JP3354348B2 - 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 for operating a refrigerator or an air conditioner, and more particularly to an oil cooler pipe for cooling oil of a compressor, and in which oil for lubrication is filled after production. The present invention relates to an improvement in a method of sealing a refrigerant pipe when storing a hermetically sealed electric compressor.

[0002]

2. Description of the Related Art Conventionally, a hermetic electric compressor provided with an oil cooler (hereinafter abbreviated as a compressor) is disclosed in
It is configured as shown in -30311. That is, the compression unit and the electric motor unit are housed in a closed container,
Lubricating oil is sealed in this sealed container to lubricate each sliding part, and in order to cool the lubricating oil, an oil cooler pipe through which a low-temperature refrigerant flows is fixed to the lower part of the sealed container by welding. I have.

Here, the oil cooler pipe is fixed by the following method. First, the oil cooler pipe is formed into a predetermined shape (U-shape or circular shape). On the other hand, holes are formed in two places on the side wall of the closed container.

[0004] Next, the formed oil cooler pipe is arranged inside a closed container, and both ends thereof are inserted into the two holes from the inside of the closed container.

[0005] Finally, between the oil cooler pipe and the periphery of the hole of the closed vessel, a silver solder is poured manually to fix the oil cooler pipe to the closed vessel by welding.

[0006] As described above, since the oil cooler pipe is fixed from the inside of the closed vessel, resistance welding or the like is not suitable and is not performed.

However, according to the above configuration, since the oil cooler pipe is welded by silver brazing by hand, there is a problem that not only the productivity is poor but also there are not many leak defects at the welded portion. At the same time, there is a problem that the flux used at the time of silver brazing adheres to and remains on the inner wall of the closed container, and the chlorine component of the flux causes a large amount of sludge to be generated.

[0008] By the way, there are cases where the manufactured compressor is stored without enclosing lubricating oil therein, and cases where lubricating oil is encased and stored therein. When the latter lubricating oil is sealed and stored for a long time, the refrigerant charge pipe attached to the compressor,
It is necessary to seal the opening of the pipe so that the outside air or moisture does not enter from each pipe such as the refrigerant suction pipe and the refrigerant discharge pipe to deteriorate the lubricating oil.

Conventionally, the sealing has been performed by fitting a rubber stopper into the opening of the tube, or by fixing an iron stopper to the opening of the tube by welding.

However, in the case of a rubber stopper, the rubber material (for example, neoprene material) itself has a large hygroscopic property, so that there is continuous intrusion of moisture. Further, there is a problem that the seal becomes insufficient due to the deterioration, deterioration and elasticity of the rubber stopper over time. On the other hand, in the method using the welding of the iron plug, it takes time and effort to perform the sealing operation, and there is a fear that an incomplete seal may be obtained when something unfamiliar to welding is performed. As described above, in the conventional sealing device, moisture is allowed to enter, and the moisture is adsorbed by the lubricating oil in the compressor, which may generate sludge that clogs the refrigeration cycle.

[0011]

The above-mentioned problem is caused by the restriction of fluorocarbons (for example, R1
With the abolition of 2), HF such as R134a
When a C (Hydrofluorocarbon) -based refrigerant is used and a polyol ester oil having good compatibility with the refrigerant is used, the amount of sludge generated due to contamination or the like greatly affects.

For this reason, the oil cooler piping welded by brazing is not particularly suitable for a compressor using this kind of alternative refrigerant or ester oil, and as a result, a brazing method will be applied to a compressor to be developed in the future. This could mean that the welded oil cooler piping could not be used.

Further, since the ester oil has a high hygroscopicity, when the compressor is filled with the lubricating oil and stored, the refrigerant pipe must be completely sealed.

The present invention has been made in view of the above points, and in welding an oil cooler pipe, a manual welding operation is abolished to enable automation of welding, thereby improving productivity by reducing man-hours. At the same time, while reducing the leak failure of the welded part, the oil cooler pipe can be used as a common pipe with other pipes such as a discharge pipe and a charge pipe,
It aims at reducing the manufacturing cost.

Further, when the compressor is stored with lubricating oil, the refrigerant pipe sealing device is improved so that the number of parts can be reduced, the operation can be performed reliably and easily, and the refrigerant pipe of the compressor can be sealed. An object of the present invention is to provide a compressor including:

Furthermore, by eliminating the use of flux, the cleanliness after welding is improved, and the refrigerant pipe is completely sealed when the compressor is stored with lubricating oil, thereby preventing the generation of sludge due to contamination and the like. An object of the present invention is to provide a compressor piping structure and a refrigerant pipe sealing device which are excellent in practicality and can be applied to a compressor using an alternative refrigerant and an ester oil.

