JPH11201588A - Refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a refrigeration system by reducing or eliminating oxygen in a refrigeration system. SOLUTION: By installing a filter where an oxygen scavenger is filled in a form where the inside of the body of an accumulator 7 is divided into upper and lower spaces at a position that is at the upper portion of the opening of a refrigerant-leading pipe 12 and where an actuation medium being injected from the opening of a refrigerant-introducing pipe 12 does not directly collide, oxygen in a refrigeration system is effectively eliminated, the generation of carbon dioxide and a refrigerator oil polymer due to the decomposition of a refrigerator oil can be prevented and also powdering of the oxygen scavenger 14 can be prevented, thus improving system reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a compressor, a condenser,
The present invention relates to a refrigeration system including an expansion valve or a capillary and an evaporator, and using a refrigeration oil and a refrigerant containing hydrofluorocarbon as a working medium.

[0002]

2. Description of the Related Art In recent years, in the field of refrigeration and air conditioning, chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) containing chlorine atoms such as dichlorodifluoromethane and chlorodifluoromethane, which have been used as refrigerants, have been used for stratospheric ozone. It was abolished due to the destruction of layers.

[0003] Accordingly, a hydrofluorocarbon (HFC) containing no chlorine atom has been used as an alternative refrigerant to these CFCs and HCFCs.

[0004] Further, HFC has high polarity and is incompatible with mineral oil which has been conventionally used as a refrigerating machine oil. Therefore, ester-based oils and ether-based oils having a polar group and having high compatibility with HFC have been applied or studied.

[0005] In the case of a refrigeration system that requires on-site construction work, such as an air conditioner, a vacuuming operation before charging the refrigerant is naturally performed on the site. However, in this evacuation operation, there is a difference in evacuation time, vacuum pump capacity, and the like depending on a contractor performing the operation, and at present, the degree of vacuum in the system is not controlled.

In a refrigeration system using HFC as a refrigerant and esters or ethers as a refrigerating machine oil, if the evacuation is insufficient and oxygen remains in the refrigeration system, various problems may occur in the system. Conceivable.

[0007] Oxygen remaining in the refrigeration system causes an oxidation reaction with ester-based oil or ether-based oil, and generates non-condensable gas such as carbon dioxide.

[0008] Further, the refrigerating machine oil is thermally oxidized and deteriorated by the influence of oxygen and heat, so that a decomposition product of the refrigerating machine oil insoluble in the refrigerant is generated.

When a non-condensable gas such as carbon dioxide is generated in a refrigeration system, the carbon dioxide or the like does not easily liquefy because of its low condensing temperature. There were problems such as a decrease in refrigeration capacity due to similar symptoms and an increase in the input of the compressor due to difficulty in compression.

Further, when a decomposition product of the refrigerating machine oil is generated, the polymer is clogged in the capillary, and there is a problem that the amount of circulating refrigerant is reduced and the refrigerating capacity is reduced.

In order to solve this problem, there has been proposed a refrigeration system in which an oxygen scavenger for reducing or removing oxygen in the refrigeration system is installed in system piping.

A conventional refrigeration system is disclosed in
There is one disclosed in Japanese Patent No. 302967.

Hereinafter, the conventional refrigeration system will be described with reference to the drawings. FIG. 5 is a pipeline diagram of a conventional refrigeration system. In FIG. 5, 1 is a compressor, 35 is a compressor 1
It is a mechanical part located inside. 31 is a compressor discharge section 36
Is a bypass circuit formed in parallel with the discharge line 37 immediately after. Reference numeral 32 denotes a second filter installed in the discharge bypass circuit 31, and reference numeral 33 denotes an oxygen scavenger fixed inside the second filter by a punch metal or a mesh.

As the oxygen scavenger 33, since the gas in question is oxygen, it is preferable to use an iron-based oxygen scavenger which has a large effect of removing oxygen even in the presence of chlorofluorocarbon.

Reference numeral 34 denotes an oil removal filter made of metal fibers provided below the oxygen absorber 33, and is fixed by a punch metal or a mesh.

Reference numeral 3 denotes a condenser. Reference numeral 38 denotes a first filter in which a desiccant 39 is fixed.

One end of the discharge bypass circuit 31 is provided between the condenser 3 and the first filter 38. Numeral 40 denotes an electromagnetic valve using a solenoid, and numeral 5 denotes an expansion valve or a capillary. 6 is an evaporator and 7 is an accumulator. 41 is a suction line and 42 is a check valve. 43 is a compressor suction part.

