Scroll compressor

Abstract

To provide a scroll-type compressor that improves the ease of assembly of the orbiting scroll and prevents malfunctions that may occur in the orbiting scroll due to the rotation prevention mechanism. [Solution] In the scroll compressor 1, the rotation prevention mechanism 80 that prevents the rotation of the orbiting scroll 52 includes a plurality of circular recesses 81 formed on the back surface of the orbiting end plate 521 of the orbiting scroll 52, and a plurality of pins 82 protruding from a support surface 135 that supports the back surface of the orbiting end plate 521 of the orbiting scroll 52, with the tip of each of the plurality of pins 82 and its vicinity positioned in the corresponding circular recess 81 among the plurality of circular recesses 81. Each of the plurality of circular recesses 81 is subjected to a surface hardening treatment such that at least the inner surface has a surface hardness equivalent to or higher than that of the pins 82.

Description

Technical Field

[0001] The present invention relates to a scroll compressor.

Background Art

[0002] A scroll compressor usually has a rotation prevention mechanism for preventing the rotation of the orbiting scroll, and a pin-ring type rotation prevention mechanism is often adopted as the rotation prevention mechanism. The pin-ring type rotation prevention mechanism includes a plurality of pins protruding from one of the back surface of the end plate of the orbiting scroll and the surface supporting the back surface of the end plate of the orbiting scroll, and a plurality of rings corresponding to the plurality of pins, and the plurality of rings are fitted into a plurality of ring holes formed in the other of the back surface of the end plate of the orbiting scroll and the surface supporting the back surface of the end plate of the orbiting scroll.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the pin-ring type rotation prevention mechanism has the following problems. For example, when each ring is loosely fitted into the corresponding ring hole, it is necessary to assemble the orbiting scroll so that the ring does not come off from the ring hole, and the assembling property of the orbiting scroll is not good. On the other hand, when each ring is press-fitted into the corresponding ring hole, there is a risk that the ring is deformed during the press-fitting into the ring hole, leading to a decrease in the durability of the rotation prevention mechanism. In addition, especially when the ring is press-fitted into the ring hole formed in the back surface of the end plate of the orbiting scroll, not only the ring is deformed but also the end plate of the orbiting scroll may be deformed during the press-fitting of the ring into the ring hole.

[0005] The present invention aims to provide a scroll-type compressor that improves the ease of assembly of the orbiting scroll and prevents malfunctions that may occur in the orbiting scroll due to the rotation prevention mechanism. [Means for solving the problem]

[0006] According to one aspect of the present invention, a scroll compressor includes a fixed scroll, an orbiting scroll that performs orbital motion relative to the fixed scroll, and a rotation-preventing mechanism that prevents the orbiting scroll from rotating. The rotation-preventing mechanism includes a plurality of circular recesses formed on the back surface of the end plate of the orbiting scroll, and a plurality of pins protruding from a support surface that supports the back surface of the end plate of the orbiting scroll, the tip of each pin and its vicinity positioned within the corresponding circular recess. Each of the plurality of circular recesses is surface-hardened such that at least the inner surface has a hardness equivalent to or higher than that of the plurality of pins. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a scroll-type compressor that improves the ease of assembly of the orbiting scroll and prevents malfunctions that may occur in the orbiting scroll due to the rotation prevention mechanism. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view showing the schematic configuration of a scroll-type compressor according to an embodiment. [Figure 2] This is an enlarged view of the main part of Figure 1. [Figure 3] This is a view of the orbiting scroll from the back side of the orbiting end plate. [Figure 4] This figure shows an example of the extent of surface hardening treatment applied to the back surface of the orbiting end plate of an orbiting scroll. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments of the present invention will be described based on the attached drawings.

[0010] Figure 1 is a cross-sectional view showing a schematic configuration of a scroll compressor according to an embodiment of the present invention. The scroll compressor 1 according to this embodiment constitutes a part of the refrigerant circuit of a vehicle air conditioning system that is mounted in a vehicle and air-conditions the interior of the vehicle, and is configured to inhale and compress a refrigerant (gaseous refrigerant) and discharge the compressed refrigerant.

