JPH0726628B2 - 2-cylinder rotary compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a two-cylinder rotary compressor used in an air conditioner, and more particularly to an improvement in a connection structure of a suction pipe thereof.

[Conventional technology]

3 and 4 are sectional views showing a two-cylinder rotary compressor disclosed in Japanese Patent Laid-Open No. 63-235686. In these figures, (1) is a closed container, and (2) is this closed container. (1)
The electric element housed in the upper part of (1) and (3) is the compression element housed in the lower part (1) of the closed container. The compression element (3) is a drive shaft (4) that transmits the driving force of the electric element (2), and a cylinder (5) provided in a vertically stacked state.
(6), the upper bearing (7) and the lower bearing (8) that close the cylinders (5) and (6) and support the drive shaft (4), and the intermediate partition narrowed between the cylinders (5) and (6) Board (9),
A rolling piston (10) fitted in the two eccentric parts of the drive shaft (4) and rotating in the cylinders (5) and (6).
(11) and so on. Further, (12) is an accumulator installed in parallel with the compressor body (1), and the upper and lower cylinders (5) of the accumulator (12) and the compression element (3).
Inside (6) means two independent suction pipes (13)
It is communicated by (14). The insertion holes of the suction pipes (13) and (14) in the closed container (1) are all burred.

Next, the operation will be described. When the drive shaft (4) is rotated by the electric element (2), the rolling pistons (10) (11) fitted to the 180 ° symmetrical eccentric part of the drive shaft (4)
By rotating in the upper and lower cylinders (5) and (6), the refrigerant gas compression process is performed in the upper and lower cylinders (5) and (6) out of phase with each other by 180 °. As a result, the refrigerant gas from the refrigeration cycle system is stored in the accumulator (1
2) and then into the upper and lower cylinders (5) and (6) in the closed container (1), respectively, independent suction pipes (13) (1)
4) guided by. By the way, FIG. 4 shows the connection structure of the suction pipes (13) and (14) to the closed container (1). The insertion holes of the suction pipes (13) and (14) in the closed container (1) have sealability and pressure resistance. Burr rig processing is applied from the viewpoint of strength, and the joint pipe (15)
(16) is inserted and welded, and suction pipes (13) (14)
Is an extension pipe (17) fixed to a cylinder (5) (6)
(18) Inserted into the above joint pipe (15)
The suction refrigerant gas is sealed to the outside and the inside of the high-pressure closed container (1) by welding the (16) and the extension pipes (17) and (18) by brazing or the like.

[Problems to be Solved by the Invention]

Since the connection structure of the suction pipe of the conventional two-cylinder rotary compressor is configured as described above, the distance between the two suction pipes becomes too close when the compressor is small, In some cases, it becomes impossible to perform the burring process on both of the insertion holes, so that there is a problem that the pressure resistance of the closed container is lowered and the sealing property due to welding in the insertion holes is weakened.

The present invention has been made in order to solve the above problems, and is a small-sized two-cylinder rotary compressor, and even when the two suction pipes are close to each other, the pressure resistance of the closed container is improved. It is an object of the present invention to provide a small two-cylinder rotary compressor that is not significantly deteriorated and has no deterioration in sealing performance due to welding of both suction pipes.

[Means for Solving the Problems]

The two-cylinder rotary compressor according to the present invention has a closed container (1) in which two suction pipes (13) and (14) for guiding the refrigerant independently of the upper and lower cylinders (5) and (6) are inserted. One of the insertion holes, that is, only the insertion hole of the suction pipe (13) communicating with the cylinder (5) side welded to the inner peripheral surface of the closed container is burred, and the other suction pipe (14).
A joint pipe (16), in which the welding length of the portion is increased by protruding from the inner peripheral surface of the closed container (1), is welded to the insertion hole of, and the outer diameter of the cylinder (6) on this side is increased accordingly. I'm making it small.

[Action]

In the case of the present invention, the pressure resistance of the closed container is given to the cylinder welded to the inner peripheral surface of the closed container, and the burring process is performed only on the insertion hole in the closed container into which the suction pipe communicating with this cylinder is inserted. Because it has been given, 2
Even if the suction pipe of the book approaches, it does not hinder the burring process, and by making the outer diameter of the other cylinder smaller, the joint pipe that is not burring process is projected from the inner peripheral surface of the closed container. Since the welding length of this portion can be increased, the sealing property at this portion is improved.

〔Example〕

 An embodiment of the present invention will be described below.