[0017]

The present invention contains chlorine.
Fluorinated hydrocarbon refrigerants and polyol ester oils
Or highly polar oils such as polyol ether oils as base oils.
And the sealed lubricating oil in a sealed container.
The compression unit and the electric motor unit are housed in a container, and the refrigerant is hermetically sealed.
Refrigerant charge pipe to charge inside the container, sucks refrigerant
Seal the openings of pipes such as suction pipes and discharge pipes that discharge refrigerant.
A sealing device, and penetrates the container into the closed container.
To the hermetic electric compressor with fixed oil cooler piping
And the sealing device has a plug head larger than the diameter of the pipe.
Part such as rubber provided with a part and a plug part inserted into the pipe
A plug made of a material, and a fixing screw screwed into the plug.
The plug portion is expanded by screwing in the fixing screw.
And opening of the tube of the stopper head by the head of the fixing screw
Seal by pressing against the mouth, and install the oil cooler
The pipe has an annular fitting fixed to the oil cooler pipe in front.
A sealed type battery fixed inside the sealed container by resistance welding
It is a dynamic compressor.

In the present invention, a fluorinated hydrocarbon-based refrigerant containing no chlorine and a lubricating oil based on a highly polar oil such as a polyol ester oil or a polyol ether oil are sealed in a closed container. At the same time, the compression unit and the electric motor unit are housed in the closed container , and the refrigerant is charged in the closed container.
Refrigerant charge pipe, refrigerant suction pipe, refrigerant
Set up a sealing device to seal the opening of a pipe such as a discharge pipe for discharging.
And an oil cooler penetrating through the container in the closed container.
-In a hermetic electric compressor with fixed piping,
The device has a plug head larger than the pipe diameter of the pipe and the inside of the pipe.
A plug made of an elastic member such as rubber having a plug to be inserted.
And a fixing screw screwed into the plug body, wherein the fixing
The screw is screwed in to expand the stopper and secure the fixing screw.
Pressing the stopper head against the opening of the tube by the head of the holder
Seal at both ends of the oil cooler pipe.
A straight section is formed, and this straight section has an expanded section
And a constriction section connected to the external pipe is formed at the end of the expanded section
It was press-fitted into the expanded section and copper brazed and welded.
An annular fitting is provided, and both ends of the oil cooler pipe are forward.
The annular metal is passed through each hole of the closed container.
Is secured by resistance welding to the inside of the closed container.
It is a closed electric compressor .

Further, the present invention relates to a fluorine-containing hydrocarbon containing no chlorine.
Basic refrigerant and polyol ester oil or polyol
Lubricating oils based on highly polar oils such as ether oils
It is sealed in a closed container, and the compressed part is
And a motor section, and a refrigerant is charged in the closed container.
Refrigerant charge pipe, refrigerant suction pipe, refrigerant
Set up a sealing device to seal the opening of a pipe such as a discharge pipe for discharging.
In the closed hermetic electric compressor, the sealing device is
A plug head larger than the diameter of the pipe and a plug inserted into the pipe
A plug made of an elastic member such as rubber provided with a portion, and the plug
A fixing screw to be screwed into the fixing screw.
With the expansion of the plug portion and the head of the fixing screw,
Seal by pressing the stopper head against the opening of the tube
This is a hermetic electric compressor .

[0020]

[0021]

According to the present invention, the present invention does not contain chlorine.
Fluorinated hydrocarbon-based refrigerant and polyol ester-based oil or
Highly polar oils such as polyol ether oils are used as base oils
Lubricating oil and sealed hermetic sealed compressor
Applicable. That is, the oil cooler piping is
The ring bracket can be fixed simply by resistance welding in a closed container,
Enables automated welding and reduces man-hours to increase productivity
As well as the conventional leak from the brazed part
Can be reduced. In addition, the sealing device is used to screw in the fixing screws.
Therefore, the plug body head due to the expansion of the plug part and the head of the fixing screw
Presses the tube into the opening of the tube.
As a result, the seal at the opening of the pipe is improved,
Hermetic electric compressor that uses high ester oil and alternative refrigerant
It is suitable for.

According to the present invention, the present invention is characterized in that:
1 Similarly, a fluorinated hydrocarbon refrigerant containing no chlorine and a polio
Poles such as ether ether oil or polyol ester oil
And a lubricating oil based on highly oily base oil
It can be applied to a closed hermetic electric compressor. That is,
For the oil cooler pipe, press the annular fitting into the expanded section and press
Resistance welding in a sealed container
Can be fixed automatically, enabling welding automation and reducing man-hours.
Productivity as well as the conventional brazing
Reduction of leakage defects caused by contamination and contamination
The generation of sludge due to, for example, can be suppressed. And beyond that
Connection with external refrigerant pipes
The use of a small external pipe such as a discharge pipe
The manufacturing cost can be reduced by using common parts. Ma
In addition, the sealing device allows the plug to be expanded by screwing in the fixing screws.
The head of the plug body to the opening of the tube
Since the two effects of pressing are obtained,
And replace with ester oil with high hygroscopicity
It is suitable for a hermetic electric compressor using a refrigerant.

