JPH08189731A - Refrigeration cycle - Google Patents

Abstract

PURPOSE: To provide a refrigeration cycle by which a stable motion can be performed for a longer period of time compared with a conventional cycle, and of which the operation mediums are a refrigerating machine oil and a refrigerant containing hydrofluorocarbon. CONSTITUTION: A refrigeration cycle is equipped with a refrigerating compressor 1, condenser 2, expansion valve 3, evaporator 4, and accumulator 7, and uses a refrigerating machine oil and a refrigerant containing hydrofluorocarbon as the operation mediums. For such a refrigeration cycle, the accumulator 7 is equipped with a container which is the main body, dryer 5 which reduces or removes moisture which exists in the operation mediums, and a hook 8 and spring 9 to protect the dryer 5 in the container from vibrations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating cycle including a refrigerating compressor, a condenser, an expansion valve or a capillary, and an evaporator and using refrigerating machine oil and a refrigerant containing hydrofluorocarbon as working media.

[0002]

2. Description of the Related Art FIG. 1 is a pipeline diagram of a conventional refrigeration cycle. That is, 1 is a refrigeration compressor, 2 is a condenser, 3 is an expansion valve (or capillary), 4 is an evaporator, and they are connected by a pipe.

FIG. 4 is a pipeline diagram of another conventional refrigeration cycle. That is, 1 is a refrigeration compressor, 2 is a condenser, 3 is an expansion valve (or capillary), 4 is an evaporator, and 7 is an accumulator, which are connected by a pipe.

In an air conditioning refrigeration cycle in which the amount of refrigerant filled in the refrigeration cycle is relatively large with respect to the internal capacity of the refrigeration cycle, or a refrigeration cycle equipped with a high-pressure container type refrigeration compressor, an evaporator and a refrigeration cycle are used. An accumulator, which is a container for storing refrigerant, is often provided between the suction sides of compressors.

In the former, when the refrigeration cycle is stopped, the refrigerant condenses in the vicinity of the refrigeration compressor, which is an outdoor unit, but the purpose is to store a portion that cannot be stored only in the compressor container. In the latter case, when the refrigerant in the working medium returned from the evaporator is not sufficiently vaporized, the liquid is sucked into the compressor as it is and compressed in order to prevent mechanical damage. The working medium is temporarily stored, and the vaporized refrigerant component or the refrigerating machine oil component necessary for lubricating the compressor is selectively sucked into the compressor. In some cases, both purposes are intended.

In such a refrigeration cycle in the field of refrigeration and air conditioning, chlorofluorocarbons (CFC) and hydrochlorofluorocarbons (HCFC) containing chlorine atoms such as dichlorodifluoromethane and chlorodifluoromethane that have been used as refrigerants are It was decided to be abolished because of the destruction of the ozone layer in the stratosphere.

Accordingly, as an alternative substance for these CFCs and HCFCs, hydrofluorocarbons containing no chlorine atom
(HFC) is now in use.

[0008]

[Problems to be Solved by the Invention] However, this HF
In a refrigeration cycle using C as a refrigerant, it is necessary to use a polar refrigerating machine oil such as polyalkylene glycol (PAG) or ester from the viewpoint of compatibility with the refrigerant. Therefore, the HFC itself of the refrigerant has a high polarity, which causes a problem that the water absorption of the working medium composed of the refrigerant and the refrigerating machine oil itself becomes extremely high.

[0009] Therefore, conventionally, there is a problem in the case where the water content in the working medium is high, there is choking in which the water freezes in the low temperature part in the refrigeration cycle, and it is effective to equip a dryer to prevent this. It was (Japanese public Sho 56-137062
Gazette, Japanese Patent Publication No. 61-168762, etc.). However, in the working medium composed of the above-mentioned HFC and a refrigerating machine oil having polarity, such chalking is unlikely to occur due to the high saturated moisture content, and it is not a problem, and this method is used for that problem. Was almost unthinkable.

Further, in Japanese Patent Laid-Open No. 56-87767, a desiccant having a refrigerant introduction part for introducing a refrigerant from the evaporator side and a refrigerant discharge part for leading out the vaporized refrigerant to the compressor side is stored. An accumulator is disclosed. However, in this conventional technique, when a desiccant is installed in a low-pressure part other than the accumulator, an expensive desiccant molded in a donut shape is required so that pressure loss does not occur, and the desiccant installation part is also required. There was a problem that it was difficult to process.

Further, Japanese Patent Laid-Open No. 4-183788 discloses a method of reducing water content by installing a desiccant between the condenser and the expansion mechanism. However, in this prior art refrigeration / air-conditioning system in which a four-way valve is provided between the compressor discharge side and the condenser and between the evaporator and the compressor suction side, and the functions of the condenser and the evaporator are exchangeable, the expansion and In the case of the operation in which the desiccant is installed after the mechanism, there is a problem that pressure loss occurs in the desiccant part due to a two-phase flow in which gas and liquid are mixed and performance is deteriorated.

Further, in Japanese Patent Laid-Open No. 5-66075, HFC-134
In a car air conditioner that uses a refrigerant, HFC-134a liquid
By considering the difference in saturated moisture content in the gas state,
The saturated water content in the HFC-134a refrigerant is efficiently obtained by arranging the water removal device in the low pressure pipeline by utilizing the characteristic that the gas state is higher, that is, the lower pressure side of the pipeline. A method for removing water is disclosed. However, in this conventional technique, that is, in the accumulator for the refrigeration cycle using the HFC refrigerant that has the desiccant holding part and the refrigerant passage part inside the accumulator, the desiccant is indicated on the net, so it may be vibrated. There has been a problem that the generated debris is distilled during the refrigeration cycle.

In addition to these problems, a working medium composed of HFC and a refrigerating machine oil having a polarity has a relatively weak carbon-oxygen bond in the chemical structure of the refrigerating machine oil, and therefore the higher the water content, the higher the water content. There is a problem that decomposition such as decomposition is likely to occur. That is, R-22 which has been used for refrigeration systems for air conditioning or large refrigerators or
When a refrigerant containing HFC-32 (difluoromethane) is used as an alternative refrigerant such as R-502, if zeolite known as molecular sieve 3A is used as a desiccant, HFC-32 is adsorbed on the zeolite, Problems such as the decomposition of HFC-32 have become clear. When this decomposition reaction occurs, HFC-32 becomes carbon monoxide and carbon dioxide, and HF
Perhaps because of hydrogen fluoride, which is considered to be generated by desorption from C-32, or because of a change in the crystal structure of the zeolite due to the reaction with HFC-32, the zeolite itself collapses, causing the broken powder to flow into the refrigeration cycle, There is a problem in that the refrigeration compressor, the expansion valve, the four-way valve are damaged, the capillaries are blocked, and the refrigeration cycle cannot be stably operated for a long period of time.

