JPH08210738A - Cooling system - Google Patents

Abstract

PURPOSE: To provide a cooling system which is constituted to reduce the decrease of a flow rate of a refrigerant and refrigerating machine oil and prevent the occurrence of defective cooling even when various reaction substances produced from reaction between a foreign matter in a cooling system and ester refrigerating machine oil is adhered to a capillary tube. CONSTITUTION: A cooling system comprises a refrigerant 12, ester refrigerating machine oil 13, a compressor 1 filled with the oil 13, a condenser 2 connected to the compressor 1, a drier 3, a capillary tube 10, a vaporizer 9, and an intake pipe 6. An expansion pipe having an inside diameter increased to a value higher than a given value is arranged at the capillary tube 10 connected to the vaporizer 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system used in refrigerators, freezers and the like.

[0002]

2. Description of the Related Art In recent years, chlorofluorocarbons (hereinafter C
Environmental problems such as ozone depletion and global warming due to the influence of FC) are drawing attention. Dichlorodifluoroethane, which is a typical CFC refrigerant, is replaced with 1,1,1,2-tetrafluoroethane (hereinafter referred to as HFC-134a), which is a halogenated carbon compound containing two hydrogens, which has little effect on ozone layer depletion. Various improvement efforts have been made to achieve this.

As a conventional cooling system, Jitsuko Sho 54-
There is one disclosed in Japanese Patent No. 31402.

This conventional example will be described below with reference to FIGS. 8 and 9. FIG. 8 is a piping diagram of a conventional cooling system. FIG. 9 is an enlarged sectional view of a connecting portion between an evaporator and a capillary tube of a conventional cooling system.

In the figure, 1 is a compressor, 2 is a condenser, 3
Is a drier, 4 is a capillary, 5 is an evaporator, 6 is a suction pipe, 7 is a refrigerant, and 8 is refrigerating machine oil. As shown in FIG. 9, the capillary tube 4 is inserted into the evaporator 5. These refrigerating elements are continuously sealed by a copper pipe or the like, and the refrigerant 7 and the refrigerating machine oil 8 are enclosed to form a cooling system.

The operation of the cooling system configured as above will be described. Refrigerant 7 compressed by the compressor 1
Is discharged in a gas phase state due to the compression heat generated at that time, and heat is released by the condenser 2 to gradually become a gas-liquid mixed state and finally liquefied.

The liquefied refrigerant 7 is depressurized by the capillary tube 4 after removing water by the dryer 3. The depressurized refrigerant 7 expands in the evaporator 5 to remove heat from the surroundings. The refrigerant 6 that has absorbed the heat becomes a gas phase state and returns to the compressor 1 to repeat the cycle.

[0008]

However, in the cooling system configured as described above, if HFC134a is used as a refrigerant or ester-based oil is used as a refrigerating machine oil in order to prevent ozone layer depletion, they are mixed in the system. The foreign matter, moisture, etc. react with the ester oil to produce various reaction products.

The reactant flows through the system together with the refrigerant, but adheres to the inner surface of the inlet of the capillary 4 where the pressure is sharply reduced, and the liquefied refrigerant decompressed by the capillary 4 rapidly evaporates when it exits the capillary 4. Therefore, it may separate from various reactants and adhere to the inner surface of the outlet of the capillary tube 4 to reduce the flow rates of the refrigerant and the refrigerating machine oil, possibly causing cooling failure.

The present invention has been made to solve the conventional problems, and provides a cooling system in which even if various reactants adhere to the capillaries, the decrease in the flow rates of the refrigerant and the refrigerating machine oil is reduced, and no cooling failure occurs. The purpose is to do.

Another object of the present invention is to provide a cooling system in which various reactants are less likely to adhere to the capillaries.

[0012]

To achieve this object, a cooling system of the present invention comprises a refrigerant, a refrigerating machine oil, a compressor enclosing the refrigerating machine oil, and a condenser connected to the compressor. The dryer, the capillary tube, the evaporator, and the suction tube are provided, and the capillary tube on the side connected to the evaporator is provided with an expanding portion having a diameter larger than a predetermined inner diameter.

Further, the capillaries connected to the drier and the evaporator are provided with expanding portions in which both ends are larger than a predetermined inner diameter.

Further, a refrigerant, a refrigerating machine oil, a compressor enclosing the refrigerating machine oil, a condenser connected to the compressor, a drier, a capillary tube, a suction tube, and two sheets of aluminum or the like. A refrigerant passage formed between the plates is provided, the suction pipe is connected to the outlet side opening end of the refrigerant passage, the capillary tube is inserted into the suction pipe to open to the inlet of the refrigerant passage, and The evaporator comprises a single inlet type evaporator in which the capillary is fixed to a narrow portion formed near the opening end, and the cross section of the inlet of the refrigerant passage opening the capillary is gradually changed.

