JP3103644B2 - Hermetic 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 compressor used for a refrigerator or an air conditioner.

[0002]

2. Description of the Related Art In recent years, chlorofluorocarbon (hereinafter referred to as C)
Attention has been focused on environmental problems such as ozone layer depletion and global warming caused by the influence of FC. From such a viewpoint, reduction of the amount of CFC used as a refrigerant has become an extremely important theme. Conventionally, fully halogenated carbon compounds that have been used as CFCs contain at least one hydrogen.
Substitution is being attempted with halogenated carbon compounds containing more than one.

[0003] More specifically, dichlorodifluoromethane (hereinafter referred to as CFC12), which is a typical CFC refrigerant, is a halogenated carbon compound containing two hydrogen atoms having little influence on ozone depletion, 1,1,1, A change to 2-tetrafluoroethane (hereinafter referred to as HFC134a) is under consideration.

However, when the HFC 134a is applied, various problems occur. For example, DuPont's Research Disclosure published in October 1978
According to Sure, HFC134a is poorly compatible with any conventional oil, causing two-phase separation in all temperature ranges, and is only soluble in glycol-based oils only. However, glycol-based oils are inferior in electrical insulation, so that it is difficult to apply them to hermetic compressors such as refrigerator compressors having a built-in motor.

[0005] Therefore, studies have been advanced mainly on ester-based oils. For example, in US Pat. No. 4,851,144, a mixture of an ester oil and a glycol oil is
134a. Recent research has found that even an ester-based oil alone can be dissolved in HFC134a, and its application has been studied.
For example, Pude CFC Conference 19
It is reported in the abstracts p190-195 held in July 1990. Further, in order to improve the hydrolysis characteristics, which has been a problem with ester-based oils, a new type of ester-based oil having a carbonate structure such that only carbon dioxide is generated even when hydrolyzed has been proposed.

Here, a conventional refrigerant C will be described with reference to the drawings.
An example of the FC12 compressor will be described. FIG. 3 shows a sectional view of a conventional compressor. 1 is a compressor. Reference numeral 2 denotes a closed casing, 3 denotes a stator shrink-fitted in the closed casing 2, 4 denotes a rotor which forms a motor unit 14 in a pair with the stator 3, and 5 denotes a shaft shrink-fitted to the rotor 4. 6 is a roller incorporated in the eccentric part of the shaft 5, 7 is a cylinder for accommodating the roller 6, and 8 is a shaft 5
Is a main bearing, and 9 is a sub-bearing of the shaft 5, and 10 is a suction pipe press-fitted into the sub-bearing 9 and welded to the closed shell 2.
Reference numeral 11 denotes a charge pipe for charging the refrigerant and the refrigerating machine oil into the compressor 1, and reference numeral 12 denotes a motor unit including the stator 3 and the windings 13. Reference numeral 14 denotes an oil supply pipe for supplying refrigerating machine oil to the sliding surface.

[0007]

A method of charging the compressor 1 with the refrigerant and the refrigerating machine oil for the compressor 1 configured as described above will be described.

When the refrigerating machine oil is already sealed in the compressor 1, only the refrigerant is sealed in the compressor 1 through the charge pipe 11. In this case, the compressor 1 is connected to a system such as a refrigerator by welding or the like, and the compressor 1 and the system are evacuated using a vacuum pump.
Enclose in a more liquid state. However, in this case, the liquid refrigerant sealed in the compressor 1 more vigorously than the charge pipe 11 is applied to the winding 13 of the motor unit 12.

At this time, when the refrigerating machine oil is charged, the refrigerating machine oil adheres to the winding 13 of the motor unit 12, and the refrigerant dissolves in the refrigerating machine oil. In the compressor 1, a predetermined amount of refrigerant is dissolved in lubricating oil, and the rest is present as a gas. At this time, the pressure of the compressor increases, and the refrigerant dissolved in the refrigerating machine oil attached to the windings 13 cannot evaporate.
It is still attached to the winding 13 of the motor unit 12 until it falls under the influence of gravity on the mixed layer of the refrigerating machine oil and the refrigerant on the bottom surface of the compressor 1. At this time, the refrigerant dissolves in the refrigerating machine oil, and a liquid refrigerant having poor electrical insulation exists between the closed casing 2 and the winding 13, so that the electrical insulation of the compressor 1 is significantly reduced.

