JP2014208985A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor capable of achieving a reduction in the number of components, a size reduction, and a weight reduction.SOLUTION: In a scroll compressor 10, relief paths 52a and 52b are provided in a fixed-side substrate portion 46 of a fixed scroll 18, a gas compression chamber 116 and a gas discharge chamber 30 are formed communicably with each other, and a relief valve 64 that can close opening portions of the relief paths 52a and 52b is provided. Furthermore, if the gas compression chamber 116 formed between a movable-side spiral wall 88 and a fixed-side spiral wall 48 of the fixed scroll 18 is subjected to liquid compression in a state of dividing the gas compression chamber 116 into a first intermediate compression chamber R1 and a second intermediate compression chamber R2 under a turning action of a movable scroll 20, a liquid is discharged to the gas discharge chamber 30 through the relief paths 52a and 52b communicating with the first and second intermediate compression chambers R1 and R2.

Description

  The present invention relates to a scroll compressor that compresses a refrigerant in a housing by turning a movable scroll with respect to a fixed scroll.

  Conventionally, a fixed scroll having a fixed plate and a spiral fixed wall upright on the fixed plate, and a movable scroll arranged so that the movable plate and the spiral movable wall upright on the movable plate are engaged with the fixed wall. And a compression chamber formed between the fixed wall of the fixed scroll and the movable wall of the movable scroll and the fixed plate and the movable plate by rotating the movable scroll through the eccentric crank pin. A scroll compressor that compresses the refrigerant is known.

  Further, in such a scroll compressor, tip seals are attached to the end portions of the fixed wall and the movable wall, and the tip seal contacts the movable plate and the fixed plate, respectively. The compression chamber formed between the two chambers is kept airtight, and a gas such as a refrigerant is compressed in the compression chamber.

  On the other hand, in the scroll compressor as described above, liquid refrigerant that has not been vaporized for some reason may be introduced into the compression chamber. When operated in this state, the liquid is an incompressible fluid. For this reason, the pressure in the compression chamber suddenly rises without being compressed, and accordingly, an excessive load is applied to the movable scroll and the fixed scroll, which may cause damage.

  Therefore, in order to alleviate such a rapid pressure increase during liquid compression, for example, in the scroll compressor disclosed in Patent Document 1, a back pressure chamber is provided on the back side of the movable scroll, and the back pressure chamber The movable scroll is configured to be movable by pressing the movable scroll toward the fixed scroll side by supplying lubricating oil. During normal operation in which no liquid compression occurs, the movable scroll is pressed against the fixed scroll side by the lubricating oil filled in the back pressure chamber and is operated in a state where both are brought into close contact with each other. The refrigerant is compressed in the compression chamber. On the other hand, when liquid compression occurs, the movable scroll moves away from the fixed scroll due to the pressure generated in the compression chamber, and the liquid is compressed through the movable wall and the fixed wall portion where the tip seal is not mounted. It is discharged from the chamber to the low pressure port or high pressure port.

Japanese Patent No. 3189644

  However, in the scroll compressor according to Patent Document 1 described above, a back pressure mechanism including a back pressure chamber, a biasing means, and the like for closely contacting the movable scroll and the fixed scroll during normal operation in which liquid compression does not occur. Therefore, there is a problem that the apparatus is increased in size and the number of parts is increased and the weight is increased.

  The present invention has been made in consideration of the above-described problems, and an object of the present invention is to provide a scroll compressor capable of reducing the number of parts and reducing the size and weight.

In order to achieve the above object, the present invention has a fixed scroll provided in a housing and a movable scroll meshed with the fixed scroll, and the fixed scroll and the movable scroll have a height of a substrate portion. A stepped portion formed higher on the center side of the spiral wall and lower on the outer end side opposite to the center portion; and a height of the spiral wall lower on the side of the center portion and opposite to the center portion A scroll type compressor that has a stepped portion formed high on the outer end side, and that makes the stepped portion and the stepped portion engage with each other to perform a turning operation.
A seal member that is attached to an end of the spiral wall facing the substrate portion and seals between the spiral wall and the substrate portion;
A first intermediate compression chamber formed by abutting an inner surface of the spiral wall in the fixed scroll and an outer surface of the spiral wall in the movable scroll;
A second intermediate compression chamber formed by abutting an inner surface of the spiral wall in the movable scroll and an outer surface of the spiral wall in the fixed scroll;
A communication path that connects the discharge chamber into which the compressed refrigerant is discharged, the first intermediate compression chamber, and the second intermediate compression chamber;
With
Providing a non-mounting region in which the seal member is not mounted in a predetermined range from the outer end of the scroll wall of the fixed scroll and the movable scroll toward the center side;
The first and second intermediate compression chambers move from a state adjacent to the non-mounting region to a state not adjacent as the compression stroke proceeds,
In the state where the first and second intermediate compression chambers are not adjacent to the non-mounting region, at least a part of the opening of the communication path is located in the first and second intermediate compression chambers.

  According to the present invention, in a scroll type compressor having a stepped portion on a substrate portion of a fixed scroll and a movable scroll, and having a stepped portion engaged with the stepped portion on a spiral wall, the end of the spiral wall is provided on the scroll compressor. A first intermediate compression chamber formed by providing a seal member and sealing between the substrate portion and an inner surface of the spiral wall of the fixed scroll and an outer surface of the spiral wall of the movable scroll are in contact with each other A second intermediate compression chamber formed by abutting an inner surface of the spiral wall in the movable scroll and an outer surface of the spiral wall in the fixed scroll; a discharge chamber into which the compressed refrigerant is discharged; A communication passage that communicates the first and second intermediate compression chambers is provided, and the seal member is mounted in a predetermined range from the outer end of the spiral wall of the fixed scroll and the movable scroll toward the center side. There providing the non-attachment area.

