JP2005069069A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor provided with a scroll member in which transmission of force, which is applied radially to a boss part, to a spiral body is lessened. <P>SOLUTION: In the scroll member 12, on one side of an end plate 12b, the spiral body 12a is formed, and on the other side, the boss part 12c is formed, in which an eccentric bush 21 serving as a drive shaft is inserted. In the scroll member, a force-transmission-reducing means is provided in order to lessen the transmission of the force, which is applied radially to the boss part, to the spiral body. The force-transmission-reducing means may be a necking 41 formed on the outside periphery of the boss part, or other various structures. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll compressor used in a vehicle air conditioner or the like.

  A general scroll type compressor includes a pair of scroll members formed by forming a spiral body on one surface side of an end plate. These scroll members are arranged to face each other in a state where the spiral bodies are engaged with each other. During operation, the scroll members are relatively moved, and the gas taken in between the scroll members is compressed while being moved along the spiral body. Such a scroll type compressor is disclosed in Patent Document 1, for example.

  A scroll member that is moved during operation is generally called a movable scroll. In Patent Document 1, the movable scroll is integrally formed with a cylindrical boss on the other surface side of the end plate. An eccentric bush engaged with the crankshaft is fitted to the boss portion via a bearing. When the crankshaft is driven, the eccentric bush acts as a drive shaft and transmits a predetermined movement to the movable scroll.

  FIG. 1 shows a part of a conventional movable scroll. In this movable scroll 1, the end plate 3 integrated with the spiral body 2 is formed in a flat plate shape. The boss portion 4 formed integrally with the end plate 3 on the side opposite to the spiral body 2 has an inner and outer peripheral surface formed in a cylindrical shape. A bearing 5 is provided on the inner peripheral surface of the boss portion 4. When the compressor is assembled, the bearing 5 is press-fitted and fitted inside the boss portion 4.

  When the bearing 5 is press-fitted inside the boss 4, a radial force, that is, a diameter expanding force is applied to the boss 4, and the boss 4 is slightly expanded in diameter. The diameter expansion force applied to the boss 4 is transmitted to the end plate 3 as it is, and the end plate 3 is deformed as shown exaggerated in FIG. At this time, the deformation of the end plate 3 is about 40 μm, but the spiral body 2 is also deformed together with the end plate 3, so that the sealing property between the movable scroll 1 and the fixed scroll (not shown) opposed thereto is improved. It tends to be insufficient. When the sealing performance is impaired, problems such as a reduction in compression capacity and an increase in noise occur.

It is also conceivable to provide a tip seal projecting stepwise at the axial end of the spiral body. However, since it is difficult to provide a tip seal on the entire spiral body, a sufficient effect cannot be obtained for the above-described deformation of the movable scroll. In addition, the structure for providing the tip seal must be complicated.
Japanese Patent No. 3369786

  Therefore, the subject of this invention is providing the scroll type compressor provided with the scroll member which reduced that the force of the radial direction added to a boss | hub part transmitted to a spiral body.

  According to this invention, the scroll member which has an end plate, the spiral wound body formed in the one surface side of the said end plate, and the boss | hub part in which the drive shaft is inserted in the other surface side of the said end plate is included. A scroll compressor, wherein the scroll member is provided with a force transmission reducing means for reducing a radial force applied to the boss portion from being transmitted to the spiral body. Is obtained.

  The force transmission reducing means may be a constricted portion provided on an outer periphery of the boss portion.

  The constricted portion may be formed in the vicinity of the end plate.

  The force transmission reducing means may be a groove provided in the end plate corresponding to the periphery of the boss portion.

  Even if the end plate and the boss portion are formed separately, a cylindrical portion is provided on the end plate, and the cylindrical portion is fitted to a part of the boss portion to constitute the force transmission reducing means. Good.

  The end plate and the boss part are formed separately from each other, the boss part has a small-diameter convex part protruding in the axial direction, and the end plate has a hole part fitted in the convex part. And the force transmission reducing means may be configured by a fitting structure of the convex portion and the hole portion.

  The end plate and the boss portion are formed separately from each other, the end plate has a small-diameter convex portion protruding in the axial direction, and the boss portion has a hole portion that fits into the convex portion. And the force transmission reducing means may be configured by a fitting structure of the convex portion and the hole portion.

  A plurality of the fitting structures may be provided.

