JP2005249342A - Storage box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heat transfer efficiency in both cooling and heating operation. <P>SOLUTION: A brine tube 22, in which brine as secondary refrigerant is distributed, is fixed to the reverse face of an inner box 12 as a box inner wall via a bracket 30. The bracket 30 is formed in a channel shape by a thick aluminum plate having high heat conductivity. The bracket 30 is applied on the brine tube 22 and both mounting plates 33 are pasted to the reverse face of the inner box 12 with an aluminum foil tape 35. The brine tube 22 is fixed to the reverse face of the inner box 12 in the state of being pushed thereagainst with a ceiling plate 31 of the bracket 30. A defrosting cord heater 40 is wired along the piping line of the brine tube 22, applied to a flat mounting surface 34 of the ceiling plate 31 of the bracket 30, and pasted thereto with another aluminum foil tape 42. The cold of the brine as well as the heat of the cord heater 40 are efficiently transmitted to the inner box 12 via the bracket 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a storage cabinet that cools the inside of a warehouse by circulating a refrigerant through a refrigerant pipe piped along the inside wall of the warehouse.

For example, a constant-temperature high-humidity store is one that cools while keeping the inside of the store at a high humidity so that the freshness of fresh food can be maintained over a long period of time. The inside of the cabinet is indirectly cooled through the cooling of the inner box by circulating the circulation of the brine which is piped in a shape and cooled by the refrigeration apparatus to the brine pipe.
Here, conventionally, as a means for fixing the brine pipe to the back surface of the inner box, as shown in FIG. 16, a method of applying the aluminum foil tape 3 with the brine pipe 1 applied to the back surface of the inner box 2 has been adopted. (For example, refer to Patent Document 1).
JP 2002-267340 A

  In the case of the above structure, the transmission path of the cold heat from the brine pipe 1 to the inner box 2 is the direct contact portion 4 between the brine pipe 1 and the inner box 2 and the path 5 through the aluminum foil tape 3, Since the thickness of the aluminum foil tape 3 is only about 0.1 mm, the heat transfer amount in the heat transfer path 5 by the aluminum foil tape 3 is greatly inferior to that of the direct contact portion 4. Therefore, heat exchange between the internal wall surface (inner box 2) and the internal space is equivalent to being performed only by the direct contact portion 4 of the brine pipe 1, and the cooling efficiency is not good. In addition, when the cooling operation continues, frost / ice 6 grows on the surface of the direct contact portion 4 and the cooling efficiency further deteriorates. Further, as described above, when a temperature difference is generated on the inner wall surface, dew condensation is likely to occur at a low temperature portion, and as a result, the humidity inside the warehouse may be lowered.

On the other hand, when frost is generated on the inner wall surface, the dehumidifying operation is appropriately performed in order to reduce the humidity inside the warehouse and hinder the original function of the high humidity warehouse. Then, the brine was heated by the heating device, and the brine that had reached a high temperature was defrosted by circulating it through the brine pipe 1. However, in the conventional method, since the temperature gradually decreases while the brine flows through the brine pipe 1 along the inner box 2, there is a problem that the defrosting speed is slow particularly at a position corresponding to the downstream side.
The present invention has been completed based on the above circumstances, and an object thereof is to increase the heat transfer efficiency in both cooling and heating.

As a means for achieving the above object, the invention of claim 1 is characterized in that a storage body is formed by a heat insulating box body in which a heat insulating material is filled between an inner box and an outer box, and heat insulation of the inner box is performed. In a storage cabinet in which a refrigerant pipe is piped along the surface facing the material and the refrigerant is circulated through the refrigerant pipe to cool the inside of the warehouse, the refrigerant pipe has a thermally conductive bracket. This bracket has a feature in that the bracket is fixed to a surface of the inner box facing the heat insulating material, and a heating means for defrosting is provided in contact with the outer surface of the bracket. .
The invention of claim 2 is characterized in that, in the invention of claim 1, a flat surface extending over a predetermined width is formed on the outer surface of the bracket, and this flat surface serves as a mounting surface of the heating means. .