The operation of the refrigeration system configured as described above will be described below. The refrigerant 44 compressed by the mechanical unit 35 is discharged to the compressor discharge unit 36 in a gaseous state due to compression heat or the like generated at that time.
The discharged refrigerant 44 releases heat in the condenser 3 and gradually enters a gas-liquid mixed state, and finally liquefies.

Then, water is removed by a desiccant 39 fixed inside the first filter 38. The refrigerant 44 from which the water has been removed passes through the solenoid valve 40 that opens in synchronization with the operation of the compressor 1, and passes through the expansion valve or the capillary 5 while being depressurized. The depressurized refrigerant 44 expands in the evaporator 6 and removes heat from the surroundings. Then, the refrigerant 44 that has absorbed the heat
Is in a gaseous state, passes through the accumulator 7, the suction line 41, the check valve 42, and the compressor suction part 43, and
Return to Cooling is performed by this repetition.

When the refrigerant 44 is compressed by the mechanical unit 35, the refrigerating machine oil 4 is compressed by the heat of compression and the heat generated by the motor.
5 is heated. As a result, the oxygen dissolved in the refrigerating machine oil 45 moves into the refrigerant 44. The refrigerant 44 containing oxygen is discharged to the compressor discharge unit 36 in a gaseous state due to generated compression heat or the like. Most of the discharged refrigerant 44 passes through the discharge line 37 and the condenser 3
It flows to. Part of the refrigerant 44 flows to the discharge bypass circuit 31. Refrigerant 44 flowing to discharge bypass circuit 31
Passes through a second filter 32, at which time the oxygen contained in contact with the oxygen scavenger 33 is removed.

[0021]

However, in the above-mentioned conventional configuration, one of the discharge bypass circuits 31 provided with the oxygen absorber 33 is connected to the discharge line 37 and the other is connected to the condenser 3 and the first filter 38. Since both are high-pressure side pipes, there is almost no pressure difference between the inlet and outlet of the discharge bypass circuit 31. Therefore, there is a drawback that the refrigerant hardly flows through the second filter 32 provided in the discharge bypass circuit 31, and oxygen contained in the refrigerant cannot be almost removed.

SUMMARY OF THE INVENTION The present invention solves the conventional problems by rapidly and effectively reducing or removing oxygen present in a refrigeration system, and decomposing refrigeration oil, such as non-condensable gas such as carbon dioxide and refrigeration oil. It is an object of the present invention to provide a refrigeration system capable of preventing a reduction in capacity of a refrigeration system and an increase in input of a compressor due to generation of decomposition products.

Further, in the above-mentioned conventional configuration, since the refrigerant flow directly hits the oxygen absorber 33 installed in the second filter 32, the oxygen absorber 33 becomes powdered as the operation time elapses and the refrigerant is frozen. There is a drawback that it flows into the system and the expansion valve or the capillary 5 is clogged with the powder of the oxygen scavenger 33, which reduces the flow rate of the refrigerant 44 and reduces the capacity of the refrigeration system.

It is another object of the present invention to provide a refrigeration system that suppresses powdering of the oxygen scavenger and prevents deterioration in capacity due to blockage of an expansion valve or a capillary.

[0025]

SUMMARY OF THE INVENTION To solve this problem, the present invention provides a compressor, a condenser, an expansion valve or a capillary,
In a refrigeration system in which an evaporator and an accumulator are sequentially connected in a ring via a refrigerant pipe, and the refrigeration oil and a refrigerant containing hydrofluorocarbon are used as a working medium, the accumulator includes a container as a main body, and a container inside the container. A refrigerant introduction pipe for introducing refrigerant, a refrigerant discharge pipe for sending refrigerant to the compressor, and an opening above the refrigerant discharge pipe,
And a filter filled with an oxygen scavenger installed so as to partition the inside of the main body into two upper and lower spaces at a position where the working medium injected from the opening of the refrigerant introduction pipe does not directly collide. .

With this, even if oxygen is present in the refrigeration system, when oxygen is contained in the accumulator and injected into the working medium, the filter filled with the oxygen scavenger installed in the accumulator is used. Since oxygen is adsorbed, non-condensable gas such as carbon dioxide and decomposition of refrigerating machine oil due to thermal oxidative deterioration of the refrigerating machine oil do not occur, and a decrease in refrigerating capacity and an increase in compressor input can be prevented. In addition, the oxygen scavenger is installed at a position where the working medium injected from the refrigerant inlet pipe of the accumulator does not directly collide, and the oxygen scavenger does not powder, so the capacity of the refrigeration system due to the blockage of the expansion valve or the capillary is reduced. Drop can be prevented.