[0011] Referring to Figure 1, the scroll compressor 1 comprises a housing 10, a rotating shaft 20, a motor 30, an inverter 40, and a scroll unit 50. The rotating shaft 20, motor 30, inverter 40, and scroll unit 50 are housed in the housing 10.

[0012] The housing 10 is made of, for example, an aluminum alloy. In this embodiment, the housing 10 includes a front housing 11, a cover member 12, a center housing 13, and a rear housing 14. These front housing 11, cover member 12, center housing 13, and rear housing 14 are fastened together by bolts (not shown) to form the housing 10 of the scroll compressor 1.

[0013] The front housing 11 extends in the front-rear direction and is formed as a hollow body with openings at its front and rear ends. Specifically, the front housing 11 has a cylindrical body portion 111 having a generally circular cross-section and a non-circular body portion 112 having a non-circular cross-section. The non-circular body portion 112 is positioned in front of the cylindrical body portion 111, and the cross-section of the non-circular body portion 112 is larger than that of the cylindrical body portion 111. The internal space of the cylindrical body portion 111 and the internal space of the non-circular body portion 112 are separated by a first partition wall portion 113. The motor 30 is housed in the cylindrical body portion 111, and the inverter 40 is housed in the non-circular body portion 112.

[0014] The first bulkhead portion 113 of the front housing 11 is provided with a shaft support portion 114 that supports the front end of the rotating shaft 20. The shaft support portion 114 protrudes cylindrically from the center (it does not need to be exactly in the center, but approximately in the center) of the rear surface of the first bulkhead portion 113, that is, into the cylindrical body portion 111, and rotatably supports the portion near the front end of the rotating shaft 20 via a first bearing 21 mounted thereon.

[0015] The cover member 12 closes the opening at the front end of the front housing 11, that is, the opening of the non-circular body portion 112 in which the inverter 40 is housed.

[0016] The center housing 13 extends in the front-rear direction and is formed in a cylindrical shape corresponding to the cylindrical body portion 111 of the front housing 11, and is located behind the front housing 11. The internal space of the center housing 13 is divided into a front space and a rear space by a second partition portion 131. The front space forms a single space together with the space within the cylindrical body portion 111 of the front housing 11, and the scroll unit 50 is housed in the rear space.

[0017] The second partition portion 131 of the center housing 13 has a hollow protruding portion 132 that protrudes forward, more specifically, into the front housing 11. The hollow protruding portion 132 is formed in a bottomed cylindrical shape with an opening facing rearward. The top portion (bottom of the bottomed cylinder) 133 of the hollow protruding portion 132 is formed flat and faces the shaft support portion 114 provided on the first partition portion 113 of the front housing 11. A through hole 134 through which the rotating shaft 20 passes is provided in the top portion 133 of the hollow protruding portion 132. The through hole 134 is formed in a circular shape having a diameter slightly larger than the outer diameter of the rotating shaft 20 so that a minute gap is formed between the inner peripheral surface of the through hole 134 and the outer peripheral surface of the rotating shaft 20 passing through the through hole 134. Inside the hollow protruding portion 132, a second bearing 22 that rotatably supports a portion near the rear end of the rotating shaft 20 that has passed through the through hole 134 is mounted. That is, in the present embodiment, the rotating shaft 20 extends in the front-rear direction within the housing 10 and is rotatably supported by a first bearing 21 provided on the front housing 11 and a second bearing 22 provided on the center housing 13.

[0018] The rear housing 14 is formed in a bottomed cylindrical shape corresponding to the center housing 13 and is disposed on the rear side of the center housing 13 with the opening facing forward.

[0019] Although not shown, seal members such as gaskets can be appropriately arranged between the front housing 11 and the cover member 12, between the front housing 11 and the center housing 13, and between the center housing 13 and the rear housing 14.

[0020] The motor 30 is, for example, a three-phase synchronous motor. The motor 30 includes a stator 31 fixed to the inner peripheral surface of the cylindrical body portion 111 of the front housing 11 and a rotor 32 disposed with a predetermined gap inside the stator 31 in the radial direction and integrated with the rotating shaft 20. The motor 30 is configured such that the rotor 32 rotates by power supply from the inverter 40, thereby rotating the rotating shaft 20.

