JPH0710073Y2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a scroll compressor having a fixed scroll and a movable scroll, and more particularly to a mechanism for preventing the movable scroll from rotating and allowing its revolution. Is.

[Prior Art] Conventionally, as a revolving mechanism of a movable scroll in a scroll compressor, for example, one having a structure as shown in JP-A-59-28082 is known.

In this conventional structure, as shown in FIG. 6, the back surface of the movable scroll 31 and the fixed substrate 32 in the housing facing the back surface of the movable scroll 31 are opposed to each other.
The recess forming plates 33 and 34 are fixed to the facing surface of the movable scroll 31 by a plurality of pins 35 and the like, and the circular through holes provided in the recess forming plates 33 and 34 allow the end surfaces of the movable scroll 31 and the facing surface of the fixed substrate 32 to face each other. A plurality of circular recesses 36 and 37 are arranged in an annular shape, and a short columnar roller 38 is interposed between the opposed recesses 36 and 37, respectively.

Then, according to this revolution mechanism, the load in the thrust direction applied to the movable scroll 31 at the time of gas compression is received by the contact between both end surfaces of the roller 38 and the bottom surfaces of the recesses 36, 37, and the load in the radial direction is applied. The outer peripheral surface of the roller 38 and the inner peripheral surfaces of the recesses 36 and 37 are received by the contact, and the movable scroll 31 is prevented from rotating and revolving.

[Problems to be Solved by the Invention] However, in this type of scroll compressor, the load in the radial direction at the time of compression is reduced by the outer peripheral surface of the roller 38 and the concave portion.
When it is received by contact with the inner peripheral surfaces of 36 and 37, the roller 38 receives a large bending force in the P and Q directions of FIG. 6 and tilts, and a load in the thrust direction acts on the roller 38. Therefore, the bottom edges of the recesses 36 and 37 are scratched and damaged by the outer peripheral edge of the roller 38, and the durability of the rotation preventing mechanism is reduced.

It should be noted that the roller 3 that induces the galling of the bottom surfaces of the recesses 36, 37.
When the diameter of the roller 38 is increased in order to suppress the inclination of 8, it is necessary to increase the diameter of the recesses 36 and 37. Therefore, the boss portion 40 of the movable scroll 31 is provided to enter the fixed substrate 32. The size of the through hole 39 must be reduced, and the boss portion 40 is reduced in size, so that its strength is reduced. In order to eliminate this decrease in strength, the compressor as a whole must be upsized.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and the purpose thereof is to prevent galling of a circular concave portion by a roller at the time of compression to improve durability. It is to provide a scroll type compressor that can do the above.

[Means for Solving the Problems] In order to achieve the above object, the present invention accommodates and supports a movable scroll so as to be non-rotatable and revolvable so as to face the fixed scroll, and prevent the movable scroll from rotating. As a mechanism for allowing orbital revolution, a plurality of circular concave portions are formed in an annular array on the surface of the movable scroll opposite to the spiral portion and the surface of the fixed substrate facing it, respectively,
A scroll compressor in which a roller is interposed between each of the opposed circular recesses, the end surface of the roller is in sliding contact with the bottom surface of the circular recess, and the outer peripheral surface of the roller is in contact with the inner peripheral surface of the circular recess, During operation, when a load in the radial direction is abnormally applied to the outer peripheral surface of each roller by the inner peripheral surface of the circular recess, elastic deformation allowing holes for elastically deforming the roller are provided on both end surfaces of each roller. In addition to the formation, an annular groove is formed on the outer peripheral surface of each roller.

Further, in the invention of claim 2, a gas entrance passage communicating with the elastic deformation allowing hole is formed.

[Operation] In the scroll compressor configured as described above,
When the movable scroll is revolved and gas is compressed, the outer peripheral surface of the roller comes into contact with the inner peripheral surface of the facing circular recess, and the movable scroll is received by the housing, and the revolution of the movable scroll is allowed. However, rotation is blocked. If compression occurs at this time, an abnormal load in the radial direction due to the inner peripheral surface of the circular concave portion acts on the outer peripheral portions of both ends of the roller in the opposite direction. The surface is held in surface contact with the bottom of the circular recess, which results in
It is possible to prevent galling of the bottom surface of the circular recess due to the outer peripheral edge of the roller end portion. Further, the passage introduces a gas into the elastic deformation allowance hole to improve the lubricating oil.

[Embodiment] An embodiment of a scroll compressor embodying the present invention will be described in detail below with reference to FIGS. 1 to 4.

