JPH109171A - Hermetic compressor - Google Patents

Abstract

(57) Abstract: In a hermetic compressor using R410A as an alternative refrigerant and using refrigerating machine oil compatible with the refrigerant, it is necessary to reduce the cylinder volume by 30%. SOLUTION: In a compressor, the eccentric portions of two shafts are set in the same direction to lower the cylinder height, and the suction hole is set to 1
Shift by 80 degrees.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic compressor incorporated in a refrigeration cycle of an air conditioner or the like,
In particular, the present invention relates to a structure of a case of a closed container of a two-cylinder type compressor.

[0002]

2. Description of the Related Art A refrigerating cycle such as an air conditioner for cooling and heating the inside of a room incorporates a compressor, which is a hermetic compressor, which uses a CFC such as R12.
Compress refrigerant and refrigerant such as HCFC refrigeration such as R22,
The compressed refrigerant is discharged to a refrigerant pipe of a refrigeration cycle.

[0003] Conventional hermetic compressors are roughly classified into reciprocating type and rotary type compressors. Each compressor accommodates a compression machine driven via a rotating shaft by an electric motor in a closed case.

[0004] A two-cylinder rotary compressor of this kind which has been proposed and is similar to that disclosed in Japanese Patent Publication No. 63-38691 is configured as shown in FIG.

[0005] A conventional rotary compressor is configured as shown in FIG. 3, and a motor unit and a compression machine unit 3 are housed in a closed container 1. The motor unit is arranged at the upper part of the closed casing 1, and the compression machine part 3 is arranged at the lower part. The motor unit is composed of an electric motor including a stator 2-1 press-fitted into the closed casing 1 and a rotor 2-2 having a rotating shaft 4 mounted thereon. The output from the motor unit is transmitted through the rotating shaft 4 to a compression machine. The information is transmitted to the unit 3. The rotating shaft 4 is rotatably supported by a main bearing 5 and a sub bearing 6.

On the other hand, the compression machine section 3 comprises two cylinders 7,
The pistons 9 and 10 are accommodated in a compression chamber formed by the cylinders 7 and 8. Each piston 9, 10
Is mounted on the crank part of the rotary shaft 4 so as to be eccentrically rotatable, and the compression action of the refrigerant is performed by the eccentric rotation of the pistons 9 and 10.

The compression chamber of the compression machine section 3 and the closed vessel 1
The accumulator 11 provided on the outside of the
The refrigerant flows from the accumulator 11 through the suction pipes 12 and 13 to the compression chamber.

[0008]

However, in a rotary compressor having a two-cylinder structure, the accumulator 1
The two suction pipes 12 and 13 that guide the gas refrigerant from 1 to the cylinder chamber of the rotary type compression machine 3 are extended, and each of the suction pipes 12 and 13 is provided with a guide pipe 14 in a mounting hole of the thin closed container 1. Can be mounted airtight. Inhalation tube 1
The pitch between the two mounting holes for mounting 2, 13 is determined by the dimensions of the compression machine part 3. In any case, since the hole pitch is small, the thin-walled closed vessel 1 is placed between the mounting holes. There is a problem that the pressure resistance of the container is reduced.

On the other hand, recently, various compressor refrigerants have been studied in place of the R12 and R22 refrigerants, and various types of refrigerants have been developed. Among them, there is a new refrigerant with excellent refrigerant characteristics, but a higher saturation pressure than the existing refrigerant,
If this new refrigerant is to be adopted, a problem is that the pressure-resistant refrigerant in the container near the mounting hole of the closed container 1 decreases.

Particularly, in a high-pressure type compressor using a new refrigerant having a high saturation pressure in place of the existing refrigerant, it is required to improve the pressure resistance of the closed container 1. The conventional closed container 1 has a problem that the safety factor against the container pressure resistance and the fatigue strength cannot be sufficiently secured.