[0021] The inverter 40 includes a plurality of switching elements (not shown). The inverter 40 is configured to convert DC power from a battery (not shown) of the vehicle into three-phase AC power and supply this three-phase AC power to the motor 30 via a power supply line (not shown) that extends through the first partition wall portion 113, thereby driving the motor 30.

[0022] The scroll unit 50 includes a fixed scroll 51 and a orbiting scroll 52 that performs a revolving and orbiting motion with respect to the fixed scroll 51. The fixed scroll 51 and the orbiting scroll 52 are formed of, for example, an aluminum alloy, similar to the housing 10.

[0023] The fixed scroll 51 has a disk-shaped end plate (hereinafter referred to as the "fixed end plate") 511 and a spiral wall (hereinafter referred to as the "fixed spiral wall") 512 formed on one surface of the fixed end plate 511. The fixed spiral wall 512 extends in a spiral shape (involute curve shape) from the radially inner end portion (starting winding portion) to the radially outer end portion (ending winding portion) on the one surface of the fixed end plate 511. The fixed scroll 51 is fixed with the outer edge portion (peripheral portion) of the fixed end plate 511 sandwiched and held between the center housing 13 and the rear housing 14 in a state where the one surface of the fixed end plate 511 (the surface on which the fixed spiral wall 512 is formed) faces forward.

[0024] The orbiting scroll 52 has a disc-shaped end plate (hereinafter referred to as "orbiting end plate") 521, a spiral wall (hereinafter referred to as "orbiting spiral wall") 522 formed on one surface of the orbiting end plate 521, and a cylindrical portion 523 projecting from the other surface of the orbiting end plate 521. The cylindrical portion 523 protrudes from the center (it does not need to be exactly in the center, but approximately in the center) of the other surface of the orbiting end plate 521. The orbiting spiral wall 522 extends along the one surface of the orbiting end plate 521 in a spiral shape (involute curve shape) from the radially inward inner end (start of winding) to the radially outward outer end (end of winding). The orbiting scroll 52 is arranged such that the orbiting spiral wall 522 engages with the fixed spiral wall 512 of the fixed scroll 51. In other words, the orbiting scroll 52 is positioned between the second partition wall 131 of the center housing 13 and the fixed scroll 51, with one of the orbiting end plates 521 (the surface on which the orbiting spiral wall 522 is formed) facing backward.

[0025] Furthermore, the other surface of the swivel end plate 521 (the surface on which the cylindrical portion 523 is formed) is supported via a plate member 23 by a support surface 135 formed on the second partition wall portion 131 of the center housing 13. The plate member 23 is formed in an annular shape and is positioned radially outward of the cylindrical portion 523 formed on the back surface of the swivel end plate 521. In the following, the other surface of the swivel end plate 521, that is, the surface opposite to the one surface facing the fixed scroll 51, on which the cylindrical portion 523 is formed, will be referred to as the "back surface" of the swivel scroll 52.

[0026] The orbiting scroll 52 is driven by the rotation of the rotation shaft 20. Specifically, the orbiting scroll 52 is driven by a driving force transmitted via the rotation shaft 20 and the conversion mechanism 70. The conversion mechanism 70 is configured to convert the rotational motion of the rotation shaft 20 into the orbital motion of the orbiting scroll 52 relative to the fixed scroll 51. Furthermore, the rotation of the orbiting scroll 52 is prevented by the rotation prevention mechanism 80. In other words, the orbiting scroll 52 is configured to perform orbital motion relative to the fixed scroll 51 while being driven by the rotation of the rotation shaft 20 and with its rotation prevented by the rotation prevention mechanism 80.

[0027] The scroll unit 50 is configured such that the orbiting scroll 52 is driven by the rotation of the rotation axis 20, causing the orbiting scroll 52 to perform an orbital motion relative to the fixed scroll 51, thereby taking in refrigerant, compressing the taken-in refrigerant, and discharging the compressed refrigerant.

[0028] Figure 2 is an enlarged view of the main part of Figure 1.