Further, even when the refrigerating machine oil is not sealed in the compressor 1 in advance, the compressor 1 is connected to a system such as a refrigerator by welding or the like, and the compressor 1 and the system are evacuated using a vacuum pump. After that, the refrigerant and the refrigerating machine oil are simultaneously sealed in the compressor 1 through the charge pipe 11.
Also in this case, similarly, the liquid refrigerant and the refrigerating machine oil which are more strongly sealed in the compressor 1 than the charge pipe 11 are applied to the winding 13 of the motor unit 12 in a mixed state and adhere to the winding 13.
In the compressor 1, a predetermined amount of the refrigerant is dissolved in the refrigerating machine oil, and the rest exists as a gas.

At this time, the pressure of the compressor 1 increases, and the refrigerating machine oil adhering to the windings 13 and the dissolved refrigerant cannot evaporate. The layer is attached to the winding 13 of the motor unit 12 until the layer falls under the influence of gravity. As a result, the refrigerant dissolves in the refrigerating machine oil, and a liquid refrigerant having poor electrical insulation exists between the closed casing 2 and the winding 13, so that the electrical insulation of the compressor 1 is significantly reduced.

That is, when the refrigerant and the refrigerating machine oil are sealed in the compressor 1 through the charge pipe 11, there is a problem that the electrical insulation is erroneously evaluated immediately after the sealing due to the influence of the liquid refrigerant at the time of the sealing.

In the evaluation of the electrical insulation, the mixture of the refrigerating machine oil and the liquid refrigerant adhering to the winding 13 when left overnight is dropped from the winding 13 and collected on the bottom surface of the compressor 1, so that the electrical insulation is restored. Although accurate values can be evaluated, it takes a long time, a place where the refrigerator equipped with the compressor 1 is left is required, and the yield is increased.

Therefore, in the present invention, in view of the above points, the refrigerant,
An object of the present invention is to provide a compressor capable of accurately grasping the electrical insulation of a refrigerating system such as a refrigerator immediately after filling the refrigerating machine oil.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a hermetic compressor according to the present invention uses compressed gas, refrigerants 1, 1,
A sealed casing made of 1,2 tetrafluoroethane and enclosing an ester-based refrigerating machine oil, a machine unit housed in the closed casing, a motor unit for driving the machine unit, and an oil supply for conveying the refrigerating machine oil to the machine unit Device and a charge pipe for charging refrigerant and refrigerating machine oil on the motor side of the closed casing, wherein the charge pipe inserted substantially horizontally into the closed casing is L in the compressor.
The charge pipe has an opening at the tip of the charge pipe facing downward from the compressor.

The charge pipe inserted substantially horizontally into the closed casing is extended by a flexible pipe made of resin or the like in the compressor, and the vicinity of the opening of the pipe is fixed to the side wall of the closed casing.

The opening at the end of the charge pipe, which is inserted substantially horizontally into the closed casing, is cut obliquely so as to face downward from the compressor, and a shield device for refrigerant and refrigerating machine oil is provided at the end of the charge pipe. Provide.

A shield plate is provided between the motor section of the closed casing and the charge pipe by a shield plate mounting component on the inner periphery of the closed casing.

[0019]

According to the present invention, when the refrigerant and the refrigerating machine oil are sealed from the charge pipe of the compressor, the refrigerant and the refrigerating machine oil are prevented from being applied to the windings of the motor section, thereby providing electrical insulation for a refrigerator or the like. The properties can be accurately grasped immediately after charging the refrigerant and the refrigerating machine oil.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the compressor of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 15 is attached to the motor section 12 side of the compressor 16 and is inserted substantially horizontally into the closed casing 2 and is bent into an L-shape in the compressor 1 before the motor section 12. The opening is a charge pipe made of copper, which faces downward of the compressor in front of the motor unit 12.