  The first intermediate compression chamber is adjacent to the non-mounting area where the seal member is not mounted on the spiral wall of the fixed scroll, and the second intermediate compression chamber is mounted on the spiral wall of the movable scroll. In the state adjacent to the non-attached region, when the liquid compression occurs, the liquid state refrigerant can be released from the first and second intermediate compression chambers to the outside of the spiral wall through the non-attached region. Further, as the compression stroke proceeds, the first and second intermediate compression chambers move from the adjacent state to the non-attached region to the non-adjacent state, and the first and second intermediate compression chambers are adjacent to the non-attached region, respectively. In the completely sealed state, at least a part of the opening of the communication passage is located in the first and second intermediate compression chambers, so that the refrigerant in the first and second intermediate compression chambers is passed through the communication passage. It can be reliably discharged into the discharge chamber.

  Accordingly, the first and second intermediate compression chambers have a simple configuration in which a communication passage that communicates between the first and second intermediate compression chambers and the discharge chamber is provided and at least a part thereof is opened to the first and second intermediate compression chambers. In the state where the intermediate compression chamber and the non-mounting area are not adjacent to each other, the refrigerant at the time of liquid compression can be surely and easily released to the discharge chamber. Therefore, a refrigerant is discharged at the time of liquid compression by providing a back pressure mechanism. Compared to the conventional technology, the number of parts can be reduced, and the size and weight can be reduced.

  In other words, even when liquid compression occurs, the liquid refrigerant can be reliably discharged from the first and second intermediate compression chambers (compression chambers) to the outside over the entire operation range of the scroll compressor. An excessive load is not applied to the movable scroll, and the movable scroll can be operated smoothly.

  Further, the length of the seal member attached to the spiral wall of the movable scroll is set to be different from the length of the seal member attached to the spiral wall of the fixed scroll, and at least one of the first and second intermediate compression chambers is set. In the state where one of them is not adjacent to the non-mounting region and at least a part of the opening of the communication path is not located in the first and second intermediate compression chambers, the stepped portion and the stepped portion are not It is good to be in a meshing state. Thereby, when the stepped portion and the stepped portion are in the non-meshing state, the first intermediate compression chamber and the second intermediate compression chamber communicate with each other, so that at least the first and second intermediate compression chambers If either one is adjacent to the non-wearing area, the refrigerant can be reliably discharged to the outside through the non-wearing area at the time of liquid compression. Moreover, since the non-mounting area | region of any one of a fixed scroll and a movable scroll can be reduced by varying the length of a sealing member, the compression efficiency of the gas compression chamber comprised by two spiral walls is improved. be able to.

  Furthermore, by forming the seal member attached to the spiral wall of the movable scroll longer than the seal member attached to the spiral wall of the fixed scroll, the spiral wall of the fixed scroll is in the movable scroll when the movable scroll is turned. When it protrudes to the outer peripheral side of a board | substrate part, if the sealing member is mounted | worn in the protruded site | part, it will become easy to be damaged by contact with this board | substrate part. Therefore, by setting the length of the seal member attached to the fixed scroll short in advance, the damage can be prevented and durability can be improved, and a non-attachment area is provided to apply excessive pressure during liquid compression. Can be prevented.

  According to the present invention, the following effects can be obtained.

  That is, the first intermediate compression chamber formed by abutting the inner surface of the spiral wall in the fixed scroll and the outer surface of the spiral wall in the movable scroll, the inner surface of the spiral wall in the movable scroll, and the fixed scroll A second intermediate compression chamber formed by abutting the outer surface of the spiral wall in the chamber, a discharge passage through which the compressed refrigerant is discharged, and a communication passage communicating the first and second intermediate compression chambers. In the state where the first and second intermediate compression chambers are adjacent to the non-mounting region, when liquid compression occurs, the liquid state is transferred from the first and second intermediate compression chambers to the outside of the spiral wall through the non-mounting region. It becomes possible to let the refrigerant escape. On the other hand, as the compression stroke proceeds, the first and second intermediate compression chambers shift from the adjacent state to the non-attached region to the non-adjacent state, and the first and second intermediate compression chambers are adjacent to the non-attached region, respectively. In the completely sealed state, at least a part of the opening of the communication passage is located in the first and second intermediate compression chambers, so that the refrigerant in the first and second intermediate compression chambers is passed through the communication passage. It can be reliably discharged into the discharge chamber.

  As a result, in a state where the first and second intermediate compression chambers are not adjacent to the non-mounting area with a simple configuration of providing a communication path that communicates the first and second intermediate compression chambers and the discharge chamber, Therefore, the number of parts can be reduced as compared with the conventional technique in which the refrigerant is discharged at the time of liquid compression by providing a back pressure mechanism. At the same time, it is possible to reduce the size and weight.

1 is an overall cross-sectional view of a scroll compressor according to an embodiment of the present invention. In the scroll compressor shown in FIG. 1, it is a schematic plan view which shows the state which combined the movable scroll wall of the movable scroll with respect to the fixed scroll. The orbiting scroll in the scroll compressor of FIG. 2 turns, the first and second stepped portions are separated from the second and first stepped portions, respectively, and the first intermediate compression chamber and the second intermediate compression chamber communicate with each other. It is a schematic plan view which shows the state which carried out. FIG. 4 is a schematic plan view showing a state where a movable scroll in the scroll compressor of FIG. 3 is further swung and a gas compression chamber is divided into a first intermediate compression chamber and a second intermediate compression chamber.

