KR101977901B1 - Cryogenic Freezer - Google Patents

Abstract

The present invention relates to an ultra-low power inverter type cryogenic freezer. The purpose of the present invention is to provide an ultra-low power inverter type cryogenic freezer capable of reducing the temperature difference between the upper and lower parts of a freezer compartment, as well as reducing the time and electricity consumption required to control the freezer compartment at a cryogenic temperature. The present invention comprises: a main body including a freezer compartment; an inverter compressor configured to compress and discharge a refrigerant and adjust the capacity of the refrigerant to be compressed; a condenser for inducing condensation of the refrigerant compressed by the inverter compressor; an expansion valve made to depressurize the refrigerant condensed by the condenser, and comprising a plurality of capillaries having independent structures and a distributor for uniformly distributing the refrigerant to the plurality of capillaries; an evaporator configured to perform freezing of the freezer compartment through evaporation of the refrigerant depressurized by the expansion valve, and comprising a plurality of evaporation tubes connected to the plurality of capillaries in a one-to-one structure and installed in an independent structure on each side of the main body; a double pipe for cooling the refrigerant flowing to the expansion valve through heat exchange between the refrigerant flowing from the condenser to the expansion valve and the refrigerant returned from the evaporator to the compressor; and a pressure reducing unit installed in a discharge pipe connected to the condenser from the inverter compressor to lower the pressure of the refrigerant discharged from the inverter compressor.

Description

Ultra Low Power Inverter Cryogenic Freezer

The present invention relates to an ultra-low power inverter type cryogenic freezer, and more particularly, the circulation structure of the refrigerant is improved to uniformly distribute the refrigerant to various aspects of the freezer, thereby controlling the freezer at a uniform temperature as a whole. The present invention relates to an ultra-low power inverter type cryogenic freezer configured to rapidly freeze at an ultra low temperature and to reduce the amount of electricity required to freeze the freezer at an ultra low temperature by using an inverter compressor to increase energy use efficiency.

Refrigerators and freezers generally have a compressor, a condenser, an expander and an evaporator, and are configured to cool using a cooling cycle of compression-condensation-expansion-evaporation.

On the other hand, the cooling cycle is a compression cycle for compressing the gaseous refrigerant at a high temperature-high pressure through operation of the compressor, a condensation cycle for condensing and liquefying the gas compressed at high temperature-high pressure, an expansion cycle for lowering the pressure of the condensed gas, It consists of an evaporation cycle of vaporizing the lowered refrigerant to lower the temperature of the freezer compartment.

Method of improving cooling efficiency by installing a double pipe between the condenser and the expander in the refrigerator and freezer that perform cooling or freezing by using such a cooling cycle, and cooling the refrigerant discharged from the condenser with the low / low pressure refrigerant discharged from the evaporator. Is being used.

On the other hand, the double pipe is composed of a first refrigerant pipe for connecting the condenser and the expander, and a second refrigerant pipe for connecting a portion of the first refrigerant pipe is located inside and connecting the evaporator and the compressor, According to this, the supercooling of the refrigerant discharged from the condenser through heat exchange between the refrigerant discharged from the condenser and the refrigerant returned from the evaporator improves the cooling effect of the cooling cycle consisting of the compressor-condenser-expander-evaporator.

As an example of a refrigerator using such a double tube, Patent Document 1 (Patent No. 10-0836824) has been proposed. Patent document 1 uses dry ice (carbon dioxide) as a refrigerant, and in order to minimize the volume increase by the accumulator, a first passage connected to the outlet side of the gas cooler and a second passage connected to the outlet side of the evaporator are provided. It is configured to mutual heat exchange.

In this case, the first passage flows downwardly of the main body so that the refrigerator main body is compactly installed without a separate accumulator.

However, as shown in FIG. 5 of Patent Document 1, Patent Document 1 constitutes a double tube in a laminated coil shape, so the volume of the double tube itself has a limitation in implementing a refrigerator compactly, and dry ice should be used as a refrigerant. In addition, the accumulator is removed by lowering the refrigerant flow in the double pipe rather than increasing the cooling efficiency by using the double pipe, and technical considerations for rapid freezing are excluded.