Further, in order to solve this problem, the present invention provides:
A filter filled with an oxygen scavenger installed in a form that partitions the inside of the accumulator body into two
It is provided with more than two communication openings.

Thus, even if oxygen is present in the refrigeration system, the filter filled with the deoxidizer in the accumulator has one or more communicating openings, and is connected to the working medium containing oxygen. Since the contact area is large, oxygen is more efficiently adsorbed than when there is no communication opening. Therefore, generation of non-condensable gas such as carbon dioxide and refrigerating machine oil decomposition products due to thermal oxidation deterioration of the refrigerating machine oil does not occur, and a decrease in refrigerating capacity and an increase in compressor input can be prevented. In addition, the oxygen scavenger is installed at a position where the working medium injected from the refrigerant inlet pipe of the accumulator does not directly collide, and the oxygen scavenger does not powder, so the capacity of the refrigeration system due to the blockage of the expansion valve or the capillary is reduced. Drop can be prevented.

Further, in order to solve this problem, the present invention provides:
In the main body of the accumulator, which is divided into the upper and lower spaces by the filter, the opening of the refrigerant outlet pipe is installed in the upper space of the main body, and the opening of the refrigerant inlet pipe is injected into the lower space of the main body from the refrigerant inlet pipe. The working medium is installed so that it does not collide directly.

Thus, even when oxygen is present in the refrigeration system, when the working medium containing oxygen is injected from the refrigerant introduction pipe and flows out of the refrigerant discharge pipe, the filter filled with the oxygen absorber must be used. pass. Therefore, the oxygen contained in the working medium is reliably and quickly adsorbed to the oxygen scavenger, so that non-condensable gas such as carbon dioxide and refrigerating machine oil decomposition products due to thermal oxidation deterioration of the refrigerating machine oil do not occur, It is possible to prevent a decrease in refrigeration capacity and an increase in compressor input. Also, the working medium injected from the refrigerant inlet pipe of the accumulator does not directly collide with the filter, once diffuses into the accumulator, passes through the filter, and flows out of the refrigerant outlet pipe, so that powdering of the oxygen scavenger does not occur. It is possible to prevent a decrease in the capacity of the refrigeration system due to blockage of the expansion valve or the capillary.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first aspect of the present invention, a compressor, a condenser, an expansion valve or a capillary, an evaporator, and an accumulator are sequentially connected in a ring through a refrigerant pipe, and the refrigerant oil and the refrigerant oil are connected. In a refrigeration system using a refrigerant containing hydrofluorocarbon as a working medium, the accumulator includes a container that is a main body, a refrigerant introduction pipe that introduces a refrigerant into the container, and a refrigerant discharge pipe that sends a refrigerant to the compressor. A deoxygenation device which is installed above the opening of the refrigerant outlet tube and at a position where the working medium injected from the opening of the refrigerant inlet tube does not directly collide with the inside of the main body into two upper and lower spaces. It is provided with a filter filled with the agent.

Even when oxygen is mixed into the refrigerating system due to insufficient evacuation and is dissolved in the refrigerating machine oil, the refrigerating machine oil is heated by the heat of compression or heat generated by the motor during the operation of the compressor and dissolved in the refrigerating machine oil. The oxygen that has been transferred to the refrigerant, which is the working medium. The working medium containing oxygen circulates in the refrigerating system together with a part of the refrigerating machine oil, and is injected into an accumulator which is a gas-liquid separating means and in which a filter filled with an oxygen scavenger is installed. In the injected working medium, the liquid-phase refrigerant and the refrigerating machine oil stay at the lower portion along the inner wall of the accumulator, and only the gas-phase refrigerant flows out of the accumulator. Since the filter filled with the oxygen scavenger is installed in the gaseous atmosphere of the accumulator, the oxygen contained in the gaseous refrigerant is adsorbed by the oxygen scavenger and only the gaseous refrigerant returns to the compressor. Have.

The filter filled with the oxygen scavenger is installed at a position where the working medium injected from the refrigerant introduction pipe of the accumulator does not directly collide, and is broken by the influence of the working medium injected with the oxygen scavenger. This has the effect that the refrigerating machine oil does not adhere to the oxygen scavenger.

According to a second aspect of the present invention, in the accumulator according to the first aspect of the present invention, the filter filled with an oxygen scavenger, which is installed so as to partition the interior of the accumulator into two upper and lower spaces, is provided. It is provided with more than two communication openings.