<Invention of Claim 1>
The cooling heat transfer path from the refrigerant pipe to the inner box is added to the part where the refrigerant pipe is in direct contact with the inner box, and a path through the bracket is added. Compared with the case of using a foil tape, the cross-sectional area perpendicular to the heat transfer direction increases, which greatly increases. In addition, heat exchange with the inner wall surface can be performed uniformly over the entire surface, so that the cooling efficiency can be greatly improved. In addition, since the temperature difference on the inner wall surface is suppressed to be small, it is difficult for condensation to occur, and it is possible to prevent a decrease in humidity in the chamber.
Further, the heat of the heating means is transmitted over the entire surface of the inner box through the bracket, and can be efficiently heated. It is possible to perform defrosting of the inner wall surface uniformly and at high speed over the entire surface.

<Invention of Claim 2>
Since a flat mounting surface is provided on the outer surface of the bracket, it is possible to stably apply the heating means to the mounting surface, and therefore it is possible to easily and efficiently perform subsequent mounting operations such as tape application. it can.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In the first embodiment, a constant temperature and high humidity storage is illustrated. In FIG. 1, reference numeral 10 denotes a main body of a constant temperature and high humidity chamber, and as shown in FIG. 6, a heat insulating material 13 such as foamed resin is filled between an outer box 11 and an inner box 12. It is formed of a heat insulating box that is open to the front. The inside of the main body 10 is a storage chamber 14, and a heat insulating door (not shown) is provided on the front surface of the storage chamber 14 so as to be opened and closed. The inside of the storage chamber 14 is basically secondary-cooled via the cold heat of the brine B primarily cooled by the refrigeration apparatus 15.
The refrigeration apparatus 15 constitutes a known refrigeration cycle by circulatingly connecting a compressor 16, a condenser 17, an expansion valve 18 and an evaporator 19 through a primary refrigerant pipe.

As a means for supplying the brine B, a tank 20 capable of storing the brine B is provided, and an evaporator 19 of the refrigeration apparatus 15 is provided in the immersion state.
On the other hand, the brine pipe 22 is formed of, for example, a copper pipe having a high thermal conductivity, and is piped along the wall surface of the storage chamber 14. Specifically, as shown in FIG. 2, the brine pipe 22 is applied to the back surface (outer surface) of the inner box 12 constituting the wall surface of the storage chamber 14, and is introduced from one side of the upper position on the back surface of the inner box 12, for example. After that, it is arranged in a meandering manner over the four surfaces of the rear surface, the right side as viewed from the front, the upper surface, and the left side, and the other side of the rear surface is led out from the upper position.
An inlet 23 </ b> I of the introduction path 23 and an outlet 24 </ b> E of the outlet path 24 of the brine pipe 22 are respectively connected to the inlet / outlet of the tank 20, and a pump 25 is interposed in the middle of the introduction path 23.

  The brine tube 22 is fixed to the back surface of the inner box 12 via the bracket 30. The bracket 30 is made of a metal having a high thermal conductivity, such as aluminum or stainless steel, and is formed of a thick plate having a thickness of about 1 mm. As shown in FIG. 4, the bracket 30 is formed in a channel shape, and side plates 32 are provided on both sides of a flat ceiling plate 31, and a mounting plate 33 that is bent outward at a right angle is formed on the lower edge of the side plates 32. Has been. A height dimension H to the inner surface of the ceiling plate 31 in the bracket 30 is set to be equal to or slightly smaller than the outer diameter dimension φ of the brine pipe 22. Note that the interval between the opposing surfaces of the side plates 32 is larger than the outer diameter dimension φ of the brine tube 22.

