JP6291685B2 - Scroll type fluid machinery - Google Patents

Description

  The present invention relates to a scroll type fluid machine that includes a fixed scroll and a movable scroll, and compresses or expands fluid by changing the volume of a sealed space formed by these.

  As a scroll type fluid machine, for example, a scroll type compressor as shown in Patent Document 1 is well known. This includes a scroll unit in which a movable scroll whose rotation is prevented by the rotation prevention mechanism revolves while contacting the fixed scroll, and forms a sealed space whose volume changes with the revolution between the fixed scroll and the movable scroll. Yes. In this compressor, a thrust plate is provided between the housing wall on the front housing side that receives the thrust force from the movable scroll and the rear surface of the movable scroll so as to ensure the relative slidability between the movable scroll and the housing wall. I try to intervene.

  In the compressor of Patent Document 1, the thrust plate has two pins protruding on the housing wall side, two elongated holes whose major axis directions are orthogonal to each other are formed on the thrust plate side, and 2 on the housing wall side. The pin is fixed to the housing wall side by fitting two elongated holes on the thrust plate side. As a result, the manufacturing tolerance of the pin position is absorbed, so that the thrust plate can be reliably and easily attached.

Japanese Patent Laid-Open No. 10-288169

  However, in the thrust plate mounting structure described in Patent Document 1, the movement of the thrust plate can be restricted in the radial direction of the thrust plate, but the circumferential direction of the thrust plate cannot be restricted. The thrust plate may move in the circumferential direction due to the play of the pin and the long hole. For this reason, if the gap between the outer peripheral portion of the thrust plate stored in the front housing and the inner peripheral portion of the front housing is insufficiently managed, abnormal noise caused by the collision between the outer peripheral portion of the thrust plate and the inner peripheral portion of the front housing will occur. There is a concern that the durability may be reduced due to the occurrence of this, and the wear of the pin and the long hole.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a scroll type fluid machine employing a thrust plate mounting structure capable of suppressing wear and abnormal noise of pins and pin fitting portions.

  Therefore, in the scroll type fluid machine of the present invention, the movable scroll whose rotation is prevented by the rotation prevention mechanism revolves while being in contact with the fixed scroll, and the volume changes between the fixed scroll and the movable scroll along with the revolution. And a thrust plate provided with a fitting portion that fits a pin projecting from one of the rear surface of the movable scroll or the housing wall, and a rear surface of the movable scroll, the housing wall, A scroll type fluid machine interposed between the pins, wherein three or more pins are projected and the shape of three fitting portions of the same number of fitting portions as the pins is arranged in the radial direction of the thrust plate. It has a shape that extends and has a minimum fitting gap in the circumferential direction of the thrust plate.

  According to the scroll type fluid machine of the present invention, the thrust plate can be reliably and easily attached by absorbing the manufacturing tolerance of the position of the pin protruding from the back surface of the movable scroll or one of the housing walls. In addition, since the fitting gap between the pin and the thrust plate side fitting portion is set to three places, the thrust plate can be prevented from moving along with the revolution of the movable scroll, and the pin and the thrust plate side fitting portion are The contact surface pressure can be reduced, and wear of the pin and the thrust plate side fitting portion can be suppressed. Thereby, generation | occurrence | production of unusual noise can be suppressed, and the increase in the play of a pin and a thrust plate side fitting part can be suppressed, and durability of a thrust plate and by extension, a scroll type fluid machine can be improved.

The front view of the scroll compressor which shows 1st Embodiment of this invention. AA arrow sectional drawing of FIG. The block diagram of the front housing side seen from the center housing side. The top view of the thrust plate of 1st Embodiment. The block diagram of the front housing side seen from the center housing side of 2nd Embodiment. The top view of the thrust plate of 2nd Embodiment. The top view of the thrust plate which provided the fitting part of another shape.

  Hereinafter, embodiments of the present invention will be described in detail. The scroll type fluid machine according to the present invention can be used with either a compressor or an expander. Here, an example of a compressor will be described.

A first embodiment of the present invention will be described with reference to FIGS.
1 to 4 show the overall configuration of the scroll compressor according to the first embodiment. FIG. 1 is a front view, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. FIG. 4 is a plan view of a thrust plate.

  The scroll compressor 1 includes a scroll unit 4 having a fixed scroll 2 and a movable scroll 3 that are opposed to each other in the central axis direction. As shown in FIG. 2, the fixed scroll 2 is formed by integrally forming a spiral wrap 2b on an end plate 2a. Similarly, the movable scroll 3 is formed by integrally forming a spiral wrap 3b on an end plate 3a.

