JPH09210514A - Compressor for refrigerator air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hardly cause the occurrence of choking of a capillary tube, a motor-driven expansion valve, and a filter, in a refrigerator air-conditioner to use ester oil as a refrigerator oil. SOLUTION: A compressor for refrigerator air-conditioner has a compressor body part at which a refrigerant delivery part to deliver a refrigerant, a refrigerant suction part to suck a refrigerant, a refrigerant delivery part, and a refrigerant suction part are respectively fixed. In case of a compressor grounding surface 14 being a bottom, a delivery port 11 of a refrigerant delivery part and a suction port 12 of a refrigerant suction part are fixed in such a manner to be positioned above an upper end 15 of the compressor body part. The interior of the compressor body part is sealed with dry gas having specific gravity higher than that of the atmosphere.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor for a refrigeration air conditioner.

[0002]

2. Description of the Related Art Conventionally, water and oxygen in a system have been regarded as a major enemy for a refrigerating air conditioning system for a refrigerating air conditioner such as a room air conditioner, a package air conditioner, a refrigerator, etc. For this, dry air or nitrogen gas was used to reduce the effects of moisture and oxygen.

On the other hand, as a refrigerant for a refrigerating air conditioner,
HCFC-based or CFC-based refrigerants such as monochlorodifluoromethane (R22) have been widely used as refrigerating machine oils because of their good compatibility with the refrigerants, naphthene-based or paraffin-based mineral oils and alkylbenzene-based oils.

However, these HCFC-based and CFC-based refrigerants are being regulated because they are substances that cause ozone layer depletion. Instead of these, fluoroalkane-based refrigerants such as R410A and R407C, R134
Refrigerants such as A have been studied or used as alternative refrigerants.

Fluorinated alkane type refrigerants having no chlorine atom in the molecule have poor compatibility with conventional refrigerating machine oils such as mineral oil type and alkylbenzene type, and are used together with ester oil refrigerating machine oils having good compatibility. It is necessary.

[0006]

However, when dry air or nitrogen gas is used as the internal gas at the time of shipment of the compressor for the refrigerating and air-conditioning apparatus as in the prior art, there are the following problems.

In the refrigeration / air-conditioner manufacturing process, there is a process in which the compressor discharge port and the suction port are opened. At this time, the specific gravity of the air and nitrogen enclosed in the compressor is about the same as the atmosphere. , Replaces the atmosphere at a relatively large rate. Therefore, when the opening time becomes long, or when the atmospheric temperature and humidity at the time of opening are high, a large amount of atmospheric moisture and oxygen intrude into the compressor. Then, the invading water is absorbed in the refrigerating machine oil and the motor organic material in the compressor, and the oxygen is absorbed in the refrigerating machine oil to some extent. The absorbed water and oxygen remain to some extent even after a dehydration process such as evacuation after attaching the compressor to the refrigeration air conditioner body.

The residual water and oxygen, together with other system residual water and system residual oxygen, cause oxidation of refrigerating machine oil during operation or stop of the refrigerating air conditioner. The resulting oxides generate sludge in the system,
With the operation of the refrigerating and air-conditioning system, there arises a problem that the capillaries in the refrigerating and air-conditioning system, the electric expansion valve, the filters attached to the oil pump of the compressor, etc. are clogged.

On the other hand, the ester refrigerating machine oil has a higher water absorption than conventional mineral oils and alkylbenzene type refrigerating machine oils, and in addition, the presence of water causes an ester compound constituting the oil to undergo a hydrolysis reaction to produce an organic acid. There is a property.

Therefore, when ester oil is used as the refrigerating machine oil and dry air or nitrogen gas is used as the internal gas at the time of shipment of the compressor for the refrigerating and air-conditioning apparatus as in the prior art,
In addition to the above problems, the following problems occur.

