JPH0723717B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention mainly relates to a scroll compressor used in a refrigeration system together with a condenser, an expansion mechanism, an evaporator and the like.

(Prior Art) Conventionally, in this type of scroll compressor, Japanese Patent Laid-Open No. 63-1670
As disclosed in Japanese Patent Publication No. 84 and shown in FIG. 4, a compression chamber (A) formed between the wraps (B) and (C) of each scroll (F) (O) by liquid compression at the time of start-up. If an abnormally high pressure is generated at the swing link, the abnormally high pressure is released to the suction port (L) side, or the machining error of each lap (B) or (C) is absorbed to ensure a smooth sliding operation. (S) is provided so that the movable scroll (O) can freely move in the radial direction over the fixed scroll (F) over a certain range.

Therefore, the drive pin (D) is provided on the top surface (U) of the counterweight (W) provided at the upper end of the drive shaft (K), and the drive pin (D) has the lower collar portion (E). The cylinder (G) is fitted, and the swing link (S) is pivotally attached thereto in a cantilever manner so that the lower surface (Q) thereof floats above the top surface (U). The limit pin (R) projecting on the other side is inserted into the regulation hole (Z) in the form of a fictitious hole provided on the swing link (S), and the swing pin (D) is fitted around this by using the drive pin (D) as an axis. The matching movable scroll (O) can be swung over a certain angle range.

In FIG. 4, (H) is a discharge port, (X) is a frame,
(P) is a thrust bearing of the movable scroll (O).

(Problems to be Solved by the Invention) In the above configuration, when liquid compression occurs, the swing link (S) swings so as to open a gap between the laps (B) and (C). However, during normal motion, each lap (B) (C) is generated by the centrifugal force (fm) acting on the movable scroll (O) and the horizontal component (fr) of the internal pressure in the compression chamber (A).
Of the thrust bearing (P) and the wall surface of the movable scroll (O) in close contact with each other and by the axial component (fn) of the internal pressure.
The parallelism of the orbiting scroll (O) should be maintained by pressing.

However, for example, as a prominent example, in a refrigeration system in which a compressor is incorporated, in order to remove the frost attached to the evaporator, the refrigerant flow path is reversed and a high-pressure discharge gas is passed through the evaporator with frost attached to perform defrost operation. When performing, the high pressure on the discharge port (H) side drops, and
The low pressure on the suction port (L) side is also dragged by this, and when operating under conditions of low high pressure and low pressure, the internal pressure of the compression chamber (A) is Since it is small, the parallelism of the movable scroll (O) cannot be maintained.

That is, when the high pressure and the low pressure are low, the horizontal component (fr) based on the internal pressure of the compression chamber (A) becomes small, and the radial contact force between the laps (B) and (C) becomes weak, Wrap (B) as shown in FIG.
(C) becomes easier to separate, and the axial component (f
Since n) also becomes smaller, the thrust force in the thrust direction also weakens, and as shown in FIG.
Will capsize within the permissible range of the pivotal attachment gap of the swing link (S) to the drive pin (D), and will be rotated like a mortar. For this reason, problems such as the occurrence of abnormal interference sound due to separation or re-contact between the laps (B) and (C) and a decrease in reliability of the laps (B) and (C) occur.

The present invention has been made in view of the above problems, and an object thereof is to prevent a capsizing phenomenon from occurring in a movable scroll even under a high / low pressure low operating condition, thereby generating abnormal noise, etc. It is to provide a scroll type compressor capable of preventing the above problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a drive shaft (5).
Top surface (7a) of the counterweight (7) provided at the end of the
The drive pin (8) and the limit pin (9) are projected on the
The swing link (10) is pivotally attached to the drive pin (8), and a regulation hole (13) is provided in the swing link (10).
The limit pin (9) is loosely fitted to the swing link (10) so that the swing link (10) is free to swing over a certain range around the drive pin (8).
The movable scroll (4) through the fixed scroll (3)
In the scroll compressor that is rotated with respect to the swing link (10), a spring chamber (15) is formed in the swing link (10) so as to be continuous with the restriction hole (13), and in the spring chamber 15),
One end is engaged with the limit pin (9), and the other end is brought into contact with a step portion (16) provided in a continuous portion connecting the spring chamber (15) and the regulation hole (13), so that the swing link ( The lower surface of (10) is characterized in that a spring (17) for pressing (10a) against the top surface (7a) of the counterweight (7) is interposed.