[0029] Referring to Figure 2, the conversion mechanism 70 is positioned radially inward of a cylindrical portion 523 formed on the back surface of the orbiting end plate 521 of the orbiting scroll 52. The conversion mechanism 70 includes an eccentric pin 71 and an eccentric bush 72. The eccentric pin 71 extends from the rear end face of the rotating shaft 20 in the axial direction of the rotating shaft 20. The axis of the eccentric pin 71 is offset from the axis of the rotating shaft 20. The eccentric bush 72 is rotatably attached to the eccentric pin 71 and its rear end is rotatably inserted into the cylindrical portion 523 formed on the back surface of the orbiting end plate 521 of the orbiting scroll 52 via a bearing 73. A balancer 74 is attached to the outer circumferential surface of the front end of the eccentric bush 72. The balancer 74 is provided to counteract the centrifugal force generated in the orbiting scroll 52 by the orbital motion of the orbiting scroll 52 relative to the fixed scroll 51, and to maintain an appropriate pressing force of the orbiting spiral wall 522 against the fixed spiral wall 512.

[0030] Referring to Figure 2, the rotation prevention mechanism 80 includes a plurality of substantially cylindrical recessed areas (hereinafter referred to as "circular recesses") 81 formed on the back surface of the orbiting end plate 521 of the orbiting scroll 52, and a plurality of pins 82 provided on the support surface 135 of the second partition wall portion 131 of the center housing 13. The number of circular recesses 81 and the number of pins 82 are the same.

[0031] Figure 3 shows the orbiting scroll 52 as viewed from the rear side of the orbiting end plate 521.

[0032] Referring to Figure 3, in this embodiment, a plurality (six in this case) of circular recesses 81 are formed on the orbiting end plate 521 of the orbiting scroll 52 at equal intervals in the circumferential direction on the radially outer side of the cylindrical portion 523 on the back surface. In addition, weight-reducing holes 525 are formed in each of the inter-recess region 524 between two adjacent circular recesses 81 on the back surface of the orbiting end plate 521 of the orbiting scroll 52. The weight-reducing holes 525 are provided to reduce the weight of the orbiting scroll 52, balance its weight, and / or stabilize its shape.

[0033] Each of the multiple (in this case, six) pins 82 is made of, for example, bearing steel and is attached and fixed to a pin hole formed in the support surface 135 so as to protrude rearward from the support surface 135. The multiple pins 82 extend through the plate member 23, and as shown by the dashed lines in Figure 3, the tip of each of the multiple pins 82 and its vicinity are positioned within the corresponding circular recess 81 of the multiple circular recesses 81.

[0034] In the rotation-preventing mechanism 80, the rotation of the orbiting scroll 52 is prevented by each pin 82 contacting the inner surface (inner circumferential surface) of the corresponding circular recess 81, and the orbiting scroll 52 is able to perform orbital motion as each pin 82 moves along the inner surface (inner circumferential surface) of the corresponding circular recess 81. In this way, the rotation-preventing mechanism 80 prevents the rotation of the orbiting scroll 52 while allowing the orbital motion of the orbiting scroll 52, thereby enabling the orbiting scroll 52 to perform orbital motion relative to the fixed scroll 51.

[0035] In this embodiment, the surface hardness of the inner surface of the circular recess 81 is lower than that of the pin 82. Therefore, contact between the inner surface of the circular recess 81 and the pin 82, and movement of the pin 82 while in contact with the inner surface of the circular recess 81, may cause damage or wear to the inner surface of the circular recess 81. To address this, in this embodiment, each of the multiple circular recesses 81 formed on the back surface of the orbiting end plate 521 of the orbiting scroll 52 is subjected to a surface hardening treatment such that at least the inner surface that the pin 82 contacts has a surface hardness equivalent to or higher than that of the pin 82. In this embodiment, as shown by hatching in Figure 4, the surface hardening treatment is applied to the portion of the back surface of the orbiting end plate 521 of the orbiting scroll 52 other than the cylindrical portion 523.

[0036] The surface hardening treatment may be, for example, hard chrome plating. Also, although not particularly limited, the surface hardness of the inner surface of each circular recess 81 after the surface hardening treatment may be in the range of ±10% of the surface hardness of the pin 82, or in the range of -5% to +15% of the surface hardness of the pin 82. For example, if the surface hardness of the pin 82 is HV700 to 840, the surface hardness of the inner surface of each circular recess 81 after the surface hardening treatment may be around HV800.

