KR100945185B1 - Cooling device having defrosting system of evaporator - Google Patents

Abstract

The liquid separator has a double structure to store the liquid refrigerant condensed in the compressor, the condenser, the expansion valve, the evaporator and the condenser once, and sends the liquid refrigerant to the expansion valve and the gas refrigerant evaporated in the evaporator to the compressor. A cooling apparatus including a refrigeration cycle including a formed receiver and a cooling tank installed in a state in which the evaporator is immersed in water, wherein the cooling water supply line supplies a cooling water cooled by heat exchange operation of the evaporator to a place of use. A coolant temperature sensor configured to detect a temperature of the coolant discharged from the coolant outlet side of the connected cooling tank; A first solenoid valve installed in a coolant supply line connecting the liquid drinker and the expansion valve to receive a signal sensed by the coolant temperature sensor to open and close the valve; A refrigerant temperature sensor and a refrigerant pressure sensor installed in a refrigerant recovery line connecting the liquid receiver and the compressor to detect a temperature and pressure of the refrigerant; The second solenoid valve is installed in the bypass line connecting the refrigerant supply line between the compressor and the condenser and the refrigerant supply line between the expansion valve and the evaporator, and receives and receives a signal from the refrigerant temperature sensor and the refrigerant pressure sensor. It is invention which is characterized by including;

Chiller, evaporator, heat exchanger plate, first and second solenoid valves, bypass pine, circulation pump

Description

Cooling device having defrosting system of evaporator

The present invention relates to a cooling device equipped with an evaporator defrosting system, and more particularly, when the cooling operation is lowered due to ice generated in the heat exchanger plate due to the cooling operation of the evaporator for cooling water, the compressor is compressed at a high temperature and high pressure. By bypassing the hot refrigerant gas to the evaporator to drop the ice attached to the heat exchanger plate of the evaporator, the evaporator defrosting system allows the water stored in the cooling tank to be cooled and supplied to a temperature near the freezing point (0 ° C). It relates to a cooling device provided.

In general, when the temperature of water in the evaporator is cooled to near 0 ° C by operating the refrigerating device, freezing occurs inside the sealed evaporator, causing the water passage to be blocked, preventing the water from flowing or leaking pipes expanded on the hard board. do.

The shell and tube type evaporator of the prior art has a problem in that the pipe mounted inside the evaporator leaks, and the plate evaporator is so small that the hole formed between the plate and the plate is too small to freeze if the water is cooled to a temperature below freezing point. There is a problem that can block the holes to prevent the water flow.

In addition, in the conventional shell-and-tube type cooling system, when water mixed with scale and foreign matter flows to the evaporator, foreign matter accumulates between the baffles, and refrigerant gas does not flow uniformly through various pipes installed to connect the left and right hard plates. There is also a problem of not being.

In the case of the conventional plate heat exchanger, the hole is clogged by foreign matters caught between the holes, which causes a problem that the performance of the refrigerating device is lowered.

Because of this, conventional chillers have not cooled water to freezing temperatures.

The present invention is to solve the problems described in the prior art as described above to allow the water to be cooled to a temperature near freezing point or freezing point, to improve the evaporator of the refrigeration cycle to cool the water to a temperature near freezing point In order to freeze water on the heat exchange plate of the evaporator, the water is cooled to a temperature close to the freezing or freezing point by supplying hot refrigerant gas to the evaporator so that the ice frozen in the heat exchanger can be dropped. It is an object of the present invention to provide a cooling device equipped with an evaporator defrosting system that allows the operation to proceed continuously.

The present invention as a means for achieving the above object,

The liquid separator has a double structure to store the liquid refrigerant condensed in the compressor, the condenser, the expansion valve, the evaporator and the condenser once, and sends the liquid refrigerant to the expansion valve and the gas refrigerant evaporated in the evaporator to the compressor. In the cooling device comprising a refrigeration cycle comprising a receiver is formed and a cooling tank installed in the state in which the evaporator is immersed in water,

A coolant temperature sensor configured to detect a temperature of the coolant discharged from the coolant outlet side of the cooling tank to which the coolant supply line is connected to supply the coolant cooled by the heat exchange operation of the evaporator;

A first solenoid valve installed in a coolant supply line connecting the liquid drinker and the expansion valve to receive a signal sensed by the coolant temperature sensor to open and close the valve;

A refrigerant temperature sensor and a refrigerant pressure sensor installed in a refrigerant recovery line connecting the liquid receiver and the compressor to detect a temperature and pressure of the refrigerant;

The second solenoid valve is installed in the bypass line connecting the refrigerant supply line between the compressor and the condenser and the refrigerant supply line between the expansion valve and the evaporator, and receives and receives a signal from the refrigerant temperature sensor and the refrigerant pressure sensor. ;

It is characterized by having a.

