KR101268924B1 - Refrigerating apparatus including dual evaporator - Google Patents

Abstract

PURPOSE: A composite cooling device using a dual evaporator is provided to defrost an evaporating coil. CONSTITUTION: A composite cooling device using a dual evaporator comprises a condensing coil(20), a refrigerant line(29), first and second evaporating coils(30,40), a first expansion valve(27), a compressor line(16), first control valves(17,25,39), first bypass lines(52,54), second bypass lines(56,62,64), second control valve(53,55,57,65), and second expansion valves(63,67). Refrigerant compressed by a compressor flows in the condensing coil. The refrigerant line is connected to the condensing coil. The first evaporating coils are connected to the refrigerant line. The first expansion valve is arranged in the rear side of an evaporating unit of the first evaporating coil. The compressor line is connected to the second evaporating coil. One end of the first bypass line is connected to a contact point of the refrigerant line and the first evaporating coil, and the other end thereof is connected to the rear side of the evaporating unit of the first evaporator coil and the front side of the first expansion valve. The first control valves are installed in contact points of the refrigerant line and the first evaporating coil and the first bypass lines. Each one end of the second bypass lines is connected to the front side of the evaporating unit of the first evaporating coil and the rear side of a contact point of the first and second evaporating coils, and each the other end of the second by pass lines are connected to the front side of the contact point of the first and second evaporating coils and the rear side of the evaporating unit of the second evaporating coil. The second control valves are installed in the contact point of the first and second evaporating coils. The second expansion valves are installed in the second bypass lines.

Description

REFRIGERATING APPARATUS INCLUDING DUAL EVAPORATOR}

The present invention relates to a complex cooling device, and more particularly, to a complex cooling device capable of simultaneously defrosting and cooling using a plurality of evaporators.

The refrigeration cycle of the refrigeration or refrigeration system compresses the refrigerant passing through the evaporator in the compressor to form a high temperature and high pressure gas, and converts the refrigerant into a high temperature and high pressure liquid in the condenser, and then converts it into a low temperature and low pressure liquid in the expansion valve, and then to a low temperature low pressure gas in the evaporator. Repeat the cycle to heat exchange with the air in the evaporator to lower the temperature inside the freezer or refrigerator.

In this case, when frost occurs in the evaporator, it is necessary to perform defrosting because the heat exchange efficiency with air is lowered, and defrosting is performed using an electric heater (partly inserted with a heater in the evaporator coil). That is, the frost generated on the surface of the evaporator can be removed by partially inserting a rod heater into the evaporator coil and heating the outside of the stacked coil to melt the frost.

However, the above method removes the frost of the evaporator by heating the electric heater using a separate electric energy, so that the energy efficiency is lowered, and a separate facility such as an electric heater is required and maintenance costs are required. However, there is a disadvantage that the temperature change of the object to be cooled is large. In particular, since the heater must be partially inserted into the evaporator coil to remove the frost, a large amount of heat is required per rod heater, so the amount of heat lost due to heat generation during defrosting at the instantaneous temperature (100-150 ° C.) is high. It is difficult to maintain product freshness due to rapid temperature change.

Korea Utility Model Registration No. 0267362 2002.03.09.

An object of the present invention to provide a complex cooling device that can remove the frost generated in the evaporation coil.

Another object of the present invention is to provide a complex cooling device that can minimize the temperature change of the object to be cooled as well as not adding a separate heating device.

Still other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

According to an embodiment of the present invention, a complex cooling device utilizing a dual evaporator, a compressor; A condensation coil through which the refrigerant compressed by the compressor flows therein; A refrigerant supply line connected to the condensation coil to transfer the refrigerant from the condensation coil; A first evaporation coil connected to the refrigerant supply line and configured to transfer the refrigerant from the refrigerant supply line; A first expansion valve installed on the first evaporating coil and positioned behind the evaporation unit of the first evaporating coil; A second evaporating coil connected to the first evaporating coil and transferring the refrigerant from the first evaporating coil; A compressor supply line connected to the second evaporation coil to transfer the refrigerant from the second evaporation coil, and to the compressor; A first bypass line having one end connected to the contact point of the refrigerant supply line and the first evaporating coil, and the other end connected to the front of the first expansion valve and to the rear of the evaporation part of the first evaporating coil; A first control valve installed at a contact point of the refrigerant supply line, the first evaporation coil, and a first bypass line to communicate the refrigerant supply line with any one of the first evaporation coil and the first bypass line; One end is connected to the rear of the contact point of the first evaporation coil and the second evaporation coil and the front of the evaporation unit of the first evaporation coil, the front of the contact point of the first evaporation coil and the second evaporation coil and the second A second bypass line having the other end connected to the rear of the evaporation unit of the evaporation coil; A second control valve installed at a contact point of the first evaporating coil and the second evaporating coil to selectively communicate the first evaporating coil and the second evaporating coil; And a second expansion valve installed on the second bypass line.

