JP2590507B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll type compressor having a fixed scroll and a movable scroll, and more particularly to a mechanism that prevents the movable scroll from rotating and allows the orbit to revolve. It is.

(Prior Art) Conventionally, as a revolving mechanism of a movable scroll in a scroll compressor, Japanese Patent Laid-Open No. 57-137649 (FIG. 10)
And Japanese Patent Application Laid-Open No. 55-155916 (FIG. 11) are known.

In the configuration shown in FIG. 10, the concave forming plates 33 and 34 are fixed to the end surface of the orbiting scroll 31 and the opposing surface of the housing 32 facing the movable scroll 31 by a plurality of pins 35 and the like.
3 and 34, a plurality of recesses 3 are provided on the end surface of the movable scroll 31 and the opposing surface of the housing 32, respectively.
6, 37 are arranged in an annular shape, and a short columnar interposed member 38 is interposed between the opposed concave portions 36, 37, respectively.

In the configuration of FIG. 11, a plurality of recesses 36, 37 are formed in an annular array on the end surface of the movable scroll 31 and the facing surface of the housing 32, and an interposition member formed of a ball is provided between the facing recesses 36, 37. 39 are interposed respectively.

According to these revolving mechanisms, the thrust load applied to the orbiting scroll 31 at the time of gas compression is received by the contact between the both end surfaces of the interposition members 38 and 39 and the bottom surfaces of the concave portions 36 and 37, and also in the radial direction. Load is interposed member 38,3
The movable scroll 31 is prevented from rotating by being received by the contact between the outer peripheral surface of 9 and the inner peripheral surfaces of the concave portions 36 and 37, and is allowed to revolve.

(Problems to be Solved by the Invention) By the way, in both of the above conventional configurations, the intervening members 38, 3
Since both end faces of the recess 9 are in contact with the bottoms of the recesses 36 and 37, it is necessary to polish the bottoms of the recesses 36 and 37 to a predetermined accuracy. Forming the recesses 36, 37 directly on the opposing surfaces of 32 and polishing the bottom surfaces of the recesses 36, 37 is troublesome requiring advanced production technology, and therefore, in the example of FIG. With the end surface of the movable scroll 31 and the opposing surface of the housing 32 polished, the concave portions 36 and 37 are formed by fixing concave portion forming plates 33 and 34 having circular through holes to those surfaces. . Accordingly, in the case of such a configuration, there is a problem that separate members such as a pair of recess forming plates 33 and 34 and a plurality of pins 35 are required, so that the number of parts is increased and assembly is troublesome.

In addition, in the conventional configuration shown in FIG. 10, since the interposition member 38 is formed in a small-diameter cylindrical shape, when a tilting force is applied to the movable scroll 31 in accordance with a compression operation at a position distant from the compressor axis, the interposition member 38 is interposed. There is a problem that concentrated loads are applied to two corner portions on the diagonal line of the mounting member 38, and these portions are damaged or the orbiting of the movable scroll 31 is supported. In contrast, in the conventional configuration shown in FIG. 11, since the interposition member 39 is formed of a ball, a localized concentrated load is applied to the interposition member 39 and the bottom of the concave portion 36 when a thrust force is applied. Therefore, there is a problem that abrasion occurs quickly.

Further, in the conventional configuration, the recesses 36, 34 are located at positions where both end surfaces of the interposition member 38 are deeper than the surfaces of the recess forming plates 33, 34.
Since it is in contact with the bottom surface of 37, the mist-like lubricating oil contained in the refrigerant gas does not easily enter between the contact surfaces, resulting in poor lubrication performance.

Further, in the conventional configuration, it is possible to prevent a concentrated load at the corner portion of the interposition member 38 as described above,
In order to prevent the abrasion of the contact surface at the early stage, it is preferable to increase the area of the contact surface.
When the diameter of the compressor is increased, the diameter of the concave portion 36 is naturally increased, and the movable scroll and the like are enlarged, so that the entire compressor is enlarged. In order to avoid this increase in size, the number of the concave portions 36 and the interposition members 38 may be increased. However, in such a case, the number of components is increased and assembly becomes troublesome. Such problems of concentrated load and abrasion are remarkable when the movable scroll or the like is made of aluminum having low strength in order to reduce the weight.