In addition, in order to cool the water stored in the cooling tank to the freezing point or temperature close to the freezing point, the cooling water circulation line is installed in the outlet and inlet formed on one surface of the cooling tank and the circulation pump is installed in the cooling tank By circulating the cooling water in the circulation line is characterized in that to improve the heat exchange action with the evaporator.

In addition, the evaporator is a spring for improving the heat exchange action of the refrigerant in each of the plurality of refrigerant circulation pipes which are both ends are inserted into a plurality of assembly holes facing each other with a predetermined interval formed in each of the refrigerant circulation headers on both sides to be fixed by welding. The wire is inserted and installed.

In addition, the cooling tank has a disperser having a plurality of dispersion holes for discharging and discharging the used water supplied into the cooling tank through the inlet of the cooling water inlet, and the cooling water cooled in the cooling tank inside the cooling water outlet. It is characterized in that the water collector is formed with a plurality of water collecting holes to be evenly discharged.

According to the present invention it is possible to promote the heat exchange action with the evaporator by circulating the cooling water stored in the cooling tank can be cooled to a temperature near the freezing point or freezing point, ice is generated on both sides of the heat exchange plate of the evaporator when the cooling water is cooled When the ice formed on both sides of the heat exchange plate becomes more than a predetermined thickness to interfere with the cooling operation of the evaporator due to the phenomenon, the hot refrigerant gas compressed by the high temperature and high pressure in the compressor flows to the evaporator. By dropping the ice attached to the evaporator there is an effect that the cooling water can be supplied to the cooling water to the freezing point or near the freezing point in the normal cooling operation.

DETAILED DESCRIPTION Specific embodiments of a cooling apparatus equipped with an evaporator defrosting system according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a refrigeration cycle and an evaporator defrosting system of the cooling device for explaining the present invention, Figure 2 is a perspective view of the cooling tank showing the operating state of the cooling water of the cooling device of the present invention, Figure 3 is a line AA of Figure 2 4 is a cross-sectional view taken along line BB of FIG. 3, FIG. 5 is a perspective view of an evaporator of the present invention, FIG. 6 is a separated perspective view of a heat exchanger plate of the evaporator of the present invention, and FIG. 7 is a cross-sectional view of the evaporator of the present invention. .

Reference numeral 1 denotes a compressor, 2 a condenser, 3 a liquid receiver, and 4 an expansion valve. 5 denotes an evaporator and 6 denotes a cooling tank.

First, the cooling tank 6 is demonstrated.

In the water stored in the cooling tank 6, the evaporator 5 is installed soaked in water.

The cooling tank 6 is provided with a use water inlet 61 into which the use water sent after being used in the use point 7 using the coolant and a coolant outlet 62 supplying the coolant are provided. The coolant inlet 51 and the coolant outlet 52 for supplying and recovering the coolant to each other are projected.

In addition, the cooling tank 6 circulates the stored water in each of the outlet 63 and the inlet 64 formed separately from the use water inlet 61 and the cooling water outlet 62 to actively exchange heat with the evaporator 5. The cooling water circulation line 66 in which the first circulation pump 65 is installed is connected in order to be able to proceed, and the cooling water supply line 71 for supplying the cooling water to the place of use 7 is connected to the cooling water outlet 62. ) Is connected to the use water inlet 61, which is connected to the use water conveying line 72 for sending the used water used at the use place 7, and the second use water conveying line 72 is connected to the use water conveying line 72. The circulation pump 73 is provided.

In addition, a disperser 67 and a water collector 68 protruding to an inner surface of the cooling tank 6 are formed inside each of the use water inlet 61 and the cooling water outlet 62 formed on one surface of the cooling tank 6. In the disperser 67, a plurality of injection holes 67a are formed to evenly distribute the use water introduced through the use water inlet 61 into the cooling tank 6, and the water collector 68 is provided with a plurality of collecting holes 68a for evenly taking the cooling water cooled in the cooling tank 6.