Further, when an ester of an aliphatic polyol and a fatty acid is used as a refrigerating machine oil, the ester is decomposed or the fatty acid metal salt is formed, which is considered to be due to hydrogen fluoride generated by the above decomposition, and a refrigerating compressor or an expansion is produced. There is a problem in that the valves and the four-way valve are damaged, the capillaries are clogged, and the like, so that the refrigeration cycle cannot be stably operated for a long period of time.

However, in the present situation as in the above-mentioned prior art,
Moisture countermeasures against the HCFC-22 alternative refrigerant used in conventional air conditioning refrigeration systems have not yet been fully considered.

In order to solve this new problem, it is considered effective to equip the refrigeration system with an adsorbent desiccant such as zeolite.

Japanese Unexamined Patent Publication No. 7-4787 discloses an accumulator for a refrigeration cycle using an HFC refrigerant having a desiccant holding portion and a refrigerant passage portion inside the accumulator.
However, in this prior art example, when the refrigerating machine oil used in the refrigeration cycle has an additive which is an epoxy compound, the epoxy compound reacts when the refrigerating machine oil comes into contact with the zeolite, which is a desiccant, and as an original additive. However, there is a problem that reliability is lowered because the role of the

In consideration of the above problems of the prior art, the present invention provides a refrigeration cycle using a refrigerating machine oil and a refrigerant containing hydrofluorocarbon as a working medium, which can operate stably for a longer period of time than the conventional art. The purpose is to provide.

[0019]

DISCLOSURE OF THE INVENTION The present invention for solving this problem comprises a refrigerating compressor, a condenser, an expansion valve or a capillary, and an evaporator, and operates refrigerating machine oil and a refrigerant containing hydrofluorocarbon. In a refrigeration cycle using a medium, a dryer containing zeolite that reduces or removes at least water present in the working medium is provided at a position where the working medium temperature during operation is 20 ° C. or less in the flow path of the working medium. The refrigerating cycle is characterized by being arranged.

As a result, it is possible to provide a refrigeration cycle that can be stably operated for a longer period of time as compared with the conventional case.

By the way, as a result of analyzing the chemical reaction between HFC-32 and zeolite having an adsorbed molecular size of about 3 angstroms or less, the following facts were found. 1. The higher the partial pressure of HFC-32, the greater the amount of adsorption to zeolite and the greater the amount of decomposition. 2. Within the range where the concentration change due to the decomposition of HFC-32 is small,
The reaction time and the amount of decomposition are proportional. 3. As a result of investigating the temperature dependence of HFC-32 on decomposition, there is no threshold temperature for decomposition, but this chemical reaction is 10 ° C.
With each increase, the decomposition rate constant doubles.

Based on these facts, in order to prevent the decomposition reaction between HFC-32 and zeolite from occurring at a high speed, HFC-
It is deduced that it is effective to install a dryer using zeolite in a position where the partial pressure of 32 is low and the temperature is low.

Further, the equilibrium adsorption amount of water on the zeolite increases as the temperature decreases, and as a result, the drying capacity also increases.

Further, the working medium temperature reaches about 40 to 60 ° C. in the flow path where the liquid refrigerant flows where the conventional dryer is installed.

From the above, if a dryer containing zeolite is arranged in the low-pressure flow passage, the partial pressure of HFC-32 is as small as a few fractions, and the adsorption amount for zeolite is reduced.
Along with this, the decomposition rate constant is from 1/4 to 1/16
As a result, the decomposition rate of HFC-32, which is the adsorption amount × decomposition rate constant, can be reduced to about two to three orders of magnitude.

Further, in the industrial zeolite having a variation in the adsorbed molecular diameter, the same effect can be expected because it is adsorbed and decomposed to some extent in refrigerants having a larger molecular diameter other than HFC-32.

Further, when a dryer containing zeolite is installed at a low pressure portion in a normal piping portion, the refrigerant is flowing in the gas phase, resulting in a large pressure loss, which is not preferable.
However, if it is installed inside the accumulator with a large flow cross-sectional area, it is effective without causing pressure loss.

Further, since the accumulator is normally connected to the suction side of the refrigeration compressor, it directly receives the vibration of the refrigeration compressor. Generate crushed powder of.
Then, the pulverized powder of zeolite is fine, and when a large amount is generated in the refrigeration cycle, it is deposited on the expansion valve or the capillary, which causes deterioration of the performance of the refrigeration cycle and abnormal operation. Therefore, in the liquid refrigerant inside the accumulator, the dryer containing the zeolite is suspended by suspending it using a float, or by a spring, the dryer containing the zeolite is suspended from the upper surface of the accumulator, thereby generating pulverized powder. Can be suppressed. This makes it possible to adsorb moisture in the cycle with almost no decomposition of the refrigerant or refrigerating machine oil, and it is possible to suppress the generation of pulverized powder of zeolite that causes abnormalities in the refrigeration cycle, which makes it possible for a long period of time. A stable operation can be realized.

When the refrigerant containing hydrofluorocarbon is a refrigerant containing difluoromethane, the effect of suppressing decomposition of difluoromethane, which is the refrigerant, is great.

Further, when the refrigerating machine oil is an ester of an aliphatic polyol and an aliphatic carboxylic acid, deterioration of the refrigerating machine oil is suppressed by water absorption, so that the stability of the refrigerating cycle is improved.

Further, in the present invention in which the dryer does not come into contact with the refrigerating machine oil which is a part of the working medium, the reaction with the refrigerating machine oil base oil or the refrigerating machine oil additive does not occur, and the reliability is lowered due to the refrigerating machine oil. Absent. In particular, when the refrigerating machine oil contains an epoxy compound, it does not consume it unnecessarily and can sufficiently exhibit its original function of stabilizing the working medium by capturing the reaction of the produced acid.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is provided with a refrigeration compressor, a condenser, an expansion valve or a capillary, and an evaporator, and contains a refrigerating machine oil and a refrigerant containing hydrofluorocarbon as a working medium. In the refrigerating cycle, a dryer containing zeolite that reduces or removes at least water present in the working medium is arranged at a position where the working medium temperature during operation is 20 ° C. or lower in the working medium flow path. It is a refrigeration cycle characterized by:

The working medium temperature during the above operation is 20 ° C.
The following position may be a position between the outlet of the evaporator and the suction port of the refrigeration compressor.