A third control valve installed on the first bypass line to open and close the first bypass line; And a fourth control valve installed on the second bypass line to open and close the second bypass line.

The combined cooling device may include: a third bypass line having one end connected to the first bypass line and one end connected to the front of the evaporation unit of the second evaporation coil; A fifth control valve installed on the third bypass line to open and close the third bypass line; A fourth bypass line having one end connected to a front side of the second expansion valve among the second bypass lines, and another end connected to a rear side of the second expansion valve among the second bypass lines; A third expansion valve installed on the fourth bypass line; The first bypass line and the first bypass line of the contact point and the first evaporation coil of the first end of the evaporation unit is connected to one end, and the other end may further comprise a fifth bypass line connected to the compressor supply line. .

The complex cooling device may further include a sixth control valve installed on the fifth bypass line to open and close the fifth bypass line.

The fourth control valve may be installed on the fourth bypass line, and may be a four-way valve that opens one of the second bypass line and the fourth bypass line.

The combined cooling device is installed at a contact point of the compressor supply line, the second evaporation coil, and the fifth bypass line to communicate the compressor supply line with any one of the second evaporation coil and the fifth bypass line. Further comprising a seventh control valve, the seventh control valve may be a three-way valve.

According to another embodiment of the present invention, a complex cooling device utilizing a dual evaporator, the compressor; A condensation coil through which the refrigerant compressed by the compressor flows therein; A refrigerant supply line connected to the condensation coil to transfer the refrigerant from the condensation coil; A first evaporation coil connected to the refrigerant supply line and configured to transfer the refrigerant from the refrigerant supply line; A first expansion valve installed on the first evaporating coil and positioned behind the evaporation unit of the first evaporating coil; A second evaporating coil connected to the first evaporating coil and transferring the refrigerant from the first evaporating coil; A compressor supply line connected to the second evaporation coil to transfer the refrigerant from the second evaporation coil, and to the compressor; One end is connected to the rear of the contact point of the first evaporation coil and the second evaporation coil and the front of the evaporation unit of the first evaporation coil, the front of the contact point of the first evaporation coil and the second evaporation coil and the second A fourth bypass line having the other end connected to the rear of the evaporation coil of the evaporation coil; A second control valve installed at a contact point of the first evaporating coil and the second evaporating coil to selectively communicate the first evaporating coil and the second evaporating coil; A second expansion valve installed on the fourth bypass line; And a fifth bypass line separated from between the first expansion valve and the rear of the evaporator of the first evaporation coil and connected to the compressor supply line.

According to one embodiment of the present invention, the frost generated in the evaporation coil can be removed by using the high temperature and high pressure refrigerant passing through the compressor. In particular, it is possible to remove the frost without a separate heating device, it is possible to prevent the reduction of energy efficiency due to defrosting. In addition, the refrigerant can be condensed using the evaporated coil generated by the frost, thereby reducing the energy consumed in the condensation fan, and then cooling the cooling efficiency in the other evaporated coil by lowering the refrigerant at low temperature through the expansion valve. You can increase it.

1 is a view showing a normal operating state of the cooling apparatus according to an embodiment of the present invention.
FIG. 2 is a view illustrating a first defrosting operation state when frost occurs in the first evaporating coil shown in FIG. 1.
FIG. 3 is a view illustrating a second defrosting operation state when frost occurs in the second evaporating coil shown in FIG. 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments are provided to explain the present invention to a person having ordinary skill in the art to which the present invention belongs. Accordingly, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer description.

Meanwhile, 'front' and 'rear' used below refer to the direction of movement of the refrigerant in the normal operation state, 'front' means forward with respect to the direction of movement, and 'rear' means rear with respect to the direction of movement. it means.

1 is a view showing a normal operating state of the cooling apparatus according to an embodiment of the present invention. As shown in FIG. 1, the refrigerant is gasified at high temperature and high pressure through the compressor 10 and discharged through the compressor discharge line 12. The refrigerant passes through an oil separator 14 to separate the oil and moves through the condensation coil 20. The condensation fan 22 is installed in the condensation part 21 of the condensation coil 20, and the condensation part 21 is arranged in a zigzag on the condensation fan 22 to maximize the cooling efficiency. The refrigerant discharges latent heat into the atmosphere through the condensation unit 21 to become a high temperature and high pressure liquid, and is stored in a receiver tank 28.

