JP2009174500A - Hermetically sealed scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetically sealed scroll compressor capable of improving sliding and sealing properties. <P>SOLUTION: The hermetically sealed scroll compressor 1 includes a low pressure chamber 9 in which a fixed scroll 2, a turning scroll 3, a frame 5, a crankshaft 6, and a motor 7 are stored in a hermetic container 8, whereby suction gas is introduced into an outer region of the frame 5 in the hermetic container 8, and a back pressure chamber 11 for maintaining the pressure in the back side region of the turning scroll 3 in the frame 5 to between a discharge pressure and a suction pressure. The compressor 1 further includes an oil feed passage 6b formed in the crankshaft 6 for supplying lubricating oil stored in the low pressure chamber 9 to the inside of a boss part 3a of the turning scroll 3, an oil groove 3d corned in a C shape over the entire periphery of a sliding face of an end plate 3a of the turning scroll 3 and intermittently communicating with an operating chamber accompanying turning of the turning scroll 3, and an oil feed hole 3e formed in the turning scroll 3 to directly communicate the inside of a boss part 3c and the oil groove 3d of the turning scroll 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hermetic scroll compressor suitable for use in, for example, a refrigeration cycle using carbon dioxide as a refrigerant.

  Conventionally, as an example of a hermetic scroll compressor, a fixed scroll having an end plate and a spiral wrap erected on the end plate, and an end plate and the fixed scroll erected on the end plate are engaged with each other. Orbiting scroll having a spiral lap that forms a chamber (suction chamber, compression chamber), an Oldham ring that supports the orbiting scroll without rotation (revolution is possible), and an orbiting scroll fastened to a fixed scroll And a frame that houses the Oldham ring, a crankshaft that is disposed so as to penetrate the frame and whose one end (eccentric portion) is engaged with the rear side boss of the orbiting scroll, and is disposed outside the frame. Electric motor that rotates the main shaft of the crankshaft to rotate the orbiting scroll, and these fixed scroll, orbiting scroll, Oldham Ring, frame, configured with a closed container for containing the crank shaft, and an electric motor or the like is disclosed (for example, see Patent Document 1). And with the turning of the orbiting scroll, the working chamber moves to the center side in the radial direction, the volume is reduced, and compressed gas is generated.

  In the hermetic scroll compressor described in Patent Document 1, a frame in which an electric motor and the like are arranged and an outer region of the fixed scroll (in other words, in a hermetic container) are low-pressure chambers into which suction gas is introduced. As a result, the pressure resistance of the sealed container is reduced to reduce the weight. In addition, a back pressure chamber is formed between the discharge pressure and the suction pressure on the back side of the orbiting scroll in the frame, and the orbiting scroll is urged toward the fixed scroll by the pressure of the back pressure chamber. Yes. Thus, the thrust force due to the compression reaction force is reduced to reduce the mechanical friction loss, and the axial clearance at the tip of the lap is reduced to improve the sealing performance of the working chamber. Therefore, the compression efficiency is improved.

  Lubricating oil is stored in the lower part of the low-pressure chamber, and this lubricating oil is supplied to the bearing and the end plate sliding surface of the scroll. Details of the lubricating oil system will be described below.

  An oil supply pump (such as a trochoid pump) is provided at the other end of the crankshaft. In addition, the crankshaft is formed with a lubricating oil passage penetrating in the axial direction, a spiral groove formed in a spiral shape on the peripheral surface, and a lateral hole communicating the lubricating oil passage and the spiral groove. The lubricating oil stored in the lower portion of the low pressure chamber is supplied to the lubricating oil passage of the crankshaft by the oil supply pump, and then supplied to the bearing through the lateral hole and the spiral groove.

  The remaining lubricating oil supplied to the lubricating oil passage of the crankshaft and not used for bearing lubrication reaches the inner bottom surface (in other words, the end plate rear surface) of the orbiting scroll, and the first oil supply mechanism In addition to being supplied to the end plate sliding surface of the orbiting scroll, it is intermittently supplied to the working chamber. The first oil supply mechanism is formed on the inner bottom surface of the boss portion of the orbiting scroll and on the end plate sliding surface of the fixed scroll and the first oil supply passage formed to open to the end plate sliding surface. The first recess and the second recess formed on the sliding surface of the end plate of the orbiting scroll and spaced radially inward from the sliding surface side opening of the first oil supply passage. As the orbiting scroll turns, the first oil supply passage of the orbiting scroll intermittently communicates with the second depression via the first depression of the fixed scroll, and the lubricating oil is supplied to the second depression. It is like that. Further, as the orbiting scroll is turned, the second depression of the orbiting scroll is intermittently communicated with the working chamber (however, at a timing different from the timing of communicating with the first oil supply passage), and lubricating oil is supplied to the working chamber. Is to be supplied. Thereby, the sealing performance of the working chamber is enhanced.

