JP7321902B2 - Cooling system - Google Patents

Description

The technology disclosed by this specification relates to a cooling device.

2. Description of the Related Art In a cooling device for cooling a storage room or the like of a refrigeration storehouse, a shift from Freon-based refrigerants to alternative refrigerants is underway in consideration of the environment. Since most alternative refrigerants are mainly composed of flammable propane, isobutane, etc., there is a risk of ignition if leaked from pipes or the like. In the vicinity of the cooling device, for example, an electrical box containing electrical components such as relay components related to operation control of the cooling device may be arranged so as to be adjacent to the condenser that constitutes the cooling device. If a flammable refrigerant penetrates into the electrical parts, the risk of an ignition accident becoming a source of ignition increases. Therefore, for example, in Cited Document 1 below, a refrigeration unit is proposed in which a shielding wall is provided between the electrical box and the condenser so as to face the side surface of the electrical box.

JP 2017-219277 A

In the refrigerating unit disclosed in Patent Document 1, in order to further suppress the intrusion of the flammable refrigerant into the electrical box and further improve safety, the side of the electrical box where the condenser is not arranged also has the It is conceivable to additionally form a shielding wall facing the side surface and cover the periphery of the electrical box with the shielding wall. However, if the electrical box is surrounded by the shielding wall in this way, the forming area of the shielding wall becomes large, which not only causes an increase in cost, but also makes it impossible to smoothly exhaust the heat from the heat-generating parts in the electrical box, resulting in an increase in the temperature of the parts. However, there is a risk that failures of electrical components may be induced.

The technology disclosed in the present specification has been completed in consideration of the above circumstances, etc., and aims to improve safety while suppressing failures of electrical components in a cooling device that uses a flammable refrigerant. aim.

The cooling device disclosed by this specification has the following configuration (1).
(1) an electrical box containing electrical components;
a refrigerant pipe containing a combustible refrigerant;
a first pedestal on which the electrical box is mounted;
A cooling device comprising: a second pedestal arranged horizontally with a gap from the first pedestal and having the refrigerant pipe disposed on the upper surface thereof,
A separation shielding wall for restricting the passage of gas is provided on the first mount side of the refrigerant pipe on the upper surface of the second mount.

In a cooling device having a configuration including a first pedestal and a second pedestal, if a flammable refrigerant leaks on the second pedestal side, the leaked flammable refrigerant It may flow towards the box. According to the above configuration, the flow of such combustible refrigerant is regulated by the separation shield wall. As a result, it is possible to reduce the possibility that the flammable coolant will reach and enter the electrical box compared to a configuration in which the isolation shielding wall is not erected. Here, the isolation shielding wall is provided on the second pedestal spaced apart from the first pedestal, and is separated from the electrical equipment box, so the shielding wall is provided in the vicinity of the electrical equipment box. Compared with the case, it becomes difficult to prevent the heat from being discharged from the electrical equipment box. As a result, the safety of the cooling device can be improved by reducing intrusion of the flammable refrigerant into the electrical component box while suppressing failure of the electrical components due to temperature rise. In addition, since the isolation/shielding wall can exert its effect with a very simple structure, it is possible to suppress an increase in cost due to the additional installation of the isolation/shielding wall.

The refrigerator disclosed by this specification may have the configuration of (2) below.
(2) In the above (1), a condenser to which the refrigerant pipe is piped is further mounted on the first frame, and the condenser is located on a side of the electrical equipment box different from the separation shield wall. A part of the refrigerant pipe is arranged in the condenser so as to be exposed to the outside, and between the condenser and the electrical equipment box, a portion of the condenser where the refrigerant pipe is exposed faces the An opposing shielding wall is provided to restrict the passage of gas so as to prevent gas from passing therethrough.

