3a-3f) It becomes possible for the surface of each electrode to contact the surface of the drive shaft (23). Accordingly, the pair of detection electrodes (3a to 3f) can be electrically connected to each other via the drive shaft (23). For example, the conduction state between the pair of detection electrodes (3a to 3f) is electrically confirmed. As a result, the wear of the sliding surface (F) of the bearing (53a, 53b) can be reliably detected. Further, unlike Patent Document 2, it is not necessary to install an expensive gap sensor or the like in the rotary compressor (10), so that the cost increase is suppressed and the bearings (53a, 53b) are worn. Can be reliably detected.

  According to the present invention, on the inner peripheral side of the bearings (53a, 53b), the electrode surface on the inner peripheral side is offset by a predetermined amount outside the sliding surface (F) with the drive shaft (23). Is provided, and a pair of detection electrodes (3a to 3f) that are connected to each other via the drive shaft (23) to detect wear are provided, so that cost increases are suppressed, and the bearings (53a, 53b) Wear can be reliably detected.

1 is a longitudinal sectional view of a rotary compressor according to Embodiment 1. FIG. 1 is a cross-sectional view of a bearing that constitutes a rotary compressor according to Embodiment 1. FIG. It is a schematic diagram which shows the structure of the inner peripheral side of the bearing which concerns on Embodiment 1 in a half state. FIG. 3 is a schematic diagram showing a bearing manufacturing method according to the first embodiment. FIG. 5 is a cross-sectional view of a bearing that constitutes a rotary compressor according to a second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments.

Embodiment 1 of the Invention
1 to 4 show Embodiment 1 of a rotary compressor according to the present invention and a method of manufacturing a bearing used therefor. In the following embodiments, a scroll compressor is exemplified as the rotary compressor. Here, FIG. 1 is a longitudinal sectional view of the scroll compressor (10) of the present embodiment.

<Configuration of scroll compressor>
The scroll compressor (10) is connected to a refrigerant circuit that performs a vapor compression refrigeration cycle of an air conditioner, for example. Here, the scroll compressor (10) includes a casing (11), a rotary compression mechanism (30), and a drive mechanism (20) that rotationally drives the compression mechanism (30).

  The casing (11) is composed of a vertically long cylindrical sealed container with both ends closed. Here, the casing (11) was fixed to the cylindrical body (12), the upper end plate (13) fixed to the upper end side of the body (12), and the lower end side of the body (12). And a lower end plate (14).

  The internal space of the casing (11) is vertically divided by a housing (50) to be described later joined to the inner peripheral surface of the casing (11). Here, in the internal space of the casing (11), the space above the housing (50) constitutes the upper space (15), and the space below the housing (50) constitutes the lower space (16). It is composed.

  At the bottom of the lower space (16) in the casing (11), an oil reservoir (17) is provided for storing refrigeration oil that lubricates the sliding portion of the scroll compressor (10).

  A terminal (65) is attached to the side wall surface of the casing (11). Here, the terminal (65) includes a plurality of terminal pins (61) and an insulating member (62) for attaching the plurality of terminal pins (61) to the casing (11). Here, both end portions of each terminal pin (61) protrude inward and outward of the casing (11), respectively. In addition, the inner end of each terminal pin (61) is connected to a motor (21), detection electrodes (3a, 3b) and the like which will be described later. Further, the outer end of each terminal pin (61) is connected to various electric circuits. The terminal (65) is covered with a terminal cover (63).

  A suction pipe (18) and a discharge pipe (19) are attached to the casing (11). Here, the suction pipe joint (47) connected to the lower end of the suction pipe (18) passes through the upper part of the upper end plate (13). Moreover, the discharge pipe (19) has penetrated the trunk | drum (12). One end of the discharge pipe (19) opens into the lower space (16) of the casing (11).

  The drive mechanism (20) includes a motor (21) and a drive shaft (23).

  The motor (21) is accommodated in the lower space (16) of the casing (11). Here, the motor (21) includes a stator (21a) and a rotor (21b) formed in a cylindrical shape.

