JP2848418B2 - Hermetic electric compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor used for refrigerators, air conditioners and the like.

[0002]

2. Description of the Related Art In recent years, hermetic electric compressors (hereinafter referred to as compressors) have been required to have high efficiency and low noise.

Hereinafter, an example of a conventional compressor will be described with reference to the drawings. FIG. 3 and FIG.
No. 96 discloses a compressor.

[0004] Reference numeral 1 denotes a closed container, 2 denotes a compression element elastically supported in the closed container 1, and 3 denotes an electric element disposed above the compression element.

[0005] Reference numeral 4 denotes a stator and reference numeral 5 denotes a rotor, which constitutes the electric element 3. 6 is a cylinder head having a suction chamber 7 and a discharge chamber 8, 9 is a cylinder block having a cylinder 10, 11 is a valve plate having a suction hole 12 and a discharge hole 13, 14 is a suction lead, 15 is a piston, 1
Reference numeral 6 denotes a crankshaft, and 17 denotes a connecting rod connected to the eccentric portion 18 of the crankshaft.

Reference numeral 19 denotes a synthetic resin suction muffler having a communication pipe 20 one end of which is press-fitted and fixed to the cylinder head 6. Reference numeral 21 denotes a baffle that partitions the suction muffler 19 into an expansion chamber 22 and a resonance chamber 23, and 24 denotes a baffle hole.

In the above configuration, the low-temperature and low-pressure refrigerant gas returned from the refrigeration cycle (not shown) is supplied to the suction pipe (not shown), the suction muffler 19, the suction chamber 7, and the suction hole 12 , The suction lead 14 is opened and guided to the cylinder 10.

The refrigerant gas which has been compressed in the cylinder 10 to have a high temperature and a high pressure passes through a discharge line (not shown) and a discharge pipe (not shown) and is guided to a refrigeration cycle (not shown). I have.

[0009]

However, in the above configuration, the cylinder head 6 is heated by the heat generated by the compression element 2 and the electric element 3 during operation of the compressor. The high-temperature and high-pressure refrigerant gas compressed in the cylinder 10 is guided to the discharge chamber 8 formed in the cylinder head 6.
Becomes very hot.

Therefore, the low-temperature and low-pressure refrigerant gas returned from the refrigeration cycle (not shown) is supplied to the cylinder 10
By the time, the portion of the communication pipe 20 that is pressed into the cylinder head 6 is extremely heated. For this reason,
Since the refrigerant gas having the increased specific volume flows into the cylinder 10, the volumetric efficiency of the compressor is reduced.

The suction muffler 19 is a resonance type silencer having the resonance chamber 23, but has a problem that noise contained in the sucked refrigerant gas cannot be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and aims to reduce heating of a suction refrigerant gas. It is another object of the present invention to provide a compressor that reduces the noise contained in the suction refrigerant gas and has high volumetric efficiency and low noise.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cylinder block, a cylinder head having a suction chamber and a discharge chamber attached to the cylinder block, and an upper surface formed in the cylinder head. A concave portion having an open side, and disposed on the cylinder head,
A suction muffler that closes an opening to make the recess a closed space.
From the suction muffler to the suction chamber through the recess.
And a communication pipe extending in the recess,
An insulation space was formed around the pipe .

Further, a resonance hole communicating with the heat insulating space is provided in the communication pipe.
Is provided.

[0015]

According to the present invention, since the closed space formed by the communication pipe, the concave portion and the muffler is a heat insulating layer,
Heat from the cylinder head is not easily transmitted to the communication pipe. Therefore, the heating of the suction refrigerant gas can be reduced.

Further, by providing a resonance hole in the communication pipe, a resonance chamber can be formed in the heat insulating layer, and the noise contained in the suction refrigerant gas can be reduced as a resonance type silencer.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A compressor according to an embodiment of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example will be described using the same reference numerals, and the same components and operations will be omitted. FIG. 1 is a sectional view of a main part of the embodiment.

In FIG. 1, reference numeral 25 denotes a concave portion which is opened on the upper surface side of the cylinder head 6. And the suction muffler 1
9 is a hole 2 communicating the recess 25 with the suction chamber 7
6 to the suction chamber 7. At this time, the upper surface of the recess 25 of the cylinder head 6 is closed by the suction muffler 19 to form a closed space.

In the above configuration, the low-temperature and low-pressure refrigerant gas returned from the refrigeration cycle (not shown) passes through a suction pipe (not shown), a suction muffler 19, a suction chamber 7, and a suction hole 12, and The suction lead 14 is opened and guided to the cylinder 10. The refrigerant gas that has been compressed in the cylinder 10 to have a high temperature and a high pressure passes through a discharge line (not shown) and a discharge pipe (not shown), and is guided to a refrigeration cycle (not shown).

In a compressor having such a structure,
Since there is a closed space between the communication pipe 20 and the recess 25, the heat from the cylinder head 6 at high temperature is not easily transmitted to the communication pipe 20. Therefore, the heating of the suction refrigerant gas flowing through the communication pipe 20 can be reduced, and the increase in the specific volume of the refrigerant gas flowing into the cylinder 10 can be reduced.

Another embodiment will be described with reference to FIG. 2. However, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

Reference numeral 28 denotes a hole formed in the communication pipe 20 in the recess 25, which is a resonance hole. As a result, the gas flowing through the communication pipe 20 of the suction muffler 18 enters the recess 25 through the resonance hole 28, so that the noise contained in the suction gas can be reduced, and can be used as a resonance type silencer.

[0023]

As described above, according to the present invention, a communication pipe is provided in a recess.
, A closed heat-insulating space is formed, so that an increase in the specific volume of the suctioned refrigerant gas can be reduced.

Further, by providing the communication pipe with a resonance hole communicating with the heat insulating space, noise contained in the suctioned refrigerant gas can be reduced.

Therefore, the volumetric efficiency of the hermetic electric compressor can be improved and noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a hermetic electric compressor showing one embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a hermetic electric compressor showing another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional hermetic electric compressor.

FIG. 4 is a sectional view of a main part of FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 closed container 6 cylinder head 7 suction chamber 8 discharge chamber 9 cylinder block 10 cylinder 11 valve plate 12 suction hole 13 discharge hole 19 suction muffler 20 communication pipe 25 heat insulation chamber 26 heat insulation layer 27 resonance chamber 28 resonance hole

Claims (2)

(57) [Claims] 1. A cylinder block, a cylinder head formed with a suction chamber and a discharge chamber attached to the cylinder block, a recess formed in the cylinder head and having an upper surface opened , and disposed on the cylinder head. Before
Suction muffler that closes the opening to make the recess a closed space.
From the suction muffler, through the recess, and into the suction chamber.
And a communication pipe extending to
A hermetic electric compressor , wherein a heat insulating space is formed around a pipe . 2. A resonance hole communicating with the heat insulating space is provided in the communication pipe.
2. The hermetic electric compressor according to claim 1, wherein the compressor is eccentric.