[0037] Returning to Figure 1, in this embodiment, the scroll compressor 1 has an intake chamber H1, a compression chamber H2, a discharge chamber H3, a gas-liquid separation chamber H4, and a back pressure chamber H5.

[0038] The intake chamber H1 is formed by the internal space of the cylindrical body portion 111 of the front housing 11 and the front space of the center housing 13. An intake port P1 is formed in the peripheral wall of the cylindrical body portion 111 of the front housing 11. The intake port P1 is connected to the refrigerant circuit via a connecting pipe (not shown), and refrigerant is drawn into the intake chamber H1 from the refrigerant circuit via the connecting pipe and the intake port P1. The center housing 13 has a refrigerant passage L1 formed therein for guiding the refrigerant in the intake chamber H1 to the space radially outside the scroll unit 50.

[0039] The compression chamber H2 is formed between the fixed scroll 51 and the orbiting scroll 52. Specifically, in the scroll unit 50, when the orbiting scroll 52 performs an orbital motion relative to the fixed scroll 51, the orbiting spiral wall 522 comes into contact with the fixed spiral wall 512, forming a sealed space radially outward. This sealed space then moves radially inward, gradually decreasing in volume. This sealed space formed between the fixed scroll 51 and the orbiting scroll 52 is the compression chamber H2. The scroll unit 50 is configured to take in refrigerant radially outward when the compression chamber H2 (i.e., the sealed space) is formed, and compress the refrigerant as the compression chamber H2 moves radially inward.

[0040] The discharge chamber H3 is formed in the rear housing 14. Furthermore, a discharge hole L2 is formed approximately in the radial center of the fixed end plate 511 of the fixed scroll 51, connecting the compression chamber H2, which has moved most radially inward, with the discharge chamber H3. The refrigerant compressed in the compression chamber H2 of the scroll unit 50 is discharged into the discharge chamber H3 through the discharge hole L2. A reed valve 24 is attached to the discharge hole L2, which allows the flow of refrigerant from the compression chamber H2 to the discharge chamber H3, but restricts the flow of gaseous refrigerant from the discharge chamber H3 to the compression chamber H2.

[0041] The gas-liquid separation chamber H4 is located in the rear housing 14. The gas-liquid separation chamber H4 is located behind the discharge chamber H3 and communicates with the discharge chamber H3 via a communication hole L3. An oil separator 25 is positioned in the gas-liquid separation chamber H4 to separate the lubricating oil contained in the refrigerant compressed in the compression chamber H2. A discharge port P2 is provided above the oil separator 25 in the gas-liquid separation chamber H4. The discharge port P2 is connected to the refrigerant circuit via a connecting pipe (not shown) or the like.

[0042] The back pressure chamber H5 is located on the rear side of the orbiting end plate 521 of the orbiting scroll 52. Specifically, the back pressure chamber H5 is formed between the orbiting end plate 521 of the orbiting scroll 52 and the second partition wall portion 131 of the center housing 13. The back pressure chamber H5 includes the internal space of the hollow projection 132 of the second partition wall portion 131. The back pressure chamber H5 communicates with the intake chamber H1 through a minute gap between the inner circumferential surface of the through hole 134 formed at the top of the hollow projection 132 of the second partition wall portion 131 and the outer circumferential surface of the rotating shaft 20.

[0043] The center housing 13 and the rear housing 14 have a lubricating oil passage L4 that connects the discharge chamber H3 and the back pressure chamber H5, and also connects the gas-liquid separation chamber H4 and the back pressure chamber H5. An orifice (throttling section) OL is positioned in the middle of the lubricating oil passage L4.