On the other hand, the ultra-low temperature freezer that sets the volume of the double pipe to 70% to 130% compared to the evaporation pipe so that the temperature of the coolant is blown to the ultra-low temperature set rapidly as the cooling cycle of the coolant is repeated, Patent Document 2 (Registration No. 10) -1438155).

On the other hand, in applying the double tube disclosed in Patent Document 2 to the cryogenic freezer, the refrigerant pre-cooled through the double tube to cool the freezer compartment provided in the freezer while passing through all three sides of the freezer through one evaporation tube.

However, when one evaporator tube is configured to pass through three sides of the freezer as described above, the temperature of the upper and lower portions of the freezer compartment is different so that the effective freezing and storage of the storage is difficult, and the freezing chamber is rapidly lowered to an extremely low temperature of minus 80 degrees or less. There is a problem that the required time and the amount of electricity used increases.

Registered Patent Publication No. 10-0836824 (announced June 11, 2008)

The present invention has been made in consideration of the above problems, and an object of the present invention is not only to reduce the temperature difference between the upper and lower parts of the freezer compartment, but also to save the time and electricity required for controlling the freezer compartment at an ultra low temperature, and an ultra low power inverter type ultra low temperature In providing a freezer.

Another object of the present invention is to provide an ultra-low power inverter type cryogenic freezer configured to prevent damage due to overheating or overpressure of the inverter compressor through effective decompression of the refrigerant discharged from the inverter compressor.

The present invention to achieve the object as described above and to perform the problem for eliminating the conventional defects the main body including a freezer; An inverter compressor configured to compress and discharge the refrigerant and adjust a capacity of the refrigerant to be compressed; A condenser for inducing condensation of the refrigerant compressed by the inverter compressor; An expansion valve made to reduce the refrigerant condensed by the condenser, the expansion valve comprising a plurality of capillaries having independent structures and a distributor for distributing the refrigerant evenly to the plurality of capillaries; An evaporator configured to perform freezing of the freezing chamber through evaporation of the refrigerant decompressed by the expansion valve, the evaporator comprising a plurality of evaporating tubes connected to the plurality of capillaries in a one-to-one structure and installed in an independent structure on each side of the main body; A double pipe for cooling the refrigerant flowing to the expansion valve through heat exchange between the refrigerant flowing from the condenser to the expansion valve and the refrigerant returned from the evaporator to the compressor; And a pressure reducing unit installed in a discharge pipe connected to the condenser from the inverter compressor to lower the pressure of the refrigerant discharged from the inverter compressor.

Meanwhile, in the ultra low power inverter type cryogenic freezer, the pressure reducing unit includes: an expansion container having a cross sectional area larger than a cross sectional area of the discharge pipe so as to induce the pressure reduction of the refrigerant through expansion of the refrigerant flowing through the discharge pipe; And a resistance plate disposed to face the refrigerant introduced into the expansion container within the expansion container, and formed to be curved to have a concave curved surface facing the refrigerant flowing into the expansion container.

Meanwhile, in the ultra-low power inverter type cryogenic freezer, the distributor is connected to a pipe connected to the expansion valve from the double pipe, and one inlet for receiving refrigerant is formed at one end, and a distribution space connected to the inlet is formed at the other end. A first member consisting of; And a front end surface spaced apart from the bottom surface of the distribution space while being inserted into the distribution space, and extended from the front surface to the rear surface and coupled with a capillary tube to form a refrigerant capillary tube. And a second member made of a plurality of outlets for transmitting and a distribution cone formed in a conical structure protruding toward the bottom surface of the distribution space from the center of the front end surface.

Meanwhile, in the ultra-low power inverter type cryogenic freezer, the bottom surface of the distribution space may be inclined in a conical structure so as to be parallel to the surface of the distribution cone.

Meanwhile, in the ultra-low power inverter type cryogenic freezer, a stopper may be formed inside the inlet and the outlet to restrict the condensation pipe and the capillary tube to be inserted into the correct position according to a design value.

Meanwhile, in the ultra-low power inverter type cryogenic freezer, between the evaporator and the double tube, the refrigerant returned from each evaporator tube is collected and transferred to the double tube, and a U-trap portion formed to be bent to collect the liquid contained in the refrigerant may be further installed. have.