  In the scroll compressor according to the present invention, since the deformation of the spiral body due to the radial force applied to the boss portion of the scroll member is prevented or reduced, there is little possibility that the sealing performance between the scroll members is impaired, and therefore the compression capacity There is an advantage that reduction of noise and increase of noise can be prevented.

  A scroll compressor according to an embodiment of the present invention will be described with reference to FIG.

  The illustrated scroll compressor is suitable for use in a vehicle air conditioner, and includes a fixed scroll 11, a movable scroll 12 paired with the fixed scroll 11, a casing 13 containing these, and a casing 13. And a front housing 14 fixed to the open end and closed. The fixed scroll 11 includes a fixed spiral body 11a and a fixed end plate 11b fixed integrally to one end in the axial direction thereof. The movable scroll 12 includes a movable spiral body 12a and a movable end plate 12b fixed integrally to one end of the movable scroll 12a in the axial direction. The fixed end plate 11b and the movable end plate 12b face each other in the axial direction in a state where the fixed spiral body 11a and the movable spiral body 12a are engaged with each other, and a fluid such as a refrigerant is transported while being compressed between them. Several compression spaces 15 are formed.

  The fixed end plate 11 b is fixed to the casing 13 and forms a discharge chamber 17 between the fixed end plate 11 b and the casing 13. The fixed end plate 11 b is formed with a discharge port 18 through which the fluid compressed in the compression space 15 is discharged into the discharge chamber 17.

  Between the movable end plate 12b and the front housing 14, there is provided a rotation prevention mechanism 19 for preventing rotation of the movable scroll 12 but allowing revolution.

  Further, a cylindrical protrusion, that is, a boss 12c is integrally formed on the surface of the movable end plate 12b opposite to the movable spiral body 12a. An eccentric bush 21 serving as a drive shaft is rotatably disposed inside the boss portion 12c via a drive bearing 22.

  A main shaft or shaft 23 having a large diameter portion 23a passes through the center of the front housing 14. The shaft 23 is supported by a shaft bearing 24, and the large diameter portion 23 a is supported by a main bearing 25. The large diameter portion 23 a of the shaft 23 includes a crank pin that is engaged with the eccentric bush 21, that is, an eccentric pin 26. As a result, the eccentric bush 21 can swing around the eccentric pin 26, thereby making the turning radius of the movable scroll 12 variable. The eccentric bush 21 is provided with a counterweight 27 that opposes the centrifugal force during the operation of the movable scroll 12.

  A rotor 31 is rotatably supported via a radial bearing 29 on the outside of the cylindrical portion 14 a of the front housing 14. The rotor 31 is driven to rotate by, for example, an automobile engine. The rotor 31 is connected to the shaft 33 via the electromagnetic clutch 32. Accordingly, the shaft 23 rotates integrally with the rotor 31 when the electromagnetic clutch 32 is on, but the shaft 23 is disconnected from the rotor 31 when the electromagnetic clutch 32 is disconnected.

  When the shaft 23 rotates, the movable scroll 12 revolves on a circular orbit by the action of the eccentric pin 26, the eccentric bush 21, and the rotation prevention mechanism 19. At this time, the rotation of the movable scroll 12 is blocked by the rotation blocking mechanism 19. As a result, the compression space 15 is transferred to the center while compressing the fluid, and the fluid is discharged to the discharge chamber 17 through the discharge port 18. The fluid in the discharge chamber 17 flows out from the discharge port (not shown) into the refrigeration circuit, returns to the suction space in the casing 13 from the suction port (not shown), and is taken into the compression space 15.

  The first structure of the main part of the scroll compressor will be described with reference to FIG. 4 together with FIG.

  The boss portion 12c of the movable scroll 12 has a ring-shaped groove or constricted portion 41 formed on a part of the outer peripheral surface thereof. Naturally, the bottom portion of the constricted portion 41 has a smaller diameter than the outer peripheral surface of the boss portion 12c. The constricted portion 41 is formed at a position corresponding to the drive bearing 22.

  According to the structure of FIG. 4, radial forces such as a diameter expansion force applied to the boss portion 12 c are absorbed by the constricted portion 41, and transmission to the movable spiral body 12 a is reduced. Thus, the constricted portion 41 functions as a force transmission reducing means.

  With reference to FIG. 5, the 2nd structure of the principal part of a scroll compressor is demonstrated.