Further, between the lower surface (10a) of the swing link (10) and the top surface (7a) of the counterweight (7), the respective surfaces (7a) (10a) accompanying the swing of the swing link (10). )
A sliding plate (18) which receives the sliding motion of the counterweight (7) through the sliding plate (18) and the lower surface (10a) of the swing link (10) through the sliding plate (18). It may be pressed against 7a).

(Operation) With the spring (17) provided in the spring chamber (15), the lower surface (10a) of the swing link (10) is counterweighted (7).
The swing link (10) is always urged to the top surface (7a) of the shaft directly or through the sliding plate (18).
As a result, the parallelism of the movable scroll (4) is maintained and high
The capsizing phenomenon of the orbiting scroll (4) is prevented even during operation under low pressure conditions.

(Embodiment) The scroll compressor shown in FIG. 3 includes a fixed scroll (3) having a wrap (3a) at an inner upper position of a hermetic casing (1) through a frame (2), A compression chamber (34) is formed between the wraps (3a) and (4a) by vertically arranging a movable scroll (4) having a wrap (4a) slidably contacting the wraps (3a). ) Is used to compress the intake fluid, and a motor (6) having a drive shaft (5) is arranged on the lower side of the movable scroll (4).

Further, a counterweight (7) is integrally provided on the upper end of the drive shaft (5), and the counterweight (7) is provided.
A drive pin (8) and a limit pin (9) are provided so as to protrude from the top surface (7a) of the drive shaft (7), and the drive shaft (5) is provided above the counterweight (7).
A swing link (10) for transmitting the rotational power of the above to the movable scroll (4) side is provided.

Further, the swing link (10) is formed with a receiving hole (11) for receiving the lower surface boss portion (4a) of the movable scroll (4) at substantially the center thereof, and the receiving hole (11).
A pivot hole (12) for the drive pin (8) and a restriction hole (13) having a diameter larger than that of the limit pin (9) are formed at substantially opposite positions with respect to Hole (1
A drive pin (8) is pivotally supported on 2) and a limit pin (9) is loosely fitted in the restriction hole (13).

In order to pivotally support the drive pin (8) in the pivotal hole (12), a bearing tube (14) made of synthetic resin or the like having a large collar portion (14a) on the lower end side is used. With the collar portion (14a) in contact with the top surface (7a) side of the counterweight (7), the bearing tube (14) is placed between the drive pin (8) and the pivot hole (12). The flange portion (14a) secures a predetermined gap between the top surface (7a) and the lower surface (10a) of the swing link (10).

Thus, in the above structure, as is clear from FIGS. 1 and 2, the upper end is opened to the top surface (7a) on the upper side of the restriction hole (13) in the swing link (10). A large-diameter spring chamber (15) is formed continuously, and a step (16) is provided at the boundary between the spring chamber (15) and the regulation hole (13), and the limit pin (9) A large collar-shaped receiving portion (9a) is formed on the upper end side, and a coil spring (17) is interposed between the receiving portion (9a) and the step portion (16) in the spring chamber (15). The lower surface (10a) of the swing link (10) is always elastically pressed against the top surface (7a) of the counterweight (7) by the elastic force of the spring (17). By doing so, the swing link (10)
As a result, the fixed scroll (3) of the movable scroll (4)
The capsulation phenomenon against the wraps is prevented, and the wraps (3a) (4
Generation of abnormal noise due to separation and recontact in a) is prevented.

In addition, as shown in each figure, a thin sliding plate that is in contact with the top surface (7a) and the lower surface (10a) between the counterweight (7) and the swing link (10), respectively. (18) may be interposed, and the lower surface (10a) and the top surface (7a) may be constantly held in a pressed state via the sliding plate (18).

