JPH0619835Y2 - Scroll compressor - Google Patents

Description

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

[Prior Art] Conventionally, as a revolving mechanism of a movable scroll in a scroll compressor, for example, one having a structure as shown in Japanese Patent Laid-Open No. 59-28082 is known.

In this conventional structure, as shown in FIG. 5, the recess forming plates 33 and 34 are provided on the end surface of the movable scroll 31 and the facing surface of the fixed substrate 32 in the housing facing the end surface of the movable scroll 31.
A plurality of recesses 36 and 37 are annularly arrayed and formed on the end surface of the movable scroll 31 and the facing surface of the fixed substrate 32 by circular through holes provided on both recess forming plates 33 and 34, which are fixed by 5 or the like. Intervening members 38 each having a short cylindrical shape are interposed between the facing concave portions 36.

Then, according to this revolution mechanism, the load in the thrust direction applied to the movable scroll 31 during gas compression is
The both ends of the interposition member 38 and the bottoms of the recesses 36, 37 are received by the contact, and the load in the radial direction is
The outer peripheral surface of the interposition member 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] By the way, in this type of scroll compressor, as shown in FIG. 5, a through hole 39 is provided at the center of the fixed base plate 32, and a facing surface of the movable scroll 31 is provided. A boss portion 40 that is inserted through the through hole 39 is provided in a protruding manner, and a drive portion body including an eccentric shaft 41, a bush 42 and the like is fitted into the boss portion 40 via a bearing 43. Since a large load is applied to the bearing 43 in the radial direction during gas compression, it is desired to use a bearing 43 having a diameter as large as possible to improve wear resistance.

However, in the above-mentioned conventional configuration, the large-diameter bearing 4
3 is used, the thickness of the boss portion 40 becomes thin, and the bearing 43
Since the load applied to the boss cannot be received reliably, the boss 40
May be deformed. Further, since the plurality of concave portions 37 are formed in an array on the fixed substrate 32, the fixed substrate 3
The center through hole 39 of No. 2 cannot be configured to have a large diameter so as to use the large diameter bearing 43 and to secure the boss portion 40 having a predetermined wall thickness. When the large fixed substrate 32 having the central through hole 39 is provided, there is a problem that the entire compressor becomes large.

This invention was made by paying attention to the problems existing in such a conventional technique, and the purpose thereof is to use a large-diameter bearing without increasing the size of the entire compressor. Accordingly, it is an object of the present invention to provide a scroll compressor capable of improving wear resistance and reliably preventing the boss portion of a movable scroll from being deformed.

[Means for Solving the Problem] In order to achieve the above-mentioned object, in the scroll compressor of the present invention, as a mechanism for preventing the revolution of the movable scroll and allowing the revolution thereof, the spiral portion of the movable scroll is used. A plurality of circular recesses are arranged in an annular shape on the opposite surface and the surface of the fixed substrate facing the opposite surface, and an interposition member is interposed between the opposed recesses, and the center of the fixed substrate A through hole is formed in the movable scroll, and a boss portion is formed on the back surface of the movable scroll so as to be fitted into the drive unit body through a bearing in a state of being inserted into the through hole. A plurality of reinforcing protrusions extending in the axial direction are provided between the members, and a plurality of allowance recesses for allowing the revolution movement of the reinforcing protrusions between the recesses on the fixed substrate are provided on the inner peripheral surface of the through hole. Is formed.

[Operation] In the scroll compressor configured as described above,
When the movable scroll orbits and compresses, the outer peripheral surface of the interposition member engages with the inner peripheral surface of the facing recess, whereby the movable scroll is received by the housing, and the orbit of the movable scroll is allowed. The rotation is stopped while being done.

A plurality of reinforcing ridges extending in the axial direction between the interposing members are provided on the outer periphery of the boss portion of the movable scroll, and the inner peripheral surface of the through hole of the fixed substrate has recesses on the fixed substrate. Since a plurality of permissible recesses are formed to allow the orbital movement of the reinforcing ridges between the ridges, the thickness of the boss can be reduced, so that a large diameter bearing can be used as a coupling bearing for the drive unit to the boss of the movable scroll. It is possible to use the same one, and it is possible to increase the strength of the boss portion.