The present invention has been made in consideration of the above circumstances, and has as its object to provide a highly reliable compressor that improves the pressure resistance of a closed container and is compatible with a refrigerant having a high saturation pressure. I do.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a compressor according to the present invention uses HFC as a refrigerant.
32 or an HFC125 mixed refrigerant, and two compressor elements having substantially equal suction volumes driven by a drive element having an electric motor in a closed vessel are axially disposed through a partition plate, and the two compressors are provided. The element is a cylinder, a shaft having an eccentric portion, and rotatably provided on the eccentric portion,
A piston that eccentrically rotates with the eccentric portion of the shaft in the cylinder, a vane slidably inserted into the cylinder and separates a compression chamber and a suction chamber, an elastic body that presses the vane against the piston, And a discharge hole for discharging the compressed refrigerant, and further, at both axial ends of each of the compressor elements, an end plate having a bearing for the shaft, and both end plates. A two-cylinder rolling piston rotary compressor is provided by providing a fastening portion for connecting the compression elements, and the two eccentric parts of the shaft are set to the same eccentric direction, and the directions of the suction holes of the cylinders of the two compression elements are substantially the same. The structure is shifted by 180 degrees.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The compressor according to the first and second aspects of the present invention uses a mixed refrigerant of HFC32 or HFC125 as a refrigerant, and has two compressors having substantially equal suction volumes driven by a drive element having an electric motor in a closed container. The compressor elements are arranged in the axial direction via a partition plate, and the two compressor elements are provided rotatably on the cylinder, the shaft having the eccentric portion, and the eccentric portion, and the inside of the cylinder is A piston that rotates eccentrically with the eccentric portion of the shaft, a vane that is slidably inserted into the cylinder, and that partitions the compression chamber and the suction chamber;
An elastic body for pressing the vane against the piston, a suction hole for introducing a compressed refrigerant, and a discharge hole for discharging the compressed refrigerant, and further, the bearings are provided at both axial ends of each of the compressor elements. A two-cylinder rolling piston type rotary compressor is provided by providing an end plate having an end plate, and a fastening portion connecting the both end plates and the compression element. 2. The two-cylinder rotary compressor according to claim 1, wherein the two cylinders have the same eccentricity and the same outer diameter. Due to the structure of the rotary compressor, it is possible to improve the pressure resistance of the container near the suction pipe where the pressure resistance of the container may be reduced, and it is possible to obtain a closed container structure that can withstand the use of a refrigerant having a high saturation pressure. To improve reliability It can be.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the compressor according to the present invention will be described below with reference to the attached materials.

FIG. 1 shows a rotary compressor having a two-cylinder structure to which the present invention is applied.

Since the overall structure of the rotary compressor having a two-cylinder structure of the present invention is the same as that of the conventional example described above, the description thereof will be omitted, and only the structure of the main part will be described.

In FIG. 1, a rotary compression machine section 20 housed in a closed container 1 has cylinders 21 and 22 having different heights and different cylinder inner diameters, and a compression chamber formed by the cylinders 21 and 22. To the piston 23,
24 are accommodated. The pistons 23 and 24 are different in height and eccentricity of the rotary shaft 25, and are eccentrically mounted on shaft eccentric portions 26 and 27, respectively.
The compression action of the refrigerant is performed by the eccentric rotation of 3, 24.

Further, refrigerant is guided from an accumulator 28 provided symmetrically outside the compression chamber of the compression mechanical section 20 and the closed casing 1 through a suction pipe 29 to a compression chamber of each of the cylinders 21 and 22 from a suction hole 30.

By the way, as a refrigerant for a compressor used in a rotary compressor, for example, HFC (hydrofluorocarbon) 32 (R32) refrigerant and HFC1
Use of a mixed refrigerant of 25 (R125) refrigerant is considered. This mixed refrigerant is a conventional R22 HCFC
(Hydrochlorofluorocarbon) about 1.
Five times the refrigeration capacity is expected, but the saturation pressure is about 1.7
Double. The mixing ratio of R32 and R125 in the HFC mixed refrigerant is 40 wt% to 60 wt% to 60 wt% to 40 wt%.
The degree is preferred.