On the other hand, in the ultra-low power inverter type cryogenic freezer, the evaporation tube is composed of three may be installed on the left side and the right side and the back of the main body, respectively.

Meanwhile, in the ultra-low power inverter type cryogenic freezer, it is installed in a pipe connected to the double pipe from the condenser and induces cooling of the refrigerant flowing into the double pipe through heat exchange between the refrigerant returned from the double pipe to the compressor and the refrigerant flowing into the double pipe from the condenser. Cooling unit to; A branch pipe branched from the pipe at the front end of the inlet of the cooling unit and connected to the pipe at the rear end of the cooling unit again; An auxiliary capillary tube installed in the branch pipe to reduce and cool the refrigerant flowing through the branch pipe; And a solenoid valve installed on the branch pipe to open and close the flow path of the branch pipe.

On the other hand, in the ultra-low power inverter type cryogenic freezer, the solenoid valve is controlled to open the flow path of the branch pipe until the temperature of the freezer compartment reaches a preset temperature during the initial operation of the freezer, and in addition, when the freezer is restarted in advance. And a controller having a function of controlling the solenoid valve to open the flow path of the branch pipe for a predetermined time.

According to the present invention having the above characteristics, the evaporator tube is disposed on each side of the freezer body, and by distributing the refrigerant to each evaporator tube to circulate, it is possible to freeze the freezer evenly as a whole, energy Increasing the utilization efficiency can be expected to reduce the time and energy required to freeze the freezer to cryogenic temperatures.

In addition, the use of an inverter compressor can be expected to reduce the energy required to maintain the freezer at an ultra-low temperature.

In addition, the distributor for distributing the refrigerant flowing from the double tube to the expansion valve to each evaporation tube can evenly distribute the refrigerant to the plurality of evaporation tube without generating vortex during the distribution of the refrigerant to induce the freezer compartment to be uniformly frozen as a whole. have.

1 is a structural diagram of a super low power cryogenic freezer according to a preferred embodiment of the present invention,
2 is a perspective view of a main body according to the present invention;
Figure 3 is a perspective view showing a state in which the evaporation tube is installed in the main body,
4 is a cross-sectional view of a dispenser according to a preferred embodiment of the present invention;
5 is a perspective view of a dispenser according to a preferred embodiment of the present invention;
6 is a structural diagram of a double pipe applied to the present invention,
7 is a structural diagram of a pressure reducing unit according to a preferred embodiment of the present invention;
8 is a structural diagram of a utrap unit according to a preferred embodiment of the present invention;
9 is a structural diagram of a cooling unit and an auxiliary capillary tube according to the present invention;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a structural diagram of an ultra-low power cryogenic freezer according to a preferred embodiment of the present invention, Figure 2 is a perspective view of the main body according to the present invention, Figure 3 is a perspective view showing a state in which the evaporation tube is installed in the main body, 4 is a cross-sectional view of a dispenser according to a preferred embodiment of the present invention, FIG. 5 is a perspective view of a dispenser according to a preferred embodiment of the present invention, FIG. 6 is a structural diagram of a double pipe applied to the present invention, and FIG. 8 is a structural diagram of a pressure reducing unit according to a preferred embodiment, FIG. 8 is a structural diagram of a utrap portion according to a preferred embodiment of the present invention, and FIG. 9 is a structural diagram of a cooling unit and an auxiliary capillary tube according to the present invention.

Ultra-low power inverter type cryogenic freezer according to the present invention is composed of a main body 110, inverter compressor 120, condenser 130, expansion valve 140, evaporator 150, double pipe 160, decompression unit 170, The inverter compressor 120, the condenser 130, the expansion valve 140, the evaporator 150, and the double pipe 160 are organically connected to form a refrigeration cycle system 100, but two refrigeration cycle systems 100 are Is configured in one main body 110 is configured to enable normal refrigeration while the other refrigeration cycle system 100 is operating during the failure or maintenance work of any one refrigeration cycle system (100).

That is, the ultra-low power inverter type cryogenic freezer according to the present invention has two inverter compressors 120, two condensers 130, two expansion valves 140, two evaporators 150 and two in one body 110. The double pipe 160 is installed to include two refrigeration cycle systems 100 that operate independently.

