JP2004293533A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to ensure smooth lubrication of end plate surfaces in a scroll compressor through adoption of a simple structure and to prevent the cut-off or baking on end plate surfaces by lowering sliding surface pressure. <P>SOLUTION: The scroll compressor 1 is equipped with a fixed scroll 100 made of a spiral-shaped lap 102 erected on a board 101; with a revolving scroll 200 made of a spiral shaped lap 202 erected on a board 201, and arranged to revolve in engagement with the fixed scroll 100 so as to form a compression chamber 130; and with an external circumference space 411 in which a pressure lower than the discharge pressure prevails, and to which oil is supplied outside the revolving scroll 200. The fixed scroll 100 has, on the external circumference side of the compression chamber 130, a end plate surface 105 to which the board 201 for the revolving scroll 200 touches. Further on the end plate surface, a closed oil supply groove 106 is formed with one of the ends linked to the external space 411 and another end extending to the circumference direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a scroll compressor, and more particularly to a scroll compressor suitable as a refrigerant compressor for refrigeration and air conditioning, and an air or other gas compressor.
[0002]
[Prior art]
A conventional scroll compressor is disclosed in Japanese Patent Application Laid-Open No. 55-160193 (Patent Document 1). The scroll compressor includes a wrap around the outermost periphery of a compression chamber of a fixed scroll, and a mirror plate surface on the outer peripheral side of which the base plate of the orbiting scroll comes in contact with the outermost periphery. A plurality of oil supply grooves extending in the direction are provided, an oil supply hole is formed through the fixed scroll so as to communicate with each oil supply groove from the rear side (opposite the lap side), and oil is supplied from the oil supply hole. It is. As a result, the lubricating properties of the outer peripheral portions of the fixed scroll and the orbiting scroll are improved, and the confidentiality and reliability are improved.
[0003]
As a conventional scroll compressor, there is one disclosed in Japanese Patent Application Laid-Open No. Sho 59-110883 (Patent Document 2). This scroll compressor has a back pressure chamber that has an intermediate pressure on the outer peripheral side of the orbiting scroll and is supplied with oil, and the width of the mirror plate surface where the base plate of the orbiting scroll comes in contact with the outside of the wrap of the fixed scroll has a turning radius. It is as follows. By this, the sliding surface between the fixed scroll of the orbiting scroll and the seat surface of the orbiting scroll is put out to the back pressure chamber, and the half of the one revolution of the differential movement can be wetted with oil so that the seat surface can be refueled. It is.
[0004]
[Patent Document 1]
JP-A-55-160193 (FIGS. 3 and 4)
[Patent Document 2]
JP-A-59-110883 (FIG. 2)
[0005]
[Problems to be solved by the invention]
However, the scroll compressor disclosed in Patent Literature 1 has a structure in which an oil supply hole for supplying oil from the rear side is provided in an oil supply groove, so that there is a problem that the structure is complicated and expensive.
[0006]
Further, in the scroll compressor of Patent Document 2, since the width of the end plate surface of the fixed scroll is narrow, the surface pressure of the sliding surface is increased, and there is a problem that galling and seizure are likely to occur.
[0007]
An object of the present invention is to be able to reliably lubricate the end plate surface on the outer periphery of the fixed scroll with a simple structure, to reduce the sliding surface pressure and to prevent galling and seizure of the end plate surface, An object of the present invention is to obtain a scroll compressor which is inexpensive and has excellent reliability.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a scroll compressor according to the present invention has a fixed scroll in which a spiral wrap is erected on a base plate, and a spiral wrap is erected on a base plate, and a compression chamber is formed. An orbiting scroll that engages with the fixed scroll and orbits, and an outer peripheral space that has a pressure lower than a discharge pressure and is supplied with oil outside the orbiting scroll. Side has a mirror plate surface with which the base plate of the orbiting scroll comes into contact, and has an oil supply groove communicating with the outer peripheral space on one side and a closed passage extending in the circumferential direction on the other side. I did it.
[0009]
And, more preferably, the radial width from the inner circumference to the outer circumference of the end surface of the fixed scroll is set to be larger than twice the turning radius of the orbiting scroll. Preferably, a plurality of the oil supply grooves are provided, and the plurality of oil supply grooves are formed so as to have a plurality of portions in the radial direction. Preferably, the width of the mirror plate surface between the oil supply groove and the compression chamber is set to be equal to or less than twice the turning radius of the orbiting scroll. Preferably, the oil supply groove is formed so as to extend in an arc from the outer peripheral side to the inner peripheral side. Preferably, a direction extending from one side of the oil supply groove to the other side is the same as a turning direction of the orbiting scroll.