At the time of opening the compressor discharge port and the suction port in the refrigerating and air-conditioning machine manufacturing process, moisture in the atmosphere that enters the compressor is mixed with ester oil and motor organic material in the compressor, and after being attached to the refrigerating and air-conditioning unit main body. It remains to a considerable extent even after a dehydration process such as evacuation. Residual water, along with other system residual water, causes hydrolysis of ester refrigerating machine oil when the refrigeration air conditioner is operating or stopped, and the organic acid generated by this causes iron in the system such as sliding parts in the compressor. Corroded,
The generated organic acid iron salt causes a problem that the capillary tube, the electric expansion valve, and the filters in the refrigeration and air conditioning system are clogged as sludge as the refrigeration and air conditioning machine operates.

The present invention is to solve the above-mentioned conventional problems. In a refrigerating air conditioner using ester oil as refrigerating machine oil, the refrigerating air conditioner in which the capillary tube, the electric expansion valve, and the filter are less likely to be clogged than in the conventional case. An object is to provide a compressor for a machine.

[0013]

The present invention according to a first aspect of the present invention is a compressor for a refrigerating and air-conditioning apparatus, in which a dry gas having a specific gravity larger than that of the atmosphere is enclosed.

According to a second aspect of the present invention, a refrigerant discharge part for sending out a refrigerant, a refrigerant suction part for sucking the refrigerant, and a compressor body part to which the refrigerant discharge part and the refrigerant suction part are attached respectively. All or a part of the refrigerant discharge part and / or the refrigerant suction part is substantially above a portion attached to the compressor body, and the inside of the compressor body has an atmosphere. This is a compressor for a refrigerating and air conditioning machine in which a dry gas having a larger specific gravity is enclosed.

According to a third aspect of the present invention, the discharge port of the refrigerant discharge unit and / or the suction port of the refrigerant suction unit is provided on the side of the compressor body opposite to the grounding surface of the compressor body. The compressor for a refrigerating and air-conditioning apparatus is located substantially above the upper surface.

A fourth aspect of the present invention is a compressor for a refrigerating and air-conditioning apparatus, wherein the dry gas is a gas containing at least argon gas or carbon dioxide gas.

The present invention according to claim 5 is a compressor for a refrigerating and air-conditioning machine, which uses an ester oil as a refrigerating machine oil.

According to the first aspect of the present invention, a dry gas having a larger specific gravity than the atmosphere is enclosed inside the compressor for the refrigerating and air conditioning system.

According to the above-mentioned structure, for example, in the step of opening the compressor discharge port and the suction port at the time of manufacturing the refrigerating air conditioner, the dry gas enclosed in the compressor has a specific gravity larger than that of the atmosphere. The gas enclosed inside the compressor below the opening of the compressor is difficult to replace with the atmosphere. Therefore, moisture in the atmosphere and oxygen in the atmosphere are less likely to enter the compressor, and the amount of water and oxygen remaining in the refrigerating air conditioner body to which the compressor is attached are reduced. Therefore, in the manufactured refrigerating and air-conditioning machine, sludge formation of refrigerating machine oil can be suppressed to be low, and clogging of the capillary tube, the electric expansion valve, and the filter can be prevented.

According to the second aspect of the present invention, the refrigerant discharge part sends out the refrigerant, the refrigerant suction part sucks the refrigerant, and the compressor body part attaches the refrigerant discharge part and the refrigerant suction part, respectively, All or a part of the discharge part and / or the refrigerant suction part is substantially above the part attached to the compressor body, and the inside of the compressor body has a larger specific gravity than the atmosphere. Gas is enclosed.

As a result, since the specific gravity of the enclosed gas is larger than that of the atmosphere, it is difficult for the gas enclosed in the compressor to be replaced with the atmosphere.

According to a third aspect of the present invention, a discharge port of the refrigerant discharge part and / or a suction port of the refrigerant suction part of the compressor body part opposite to the ground surface of the compressor body part are provided. Located substantially above the top surface.

Thus, of the compressors for a refrigerating and air-conditioning machine of the present invention, for example, when the compressor is installed in the refrigerating and air-conditioning machine with its bottom surface facing downward, the refrigerant discharge port or the refrigerant suction port is the compressor. According to a preferred aspect characterized in that it is located above the upper end of the main body, with regard to the compressor opening located above the upper end of the compressor main body, all the gas enclosed in the compressor is the compressor. Since it is located below the opening and the specific gravity of the enclosed gas is larger than that of the atmosphere, the gas enclosed inside the compressor is less likely to be replaced with the atmosphere. Therefore, moisture in the atmosphere and oxygen in the atmosphere are less likely to enter the compressor,
The amount of water remaining in the refrigeration air conditioner equipped with a compressor,
The amount of oxygen will be further reduced. Therefore, in the manufactured refrigerating and air-conditioning machine, it is possible to suppress the sludge formation of the refrigerating machine oil to be low and to easily prevent clogging of the capillary tube, the electric expansion valve, and the filter.

