KR101949090B1 - deep freezer using induction pipe - Google Patents

Abstract

The present invention relates to a cryogenic freezer using an induction pipe and, more specifically, relates to a cryogenic freezer, which can control volume of a double pipe without additional refrigerant, and rapidly perform refrigeration under a temperature less than 80 degrees below zero. According to an embodiment of the present invention, the cryogenic freezer comprises: a compressor (110); a condenser (120); a double pipe (140); an expansion pipe (150); and an evaporator (160).

Description

[0001] The present invention relates to a deep freezer using induction pipe,

The present invention relates to a cryogenic freezer using a suction pipe, more particularly, to a method for controlling a volume of a double tube without using a separate refrigerant and shortening a time required for expansion in the evaporator by pre- The present invention relates to a super ultra-low temperature freezer capable of rapid freezing at a temperature of minus 80 degrees or less even in a refrigerator having a conventional structure by preventing a superheat by performing a process of simultaneous expansion when the compressor is operated.

The refrigerator has a compressor, a condenser, an inflator and an evaporator, and is configured to cool the freezer using a cooling cycle of compression-condensation-expansion-evaporation.

The cooling cycle includes a compression cycle in which gaseous refrigerant is compressed to a high temperature and a high pressure through the operation of the compressor, a condensation cycle in which the compressed gas is condensed by condensing the compressed gas at high temperature and high pressure, an expansion cycle in which the pressure of the condensed gas is lowered, And an evaporation cycle in which the temperature of the freezing chamber is lowered by vaporizing the lowered refrigerant.

A double tube is connected between the condenser and the inflator in the refrigerator having the above-mentioned cooling cycle, and the cooling efficiency of the refrigerator is improved by cooling the refrigerant discharged from the condenser by the low-temperature / low-pressure refrigerant discharged from the evaporator.

At this time, the double tube may include a first refrigerant pipe and a second refrigerant pipe for receiving the first refrigerant pipe and the first refrigerant pipe from the condenser to the inflator, and connected between the evaporator and the compressor. The cooling effect of the cooling cycle constituted by the compressor-condenser-expander-evaporator can be improved by sufficiently cooling the refrigerant discharged from the condenser by using the double tube.

Korean Patent No. 10-0836824 has been proposed as an example of a refrigerator using a double tube. Patent Document 10-0836824 discloses a gas cooler that uses dry ice (carbon dioxide) as a refrigerant and has a first flow path connected to the outlet side of the gas cooler and a second flow path connected to the outlet side of the evaporator to minimize volume increase due to the accumulator. Let the flow of heat exchange with each other.

In this case, the first flow path moves downward of the main body, so that the refrigerator main body is compactly mounted without mounting the separate accumulator. However, as shown in FIG. 5 of Patent Document 10-0836824, since the double tube is formed in the form of a laminated coil, the volume of the double tube itself is limited to realize a compact refrigerator, It should be used as a refrigerant. Instead of increasing the cooling efficiency by using the double tube, the refrigerant flow of the double tube is lowered to remove the accumulator, but the technical consideration for the rapid freezing is excluded.

Korea Patent Office Registration No. 10-0836824

An object of the present invention is to provide a refrigerating apparatus and a refrigerating apparatus which can prevent refrigerant discharged from a condenser and a refrigerant discharged from an evaporator from being set to 70% to 130% of a volume evaporation tube of a double tube for performing heat exchange, Temperature freezer.

Specifically, the present invention provides a very ultra-low temperature freezer capable of preventing a superheat by performing a pre-cooling process before a dual pipe line to shorten the expansion time in an evaporator and performing a process of expanding at the same time when the compressor is operated, .

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

The cryogenic freezer according to an embodiment of the present invention for realizing the above-mentioned problems includes a compressor (110) for compressing a refrigerant to increase pressure; A condenser 120 for cooling the refrigerant to take heat and change the condensation; A dual pipe 140 for lowering the temperature of the refrigerant; An expansion pipe (150) for reducing the pressure of the refrigerant; And an evaporator (160) having an evaporation pipe for freezing by introducing the decompressed refrigerant and performing heat exchange, wherein the double pipe (140) comprises a first refrigerant pipe (141) connected between the condenser and the expansion pipe ); And a second refrigerant pipe (142) accommodating the first refrigerant pipe (141) therein to form a double pipe and connected between the evaporator (160) and the compressor (110) A cooling unit 190 is provided between the dual pipe 140 and the double pipe 140 to perform a line cooling process before the refrigerant is introduced into the double pipe 140 to shorten the operation time of the evaporator 160. And the refrigerant flowing into and discharged from the dual pipe 140 through the evaporator 160 is precooled between the double pipe 140 and the compressor 110 before the refrigerant is introduced into the compressor 110 And a cooling pipe 200 for preventing the compressor 110 from overheating.