[0015]

In the cooling system of the present invention having the above-mentioned configuration, foreign substances and water mixed in the system react with ester oil to produce various reaction products, and the reaction products are refrigerants in the system. Although it flows along with it, the liquefied refrigerant decompressed by the capillary tube evaporates rapidly when it exits the capillary tube, so it separates from various reactants and various reactants adhere to the inner surface of the capillary outlet, but the outlet of the capillary tube Since the expanded tube portion having a diameter larger than the predetermined inner diameter is provided, the predetermined inner diameter of the capillary tube can be secured even if it adheres to the inner surface of the expanded tube portion, and the flow rate of the refrigerant and the refrigerating machine oil can be prevented from decreasing.

Further, various reactants adhere to the inner surfaces of the inlet and outlet of the capillary tube, but since both ends of the capillary tube are provided with expanding portions larger than a predetermined inner diameter, even if they adhere to the inner surface of the expanding portion, the capillary tube It is possible to secure a predetermined inner diameter of, and it is possible to prevent the flow rates of the refrigerant and the refrigerating machine oil from decreasing.

Further, since the cross section of the inlet portion of the refrigerant passage in which the capillary tube is opened is gradually changed, the liquefied refrigerant is gradually evaporated, whereby the separation of the refrigerant and various reactants is suppressed, and the capillary tube Adhesion to the inner surface of the outlet can be suppressed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a cooling system according to the present invention will be described below with reference to the drawings. The same components as those of the conventional one are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a piping diagram of a cooling system according to a first embodiment of the present invention. FIG. 2 is a front view showing the connected state of the evaporator and the capillary tube of the same embodiment. FIG. 3 is an enlarged cross-sectional view of the main part of FIG.

In the figure, 1 is a compressor, 2 is a condenser, and 3
Is a dryer, 9 is an evaporator, and 6 is a suction pipe. Reference numeral 10 denotes a capillary tube, which is provided with an expanded tube portion 11 whose side connected to the evaporator 9 is larger than a predetermined inner diameter.

These refrigerating elements are continuously sealed by a copper pipe or the like, and the refrigerant 12 using HFC-134a and the ester type refrigerating machine oil 13 are enclosed to form a cooling system.

The operation of the cooling system having the above structure will be described below. The refrigerant 12 compressed by the compressor 1 is discharged in a gas phase due to the compression heat or the like generated at that time, and the condenser 2 releases heat to gradually become a gas-liquid mixed state and finally liquefy. Liquefied refrigerant 12
After the water is removed by the dryer 3, the pressure is reduced by the capillary tube 10. The depressurized refrigerant 12 expands in the evaporator 9 and takes heat from the surroundings. The refrigerant 12 that has absorbed the heat enters the gas phase state and returns to the compressor 1 to repeat the cycle.

In this cycle, foreign substances, water and the like mixed in the cooling system react with the ester type refrigerating machine oil 13 to produce various reactants 14, and the reactant 14
Flows through the system together with the refrigerant 12, but the liquefied refrigerant 12 decompressed by the capillary 10 abruptly evaporates at the exit of the capillary 10 and thus separates from various reactants 14 to form an inner surface of the expanded portion 11 of the capillary 10. Various reactants 14
Adheres.

However, since the outlet portion of the capillary tube 10 of this embodiment is provided with the expanded tube portion 11 having a larger inner diameter than the predetermined inner diameter, the predetermined inner diameter of the capillary tube 10 can be secured even if it adheres to the inner surface of the expanded tube portion 11, and the refrigerant 12 Also, it is possible to prevent the flow rate of the refrigerating machine oil 13 from decreasing.

Next, a second embodiment will be described with reference to FIGS. 4 and 5. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 is a front view showing the connected state of the capillaries according to the second embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view of the main part of FIG.

In the figure, 15 is a dryer and 16 is an evaporator. Reference numeral 17 denotes a capillary tube, which is provided at both ends with expanded tube portions 18a and 18b larger than a predetermined inner diameter, one expanded tube portion 18a is connected to the dryer 15, and the other expanded tube portion 18b is connected to the evaporator 16 to form a cooling system. I am configuring.

The reaction product formed by the reaction of the ester-type refrigerating machine oil 13 with the foreign substances and water mixed in the cooling system is not limited to the outlet of the capillary 17, but also the inlet of the capillary 17 where the pressure reduction of the refrigerant 12 starts. Also adheres to.

However, since both ends of the capillary tube 17 of this embodiment are provided with the expanded tube portions 18a and 18b having a larger inner diameter than the predetermined inner diameter, the predetermined inner diameter of the capillary tube 17 can be secured even if they adhere to the inner surfaces of the expanded tube portions 18a and 18b. It is possible to prevent the flow rates of the refrigerant 12 and the refrigerating machine oil 13 from decreasing.

Next, a third embodiment will be described with reference to FIGS. 6 and 7. The same components as those in the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 6 is a partial front view of an evaporator according to the third embodiment of the present invention. FIG. 7 is an enlarged cross-sectional view of the main part of FIG.

