Heat insulation structure

Abstract

To provide a heat insulation structure from which a heat insulation member can be readily removed and in which the removed heat insulation member can be fixed around a safety valve preferably again.SOLUTION: A heat insulation structure 100 for insulating heat from a safety valve 70 of a refrigeration device 1 includes a first heat insulation member 110 that is provided so as to surround the safety valve and can be reversibly attached to and detached from the safety valve.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a thermal insulation structure. [Background technology]

[0002] A refrigeration system generally includes a compressor that compresses gasified refrigerant and discharges the compressed refrigerant, a condenser that condenses and liquefies the refrigerant discharged from the compressor, an expansion valve that expands the refrigerant condensed in the condenser, and an evaporator that evaporates and gasifies the refrigerant expanded by the expansion valve and draws the gasified refrigerant into the compressor.

[0003] Such refrigeration devices are equipped with a safety valve that operates when the pressure inside the refrigeration device exceeds the allowable pressure and returns the pressure inside the refrigeration device to below the allowable pressure (for example, Patent Document 1 listed below). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-49021 Summary of the Invention [Problem to be solved by the invention]

[0005] Such safety valves are required to be removed from the refrigeration unit at least once a year and undergo a voluntary inspection to check whether they are operating safely. In actual practice, the safety valve and piping in the low-temperature section are generally surrounded by heat-insulating material to prevent heat from entering from the outside air and increase energy conservation. Also, surrounding them with heat-insulating material prevents condensation and freezing on the surface of the piping.

[0006] When performing the self-inspection, there is an operation of peeling off the heat-insulating member from the safety valve. However, since the heat-insulating member is fixed to the safety valve by an adhesive or the like, it is difficult to peel it off neatly. And if it is forcibly peeled off, it is difficult to reuse the heat-insulating member and fix it around the safety valve again after the self-inspection is performed.

[0007] The present invention was invented to solve the above problems, and an object thereof is to provide a heat-insulating structure capable of easily peeling off a heat-insulating member and preferably fixing the peeled heat-insulating member around the safety valve again.

Means for Solving the Problems

[0008] The heat-insulating structure according to the present invention that achieves the above object is a heat-insulating structure for heat-insulating a safety valve of a refrigeration device, and has a first heat-insulating member provided so as to surround the safety valve and removably attachable and detachable to and from the safety valve reversibly.

Effects of the Invention

[0009] According to the above heat-insulating structure, since the first heat-insulating member (heat-insulating member) is removably attachable and detachable to and from the safety valve reversibly, the heat-insulating member can be easily peeled off, and the peeled heat-insulating member can be preferably fixed around the safety valve again.

Brief Description of the Drawings

[0010]

Figure 1

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Mode for Carrying Out the Invention

[0011] Embodiments of the present invention will be described with reference to FIGS. 1 to 14. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation and may be different from the actual ratios.

[0012] FIG. 1 is an overall configuration diagram of a refrigeration device 1 including safety valves 70 and 80 to which heat insulation structures 100 and 200 according to embodiments and modifications of the present invention are attached. FIG. 2 is a perspective view showing a piping diagram including the safety valve 70 to which the heat insulation structure 100 according to the present embodiment is attached. FIG. 3 is a front view showing a piping diagram including the safety valve 70 to which the heat insulation structure 100 according to the present embodiment is attached. FIG. 4 is a piping diagram showing a state in which a tape member 131 of the heat insulation structure 100 according to the present embodiment is attached. FIG. 5 is a piping diagram showing a state in which a second heat insulation member 120 of the heat insulation structure 100 according to the present embodiment is further attached with respect to FIG. 4. FIG. 6 is a piping diagram showing a state in which a piping heat insulation member 111 and a flange heat insulation member 112 of a first heat insulation member 110 of the heat insulation structure 100 according to the present embodiment are attached. FIG. 7 is a piping diagram showing a state in which a first safety valve heat insulation member 113A of a safety valve heat insulation member 113 of a first heat insulation member 110 of the heat insulation structure 100 according to the present embodiment is attached with respect to FIG. 6. FIG. 8 is a piping diagram showing a state in which the heat insulation structure 100 according to the present embodiment is attached. FIG. 9 is a perspective view showing a piping diagram including the safety valve 80 to which the heat insulation structure 200 according to the modification is attached. FIG. 10 is a front view showing a piping diagram including the safety valve 80 to which the heat insulation structure 200 according to the modification is attached. FIG. 11 is a piping diagram showing a state in which a tape member 231 of the heat insulation structure 200 according to the modification is attached. FIG. 12 is a piping diagram showing a state in which a second heat insulation member 220 of the heat insulation structure 200 according to the modification is further attached with respect to FIG. 11. FIG. 13 is a piping diagram showing a state in which a nut heat insulation member 211 of a first heat insulation member 210 of the heat insulation structure 200 according to the modification is attached with respect to FIG. 12. FIG. 14 is a piping diagram showing a state in which a safety valve heat insulation member 213 of a first heat insulation member 210 of the heat insulation structure 200 according to the modification is attached with respect to FIG. 13. In the drawings, the members painted in gray indicate the heat insulation structures 100 and 200.