The filter dryer 130 further includes a filter dryer 130 disposed between the first refrigerant tube 141 and the condenser 120 to remove moisture and foreign substances from the refrigerant discharged from the condenser 120, And a condensing pipe 210 for shortening the operating time of the evaporator 160 by performing a line cooling process between the double pipe 140 and the double pipe 140 before the refrigerant is introduced into the double pipe 140 can do.

The volume of the second refrigerant tube 142 is 70% to 130% of the volume of the first refrigerant tube 141, and the volume of the first refrigerant tube 141 is the same as the volume of the first refrigerant tube 141, The first volume and the outer diameter calculated for the first refrigerant tube 141 and the second volume calculated for the second refrigerant tube 142 are obtained by subtracting the first volume from the second volume It can be volumetric.

In addition, the second refrigerant pipe 142 may have the same length as the evaporation pipe, and the volume of the second refrigerant pipe 142 may coincide with the inner diameter of the evaporation pipe.

In addition, the first refrigerant pipe 141 and the second refrigerant pipe 142 may be arranged such that the directions of movement of the refrigerant are opposite to each other.

According to the present invention, the double tube is formed such that the refrigerant discharged from the condenser and the refrigerant discharged from the evaporator perform a heat exchange in such a manner that the body of the double tube is 70% to 130% of the volume of the evaporator tube. The temperature can be rapidly lowered to a very low temperature.

In addition, the present invention provides a ultra-low temperature freezer capable of preventing overheating by simultaneously performing a pre-cooling process before the dual pipe introduction to shorten the expansion time in the evaporator and expanding simultaneously when the compressor is operated, Can be solved.

It should be understood, however, that the effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

FIG. 1 is a perspective view of an ultra low temperature freezer according to an embodiment of the present invention.
2 is a view for explaining a refrigeration cycle of the ultra low temperature freezer according to the embodiment of the present invention.
Fig. 3 shows a practical example of the ultra-low temperature freezer shown in Fig.
Figs. 4A and 4B show a specific example of the cooling and expansion parts shown in Fig. 2. Fig.
FIG. 5 shows a specific example of the freezing chamber and the main body of the ultra-low temperature freezer shown in FIG.
Figs. 6 and 7 show reference views for an example of the double tube shown in Fig.
Figure 8 shows a reference diagram of a method for determining the volume of a double tube in accordance with an embodiment of the present invention.
FIG. 9 shows a concrete embodiment of the condenser shown in FIG. 2. FIG.

The evaporator referred to in this specification is composed of an evaporator tube, in which the evaporator and the evaporator tube can be described in terms of their meanings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

FIG. 1 is a perspective view of an ultra low temperature freezer 100 according to an embodiment of the present invention. FIG. 2 is a view for explaining a refrigeration cycle of the ultra low temperature freezer 100 according to an embodiment of the present invention. do.

In the present invention, a plurality of compressors 110, a condenser 120, a double tube 140, and cooling and expanding units 190, 200 and 210, which will be described later, may be provided. In order to avoid confusion, Etc. However, the functions of the respective components can be applied equally.

Referring to FIGS. 1 and 2 together, the ultra low temperature freezer 100 according to the embodiment includes a main body 103 and a freezing chamber 101. The freezing chamber 101 can accommodate living tissue, blood, have. The freezing chamber 101 may be provided with a transparent window so that it can be seen from the outside.

In this case, the transparent window may be composed of a double glass having a vacuum layer in consideration of the temperature of the freezing chamber 101 of -80 degrees.

The condenser 120 and the compressor 110 can be accommodated in the lower end of the ultra-low temperature freezer 100, and the double pipe 140 can be accommodated in the back.

As described above, a plurality of condensers 120, compressors 110, and double tubes 140 may be applied to the present invention.