If the flammable refrigerant leaks from the condenser arranged on the same first frame as the electrical equipment box, the leaked flammable refrigerant easily enters the electrical equipment box. According to the above configuration, the facing shielding wall is provided so as to face the exposed portion of the refrigerant pipe where the flammable refrigerant is likely to leak from the condenser, and from which the flammable refrigerant is particularly likely to enter the electrical box when leaked. As a result, the amount of flammable refrigerant that enters the electrical equipment box can be greatly reduced. In this way, even when the opposing shielding wall is provided close to one surface side of the electrical box, the separating shielding wall provided on the other side of the electrical box is separated from the electrical box. The heat inside the electrical box can be discharged from the other side. As a result, it is possible to suppress the inflow of the flammable refrigerant into the electrical component box, reduce the risk of ignition accidents, and improve the safety while suppressing malfunctions of the electrical components.

The refrigerator disclosed by this specification may have the configuration of (3) below.
(3) In (1) or (2) above, the cooling device is arranged inside a machine room in which a peripheral wall is erected on the peripheral edge of the bottom wall, and the combustible refrigerant is air It is heavier, and a flow path is provided between the separation shield wall and the peripheral wall to allow the flow of gas.

A combustible refrigerant that is heavier than air moves along the upper surface of the second cradle when leaking from the second cradle side. In the configuration in which the isolation shielding wall is provided so as to contact the peripheral wall, the flammable refrigerant leaking from the second pedestal side stays in the area on the second pedestal side partitioned by the isolation shielding wall inside the machine room. As a result, regions where the concentration of the flammable refrigerant is high tend to occur. According to the above configuration, the flammable refrigerant that has moved along the upper surface of the second pedestal diffuses through the flow passage to the outer peripheral portion of the machine room and the first pedestal side, so that the flammable refrigerant is locally concentration increase is suppressed. As a result, the risk of ignition accidents is reduced, and the safety of the cooling device can be enhanced.

According to the technology disclosed in this specification, it is possible to improve the safety of a cooling device that uses a flammable refrigerant while suppressing failures of electrical components and the like.

1 is a partially cutaway front view of a cooling storage with a cooling device according to one embodiment; FIG. Partial cutaway side view of cooling storage Perspective view of the cooling device attached to the ceiling wall of the heat insulating box viewed from the upper front right Top view of the cooling device attached to the ceiling wall of the heat insulating box A side view of the cooling device attached to the ceiling wall of the heat insulating box as seen from the left A perspective view of a cooling device according to a modified example Perspective view of a cooling device according to another modification

A cooling storage R1 equipped with a cooling device 30 according to one embodiment will be described below with reference to FIGS. 1 to 5. FIG. In the following description, the front side of FIG. 1 is the front side, the right side is the right side, and the upper side is the top side. In FIG. 3, the lower left side of the paper surface is the front, the lower right side is the right side, and the upper front side of the paper surface is the top. In addition, below, with respect to a plurality of identical members, one member may be denoted by a reference numeral, and other members may be omitted.

As shown in FIG. 1, the cooling storage R1 according to the present embodiment is a six-door refrigerator in which a front-opening heat insulating box 10 is supported by legs 13 provided at the bottom, and the heat insulating box 10 It is a configuration in which a machine room 20 is provided in. The interior of the heat-insulating box 10 is a storage compartment 12. The storage compartment 12 is divided into two compartments, a freezing compartment 12F on the left and a refrigerating compartment 12R on the right, by a vertical partition wall 11 arranged on the right side. partitioned. In the following, when a structure corresponding to both the freezing compartment 12F and the refrigerating compartment 12R is included, when distinguishing between them, the former is denoted by the subscript F and the latter by the subscript R, If there is no particular distinction, they may be written without subscripts. A single vertical partition frame 14A is attached to the opening of the freezer compartment 12F formed on the left side of the heat insulating box 10 to divide the freezer compartment 12F into two rows on the left and right. A single horizontal partition frame 14B is attached so as to extend from the freezing compartment 12F to the opening of the refrigerating compartment 12R, dividing the compartment into two upper and lower stages. As a result, a total of 6 openings, ie, 3 rows×2 upper and lower stages, are formed on the front surface of the cooling storage R1, and a door 15 is attached to each opening. A space closed by four doors 15 in two columns on the left side by two steps is a freezer compartment 12F, and a space closed by two doors 15 in one column on the right side by two steps is a refrigerator compartment 12R. Inside the freezer compartment 12F and the refrigerator compartment 12R, for example, a shelf board can be provided, and stored items can be placed and stored on the shelf board.