[0010]
Further, the scroll compressor according to the present invention includes a fixed scroll having a spiral wrap standing on a base plate, and a spiral wrap standing on a base plate, and the fixed scroll having a spiral wrap on the base plate to form a compression chamber. An orbiting scroll that meshes and orbits, a rotating shaft that drives the orbiting scroll and has an oil passage, a sealed container having an oil reservoir at the bottom, and a discharge pressure and a suction pressure on the back side of the orbiting scroll. And a back-pressure chamber in which the oil of the oil sump is supplied through an oil passage of the rotating shaft, and the fixed scroll has a wrap that forms the outermost periphery of the compression chamber, A refueling system having a mirror plate surface with which the base plate of the orbiting scroll contacts, and having one side communicating with the space on the outer peripheral side of the orbiting scroll and the other side as a closed passage extending in the circumferential direction. Certain that provided on the end plate surface of the fixed scroll.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a scroll compressor according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
[0012]
First, the overall structure of a scroll compressor according to an embodiment of the present invention will be described with reference to FIG.
[0013]
The scroll compressor 1 includes a compression mechanism 2 and a driving unit 3 housed in a closed container 700. In this embodiment, the compression mechanism 2, the drive unit 3, and the oil sump 730 are arranged in this order from the top, and the vertical scroll compression in which the compression mechanism 2 and the drive unit 3 are connected via the rotating shaft 300. Machine.
[0014]
The compression mechanism unit 2 includes a fixed scroll 100, an orbiting scroll 200, and a frame 400 as basic elements. The frame 400 is fixed to the closed casing 700 and constitutes a member on which the rolling bearing 401 is provided. The fixed scroll 100 includes a base plate 101, a spiral wrap 102, a suction port 103, and a discharge port 104 as basic components, and is fixed to a frame 400 via bolts. The wrap 102 is erected vertically on one side of the base plate 101. The orbiting scroll 200 includes a base plate 201, a spiral wrap 202, a boss 203, and a back pressure hole 204 as basic components. The wrap 202 stands upright on one side of the base plate 201. The boss 203 is formed so as to protrude perpendicularly to the other side (opposite the lap side) of the base plate 201.
[0015]
The compression chamber 130 formed by meshing the fixed scroll 100 and the orbiting scroll 200 performs a compression operation in which the volume is reduced by the orbiting movement of the orbiting scroll 200. In this compression operation, the working fluid is sucked into the compression chamber 130 via the suction port 103 along with the orbiting movement of the orbiting scroll 200, and the sucked working fluid passes through the compression stroke from the discharge port 104 of the fixed scroll 100. The liquid is discharged into the closed container 700, and further discharged from the closed container 700 via the discharge pipe 701. Thereby, the space in the sealed container 700 is maintained at the discharge pressure. An injection pipe 712 is provided in the compression chamber 130 so as to be communicated via a valve.
[0016]
The sealed container 700 has an upper cap 710 and a lower cap 720. A leg 721 is attached to the bottom surface of the sealed container 700. Further, a hermetic terminal 702 is provided on a side surface of the sealed container 700 so that electric power can be supplied to the motor unit 600.
[0017]
The driving unit 3 for orbiting the orbiting scroll 200 includes an electric motor unit 600 including a stator 601 and a rotor 602, a rotating shaft 300, an Oldham coupling 500 which is a main component of a rotation preventing mechanism of the orbiting scroll 200, a frame 400, The rolling bearings 401 and 803 and the boss 203 are configured as basic elements.
[0018]
The rotating shaft 300 includes a main shaft portion 302 and a crank pin 301 integrally. The rolling bearings 401 and 803 constitute a main shaft supporting portion that rotatably engages with the main shaft portion 302 of the rotating shaft 300. The boss 203 is provided on the orbiting scroll 200 so as to movably and rotatably engage the crankpin 301 of the rotating shaft 300 in the thrust direction which is the direction of the rotating shaft.