The charging of the refrigerant and the refrigerating machine oil into the compressor 16 configured as described above will be described. When the refrigerant and the refrigerating machine oil are simultaneously sealed, the compressor 16 is connected to a system such as a refrigerator by welding or the like, and the compressor 16 and the system are evacuated using a vacuum pump. Enclose more. When the refrigerant and the refrigerating machine oil are sealed in the compressor 16, the opening of the charge pipe 15 is directed downward of the compressor 16 in front of the motor unit 14, so that the refrigerant and the refrigerating machine oil are directly supplied to the winding 13 of the motor unit 12. There is no such thing. As a result, since the liquid refrigerant having poor electrical insulation does not collect between the winding 13 and the closed casing 2, electrical insulation immediately after enclosing is ensured, and the electrical insulation can be accurately grasped.

Further, in both cases where the refrigerant is sealed in the compressor 16 in which the refrigerating machine oil is sealed, and in each case when the refrigerating machine oil and the refrigerant are sealed, the opening of the charge pipe 15 is located in front of the motor unit 14 in the compressor. Since it is directed downward, the refrigerating machine oil and the refrigerant do not directly flow to the winding 13 of the motor unit 12. As a result, the liquid refrigerant having poor electrical insulation does not adhere between the winding 13 and the closed casing 2, so that the electrical insulation immediately after enclosing can be secured and the electrical insulation can be accurately grasped. Eliminating the need for a refrigerator storage area to accurately grasp electrical insulation,
The yield is eliminated. Also, when the compressor 16 is operating, the refrigerant accumulated in the compressor 16 at the time of charging is circulated through the system. Sex is not a problem because it does not become smaller than at the time of encapsulation.

Next, a second embodiment will be described with reference to FIG. Reference numeral 17 denotes a copper charge pipe mounted on the motor section 12 side of the compressor 16 and inserted substantially horizontally into the closed casing 2, and a flexible pipe 18 of resin or the like is attached to the tip of the copper charge pipe. The pipe 18 is fixed to the closed casing 2 in the vicinity of the opening by a fixing part 19 so that the opening faces downward of the compressor 16.

The charging of the refrigerant and the refrigerating machine oil into the compressor 16 configured as described above will be described. When the refrigerant and the refrigerating machine oil are simultaneously filled, the compressor 16 is connected to a system such as a refrigerator by welding or the like, and the compressor 16 and the system are evacuated using a vacuum pump. Enclose more. When the refrigerant and the refrigerating machine oil are sealed in the compressor 16, an opening of a flexible pipe 18 such as a resin connected to the charge pipe 17 is fixed to be directed downward of the compressor 16. Since the refrigerating machine oil enters the compressor 16, the refrigerant and the refrigerating machine oil are not directly applied to the winding 13 of the motor unit 12.

Thus, the winding 13 and the closed casing 2
Since the liquid refrigerant having poor electrical insulation does not accumulate in between, the electrical insulation immediately after the filling is ensured, and the electrical insulation can be accurately grasped. Further, the charge pipe 17 is charged regardless of whether the refrigerant is charged into the compressor 16 in which the refrigerant oil is charged or in each case when the refrigerant oil and the refrigerant are charged.
Flexible pipe 18 of resin etc. connected to
The opening of the fixed part 1 is directed downward of the compressor 15.
9 prevents the refrigerating machine oil and the refrigerant from being directly applied to the winding 13 of the motor unit 12.

Thus, the winding 13 and the closed casing 2
Since the liquid refrigerant having poor electrical insulation does not accumulate in between, the electrical insulation immediately after the filling is ensured, and the electrical insulation can be accurately grasped. In addition, since the enclosed refrigerant and refrigerating machine oil are discharged into the compressor 16 near the bottom surface of the compressor 16, the refrigerant and refrigerating machine oil do not scatter on the inner wall of the compressor 16 or the like. Since it is possible to more accurately grasp the electric insulation, it is not necessary to leave a place for leaving the refrigerator for accurately grasping the electrical insulation, and the yield is reduced.