Since the discharge pressure of the HFC mixed refrigerant whose saturation pressure becomes 1.7 times rises, the volume of the cylinder excluded can be reduced to make the rotary type compression machine section 20 more compact. The structure of the suction pipes 12 and 13 led to the suction holes of the cylinders 7 and 8 becomes difficult. The reason is that the guide pipe 14
Is fixed to the closed container 1. This guide pipe 14
The portion to be welded to the closed vessel 1 has an inner diameter dimension such that a gap is formed between the outer peripheral surface of the suction pipe 12 and the welding pipe, thereby preventing partial melting of the suction pipe 12 due to welding heat. . However, if the height of the cylinder is reduced due to downsizing, this configuration cannot be performed. Thus, the above-described configuration solves the problem.

Further, since the guide pipes 14 are juxtaposed in the vicinity of the guide pipes 14 of the closed container 1, the pressure resistance of the container is the weakest. However, in this closed type compressor, the guide pipes 14 are formed at symmetrical positions. So closed container 1
Since the case rigidity and pressure resistance can be improved, the reliability of the compressor can be improved.

If the height of the cylinder is reduced to reduce the size and size of the rotary compressor, the guide pipe 14
It is expected that the pitch between them will be quite close and smaller.

However, in this rotary compressor, even if the size and size of the rotary compressor are reduced, there is no problem because the positions of the suction holes 30 of the cylinders 21 and 22 are symmetrical.

Next, another embodiment of the rotary compressor will be described with reference to FIGS.

Since the overall configuration of the rotary compressor of the two-cylinder structure of the present invention is the same as that of the above-described conventional example, the description thereof will be omitted, and only the configuration of the main part will be described.

In FIG. 2, a rotary type compression machine section 40 housed in a closed container 1 has cylinders 41 and 42 having different heights and different cylinder inner diameters, and a compression chamber formed by the cylinders 41 and 42. Piston 43,
44 are accommodated. The pistons 43 and 44 are eccentrically mounted on shaft eccentric portions 46 and 47 having different heights and different amounts of eccentricity of the rotating shaft 45, respectively.
The compression action of the refrigerant is performed by the eccentric rotation of 3, 44.

Further, the refrigerant flows from the accumulator 48 provided symmetrically outside the compression chamber of the compression machine section 40 and the closed casing 1 through the suction pipes 49, 50 having different inner diameters, and from the suction pipes 49, 50 to the cylinders 41, 42. To the compression chamber.

The guide pipes 51 and 52 are airtightly fixed to the closed container 1. The portions of the guide pipes 51 and 52 to be welded to the closed casing 1 have an inner diameter such that a gap is formed between the guide pipes 51 and 52 and the outer peripheral surfaces of the suction pipes 49 and 50. To prevent partial fusing. Further, the guide pipes 51, 5
By setting the guide pipes 51 and 52 at symmetrical positions in the vicinity of 2, the strength of the container can be improved and the rigidity of the container can be increased.

In the embodiment of the present invention, the rotary compressor has been described. However, the present invention is not necessarily limited to a vertical compressor, and a horizontal compressor may be used.

[0030]

According to the compressor of the present invention, in order to solve the above-mentioned problem, a refrigerant mixture of HFC32 or HFC125 is used as a refrigerant as described in claim 1.
Two compressor elements having substantially the same volume driven by a drive element having an electric motor in a closed vessel are disposed axially through a partition plate, and the two compressor elements are provided with a cylinder and an eccentric part. A shaft having a shaft, a piston rotatably provided on the eccentric portion, and eccentrically rotating in the cylinder together with the eccentric portion of the shaft, and a slidably inserted cylinder, partitioning the compression chamber and the suction chamber. A vane, an elastic body for pressing the vane against the piston, a suction hole for introducing a compressed refrigerant, and a discharge hole for discharging the compressed refrigerant, and further, at both axial ends of each of the compressor elements. An end plate having a bearing for the shaft and a fastening portion for connecting the both end plates and a compression element are provided to form a two-cylinder rolling piston type rotary compressor, and the two eccentric portions of the shaft are arranged in the same knitting direction. And the two compression elements Direction Linda suction holes approximately 1
This is a two-cylinder rotary compressor shifted by 80 degrees.