Further, according to the third aspect of the present invention, after the compressor is filled with lubricating oil, the refrigerant charging pipe, the refrigerant suction pipe, the refrigerant discharge pipe, and other pipes are made of a plug made of rubber or the like and fixedly screwed into the plug. The opening is closed by the screw. This place
When the fixing screw is screwed, the plug part entered into the pipe
Of the plug body head tube with the screw head for fixing
Pressing against the opening has two effects.
As a result, the seal at the opening of the pipe is improved,
Hermetic electric compressor that uses high ester oil and alternative refrigerant
It is suitable for.

[0024]

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 are views showing the structure of the compressor 1000, FIG. 1 is a front sectional view, FIG. 2 is a partial side sectional view, and FIG. 3 is a top view. In these figures, a reciprocating compression unit 300 connected to a motor unit 200 driven by electric power from a power supply unit 100 that supplies power supplies a refrigerant fluid sucked from a suction passage of a suction unit 600 via a valve device 500, for example, Compress the Freon and discharge unit 70
An assembly having a configuration for discharging from the discharge path of No. 0 is elastically attached to the inside of the closed container 900 by the buffer support portion 800 and stored.

Further, the lubricating oil 401 stored at the bottom of the sealed container 900 by the self-lubricating unit 400 is used to drive the electric motor unit 200.
The lubrication is performed by circulating and lubricating the mechanically moving part of the reciprocating compression unit 300.

FIGS. 4 and 5 are exploded perspective views showing the main parts of the hermetic electric compressor shown in FIGS. The functional parts indicated by the reference numerals are assembled by a combination indicated by a chain line, and are assembled and fixed or engaged by required set screws and set springs.

Stator 210, rotor 220, rotor shaft 2
30 and the frame with bearing 240 are integrally assembled to form the motor unit 200, and the power supply unit 1 is connected by the connector 250.
00 is connected.

The auxiliary frame 810 is fixed to the upper end of the stator 210, and has a helical spring 830 and a spring collar 820.
Are assembled together by fitting the upper part into a guide pin 811 provided in the bearing frame 240 and the auxiliary frame 810 and the lower part into a guide pin 840 provided in the lower container 910. .

A semi-lunar balancing plate 231 is integrally formed at the top end portion of the rotor shaft 230, and an eccentric pin 310 is implanted on the opposite side of the semi-lunar balancing plate 231 to form a circular track on the eccentric pin 310. The movement mechanism for performing the movement that draws is configured.

The part driven by the eccentric pin 310 is as follows.
As shown in FIG. 5, the T-shaped crank cylinder 330 has a horizontal cylinder portion 331 provided with long holes 331 </ b> A at the top and bottom and a sliding cylinder 320 inserted in the cylinder part. Bearing hole 3 of sliding cylinder 320 through hole 331A
By fitting the eccentric pin 310 into the 21, a motion mechanism for linearly reciprocating the vertical cylinder portion 332 of the T-shaped crank cylinder 330 is configured.

The vertical cylindrical portion 332 has a piston 340.
Is fitted in a crown shape, and the piston 340 is
The reciprocating motion is performed within the 50 cylinder holes 351, and a portion from the eccentric pin 310 to the cylinder 350 constitutes the reciprocating compression section 300.

A valve device 500 is mounted in contact with the cylinder 350. The valve device 500 includes a suction side valve body 51.
0, valve seat 520, reed valve 530, suppression repulsion piece (referred to as valve backer in this invention) 540 and gasket 5
50 are mainly constituted, these parts are sandwiched between the end face 352 of the cylinder 350 and the end face 713 of the substrate 710 constituting the discharge section 700, and then assembled by screwing. 5 is formed by forming an intake path along an arrow from right to left in the figure and a discharge path along an arrow from left to right in FIG.

A valve backer 540 is disposed on the back side of the reed valve 530 for suppressing the opening of the reed valve 530 for opening and closing the discharge port 522 of the fluid having the discharge pressure and the reverse pressure that repeats at high speed and for repelling. A body 560 is formed.
After the valve body 560 is housed in the recess 523 of the valve seat 520, the end face 7 of the substrate 710 disposed on the back side of the valve body 560.
One end side is pressed and fixed by the protruding portion 714 provided on the thirteen.

The suction-side valve body 510 is a flat leaf spring, for example, a reed valve 511 formed by providing a slit near the center of a thin stainless steel leaf spring whose both surfaces are polished.
And a discharge hole 512 slightly larger than a discharge port 522 of a valve seat 520 described later is provided on the base side of the reed valve 511.

The reed valve 530 is made of a flat plate spring, for example, a thin plate spring made of stainless steel whose both surfaces are polished, and has two fulcrum portions 53 projecting to both sides at one end.
One. The valve backer 540 is made of a flat plate spring, for example, a thin plate spring made of stainless steel whose both surfaces are polished, and has two fulcrum portions 5 projecting to one end side.
41.