[0013] First, with reference to FIG. 1, the configuration of the refrigeration device 1 including the safety valves 70 and 80 will be described.

[0014] As shown in Fig. 1, the refrigeration device 1 includes a refrigerator 10, a circulation line 20 through which a CO2 refrigerant circulates, a CO2 receiver 30 for storing the CO2 refrigerant, an ammonia refrigeration cycle 40 including a circulation line 46 through which an ammonia refrigerant circulates, a cooling circuit 50 through which an antifreeze circulates, and a cooling tower 60 connected to the cooling circuit 50.

[0015] Since the refrigerator 10 is a known refrigerator, detailed description thereof is omitted.

[0016] The circulation line 20 is configured such that the CO2 refrigerant circulates. As shown in Fig. 1, the circulation line 20 includes a CO2 supply line 21 that sends liquid CO2 refrigerant from the CO2 receiver 30 to the refrigerator 10, a CO2 return line 22 that returns the gas-liquid mixed CO2 refrigerant coming out of the refrigerator 10 to the CO2 receiver 30, and a re-liquefaction line 23 that re-liquefies the vaporized CO2 refrigerant.

[0017] As shown in Fig. 1, the CO2 supply line 21 is connected below the CO2 receiver 30. Also, as shown in Fig. 1, the CO2 return line 22 is connected above the CO2 receiver 30.

[0018] Further, a first pump P1 is provided in the CO2 supply line 21, and the liquid CO2 refrigerant in the CO2 receiver 30 flows into the refrigerator 10 by the first pump P1.

[0019] The re-liquefaction line 23 is connected above the CO2 receiver 30. The gaseous CO2 refrigerant in the CO2 receiver 30 is re-liquefied by a heat exchanger 41 of the ammonia refrigeration cycle 40 described later when passing through the re-liquefaction line 23. Then, the re-liquefied liquid CO2 refrigerant returns to the CO2 receiver 30.

[0020] A safety valve 80 is provided in the re-liquefaction line 23 leading to the CO2 receiver 30. The safety valve 80 is provided to operate when the pressure of the gaseous CO2 refrigerant exceeds the allowable pressure and return the pressure of the gaseous CO2 refrigerant to below the allowable pressure.

[0021] In the ammonia refrigeration cycle 40, ammonia refrigerant circulates. The ammonia refrigeration cycle 40 cools and liquefies gaseous CO2 refrigerant. As shown in FIG. 1, the ammonia refrigeration cycle 40 includes a heat exchanger (cascade condenser) 41 as an evaporator, a refrigerator 42 as a compressor, a condenser 43, an ammonia receiver 44, an expansion valve 45, and a circulation line 46 through which ammonia refrigerant circulates.

[0022] In the heat exchanger 41, the ammonia refrigerant gas evaporated by the heat of the gaseous CO2 refrigerant is compressed by the refrigerator 42. The high-temperature and high-pressure ammonia refrigerant gas is cooled and condensed in the condenser 43. The liquefied ammonia refrigerant liquid is stored in the ammonia receiver 44. The ammonia refrigerant liquid in the ammonia receiver 44 is sent to the expansion valve 45 and expanded. The low-pressure ammonia refrigerant liquid is sent to the heat exchanger 41 and used to cool the gaseous CO2 refrigerant.

[0023] A safety valve 70 is provided in the heat exchanger 41 of the ammonia refrigeration cycle 40. The safety valve 70 is provided to operate when the pressure of the ammonia refrigerant gas exceeds the allowable pressure and return the pressure of the ammonia refrigerant gas to below the allowable pressure.

