KR100937202B1 - A refrigerator for dryer and cold store - Google Patents

Abstract

PURPOSE: A refrigerator with a dryer and a cold store is provided to operate stably in a wide temperature range by performing various modes using one dryer. CONSTITUTION: A refrigerator with a dryer and a cold store comprises an electronic freezing valve(111), a freezing check valve(112), an electronic drying valve(113), a drying check valve(114) and a liquid receiver(140). Two coolant pipes(L1,L2) is branched from an outlet pipe of an oil separator(110). The freezing check valve and the electric freezing valve are serially connected to one side of the coolant pipe. The drying check valve and the electric drying valve are serially connected to the other side of the coolant pipe and connected to an opening of an inner condenser(130). An outlet of the inner condenser is connected to the outlet of the freezing check valve and an inlet of an outer condenser(120). The liquid receiver is connected to the outlet of the outer condenser.

Description

Refrigerator unit with dryer and freezer {A refrigerator for dryer and cold store}

The present invention relates to a refrigerator unit that also serves as a dryer and a freezer, and in detail, the compressor can be stably operated even in a wide temperature range of 55 ° C. to 25 ° C. in a drying room, so that the compressor is freeze-dried / cold air according to the characteristics of agricultural and aquatic products. Dry / hot air drying / high temperature dryer and variable temperature (freezing + drying) can be freely operated to dry various kinds of agricultural and marine products including persimmon, yellow, and gomegi, and if not used as a drying room, a freezer of below -25 ℃ It can also be used as.

1 shows a refrigeration unit of a conventional heat pump type, which is a refrigerant external condenser 3 or a drying internal condenser in which a refrigerant is disposed in parallel to a refrigerant circulation tube through an oil separator 2 in a compressor 1. After passing through (5), through the receiver (7) and the dry (8) is expanded in the expansion valve (10) and then circulated back to the compressor (1) via the evaporator (11).

In the drawings, 4 and 6 are solenoid valves installed at the outlet side of the inner and outer condensers 3 and 5, 9 are liquid level meters, and 12 and 13 are filter and liquid separator.

In the conventional refrigeration unit shown in Figure 1 there is no great inconvenience during freezing, but repeated drying (temperature drying) or high temperature drying (40 ℃ or more) when the internal temperature of the drying chamber at high temperature and high humidity comes out from the internal condenser (5) Since the refrigerant gas enters the receiver 7 in the expanded state, the high-pressure safety device of the compressor 1 has a problem that frequently causes trouble. In the case of repeated freezing and drying, that is, variable temperature drying, the refrigerant is in a low temperature direction. Due to the phenomenon of dislocation, it was difficult to change the temperature and drying.

In addition, in the existing refrigeration unit there is no big problem in the summer, but in winter, the efficiency of the evaporator 11 is lowered due to the supercooling of the outside air, there was also a problem that the dehumidification effect is lowered.

Existing cold air drying method or heat pump type dryer selects and uses heat exchange evaporator which is used for general air conditioner, which is not suitable in the place where a wide temperature range and subzero operation are required. The dehumidification evaporator used in the air conditioner has a narrow pitch interval between the fin and the heat exchanger, so the lower the temperature inside the drying chamber, the frost (frost) is formed between the fin and the fin, thus losing its original function. The efficiency is lowered.

Due to this problem, in a heat pump type method using cold air drying or system air conditioning, a hot gas pipe is separately installed to remove frost, or an internal condenser is used as an evaporator and an internal condenser is used. In this case, the internal condenser is superimposed in one place to circulate the air in the drying chamber with one transfer fan, which is a method for removing frost.

As shown in FIG. 2, in the circulating method of the first heat exchanger (A; condenser ↔ evaporator) and the second heat exchanger (B; evaporator ↔ condenser), between the narrow fins of the first and second heat exchangers (A, B). The internal drying room air circulates twice, which not only resists the smooth flow of air, but also causes the efficiency of each heat amount to be superimposed on the other evaporator and condenser in one place, resulting in drying time. This will be delayed.