  The stator (21a) is fixed to the body (12) of the casing (11). A rotor (21b) is disposed in the hollow portion of the stator (21a).

  A drive shaft (23) is fixed in the hollow portion of the rotor (21b) so as to penetrate the rotor (21b). In the drive mechanism (20), the rotor (21b) of the motor (21) and the drive shaft (23) rotate integrally.

  The drive shaft (23) includes a main shaft portion (24) provided to extend in the vertical direction and an eccentric portion (25) provided on the upper side of the main shaft portion (24) and integrally formed with the main shaft portion (24). ).

  The eccentric part (25) is formed with a smaller diameter than the maximum diameter of the main shaft part (24). The axis of the eccentric portion (25) is eccentric by a predetermined distance with respect to the axis of the main shaft portion (24). The lower end portion of the main shaft portion (24) of the drive shaft (23) is rotatably supported by a bearing (53c), which will be described later, attached to the lower bearing portion (28). Here, the lower bearing portion (28) is fixed near the lower end of the body portion (12) in the casing (11). The upper end portion of the main shaft portion (24) is rotatably supported by a bearing (53a), which will be described later, mounted on the housing (50).

  An oil supply pump (26) is provided at the lower end of the drive shaft (23). Here, the suction port of the oil supply pump (26) is open to the oil reservoir (17) of the casing (11). The discharge port of the oil pump (26) is connected to an oil passage (27) provided inside the drive shaft (23). Therefore, the refrigerating machine oil sucked up from the oil reservoir (17) of the casing (11) by the oil supply pump (26) is supplied to the sliding portion of the scroll compressor (10) through the oil supply passage (27).

  The compression mechanism (30) includes a movable scroll (35), a fixed scroll (40), and a housing (50), and constitutes a so-called scroll type compression mechanism. Here, the housing (50) and the fixed scroll (40) are fastened to each other by bolts, and the movable scroll (35) is rotatably accommodated in the space between them.

  The movable scroll (35) has a substantially disc-shaped movable side end plate portion (36).

  A movable side wrap (37) is erected on the upper surface (hereinafter referred to as the front surface) of the movable side end plate portion (36). Here, the movable side wrap (37) is a wall body that spirally extends outward from the vicinity of the center of the movable side end plate portion (36). Further, a boss portion (38) is projected from the lower surface (hereinafter referred to as the back surface) of the movable side end plate portion (36).

  The fixed scroll (40) has a substantially disc-shaped fixed side end plate portion (41).

  A fixed side wrap (42) is erected on the lower surface (hereinafter referred to as the front surface) of the fixed side end plate portion (41). Here, the fixed-side wrap (42) is spirally extended outward from the vicinity of the center of the fixed-side end plate portion (41), and is formed so as to mesh with the movable-side wrap (37) of the movable scroll (35). It is the wall body made. A compression chamber (31) is formed between the fixed wrap (42) and the movable wrap (37).

  The fixed scroll (40) has an outer edge portion (43) continuous radially outward from the outermost peripheral wall of the fixed side wrap (42).

  The lower end surface of the outer edge portion (43) is fixed to the upper end surface of the housing (50). In addition, an opening (44) that opens upward is formed in the outer edge (43). The outer edge (43) is formed with a suction port (34) that communicates the inside of the opening (44) and the outermost peripheral end of the compression chamber (31). Here, the suction port (34) opens to the suction position of the compression chamber (31). The suction pipe joint (47) described above is connected to the opening (44) of the outer edge (43).

  The fixed end plate (41) is formed with a discharge port (32) that is positioned near the center of the fixed wrap (42) and penetrates in the vertical direction. Here, the lower end of the discharge port (32) opens to the discharge position of the compression chamber (31). Further, the upper end of the discharge port (32) opens into a discharge chamber (46) defined in the upper part of the fixed scroll (40). Although not shown, the discharge chamber (46) communicates with the lower space (16) of the casing (11).