Next, the evaporator 5 is demonstrated.

The evaporator 5 is installed in the cooling tank 6 in a state immersed in water so that the cooling tank 6 can be supplied from the outside to the refrigerant supplied in the low-temperature low-pressure fog state or a high-temperature high-pressure gas state refrigerant Refrigerant supply pipe 53 is connected to the refrigerant supply pipe 53 is connected to the refrigerant inlet 51 protruding to one surface of the refrigerant inlet, and the refrigerant outlet 52 protruding to one surface of the cooling tank 6 like the refrigerant inlet 51. ), One refrigerant circulation header 55a to which the refrigerant supply pipe 53 and the refrigerant recovery pipe 54 are connected at the same time, and the other refrigerant circulation header 55b formed to face the refrigerant refrigerant header on the one side; A plurality of refrigerant circulation pipes 56 which are fixed by welding in the state where both ends are inserted into each of a plurality of assembling holes (not shown) formed at predetermined intervals in each of the two refrigerant circulation headers 55a and 55b, and the both sides Both ends are inserted into the assembly holes of the refrigerant circulation headers 55a and 55b, respectively. It is composed of a heat exchange plate 57 formed to surround both sides of a plurality of predetermined refrigerant circulation pipes 56, in particular to extend the heat transfer area of the refrigerant in each of the plurality of refrigerant circulation pipes (56) In order to insert the spiral spring wire 58 in order to expand each of the spring wires 58 to the inner surface of each of the refrigerant circulation pipe 56 by expansion.

The heat exchange plate 57 is composed of two metal plates (57a) (57b) formed in parallel with each other grooves that can surround the refrigerant circulation tube 56, the metal plates (57a) (57b) are each The refrigerant circulation pipes 56 are bonded to each other by seam welding or spot welding.

In addition, a partition 55 is formed inside the one side refrigerant circulation header 55a to guide the refrigerant flowing through the refrigerant inlet 51 to be evenly distributed to the plurality of refrigerant circulation pipes 56. have.

Next, the liquid receiver 3 will be described.

The liquid receiver 3 temporarily stores the refrigerant in the gaseous state evaporated by heat exchange between the receiver 3a and the evaporator 5 to temporarily store the liquid refrigerant condensed at a low temperature and low pressure in the condenser 2. The liquid separator 3b for storing and heat-exchanging with the liquid refrigerant stored in the receiver 3a is formed in a double structure, and the liquid separator 3b and the compressor 1 have a refrigerant recovery line 11. Is connected.

In addition, a temperature sensor 8a is formed at the cooling water supply line 71 connecting the cooling water outlet 62 of the cooling tank 6 and the use place 7 to detect the temperature of the cooling water discharged from the cooling water outlet 62. In the refrigerant supply line 13 connecting the receiver 3a and the expansion valve 4 of the receiver 3, a first solenoid valve 9a is installed. 9a) is configured to block the flow of the refrigerant in the closing operation by a signal sent by sensing the coolant temperature from the temperature sensor 8a. For example, the first solenoid valve 9a may have a temperature detected by the coolant temperature sensor 8a close to a set temperature of the coolant cooled inside the cooling tank 6, that is, a freezing point (0 ° C.) to a freezing point. When the temperature (3 ° C or less) is open, when the temperature sensed by the coolant temperature sensor (8a) is a temperature higher than the set temperature (4 ° C or more), it is configured to shut off the flow of the refrigerant.

Meanwhile, the refrigerant supply line 12 connecting the compressor 1 and the condenser 2 and the refrigerant supply line 14 connecting the expansion valve 4 and the evaporator 5 are bypass lines 9. The second solenoid valve 9b is installed in the bypass line 9, and the second solenoid valve 9b is opened when the first solenoid valve 9a is closed. The refrigerant of the high temperature design compressed by the compressor (1) flows directly into the evaporator (5), and the high temperature and high pressure refrigerant flows into the refrigerant recovery line (11) because the high temperature and high pressure refrigerant flows directly into the evaporator (5). In case of flowing, the second solenoid valve 9b is closed by the signals of the refrigerant temperature sensor 8b and the refrigerant pressure sensor 8c which sense the temperature and pressure of the refrigerant, thereby blocking the bypass line 9. The first solenoid valve 9a is configured to open.

