KR101438155B1

KR101438155B1 - Ultra low temperature freezer

Info

Publication number: KR101438155B1
Application number: KR1020140060685A
Authority: KR
Inventors: 윤근진
Original assignee: 주식회사 지엠에스
Priority date: 2014-05-21
Filing date: 2014-05-21
Publication date: 2014-09-05
Also published as: CN106461286A; WO2015178659A1

Abstract

Disclosed is an ultra low temperature freezer in which a double pipe is formed so that a volume of the double pipe performing heat exchange between a refrigerant discharged from a condenser and a refrigerant discharged from an evaporator is 70% to 130% relative to that of an evaporation pipe, thereby lowering the temperature of the refrigerant by ultra low temperature as a cooling cycle of the refrigerant is repeated. In the ultra low temperature freezer including an evaporator having an evaporation pipe, a compressor, an expansion pipe, and a condenser, a first refrigerant pipe is provided between the condenser and the expansion pipe, and is connected between the condenser and the expansion pipe, and a second refrigerant pipe is connected between the evaporator and the compressor, and receives the first refrigerant pipe therein to form the double pipe. A volume difference between the volume of the second refrigerant pipe and the volume of the first refrigerant pipe is 70% to 130% relative to that of that evaporation pipe. The volume difference is a volume obtained by subtracting the first volume from the second volume, in which the first volume is calculated from the first refrigerant pipe on the basis of the inner diameter, and the second volume is calculated from the second refrigerant pipe on the basis of the outer diameter.

Description

Ultra low temperature freezer [0002]

The present invention relates to an ultra-low temperature freezer, and more particularly, to a refrigerator having a conventional structure by controlling the volume of a double tube without using a separate refrigerant such as a cryogenic refrigerant, To a refrigerator as far as possible.

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.

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.

In order to achieve the above object, an ultra low temperature freezer according to an embodiment of the present invention may include an evaporator, a compressor, an expansion tube, a condenser, and a double tube in which an evaporation tube is housed. At this time, the double pipe is provided between the condenser and the expansion pipe, and the first refrigerant pipe connected between the condenser and the expansion pipe and the first refrigerant pipe are accommodated therein to form a double pipe, 2 refrigerant tube, and the volume of the refrigerant, which is the difference between the volume of the second refrigerant tube and the volume of the first refrigerant tube, is 70% to 130% with respect to the volume of the evaporation tube.

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

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.
Figs. 3 and 4 show reference views for an example of the double tube shown in Fig.
Figures 5 and 6 show reference drawings for a structure in which a double tube and a double tube disposed between the body and the body are molded.
Figure 7 shows a reference drawing for a method of determining the volume of a double tube according to an embodiment.
8 is a view for explaining the refrigeration cycle of the ultra low temperature freezer according to another embodiment of the present invention.

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.

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. Here, the double pipe 140 may be configured such that the second refrigerant pipe 142 receives 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 130. [

The filter dryer 130 may provide the refrigerant to the first refrigerant pipe 141 of the double pipe 140 after filtering the moisture or foreign matter from the refrigerant discharged from the condenser 120.

In the dual pipe 140, the first refrigerant pipe 141 allows the refrigerant to flow from the filter dryer 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 double tube 140 may have a coil shape from the peripheral surface toward the center. 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, . This will be described later.

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, 150 may be sufficiently cooled and cooled. And the cooled 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 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 ".

At this time, the volume of the second refrigerant tube 142 corresponds to the volume based on the inner diameter of the second refrigerant tube 142,

The volume of the first refrigerant tube 141 may correspond to the volume of the first refrigerant tube 141 based on the outer diameter of the first refrigerant tube 141.

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. The 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 by repeating the preheating of the refrigerant every time the cooling cycle for the compressor 110, the condenser 120, the filter dryer 130, the double tube 140, the inflator 150 and the evaporator 160 is repeated. The efficiency of the cooling cycle can be increased.

That is, the freezing chamber 101 can be quickly cooled to a very low temperature within a short time. For example, when the diameter of the evaporator tube constituting the evaporator 160 is 7 mm, the first refrigerant tube 141 constituting the double tube 140 has an outer diameter of 4 mm and an inner diameter of the second refrigerant tube 142 is 8 mm (Outer diameter is 9 mm), the volume of the evaporator tube can be calculated as (radius) ² x Π xh (length) and can be calculated as "12.25Π xh".

At this time, the volume of the first refrigerant tube 141 is "4Π xh" and the volume of the second refrigerant tube 142 is calculated as "16Π xh". The volume of the second refrigerant tube 142 is "16Π xh" - "4Π xh" Quot; 12 " xh ". If the length of the evaporator tube is equal to the length of the second refrigerant tube 142, the volume ratio of the second refrigerant tube 142 (or the first refrigerant tube 141)

12 / 12.5 = 96%.

On the other hand, when the evaporation pipe 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 pipe 150 is raised by the first refrigerant pipe 141 and the temperature of the refrigerant flowing from the evaporator pipe to the compressor 110 through the second refrigerant pipe 142 decreases, The expansion temperature difference DELTA T defined by the temperature of the refrigerant expanded in the pipe 150 and the temperature difference between the outside temperature of the refrigerating chamber 101 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.

FIGS. 3 and 4 show reference views for an example of the double tube 140 shown in FIG. 3 and 4 will be referred to together with Fig.