  Both the scrolls 2 and 3 mesh with the spiral wraps 2b and 3b, the protruding edge of the spiral wrap 2b contacts the end plate 3a, and the protruding edge of the spiral wrap 3b contacts the end plate 2a. It is arranged as follows. A tip seal is embedded in the end edge of the spiral wraps 2b and 3b on the protruding side.

  The scrolls 2 and 3 are arranged such that the side walls of the spiral wraps 2b and 3b are partially in contact with each other with the circumferential angles of the spiral wraps 2b and 3b shifted from each other. Thereby, the fluid pocket 5 which is a crescent-shaped sealed space is formed between the spiral wraps 2b and 3b.

  The movable scroll 3 is revolved around the central axis of the fixed scroll 2 by the drive mechanism 10 and the rotation prevention mechanism 30 to prevent rotation. As a result, the volume of the fluid pocket 5 changes in the shrinking direction by moving the fluid pocket 5 formed between the spiral wraps 2b and 3b from the outer ends of the spiral wraps 2b and 3b toward the center. To do. Therefore, the fluid (for example, refrigerant gas) taken into the fluid pocket 5 from the outer end side of the spiral wraps 2b and 3b is compressed.

  In the case of an expander, the volume of the fluid pocket 5 changes in the increasing direction by moving the fluid pocket 5 from the center of the spiral wraps 2b and 3b toward the outer end. The fluid taken into the fluid pocket 5 from the center side of 2b and 3b is expanded.

  The housing of the scroll compressor 1 includes a front housing 6, a center housing 7 that integrally includes the fixed scroll 2, and a rear housing 8 that is disposed on the back side thereof.

  The front housing 6 accommodates the drive mechanism 10 of the movable scroll 3 therein, and is provided with a bearing 12 and a shaft seal portion 13 that support the drive shaft 11 of the drive mechanism 10 on one end side. A thrust receiving portion (housing wall) 14 that supports the movable scroll 3 in the thrust direction is formed on the other end side, and a thrust described later is provided between the thrust receiving portion 14 and the back surface of the end plate 3b of the movable scroll 3. A plate 40 is interposed. The front housing 6 is formed with a suction chamber (not shown) for the fluid, and the fluid is supplied from the outside to the suction chamber via a suction port 15 (see FIG. 1) provided on the outer wall of the front housing 6. Is inhaled.

  In this embodiment, the center housing 7 is formed as an outer shell of the fixed scroll 2 integrally with the fixed scroll 2. However, the fixed scroll 2 and the center housing 7 may be separate members, and the fixed scroll 2 may be accommodated and fixed in the center housing 7. The center housing 7 is closed on the rear side by the end plate 2b of the fixed scroll 2 and opened on the front side. The front side to be opened is joined to the end surface of the outer periphery of the front housing 6 on the thrust receiving portion 14 side, and is fastened by a bolt (not shown).

  The rear housing 8 is fastened to the back side of the end plate 2a of the fixed scroll 2 by a bolt 16 and forms the fluid discharge chamber 17 between the rear housing 8 and the end plate 2a. A discharge hole 18 for introducing the fluid in the fluid pocket 5 compressed by the revolving motion of the movable scroll 3 into the discharge chamber 17 is opened at the center of the end plate 2a. A valve 19 is attached. Further, a discharge port 20 (see FIG. 1) of the fluid from the discharge chamber 17 to the outside is provided on the outer wall of the rear housing 8.

  The fluid is introduced into the front housing 6 from a suction port 15 provided in the front housing 6 and taken into a fluid pocket 5 formed between the fixed scroll 2 and the movable scroll 3 of the scroll unit 4 for compression. Provided. The compressed fluid is discharged from a discharge hole 18 formed in the center of the end plate 2 a of the fixed scroll 2 to a discharge chamber 17 in the rear housing 8, and is led out to the outside through a discharge port 20. The

  The drive mechanism 10 accommodated in the front housing 6 is provided with a crank mechanism on the drive shaft 11 that is rotationally driven by a rotational drive force input from the outside, as described in, for example, Japanese Patent Application Laid-Open No. 2012-237288. The movable scroll 3 is connected via the crank mechanism.

  In the drive mechanism 10, one end side of a drive shaft 11 that is rotatably supported by a bearing 12 protrudes from the front housing 6, and a pulley 22 is attached thereto via an electromagnetic clutch 21. Accordingly, the drive shaft 11 is rotationally driven by the rotational driving force input from the pulley 22 via the electromagnetic clutch 21. The crank mechanism provided on the other end side of the drive shaft 11 includes a crank 24 pivotally supported on the inner peripheral wall of the front housing 6 via a bearing 23, and the crank 24 is eccentric with respect to the central axis of the drive shaft 11. The eccentric bush 25 is fitted to the inside of a cylindrical boss portion 26 projecting from the back surface of the end plate 3b of the movable scroll 3 via a bearing 27. Yes. A balancer weight 28 is attached to the crank mechanism.