In the present invention of claim 4, the dry gas is
It is a gas containing at least argon gas or carbon dioxide gas.

Thus, according to a preferred embodiment of the compressor for a refrigerating and air-conditioning apparatus of the present invention, for example, the dry gas sealed inside is a gas containing argon gas or carbon dioxide gas as a main component. By using readily available argon gas or carbon dioxide gas as the main component, it is possible to more easily provide a refrigerating air conditioner in which the capillary tube, the electric expansion valve, and the filter are not clogged.

In the present invention of claim 5, ester oil is used as the refrigerating machine oil.

As a result, the amount of water and oxygen remaining in the refrigerating air conditioner is reduced, and in the manufactured refrigerating air conditioner, in addition to sludge due to oxidation of refrigerating machine oil, sludge due to hydrolysis is also suppressed. Therefore, the possibility that the capillary tube, the electric expansion valve, and the filter are clogged can be greatly reduced.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.

Examples of the compressor for a refrigerating and air-conditioning machine according to the present invention include scroll type compressors, rotary type compressors, reciprocating type compressors, etc., and both types may be either vertical type or horizontal type. .

Examples of the refrigerating air conditioner using the compressor for a refrigerating air conditioner according to the present invention include room air conditioners, package air conditioners, car air conditioners, refrigerators and the like.

Examples of the refrigerating machine oil in the present invention include mineral oil, alkylbenzene oil, ester oil and ether oil.

The dry gas in the present invention includes, for example, a gas having a water content of 4 wt ppm or less, and the types thereof include, for example, argon gas, carbon dioxide gas, a mixed gas thereof, each of the above three kinds of gas and dry nitrogen. Examples of the mixed gas include gas and dry helium gas.

In the present invention, a pipe-shaped refrigerant discharge portion for sending out the refrigerant and a pipe-shaped refrigerant suction portion for sucking the refrigerant are provided with a compressor main body portion fixed to each other, and the refrigerant discharge portion When the discharge port and / or the suction port of the refrigerant suction section has the compressor grounding surface as the bottom surface, as a refrigerating and air-conditioning compressor fixed so as to be located above the upper end of the compressor body section, Examples thereof include those shown in FIGS. 1 and 2. FIG. 1 shows a case where both the discharge port 11 of the refrigerant discharge unit and the suction port 12 of the refrigerant suction unit are located above the upper end 15 of the compressor body. Further, FIG. 2 shows a case where only the discharge port 21 of the refrigerant discharge portion is located above the upper end 25 of the compressor main body portion.

The compressor body in the present invention means a part of the compressor other than the refrigerant discharge part and the refrigerant suction part.

The compressor grounding surface in the present invention means the surface on the compressor side which is in contact with the grounding surface when the compressor is installed.

Examples of the ester oil according to the embodiment of the present invention include oils having a base oil such as a polyol ester, a dibasic acid ester, a complex ester and a polyol carbonic acid ester.

Of these, as the polyol ester,
An ester of a diol or a polyol having 3 to 20 hydroxyl groups and a fatty acid having 6 to 20 carbon atoms is preferably used.

As the diol, those having 2 to 12 carbon atoms are preferable, and specific examples thereof include ethylene glycol, 1,3-propanediol, propylene glycol, and 1,4-butanedio-. 1,2-butanediol, 2-methyl-1,3-propanediol, 1,
5-pentaneddiol, neopentyl glycol, 1,
6-hexanediol, 2-ethyl-2-methyl-1,
3-propanediol, 1,7-heptanediol, 2
-Methyl-2-propyl-1,3-propanediol,
2,2-diethyl-1,3-propanediol, 1,8
-Octanediol, 1,9-nonanediol, 1,1
0-decanediol, 1,11-undecandiol,
1,12-dodecanediol and the like.