  The lubricating oil supplied to the working chamber is discharged together with the compressed gas, separated in the discharge chamber, and stored in the lower portion of the discharge chamber. Thereafter, a part of the lubricating oil stored in the lower portion of the discharge chamber is supplied to the back pressure chamber by the second oil supply mechanism. The second oil supply mechanism includes a second oil supply passage formed in the fixed scroll so as to open to the back surface (in other words, the discharge chamber) and the end plate sliding surface of the fixed scroll, and the end of the orbiting scroll. A third recess formed in the plate sliding surface and a fourth recess formed in the end plate sliding surface of the fixed scroll and spaced radially outward from the sliding surface side opening of the second oil supply passage. It is configured. As the orbiting scroll turns, the second oil supply passage of the fixed scroll intermittently communicates with the fourth depression via the third depression of the orbiting scroll, and the lubricating oil is supplied to the fourth depression. It is like that. As the orbiting scroll turns, the fourth depression of the fixed scroll intermittently communicates with the back pressure chamber (but at a timing different from the timing when communicating with the second oil supply passage) and enters the back pressure chamber. Lubricating oil is supplied. Thereby, the Oldham ring in the back pressure chamber is lubricated.

  A part of the lubricating oil stored in the lower part of the discharge chamber is returned to the low pressure chamber by the oil return mechanism. The oil return mechanism is formed on the rear surface of the end plate of the fixed scroll (in other words, the discharge chamber) and the third oil supply passage formed to open to the end plate sliding surface and the end plate sliding surface of the orbiting scroll. A fourth recess formed so that one side opens radially outward from the sliding surface side opening of the third oil supply passage of the fixed scroll and the other side opens to the outer peripheral portion of the fixed scroll. It consists of an oil supply passage. As the orbiting scroll turns, the third oil supply passage of the fixed scroll intermittently communicates with the fourth supply passage via the fifth depression of the orbiting scroll so that the lubricating oil is returned to the low pressure chamber. It has become.

JP-A-2005-180320

However, the above prior art has room for improvement as follows.
That is, the first oil supply mechanism includes a first oil supply passage formed to open to the inner bottom surface of the boss portion of the orbiting scroll and the end plate sliding surface, and the end plate sliding surface of the fixed scroll. The first recess formed and the second recess formed on the sliding surface of the end plate of the orbiting scroll and spaced radially inward from the sliding surface side opening of the first oil supply passage. As the orbiting scroll turns, it communicates in multiple stages in the order of the first oil supply passage of the orbiting scroll → the first depression of the fixed scroll → the second depression of the orbiting scroll → the working chamber. . In such a structure, it is difficult to form the first depression of the fixed scroll and the second depression of the orbiting scroll over almost the entire circumference of the end plate sliding surface. The distribution of the lubricating oil supply will be biased. Therefore, there is room for improvement in terms of lubrication and sealing performance.

  An object of the present invention is to provide a scroll compressor capable of improving lubrication and sealing performance.

  In order to achieve the above object, the present invention provides a fixed scroll having an end plate and a spiral wrap erected on the end plate, and meshes with the end plate and the wrap of the fixed scroll erected on the end plate. An orbiting scroll having a spiral wrap that forms a working chamber, a frame that houses the orbiting scroll, a crankshaft in which an eccentric portion on one axial side is engaged with a boss portion of the orbiting scroll, and the frame An electric motor that is arranged outside and rotates the crankshaft to turn the orbiting scroll, and a sealed container that houses the fixed scroll, the orbiting scroll, the frame, the crankshaft, and the electric motor, An outer region of the frame formed in the sealed container and where the electric motor is disposed is a low-pressure chamber into which suction gas is introduced, and the frame In the hermetic scroll compressor in which the back side region of the orbiting scroll formed inside is a back pressure chamber in which the pressure is between discharge pressure and suction pressure, the crankshaft is formed and stored in the low pressure chamber. An oil supply passage for supplying lubricating oil to the inside of the boss portion of the orbiting scroll, and a C-shape or an annular shape extending over the entire circumference of the end plate sliding surface of the orbiting scroll Formed in the orbiting scroll so as to communicate directly with the oil groove intermittently communicating with the working chamber as the orbiting scroll turns, and the inside of the boss portion of the orbiting scroll and the oil groove. It has an oil supply hole.