  A preferred embodiment of a scroll compressor according to the present invention will be described in detail below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates a scroll compressor according to an embodiment of the present invention.

  As shown in FIG. 1, the scroll compressor 10 includes a front housing 12 formed in a lid shape and a rear housing 14 formed in a cup shape, and on the outer peripheral side of the rear housing 14, For example, a suction port 16 for introducing a gas composed of a refrigerant or the like into the interior and a discharge port (not shown) through which the compressed gas compressed in the rear housing 14 is led out are formed. Then, a fixed scroll 18 and a movable scroll 20 that turns with respect to the fixed scroll 18 are inserted into the rear housing 14 from the opened one end side (in the direction of arrow A).

  The front housing 12 includes a cylindrical portion 22 that is formed at one end portion thereof and supports a rotating shaft 118 of a driving portion 117 described later, and a connecting portion 24 that is enlarged in diameter with respect to the cylindrical portion 22 and connected to the rear housing 14. Have.

  The rear housing 14 is formed in, for example, a bottomed cylindrical shape, and has a large diameter portion 26 formed on one end side (in the direction of arrow A) of the opening, and the other end portion side (arrow) with respect to the large diameter portion 26. A small-diameter portion 28 formed in the B direction and having a reduced diameter, and a gas discharge chamber 30 formed at the other end adjacent to the small-diameter portion 28. The gas discharge chamber 30 communicates with a discharge port (not shown).

  The large-diameter portion 26 has, for example, an inner peripheral surface having a substantially constant diameter along the axial direction (the directions of arrows A and B), and the connecting portion 24 of the front housing 12 abuts on the front end portion thereof. The first locating pin 34 is fitted through the first locating hole 32. Then, with the one end portion of the first locating pin 34 being press-fitted into the rear housing 14, the other end portion of the first locating pin 34 is fitted into the first fitting hole 36 formed in the connecting portion 24 of the front housing 12. Thus, the front housing 12 is positioned in the circumferential direction with respect to the rear housing 14. In this positioned state, the front housing 12 and the rear housing 14 are connected to each other by the first fastening bolts 38.

  On the other hand, a suction port 16 penetrating toward the inner peripheral side is formed on the outer peripheral surface formed in the large diameter portion 26, and a gas suction chamber 40 formed between the fixed scroll 18 and the fixed spiral wall 48. Gas is introduced.

  The small-diameter portion 28 has an inner peripheral surface that is small in diameter with respect to the inner peripheral diameter of the large-diameter portion 26 and extends along the axial direction (the directions of arrows A and B), and has a predetermined depth along the axial direction. It is formed. That is, the large-diameter portion 26 and the small-diameter portion 28 are formed in a stepped shape in which the inner peripheral surface has a step in the radial direction.

  The rear housing 14 is provided with a second locating hole 42 extending in the axial direction of the rear housing 14 at a position on the outer peripheral side of the gas discharge chamber 30, and one end of the second locating pin 44 is press-fitted. The

  The fixed scroll 18 includes a fixed-side substrate portion 46 and a fixed-side spiral wall 48 erected from the fixed-side substrate portion 46 toward the movable scroll 20 (in the direction of arrow A) and formed in a spiral shape. The fixed-side substrate portion 46 is formed, for example, in a disc shape having a predetermined thickness, and a compressed gas outlet hole 50 communicating from the gas compression chamber 116 (described later) to the gas discharge chamber 30 is axially disposed at a substantially central portion thereof. A plurality of relief passages 52 a and 52 b are formed so as to penetrate in the direction of arrows A and B and substantially parallel to the compressed gas outlet hole 50. The relief passages 52 a and 52 b are formed at a predetermined distance in the radially outward direction with respect to the compressed gas outlet hole 50, penetrate from the surface of the fixed-side substrate portion 46 to the rear surface, and are centered on the compressed gas outlet hole 50. As a pair, they are formed one by one at positions separated by an equal distance in the radially outward direction (see FIG. 2). The fixed-side substrate portion 46 is housed inside the large-diameter portion 26 of the rear housing 14.

  On the back surface of the fixed-side substrate portion 46, an insertion insertion portion 54 that protrudes at a predetermined height along the axial direction (the direction of arrow B) and has a smaller diameter than the outer edge portion of the fixed-side substrate portion 46 is formed. The portion 54 is inserted into the small-diameter portion 28 of the rear housing 14, and its end surface abuts against the inner wall surface of the rear housing 14.

  A second fitting hole 56 that opens toward the rear housing 14 (in the direction of arrow B) is formed on the end face of the fitting insertion portion 54, and the second fitting hole 56 that is press-fitted into the second locating hole 42 of the rear housing 14. The other end of the two locate pins 44 is fitted. Accordingly, the fixed scroll 18 is positioned in the circumferential direction with respect to the rear housing 14, and in this positioned state, a plurality of second fastening bolts 58 inserted from the other end side of the rear housing 14 into the bolt holes are provided. They are connected to each other by being screwed into the insertion portion 54.

  In the center of the insertion portion 54, a concave portion 60 is formed which is recessed from the end surface of the insertion portion 54 toward the fixed side substrate portion 46 (in the direction of arrow A). The concave portion 60 and the fixed side substrate portion 46 are connected to each other. A compressed gas outlet hole 50 is formed so as to penetrate therethrough. The recessed portion 60 is provided so as to face the gas discharge chamber 30 of the rear housing 14, and the compressed gas outlet hole 50 is closed inside thereof, and the compressed gas compressed in the gas compression chamber 116 has a predetermined pressure. In this case, a discharge valve 62 that opens and discharges the compressed gas to the gas discharge chamber 30 is provided.

