JP2879045B2 - Compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor for compressing a fluid such as a refrigerant gas in a refrigeration cycle, and more particularly to a helical blade type compressor.

[0002]

2. Description of the Related Art As one type of hermetic compressor, a helical blade type is known. A helical blade type compressor is basically composed of a cylinder, a piston having a spiral groove eccentrically arranged inside the cylinder and having a gradually changing pitch on the peripheral surface, and a piston having a spiral groove. It is mainly constituted by the inserted blade and means for rotating the piston relative to the cylinder (rotational movement).

An operating chamber for compressing the fluid to be compressed is formed between the cylinder and the piston, and the operating chamber is partitioned by a blade into a plurality of sealed spaces whose volume gradually changes along the longitudinal direction. . Both ends of the cylinder and the piston are rotatably supported by the main bearing and the sub bearing. Further, a discharge port communicating with the operation chamber is formed in the auxiliary bearing.

[0004] When the cylinder and the piston are relatively swirled by a motor as a power source, the fluid to be compressed sucked into the operation chamber is gradually compressed by sequentially moving to a closed space having a small volume. Discharge through the discharge port.

In a compressor having such a structure, a blade that partitions an operating chamber into a plurality of hermetically sealed spaces that gradually change in the longitudinal direction is provided with a blade formed therein and a pressure at the boundary between the blade and the blade. A torsional force acts under the influence of the difference. In particular, a large twisting force acts on a portion having a large pitch.

In the conventional compressor, when the above-mentioned large torsional force is applied to the blade, a portion of one side of the blade comes into contact with one inner side of a groove provided in the piston, and the blade has a small diameter. A phenomenon occurs in which a part of the other side surface comes into contact with the other inner side surface of the groove provided in the piston. However, there is a problem in that the fluid leakage increases and the compression efficiency decreases.

[0007]

As described above, in the conventional helical blade type compressor, the inner surface of the spiral groove provided on the peripheral surface of the piston due to the torsion generated in the blade, the blade, There is a problem that the gap between the adjacent working chambers increases, the fluid leakage between adjacent working chambers increases, and the compression efficiency decreases.

Accordingly, the present invention suppresses an increase in the gap between the inner surface of the spiral groove provided on the peripheral surface of the piston and the blade due to the torsion even if the blade is twisted. It is an object of the present invention to provide a helical blade type compressor that can achieve high compression efficiency.

[0009]

In order to achieve the above object, a compressor according to the present invention compresses a fluid to be compressed between a cylinder and an eccentrically arranged inside the cylinder. A piston having a spiral groove on the peripheral surface thereof, a means for rotating the piston relative to the cylinder, and a piston which is in close contact with the inner peripheral surface of the cylinder. A blade inserted into the groove of the piston to partition the operation chamber into a plurality of sealed spaces that gradually change along the longitudinal direction, wherein the blade has a laminated structure in which a plurality of plate materials are laminated, and the plate materials are connected to each other. Are slidable in the radial direction with respect to each other.

When a torsional force acts on the blade during the compression operation, the plates constituting the blade slide in the radial direction with each other, and as a result, the thickness of the blade in the radial direction substantially increases. Both surfaces of the blade can be brought into contact with both inner surfaces of the spiral groove provided on the peripheral surface of the piston. For this reason, it is possible to suppress an increase in the gap between the blade and the inner surface of the spiral groove provided on the peripheral surface of the piston.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a compressor according to an embodiment of the present invention. As shown in the figure,
A motor unit 11 including a stator 12 fixed to an inner wall surface of the case 10 and a rotor 13 disposed inside the stator 12 and a compression unit 14 driven by the motor unit 11 are provided in the closed case 10. Have been.

The compression portion 14 includes a cylinder 15, a piston 16 eccentrically arranged in the cylinder 15, and a pair of bearings 17 installed facing the inner wall surface of the case 10.
a and 17b (hereafter, 17a is referred to as a main bearing and 17b is referred to as a sub-bearing).

The main bearing 17a and the sub bearing 17b have a cylindrical portion, and both ends of the cylinder 15 are rotatably fitted to the outer peripheral surface of the cylindrical portion. An intermediate portion of the cylinder 15 is fixed to the rotor 13. Both ends of the piston 16 are rotatably fitted inside the cylindrical portions of the bearings 17a and 17b. In this case, the rotation center axis L ₁ of the cylinder 15, the rotation center axis L ₂ of the piston 16 is displaced by a predetermined amount.

The space between the cylinder 15 and the piston 16 is an operation chamber 23 for compressing the fluid to be compressed. FIG. 2 is a perspective view of an Oldham mechanism for relatively rotating the cylinder 15 and the piston 16 without rotating the piston 16. As can be seen from this figure, an auxiliary cylinder 18 is provided between the outer peripheral surface of the cylindrical portion of the piston 16 on the side of the main bearing 17a and the inner peripheral surface of the cylinder 15.
Is press-fitted. Further, a partition plate 19 whose axial position is regulated by the auxiliary cylinder 18 and a step (different diameter step) formed on the inner surface of the cylinder 15 is pressed into the cylinder 15. This partition plate 19 has the first rectangular hole 1.
9a, and has a step at the periphery of the first rectangular hole 19a. A rectangular Oldham ring 20 is slidably fitted in a first direction x in a plane parallel to the partition plate 19 in a first rectangular hole 19 a provided in the partition plate 19. This Oldham ring 20 has a second rectangular hole 20a.
have. Then, at a position facing the Oldham ring 20 of the piston 16, a second direction y in a plane parallel to the partition plate 19 and perpendicular to the first direction x is fitted in the second rectangular hole 20 a. A slidable prism portion 16a is formed.