As shown in FIG. 2, the housing 1 is composed of a front housing 2 and a rear housing 3, and these housings 2 and 3 are fixed by a plurality of through bolts (not shown) with the fixed substrate 4 sandwiched therebetween. There is. The rotary shaft 5 is rotatably accommodated in the front housing 2 via a bearing 6, and an eccentric shaft 7 is provided on the inner end surface of the large diameter portion of the rotary shaft 5 so as to project therefrom. The balance weight 8 and the bush 9 are supported by the eccentric shaft 7 so as to be rotatable relative to each other, and the relative rotation amount thereof is regulated to a predetermined amount by a pin 10.

The fixed scroll 11 is housed and fixed in the rear housing 3 and is composed of a base end wall 11a and a spiral portion 11b. The movable scroll 12 is rotatably supported in a state in which a boss portion 26 protruding at the center of the base end is fitted to the bush 9 via a bearing 13 so as to be joined to the fixed scroll 11 so as to face each other. It is composed of an end wall 12a and a spiral portion 12b. The through hole 27 is formed in the center of the fixed substrate 4 and the recess forming plate 15,
The boss portion 26 is inserted through the through hole 27. As shown in FIG. 4, the scroll portions 11b and 12b of the scrolls 11 and 12 contact each other at least at two points, and in this state, the base end walls 11a and 12a of the scrolls 11 and 12 and the scroll portion 11b,
The compression chamber 14 is formed by 12b.

The recess forming plates 15 and 16 are attached to the opposed surfaces of the fixed base plate 4 and the base end wall 12a of the movable scroll 12 by a plurality of pins 17, respectively. A plurality of circular recesses 18 and 19 are formed in circular arrays on the base end wall 12a of the movable scroll 12 and the facing surface of the fixed substrate 4 by circular through holes provided in the recess forming plates 15 and 16, respectively. There is. The roller 20 having a short cylindrical shape is interposed between the facing concave portions 18 and 19, and both end surfaces 2 thereof are provided.
0a and 20b are in contact with the bottom surfaces 18a and 19a of the facing recesses 18 and 19, respectively. The orbiting radius of this orbiting scroll 12 is
It is twice the difference between the diameter of the facing recesses 18 and 19 and the diameter of the roller 20.

As is clear from FIG. 3, when the orbiting scroll 12 revolves with the rotation of the eccentric shaft 7 on the rotary shaft 5, a plurality of rollers 20 are provided on the outer peripheral surface 20c of each of the facing recesses 18,19. The orbiting of the orbiting movable scroll 12 is prevented by orbiting while contacting the opposite side portions of the inner peripheral surfaces 18b, 19b.

When a load is applied to both end surfaces 20a, 20b of each roller 20 in the radial direction by the inner peripheral surfaces 18b, 19b of the circular recesses 18, 19 with respect to the outer peripheral surface 20c of each roller 20 during compression operation, Elastic deformation allowance hole for elastically deforming the roller 20
20d is formed, and further, an annular groove 20e for promoting elastic deformation is provided on the outer peripheral surface of each roller 20.

The suction port 21 is provided on the outer periphery of the rear housing 3, and the refrigerant gas introduced from the suction port 21 into the rear housing 3 enters the compression chamber 14 between the scrolls 11 and 12 and is compressed, and the discharge valve After being discharged into the discharge chamber 24 through the discharge passage 23 that is openably closed by 22, the discharge passage 25 leads to the external cooling circuit.

Next, the operation of the scroll type compressor configured as described above will be described.

Now, in this compressor, when the eccentric shaft 7 is eccentrically rotated along with the rotation of the rotary shaft 5, the roller 20 moves to its outer peripheral surface 20.
In c, the orbiting recesses 18 and 19 orbit while contacting with the parts on the opposite side of the inner peripheral surfaces 18b and 19b, the revolution of the movable scroll 12 is permitted, and the rotation thereof is prevented. Then, due to the revolution of the orbiting scroll 12, the scroll portion 11 of both scrolls 11 and 12 is rotated.
The contact portion of b and 12b moves to the center side of the compressor for compression, and the compressed refrigerant gas is discharged from the discharge passage 23.