Even when oxygen is mixed into the refrigeration system due to insufficient vacuuming and is dissolved in the refrigerating machine oil, the refrigerating machine oil is heated by the heat of compression and heat generated by the motor during the operation of the compressor and dissolved in the refrigerating machine oil. The oxygen that has been transferred to the refrigerant, which is the working medium. The working medium containing oxygen circulates in the refrigerating system together with a part of the refrigerating machine oil, and is injected into an accumulator which is a gas-liquid separating means and in which a filter filled with an oxygen scavenger is installed. In the injected working medium, the liquid-phase refrigerant and the refrigerating machine oil stay at the lower portion along the inner wall of the accumulator, and only the gas-phase refrigerant flows out of the accumulator. Since the filter filled with the oxygen scavenger is installed in the gas phase atmosphere of the accumulator and has one or more communication openings, the contact area between the gas phase refrigerant containing oxygen and the oxygen scavenger is It becomes wider and oxygen is more efficiently adsorbed than when there is no communication opening, so that only the gas-phase refrigerant returns to the compressor.

The filter filled with the oxygen scavenger is installed at a position where the working medium injected from the refrigerant introduction pipe of the accumulator does not directly collide, and is broken by the influence of the working medium injected with the oxygen scavenger. This has the effect that the refrigerating machine oil does not adhere to the oxygen scavenger.

According to a third aspect of the present invention, in the accumulator according to the first aspect of the present invention, the opening of the refrigerant outlet pipe is formed in the main body of the accumulator which is partitioned into two upper and lower spaces by the filter. It is installed in the inner upper space, and the opening of the refrigerant introduction pipe is installed so that the working medium injected from the refrigerant introduction pipe into the lower space in the main body does not directly collide.

[0038] Even when oxygen is mixed into the refrigerating system due to insufficient evacuation and dissolved in the refrigerating machine oil, the refrigerating machine oil is heated by the heat of compression or heat generated by the motor during the operation of the compressor and dissolved in the refrigerating machine oil. The oxygen that has been transferred to the refrigerant, which is the working medium. The working medium containing oxygen circulates in the refrigerating system together with a part of the refrigerating machine oil, and is injected into an accumulator which is a gas-liquid separating means and in which a filter filled with an oxygen scavenger is installed. In the injected working medium, the liquid-phase refrigerant and the refrigerating machine oil stay at the lower portion along the inner wall of the accumulator, and only the gas-phase refrigerant flows out of the accumulator. In the main body of the accumulator, which is divided into two upper and lower spaces by a filter filled with a deoxidizer, the opening of the refrigerant outlet pipe is installed in the upper space in the main body, and the opening of the refrigerant inlet pipe is Since it is installed in the lower part of the body, the gas-phase refrigerant always passes through the filter filled with the oxygen scavenger, and the oxygen contained in the gas-phase refrigerant is reliably and quickly adsorbed, and only the gas-phase refrigerant is compressed. It has the effect of returning to the machine.

The filter filled with the oxygen scavenger is installed at a position where the working medium injected from the refrigerant introduction pipe of the accumulator does not directly collide, and is broken by the influence of the working medium injected with the oxygen scavenger. This has the effect that the refrigerating machine oil does not adhere to the oxygen scavenger.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a refrigeration system according to the present invention will be described below with reference to the drawings. The same components as those of the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a pipeline diagram of a refrigeration system according to Embodiment 1 of the present invention.

FIG. 1 shows a refrigeration system used in a general air conditioner. Reference numeral 1 denotes a compressor, in which a refrigerant 44 and a refrigerating machine oil 45 are sealed.

The refrigerant 44 is a refrigerant containing hydrofluorocarbon, and the refrigerating machine oil 45 is, for example, an ester or ether refrigerating machine oil in consideration of compatibility with the refrigerant 44.

2 is a four-way valve, 3 is a condenser, 4 is a desiccant, 5
Is an expansion valve or capillary, 6 is an evaporator, and 7 is an accumulator. In this refrigeration system, the functions of the condenser 3 and the evaporator 6 can be exchanged as needed by switching the four-way valve 2 to perform cooling and heating operations.

FIG. 2 is a sectional view of the accumulator 7 main body. The accumulator 7 main body has a configuration in which the upper and lower ends of a body 8 are closed by an upper end plate 9 and a lower end plate 10.

Reference numeral 11 denotes a refrigerant introduction pipe, and reference numeral 12 denotes a refrigerant discharge pipe, which are connected to the upper head plate 9 by means such as welding. However, the connection position is not limited at all.
Further, the opening at the distal end of the refrigerant introduction pipe 11 is bent toward the inner wall of the body 8 in order to centrifuge the refrigerant 44 serving as the working medium and the gas phase liquid phase of the refrigerating machine oil 45.

