JPH0696962B2 - Scroll type fluid machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a scroll type fluid machine provided with a swing link mechanism having a built-in drive pin.

(Prior Art) Conventionally, this type of scroll type fluid machine has been disclosed in
No. 110594, and as shown in FIG. 3, a first scroll (not shown) and a second scroll (S) are supported so as to face each other, and the second scroll (S) is supported.
And a drive shaft (K) extending from the motor, a swing link (R) is provided, and the swing link (R) is provided.
The bush portion (Bu) protruding from the second scroll (S) is inserted into the boss cylinder (T) provided in the second scroll (S) via the bearing (B), while the pin provided in the bush portion (Bu) is inserted. By inserting the drive pin (P) projecting at the shaft end eccentric position of the drive shaft (K) into the hole (A), the swing link (R) can be swung around the drive pin (P). The second scroll (S) can be displaced relative to the first scroll.

(Problems to be solved by the invention) However, in the above fluid machine, particularly in the case of a small capacity type, in order to guarantee the strength of the drive pin (P), the length of the pin (P) is shortened. Therefore, it becomes impossible for the pin (P) to receive the bearing load generated when the second scroll (S) rotates, which causes a moment to occur and ) And the bearing (B) caused galling and seizure. In order to solve the problems of galling and seizure, it is conceivable to increase the diameter of the drive pin (P), but in such a case, the bush portion (Bu) and the boss cylinder (T) are also increased in diameter. In addition to the large power loss, the high pressure region formed between the bush portion (Bu) and the inside of the boss cylinder (B) also becomes large, and the second power loss becomes large. Scroll (S)
Since it causes adverse effects such as excessive pressing force against,
It cannot be adopted.

The present invention has been made in view of the above problems, and an object thereof is to provide a scroll fluid machine capable of reliably preventing galling and seizure between the drive pin and the bearing. .

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention includes a first scroll (2) and a second scroll (3) which is orbitally driven relative to the first scroll (2) and includes a drive shaft. The drive pin (62) protruding from the shaft end of (6) is made to face the inner diameter of the boss cylinder (31) protruding from the second scroll (3), and the drive pin (62)
In a scroll type fluid machine having a swing link (7) having a bush part (71) fitted to the boss cylinder (31) pivotally mounted, a large pin pedestal ( 63) is provided, and the drive pin (62) is provided on the top of the pin pedestal (63) so that the swing pedestal (63) receives the pin pedestal (63). Pedestal receiving recess (7
3) is formed.

(Operation) At the shaft end of the drive shaft (6), the swing link (7)
By providing a pin pedestal (63) to be inserted into the receiving recessed portion (73) of the device and projecting the drive pin (62) on the pedestal (63), the center of the pin (62) in the height direction is formed. The portion is located at the same position as or closer to the center portion in the bearing height direction of the second scroll (3).
Moment is not generated when the scroll (3) is rotated, and galling and seizure are reliably prevented.

(Embodiment) FIG. 2 shows a scroll type fluid machine provided with a swing link mechanism with a built-in drive pin. The first scroll (2) and the second scroll ( 3) is supported by the frame (4) so as to be opposed to each other in the vertical direction, and a motor (5) is arranged in the lower inside of the casing (1), and a drive shaft (6) extending from the motor (5). ) Is provided with a counterweight (61) at the upper end of the
A swing link (7) is arranged on the upper side of the counterweight (61), and a bush portion (71) protruding from the swing link (7) is provided at the center of the back surface of the second scroll (3). The drive shaft (6) in the weight (61) is inserted into the protruding boss cylinder (31) through the bearing (8) and is inserted into the pin hole (72) provided in the bush portion (71). The drive pin (62) protrudingly provided at the eccentric position is inserted and the second scroll (3) is relatively displaced with respect to the first scroll (2) by the swing motion of the swing link (7). This is not possible, but the adhesion between each spiral body (22) (32) is improved.