Referring to FIG. 2, a first condenser 120A, a first compressor 110A, a first double tube 140A and the like are shown on the left side and a second condenser 120B, a second compressor 110B, A second double tube 140B, and the like are shown.

The first condenser 120A, the first compressor 110A and the first double tube 140A and the second condenser 120B, the second compressor 110B, the second double tube 140B, Since the functions are the same, the symbols of A and B are omitted and the functions are explained together.

The condenser 120 may use R-600a, R-23 Mics or the like as the compressor refrigerant.

The first pipe 171 may be a discharge pipe connected to the condenser 120 and may include a compressor compressor Mafra device for protecting the condenser 120.

Further, the refrigerant is connected to the condenser 120 through the first pipe 171, which is connected to the filter dryer 130 to absorb moisture.

The filter dryer 130 is connected to the double pipe 140. The double pipe 140 may be configured such that the second refrigerant pipe 142 accommodates the first refrigerant pipe 141. [

The first refrigerant pipe 141 may be connected to the expansion pipe 150 in the filter dryer 130 and the second refrigerant pipe 142 may be connected between the evaporator 160 and the compressor 110. That is, the first refrigerant tube 141 is used to cool the refrigerant flowing from the filter dryer 130 to the expansion tube 150, and the second refrigerant tube 142 is used to cool the refrigerant in the first refrigerant tube 141 in advance And the cooled refrigerant can be discharged to the expansion pipe 150. [

The filter dryer 130 may filter the moisture or foreign matter from the refrigerant discharged from the condenser 120 and then provide the refrigerant to the first refrigerant tube 141 of the double tube 140.

In the dual pipe 140, the first refrigerant pipe 141 allows the refrigerant to flow from the filter drier 130 to the expansion pipe 150, and the second refrigerant pipe 142 allows the refrigerant to flow from the evaporator 160 to the compressor (110). That is, the refrigerant flowing in the first refrigerant tube 141 and the refrigerant flowing in the second refrigerant tube 142 are moved in opposite directions, and the refrigerant flowing through the first refrigerant tube 141 and the second refrigerant tube 142 142 can be effectively performed.

The double tube 140 may be disposed on the back surface of the housing 103 and then molded by foamed urethane. The foamed urethane is a resin having an innumerable air layer inside and is applied between the freezing chamber 101 and the main body 103 to insulate the cryogenic freezer 100 according to the embodiment. At this time, the main body 103 and the freezing chamber 101, a double tube 140 having a plane coil shape can be molded.

The dual tube 140 may be formed in a planar coil type to minimize volume and to achieve compactness. The dual tube 140 may have a coil shape from a circumferential surface to a central portion.

When the double tube 140 is placed on the rear surface of the main body 103 and then molded by the foamed urethane, the molded body is molded by the foamed urethane on the back surface of the main body 103, .

The refrigerant discharged from the filter dryer 130 is further cooled by the second refrigerant tube 142 in the first refrigerant tube 141 of the double tube 140 and then supplied to the expander 150. At this time, The refrigerant applied to the heat exchanger 150 may be sufficiently cooled and cooled.

The supercooled refrigerant expands in the expansion pipe 150 to become a low-temperature / low-pressure gaseous refrigerant, and can be lowered to a sufficiently low temperature when entering the freezing room 101.

The evaporator 160 (not shown) absorbs the latent heat of the freezing chamber 101, so that the refrigerant is converted into a gas-liquid state.

In this case, the evaporator 160 (not shown) has a shape of an evaporator tube provided inside the evaporator chamber 101. The volume of the double tube 140 is in a range of 1: 1 or 70% to 130% Lt; / RTI >

In the present invention, the cooling and expansion units 190, 200 and 210 may be additionally provided between the filter dryer 130 and the double pipe 140.

The cooling and expansion parts 190, 200, and 210 are pre-cooled by the double pipe 140 to shorten the expansion time of the evaporator 160.

In addition, the compressor 110 is simultaneously expanded to prevent overheating.

Referring to FIG. 2, the filter dryer 130 may be connected to a high-pressure pipe 172 for dispersing and a solenoid valve 180 for blocking refrigerant.

The solenoid valve 180 passes through the cooling pipe 173 for heat exchange and passes through the high pressure pipe 172 and passes through the condensation high pressure pipe 174 of 6.4 mm.