Thereafter, the refrigerant moves to the first evaporation coil 30 through the filter / dryer 29a through the refrigerant supply line 29. The first control valve 25 is installed at the contact point of the refrigerant supply line 29 and the first evaporation coil 30, and the refrigerant supply line 29 is connected to the first evaporation coil 30 and the first bypass line 52. (Or the third bypass line 54). The first control valve 25 may be a three-way valve.

The first bypass line 52 is connected to the first control valve 25 to branch from the contact point of the refrigerant supply line 29 and the first evaporation coil 30, and is connected to the front of the first expansion valve 27. . The third control valve 53 may be installed in the first bypass line 52 to open and close the first bypass line 52. In addition, the third bypass line 54 is connected to the front of the evaporator 41 of the second evaporation coil 40, the fifth control valve 55 is installed in the third bypass line 54, the third bypass line (54) can be opened and closed. In the normal operation state, the first control valve 25 communicates the refrigerant supply line 29 and the first evaporation coil 30, and the third and fifth control valves 53 and 55 are closed. Meanwhile, the third bypass line 54 may be described as being branched from the first bypass line 52, and conversely, the first bypass line 52 may be described as being branched from the third bypass line 54. have.

In addition, the fifth bypass line 56 may be branched from the front of the contact point between the first evaporation coil 30 and the first bypass line 52, and may be connected to a seventh control valve 17 to be described later. The fourth control valve 57 is installed in the fifth bypass line 56 to open and close the fifth bypass line 56, and the fourth control valve 57 is closed in the normal operation state.

The first expansion valve 27 is installed on the first evaporation coil 30, and the refrigerant is converted into a low temperature low pressure liquid through the first expansion valve 27. Thereafter, the refrigerant passes through the evaporation unit 31 of the first evaporation coil 30, and the evaporation unit 31 is installed in the space to be cooled to absorb heat in the space. The evaporator 31 is arranged in a zigzag to maximize the heat exchange efficiency. The first evaporator fan 31 is installed in the evaporator 31 to help the heat exchange smoothly. Thereafter, the refrigerant moves to the second evaporation coil 40 and passes through the evaporation unit 41 of the second evaporation coil 40, and the evaporation unit 41 is installed in a space to be cooled to absorb heat in the space. do. Evaporator 41 is arranged in a zigzag to maximize the heat exchange efficiency. The second evaporator fan 41 is installed in the evaporator 41 to help the heat exchange smoothly.

The second control valve 39 is installed between the first evaporation coil 30 and the second evaporation coil 40 to allow or block the movement of the refrigerant. The second evaporation coil 40 is connected to the compressor supply line 16, and the refrigerant is recompressed in the compressor 10 after moving to the compressor supply line 16 through the second evaporation coil 40. The seventh control valve 17 is installed at the contact point of the second evaporation coil 40, the compressor supply line 16, and the fifth bypass line 56 to connect the compressor supply line 16 with the second evaporation coil 40 and It is possible to communicate with any one of the fifth bypass line 56, the second evaporation coil 40 is in communication with the compressor supply line 16 in the normal operation state.

On the other hand, the second bypass line 62 is connected to the first evaporation coil 30 and the second evaporation coil 40, respectively, and is connected to the rear and front of the second control valve 39, respectively. The fourth control valve 65 is installed on the second bypass line 62, and the second expansion valve 67 is installed in front of the fourth control valve 65. In addition, the fourth bypass line 64 branches from the second bypass line 62 and passes through the fourth control valve 65 to the rear of the fourth control valve 65 and the front of the second expansion valve 67. One end and the other end are respectively connected. The third expansion valve 63 is installed on the fourth bypass line 64. In the normal operation state, the fourth control valve 65 is closed, and the refrigerant may move from the first evaporation coil 30 to the second evaporation coil 40.

Through the above process, the heat inside the space is absorbed through the first and second evaporation coils 30 and 40 and then discharged to the outside through the condensation coil 20, the inside of the space can be cooled to a desired temperature. have. However, as described above, when frost occurs in the first and second evaporation coils 30 and 40, since the refrigerant cannot smoothly absorb heat in the space, the cooling efficiency is drastically lowered, so that the defrosting operation is performed. It is required.