Further, the condenser and the evaporator are provided with a four-way valve capable of exchanging functions, and the position where the working medium temperature during operation is 20 ° C. or lower is the four-way valve and the refrigerating compressor. The position may be between the suction port and the suction port.

Further, the dryer may be equipped with a physical filter in a flow passage inside the dryer, which is closer to a suction port of the refrigeration compressor.

The invention as set forth in claim 5 is a refrigerating cycle comprising a refrigerating compressor, a condenser, an expansion valve or capillary, an evaporator, and an accumulator, and using a refrigerating machine oil and a refrigerant containing hydrofluorocarbon as a working medium. The accumulator may include a container that is a main body, a dryer that reduces or removes water present in the working medium, and a vibration absorbing unit that protects the dryer inside the container from vibration.

The vibration absorbing means may protect the dryer by suspending it with a spring.

Further, the accumulator is provided with an opening of a refrigerant introducing pipe located in an upper portion inside the container for introducing a refrigerant from the evaporator, and the vibration absorbing means is injected from the opening of the refrigerant introducing pipe. The dryer may be arranged so as not to come into direct contact with the working medium.

Further, the accumulator is provided with an opening of a refrigerant outlet pipe located in a lower portion inside the container for feeding the refrigerant to the refrigeration compressor, and the vibration absorbing means is provided below the opening of the refrigerant outlet pipe. The dryer may be suspended by a float so that the dryer is located in the working medium of the liquid present.

The invention as set forth in claim 9 is provided with a freeze-cooling compressor, a condenser, an expansion valve or a capillary, an evaporator, and an accumulator, and uses a refrigerating machine oil and a refrigerant containing hydrofluorocarbon as a working medium. At
The accumulator does not come into direct contact with the container that is the main body, the opening of the refrigerant introduction pipe that is located inside the container and that introduces the refrigerant from the evaporator, and the working medium that is injected from the opening of the refrigerant introduction pipe. And a dryer installed at a position for reducing or removing water present in the working medium.

The accumulator is provided with an opening of a refrigerant outlet pipe located below the inside of the container for feeding the refrigerant to the refrigeration compressor, and the dryer is provided with an opening of the refrigerant inlet pipe and the refrigerant outlet pipe. It may be installed inside the container other than between the opening and the opening.

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

FIG. 2 is a pipeline diagram according to the first embodiment of the refrigeration cycle of the present invention. That is, the refrigeration cycle is composed of the refrigeration compressor 1, the condenser 2, the expansion valve (or capillary) 3, the evaporator 4, the dryer 5, and the pipes connecting them.

In the refrigerating cycle of this embodiment, a dryer using zeolite as a desiccant is arranged in the flow path at a position where the working medium temperature during operation is 20 ° C. or lower. That is, the flow path at the position where the working medium temperature during operation is 20 ° C. or lower depends on the refrigerant to be used and the operating conditions, but is the part from the evaporator to the compressor suction side. The dryer 5 is installed in the middle of a pipe connecting the evaporator 4 and the suction side of the refrigeration compressor 1, that is, a low-pressure gas pipe.

The structure of the refrigerating cycle itself of this embodiment is a known one except the dryer 5 containing zeolite which is installed in the flow path between the outlet of the evaporator 4 and the inlet of the refrigerating compressor 1. Is almost the same as.

Next, the operation of the configuration of this embodiment, which is different from the conventional one, will be mainly described. The dryer 5 uses zeolite, which is also called molecular sieve, as a water adsorbent, and may be inserted in a case for installation in the middle of the piping. At the same time, the dryer 5 may damage the refrigeration compressor 1 and the expansion valve 3. A filter capable of removing foreign matter having a stain and a cushioning material for suppressing the destruction of zeolite due to vibration may be inserted.

Zeolite is a compound having various crystal forms, but it has a vacancy in the crystal, and various molecules such as water can be taken into the vacancy, and thus it is called a molecular sieve. The size of the pores is changed by changing the element species constituting the compound, and a zeolite having a preferable pore size is selected according to the target gas and solvent to be dried.

In a refrigeration cycle using so-called CFCs as a refrigerant, a molecular sieve 3A having pores having a size of about 3 angstroms has been used, but CFC (chlorofluorocarbon) and HCFC that deplete the ozone layer are used.
Among the HFC (hydrofluorocarbon) systems proposed to eliminate (hydrochlorofluorocarbon), HFC-32 (difluoromethane) has an effective molecular diameter of 3.
In addition to water, the molecular sieve 3A is as small as 1 angstrom and has pores of about 3 angstroms.
HFC-32 is also adsorbed.

As a result of analyzing the chemical reaction when HFC-32 was adsorbed on zeolite, we found that the decomposition of HFC-32 caused
HFC-32 was found to be carbon monoxide and carbon dioxide. Since these carbon monoxide and carbon dioxide are gases that do not condense in the refrigeration cycle (non-condensable gases), HFC-32
Not only leads to the reduction of the refrigerant, but also leads to the generation of non-condensable gas that hinders the circulation of the refrigerant during the refrigeration cycle, and the refrigerating capacity decreases.

Further, probably due to hydrogen fluoride which is considered to be generated by desorption from HFC-32, the zeolite itself collapses, and the debris is flown out into the refrigeration cycle, and the refrigeration compressor 1
Also, the expansion valve 3 and the four-way valve 6 are damaged, the capillaries are blocked, etc., and as a result, the refrigeration cycle cannot be stably operated for a long period of time.

Here, the reason why the dryer 5 using zeolite as a drying material is provided in the flow path at the position where the temperature of the working medium during operation is 20 degrees or less will be described. (However, the reason is
The reason is not limited to the present embodiment and the following embodiments. For example, the reason why the dryer 5 containing zeolite for reducing or removing the water existing in the working medium is provided inside the accumulator 7 in the fifth or seventh embodiment by being suspended from the inner upper surface of the accumulator 7 by the spring 9 Becomes ) In the conventional refrigeration cycle that uses CFC-12 as the working refrigerant, the internal pressure from the evaporator to the compressor intake side is below atmospheric pressure when the pipe material has high water permeability, such as in a car air conditioner, or in a refrigerator. In such a case, if a leak in the pipe can be expected, a dryer 5 is generally installed in the middle of the pipe from the condenser 2 to the expansion valve 3 in order to remove water that may be mixed in the refrigeration cycle. Target.

