JPH07127575A - Cooling equipment for closed type rotary compressor - Google Patents

Abstract

PURPOSE:To inject the refrigerant liquid for cooling of the same amount to each cylinder in a two-cylinder type to reduce the vibration and noise of a closed type rotary compressor, and prevent a mounting metal piece to fix an injection tube for supplying the refrigerant liquid from being loosened and removed. CONSTITUTION:A mounting metal piece 32a to fix an injection tube 12 is positioned to the correct center in the direction of thickness of a mid-plate 34 to be held by two cylinders 25, 25, the inner diameter of vertical through small holes 33a, 33b for injection of the mid-plate 34 is made equal to the length to the upper and lower cylinders 25, 25, and the mounting metal piece 32a is of screw type.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a hermetic rotary compressor of a refrigerating machine used for freezing and refrigerating.

[0002]

2. Description of the Related Art FIG. 2 is a vertical sectional side view of a conventional cooling device for a one-cylinder type hermetic rotary compressor. This hermetic rotary compressor 1 is composed of an electric element 3 and a rotary compression element 4 in a hermetic container 2, a cylinder 5, a main bearing 6
In the compression chamber 8 surrounded by the auxiliary bearing 7, the gas refrigerant sucked from the suction passage 9 is compressed by the eccentric rotational movement of the roller 11 that engages with the eccentric portion 10a of the drive shaft 10 of the electric element 3, and is illustrated. It is liquefied and sent out from the discharge port that is not protected. In order to generate a large amount of heat during this period and prevent problems such as leakage due to thermal expansion, the injection tube 1
A mounting device 12a fixed to 2 by crimping or welding is press-fitted into the main bearing 6, and a cooling device 1a for ejecting a refrigerant liquid from the vertical small hole 13 to the compression chamber 8 is provided.

When the compressor becomes a built-in unit, noise and vibration become a problem. Therefore, a two-cylinder system has been introduced to reduce the vibration, but its structure is not shown, but is almost the same as that shown in FIG. 1 described later. The mounting bracket 12a is press-fitted into the mid plate sandwiched between the two cylinders at approximately the center in the thickness direction of the mid plate (Jitsuko Sho-56-4).
877).

[0004]

The rotors in the two cylinders are out of phase with each other by 180 °, and when one is in the compression process, the other is in the suction process and the cooling refrigerant liquid is jetted alternately. However, the same amount is often not ejected,
Further, since the mid plate is only sandwiched between the two cylinders and is not fixed, there is a drawback that the press-fitted mounting bracket is disengaged by vibration.

[0005]

According to the present invention, a fitting for fixing an injection tube is located at an accurate center in the thickness direction of a mid plate, and the inner diameter of a vertical through hole for jetting of the mid plate and the upper and lower cylinders are fixed. The above problems were solved by making the lengths the same and making the fluid resistance to each cylinder the same, and by mounting the mounting bracket to the mid plate by a screw method.

[0006]

Since the pressurized refrigerant liquid alternately ejected to the two cylinders has the same fluid resistance from the fitting to the ejection to each cylinder, the same amount is ejected to evenly cool each cylinder. Moreover, since the mounting bracket is screwed to the mid plate, it can be prevented from coming loose due to vibration or the like.

[0007]

1 is a vertical sectional side view of an embodiment of a hermetic rotary compressor having a cooling device according to the present invention, in which the same parts as those in FIG. 2 are designated by the same reference numerals. The hermetic rotary compressor 21 has an electric element 23 and a rotary compression element 24 in a hermetic container 22, and the cooling device 21 a includes the hermetic container 2
It is composed of a fitting 32a fixed to the injection tube 12 fixed to 2 by crimping or welding, and vertical ejection holes 33a and 33b of the mid plate 34 sandwiched between two cylinders 25 and 25. It The mounting bracket 32a is screwed into an accurate center position in the thickness direction of the mid plate 34, and the upper vertical small hole 33a and the lower vertical small hole 33 are attached.
b has the same diameter and length. Drive shaft 3 of electric element 23
The eccentric portions 30a and 30a of 0 are out of phase with each other by 180 °, and the rollers 31 and 31 engaging with each other alternately compress the gas refrigerant sucked into the compression chambers 28 and 28 of the cylinders 25 and 25. In the suction process, the pressurized refrigerant liquid from the injection tube 12 and the mounting bracket 32a is alternately passed through the small holes 33a and 33b.
The same amount is ejected into 5, 25 to perform a cooling action.

[0008]

Since the cooling device according to the present invention is constructed as described above, it has the following effects. Since the upper half and the lower half of the small through holes provided in the mid plate have the same diameter and length, the fluid resistance from the mounting bracket is the same, and the same amount of refrigerant liquid is ejected to the upper and lower cylinders, so the cylinders are even. To be effectively cooled. Further, since the mounting bracket is screwed to the mid plate, the mid plate is fixed and is prevented from loosening and coming off without causing vibration. Further, the vibration problem can be solved by adopting the two-cylinder system even for low temperatures for freezing and refrigerating.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an embodiment of a two-cylinder type hermetic rotary compressor including a cooling device according to the present invention.

FIG. 2 is a vertical sectional side view of a one-cylinder hermetic rotary compressor provided with a conventional cooling device.

[Explanation of symbols]

 12: Injection tube 21: Hermetic rotary compressor 21a: Cooling device 22: Hermetic container 23: Electric element 24: Rotary compression element 25: Cylinder 32a: Mounting bracket 33a, 33b: Vertical through hole for ejection 34: Mid plate

Claims (2)

[Claims] 1. A hermetic rotary compressor comprising an electric element in a hermetic container and a rotary compression element driven by the electric element and having two cylinders, wherein a fitting for fixing an injection tube is provided in the two cylinders. Position it at the exact center in the thickness direction of the mid plate sandwiched between
A hermetically sealed rotary compression characterized in that the jetting vertical through-holes of the mid plate have the same inner diameter and the lengths to the upper and lower cylinders so that the refrigerant liquid is jetted to the respective cylinders in the same amount. Machine cooling system. 2. The cooling device for a hermetic rotary compressor according to claim 1, wherein the fitting for fixing the injection tube is attached to the mid plate by a screw method.