JP2001099083A - Two-cylinder rotary comperssor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a pressure resistant characteristic without increasing thickness of a closed container. SOLUTION: Two suction pipes 40 (40a, 40b) to be provided corresponding to adjacent two compressing elements 20 (20a, 20b) are fixed to a closed container 10 with a space between them larger than a space between each compressing element 20 (20a, 20b). With this structure, a pressure resistant characteristic of the closed container 10 is improved without interesting thickness of the closed container 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a two-cylinder rotary compressor used for a refrigeration system such as an air conditioner.

[0002]

2. Description of the Related Art Conventionally, rotary compressors have been frequently used in refrigerating apparatuses such as air conditioners, and among them, multi-cylinder rotary compressors have been increasingly used in order to improve quietness and performance.

This multi-cylinder rotary compressor has a configuration in which compression elements having the same configuration are provided adjacent to each other, and FIG. 2 shows a configuration of a two-cylinder rotary compressor.

[0004] The two-cylinder rotary compressor comprises a closed vessel 1
Upper and lower two compression elements 120 (121, 122) in 10
, And a driving element 130 for driving them.

[0005] Each of the compression elements 120 is fitted with a suction pipe 140 (141, 142) extending from outside the machine. The suction pipe 140 is fixed to the closed container 110 by welding or the like adjacent thereto.

[0006] As a result, the refrigerant is sucked into the compression element 120 from outside the machine via the suction pipe 140, compressed, temporarily discharged into the closed vessel 110, and then discharged from the discharge pipe 145 to the outside of the machine.

[0007] As a refrigerant used in such a refrigeration system, R12 refrigerant has been mainly used so far.
However, the use of this R12 refrigerant is restricted because it contains chlorine that destroys the ozone layer, and a refrigerant instead of this has been developed.

That is, CFCs such as R12 (Chloro)
Fluoro Carbon refrigerant contains chlorine, which destroys the ozone layer, so new production was discontinued at the end of 1995.

On the other hand, HCFCs such as R22 (Hydr
o Chloro FluoroCarbon) refrigerant contains chlorine, but it also contains hydrogen, and the degree of ozone depletion is small because it contains hydrogen. At the same time, refrigerants such as R22 will be discontinued in 2020 It is decided to be.

[0010] Therefore, R40 which does not contain chlorine and does not destroy the ozone layer containing hydrogen is used as an alternative Freon refrigerant.
HFC such as 4A, R410A, R134A, etc.
Fluoro Carbon) refrigerants have been developed and are being used.

[0011]

However, such an HFC refrigerant has the following problems because the discharge pressure when discharged from the compression element 120 is higher than that of the conventional refrigerant.

That is, as described above, the refrigerant flows into the closed container 11.
The air is sucked into the compression element 120 through the suction pipe 140 fixed adjacent to the cylinder 0, compressed by the compression element 120, and then discharged into the closed container 110.

As a result, the pressure in the sealed container 110 becomes higher than in the prior art, and a portion having a low strength, for example, the suction pipe 1
There is a problem that a crack occurs in the portion P of the closed container 110 adjacent to the portion 40.

In particular, since the suction pipe 140 is welded to the closed container 110 by silver brazing or the like, the welded portion and its vicinity are annealed, and the strength is reduced as compared with other portions.

Of course, it is possible to increase the thickness of the sealed container 110 in response to the increase in internal pressure when the refrigerant is changed to the HFC refrigerant, but in such a case, the compressor becomes heavier, The increase in the amount of members used for the sealed container 110 causes an increase in cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a two-cylinder rotary compressor capable of improving pressure resistance without increasing the thickness of a closed container.

[0017]

According to a first aspect of the present invention, there is provided a compressor having two compression elements for compressing a refrigerant, and a compressor for driving the compressor. The drive means is housed in a closed container, and a suction pipe fitted with the compression element is fixed to the closed container, and the refrigerant is guided from outside the machine to the compression element, and the refrigerant compressed by the compression element is placed in the closed container. In a two-cylinder rotary compressor that is discharged once and then discharged outside the machine, two suction pipes provided corresponding to two adjacent compression elements are hermetically sealed so as to be wider than an interval formed by each compression element. Stick to the container,
It is characterized in that the pressure resistance can be improved without increasing the thickness of the closed container.