The reason for this is that it is effective to install at a position where a liquid having a low flow velocity flows in order to minimize the pressure loss due to an object that obstructs the flow of fluid such as a desiccant (while operating. In the refrigeration cycle using HCFC-22 as the medium, the dryer 5 was rarely used because there is no possibility of water being mixed in from outside the cycle).

As a result of investigating the temperature dependence of HFC-32 on the decomposition, there is no threshold temperature for the decomposition, and it is a chemical reaction in which the decomposition rate constant is approximately doubled every 10 ° C. increase. It has been found.

Therefore, in the flow path in which the liquid refrigerant flows where the conventional dryer is installed as described above, the working medium temperature reaches about 40 to 60 ° C., but the flow path at the position at 20 ° C. or lower (the fifth Alternatively, in the seventh embodiment, if the dryer 5 containing zeolite is arranged inside the accumulator 7, HFC-
Since the partial pressure of 32 is as small as a few fractions, the amount of adsorption on zeolite decreases and the decomposition rate constant decreases from 1/4 to 1
Since it is reduced to about 1/6, the decomposition rate of HFC-32, which is the adsorption amount × decomposition rate constant, can be reduced by 2 to 3 digits.

Next, a more specific experimental example will be shown. (Experimental Example 1) Inner diameter 8.5 mm, outer diameter 12 mm, length about 1
In a 5 cm Pyrex glass tube, 2 g of synthetic zeolite (UH XH-10C) and 2 g of HFC-3.
Two samples containing 2 and were prepared.

Next, the samples were placed in a constant temperature bath set at 60 ° C. and a constant temperature bath set at 20 ° C., and allowed to stand for 90 days. Open the inside of a copper tube with a rubber stopper attached, analyze the gas with a gas chromatography device, and remove carbon monoxide,
Also, the amount of carbon dioxide generated was examined.

As a result, in the case of the sample left in the constant temperature bath at 60 ° C., it was confirmed that 1.1 ml of gas in terms of atmospheric pressure was generated in total of carbon monoxide and carbon dioxide.

On the other hand, in the case of the sample left in the constant temperature bath at 20 ° C., the amount of the generated gas was extremely small, about 40 μl.

(Experimental Example 2) An air conditioner dedicated air conditioner was constructed by inserting a dryer having a copper tube filled with 30 g of zeolite (XH-10C, UOP Co.) between the capillary and the evaporator.

Zeolite (XH-10C, UOP Co.) 3 was added to the accumulator between the evaporator and the suction side of the compressor.
An air conditioner dedicated air conditioner containing a dryer in which 0 g was wrapped in a non-woven fabric was constructed.

For each cooling-dedicated air conditioner, 300 g of ester-based refrigerating machine oil and refrigerant R407C (HFC32: 125: 13) were used.
4a = 23: 25: 52 wt%) was charged, and continuous cooling operation was performed for 2000 hours in a 28 ° C. constant temperature room.

During this period, the temperature of the dryer part of the former air conditioner was 53 ° C. on average, and the temperature of the dryer part of the latter air conditioner was 17 ° C. on average.

After the operation was completed, a gas such as a refrigerant was collected in a pressure resistant container cooled with liquid nitrogen, and then analyzed by a gas chromatography device to examine the amount of carbon monoxide and carbon dioxide produced.

As a result, in the former case, it was confirmed that a total of carbon monoxide and carbon dioxide produced about 20 ml of gas in terms of atmospheric pressure.

On the other hand, in the latter case, the amount of gas generated was extremely small, 1 ml or less.

After the experiment, the water content in the recovered refrigerant and the total acid value of the refrigerating machine oil were measured.
The total acid value was 0.01 or less, the moisture content was 8 wtppm and the total acid value was 0.01 or less in the latter case, and there was no difference in water absorption capacity and thereby no difference in the degree of hydrolysis of the refrigerating machine oil.

As described above, as is clear from the present experimental example, by placing a dryer using zeolite as a desiccant in a flow path at a position where the working medium temperature is 20 ° C. or lower, the refrigeration cycle is frozen. It is possible to suppress the decomposition of the refrigerant that reduces the capacity and the generation of non-condensable gas due to the decomposition.

Further attempts will be made in the future to improve the adsorbate selectivity of the zeolite, but industrial zeolites have a large variation in the adsorbed molecular diameter, and thus the molecular diameter is larger than that of HFC-32 as well as others. Since the refrigerant is also adsorbed and decomposed to some extent, the same effect can be expected.

Further, since HFC such as HFC-32 has a large molecular polarity, it is difficult to be compatible with nonpolar oils such as mineral oil, alkylbenzene and poly α-olefin oil which have been conventionally used as refrigerating machine oil. , PAG and ester oil, it is preferable to use as a working medium together with a polar oil such as ether oil, especially when the refrigerating machine oil is an ester of an aliphatic polyol and an aliphatic carboxylic acid, it is hydrolyzed in the presence of water, It easily reacts with various metals in the refrigeration cycle (cast iron, aluminum, other components such as compressors, copper in pipes, etc.) to form fatty acid metal salts.

Since such a fatty acid metal salt has a low solubility in a polar liquid having a high HFC ratio, a trouble may occur in which the flow path is blocked by an expansion valve, a capillary or the like.

Since the zeolite used as the desiccant is basic, it adsorbs the fatty acid produced by hydrolysis.
The production of a fatty acid metal salt can be suppressed, which is a preferable constitution.

FIG. 3 is a pipeline diagram according to the second embodiment of the refrigeration cycle of the present invention. That is, 1 is a refrigeration compressor, 2 is a condenser, 3 is an expansion valve (or capillary), 4 is an evaporator,
Reference numeral 5 is a dryer, and 6 is a four-way valve, which are connected by piping.

In an air conditioner such as a room air conditioner, a refrigerating cycle as shown in FIG. 3 (a dryer is not conventionally provided) is provided in order to perform cooling and heating in the same refrigerating cycle, and a four-way valve is rotated to connect between a condenser and an evaporator. By reversing the flow direction of the working medium, the functions of the condenser and the evaporator are substantially exchanged.

In the refrigeration cycle of this embodiment, a dryer using zeolite as a desiccant is arranged in the flow path of the working medium located between the four-way valve and the suction port of the refrigeration compressor. By this method, even if foreign matter circulating in the refrigeration cycle is deposited on the dryer filled with zeolite, there is no backflow, and therefore the deposit is not released into the refrigeration cycle again, which is preferable.