  In addition, one end portions of the relief passages 52a and 52b are opened on the bottom surface of the recess 60, and a relief valve 64 is provided in the opening portion so as to be freely opened and closed. As with the discharge valve 62, the relief valve 64 is provided with one end fixed to the bottom surface of the recess 60 with a bolt 66 and the other end being tiltable. Then, the other end of the relief valve 64 abuts against the opening of the relief passages 52a and 52b and closes, whereby the communication between the recess 60 (the gas discharge chamber 30) and the gas compression chamber 116 is blocked through the relief passages 52a and 52b. Is done. On the other hand, when a gas having a predetermined pressure is introduced into the relief passages 52 a and 52 b through the gas compression chamber 116, the other end portion of the relief valve 64 is pressed in a direction away from the bottom surface of the recess 60 by the pressure. And the gas discharge chamber 30 communicate with each other.

  Furthermore, an annular groove is formed on the outer peripheral surface of the insertion portion 54 in the vicinity of the approximate center along the axial direction (directions of arrows A and B), and an annular seal ring 68 is attached to the annular groove. The seal ring 68 is formed, for example, from an elastic material such as rubber so as to have a circular cross section, and comes into contact with the inner peripheral surface of the small-diameter portion 28 in the rear housing 14, so The flow of the compressed gas through the small diameter portion 28 is blocked.

  On the other hand, as shown in FIGS. 1 to 4, the surface of the fixed side substrate portion 46 facing the movable scroll 20 is formed in a predetermined range from the central portion having the compressed gas outlet hole 50 toward the outer end side. The first fixed-side bottom surface portion 70 and the second fixed-side bottom surface portion 70 formed on the outer end side (in the direction of arrow D in FIG. 2) along the fixed-side spiral wall 48. A fixed-side bottom surface portion 72. The second fixed-side bottom surface portion 72 is formed to be recessed by a predetermined height on the back surface side (arrow B direction) with respect to the first fixed-side bottom surface portion 70, and the first fixed-side bottom surface portion 70 and the second fixed-side surface The bottom surface portion 72 extends in a direction orthogonal to the axial direction of the fixed scroll 18 and is formed substantially parallel to each other.

  That is, the surface of the fixed-side substrate portion 46 is formed in a stepped shape in the axial direction (in the directions of arrows A and B) by the first fixed-side bottom surface portion 70 and the second fixed-side bottom surface portion 72, and the first fixed side A first stepped portion 74 bulging in a semicircular cross section toward the center side (in the direction of arrow C in FIG. 2) is formed at the boundary portion between the bottom surface portion 70 and the second fixed side bottom surface portion 72. The The first step portion 74 is formed by a wall surface standing along the axial direction (arrow A, B direction) of the fixed scroll 18.

  The fixed-side spiral wall 48 is formed in a spiral shape so that the diameter gradually increases from the central portion of the fixed-side substrate portion 46 in the radially outward direction, and is formed on the compressed gas outlet hole 50 side serving as the central portion. It has the 1st fixed side wall part 76 and the 2nd fixed side wall part 78 which continued to this 1st fixed side wall part 76 and was formed in the outer end part side (arrow D direction in FIG. 2). The second fixed side wall portion 78 is formed with a height higher than the first fixed side wall portion 76 with respect to the fixed side substrate portion 46. That is, the fixed-side spiral wall 48 is formed in a stepped shape from the first fixed side wall portion 76 and the second fixed side wall portion 78. At the end of the second fixed side wall portion 78, a first stepped portion 80 is formed that bulges in a substantially semicircular cross section toward the first fixed side wall portion 76 side (in the direction of arrow C in FIG. 2). . Further, first and second tip seals (seal members) 82 and 84 are respectively attached to the upper ends of the first and second fixed side wall portions 76 and 78, respectively, and when assembled to the movable scroll 20, the movable side. The gas compression chamber 116 described later is kept airtight by being in sliding contact with the substrate portion 86.

  As shown in FIG. 1, the movable scroll 20 is formed in a spiral shape so as to stand upright from the movable side substrate portion 86 to the fixed scroll 18 side (in the direction of arrow B). And a movable spiral wall 88 that meshes with the lateral spiral wall 48.

  The movable substrate 86 is formed in a disk shape having a predetermined thickness, for example, and a first movable side formed on a surface facing the fixed scroll 18 within a predetermined range from the center toward the outer end. A bottom surface portion 90, and a second movable-side bottom surface portion 92 formed on the outer end side (in the direction of arrow D in FIG. 2) along the movable-side spiral wall 88 with respect to the first movable-side bottom surface portion 90; Is provided. The second movable side bottom surface portion 92 is formed to be recessed by a predetermined height in a direction (arrow A direction) away from the fixed scroll 18 with respect to the first movable side bottom surface portion 90. The second movable side bottom surface portion 92 extends in a direction orthogonal to the axial direction of the movable scroll 20 and is formed substantially parallel to each other.

  That is, the surface of the movable side substrate portion 86 includes a first movable side bottom surface portion 90 formed on the center side and a second movable side bottom surface portion 92 formed on the outer end side (in the direction of arrow D in FIG. 2). Are formed in a stepped shape in the axial direction (in the directions of arrows A and B), and at the boundary portion between the first movable side bottom surface portion 90 and the second movable side bottom surface portion 92, the central portion side (in FIG. 2) , The second stepped portion 94 swelled in a semicircular cross section in the direction of arrow C). The second stepped portion 94 is formed by a wall surface standing along the axial direction of the movable scroll 20 (the directions of arrows A and B in FIG. 1).

