Cooling storage

Abstract

To realize a cooling storage including a bolt which is excellent in heat insulation.SOLUTION: A cooling storage 10 includes: a storage body 11 having a bolt 20 inserted into a through hole 12S of a heat insulation wall 12; and a cooling device 15. The bolt 20 has: a metal bolt body 30 having an axial part 31 to be inserted into the through hole 12S, and a head 32 which is not inserted into the through hole 12S and is disposed at one side of the heat insulation wall 12; and a resin cap 40 which surrounds and covers the head 32 of the bolt body 30. The cap 40 includes: a base part 41 disposed between the heat insulation wall 12 and the head 32 of the bolt body 30 and having an insertion port 41A1 of the axial part 31; a cap body part 42 configured to form an internal space 40S which houses the head 32 with the base part 41; and a filler 43 for filling the internal space 40S. The cap body part 42 has: an injection port 42B for injecting the filler 43 into the internal space 40S; and a lid part 42C for opening or closing the injection port 42B.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present technology relates to a cooling refrigerator.

Background Art

[0002] Conventionally, in order to attach components to a heat insulating wall which is a wall of a cooling refrigerator, it is known that a metal bolt penetrating the heat insulating wall is used, and an example thereof is described in Patent Document 1. The bolt described in Patent Document 1 has a synthetic resin cap covering the head disposed outside the refrigerator. Air insulation is realized by the internal space formed by the cap, and the head of the bolt is blocked from the outside air. Thereby, it is said that it is possible to suppress a situation in which condensation occurs on the bolt or the mounting components, or corrosion occurs due to the condensation.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, even if the internal space of the above-described cap is formed, the heat insulation is insufficient, and condensation may occur on the head of the bolt or the mounting components. For example, when the outside air temperature is high and the temperature inside the refrigerator is a freezing temperature sufficiently lower than zero degree, the temperature difference between the inside and outside of the refrigerator becomes large, and condensation is likely to occur.

[0005] The present technology has been completed based on the above circumstances, and an object thereof is to realize a cooling refrigerator provided with a bolt having excellent heat insulation properties.

Means for Solving the Problems

[0006] To solve the above problems, the cooling refrigerator according to the present technology includes a refrigerator body having a heat insulating wall with a through hole and a bolt inserted through the through hole, and a cooling device for cooling the inside of the refrigerator body. The bolt includes a metal bolt body having a central shaft portion inserted through the through hole and a head portion disposed on one side of the heat insulating wall without being inserted through the through hole, and a resin cap that surrounds and covers the head portion of the bolt body. The cap is disposed between the heat insulating wall and the head portion of the bolt body, and includes a base portion having an insertion port for the central shaft portion, a cap body portion that forms an internal space for accommodating the head portion between the base portion, and a filling material filled in the internal space. The cap body portion has an injection port for injecting the filling material into the internal space and a lid portion for opening and closing the injection port.

[0007] Further, a part of the lid portion is constituted by an outer peripheral edge portion of the cap body portion. The outer peripheral edge portion of the cap body portion serving as the lid portion is provided with a protrusion and a recess in which the outer peripheral edge portion is recessed toward the central shaft portion side. A fitting groove into which the protrusion is fitted may be provided in the base portion.

[0008] The heat insulating wall has two metal plate materials and a heat insulating material embedded between the plate materials. The base portion of the bolt projects along the axial direction of the central shaft portion from the opening edge portion of the insertion port and has a protruding portion interposed between the central shaft portion and the opening edge portion of the through hole of the heat insulating wall. The protruding length of the protruding portion may be equal to or greater than the plate thickness of the plate material disposed on the head portion side of the bolt body.

[0009] In order to solve the above problems, a cooling refrigerator according to the present technology includes a refrigerator body having a heat insulation wall with a through-hole and a bolt inserted through the through-hole, and a cooling device for cooling the inside of the refrigerator body. The bolt includes a metal bolt body having a central axis portion inserted through the through-hole and a head portion disposed on one side of the heat insulation wall without being inserted through the through-hole, and a resin cap surrounding and covering the head portion of the bolt body. The cap is disposed between the heat insulation wall and the head portion of the bolt body, and includes a base portion having an insertion port for the central axis portion and a cap body portion forming an internal space for accommodating the head portion between the base portion. The cap body portion has a guide groove serving as an index when forming an injection port for injecting a filler into the internal space.

