JP2004286025A - Scroll fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll fluid machine capable of increasing discharge amount. <P>SOLUTION: The scroll fluid machine comprises a casing; a follower scroll unit composed of at least an outer peripheral block rotatably held by the casing, and a driven lap spirally extending from the outer peripheral block to the inside; a driving unit composed of a driving lap engaged with the driven lap, a pair of end plates clipping/fixing the driving lap and slidably clipping the driven lap, and a driving shaft rotatably journaled to the casing while decentering in regard to the driven scroll unit and rotating the end plates, and defining a compressing space with the driven scroll unit; a suction hole formed on a boss and communicating to the compressing space, and a discharging hole formed on the driving shaft and communicating to the compressing space. The outer peripheral block has a pair of boss portions extending in both shaft directions, and the driven scroll unit is rotatably held in the casing by discs respectively fixed on the pair of the boss portions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll fluid machine used for a compressor, an expander, a vacuum pump, a fluid motor, and the like, and more particularly to an all-system rotary scroll fluid machine that rotates both a drive scroll and a driven scroll.

  2. Description of the Related Art As disclosed in Patent Document 1, for example, a conventional all-system rotary scroll compressor meshes spiral wraps of a driving scroll connected to a driving shaft and a driven scroll connected to a driven shaft. Thus, a closed space is defined, and the drive shaft and the driven shaft are arranged so that the axes thereof are eccentric with a predetermined width.

Thus, the driven scroll rotates in synchronization with the rotation of the driving scroll, and the closed space moves continuously from the outside to the inside while reducing the volume, thereby performing a compression action.
JP-A-64-302

  However, the pressure generated in the closed space is perpendicular to each end plate and acts in a direction to separate each end plate (hereinafter referred to as "axial force"), and wraps perpendicularly to the axis of the drive shaft and the driven shaft. A force acting on a position at half the height (hereinafter referred to as “tangential force”) is applied to a bearing that holds the drive shaft and the driven shaft.

  Further, in order to increase the discharge amount of the scroll compressor, it is necessary to increase the closed space. For this reason, when the distance between the laps in the radial direction is increased, a problem occurs in which the axial force increases, and when the height of the wrap is increased, the height at which the tangential force acts increases, and the overturning moment increases. Failure occurs. Further, this increases the load on the bearing, which causes a problem that the life of the bearing is shortened. For this reason, there is a limit in increasing the discharge amount.

  Further, since the above-mentioned overturning moment acts in the direction of overturning the end plate, it is necessary to configure a plurality of bearings for the drive shaft and the driven shaft that support the end plate in a cantilever manner. .

Therefore, an object of the present invention is to provide a scroll fluid machine capable of increasing the discharge amount.

  Therefore, the present invention provides a driven scroll unit including at least a casing, an outer peripheral block rotatably held by the casing, and a driven wrap spirally extending inward from the outer peripheral block, and meshes with the driven wrap. A driving wrap, a pair of end plates for holding and fixing the driving wrap and slidably holding the driven lap, and an end plate eccentrically rotatable to the driven scroll unit and rotatably supported by the casing. A drive shaft that defines a compression space together with the driven scroll unit, a suction hole formed in the outer peripheral block and communicates with the compression space, and a drive shaft formed in the drive shaft, It is at least constituted by a discharge hole communicating with the space. Further, the outer peripheral block has a pair of bosses extending in both axial directions, and the driven scroll unit is rotatably held by the casing by disks fixed to each of the pair of bosses. Is desirable. Further, it is desirable that the pair of end plates of the driving scroll unit be fixed to both ends of the driving wrap.

  As a result, the pair of end plates constituting the drive scroll are connected and fixed by the drive wrap, so that the axial force acting along the axial direction is canceled out, so that the bearing is used to rotatably support the drive scroll. No axial force acts on the driven scroll unit, and the driven scroll unit is sandwiched by the driving scroll unit. Therefore, the driven scroll unit is not subjected to the axial force. Both are rotatably supported on both sides in the axial direction, so that they do not become cantilevered, and the tangential force does not become an overturning moment, so that stable rotation can be obtained.

