Cooling storage

Abstract

To sufficiently increase the temperature around a cooler without increasing the surface temperature of a defrosting heater during a defrosting operation, in a cooling storage using a combustible refrigerant.SOLUTION: A cooling storage includes: a cooling storage body 12 which has a storage chamber R3 for storing an object to be cooled, and a cooler chamber R4 for storing a cooler 42 for cooling the storage chamber R3; a refrigeration cycle type cooling device 30 which includes the cooler 42 and in which a combustible refrigerant circulates; a circulation fan 60 which circulates the air between the storage chamber R3 and the cooler chamber R4; and two or more defrosting heaters 64, 65 each of which is a long heater for melting the frost generated by the cooler 42, and each of which is operated at the temperature in which the surface temperature is equal to or lower than an ignition temperature of the combustible refrigerant by a setting temperature. The circulation fan 60 circulates the air in the vertical direction in the cooler chamber R4, and the two or more defrosting heaters 64, 65 are in parallel with each other and disposed side by side in the vertical direction right under the cooler 42.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a refrigerated storage facility. [Background technology]

[0002] In recent years, natural refrigerants have been used as refrigerants in refrigeration cycle-type refrigerant storage facilities, which circulate a refrigerant, as an effort to be environmentally friendly. Natural refrigerants are flammable refrigerants, and it is necessary to deal with the case where such flammable refrigerants leak. As disclosed in Patent Document 1 below, frost may form on refrigerated storage facilities during cooling operation, and conventionally, defrost heaters have been provided to melt the frost. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-215751 Summary of the Invention [Problem to be solved by the invention]

[0004] In a refrigerated storage cabinet using a flammable refrigerant as described above, in order to deal with a case where the flammable refrigerant leaks, the surface temperature of the defrost heater cannot be raised to the temperature of a refrigerated storage cabinet that does not use a flammable refrigerant. Therefore, in a refrigerated storage cabinet using a flammable refrigerant, there is a problem in that it is difficult to sufficiently raise the temperature around the cooler during defrosting operation.

[0005] The present invention has been made in consideration of such circumstances, and an object of the present invention is to sufficiently increase the temperature around the cooler during defrosting operation in a refrigerated storage facility that uses a flammable refrigerant, without increasing the surface temperature of the defrost heater. [Means for solving the problem]

[0006] In order to solve the above problems, the refrigerated storage facility disclosed in the present application has the following configuration. (1) A refrigerator body having a storage chamber for storing an object to be cooled and a cooler chamber for accommodating a cooler for cooling the storage chamber; a refrigeration cycle type cooling device including the cooler and in which a flammable refrigerant circulates; a circulation fan that circulates air between the storage chamber and the cooler chamber; two or more defrost heaters, each of which is a longitudinal heater that melts frost generated by the cooler and operates at a surface temperature equal to or lower than a temperature that is lower by a set temperature than the ignition temperature of the flammable refrigerant; Equipped with The circulation fan causes air to flow vertically within the cooling chamber, The two or more defrost heaters are arranged directly below the cooler, parallel to each other and aligned in the vertical direction.

[0007] The refrigerated storage cabinet disclosed herein is based on a refrigeration cycle cooling system that uses a flammable refrigerant. Therefore, the surface temperature of the defrost heater is set low enough to prevent the flammable refrigerant from igniting. However, using two or more defrost heaters ensures a temperature sufficient to melt frost around the cooler during defrosting operation. Although two or more defrost heaters are arranged in the cooler chamber, they are arranged parallel to the direction of airflow generated by the circulation fan. This minimizes the airflow area, as compared to a single defrost heater, thereby minimizing the impact on airflow during cooling operation. It is desirable to arrange two or more defrost heaters as close as possible to each other. This configuration allows the defrost heater farthest from the cooler to be positioned as close as possible to the cooler, while also minimizing the amount of air flowing between the defrost heaters.

[0008] Furthermore, the cooling storage cabinet having the above-described configuration can be configured in various ways as shown below.

[0009] (2) A cover member is provided to cover at least a portion of the two or more defrost heaters while holding them in a vertically aligned state, The cooling storage container according to claim (1), wherein the cover member has a plurality of openings penetrating from the inside to the outside.