With such a mechanism, after the rotation of the rotor 13 is transmitted to the cylinder 15, it is further transmitted to the piston 16 via the partition plate 19 and the Oldham ring 20. In this case, the Oldham ring 20 reciprocates in the first direction x with respect to the partition plate 19, and the piston 16 moves in the second direction y perpendicular to the direction of the reciprocation of the Oldham ring 20 with respect to the Oldham ring 20. Reciprocate. Therefore,
The piston 16 rotates relative to the inner surface of the cylinder 15 without rotating. In this case, since the piston 16 does not rotate, the cylinder 15 and the piston 16
The rotation speeds are the same.

A helical groove 21 whose pitch gradually decreases from one end on the main bearing 17a side toward the auxiliary bearing 17b side is formed on the outer peripheral surface of the piston 16. The blade 22 is inserted into the groove 21. Blade 22
The outer peripheral edge is in close contact with the inner surface of the cylinder 15 and rolls, and while sliding with the piston 16, follows the swirling motion of the piston 16 and slides in the groove 21 so that it can move in and out vertically. In this example, as shown in FIG. 3, the blade 22 has a laminated structure in which a plurality of plate members 30 are laminated in the longitudinal direction of the piston 16, and the plate members 30 are configured to be slidable with each other in the radial direction.

The main bearing 17a is formed with a hollow portion 24 communicating with one end of the operation chamber 23, and a suction pipe 25 is connected to the hollow portion 24. On the other hand, cylinder 15
A discharge port 26 communicating with the other end of the operation chamber 23 is formed at a position closer to the auxiliary bearing 17b side. That is, the other end of the operation chamber 23 communicates with the inside of the sealed case 10 through the discharge port 26. A discharge pipe 27 is connected to the closed case 10.

In the above configuration, when the cylinder 15 is rotated by the motor section 11, the piston 16 makes a revolving motion by the action of the Oldham mechanism. For this reason, the fluid to be compressed introduced into the working chamber 23 from the suction pipe 25 through the hollow portion 24 is gradually compressed by the blades 22 while moving through a plurality of closed spaces whose volume gradually decreases, and finally The liquid is discharged from the discharge pipe 27 from the discharge port 26 through the closed case 10.

By the way, when such a compressing operation is performed, a large torsional force acts on a portion of the blade 22 having a particularly large pitch. However, in this example, since the blade 22 has a laminated structure in which a plurality of the plate members 30 are laminated, and the plate members are configured to be slidable in the radial direction with respect to each other, a large torsional force acts on a large pitch portion of the blade 22. Then, the plate members slide with each other in the radial direction. As a result, the thickness of the blade 22 in the radial direction is substantially increased, and this increase allows both surfaces of the blade 22 to contact both inner surfaces of the spiral groove 21. For this reason, the spiral groove 2 provided on the peripheral surface of the piston 16
It is possible to suppress an increase in the gap between the inner side surface of the blade 1 and the blade 22 and increase the compression efficiency.

[0020]

As described above, according to the present invention, a helical blade has a laminated structure in which a plurality of plate members are laminated.
In addition, the plate members are configured to be slidable in the radial direction with respect to each other. For this reason, when a large torsional force acts on the blade, the plate members slide with each other in the radial direction,
This substantially increases the radial thickness of the blade, which allows both surfaces of the blade to contact the inner surfaces of the helical groove provided on the outer surface of the piston. For this reason, it is possible to suppress an increase in the gap between the inner surface of the spiral groove provided on the peripheral surface of the piston and the blade, and to increase the compression efficiency.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a compressor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an Oldham mechanism incorporated in the compressor.

FIG. 3 is a side view of a blade incorporated in the compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Sealed case 11 ... Motor part 14 ... Compression part 15 ... Cylinder 16 ... Piston 17a ... Main bearing 17b ... Secondary bearing 20 ... Oldham ring 21 ... Groove 22 ... Blade 23 ... Operating chamber 25 ... Suction pipe 26 ... Discharge port 27 ... Discharge pipe 30 ... plate material

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hitoshi Hattori 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Home Appliances Research Laboratory, Yokohama Plant, Toshiba Corporation (72) Naoya Futakudo Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa No. 8 Toshiba Yokohama Works Home Appliances Research Laboratory (72) Inventor Masayuki Okuda 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Yokohama Works Home Appliances Research Laboratory (56) References Shokai Sho 61 -51401 (JP, U) U.S. Pat. No. 2,527,536 (US, A) U.S. Pat. No. 2,401,189 (US, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 18/30-18/352 F04C 23 / 00-29/10

Claims (1)

(57) [Claims] A piston having an eccentrically disposed inside of the cylinder, an operating chamber for compressing a fluid to be compressed formed between the cylinder and the cylinder, and having a spiral groove on a peripheral surface thereof. Means for rotating the piston relative to the cylinder; and inserting the piston into the groove of the piston so as to be in close contact with the inner peripheral surface of the cylinder to gradually move the operation chamber along the longitudinal direction. A blade that partitions into a plurality of changing enclosed spaces, wherein the blade has a laminated structure in which a plurality of plate members are laminated, and the plate members are configured to be slidable in the radial direction with respect to each other. .