  The bracket 30 is placed on the straight portion 22A of the brine pipe 22 piped on each surface of the inner box 12 as shown in FIG. 2, and both mounting plates 33 are placed on the back surface of the inner box 12 as shown in FIG. The two mounting plates 33 are applied by the aluminum foil tape 35. Thereby, the brine pipe 22 is fixed in a state of being pressed against the back surface of the inner box 12 by the ceiling plate 31 of the bracket 30. Note that the curved portion 22B of the brine tube 22 may be bare or may be stopped by applying an aluminum foil tape.

Moreover, the code heater 40 is provided as a heating means for defrosting, for example. The cord heater 40 is wired for each of the four surfaces of the inner box 12 to which the above-described brine pipe 22 is piped. Specifically, as shown in part in the chain line in FIG. 2, the code heater 40 is arranged in a meandering manner following the piping of the brine pipe 22, and the portion covered with the straight portion 22 </ b> A of the brine pipe 22, that is, the bracket 30. Then, as shown in FIG. 4, it is applied to a mounting surface 34 that is a flat outer surface of the ceiling plate 31 of the bracket 30, and is attached by another aluminum foil tape 42. In addition, in the curved portion 22B of the brine tube 22, as shown in FIG. 5, it is directly applied to the outer surface of the brine tube 22, and appropriate portions are attached with an aluminum foil tape.
The brine tube 22 and the cord heater 40 described above are embedded in the heat insulating material 13 as the heat insulating box (main body 10) is formed (FIG. 6).

As a structure for performing the defrosting operation, as shown in FIG. 1, the suction side of the pump 25 in the introduction path 23 of the brine pipe 22 and the outlet path 24 are connected to bypass the tank 20. A bypass pipe 26 is provided, and a three-way valve 27 is provided at a connection portion between the bypass pipe 26 and the introduction path 23, and the suction side of the pump 25 is connected to the tank 20 side (a side) or bypass. It can be switched and connected to the pipe line 26 side (b side). A check valve 28 is provided on the downstream side of the connecting portion of the outlet passage 24 with the bypass conduit 26.
When the above-described three-way valve 27 is switched to the a side, a cooling circulation path passing through the tank 20 is formed as shown by the solid line arrow in FIG. 1, while when the three-way valve 27 is switched to the b side. As shown by the broken arrows in the figure, a defrosting circulation path that bypasses the tank 20 and passes through the bypass conduit 26 is formed.

Then, the effect | action of this embodiment is demonstrated.
When the cooling operation is performed, the three-way valve 27 is switched to the a side, that is, the tank 20 side, and a cooling circulation path passing through the tank 20 is formed. Then, the brine B primarily cooled in the tank 20 is circulated by the pump 25 to the cooling circulation path (solid arrow in FIG. 1), and is piped along the wall surface of the storage chamber 14, that is, the back surface of the inner box 12. The storage tube 14 is secondarily cooled by the cold heat.
During this cooling operation, the compressor 16 is turned on and off based on the detected temperature of the brine B in the tank 20, so that the cooling temperature of the brine B in the tank 20 is kept almost constant, and the detected temperature in the warehouse Based on the above, the pump 25 is turned on and off, and the inside of the refrigerator is maintained at the set temperature.

  Here, as shown in FIG. 4, the transmission path of the cold heat from the brine pipe 22 to the inner box 12 is a bracket 37 as shown by an arrow in the figure at a portion 37 where the brine pipe 22 is in direct contact with the inner box 12. 30 is added, and the amount of heat transfer in the heat transfer path 38 via the bracket 30 is larger than that in the case of using the aluminum foil tape in the case where the brine pipe is conventionally stopped with the aluminum foil tape. The cross-sectional area perpendicular to the direction increases greatly. Further, when the mounting plate 33 having a relatively large area in the bracket 30 is applied to the inner box 12, the position where the heat exchange is performed is set to each wall surface of the storage chamber 14 when combined with the portion 37 with which the brine pipe 22 is in direct contact. It is set densely over the entire surface. As a result, the cooling efficiency is greatly improved. Moreover, since the temperature difference for each place on the wall surface of the storage chamber 14 is also reduced, condensation is unlikely to occur, and a decrease in humidity in the storage chamber 14 is also prevented.