The valve seat 520 is made of a thick metal plate, for example, a stainless steel plate. The recess 523 for accommodating the reed valve 530 and the valve backer 340 is formed by cold forging, and both sides are polished. In the discharge port 522, a rib surface is formed in the periphery, a rib-shaped surface portion is polished and finished to form a contact surface of the reed valve 530, and a reed valve of the suction side valve body 510 in a flat portion having no recess 523. The suction port 521 is arranged at a position corresponding to 511.

The gasket 550 includes the valve seat 520 and the substrate 7.
10, a plate made of a resin material, for example, a fiber-containing butyl rubber plate, and a tongue-shaped portion 551 for pressing a fulcrum portion of the reed valve 530 and the valve backer 540 is provided. Is provided. The tongue-shaped portion 551 extends from the surface facing the substrate 710 to the substrate 710.
Is deformed so as to be pushed out by the projection portion 714.

The fluid discharged from the passage hole 711 passes through a muffler portion 720 having a plurality of resonance chambers which resonate with fluid vibrations of different frequencies and muffles, thereby providing a path for discharging from a discharge pipe 730 to form a discharge section 700. ing.

The discharge pipe 730 is connected to the pressure-fluctuation reducing pleat 7
A discharge path is formed by connecting to a discharge pipe 760 provided in the lower container 910 via a discharge relay pipe 750 having 40.

The suction pipe 610 provided in the lower container 910 is connected to the connection suction pipe 620 to form a suction path. Thereafter, the refrigerant fluid filters the contaminants and the like received in the pipe to be used. By passing through the muffler portion 630 provided with a filter to be provided and the resonance chamber portion 640 to reach the suction connection pipe 650 and connecting the suction connection pipe 650 to the connection hole 670 provided in the substrate 710, the suction section 600 is formed. I have.

After assembling the above components, the closed container 90
When the upper container 920 is fitted into the lower container and sealed, as shown in FIGS.
It becomes 0. In this state, the lubricating oil 401 is supplied from the lubricating oil supply plug 460 provided in the lower container 910 to the bottom 4 of the closed container 900.
50 and a diffusion prevention cup 411 provided on the bottom 450.
Is filled with the lubricating oil 401 to the extent that it is immersed.

At the center of the diffusion prevention cup 411, there is a suction port 410 with a tapered hole fitted into the lower end of the motor shaft 230, and the hollow portion of the motor shaft 230 has lubrication holes 420, 430 and the eccentric pin 310. Through the hollow hole 440, a high-speed rotation of the motor shaft 230 causes a vacuum phenomenon due to a vortex at the upper open end of the hollow hole 440, and this vacuum phenomenon causes the lubricating oil 40
The self-lubricating part 400 is configured so that the lubricating oil 1 is sucked up and the lubricating oil 401 is circulated in each part.

FIG. 6 shows a compressor 10 constructed as described above.
FIG. 2 is a diagram showing a refrigeration cycle A constituting a refrigeration apparatus using a compressor 00, a compressor 1000, a condenser C, a decompression device D,
The evaporator E, the dryer F, and the sludge catcher G are connected by piping. Here, the dryer F is formed of a known material, molecular sieves, and the sludge catcher G is formed by binding activated alumina particles with a binder.

The refrigerant sealed in the refrigeration cycle A is a chlorine-free fluorinated hydrocarbon-based refrigerant (HFC).
on), FC (Fluorocarbon)), for example, when R134a is used, the lubricating oil 401 is composed of a compound obtained by polymerizing a divalent or higher valent polyol and a linear or side chain alkyl-based fatty acid without a catalyst. A polyol ester oil having a point of −50 ° C., a two-part separation temperature of −30 ° C., a total acid value of 0.01 mg KOH / g or less, a viscosity of 32 cst at 40 ° C. and a viscosity index of 95 is used.

Examples of the divalent or higher polyol include neopentyl glycol, trimethylolpropane, pentaerythritol and the like. Examples of the linear or side chain alkyl fatty acid include pentanecarboxylic acid, hexanecarboxylic acid, heptanecarboxylic acid, octanecarboxylic acid, neopentanecarboxylic acid, neohexanecarboxylic acid, neoheptanecarboxylic acid, and 2-methylhexanecarboxylic acid. , 2-ethylhexanecarboxylic acid, 3,5,5-
And trimethylhexane carboxylic acid.

The lubricating oil 401 has poor compatibility with a refrigerant such as R134a, but is excellent in abrasion resistance, oxidation stability, electric insulation and the like, and has a kinematic viscosity at 40 ° C. of 36.2 cst.
Or a paraffinic or naphthenic mineral oil or an alkylbenzene oil. Suniso-1GS (trade name) as a mineral oil, and Shrieve 01-150 as an alkylbenzene oil
(Product name) and the like.