Reference numeral 13 is an oil return port. The oil return port 13 is for returning the refrigerating machine oil 45 accumulated in the lower part of the accumulator 7 to the compressor, and is provided in the refrigerant outlet pipe 12 corresponding to the bottom surface of the accumulator 7.

Reference numeral 14 denotes an oxygen scavenger, and 15 denotes a metal mesh. The mesh 15 has a circular shape, and the diameter of the mesh 15 is the same as the inner diameter of the accumulator 7. The mesh 15 divides the inside of the accumulator 7 body into two upper and lower spaces at a position above the opening of the refrigerant outlet pipe 12 in the accumulator 7 and at a position where the working medium injected from the opening of the refrigerant inlet pipe 11 does not directly collide. It is installed in the form. The oxygen scavenger 14 has two meshes 1
5 to form a filter 16.

The oxygen scavenger 14 is preferably an iron-based reactive oxygen scavenger having a large oxygen removing effect even in the presence of chlorofluorocarbon. Specifically, Ageless (manufactured by Mitsubishi Gas Chemical Company), which is excellent in removing oxygen, is suitable. The mesh 1
It is more preferable that the connection support means for installing 5 is provided with a vibration absorbing function.

The operation of the refrigeration system configured as described above will be described below. Even if a large amount of oxygen is mixed into the refrigeration system due to insufficient evacuation or the like and dissolved in the refrigeration oil 45, the refrigeration oil 45 is heated by the compression heat during the operation of the compressor 1 or the heat generated by the motor. The dissolved oxygen moves to the refrigerant 44 as the working medium.

The refrigerant 4 as the working medium containing oxygen
4 circulates in the refrigerating system together with a part of the refrigerating machine oil 45 and is injected from the refrigerant introduction pipe 11 into the accumulator 7 which is a gas-liquid separating means and in which the filter 16 filled with the oxygen scavenger 14 is installed.

Since the opening of the distal end of the refrigerant introduction pipe 11 is bent toward the body 8 so as to cause centrifugal separation, the liquid refrigerant 44 and the refrigerating machine oil 45 of the injected working medium are stored in the accumulator. Staying at the bottom along the inner wall of 7,
Only the gas-phase refrigerant 44 flows out of the refrigerant outlet pipe 12. The filter 16 filled with the oxygen scavenger 14 is connected to the accumulator 7.
Is installed in the atmosphere of the gaseous refrigerant 44, the oxygen contained in the gaseous refrigerant 44 is adsorbed by the oxygen absorber 14 when the refrigerant 44 contacts the filter 16, and only the gaseous refrigerant 44 is supplied to the compressor. Return to

The filter 1 filled with the oxygen scavenger 14
6 is installed above the opening of the refrigerant introduction pipe 11 of the accumulator 7 and does not directly collide with the working medium to be injected, so that the oxygen absorber 14 is not damaged by the influence of the working medium to be injected, and Further, the refrigerator oil 45 does not adhere to the oxygen absorber 14.

As described above, the refrigeration system of this embodiment
The compressor 1, the condenser 3, the expansion valve or the capillary 4, the evaporator 6, and the accumulator 7 are sequentially connected in a ring via a refrigerant pipe, and the refrigeration oil 45 and the refrigerant 44 containing hydrofluorocarbon are used as a working medium. In the system, the accumulator 7 includes a container as a main body, a refrigerant introduction pipe 11 for introducing the refrigerant 44 into the container, a refrigerant discharge pipe 12 for sending the refrigerant 44 to the compressor 1, and a refrigerant discharge pipe 12. Is filled with an oxygen absorber 14 installed above the opening of the refrigerant introduction pipe 11 so as to divide the inside of the main body into two upper and lower spaces at a position where the working medium injected from the opening of the refrigerant introduction pipe 11 does not directly collide. This is provided with a filter 16 as described above.

Therefore, even if oxygen is present in the refrigeration system, when oxygen is contained in the accumulator 7 and injected into the working medium, the filter filled with the oxygen absorber 14 installed in the accumulator 7 is used. Since 16 adsorbs oxygen, non-condensable gas such as carbon dioxide or the decomposition product of refrigerating machine oil 45 due to thermal oxidative deterioration of refrigerating machine oil 45 does not occur, preventing a decrease in refrigerating capacity and an increase in input of compressor 1. be able to.

The deoxidizer 14 is installed at a position where the working medium injected from the refrigerant introduction pipe 11 of the accumulator 7 does not directly collide, and the deoxidizer 14 is not powdered. Therefore, the expansion valve or the capillary 4 is not used. Of the refrigeration system due to blockage of the refrigeration system can be prevented. Further, since the refrigerating machine oil 45 does not adhere to the oxygen absorber 14, the effect of adsorbing oxygen is not reduced.

