JPH10103223A - Sealed type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve C.O.P. by making the dimension of a clearance between an upper cylinder and an upper vane and between the upper cylinder and an upper roller larger than the dimension of a clearance between a lower cylinder fixed on the upper cylinder and a lower vane and between the lower cylinder and a lower roller. SOLUTION: The dimension of a clearance between an upper cylinder 17A and a vane 20A and between a rotary shaft 4 of the upper cylinder 17A and an orthogonal direction is A, and the dimension of a clearance among a roller 19A, the rotary shaft 4 of the upper cylinder 17A, and an orthogonal direction when the roller 19A approaches the upper cylinder 17A most is B. The dimension of a clearance among a lower cylinder 17B, a vane 20B, a rotary shaft 4 of the lower cylinder 17B, and an orthogonal direction is a, and the dimension of a clearance among a roller 19B, the rotary shaft 4 of the lower cylinder 17B, and an orthogonal direction when the roller 19B approaches the lower cylinder 17B most is b. Here, A>a, and B>b. Consequently, it is possible to improve C.O.P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor, and more particularly, to a hermetic compressor used in a refrigeration system using an HFC-based refrigerant or the like which does not have a risk of destruction of an ozone layer. And C. O. The present invention relates to a hermetic compressor with improved P.

[0002]

2. Description of the Related Art Conventionally, in a hermetic compressor having a plurality of cylinders for compressing a refrigerant drawn into a hermetic container, an upper cylinder is shrunk into the hermetic container,
It is fixed by spot welding or the like, and the lower cylinder is fixed to this upper cylinder. Generally, if the size of the gap between the cylinder and the vane of the hermetic compressor or the size of the gap between the cylinder and the roller is too large, refrigerant leaks and C.I. O. P decreases. However, since the upper cylinder is deformed by thermal stress when it is fixed in the closed container as described above, the size of the gap between the cylinder and the vane and the size of the gap between the cylinder and the roller must be reduced. However, it was manufactured with reduced accuracy in consideration of this deformation. In addition, the lower cylinder has been manufactured with reduced accuracy, similarly to the upper cylinder. For this reason, C.I. O. P is bad, C.I. O. There has been a demand for a hermetic compressor with improved P.

Conventionally, the refrigerant used in refrigerators is R-502 comprising dichlorodifluoromethane (R-12) or an azeotropic mixed refrigerant R-22 and monochloropentafluoroethane (R-115a). Many. However, the above refrigerant has a high ozone depletion, and when released into the atmosphere and reaches the ozone layer above the earth, the ozone layer is destroyed. This destruction of the ozone layer is caused by chlorine groups (Cl) in the refrigerant. Therefore, refrigerants having a low chlorine group content, such as chlorodifluoromethane (HC
FC-22, R-22), chlorine-free refrigerants, such as difluoromethane (HFC-32, R-32), pentafluoroethane (HFC-125, R-125), 1,1,1,2 -Tetrafluoroethane (HFC-13
4a, R-134a) or two or two of these
A mixture of more than one species (eg, R410A) is considered as these alternative refrigerants (hereinafter referred to as HFC-based refrigerants).

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hermetic compressor used for a refrigeration system using an HFC-based refrigerant or the like which has no risk of destruction of the ozone layer. O.
An object of the present invention is to provide a hermetic compressor with improved P.

[0005]

As a result of repeated studies to solve the above-mentioned problems, the present inventors have found that the size of the gap between the upper cylinder and the upper vane, which is deformed by thermal stress, the upper cylinder and the upper roller The size of the gap dimension between the lower cylinder and the lower vane fixed to the upper cylinder without being subjected to thermal stress, or larger than the gap dimension between the lower cylinder and the lower roller, The inventors have found that the above problems can be solved, and have completed the present invention.

According to a first aspect of the present invention, an electric element having a rotating shaft on the upper side and a plurality of compression elements driven by the rotating shaft of the electric element are housed on the lower side, and the sucked refrigerant is stored in the housing. After being compressed by a compression element and discharged into a closed container, the hermetic compressor is configured to be discharged outside the closed container, and the plurality of compression elements are each provided with a cylinder having a suction port, and A roller that rotates in the cylinder by the eccentric part of the rotating shaft, a vane that contacts the roller and separates the inside of the cylinder, an upper bearing that seals the opening of the upper cylinder, a lower bearing that seals the opening of the lower cylinder, and each bearing. And a cup muffler covering the discharge valve, and an upper cylinder is fixed by welding in the closed container, and the lower cylinder is In the hermetic compressor fixed to the upper cylinder, the size of the clearance between the upper cylinder and the upper vane is made larger than the size of the clearance between the corresponding lower cylinder and the lower vane, and the upper cylinder and the upper roller The size of the gap between the lower cylinder and the lower roller is larger than the size of the gap between the corresponding lower cylinder and the lower roller.