At this time, the cooling unit 190 may pre-cool the pre-charging process with the double tube 140 to shorten the time required for the evaporator 160 to expand.
That is, the cooling unit 190 is used to cool the refrigerant directed to the double pipe 140, and the time for cooling the refrigerant introduced into the double pipe 140 can be reduced by previously cooling the refrigerant.
In addition, when the condensing high-pressure pipe 174 is placed, the high-pressure condensing pipe 210 having a size of 4 mm x 2 m to 4 m can be applied to further shorten the time required for the expansion in the evaporator 160.

delete

That is, the cooling unit 190 and the condensed high-pressure pipe 174 according to the present invention can be regarded as a capillary tube that serves as an expansion valve in the expansion pipe 150.

Through this, a high pressure pipe 175 of 4 mm condensed and cooled can be applied.

That is, a typical average temperature of entering the inlet of the double tube 140 is 45 ° C, and it can be made 20 ° C or less by using the cooling unit 190, thereby reducing the load of the double tube 140 during operation, It is possible to rapidly lower the temperature within the chamber.

Thereafter, the refrigerant is cooled and condensed in the dual tube 140 and passes through the 4 mm high-pressure pipe 176, and the temperature of the high-pressure pipe 176 becomes -50 ° C to -125 ° C.

Further, a 9.5 mm suction pipe 177 connected to the double pipe through the expansion pipe 150 and the evaporator 160 is applied.

Thereafter, the refrigerant passes through the dual tube 140 and the 9.5 mm tube 178 which cools the condensation tube by suction before entering the compressor 110 again.

At this time, a double cooling pipe 200 having a size of 18 mm × 150 mm to 250 mm is used for performing the process of simultaneously expanding the compressor 110 when the compressor 110 is operated.

That is, the process of expanding at the same time when the compressor 110 is operated can be performed through the double cooling pipe 200 to prevent overheating.

Thereafter, the refrigerant is connected to the compressor 110 along the suction pipe 179 of 9.5 mm after passing through the double cooling pipe 200.

Fig. 3 shows a practical example of the ultra-low temperature freezer shown in Fig. 2, and Figs. 4A and 4B show a specific example of the cooling and expansion parts shown in Fig.

Referring to FIG. 3, there is shown an actual application example of the compressor 110, the condenser 120, the double tube 140, the cooling and expansion parts 190, 200, and 210 applied to the present invention.

Also, referring to Figs. 4A to 4D, a 9.5 mm tube 178 is shown for cooling a condensation tube, which is a 9.5 mm copper tube tube that enters a compressor suction pipe via a dual cooler.

Also shown is a high pressure condensing tube 210, which is a 4 mm tube (i.e., a cooled tube) that passes through a dual tube through a dryer 150 to a dual tube inlet.

Also shown is a cooling section 190, which is an initial cooling tube that expands to a 4 mm tube connected to an expansion tube.

Also, a dual tube 200 is shown in which a double tube tube is used from 28 mm to 40 mm and a tube length is from 150 to 300 mm.

Also shown is a suction pipe 179 of 9.5 mm, which is a compressor compressor suction line heat line,

A high pressure condensing tube 210 which is a high pressure gas pipe between 4 mm and 6 mm going to the double tube 140 through the dryer 150 is shown.

5 shows a specific example of the freezing chamber and the main body of the ultra-low temperature freezer shown in Fig.

6 and 7 show reference views for an example of the double tube shown in Fig.

As described above, the evaporator 160 absorbs the latent heat of the freezing chamber 101, so that the refrigerant is converted into a gas-liquid state. At this time, the evaporator 160 has a shape of an evaporator tube provided inside the evaporator chamber 101, and the volume of the double tube 140 may be 1: 1 or 70% to 130% of the volume of the evaporator tube have.

here,

1) The volume of the evaporator tube refers to the volume calculated based on the inner diameter of the evaporator tube,

2) The volume of the double tube 140 may mean [the volume of the second refrigerant tube 142 - the volume of the first refrigerant tube 141]. Hereinafter, [the volume of the second refrigerant tube 142 - the volume of the first refrigerant tube 141] is defined as "differential volume ".