When a defrosting operation command is issued, the three-way valve 27 is switched to the b side, that is, the bypass line 26 side, and a defrosting circulation path passing through the bypass line 26 is formed, and the code heater 40 is energized. It generates heat.
From this state, the pump 25 is continuously operated, and the brine B is circulated and driven through the defrosting circulation path in the direction indicated by the broken arrow in FIG. 1. The brine pipe 22 piped on the wall surface, that is, the back surface of the inner box 12 is heated directly by the straight portion 22A via the bracket 30 and by the curved portion 22B. The brine B, which is gradually heated and heated up, circulates on the back surface of the inner box 12. At the same time, the heat of the cord heater 40 is transmitted to the inner box 12 through the bracket 30, so that the inner box 12 is efficiently heated over the entire surface. As a result, defrosting of the wall surface in the storage chamber 14 is performed on the entire surface. Over a uniform and high speed.

During the defrosting operation, a wall surface temperature sensor (not shown) detects the temperature of the wall surface of the storage chamber 14, and when the detected temperature reaches a predetermined temperature, frosting on the wall surface is eliminated. Defrosting is considered complete. Then, the code heater 40 is turned off, and the three-way valve 27 is switched to the a side, that is, the tank 20 side to restart the cooling operation, and a cooling circulation path passing through the tank 20 is formed.
At the start of the cooling operation, the brine B that has been heated for defrosting until now flows into the tank 20 and the temperature of the brine B in the tank 20 temporarily rises, but the circulation of the brine B proceeds. To a predetermined cooling temperature. Thereafter, the cooling operation proceeds as described above.

As described above, according to the present embodiment, the brine bracket 22 is fixed to the brine tube 22 by covering the brine tube 22 with the thick bracket 30 made of a material having excellent thermal conductivity at the portion where the brine tube 22 is fixed to the back surface of the inner box 12. Therefore, a heat transfer path with a large heat transfer amount is ensured over the entire surface between the brine pipe 22 and the inner box 12, and the cooling efficiency is greatly improved. Moreover, since the temperature difference of the inner wall surface is suppressed to be small, it is difficult for condensation to occur, and it is possible to prevent a decrease in the humidity in the warehouse, and this type of constant temperature and high humidity chamber is more useful.
Further, in the portion where the bracket 30 is fixed to the inner box 12, the structure is affixed such that the mounting plate 33 provided on the bracket 30 and the back surface of the inner box 12 are attached to each other.

Further, since the cord heater 40 as a heating means for defrosting is arranged in contact with the bracket 30 used for fixing the brine pipe 22, the amount of heat transfer between the cord heater 40 and the inner box 12 is also the same. A large heat transfer path is secured, and the entire surface of the inner box 12 can be efficiently heated. As a result, the defrosting of the wall surface in the storage chamber 14 can be performed uniformly and at high speed over the entire surface.
For the portion where the cord heater 40 is fixed to the bracket 30, the bracket 30 is a channel type, and the mounting surface 34 of the flat cord heater 40 is provided on the outer surface of the ceiling plate 31. Therefore, it is possible to apply it stably, and therefore, it is possible to easily and efficiently perform subsequent attachment work such as application of the aluminum foil tape 42.

<Embodiment 2>
FIG. 7 shows Embodiment 2 of the present invention. In the second embodiment, the shape of the bracket is changed.
The bracket 50 of the second embodiment is the same as that of a so-called channel type made of a thick plate made of aluminum, but the ceiling plate 51 is half on the outer side (upper side in the figure) of the brine pipe 22. Are formed into a semicircular cross section having a half radius of the outer diameter φ of the brine pipe 22.
About another structure, it is the same as that of the said Embodiment 1, Comprising: About the site | part which has the same function, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The bracket 50 is covered with the straight portion 22A of the brine pipe 22, and both mounting plates 33 are applied to the back surface of the inner box 12 and attached with the aluminum foil tape 35. The semicircular ceiling plate 51 of the bracket 50 is It is in close contact with the outer peripheral surface of the semicircular portion outside the brine tube 22. A large contact area between the brine pipe 22 and the bracket 50 allows for excellent heat transfer performance between the two.