FIG. 2 is a view illustrating a first defrosting operation state when frost occurs in the first evaporating coil shown in FIG. 1. In the first defrosting operation state, the first control valve 25 communicates with the refrigerant supply line 29 and the first bypass line 52, and the refrigerant does not pass through the first expansion valve 27 and the first evaporation coil. Go to (30). At this time, the fourth and fifth control valves 57 and 55 maintain the closed state. Therefore, the refrigerant passes through the evaporation unit 31 of the first evaporation coil 30 while maintaining the high temperature and high pressure state, and the frost generated in the first evaporation coil 30 may be removed through the refrigerant. The refrigerant passing through the first evaporation coil 30 may be in a low temperature and high pressure state.

The second control valve 39 maintains a closed state, and the fourth control valve 65 opens the second bypass line 62. Accordingly, the refrigerant in the low temperature and high pressure state moves from the first evaporation coil 30 to the second evaporation coil 40 through the second bypass line 62 and is converted to the low temperature low pressure state through the second expansion valve 67. do. In this case, since the refrigerant passes through the second expansion valve 67 in the first cooled state in the first evaporation coil 30, the refrigerant may be maintained in a supercooled state to exhibit high cooling performance. Thereafter, the refrigerant moves to the second evaporation coil 40 and passes through the evaporation unit 41 of the second evaporation coil 40, and the evaporation unit 41 is installed in a space to be cooled to absorb heat in the space. do. Therefore, the frost generated in the first evaporating coil 30 may be removed and the cooling performance may be maintained through the second evaporating coil 40. The refrigerant is moved to the compressor supply line 16 through the second evaporation coil 40 and then recompressed in the compressor 10, and the seventh control valve 17 moves the compressor supply line 16 to the second evaporation coil. Communicate with (40).

Meanwhile, in the first defrosting operation state, the condensation fan 22 may be stopped to minimize cooling in the condensation unit 21. The reason for this is to improve energy efficiency by eliminating unnecessary operation of the condensation fan 22 while securing sufficient heat to remove frost of the first evaporating coil 30 later.

FIG. 3 is a view illustrating a second defrosting operation state when frost occurs in the second evaporating coil shown in FIG. 1. In the second defrosting operation state, the first control valve 25 communicates with the refrigerant supply line 29 and the third bypass line 54, and the refrigerant does not pass through the first expansion valve 27 and the second evaporating coil. Go to 40. At this time, the third control valve 53 maintains a closed state, the fourth control valve 57 maintains an open state, and the seventh control valve 17 passes the compressor supply line 16 to the fifth bypass line 56. ). Therefore, the refrigerant passes through the evaporation unit 31 of the second evaporation coil 30 while maintaining the high temperature and high pressure state, and the frost generated in the second evaporation coil 30 may be removed through the refrigerant. The refrigerant passing through the second evaporation coil 40 may be in a low temperature and high pressure state.

The second control valve 39 maintains a closed state, and the fourth control valve 65 opens the fourth bypass line 64. Therefore, the refrigerant in the low temperature and high pressure state moves from the second evaporation coil 30 to the first evaporation coil 30 through the fourth bypass line 64 and is converted to the low temperature low pressure state through the third expansion valve 63. do. In this case, since the refrigerant passes through the third expansion valve 63 in the state of primary cooling in the second evaporation coil 40, the refrigerant may maintain a supercooled state to exhibit high cooling performance. Thereafter, the refrigerant moves to the first evaporation coil 40 and passes through the evaporation unit 31 of the first evaporation coil 30, and the evaporation unit 31 is installed in a space to be cooled to absorb heat in the space. do. Therefore, the frost generated in the second evaporation coil 40 may be removed and the cooling performance may be maintained through the first evaporation coil 30. The refrigerant is recompressed in the compressor 10 after moving to the compressor supply line 16 through the first evaporation coil 30 and the fifth bypass line 56, and the seventh control valve 17 is a compressor supply line. (16) is communicated with the fifth bypass line (56).

Meanwhile, in the second defrosting operation state, the condensation fan 22 may be stopped to minimize cooling in the condensation unit 21. The reason for this is to improve energy efficiency by omitting unnecessary operation of the condensation fan 22 while ensuring sufficient heat to remove frost of the second evaporation coil 40 later.

Although the present invention has been described in detail by way of preferred embodiments thereof, other forms of embodiment are possible. Therefore, the technical idea and scope of the claims set forth below are not limited to the preferred embodiments.