In addition, in the case of operating by attaching several solenoid valves to the refrigerant circulation system, a lot of resistance is given to the circulation system of the refrigerant, and frequent on / off of the solenoid valve is repeated, which causes difficulty in refrigerating the refrigerant and recovering the refrigerated oil. This causes a failure of the compressor.

In the conventional refrigeration unit, even if only one of the solenoid valves malfunctions, frequent repairs are inevitable, resulting in significant losses in terms of economics of the user.

The present invention has been made in order to solve the above problems, an object of the present invention is to provide a dryer that can be operated by freeze drying, cold air drying, hot air drying, high temperature drying according to the characteristics of agricultural and marine products, one freezer warehouse and It is possible to provide a freezer unit that can be used smoothly by enabling a stable operation over a wide temperature range by enabling the use of a variety of modes as described above.

In order to achieve the above object, the present invention provides an expansion valve after the refrigerant in the gaseous state is compressed in a compressor and discharges condensation heat from a plurality of condensers through an oil separator to condense into a liquid state, and then passes through a receiver, a dry and a liquid level gauge, and an intermediate valve. A refrigerator unit, wherein the refrigerator unit is expanded to a low pressure at and evaporated to a gaseous state in the evaporator and then circulated back to the compressor;

Two refrigerant pipes are branched to the outlet pipe of the oil separator, and one refrigerant pipe is connected in series with a refrigerating solenoid valve and a check valve in series, and the other refrigerant pipe is connected with a drying solenoid valve and a check valve in series. It is connected to the inlet, the outlet of the internal condenser is connected to the outlet of the refrigeration check valve is connected to the inlet of the external condenser, the outlet of the external condenser is provided with a freezer unit which serves as a dryer and a freezer storage connected to the receiver.

Further, in the present invention, a speed controller and a temperature controller are installed in the refrigerant conduit between the external condenser and the receiver, so that two fans installed in the external condenser are controlled by the temperature and pressure of the refrigerant passing through the external condenser. Provide a freezer unit that also serves as a warehouse.

Further, in the present invention, the solenoid valve and the expansion valve connected to the liquid separator in one of the two pipelines connected to the outlet side of the intermediate valve are controlled by the temperature controller of the suction side gas of the compressor, the high pressure of the compressor in the one pipeline The solenoid valve and the expansion valve connected to the head are controlled by the temperature controller installed in the discharge gas pipe of the compressor to stably supply gas to the suction and discharge strokes of the compressor. Provides a freezer unit that combines a dryer and a freezer so that the administration can be done without difficulty.

In the present invention, since the compressor operates stably even at a wide temperature range of 55 ° C. to 25 ° C. in the drying chamber, freeze-drying / freeze-drying / hot-air drying / hot-drying and alternating temperature (freezing + drying) according to the characteristics of agricultural and marine products. By freely operating, it is possible to dry various kinds of agricultural and marine products including persimmon and yellow gwamegi, and when it is not used as a drying room, it can be used as a freezer warehouse below -25 ° C.

Hereinafter, with reference to the accompanying drawings, preferred embodiments that do not limit the present invention will be described in detail.

3 is a view illustrating a refrigerator unit according to a preferred embodiment of the present invention, in which a refrigerant in a gaseous state is compressed in a compressor 100 to discharge condensation heat from a plurality of condensers 120 and 130 through an oil separator 110. After condensation in the state and then expanded to low pressure in the expansion valve 180 through the receiver 140 and dry 150 and the liquid level gauge 160 and the intermediate valve 170 and evaporated in the gas state in the evaporator 190 In the refrigerator unit to be circulated back to the compressor (100); Two refrigerant pipes (L1, L2) are branched to the outlet pipe of the oil separator (110), and the refrigerant solenoid valve (111) and the refrigeration check valve (112) are connected in series to one refrigerant pipe (L1). A drying solenoid valve 113 and a drying check valve 114 are connected in series to the other refrigerant pipe L2 and connected to an inlet of the internal condenser 130, and an outlet of the internal condenser 130 is used for the refrigeration. It is connected to the outlet of the check valve 112 is connected to the inlet of the external condenser 120, the receiver 140 is connected to the outlet of the external condenser 120.