In this case, the volume of the second refrigerant pipe 142 corresponds to the volume based on the inner diameter of the second refrigerant pipe 142, and the volume of the first refrigerant pipe 141 corresponds to the outer diameter of the first refrigerant pipe 141 It is possible to cope with the reference volume.

Here, the volume of the second refrigerant pipe 142 refers to an internal volume through which the refrigerant can flow in the second refrigerant pipe 142 purely.

The refrigerant discharged from the evaporator to the compressor 110 cools the liquid refrigerant flowing from the filter dryer 130 toward the expansion pipe 150 and flows through the first refrigerant pipe 141, The refrigerant flowing from the filter dryer 130 to the expansion pipe 150 may be cooled in the condenser 120 and then cooled again to be supplied to the expansion pipe 150. The refrigerant vaporized in the expansion pipe 150 is in a low temperature / low pressure state and is supplied to the second refrigerant pipe 142 by absorbing the latent heat of the freezing chamber 101 in the evaporator 160. The refrigerant in the second refrigerant pipe 142 can be returned to the compressor 110 by absorbing the heat of the refrigerant flowing through the first refrigerant pipe 141 by exchanging heat with the first refrigerant pipe 141. Accordingly, in the compressor 110, the refrigerant heated by the first refrigerant tube 141 is rapidly supplied to the condenser 120, and the refrigerant is rapidly compressed to a high temperature / high pressure state. In this way, since the refrigerant returned from the second refrigerant pipe 142 to the compressor 110 is sufficiently heated, efficiency of switching the refrigerant to the high temperature / high pressure state by compressing the refrigerant in the compressor 110 can be improved.

This improvement in efficiency means that the cooling cycle can be completed more quickly and the temperature of the freezing chamber 101 can be lowered further.

At this time, the volume of the second refrigerant pipe 142 may be made equal to the volume of the evaporator tube constituting the evaporator 160 by 1: 1, or the volume thereof may be increased or decreased according to the target temperature.

The volume of the evaporator tube is proportional to the cooling capacity for lowering the temperature of the freezer compartment 101. The volume of the second refrigerant tube 142 is formed in accordance with the cooling capacity of the evaporator tube and the volume of the refrigerant flowing from the node A to the node D It can be seen that the refrigerant flowing in the evaporator tube is heated in the second refrigerant tube 142 of the same volume. Accordingly, the refrigerant flowing from the evaporator to the compressor 110 is sufficiently preheated in the second refrigerant pipe 142 and is applied to the compressor 110. The compressor 110 compresses the preheated refrigerant and supplies it to the condenser 120 can do. This preheating cycle is performed every time the cooling cycle for the compressor 110, the condenser 120, the filter dryer 130, the double tube 140, the expansion tube 150, and the evaporator 160 is repeated, Can be accumulated to improve the efficiency of the cooling cycle.

That is, the freezing chamber 101 can be quickly cooled to a very low temperature within a short time.

On the other hand, when the evaporator tube and the second refrigerant tube 142 (or the first refrigerant tube 141) according to the above-mentioned volume ratio have a similar volume, the temperature of the refrigerant flowing into the expansion tube 150 becomes lower than the first refrigerant The temperature of the refrigerant which is expanded by the pipe 141 and is expanded in the expansion pipe 150 while the temperature of the refrigerant flowing from the evaporator to the compressor 110 is reduced through the second refrigerant pipe 142, The expansion temperature difference DELTA T, which is defined by the temperature difference of the outside temperature of the outdoor unit, decreases.

The reduction of the expansion temperature difference DELTA T prevents the temperature of the refrigerant flowing through the evaporation pipe from being lowered to -100 DEG C or lower and the temperature of the refrigerant to be -70 DEG C to -80 DEG C. That is, the ultra-low temperature freezer according to the embodiment allows rapid reaching of a constant temperature range (-70 ° C to -80 ° C), and can be achieved in a predetermined temperature range (-70 ° C to -80 ° C Lt; 0 > C). The medical freezer according to the embodiment allows cells, DNA, blood, and other materials requiring experimentation or preservation to be stored at a rapid and constant temperature range.

Referring to FIG. 6, in the double tube 140 according to the embodiment, one side of the second refrigerant tube 142 in which the first refrigerant tube 141 is inserted is concentric with the center toward the center, It can be seen that it has a flat coil shape.