  Accordingly, the movable scroll 3 turns by the rotation of the drive shaft 11 via the crank mechanism, and the movable scroll 3 is prevented from rotating by a rotation prevention mechanism 30 described later. The movable scroll 3 is moved around the central axis of the fixed scroll 2. Revolves and turns.

  Three or more thrust plates 40 interposed between the thrust receiving portion 14 of the front housing 6 and the back surface of the end plate 3 b of the movable scroll 3 are provided on the thrust receiving portion 14 of the front housing 6 toward the back surface of the movable scroll 3. For example, it has four notches 41a to 41d which are four fitting portions respectively fitted to the four protruding pins 31, and each notch 41a to 41d is fitted to each pin 31 as shown in FIG. By being combined, it is fixed to the thrust receiving portion 14 side. As shown in FIG. 4, the four notches 41 a to 41 d of the thrust plate 40 have a shape that extends in the radial direction of the thrust plate 40 and opens to the inner peripheral side of the thrust plate 40. Of the four notches 41a to 41d, the shape of the three notches 41a to 41c is such that the fitting gap with the pin 31 is minimized in the circumferential direction of the thrust plate 40, and the remaining one notch 41d is a shape whose fitting clearance with the pin 31 is larger than the three notches 41a to 41c.

  The rotation prevention mechanism 30 is a pin & hole type rotation prevention mechanism, and engages an engagement pin with a plurality of circular holes 32 formed near the outer peripheral portion of the back surface of the end plate 3 a of the movable scroll 3. Is configured to prevent the rotation of the movable scroll 3 when turning around the axis of the fixed scroll 2, and the four circular holes 32 are formed at substantially equal intervals in the circumferential direction, The pin 31 for fixing the plate 40 is substituted.

  In such a configuration, when the thrust plate 40 is attached to the thrust receiving portion 14, the notches 41 a to 41 d have a shape extending in the radial direction. Therefore, the variation in the distance from the center of the thrust plate 40 to each pin 31 is different. It can be absorbed by shifting 40 in the extending direction of the notches 41a to 41d (the radial direction of the thrust plate). Further, the positional displacement of the pin 41 in the circumferential direction of the thrust plate 40 also increases the fitting gap between one notch 41d and the pin 41 so that the fitting between the notch 41d and the pin 31 has play. Can be absorbed. For this reason, the manufacturing tolerance of the position of the pin 31 can be absorbed, and the notches 41a to 41d of the thrust plate 40 can be reliably and easily fitted to each pin 31.

  Furthermore, since the fitting clearance in the circumferential direction of the thrust plate 40 between the pin 31 and the three notches 41a to 41c is minimized, it is possible to prevent the thrust plate 40 from moving along with the revolving motion of the movable scroll 3. Compared with the conventional mounting structure in which the rotation prevention portion of the thrust plate has two locations, the rotation prevention force of the thrust plate 40 can be further dispersed, and the contact surface pressure between the pin 31 and the notches 41a to 41d can be reduced. Therefore, wear of the pin 31 and the notches 41a to 41d can be suppressed, an increase in play between the pin 31 and the notches 41a to 41d can be suppressed, and the durability of the thrust plate 40 and, in turn, the scroll compressor 1 can be improved. It can be improved. Moreover, since the movement of the thrust plate 40 accompanying the revolution movement of the movable scroll 3 can be prevented, the occurrence of collision between the outer peripheral portion of the thrust plate 40 and the inner peripheral portion of the front housing 6 can be prevented, and the generation of abnormal noise can be prevented. Further, since the fitting portion on the thrust plate 40 side is the notches 41a to 41d, when the thrust plate 40 is manufactured, the inner peripheral portion of the plate and the fitting portions (notches 41a to 41d) are press-molded with an integrated die. As a result, the productivity of the thrust plate 40 and the scroll compressor 1 is improved.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the thrust plate is positioned and fixed with three pins. As shown in FIGS. 5 and 6, in this embodiment, three pins 31 protrude from the thrust receiving portion 14 of the front housing 6 at substantially equal intervals in the circumferential direction. On the other hand, the thrust plate 50 of the present embodiment is formed with notches 51a to 51c, which are three fitting portions that are fitted to the three pins 31, respectively. The three notches 51a to 51c of the thrust plate 50 are the same as the notches 41a to 41c of the first embodiment, and extend in the radial direction of the thrust plate 50 and are on the inner peripheral side of the thrust plate 50 as shown in FIG. The fitting gap with the pin 31 in the circumferential direction of the thrust plate 50 is the smallest shape.