[0024] A cooling circuit 50 is installed in the condenser 43. From the viewpoint of preventing the freezing accident of the liquid staying in the cooling circuit 50 during the stop of the refrigeration device 1, it is preferable to use antifreeze as the liquid circulating in the cooling circuit 50. The antifreeze circulating in the cooling circuit 50 is heated by the ammonia refrigerant in the condenser 43. Note that the liquid circulating in the cooling circuit 50 is not limited to antifreeze and may be cooling water.

[0025] The cooling circuit 50 is connected to a cooling tower 60. The antifreeze is circulated through the cooling circuit 50 by a cooling water pump 51. The antifreeze that has absorbed the exhaust heat of the ammonia refrigerant in the condenser 43 comes into contact with the outside air and the sprayed water in the cooling tower 60 and is cooled by the latent heat of evaporation of the sprayed water.

[0026] Hereinafter, the configuration of the heat insulation structure 100 attached to the safety valve 70 will be described as an embodiment with reference to FIGS. 2 to 8, and the configuration of the heat insulation structure 200 attached to the safety valve 80 will be described as a modified example with reference to FIGS. 9 to 14.

[0027] <Heat insulation structure 100 according to the embodiment> First, with reference to FIGS. 2 to 8, the configurations of the heat insulation structure 100, the safety valve 70, the pipe 160, etc. according to the embodiment will be described.

[0028] As shown in FIG. 2, the safety valve 70 is connected to the pipe 160 via a pair of flanges 150.

[0029] As shown in FIGS. 2 and 3, the pipe 160 includes a first pipe 161 provided on the side of the heat exchanger 41, a second pipe 162 connected so as to intersect the first pipe 161, and a third pipe 163 connected so as to intersect the second pipe 162. The third pipe 163 is connected to the safety valve 70 via a pair of flanges 150.

[0030] As shown in FIGS. 4 to 8, the heat insulation structure 100 includes a first heat insulation member 110 disposed around the safety valve 70 and the third pipe 163, a second heat insulation member 120 fixed to the second pipe 162, and a seal portion 130 that seals the gap between the second pipe 162 and the second heat insulation member 120.

[0031] As shown in FIGS. 6 to 8, the first heat insulation member 110 includes a pipe heat insulation member 111 disposed around the third pipe 163, a flange heat insulation member 112 disposed around a pair of flanges 150, and a safety valve heat insulation member 113 disposed around the safety valve 70.

[0032] The flange heat insulation member 112 includes a first flange heat insulation member 112A disposed on the back side of the paper in FIGS. 6 and 7, and a second flange heat insulation member 112B disposed on the front side of the paper in FIGS. 6 and 7.

[0033] The heat insulation member 111 for piping has a shape that can be covered from above by making a cut at the lower part to make it semi-divided. According to this shape, it is possible to enhance the heat insulation effect while enabling removal.

[0034] The heat insulation member 112A for the first flange is composed of a thin plate-shaped heat insulation material. The heat insulation member 112A for the first flange is arranged to surround the outer periphery of the flange 150 so that the lower part is open, and the lower part is fixed by being stopped with Magic Tape (registered trademark) to prevent it from falling off.

[0035] The heat insulation member 111 for piping and the heat insulation member 112B for the second flange have a shape that can be covered from above by, for example, indenting the part corresponding to the protrusion of the bolt so as to surround the protrusion of the bolt and making a cut into the hollow part through which the pipe passes to make it semi-divided. According to this shape, it is possible to enhance the heat insulation effect while enabling removal. Note that the heat insulation member 112A for the first flange and the heat insulation member 112B for the second flange may be integrally formed.

[0036] The heat insulation member 113 for the safety valve includes a first heat insulation member 113A for the safety valve disposed on the left side of FIG. 8 and a second heat insulation member 113B for the safety valve disposed on the right side of FIG. 8. The first heat insulation member 113A for the safety valve has a U shape because a discharge pipe is connected to the discharge portion 79 (see FIG. 2 etc.) of the safety valve 70. The first heat insulation member 113A for the safety valve has a U shape at the location where the discharge pipe is disposed, and is cut vertically so as to be covered from above, and is disposed from above the heat insulation member 111 for piping, the heat insulation member 112 for flange, and the safety valve 70 so that the lower part is open. The vertically cut portions are fixed by being stopped with magic tape (registered trademark). That is, the first heat insulation member 113A for the safety valve is disposed so as to cover the heat insulation member 111 for piping and the heat insulation member 112 for flange. The second heat insulation member 113B for the safety valve is configured to cover up to the tip on the side of the first heat insulation member 113A including the tip portion 71 of the safety valve 70 so that no gap is generated between the second heat insulation member 113B and the first heat insulation member 113A. Since the first heat insulation member 110 is configured as described above, it can be reversibly attached to and detached from the safety valve 70. Note that the second heat insulation member 113B for the safety valve may be configured to enter inside the first heat insulation member 113A.

