JP2851679B2 - Hermetic electric compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hermetic electric compressor used for a refrigerator, an air conditioner and the like.

2. Description of the Related Art In recent years, hermetic electric compressors (hereinafter referred to as compressors) are required to have high energy efficiency. In general, a suction muffler of a direct suction type having a low thermal conductivity such as synthetic resin is suitable. Already known.

An example of the above-described conventional compressor (Japanese Patent Laid-Open No. 58-160570) will be described below with reference to the drawings.

FIG. 5 and FIG. 6 show a conventional compressor. 50
Is a closed container, 51 is a compression element elastically supported in the closed container 50, and 52 is an electric element disposed above the compression element 51. 53 is a suction muffler, 54 is a cylinder head, 55 is a communication pipe having a threaded portion, 56 is a spring washer, and the suction muffler 53 is fixed by press-fitting the communication pipe 56 into the cylinder head 54 via a spring washer 56. ing. 57 is an insertion tube inserted into the suction muffler 53. 58 is a valve plate, 59 is a suction hole provided in the valve plate 58, and 60 is a cylinder. 61 is a lubricating oil, 62 is an oil capillary that supplies the lubricating oil 61 into the cylinder head 54 and is a cylinder head 54
Press-fit.

The operation of the compressor configured as described above will be described below.

First, refrigerant gas is sucked into the suction muffler 53 from the external cooling circuit (not shown) through the insertion pipe 57 into the compression element 51 driven by the electric element 52. This refrigerant gas is
After being guided into the cylinder head 54 through 55, it is guided to the cylinder 60 through the suction hole 59.

However, in the above configuration, the cylinder head
The communication pipe 55 is press-fitted into the pipe 54, but since the communication pipe is structurally metallic, heat transfer is good, and the refrigerant gas sucked through the communication pipe is heated by the high-temperature cylinder head to expand, and the volume thereof is increased. It was difficult to improve the efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a compressor in which workability is improved and a communication pipe is made of a material having a low thermal conductivity such as a synthetic resin.

Means for Solving the Problems In order to solve the above problems, a compressor of the present invention is provided with a compression element and an electric element elastically supported in a closed container, and an upper surface attached to the compression element. A metal cylinder head having an insertion hole formed therein, a suction chamber formed in the cylinder head communicating with the insertion hole, a discharge chamber formed adjacent to the suction chamber, and a combination provided in the suction chamber. A cap formed with a hole facing the suction hole of a compression element formed of a material having low thermal conductivity such as resin, and a notch provided on the upper surface, and a tip penetrating through the notch of the insertion hole and the cap. A suction muffler formed of a material having a low thermal conductivity such as a synthetic resin having a communication pipe having an opening at a portion thereof. The cylinder head is sandwiched between the communication pipe and a mounting leg formed integrally with the communication pipe. Together with The mounting leg is screwed to the cylinder head.

According to the present invention, the communication tube of the suction muffler formed of a material having a low thermal conductivity such as a synthetic resin is inserted into the insertion hole of the cylinder head, and the suction hole and the periphery of the suction chamber of the cylinder head are formed. Is provided with a cap having low thermal conductivity, so that the suction gas is guided to the suction hole without being heated by the metal cylinder head.

Embodiment Hereinafter, a compressor according to an embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is a closed container, 2 is an electric element, 3 is a compression element, and 4 is a metal cylinder head which constitutes a part of the compression element 3. 4a is an insertion hole formed on the upper surface side of the cylinder head 4. 4b is a suction chamber formed in the cylinder head 4. This suction chamber
A discharge chamber 4c is formed adjacent to 4b. Numeral 5 denotes a valve plate constituting the compression element 3, which has a suction hole 5a and a discharge hole (not shown).