  According to the present invention, the lubrication / seal performance can be improved.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing the overall structure of an embodiment of a hermetic scroll compressor of the present invention, and FIG. 2 is a partially enlarged view showing the structure of a main part of one embodiment of the hermetic scroll compressor of the present invention. It is sectional drawing. FIG. 3 is a plan view showing the structure of the fixed scroll (viewed from the lower side in FIG. 1). FIG. 4 is a plan view of the orbiting scroll (viewed from the upper side in FIG. 1), and a two-dot chain line in the figure indicates the position of the orbiting bearing. FIG. 5 is a diagram showing the meshing state of the fixed scroll and the orbiting scroll (viewed from the upper side in FIG. 1), and the two-dot chain line in the diagram indicates the outline of the end plate of the orbiting scroll.

  1 to 5, a vertical type (a type in which the axial direction is arranged in the vertical direction) hermetic scroll compressor 1 is erected on an end plate (end plate) 2 a and the end plate 2 a. A fixed scroll 2 having a spiral wrap 2b, an end plate (end plate) 3a, and an orbiting scroll having a spiral wrap 3b that stands on the end plate 3a and meshes with the wrap 2b of the fixed scroll 2 to form a working chamber. 3, an Oldham ring 4 that supports the orbiting scroll 3 so that it can be swiveled (revolved) without rotating, an upper frame 5 that is fastened to the fixed scroll 1 and houses the orbiting scroll 3 and the Oldham ring 4, An upper end portion (eccentric portion 6 a) disposed so as to penetrate the frame 5 is engaged with the rear side boss portion 3 c of the orbiting scroll 3. An electric motor 7 disposed on the lower side of the crankshaft 6 and the upper frame 5 (the lower side in FIGS. 1 and 2) to rotate the crankshaft 6 to turn the orbiting scroll 3, the fixed scroll 2, and the orbiting scroll 3 The Oldham ring 4, the upper frame 5, the crankshaft 6, the electric motor 7, and the like are provided. As the orbiting scroll 3 turns, the working chamber moves toward the center in the radial direction, the volume is reduced, and compressed gas is generated.

  The lower region of the upper frame 5 in the sealed container 8 forms a low pressure chamber 9 into which the suction gas is introduced, and the back side region (upper region) of the fixed scroll 1 in the sealed container 8 discharges compressed gas. A discharge chamber 10 is formed. A back side region (a lower side region) of the orbiting scroll 3 in the upper frame 5 forms a back pressure chamber 11 that serves as a pressure between the discharge pressure and the suction pressure. In order to maintain the pressure in the back pressure chamber 11, the seal mechanism 12 that suppresses leakage from the gap between the end surface of the boss portion 3 c of the orbiting scroll 3 and the upper frame 5, the back pressure chamber 11 side, and the low pressure chamber 9 side. And a back pressure adjusting valve 13 that opens and closes according to the pressure difference.

  A gas-liquid separation cover 14 is provided in the low-pressure chamber 9, and the gas-liquid separation cover 14 collides the suction gas from the suction pipe 15 with the inner wall as shown by an arrow in FIG. The contained liquid is separated. The gas-liquid separation cover 14 has openings on the upper side and the lower side. 2, the suction gas is formed between the upper opening of the gas-liquid separation cover 14 and the suction passage 16 (specifically, between the outer peripheral cutout of the upper frame 5 and the sealed container 8). And is introduced into the working chamber via the working chamber inlet 2 d of the fixed scroll 2. The compressed gas generated in the working chamber is discharged to the discharge chamber 10 via the discharge port 2 e of the fixed scroll 2 and further supplied to the outside via the discharge pipe 17.