[0037] As shown in FIG. 5, the second heat insulation member 120 is disposed on the outer periphery of the second pipe 162. The second heat insulation member 120 includes a flat portion 121 having a flat outer peripheral surface. An opening 120H is provided in the flat portion 121, and a caulking portion 132 is formed by caulking the gap between the second heat insulation member 120 and the third pipe 163 at the opening 120H. The flat portion 121 is formed to ensure the length of the heat insulation member 111 for piping. The flat portion 121 is formed to apply a tool when removing the safety valve 70 during inspection.

[0038] The materials constituting the first heat insulation member 110 and the second heat insulation member 120 are not particularly limited, and for example, a foamed rubber heat insulating material can be used. By using a foamed rubber heat insulating material, since the heat insulating material itself has no water absorption, moisture-proof construction is unnecessary.

[0039] The seal part 130 has a tape member 131 shown in FIG. 4 and a caulking part 132 shown in FIG. 5. It is preferable that the thickness of the tape member 131 is larger than the gap between the second heat insulation member 120 and the second pipe 162.

[0040] Next, with reference to FIGS. 4 to 8, a method for attaching the heat insulation structure 100 according to the present embodiment will be described.

[0041] First, as shown in FIG. 4, an operator arranges and fixes the tape member 131 on the outer periphery of the second pipe 162. The method for fixing the tape member 131 to the second pipe 162 is not particularly limited, but for example, it is fixing with an adhesive.

[0042] Next, as shown in FIG. 5, the operator arranges and fixes the second heat insulation member 120 on the outer peripheries of the second pipe 162 and the tape member 131. As a result, the second pipe 162 is covered with the second heat insulation member 120 and heat-insulated. The second heat insulation member 120 is configured to cover a part of the third pipe 163 as shown in FIG. 5.

[0043] Next, the operator forms the caulking part 132 by caulking between the opening 120H of the second heat insulation member 120 and the third pipe 163. Thus, unlike the safety valve 80, the caulking part 132 and the tape member 131 are provided at different locations. This is because since the second heat insulation member 120 has a flange shape, due to the relationship of the tools for the removal work, by providing the flat part 121 on the second heat insulation member 120, the length of the tape member 131 cannot be obtained. Thus, even when the caulking part 132 and the tape member 131 are provided at different locations, there is no problem with the heat insulation performance.

[0044] Next, as shown in FIG. 6, the operator arranges the heat insulation member 111 for pipes on the outer periphery of the third pipe 163 and arranges the heat insulation member 112 for flanges with respect to the pair of flanges 150.

[0045] Next, as shown in FIG. 7, the operator arranges the first heat-insulating member 113A for the safety valve of the heat-insulating member 113 for the safety valve on the outer periphery of the safety valve 70. Here, the first heat-insulating member 113A having a U-shape is arranged from above the safety valve 70 so that the lower part is open, and the lower part is fixed by being fastened with a magic tape (registered trademark).

[0046] Next, as shown in FIG. 8, the operator arranges the second heat-insulating member 113B for the safety valve of the heat-insulating member 113 for the safety valve so as to cover the tip 71 of the safety valve 70.

[0047] Next, a method for removing the first heat-insulating member 110 when inspecting the safety valve 70 will be described.

[0048] When removing the safety valve 70 from the pipe 160 in order to inspect the safety valve 70, the operator removes the heat-insulating member 113 for the safety valve, the heat-insulating member 112 for the flange, and the heat-insulating member 111 for the pipe in this order, which is the reverse order of the order in which the first heat-insulating member 110 was attached. At this time, according to the heat-insulating structure 100 according to the present embodiment, the heat-insulating member 113 for the safety valve, the heat-insulating member 112 for the flange, and the heat-insulating member 111 for the pipe can be easily removed. Further, after removing the heat-insulating member 113 for the safety valve, the heat-insulating member 112 for the flange, and the heat-insulating member 111 for the pipe, the heat-insulating member 113 for the safety valve, the heat-insulating member 112 for the flange, and the heat-insulating member 111 for the pipe can be preferably fixed again around the safety valve 70.