Further, in the first embodiment, if the charge pipe 15 is to be sealed under the compressor 16, it is necessary to lengthen the vertical portion of the L shape of the charge pipe 15, and the terminal becomes an obstacle. Although it is necessary to increase the distance between the motor section 12 and the attachment section of the charge pipe 15, in this embodiment, since the flexible pipe 18 made of resin is connected to the tip of the charge pipe 17, the opening of the pipe 18 Can be fixed to the lower side of the compressor 16, avoiding the terminal of the compressor 16,
Refrigerant and refrigerating machine oil can be sealed under the compressor 16 in a state where the attachment portion between the motor unit 12 and the charge pipe 17 is shortened, so that the refrigerant and the refrigerating machine oil are not directly applied to the winding 13.

Also, during operation of the compressor 16, the refrigerant accumulated in the compressor 16 at the time of charging is circulated through the system. On the other hand, the electrical insulation does not become a problem because it does not become smaller than that at the time of the sealing.

Next, a third embodiment will be described with reference to FIG. Reference numeral 20 denotes a charge which is attached to the motor section 12 side of the compressor 16 and is inserted substantially horizontally into the closed casing 2 and is cut obliquely so that the opening at the tip inside the compressor 16 faces downward of the compressor. A pipe 21 is a shielding device for refrigerant and refrigerating machine oil attached to the tip of the charge pipe, and these are located between the motor unit 12 and the closed casing 2.

The charging of the refrigerant and the refrigerating machine lubricating oil into the compressor 16 configured as described above will be described. Refrigerant,
When the refrigerating machine oil and lubricating oil are simultaneously filled, the compressor 16 is connected to a system such as a refrigerator by welding or the like, and the compressor 16 and the system are evacuated using a vacuum pump. Enclose more. Refrigerant,
When the refrigerating machine oil is sealed in the compressor 16, the opening at the tip of the charge pipe 20 is cut obliquely so as to face downward of the compressor 16, and the coolant and the refrigerating machine oil are sealed at the tip of the charge pipe 20. At times, a shielding device 21 for preventing the refrigerant and the refrigerating machine oil from being applied to the motor unit 12 is attached.

Accordingly, when the refrigerant and the refrigerating machine oil are charged, the opening at the tip of the charge pipe 20 is
6, the refrigerant and the refrigerating machine oil are more easily dropped from the charge pipe 20 to the lower part of the compressor 16 than the charge pipe whose tip is not cut. The amount of such refrigerant and refrigerating machine oil is reduced.

At the end of the opening of the charge pipe 20, a shielding device 21 for preventing the refrigerant and the refrigerating machine oil from being applied to the motor section 12 is attached, so that the refrigerant and the refrigerating machine oil are applied to the motor section 12 by this effect. Can be completely shut off. Thereby, since the liquid refrigerant having poor electrical insulation does not accumulate between the winding 13 and the closed casing 2, the electrical insulation immediately after the sealing is ensured, and the electrical insulation can be accurately grasped.

In addition, in the case where the refrigerant is sealed in the compressor 16 in which the refrigerating machine oil is sealed, the opening at the tip of the charge pipe 20 is located below the compressor 16 both in the case where the refrigerating machine oil and the refrigerant are sealed. Since the refrigerant and the refrigerating machine oil are cut obliquely so as to face each other, the charge pipe 20 is more likely to fall below the compressor 16 in the charge pipe 20 than the charge pipe whose tip is not cut when the refrigerant and the refrigerating machine oil are filled in the compressor 16. Refrigerant to be applied to the motor unit 12,
The amount of refrigerating machine oil is reduced.

In addition, a shielding device 21 for preventing the refrigerant and the refrigerating machine oil from being applied to the motor unit 12 is attached to the end of the opening of the charge pipe 20, so that each of the refrigerating machine and the refrigerating machine oil is provided by this effect. It is possible to completely cut off the motor portion 14. This allows
Since liquid refrigerant having poor electrical insulation does not accumulate between the winding 13 and the closed casing 2, electrical insulation immediately after enclosing can be ensured, and the electrical insulation can be accurately grasped.
This eliminates the necessity for a place where the refrigerator is left for accurately grasping the electrical insulation, thereby eliminating the yield. Further, the tip of the charge pipe 20 is obliquely cut, and L
Since it is not processed into a letter, the pressure loss at the time of charging the refrigerant and the refrigerating machine oil is small, and the charging is easy.