In addition, the two fans 121 and 122 installed in the external condenser 120 may have a speed between the external condenser 120 and the receiver 140 so as to be controlled by the temperature and pressure of the refrigerant passing through the external condenser 120. The controller 115 and the temperature controller 116 are provided.

In the present invention, the outlet side of the receiver 140 is connected to the dry 150 and the liquid level gauge 160, the refrigerant is supplied to the expansion valve 180 through the intermediate valve 170 to the low pressure after the evaporator 190 The liquid refrigerant is evaporated to take the latent heat of evaporation, and is then supplied to the compressor 100 again.

In the figure, reference numeral 200 denotes a filter installed on the outlet side of the evaporator 190, and reference numeral 210 denotes a liquid separator installed between the filter 200 and the compressor 100.

In the present invention, a pressure controller 117 is installed between the liquid level gauge 160 and the intermediate valve 170, and two pipelines L3 and L4 branch at the outlet of the intermediate valve 170, and thus the one side pipeline. An expansion valve 180 is connected to the L3, and the high pressure head side and the liquid separator 210 of the compressor 100 are passed through the solenoid valve L4 through the solenoid valves 220 and 230 and the expansion valves 240 and 250, respectively. The refrigerant is to be supplied.

In the figure, reference numeral 118 denotes a temperature controller installed between the liquid separator 210 and the compressor 100, and reference numeral 119 denotes a temperature controller installed at the outlet side of the compressor.

In addition, in the present invention, a pressure equalizing pipe (L5) is installed in the conduit between the outlet side of the expansion valve (180) and the outlet side of the evaporator (190) and the filter, so that the high pressure side and the evaporator (190) before the expansion valve (180). The low pressure side passing through the equalization pressure is achieved, the equalization pipe (L5) is to compensate for the pressure of the refrigerant dropped through the expansion valve 180, the equalization pipe (L5) is the expansion valve ( 180) by itself to detect the pressure difference before and after the expansion valve 180 serves to offset the effect of the pressure drop by bypassing the refrigerant not condensed into the pressure equalizing pipe (L5), such a pressure equalizing pipe is an air conditioner or cooling Since it is a technique known by a person of ordinary skill in the field of circuits and the like, a detailed description thereof will be omitted.

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

First, as shown in FIG. 4, the flow of the refrigerant during refrigeration is compressor 100 → oil separator 110 → refrigeration solenoid valve 111 → refrigeration check valve 112 → external condenser 120 → sap. Machine 140 → dry 150 → liquid level gauge 160 → intermediate valve 170 → expansion valve 180 → evaporator 190 → filter 200 → liquid separator 210 and then back to compressor 100 Circulated.

During such freezing, the refrigerant accumulated in the internal condenser 130 is introduced into the refrigerant flow direction of the external condenser 120, so that the internal condenser 130 primarily plays another fluid role. Since the car stores the refrigerant in the conventional receiver 140, since the refrigerant is stored in a double manner as in the conventional pump-down method, the shortage of the refrigerant can be prevented even at a low temperature.

On the other hand, the flow of the refrigerant during drying, as shown in Figure 5, compressor 100 → oil separator 110 → drying solenoid valve 113 → drying check valve 114 → internal condenser 130 → external Condenser 120 → receiver 140 → dry 150 → liquid level gauge 160 → intermediate valve 170 → expansion valve 180 → evaporator 190 → filter 200 → liquid separator 210 Again circulated to the compressor (100).

In this drying process, the high-temperature / high-pressure refrigerant gas inside the internal condenser 130 passes through the external condenser 120, thereby exchanging heat with the outside air, so that the two external condenser fans 121 and 122 are controlled by the temperature controller 116 and the speed. The liquid phase of a normal gas is formed by the controller 115 and the pressure controller 117 to supply and store the liquid to the receiver 140.