  It is preferable that the driven scroll unit and the driving scroll unit are connected so as to be synchronously rotatable by connecting means. In the above configuration, since the driven scroll unit has a predetermined frictional resistance with the driving scroll unit, the driven scroll unit can be rotated in a following manner by the rotation of the driving scroll unit. However, it is desirable to provide a connecting means in order to make the rotation of the driven scroll unit more reliable.

  Further, a cooling space is defined between the driving scroll unit and the casing, and the cooling space is desirably communicated with the outside through an intake hole and an air discharge hole. Desirably, a fan blade is formed on the plate. As a result, the heating of the apparatus itself can be prevented, so that problems due to thermal expansion and the like can be eliminated.

  Further, it is preferable that the width of the driven wrap is formed to be larger than the width of the drive wrap. As a result, the strength of the driven wrap can be improved. Further, since the drive wrap is sandwiched between the both end plates, the drive wrap can be made thin and a compression space can be secured.

  Further, it is preferable that the driven wrap is formed to be gradually thinner toward an inner distal end, and the drive wrap is formed to be gradually thinner toward an outer distal end. Further, the driven wrap may be formed to be gradually thinner toward the inner front end, and the drive wrap may be formed to be gradually thinner toward the outer front end. As a result, the balance between the strength and the capacity of the driving lap and the driven lap can be optimized.

  Therefore, according to the present invention, it is possible to efficiently receive the force acting in the direction in which the both end plates are separated by the compressed fluid and the overturning moment, thereby extending the life of the product. In addition, since the wrap can be increased, the discharge amount can be increased.

  FIG. 1 shows a scroll rotary machine (hereinafter referred to as a scroll compressor) as an embodiment of a scroll fluid machine according to the present invention, and the scroll compressor will be described below.

The casing of the scroll compressor includes a first casing 1 composed of a first bearing 1a, a second bearing 1b, and a first large-diameter cylinder 1c, and a third bearing 2a, a fourth bearing 4a. And the second casing 2 constituted by the bearing portion 2b and the second large-diameter cylindrical portion 2c are formed by joining with their opening surfaces facing each other. Further, in this casing, the first bearing portion 1a and the third bearing portion 2a are formed around the axis O ₁ -O ₁ as a central axis, and the second bearing portion 1b and the fourth bearing portion 2b are the O axis _O 2 -O ₂ provided from ₁ -O ₁ at a predetermined distance is formed as a central axis. Further, the first casing 1 is formed with a first vent hole 1e communicating between the inside and outside of the first casing, and further, between the first bearing portion 1a and the second bearing portion 1b. Similarly, a first through-hole 1d communicating the inside and outside of the first casing is formed. Similarly, the second casing 2 is formed with a second vent hole 2e communicating between the inside and the outside of the second casing, and further between the third bearing portion 2a and the fourth bearing portion 2b. Similarly, a second through-hole 2d communicating between the inside and outside of the second casing is formed.

    As shown in FIGS. 1 and 3, for example, the driven scroll unit 3 includes an outer peripheral block 30, a driven wrap 3 a that spirally extends inward from the outer peripheral block 30, and an axial direction from the outer peripheral block 30. A first boss 3b and a second boss 3c extending to both sides, a first disk 3d having the first boss fixed to 3b, and a second boss fixed to the second boss 3c. The inner peripheral surface of the first disk 3d is rotatably held by the second bearing portion 1b via a bearing 7, and the inner surface of the second disk 3e. The peripheral surface is rotatably held by the fourth bearing portion 2b via a bearing 8. The first boss 3b has a plurality of third air holes 3g formed at positions facing the first air holes 1e, and the second boss 3c has the second air holes 3g. A plurality of fourth vent holes 3h are formed at positions facing the vent holes 2e. Further, a suction hole 3f is formed through the outer peripheral block 30.