(Embodiment 2) FIG. 3 is a sectional view of an accumulator according to Embodiment 2 of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 3, reference numeral 17 denotes a communication opening.
An opening for refrigerant communication provided at one or more locations in the filter 16 filled with the oxygen scavenger 14.

The operation of the gas-liquid separator configured as described above will be described below. Even if a large amount of oxygen is mixed into the refrigeration system due to insufficient evacuation or the like and dissolved in the refrigeration oil 45, the refrigeration oil 45 is heated by the compression heat during the operation of the compressor 1 or the heat generated by the motor. The dissolved oxygen moves to the refrigerant 44 as the working medium.

Refrigerant 4 as the working medium containing oxygen
4 circulates in the refrigerating system together with a part of the refrigerating machine oil 45 and is injected from the refrigerant introduction pipe 11 into the accumulator 7 which is a gas-liquid separating means and in which the filter 16 filled with the oxygen scavenger 14 is installed.

Since the opening at the distal end of the refrigerant introduction pipe 11 is bent toward the body 8 so as to cause centrifugal separation, the liquid refrigerant 44 and the refrigerating machine oil 45 of the injected working medium are stored in the accumulator. Staying at the bottom along the inner wall of 7,
Only the gas-phase refrigerant 44 flows out of the refrigerant outlet pipe 12. The filter 16 filled with the oxygen scavenger 14 is connected to the accumulator 7.
Is installed in the atmosphere of the gas-phase refrigerant 44 and at least one communication opening 17 is provided.
The contact area between the filter 4 and the filter 16 is larger than when the communication opening 17 is not provided. Therefore, oxygen contained in the gas-phase refrigerant 44 is more efficiently adsorbed by the oxygen absorber 14, and only the gas-phase refrigerant 44 returns to the compressor.

The filter 1 filled with the oxygen scavenger 14
6 is installed above the opening of the refrigerant introduction pipe 11 of the accumulator 7 and does not directly collide with the working medium to be injected, so that the oxygen absorber 14 is not damaged by the influence of the working medium to be injected, and Further, the refrigerator oil 45 does not adhere to the oxygen absorber 14.

As described above, the refrigeration system of this embodiment
A filter 16 filled with a deoxidizer 14 installed in such a manner as to partition the inside of the main body of the accumulator 7 into two upper and lower spaces is provided with one or more communication openings 17. Therefore, even if oxygen is present in the refrigeration system, the filter 16 filled with the deoxidizer in the accumulator 7
Since it has one or more communication openings 17 and has a large contact area with the working medium containing oxygen, oxygen is more efficiently adsorbed than without the communication openings 17.

For this reason, non-condensable gas such as carbon dioxide due to thermal oxidation deterioration of the refrigerating machine oil 45 or the refrigerating machine oil 45
The generation of decomposition products does not occur, and a decrease in refrigeration capacity and an increase in input of the compressor 1 can be prevented.

Further, the oxygen scavenger 14 is installed at a position where the working medium injected from the refrigerant introduction pipe of the accumulator 7 does not directly collide, and the oxygen scavenger 14 is not powdered.
It is possible to prevent the performance of the refrigeration system from lowering due to the blockage of the expansion valve or the capillary 4. Further, since the refrigerating machine oil 45 does not adhere to the oxygen absorber 14, the effect of adsorbing oxygen is not reduced.

(Embodiment 3) FIG. 4 is a sectional view of a gas-liquid separator according to Embodiment 3 of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 4, in the accumulator 7 partitioned into two upper and lower spaces by the filter 16 filled with the oxygen scavenger 14, the opening of the refrigerant outlet pipe 12 is installed in the upper space in the accumulator 7. The opening of the refrigerant introduction pipe 11 is provided in such a manner that the working medium injected from the refrigerant introduction pipe 11 does not directly collide with the lower space inside the accumulator 7.

With the above configuration, the gas-phase refrigerant 44 in the working medium injected from the refrigerant introduction pipe 11 in the accumulator 7 main body must pass through the filter 16 when flowing out from the refrigerant discharge pipe 12 to the compressor 1. Become.

The operation of the refrigeration system configured as described above will be described below. Even if a large amount of oxygen is mixed into the refrigeration system due to insufficient evacuation or the like and dissolved in the refrigeration oil 45, the refrigeration oil 45 is heated by the compression heat during the operation of the compressor 1 or the heat generated by the motor. The dissolved oxygen moves to the refrigerant 44 as the working medium.