Advantages of the Invention

[0010] According to the present technology, a cooling refrigerator provided with a bolt having excellent heat insulation properties can be realized.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Best Mode for Carrying Out the Invention

[0012] <Embodiment 1> As a prefabricated cooling storage refrigerator according to Embodiment 1, a prefabricated cooling storage refrigerator 10 will be described with reference to FIGS. 1 to 11. FIGS. 2 to 11 show the X-axis, Y-axis, and Z-axis, and are drawn so that the axial directions are common directions in each figure. Also, the +Z direction corresponds to the inside of the storage compartment, and the -Z direction corresponds to the outside of the storage compartment.

[0013] As shown in FIG. 1, the cooling storage refrigerator 10 generally includes a storage compartment main body 11, a cooling device 15 for cooling the inside of the storage compartment main body 11 (hereinafter sometimes referred to as the inside of the storage compartment), a control device 16, and an operation unit 18. The cooling device 15 is composed of devices constituting a known refrigeration cycle. For example, an indoor unit (cooler) 15A arranged inside the storage compartment and an outdoor unit 15B (compressor, condenser, etc.) arranged outside the storage compartment are connected by a refrigerant pipe. The control device 16 includes, for example, a microcomputer and a memory, and controls the operation of the cooling storage refrigerator 10. The operation unit 18 is provided for changing various settings of the cooling storage refrigerator 10 or selecting an operation mode by the operation of the user.

[0014] The storage compartment main body 11 is a heat-insulating box body in which a heat-insulating wall 12 is assembled in a box shape, and has a front opening 13 as shown in FIG. 2. The storage compartment main body 11 includes a slide door 14 for opening and closing the front opening 13, and a door rail member 19 provided at the opening edge of the front opening 13 in the heat-insulating wall 12. As shown in FIG. 2, the heat-insulating wall 12 has a configuration in which a heat-insulating material 12C is arranged between opposing inner plate 12A and outer plate 12B. The inner plate 12A and the outer plate 12B are plate materials made of stainless steel plate (an example of a metal). The inner plate 12A is arranged on the inside of the storage compartment, and the outer plate 12B is arranged on the outside of the storage compartment. The heat-insulating wall 12 has a through-hole 12S extending in the thickness direction.

[0015] In addition, as shown in FIG. 2, the storage body 11 is provided with bolts 20 inserted through the through holes 12S for attaching the door rail members 19 to the heat insulating wall 12. As shown in FIGS. 3 to 4, the bolt 20 includes a metal bolt body 30, a resin cap 40, a fastener (screw) 51, and an O-ring 52.

[0016] The bolt body 30 has a central axis portion 31 inserted through the through hole 12S, and a head portion 32 and a flange portion 33 arranged on the inner side of the heat insulating wall 12 of the storage. The outer diameter of the central axis portion 31 is slightly smaller than the inner diameter of the through hole 12S, and the axial length is larger than the length of the through hole 12S (the thickness of the heat insulating wall 12). The end portion of the central axis portion 31 on the outer side of the storage is engaged (threaded) with a nut 55 arranged on the outer side of the heat insulating wall 12 (FIG. 2). The head portion 32 has a larger outer diameter than the central axis portion 31 and is a portion provided at the end portion of the bolt body 30 on the inner side of the storage. In this embodiment, the head portion 32 has a hexagonal shape in plan view, but other planar shapes may be used.

[0017] The flange portion 33 is provided for fixing the bolt body 30 to the heat insulating wall 12. The flange portion 33 has a plate shape with an outer diameter larger than that of the head portion 32, and is integrated (strongly joined by caulking or welding, etc.) with the central axis portion 31 and the head portion 32 so as to rotate together with the central axis portion 31 and the head portion 32. In this embodiment, the flange portion 33 has a circular shape in plan view, but other planar shapes may be used. The flange portion 33 has a first fixing hole 33A. The fastener 51 is fixed to the heat insulating wall 12 through the first fixing hole 33A and a second fixing hole 41E described later. The fastener 51 is not limited to a screw and may be a nail or the like. Note that the fastener 51 is schematically shown as a side view in each cross-sectional view.