When mixed, the polyol ester-based oil must contain at least 10 to 15% by weight, more preferably 20% by weight or more.

In order to prevent oxidative deterioration during long-term storage, this polyol ester oil contains 2,6-
0.3 wt% of a phenolic antioxidant of di-tert-butyl-paracresol (DBPC) is added, and 0.25 wt% for the purpose of preventing hydrolysis.
Epoxy additives are added.

Incidentally, to this polyol ester oil, 5 ppm of a copper deactivator of benzotriazole (BTA) and an extreme pressure additive of 1 wt% of tricresyl phosphate (TCP) are added as required. You.

As the antioxidant, a general compound can be used, and a phenolic antioxidant is particularly preferable. For example, 2,6-di-tert-butyl-paracresol or 2,6 -Di-tert-butyl-phenol, 2,4,6-tri-tert-butyl-phenol and the like can be used.

On the other hand, as the epoxy-based additive, phenyl glycidyl ether, 2-ethylhexyl glycidyl ether, 1,2-epoxycyclohexane and the like can be preferably used.

As the copper deactivator, a benzotriazole compound is preferably used. For example, 5-methyl-1H-benzotriazole, 1-dioctylaminomethylbenzotriazole and the like can be used.

Phosphoric triester compounds are preferably used as extreme pressure additives. For example, in addition to the above-mentioned tricresyl phosphate, triphenyl phosphate, tri-tert-butyl-phenyl-phosphate and the like can be used. Can be used.

R134a sealed in refrigeration cycle A
Has a purity of 99.97 wt% and a chlorine-based refrigerant mixture of 5%.
Adjusted to 6 ppm. Further, the equilibrium moisture (shown by the following formula (I)) in the refrigeration cycle A is 150
It is adjusted to be ppm.

[0057]

(Equation 1)

Further, a dryer F used for the refrigeration cycle A
The water adsorbent has a pore diameter of about 3A. Furthermore, the amount of residual air in the refrigeration cycle A is adjusted to 0.005 wt% of the cycle internal volume.

The amount of residual oxygen in the refrigeration cycle A is
It is adjusted to 0.01 vol% or less of the internal volume of the refrigeration cycle.

The compressor 1000 constituting the refrigeration system
Alkaline benzene hard oil (hereinafter referred to as “HAB”) or ester oil is used for the oil used for processing and assembling processes of components such as oil and condenser C. When HAB is used, the amount of the oil used is reduced. It is controlled so as to be 10% or less of the amount of oil enclosed in the refrigeration cycle A.

The amount of chlorine remaining in the components of the refrigeration system is determined by the amount of oil 18 and R134 filled in the refrigeration cycle A.
(a) It is controlled to be 20 ppm or less based on the total amount of the refrigerant.

That is, 13 enclosed in the refrigeration cycle A
4a The total amount of the chlorine-based refrigerant (CFC, HCFC, etc.) in the refrigerant and the amount of chlorine remaining in the components of the refrigeration system is based on the total amount of the lubricating oil 401 and the refrigerant enclosed in the refrigeration cycle A. Is controlled to be 100 ppm or less.

In the motor section 200 of the compressor 1000, the winding has a two-layer structure in which a layer made of heat-resistant ester (THEIC) or esterimide is provided on the inside and a layer made of amideimide is provided on the outside. An insulating material is coated, and a PET film of low oligomer specification (0.6 wt% or less as trimer) is used as insulating paper for insulating between windings and the like.

Then, the lubricating oil 401 is
Piston 340, which is an iron-based sliding member, and cylinder bore 35
1. Lubricate the sliding surface with the inside. Generally, the compressor 100
The refrigerant oil is discharged from the closed vessel 900 to the condenser C side together with the refrigerant discharged from the discharge pipe 730 of the zero. The lubricating oil flows through the refrigeration cycle A by the refrigerant in a high temperature region where the refrigerant pressure is high. In a low temperature range where the temperature is low, the oil viscosity increases and the fluidity is lost, and the oil tends to stay in the refrigeration cycle A. That is, the lubricating oil tends to remain in the evaporator E. In particular, lubricating oils such as conventional paraffinic or naphthenic mineral oils or alkylbenzene oils, which have poor compatibility with the refrigerant, do not lower the freezing point temperature of the lubricating oil due to the refrigerant, and the oil viscosity further increases in the evaporator E. Liquidity is significantly impaired. For this reason, special R134
By using a polyol ester oil compatible with a refrigerant such as a as a base oil and further mixing a base oil such as a mineral oil or an alkylbenzene oil with the base oil, defects such as hydrolysis of the polyol ester oil can be compensated. Further, by mixing, R134a or the like of the refrigerant dissolves into the mixed oil, thereby lowering the freezing point temperature, suppressing the increase in viscosity, and preventing the fluidity in the evaporator E from being impaired. Has become.