10: Compressor
12: compressor discharge line
14: oil separator
16: Compressor Supply Line
17,25,39,53,55,57,65: regulating valve
27,63,67: Expansion valve
20: condensation coil
21: condensation unit
22: condensation fan
28: receiver
29: refrigerant supply line
30,40: evaporated coil
31,41: evaporator
32,42: Evaporating Fan
52,54,56,62,64: bypass line

Claims (7)

compressor;
A condensation coil through which the refrigerant compressed by the compressor flows therein;
A refrigerant supply line connected to the condensation coil to transfer the refrigerant from the condensation coil;
A first evaporation coil connected to the refrigerant supply line and configured to transfer the refrigerant from the refrigerant supply line;
A first expansion valve installed on the first evaporating coil and positioned behind the evaporation unit of the first evaporating coil;
A second evaporating coil connected to the first evaporating coil and transferring the refrigerant from the first evaporating coil;
A compressor supply line connected to the second evaporation coil to transfer the refrigerant from the second evaporation coil, and to the compressor;
A first bypass line having one end connected to the contact point of the refrigerant supply line and the first evaporating coil, and the other end connected to the front of the first expansion valve and to the rear of the evaporation part of the first evaporating coil;
A first control valve installed at a contact point of the refrigerant supply line, the first evaporation coil, and a first bypass line to communicate the refrigerant supply line with any one of the first evaporation coil and the first bypass line;
One end is connected to the rear of the contact point of the first evaporation coil and the second evaporation coil and the front of the evaporation unit of the first evaporation coil, the front of the contact point of the first evaporation coil and the second evaporation coil and the second A second bypass line having the other end connected to the rear of the evaporation unit of the evaporation coil;
A second control valve installed at a contact point of the first evaporating coil and the second evaporating coil to selectively communicate the first evaporating coil and the second evaporating coil; And
And a second expansion valve installed on the second bypass line. The method of claim 1,
A third control valve installed on the first bypass line to open and close the first bypass line; And
And a fourth control valve installed on the second bypass line to open and close the second bypass line. The method according to claim 1 or 2,
The composite cooling device,
A third bypass line having one end connected to the first bypass line and one end connected to the front of the evaporation unit of the second evaporation coil;
A fifth control valve installed on the third bypass line to open and close the third bypass line;
A fourth bypass line having one end connected to a front side of the second expansion valve among the second bypass lines, and another end connected to a rear side of the second expansion valve among the second bypass lines;
A third expansion valve installed on the fourth bypass line; And
Further comprising a fifth bypass line, one end of which is connected to the front of the contact point of the first evaporation coil and the first bypass line and the rear of the evaporator of the first evaporation coil, and the other end of which is connected to the compressor supply line. Combined chiller with evaporator. The method of claim 3,
The composite cooling device,
And a sixth control valve installed on the fifth bypass line to open and close the fifth bypass line. The method of claim 3,
The fourth control valve is installed on the fourth bypass line, a combined cooling device utilizing a dual evaporator is a four-way valve to open any one of the second bypass line and the fourth bypass line. The method of claim 3,
The composite cooling device,
A seventh control valve installed at a contact point of the compressor supply line, the second evaporation coil, and the fifth bypass line to communicate the compressor supply line with any one of the second evaporation coil and the fifth bypass line; Include,
The seventh control valve is a three-way valve, a composite cooling device utilizing a dual evaporator. compressor;
A condensation coil through which the refrigerant compressed by the compressor flows therein;
A refrigerant supply line connected to the condensation coil to transfer the refrigerant from the condensation coil;
A first evaporation coil connected to the refrigerant supply line and configured to transfer the refrigerant from the refrigerant supply line;
A first expansion valve installed on the first evaporating coil and positioned behind the evaporation unit of the first evaporating coil;
A second evaporating coil connected to the first evaporating coil and transferring the refrigerant from the first evaporating coil;
A compressor supply line connected to the second evaporation coil to transfer the refrigerant from the second evaporation coil, and to the compressor;
One end is connected to the rear of the contact point of the first evaporation coil and the second evaporation coil and the front of the evaporation unit of the first evaporation coil, the front of the contact point of the first evaporation coil and the second evaporation coil and the second A fourth bypass line having the other end connected to the rear of the evaporation coil of the evaporation coil;
A second control valve installed at a contact point of the first evaporating coil and the second evaporating coil to selectively communicate the first evaporating coil and the second evaporating coil;
A second expansion valve installed on the fourth bypass line; And
And a fifth bypass line separated from between the first expansion valve and the rear of the evaporator of the first evaporation coil and connected to the compressor supply line.

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