According to a second aspect of the present invention, in the hermetic compressor according to the first aspect, the size of the gap between the lower cylinder and the lower vane is determined by changing the size of the gap between the corresponding upper cylinder and the upper vane. The size is reduced by 30% from the size.

According to a third aspect of the present invention, in the hermetic compressor according to the first or second aspect, the size of the gap between the lower cylinder and the lower roller is determined by adjusting the size of the gap between the corresponding upper cylinder and the upper roller. 3 from the size of the gap size with
It is characterized by being reduced by 0%.

According to a fourth aspect of the present invention, in the hermetic compressor according to the first to third aspects, the refrigerant is HFC.
It is characterized by being a refrigerant mainly composed of a system refrigerant or an HFC system refrigerant.

[0010]

FIG. 1 is a sectional view showing an example of a hermetic compressor according to the present invention. In FIG. 1, reference numeral 1 denotes a hermetic container having an oil reservoir 2 in which oil is stored at the bottom, in which an electric element 3 is provided on the upper side, and a rotary compressor driven by a rotating shaft 4 of the electric element is provided on the lower side. Element 5 is housed. The electric element 3 includes a stator 6 fixed to the inner wall of the closed casing 1 and a rotor 8 inserted into the rotating shaft 4 via an air gap 7 inside the stator. The stator 6 includes an iron core 10 having an oil return hole 9 formed by notching on the outer periphery, and a winding 12 having a coil end 11 facing vertically. 13 is an iron core of the rotor 8.

The rotary compression element 5 has two upper cylinders 17
A, a lower cylinder 17B is provided. Upper cylinder 1
7A is welded and fixed in the closed container 1, and the lower cylinder 17B is fixed to the upper cylinder 17A via the intermediate partition plate 16. A roller 19A (upper roller) that rotates in the cylinder 17A by the eccentric portion 18A of the rotating shaft 4, a vane 20A (upper vane) that contacts the roller and separates the inside of the cylinder 17A, and an upper bearing 21 that seals the opening of the cylinder 17A. And a discharge port 23A provided with a discharge valve 23 provided in the upper bearing portion 21, and a cup muffler 24A covering the discharge valve 23.
A discharge port 25 is provided on the upper surface of the cup muffler. The eccentric portion 18B of the rotating shaft 4 allows the cylinder 1
Roller 19B (lower roller) rotating inside 7B, and vane 20B contacting this roller and dividing inside cylinder 17B
(Lower vane), a lower bearing portion 22 that seals the opening of the cylinder 17B, a discharge port provided with a discharge valve (not shown) provided in the lower bearing portion 22, and a cup muffler 24B that covers the discharge valve. ing.

Reference numeral 26 denotes a refrigerant discharge pipe, which is provided through an end cap 27 which seals the upper part of the closed casing 1. 28 is an accumulator.
Arrows indicate the flow of the refrigerant.

In the hermetic rotary compressor constructed as described above, the suction port 30 is connected via the accumulator 28.
The refrigerant flowing into the cylinder 17A from A is a roller 19A
And compressed by the cooperation of the vane 20A and the discharge port 2
The discharge valve 23 is opened from 3A and discharged into the cup muffler 24A. The refrigerant in this cup muffler is
5 is discharged through the air gap 7 of the electric element 3 to the upper part of the electric element.

On the other hand, the refrigerant flowing into the cylinder 17B from the suction port 30B via the accumulator 28 is similarly compressed by the cooperation of the roller 19B and the vane 20B, and opens a discharge valve (not shown) from a discharge port (not shown). The ink is discharged into the cup muffler 24B. The refrigerant in the cup muffler 24B is introduced into the lower part of the electric element 3 through the passage 31 inside the closed container and the passage 32 outside the closed container, and is discharged to the upper part of the electric element through the air gap 7 and the like. The refrigerant discharged to the upper part of the electric element 3
The heavy oil contained inside is swung away by the centrifugal force of the swirling to separate it off the inner wall side of the sealed container 1. The refrigerant from which the oil has been separated is discharged out of the closed vessel 1 from the discharge pipe 26. Then, the separated oil is returned to the oil reservoir 2 from the oil return hole 9 of the stator 6.

FIG. 2 is a plan view of the upper cylinder. A
Is the vane 20A of the upper cylinder 17A and the upper cylinder 1
7A shows the magnitude of the clearance dimension in the direction perpendicular to the rotation axis 4 with respect to the rotation axis 4A, and B represents the rotation axis 4 between the roller 19A and the upper cylinder 17A when the roller 19A comes closest to the upper cylinder 17A.
And the size of the gap dimension in the direction perpendicular to the direction.

FIG. 3 is a plan view of the lower cylinder. a
Is the vane 20B of the lower cylinder 17B and the lower cylinder 1
7B shows the magnitude of the clearance dimension in the direction perpendicular to the rotation axis 4 with respect to the rotation axis 4 of the roller 19B and the lower cylinder 17B when the roller 19B comes closest to the lower cylinder 17B.
And the size of the gap dimension in the direction perpendicular to the direction.