Numeral 6 denotes a cylinder constituting the compression element 3 to which the valve plate 5 and the cylinder head 4 are attached with screws N. 7
Is an insertion tube attached to the suction tube via a spring 8. Reference numeral 9 denotes a suction muffler made of synthetic resin (for example, polybutylene terephthalate). Upper and lower suction muffler 9
It is composed of two parts, chambers 9a and 9b, into which the insertion tube 7 is inserted. A communication pipe 10 is formed integrally with a lower portion 9b of the suction muffler 9. Reference numeral 10a denotes a mounting leg formed integrally with the communication pipe 10, and the suction muffler 9 is attached to the cylinder head 4.
Is fixed. Reference numeral 11 denotes a cap, which is arranged in the suction chamber 4b. In the arrangement of the cap 11, a wall 11a comes to the valve plate 5 side and a hole 11b is formed at a position opposing the suction hole 5a of the valve plate 5. Also,
A notch 11c is formed on the upper surface of the cap 11. The communication pipe 10 of the suction muffler 9 has an insertion hole for the cylinder head 4.
4a and a part thereof is located in the cap 11 through the notch 11c. An opening 10b is formed on the side of the hole 11b of the communication pipe 10 located in the cap.

Reference numeral 10c denotes a small hole provided in the communication pipe 10, which penetrates into the communication pipe 10. 12 is a lubricating oil, 13 is an oil capillary, one end of the oil capillary is inserted into the small hole 10c and the other end is lubricating oil 12
Is immersed in.

In the above configuration, a cooling device (not shown)
The returned refrigerant gas is led to the suction muffler 9 through the insertion pipe 7, and the communication pipe 10, the opening 10 b, the cap 11 b, and the suction
Although the refrigerant gas is sucked into the cylinder 6 through a, the refrigerant gas flows while being in contact with the wall of the synthetic resin, so that the refrigerant gas is hardly affected by heat from the cylinder head 4, and the refrigerant gas is hardly heated, so that the volume efficiency can be improved. Further, since the cylinder head 4 is mounted so as to be sandwiched between the mounting leg 10a and the communication pipe 10, the suction muffler 9 does not rotate, so that the suction muffler 9 can be easily fixed.

As described above, according to the present invention, since the communication pipe is inserted into the insertion hole of the cylinder head, and the cylinder head is fixed with the mounting leg therebetween, it is prevented from rotating when the suction muffler is fixed. Is improved. Further, since the communication pipe and the cap of the refrigerant gas are formed of a material having low thermal conductivity such as a synthetic resin, heating of the refrigerant gas can be suppressed, and volume efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a compressor according to an embodiment of the present invention, FIG. 2 is a perspective view of a cap of FIG. 1, FIG. 3 is a perspective view of a communication pipe of FIG. FIG. 1 is a cross-sectional view of the electric compressor shown in FIG. 1; FIG.
The figure is a cross-sectional view of a main part along line EE in FIG. 1 ... closed container, 2 ... electric element, 3 ... compression element, 4
…… Cylinder head, 4a …… Insertion hole, 4b …… Suction chamber, 4c
…… Discharge chamber, 5a …… Suction hole, 9 …… Suction muffler, 10 ……
Communication pipe, 10a: Mounting leg, 10b: Opening, 11: Cap, 11b: Hole, 11c: Notch.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiro Yamada 3-22 Takaidahondori, Higashiosaka City, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. (72) Ichiro Kita 3-22 Takaidahondori, Higashi Osaka City, Osaka Prefecture Matsushita Refrigeration Machinery Co., Ltd. (72) Shuichi Yakushi, Inventor 3-22 Takaida Hondori, Higashi-Osaka City, Osaka Matsushita Refrigeration Machinery Co., Ltd. (56) References JP-A-64-60782 (JP, A) JP-A 55-121986 (JP, U) JP-A 50-120007 (JP, U) JP-A 50-140003 (JP, A) U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F04B 39/00 101

Claims (1)

(57) [Claims] 1. A metal cylinder head having a compression element and an electric element elastically supported in an airtight container and having an insertion hole on an upper surface attached to the compression element, and communicating with the insertion hole. A suction chamber formed in the cylinder head, a discharge chamber formed adjacent to the suction chamber, and a suction hole for a compression element formed of a material having a low thermal conductivity such as synthetic resin provided in the suction chamber. Form a hole on the side opposite to
A cap provided with a cutout on the upper surface, a suction muffler formed of a material having a low thermal conductivity such as a synthetic resin having a communication pipe that penetrates the insertion hole and the cutout of the cap and has an open end portion, A hermetic electric compressor in which a cylinder head is sandwiched between the communication pipe and mounting legs integrally formed with the communication pipe, and the mounting legs are screwed to the cylinder head.