Further, this position is preferable because the working medium temperature during operation is 20 ° C. or lower in both cooling operation and heating operation.

Furthermore, the structure of the dryer uses zeolite as a desiccant and a physical filter is provided on the suction port side of the refrigeration compressor inside the dryer, so that the filtering effect of foreign matter circulating in the refrigeration cycle can be obtained. Added,
It is preferable because it can be enhanced.

The physical filter is a mesh made of metal wire or the like, a plate-like material made of sintered metal or ceramics with pores, glass wool, metal wool, etc., and captures an object having a specific size or more. It is possible.

In addition to the above zeolite and physical filter, the dryer may be filled with silica or alumina capable of adsorbing a polar substance, or an ion exchange resin capable of trapping an ionic substance.

FIG. 5 is a pipeline diagram according to a third embodiment of the refrigeration cycle of the present invention in which the accumulator 7 in the conventional refrigeration cycle of FIG. 4 is improved. That is, the accumulator 7 has a dryer 5 containing zeolite suspended by a spring 9 from a hook 8 on its inner upper surface.

Granular zeolite is wrapped in a woven fabric of polyethylene, polyester, polyvinyl acetal, polyamide fiber, etc., or a basket made of polyester, polyamide, fluororesin, polyethylene or the like is used, and a cushion of glass wool, steel wool, absorbent cotton, etc. A dryer is made by adding granular zeolite together with the material, and the dryer is fixed to the other end of a spring 9 whose one end is fixed to a hook 8 provided on the upper surface inside the accumulator.

The elastic modulus and length of the spring may be adjusted so that the dryer is always suspended inside the accumulator. The inside of the accumulator may be assumed to be almost filled with only the refrigerant gas and filled with the liquid refrigerant-refrigerating machine oil mixture. As a configuration for easily obtaining the suspended state, a method of fixing the dryer to the dryer with an appropriate spring from the inner lower surface of the accumulator can be mentioned.

By suspending the dryer in this way, the resonance frequency can be shifted with respect to the vibration transmitted from the refrigeration compressor, and crushing due to mechanical collision between zeolites inside the dryer can be suppressed. .

The baffle plate 10 is provided for colliding the working medium that has entered the accumulator and separating refrigerating machine oil which is a liquid. The shape is not particularly limited. For example, new edition, fifth edition, Refrigeration and Air Conditioning Handbook, Volume II, Equipment Edition (edited and published by the Japan Refrigeration Association, 1993), pages 109 to 116, oil separator, liquid. The separation mechanism such as a separator may be referred to.

It is necessary to install the mouth of the refrigerant outlet pipe 11 at a position where the liquid working medium stored in the accumulator is not sucked by the refrigeration compressor as a liquid. Even if only the refrigerant gas is always sucked, the refrigerating machine oil does not return to the compressor, so it is possible to install a separate oil return pipe at the bottom of the accumulator, or to make a small hole in the lower part of the accumulator of the refrigerant outlet pipe 11. desired.

FIG. 6 is a pipeline diagram according to a fourth embodiment of the refrigeration cycle of the present invention in which the accumulator 7 in the conventional refrigeration cycle of FIG. 4 is improved. That is, the accumulator 7 has the dryer 5 suspended by the float 12 and suspended in the liquid working medium inside the accumulator 7.

Granular zeolite wrapped with a woven cloth of polyethylene, polyester, polyvinyl acetal, polyamide fiber, etc., or a basket formed of polyester, polyamide, fluororesin, polyethylene, etc., cushioned with glass wool, steel wool, absorbent cotton, etc. Float, such as hollow spheres made of polyethylene or fluororesin, in which granular zeolite is put together with the material 12
Combine with and make a dryer.

Whenever a liquid working medium is present in the accumulator, it can be targeted for drying.
Also, because it floats on the liquid surface, the float itself fluctuates due to the resonance of the liquid surface that is affected by the vibration transmitted from the refrigeration compressor, but the suspended zeolite is in the liquid and receives only smaller vibrations. Since it does not exist, it is possible to suppress pulverization due to mechanical collision between zeolites inside the dryer.

In the refrigeration cycle of the present invention, when the working oil refrigerating machine oil used in the refrigeration cycle contains an ester of an aliphatic polyol and an aliphatic carboxylic acid,
Great effect.

Examples of the aliphatic polyol compound include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, glycerol, neopentyl glycol, and 1,2.
-, 1,3- and l, 4-butanediol, pentaerythritol, dipentaerythritol, tripentaerythritol, triglycerol, trimethylolpropane,
Examples thereof include ditrimethylolpropane, sorbitol, hexaglycerol, and 2,2,4-trimethyl-1,3-pentanediol.

As the aliphatic carboxylic acid, formic acid, acetic acid,
Propionic acid, butyric acid, valeric acid, hexanoic acid, heptanoic acid, isobutyric acid, 2-ethyl-n-butyric acid, 2-methylbutyric acid,
2,2,4-trimethylpentanoic acid, 2-hexyldecanoic acid, isostearic acid, 2-methylhexanoic acid, 3,
5,5-trimethylhexanoic acid, 2-ethylhexanoic acid,
Isooctanoic acid, isononanoic acid, isoheptanoic acid, isodecanoic acid, neopentanoic acid, neoheptanoic acid, neodecanoic acid, and IS0 acid (IS0Acids) and NE0 acid (NE0Acid)
s) (These are ExxonCh
emica1Company) (available from Hyeuston, Texas, USA)) and the like.

IS0 acid is a mixture of isomers of branched acids, including commercially available mixtures (eg IS0 heptanoic acid, IS0 octanoic acid and IS0 nonanoic acid) and products under development (eg IS0 decanoic acid and IS0810 acid). Of the ISO acids, ISO octanoic acid and ISO nonanoic acid are preferred. NE0 acids include commercial mixtures such as NE0 pentanoic acid, NE0 heptanoic acid and NE0 decanoic acid, and products under development such as ECR-909 (NE0C9) acid, and
ECR-9030 (NEO C1214) acid), and commercial mixtures of branched chain carboxylic acids (eg, Exxon mixture identified as NE01214 acid).

When the refrigerating machine oil is a non-polar oil such as an alkylbenzene oil, a mineral oil, or a poly-α-olefin oil, most of the water in the refrigeration cycle is retained by the refrigerant in the working medium, and is not in the liquid phase. Because of the compatibility, the liquid refrigerant is separated into two phases from the refrigerating machine oil, so that if the zeolite of the dryer is covered with the refrigerating machine oil, the water supply capacity is extremely reduced.