[0010] In a refrigerated storage cabinet with this configuration, the cover member also functions as a holder that holds two or more defrost heaters together. Therefore, a refrigerated storage cabinet with this configuration can be manufactured simply by attaching two or more defrost heaters to the cover member and then attaching the cover member to the member that forms the cooler chamber. Note that because the cover member covers at least a portion of the defrost heater, the flow of air during cooling operation and the flow of heater heat during defrosting operation are impaired. However, the cover member has multiple openings that facilitate air flow and heat transfer to the cooler.

[0011] (3) The cover member has a roof portion that covers the upper part of the two or more defrost heaters, The cooling storage facility according to item (2), wherein the roof portion has an upper surface opening formed therein that penetrates vertically at a position that does not overlap vertically with the two or more defrost heaters.

[0012] In this cooling storage cabinet, the cover member has a roof portion, which prevents defrost water from the cooler from dripping onto the defrost heater, and the roof portion has an opening, which allows heat from the defrost heater to be effectively transferred to the cooler.

[0013] (4) The cover member has a pair of holding portions that hold each of the two or more defrost heaters at both ends in the longitudinal direction, The cooling storage container according to item (3), wherein the pair of holding portions have side openings formed therein that penetrate in the direction in which the defrost heater extends.

[0014] In a refrigerated storage cabinet with this configuration, when air flows from bottom to top within the cooling chamber, the air flows inside the cover member. Furthermore, the presence of the roof section can cause air to stagnate in the corner formed by the roof section and the holding section. This configuration of the refrigerated storage cabinet allows the air near the corner to flow outward through the side opening, ensuring efficient air circulation. [Effects of the Invention]

[0015] According to the present invention, in a refrigerated storage cabinet using a flammable refrigerant, the temperature around the cooler can be sufficiently increased during defrosting operation without increasing the surface temperature of the defrost heater. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view of a cooling storage unit according to an embodiment of the present invention; [Figure 2] Side cross-sectional view of the cooling storage facility [Figure 3] Enlarged cross-sectional side view showing the second cooler chamber and its surroundings [Figure 4] A front view of the inside of the second cooler chamber [Figure 5] Perspective view of the defrosting unit [Figure 6] An enlarged view of the defrosting unit and its surroundings in FIG. [Figure 7] A diagram showing the defrosting unit and its surroundings from an above view DETAILED DESCRIPTION OF THE INVENTION

[0017] <Outline of the cooling storage facility> A refrigerated storage cabinet 10 according to an embodiment of the present invention will be described with reference to Figures 1 to 7. Note that in some of the drawings, directions are indicated using the symbols F, B, L, R, U, and D, which respectively represent the near side (front side), far side (rear side), left side, right side, upper side, and lower side when the refrigerated storage cabinet 10 is viewed from the front.

[0018] As shown in FIGS. 1 and 2, the refrigerator 10 of this embodiment is a two-door, vertical refrigerator-freezer. It includes a refrigerator body 12 having a generally rectangular parallelepiped shape elongated in the vertical direction and two doors 14U and 14D. The refrigerator body 12 is primarily composed of an insulated box 16 that opens forward. As shown in FIG. 2, the insulated box 16 includes an outer box 16a made of stainless steel, an inner box 16b also made of stainless steel, and a thermal insulator 16c made of foamed resin such as urethane foam, which is filled between the outer box 16a and the inner box 16b. The refrigerator body 12 also includes a thermally insulated partition wall 18, filled with a thermal insulator, fixed near the vertical center of the insulated box 16. The partition wall 18 divides the insulated box 16 into two airtight spaces, upper and lower, called SU and SD. Each of the two opening / closing doors 14U, 14D is an insulated door filled with insulating material inside, and is rotatable around an axis extending in the vertical direction provided at one end in the left-right direction (the right end in this embodiment), thereby opening and closing the upper space SU and the lower space SD, respectively.

[0019] Most of the upper space SU is designated as a first storage chamber R1 for storing stored items. However, a cooling duct 20 is disposed above the first storage chamber R1, and a first cooler chamber R2 is defined above the cooling duct 20. The cooling duct 20 is provided with an intake port 20a at its front end for drawing air from the first storage chamber R1 into the first cooler chamber R2, and an outlet port 20b at its rear end for blowing air from the first cooler chamber R2 into the first storage chamber R1. Similarly, most of the lower space SD is designated as a second storage chamber R3 for storing stored items. However, a rear duct 22 is disposed in front of the rear wall 16d of the insulated box 16, and a second cooler chamber R4 is defined between the rear wall 16d and the rear duct 22. This rear duct 22 has an intake port 22a at its lower end for drawing air from the second storage chamber R3 into the second cooler chamber R4, and an outlet port 22b at its upper end for blowing air from the second cooler chamber R4 into the second storage chamber R3.