Referring to FIG. 3, in the double pipe 140 according to the embodiment, one surface of the second refrigerant pipe 142 in which the first refrigerant pipe 141 is inserted is formed in a concentric shape from the peripheral surface 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 pipe 140 shown in FIG. 3 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. 4, the double tube 140 is brought into close contact with the back surface of the body 103-1 so that a planar concentric structure can be exposed externally. 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. This will be described with reference to FIG. 5 and FIG. 6 together.

5 shows an example in which the double tube 140 is disposed in the body 103-1 and the double tube 140 is disposed in parallel with the exposed surface of the body 103-1, -1) without increasing the thickness of the substrate. 6 is a reference view showing the arrangement relationship between the body 103-1 in which the double tube 140 is disposed and the body 103. As shown in Fig. 6, the double tube 140 has a body 103 -1, the region S1 between the body 103-1 and the body 103 can be filled with a heat insulating material such as foamed urethane. In the present embodiment, the foamed urethane is referred to as a heat insulating material for filling the region S1, but in addition, the region S1 may be filled with a heat insulating material such as foamed styrofoam, foam rubber and various other materials.

When the foamed urethane is filled in the region S1, the double tube 140 disposed in the body 103-1 can be molded together with the body 103 by the foamed urethane. Accordingly, heat exchange between the first refrigerant tube 141 and the second refrigerant tube 142 can be performed without being affected by the external temperature of the double tube 140.

FIG. 7 shows a reference diagram of a method for determining the volume of a double tube 140 according to an embodiment.

Referring to FIG. 7, 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.

Where v is the volume of the cylinder, Π is the circumferential rate, r is the radius of the cylinder, and h is the length of the cylinder.

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

Here, v1 is the volume of the first refrigerant tube 141, Π is the circumferential rate, 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).

Here, v2 is the volume of the second refrigerant tube 142, Π is the circumferential rate, D2 is the radius of the second refrigerant tube, and H is 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.

8 is a view for explaining the refrigeration cycle of the ultra low temperature freezer according to another embodiment of the present invention.

Referring to FIG. 8, the refrigeration cycle of the ultra-low temperature freezer according to the embodiment has a refrigeration cycle of compression-condensation-expansion-evaporation, as described with reference to FIG. 2, A freezer, a compressor 110, a condenser 120, a filter dryer 130, a double tube 140, an expansion tube 150, and an evaporator 160.

Accordingly, the compressor 110, the condenser 120, the filter drier 130, and the expansion tube 150, which are overlapped with those of FIG. 2, will not be described and shown in the drawings. To be applied mutatis mutandis.

The present embodiment is characterized in that the volume of the evaporator tube constituting the evaporator 160 is not the volume of the evaporator tube but the volume of the second refrigerant tube 142, So that the refrigerant moving in the compressor 100 absorbs heat and is then supplied to the compressor 100. When the refrigerant is compressed in the compressor 100 by switching the state of the refrigerant to the high temperature / high pressure state in a short time, the refrigerant can be supplied to the condenser 120 by being heated and transferred to the compressor 100, The refrigerant is heated in the second refrigerant pipe 142 and the refrigerant is supercooled in the first refrigerant pipe 141 by being cooled in the first refrigerant pipe 141 when the refrigerant passes through the first expansion pipe 120 and the expansion pipe 150 . When the heating and the cooling of the refrigerant are repeated, the ultra-low temperature freezer according to the embodiment can lower the temperature of the freezing room 101 to -80 degrees or less in a short time. Here, the heating and cooling of the refrigerant are not limited to those shown in Fig. 8, but can be applied to the entire embodiment.

The second movement time t2 of the refrigerant moving through the second refrigerant pipe 142 may be 70% to 130% of the first movement time t1 of the refrigerant moving in the evaporator, The second movement time t2 to the first movement time t1 may increase from 70% to 130% or more.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate description of the present invention and to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

100: Ultra-low temperature freezer 101: Freezer
110: compressor 120: condenser
130: Filter dryer 140: Double tube
141: first refrigerant tube 142: second refrigerant tube
150: inflator 160: evaporator (evaporator)

Claims

1. An ultra-low temperature freezer comprising an evaporator having an evaporator tube, a compressor, an expansion tube and a condenser,
A first refrigerant pipe provided between the condenser and the expansion pipe, the first refrigerant pipe being connected between the condenser and the expansion pipe; And
And a second refrigerant pipe connected to the evaporator and the compressor, the second refrigerant pipe housing the first refrigerant pipe to form a double pipe,
Wherein the volume of the first refrigerant tube is set to be 70% to 130% of the volume of the second refrigerant tube and the volume of the first refrigerant tube,
A first volume calculated for the first refrigerant tube based on an inner diameter and
Is a volume obtained by subtracting the first volume from the second volume with respect to a second volume calculated with respect to the second refrigerant tube based on the outer diameter.

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The method according to claim 1,
The first refrigerant pipe and the second refrigerant pipe are connected to each other through a pipe,
And the directions of movement of the refrigerant are opposite to each other.

The method according to claim 1,
A condenser disposed between the first refrigerant pipe and the condenser,
Further comprising a filter drier for removing moisture and foreign substances from the refrigerant discharged from the condenser.

The method according to claim 1,
The second refrigerant pipe may include:
Wherein the coil is formed in the shape of a flat coil extending from the circumferential surface toward the center, and the center portion is protruded and connected to the expansion tube.

The method according to claim 1,
The second refrigerant pipe may include:
Wherein the evaporator has the same length as the evaporator tube, wherein the volume of the evaporator is the same as the inner volume of the evaporator tube.

The method according to claim 1,
The second refrigerant pipe may include:
Characterized in that it is molded by foamed urethane.

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