JPH0735465A - Refrigerator - Google Patents

Abstract

PURPOSE:To provide a refrigerator wherein a drain evaporation quantity can be increased and a cooling efficiency of a compressor can be raised. CONSTITUTION:In a refrigeration unit wherein a compressor 1 of a closed type, a condenser 5, a decompression device 9 and an evaporator 11 are connected in that order, a cooling tube 300 for returning temporarily a discharge cooling medium from the compressor 1 of the closed type to a compressor case 1a is formed, and the drain evaporating device 3 and a subcooler 7 are connected in series to this cooling tube 300, and at an outlet of the sub-cooler 7, a distributor 200 dividing the cooling medium into a gas cooling medium from a liquid cooling medium is equipped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system for a showcase, for example.

[0002]

2. Description of the Related Art In general, a refrigeration for a showcase including a subcooler for cooling a motor winding of a hermetic compressor and a drain evaporation device for forcibly evaporating drain accumulated in the showcase. The device is known.

This type of refrigerating apparatus, as shown in FIG.
A hermetic compressor 1 is provided. The high-temperature and high-pressure refrigerant gas discharged from the compressor 1 once passes through the subcooler 7, is condensed and cooled there, and then enters the case 1a of the compressor 1 again. Then, the refrigerant that has left the case 1a enters the drain evaporator 3 where it is condensed and the drain is evaporated.

Then, the refrigerant discharged from the drain evaporator 3 is
It enters the condenser 5, condenses and liquefies there, enters the expansion valve 9, where it evaporates and enters the evaporator 11. And the evaporator 1
The heat is exchanged at 1 and evaporates to return to the compressor 1.

[0005]

However, in the above configuration, after the refrigerant that has been once cooled through the sub-cooler 7 is returned to the compressor 1 and the motor in the compressor 1 is cooled. , From this compressor to drain evaporator 3
Therefore, there is a problem that the amount of drain evaporation cannot be increased so much.

Further, in the subcooler 7, since the refrigerant cannot be cooled to the condensing temperature, there is a problem that the cooling efficiency of the motor in the compressor 1 cannot be improved.

This is because if the refrigerant is cooled to the condensation temperature in the subcooler 7, a part of the refrigerant is liquefied, causing liquid back to the compressor 1 and possibly damaging the machine.

[0008] Therefore, an object of the present invention is to provide a refrigerating apparatus which can solve the problems of the above-mentioned conventional techniques, increase the evaporation amount of drain, and improve the cooling efficiency of the compressor. It is in.

[0009]

In order to achieve the above object, the present invention provides a hermetic compressor, a condenser, a decompression device, and a refrigeration system in which an evaporator is connected in that order from a hermetic compressor. A cooling pipe is provided for returning the discharged refrigerant to the inside of the compressor case.The drain evaporator and the subcooler are connected in series to this cooling pipe, and the refrigerant is gas refrigerant and liquid refrigerant at the outlet of the subcooler. It is characterized in that a shunt is provided for separating into and.

Further, according to the present invention, a bypass pipe may be provided for allowing the liquid refrigerant separated by the flow distributor to bypass the condenser and join upstream of the pressure reducing device.

[0011]

According to the present invention, the high temperature discharged from the compressor,
Since the high-pressure refrigerant directly enters the drain evaporation device, the refrigerant there rapidly condenses and releases a large amount of heat to the surroundings, so that the evaporation amount of the drain can be increased. Since the flow divider for separating the refrigerant into the liquid refrigerant is provided, for example, only the gas refrigerant is sent to the compressor, and liquid back to the compressor is unlikely to occur. Further, the subcooler can sufficiently cool the refrigerant to the condensing temperature, so that the cooling efficiency of the compressor can be improved.

[0012]

EXAMPLE An example of the refrigerating apparatus according to the present invention will be described below.
1 to 3 in which the same parts as those in FIG. 4 are denoted by the same reference numerals.
Will be described with reference to.

FIG. 1 shows the appearance of a typical showcase 100. The case portion 1 of this showcase 100 is shown.
A unit portion 100b in which the refrigerating apparatus according to this embodiment is incorporated is provided below the 00a.

FIG. 2 is a circuit diagram of the refrigerating apparatus according to this embodiment.

Reference numeral 1 denotes a hermetic compressor. The high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is cooled by the cooling pipe 3
After entering the drain evaporator 3 through 00, the subcooler 7 is entered. Then, the drain evaporation device 3 condenses to evaporate the surrounding drain, and the subcooler 7 radiates heat to cool the refrigerant. That is, the drain evaporator 3 and the subcooler 7 are connected in series to the cooling pipe 300.