[0044] In the scroll compressor 1 configured as described above, when the motor 30 rotates the rotating shaft 20 by power supplied from the inverter 40, the rotation of the rotating shaft 20 is transmitted to the orbiting scroll 52 via the conversion mechanism 70, and the orbiting scroll 52 performs an orbital orbital motion relative to the fixed scroll 51 while its rotation is prevented by the rotation prevention mechanism 80. Then, low-pressure refrigerant is drawn from the refrigerant circuit into the intake chamber H1 via the intake port P1. The refrigerant drawn into the intake chamber H1 passes through the refrigerant passage L1 to the space radially outside the scroll unit 50, and is taken into the compression chamber H2 formed between the fixed scroll 51 and the orbiting scroll 52 and compressed. The high-pressure refrigerant compressed in the compression chamber H2 is discharged into the discharge chamber H3 via the discharge port L2 and the reed valve 24, and flows into the gas-liquid separation chamber H4 via the communication port L3. The lubricating oil contained in the refrigerant that flows into the gas-liquid separation chamber H4 is separated by the oil separator 25. Then, the refrigerant, after the lubricating oil has been separated, is discharged from the outlet P2 and guided to the refrigerant circuit.

[0045] The lubricating oil separated from the refrigerant by the oil separator 25 is stored at the bottom of the gas-liquid separation chamber H4. In addition, a portion of the lubricating oil contained in the refrigerant discharged into the discharge chamber H3 is stored at the bottom of the discharge chamber H3. In this embodiment, the discharge chamber H3 and the gas-liquid separation chamber H4 are connected to the back pressure chamber H5 via the lubricating oil passage L4, and the back pressure chamber H5 is connected to the suction chamber H1 via a minute gap between the inner surface of the through hole 134 and the rotating shaft 20. Therefore, the lubricating oil stored at the bottom of the discharge chamber H3 and / or the lubricating oil stored at the bottom of the gas-liquid separation chamber H4 are supplied to the back pressure chamber H5 via the lubricating oil passage L4, and further supplied to the suction chamber H1. The refrigerant supplied to the suction chamber H1 is taken into the compression chamber H2 together with the low-pressure refrigerant drawn into the suction chamber H1. This ensures the lubrication of each sliding part within the housing 10.

[0046] Furthermore, a portion of the high-pressure refrigerant in the discharge chamber H3 and / or the high-pressure refrigerant in the gas-liquid separation chamber H4 is supplied to the back pressure chamber H5 via a lubricating oil passage L4 having an orifice (throttling section) OL, and the pressure in the back pressure chamber H5 is maintained at an intermediate pressure (back pressure) between the pressure in the suction chamber H1 and the pressure in the discharge chamber H3 (gas-liquid separation chamber H4). When the refrigerant is compressed, a compressive reaction force acts on the orbiting scroll 52 in a direction that separates the orbiting scroll 52 from the fixed scroll 51, but the intermediate pressure (back pressure) also acts to counteract this compressive reaction force. As a result, the orbiting scroll 52 is prevented from being pressed against the support surface 135 with excessive force, a stable orbital motion of the orbiting scroll 52 is obtained, and the contact between the fixed spiral wall 512 and the orbiting end plate 521 and the contact between the orbiting spiral wall 522 and the fixed end plate 511 can be properly maintained.

[0047] Furthermore, in the rotation prevention mechanism 80 of this embodiment, each of the multiple circular recesses 81 is subjected to a surface hardening treatment such that at least the inner surface has a surface hardness equivalent to or higher than that of the multiple pins 82. Specifically, in this embodiment, each of the multiple pins 82 is formed from bearing steel, and hard chrome plating is used as the surface hardening treatment. Therefore, damage or wear to the inner surface of the circular recess 81 is prevented from occurring due to contact between the inner surface of the circular recess 81 and the pins 82, and the movement of the pins 82 while they are in contact, and smooth sliding of the pins 82 against the inner surface of the circular recess 81 can be ensured over a long period of time.

[0048] Furthermore, unlike the pin-ring type rotation-preventing mechanism, the rotation-preventing mechanism 80 of this embodiment does not use a ring that is fitted into a ring hole. As a result, the number of parts in the rotation-preventing mechanism 80 is reduced, and the ease of assembly of the orbiting scroll 52 can be improved. In addition, since it is not necessary to attach parts to the orbiting end plate 521 of the orbiting scroll 52 by press-fitting or the like in order to provide the rotation-preventing mechanism 80, problems that may occur in the orbiting scroll 52 due to the rotation-preventing mechanism (deformation of the ring or deformation of the orbiting end plate 521) can be prevented.