Also, during operation of the compressor 16, the refrigerant accumulated in the compressor 16 at the time of charging is circulated through the system. On the other hand, the electrical insulation does not become a problem because it does not become smaller than that at the time of the sealing.

Next, a fourth embodiment will be described with reference to FIG. Reference numeral 22 denotes a shield plate made of a heat-resistant resin or the like attached between the motor unit 12 side of the compressor 16 and the charge pipe 11 along the inner periphery of the closed casing 2 by a shield plate attachment part 23. The shield plate 22 is cut below the compressor 16 so that the refrigerant and refrigerating machine oil stored in the compressor 16 can move freely between the motor unit 12 and the charge pipe 11. I have.

The charging of the refrigerant and the refrigerating machine oil into the compressor 16 configured as described above will be described. When the refrigerant and the refrigerating machine oil are simultaneously filled, the compressor 16 is connected to a system such as a refrigerator by welding or the like, and the compressor 16 and the system are evacuated using a vacuum pump. Enclose more. When the refrigerant and the refrigerating machine lubricating oil are sealed in the compressor 16, the refrigerant and the refrigerating machine oil discharged from the charge pipe 11 collide with the shielding plate 23, travel down the shielding plate 22, and fall on the bottom surface of the compressor 16.

Thus, it is possible to completely prevent the refrigerant and the refrigerating machine oil from being applied to the motor section 12. That is, since the liquid refrigerant having poor electrical insulation does not accumulate between the winding 13 and the closed casing 2, the electrical insulation immediately after the sealing is secured, and the electrical insulation can be accurately grasped.

In addition, when the refrigerant is sealed in the compressor 16 in which the refrigerating machine oil is sealed, the shielding plate 22 is connected to the refrigerating machine, the refrigerating machine oil discharged from the charge pipe 11 regardless of whether the refrigerating machine oil or the refrigerant is sealed. Since it collides with the shielding plate 22 and travels down the shielding plate 22 and falls to the bottom of the compressor 16, it is possible to completely block the refrigerant and the refrigerating machine oil from directly flowing to the motor unit 12.

Thus, the winding 13 and the closed casing 2
Since the liquid refrigerant having poor electrical insulation does not accumulate in between, the electrical insulation immediately after the filling is ensured, and the electrical insulation can be accurately grasped. Further, since the shielding plate 22 is attached along the inner periphery of the sealed casing 2 between the motor section 12 side of the compressor 16 and the charge pipe 11, the enclosing section is separated from the motor section 12 and the refrigerating machine oil In addition, the refrigerant hardly scatters to the motor unit 12 and the refrigerant and the refrigerating machine oil sealed in the compressor 16 by the shielding plate 22 do not splash on the rebound winding 13 from the liquid level, so that the electrical insulation is improved. In addition to being the best compared with the first to third embodiments, the charge pipe 11 is formed into an L-shape, so that the pressure loss at the time of sealing can be reduced and sealing can be easily performed.

This eliminates the necessity for a place where the refrigerator is left for accurately grasping the electrical insulation, thereby eliminating the yield. In addition, during operation of the compressor 16, the refrigerant accumulated in the compressor 16 at the time of sealing is circulated through the system. The insulating property is not a problem because it does not become smaller than at the time of sealing.

[0043]

As described above, according to the present embodiment, the gas to be compressed is the refrigerant 1, 1, 1, 2 tetrafluoroethane, and the sealed casing in which the ester-based refrigerating machine oil is sealed, and which is stored in the sealed casing. A mechanical unit, a motor unit for driving the mechanical unit, an oil supply device for transporting refrigerating machine oil to the mechanical unit, and a charge pipe for enclosing refrigerant and refrigerating machine oil on the motor unit side of the closed casing. The charge pipe inserted substantially horizontally therein is L-shaped in the compressor, and the opening at the tip of the charge pipe faces downward of the compressor.

The charge pipe inserted substantially horizontally into the closed casing is L-shaped in the compressor, and the opening at the tip of the charge pipe extends to near the bottom of the compressor. In the vicinity, it is fixed to the closed casing side wall.