  According to the configuration of the second embodiment, since the notches 51a to 51c have a shape extending in the radial direction, the thrust plate 50 is moved in the circumferential direction in a state where the two notches are fitted to the pin 31. Can be shifted. Therefore, the manufacturing tolerances at the positions of the pins 31 can be absorbed, and the notches 51 a to 51 c of the thrust plate 50 can be reliably and easily fitted to the pins 31. And since the fitting clearance in the circumferential direction of the thrust plate 50 between the pin 31 and the three notches 51a to 51c is minimized, it is possible to prevent the thrust plate 50 from moving along with the revolving motion of the movable scroll 3. Further, as in the first embodiment, the contact surface pressure between the pin 31 and the notches 51a to 51c can be reduced, wear of the pin 31 and the notches 51a to 51c is suppressed, and the pin 31 and the notches 51a to 51c are prevented from being worn. An increase in play can be suppressed, and the durability of the thrust plate 50 and, in turn, the scroll compressor 1 can be improved. Further, the occurrence of a collision between the outer peripheral portion of the thrust plate 50 and the inner peripheral portion of the front housing 6 can be prevented, and the occurrence of abnormal noise can be prevented. Further, since the fitting portion on the thrust plate 50 side has a notch shape, the inner peripheral portion of the plate and the fitting portions (notches 51a to 51c) can be press-molded with an integral mold, and the thrust plate 50, and thus the scroll can be formed. Productivity of the mold compressor 1 is improved.

  In each of the above embodiments, the fitting portion of the thrust plate has a notch shape, but as shown in FIG. 7, long holes 61 a to 61 d extending in the radial direction of the thrust plate 60 may be used. FIG. 7 is an example in which four fitting portions are formed, but it goes without saying that the same long hole may be used even when there are three fitting portions. Needless to say, the three or more long holes have a shape that fits in the circumferential direction of the thrust plate and minimizes the gap.

  Further, in each of the above embodiments, the thrust plate fixing pin 31 is formed in the thrust receiving portion 14 of the front housing 6, but protrudes toward the thrust receiving portion 14 on the back surface of the end plate 3 a of the movable scroll 3. May be. In this case, the circular hole 32 of the rotation prevention mechanism 30 is formed in the thrust receiving portion 14. When the pin 31 is used as an engagement pin for the rotation prevention mechanism 30, the rush length of the pin 31 is regulated by the thickness of the end plate 3a of the movable scroll 3, so that the risk of the pin 31 falling off is avoided. In order to do this, it is necessary to make the end plate 3a of the movable scroll 3 sufficiently thick, which causes an increase in the weight of the scroll unit 4. Therefore, as in the present embodiment, it is preferable that the pin 31 protrudes on the front housing 6 side.

DESCRIPTION OF SYMBOLS 1 Scroll type compressor 2 Fixed scroll 3 Movable scroll 4 Scroll unit 5 Fluid pocket (sealed space)
10 Drive mechanism 14 Thrust receiving part (housing wall)
DESCRIPTION OF SYMBOLS 11 Drive shaft 12,23,27 Bearing 24 Crank 25 Eccentric bush 26 Boss part 30 Rotation prevention mechanism 31 Pin 32 Circular hole 40, 50, 60 Thrust plate 41a-41d, 51a-51c Notch part 61a-61d Long hole

Claims (4)

A movable scroll that is prevented from rotating by a rotation preventing mechanism revolves while contacting a fixed scroll, and includes a scroll unit that forms a sealed space that changes in volume with the revolution between the fixed scroll and the movable scroll, This is a scroll type fluid machine in which a thrust plate provided with a fitting portion to be fitted to a rear surface of a movable scroll or a pin protruding from one side of a housing wall is interposed between the rear surface of the movable scroll and the housing wall. And
Three or more pins are protruded, and the shape of the three fitting portions of the same number of the fitting portions as the pins extends in the radial direction of the thrust plate and the fitting gap is minimized in the circumferential direction of the thrust plate. A scroll type fluid machine characterized by having a shape as follows.   The scroll type fluid machine according to claim 1, wherein the fitting portion is a cutout portion that extends in a radial direction of the thrust plate and opens to an inner peripheral side of the thrust plate.   The scroll type fluid machine according to claim 1, wherein the fitting portion is a long hole extending in a radial direction of a thrust plate.   The rotation prevention mechanism includes a circular hole formed in one of the rear surface of the movable scroll or the housing wall, and an engagement pin projecting to engage with the circular hole on the other side. The scroll type fluid machine according to any one of claims 1 to 3, wherein the engagement pin is replaced with the pin that is fitted to a fitting portion of the thrust plate.