[0049] Furthermore, in the above-described embodiment, the surface hardening treatment is applied to the portion of the back surface of the orbiting end plate 521 of the orbiting scroll 52 other than the cylindrical portion 523. Therefore, damage or wear on the back surface of the orbiting end plate 521 is prevented, and smooth sliding of the orbiting end plate 521 with respect to the plate member 23 can also be ensured.

[0050] In the above-described embodiment, the pin 82 is formed from bearing steel, and hard chrome plating is used as the surface hardening treatment. However, it is not limited to this. At least the inner surfaces of the multiple circular recesses 81 are to have the same surface hardness as or higher than that of the multiple pins 82, as long as each of the multiple circular recesses 81 is treated with a surface hardening treatment. The material of the pins 82 and the type of surface hardening treatment can be arbitrarily selected.

[0051] Furthermore, in the above-described embodiment, the surface hardening treatment is applied to the portion of the back surface of the orbiting end plate 521 of the orbiting scroll 52 other than the cylindrical portion 523. However, it is not limited to this. It is sufficient that the surface hardening treatment is applied to the inner surfaces of at least a plurality of circular recesses 81, and the surface hardening treatment may be applied only to the inner surface of each circular recess 81 on the back surface of the orbiting end plate 521, or only to the surface (inner surface and inner bottom surface) of each circular recess 81.

[0052] Furthermore, in the above-described embodiment, weight-reducing holes 525 are formed in all inter-recess regions 524. However, this is not limited to this. It is sufficient that weight-reducing holes 525 are formed in at least one inter-recess region 524. Also, the shape of the weight-reducing holes 525 can be arbitrarily set.

[0053] Although embodiments and modifications thereof of the present invention have been described above, the present invention is not limited to the embodiments and modifications described above, and further modifications and changes are possible based on the technical concept of the present invention. [Explanation of Symbols]

[0054] 1...Scroll compressor, 10...Housing, 20...Rotating shaft, 21...First bearing, 22...Second bearing, 23...Plate member, 30...Motor, 40...Inverter, 50...Scroll unit, 51...Fixed scroll, 52...Orbiting scroll, 70...Conversion mechanism, 80...Rotation prevention mechanism, 81...Circular recess, 82...Pin, 135...Support surface, 511...Fixed end plate, 512...Fixed spiral wall, 521...Orbiting end plate, 522...Orbiting spiral wall, 523...Cylindrical section, 524...Area between recesses, 525...Weight-reducing holes, H1...Intake chamber, H2...Compression chamber, H3...Discharge chamber, H4...Gas-liquid separation chamber, H5...Back pressure chamber, P1...Intake port, P2...Discharge port

Claims

1. Fixed scrolling and, A revolving scroll that performs orbital motion relative to the fixed scroll, A rotation-preventing mechanism for preventing the rotation of the orbiting scroll, A scroll compressor including, The aforementioned rotation prevention mechanism is Multiple circular recesses formed on the back surface of the end plate of the orbital scroll, A plurality of pins protruding from a support surface that supports the back surface of the end plate of the orbital scroll, wherein the tip of each pin and its vicinity are arranged in a corresponding circular recess among a plurality of circular recesses, Includes, Each of the plurality of circular recesses is subjected to a surface hardening treatment such that at least its inner surface has a surface hardness equivalent to or higher than that of the plurality of pins. Scroll compressor.

2. The aforementioned scroll compressor is A rotating shaft that is supported to rotate freely, A motor that rotates the aforementioned rotating shaft, A conversion mechanism that converts the rotation of the rotation axis into the orbital motion of the orbital scroll relative to the fixed scroll, comprising a conversion mechanism positioned radially inward of a cylindrical portion protruding from the back surface of the end plate of the orbital scroll, It further includes, The plurality of circular recesses are arranged at equal intervals in the circumferential direction on the radially outer side of the cylindrical portion on the back surface of the end plate of the orbiting scroll, A weight-reducing hole is formed in at least one of the inter-recess regions between two adjacent circular recesses on the back surface of the end plate of the orbital scroll. The surface hardening treatment is applied to the portion of the back surface of the end plate of the orbital scroll other than the cylindrical portion. The scroll compressor according to claim 1.

3. Each of the plurality of pins is formed of bearing steel and attached to the support surface. The aforementioned surface hardening treatment is hard chrome plating. A scroll compressor according to claim 1 or 2.

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