FIGS. 4A and 4B are sectional views of the upper cylinder. C is upper cylinder 17A and roller 19A
Indicates the size of the gap in the direction of the rotating shaft 4 in the direction of the rotating shaft 4, and D indicates the size of the size of the gap in the direction of the rotating shaft 4 between the upper cylinder 17A and the vane 20A.

FIGS. 5A and 5B are sectional views of the lower cylinder. c is lower cylinder 17B and roller 19B
Indicates the size of the gap dimension in the direction of the rotating shaft 4 in the direction of the rotating shaft 4, and d indicates the size of the gap size in the direction of the rotating shaft 4 of the lower cylinder 17B and the vane 20B.

In the hermetic compressor of the present invention, A>
a, B> b, C> c, D> d, and preferably these are reduced by 30%. In this way, even after the upper cylinder 17A is shrink-fitted in the closed container 1 and then slightly deformed due to thermal stress when being fixed by spot welding or the like, the upper cylinder 17A can be precisely fixed to the upper cylinder 17A. Since the manufactured lower cylinder 17B is fixed and manufactured, the C.I. O. P can be improved.

FIGS. 6A, 6B and 6C show an example of an assembly process of the hermetic compressor of the present invention. First,
In (a), the upper cylinder 17A to which the upper bearing unit 21 is connected is placed in the closed container 1, shrink-fitted, and fixed by spot welding or the like. 33, 34, 35 and 36 are fixing bolts. Next, in (b), the intermediate partition plate 16 is attached to the upper cylinder 17A fixed in the closed container 1.
The lower cylinder 17B and the lower bearing part 22 are inserted and these are fixed to the upper cylinder 17A by fixing bolts 33, 34, 35, 3
Fix using 6. (C) shows a state in which the upper bearing portion 21, the upper cylinder 17A, the intermediate partition plate 16, the lower cylinder 17B, and the lower bearing portion 22 are fixed in the sealed container 1.

[0021]

According to the present invention, as described above, the C.I. O. An improvement in P can be achieved. The hermetic compressor of the present invention has a simple structure, is economical, and has a large effect as described above, and has high industrial utility value.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a hermetic compressor of the present invention.

FIG. 2 is a plan view of an upper cylinder.

FIG. 3 is a plan view of a lower cylinder.

FIGS. 4A and 4B are cross-sectional views of an upper cylinder.

FIGS. 5A and 5B are cross-sectional views of a lower cylinder.

FIGS. 6A to 6C show an example of an assembly process of the hermetic compressor of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Oil reservoir 3 Electric element 4 Rotary shaft 5 Rotary compression element 6 Stator 7 Air gap 8 Rotor 9 Oil return hole 17A, 17B Cylinder 18A, 18B Eccentric part 19A, 19B Roller 20A, 20B Vane 21 Upper bearing part Reference Signs List 22 Lower bearing part 23 Discharge valve 23A Discharge port 24A, 24B Cup muffler 25 Discharge port 26 Refrigerant discharge pipe 27 End cap 30A, 30B Suction port 31, 32 Passage 33-36 Fixing bolt

Claims (4)

[Claims] An airtight container that houses an electric element having a rotating shaft on the upper side and a plurality of compression elements driven by the rotating shaft of the electric element on the lower side, and compresses the sucked refrigerant by the compressing element. The compressor is a hermetic compressor that discharges the inside of the closed container after discharging into the closed container, and each of the plurality of compression elements includes a cylinder having a suction port and an eccentric portion of the rotary shaft. A roller for rotating the
A vane that separates the inside of the cylinder in contact with this roller, an upper bearing that seals the opening of the upper cylinder, a lower bearing that seals the opening of the lower cylinder, a discharge port provided with a discharge valve provided in each bearing, And a cup muffler covering the discharge valve, and an upper cylinder is welded and fixed in the closed container, and the lower cylinder is fixed to the upper cylinder by an upper cylinder and an upper vane. The size of the gap between the lower cylinder and the lower roller is larger than the size of the gap between the corresponding lower cylinder and the lower vane, and the size of the gap between the upper cylinder and the upper roller is A hermetic compressor characterized by being larger than the gap size. 2. The hermetic seal according to claim 1, wherein the size of the gap between the lower cylinder and the lower vane is reduced by 30% from the size of the corresponding gap between the upper cylinder and the upper vane. Type compressor. 3. The apparatus according to claim 1, wherein the size of the gap between the lower cylinder and the lower roller is reduced by 30% from the size of the gap between the corresponding upper cylinder and the upper roller. The hermetic compressor as described. 4. The refrigeration apparatus according to claim 1, wherein the refrigerant is an HFC-based refrigerant or a refrigerant mainly composed of an HFC-based refrigerant.