By controlling the content of the polyol ester oil contained in the mineral oil or the alkylbenzene oil to 10 to 50% by weight, the chemical stability of the mixed oil can be prevented from being further impaired.

Next, the piping structure of the present invention will be described with reference to FIGS.

FIG. 7 is a cross-sectional view of a main part of a compressor in which an oil cooler pipe having the pipe structure of the present invention is provided below the lower container 910. FIG. 8 is a cross-sectional view of a main part showing a connection part of the oil cooler pipe. FIG. 9 is a plan view of a piping device, and FIG. 10 is a sectional view of a main part of an oil cooler piping.

Reference numeral 1 denotes a U-shaped oil cooler pipe fixed to the lower part of the lower container 910 of the closed container 900 by resistance welding through the ring-shaped metal fitting 2 so as to penetrate the container. The oil cooler pipe 1 is set at a predetermined position of the closed container 900 from the inside of the closed container 900 in a state where the metal fitting 2 is attached in advance.
Container 200 by resistance welding at electrode 3 applied to
It is fixed to. Reference numeral 4 denotes a rubber stopper attached to the tip of the oil cooler pipe 1.

In the compressor configured as described above, the oil cooler pipe 1 is fixed by the following method as shown in FIGS.

First, the oil cooler pipe 1 is formed into a predetermined U-shape. At this time, straight portions 5 are formed at both ends of the oil cooler pipe 1.

Here, the straight portion 5 has a base tube portion 1A having an outer diameter of 6.5 mm, an expanded portion 1B having an outer diameter of 6.7 mm, and a drawn portion having an outer diameter of 6.5 mm obtained by drawing the expanded portion 1B again. The part 1C is plastically worked.

Next, the annular metal fitting 2 is press-fitted into the expanded portion 1B of the straight portion 5 of the oil cooler pipe 1, and then fixed by welding with copper brazing. On the other hand, holes 6 are formed in two places on the side wall of the lower container 910.

Next, the formed oil cooler pipe 1 is disposed inside the lower container 910, and the straight portions 5 at both ends thereof are inserted into two holes 6 from the inside of the closed container 900.

Finally, the electrode 3 is applied to the metal fitting 2 fixed to the oil cooler pipe 1, and the oil cooler pipe 1 is joined to the periphery of the hole 6 of the lower container 910 by resistance welding.

Therefore, when welding the oil cooler pipe 1, the oil cooler pipe 1 can be fixed to the closed vessel 900 only by welding the metal fitting 2 to the lower vessel 910 by resistance welding, and the welding can be automated. The productivity can be improved by the reduction, and the leak failure at the welded portion can be reduced by eliminating the brazing.

Further, since the fitting 2 is fitted into the expanded portion 1B, a small-diameter pipe such as a discharge pipe can be used as the raw pipe, and the production cost can be reduced by using common components.

Also, the throttle portion 1C of the oil cooler pipe 1
Since the diameter is reduced again, the connection work with the external refrigerant pipe becomes easy.

Further, the use of flux can be abolished with the elimination of brazing (silver brazing of the closed vessel 900 and the oil cooler pipe 1), so that the cleanness of the closed vessel 1 after welding can be greatly improved. The generation of sludge due to contamination or the like is suppressed, and the present invention can be applied to a compressor using an alternative refrigerant or ester oil.

Next, a refrigerant pipe sealing device of the present invention will be described with reference to FIGS.

FIG. 11 shows a refrigeration cycle in the refrigerator R. The refrigerant gas discharged from the compressor 1000 is
The liquefied refrigerant is liquefied, and the liquefied refrigerant is removed of water, dust and the like by a dryer F. The pressure of the liquefied refrigerant is reduced by a pressure reducing device (capillary tube) D, and then evaporated by an evaporator E provided in a refrigerator R. A refrigeration cycle A is formed in which the interior of the refrigerator is cooled by the latent heat and the refrigerant gas evaporated and vaporized is sucked into the compressor 1000.

When the compression section 300 is driven by the electric motor section 200, the compressor 1000 sucks the refrigerant through the suction pipe 610, discharges the compressed and compressed refrigerant from the discharge pipe 730 to the refrigeration cycle A, and circulates it. ing.

Further, the operation of the compressor 1000 causes the lubricating oil 401 accumulated in the bottom 450 of the lower container 910 to be sucked up, and lubricates the movable parts of the electric motor part 200 and the compression part 300. Returning to the bottom 450, some lubricating oil 401 circulates through refrigeration cycle A with the refrigerant. At this time, when Freon R134a is used as the refrigerant, an ester oil having a high water adsorption property is used as the lubricating oil 401.