If the refrigerating machine oil is a polar oil such as polyalkylene glycol having a very high water absorption, the water absorption equilibrium with the zeolite will be that of the oil, and even if a drier is put in, it will not be able to absorb much water.

FIG. 7 is a pipeline diagram according to the fifth embodiment of the refrigeration cycle of the present invention. That is, 1 is a refrigeration compressor, 2 is a condenser, 3 is an expansion valve (or capillary), 4 is an evaporator,
7 is an accumulator, and they are connected by piping. In the refrigeration cycle of the present embodiment, the dryer 5 having zeolite as a desiccant is arranged inside the accumulator.

In this embodiment, a drier 5 containing zeolite for reducing or removing water present in the working medium is provided inside the accumulator 7 suspended from the upper surface of the inside of the accumulator 7 by a spring. In the description, the configuration different from the conventional one will be mainly described in relation to the configuration.

The dryer 5 uses zeolite, which is also called molecular sieve, as a moisture adsorbent, and prevents pulverized powder of zeolite that may damage the refrigeration compressor 1 and the expansion valve 3 from being released during the refrigeration cycle. It may be wrapped with a filter material for the purpose of insertion, or a cushioning material for suppressing the destruction of zeolite due to vibration may be inserted.

FIG. 8 is an enlarged view of the accumulator 7 of FIG. That is, 5 is a dryer containing zeolite, 8 is a hook, and 9 is a spring. The dryer 5 is suspended by a spring 9 hooked on a hook 8 on the upper surface of the inside of the accumulator 7.

Granular zeolite wrapped with a woven cloth of polyethylene, polyester, polyvinyl acetal, polyamide fiber, etc., or a basket made of polyester, polyamide, fluororesin, polyethylene, etc., cushioned with glass wool, steel wool, absorbent cotton, etc. A drier 5 is made by adding granular zeolite together with the material, and the drier 5 is fixed to the other end of a spring 9 having one end fixed to a hook 8 provided on the upper surface inside the accumulator 7.

The elastic modulus and length of the spring may be adjusted so that the dryer is always suspended inside the accumulator. The inside of the accumulator may be assumed to be almost filled with only the refrigerant gas and filled with the liquid refrigerant-refrigerating machine oil mixture. As a configuration for easily obtaining the suspended state, a method of fixing the dryer to the dryer with an appropriate spring from the inner lower surface of the accumulator can be mentioned.

By suspending the dryer in this way, the resonance frequency can be shifted with respect to the vibration transmitted from the refrigeration compressor, and crushing due to mechanical collision between zeolites inside the dryer can be suppressed. .

Further, since HFC such as HFC-32 has a large molecular polarity, it is difficult to be compatible with non-polar oils such as mineral oil, alkylbenzene and poly α-olefin oil which have been conventionally used as refrigerating machine oil. , PAG and ester oil, it is preferable to use as a working medium together with a polar oil such as ether oil, especially when the refrigerating machine oil is an ester of an aliphatic polyol and an aliphatic carboxylic acid, it is hydrolyzed in the presence of water, It easily reacts with various metals in the refrigeration cycle (cast iron, aluminum, other components such as compressors, copper in pipes, etc.) to form fatty acid metal salts.

Since such a fatty acid metal salt has a low solubility in a polar liquid having a high HFC ratio, a trouble may occur in which the flow path is blocked by an expansion valve, a capillary or the like.

Since the zeolite used as the desiccant is basic, it adsorbs the fatty acid produced by hydrolysis,
The production of a fatty acid metal salt can be suppressed, which is a preferable constitution. The specific experimental example according to this example is the same as the experimental examples 1 and 2 described above.

FIG. 9 is a pipeline diagram according to the sixth embodiment of the refrigeration cycle of the present invention. That is, 1 is a refrigeration compressor, 2 is a condenser, 3 is an expansion valve (or capillary), 4 is an evaporator,
7 is an accumulator, and they are connected by piping. In the refrigeration cycle of the present embodiment, the dryer 5 containing zeolite that reduces or removes the water present in the working medium is suspended by the float 12 inside the accumulator 7.

FIG. 10 is an enlarged view of the accumulator 7 shown in FIG. The dryer 5 is suspended in the liquid working medium inside the accumulator 7 and suspended by the float 12 to float.

A granular zeolite is wrapped with a woven cloth of polyethylene, polyester, polyvinyl acetal, polyamide fiber or the like, or a basket formed of polyester, polyamide, fluororesin, polyethylene or the like is used as a cushion of glass wool, steel wool, absorbent cotton, etc. A dryer 5 is made by adding granular zeolite together with the material, and is combined with a float 12 such as a hollow sphere made of polyethylene or fluororesin.

Whenever a liquid working medium is present in the accumulator, it can be targeted for drying.
Also, because it floats on the liquid surface, the float itself fluctuates due to the resonance of the liquid surface that is affected by the vibration transmitted from the refrigeration compressor, but the suspended zeolite is in the liquid and receives only smaller vibrations. Since it does not exist, it is possible to suppress pulverization due to mechanical collision between zeolites inside the dryer.

FIG. 11 is a sectional view of an accumulator according to the seventh embodiment of the refrigeration cycle of the present invention. That is, 5
Is a dryer, 7 is an accumulator, 11 is a refrigerant outlet pipe,
Reference numeral 14 is a refrigerant introduction pipe, and 15 is an oil return pipe.

The refrigerant introduced from the refrigerant introduction pipe 14 moves to the compressor suction side through the refrigerant outlet pipe 11. It is desirable to have an oil return pipe 15 to return refrigeration oil circulating with the refrigerant to the compressor. Although the dryer 5 is installed under the refrigerant introduction pipe 14, since it does not come into direct contact with the refrigerant containing the refrigerating machine oil ejected from the introducing pipe, it does not react with the refrigerating machine oil base oil or the refrigerating machine oil additive, and the refrigerating machine oil is There is no reduction in reliability due to this.

In particular, when the refrigerating machine oil contains the epoxy compound, it is not consumed unnecessarily, and the original function of stabilizing the working medium by capturing the reaction of the produced acid can be sufficiently exhibited.

FIG. 12 is a sectional view of an accumulator according to the eighth embodiment of the refrigeration cycle of the present invention. That is, 5 is a dryer, 7 is an accumulator, 8 is a hook,
Reference numeral 9 is a spring, 11 is a refrigerant outlet pipe, 13 is an oil return hole, 14 is a refrigerant inlet pipe, 16 is a refrigerant inlet pipe opening, and 17 is a refrigerant outlet pipe opening.