(Purpose of the Invention) The present invention has been made in view of the above-mentioned problems, and has as its object to simplify the configuration and assembly at the location where the recess is formed, reduce wear at the contact location, and provide a movable scroll. An object of the present invention is to provide a scroll compressor that can be reduced in size by eliminating problems when a tilt force is applied, improving lubrication performance between contact surfaces, and the like.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a mechanism for preventing the movable scroll from rotating and allowing the orbit to revolve. A plurality of circular concave portions are respectively arranged in a ring shape on the surface of the fixing member opposed thereto, and interposing members are interposed between the opposing concave portions, respectively. A plate-like portion sandwiched between the opposing surfaces of the movable scroll and the fixed member so as to slidably contact the opposing surfaces, and projecting into the opposing recesses from the center of both sides of the plate-like portion to form the recesses. It is composed of a cylindrical shaft portion that contacts the inner peripheral surface.

(Operation) Therefore, in the scroll compressor according to the present invention, when the movable scroll is revolved and compressed, the movable scroll engages with the inner peripheral surface of the recess by the shaft portion of the interposition member. The orbiting of the orbiting scroll is restricted while revolving. That is, the shaft portion of the interposition member relatively rotates while following the revolving operation while being sandwiched between the inner peripheral surfaces of the opposing concave portions, and the plate-like portion of the interposition member has a movable scroll and a housing at the peripheral edge of the concave portion. In a state of being in surface contact with a large area, so that the load in the thrust direction can be reliably received.

(Embodiment) FIGS. 1 to 4 show an embodiment of the present invention.
This will be described in detail with reference to the drawings.

As shown in FIG. 1, the front housing 1 and the rear housing 2 are joined and fixed with an aluminum fixed substrate 3 constituting a part of the housing interposed therebetween, and are supported in the front housing 1. An eccentric shaft 4a protrudes from an eccentric position on the large-diameter inner end surface of the rotating shaft 4.
A balance weight 5 and a bush 6 are rotatably supported on the eccentric shaft 4a, and both are connected and fixed by a pin 7 so as to be able to rotate very slightly. A movable scroll 8 made of aluminum is supported on the bush 6 so as to be relatively rotatable and revolved by the eccentric rotation of the eccentric shaft 4a. As shown in FIG. 2, spiral portions 8b and 9b are formed on opposite surfaces of the wall portions 8a and 9a so as to contact at least two places. Further, a compression chamber is formed between the contact portions of the spiral portions 8b and 9b.

As is clear from FIGS. 1 and 2, a plurality of circular concave portions 10 are annularly arranged at equal intervals on the surface of the fixed substrate 3 facing the movable scroll 8. . On the surface of the wall portion 8a of the movable scroll 8 facing the fixed substrate, concave portions 11 having the same number and the same size as the concave portions 10 on the fixed substrate 3 are arranged in a ring shape. In this embodiment, as is apparent from FIG. 1, a hole having a predetermined depth is formed directly on the opposed surface of the fixed substrate 3 and the movable scroll 8 by a drill or the like, so that the recess 1 is formed.
0 and 11 are provided respectively.

An interposition member 12 is interposed between the opposing concave portions 10 and 11, respectively. As shown in FIGS. 3 and 4, each interposition member 12 has a disk portion 13 as a steel plate portion, and a steel cylindrical shaft fitted and fixed in a through hole 13a at the center thereof. And a unit 14. Both end surfaces of the disk portion 13 of the interposition member 12 are sandwiched between the opposing surfaces of the fixed substrate 3 and the movable scroll at the peripheral edges of the opposing concave portions 10 and 11 so as to slidably contact the opposing surfaces. , The shaft portion 14 of the interposition member 12 is a disk portion
13 protrudes into the opposing concave portions 10 and 11 from the center of both ends and contacts only the inner peripheral surfaces of the opposing concave portions 10 and 11. That is,
Both end surfaces of the shaft portion 14 do not contact the bottom surfaces of the concave portions 10 and 11, and a space 15 is provided between them.