[0020] A machine room R5 with an open top is provided above the refrigerator main body 12. The machine room R5 houses a part of the cooling device 30 (compressor 34, condenser 35, condenser fan 36) for cooling the storage rooms R1 and R3, as well as a control device 32 that controls the cooling storage room 10. The cooling device 30 includes the compressor 34, the condenser 35, a first capillary tube (which may be an expansion valve) 37, a second capillary tube 38, a first cooler 40 in the first cooler chamber R2, a second cooler 42 in the second cooler chamber R4, and a refrigerant pipe 44. A three-way valve 45 is provided downstream of the condenser 35, and the refrigerant pipe 44 branches from the three-way valve 45 into the first capillary tube 37 and the second capillary tube 38, which are connected to the first cooler 40 and the second cooler 42, respectively. That is, the compressor 34, the condenser 35, the first capillary tube 37, and the first cooler 40 form a first cooling circuit (refrigeration cycle) that circulates the refrigerant, and the compressor 34, the condenser 35, the second capillary tube 38, and the second cooler 42 form a second cooling circuit (refrigeration cycle). In the present embodiment, the first storage chamber R1 and the second storage chamber R3 can be controlled to different temperatures, with the first storage chamber R1 serving as a freezer chamber for freezing stored items, and the second storage chamber R3 serving as a refrigerator chamber for refrigerating stored items. In this embodiment, the refrigerant circulated in the refrigerant pipe 44 is a natural refrigerant (flammable refrigerant) such as isobutane or propane, in consideration of the global environment.

[0021] The components constituting the first cooling circuit are mounted on a heat-insulating unit stand 46 and unitized. The unit stand 46 is formed to be slightly larger than the opening 16f formed in the ceiling wall 16e of the heat-insulating box body 16, and is disposed on the ceiling wall 16e so as to cover the opening 16f. The compressor 34, condenser 35, and condenser fan 36 are mounted on the upper surface of the unit stand 46. Meanwhile, the first cooler 40 is mounted on the lower surface of the unit stand 46, and is housed in a first cooler chamber R2 formed by the ceiling (ceiling wall 16e and unit stand 46) and the cooling duct 20.

[0022] <Configuration of the upper space> First, the configuration inside the upper space SU will be described. The first cooler chamber R2 in the upper space SU accommodates the first cooler 40 and a first interior fan 48 driven by a motor. This first interior fan 48 is attached above the intake port 20a of the cooling duct 20. During cooling operation, the first interior fan 48 is driven to draw air from the first storage chamber R1 through the intake port 20a into the first cooler chamber R2. The cooled air then undergoes heat exchange while passing through the first cooler 40, and is blown out into the first storage chamber R1 through the outlet 20b. This circulates the air inside the upper space SU, cooling the first storage chamber R1.

[0023] Furthermore, when the open / close door 14U is opened or closed, moist air may enter the first storage chamber R1. If this moist air flows into the first cooler chamber R2, frost will form inside the first cooler chamber R2. Frost is particularly likely to form on the first cooler 40. To melt the frost that has formed on the first cooler 40, the first cooler chamber R2 also houses a defrost heater 50. As shown in FIG. 2 , the defrost heater 50 is attached to the lower edge of the cooler box that constitutes the first cooler 40. As described above, the refrigerated storage cabinet 10 of this embodiment uses a flammable refrigerant. Therefore, safety considerations must be taken into account in the event of a flammable refrigerant leaking from the first cooler 40. Therefore, the surface temperature of the defrost heater 50 must be lower than that of conventional refrigerated storage cabinets that use fluorocarbon refrigerants. Therefore, in this embodiment, the defrost heater 50 is controlled so that its surface temperature is equal to or lower than a temperature (preset temperature) that is 100 K lower than the ignition temperature of the refrigerant.