<Embodiment 3>
8 and 9 show Embodiment 3 of the present invention. In the third embodiment, the sectional shape of the brine pipe is changed.
That is, as shown in FIG. 8 (A), a brine tube 60A in a round tube state is placed in the forming groove 67 of the lower die 66, and then pressed by the upper die 65 as shown in FIG. 8 (B). As a result, a brine pipe 60 having a plane portion 61 having a predetermined width and having a substantially rice ball-shaped cross section is formed.
As shown in FIG. 9, when the brine pipe 60 is brought into contact with the back surface of the inner box 12, the flat portion 61 having a predetermined width comes into close contact. That is, since the contact area between the brine pipe 60 and the inner box 12 is large, the heat transfer performance between them is excellent.

<Related technology 1>
FIG. 10 shows Related Technique 1. The related technique 1 aims to improve the adhesion when the brine pipe 22 is piped against the back surface of the inner box 12.
As shown in FIG. 2A, the thermal adhesive tape 70 is attached along the piping path of the brine pipe 22 on the back surface of the inner box 12, and the brine pipe 22 is attached thereto. After that, when an outer box (not shown) is fitted to the outside of the inner box 12 and foamed resin 13 (heat insulating material) is foam-filled between the two boxes to produce a heat insulating box, the same figure (B). As shown in FIG. 3, the heat bonding tape 70 is appropriately melted by the heat of the foamed resin 13, and the brine tube 22 is bonded in a state of being in close contact with the back surface of the inner box 12. Thereby, the heat transfer function between the brine pipe 22 and the inner box 12 is improved.

<Related technology 2>
11 and 12 show the related technique 2.
In the related technique 2, the brine pipe 22 is fixed in a meandering manner to a panel 72 having excellent thermal conductivity, and the panel 72 is fixed to each surface of the inner box 12. The panel 72 has an outer dimension that is slightly smaller than each surface of the inner box 12 and is disposed along the piping portion of the straight portion 22A of the brine pipe 22 at a position sandwiching the straight portion 22A from the opposite side. A pair of attachment pieces 73 are formed by cutting and raising, and are provided at appropriate intervals.

Then, the brine pipe 22 formed in a meandering shape is piped on the panel 72 while inserting the straight portion 22A between the pair of attachment pieces 73 as shown in FIG. As shown in FIG. (B), the protruding ends of the mounting pieces 73 are bent by a pressing machine 74 in directions opposite to each other and fixed to the outer surface of the brine tube 22 (FIG. (C)). The panel 72 to which the brine pipe 22 is fixed in this manner is applied to the surface of the corresponding inner box 12 as shown in FIG.
The heat transfer from the brine tube 22 is once diffused over the entire surface of the panel 72 and is transmitted from the panel 72 to each surface of the inner box 12. Heat exchange can be expected. In addition, since the brine pipe 22 can be attached to the inner box 12 one by one, workability is good.

<Related technology 3>
FIG. 13 shows Related Technique 3. In this related technique 3, the shape of the mounting piece is changed. That is, one attachment piece 75 is as short as the radius of the brine tube 22, and the other attachment piece 76 is about three times as long as it is bent inward at an obtuse angle of 3 degrees. Thus, it is formed so as to form a substantially arc shape.
And as shown in the same figure (A), as shown in the same figure (B), as shown in the same figure (B), after the brine pipe 22 is inserted between both the attachment pieces 75 and 76, it is hung on the press machine 77. The attachment piece 76 is fixed by pressing the upper surface thereof so as to wrap around the brine pipe 22.
The attachment piece 76 can be firmly fixed by being pressed down so as to wind the brine tube 22, and the contact area between the attachment piece 76 and the brine tube 22 can be increased, so that the heat transfer performance between the two is excellent. It will be a thing. The shorter attachment piece 75 may be removed.