  The housing (50) is formed in a substantially cylindrical shape. Here, the outer peripheral surface of the housing (50) is formed such that the upper portion has a larger diameter than the lower portion. The upper part of the outer peripheral surface of the housing (50) is fixed to the inner peripheral surface of the casing (11).

  The drive shaft (23) is inserted into the hollow portion of the housing (50). The hollow portion of the housing (50) is formed so that the upper portion has a larger diameter than the lower portion. A bearing (53a) is attached to the lower portion of the hollow portion of the housing (50). Further, the upper part of the hollow portion of the housing (50) is partitioned by the seal ring (60) to constitute the inner back pressure space (54). Here, the inner back pressure space (54) faces the back surface of the movable scroll (35). Further, the boss portion (38) of the movable scroll (35) is located in the inner back pressure space (54). The eccentric portion (25) of the drive shaft (23) protruding from the upper end of the bearing (53a) is engaged with the boss portion (38) via the bearing (53c).

  An end portion of the oil supply passage (27) of the drive shaft (23) is opened on the outer peripheral surface of the eccentric portion (25). Therefore, the refrigerating machine oil from the oil supply passage (27) is supplied to the gap between the bearing (53c) attached to the boss part (38) and the eccentric part (25). The oil supplied to the gap also flows into the inner back pressure space (54). Therefore, the inner back pressure space (54) has the same pressure as the lower space (16) of the casing (11). Then, the pressure in the inner back pressure space (54) acts on the back surface of the movable scroll (35) to press the movable scroll (35) against the fixed scroll (40).

  An opening (57) into which the movable side end plate (36) of the movable scroll (35) is fitted is formed on the upper end surface of the housing (50). Here, an annular outer back pressure space (56) partitioned by the inner back pressure space (54) and the seal ring (60) is formed on the bottom surface of the opening (57). The outer back pressure space (56) faces the back surface of the movable scroll (35). The housing (50) and the back of the movable scroll (35) are opposed to each other with a gap, and the inner back pressure space (54) and the outer back pressure space (56) communicate with each other through the gap. Yes. This gap is formed by the movable scroll (35) being supported by an Oldham coupling (not shown).

-bearing-
The bearing (53a) will be described with reference to FIGS. Here, FIG. 2 is a cross-sectional view of the bearing (53a) constituting the scroll compressor (10). FIG. 3 is a schematic view showing the structure of the inner peripheral side of the bearing (53a) in a half-split state.

  The bearing (53a) includes a back metal member (1) provided in a cylindrical shape on the inner peripheral surface side of the housing (50), a base coat film (2) provided on the inner peripheral surface of the back metal member (1), and a base coat. A pair of sensing electrodes (3a, 3b) provided in an annular shape on the inner peripheral surface of the film (2) and an insulating layer (4a) provided so as to cover the inner peripheral surface of the base coat film (2) I have.

  The back metal member (1) is formed, for example, by forming a steel plate or the like into a cylindrical shape. The base coat film (2) is formed of, for example, a coating film made of a polyamideimide-based non-conductive resin. In addition, the detection electrodes (3a, 3b) are formed of, for example, a linear member made of a polyamideimide conductive resin mixed with a conductive filler. The insulating layer (4a) is formed of, for example, a polyamideimide-based non-conductive resin coating film. Here, a pair for inserting a pair of wires (6a, 6b) respectively connected to the pair of detection electrodes (3a, 3b) into the back metal member (1), the base coat film (2) and the housing (50). Through-holes (H) are formed (see FIG. 4). As shown in FIG. 1, the pair of detection electrodes (3a, 3b) is connected to the terminal pin (61) of the terminal (65) via the pair of wires (6a, 6b), respectively.

  A sliding surface (F) with the drive shaft (23) is provided on the inner peripheral side of the bearing (53a), and a pair is positioned at a position offset by a predetermined amount (La) outside the sliding surface (F). The electrode surfaces on the inner peripheral side of the detection electrodes (3a, 3b) are arranged. Here, the offset amount (La) of the pair of detection electrodes (3a, 3b) is, for example, 20 μm. In addition, the pair of detection electrodes (3a, 3b) has an inner peripheral side electrode surface that is worn when the inner peripheral sliding surface (F) of the bearing (53a) is worn by an offset amount (La). It is comprised so that the surface of a drive shaft (23) may be contacted.