The dryer 5 is located at a position opposite to the refrigerant introduction pipe opening 16. The dryer 5 is suspended from the inner upper surface of the accumulator by a spring as in the fifth embodiment. An oil return hole 13 is provided in the lower portion of the refrigerant outlet pipe for returning the refrigerating machine oil to the compressor.

Since the opening of the refrigerant introduction pipe and the opening of the refrigerant discharge pipe do not face each other, even if the working medium ejected from the opening of the introduction pipe contains a large amount of liquid refrigerant, it is not directly discharged.

FIG. 13 is a sectional view of an accumulator according to the ninth embodiment of the refrigeration cycle of the present invention. That is, 5 is a dryer, 7 is an accumulator, 10 is a baffle plate, 11 is a refrigerant outlet pipe, 13 is an oil return hole, 14 is a refrigerant inlet pipe, 16 is a refrigerant inlet pipe opening, 17 is a refrigerant outlet pipe opening,
Reference numeral 18 is a shield plate 16.

The dryer 5 is located above the refrigerant inlet pipe opening 16 and the refrigerant outlet pipe opening 17 of the accumulator, and the refrigerant inlet pipe opening 16 faces downward. In particular, in such a configuration, the liquid surface of the liquid working medium that does not directly contact the refrigerant containing the refrigerating machine oil ejected from the refrigerant introduction pipe opening, and the liquid surface of the liquid working medium accumulated inside the accumulator comes to a position above the refrigerant derivation pipe opening. Since it does not exist, the configuration is more preferable.

A shield plate 18 is provided in order to avoid contact with the liquid working medium ejected from the opening of the refrigerant introduction tube as much as possible.
The baffle plate 10 may be provided when the openings are shaped because the structures of the inlet pipe and the outlet pipe are simple.

Similar to the third embodiment, the baffle plate 10 is provided for colliding the working medium entering the accumulator and separating the refrigerating machine oil which is a liquid.

FIG. 14 is a tenth embodiment of the refrigeration cycle of the present invention.
FIG. 3 is a pipeline diagram according to the example of FIG. That is, 1 is a refrigeration compressor, 2 is a condenser, 3 is a compression valve (or capillary), 4 is an evaporator, 6 is a four-way valve, and 7 is an accumulator.

In an air conditioner such as a room air conditioner, a refrigerating cycle as shown in FIG. 14 is used to perform cooling and heating in the same refrigerating cycle, and the four-way valve is rotated to change the flow direction of the working medium between the condenser and the evaporator. By reversing, the functions of the condenser and the evaporator are substantially exchanged.

In the refrigerating cycle of this embodiment shown in FIG. 14, the dryer using zeolite as a desiccant is arranged in the accumulator located between the four-way valve and the suction port of the refrigerating compressor by the above-mentioned method.

This position is preferable because it is a position where the working medium temperature and pressure during operation are low in both the cooling operation and the heating operation.

In addition to the above zeolite and physical filter, the dryer may be filled with silica or alumina capable of adsorbing a polar substance, or an ion exchange resin capable of trapping an ionic substance.

Next, a more specific experimental example will be shown.

(Experimental Example 3) Zeolite (XH-1 manufactured by UOP Co., Ltd.) was used as an accumulator between the evaporator and the suction side of the compressor.
0C) 30 g of a non-woven fabric drier was bonded to a polyethylene float to form an air conditioning dual-purpose air conditioner.

Further, an air conditioning dual-use air conditioner having an accumulator as shown in FIG. 7 between the evaporator and the suction side of the compressor was constructed.

260 g of an ester type refrigerating machine oil containing 1% by weight of an epoxy compound, phenylglycidyl ether, and a refrigerant R407C (HFC32: 125: 13) were added to each of the air conditioners.
(4a = 23: 25: 52 wt%) 700 g was charged, and the operation was performed in a constant temperature room at 25 ° C. every 500 hours for a total of 500 hours.

After the experiment, each refrigerating machine oil was recovered, and the residual ratio of phenylglycidyl ether was measured.
They are 0% and 90%, and when the dryer comes into contact with the refrigerating machine oil, even if the epoxy compound is largely consumed by the reaction with the zeolite, it is provided at a position where the dryer does not come into contact with the liquid working medium inside the accumulator. No significant consumption by the zeolite was observed.

As is clear from the above experimental examples, a refrigerating machine including a refrigerating compressor containing a hydrofluorocarbon-containing refrigerant and refrigerating machine oil as a working medium, a condenser, an expansion valve or a capillary, an evaporator and an accumulator. In the cycle, a dryer containing zeolite that reduces or removes water present in the working medium is provided in a position in the accumulator where it does not come into contact with the liquid working medium, thereby preventing waste of the refrigerating machine oil additive used in the refrigeration cycle and ensuring reliability. A refrigeration cycle with high properties can be obtained.

In the refrigerating cycle of the present invention, when the working fluid refrigerating machine oil used in the refrigerating cycle contains an ester of an aliphatic polyol and an aliphatic carboxylic acid,
Great effect.

As the aliphatic polyol compound, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, glycerol, neopentyl glycol, 1,2
-, 1,3- and l, 4-butanediol, pentaerythritol, dipentaerythritol, tripentaerythritol, triglycerol, trimethylolpropane,
Examples thereof include ditrimethylolpropane, sorbitol, hexaglycerol, and 2,2,4-trimethyl-1,3-pentanediol.

As the aliphatic carboxylic acid, formic acid, acetic acid,
Propionic acid, butyric acid, valeric acid, hexanoic acid, heptanoic acid, isobutyric acid, 2-ethyl-n-butyric acid, 2-methylbutyric acid,
2,2,4-trimethylpentanoic acid, 2-hexyldecanoic acid, isostearic acid, 2-methylhexanoic acid, 3,
5,5-trimethylhexanoic acid, 2-ethylhexanoic acid,
Isooctanoic acid, isononanoic acid, isoheptanoic acid, isodecanoic acid, neopentanoic acid, neoheptanoic acid, neodecanoic acid, and IS0 acid (IS0Acids) and NE0 acid (NE0Acid)
s) (These are ExxonCh
emica1Company) (available from Hyeuston, Texas, USA)) and the like.