<Related technology 4>
14 and 15 show the related art 4. FIG. In this related art 4, both the pair of mounting pieces 83 arranged opposite to each other have a long dimension and are bent inward at an obtuse angle of 3 degrees, like the mounting piece 76 of the related art 3. It is formed so as to form a substantially arc shape.
Then, as shown in FIGS. 14A and 15A, after the brine pipe 22 is inserted between the two attachment pieces 83, a press is applied between the upper and lower molds 85 and 86 of the press machine. 14B, both mounting pieces 83 are wrapped at positions shifted in the axial direction of the brine tube 22, and the upper surface is pressed so as to wrap around the brine tube 22, and further pressed. As shown, the brine tube 22 itself is slightly flattened.

  For example, when the brine tube 22 is previously formed in a meandering shape, distortion may occur in the formation process, and if the panel 72 is fixed as it is, the panel 72 may be warped (see FIG. 15B). In that case, as described above, when further crushing deformation is applied to the brine tube 22, the distortion of the brine tube 22 can be corrected and brought into close contact with the panel 72 as shown in FIG.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) As a heating means for defrosting, besides a cord heater, a belt heater or the like can be applied as long as it can be wired along a brine pipe (bracket).
(2) As the secondary refrigerant used in the storage surface cooling system, in addition to the brine exemplified in the above embodiment, a liquid refrigerant such as water and a gas refrigerant such as air can be used.
(3) Further, the present invention can be similarly applied to a type in which an evaporator (evaporation pipe) constituting the refrigeration apparatus is piped along the warehouse surface and the inside of the warehouse is cooled by circulating the refrigerant therethrough. . In this case, during the defrosting operation, the heating means is energized to generate heat in a state where the operation of the compressor is stopped and the flow of the refrigerant to the evaporation pipe is stopped.

Schematic which shows the whole structure which concerns on Embodiment 1 of this invention Perspective view of inner box Partial front view showing the piping state of the brine pipe XX sectional view of FIG. YY sectional view of FIG. Partial enlarged sectional view of the wall of the main unit Sectional drawing which shows the fixation structure of the brine pipe concerning Embodiment 2. Process diagram of forming a brine pipe according to Embodiment 3 Sectional drawing which shows the state which put the brine pipe in the inner box Process drawing showing fixing operation of brine pipe according to Related Technology 1 Front view showing a fixing structure of a brine pipe according to Related Technology 2 Process diagram showing the fixing operation of the brine pipe Process drawing showing fixing operation of brine pipe according to Related Technology 3 Process drawing showing fixing operation of brine pipe according to Related Technology 4 Process chart explaining the distortion correction operation of the brine pipe Cross section of conventional example

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Main body 11 ... Outer box 12 ... Inner box 13 ... Heat insulating material 22 ... Brine pipe (refrigerant pipe) 22A ... Straight line part 22B ... Turning part 30 ... Bracket 31 ... Ceiling board 32 ... Side board 33 ... Mounting plate 34 ... Mounting surface 35 ... Aluminum foil tape 40 ... Cord heater (heating means) 42 ... Aluminum foil tape 50 ... Bracket 60 ... Brine pipe (refrigerant pipe) B ... Brine

Claims (2)

The main body of the storage is formed by a heat insulating box formed by filling a heat insulating material between the inner box and the outer box, and a refrigerant pipe is provided along the surface of the inner box facing the heat insulating material. In a storage cabinet that cools the interior by circulating a refrigerant through the pipe,
The refrigerant pipe is covered with a thermally conductive bracket, the bracket is fixed to a surface of the inner box facing the heat insulating material, and is in contact with the outer surface of the bracket, and heating means for defrosting is provided. A storage that is provided. 2. The storage according to claim 1, wherein a flat surface having a predetermined width is formed on an outer surface of the bracket, and the flat surface serves as a mounting surface of the heating means.

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