[0019]
A rolling bearing 401 serving as an upper main shaft support portion is disposed above the electric motor portion 600, and a rolling bearing (sub bearing) 803 constituting a main portion of a sub bearing portion 800 serving as a lower main shaft support portion is provided below the electric motor portion 600. Is located on the side. A housing 802 is fixed to a lower frame housing 801 fixed to the sealed container 700 via bolts 805. A rolling bearing 803 is inserted into the housing 802 from above, and a housing cover 804 is further attached from above. A pump unit 900 is attached to a lower end of the housing 802 via a bolt 910. The pump unit 900 is driven via a pump joint 310 provided at a lower end of the rotating shaft 300.
[0020]
The Oldham coupling 500 is disposed on the back surface of the base plate 201 of the orbiting scroll 200. One set of two orthogonal key portions formed on the Oldham coupling 500 slides on a key groove which is a receiving portion of the Oldham coupling 500 formed on the frame 400, and the other set is formed on the back side of the orbiting scroll wrap 202. Slide the keyway. As a result, the orbiting scroll 200 orbits without rotating on the fixed scroll 100 in a plane perpendicular to the axial direction in which the scroll wrap 202 stands.
[0021]
When the crank pin 301 is eccentrically rotated by the rotation of the rotating shaft 300 connected to the electric motor unit 600, the compression mechanism unit 2 performs the orbiting motion without rotating with respect to the fixed scroll 100 by the rotation preventing mechanism of the Oldham coupling 500. Then, the gas is sucked into the compression chamber 130 formed by the scroll wraps 102 and 202 via the suction pipe 711 and the suction port 103.
[0022]
Due to the orbiting movement of the orbiting scroll 200, the compression chamber 130 moves to the center, reduces the volume, compresses the gas, and discharges the compressed gas from the discharge port 104 to the discharge chamber. The gas discharged into the discharge chamber circulates around the compression mechanism section 3 and the electric motor section 600, and is then discharged out of the compressor from the discharge pipe 701. The back plate 201 of the orbiting scroll 200 is provided with a back pressure hole 204 for communicating the compression chamber 130 and the back pressure chamber 411 on the back of the orbit, and the pressure of the back pressure chamber 411 is intermediate between the suction pressure and the discharge pressure. (Intermediate pressure). The back pressure chamber 411 formed on the back side of the orbiting scroll 200 is a space formed by being surrounded by the orbiting scroll 200, the frame 400, and the fixed scroll 100.
[0023]
The seal ring 410 provided on the frame 400 prevents the discharge gas from flowing into the back pressure chamber. The orbiting scroll 200 is pressed against the fixed scroll 100 by the combined force of the intermediate pressure and the discharge pressure acting inside the seal ring 410.
[0024]
Here, the inner diameter of the seal ring 410 is smaller than the outer diameter of the rolling bearing 401. In order to be able to adopt such a configuration, in the present embodiment, the rolling bearing 401 is inserted into the frame 400 from the rotation driving means side of the frame 400, and the inserted rolling bearing 401 is fixed by the frame cover 403. Has become. A thrust bearing 402 is provided on the frame cover 403. The frame cover 403 is formed separately from the frame 400. The frame cover 403 is fixed to the frame 400 by bolts 406. By using the bolts, the gap between the frame cover 403 and the frame 400 can be accurately sealed, so that oil leakage from the oil supply path can be suppressed. The frame cover 403 includes a portion that is inserted inside the frame 400 to hold the rolling bearing 401 and a portion that abuts against and is fixed to the end face of the frame 400 on the rotation driving unit side.
[0025]
Further, a balance weight cover 403 is provided to prevent turbulence in the airflow caused by the rotation of the balance weight 407 from acting near the discharge pipe 701. Since the balance weight cover 403 is fixed to the frame 400 with the bolts 406 together with the balance weight 407, the number of components can be reduced and the space can be saved. The balance weight cover 403 is formed in a substantially cylindrical shape having a diameter slightly smaller than the inner diameter of the coil end of the stator 601, and covers the periphery of the balance weight 407 so that the turbulence of the air flow due to the rotating operation of the balance weight 407 does not act on the vicinity of the discharge pipe 701. It has become.
[0026]
Next, the refueling path will be described. When the rotating shaft 300 is rotated, the oil in the oil sump 730 is sent to the oil passage 311 in the rotating shaft by the pump unit 900. Part of the oil sent to the oil passage 311 flows through the lateral hole 312 to the sub-bearing 803 which is a rolling bearing, and then returns to the oil sump 730. The oil that has reached the upper part of the crank pin 301 through the oil passage 311 flows through the swivel bearing 210 to the rolling bearing 401. The oil that has lubricated the rolling bearing 401 passes through the oil drain pipe 408 and returns to the oil sump 730.