[0018] The cap 40 is disposed on the inner side of the heat insulation wall 12 of the storage compartment and surrounds and covers the head 32 and the flange portion 33 of the bolt body 30. The cap 40 includes a base portion 41, a cap main body portion 42 disposed on the inner side of the storage compartment with respect to the base portion 41 and forming an internal space 40S therebetween, and a filling material 43 filled in the internal space 40S. The base portion 41 and the cap main body portion 42 are formed separately, for example, by injection molding a relatively soft resin material. The filling material 43 is, for example, a silicone caulking material. Note that FIGS. 4, 5, and 8 show the state before the filling material 43 is injected.

[0019] The cap main body portion 42 has an umbrella shape as a whole, and its outer peripheral edge portion 42A engages with the base portion 41 from the inner side of the storage compartment. More specifically, as shown in FIG. 6, a protrusion 42D is formed on the outer peripheral edge portion 42A of the cap main body portion 42, and this protrusion 42D engages (fits) with a fitting groove 41B of the base portion 41 described later. The protrusion 42D protrudes outward (opposite to the central shaft portion 31) along the radial direction intersecting the axial direction from the outer peripheral edge portion 42A.

[0020] Further, as shown in FIG. 8, the cap main body portion 42 has an injection port 42B and a lid portion 42C for opening and closing the injection port 42B. The injection port 42B is an opening for injecting the filling material 43 into the internal space 40S.

[0021] The injection port 42B and the lid portion 42C according to the present embodiment can be easily formed by an operator when the cooling storage 10 is installed. More specifically, as shown in FIG. 9, a guide groove 47 serving as an index is formed on the inner surface (the surface on the side of the bolt body 30) of the cap main body portion 42 when forming the injection port 42B and the lid portion 42C.

[0022] The guide groove 47 according to the present embodiment has a U-shaped (U-shaped) configuration in a plan view, and the injection port 42B and the lid portion 42C are provided on the outer peripheral edge portion 42A side of the cap main body portion 42. The lid portion 42C is provided by an operator forming two cuts 48 from the outer peripheral edge portion 42A along the guide groove 47 using a tool such as nippers, and forming a folding line 49 along the guide groove 47 so as to connect the ends of the cuts 48. When the lid portion 42C is pulled up and opened, the folding line 49 is easily formed starting from the guide groove 47, and the exposed opening becomes the injection port 42B.

[0023] By providing the guide groove 47, the injection port 42B and the lid portion 42C can be easily formed, so that it is possible to select whether or not to form them according to the assumed usage situation of the cooling refrigerator 10. For example, when it is assumed that it will be used in a situation where the temperature difference between the inside and outside of the refrigerator is relatively small considering the set temperature inside the refrigerator and the outside air temperature, the bolt 20 does not require high heat insulation, and the filling material 43, as well as the injection port 42B and the lid portion 42C for filling it, may not be necessary. Since the injection port 42B and the lid portion 42C can be easily formed by the guide groove 47, the specifications during the manufacture of the cap main body portion 42 can be made common regardless of whether the filling material 43 is injected or not. As a result, the costs related to the manufacture and management of the cap main body portion 42 can be reduced.

[0024] As described above, one side portion of the lid portion 42C is configured by a part of the outer peripheral edge portion 42A of the cap main body portion 42. In addition to the protrusion 42D described above, a recess 42E into which a tool (for example, the tip of a minus driver) can be inserted from the outside is formed in the outer peripheral edge portion 42A of the cap main body portion 42 that becomes the lid portion 42C. The recess 42E is a portion where the outer peripheral edge portion 42A of the cap main body portion 42 that becomes the lid portion 42C is recessed inward (toward the central axis portion 31 side) (see FIG. 7).

[0025] By inserting a tool from the outside into the recess 42E, the lid portion 42C can be easily opened. Further, as will be described later, the lid portion 42C is closed after the filling material 43 is injected into the internal space 40S. However, even when the cap main body portion 42 is removed from the base portion 41 after the injection of the filling material 43, it becomes easier to remove by inserting a tool from the outside into the recess 42E.

[0026] On the other hand, when closing the lid portion 42C, by fitting the protrusion 42D into the fitting groove 41B of the base portion 41, the lid portion 42C can be surely closed and the closed state can be maintained. Therefore, it is preferable that both the protrusion 42D and the recess 42E are formed on the outer peripheral edge portion 42A of the cap main body portion 42 that becomes the lid portion 42C. In other words, as shown in FIGS. 8 and 9, the width W42E of the recess 42E is preferably smaller than the width W42C of the lid portion 42C (that is, the interval between the two cuts 48 formed on the outer peripheral edge portion 42A).