[0049] Note that there is a gap between the heat-insulating member 113 for the safety valve and the safety valve 70, and between the heat-insulating member 111 for the pipe and the third pipe 163. Therefore, for example, when the tape member 131 and the caulking portion 132 of the seal portion 130 do not exist, water generated by condensation may enter the inside of the pipe 160, and rust may be generated in the pipe 160. On the other hand, since the heat-insulating structure 100 according to the present embodiment has the tape member 131 and the caulking portion 132 of the seal portion 130, it is possible to preferably prevent water from entering the inside of the pipe 160 and suppress the generation of rust in the pipe 160.

[0050] As described above, the heat insulation structure 100 according to the present embodiment is a heat insulation structure 100 for heat-insulating the safety valve 70 of the refrigeration device 1, and is provided so as to surround the safety valve 70 and has a first heat insulation member 110 that is reversibly detachable from the safety valve 70. According to the heat insulation structure 100 configured in this way, since the first heat insulation member 110 is reversibly detachable from the safety valve 70, the first heat insulation member 110 can be easily peeled off, and the peeled first heat insulation member 110 can be suitably fixed around the safety valve 70 again.

[0051] Further, the heat insulation structure 100 is provided so as to surround the second pipe 162 of the refrigeration device 1, and further includes a second heat insulation member 120 fixed to the second pipe 162 of the refrigeration device 1, and a seal portion 130 that seals the gap between the second pipe 162 and the second heat insulation member 120. According to the heat insulation structure 100 configured in this way, it is possible to preferably prevent water from entering the inside of the pipe 160 and suppress the generation of rust on the pipe 160.

[0052] Further, the seal portion 130 is formed by a caulking portion 132 caulked between the opening 120H of the second heat insulation member 120 facing the first heat insulation member 110 and the second pipe 162. According to the heat insulation structure 100 configured in this way, it is possible to more preferably prevent water from entering the inside of the pipe 160 and more preferably suppress the generation of rust on the pipe 160.

[0053] Further, the seal portion 130 is formed by a tape member 131 disposed in the gap between the second pipe 162 and the second heat insulation member 120. According to the heat insulation structure 100 configured in this way, it is possible to prevent water from entering the inside of the pipe 160 with a simple configuration and preferably suppress the generation of rust on the pipe 160.

[0054] Further, the first heat insulation member 110 is a foamed rubber heat insulating material. According to the heat insulation structure 100 configured in this way, since the heat insulating material itself has no water absorption, moisture-proof construction is unnecessary.

[0055] <Heat insulation structure 200 according to a modified example> Next, with reference to FIGS. 9 to 14, the configurations of the heat insulation structure 200, the safety valve 80, the pipe 260, etc. according to the modified example will be described.

[0056] As shown in FIG. 9, the safety valve 80 is connected to the pipe 260 via the nut 250.

[0057] As shown in FIGS. 9 and 10, the pipe 260 has a first pipe 261 connected to the heat exchanger 41 side, a second pipe 262 connected so as to intersect the first pipe 261, and a third pipe 263 connected so as to intersect the second pipe 262. The third pipe 263 is connected to the safety valve 80 via the nut 250.

[0058] As shown in FIGS. 11 to 14, the heat insulation structure 200 includes a first heat insulation member 210 disposed around the safety valve 80 and the nut 250, a second heat insulation member 220 fixed to the second pipe 262 and the third pipe 263, and a seal portion 230 that seals the gap between the third pipe 263 and the second heat insulation member 220.

[0059] As shown in FIGS. 11 to 14, the first heat insulation member 210 has a heat insulation member 211 for nut disposed around the nut 250 and a heat insulation member 213 for safety valve disposed around the heat insulation member 211 for nut and the safety valve 80.

[0060] The heat insulation member 211 for nut has a first heat insulation member 211A provided below and a second heat insulation member 211B provided above. Note that the first heat insulation member 211A and the second heat insulation member 211B may be integrally formed.