At the outlet of the subcooler 7, a flow divider 2 to be described later is provided.
00 is provided, and here, the refrigerant is separated into a gas refrigerant and a liquid refrigerant.

Then, only the gas refrigerant enters the case 1a of the compressor 1, cools the motor winding of the compressor 1 and the like, then exits there and enters the condenser 5. It is condensed and liquefied in the condenser 5, and then enters the expansion valve 9 where it evaporates and evaporates 1
Enter 1. Then, heat is exchanged in the evaporator 11 to evaporate and return to the compressor 1.

FIG. 3 shows a shunt 200.

The flow distributor 200 has a tubular body 201,
This main body 201 has a pipe 203 introduced from the compressor 1.
And a pipe 205 to the compressor 1 and a bypass pipe 207 to the outlet of the condenser 5 are connected.

According to this, the refrigerant cooled to the condensation temperature in the subcooler 7 enters the main body 201 through the pipe 203, and is separated into a gas refrigerant and a liquid refrigerant there.

Then, as described above, the gas refrigerant is supplied to the pipe 2
After passing through 05 to enter the case 1a of the compressor 1 and cool the motor winding of the compressor 1, the liquid refrigerant passes through the bypass pipe 207 to the condenser 5 and passes through the case 1a of the compressor 1. , And the condenser 5, bypassing the expansion valve 9.

According to this, since the high temperature and high pressure refrigerant discharged from the compressor 1 is directly guided to the drain evaporation device 3, the drain generated in the showcase as compared with the conventional one (FIG. 4). The amount of evaporation of can be increased.

Further, according to this embodiment, the subcooler 7
Since the flow divider 200 is provided at the outlet of the flow divider 200,
Since only the gas refrigerant separated in step 1 needs to be returned to the case 1a of the compressor 1, even if the refrigerant is cooled to the condensation temperature by the drain evaporator 3 or the subcooler 7, the compressor 1
It does not cause liquid back to.

Therefore, in the subcooler 7, the refrigerant can be sufficiently cooled to the condensing temperature, the cooling efficiency of the compressor 1 can be improved, and the winding of the compressor 1 can be sufficiently protected. .

The liquid refrigerant separated by the flow divider 200 is
If the upstream pipe of the expansion valve 9 is joined through the bypass pipe 207, the amount of the refrigerant flowing to the condenser 5 is reduced accordingly, and the burden is reduced, and the condenser 5 can be downsized. Become.

Further, in the conventional device (FIG. 4), all the devices are connected in series, and the refrigerant flows along a series of pipes, so that the entire stroke of the pipes is lengthened and the pressure resistance is increased. This reduces the total stroke of the tube and therefore reduces the pressure resistance.

In short, in this embodiment, the subcooler 7
Since the flow divider 200 is installed at the outlet of the subcooler 7,
Then, the refrigerant can be cooled to the condensation temperature, and the cooling efficiency of the compressor 1 can be improved.

[0028]

As is apparent from the above description, according to the present invention, the refrigerant discharged from the compressor is directly led to the drain evaporation device, so that the evaporation amount of the drain can be increased. Further, since a flow divider that separates the refrigerant into a gas refrigerant and a liquid refrigerant is provided at the outlet of the subcooler, even if the refrigerant is cooled to the condensation temperature by the subcooler, for example, only the gas refrigerant should be sent to the compressor. I'm fine
Liquid back to the compressor cannot occur. Therefore, the subcooler can sufficiently cool the refrigerant to the condensing temperature, and the cooling efficiency of the compressor can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing the appearance of a showcase.

FIG. 2 is a circuit diagram showing an embodiment of a refrigerating apparatus according to the present invention.

FIG. 3 is a vertical cross-sectional view showing a flow divider.

FIG. 4 is a circuit diagram showing a conventional refrigeration system.

[Explanation of symbols]

 1 Compressor 3 Drain Evaporator 5 Condenser 7 Subcooler 9 Expansion Valve (Decompressor) 11 Evaporator 200 Flow Divider 203,205 Pipe 207 Bypass Pipe 300 Cooling Pipe

Claims (2)

[Claims] 1. A refrigeration system in which a hermetic compressor, a condenser, a decompression device, and an evaporator are connected in this order, and a cooling pipe for temporarily returning the refrigerant discharged from the hermetic compressor into the compressor case. The refrigerating apparatus is characterized in that a drain evaporator and a subcooler are connected in series to the cooling pipe, and a flow divider for separating the refrigerant into a gas refrigerant and a liquid refrigerant is provided at the outlet of the subcooler. 2. The refrigerating apparatus according to claim 1, further comprising a bypass pipe for allowing the liquid refrigerant separated by the flow distributor to bypass the condenser and join upstream of the pressure reducing device.