In the lower container 910 of the compressor 1000, in addition to the refrigerant suction pipe 610 and the refrigerant discharge pipe 730, a refrigerant charging pipe 7 made of, for example, copper for charging the refrigerant is provided so as to protrude. Here, the refrigerant charge pipe 7, the refrigerant suction pipe 610, and the refrigerant discharge pipe 730 are sealed at the end of completing the product by incorporating the compressor 1000 into the refrigerator R or the like. Alternatively, even when the completed compressor 1000 is stored for a long period of time with lubricating oil filled, these pipes 7, 610, and 730 are naturally sealed.

FIG. 12 shows the sealing device according to the present invention,
For example, what is performed on the refrigerant charge pipe 7 is shown. That is, a rubber stopper 9 is fitted into the opening 8 of the refrigerant charge tube 7, and a metal fixing screw 10 is screwed into the stopper 9. The plug 9
Is a plug portion 9a having a length enough to be sufficiently inserted into the refrigerant charge pipe 7.
And a plug head 9b having a diameter larger than the diameter of the refrigerant charge pipe 7. When the fixing screw 10 is screwed into the plug 9, the plug 9 a is expanded from the inside and strongly presses against the inner surface of the refrigerant charge pipe 7. The plug head 9b is connected to the head 10a of the fixing screw 10 by the refrigerant charge pipe 7.
Is strongly pressed so as to securely close the opening 8. In this way, the seal of the refrigerant charge tube 7 is improved and more complete, and the intrusion of moisture from the outside can be reliably prevented.
It is possible to prevent the refrigerant and the lubricating oil from deteriorating due to moisture adsorption, and to suppress the generation of sludge. The same sealing structure may be applied to the refrigerant suction pipe 610 and the refrigerant discharge pipe 730.

When storing the compressor 1000, the water content in the compressor 1000 is reduced to 60 P after 6 months storage.
Although there is a tentative standard for controlling moisture below PM, this standard can be satisfied by the present invention, and the product can be completely stored without deteriorating the quality of the product.

FIG. 13 is a graph showing the measurement of the amount of water absorbed by the sealing device of the present invention and the sealing device of the conventional mode with the passage of days. In the figure, a solid line graph shows a conventional rubber stopper alone, a dashed line graph shows a conventional sealing device in which an iron plug is welded to a refrigerant pipe, and a two-dot chain line graph shows a sealing device of the present invention. The measurement conditions were as follows: an ambient temperature of 60 ° C.
Humidity was 90%.

From this graph, it can be seen that the water content per month in the sealing device of the present invention is １ ／ compared to the conventional specification of the rubber stopper alone.
It will be understood that the sealing performance is improved. After 6 months, it was confirmed that the water content was about 1/4 of the above-mentioned conventional specification.
The above criteria were fully cleared.

[0088]

As described above, according to the present invention, when welding the oil cooler pipe, the oil cooler pipe can be fixed to the closed vessel by simply welding the metal fitting to the closed vessel by resistance welding, and the welding can be automated. By reducing man-hours, productivity can be improved, and by eliminating brazing, it is possible to reduce leakage defects at welded portions. Since the fitting is fitted to the expanded portion, a tube having a small outer diameter such as a discharge tube can be used as the base tube, and the production cost can be reduced by using common components.

Further, since the use of flux can be abolished with the elimination of brazing, the cleanliness in the sealed container after welding can be greatly improved, the generation of sludge due to contamination or the like can be suppressed, and the alternative refrigerant and ester can be removed. Applicable to compressors using oil.

When the compressor is stored after further filling with lubricating oil, the refrigerant pipe provided in the compressor is sealed by screwing a fixing screw.
The plug body is expanded by the plug part and the head of the fixing screw
The two effects of pressing the head against the opening of the tube are obtained
Because of this, the sealing at the opening of the pipe becomes
Water from outside, which causes generation of water and deterioration of refrigerant and lubricating oil
Can be more than prevented. This makes it hygroscopic
Type electric pressure using high ester oil and alternative refrigerant
It is suitable for a compressor , and even if it is mounted on a product after the compressor has been stored for a long period of time, it can provide a user with a highly reliable and high-quality hermetic electric compressor that exhibits a predetermined performance.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an overall configuration of a compressor of the present invention.

FIG. 2 is a partial cross-sectional side view showing the entire configuration of the compressor of the present invention.

FIG. 3 is a top view showing the overall configuration of the compressor of the present invention.

FIG. 4 is an exploded perspective view showing a main part of the compressor of the present invention.

FIG. 5 is an exploded perspective view showing a main part of the compressor of the present invention.

FIG. 6 is a diagram showing a refrigeration cycle including the compressor of the present invention.

FIG. 7 is a sectional view of a main part of a hermetic compressor provided with an oil cooler pipe according to the present invention.

FIG. 8 is a sectional view of a main part showing a connection state of an oil cooler pipe of the present invention.

FIG. 9 is a plan view showing a main part of the oil cooler pipe of the present invention.

FIG. 10 is a sectional view of a main part of the oil cooler pipe of the present invention.

FIG. 11 is a diagram showing a refrigeration cycle of a refrigerator provided with the hermetic electric compressor of the present invention.