At this time, both end faces 20a, 20b of each roller 20 are opposed to the recesses 18, 19
Is in contact with the bottom surfaces 18a, 19a of the
The thrust load acting on the movable scroll 12 is received by the fixed substrate 4 via the roller 20. Further, the outer peripheral surface 20c of each roller 20 is in contact with the inner peripheral surfaces 18b, 19b of the recesses 18, 19, so that the radial load acting on the movable scroll 12 via the roller 20 causes the fixed substrate 4 to move. Be accepted by.

Then, when compressing, the load in the radial direction is applied to both ends of the roller 20.
When P and Q are actuated, in this embodiment, since the elastic deformation allowing hole and the annular groove are provided as described above, the roller 20 elastically deforms, so that both end surfaces 20a and 20b of the roller 20 have circular recesses 1
It is held in a state of being in surface contact with the bottom surfaces 18a, 19a of the rollers 8, 19, and as a result, the circular recesses 18, 1 due to the outer peripheral edge of the end portion of the roller 20.
The bottom surfaces 18a, 19a of 9 are prevented from galling, and the elastic deformation is further facilitated by the annular groove. It should be noted that an abnormal load acts on the roller 20 during liquid compression, which is particularly effective at this time.

Further, since the refrigerant gas stays in the elastic deformation allowing hole 20d, the end surfaces 20a and 20b of the roller 20 and the bottom surfaces 18 of the circular recesses 18 and 19 are formed.
The lubricity of the contact surface with a and 19a is improved.

[Another embodiment] Next, another embodiment of the present invention will be described with reference to FIG.

In another example shown in FIG. 5, the elastic deformation allowance hole 20d of the roller 20 is formed in a concave shape, and a passage 20f for gas to enter is formed in the allowance hole 20d so that lubricity can be improved. .

[Effect of the Invention] Since the present invention is configured as described above,
It is possible to prevent galling of the circular concave portion by the roller at the time of compression to improve the durability and to improve the lubricity between the end surface of the roller and the bottom surface of the circular concave portion.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, and FIG.
The drawing is a cross-sectional view showing the entire scroll compressor, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG.
FIG. 5 is a sectional view taken along line B, FIG. 5 is a partial sectional view showing another embodiment of the present invention, and FIG. 6 is a partial sectional view showing a conventional revolution mechanism. 1 ... Housing, 4 ... Fixed substrate, 11 ... Fixed scroll,
11b ... Swirl section, 12 ... Movable scroll, 12b ... Swirl section, 18,1
9 ... Recessed portion, 20 ... Roller, 20a, 20b ... End surface, 20c ... Outer peripheral surface, 2
0d ... Elastic deformation allowance hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Yuji Izumi, 2-chome, Toyota-cho, Kariya city, Aichi Prefecture Toyota Industries Corp. (56) Reference JP 59-28082 (JP, A) Showa 58-186190 (JP, U) Actually opened Showa 59-142486 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A fixed scroll is housed and fixed in a housing, and the movable scroll is housed and supported so as to be non-rotatable and revolvable so as to face the fixed scroll, and the movable scroll is prevented from rotating and revolving is permitted. As a mechanism for doing so, a plurality of circular recesses are annularly arranged on the surface of the movable scroll on the side opposite to the spiral portion and the surface of the fixed substrate facing it, and rollers are respectively interposed between the opposed circular recesses. A scroll type compressor in which the end surface of the roller is slidably contacted with the bottom surface of the circular recess and the outer peripheral surface of the roller is in contact with the inner peripheral surface of the circular recess. When the load in the radial direction is abnormally applied by the inner peripheral surface of the circular recess, elastic deformation allowing holes for elastically deforming the roller are formed on both end surfaces of each roller. A scroll type compressor that is formed and has an annular groove formed on the outer peripheral surface of each roller. 2. A fixed scroll is accommodated and fixed in a housing, and the movable scroll is accommodated and supported so as to be non-rotatable and revolvable so as to face the fixed scroll, and the movable scroll is prevented from rotating and revolving is permitted. As a mechanism for doing so, a plurality of circular recesses are annularly arranged on the surface of the movable scroll on the side opposite to the spiral portion and the surface of the fixed substrate facing it, and rollers are respectively interposed between the opposed circular recesses. A scroll type compressor in which the end surface of the roller is slid on the bottom surface of the circular recess and the outer peripheral surface of the roller is in contact with the inner peripheral surface of the circular recess. On the other hand, when the load in the radial direction is abnormally applied by the inner peripheral surface of the circular recessed portion, elastic deformation allowing holes for elastically deforming the roller are formed on both end surfaces of each roller. A scroll type compressor having a gas entrance passage communicating with the elastic deformation allowing hole.