[0024] The defrost water generated by melting the refrigerant by the defrost heater 50 is received by the cooling duct 20. The cooling duct 20 is inclined downward toward the rear, and the water is discharged from the drain groove 20c at the rear end to the outside of the refrigerator via a drain pipe (not shown) provided inside the rear wall 16d of the heat-insulating box body 16.

[0025] <Configuration of the lower space> Next, the configuration inside the lower space SD will be described. The second cooler 42 arranged in the lower space SD is for cooling the second storage compartment R3, which is a refrigerator compartment, and therefore can have a smaller cooling capacity than the first cooler 40, which cools the first storage compartment R1, which is a freezer compartment. In other words, the second cooler 42 can be smaller in size than the first cooler 40, and as shown in Figure 3, its width in the front-to-rear direction is made smaller. Therefore, the width of the second cooler compartment R4 in the front-to-rear direction is also made smaller.

[0026] As shown in FIG. 2, the second cooler chamber R4 accommodates the second cooler 42 and a second interior fan (circulation fan) 60 driven by a motor. The second interior fan 60 is disposed above the second cooler 42 and behind the air outlet 22b of the rear duct 22. During cooling operation, the second interior fan 60 is driven to draw air from the second storage chamber R3 into the second cooler chamber R4 through the air inlet 22a. The air then exchanges heat while passing through the second cooler 42, generating cool air, which is then blown out into the second storage chamber R3 through the air outlet 22b. This circulates the air in the lower space SD, cooling the second storage chamber R3.

[0027] Further, in order to melt frost adhering to the second cooler 42, a defrosting unit 62 is housed in the second cooler chamber R4. As shown in FIGS. 3 to 6, this defrosting unit 62 is configured to include two defrosting heaters 64, 65 and a heater holder 66 that holds the two defrosting heaters 64, 65. As described above, the refrigerant used in the refrigerated storage cabinet 10 of this embodiment is a flammable refrigerant, and therefore safety must be taken into consideration in the event of leakage of the flammable refrigerant from the second cooler 42. The two defrosting heaters 64, 65 are elongated double-glass tube heaters, and their surface temperatures are controlled to be equal to or lower than a temperature (set temperature) that is 100 K lower than the ignition temperature of the flammable refrigerant.

[0028] The heater holder 66 is formed by bending a single sheet of plate material and is elongated in the left-right direction and opens forward and downward. Specifically, the heater holder 66 includes a wall portion 67 that forms a wall surface extending left-right and up-down, a pair of holding portions 68, 69 that extend forward from the left and right ends of the wall portion 67 and hold both longitudinal ends of the two defrost heaters 64, 65, and a roof portion 70 that extends forward from the upper end of the wall portion 67 and covers the two defrost heaters 64, 65. The wall portion 67 is formed with a pair of fastening portions 67a that extend from both left and right ends, and the defrost unit 62 is fastened to the rear wall 16d of the insulating box 16 at the pair of fastening portions 67a.

[0029] Here, the mounting structure of the defrost heaters 64, 65 to the heater holder 66 will be described. First, the defrost heaters 64, 65 are double-glass tube heaters and have decompression hole marks 64a, 65a formed when decompression holes for reducing the pressure between the glass tubes are sealed (see FIG. 4). The decompression hole marks 64a, 65a are formed to protrude radially from the cylindrical glass tube bodies 64b, 65b. Therefore, if the defrost heaters 64, 65 rotate around their axes while held by the heater holder 66, the decompression hole marks 64a, 65a may come into contact with each other or the heater holder 66. In addition, caps 74 are attached to both ends of the defrost heaters 64, 65. These caps 74 insulate and seal the internal heating wires and also allow the wiring 64c, 65c connected to each end to be routed to the outside. To prevent defrost water from entering the holes for leading out the wires 64c, 65c, the cap 74 is formed with a visor portion 74a that slopes downward toward the tip, and the wires 64c, 65c are led out from the underside of the visor portion 74a. Therefore, if the defrost heaters 64, 65 rotate around their axes while held by the heater holder 66, the visor portion 74a will not function, and there is a risk that defrost water will enter the inside of the defrost heaters 64, 65.