With this configuration, the orbiting of the movable scroll 8 is allowed while the tip surfaces of the spiral portions 8b and 9b of the scrolls 8 and 9 are in contact with the inner surfaces of the wall portions 8a and 9a. The orbital radius of the orbiting scroll 8 is determined by the diameter of the opposing concave portions 10 and 11 and the interposition member 12.
Is twice as large as the diameter of the shaft portion 14. Also, the shaft portion 14 of the interposition member 12 is opposed to the concave portion by the revolution of the movable scroll 8.
The orbital scroll 8 rotates while being sandwiched between the inner peripheral edges of the 10, 10 and 11 to prevent the movable scroll 8 from rotating. In this embodiment, the diameter of the disk portion 13 is reduced so that the openings of the recesses 10 and 11 are covered by the disk portion 13 at any of the orbiting positions of the interposition member 12. Is set to be larger than twice the diameter of the shaft portion minus twice the diameter of the shaft portion.

As shown in FIG.
The refrigerant gas introduced from the inlet 17 of the front housing 1 into the suction chamber 18 enters the compression chamber between the scrolls 8 and 9 via the suction passage 16 and is opened and closed by the discharge valve 19. The liquid is discharged from a discharge passage 20 on the fixed scroll 9 into a discharge chamber 21 in the rear housing 2.

An annular supply passage 22 is formed between the outer periphery of the fixed substrate 3 and the inner periphery of the rear housing 2, and a supply pipe 23 extending from the discharge chamber 21 is connected to the supply passage 22. A supply hole 24 is connected between the recess 22 and each recess 10. Further, a plurality of through holes 25 are formed in the disk portion 13 of each interposition member 12. Then, the lubricating oil is supplied to each concave portion 10 on the fixed substrate 3 through the supply pipe 23, the supply passage 22 and the supply hole 24 by the discharge pressure, and also to the opposed concave portion 11 on the movable scroll 8 through the through hole 25. The lubrication is performed between the shaft portion 14 of each interposition member 12 and the opposing concave portions 10 and 11 and the like. The lubrication between the disk portion 13 of the interposition member 12 and the opposing surfaces of the fixed substrate 3 and the movable scroll 8 is performed in the form of mist contained in the suction refrigerant gas in addition to the lubricating oil supplied from the supply pipe 23. It is also performed by the entry of lubricating oil.

Now, in the scroll type compressor configured as described above, the eccentric shaft 4a is eccentrically rotated with the rotation of the rotating shaft 4, whereby the shaft portion 14 of the interposition member 12 is recessed 10, 10.
The orbiting of the movable scroll 8 is allowed by rotating the inner peripheral surface of the movable scroll 8 by contact and the rotation of the movable scroll 8 is prevented. Then, the orbital portions 8b,
The contact of 9b moves to the center side of the compressor and compression is performed,
The compressed refrigerant gas is discharged from the discharge passage 20. In this case, the disk portion 13 of each interposition member 12 is sandwiched by the peripheral surface of the opposing concave portions 10 and 11 with the opposing surface of the fixed substrate 3 and the movable scroll 8 in a wide area, and is in a state of surface contact. The load in the thrust direction acting on the scroll 8 is
Through the fixed substrate 3. At this time, the shaft
Since 14 is away from the bottom surfaces of the concave portions 10 and 11, the concave portions 10 and 11 are formed directly on the opposing surfaces of the fixed substrate 3 and the movable scroll 8 by a drill or the like without polishing the bottom surfaces of the concave portions 10 and 11. The inner peripheral surface may be finished by simple burnishing or the like. In addition, the disk portion 13 has concave portions 10,1.
Since it is not located in the area 1, the contact area can be increased by increasing the size of the fixed substrate 3 having the concave portions 10 and 11 and the movable scroll 8 irrespective of the size of the movable scroll 8. Since the contact surface between the substrate 3 and the movable scroll 8 is exposed to the gas passage, the supply of the circulating oil can be directly received from the gas.

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

First, in the embodiment shown in FIG. 5, a steel reinforcing ring 26 is fitted and fixed in the opposing concave portions 10 and 11, respectively,
The wear resistance of the contact portion of the twelve shaft portions 14 is improved. In the embodiment shown in FIG.
Steel reinforcing member integrally covering its inner peripheral surface and opening peripheral edge
27 are fitted and fixed, respectively, so that the wear resistance of the contact portion of the interposition member 12 with the disk portion 13 and the shaft portion 14 is improved.

Next, in the embodiment shown in FIG.
The shaft 13 and the shaft 14 are integrally formed, and a reinforcing ring 28 is fitted and fixed to the outer periphery of the shaft 14. In the embodiment shown in FIG. 8, reinforcing members 29 are fitted and fixed to both sides of the interposition member 12 so as to cover the side surface of the disk portion 13 and the outer periphery of the shaft portion 14. In FIG. 8, the reinforcing member 29 constituting the through-hole 25 and the holes 29a and 13b of the disk portion 13 are not shifted.
Unevenness 4 for positioning between reinforcing member 29 and disk 13
0,41 are formed.