The operation of the present invention configured as described above will be described.

First, when the refrigeration cycle is normally operated, the first solenoid valve 9a installed in the refrigerant supply line 13 is in an open operation state, and the second solenoid valve 9b installed in the bypass line 9 is operated. Becomes closed.

Therefore, the high-temperature, high-pressure gaseous refrigerant compressed by the compressor 1 is condensed into the liquid refrigerant of the low-temperature low-pressure state in the condenser 2 and opened through the receiver 3a of the liquid receiver 3. Passed through the solenoid valve (9a) and is expanded rapidly in the expansion valve (4) is supplied to the evaporator (5) in the fog state, the refrigerant in the fog state flowing into the refrigerant inlet (51) of the evaporator (5) is a refrigerant supply pipe ( It is evenly distributed and supplied to each of the plurality of refrigerant circulation headers 55a connected to 53 to circulate in the direction of the arrow as shown in FIG. 7 through the plurality of refrigerant circulation tubes 56.

As described above, the refrigerant circulating along the plurality of refrigerant circulation pipes 56 has a heat transfer area expanded by spring wires 58 inserted into the respective refrigerant circulation pipes 56, so that both heat exchange plates 57 The heat exchange action in) is actively performed, and thus the water stored in the cooling tank 6 is cooled by the heat exchange action with the plurality of heat exchange plates 57 formed at regular intervals in the evaporator 5. In addition, the use water conveyed from the use destination (7) is introduced into the cooling tank (6) through the use water conveying line (72), at which time the operation of the first circulation pump (65) stored in the cooling tank (6) The coolant is cooled in a lower temperature than the conventional cooling device by performing heat exchange while contacting each heat exchange plate 57 in a circulation operation to circulate the inside of the cooling tank 6 through the coolant circulation line 66. For example, it is supplied to the use place 7 through the cooling water outlet 62 in the state cooled by freezing point (0 degreeC) to the temperature near freezing point.

On the other hand, by operating the first circulation pump (65) as described above, the cooling water stored in the cooling tank (6) flows out to the cooling water circulation line 66, and the cooling operation to a temperature close to the freezing point or freezing point in the circulation operation When the cooling operation is continuously performed, ice starts to freeze on both sides of each heat exchange plate 57 of the evaporator 5, and ice is formed on both sides of each heat exchange plate 57 to which the coolant contacts. When each heat exchange plate 57 is not enough to perform the heat exchange action to take the temperature of the coolant smoothly, the temperature of the coolant discharged to the user 7 through the coolant outlet 62 is higher than the set temperature (0 to 3 ° C). In this case, when the coolant temperature sensor 8a at the coolant outlet 62 detects the coolant temperature, the controller (not shown) causes the first solenoid valve 9a to respond to the detected signal. ) Is closed, while the second solenoid valve 9b is opened.

Therefore, the gas refrigerant compressed in the compressor 1 flows to the evaporator 5 through the bypass line 9 without flowing to the condenser 2, and thus the gas refrigerant compressed in the compressor 1 is a high temperature and high pressure. Since the plurality of heat exchange plates 57 formed on the evaporator 5 are heated by gas refrigerant of high temperature and high pressure to drop ice attached to both sides of each heat exchange plate 57, wherein the evaporator 5 The gas refrigerant of high temperature and high pressure supplied to each heat exchange plate 57 is made for a short time, and after the ice attached to both sides of each heat exchange plate 57 is dropped, the refrigeration cycle is normally operated.

That is, the gas refrigerant flowing to the liquid separator 3b of the liquid receiver 3 while heating each heat exchange plate 57 of the evaporator 5 is still maintained at a high temperature and high pressure, so that the liquid separator 3b described above. The refrigerant temperature sensor 8b and the refrigerant pressure sensor 8c respectively sense the temperature and pressure of the refrigerant during the circulation to the compressor 1 through the refrigerant recovery line 11, and the control device is detected by the detected signal. Since the second solenoid valve 9b is closed, the high-temperature and high-pressure gas refrigerant compressed by the compressor 1 cannot flow into the bypass line 9, while the second solenoid valve 9b is closed. At the same time, since the first solenoid valve 9a is opened at the same time, the high temperature and high pressure gas refrigerant compressed by the compressor 1 is operated in the normal operation manner, and the receiver 3a of the condenser 2 → the receiver 3 is operated. → expansion valve (4) → evaporator (5) → liquid separator (3b) of liquid receiver (3) → compression The circulation operation flowing to (1) is repeated, and the use water sent from the use place (7) to the cooling tank (6) is repeatedly circulated to the cooling water circulation line (66) by the first circulation pump (65). The heat exchange action with each of the heat exchange plates 57 of the evaporator 5 is activated, thereby allowing the cooling water stored in the cooling tank 6 to be cooled to a temperature near the freezing point or the freezing point.