In the embodiment shown in the figure, the rotation of the scroll (3) is prevented between the frame (4) and the second scroll (3), and the scroll (3) is rotated relative to the first scroll (2). The Oldham ring (9) for orbiting is installed,
Further, although not shown, a limit pin for restricting the swing motion of the swing link (7) within a certain range is provided between the counterweight (61) of the drive shaft (6) and the swing link (7). It is intervening.

In the fluid machine described above, as shown in detail in FIG. 1, a large-diameter pin pedestal (63) is integrally provided on the upper part of the counter weight (61) provided on the drive shaft (6) to provide the pin. The drive pin (62) is projectingly provided on the top side of the pedestal (63) and is continuous with the pin hole (72) of the drive pin (62) on the lower side of the swing link (7), and A large pedestal receiving recess (7) that receives the pin pedestal (63) and allows the swinging motion of the swing link (7).
3) was formed.

The receiving recess (73) of the swing link (7)
, The pin pedestal (63) on the counterweight (61) is loosely inserted, and the drive shaft pin (6) on the pin pedestal (63) is inserted.
2) is inserted into the pin hole (72) continuous with the receiving recess (73) so that the center of the drive pin (62) in the height direction is centered in the height direction of the bearing (8). The drive pin (62) to prevent the generation of a moment when the second scroll (3) is rotated by bringing the drive pin (62) into the same position as or close to the portion.
It is possible to reliably prevent galling and seizure between the bearing and the bearing (8).

Incidentally, FIG. 2 shows a high-pressure dome type scroll type fluid machine, in which a suction pipe (11) is opened in a suction port (10) provided on the outer peripheral side of both scrolls (2) and (3), The first discharge pipe (12) extending from the upper space of the first scroll (2) in the casing (1) to the lower space of the motor (5) is connected, while the frame (4) in the casing (1) is connected. The second discharge pipe (13) is connected to the space between the motor and the motor (5), and the compressed gas discharged from the discharge hole (14) provided in the first scroll (2) is transferred to the first discharge pipe ( It is guided to the lower space of the motor (5) via 12) and discharged from the second discharge pipe (13) while cooling the motor (5).

(Effect of the Invention) As described above, in the scroll type fluid machine of the present invention, the large diameter pin pedestal (63) is provided on the protruding base of the drive pin (62) provided at the shaft end of the drive shaft (6). Then, the drive pin (62) is projected on the top of the pin base (63),
Since the pedestal receiving recess (73) is formed on the side of the swing link (7) for receiving the pin pedestal (63) and allowing the swinging motion of the swing link (7), rotation of the second scroll (3) Occurrence of galling and seizure between the pin (62) and the second scroll bearing can be prevented without generating moment.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a scroll type fluid machine according to the present invention, FIG. 2 is a vertical sectional view showing an entire structure of the scroll type fluid machine, and FIG. 3 is a sectional view showing a conventional example. (2) …… First scroll (3) …… Second scroll (31) …… Boss cylinder (6) …… Drive shaft (62) …… Drive pin (63) …… Pin base (7) …… Swing Link (71) …… Bushing (73) …… Reception recess

Claims (1)

[Claims] 1. A drive pin (62) provided with a first scroll (2) and a second scroll (3) which is orbitally driven relative to the first scroll (2), the drive pin (62) projecting from the end of the drive shaft (6). The second
A swing link (7) having a bush portion (71) fitted to the boss cylinder (31) in the inner diameter of a boss cylinder (31) protruding from the scroll (3) and fitted to the drive pin (62). ), A large diameter pin pedestal (63) is provided on the protruding base of the drive pin (62), and the drive pin (62) is mounted on the top of the pin pedestal (63). A scroll characterized in that the scroll link (7) is protruded, and a pedestal receiving recess (73) is formed in the swing link (7) to receive the pin pedestal (63) and allow the swing motion of the swing link (7). Fluid machine.