  As shown in FIGS. 1 and 2, the drive scroll unit 4 includes a drive wrap 4c that meshes with the driven wrap 3a to define a compression space 52 (shown in FIG. 4), and both ends of the drive wrap 4c. A first end plate 4a and a second end plate 4b fixed to the first end plate 4a, a first drive shaft 4f provided on the first end plate 4a, and a second drive shaft provided on the second end plate 4b 4d. Further, the first drive shaft 4f has an ejection hole 4j penetrating the drive shaft 4f. In the drive scroll unit 4 having the above-described configuration, the first drive shaft 4f is rotatably held by the first bearing portion 1a via the bearing 9, and the second drive shaft 4d is further supported via the bearing 10. And is rotatably held by the third bearing portion 2a.

  Furthermore, the discharge hole 4j communicates with a discharge port 11a formed in a shaft seal retainer 11 fixed to the first bearing 1a of the first casing 1 in the axial direction outside.

  Further, connecting mechanisms 5 and 6 as connecting means are provided at predetermined positions on the contact surface between the driving scroll unit 4 and the driven scroll unit 3, and the driven scroll unit 3 is synchronized with the rotation of the driving scroll unit 4. Is to surely perform the rotary turning movement.

  In the scroll compressor having the above configuration, when the drive scroll unit 4 is rotated by the drive shafts 4d and 4f, the driven scroll unit 3 is rotated in synchronization with the rotation, and the compression space 52 is moved, as shown in FIG. From the suction space 50 communicating with the suction hole 3f formed in the driven scroll unit 3 to the discharge space 51 communicating with the discharge hole 4j, the volume is gradually reduced by the rotational orbital movement of the drive wrap 4c and the driven wrap 3a, The fluid sucked from the suction hole 3f, for example, a gas such as air, a liquid such as water or kerosene, is sucked and compressed, and is discharged from the discharge hole 3f and further from the discharge port 11a.

  Further, in this embodiment, a cooling space 60 is defined between the driving scroll unit 4, the driven scroll unit 3, and the casings 1 and 2, and the cooling space 60 of the end plates 4a and 4b of the driving scroll unit 4 is formed. Fan blades 4k and 4l are formed on the end surface on the side, and air is sucked from the through holes 1d and 2d by the rotation of the drive scroll unit 4, and the above-described first, second, third and fourth discharges are performed. Air is discharged through the air holes 1e, 2e, 3g, 3h to cool the first, second, third, and fourth bearing portions 1a, 2a, 1b, 2b and to cool the compressed portion. .

  FIG. 4 shows an embodiment in which the driven wrap 3a of the driven scroll unit 3 is formed to be thicker than the drive wrap 4c of the drive scroll unit 4. In the present invention, since the driven wrap 3a is not supported by the end plate, the driven wrap 3a is formed thicker than the drive wrap 4c to improve the strength. In addition, the reduction in the compression space 52 caused by increasing the thickness of the driven wrap 3a can be maintained even if the drive wrap 4c is thin because the drive wrap 4c is fixed by the end plates 4a and 4b, so the drive wrap 4c is made thin. This can compensate for the decrease.

  FIG. 5 (a) shows an embodiment in which the thickness of the drive wrap 4c of the drive scroll unit 4 is reduced outward from the center of the spiral, particularly 4c1, 4c2. This is an example in which the width is gradually reduced to 4c3. FIG. 5 (b) shows an embodiment in which the driven wrap 3a of the driven scroll unit 3 is narrowed inward from the outer part, and in particular, is stepwise 3a1, 3a2, 3a3. This is an example of narrowing. Reference numeral 31 denotes a motion space of the drive wrap 4c defined by the driven scroll unit 3. As a result, the base portion 3a1 extending from the outer peripheral block 30, which must be the strongest in the driven wrap 3a, is formed thickest and becomes thinner toward the distal end. This is to reduce the load applied to the portion 3a1. Also, it is desirable to form the shape of the drive wrap 4c as shown in FIG. 5A in order to secure the compression space 52 corresponding to the shape of the driven wrap 3a.