[0027] As shown in FIGS. 3 to 5 and FIG. 10, the base portion 41 has a circular shallow dish shape, and the planar size is larger than that of the flange portion 33 of the bolt body 30. The base portion 41 is interposed between the head portion 32 and the heat insulating wall 12, more specifically, between the flange portion 33 and the heat insulating wall 12. By the base portion 41, the inner plate 12A of the heat insulating wall 12 and the inner side portion of the bolt body 30 (specifically, the flange portion 33) do not come into contact with each other.

[0028] The base portion 41 has a bottom portion 41A, a fitting groove 41B that fits with the cap main body portion 42, a protruding portion 41C, and a relief groove 41D. The bottom portion 41A is a portion that is shallowly recessed following the shape and size of the flange portion 33 so that the flange portion 33 is installed. An insertion port 41A1 is formed at the center of the bottom portion 41A, and the central axis portion 31 of the bolt body 30 is inserted into the insertion port 41A1. A second fixing hole 41E is formed at a position overlapping the first fixing hole 33A in the bottom portion 41A, and a fastener 51 is inserted through the second fixing hole 41E.

[0029] In the base portion 41, at the portion rising from the bottom portion 41A, the outer peripheral edge portion 42A of the cap main body portion 42 is installed. As shown in FIG. 6, the fitting groove 41B of the base portion 41 is formed in a shape and size that fits with the protrusion 42D of the cap main body portion 42. The fitting groove 41B is formed along the entire circumference of the outer peripheral edge portion 42A of the cap main body portion 42. By fitting the protrusion 42D into the fitting groove 41B, the cap main body portion 42 is fixed to the base portion 41. Since the protrusion 42D and the fitting groove 41B are part of resin members (cap main body portion 42, base portion 41), they have flexibility and can be easily fitted together. The inner surface of the outer peripheral edge portion of the base portion 41 on the inner side of the housing has a gentle curved surface following the umbrella-shaped cap main body portion 42.

[0030] As shown in FIGS. 10 and 11, the protruding portion 41C is a cylindrical portion protruding axially outward (opposite to the cap main body portion 42) from the opening edge of the insertion port 41A1. The wall thickness (thickness in the radial direction) of the cylindrical protruding portion 41C is preferably thin, for example, 1 mm. The protruding portion 41C according to the present embodiment is slightly inclined so as to approach the central axis portion 31 of the bolt body 30 toward the protruding end. Thereby, the protruding portion 41C is easily inserted into the insertion port 41A1. The protruding length T41C of the protruding portion 41C is equal to or greater than the plate thickness T12A (for example, 1 mm) of the inner plate 12A, and the protruding portion 41C is interposed between the central axis portion 31 of the bolt body 30 and the opening edge of the through hole 12S of the heat insulating wall 12. Thereby, the central axis portion 31 of the bolt body 30 does not contact the inner plate 12A, and heat conduction between the inner plate 12A and the bolt body 30 can be more reliably suppressed.

[0031] As shown in FIGS. 3, 4, and 10, the knockout groove 41D is a groove provided along the outer peripheral edge on the outer surface of the base portion 41 outside the case. By providing the knockout groove 41D, sink marks (surface depressions) generated during the manufacture of the base portion 41 can be suppressed, and the raw material cost can be reduced. Further, by disposing the O-ring 52 in the knockout groove 41D, it is possible to suppress a situation in which moisture or cold air enters the outer surface of the base portion 41 outside the case and causes freezing expansion or the like. The knockout groove 41D and the O-ring 52 are preferably provided on the outer peripheral edge side (opposite side to the central axis portion 31) from the bottom portion 41A. Thereby, the O-ring 52 is not pressed by the flange portion 33 of the bolt body 30 installed on the bottom portion 41A, and the gap between the inner surface of the base portion 41 inside the case and the inner plate 12A can be minimized as much as possible.