The working medium containing oxygen, refrigerant 4
4 circulates in the refrigerating system together with a part of the refrigerating machine oil 45 and is injected from the refrigerant introduction pipe 11 into the accumulator 7 which is a gas-liquid separating means and in which the filter 16 filled with the oxygen scavenger 14 is installed.

Since the opening at the distal end of the refrigerant introduction pipe 11 is bent toward the body 8 so as to cause centrifugal separation, the liquid-phase refrigerant 44 and the refrigerating machine oil 45 of the injected working medium are accumulated in the accumulator. Staying at the bottom along the inner wall of 7,
Only the gas-phase refrigerant 44 flows out of the refrigerant outlet pipe 12. In the accumulator 7 which is divided into two lower and upper spaces by a filter 16 filled with an oxygen absorber 14, the opening of the refrigerant outlet pipe 12 is provided in the upper space of the accumulator 7, and the opening of the refrigerant inlet pipe 11 Is installed in the lower space in the accumulator 7, so that the refrigerant outlet pipe 1
When flowing out of the second opening, the gaseous refrigerant 44 always passes through the filter 16. Therefore, the oxygen contained in the gaseous refrigerant 44 is reliably and quickly adsorbed by the oxygen scavenger.

The filter 1 filled with the oxygen scavenger 14
6 is installed at a position where the working medium injected from the opening of the refrigerant introduction pipe 11 of the accumulator 7 does not directly collide,
The refrigerant 45 as the working medium to be injected once diffuses in the accumulator 7, passes through the filter 16, and is not affected by the flow rate of the refrigerant 44, so that the oxygen absorber 14 is not damaged, and furthermore, the refrigerating machine oil 45 does not adhere to the oxygen scavenger 14.

As described above, the refrigeration cycle of the present embodiment
In the main body of the accumulator 7 which is divided into two upper and lower spaces by the filter 16, the refrigerant outlet pipe 12
Of the refrigerant introduction pipe 11
Are provided in such a manner that the working medium injected from the refrigerant introduction pipe 11 does not directly collide with the lower space in the main body.

Therefore, even if oxygen exists in the refrigeration system, when the working medium containing oxygen is injected from the refrigerant introduction pipe 11 and flows out of the refrigerant discharge pipe 12, the deoxidizer 1
4 pass through a filter 16 filled with it. Therefore, the oxygen contained in the working medium is reliably and quickly adsorbed to the oxygen scavenger 14, so that the non-condensable gas such as carbon dioxide and the decomposition products of the refrigerating machine oil 45 due to the thermal oxidative deterioration of the refrigerating machine oil 45 are reduced. This does not occur, and it is possible to prevent a decrease in refrigeration capacity and an increase in input of the compressor 1.

The refrigerant introduction pipe 11 of the accumulator 7
The working medium injected more does not directly collide with the filter 16,
Once diffused into the accumulator 7, it passes through the filter 16 and flows out of the refrigerant outlet pipe 12, so that the oxygen scavenger 14 does not pulverize, preventing the refrigeration system from deteriorating due to blockage of the expansion valve or the capillary 4. Can be. Further, since the refrigerating machine oil 45 does not adhere to the oxygen absorber 14, the effect of adsorbing oxygen is not reduced.

[0076]

As described above, according to the first aspect of the present invention, a compressor, a condenser, an expansion valve or a capillary, an evaporator, and an accumulator are sequentially connected in a ring through a refrigerant pipe, and the refrigerant oil is connected to the compressor. In a refrigeration system using a refrigerant containing hydrofluorocarbon as a working medium, the accumulator includes a container that is a main body, a refrigerant introduction pipe that introduces a refrigerant into the container, and a refrigerant discharge pipe that sends a refrigerant to the compressor. A deoxygenation device which is installed above the opening of the refrigerant outlet tube and at a position where the working medium injected from the opening of the refrigerant inlet tube does not directly collide with the inside of the main body into two upper and lower spaces. It is provided with a filter filled with the agent.

Therefore, even if oxygen is present in the refrigeration system, when oxygen is contained in the working medium and injected into the accumulator, the filter filled with a deoxidizer installed in the accumulator removes oxygen. Because of the adsorption, non-condensable gas such as carbon dioxide and refrigerating oil decomposed products due to thermal oxidative deterioration of the refrigerating oil do not occur, and a decrease in refrigerating capacity and an increase in compressor input can be prevented.

Further, the oxygen scavenger is installed at a position where the working medium injected from the refrigerant inlet pipe of the accumulator does not directly collide, and the oxygen scavenger does not pulverize. Therefore, the refrigeration system by closing the expansion valve or the capillary. Can be prevented from decreasing.