[Embodiment] An embodiment of a scroll compressor embodying the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 2, the housing 1 is composed of a front housing 2 and a rear housing 3. The 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 rotatably supported by the eccentric shaft 7, and the relative amount of rotation of the balance weight 8 and the bush 9 is determined by the pin 1.
It is regulated to a predetermined amount by 0. The eccentric shaft 7, the bush 9 and the like constitute a drive unit body.

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 at the center of the fixed substrate 4 and the recess forming plate 15, and the boss portion 26 is inserted through the through hole 27. Then, as shown in FIG. 3, the scroll portions 11b and 12b of the scrolls 11 and 12, respectively.
Contact each other at at least two points, and in this state, the base end walls 11a and 12a of the scrolls 11 and 12 and the spiral portion 1
A compression chamber 14 is formed by 1b and 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 12 a of the movable scroll 12 by a plurality of pins 17, respectively. Multiple circular recesses 1
The circular holes 8 and 19 are formed in circular shapes 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. An interposing member 20 composed of a ball and a shoe is interposed between the facing concave portions 18 and 19, respectively, and both end surfaces thereof are in contact with the bottom surfaces of the facing concave portions 18 and 19, respectively.

As is apparent from FIG. 1, when the orbiting scroll 12 revolves with the rotation of the eccentric shaft 7 on the rotary shaft 5, the interposition member 20 has an opposing recess 1 on its outer peripheral surface.
Orbiting while contacting the opposite side of the inner peripheral surface of 8 and 19,
Rotation of the movable scroll 12 is prevented. The orbiting radius of the orbiting scroll 12 is twice the difference between the diameter of the facing recesses 18 and 19 and the diameter of the interposition member 20.

As shown in FIG. 1, the plurality of reinforcing ridges 26a are formed by providing arcuate recesses 26b on the outer periphery of the boss portion 26, and extend in parallel with each other between the interposition members 20 in the axial direction. . The plurality of permissible recesses 27a are formed by providing corrugated unevenness on the inner peripheral surface of the through hole 27 so as to be located between the recesses 18 on the fixed substrate 4, and the orbital movement of each reinforcing protrusion 26a. Has a space that allows

That is, as shown in FIG. 1, the radius of the protrusion 27b between the allowable recesses 27a is r1, the radius of the recess 26b between the reinforcing protrusions 26a is r2, the revolution radius of the orbiting scroll 12 is Ro, and the orbiting scroll is Projection portion 27 when revolving 12
When the required clearance between the b and the recess 26b is α, the radii r1 and r2 are set to satisfy the requirement of the following equation.

r2 = r1 + Ro + α Further, as shown in FIG. 1, the cut amount of the allowable recess 27a is L1, the protruding amount of the reinforcing protrusion 26a is L2, and the allowable recess 27a and the reinforcing protrusion 2 when the movable scroll 12 revolves.
When the required clearance with 6a is α, the cut amount L1 and the protrusion amount L2 are set so as to satisfy the requirement of the following equation.

L1 = L2 + Ro + α Therefore, each reinforcing ridge 26a has a locus of movement M shown in FIG.
Even if it is revolved around, it does not interfere with the allowable recess 27a.

The suction port 21 is provided on the outer periphery of the rear housing 3,
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 passes through a discharge passage 23 that is openably closed by a discharge valve 22. After being discharged into the discharge chamber 24, it is led out from the discharge port 25 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 interposition member 20 comes into contact with a portion on the outer peripheral surface opposite to the inner peripheral surfaces of the facing recesses 18 and 19. It orbits, the revolution of the orbiting scroll 12 is allowed, and the rotation thereof is prevented. By the revolution of the movable scroll 12, the contact portions of the scroll portions 11b, 12b of the scrolls 11, 12 are moved toward the center of the compressor for compression, and the compressed refrigerant gas is discharged from the discharge passage 23. To be done.

At this time, the both end surfaces of each interposition member 20 face the opposite recesses 18, 1
9, the load in the thrust direction acting on the movable scroll 12 is received by the fixed substrate 4 via the interposition member 20. In addition, the outer peripheral surface of each interposing member 20 is in contact with the inner peripheral surfaces of the recesses 18 and 19, whereby the radial load acting on the movable scroll 12 is fixed via the interposing member 20 to the fixed substrate 4. Be accepted by.

