JPS6258089A - Double cylinder type rotary compressor - Google Patents

Abstract

PURPOSE:To facilitate assembling of a double cylinder rotary compressor by forming a gas groove communicating between the suction path of a cylinder at one side and the suction path of the cylinder at the other side in the intermediate partition board of the double cylinder rotary compressor. CONSTITUTION:Suction path holes 3a, 9a are formed through the cylinders 3, 9 of a double cylinder rotary compressor and arranged at such positions as shifted by 180 deg.. Arched gas grooves 2b, 2c are formed in the face lapping over the sidewall of the cylinder 9 at one side of an intermediate partition board 2 arranged between said cylinders 3, 9 where the opposite end sections of said gas grooves 2b, 2c are communicated through an axial through-hole with the suction paths 3a, 9a of respective cylinders 3, 9. Consequently, suction gas can be fed to the cylinders 3, 9 by means of a single suction tube 16 resulting in facilitation of assembling.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a two-cylinder rotary compressor used in refrigerators, air conditioners, and the like.

Conventional rotary compressors have become established in the industry, and as the products to which they are applied become larger, there is a demand for two-cylinder compressors that can demonstrate greater capacity. A conventional example will be explained with reference to FIG.

A is a closed case, and the first cylinder b and the second cylinder C are each in contact with the closed case a. Junction points b' and C' between the cylinder and sealed case a must be joined by electric welding, etc., and since the above-mentioned joining is required for each cylinder b and c, precision is required in machining the outer periphery of the cylinder, and during welding Since the distortion occurs on both sides, resulting in a combined distortion, it has the disadvantage that the accuracy and processing control of each part are extremely complicated.

Further, a first suction tube d is fixed to the first cylinder b by press fitting or the like, and a second suction tube e is connected to the first suction tube d and 18 to the second cylinder C.
Since it is fixed at the position of the 00 target, it occupies a large area and has the drawback of requiring two suction tubes.

Problems to be Solved by the Invention As mentioned above, the problems are that the distortion during welding occurs on both sides and becomes a combined distortion, so the accuracy and processing control of each part is complicated and the suction tube Since two tubes are required and the mounting positions of each tube are 1800 degrees symmetrical, the occupied area is large.

Means for Solving the Problems In order to solve the above problems, the present invention covers both ends of the partition plate with cylinders and covers the outside with a bearing to form two compression chambers, and connects the suction passage to one side. A gas groove that communicates with the compression chamber and extends through the partition plate 1, and that communicates with the other compression chamber at a position 1800 degrees different from the one that communicates with this compression chamber, on the contact surface between this partition plate and the cylinder. It is.

Function The present invention can reduce the number of joining steps by half by using the above-described configuration, and can also guarantee the accuracy of cylinders and the like due to complex strain. or,
The gas sucked in from one suction tube is distributed to two cylinders through a groove, whereas conventionally two suction tubes were required, so the pipe occupies a small area and can be stored in a compact place.

EXAMPLE An example of the present invention will be described below with reference to the drawings. 1 is a closed case of a rotary compressor, and a compression element 1a is installed inside. The partition plate 2 of the compression element 1a is fitted into and fixed to the circumferential wall of the sealed case 1, and is also fixed by a welded portion 2a. Reference numeral 3 denotes a first cylinder having a cylindrical inner surface, and a crankshaft 6 which is press-fitted together with a rotary piston 4 and a rotor of an electric motor (not shown).
The eccentric portion 6a is housed therein. Reference numeral 6 denotes a main bearing, which is provided on the cloth surface of the first cylinder 3 in FIG. Further, 9 is a second cylinder, and a rotary piston 1o
The eccentric portion 12a of the second crankshaft 12, which is connected to the crankshaft 5 through the joint portion 11, is housed therein. Reference numeral 13 designates an auxiliary bearing provided on the left side of the second cylinder 9 in FIG. 16 is a suction tube whose one end is press-fitted into the bearing 13, and 9a is a suction passage hole of the second cylinder 9, which is connected to the suction side of the compression chamber 15 through the hole 9b.2b is a partition plate. 3a is a suction gas groove provided in the first cylinder 3, and is connected to the upper groove 2C that is 1800 degrees around half a circle.3a is a suction passage hole provided in the first cylinder 3;
It is connected to the suction side of the compression chamber 8 through the hole sb1.

Reference numeral 17 is an oil pump that performs all pumping operations as the crankshaft 12 rotates, and 18 is oil.

In the above configuration, in the compression chambers 8 and 15 defined on both sides of the partition plate 2, the compression action is performed alternately as the crankshafts 6 and 12 rotate. Also, the suction gas flows as shown by the arrow in the figure. A portion flows from the suction pipe 16 to the suction passage hole 9d, and a portion flows from the hole 9b to the suction side of the compression chamber 15. The remaining intake gas flows into grooves 2b and 2ci.
The liquid passes through the compression chamber 8, passes through the compression passage 3a, and flows into the compression chamber 8 from the hole 3b. In this way, compression is performed alternately in the compression chambers 8 and 15 as the crankshafts 5 and 12 rotate.

Furthermore, by simply welding and fixing one partition plate 2 to the inner wall surface of the sealed case 1, a rotary compressor with two cylinders 3 and 9 can be obtained. Distortion when installing to is reduced.

Effects of the Invention As is clear from the above explanation, the present invention fixes one partition plate to the inner wall surface of a sealed case, and provides gas passage grooves in this fixing plate, so that the suction gas drawn from one suction pipe is is distributed between two cylinders.

Further, by fixing two cylinders to the partition plate, the following effects can be obtained.

(1) Only one suction tube is required, the tube is easy to install, and it occupies a small area and is compact.

(2) Since the suction gas passage in the compression mechanism is likely to be composed of holes and grooves, all parts are not required and the cost is low.

(3) Not only is it easy to fix to the inner wall surface of the sealed case, but the distortion that occurs when the partition plate is fixed is not complicated as in the conventional case, so parts management and assembly are facilitated.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of a two-cylinder compressor showing an embodiment of the present invention, Fig. 2 is an exploded perspective view of the main parts of Fig. 1, and Fig. 3 is a main part of a conventional two-cylinder compressor. FIG. 2...Partition plate, 2b, 2c...Gas groove, 3...First cylinder, 3a...Suction passage hole, 9...・Second cylinder, 9d...
...Suction passage hole. Name of agent: Patent attorney Toshio Nakao and one other person? −
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Claims (1)

[Claims] It consists of a sealed case and a compression element provided in the sealed case, the compression element is used as a partition plate, a cylinder is arranged sandwiching the partition plate, and a compression chamber is formed by covering the opening of the cylinder. a bearing that communicates with the one compression chamber from the sealed case and extends to the partition plate, and a suction passage that is formed on the abutment surface between the partition plate and the one bearing and that connects the suction passage and the compression chamber. A two -cylinder rotary composed of a gas groove that communicates with the other compressor in a position that is 180 ° different from the directors, and a rotating piston driven in the crank axis, which is provided in each compression chamber and holding it in the bearing. compressor.