The opening at the end of the charge pipe inserted substantially horizontally into the closed casing is obliquely cut so as to face downward of the compressor, and the end of the charge pipe is shielded from refrigerant and refrigerating machine oil. A device is provided.

Further, a shield plate is provided on the inner periphery of the closed casing between the motor of the closed casing and the charge pipe, and the shield plate mounting part is provided. Since refrigerant and refrigerating machine oil are not directly applied to the motor part, liquid refrigerant with poor electrical insulation does not accumulate between the winding and the sealed casing, ensuring electrical insulation immediately after enclosing and ensuring accurate electrical insulation. The effect that can be grasped is obtained.

This eliminates the necessity for a place where the refrigerator is left for accurately grasping the electrical insulation, thereby eliminating the yield. In addition, during operation of the compressor, the refrigerant accumulated in the compressor at the time of charging circulates through the system, so even if a mixture of refrigerant and refrigerating machine oil is applied to the windings during operation, electrical insulation is sealed. It doesn't matter because it doesn't get smaller than time.

[Brief description of the drawings]

FIG. 1 is a sectional view of a compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a compressor according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a compressor according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a compressor according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional compressor.

[Explanation of symbols]

2 Closed casing 11, 15, 17, 20 Charge pipe 12 Motor unit 16 Closed compressor 18 Flexible pipe made of resin or the like 21 Shielding device 22 Shielding plate 23 Shielding plate attaching part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F04B 39/12 F04C 23/00-29/10 331 F25B 45/00

Claims (4)

(57) [Claims] 1. A closed casing in which a gas to be compressed is refrigerant 1, 1, 1, 2 tetrafluoroethane and an ester-based refrigerating machine oil is enclosed, a mechanical unit housed in the closed casing, and the mechanical unit are driven. A motor unit, an oil supply device that conveys refrigerating machine oil to the mechanical unit, and a charge pipe that encloses refrigerant and refrigerating machine oil on the motor unit side of the closed casing , wherein the charge pipe is substantially enclosed in the closed casing. Inserted horizontally, L
And the opening at the tip of the charge pipe is
A hermetic compressor characterized by being directed downward from the compressor. 2. A closed casing in which a gas to be compressed is refrigerant 1, 1, 1, 2 tetrafluoroethane and in which an ester-based refrigerating machine oil is enclosed, a mechanical unit housed in the closed casing, and the mechanical unit are driven. A motor unit, an oil supply device that conveys refrigerating machine oil to the mechanical unit, and a charge pipe that encloses refrigerant and refrigerating machine oil on the motor unit side of the closed casing , wherein the charge pipe is substantially enclosed in the closed casing. It is inserted horizontally and in the compressor
It is extended by a flexible pipe such as fat, and
Close the opening of the resin pipe or the like with the closed casing.
A hermetic compressor characterized by being fixed to the side wall . 3. A closed casing in which the compressed gas is refrigerant 1, 1, 1, 2 tetrafluoroethane and in which an ester-based refrigerating machine oil is sealed, a mechanical section housed in the closed casing, and the mechanical section are driven. A motor unit, an oil supply device that conveys refrigerating machine oil to the mechanical unit, and a charge pipe that encloses refrigerant and refrigerating machine oil on the motor unit side of the closed casing , wherein the charge pipe is substantially enclosed in the closed casing. It is inserted horizontally and the opening at the tip is
It is cut diagonally so that it faces downward from the compressor, and
A shield device for refrigerant and refrigerating machine oil
A hermetic compressor characterized by being attached . 4. A closed casing in which the compressed gas is refrigerant 1, 1, 1, 2 tetrafluoroethane and in which an ester-based refrigerating machine oil is sealed, a mechanical unit housed in the closed casing, and the mechanical unit are driven. A motor unit, an oil supply device that conveys refrigerating machine oil to the mechanical unit, and a charge pipe that encloses refrigerant and refrigerating machine oil on the motor unit side of the closed casing , wherein the motor unit and the char
A shield plate is attached between the pipes on the inner periphery of the closed casing.
A hermetic compressor wherein a shielding plate is provided by a sealing part .