  On the back side of the fixed scroll 2, a discharge valve (in this embodiment, a reed valve, which may be a flapper valve, a poppet valve, etc.) 18 that opens and closes the discharge port 2e, and a valve cover 19 that covers the discharge valve 18 are provided. Is attached. As indicated by an arrow in FIG. 2, the valve cover 19 collides the compressed gas from the discharge port 2 e of the fixed scroll 2 with the inner wall, and primarily causes oil contained in the compressed gas (details will be described later, lubricating oil). Further, the compressed gas is further discharged to the outer side in the radial direction (left side in FIGS. 1 and 2) to collide with the sealed container 8, and the oil contained in the compressed gas is secondarily separated. The oil thus separated is accumulated in a recess 2 f formed on the back surface of the fixed scroll 2.

  The crankshaft 6 is rotatably supported via a main bearing 20 and a sub-bearing 21, and an eccentric portion 6 a at an upper side end thereof is engaged with a boss portion 3 c of the orbiting scroll 3 via an orbiting bearing 22. Yes. Further, a thrust ring 23 is provided for supporting a thrust force due to the weight of the crankshaft 6 and the electric motor 7. The main bearing 20 and the thrust ring 23 are disposed on the upper frame 5, and the auxiliary bearing 22 is disposed on the lower frame 24. In addition, balance weights 25 and 26 are respectively attached to the crankshaft 6 and the rotor of the electric motor 7 in order to balance the rotation with the eccentric portion 6 a of the crankshaft 6.

  An oil sump 27 is formed in the lower part of the low-pressure chamber 9, and a lubricating oil system is provided for supplying the lubricating oil of the oil sump 27 to the bearings 20 to 23, the end plate sliding surfaces of the scrolls 2 and 3, and the like. Yes. Details of this lubricating oil system will be described below.

  An oil supply pump 28 is provided at the lower end of the crankshaft 6. The crankshaft 6 has an oil passage 6b that penetrates in the axial direction, a horizontal hole 6c that opens to the oil passage 6b and an outer peripheral surface (specifically, a position facing the inner peripheral surface of the auxiliary bearing 21), and An oil supply passage 6c and a lateral hole 6d that opens to the outer peripheral surface (specifically, a position facing the inner peripheral surface of the main bearing 20) are formed. The lubricating oil in the oil reservoir 27 is supplied to the oil supply passage 6b of the crankshaft 6 by the oil supply pump 28, and then supplied to the auxiliary bearing 21 and the main bearing 20 through the lateral holes 6c and 6d. The lubricating oil that has lubricated the auxiliary bearing 21 is returned to the oil sump 27 by free fall. Further, the remaining lubricating oil supplied to the oil supply passage 6b of the crankshaft 6 and not used for lubricating the auxiliary bearing 21 and the main bearing 20 reaches the inner bottom surface of the boss portion 3c of the orbiting scroll 3, and a part thereof. Supplied to the slewing bearing 22. The lubricating oil that has lubricated the slewing bearing 22 further lubricates the thrust ring 23, and then merges with the lubricating oil that has lubricated the main bearing 20, and is connected to the oil return passage 5a formed in the upper frame 5 and this. The oil is returned to the oil sump 27 via the oil return pipe 29.

  Further, a part of the lubricating oil that has reached the inner bottom surface of the boss 3c of the orbiting scroll 3 is supplied to the sliding surface of the end plate 3a of the orbiting scroll 3 by the first oil supply mechanism and into the working chamber. It is supplied intermittently. The first oil supply mechanism is formed in a C-shape (in other words, in an arc shape in a range of 270 degrees or more and less than 360 degrees) so as to extend almost entirely around the sliding surface of the end plate 3 a of the orbiting scroll 3. For example, three oil supply holes 3e formed radially on the orbiting scroll 3 so as to open to the oil groove 3d, the inner bottom surface of the boss 3a of the orbiting scroll 3 and the oil groove 3d (note that the oil supply holes 3e The stopper plug 3h is attached to the outer peripheral side opening). Further, the oil groove 3d of the orbiting scroll 3 is formed with a recess 3f for intermittently communicating with the working chamber inlet 2d of the fixed scroll 2 (in this embodiment, there is only one recess 3f. Although not formed, a plurality of locations may be formed). 6 (a) to 6 (d), as the orbiting scroll 3 turns, the oil groove 3d of the orbiting scroll 3 becomes the working chamber inlet 2d (in other words, the working chamber) of the fixed scroll 2. ) To communicate intermittently. An arcuate oil groove 2g that directly communicates with the working chamber inlet 2d is formed on the sliding surface of the end plate 2a of the fixed scroll 2 (specifically, the same surface as the tip surface of the wrap 2b). A part of the lubricating oil supplied to the working chamber inlet 2d is led out to the oil groove 2g.