[0032] Next, the method of fixing the above-described bolt 20 to the heat insulating wall 12 will be described. First, the O-ring 52 is fitted into the knockout groove 41D of the base portion 41 of the cap 40, and the protruding portion 41C of the base portion 41 is inserted into the through-hole 12S of the heat insulating wall 12 from inside the case. Next, the central axis portion 31 of the bolt body 30 is inserted into the insertion port 41A1 of the base portion 41 and the through-hole 12S of the heat insulating wall from inside the case. At this time, the first fixing hole 33A of the bolt body 30 is arranged so as to overlap with the second fixing hole 41E of the base portion 41. In this state, the bolt body 30 and the base portion 41 are fixed to the heat insulating wall 12 by the fastener 51, and the central axis portion 31 of the bolt body 30 is fixed with a nut 55 (FIG. 2). The fastener 51 properly engages the nut 55 and the bolt body 30 without idling. Further, since the flange portion 33 presses the bottom portion 41A of the base portion 41, the base portion 41 is pressed against the heat insulating material 12. As a result, the bolt body 30 and the base 41 can be firmly fixed to the heat insulating wall 12.

[0033] Subsequently, as described above, by forming the cut 48 and the folding line 49 along the guide groove 47 of the cap main body 42, the injection port 42B and the lid portion 42C are formed. Then, the cap main body 42 is engaged with the base portion 41, and the head 32 and the flange portion 33 of the bolt main body 30 are accommodated in the internal space 40S of the cap 40. In this state, the lid portion 42C of the cap main body 42 is opened, and the filling material 43 is injected from the injection port 42B. After the injection, when the lid portion 42C is closed, the head 32 and the flange portion 33 of the bolt main body 30 will be embedded in the filling material 43.

[0034] According to the above-described bolt 20, the filling material 43 can be injected into the internal space 40S of the cap 40 from the injection port 42B of the cap main body 42, and the heat insulation property of the internal space 40S can be improved. As a result, condensation generated on the outer portion of the bolt main body 30 accommodated in the internal space 40S outside the warehouse can be suppressed. More specifically, since the bolt main body 30 is made of metal and has a high thermal conductivity, when the inside of the warehouse is cooled, the bolt main body 30 is also cooled, and condensation is likely to occur on the outer portion in contact with the warm air outside the warehouse. However, by being embedded in the filling material 43, it is thermally insulated from the warm air outside the warehouse, and such condensation can be effectively suppressed. As a result, a bolt 20 with excellent heat insulation and a cooling storage 10 equipped with the same can be realized.

[0035] In addition, by providing the lid portion 42C on the cap main body 42, it becomes difficult for the injection port 42B to be conspicuous from the outside. As a result, by providing the injection port 42B for injecting the filling material 43, it is possible to suppress the situation where the design of the appearance of the bolt 20 deteriorates.

[0036] If the injection port 42B is not provided and the filling material 43 is directly applied to the bolt main body 30 installed on the base portion 41, there is a concern that if the amount of the filling material 43 is too much, the filling material 43 will leak out of the cap 40 when the cap main body 42 is engaged with the base portion 41. Also, if the amount of the filling material 43 is insufficient, there is a concern that the internal space 40S cannot be sufficiently filled and the heat insulation effect cannot be obtained. In that regard, according to the injection port 42B and the lid portion 42C of the present embodiment, it is possible to fill an appropriate amount of the filling material 43 with good workability while suppressing the deterioration of the design of the appearance.

[0037] <Other Embodiments> The present technology is not limited to the embodiments described by the above description and drawings. For example, the following embodiments are also included in the technical scope of the present technology.

[0038] (1) The component supported by the bolt 20 is not limited to the door rail member 19. For example, it may be a ceiling reinforcing beam member or the indoor unit 15A of the cooling device 15.

[0039] (2) In the above, the case where the head 32 and the flange portion 33 of the bolt body 30 and the cap 40 are arranged inside the storage and the tip of the central axis portion 31 of the bolt body 30 is arranged outside the storage was described. However, the bolt 20 may be attached such that the head 32 and the flange portion 33 of the bolt body 30 and the cap 40 are arranged outside the storage and the tip of the central axis portion 31 of the bolt body 30 is arranged inside the storage. In the former case, it is suitable when the workability is good when attaching the bolt 20 from the inside of the storage (for example, when it is difficult to attach from the outside of the storage due to the door rail member 19, the ceiling reinforcing beam member, etc.), and the designability can be improved because the bolt body 30 is not visible when viewing the bolt 20 from inside the storage. On the other hand, in the latter case, it is suitable when the workability is good when attaching the bolt 20 from the outside of the storage (for example, when the operator climbs on the ceiling wall and attaches the indoor unit 15A of the cooling device 15 from the outside of the storage). In this case, although the bolt body 30 is visible when viewing the bolt 20 from inside the storage, since the indoor unit 15A is made of metal, there is no significant obstacle to the designability.