  Each bearing (53c) mounted on the lower bearing portion (28) and the boss portion (38) has, for example, a base coat film (2) and a pair of detection electrodes (3a, 3b) omitted in the bearing (53a) It is configured.

  Next, the manufacturing method of a bearing (53a) is demonstrated, referring FIG. Here, FIG. 4 is a schematic view showing a method for manufacturing the bearing (53a). The manufacturing method of the bearing (53a) of the present embodiment includes a laminated body forming step, a molded body fixing step, and a turning step.

  In the laminated body formation process performed first, as shown in FIG. 4A, first, after forming the base coat film (2) on the surface of the back metal member (1) which is a plate-like member, the back metal material (1) and A pair of through holes (H) are formed in the base coat film (2). Furthermore, a pair of electrode members (3, 3) made of conductive resin are arranged in parallel so as to overlap the pair of through holes (H), and then non-conductive so as to cover the pair of electrode members (3, 3). An insulating layer (4) made of a conductive resin is formed on the entire surface.

  In the molded body fixing step to be performed next, as shown in FIG. 4B, first, the back metal member (1) on which the insulating layer (4) is formed in the laminated body forming step is on the inner side of the insulating layer (4) side. In this way, a molded body (5) is produced by forming into a cylindrical shape. Further, the molded body (5) is inserted into the hollow portion of the housing (50), and the molded body (5) is fixed to the inner peripheral surface of the housing (50).

  In the final turning process, as shown in FIG. 4C, first, the entire surface layer of the insulating layer (4) in the molded body (5) fixed to the inner peripheral surface of the housing (50) in the molded body fixing process. Is turned with a turning tool (T) to form a sliding surface (F) with the drive shaft (23). Further, by turning the insulating layer (4) corresponding to the pair of electrode members (3, 3) with the turning tool (T) by an offset amount (La), the pair of electrode members (3, 3) ) To form a pair of sensing electrodes (3a, 3b) and an insulating layer (4a).

  As described above, the bearing (53a) attached to the housing (50) can be manufactured.

<Operation of scroll compressor>
Next, the operation of the scroll compressor (10) described above will be described.

  When the motor (21) of the scroll compressor (10) is energized, the drive shaft (23) rotates with the rotor (21b), and the movable scroll (35) is eccentric about the axis of the drive shaft (23). Rotate. As the movable scroll (35) rotates eccentrically, the volume of the compression chamber (31) repeatedly increases and decreases periodically.

  Specifically, when the drive shaft (23) rotates, the refrigerant is sucked into the compression chamber (31) from the suction port (34). As the drive shaft (23) rotates, the compression chamber (31) is closed. Furthermore, as the rotation of the drive shaft (23) proceeds, the volume of the compression chamber (31) starts to decrease, and the compression of the refrigerant in the compression chamber (31) is started.

  Thereafter, when the volume of the compression chamber (31) is further reduced and the volume of the compression chamber (31) is reduced to a predetermined volume, the discharge port (32) is opened. Then, the refrigerant compressed in the compression chamber (31) is discharged to the discharge chamber (46) of the fixed scroll (40) through the discharge port (32). Further, the refrigerant in the discharge chamber (46) is discharged from the discharge pipe (19) through the lower space (16) of the casing (11).

<Bearing wear detection>
Here, when the operation of the scroll compressor (10) is continued, the sliding surface (F) on the inner peripheral side of the bearing (53a) is worn by an offset amount (La), that is, 20 μm. The electrode surfaces of the pair of detection electrodes (3a, 3b) can come into contact with the surface of the drive shaft (23). In this case, since the pair of detection electrodes (3a, 3b) can be connected to each other via the drive shaft (23), for example, the change in the value of the current flowing between the pair of detection electrodes (3a, 3b) is measured at any time. In addition, when the conduction state between the pair of detection electrodes (3a, 3b) is electrically confirmed, it is considered that 20 μm of wear has occurred on the sliding surface (F) of the bearing (53a). As a result, 20 μm of wear on the sliding surface (F) of the bearing (53a) is detected. When the wear is detected, the operation of the scroll compressor (10) is stopped.