The polyol preferably has 3 to 60 carbon atoms, and specific examples thereof include trimethylolethane, trimethylolpropane, trimethylolbutane, di- (trimethylolpropane), and tri- (trimethylolpropane). ), Pentaerythritol, di- (pentaerythritol), tri- (pentaerythritol)
), Glycerin, polyglycerin (2- to 2-glycerin)
20-mer), 1,3,5-pentantriol, sorbitol, sorbitan, sorbitol-glycerin condensate,
Polyhydric alcohols such as adonitol, arabitol, xylitol, mannitol, xylol, arabinose, ribose, rhamnose, glycose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, sucrose , Raffinose, gentianose, melezitose and the like, and partial ether compounds thereof, methyl glycoside (glycoside) and the like.

Specific examples of the fatty acid include hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecane. Examples thereof include straight-chain or branched acids such as acids, nonadecanoic acid, eicosanoic acid, and oleic acid, and so-called neo acids having a quaternary α carbon atom.

The polyol ester may have a free hydroxyl group. Incidentally, particularly preferred polyol esters are neopentyl glycol, trimethylolethane, trimethylolpropane, trimethylolbutane,
Esters of hindered alcohols such as di- (trimethylolpropane), tri- (trimethylolpropane), pentaerythritol, di- (pentaerythritol) and tri- (pentaerythritol). . Specific examples include trimethylolpropane caprylate, trimethylolpropane argonate, pentaerythritol hexanoate, pentaerythritol 2-ethylhexanoate, pentaerythritol 3,5,5-trimethylhexanoate, Pentaerythritol pelargonate and the like.

As the dibasic acid ester, glutaric acid,
Adipic acid, pimelic acid, suberic acid, azelaic acid,
C5-10 dibasic acids such as sebacic acid and methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, etc. C 1 having a linear or branched alkyl group of
Esters with a monohydric alcohol of from 15 to 15 are preferably used. Specific examples include ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, and di-3-ethylhexyl sebacate.

The complex ester is a mixture of esters of fatty acid or dibasic acid and monohydric alcohol or polyol, and the mixing ratio thereof is not particularly limited. As fatty acids, dibasic acids, monohydric alcohols and polyols, those similar to those exemplified for the polyol ester and the dibasic ester can be used.

The polyol carbonic acid ester is an ester of carbonic acid and polyol. As the polyol, it is possible to use polyglycol obtained by homopolymerizing or copolymerizing polyol, or one obtained by adding polyglycol to the above-exemplified polyol.

[0045]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of the present invention will be described below.

(Embodiment 1) A compressor as shown in FIGS. 3 and 4 (compressor A and compressor B, respectively) is constructed,
Nitrogen gas having almost the same specific gravity as the atmosphere, argon gas having a higher specific gravity than the atmosphere, carbon dioxide gas, a mixed gas of argon gas and nitrogen gas (molar ratio 1: 1) (water content is 2 wt ppm for all gases) We evaluated the reduction of water content and oxygen content in the refrigerating machine oil by encapsulating. still,
The compressors A and B have the same shape and size except for the sizes and shapes of the refrigerant suction portion and the refrigerant discharge portion.

As shown in FIG. 3, the discharge port 3 of the compressor A
1. When the compressor grounding surface 34 is the bottom surface, the first suction port 32 and the refrigerant suction port are located below the upper end 35 of the compressor body. Further, as shown in FIG. 4, the discharge 41 and the suction port 42 of the compressor B are located above the upper end 45 of the compressor body when the compressor grounding surface 44 is the bottom surface. Located in.

A septum made of silicone rubber is attached to the oil sampling ports 36 and 46, and an injection needle having an inner diameter of 2 mm is inserted into the septum, and oil is sampled through the injection needle. By using this septum, it is possible to collect a refrigerator oil sample for water content measurement with a syringe without exposing the interior of the compressor to the atmosphere, and prevent measurement errors due to water contamination in the atmosphere during sample collection. did it. It was also possible to reduce the pressure inside the compressor before introducing the gas.