As shown in FIGS. 1 and 2 , a machine room 20 provided above the storage room 12 is defined by a peripheral wall 21 erected on the upper surface of the heat insulating box body 10 . The peripheral wall 21 includes a front wall 21A provided along the front edge of the ceiling wall 16 of the heat insulating box 10 constituting the bottom wall of the machine room 20, and side walls 21B provided along the left and right side edges (see FIG. 1). ), and the upper surface and the rear surface of the machine room 20 are open. In addition, a part of FIG. 2 has shown the vertical cross section of the freezer compartment 12F.

As shown in FIG. 2 and the like, a cooling device 30 is arranged inside the machine room 20 . FIG. 3 is a perspective view of the cooling device 30 installed inside the machine room 20 as viewed from the upper right side (the peripheral wall 21 is omitted in the figure). As shown in FIG. 3, the cooling device 30 according to this embodiment includes a first unit 31F and a second unit 31R. The first unit 31F has a first frame (first frame) 32F and is arranged above the freezer compartment 12F. The second unit 31R has a second pedestal (second pedestal) 32R and is arranged above the refrigerator compartment 12R.

As shown in FIGS. 2 to 4, in the cooling device 30 according to the present embodiment, a condenser fan 34 (see FIG. 4 etc.) is attached to the upper surface of the first frame 32F of the first unit 31F and to the rear surface thereof. A container 35, a compressor 33, and the like are placed. On the other hand, as shown in FIGS. 3 and 4, these devices are not arranged on the upper surface of the second frame 32R of the second unit 31R, and only the refrigerant pipe 38 connected from the first unit 31F is piped. .

As shown in FIGS. 2 and 5, a first cooler 37F for cooling the inside of the freezer compartment 12F is attached to the lower surface of the first frame 32F, and a refrigerant pipe vertically passing through the first frame 32F. A compressor 33, a condenser 35, and a first cooler 37F are circulatingly connected by 38 (see FIGS. 3 to 5, etc.) to form a well-known refrigeration cycle. A flammable refrigerant heavier than air, such as propane or isobutane, is sealed in the refrigerant pipe 38 . On the other hand, although not shown in the figure, a second cooler for cooling the interior of the refrigerator compartment 12R is also attached to the lower surface of the second frame 32R of the second unit 31R. 33 and a condenser 35 are circulatingly connected to form a refrigerating cycle. The refrigerant pipe 38 includes a discharge-side refrigerant pipe through which the refrigerant discharged from the compressor 33 goes to the first cooler 37F or the second cooler, and a refrigerant pipe that passes through the first cooler 37F or the second cooler. 33 can be divided into a reflux side refrigerant pipe that is returned to 33 . Of these, the return-side refrigerant pipe through which the relatively low-temperature refrigerant is circulated is wound with a heat insulating material such as foam in order to suppress dew condensation. In a section where the discharge-side refrigerant pipe and the return-side refrigerant pipe are parallel, the discharge-side refrigerant pipe is generally inserted into the heat insulating material, and both refrigerant pipes are arranged in a state of being put together. Hereinafter, the portion of the refrigerant pipe 38 that is arranged alone without being wound with a heat insulating material may be referred to as a discharge-side refrigerant pipe 38P. As shown in FIGS. 4 and 5, the discharge-side refrigerant pipe 38P is provided with a three-way valve 39 on the first unit 31F, and the combustible refrigerant discharged from the compressor 33 and condensed in the condenser 35 is divided into the discharge-side refrigerant pipe 38P-F for the first cooler 37F and the discharge-side refrigerant pipe 38P-R for the second cooler, and circulates not only in the first cooler 37F but also in the second cooler. is configured as