1 is a schematic view showing a refrigeration cycle and an evaporator defrost system of a cooling apparatus for explaining the present invention.

Figure 2 is a perspective view of the cooling tank showing a cooling water operating state of the cooling device of the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view taken along the line B-B in FIG.

5 is a perspective view of an evaporator of the present invention.

Figure 6 is an exploded perspective view of the heat exchange plate of the evaporator of the present invention.

7 is a cross-sectional view of the evaporator of the present invention.

※ Explanation of code for main part of drawing

1: compressor 2: condenser

3: receiver 3a: receiver

3b; Liquid Separator 4: Expansion Valve

5: evaporator 51: refrigerant inlet

52: refrigerant outlet 53: refrigerant supply pipe

54: refrigerant recovery pipe 55a, 55b: refrigerant circulation header

56: refrigerant circulation tube 57: heat exchange plate

58: spring wire 6: cooling tank

61 water inlet 62 coolant outlet

63: inlet 64: outlet

65: first circulation pump 66: refrigerant circulation line
67: disperser 68: water collector

7: Where used 71: Cooling water supply line

72: water return line 73: the first circulation pump

8a: coolant temperature sensor 8b: refrigerant temperature sensor

8c: refrigerant pressure sensor 9a, 9b: first and second solenoid valve

Claims (4)

The liquid separator has a double structure to store the liquid refrigerant condensed in the compressor, the condenser, the expansion valve, the evaporator and the condenser once, and sends the liquid refrigerant to the expansion valve and the gas refrigerant evaporated in the evaporator to the compressor. In the cooling device comprising a refrigeration cycle comprising a receiver is formed and a cooling tank installed in the state that the evaporator is immersed in water, A coolant temperature sensor configured to sense a temperature of the coolant discharged from the coolant outlet side of the cooling tank to which the coolant supply line is connected to supply the coolant cooled by the heat exchange operation of the evaporator; A first solenoid valve installed in a coolant supply line connecting the liquid drinker and the expansion valve to receive a signal sensed by the coolant temperature sensor to open and close the valve; A refrigerant temperature sensor and a refrigerant pressure sensor installed in a refrigerant recovery line connecting the liquid receiver and the compressor to detect a temperature and pressure of the refrigerant; The second solenoid valve is installed in the bypass line connecting the refrigerant supply line between the compressor and the condenser and the refrigerant supply line between the expansion valve and the evaporator, and receives and receives a signal from the refrigerant temperature sensor and the refrigerant pressure sensor. ; Cooling apparatus equipped with an evaporator defrosting system, characterized in that it comprises a. The method of claim 1, In order to cool the water stored in the cooling tank to the freezing point or near the freezing point, the cooling water circulation line having a circulation pump installed at the outlet and the inlet formed on one surface of the cooling tank is connected to the cooling water stored in the cooling tank. Cooling apparatus provided with an evaporator defrosting system, characterized in that for circulating in the circulation line to improve the heat exchange action with the evaporator. The method of claim 1, The evaporator is a spring wire for improving the heat exchange action of the refrigerant in each of the plurality of refrigerant circulation pipes which are both ends are inserted into a plurality of assembly holes facing each other with a predetermined interval formed in each of the refrigerant circulation headers on both sides are fixed by welding Cooling apparatus provided with an evaporator defrosting system characterized by being inserted. The method of claim 1, The cooling tank has a disperser having a plurality of dispersion holes for discharging and discharging the used water supplied through the inlet to the inside of the use water inlet, and evenly inside the cooling water outlet, the coolant cooled in the cooling tank is evenly distributed. Cooling apparatus equipped with an evaporator defrosting system, characterized in that the water collector is formed with a plurality of water collecting holes for intake and discharge.

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