  The lubricating oil supplied to the working chamber is discharged into the discharge chamber 10 together with the compressed gas, separated from the compressed gas by the above-described valve cover 19 and the like, and accumulated in the recess 2f of the fixed scroll 2. The lubricating oil stored in the recess 2f of the fixed scroll 2 is supplied to the back pressure chamber 11 by the second oil supply mechanism. The second oil supply mechanism is formed in the oil return hole 2h formed in the fixed scroll 2 so as to open to the recess 2f and the sliding surface of the fixed scroll 2, and the sliding surface of the end plate 3a of the orbiting scroll 3, respectively. The formed oil pocket 3g and an annular oil groove 2i that is located radially outward from the sliding surface side opening of the oil return hole 2h of the fixed scroll 2 and communicates with the back pressure chamber. Then, as shown in FIGS. 7A to 7F, as the orbiting scroll 3 turns, the oil return hole 2h of the fixed scroll 2 communicates intermittently with the oil pocket 3g of the orbiting scroll 3, Lubricating oil is supplied from the discharge chamber 10 to the oil pocket 3g. As the orbiting scroll 3 turns, the oil pocket 3g of the orbiting scroll 3 communicates intermittently with the oil groove 2i of the fixed scroll 2 (however, at a timing different from the timing of communicating with the oil return hole 2h), Lubricating oil is supplied to the back pressure chamber 11. The lubricating oil supplied to the back pressure chamber 11 lubricates the Oldham ring 4, and then flows out to the oil return channel 5 a of the upper frame 5 via the back pressure adjusting valve 13, and enters the oil reservoir 27. It is supposed to be returned.

  As described above, in the present embodiment, the orbiting scroll 3 has the oil supply holes 3e formed radially so as to open to the inner bottom surface of the boss portion 3a and the oil groove 3d. In other words, the oil groove 3d of the orbiting scroll 3 communicates directly with the oil supply hole 3e. As the orbiting scroll 3 turns, the oil groove 3d of the orbiting scroll 3 intermittently communicates with the working chamber in one step. Since the first oil supply mechanism is configured in this way, the oil groove 3d of the orbiting scroll 3 can be formed in a C shape so as to extend over substantially the entire circumference. Therefore, the lubrication / seal performance can be improved. In the present embodiment, the oil groove 3d of the orbiting scroll 3 is formed in a C-shape so as to extend over the entire circumference in consideration of the engagement with the oil pocket 3g and the like in the second oil supply mechanism. However, the present invention is not limited to this. For example, it may be formed in an annular shape over the entire circumference. In this case, the same effect as described above can be obtained.

  Next, the detailed structure of the seal mechanism 12 in this embodiment will be described. FIG. 8 is a cross-sectional view showing the detailed structure of the seal mechanism 12. Fig.9 (a) is a top view of a wire spring, FIG.9 (b) is the side view seen from the arrow A direction in Fig.9 (a).

  In FIG. 8, FIG. 9A, FIG. 9B, and FIG. 2 described above, the seal mechanism 12 is a cylindrical seal member 31 disposed in an annular groove 5b formed in the upper frame 5. A rubber O-ring 32 disposed between the inner peripheral surface of the seal member 31 and the side surface of the groove 5b of the upper frame 5, and the end surface of the seal member 31 through the O-ring 32 on the orbiting scroll 3. It is comprised with the substantially annular wire spring 33 (biasing member) pressed against the end surface of the boss | hub part 3c. The wire spring 33 is formed so as to wave in the thickness direction (left and right direction in FIG. 9B) (amplitude δ), and the seal member 31 is levitated by an elastic force (levitation amount Δh). . Thereby, for example, even if the differential pressure between the back pressure chamber 11 side and the oil return passage 5 a side does not occur, the end surface of the seal member 31 is pressed against the end surface of the boss portion 3 c of the orbiting scroll 3 by the wire spring 33. Therefore, the sealing performance can be ensured regardless of the operating state. Further, by providing the O-ring 32, it is possible to cope with a radial displacement between the upper frame 5 and the seal member 31 due to the influence of a difference in thermal expansion or the like, and it is possible to ensure sealing performance.

