JPH03997A - Rotary compressor - Google Patents

Abstract

PURPOSE:To restrain heat transmission of discharge gas in the inside of a muffler part to be transmitted to a cylinder via a cover member by providing a heat insulating material between the muffler part covering the cover part and the cover part covering the cylinder. CONSTITUTION:The compressor part of a rotary compressor is at least provided with a cylinder 7 having a bore 6 therein, a cover part 9 for partitioning a compressor chamber 8 inside the cylinder while being positioned so as to close the opening of the bore 6, and a muffler part 14 fitted to the cover part 9 so as to cover a discharge hole 11 formed on the cover part 9 and communicat ed with the inside of a compressor 8. Between the muffler part 14 and the cover part 9 inside the muffler part 14, a heat insulator 17 made of synthetic resin excellent in oil and heat resistance is provide, whereby the heat transmis sion of discharge gas inside the muffler part 14 conveyed to the cylinder 7 through the cover part 9 is restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a rotary compressor used in refrigerators, showcases, etc.

(b) Conventional technology Conventionally, this type of rotary compressor was developed in U.S. Pat.
As disclosed in the publication, a rotary compressor section and an electric motor section for driving the rotary compressor section are housed in an airtight container, and the rotary compressor section is connected to a cylinder having a bore inside and a bore opening of the cylinder. an upper cover member and a lower cover member that are provided to close the compression chamber and define a compression chamber; a discharge hole formed in one cover member and communicating with the inside of the bore; and a discharge hole formed in the cylinder so as to communicate with the inside of the bore. It consists of a suction hole and a cup-shaped muffler member attached to one cover member so as to cover the discharge hole at intervals. Then, the gas that is directly sucked into the compression chamber through the suction hole and compressed in the compression chamber is discharged outside the vessel through the discharge hole, the muffler member, and the internal space of the sealed container in this order.

(C) Problems to be Solved by the Invention However, according to the above configuration, the inside of the muffler member is always filled with high-temperature gas that has just been compressed, and the cover member is also in contact with the high-temperature gas, so the cover The member becomes extremely hot, and the heat of the cover member is also transmitted to the vicinity of the suction hole of the cylinder, heating the suction gas, resulting in a loss of refrigerating ability.

The present invention has been developed in view of the above, and has a simple configuration that suppresses heat conduction of discharged gas that is transmitted to the suction hole through the cover member, and allows dense gas to be sucked into the cylinder bore. The objective is to improve the refrigerating capacity and coefficient of performance of the compressor.

(d) Means for Solving the Problems The present invention includes a cylinder provided in a closed container and having a bore therein, and a discharge hole provided to close the bore opening of the cylinder and communicate with the inside of the bore. The muffler includes a cover member and a cup-shaped muffler member that covers the discharge hole at intervals, and a heat insulating material is provided between the muffler member and the cover member in the muffler member.

(B) Function The rotary compressor of the present invention has the above-described structure, and has a partial structure in which a heat insulating material is interposed between the cover member and the muffler member, and the inside of the muffler member, which is transmitted to the cylinder via the cover member, is The heat conduction of the discharged gas can be suppressed, and the heating inside the suction hole can be suppressed, allowing gas with a density of 100 ml to be sucked into the cylinder bore, improving the refrigerating capacity and coefficient of performance of the compressor. It is something.

Kube) Example Embodiments of the present invention will be described below with reference to the drawings.

1 connects a rotary compressor section 2 and an electric motor section 3 that drives the rotary compressor section 2 through a rotating shaft 4, and connects these two machine sections 2. :3 is housed in a closed container 5. The rotary compressor section 2 includes a cylinder 7 having a bore 6 therein, and an upper cover member 9 and a lower cover member 10 that are provided to close the opening of the bore 6 of the cylinder and define a compression chamber 8 within the cylinder 7. A discharge hole 11 formed in the upper cover member 9 and communicating with the inside of the compression chamber 8; a suction hole 12 formed in the cylinder 7 so as to communicate with the inside of the compression chamber 8; a discharge valve 13 attached to the upper cover member 9; a pump-shaped muffler member 14 attached to the upper cover member 9 so as to cover the discharge hole TI at intervals;
It consists of a roller 15 that rotates eccentrically within the compression chamber 8, and a vane 16 whose tip always contacts the outer peripheral surface of the roller to divide the inside of the compression chamber 8 into a high pressure side and a low pressure side. Reference numeral 17 denotes a heat insulating material made of a synthetic resin material (such as polybutylene terephthalate) having refrigerant resistance, oil resistance, and heat resistance, which is fixed to the upper surface of the upper cover member 9 except for the valve housing recess 21. 18 is a suction pipe for refrigerant gas, and 19 is a discharge pipe.

In the compressor having such a configuration, gas directly flows into the compression chamber 8 through the suction pipe 18 and the suction hole 12 and is compressed by the roller 15, and then flows through the discharge hole 11 of the upper cover member 9.
, is discharged into the muffler member 14 via the discharge valve 13. Thereafter, it is discharged from the discharge pipe 19 to the outside through the hole 20 of the muffler member 14 and the air gap of the electric motor section 3.

In the rotary compressor configured as described above, since the upper surface of the upper cover member 9 is coated with a heat insulating material 17, the upper cover member 9 is not exposed to the high temperature discharged gas filling the muffler member 14. The soil cover member 9 can be prevented from being exposed, the heating of the soil cover member 9 can be suppressed, and the heat conduction of the discharge gas transmitted to the cylinder 7 via the soil cover member 9 can be suppressed, and the suction hole 1 can be prevented from being exposed.
It is possible to suppress the temperature rise of the cylinder 7 in the vicinity of the compressor 2, thereby allowing dense gas to be sucked into the compression chamber 8, thereby improving the refrigerating capacity and coefficient of performance of the compressor.

Further, FIGS. 4 to 6 show other embodiments, in which a rib 23 is provided on the heat insulating material 22 fixed to the upper surface of the upper cover member 9 to cover the circumferential surface of the upper cover member 9. , this rib is sandwiched between the upper cover member 9 and members 779 to 14 to improve the sealing performance of the muffler member. FIG. The heat insulating effect is further improved by fixing two heat insulating materials 24 and 25 to the upper surface of the muffler member 14. In FIG. It was formed.

(G) Effects of the Invention As described above, according to the present invention, with a simple structure in which a heat insulating material is interposed between the cover member and the muffler member, the heat in the muffler member that is transmitted to the cylinder via the cover member is Heat conduction of the discharged gas can be suppressed, heating in the suction hole can be suppressed, and dense gas can be sucked into the cylinder bore, thereby improving the refrigerating capacity and coefficient of performance of the compressor.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a rotary compressor showing an embodiment of the present invention, FIG. The sectional views and FIGS. 4 to 6 are longitudinal sectional views of main parts of the rotary compressor section showing other embodiments. 2...Rotary compressor section, 5...Airtight container, 6...Bore, 7...Cylinder, 8...Compression chamber, 9...Top cover member, 11...Discharge hole, ]2 ...Suction hole, 14...
・Muffler member, 17...insulation material.

Claims (1)

[Claims] (1) A cylinder provided in an airtight container and having a bore therein, a cover member provided with a discharge hole that is provided to close the bore opening of the cylinder and communicates with the inside of the bore, and the discharge holes are spaced apart from each other. 1. A rotary compressor comprising a cup-shaped muffler member for covering the muffler member, characterized in that a heat insulating material is provided between the muffler member and the cover member within the muffler member.