As shown in FIGS. 1 and 2, window holes 17F and 17R are provided in the ceiling wall 16 of the heat insulating box 10 at substantially central positions of the ceilings of the freezing compartment 12F and the refrigerating compartment 12R. , pedestals 32F and 32R are arranged so as to close these window holes 17F and 17R from above (see FIG. 2). As shown in FIGS. 1 and 2, drain pans 18F and 18R, which also serve as cooling ducts, extend from the lower front edges (left side in FIG. 2) of the window holes 17F and 17R toward the rear wall of the insulating box 10. A first cooler chamber 40F or a second cooler chamber (not shown) is formed between the frames 32F, 32R and the drain pans 18F, 18R, respectively. When the pedestals 32F and 32R are installed so as to cover the upper surfaces of the window holes 17F and 17R, the first cooler 37F and the second cooler described above are mounted on the pedestal in the first cooler chamber 40F or the second cooler chamber. It is housed in a state of being suspended from 32F and 32R. On the rear side of the drain pans 18F and 18R, a first blowout portion 41F for blowing cold air from the first cooler chamber 40F into the freezing chamber 12F or a second blowing portion 41F for blowing cold air from the second cooler chamber into the refrigerator chamber 12R is provided. 2 outlets are formed. In front of the drain pans 18F and 18R, fans 19F and 19R driven by motors are provided. As shown in FIG. 1, the ceiling of the freezer compartment 12F, which has a large volume, is provided with a window hole 17F that is larger than the window hole 17R of the refrigerator compartment 12R, and is larger than the drain pan 18R of the refrigerator compartment 12R. A drain pan 18F with a large area is attached. One internal fan 19R is attached to the drain pan 18R of the refrigerator compartment 12R, while three internal fans 19F are attached to the drain pan 18F of the freezer compartment 12F.

During the cooling operation, the compressor 33, the internal fans 19F and 19R, and the condenser fan 34 are driven. As indicated by the arrow in FIG. 2, when the internal fan 19F is driven, the air in the freezer compartment 12F is sucked into the first cooler compartment 40F and is heat-exchanged while passing through the first cooler 37F. The generated cool air is blown into the freezer compartment 12F from the first blowout part 41F. For example, the temperature of the freezer compartment 12F is detected by an internal thermistor (not shown). When the detected temperature becomes lower than the set temperature, the compressor 33 and the internal fan 19F are stopped. , and re-driving of the compressor 33 and the internal fan 19F may be repeated to maintain the inside of the freezer compartment 12F substantially at the set temperature. The refrigerator compartment 12R can also be cooled in the same manner as the freezer compartment 12F. Note that the compressor 33 and the internal fans 19F and 19R do not necessarily need to be driven/stopped at the same time. Only one of 19R may be driven or stopped.

Here, the arrangement configuration of the cooling device 30 will be explained again. As shown in FIGS. 3 and 4, the first pedestal 32F and the second pedestal 32R are formed in flat plate shapes having substantially the same size and shape. Members having the same shape may be used for the first mount 32F and the second mount 32R. In this way, if the same member can be used for both the mounts 32F and 32R, the member cost can be suppressed and the management and the like can be simplified. In this embodiment, the lateral dimensions of the mounts 32F and 32R are approximately equal to the lateral width of the refrigerating compartment 12R formed so as to occupy about the right one-third of the heat insulating box body 10, and the longitudinal dimensions are: It is slightly smaller than the front-to-rear width of the heat insulation box 10. - 特許庁As shown in FIG. 4 and the like, the first frame 32F is arranged at the center of the freezer compartment 12F, and the second frame 32R is arranged directly above the refrigerator compartment 12R in the horizontal direction. With respect to the front-rear direction, both the mounts 32F and 32R are arranged at positions slightly behind the ceiling wall 16 with a gap therebetween in the front-rear direction.