As described above, the freezer including the two freezing cycle systems 100 may prevent the deterioration of the storage due to the stop of the freezing during the breakdown or maintenance work of the components in the medical freezer that stores the biological tissue, blood, and cell tissue.

On the other hand, the two refrigeration cycle system 100 is made of substantially the same configuration, the same reference numerals, and will be described below for only one refrigeration cycle system (100).

The main body 110 includes a freezing compartment 111 in which storage is stored, and one side of the freezing compartment 111 is configured as a door 112 to open and close the door 112 of the freezing compartment 111. It is configured to open and close.

In addition, the lower end of the main body 110 is provided with a space in which the inverter compressor 120, the condenser 130 and the double pipe 160 constituting the refrigeration cycle system 100 is installed.

The inverter compressor 120 is to form a gas refrigerant of high temperature and high pressure by compressing the refrigerant, and is configured to adjust the capacity of the refrigerant to be compressed including the inverter circuit.

Since the inverter compressor 120 adjusts the capacity of the refrigerant to be compressed according to the refrigeration load, the inverter compressor 120 prevents energy loss due to the on-off control of the general compressor.

The condenser 130 is configured to change the high temperature and high pressure gas refrigerant into medium temperature and high pressure liquid refrigerant through heat exchange between the high temperature and high pressure gas refrigerant discharged from the inverter compressor 120.

On the other hand, the filter dryer 131 for absorbing and removing the moisture contained in the condensed refrigerant is installed between the discharge side of the condenser 130, that is, between the condenser 130 and the expansion valve 140.

The expansion valve 140 receives the refrigerant condensed by the condenser 130 to reduce the pressure, and comprises a plurality of capillaries 141 and a distributor 142 that distributes the refrigerant evenly to the plurality of capillaries 141. do.

At this time, each capillary tube 141 is made of winding the thin tube in the form of a coil, one end is connected to the distributor 142, the other end to the evaporator tube 151 constituting the evaporator 150. Connected.

On the other hand, according to a preferred embodiment of the present invention, the capillary tube 141 is composed of three, is connected to one distributor 142 is installed to receive the refrigerant.

The distributor 142 connects the pipe L1 extending from the condenser 130 to the expansion valve 140 and the plurality of capillaries 141 to distribute the condensed refrigerant to the plurality of capillaries 141. And a second member 1422.

The first member 1421 is formed in a cylindrical shape as a whole, and one inlet port 1423 is formed at one end to receive the refrigerant, and is connected to the inlet port 1423 and a part of the second member 1422. Distribution space 1424 configured to be inserted is configured to be formed on the other end.

In this case, the bottom surface 1424a positioned at the innermost side of the distribution space 1424 is formed to be inclined such that the distribution space 1424 has a conical structure.

On the other hand, inside the inlet 1423, a stopper 1425 is formed to limit the insertion of the condensation pipe (L1) so that the condensation pipe (L1) coupled to the distributor 142 is inserted only to the correct depth according to the design value. The stopper 1425 extends along the circumference of the inlet 1423 and is formed to have a structure protruding inwardly of the inlet 1423.

Like the first member 1421, the second member 1422 is formed in a cylindrical shape, and one end thereof is inserted into the distribution space 1424 to be coupled to each other, and a bottom surface 1424a of the distribution space 1424 is provided. ) And a first end surface 1422a having a structure spaced apart from each other, and extending from the front end surface 1422a to the rear end surface 1422b of the second member 1422 and penetrating the second member 1422. A plurality of outlets 1426 and a distribution cone 1227 having a conical structure protruding toward the bottom surface 1424a of the distribution space 1424 are formed at the center of the tip surface 1422a.

Meanwhile, a capillary tube 141 is coupled to the outlet 1426, and a stopper 1428 is formed to limit the insertion of the capillary tube 141 such that the capillary tube 141 is inserted only to a precise depth according to a design value. The protrusion 1428 is formed to have a structure extending along the circumference of the outlet 1426 and protruding inwardly of the outlet 1426.