  The boss portion 12c of the movable scroll 12 has a square ring-shaped groove or constricted portion 42 formed on a part of the outer peripheral surface thereof. Naturally, the bottom portion of the constricted portion 42 has a smaller diameter than the outer peripheral surface of the boss portion 12c. Note that the constricted portion 42 is formed adjacent to the movable end plate 12b by detaching from the drive bearing 22.

  According to the structure of FIG. 5, the radial force applied to the boss portion 12c is absorbed by the constricted portion 42, and the transmission to the movable spiral body 12a is further reduced. Thus, the constricted portion 42 functions as a force transmission reducing means.

  With reference to FIG. 6, the 3rd structure of the principal part of a scroll compressor is demonstrated.

  The movable end plate 12b of the movable scroll 12 has a ring-shaped groove or constricted portion 43 formed at a position corresponding to the outer peripheral surface of the boss portion 12c.

  According to the structure of FIG. 6, the radial force applied to the boss portion 12c is absorbed by the constricted portion 43, and transmission to the movable spiral body 12a is reduced. Thus, the constricted portion 43 functions as a force transmission reducing means.

  With reference to FIG. 7, the 4th structure of the principal part of a scroll compressor is demonstrated.

  The boss 12c of the movable scroll 12 is formed separately from the movable end plate 12b and the movable spiral body 12a. An annular portion or a cylindrical portion 44 is provided on the end surface of the movable end plate 12b opposite to the movable spiral body 12a, and a part of the boss portion 12c is closely fitted to the cylindrical portion 44.

  According to the structure of FIG. 7, the radial force applied to the boss portion 12c is absorbed by the fitting structure between the cylindrical portion 44 and the boss portion 12c, and transmission to the movable spiral body 12a is reduced. Thus, the fitting structure between the cylindrical portion 44 and the boss portion 12c functions as a force transmission reducing means.

  With reference to FIG. 8, the 5th structure of the principal part of a scroll compressor is demonstrated.

  The boss 12c of the movable scroll 12 is formed separately from the movable end plate 12b and the movable spiral body 12a. And one convex part 45 is provided in the end surface on the opposite side to the movable spiral body 12a of the movable end plate 12b, and on the other hand, one through-hole or hole 46 is provided in the axial end face of the boss part 12c. The convex part 45 is closely fitted to 46. The hole 46 may be a recess.

  According to the structure of FIG. 8, the radial force applied to the boss portion 12c is absorbed by the fitting structure of the hole portion 46 and the convex portion 45, and transmission to the movable spiral body 12a is reduced. Thus, the fitting structure between the hole 46 and the convex 45 serves as a force transmission reducing means.

  With reference to FIG. 9, the sixth structure of the main part of the scroll compressor will be described.

  The boss 12c of the movable scroll 12 is formed separately from the movable end plate 12b and the movable spiral body 12a. A plurality of, for example, two convex portions 45 are provided on the end surface of the movable end plate 12b opposite to the movable spiral body 12a, while a plurality of, for example, two through holes or hole portions 46 are provided on the axial end surface of the boss portion 12c. Provided, and the convex portions 45 are closely fitted to the hole portions 46, respectively. Each hole 46 may be a recess.

  According to the structure of FIG. 9, the radial force applied to the boss portion 12c is absorbed by the fitting structure of the hole portion 46 and the convex portion 45, and transmission to the movable spiral body 12a is reduced. Thus, the fitting structure between the hole 46 and the convex 45 serves as a force transmission reducing means. In addition, the rotation of the boss portion 12 c with respect to the movable end plate 12 b is locked by the fitting structure of the plurality of hole portions 46 and the plurality of convex portions 45.

  A seventh structure of the main part of the scroll compressor will be described with reference to FIG.

  The boss 12c of the movable scroll 12 is formed separately from the movable end plate 12b and the movable spiral body 12a. Then, one recess or hole 47 is provided on the end surface of the movable end plate 12b opposite to the movable spiral body 12a, while one protrusion 48 is provided on the axial end surface of the boss portion 12c. The convex portion 48 is closely fitted.

  According to the structure of FIG. 10, the radial force applied to the boss portion 12c is absorbed by the fitting structure of the hole portion 47 and the convex portion 48, and transmission to the movable spiral body 12a is reduced. Thus, the fitting structure of the hole 47 and the convex portion 48 functions as a force transmission reducing means.