  FIG. 6 shows an example of the formation of the driving scroll unit 4, in which a spiral mounting groove 4i is formed in the second end plate 4b of the driving scroll unit 4, and a thin spring steel plate or the like is formed in the mounting groove 4i. The wrap plate 4c1 formed of a resin plate is fitted therein, and the mounting groove 4i of the first end plate 4a is fitted into the open end of the wrap plate 4c1 as shown in FIG. 4 is formed.

  FIG. 7 shows a lap plate 4c2 formed by a plurality of plates 4c21 and 4c22 made of thin spring steel plates or resin plates in place of the lap plate 4c1 in the above method. The plates 4c21 and 4c22 may be formed of the same material, or may have different characteristics by using different materials.

  FIG. 8 shows an example in which a wrap 4c3 formed in a spiral shape in advance is mounted in the mounting groove 4i to form the drive scroll unit 4. In this case, since the wrap is formed in advance, there is an advantage that the dimensional accuracy of the wrap can be improved.

It is a sectional view of a scroll compressor concerning an example of the present invention. FIG. 2 is an exploded perspective view of the driving scroll unit according to the embodiment of the present invention. It is a perspective view of a driven scroll unit concerning an example of the present invention. It is explanatory drawing which showed the example in which the follower wrap was formed thicker than the drive wrap. (A) is an explanatory view showing an example in which the width of the drive wrap is gradually narrowed outward, and (b) is an explanatory view showing an example in which the width of the driven wrap is gradually narrowed inward. FIG. It is explanatory drawing which showed an example of formation of a driving scroll unit. It is an explanatory view showing another example of formation of a drive scroll unit. It is explanatory drawing which showed another example of formation of a drive scroll unit.

Explanation of reference numerals

1, 2 casing 3 driven scroll unit 4 driven scroll unit 5, 6 coupling mechanism 7, 8, 9, 10 bearing 11 shaft seal holder

Claims (8)

A casing,
A driven scroll unit comprising at least a peripheral block rotatably held by the casing and a driven wrap spirally extending inward from the peripheral block;
A drive lap that meshes with the driven wrap, a pair of end plates that hold and fix the drive wrap and slidably hold the driven wrap, and a rotatably supported pivotally eccentric to the driven scroll unit with respect to the driven scroll unit. A drive scroll unit comprising a drive shaft for rotating the end plate, and defining a compression space together with the driven scroll unit;
A suction hole formed in the outer peripheral block and communicating with the compression space;
A scroll fluid machine formed at the drive shaft and configured at least by a discharge hole communicating with the compression space.   The outer peripheral block has a pair of bosses extending in both axial directions, and the driven scroll unit is rotatably held on the casing by disks fixed to each of the pair of bosses. The scroll fluid machine according to claim 1, wherein   The scroll fluid machine according to claim 1, wherein the driven scroll unit and the driving scroll unit are connected so as to be synchronously rotatable by connecting means.   The cooling space is defined between the drive scroll unit and the casing, and the cooling space is communicated with the outside through an intake hole and a vent hole. Scroll fluid machinery.   The scroll fluid machine according to claim 4, wherein a fan blade for sucking and discharging air in the cooling space is formed on an end plate of the driving scroll unit.   The scroll fluid machine according to any one of the preceding claims, wherein a width of the driven wrap is formed larger than a width of the drive wrap.   7. The driven wrap according to claim 1, wherein the driven wrap is formed gradually thinner toward an inner distal end, and the drive wrap is formed gradually thinner toward an outer distal end. Scroll fluid machinery. The said driven lap is formed gradually thin toward the inside front-end | tip direction, and the said drive wrap is formed stepwise thinly toward the outside front-end | direction. 3. The scroll fluid machine according to item 1.

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