FIG. 12 is an enlarged view of a main part when the pipe sealing device of the present invention is used for a refrigerant charge pipe.

FIG. 13 is a graph comparing and measuring the water absorption of the sealing device of the present invention and the conventional sealing device with the passage of days.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 oil cooler pipe 1A raw pipe section 1B expanded pipe section 1C throttle section 2 metal fitting 3 electrode 5 linear section 6 hole 7 refrigerant charge pipe 8 open port 9 stopper 10 fixing screw 200 motor section 300 compression section 401 lubricating oil 610 suction pipe 730 Discharge pipe 900 Closed vessel 1000 Compressor

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shuji Kawashima 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Hiroshi Yamaguchi 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Shigekatsu Kato 2-5-5 Keihanhondori, Moriguchi City, Osaka Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Yasuki Takahashi 2-5, Keihanhondori, Moriguchi City, Osaka Prefecture No. 5 Inside Sanyo Electric Co., Ltd. (56) References JP-A-7-139467 (JP, A) JP-A-61-153092 (JP, A) JP-A-57-19195 (JP, A) JP-A-6-19595 1970 (JP, A) JP-A-6-184575 (JP, A) JP-A-2-298678 (JP, A) JP-A-56-81183 (JP, U) JP-A-58-53881 (JP, U) Japanese Utility Model Showa 54-167410 (JP, U) Japanese Utility Model Showa 50-6381 0 (JP, U) JitsuHiraku flat 5-42684 (JP, U) (58 ) investigated the field (Int.Cl. ^7, DB name) F04B 39/12 101 F04B 39/06

Claims (3)

(57) [Claims] 1. A fluorinated hydrocarbon-based refrigerant containing no chlorine,
Polyol ester oil or polyol ether oil
Lubricating oil based on highly polar oils such as
At the same time, the compression section and the electric motor section
And a refrigerant channel for charging the refrigerant into the closed container.
Charge pipe, suction pipe for sucking refrigerant, discharge for discharging refrigerant
A sealing device for sealing an opening of a pipe such as a pipe is provided,
Fix the oil cooler pipe penetrating this container inside the container
In the sealed hermetic electric compressor, the sealing device is
A plug head larger than the diameter of the pipe and a plug inserted into the pipe
A plug made of an elastic member such as rubber provided with a portion, and the plug
A fixing screw to be screwed into the fixing screw.
With the expansion of the plug portion and the head of the fixing screw,
Seal by pressing the stopper head against the opening of the tube
The oil cooler pipe is connected to the oil cooler
An annular metal fitting fixed to the pipe is resistance welded to the inside of the closed vessel
A hermetic electric compressor fixed at. 2. A fluorinated hydrocarbon refrigerant containing no chlorine,
With encapsulating highly polar oil such as a polyol ester-based oil or polyol ether oil as the base oil was a lubricating oil in a sealed container, accommodating a compression portion and a motor portion in the sealed container, the refrigerant Refrigerant channel charged in a closed container
Charge pipe, suction pipe for sucking refrigerant, discharge for discharging refrigerant
A sealing device for sealing an opening of a pipe such as a pipe is provided,
Fix the oil cooler pipe penetrating this container inside the container
In the sealed hermetic electric compressor, the sealing device is
A plug head larger than the diameter of the pipe and a plug inserted into the pipe
A plug made of an elastic member such as rubber provided with a portion, and the plug
A fixing screw to be screwed into the fixing screw.
With the expansion of the plug portion and the head of the fixing screw,
Seal by pressing the stopper head against the opening of the tube
Then, straight sections are formed at both ends of the oil cooler pipe.
In this straight section, an expanded pipe section and an expanded pipe section
A constriction portion connected to the external pipe is formed at the end of
The pipe is equipped with an annular metal fitting that is press-fitted and brazed to copper.
The two ends of the oil cooler pipe are
Seal the annular fitting with the holes passing through each hole
A hermetic electric compressor fixed inside the container by resistance welding . 3. A fluorinated hydrocarbon refrigerant containing no chlorine,
Polyol ester oil or polyol ether oil
Lubricating oil based on highly polar oils such as
At the same time, the compression section and the electric motor section
And a refrigerant channel for charging the refrigerant into the closed container.
Charge pipe, suction pipe for sucking refrigerant, discharge for discharging refrigerant
Sealed type with a sealing device for sealing the opening of a pipe such as a pipe
In the dynamic compressor, the sealing device has a diameter greater than a diameter of the pipe.
A cap having a large plug head and a plug inserted into the pipe.
A plug made of an elastic member such as a rubber member, and screwed into the plug.
A fixing screw is provided, and the fixing screw is screwed into the fixing screw.
The plug head due to the expansion of the plug portion and the head of the fixing screw
Sealing by pressing the tube against the opening of the tube.
Hermetic electric compressor.