[0030] Therefore, the refrigerated storage cabinet 10 of this embodiment is configured to reliably prevent rotation of the defrost heaters 64, 65 around their axes. As described above, the heater holder 66 holds both ends of the defrost heaters 64, 65 with a pair of holding portions 68, 69. As shown in FIG. 6, the holding portions 68 are formed with two insertion holes 68a, 68b through which the tips of the caps 74 are inserted. The holding portion 68 includes a base portion 68c on the wall surface portion 67 side and three extension portions 68d, 68e, 68f that extend forward from the base portion 68c and are aligned vertically. The top extension portion 68d extends straight, while the remaining two extension portions 68e, 68f are generally L-shaped with their tips extending upward. With this configuration, the holding portion 68 has insertion holes 68a, 68b formed between the overhanging portions 68d, 68e and between the overhanging portions 68e, 68f. The holding portion 69 has a similar configuration.

[0031] The cap 74 has a cap body 74b that opens at one end and into which the glass tube bodies 64b and 65b are fitted, and a protrusion 74c that protrudes from the other end of the cap body 74b. The protrusion 74c is cylindrical with an outer diameter smaller than that of the cap body 74b. However, the upper half of the base end 74c1 of the protrusion 74c is rectangular and protrudes radially from the outer circumferential surface of the cylindrical portion 74c2, which is the tip end of the protrusion 74c. The insertion holes 68a and 68b formed in the holding portion 68 of the heater holder 66 are rectangular in shape to fit the base end 74c1. Therefore, the base end 74c1 fits into the insertion holes 68a and 68b, and rotation relative to the insertion holes 68a and 68b is suppressed, thereby suppressing rotation of the defrost heaters 64 and 65 about their axes.

[0032] Next, a procedure for attaching the defrost heaters 64, 65 to the heater holder 66 will be described. Of the pair of holding portions 68, 69, two protruding portions 68e, 68f of the right holding portion 68 are formed with notches 68e1, 68f1 extending downward from the lower edges of the insertion holes 68a, 68b. The protruding portions 68e, 68f are bendable along the direction in which the notches 68e1, 68f1 extend (the up-down direction), and by spreading the tips of the protruding portions 68e, 68f outward (to the right), it is possible to form openings with widths substantially the same as the inner dimensions of the insertion holes 68a, 68b in the up-down direction. Therefore, by spreading the tips of the overhanging portions 68e, 68f outward, the left ends of the defrost heaters 64, 65 can be inserted into the insertion holes 68a, 68b from the side (front) after inserting the left ends of the defrost heaters 64, 65 into the insertion holes 68a, 68b of the left-side holding portion 69. Finally, by returning the overhanging portions 68e, 68f to their original positions, the attachment of the defrost heaters 64, 65 to the heater holder 66 is completed.

[0033] The heater holder 66 to which the above-described defrost heaters 64, 65 are attached, i.e., the defrost unit 62, is fastened to the rear wall 16d of the insulating box 16 so as to be located directly below the second cooler 42, as shown in Figures 3 and 4. The two defrost heaters 64, 65 are arranged parallel to each other and aligned vertically while extending in the left-right direction. In other words, the two defrost heaters 64, 65 are aligned vertically in the direction of air flow caused by the second internal fan 60.

[0034] With this configuration, in the refrigerated storage cabinet 10 of this embodiment, the surface temperatures of the defrost heaters 64, 65 are set to a sufficiently low value so as not to reach the ignition temperature of the flammable refrigerant, but by using two defrost heaters 64, 65, it is possible to ensure a temperature sufficient to melt frost around the second cooler 42 during defrosting operation. Furthermore, although the two defrost heaters 64, 65 are arranged in the cooler chamber R4, they are arranged parallel to each other in the vertical direction of the air flow caused by the second internal fan 60. Therefore, the flow path area through which the air flows is the same as in the case of using one defrost heater, and the effect on the air flow during cooling operation can be reduced. The two defrost heaters 64, 65 are arranged as close as possible to each other so that the pressure reduction hole mark 64a of the upper defrost heater 64 does not come into contact with the lower defrost heater 65. This allows the position of the lower defrost heater 65, which is relatively far from the second cooler 42, to be as close as possible to the second cooler 42, and also reduces the amount of air flowing in between the two defrost heaters 64, 65.