Further, in order to solve the above-mentioned problem, a compressor according to the present invention is characterized in that, in addition to the contents described in claim 1, two eccentricities of the shaft are identically eccentric. The core amount and the outer diameter are the same.

Further, in order to solve the above-mentioned problem, the compressor according to the present invention is configured such that the direction of the suction holes of the cylinders of the two compression elements is substantially the same as that of the first aspect. In a two-cylinder rotary compressor which is shifted by 180 degrees, the two compressor elements have different cylinder heights and cylinder inner diameters.

Further, in order to solve the above-mentioned problem, the compressor according to the present invention has a suction hole having a direction of approximately 18 in addition to the above-described claim.
In a two-cylinder rotary compressor shifted by 0 degrees, a suction pipe is provided only in the cylinder having a higher cylinder height, and a communication passage from one suction hole to the other suction hole is provided to the other cylinder in a partition plate. This is a two-cylinder rotary compressor provided.

With this configuration, the hermetic compressor can be reduced in size and size. Even if the compressor is small and compact, stress concentration is reduced in the suction penetrating portion where the pressure resistance of the container may be reduced. , The rigidity of the container can be increased, and the reliability can be improved. Furthermore, the workability of mounting the guide pipe can be improved. HF for compressor refrigerant
Since the HFC mixed refrigerant of C32 and HFC125 is used, the saturation pressure is high, the refrigerant characteristics are excellent, the compressor capacity can be improved, and the HFC mixed refrigerant is a refrigerant that is friendly to the global environment without destroying the ozone layer. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a hermetic compressor according to the present invention.

FIG. 2 is a longitudinal sectional view showing another embodiment of the hermetic compressor according to the present invention.

FIG. 3 is a longitudinal sectional view showing a conventional hermetic compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2-1 Stator 2-2 Rotor 3, 20, 40 Compression machine part 4, 25, 45 Rotary shaft 5, 33 Main bearing 6, 34 Secondary bearing 7, 8, 21, 22, 41, 42 Cylinder 9, 10, 23, 24, 43, 44 Piston 11, 28, 48 Accumulator 12, 13, 29, 49, 50 Suction pipe 14, 32, 51, 52 Guide pipe 26, 27, 46, 47 Shaft eccentric part 30 Suction hole 31 Communication hole 35 Divider

Claims (4)

[Claims] 1. A compressor using a mixed refrigerant of HFC32 or HFC125 as a refrigerant, and two compressor elements having substantially equal suction volumes driven by a drive element having an electric motor in a closed container are arranged in an axial direction via a partition plate. And the two compressor elements are a cylinder, a shaft having an eccentric portion, and a piston rotatably provided on the eccentric portion and eccentrically rotating inside the cylinder together with the eccentric portion of the shaft, A vane slidably inserted into the cylinder to partition the compression chamber and the suction chamber; an elastic body for pressing the vane against the piston; a suction hole for introducing a compressed refrigerant; and a discharge hole for discharging the compressed refrigerant. Further, an end plate having a bearing for the shaft and a fastening portion connecting the end plate and the compression element are provided at both axial ends of each of the compressor elements to provide a two-cylinder rolling piston type rotating pressure. A two-cylinder rotary compressor in which the two eccentric portions of the shaft are in the same eccentric direction, and the directions of the suction holes of the cylinders of the two compression elements are shifted by approximately 180 degrees. 2. The two-cylinder rotary compressor according to claim 1, wherein the two eccentric portions of the shaft have the same eccentric amount and the same outer diameter. 3. The two-cylinder rotary compressor according to claim 1, wherein the two compressor elements have different cylinder heights and cylinder inner diameters. 4. A suction pipe is provided only in a cylinder having a higher cylinder height, and a communication passage connecting from one suction hole to the other suction hole is provided in the other cylinder in a partition plate.
A two-cylinder rotary compressor according to claim 1.