  As described above, according to the scroll compressor (10) of the present embodiment, the inner peripheral side of the bearing (53a) that slidably supports the drive shaft (23) that drives the compression mechanism (30) from the periphery. Is provided with a pair of detection electrodes (3a, 3b). Here, the pair of detection electrodes (3a, 3b) has the electrode surfaces on the inner peripheral side disposed at positions offset by a predetermined amount outside the sliding surface (F) with the drive shaft (23). Yes. Therefore, when the compression mechanism (30) is driven and the sliding surface (F) on the inner peripheral side of the bearing (53a) is worn by an offset amount, each of the pair of detection electrodes (3a, 3b) It becomes possible for the electrode surface to contact the surface of the drive shaft (23). As a result, the pair of detection electrodes (3a, 3b) can be electrically connected to each other via the drive shaft (23). Therefore, by electrically confirming the conduction state between the pair of detection electrodes (3a, 3b) The wear of the sliding surface (F) of the bearing (53a) can be reliably detected. Further, unlike Patent Document 2, it is not necessary to install an expensive gap sensor or the like inside the scroll compressor (10), so the cost increase is suppressed and the bearing (53a) is reliably worn. Can be detected. In addition, for example, since the wear of the bearing (53a) can be reliably detected before the operating current value of the scroll compressor (10) increases, the failure of the equipment due to the wear powder of the bearing (53a) can be prevented. Can be suppressed.

  Further, according to the scroll compressor (10) of the present embodiment, the pair of detection electrodes (3a, 3b) is provided along the axial direction of the drive shaft (23), and each detection electrode (3a, 3b) is a circle. Since it is formed in an annular shape, the detection electrodes (3a to 3f) are arranged over the entire circumference on the inner circumference side of the bearing (53a). As a result, when the sliding surface (F) on the inner peripheral side of the bearing (53a) is worn by an offset amount, the pair of detection electrodes (3a, 3b) arranged over the entire circumference is connected to the drive shaft (23 ), The wear of the bearing (53a) can be detected more reliably.

  Moreover, according to the manufacturing method of the bearing (53a) which comprises the scroll compressor (10) of this embodiment, in the turning process, the cylindrical shape fixed to the inner peripheral surface of the housing (50) in the molded body fixing process. A sliding surface (F) with the drive shaft (23) is formed by turning the entire surface layer of the insulating layer (4) in the molded body (5). Thereafter, in the turning process, the portions corresponding to the pair of electrode members (3, 3) of the insulating layer (4) where the sliding surface (F) is formed are turned, and the pair of electrode members (3, 3) A pair of detection electrodes (3a, 3b) is formed by turning the surface layer. Here, when the pair of sensing electrodes (3a, 3b) is formed, the sliding surface (F) formed reliably by turning the entire surface layer of the insulating layer (4) in the molded body (5). Since a part is further turned, each electrode surface of the pair of detection electrodes (3a, 3b) can be surely disposed at a position offset by a predetermined amount outside the sliding surface (F). .

<< Embodiment 2 of the Invention >>
FIG. 5 is a view corresponding to FIG. 2 of the bearing (53b) constituting the scroll compressor of the present embodiment. In addition, in each following embodiment, the same code | symbol is attached | subjected about the same part as FIGS. 1-4, and the detailed description is abbreviate | omitted.

  In the first embodiment, the scroll compressor (10) including the bearing (53a) provided with the pair of detection electrodes (3a, 3b) is exemplified. However, in the present embodiment, two pairs of detection electrodes ( The scroll compressor provided with the bearing (53b) provided with 3c-3f) is illustrated.

  As with the scroll compressor (10) of the first embodiment, the scroll compressor according to the present embodiment rotates the casing (11), the rotary compression mechanism (30), and the compression mechanism (30). Mechanism (20).