In addition, the surface of the distribution cone (1427) having a conical structure is formed to have a parallel structure spaced apart from the bottom surface (1424a) of the distribution space (1424).

The first member 1421 and the second member 1422 configured as described above may be fixed by welding while being coupled to each other.

According to the distributor 142 including the first member 1421 and the second member 1422 as described above, it is introduced through the inlet port 1423 formed in the center of the first member 1421 to be ejected into the distribution space 1424. The refrigerant to be distributed is uniformly distributed in all directions by the distribution cone 1427, and in particular, the vortex is prevented from being formed inside the distribution space 1424 by the distribution cone 1423, thereby reducing the refrigerant flowing into the distributor 142. The three capillaries 141 can be smoothly and uniformly distributed.

The evaporator 150 performs freezing of the freezing chamber 111 through evaporation of the refrigerant decompressed by the expansion valve 140, and is composed of a plurality of evaporation tubes 151.

On the other hand, the evaporator 150 according to a preferred embodiment of the present invention evaporate three so that the evaporation tube 151 may be installed on the left side 110a, the right side 110b and the rear surface 110c of the main body 110, respectively. Consists of a tube 151, each evaporation tube 151 is made of a curved structure in a zigzag form.

For reference, as described above, since the freezer according to the present invention is provided with two refrigeration cycle systems 100, substantially two evaporation tubes 151 configured to independently flow refrigerant on each side of the main body 110. ) Is installed.

The double pipe 160 is installed to be located between the condenser 130 and the expansion valve 140, and the refrigerant flowing from the condenser 130 to the expansion valve 140 is returned to the inverter compressor 120 from the evaporator 150. By cooling the refrigerant flowing to the expansion valve 140 through the heat exchange of the refrigerant in advance, it is composed of a first refrigerant pipe 161 and the second refrigerant pipe 162.

The first refrigerant pipe 161 is configured to form a flow path through which the refrigerant flowing from the condenser 130 to the expansion valve 140 flows, and the second refrigerant pipe 162 is a part of the first refrigerant pipe 161. It is configured to form a flow path through which the refrigerant returned from the evaporator 150 to the inverter compressor 120 flows while the section is accommodated inside the first refrigerant pipe 161.

Since the double pipe 160 is already disclosed in Korean Patent Publication No. 10-1438155, a detailed description of the double pipe 160 will be omitted.

The pressure reducing unit 170 is installed in the discharge pipe (L4) connected to the condenser 130 from the inverter compressor 120 to lower the pressure of the refrigerant discharged from the inverter compressor 120, expansion container 171 and It consists of a resistance plate 172.

The expansion container 171 has a cylindrical structure having a larger cross-sectional area than the cross-sectional area of the discharge pipe (L4) to induce a reduced pressure of the refrigerant through the expansion of the refrigerant flowing through the discharge pipe (L4).

The resistance plate 172 is fixedly installed inside the expansion vessel 171, and is formed to be bent as a whole to have a concave curved surface facing the refrigerant flowing into the expansion vessel 171.

That is, the resistance plate 172 has an outer diameter smaller than the inner diameter of the expansion vessel 171, and consists of a plate formed to have a conical structure gradually narrowing along the flow direction of the refrigerant.

The resistance plate 172 formed as described above generates resistance while facing the refrigerant flowing into the expansion container 171, thereby reducing the refrigerant more effectively.

On the other hand, when the compression amount of the refrigerant in the discharge pipe (L4) and the condenser 130 connecting the inverter compressor 120 and the condenser 130 when the inverter compressor 120 is operating, respectively, the operation of the inverter compressor 120 It is possible to provide a smoother operating environment by preventing the current from rising rapidly through the pressure-sensitive action of the refrigerant by the pressure reduction unit 170.

In the refrigeration cycle system 100 consisting of the inverter compressor 120, the condenser 130, the expansion valve 140, the evaporator 150, the double pipe 160, the pressure reducing unit 170 as described above, A utrap unit 180 may be further included to collect the refrigerants returned from the 151 and return the refrigerant to the inverter compressor 120.

The utrap unit 180 has three evaporation tubes 151 to allow refrigerant to be returned from three evaporation tubes 151 installed on the left side 110a, the right side 110b, and the rear side 110c of the main body 110. ) Is configured to have a U-shape bent in the downward direction to maintain a certain amount of liquid contained in the refrigerant.