According to a second aspect of the present invention, the suction pipe is fitted at a position shifted from the intermediate position of the compression element so that the suction pipes are adjacent to each other at an interval larger than the interval between the compression elements.
It is characterized in that the pressure resistance can be improved without increasing the thickness of the closed container.

The invention according to claim 3 is characterized in that the refrigerant is an HFC refrigerant.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a two-cylinder rotary compressor according to the present invention.

The refrigerant used is R404A, R41
HFC (Hydro) such as 0A, R407C, R134A, etc.
Fluoro Carbon) refrigerant.

This two-cylinder rotary compressor has a compression means in which two compression elements 20 (20a, 20b) of substantially the same configuration are arranged vertically, and a drive means provided as a drive means provided above the compression means. It has elements 30, which are housed in a closed container 10 (11, 12).

In the following description, the compression element 20 provided on the drive element 30 side is referred to as a first compression element 20a, and the compression element 20 provided thereunder is referred to as a second compression element 20b.

The sealed container 10 includes a cylindrical shell portion 12 and an end cap 11 fixed to the shell portion 12 by arc welding or the like.
And the driving element 3
Terminal 46 serving as a relay terminal when power is supplied to 0
And a discharge pipe 45 for discharging the compressed refrigerant out of the machine.

A suction pipe 40 (40a, 40b) for guiding the refrigerant from outside the machine to the compression element 20 is fixed adjacent to the shell part 12 by means of silver brazing or the like, and the bottom thereof is an oil reservoir 44 for storing oil. It has become.

The driving element 30 is a so-called magnetic pole concentrated winding type D
It is composed of a C brushless motor or the like, and includes a rotor 32 and a stator 31 fixed to the shell portion 12, and a rotation shaft 33 thereof is connected to the compression element 20 to transmit a rotational force. .

The rotary shaft 33 is rotatably supported by a first bearing 50 and a second bearing 51, and a pump 47 for pumping oil from an oil reservoir 44 is provided at a lower center portion thereof. The pumped oil is supplied to each sliding portion via an oil passage 48.

Each compression element 20 has a suction pipe 40 inserted therein and a discharge port 41 (41a, 41b).

Therefore, the refrigerant supplied from outside the machine via the accumulator 7 flows from the suction pipe 40 to the first compression element 20.
a and is compressed by the second compression element 20b, and after being compressed here, is discharged from the discharge port 41 into the closed container 10 and discharged from the discharge pipe 45 to the outside of the machine.

The first compression element 20a and the second compression element 20b
Each compression element 20 has a cylindrical cylinder 21 (21a, 21b), and a roller 22 (22a, 22b) is disposed on the cylinder 21.

The roller 22 is formed in a cylindrical shape, and a crank 23 (23a, 23b) is disposed inside the roller 22. A vane (not shown) is in contact with the outer surface of the roller 22.

Since the crank 23 is fixed to (or integrally formed with) the rotating shaft 33, the rotation of the crank 23 causes the roller 22 to eccentrically rotate.

At this time, one end of the outer surface of the roller 22 is always in contact with the cylinder 21 with a predetermined clearance, so that a crescent-shaped space is formed between the cylinder 21 and the roller 22.

Since the vane is in contact with the outer surface of the roller 22, the vane divides the crescent-shaped space into a suction chamber and a compression chamber (not shown).

Since the inner diameter of the cylinder 21 and the outer diameter of the roller 22 do not change, the crescent-shaped space volume is always constant even when the roller 22 rotates. However, as the roller 22 rotates, the contact position between the roller 22 and the cylinder 21 changes, so that the direction of the crescent-shaped space changes.

However, since the position of the vane does not change, the volume ratio between the suction chamber and the compression chamber formed by dividing the crescent space by the vane changes with the rotation of the roller 22, and the volume of the suction chamber becomes smaller. When expanded, the volume of the compression chamber is reduced and the refrigerant is compressed.

The discharge port 41 is provided on the first
The compression element 20 is provided so as to discharge the refrigerant toward the upper end cap 11, and the second element
The compression element 20 is provided so as to discharge the refrigerant toward the cup muffler 43 provided on the bottom side of the shell portion 12.

A discharge valve (not shown) is provided at the discharge port 41. When the refrigerant compressed as the compression chamber is reduced reaches a discharge pressure specified by the discharge valve, the refrigerant flows from the discharge port 41 to the closed container. It is discharged into 10.