  In the compression mechanism (30), a bearing (53b) is attached to the lower portion of the hollow portion of the housing (50) instead of the bearing (53a) of the first embodiment.

  The bearing (53b) includes a back metal member (1) provided in a cylindrical shape on the inner peripheral surface side of the housing (50), a base coat film (2) provided on the inner peripheral surface of the back metal member (1), and a base coat. Two pairs of sensing electrodes (3c, 3d) and a pair of sensing electrodes (3e, 3f) provided in an annular shape on the inner circumferential surface of the membrane (2), and the inner circumferential surface of the base coat membrane (2) And an insulating layer (4b) provided so as to cover it.

  The detection electrodes (3c to 3f) are formed of, for example, a linear member made of a polyamideimide-based conductive resin mixed with a conductive filler. Further, the insulating layer (4b) is formed of, for example, a coating film of a resin made of a polyamideimide-based non-conductive resin. Here, the back metal member (1), the base coat film (2), and the housing (50) are formed with through holes for inserting the wirings (6c to 6f) connected to the detection electrodes (3c to 3f), respectively. ing.

  A sliding surface (F) with the drive shaft (23) is provided on the inner peripheral side of the bearing (53b), and a pair is set at a position offset by a predetermined amount (Lb) outside the sliding surface (F). A pair of sensing electrodes (3e, 3f) at positions where each inner electrode surface of the sensing electrode (3c, 3d) is arranged and offset by a predetermined amount (Lc) outside the sliding surface (F) The electrode surfaces on the inner peripheral side are arranged. Here, the offset amount (Lb) of the pair of detection electrodes (3c, 3d) is, for example, 10 μm, and the offset amount (Lc) of the pair of detection electrodes (3e, 3f), for example, is 20 μm. It is. In addition, the pair of detection electrodes (3c, 3d) has an electrode surface on the inner circumferential side that is worn when the sliding surface (F) on the inner circumferential side of the bearing (53b) is worn by an offset amount (Lb). It is comprised so that the surface of a drive shaft (23) may be contacted. In addition, the pair of detection electrodes (3e, 3f) are provided on the inner peripheral side when the sliding surface (F) on the inner peripheral side of the bearing (53b) is worn by an offset amount (Lc). The surface is configured to contact the surface of the drive shaft (23).

  The bearing (53b) having the above-described structure is a two-stage turning performed in the turning process by making two pairs of electrode members arranged and formed in the laminate forming process in the manufacturing method of the bearing (53a) described in the first embodiment. Can be produced by carrying out in three stages.

  When the operation of the scroll compressor according to the present embodiment is continued, the sliding surface (F) on the inner peripheral side of the bearing (53b) is worn by an offset amount (Lb), that is, 10 μm. The electrode surfaces of the detection electrodes (3c, 3d) can come into contact with the surface of the drive shaft (23). In this case, since the pair of detection electrodes (3c, 3d) can be connected to each other via the drive shaft (23), the conduction state between the pair of detection electrodes (3c, 3d) is electrically confirmed. It is considered that 10 μm of wear occurred on the sliding surface (F) of the bearing (53b). Furthermore, when the sliding surface (F) on the inner peripheral side of the bearing (53b) is worn by an offset amount (Lc), that is, 20 μm, the surface of each electrode of the pair of detection electrodes (3e, 3f) It becomes possible to contact the surface of the drive shaft (23). In this case, since the pair of detection electrodes (3e, 3f) can be electrically connected to each other via the drive shaft (23), the conduction state between the pair of detection electrodes (3e, 3f) is electrically confirmed. It is considered that 20 μm of wear occurred on the sliding surface (F) of the bearing (53b). Therefore, if 10 μm wear on the sliding surface (F) of the bearing (53b) is detected, for example, an alarm is issued to request service, or the operating conditions are changed to suppress the rotation speed of the scroll compressor. Or Further, when 20 μm wear is detected on the sliding surface (F) of the bearing (53b), the operation of the scroll compressor is stopped.