In addition, even when the temperature inside the drying chamber increases during drying, there is no load variation of the compressor 100 and the compressor is stably controlled by controlling the suction and discharge gas temperatures of the compressor 100 by the solenoid valves 220 and 230 and the expansion valves 240 and 250. It can be operated, which is to ensure a smooth supply of the refrigerant supplied to the compressor 100 at the outlet side of the intermediate valve 170, the solenoid valve connected to the liquid separator 210 in one side (L4) ( 230 and expansion valve 250 is controlled by a temperature controller 118 for sensing the temperature of the intake gas of the compressor 100, the solenoid valve connected to the high pressure head of the compressor 100 in one side (L4) 220 and expansion valve 240 is controlled by a temperature controller 119 that senses the temperature of the discharge side gas of the compressor 100 to stably supply gas to the suction and discharge stroke of the compressor 100 to dry inside The compressor's stroke can be made smoothly even when the temperature of the image is below zero.
That is, when the temperature of the refrigerant sensed by the temperature controller 118 installed on the suction side of the compressor 100 is high temperature (high temperature dry mode), the temperature controller 118 is the solenoid valve 230 and the expansion valve 250. To open the refrigerant so that the refrigerant is supplied from the intermediate valve 170 to the liquid separator 210 without passing through the expansion valve 180 and the evaporator 190 to lower the temperature of the refrigerant supplied to the compressor 100. When the temperature of the refrigerant sensed by the temperature controller 119 installed at the outlet side of the compressor 100 is high, the temperature controller 119 opens the solenoid valve 220 and the expansion valve 240 so that the refrigerant is By directly feeding the intermediate valve 170 toward the high pressure head of the compressor 100, the compressor 100 is controlled to lower the temperature of the refrigerant discharged from the compressor 100.

6 is a schematic cross-sectional view of a drying chamber in which a refrigerator unit according to the present invention is installed, and an evaporator 190 is installed above the drying chamber C and an internal condenser 130 is installed below the evaporator 190. Since the fan is installed in each of the internal condenser 130, it generates heat and dehumidification, dehumidifies the steam of high temperature and humidity rising to the upper side, and the internal condenser 130 installed in the lower portion of the air inside the drying chamber C circulates. While the cold air flows to the bottom rather than the top is to generate heat from the bottom.

On the other hand, the evaporator 190 in the present invention by using a freezing evaporator with a pitch between the pins so as not to get stuck in drying, and adopts an electric defrosting method when dedicated to refrigeration.

On the other hand, in the dedicated refrigeration mode, the fan of the blower (W) and the internal condenser 130 which transfers the air inside the drying chamber (C) is stopped, and only the fan of the evaporator 190 rotates in the reverse direction during drying to perform the function of the freezer. Do it.

Referring to the temperature drying in the present invention as follows.

The refrigeration solenoid valve 111 is turned on in the freezing mode when drying at room temperature, and the drying solenoid valve 113 is in the off state. The valve 113 is ON and after several seconds the set time elapses the solenoid valve 111 for refrigeration is turned off to be dried. When the drying mode ends, the valve 113 returns to the same state as the first time. As the solenoid valves 111 and 113 are switched, even if the compressor 100 continues to perform suction and compression, the gas flow is freely undisturbed and no trouble occurs in the compressor.

On the other hand, in the dedicated refrigeration mode, the freezing temperature can be set within the range of 0 ℃ ~ -25 ℃, and the defrost interval can be set freely within the range of 1 hour ~ 24 hours. If only the evaporator 190 operates, the fan of the internal evaporator 190 is controlled to rotate in the reverse direction to function as a pure freezer.

In addition, in the variable temperature (freezing + drying) drying mode, the freezing time can be set within the range of 30 minutes to 24 hours, depending on the drying characteristics of agricultural products, and the freezing temperature can be set within the range of -25 ℃ to +55 ℃. The drying time can be set within 30 minutes to 24 hours, the drying temperature can be set within the range of -25 ℃ to + 55 ℃, and the operating frequency can be set freely within 15 times. , Temperature compensation is set to ± 10 ℃.

On the other hand, in the drying only mode, it is possible to set a variety of drying time, drying temperature, moisture absorption time and temperature correction.

As described above, in the present invention, when the temperature inside the drying chamber increases during drying, the compressed refrigerant gas of the high temperature / high pressure from the internal condenser exchanges heat with the outside while passing through the external condenser to form a liquid gas to store in the receiver. Stable refrigeration cycle is achieved. Conditions that can satisfy this condition are based on the temperature and pressure of the refrigerant in the speed controller 115, the temperature controller 116, and the pressure controller 117 connected to the external condenser 120. The two fans 121 and 122 can be speed-operated, respectively.