First, the inside of a sufficiently dried compressor was evacuated, and a predetermined amount (260 ml) of ester oil was charged while maintaining a reduced pressure state, and then gas was charged. The compressor in that state was opened in the atmosphere of 30 ° C. and 80% RH with the discharge port and suction port left for 65 hours, and the moisture content in oil and the dissolved oxygen concentration in oil after the standing were measured. Especially with respect to the water content, the change over time was also measured. As the measuring method, the Karl Fischer coulometric titration method was used for the water content, and the gas chromatography method was used for the dissolved oxygen concentration. The results for the water content in oil are shown in (Table 1), and the results for the oxygen concentration in oil are shown in (Table 2). The oxygen concentration is converted into a value at 20 ° C. under 1 atmosphere. The results of time-dependent changes in water content in oil are shown in FIGS. 5 and 6.
Further, regarding dissolved oxygen, the same evaluation was performed using a refrigerating machine oil as an alkylbenzene-mineral oil mixed oil. The results are shown in (Table 3).

[0050]

[Table 1]

[0051]

[Table 2]

[0052]

[Table 3]

As shown in FIGS. 5 and 6, the oil in the compressor filled with argon gas, carbon dioxide gas, or nitrogen-argon mixed gas, which has a larger specific gravity than the atmosphere, produces nitrogen having a specific gravity almost equal to that of the atmosphere. It became clear that moisture and oxygen are less likely to be absorbed when the air in the discharge suction port is released to the atmosphere than the oil in the enclosed compressor.

Further, in the case where the discharge port and the suction port have the compressor grounding surface as the bottom face, the case where the discharge port and the suction port are located above the upper end of the compressor main body is more likely to be It was also revealed that absorption of moisture and oxygen in the oil inside the compressor is unlikely to occur.

Example 2 A refrigerating air conditioner as shown in FIG. 7 was constructed and operated to evaluate the clogging of the capillary tube. As the capillary tube 53, one having a diameter of 1.4 mm and a length of 1000 mm was used, R407C was used as the refrigerant, mixed oil of hard alkylbenzene oil and mineral oil was used as the refrigerating machine oil, and polyol ester oil was used.
Then, as the compressor 51, the same compressor as that of the first embodiment without an oil sampling pipe was used. Example 1
And the compressors A and B respectively correspond to compressors C and
D. For compressors C and D, nitrogen gas,
Three types of compressors (total 6 types) were prepared in which argon gas, carbon dioxide gas, a mixed gas of nitrogen gas and argon gas (molar ratio 1: 1) (moisture content was 2 wt ppm for all gases) were enclosed, In each case, the discharge port and the suction port were opened in an atmosphere of 30 ° C. and 80% RH and left for 65 hours, and then a refrigerating air conditioner was constructed. When the compressor C is used and nitrogen, argon, carbon dioxide gas, or a nitrogen-argon mixed gas is used as the compressor enclosed gas, the refrigerating air conditioner NO. 1, NO. 2, NO.
3, NO. And 4. When the compressor D is used and nitrogen, argon, carbon dioxide gas, or a nitrogen-argon mixed gas is used as the compressor enclosed gas, the refrigerating air conditioner NO. 5,
NO. 6, NO. 7, NO. And 8. The refrigerant was charged after these gases were extracted by vacuuming.

Then, the ventilation of the condenser 52 was obstructed, and the amount of the refrigerant was reduced from the specified amount, so that the discharge temperature of the compressor was set to about 120 ° C. and the operation was performed for 4000 hours. Furthermore, the same evaluation was performed when R22 was used as the refrigerant and hard alkylbenzene was used as the refrigerating machine oil.

The ratio of the flow rate of the capillary tube after the operation to that before the operation is shown in (Table 4) in the case of R407C-polyol ester oil and in (Table 5) in the case of the mixed oil of R22-hard alkylbenzene and mineral oil. . In any case, when the enclosed gas is nitrogen whose specific gravity is about the same as the atmosphere, argon, carbon dioxide gas, which has a larger specific gravity than the atmosphere,
It is considered that the decrease in the flow rate of the capillary tube was larger than in the case of the nitrogen-argon mixed gas, more sludge was generated, and the degree of clogging was also larger. Also, when the discharge port and the suction port have the compressor grounding surface as the bottom surface,
It is considered that in the case of the compressor located above the upper end of the compressor body, the decrease in the flow rate of the capillary tube was smaller and the degree of sludge generation and clogging was smaller than in the case where it was not.