This structure prevents the thickness of the main body 103 from being increased by allowing the double tube 140 according to the embodiment to be attached to the back surface of the main body 103 in the form of a flat coil when the double tube 140 according to the embodiment is disposed on the back surface of the main body 103 . That is, the ultra-low temperature freezer according to the embodiment can be implemented more compactly and slimly. One side of the double tube 140 shown in FIG. 6 is connected to the filter dryer 130, and the other side can be connected to the expansion pipe 150 by protruding in the direction of D4 from the center.

In Fig. 7, the double tube 140 is brought into close contact with the back surface of the body 103-1 so that an externally planar concentric structure can be exposed.

In this state, if the body 103 is covered with the body 103 and the foamed urethane resin is applied between the body 103 and the body 103-1, it can be molded.

Figure 8 shows a reference diagram of a method for determining the volume of a double tube in accordance with an embodiment of the present invention.

Referring to FIG. 8, the double tube 140 according to the embodiment calculates the volume of the first refrigerant tube 141 based on the outer diameter D2 of the first refrigerant tube 141, and the volume of the second refrigerant tube 142 , The volume of the second refrigerant tube 142 is calculated on the basis of the inner diameter D2 and the volume difference which is the difference between the volume of the first refrigerant tube 141 and the volume of the second refrigerant tube 142, Can be calculated as the volume of the refrigerant flowing through the refrigerant pipe (142).

The volume of the circular pipe shape can be calculated according to Equation (1) below, and the volume of the first refrigerant tube 141 and the volume and volume difference of the second refrigerant tube 142 are calculated based on this.

는 원주율을 나타내고, r은 원통의 반지름이며, h는 원통의 길이를 나타낸다.Where v is the volume of the cylinder,

R represents the radius of the cylinder, and h represents the length of the cylinder.

The volume of the first refrigerant pipe 141 is calculated by referring to Equation (1).

는 원주율을 나타내고, D1은 제1냉매 관(141)의 반지름이며, H는 제1냉매 관(141)의 길이를 나타낸다.Here, v1 is the volume of the first refrigerant tube 141,

D1 is the radius of the first refrigerant tube 141 and H is the length of the first refrigerant tube 141. [

Next, the volume of the second refrigerant pipe 142 is calculated with reference to Equation (1).

는 원주율을 나타내고, D2는 제2냉매 관의 반지름을 나타내며, H는 제2냉매 관(142)의 길이를 나타낸다. 이때, D2는 제2냉매 관(142)의 내경 반지름을 의미할 수 있으며, 이는 제2냉매 관(142)의 내부 체적과 제1냉매 관(141)의 외부 체적의 체적 차를 산출하여, 제2냉매 관(142)의 순수 체적을 산출하는데 이용되는데 따른다.Where v2 is the volume of the second refrigerant tube 142,

D2 represents the radius of the second refrigerant tube, and H represents the length of the second refrigerant tube 142. [ In this case, D2 may mean the inner radius of the second refrigerant pipe 142, which calculates the volume difference between the inner volume of the second refrigerant pipe 142 and the outer volume of the first refrigerant pipe 141, 2 < / RTI > refrigerant tube < RTI ID = 0.0 > 142 < / RTI >

The volume of the car can be calculated as V2 - V1. The length can be adjusted so that the calculated volume of the main body according to Equations (1) to (3) is 70% to 130% of the volume of the evaporator tube. When the volume of the refrigerant is equal to the volume of the evaporator tube, the refrigerant flowing through the evaporator tube can be sufficiently preheated. If the volume of the refrigerant is 100% or more of the evaporator tube volume, further preheating may be possible.

If the refrigerating temperature of the ultra low temperature freezer according to the embodiment does not need to be lowered to -80 ° C or lower, the difference volume of the evaporator tube volume may be 70% to 100%. On the contrary, And may be from 101% to 130% when it is necessary to cool to a temperature of 80 degrees or less. That is, the ratio of the volume to the volume of the evaporation tube can be determined according to how much the temperature of the freezing chamber 101 is reduced by the ultra-low temperature freezer according to the embodiment.

If the length of the evaporator and the length of the second refrigerant tube 142 are the same, this means that the volume of the evaporator tube and the volume of the second refrigerant tube 142 and the first refrigerant tube 141 are the same . In this case, the length of the second refrigerant pipe 142 in the ultra-low temperature freezer 100 according to the embodiment may be 130% of 70% of the length of the evaporator.