[0040] (3) The injection port 42B and the lid portion 42C of the cap main body portion 42 may be provided at positions other than the outer peripheral edge portion 42A side of the cap main body portion 42. Furthermore, the lid portion 42C may be provided separately from the cap main body portion 42 so as to be separable.

[0041] (4) When separately using anti-rotation members such as the seat plate 5 and washers described in Patent Document 1, the flange portion 33 may be provided separately from the bolt body 30. In that case, it is preferable that the separate flange portion has an insertion port for the central axis portion 31 of the bolt 20.

[0042] (5) The overall shape of the cap 40 may be, for example, elliptical or rectangular in plan view as long as it can cover the outside portion of the bolt body 30 outside the housing. As shown in the drawing, making it circular in plan view is preferable because there is no anisotropy in the appearance design and there are no restrictions on the mounting direction.

Explanation of Reference Numerals

[0043] 10: Cooling storage cabinet, 11: Storage cabinet body, 12: Heat insulation wall, 12A: Inner plate (plate material), 12B: Outer plate (plate material), 12C: Heat insulating material, 12S: Through hole, 15: Cooling device, 20: Bolt, 30: Bolt body, 31: Central axis portion, 32: Head portion, 40: Cap, 41: Base portion, 41A1: Insertion port, 41B: Fitting groove, 41C: Protrusion, 42: Cap main body portion, 42A: Outer peripheral edge portion, 42B: Injection port, 42C: Cover portion, 42D: Protrusion, 42E: Recess, 43: Filling material, 47: Guide groove

Claims

1. A storage body having a heat-insulating wall with a through-hole and a bolt inserted through the through-hole, and a cooling device for cooling the interior of the storage body. The bolt has a metal bolt body having a central shaft portion inserted through the through-hole and a head portion disposed on one side of the heat-insulating wall without being inserted through the through-hole, and a resin cap that surrounds and covers the head portion of the bolt body. The cap is disposed between the heat-insulating wall and the head portion of the bolt body, and has a base portion having an insertion port for the central shaft portion, a cap body portion that forms an internal space for accommodating the head portion between the cap body portion and the base portion, and a filler filled in the internal space. The cap body portion has an injection port for injecting the filler into the internal space, and a lid portion for opening and closing the injection port. A cooling storage.

2. A part of the lid portion is constituted by an outer peripheral edge portion of the cap body portion, and the outer peripheral edge portion of the cap body portion serving as the lid portion is provided with a protrusion and a recess in which the outer peripheral edge portion is recessed toward the central shaft portion side, The cooling storage according to claim 1, wherein the base portion is provided with a fitting groove into which the protrusion is fitted.

3. The heat-insulating wall has two metal plate members and a heat-insulating material embedded between the plate members, the base portion of the bolt projects along the axial direction of the central shaft portion from the opening edge portion of the insertion port and has a protruding portion interposed between the central shaft portion and the opening edge portion of the through-hole of the heat-insulating wall, The cooling storage according to claim 1 or 2, wherein the protruding length of the protruding portion is equal to or greater than the plate thickness of the plate member disposed on the head portion side of the bolt body.

4. A storage body having a heat-insulating wall with a through-hole and a bolt inserted through the through-hole, and a cooling device for cooling the interior of the storage body. The bolt has a metal bolt body having a central shaft portion inserted through the through-hole and a head portion disposed on one side of the heat-insulating wall without being inserted through the through-hole, and a resin cap that surrounds and covers the head portion of the bolt body. The cap is disposed between the heat-insulating wall and the head portion of the bolt body, and has a base portion having an insertion port for the central shaft portion, and a cap body portion that forms an internal space for accommodating the head portion between the cap body portion and the base portion. The cap body portion has a guide groove serving as an index when forming an injection port for injecting a filler into the internal space. A cooling storage.

Images