[0058]

[Table 4]

[0059]

[Table 5]

As described above, in a compressor for a refrigeration air conditioner, when the gas enclosed in the compressor is argon or the like having a larger specific gravity than the atmosphere, the capillary is clogged more than in the case of nitrogen having a specific gravity almost equal to that of the atmosphere. It became clear that the phenomenon could be suppressed.

In the above embodiment and the like, at least one of the discharge port of the refrigerant discharge unit and the suction port of the refrigerant suction unit is the upper surface of the compressor body section opposite to the grounding surface of the compressor body section. Although the case where it is located substantially above, etc. has been described, the present invention is not limited to this, and for example, all or part of the refrigerant discharge part and / or the refrigerant suction part is substantially larger than the part attached to the compressor body part. The structure above may be sufficient. In this case, for example, as long as a part of the pipe of the refrigerant discharge part has a shape (for example, a trap shape) that is once lifted to a position above the compressor main body part and the mounting part of the pipe, The shape and position of other parts of the pipe do not matter.

[0062]

As is apparent from the above description, the present invention further suppresses clogging of a capillary tube, an electric expansion valve, a filter or the like of a refrigerating air conditioner in a compressor for a refrigerating air conditioner, as compared with the prior art. It has the advantage of being able to

[Brief description of drawings]

FIG. 1 is a schematic diagram of a compressor for a refrigerating and air-conditioning apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a compressor for a refrigerating air conditioner according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a compressor for a refrigerating air conditioner for evaluation in an example of the present invention.

FIG. 4 is a schematic diagram of a refrigerating and air-conditioning compressor for evaluation according to an embodiment of the present invention.

FIG. 5 is a water absorption characteristic diagram of oil in a compressor according to an embodiment of the present invention.

FIG. 6 is a water absorption characteristic diagram of oil in a compressor according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a refrigerating air conditioner for evaluation according to an embodiment of the present invention.

[Explanation of symbols]

 11 Discharge Port 12 Suction Port 13 Refrigerator Oil Surface 14 Compressor Ground Surface 15 Compressor Main Body Upper End 21 Discharge Port 22 Suction Port 23 Refrigerator Oil Surface 24 Compressor Ground Surface 25 Compressor Main Body Top 31 Discharge Port 32 Suction Port 33 Freezing Machine oil surface 34 Compressor ground surface 35 Compressor body upper end 36 Oil sampling port 41 Discharge port 42 Suction port 43 Refrigerator oil surface 44 Compressor ground surface 45 Compressor body part upper end 46 Oil sampling port 51 Compressor 52 Condenser 53 Capillary Tube 54 evaporator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Narihiro Sato 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Keizo Nakajima, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Katsuya Wakita 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A compressor for a refrigerating air conditioner, characterized in that a dry gas having a specific gravity larger than that of the atmosphere is enclosed inside. 2. A pipe-shaped refrigerant discharge part for sending out a refrigerant, a pipe-shaped refrigerant suction part for sucking the refrigerant, and a compressor main body to which the refrigerant discharge part and the refrigerant suction part are attached, respectively. A part, all or part of the refrigerant discharge part and / or the refrigerant suction part is substantially above a site attached to the compressor body, and inside the compressor body, A compressor for a refrigerating and air-conditioning apparatus, which is filled with a dry gas having a larger specific gravity than the atmosphere. 3. The discharge port of the refrigerant discharge part and / or the suction port of the refrigerant suction part is substantially above the upper surface of the compressor main body on the side opposite to the grounding surface of the compressor main body. The compressor for a refrigerating air-conditioner according to claim 2, wherein the compressor is located. 4. The compressor for a refrigerating air conditioner according to claim 1, 2, or 3, wherein the dry gas is a gas containing at least argon gas or carbon dioxide gas. 5. A compressor for a refrigerating air conditioner according to claim 1, wherein an ester oil is used as the refrigerating machine oil.