  Further, as shown in FIG. 1, the movable side substrate portion 86 is formed with a circular concave portion 96 opened at the back side (in the direction of arrow A) in the center portion, and a swivel bearing 98 is interposed in the inside thereof. The bush 100 is inserted so as to be rotatable.

  Furthermore, a pair of engaging recesses 102 that allow the movable scroll 20 to reciprocate only in the radial direction are formed on the back side of the movable substrate 86 (in the direction of arrow A). An Oldham ring 104 that restricts the rotation of the movable scroll 20 and allows the movable scroll 20 to turn is slidably engaged.

  As shown in FIGS. 1 to 4, the movable spiral wall 88 is formed in a spiral shape so as to gradually increase in diameter from the center of the movable substrate 86 toward the radially outward direction. And a second movable side wall portion 108 that is continuous with the first movable side wall portion 106 and formed on the outer end side (in the direction of arrow D in FIG. 2). The second movable side wall portion 108 is formed with a height higher than the first movable side wall portion 106 with respect to the movable side substrate portion 86. That is, the movable side spiral wall 88 is formed in a stepped shape from the first movable side wall portion 106 and the second movable side wall portion 108. A second stepped portion 110 bulging in a substantially semicircular cross section toward the first movable sidewall portion 106 (in the direction of arrow C in FIG. 2) is formed at the end of the second movable sidewall portion 108. .

  Also, third and fourth tip seals (seal members) 112 and 114 are mounted on the upper ends of the first and second movable side wall portions 106 and 108, respectively, and are fixed when assembled to the fixed scroll 18. The gas compression chamber 116 described later is kept airtight by being in sliding contact with the side substrate portion 46. The fourth tip seal 114 is formed longer than the second tip seal 84 provided on the fixed scroll 18.

  In the rear housing 14, the movable-side spiral wall 88 is disposed so as to be on the fixed scroll 18 side (arrow B direction), and the fixed-side substrate portion 46 and the fixed-side spiral wall 48 constituting the fixed scroll 18, A gas compression chamber 116 is formed by the movable side substrate portion 86 and the movable side spiral wall 88 constituting the movable scroll 20.

  At this time, the first fixed side wall portion 76 of the fixed scroll 18 is arranged so as to face the first movable side bottom surface portion 90 of the movable scroll 20, and the second fixed side wall portion 78 is arranged to face the second movable side bottom surface portion 92, On the other hand, the first movable side wall portion 106 of the movable scroll 20 is arranged so as to face the first fixed side bottom surface portion 70 of the fixed scroll 18, and the second movable side wall portion 108 is arranged to face the second fixed side bottom surface portion 72. . Further, the first stepped portion 80 of the fixed scroll 18 is disposed so as to face the second stepped portion 94 of the movable scroll 20, and the second stepped portion 110 of the movable scroll 20 is arranged so as to face the first stepped portion of the fixed scroll 18. It arrange | positions so that the level | step-difference part 74 may be faced (refer FIG. 2).

  As shown in FIG. 1, the drive unit 117 includes a rotary shaft 118, a bush 100 connected to an end of the rotary shaft 118, and first and second bearings 120 that rotatably support the rotary shaft 118. , 122 and a swivel bearing 98 that rotatably supports the bush 100. The rotating shaft 118 has a shaft portion 124 that is one end thereof inserted into the cylindrical portion 22 of the front housing 12 and is rotatably supported via the first bearing 120.

  The rotating shaft 118 includes a shaft portion 124 having a substantially constant diameter and a support body 126 provided at an end portion of the shaft portion 124 and having an enlarged diameter. The shaft portion 124 is one end side of the front housing 12 (in the direction of arrow A). ), And the support 126 is disposed on the other end side (in the direction of arrow B) of the front housing 12 on the fixed scroll 18 side. The shaft portion 124 protrudes from the one end portion of the front housing 12 by a predetermined length, and a pulley (not shown) is attached. Further, the cylindrical portion 22 of the front housing 12 is closed by a cover member 128 mounted between the outer peripheral side of the shaft portion 124 and the front housing 12.

  A crank pin 130 that protrudes toward the movable scroll 20 (in the direction of arrow B) and is eccentric with respect to the axis of the support 126 is provided on the end surface of the support 126. The crank pin 130 is inserted into an eccentric hole 138 of the bush 100, which will be described later, and a locking ring 132 is attached to a groove formed at the end thereof, thereby preventing the bush 100 from coming off from the crank pin 130. Made.

  The bush 100 includes, for example, a disc-shaped main body portion 134 having a predetermined length in the axial direction, and a balance weight portion 136 extending radially outward from the outer peripheral surface of the main body portion 134. An eccentric hole 138 is formed in the position 134 that is eccentric in the radially outward direction from the center. Then, the crank pin 130 is inserted into the eccentric hole 138 from one end surface side which is the drive unit 117 side (arrow A direction).

  By inserting the crank pin 130 into the eccentric hole 138 of the bush 100, the rotary shaft 118 is turned so as to be able to swing, and thereby the movable scroll 20 is turned while changing the turning radius. The support 126 is rotatably supported by a second bearing 122 provided inside the front housing 12.

  The drive unit 117 is rotated by a rotational force transmitted from a rotational drive source such as an engine to a pulley (not shown) attached to one end of the rotary shaft 118 via a belt. To do.