Since the utrap unit 180 collects the refrigerant discharged from the three evaporation tubes 151 and discharges the refrigerant to the inverter compressor 120, the refrigerant in one of the evaporation tubes 151 is intensively sucked into the compressor and is not discharged. The three evaporator tubes 151 provide a function of allowing the refrigerant to be uniformly sucked into the compressor and a function of preventing air bubbles from flowing together with the refrigerant.

In addition, the refrigeration cycle system 100 includes a cooling unit 190 for inducing heat exchange between the refrigerant returned from the double pipe 160 to the inverter compressor 120 and the refrigerant flowing into the double pipe 160 from the condenser 130; Branch pipe (L3) formed to bypass the cooling unit 190, the auxiliary capillary (200) installed in the branch pipe (L3) to guide the pressure reduction and cooling of the refrigerant, and the flow path of the branch pipe (L3) Solenoid valve 210 for opening and closing may be further included.

The cooling unit 190 is an inverter compressor from the double pipe 160 with the first pipe 191 through which the refrigerant flowing into the double pipe 160 passes through the filter drier 131 and the first pipe 191. The second pipe 192 is configured to flow the refrigerant returned to the 120 is configured to induce heat exchange between the refrigerant flowing out of the double pipe 160 and the refrigerant flowing into the double pipe 160.

The branch pipe (L3) has a structure branched from the pipe (L2) connecting the filter drier 131 and the double pipe (160), branched from the pipe (L2) in front of the inlet of the cooling unit 190 and the cooling unit ( The rear end of the 190 is formed to be connected to the pipe (L2).

Therefore, when the branch pipe L3 is opened, a part of the refrigerant flowing through the pipe L2 flows through the branch pipe L3 and passes through the auxiliary capillary pipe 200.

The auxiliary capillary tube 200 is formed by winding a thin tube in the form of a coil and is configured to induce decompression and cooling of the refrigerant flowing through the branch pipe L3.

The solenoid valve 210 is restarted when the refrigerant needs further depressurization and cooling, i.e., until the temperature of the freezer compartment 111 reaches a preset temperature (ex. Minus 75 degrees) during the initial operation of the freezer and after the freezer stops. Is controlled to open the flow path of the branch pipe L3 for a preset time.

That is, the solenoid valve 210 is formed of a known solenoid valve, and the controller (for a predetermined time until the temperature of the freezer compartment 111 at the initial operation of the freezer reaches a preset temperature and restarts after the freezer is stopped) Switching by the control signal generated in 220 to open the flow path of the branch pipe (L3).

For reference, the controller 220 is made to control the cryogenic freezer as a whole, the load of the inverter compressor 120 by inducing effective cooling and decompression of the refrigerant through the opening of the branch pipe (L3) during the initial operation or restart of the freezer. It may be configured to include a function to reduce the.

By using the cooling unit 190, the branch pipe L3, the auxiliary capillary pipe 200, and the solenoid valve 210, the refrigerant flowing into the double pipe 160 is cooled to a certain degree, and thus the freezing chamber 111 is provided. ) Can be quickly lowered, and the load on the inverter compressor 120 can be reduced to prevent overheating of the inverter compressor 120.

On the other hand, for the insulation of the main body 110, the surface of the main body 110 is provided with a heat insulating material consisting of sealing a heat insulating base material such as styrofoam with a film such as aluminum thin film.

In addition, the ultra-low power inverter type cryogenic freezer according to the present invention configured as described above is preferably using a non-combustible mixed refrigerant as a refrigerant.

The process of the freezing of the freezing chamber 111 in the ultra-low power inverter type cryogenic freezer according to the preferred embodiment of the present invention configured as described above will be described.

The refrigerant passing through the inverter compressor 120, the condenser 130, and the filter drier 131 is provided to the expansion valve 140 while passing through the cooling unit 190 and the double pipe 160, and is provided as the expansion valve 140. Usually forms a subcooled state of minus 70 degrees.