More specifically, the sliding plate (18) is provided with an insertion hole (18a) at its central portion, as is apparent from FIG.
Further, a semicircular locking portion (18b) and a circular through hole (18c) are formed on both lateral sides of the insertion hole (18a).

Then, the insertion hole (18a) is inserted into an oil tube (5b) communicating with the oil supply passage (5a) of the drive shaft (5) protruding from the top surface (7a) of the counterweight (7). At the same time, the engaging portion (18b) is attached to the bearing tube (14).
Of the counterweight (7) for locking the through hole (18c) to the regulating hole (13) and the limit pin (9) while locking the outer peripheral part of the flange (14a) in By facing the hole (7d) and fixing the limit pin (9) from the spring chamber (15) through the restriction hole (13) and the through hole (18c) to the fixing hole (7d), The sliding plate (18) is interposed between the surfaces (7a) and (10a).

Further, it is desirable to use, for example, a steel plate such as carbon steel as the sliding plate (18). In such a case, the sliding of the sliding plate (18) is good, and the counter of the swing link (10) is It is possible to smoothly swing the weight (7).

(Effects of the Invention) As described above, in the scroll compressor of the present invention, the swing link (10) is provided with the spring chamber (15) continuous with the restriction hole (13) of the limit pin (9), In this spring chamber (15), the lower surface (10a) of the swing link (10)
The lower surface (10a) directly to the top surface (7a) by interposing a spring (17) that presses the top surface (7a) of the counterweight (7), or each surface (7a) (10a). ) Is pressed through the sliding plate (18),
Even when operating under low pressure conditions, the capsulation phenomenon of the orbiting scroll (4) can be eliminated, and the occurrence of abnormal noise and the reduction in spiral reliability can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an essential part of a scroll type compressor according to the present invention, FIG. 2 is an exploded perspective view of the same part, and FIG. 3 is a partially omitted vertical section showing the entire structure of the scroll type compressor. FIGS. 4 and 5 are sectional views showing a conventional example, and FIGS. 5 (a) and 5 (b) are views for explaining the problem. (3) …… Fixed scroll (4) …… Movable scroll (5) …… Drive shaft (7) …… Counterweight (7a) …… Top surface (8) …… Drive pin (9) …… Limit pin ( 10) …… Swing link (10a) …… Lower surface (13) …… Regulator hole (15) …… Spring chamber (16) …… Step (17) …… Spring (18) …… Sliding plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshitaka Shibamoto, 3-12 Tsukiko Shinmachi, Sakai City, Osaka Prefecture Daikin Industries, Ltd. Sakai Plant Co., Ltd. Inside the seaside factory (72) Inventor Shusaku Ueda 3-12, Chikko Shinmachi, Sakai City, Osaka Prefecture Address Daikin Industrial Co., Ltd. Sakai Plant inside the seaside factory

Claims (2)

[Claims] 1. A drive pin (8) and a limit pin (9) are projectingly provided on a top surface (7a) of a counterweight (7) provided at an end of a drive shaft (5), and the drive pin (8) is provided. ) And the swing link (10) is pivotally attached to the swing link (1).
The limit pin (9) is loosely inserted into the restriction hole (13) provided in (0), and the swing link (10) is free to swing over a certain range around the drive pin (8).
In the scroll compressor in which the movable scroll (4) is rotated with respect to the fixed scroll (3) via the swing link (10), the swing link (10) is continuous with the restriction hole (13). Let the spring chamber (15)
And a step portion that is formed in the spring chamber (15) and has one end engaged with the limit pin (9) and the other end connected to the spring chamber (15) and the restriction hole (13). A scroll type compression characterized in that a spring (17) which is in contact with (16) and presses the lower surface (10a) of the swing link (10) against the top surface (7a) of the counterweight (7) is interposed. Machine. 2. Between the lower surface (10a) of the swing link (10) and the top surface (7a) of the counterweight (7), the respective surfaces (7a) () associated with the swing of the swing link (10) ( 10a)
Through a sliding plate (18) which receives the sliding motion of the swing link (10) and the lower surface (10) of the swing link (10).
The scroll compressor according to claim 1, wherein a) is pressed against the top surface (7a) of the counterweight (7).