  The scroll compressor 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described with reference to FIGS. 2 to 4 are schematic plan views showing the meshing state of the fixed-side spiral wall 48 in the fixed scroll 18 and the movable-side spiral wall 88 in the movable scroll 20, and the shape of the fixed scroll 18 is shown by a solid line, The shape of the movable scroll 20 is indicated by a broken line.

  First, when the rotational force is transmitted to the rotary shaft 118 shown in FIG. 1 under the operation of the electromagnetic clutch, the support 126 is rotated through the first bearing 120, thereby being fixed to the support 126. The crank pin 130 turns in a state of being eccentric with respect to the axis of the rotating shaft 118. As a result, the bush 100 rotates via the crank pin 130, the Oldham ring 104 slides, and its rotation is restricted, so that the movable scroll 20 pivots with respect to the fixed scroll 18 in a state where rotation is restricted. To do.

  The gas supplied from the suction port 16 is introduced into the rear housing 14 and is formed between the fixed-side spiral wall 48 of the fixed scroll 18 and the movable-side spiral wall 88 of the movable scroll 20. 116, the movable scroll wall 88 of the movable scroll 20 turns while contacting the fixed scroll wall 48 of the fixed scroll 18 to compress the gas in the gas compression chamber 116 formed therebetween. However, it advances toward the center side (in the direction of arrow C in FIG. 2).

  For example, in the process of compressing the gas under the swiveling action of the movable scroll 20, in the state shown in FIG. 2, the first and second stepped portions 80 and 110 are in relation to the second and first step portions 94 and 74, respectively. Therefore, the first intermediate compression chamber R1 surrounded by the outer peripheral side of the first stepped portion 80 and the movable spiral wall 88, and the outer peripheral side of the second stepped portion 110 and the fixed spiral The second intermediate compression chamber R2 surrounded by the wall 48 is not divided and is in communication with each other. That is, the first intermediate compression chamber R1 and the second intermediate compression chamber R2 can be regarded as an annular single gas compression chamber 116.

  In addition, since the outer end portion 84a of the second tip seal 84 in the fixed scroll 18 is disposed at a position that is closer to the inner end portion side (in the direction of arrow C) than the outer end portion 78a of the second fixed side wall portion 78, On the outer peripheral side of the first intermediate compression chamber R1, a region T1 which is a part thereof is adjacent to a non-mounting region S1 where the second chip seal 84 is not mounted. Therefore, a minute gap is generated in the region T <b> 1 between the second fixed side wall portion 78 and the second movable side bottom surface portion 92.

  Similarly, since the outer end portion 114a of the fourth tip seal 114 in the movable scroll 20 is disposed at a position that is closer to the inner end portion side (arrow C direction) than the outer end portion 108a of the second movable side wall portion 108, On the outer peripheral side of the second intermediate compression chamber R2, a region T2 which is a part thereof is adjacent to a non-mounting region S2 where the fourth chip seal 114 is not mounted. Therefore, a minute gap is generated in the region T <b> 2 between the second movable side wall portion 108 and the second fixed side bottom surface portion 72.

  Next, when the movable scroll 20 further turns with respect to the fixed scroll 18, the second stepped portion 110 is further separated from the first stepped portion 74 as shown in FIG. 94 is further separated from the first stepped portion 80. At this time, the second stepped portion 110 of the movable scroll 20 moves along a locus that is substantially circular with respect to the first stepped portion 74 of the fixed scroll 18, and the second stepped portion 94 is also moved to the first stepped portion 80. Move along a locus that is relatively circular.

  As the movable scroll 20 turns, the gas is compressed in the first and second intermediate compression chambers R1 and R2, and the second movable side wall 108 is moved at the position of the outer end 114a of the fourth tip seal 114. Since the non-mounting region S2 and the second intermediate compression chamber R2 are not adjacent to each other by coming into contact with the outer peripheral side of the second fixed side wall portion 78, the outer peripheral side of the second intermediate compression chamber R2 is sealed by the fourth tip seal 114. It becomes a state. In other words, there is no region T2 where the second intermediate compression chamber R2 and the outer peripheral side of the fixed-side spiral wall 48 communicate with each other through a minute gap.

  On the other hand, the non-mounting region S1 in the fixed scroll 18 is still in a position adjacent to the first intermediate compression chamber R1, and therefore, between the second fixed side wall portion 78 and the second movable side bottom surface portion 92 in the region T3. There is a minute gap.

  Also in this case, since the two first intermediate compression chambers R1 and the second intermediate compression chamber R2 are not completely divided and are in communication with each other, the second intermediate compression chamber R1 is interposed via the first intermediate compression chamber R1. R 2 communicates with the outer peripheral side of the fixed spiral wall 48.

  When the movable scroll 20 further turns with respect to the fixed scroll 18 from the state shown in FIG. 3 as described above, the first and second stepped portions 80 and 110 become the second and first step portions as shown in FIG. First intermediate compression chamber R1 which begins to abut against the outer end portions of 94 and 74 and is surrounded by the inner peripheral side of the first stepped portion 80 and the movable spiral wall 88, and the second stepped portion. 110 is completely divided into two intermediate compression chambers R2 surrounded by the inner circumferential side of 110 and the fixed spiral wall 48, and the internal gas is further compressed in the first and second intermediate compression chambers R1 and R2. The

  At this time, the first intermediate compression chamber R1 is also not adjacent to the non-mounting region S1 in the fixed scroll 18, so that the first and second intermediate compression chambers R1, R2 are completely separated by the second and fourth tip seals 84, 114. A sealed airtight state is achieved, and a pair of relief passages 52a and 52b are opened in the first and second intermediate compression chambers R1 and R2, respectively.