In addition, the solenoid valve 230 and the expansion valve 250 connected to the liquid separator 210 from one side line L4 of the two line lines L3 and L4 connected to the outlet side of the intermediate valve 170 may be the compressor 100. The solenoid valve 220 and the expansion valve 240 connected to the high pressure head of the compressor 100 in one side line L4 are controlled by the temperature controller 118 of the suction side gas of the compressor 100. It is controlled by the temperature controller 119 installed in the discharge gas pipe to stably supply gas to the suction and discharge strokes of the compressor 100 so that the stroke of the compressor can be smoothly maintained even when the temperature inside the drying chamber is in the image and sub-zero condition. It can be done.

In the present invention, since the compressor operates stably even at a wide temperature range of 55 ° C. to 25 ° C. in the drying chamber, freeze-drying / freeze-drying / hot-air drying / hot-drying and alternating temperature (freezing + drying) according to the characteristics of agricultural and marine products. By freely operating, it is possible to dry various kinds of agricultural and marine products including persimmon and yellow gwamegi, and when it is not used as a drying room, it can be used as a freezer warehouse below -25 ° C.

1 is a circuit diagram of a conventional heat pump type refrigeration unit,

2 is a block diagram of a conventional heat exchanger,

3 is a circuit diagram of a refrigerator unit according to the present invention;

4 is a refrigerant flow chart during refrigeration,

5 is a refrigerant flow chart when drying,

6 is a cross-sectional view of the drying chamber according to the present invention.

* Explanation of symbols for main parts of the drawings

100: compressor 110: oil separator

111: solenoid valve for refrigeration 112: check valve for refrigeration

113: solenoid valve for drying 114: check valve for drying

115: speed controller 116: temperature controller

117: pressure controller 118,119: temperature controller

120: external condenser 130: internal condenser

140: receiver 150: dry

160: liquid level gauge 170: intermediate valve

180: expansion valve 190: evaporator

L1, L2: Refrigerant pipe

Claims (3)

delete delete The refrigerant in the gaseous state is compressed in the compressor 100, discharges condensation heat from the plurality of condensers 120 and 130 via the oil separator 110, and condenses into a liquid state, and then the receiver 140, the dry 150, and the liquid level gauge 160. And expands to a low pressure state in the expansion valve 180 through the intermediate valve 170 and is evaporated in a gaseous state in the evaporator 190 and then circulated back to the compressor 100, the outlet pipe of the oil separator 110 The two refrigerant pipes L1 and L2 are branched, and the refrigerant solenoid valve 111 and the refrigeration check valve 112 are connected in series to one refrigerant pipe L1, and the electrons for drying are connected to the other refrigerant pipe L2. The valve 113 and the drying check valve 114 are connected in series and connected to the inlet of the internal condenser 130, and the outlet of the internal condenser 130 is connected to the outlet of the refrigeration check valve 112. Is connected to the inlet of the external condenser 120, the receiver 140 is connected to the outlet of the external condenser 120, A speed controller 115 and a temperature controller 116 are installed between the sub-condenser 120 and the receiver 140, and a pressure controller 117 is installed between the liquid level gauge 160 and the intermediate valve 170. In the refrigerator unit to control the driving speed of the fan (121,122) installed in the external condenser 120 in accordance with the temperature and pressure of the refrigerant passing through the condenser (120); At the outlet of the intermediate valve 170, two pipe lines L3 and L4 are branched so that an expansion valve 180 is connected to one pipe line L3, and a solenoid valve 220 and 230 are connected to the other pipe line L4, respectively. The refrigerant is supplied to the high pressure head side of the compressor 100 and the liquid separator 210 between the evaporator 190 and the compressor 100 through the expansion valves 240 and 250, and the inlet side of the compressor 100. Temperature controllers 118 and 119 are installed at the outlet side, so that the solenoid valve 230 and the expansion valve 250 are controlled by the temperature controller 118, and the solenoid valve 220 and the expansion valve 240 are the temperature. A refrigerator unit having both a dryer and a freezer, characterized by being controlled by the controller 119.

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