  As described above, according to the scroll compressor of the present embodiment, as in the first embodiment, the bearing (53b) that slidably supports the drive shaft (23) that drives the compression mechanism (30) from the periphery. ) Is provided with a pair of detection electrodes (3c to 3f), it is possible to reliably detect the wear of the bearing (53b) while suppressing an increase in cost.

  According to the scroll compressor of the present embodiment, a plurality of pairs of detection electrodes (3c to 3f) are provided on the inner peripheral side of the bearing (53b), and the pair of detection electrodes (3c, 3d) and the pair of detection electrodes Since the electrodes (3e, 3f) have different amounts of offset for each group, the wear of the bearing (53b) can be detected in stages.

<< Other Embodiments >>
In each of the above embodiments, the rotary compressor provided with a pair of detection electrodes for the bearing is exemplified. However, the present invention provides a rotary compressor provided with three or more pairs of detection electrodes. Can also be applied.

  In each of the above embodiments, the rotary compressor in which the pair of detection electrodes are exposed from the insulating layer is illustrated, but the present invention can also be applied to a rotary compressor in which the pair of detection electrodes are embedded in the insulating layer. it can.

  In each of the above embodiments, a rotary compressor provided with an annular detection electrode has been illustrated, but the present invention can also be applied to a rotary compressor provided with a pin-shaped detection electrode. When pin-shaped detection electrodes are provided, the pair of detection electrodes may be provided along the circumferential direction as well as the axial direction of the drive shaft.

  Moreover, in each said embodiment, although the scroll compressor was illustrated as a rotary compressor, this invention is applicable also to a rotary compressor etc.

  In addition, said each embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, since the wear of the bearing is reliably detected, the present invention is useful for a rotary compressor including a drive shaft and a bearing that slidably supports the drive shaft.

1 Back metal (plate member)
3 Electrode members 3a to 3f Detection electrode 4 Insulating layer 5 Molded body 10 Scroll compressor (rotary compressor)
23 Drive shaft 30 Compression mechanism 50 Housing 53a, 53b Bearing

Claims (5)

A drive shaft (23) for driving the compression mechanism (30);
A rotary compressor provided with a bearing (53a, 53b) provided around the drive shaft (23) and slidably supporting the drive shaft (23);
On the inner peripheral side of the bearings (53a, 53b), the electrode surface on the inner peripheral side is arranged at a position offset by a predetermined amount outside the sliding surface (F) with the drive shaft (23), A rotary compressor characterized by being provided with a pair of detection electrodes (3a to 3f) that are electrically connected to each other via the drive shaft (23) to detect wear. In claim 1,
A plurality of pairs of the detection electrodes (3c to 3f) are provided, and the amount of offset for each pair is different from each other. In claim 1 or 2,
The pair of detection electrodes (3a to 3f) is provided along the axial direction of the drive shaft (23). In claim 3,
Each said detection electrode (3a-3f) is formed in the annular | circular shape, The rotary compressor characterized by the above-mentioned. A method of manufacturing a bearing (53a, 53b) provided around a drive shaft (23) for driving the compression mechanism (30) and slidably supporting the drive shaft (23),
After forming a pair of electrode members (3, 3) made of conductive resin on the plate-like member (1), an insulating layer (4) made of non-conductive resin so as to cover the pair of electrode members (3, 3) ) To form a laminate on the entire surface;
After the plate-like member (1) on which the insulating layer (4) is formed is formed into a cylindrical shape so that the insulating layer (4) side is inside, a molded body (5) is produced, and then the molded body (5 ) Is fixed to the inner peripheral surface of the housing (50) formed with the inner peripheral surface;
After turning the entire surface layer of the insulating layer (4) in the molded body (5) fixed to the housing (50) to form a sliding surface (F) with the drive shaft (23), the pair of electrodes A position where the surface layer of the pair of electrode members (3, 3) is turned by turning a portion corresponding to the member (3, 3), and is offset by a predetermined amount outside the sliding surface (F). And a turning process for forming a pair of detection electrodes (3a to 3f) for detecting wear by being electrically connected to each other via the drive shaft (23). .

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