  In the scroll compressor 10, the gas compression chamber 116 is divided into a first intermediate compression chamber R 1 and a second intermediate compression chamber R 2 under the turning action of the movable scroll 20 with respect to the fixed scroll 18, and the first intermediate compression chamber R 2. While changing the state in which the compression chamber R1 and the second intermediate compression chamber R2 are connected and integrated with each other, the gas compression chamber 116 is gradually advanced toward the center side (in the direction of arrow C) and supplied to the inside thereof. The compressed gas is compressed. Thereafter, the compressed gas compressed is led out from the compressed gas outlet hole 50 to the gas discharge chamber 30 and discharged to a refrigerant circulation system (not shown) through a discharge port (not shown).

  During normal operation of the scroll compressor 10 as described above, as shown in FIG. 1, the other end of the relief valve 64 contacts the bottom surface of the recess 60, and the opening ends of the relief passages 52a and 52b are opened. Since it is blocked, the gas compression chamber 116 and the gas discharge chamber 30 do not communicate with each other.

  Next, the operation at the time of liquid compression in which a liquid refrigerant is introduced into the gas compression chamber 116 will be described with reference to FIGS. Since the operation of the scroll compressor 10 is the same as that described above, a detailed description thereof is omitted.

  First, in the initial operation state of the scroll compressor 10 shown in FIG. 2, the first and second intermediate compression chambers R <b> 1 and R <b> 2 constituting the gas compression chamber 116 have second and fourth tip seals on the outer peripheral side, respectively. The non-mounting regions S1 and S2 where 84 and 114 are not mounted are adjacent to each other, and the two first intermediate compression chambers R1 and R2 are not completely divided and communicate with each other. .

  Therefore, when liquid compression occurs, a minute gap between the second fixed side wall portion 78 and the second movable side bottom surface portion 92 and between the second movable side wall portion 108 and the second fixed side bottom surface portion 72. The refrigerant in the liquid state can be discharged through the gas suction chamber 40 outside the fixed-side spiral wall 48.

  Next, in the operation state of the scroll compressor 10 shown in FIG. 3, the second intermediate compression chamber R2 is not adjacent to the non-mounting region S2, and the second movable side wall portion 108 and the second fixed side bottom surface portion. The first intermediate compression chamber R1 is still adjacent to the non-mounting area S1, and there is no space between the second fixed side wall portion 78 and the second movable side bottom surface portion 92. Have a very small gap. In this state, since the first and second stepped portions 80 and 110 are not in contact with the second and first stepped portions 94 and 74, respectively, the two first intermediate compression chambers R1 and the second intermediate compression chambers R2 and R2 are not completely divided and are in communication with each other.

  Therefore, the refrigerant in the liquid state is discharged from the first intermediate compression chamber R1 to the outside of the fixed spiral wall 48 through the gap, and from the second intermediate compression chamber R2 through the first intermediate compression chamber R1 to the fixed side. After being discharged to the outside of the spiral wall 48, it is discharged to the outside through the gas suction chamber 40.

  Finally, as shown in FIG. 4, the first intermediate compression chamber R1 and the second intermediate compression chamber R2 are completely divided into two under the swiveling action of the movable scroll 20, and the first intermediate compression chamber R1 and When the second intermediate compression chamber R2 and the non-mounting regions S1, S2 are not adjacent to each other, the first and second intermediate compression chambers R1, R2 and the relief passages 52a, 52b communicate with each other. The refrigerant is circulated to the gas discharge chamber 30 side through the relief passages 52a and 52b, and the other end of the relief valve 64 is separated and opened to discharge the refrigerant to the gas discharge chamber 30.

  As described above, in the present embodiment, the fixed spiral wall 48 in the fixed scroll 18 has the first stepped portion 80, and the movable scroll wall 88 in the movable scroll 20 has the second stepped portion 110. In the scroll compressor 10, a plurality of relief passages 52 a and 52 b that can communicate with the gas discharge chamber 30 are formed in the fixed-side substrate portion 46 of the fixed scroll 18 and divided into two under the swiveling action of the movable scroll 20. When the first intermediate compression chamber R1 and the second intermediate compression chamber R2 thus formed are completely sealed, the relief valve 64 is opened to provide the first and second intermediate compression chambers R1. , R2 and the gas discharge chamber 30 can be communicated with each other.

  Accordingly, the first and second intermediate compression chambers R1 and R2 are not adjacent to the non-mounting regions S1 and S2 where the second and fourth chip seals 84 and 114 are not mounted and are completely sealed. Even when compression occurs, the relief valve 64 is opened as the pressure increases, and each relief passage 52a is opened at least partially in the first and second intermediate compression chambers R1, R2 with the refrigerant in the liquid state. , 52b can be discharged into the gas discharge chamber 30. As a result, the fixed scroll 18 is provided with relief passages 52a and 52b and a relief valve 64, and even when excessive pressure is generated in the gas compression chamber 116 during liquid compression, it is reliably and easily released to the outside. Since it can be released, the number of parts can be reduced and the size and weight can be reduced as compared with the conventional technique in which the refrigerant is discharged during liquid compression by providing the back pressure mechanism.

  In addition, when at least one of the first and second intermediate compression chambers R1 and R2 is adjacent to the non-mounting regions S1 and S2, the end portions of the fixed-side spiral wall 48 and the movable-side spiral wall 88 are disposed at the end. Since a minute gap is generated, even when liquid compression occurs, the refrigerant can escape through the gap to the outer peripheral side of the fixed-side spiral wall 48 and the movable-side spiral wall 88 and be discharged to the gas suction chamber 40. it can.