  Next, the detailed structure of the back pressure regulating valve 13 in this embodiment will be described. FIG. 10 is a cross-sectional view showing the detailed structure of the back pressure adjusting valve 13.

  In FIG. 10, the upper frame 5 is formed with a communication passage 5c that allows the back pressure chamber 11 and the oil return passage 5a to communicate with each other. The back pressure regulating valve 13 includes a valve seat 34 press-fitted and fixed in the communication passage 5c, a valve plate 35 for opening and closing the opening of the valve seat 34, and the valve plate 35 on the back pressure chamber 11 side (upper side in the figure). And a coil spring 36 that biases the spring. For example, when the pressure in the back pressure chamber 11 is greater than the sum of the pressure on the oil return passage 5a side (in other words, the pressure in the low pressure chamber 9) and the biasing force (pressure converted value) of the coil spring 36, the valve plate 35 Moves to the oil return passage 5a side (lower side in the figure) and opens the valve seat 34, so that the pressure in the back pressure chamber 11 decreases and the lubricating oil in the back pressure chamber 11 flows into the oil return passage 5a. And returned to the oil sump 27. On the other hand, for example, when the pressure in the back pressure chamber 11 is smaller than the sum of the pressure on the oil return passage 5a side and the urging force (converted pressure value) of the coil spring 36, the valve plate 35 moves to the back pressure chamber 11 side. The valve seat 34 is closed. In this way, the pressure in the back pressure chamber 11 can be adjusted to a predetermined value set by the coil spring 36. Here, for example, a case is assumed in which a communication passage that connects the back pressure chamber 11 and the working chamber on the lower pressure side is formed, and a back pressure adjusting valve is provided in the communication passage. In such a case, the lubricating oil in the back pressure chamber 11 flows out to the working chamber via the back pressure regulating valve. Therefore, depending on the operating conditions, the lubricating oil accumulates on the discharge chamber 10 side and lubrication on the low pressure chamber 9 side. Oil shortage may occur. In the present embodiment, the back pressure adjusting valve 13 is provided in the communication passage 5c that connects the back pressure chamber 11 side and the low pressure chamber 9 side, and the lubricating oil in the back pressure chamber 11 is low pressure through the back pressure adjusting valve 13. Since it flows into the chamber 9, it can be avoided that the lubricating oil on the low pressure chamber 9 side is insufficient. As a result, the supply of lubricating oil to the bearings 20 to 23 and the end plate sliding surfaces of the scrolls 2 and 3 described above can be stabilized, and the lubrication and sealing performance can be improved.

  In the above description, the vertical type hermetic scroll compressor 1 has been described as an example. However, the present invention is not limited thereto, and a horizontal type (type in which the axial direction is a horizontal direction) hermetic scroll compressor may be used. (In the case of the horizontal installation type, a suction pipe is provided in the oil supply pump 28 or the oil return pipe 29 is removed). Although not particularly described in the above embodiment, the hermetic scroll compressor of the present invention can be used for a refrigeration air conditioner having a refrigeration cycle using carbon dioxide as a refrigerant, for example. The refrigeration cycle of such a refrigeration air conditioner will be described with reference to FIG.

  The refrigeration cycle shown in FIG. 11 includes a horizontally placed hermetic scroll compressor 1A, a gas cooler (heat radiator) 37, an expansion valve 38, and an evaporator 39. Since the carbon dioxide refrigerant has a critical temperature as low as about 31 ° C. compared to the fluorocarbon refrigerant, the supercritical cycle in which the operating pressure on the high-pressure side exceeds the critical pressure (about 7 MPa). More specifically, the carbon dioxide gas compressed by the hermetic scroll compressor 1A becomes a supercritical state of high temperature and high pressure, and then the heat is dissipated by the gas cooler 37 and the temperature is lowered. The temperature decreases to become a low-temperature / low-pressure gas-liquid two-phase refrigerant, and then the heat is absorbed by the evaporator 39 to increase the temperature and gasify. In a general refrigeration cycle using carbon dioxide as a refrigerant, the pressure difference between the high pressure side and the low pressure side is large, which causes a problem that leakage loss from the working chamber of the compressor increases. However, if the hermetic scroll compressor of the present invention is used, the sealing performance of the working chamber can be improved as described above, and leakage loss can be reduced. As a result, the performance and reliability of the refrigeration air conditioner can be improved.