[0035] A roof portion 70 of the heater holder 66 covers the two defrost heaters 64, 65 arranged vertically. The roof portion 70 has a roof shape that is highest at the center in the front-to-rear direction and slopes downward toward the front and rear. Therefore, during defrosting operation, defrost water that drops from the second cooler 42 onto the roof portion 70 flows downward along the roof portion 70. As shown in FIGS. 5 and 7 , the roof portion 70 has an opening (top opening) 70a that extends in the left-right direction at its rear end. The front edge of this opening 70a is located rearward of the rear ends of the defrost heaters 64, 65, preventing defrost water from dripping onto the defrost heaters 64, 65. As shown in Figures 3 and 4, a drain pan 76 is provided directly below the defrosting unit 62, and the defrost water is discharged from the drain pan 76 to the outside of the storage unit through a drain pipe (not shown) provided inside the rear wall 16d of the insulated box body 16.

[0036] Furthermore, during defrosting operation, opening 70a is capable of passing heat from defrost heaters 64, 65 and effectively transmitting the heat to second cooler 42. Furthermore, during cooling operation, opening 70a is capable of allowing air to flow from below to above, preventing air from stagnating inside heater holder 66 and allowing air to circulate effectively.

[0037] 5 and 6, a pair of holding portions 68, 69 of the heater holder 66 has an opening (side opening) 68c1 (illustration of the holding portion 69 is omitted) at a base portion 68c. This opening 68c1 allows air to flow from the inside to the outside of the heater holder 66 without stagnating in the area surrounded by the roof portion 70, holding portions 68, wall surface portion 67, and two defrost heaters 64, 65 of the heater holder 66. Therefore, air can be circulated effectively during cooling operation and defrosting operation.

[0038] <Other embodiments> The present invention is not limited to the above-described embodiment, and can be embodied in various forms with various modifications and improvements based on the knowledge of those skilled in the art. For example, the following embodiments are also included within the technical scope of the present invention.

[0039] The refrigerated storage 10 in the above embodiment is configured with two defrost heaters 64, 65 arranged side by side, but may have three or more.

[0040] The shape of the heater holder 66, which serves as a cover member that covers at least a portion of the two defrost heaters 64, 65 while holding them in a parallel arrangement, is not particularly limited. The heater holder 66 may have a member that holds each of the two defrost heaters 64, 65, and the members may be assembled together, or may be attached to members that form the cooler chamber.

[0041] The present invention is not limited to an upright refrigerator, but can also be applied to a horizontal refrigerator-freezer (undercounter refrigerator-freezer). Furthermore, the present invention can also be applied to a refrigerator-freezer showcase or a prefabricated refrigerator-freezer. [Explanation of symbols]

[0042] 10... Refrigerated storage cabinet, 12... Refrigerated cabinet main body, 16... Insulated box body, R3... Second storage chamber, R4... Second cooler chamber, 30... Cooling device, 42... Second cooler, 44... Refrigerant pipe, 60... Second interior fan (circulation fan), 64, 65... Defrost heater, 66... ​​Heater holder (cover member), 68... Holding portion, 68c1... Opening (side opening), 69... Holding portion, 70... Roof portion, 70a... Opening (top opening)

Claims

1. a refrigerator body having a storage chamber for storing an object to be cooled and a cooler chamber for accommodating a cooler for cooling the storage chamber; a refrigeration cycle type cooling device including the cooler and in which a flammable refrigerant circulates; a circulation fan that circulates air between the storage chamber and the cooler chamber; two or more defrost heaters, each of which is a longitudinal heater that melts frost generated by the cooler and operates at a surface temperature equal to or lower than a temperature that is lower by a set temperature than the ignition temperature of the flammable refrigerant; Equipped with The circulation fan causes air to flow vertically within the cooling chamber, The two or more defrost heaters are arranged directly below the cooler, parallel to each other and aligned in the vertical direction.

2. A cover member is provided which holds the two or more defrost heaters in a vertically aligned state and covers at least a portion of the two or more defrost heaters, The refrigerated storage container according to claim 1 , wherein the cover member has a plurality of openings extending from the inside to the outside.

3. The cover member has a roof portion that covers the two or more defrost heaters from above, The refrigerated storage facility according to claim 2 , wherein the roof portion has an upper surface opening formed therethrough in a vertical direction at a position not overlapping with the two or more defrost heaters in the vertical direction.

4. the cover member has a pair of holding portions that hold each of the two or more defrost heaters at both end portions in the longitudinal direction, The refrigerated storage facility according to claim 3 , wherein the pair of holders have side openings formed therein that penetrate in the direction in which the defrost heater extends.

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