  As described above, in the scroll compressor 10 described above, even when liquid compression occurs, the refrigerant in the liquid state is sucked from the first and second intermediate compression chambers R1 and R2 (gas compression chamber 116) over the entire operation range. Since the gas can be reliably discharged to the chamber 40 and the gas discharge chamber 30, an excessive load is not applied to the fixed scroll 18 and the movable scroll 20, and it can be operated smoothly.

  Further, the first intermediate compression chamber R1 formed by contacting the inner wall surface of the second fixed side wall portion 78 in the fixed scroll 18 and the outer wall surface of the second movable side wall portion 108 in the movable scroll 20 and the non-mounting region S1. Between the timing at which the adjacent state is completed, the second intermediate compression chamber R2 formed by abutting the inner wall surface of the second movable side wall portion 108 and the outer wall surface of the second fixed side wall portion 78, and the non-mounting region S2. There is a time difference between the timing at which the adjacent state is completed, and either the adjacent state between the first intermediate compression chamber R1 and the non-attached region S1 or the adjacent state between the second intermediate compression chamber R2 and the non-attached region S2. In a state where only one of them is completed, at least a part of the relief passages 52a and 52b may be arranged so as to be in the first and second intermediate compression chambers R1 and R2.

  Thus, in a state where the first and second stepped portions 80 and 110 are not in contact with the second and first stepped portions 94 and 74, the first intermediate compression chamber R1 and the second intermediate compression chamber R2 are Since the communication state is established, if at least one of the first and second intermediate compression chambers R1 and R2 is adjacent to the non-mounting regions S1 and S2, the refrigerant is surely discharged to the outside through the gap during liquid compression. And can be discharged. Further, the length of the fourth tip seal 114 provided on the movable-side spiral wall 88 and the length of the second tip seal 84 provided on the fixed-side spiral wall 48 are made different from each other, whereby the fixed scroll 18 and the movable scroll 20. Therefore, it is possible to improve the compression efficiency in the gas compression chamber 116 formed between the fixed-side spiral wall 48 and the movable-side spiral wall 88. It becomes.

  Further, the fourth tip seal 114 provided on the movable-side spiral wall 88 is formed longer than the second tip seal 84 provided on the stationary-side spiral wall 48, so that the fixed scroll is fixed when the movable scroll 20 is turned. When the side spiral wall 48 protrudes to the outer peripheral side of the movable side substrate part 86 in the movable scroll 20, if the tip seal is attached to the protruding part, the side spiral wall 48 is easily damaged by contact with the movable side substrate part 86. Therefore, by setting the length of the second tip seal 84 on the fixed scroll 18 side to be short in advance, the damage can be prevented and the durability can be improved. Application of pressure can be prevented.

  The scroll compressor according to the present invention is not limited to the above-described embodiment, and can of course have various configurations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Scroll type compressor 12 ... Front housing 14 ... Rear housing 18 ... Fixed scroll 20 ... Movable scroll 30 ... Gas discharge chamber 40 ... Gas suction chamber 46 ... Fixed side board | substrate part 48 ... Fixed side spiral wall 52a, 52b ... Relief channel | path 64 ... Relief valve 74 ... First stepped portion 78a, 84a, 108a, 114a ... Outer end portion 80 ... First stepped portion 82 ... First tip seal 84 ... Second tip seal 86 ... Movable side substrate portion 88 ... Movable side Swirl wall 94 ... second step portion 110 ... second stepped portion 112 ... third tip seal 114 ... fourth tip seal 116 ... gas compression chamber R1 ... first intermediate compression chamber R2 ... second intermediate compression chambers S1, S2 ... Non-wearing area

Claims (3)

A fixed scroll provided in the housing, and a movable scroll meshed with the fixed scroll. A stepped portion formed low on the outer end side that is the opposite side, and a stepped portion formed such that the height of the spiral wall is low on the center portion side and high on the outer end side opposite to the central portion. A scroll compressor that engages and turns the stepped portion and the stepped portion,
A seal member that is attached to an end of the spiral wall facing the substrate portion and seals between the spiral wall and the substrate portion;
A first intermediate compression chamber formed by abutting an inner surface of the spiral wall in the fixed scroll and an outer surface of the spiral wall in the movable scroll;
A second intermediate compression chamber formed by abutting an inner surface of the spiral wall in the movable scroll and an outer surface of the spiral wall in the fixed scroll;
A communication path that connects the discharge chamber into which the compressed refrigerant is discharged, the first intermediate compression chamber, and the second intermediate compression chamber;
With
Providing a non-mounting region in which the seal member is not mounted in a predetermined range from the outer end of the scroll wall of the fixed scroll and the movable scroll toward the center side;
The first and second intermediate compression chambers move from a state adjacent to the non-mounting region to a state not adjacent as the compression stroke proceeds,
The scroll characterized in that at least a part of the opening of the communication path is located in the first and second intermediate compression chambers in a state where the first and second intermediate compression chambers are not adjacent to the non-mounting region, respectively. Mold compressor. The scroll compressor according to claim 1, wherein
The length of the seal member mounted on the spiral wall of the movable scroll is set to be different from the length of the seal member mounted on the spiral wall of the fixed scroll, and at least one of the first and second intermediate compression chambers. In the state where one of them is not adjacent to the non-mounting region and at least a part of the opening of the communication path is not located in the first and second intermediate compression chambers, the stepped portion and the stepped portion are not A scroll compressor characterized by being in a meshing state. The scroll compressor according to claim 2,
A scroll type compressor, wherein a seal member attached to a spiral wall of the movable scroll is formed longer than a seal member attached to the spiral wall of the fixed scroll.

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