The rollers 22 generate vibrations when eccentrically rotating, and the rotation phases of the rollers 22a and 22b are shifted by 180 degrees so as to cancel the vibrations. That is, the crank 23a and the crank 23b
Is provided symmetrically about the rotation axis 33.

With such a configuration, the refrigerant is sucked into the compression element 20 from the suction pipes 40 arranged above and below, compressed by the compression element 20 and discharged from the discharge port 41 into the closed container 10, and then discharged. It is discharged out of the machine from the pipe 45.

Therefore, the pressure in the closed vessel 10 is equal to the discharge pressure. At this time, if a refrigerant having a high pressure such as HFC refrigerant is used, the strength of the portion Q where the suction pipe 40 is provided adjacently becomes weak. Or cracks may occur.

In order to cope with such inconveniences, in the present invention, the pressure resistance is improved by increasing the distance between the suction pipes 40a and 4b.

That is, the conventional suction pipe 40 is provided so as to fit at an intermediate position of the compression element 20. Therefore, in the present invention, the position of the suction pipe 40a in the first compression element 20a is shifted toward the drive element 30, and the position of the suction pipe 40b in the second compression element 20b is shifted toward the cup muffler 43.

Accordingly, since each suction pipe 40 can be mounted at a position deviated from the center position of each compression element 20, the interval between each suction pipe 40 can be widened and the thickness of the shell portion 12 can be increased. It is possible to cope with an increase in internal pressure without performing.

In the conventional configuration shown in FIG.
The center position of the suction pipe 140 coincides with the center position of the suction pipe 140, and the adjacent distance between the suction pipes 140 is H1. On the other hand, in the configuration of the present invention shown in FIG. 1, the intermediate position of the compression element 20 and the center position of the suction pipe 40 are displaced from each other. H
It is 1.

Although the above description has been made on the assumption that the two-cylinder rotary compressor is of a vertical type, it is obvious that the present invention is not limited to this and may be of a horizontal type.

[0047]

As described above, according to the first aspect of the present invention, the interval between two suction pipes provided corresponding to two adjacent compression elements is wider than the interval between each compression element. Thus, the pressure resistance can be improved without increasing the thickness of the sealed container, and the safety and reliability are improved.

According to the second aspect of the present invention, the suction pipe is fitted at a position deviated from the intermediate position of the compression element, and the suction pipe is adjacent to the compression element at an interval larger than the adjacent interval. The pressure resistance can be improved without increasing the thickness of the sealed container, and safety and reliability are improved.

According to the third aspect of the present invention, since the refrigerant used is HFC refrigerant, it is possible to provide a highly safe compressor without destroying the ozone layer and without increasing the cost at all. Become.

[0050]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a two-cylinder rotary compressor applied to the description of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a two-cylinder rotary compressor applied to a description of a conventional technique.

[Explanation of symbols]

 10 (11, 12) Closed container 20 (20a, 20b) Compression element 30 Drive element 40 (40a, 40b) Suction pipe 41 (41a, 41b) Discharge port

Continuation of the front page (72) Inventor Hiroyuki Sawabe 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Midori Nikawame 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka No. Sanyo Electric Co., Ltd. (72) Inventor Masazumi Sakaniwa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3H029 AA04 AA09 AA13 AA21 AB03 BB32 BB44 CC09 CC24

Claims (3)

[Claims] 1. A compression means comprising two adjacent compression elements for compressing a refrigerant, and a driving means for driving the compression means are housed in a closed container, and fitted to the closed container with the compression element. The combined suction pipe is fixed and the refrigerant is guided to the compression element from the outside of the machine, and the refrigerant compressed by the compression element is once discharged into the closed vessel and then discharged outside the machine.
In the cylinder rotary compressor, two suction pipes provided corresponding to two adjacent compression elements are fixed to the closed container so as to be wider than an interval between adjacent compression elements. Rotary compressor. 2. The compression element is formed in a substantially cylindrical shape,
2. The suction pipe according to claim 1, wherein the suction pipe is fitted at a position deviated from an intermediate position of a side of the suction pipe, and the suction pipes are adjacent to each other at an interval larger than an interval between adjacent compression elements. Cylinder rotary compressor. 3. The two-cylinder rotary compressor according to claim 1, wherein the refrigerant is an HFC refrigerant.