On the other hand, the pressurized refrigerant discharged from the inverter compressor 120 through the discharge pipe (L4) is expanded in the process of flowing into the expansion vessel 171 of the pressure reduction unit 170, the resistance disposed in the expansion vessel 171 The pressure is reduced while colliding with the plate 172.

As such, by properly depressurizing the refrigerant discharged from the inverter compressor 120 using the decompression unit 170, the load applied to the inverter compressor 120 may be reduced, and the large load is continuously applied to the inverter compressor 120. Overheating can prevent damage to key components caused by oxidation of lubricants.

In addition, the refrigerant flowing through the condenser 130 and the double pipe 160 is supplied to the double pipe 160 while being pre-cooled while performing heat exchange with the refrigerant returned to the inverter compressor 120 in the course of passing through the cooling unit 190. In particular, by allowing the refrigerant to pass through the auxiliary capillary 200 through the opening of the solenoid valve 210 during the initial operation or restart of the freezer, it is possible to induce cooling and depressurization of the refrigerant more effectively. It is possible to further reduce the load on the.

Meanwhile, the refrigerant provided to the expansion valve 140 is uniformly distributed to the three capillaries 141 through the distributor 142, and the three capillaries 141 are the left side 110a and the right side 110b of the main body 110. And the refrigerant decompressed to the three evaporation pipes 151 installed on the rear surface 110c are expanded.

On the other hand, the refrigerant ejected to the evaporation tube 151 is vaporized while absorbing the surrounding heat at a temperature of about 120 degrees below zero, the freezing chamber 111 by the action of such a refrigerant to maintain the ultra-low temperature state.

In particular, as the refrigerant is independently supplied to the three evaporation tubes 151 provided on the left side 110a, the right side 110b, and the rear side 110c of the main body 110, the temperature of the freezer compartment 111 is rapidly low. Not only can be made, it is possible to prevent the temperature difference occurs in the upper and lower parts of the freezer compartment 111 can be stored more securely.

On the other hand, the refrigerant discharged from the three evaporation tube 151 is collected in the utrap unit 180, in which the liquid contained in the coolant is collected in the utrap unit 180 and prevents the air bubbles flowing with the refrigerant In addition, since a certain amount of refrigerant is always returned to the compressor, the refrigerant can be smoothly flown and the velocity of the refrigerant distributed through the three evaporation tubes 151 is maintained at a uniform speed through the evaporation tube 151 to maintain the body 110. The left side surface 110a, the right side surface 110b, and the rear surface 110c of the side surface can be cooled to the same temperature.

As described above, the freezer according to the present invention includes a plurality of expansion tubes and a plurality of evaporation tubes 151, each of the left side 110a and the right side 110b and the rear side 110c of the main body 110. As the refrigerant is configured to refrigerate the freezing compartment 111, the energy use efficiency may be increased to reduce the use of electricity required for refrigeration, and the same refrigeration effect may be realized by using a compressor having less horsepower than the related art.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

<Explanation of symbols for the main parts of the drawings>
110: main body 111: freezer
120: inverter compressor 130: condenser
140: expansion valve 141: capillary tube
142: dispenser 1421: first member
1422: second member 1423: inlet
1424: distribution space 1425: stopper
1426: outlet 1427: distribution cone
1428: stopper 150: evaporator
151: evaporation tube 160: double tube
170: pressure reduction unit 171: expansion container
172: resistance plate 180: utrap portion
190: cooling unit 200: auxiliary capillary
210: solenoid valve 220: controller

Claims (9)