In FIGS. 1 and 2, the same parts as those in FIGS. 3 and 4 are designated by the same reference numerals, duplicate description thereof will be omitted, and different parts will be described below. That is, in FIGS. 1 and 2, the suction pipe (1) is inserted into the cylinders (5) (6) above and below the compression element (3) provided in the lower part of the closed container (1).
3) Inhalation in which (14) communicates with each other independently, and the connection between these and the closed container (1) communicates with the larger diameter cylinder (5) welded to the inner peripheral surface of the closed container (1). Pipe (13)
The burring process is applied only to the insertion hole in the closed container (1) into which is inserted, while the outer diameter of the cylinder (6) which is not welded to the inner peripheral surface of the closed container (1) is particularly large with respect to the cylinder (5). The suction pipe (14) -side joint pipe (16), which is formed small and communicates with the small-diameter cylinder (6), has a structure in which the welding length of the portion is formed as a structure protruding from the inner peripheral surface of the closed container (1). It is characterized by the fact that it takes a long time.

Next, the operation will be described. When the drive shaft (4) is rotated by the electric element (2), the rolling piston (10) is attached to the eccentric portion of the drive shaft (4) symmetrically arranged at 180 °.
As the (11) rotates in the cylinders (5) and (6), the compression process is performed in the upper and lower cylinders (5) and (6) with a phase difference of 180 °. As a result, the refrigerant gas is guided from the accumulator (12) to the upper and lower cylinders (5) and (6) in the closed container (1) by the suction pipes (13) and (14) provided independently of each other. Here, the insertion hole in the closed container (1) into which the suction pipe (13) communicating with the larger diameter cylinder (5) welded to the inner peripheral surface of the closed container (1) is inserted is burred. In addition to improving the sealing performance and pressure resistance of the closed container (1) by welding, the cylinder (6) which is not welded to the inner peripheral surface of the closed container (1) has the large diameter cylinder (5). ), The outer diameter of the cylinder (6) is reduced to provide a space between the outer peripheral surface of the cylinder (6) and the inner peripheral surface of the closed container (1), and the space is used to form the joint pipe (16). It is intended to improve the sealing property of the sealed container (1) by making it stick out from the inner peripheral surface and making the sealing length large by welding this.

In the above-mentioned embodiment, the case where the insertion hole in the closed container into which the suction pipe (13) communicating with the upper cylinder (5) side is inserted is burred is shown. ) Side, the suction pipe (14) may be provided in an insertion hole in the closed container into which the suction pipe (14) is inserted. However, in this case, it goes without saying that the outer peripheral surface of the lower cylinder (6) is welded to the inner peripheral surface of the closed container.

〔The invention's effect〕

Since the two-cylinder rotary compressor of the present invention is configured as described above, the pressure-resistant strength of the closed container is provided on the cylinder side welded to the inner peripheral surface of the closed container, and the outer diameter of the other cylinder is set to be smaller than the inner diameter of the closed container. By making it smaller, the joint pipe of this part protrudes from the inner peripheral surface of the closed container to increase the welding length, which ensures a sufficient sealability of this part, and a highly reliable small 2-cylinder rotation. A compressor of the type is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an implementation side of a two-cylinder rotary compressor of the present invention, FIG. 2 is an enlarged cross-sectional view showing a connection structure of its suction pipe, and FIG. 3 is a conventional two-cylinder rotary type. FIG. 4 is a vertical sectional view of the compressor, and FIG. 4 is an enlarged sectional view showing the connection structure of the suction pipe. In the figure, (1) is a closed container, (2) is an electric element,
(5) and (6) are cylinders, (9) is a partition plate, (12) is an accumulator, (13) and (14) are suction pipes, and (16) is a joint pipe. In other figures, the same reference numerals indicate the same parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nao Takimoto 3-18-1, Oga, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Plant (72) Inventor Kenji Suzuki 3--18-1, Oga, Shizuoka-shi No. Mitsubishi Electric Co., Ltd. Shizuoka Works (72) Inventor Shoji Hagiwara 3-18-1, Oka, Shizuoka City, Shizuoka Prefecture Mitsubishi Electric Co., Ltd. Shizuoka Works (72) Satoshi Suzuki, 3-18, Oka Shizuoka City, Shizuoka Prefecture No. 1 Mitsubishi Electric Corporation Shizuoka Factory

Claims (1)

[Claims] 1. An electric element is provided in an upper part of a hermetic container, and two cylinders, which are vertically partitioned by a partition plate, are provided in a lower part, and the inside of these cylinders and the inside of an accumulator are connected by two independent suction pipes. In the two-cylinder rotary compressor thus constructed, of the two insertion holes of the suction pipe provided in the closed container, the suction pipe that communicates with the large-diameter cylinder welded and fixed to the inner peripheral surface of the closed container. The outer diameter of the other cylinder is made smaller than the outer diameter of the cylinder, and the insertion hole of the suction pipe communicating with this cylinder is made to project beyond the inner peripheral surface of the closed container. A two-cylinder rotary compressor in which a joint pipe having a longer welding length is welded.