[0061] The heat insulation member 213 for safety valve is configured to cover the heat insulation member 211 for nut and the entire safety valve 80. Since the first heat insulation member 210 is configured as described above, it can be reversibly attached to and detached from the safety valve 70.

[0062] The seal portion 230 includes a tape member 231 shown in FIG. 11 and a caulking portion 232 shown in FIG. 12.

[0063] Next, with reference to FIGS. 11 to 14, a method for attaching the heat insulation structure 200 according to the modified example will be described.

[0064] First, as shown in FIG. 11, an operator arranges and fixes the tape member 231 on the outer periphery of the third pipe 263.

[0065] Next, as shown in FIG. 12, the operator arranges and fixes the second heat insulation member 220 on the outer peripheries of the second pipe 262 and the third pipe 263. As a result, the second pipe 262 and the third pipe 263 are covered with the second heat insulation member 220 and insulated.

[0066] Next, the operator forms the caulking portion 232 by caulking between the opening 220H of the second heat insulation member 220 and the third pipe 263.

[0067] Next, as shown in FIG. 13, the operator arranges the heat insulation member 211 for nut on the outer periphery of the nut 250. At this time, the nut 250 is fitted from the location where the cut is made on the side of the heat insulation member 211 for nut and fixed with Magic Tape (registered trademark).

[0068] Next, as shown in FIG. 14, the operator arranges the heat insulation member 213 for safety valve on the outer periphery of the safety valve 80. At this time, the safety valve 80 is covered from the location where the cut is made on the heat insulation member 213 for safety valve and fixed with Magic Tape (registered trademark).

[0069] Next, a method for removing the first heat insulation member 210 when inspecting the safety valve 80 will be described.

[0070] In order to inspect the safety valve 80, when removing the safety valve 80 from the pipe 260, the operator removes the heat insulation member 213 for the safety valve and the heat insulation member 211 for the nut in the reverse order of the order in which the first heat insulation member 210 was attached. At this time, according to the heat insulation structure 200 according to the modified example, the heat insulation member 213 for the safety valve and the heat insulation member 211 for the nut can be easily removed. Further, after removing the heat insulation member 213 for the safety valve and the heat insulation member 211 for the nut, the heat insulation member 213 for the safety valve and the heat insulation member 211 for the nut can be preferably fixed again around the safety valve 80.

[0071] Note that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

[0072] For example, in the above-described embodiment, the heat insulation structure has the second heat insulation member and the seal portion, but it may not have these.

[0073] Further, in the above-described embodiment, the first heat insulation member 110 is a foamed rubber heat insulating material, but it is not limited thereto, and it may be a fiber-based heat insulating material, a foamed plastic-based heat insulating material, or the like.

[0074] Further, in the above-described embodiment, each heat insulation member is fixed by a magic tape (registered trademark), but the fixing means is not limited to the magic tape (registered trademark), and it may be tied with a string or fixed with a fastener.

[0075] Further, when there is no service valve (when the safety valve is directly attached to the pipe), the second heat insulation member may be configured to be wound around the pipe.

[0076] Further, in the above-described embodiment, the first heat insulation member 110 is reversibly detachable by making a cut, but it may be configured to have a plurality of cuts and be fixed with a magic tape (registered trademark) or the like.

Explanation of reference numerals

[0077] 1 Refrigeration device 70, 80 safety valves, 100, 200 heat insulation structures, 110, 210 first heat insulation members, 120, 220 second heat insulation members, 130, 230 seal parts, 131, 231 tape members, 132, 232 caulking parts, 160, 260 pipes.

Claims

1. A heat insulation structure for heat-insulating a safety valve of a refrigeration device, The heat insulation structure is provided so as to surround the safety valve and has a first heat insulation member that is reversibly detachable from the safety valve.

2. A second heat insulation member provided so as to surround the piping of the refrigeration device and fixed to the piping of the refrigeration device, The heat insulation structure according to claim 1, further comprising a seal portion that seals a gap between the piping and the second heat insulation member.

3. The heat insulation structure according to claim 2, wherein the seal portion is formed by a caulking portion caulked between an opening of the second heat insulation member facing the first heat insulation member and the piping.

4. The heat insulation structure according to claim 2 or 3, wherein the seal portion is formed by a tape member disposed in a gap between the piping and the second heat insulation member.

5. The heat insulation structure according to claim 1, wherein the first heat insulation member is a foamed rubber heat insulating material.

Images