In this embodiment, a plurality of reinforcing ridges 26a are provided on the outer periphery of the boss portion 26 of the movable scroll 12, and the reinforcing ridges 26a are revolved on the inner peripheral surface of the through hole 27 on the fixed substrate 4 side. Multiple allowance recesses to allow movement 2
Since 7a is formed, the movable scroll 1 does not have to have a large diameter through hole 27 on the fixed substrate 4 side.
The second boss portion 26 can be reinforced, and the boss portion 26
Even if a large-diameter bearing 13 is used as the bearing 13 for connecting the drive unit body such as the bush 9, the size of the entire compressor does not increase. Therefore, a large load in the radial direction applied to the base end portion of the movable scroll 12 is applied to the large-diameter bearing 1
3, it is possible to surely receive the same, it is possible to improve the wear resistance of the same portion, and it is possible to surely prevent the boss portion 26 into which the bearing 13 is fitted from being deformed.

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

Now, in this embodiment, the reinforcing protrusion 26a and the allowance recess 27 are
The configuration of a is different from that of the above embodiment, and a plurality of substantially semi-cylindrical reinforcing projections 26a having a radius r3 are integrally formed on the outer peripheral surface of the cylindrical boss portion 26 of the movable scroll 12. In addition, the semicircular allowance recess 27a having a radius r4 is formed in the inner peripheral surface of the circular through hole 27 at the center of the fixed substrate 4 and the recess forming plate 15 by notching. Then, the turning radius Ro of the movable scroll 12
And the clearance α, r4 = r3 + Ro + α The radii r3 and r4 are set so as to satisfy the above equation.

Therefore, in this embodiment, the reinforcing ridge 26a can be made larger and the strength of the boss portion 26 can be improved as compared with the above-described embodiments.

The present invention is not limited to the configuration of each of the above-described embodiments. For example, the recesses 18 and 19 may be integrally formed on the facing surfaces of the fixed substrate 4 and the movable scroll 12, or the interposition member 20 may be spherical. It is also possible to embody the present invention by arbitrarily changing the configuration of each part without departing from the spirit of the present invention, such as by forming the above.

[Effect of the Invention] Since the present invention is configured as described above,
Without increasing the overall size of the compressor, the coupling bearing of the drive unit to the boss of the orbiting scroll can be large in diameter to reduce the wall thickness of the boss, improving wear resistance. In addition to being able to improve the strength of the boss, it is possible to reliably prevent the boss from being deformed, which is an excellent effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, which is taken along the line A- in FIG.
A sectional view taken along the line A, FIG. 2 is a sectional view showing the entire scroll type compressor, FIG. 3 is a sectional view taken along the line BB of FIG. 2, and FIG. 4 shows another embodiment of the present invention. Partial sectional view, FIG. 5 is a partial sectional view showing a conventional revolution mechanism. DESCRIPTION OF SYMBOLS 1 ... Housing, 4 ... Fixed substrate, 7 ... Eccentric shaft as a drive part body, 9 ... Bush as a drive part body, 11 ... Fixed scroll, 11b ... Spiral part, 12 ... Movable scroll, 1
2b ... Vortex part, 13 ... Bearing, 18, 19 ... Recessed part, 20 ...
Interposition member, 26 ... Boss portion, 26a ... Reinforcing ridge, 27 ...
Through hole, 27a ... Allowable recess.

Claims (1)

[Scope of utility model registration request] 1. A fixed scroll is housed and fixed in a housing, and a 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 forming the movable scroll, a plurality of circular concave portions are annularly arranged on the surface of the movable scroll opposite to the spiral portion and the surface of the fixed substrate facing the spiral portion, and an interposing member is provided between the opposed concave portions. And a through hole is formed in the center of the fixed substrate, and a boss portion is fitted on the back surface of the movable scroll so as to be fitted to the drive unit body through a bearing while being inserted into the through hole. A scroll compressor in which spiral portions that contact with each other at least at two positions are formed on opposing surfaces of the scrolls, and gas is compressed between the spiral portions by orbiting the movable scroll. A plurality of reinforcing ridges extending in the axial direction are provided on the outer periphery of the boss portion between the respective interposition members, and reinforcing ridges are formed on the inner peripheral surface of the through hole between the concave portions on the fixed substrate. Scroll type compressor having a plurality of allowable recesses for allowing the orbital movement of the compressor.