[0027]
A refueling pocket 205 is provided on the end face of the boss 203 of the orbiting scroll 200. When the orbiting scroll 200 makes a revolving motion, the refueling pocket 205 reciprocates between the outside and the inside of the seal ring 410, and the revolving bearing 210 A part of the oil between the bearings 401 is transferred to the back pressure chamber 411. After the conveyed oil is supplied to the Oldham coupling 500, it is supplied to the sliding surface of the end surface 105 of the fixed scroll and the base plate 201 of the orbiting scroll.
[0028]
The oil conveyed to the back pressure chamber 411 flows into the compression chamber 130 through the back pressure hole 204 or through a minute gap in the end plate sliding surface. The oil that has flowed into the compression chamber 130 is discharged from the discharge port 104 together with the compressed refrigerant gas, is separated from the refrigerant gas in the closed container 700, and returns to the oil sump 730.
[0029]
Next, the fixed scroll 100 will be described with reference to FIGS. The fixed scroll 100 has a mirror surface 105 on the outer peripheral side of the compression chamber 130 with which the base plate 201 of the orbiting scroll 200 contacts. The end surface 105 is formed on the outer peripheral side including a wrap forming the outermost periphery of the compression chamber 130. The radial width B from the inner circumference to the outer circumference of the end surface 105 of the fixed scroll 100 is larger than twice the turning radius of the orbiting scroll 200.
[0030]
An oil supply groove 106 is provided on the end surface 105 of the fixed scroll 100. One side of the oil supply groove 106 is opened so as to communicate with the back pressure chamber 411 which is an outer peripheral space, and the other side is formed as a closed passage extending in the circumferential direction and not communicating with the compression chamber 13. A plurality of oil supply grooves 106 are provided (two in the illustrated example), and the plurality of oil supply grooves 106 are formed so as to have a plurality of portions in the radial direction. The width of the mirror surface 106 between the oil supply groove 106 and the compression chamber 130 is equal to or less than twice the turning radius of the orbiting scroll 200. Also, the width L of the end plate surface 106 between the inner oil supply groove 106 and the outer oil supply groove 106 and the width of the end plate surface 106 between the outer oil supply groove 106 and the outer periphery of the orbiting scroll 200 are also changed. Is twice or less of the turning radius of. Further, the oil supply groove 106 is formed in an arc shape from the outer peripheral side to the inner peripheral side so as to approach the compression chamber 106, and is formed so as to extend in the same direction as the turning direction of the orbiting scroll 200. The arc of the oil supply groove 106 extending from the outer peripheral side to the inner peripheral side is formed by a plurality of arcs (two arcs in the illustrated example).
[0031]
According to the present embodiment, the fixed scroll 100 has the mirror surface 105 on the outer peripheral side of the compression chamber 130 with which the base plate 201 of the orbiting scroll 200 contacts, and has one side communicating with the outer peripheral space 411 and the other side circular. Since the oil supply groove 106 serving as a closed passage extending in the circumferential direction is provided on the end plate surface, the oil supplied to the outer peripheral space 411 of the orbiting scroll 200 can be reliably supplied to the oil supply groove 106 with a simple structure. The width B of the mirror surface 105 can be made large. As a result, the end plate surface 105 of the fixed scroll 100 can be reliably lubricated with a simple structure, and the sliding surface pressure can be reduced to prevent galling and seizure of the end plate surface 105. Excellent reliability can be obtained.
[0032]
Further, since the radial width B from the inner circumference to the outer circumference of the end surface 105 of the fixed scroll 100 is larger than twice the turning radius of the orbiting scroll 200, the end surface of the turning surface of the orbiting scroll 200 is always large when turning. 105 comes into sliding contact with the orbiting scroll, and the reliability can be further improved.
[0033]
Further, since a plurality of oil supply grooves 106 are provided, and the plurality of oil supply grooves 106 are formed so as to have a plurality of portions in the radial direction, the radial direction from the inner circumference to the outer circumference of the end surface 105 of the fixed scroll 100 is Even if the width B is increased, the end surface 105 can be reliably lubricated, and the reliability can be further improved. Here, since the width of the mirror plate surface 105 between the oil supply groove 106 and the compression chamber 130 is set to be equal to or less than twice the turning radius of the orbiting scroll 200, it is possible to reliably lubricate the mirror plate surface 105.