9 shows a concrete embodiment of the condenser 120 shown in FIG.

Referring to FIG. 9, the condenser 120 can discharge bad air to the outside through the upper fan cover.

That is, the refrigeration condenser and the fan cover may be combined.

The previous cycle, which is applied according to the conventional apparatus, takes 2 hours and 30 minutes at a cryogenic temperature of -80 ° C using a double tube. However, when the apparatus proposed by the present invention is applied, energy saving and rapid temperature drop can be induced .

In addition, when the apparatus of the present invention is applied, the compressor operates at almost the same speed as that of the compressor of the present invention. .

For example, the effect of the present invention can be confirmed because the temperature of 50 ° C is lowered by only 20 millimeters, -70 ° C is 1 hour, and -80 ° C is 2 hours.

As a result, the effect can be improved by 150% when the overheat or the current of the compressor 110 is operated differently than usual.

This is a process in which the compressor 100 simultaneously expands when the compressor 100 is operated. Since the compressor is precooled by the proposed device, the temperature of the double pipe 140 is cooled to a higher level before it enters the double pipe 140, By cooling and condensing, the expansion temperature is reduced to a very low temperature, and the temperature falls quickly within a short time.

When each point is observed during the operation of the laboratory cryogenic freezer, it can be seen that the descending speed is -70 ° C is the falling speed in one hour and -80 ° C is one hour in the time of the operation, .

It is to be understood that the above-described embodiments of the present invention are not limited to the above-described embodiments, and the present invention may be embodied with various other modifications and alternative embodiments. have.

Claims (5)

A compressor 110 for compressing the refrigerant to increase the pressure;
A condenser 120 for cooling the refrigerant to take heat and change the condensation;
A dual pipe 140 for lowering the temperature of the refrigerant;
An expansion pipe (150) for reducing the pressure of the refrigerant; And
And an evaporator (160) having an evaporating pipe for refrigerating by introducing the reduced-pressure refrigerant to perform heat exchange,

The dual tube (140)
A first refrigerant pipe (141) connected between the condenser and the expansion pipe; And
And a second refrigerant pipe (142) accommodating the first refrigerant pipe (141) therein to form a double pipe and connected between the evaporator (160) and the compressor (110)

Between the condenser 120 and the double tube 140,
And a cooling unit (190) for performing a pre-cooling process before the refrigerant is introduced into the dual pipe (140) to shorten the operating time of the evaporator (160)

Between the double tube 140 and the compressor 110,
The refrigerant flowing into the double tube 140 through the evaporator 160 and discharged is precooled before being introduced into the compressor 110 to prevent the compressor 110 from overheating. (200)

Between the first refrigerant tube 141 and the condenser 120,
And a filter dryer 130 for removing moisture and foreign matter from the refrigerant discharged from the condenser 120,

Between the filter dryer 130 and the double tube 140,
And a condensing pipe (210) for performing a pre-cooling process before the refrigerant is introduced into the double pipe (140) to shorten the operating time of the evaporator (160)

Wherein the volume of the second refrigerant tube (142) and the volume of the first refrigerant tube (141), which is the volume of the evaporation tube, is 70% to 130%
The above-
The first volume and the outer diameter calculated for the first refrigerant tube (141) with respect to the inner diameter are calculated from the second volume with respect to the second refrigerant tube (142) Is a volume obtained by subtracting,

The second refrigerant pipe (142)
The volume of the evaporator is the same as the length of the evaporator tube, the volume of the evaporator is the same as the inner diameter of the evaporator tube,

The first refrigerant pipe (141) and the second refrigerant pipe (142) are arranged such that the moving directions of the refrigerant are opposite to each other,

The above-
Is the value obtained by subtracting v1 of the following formula (B) from v2 of the following formula (A).

Equation A

In Equation A, v1 is the volume of the first refrigerant tube 141,

D1 is the radius of the first refrigerant tube 141 and H is the length of the first refrigerant tube 141. [

Equation B

In Equation B, v2 is the volume of the second refrigerant tube 142,

D2 represents the radius of the second refrigerant tube 142, and H represents the length of the second refrigerant tube 142. [ delete delete delete delete

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