IS0 acids are isomeric mixtures of branched acids, which include commercially available mixtures (eg IS0 heptanoic acid, IS0 octanoic acid and IS0 nonanoic acid) and products under development (eg IS0 decanoic acid and IS0810 acid). Of the ISO acids, ISO octanoic acid and ISO nonanoic acid are preferred. NE0 acids include commercial mixtures such as NE0 pentanoic acid, NE0 heptanoic acid and NE0 decanoic acid, and products under development such as ECR-909 (NE0C9) acid, and
ECR-9030 (NEO C1214) acid), and commercial mixtures of branched chain carboxylic acids (eg, Exxon mixture identified as NE01214 acid).

When the refrigerating machine oil is a non-polar oil such as an alkylbenzene oil, a mineral oil, or a poly-α-olefin oil, most of the water in the refrigeration cycle is held by the refrigerant in the working medium and is not in the liquid phase. Because of the compatibility, the liquid refrigerant is separated into two phases from the refrigerating machine oil, so that if the zeolite of the dryer is covered with the refrigerating machine oil, the water supply capacity is extremely reduced.

When the refrigerating machine oil is a polar oil having a very high water absorption such as polyalkylene glycol, the water absorption equilibrium with the zeolite is more than that of the oil, and even if a drier is added, the water cannot be absorbed so much and the effect is small.

[0135]

As is clear from the above description, the present invention has an advantage that it can provide a refrigeration cycle capable of operating stably for a longer period of time as compared with the prior art.

[Brief description of drawings]

FIG. 1 Pipeline diagram of a conventional refrigeration cycle

FIG. 2 is a pipeline diagram according to the first embodiment of the refrigeration cycle of the present invention.

FIG. 3 is a pipeline diagram according to a second embodiment of the refrigeration cycle of the present invention.

FIG. 4 is a pipeline diagram of another conventional refrigeration cycle.

5 is a sectional view of an accumulator according to a third embodiment of the refrigeration cycle of the present invention, which is an improvement of the accumulator 7 in the conventional refrigeration cycle of FIG.

6 is a sectional view of an accumulator according to a fourth embodiment of the refrigeration cycle of the present invention, which is an improvement of the accumulator 7 in the conventional refrigeration cycle of FIG.

FIG. 7 is a pipeline diagram according to a fifth embodiment of the refrigeration cycle of the present invention.

FIG. 8 is a sectional view of the accumulator 7 of FIG.

FIG. 9 is a pipeline diagram according to a sixth embodiment of the refrigeration cycle of the present invention.

FIG. 10 is a sectional view of the accumulator 7 of FIG.

FIG. 11 is a sectional view of an accumulator according to a seventh embodiment of the refrigeration cycle of the present invention.

FIG. 12 is a sectional view of an accumulator according to an eighth embodiment of the refrigeration cycle of the present invention.

FIG. 13 is a sectional view of an accumulator according to a ninth embodiment of the refrigeration cycle of the present invention.

FIG. 14 is a pipeline diagram according to a tenth embodiment of the refrigeration cycle of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Refrigeration compressor 2 ... Condenser 3 ... Expansion valve (or capillary) 4 ... Evaporator 5 ... Dryer 6 ... Four-way valve 7 ... Accumulator 8 ... Hook 9 ... Spring 10 ... Baffle plate 11 ... Refrigerant outlet pipe 12 ... Float 13 ... oil return hole 14 ... refrigerant introduction pipe 15 ... oil return pipe 16 ... refrigerant introduction pipe opening 17 ... refrigerant outlet pipe opening 18 ... shielding plate

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Keizo Nakajima 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Nobuo Sonoda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] 1. A refrigeration cycle including a refrigeration compressor, a condenser, an expansion valve or a capillary, and an evaporator, wherein a refrigerating machine oil and a refrigerant containing hydrofluorocarbon are used as a working medium in a flow path of the working medium. A refrigerating cycle characterized in that a dryer containing zeolite that reduces or removes water present in the working medium is arranged at a position where the working medium temperature during operation is 20 ° C. or lower. 2. The position at which the temperature of the working medium during operation is 20 ° C. or lower is a position between the outlet of the evaporator and the suction port of the refrigerating compressor. Refrigeration cycle described. 3. A four-way valve capable of exchanging the functions of the condenser and the evaporator is provided, and the position where the working medium temperature during operation is 20 ° C. or lower is the four-way valve and the refrigeration compressor. The refrigeration cycle according to claim 1, wherein the refrigeration cycle is located between the suction port and the suction port. 4. The dryer is equipped with a physical filter in a flow passage inside the dryer, which is closer to a suction port of the refrigeration compressor.
Refrigeration cycle described. 5. A refrigeration cycle comprising a refrigeration compressor, a condenser, an expansion valve or capillary, an evaporator, and an accumulator, wherein a refrigerating machine oil and a refrigerant containing hydrofluorocarbon are used as working media, and the accumulator is a main body. A refrigeration cycle comprising: a container, a dryer for reducing or removing water present in the working medium, and a vibration absorbing unit for protecting the dryer inside the container from vibration. 6. The vibration absorbing means protects the dryer by suspending it with a spring.
Refrigeration cycle described. 7. The accumulator comprises an opening of a refrigerant introducing pipe located in an upper portion inside the container for introducing a refrigerant from the evaporator, and the vibration absorbing means injects from the opening of the refrigerant introducing pipe. The refrigeration cycle according to claim 5, wherein the dryer is arranged so as not to come into direct contact with the working medium that operates. 8. The accumulator includes an opening of a refrigerant outlet pipe that is located in a lower portion inside the container and that sends a refrigerant to the refrigeration compressor, and the vibration absorbing unit is provided below the opening of the refrigerant outlet pipe. The refrigerating cycle according to claim 5, wherein the dryer is suspended by a float so that the dryer is located in the working medium of the existing liquid. 9. A refrigeration cycle that includes a refrigeration compressor, a condenser, an expansion valve or capillary, an evaporator, and an accumulator, and uses refrigerating machine oil and a refrigerant containing hydrofluorocarbon as a working medium, wherein the accumulator is a main body. A certain container, an opening of a refrigerant introduction pipe that introduces a refrigerant from the evaporator, which is located inside the container, and a position that does not directly contact the working medium injected from the opening of the refrigerant introduction pipe. And a dryer for reducing or removing water present in the working medium. 10. The accumulator includes an opening of a refrigerant outlet pipe that is located in a lower portion inside the container and sends a refrigerant to the refrigeration compressor, and the dryer includes an opening of the refrigerant inlet pipe and the refrigerant outlet pipe. The refrigerating cycle according to claim 9, wherein the refrigerating cycle is installed inside the container except between the opening and the opening.