  With reference to FIG. 11, the 8th structure of the principal part of a scroll compressor is demonstrated.

  The boss 12c of the movable scroll 12 is formed separately from the movable end plate 12b and the movable spiral body 12a. A plurality of, for example, two concave portions or holes 47 are provided on the end surface of the movable end plate 12b opposite to the movable spiral body 12a, while a plurality of, for example, two convex portions 48 are provided on the axial end surface of the boss portion 12c. The convex portions 48 are fitted into the hole portions 47 in close contact with each other.

  According to the structure of FIG. 11, the radial force applied to the boss portion 12c is absorbed by the fitting structure of the hole portion 47 and the convex portion 48, and transmission to the movable spiral body 12a is reduced. Thus, the fitting structure of the hole 47 and the convex portion 48 functions as a force transmission reducing means. In addition, the rotation of the boss portion 12 c with respect to the movable end plate 12 b is locked by the fitting structure of the plurality of hole portions 47 and the plurality of convex portions 48.

FIG. 1 is a cross-sectional view showing a part of a movable scroll used in a conventional scroll compressor. It is sectional drawing which exaggerated and showed the deformation | transformation state of the movable scroll of FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention. It is sectional drawing which shows the 1st structure of the principal part of the movable scroll used for the scroll compressor of FIG. It is sectional drawing which shows the 2nd structure of the principal part of the movable scroll used for the scroll compressor of FIG. It is sectional drawing which shows the 3rd structure of the principal part of the movable scroll used for the scroll compressor of FIG. It is sectional drawing which shows the 4th structure of the principal part of the movable scroll used for the scroll compressor of FIG. It is sectional drawing which shows the 5th structure of the principal part of the movable scroll used for the scroll compressor of FIG. It is sectional drawing which shows the 6th structure of the principal part of the movable scroll used for the scroll compressor of FIG. It is sectional drawing which shows the 7th structure of the principal part of the movable scroll used for the scroll compressor of FIG. It is sectional drawing which shows the 8th structure of the principal part of the movable scroll used for the scroll compressor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Fixed scroll 11a Fixed spiral body 11b Fixed end plate 12 Movable scroll 12a Fixed spiral body 12b Fixed end plate 12c Boss part 13 Casing 14 Front housing 15 Compression space 17 Discharge chamber 18 Discharge port 19 Self-rotation prevention mechanism 21 Eccentric bush 22 Drive Bearing 23 Shaft 24 Shaft bearing 25 Main bearing 26 Eccentric pin 27 Counterweight 29 Radial bearing 31 Rotor 32 Electromagnetic clutch 41 Constricted part 42 Constricted part 43 Constricted part 44 Tube part 45 Convex part 46 Hole part 47 Hole part 48 Convex part

Claims (8)

  A scroll compressor including a scroll member having an end plate, a spiral wound formed on one side of the end plate, and a boss formed on the other side of the end plate and into which a drive shaft is fitted. A scroll type compressor, wherein the scroll member is provided with a force transmission reducing means for reducing a radial force applied to the boss portion from being transmitted to the spiral body.   The scroll compressor according to claim 1, wherein the force transmission reducing means is a constricted portion provided on an outer periphery of the boss portion.   The scroll compressor according to claim 2, wherein the constricted portion is formed in the vicinity of the end plate.   The scroll compressor according to claim 1, wherein the force transmission reducing means is a groove provided in the end plate corresponding to the periphery of the boss portion.   The said end plate and the said boss | hub part are formed in the different body, the cylinder part was provided in the said end plate, and the said force transmission reduction means was comprised by making the said cylinder part fit into a part of said boss | hub part. Item 2. The scroll compressor according to Item 1.   The end plate and the boss part are formed separately from each other, the boss part has a small-diameter convex part protruding in the axial direction, and the end plate has a hole part fitted in the convex part. 2. The scroll compressor according to claim 1, wherein the force transmission reduction means is configured by a fitting structure of the convex portion and the hole portion.   The end plate and the boss portion are formed separately from each other, the end plate has a small-diameter convex portion protruding in the axial direction, and the boss portion has a hole portion that fits into the convex portion. 2. The scroll compressor according to claim 1, wherein the force transmission reduction means is configured by a fitting structure of the convex portion and the hole portion. The scroll compressor according to claim 6 or 7, comprising a plurality of the fitting structures.

Images