Furthermore, since the refrigerating machine oil does not adhere to the oxygen scavenger, the effect of adsorbing oxygen is not reduced.

The invention according to claim 2 of the present invention provides
A filter filled with an oxygen scavenger installed in a form that partitions the inside of the accumulator body into two
It is provided with more than two communication openings.

Therefore, even if oxygen is present in the refrigeration system, the filter filled with the deoxidizer in the accumulator has one or more communicating openings, and has a contact area with the working medium containing oxygen. , The oxygen is more efficiently adsorbed than when there is no communication opening. Therefore, generation of non-condensable gas such as carbon dioxide and refrigerating machine oil decomposition products due to thermal oxidation deterioration of the refrigerating machine oil does not occur, and a decrease in refrigerating capacity and an increase in compressor input can be prevented.

Further, since the oxygen scavenger is installed at a position where the working medium injected from the refrigerant introduction pipe of the accumulator does not directly collide with the oxygen scavenger and the oxygen scavenger does not become powdered, the refrigeration system due to the blockage of the expansion valve or the capillary. Can be prevented from decreasing.

Further, since the refrigerating machine oil does not adhere to the oxygen scavenger, the effect of adsorbing oxygen is not reduced.

The invention according to claim 3 of the present invention provides
In the main body of the accumulator, which is divided into the upper and lower spaces by the filter, the opening of the refrigerant outlet pipe is installed in the upper space of the main body, and the opening of the refrigerant inlet pipe is injected into the lower space of the main body from the refrigerant inlet pipe. The working medium is installed so that it does not collide directly.

Therefore, even if oxygen is present in the refrigeration system, when the working medium containing oxygen is injected from the refrigerant introduction pipe and flows out of the refrigerant discharge pipe, it always passes through the filter filled with the oxygen scavenger. . Therefore, the oxygen contained in the working medium is reliably and quickly adsorbed to the oxygen scavenger, so that non-condensable gas such as carbon dioxide and refrigerating machine oil decomposition products due to thermal oxidation deterioration of the refrigerating machine oil do not occur, It is possible to prevent a decrease in refrigeration capacity and an increase in compressor input.

The working medium injected from the refrigerant inlet pipe of the accumulator does not directly collide with the filter, but once diffuses into the accumulator 7, passes through the filter, and flows out of the refrigerant outlet pipe, so that the deoxidizer is pulverized. Does not occur, and a decrease in the capacity of the refrigeration system due to blockage of the expansion valve or the capillary can be prevented.

Further, since the refrigerating machine oil does not adhere to the oxygen scavenger, the effect of adsorbing oxygen is not reduced.

[Brief description of the drawings]

FIG. 1 is a pipeline diagram of a refrigeration system according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the accumulator according to the embodiment.

FIG. 3 is a sectional view of an accumulator according to a second embodiment of the present invention.

FIG. 4 is a sectional view of an accumulator according to a third embodiment of the present invention.

FIG. 5 is a pipeline diagram of a conventional refrigeration system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 3 Condenser 5 Expansion valve or capillary 6 Evaporator 7 Accumulator 11 Refrigerant introduction pipe 12 Refrigerant introduction pipe 14 Deoxidizer 16 Filter 17 Communication opening 44 Refrigerant 45 Refrigeration oil

Claims (3)

[Claims] 1. A refrigerating system in which a compressor, a condenser, an expansion valve or a capillary, an evaporator, and an accumulator are sequentially connected in a ring via a refrigerant pipe, and a refrigerating machine oil and a refrigerant containing hydrofluorocarbon are used as a working medium. The accumulator is a container that is a main body, a refrigerant introduction pipe that introduces refrigerant into the container, a refrigerant discharge pipe that sends refrigerant to the compressor, and an opening above the refrigerant discharge pipe, and the refrigerant A refrigeration system comprising a filter filled with an oxygen scavenger installed in such a manner that the inside of the main body is partitioned into two upper and lower spaces at a position where the working medium injected from the opening of the introduction pipe does not directly collide. system. 2. A filter filled with a deoxidizer, which is provided so as to partition the inside of the main body of the accumulator into two upper and lower spaces, and is provided with one or more communication openings. Refrigeration system as described. 3. An accumulator main body divided into upper and lower two spaces by a filter, wherein an opening of a refrigerant outlet pipe is provided in an upper space in the main body, and an opening of a refrigerant introduction pipe is provided in a lower space in the main body. The refrigeration system according to claim 1, wherein the working medium injected from the introduction pipe is installed so as not to directly collide.