A main body 110 including a freezing compartment 111;
An inverter compressor 120 configured to compress and discharge the refrigerant and adjust a capacity of the refrigerant to be compressed;
A condenser 130 for inducing condensation of the refrigerant compressed by the inverter compressor 120;
It is made to reduce the refrigerant condensed by the condenser 130, the expansion valve consisting of a plurality of capillary tube 141 having an independent structure and the distributor 142 to distribute the refrigerant evenly to the plurality of capillary tube (141) ( 140);
It is made to perform the freezing of the freezing chamber 111 through the evaporation of the refrigerant decompressed by the expansion valve 140, it is connected in a one-to-one structure with the plurality of capillaries 141, independent structure on each side of the main body 110 Evaporator 150 consisting of a plurality of evaporation tube 151 formed to be installed;
A double pipe 160 for cooling the refrigerant flowing to the expansion valve 140 through heat exchange between the refrigerant flowing from the condenser 130 to the expansion valve 140 and the refrigerant returned from the evaporator 150 to the compressor; And
Ultra low power, characterized in that it includes; a pressure reducing unit 170 is installed in the discharge pipe (L4) connected to the condenser 130 from the inverter compressor 120 to lower the pressure of the refrigerant discharged from the inverter compressor 120 Inverter type cryogenic freezer. The method according to claim 1,
The pressure reduction unit 170,
Expansion container 171 having a cross-sectional area larger than the cross-sectional area of the discharge pipe (L4) to induce a reduced pressure of the refrigerant through the expansion of the refrigerant flowing through the discharge pipe (L4); And
The resistance plate is disposed to face the refrigerant introduced into the expansion container 171 inside the expansion container 171, and the resistance plate formed to be curved to have a concave curved surface facing the refrigerant flowing into the expansion container 171. Ultra low power inverter type cryogenic freezer, characterized in that consisting of. The method according to claim 1,
The distributor 142,
One inlet port 1423 is connected to the pipe connected to the expansion valve 140 from the double pipe 160 to receive the coolant at one end, and the distribution space 1424 connected to the inlet 1423 is at the other end. A first member 1421 consisting of formed; And
It is made to be inserted into the distribution space 1424 and coupled to the front end surface (1422a) facing the bottom surface 1424a of the distribution space 1424, and from the front end surface (1422a) to the rear end surface (1422b) A plurality of outlets 1426 formed to extend and coupled with the capillary tube 141 to transfer the refrigerant distributed in the distribution space 1424 to the capillary tube 141, and a distribution space 1424 at the center of the front end surface 1422a. Ultra-low power inverter type cryogenic freezer, characterized in that consisting of; second member (1422) consisting of a distribution cone (1427) formed in a conical structure protruding toward the bottom surface (1424a) of the. The method according to claim 3,
Ultra low power inverter type cryogenic freezer, characterized in that the bottom surface (1424a) of the distribution space (1424) is inclined in a conical structure parallel to the surface of the distribution cone (1427). The method according to claim 3,
Ultra low-power inverter type cryogenic freezer, characterized in that the stopper (1425, 1428) is formed inside the inlet (1423) and outlet (1426) to limit the condensation pipe and capillary tube 141 is inserted into the correct position according to the design value . The method according to claim 1,
Between the evaporator 150 and the double tube 160 collects the refrigerant returned from each evaporation tube 151 and transfers the refrigerant to the double tube 160, the u-trap portion 180 is formed to be bent to the liquid contained in the refrigerant Ultra low-power inverter type cryogenic freezer, characterized in that more installed. The method according to claim 1,
The evaporation tube 151 is composed of three ultra-low power inverter type cryogenic freezer, characterized in that installed on the left side (110a) and the right side (110b) and the back (110c) of the main body (110), respectively. The method according to claim 1,
It is installed in the pipe connected to the double pipe 160 from the condenser 130, the double pipe 160 through heat exchange between the refrigerant returned from the double pipe 160 to the compressor and the refrigerant flowing from the condenser 130 to the double pipe 160. Cooling unit 190 to induce the cooling of the refrigerant flowing into;
A branch pipe (L3) branched from the pipe at the front end of the inlet of the cooling unit 190 and connected to the pipe at the rear end of the cooling unit 190 again;
An auxiliary capillary tube 200 installed at the branch pipe L3 to reduce and cool the refrigerant flowing through the branch pipe L3; And
Ultra-low power inverter type cryogenic freezer, characterized in that it further comprises; a solenoid valve 210 installed in the branch pipe (L3) to open and close the flow path of the branch pipe (L3). The method according to claim 8,
During the initial operation of the freezer, the solenoid valve 210 is controlled to open the flow path of the branch pipe L3 until the temperature of the freezer compartment 111 reaches a preset temperature, and is set in advance when the freezer is restarted. And a controller 220 having a function of controlling the solenoid valve 210 to open the flow path of the branch pipe L3 for a time period.

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