In the figure, 19 is a capillary tube and 20 is a suction tube. Reference numeral 21 is an evaporator, which applies a release material for preventing pressure bonding between two aluminum or stainless steel plates and rolls it, and then inflates the release material application portion with high pressure air or the like to form a refrigerant passage 22. There is.

The evaporator 21 has a narrow portion 24 close to the outlet side opening end 23 of the refrigerant passage 22, and the opening end 2
A refrigerant return passage 25 is formed between the narrow portion 3 and the narrow portion 3.

A suction pipe 20 containing a capillary tube 19 is connected to the opening end 21, and only the capillary tube 19 passes through the narrow portion 24 and is fixed and opened at the inlet portion 26 of the refrigerant passage 22 to form the single inlet type evaporator 21. Is formed. The inlet portion 26 of the refrigerant passage 22 has a configuration in which the cross section is gradually changed.

In the cooling system configured as described above, the inlet portion 26 of the refrigerant passage 22 communicating with the capillary tube 19
Since the cross section of the liquefied refrigerant is gradually changed,
Is gradually evaporated, so that separation from various reactants 14 is suppressed, adhesion of the reactant 14 to the inner surface of the outlet portion of the capillary tube 19 can be suppressed, and decrease in the flow rates of the refrigerant and the refrigerating machine oil can be suppressed. be able to.

[0036]

As described above, the present invention provides a refrigerant,
Refrigerating machine oil, a compressor enclosing the refrigerating machine oil, a condenser connected to the compressor, a dryer, a capillary tube, an evaporator, and a suction tube, and the side of the side connected to the evaporator. Since the capillaries are provided with a tube expansion section that is larger than the predetermined inner diameter, even if the reaction product generated in the system adheres to the inner surface of the tube expansion section, the predetermined inner diameter of the capillaries can be secured, and the refrigerant and refrigeration Suppress the decrease in machine oil flow rate,
Poor cooling of the cooling system can be prevented.

Further, various reactants adhere to the inner surfaces of the expanded portion at the inlet and outlet of the capillary tube, but since both ends of the capillary tube are provided with expanded portions larger than a predetermined inner diameter, they adhere to the inner surface of the expanded portion. In addition, it is possible to secure a predetermined inner diameter of the capillary tube, suppress a decrease in the flow rates of the refrigerant and the refrigerating machine oil, and prevent cooling failure of the cooling system.

Further, since the cross section of the inlet portion of the refrigerant passage in which the capillary tube of the evaporator is opened is gradually changed, the liquid refrigerant is gradually evaporated, so that the separation from various reactants is suppressed, and the capillary outlet. Adhesion to the inner surface of the part can be suppressed, and cooling failure of the cooling system can be prevented.

[Brief description of drawings]

FIG. 1 is a piping diagram of a first embodiment of a cooling system according to the present invention.

FIG. 2 is a front view showing a connection state between an evaporator and a capillary tube of the cooling system of the embodiment.

3 is an enlarged cross-sectional view of the main part of FIG.

FIG. 4 is a front view showing the connection state of the capillaries of the second embodiment of the cooling system according to the present invention.

5 is an enlarged cross-sectional view of the main part of FIG.

FIG. 6 is a partial front view of an evaporator of a second embodiment of the cooling system according to the present invention.

7 is an enlarged cross-sectional view of the main part of FIG.

[Fig. 8] Piping diagram of a conventional cooling system

FIG. 9 is an enlarged cross-sectional view of a connection portion between an evaporator and a capillary tube of a conventional cooling system.

[Explanation of symbols]

 1 Compressor 2 Condenser 3,15 Dryer 6,20 Suction pipe 9,16,21 Evaporator 10,17,19 Capillary pipe 11,18a, 18b Pipe expansion part 12 Refrigerant 13 Refrigerator oil 22 Refrigerant passage 23 Opening 24 Narrow part 26 Entrance

Claims (3)

[Claims] 1. A refrigerant, a refrigerating machine oil, a compressor enclosing the refrigerating machine oil, a condenser connected to the compressor, a dryer, a capillary tube, an evaporator, and a suction tube, A cooling system characterized in that the capillary tube on the side connected to the evaporator is provided with a tube expansion section having a diameter larger than a predetermined inner diameter. 2. A cooling system according to claim 1, wherein the capillaries connected to the drier and the evaporator are provided with expanding portions having both ends larger than a predetermined inner diameter. 3. A refrigerant, a refrigerating machine oil, a compressor enclosing the refrigerating machine oil, a condenser connected to the compressor, a dryer, a capillary tube, a suction tube, and two sheets of aluminum or the like. A refrigerant passage formed between the plates is provided, the suction pipe is connected to the outlet side opening end of the refrigerant passage, the capillary tube is inserted into the suction pipe to open to the inlet of the refrigerant passage, and It consists of a single-inlet type evaporator in which the capillary tube is fixed to a narrow portion formed close to the opening end,
A cooling system characterized in that a cross section of an inlet portion of a refrigerant passage opening the capillary tube is gradually changed.