Further, in the embodiment shown in FIG. 9, a steel movable ring 30 having a smaller diameter than the recesses 10 and 11 and a larger diameter than the shaft portion 14 of the interposition member 12 is loosely fitted in the opposed recesses 10 and 11. I have. .

The present invention is not limited to the configuration of each of the above embodiments. For example, in the embodiment shown in FIG. 1, the supply passage 22, the supply pipe 23 and the supply hole 24 are omitted, and Each of the recesses 10 is formed with a communication hole that communicates with the suction chamber 18 in the front housing 1 so that a coolant gas containing mist-like lubricating oil is supplied into each of the recesses 10. The configuration of each unit can be arbitrarily changed and embodied without departing from the spirit of the present invention, for example, by appropriately combining the embodiment of FIG.

(Effects of the Invention) As is clear from the above description, according to the present invention, the following excellent effects are exhibited.

(1) Since both ends of the interposed member do not contact the bottom surface of the opposing concave portion and the bottom surface of the concave portion does not need to be polished, the end surface of the orbiting scroll and the end surface of the movable scroll can be formed without requiring a separate member such as a concave portion forming plate. A plurality of recesses can be formed directly on the opposing surface of the housing, so that the number of parts can be reduced and manufacturing can be simplified.

(2) Since the interposition member does not contact the bottom surface of the concave portion, the concave portion can be formed deeply to reduce the weight.

(3) The disk portion of the interposed member can be made large regardless of the size of the concave portion on the fixed substrate and the movable scroll, so that the size of the whole compressor and the number of interposed members and concave portions are not increased without incurring an increase. The contact area between the mounting member, the fixed substrate, and the movable scroll can be increased, the wear of the sliding contact surface of the interposition member can be prevented, and the configuration is simplified. This low abrasion is particularly effective when the movable scroll and the fixed substrate are made of aluminum.

(4) Since the contact area can be increased by enlarging the disk portion between the fixed substrate and the movable scroll, the concentrated load applied to the disk portion when a tilting force is applied to the movable scroll during the compression operation is reduced. Thus, the tilting force applied to the interposed member is almost a force for sandwiching the interposed member, and does not damage the interposed member or hinder the revolution of the movable scroll.

(5) Since the contact surface between the disk portion of the interposition member and the orbiting scroll and the fixed substrate is exposed to the refrigerant gas passage, the mist-like lubricating oil contained in the refrigerant gas easily enters between the contact surfaces. As a result, lubrication performance can be improved.

[Brief description of the drawings]

1 is a side sectional view showing an embodiment of a scroll compressor embodying the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a partially enlarged view of FIG. FIG. 4 is an exploded perspective view, FIGS. 5 to 9 are partially enlarged sectional views showing another embodiment of the present invention, and FIGS. 10 and 11 are parts showing a conventional revolving mechanism, respectively. It is an expanded sectional view. 1 ... front housing, 2 ... rear housing, 3
... A fixed substrate constituting a part of the housing, 8... A movable scroll, 9... A fixed scroll, 8b, 9b, a spiral part, 10, 11,. Disc-shaped part, 14 ... Shaft part.

Claims (1)

(57) [Claims] 1. A fixed scroll is accommodated and fixed in a housing, and a movable scroll is accommodated and supported so as to be non-rotatable and revolvable in opposition to the fixed scroll. A scroll type compressor in which gas is compressed between the two scroll portions by the revolving motion of the orbiting scroll, wherein the orbiting scroll is a mechanism for preventing the orbiting of the orbiting scroll and allowing the orbiting. A plurality of circular concave portions are arranged in a ring shape on the surface on the opposite side to the spiral portion and the surface of the fixing member facing the spiral portion, and the interposing members are interposed between the opposing concave portions, respectively. A plate-like portion sandwiched between the opposing surfaces of the movable scroll and the fixed member at the periphery of the concave portion and slidably contacting the opposing surfaces, A scroll type compressor comprising: a cylindrical shaft portion which protrudes into both opposed concave portions from the center of both sides of the plate portion and comes into contact with the inner peripheral surface of the concave portion.