[0034]
Further, the oil supply groove 106 is formed so as to extend in an arc shape from the outer peripheral side to the inner peripheral side, and is formed in the same direction as the turning direction of the orbiting scroll 200. Thus, it is possible to more effectively guide the fuel supply and increase the amount of refueling.
[0035]
【The invention's effect】
According to the present invention, it is possible to reliably lubricate the end plate surface on the outer periphery of the fixed scroll with a simple structure, to reduce the sliding surface pressure and to prevent galling and seizure of the end plate surface, An inexpensive and highly reliable scroll compressor can be obtained.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view of a scroll compressor according to an embodiment of the present invention.
FIG. 2 shows a fixed scroll used in the scroll compressor of FIG.
[Explanation of symbols]
100: fixed scroll, 101: base plate, 102: lap, 103: suction port, 104: discharge port, 105: mirror plate surface, 106: oil supply groove, 200: orbiting scroll, 201: base plate, 202: wrap, 203 ... Boss, 204: Back pressure hole, 205: Refueling pocket, 210: Revolving bearing, 300: Rotating shaft, 301: Crank pin, 310: Pump joint, 311: Oil passage, 312: Side hole, 400: Frame, 401: Rolling bearing, 402: Thrust bearing, 403: Frame cover, 404: Balance weight cover, 407: Balance weight, 408: Oil drain pipe, 410: Seal ring, 411: Back pressure chamber, 500: Oldham coupling, 600: Motor unit, 601 Stator, 602 rotor, 700 sealed container, 701 discharge pipe, 702 Herme terminal, 710 Cap, 711: suction pipe, 720: lower cap, 721: leg, 70: oil reservoir, 800: auxiliary bearing, 801: lower frame housing, 802: housing, 803: rolling bearing (auxiliary bearing), 804: housing Cover, 805: bolt, 900: pump part.

Claims (7)

A fixed scroll with a spiral wrap standing on the base plate,
An orbiting scroll that erects a spiral wrap on the base plate and engages with the fixed scroll so as to form a compression chamber;
An outer peripheral space having a pressure lower than the discharge pressure and supplied with oil outside the orbiting scroll,
The fixed scroll has a mirror plate surface on the outer peripheral side of the compression chamber with which the base plate of the orbiting scroll contacts, and has a closed passage communicating one side to the outer peripheral space and the other side extending in a circumferential direction. A scroll compressor, wherein a groove is provided in the end plate surface. 2. The scroll compressor according to claim 1, wherein a radial width from an inner circumference to an outer circumference of the end surface of the fixed scroll is larger than twice a turning radius of the orbiting scroll. 3. The scroll compressor according to claim 1, wherein a plurality of the oil supply grooves are provided, and the plurality of oil supply grooves are formed to have a plurality of radially extending portions. 4. The scroll compressor according to claim 1, wherein a width of the end plate surface between the oil supply groove and the compression chamber is set to be equal to or less than twice a turning radius of the orbiting scroll. 5. Scroll compressor. 5. The scroll compressor according to claim 1, wherein the oil supply groove is formed to extend in an arc shape from an outer peripheral side to an inner peripheral side. 6. The scroll compressor according to any one of claims 1 to 5, wherein a direction extending from one side of the oil supply groove to the other side is the same as a turning direction of the orbiting scroll. A fixed scroll with a spiral wrap standing on the base plate,
An orbiting scroll that erects a spiral wrap on the base plate and engages with the fixed scroll so as to form a compression chamber;
A rotating shaft that drives the orbiting scroll and has an oil passage;
A closed container having an oil sump at the bottom,
A back pressure chamber having an intermediate pressure between the discharge pressure and the suction pressure on the back side of the orbiting scroll and the oil of the oil reservoir being supplied through an oil passage of the rotary shaft;
The fixed scroll has an end surface including a wrap forming the outermost periphery of the compression chamber and a mirror surface on which the base plate of the orbiting scroll comes into contact, and one side communicates with a space on the outer peripheral side of the orbiting scroll. A scroll compressor characterized in that an oil supply groove having a closed passage extending in the circumferential direction on the other side is provided on the end plate surface of the fixed scroll.

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