It is sectional drawing showing the whole structure of one Embodiment of the hermetic scroll compressor of this invention. It is a partial expanded sectional view showing the principal part structure of one Embodiment of the hermetic scroll compressor of this invention. It is a top view showing the structure of the fixed scroll in one Embodiment of the hermetic scroll compressor of this invention. It is a top view showing the structure of the turning scroll in one Embodiment of the hermetic scroll compressor of this invention. It is a figure showing the meshing state of the fixed scroll and the turning scroll in one Embodiment of the hermetic scroll compressor of this invention. It is a figure for demonstrating operation | movement of the 1st oil supply mechanism in one Embodiment of the hermetic scroll compressor of this invention. It is a figure for demonstrating operation | movement of the 2nd oil supply mechanism in one Embodiment of the hermetic scroll compressor of this invention. It is sectional drawing showing the detailed structure of the seal mechanism in one Embodiment of the hermetic scroll compressor of this invention. It is the top view and side view showing the structure of the wire spring of the sealing mechanism in one Embodiment of the hermetic scroll compressor of this invention. It is sectional drawing showing the detailed structure of the back pressure regulating valve in one Embodiment of the hermetic scroll compressor of this invention. It is a figure showing the structure of the refrigerating cycle to which the modification of the hermetic scroll compressor of this invention was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealed scroll compressor 1A Sealed scroll compressor 2 Fixed scroll 2a End plate 2b Wrap 3 Orbiting scroll 3a End plate 3b Wrap 3c Boss part 3d Oil groove 3e Oil supply hole 4 Oldham ring 5 Upper frame 5c Communication path 6 Crankshaft 6a Eccentric portion 6b Oil supply passage 7 Electric motor 8 Sealed container 9 Low pressure chamber 11 Back pressure chamber 12 Seal mechanism 13 Back pressure adjustment valve 31 Seal member 32 O-ring 33 Wire spring (biasing member)

Claims (3)

A fixed scroll having an end plate and a spiral wrap standing on the end plate, and a spiral wrap standing on the end plate and meshing with the fixed scroll wrap to form a working chamber. An orbiting scroll, a frame that houses the orbiting scroll, a crankshaft having an eccentric portion on one side in the axial direction engaged with a boss portion of the orbiting scroll, and an outer side of the frame, and rotationally driving the crankshaft An electric motor for rotating the orbiting scroll; and a fixed container, the orbiting scroll, the frame, the crankshaft, and a hermetic container for housing the electric motor, wherein the electric motor is disposed in the hermetic container. The outer region of the frame is a low-pressure chamber into which suction gas is introduced, and the orbiting scroll formed in the frame In hermetically sealed scroll compressor in which a back pressure chamber to the side area and pressure between the discharge pressure and the suction pressure,
An oil supply passage formed in the crankshaft and configured to supply the lubricating oil stored in the low pressure chamber to the inside of the boss portion of the orbiting scroll;
It is formed in an annular shape so as to extend over the entire circumference of the end plate sliding surface of the orbiting scroll, and intermittently communicates with the working chamber as the orbiting scroll rotates. An oil groove to
A hermetic scroll compressor having an oil supply hole formed in the orbiting scroll so as to directly communicate the inside of the boss portion of the orbiting scroll and the oil groove.   2. The hermetic scroll compressor according to claim 1, further comprising a seal mechanism that suppresses leakage from a gap between an end surface of the boss portion of the orbiting scroll and the frame, wherein the seal mechanism includes a cylindrical seal member and the seal A rubber O-ring disposed between an inner peripheral surface of the member and the frame, and an urging member that presses an end surface of the seal member against an end surface of the boss portion of the orbiting scroll. Hermetic scroll compressor.   3. The hermetic scroll compressor according to claim 1, wherein the hermetic scroll compressor is provided in a communication path that connects the back pressure chamber side and the low pressure chamber side, and according to a pressure difference between the back pressure chamber side and the low pressure chamber side. A hermetic scroll compressor having a back pressure regulating valve that opens and closes.

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