Devices and the like installed in the first unit 31F will be described. As shown in FIGS. 3 to 5, a condenser 35 and a compressor 33 are mounted in a row on the left side of the upper surface of the first frame 32F, while the condenser 35 and the compressor 33 are arranged in the front-rear direction, as shown in FIGS. , a first cooler 37F is attached to a position closer to the rear of the lower surface of the first mount 32F. The combustible refrigerant discharged by the compressor 33 is condensed while passing through the condenser 35 . Inside the condenser 35, the discharge-side refrigerant pipe 38P, in which the flammable refrigerant is sealed, has a linear portion extending horizontally over a plurality of stages, and a U-shape on both left and right sides of the condenser 35. The bent portions 38PX are connected to the straight portions by welding, and the bent portions 38PX are exposed on both left and right side surfaces of the condenser 35 . The combustible refrigerant condensed in the condenser 35 is divided into the discharge side refrigerant pipe 38P-F and the discharge side refrigerant pipe 38P-R by the three-way valve 39 provided in the discharge side refrigerant pipe 38P, as described above. be. Out of these, the discharge side refrigerant pipe 38P-F for the first cooler 37F is inserted behind the compressor 33 into the heat insulating material of the refrigerant pipe 38 including the reflux side refrigerant pipe that flows back to the compressor 33. , and passes through a first raised portion 38YF raised on the left side of the compressor 33 in parallel with the return-side refrigerant pipe, penetrates the first frame 32F, and is connected to the first cooler 37F. After being led out from the first cooler 37F, the return-side refrigerant pipe for returning the refrigerant from the first cooler 37F passes through the first frame 32F in parallel with the discharge-side refrigerant pipe, as described above. After passing through the first rising portion 38YF, it is connected to the compressor 33 .

As shown in FIGS. 3 and 4, an electrical equipment box 51 containing electrical components such as relay components is mounted on the right side of the upper surface of the first mount 32F. The relay component is a component required to control the operation of the cooling storage R1 by relaying signals from various thermistors and the like provided in the cooling storage R1. There are no particular restrictions on the use and structure of the electrical parts and the like. On the left side of the electrical box 51, there are through holes including mounting holes for mounting components and substrates housed inside, and conduction holes for conducting lead wires connected to the parts housed inside. A plurality of holes or the like may be perforated. A regulator box 52 smaller than the electrical box 51 is placed behind the electrical box 51 and to the right of the compressor 33 . The regulator box 52 accommodates a power supply board of a gas sensor for detecting leakage of combustible refrigerant, and the like.

Devices and the like arranged in the second unit 31R will be described. As described above, in the present embodiment, except for the refrigerant pipe 38, no equipment related to the refrigeration cycle, operation control, or the like is arranged on the upper surface of the second frame 32R. As the refrigerant pipe 38, a discharge-side refrigerant pipe 38P-R for the second cooler, which is branched by the three-way valve 39 from the discharge-side refrigerant pipe 38P arranged in the first unit 31F, is arranged behind the first upright portion 38YF. 3 and 4, while the discharge-side refrigerant pipe and the return-side refrigerant pipe are parallel to each other, the ceiling wall 16 passes through the rear of the first frame 32F, and It is arranged along the rear edge so as to reach the rear left end of the second mount 32R. Then, after passing through the second raised portion 38YR raised upward at the left side of the second mount 32R and penetrating the second mount 32R, the second cooler attached to the lower surface of the second mount 32R Circularly connected.

Now, in the cooling device 30 according to the present embodiment, as shown in FIGS. 3 and 4, the passage of gas is restricted along the entire length of the side edge of the second pedestal 32R on the first pedestal 32F side, that is, the left side edge. A separation shielding wall 61 is erected. For the separation/shielding wall 61, for example, a metal plate or the like that is bent as necessary can be used. The material of the separating and shielding wall 61 is not particularly limited as long as it can regulate the passage of gas, but considering safety and the like, it is preferable to use a flame-retardant material. The isolation/shielding wall 61 according to the present embodiment has a substantially rectangular flat plate shape having substantially the same height as the second upright portion 38YR and substantially the same front-to-rear width as the second mount 32R. The separation shielding wall 61 is fixed to the second base 32R by aligning the lower edge bent to the left with the left edge of the second base 32R and screwing it. The front and rear edges are also reinforced by being bent to the left. As described above, the front-to-rear width of the second mount 32R is smaller than the front-to-rear width of the bottom wall (ceiling wall 16) of the machine room 20, and the second mount 32R, as shown in FIG. is arranged in the machine room 20 so that a gap S1 exists between the front end of the motor and the front wall 21A. The gap S1 functions as a flow path through which gas can flow, and the provision of the gap S1 in front of the separation shielding wall 61 allows the air in the machine room 20 to circulate.

Further, in the cooling device 30 according to the present embodiment, as shown in FIGS. 3 and 4, on the upper surface of the first unit 31F, between the condenser 35 and the electrical equipment box 51, there is provided a left side surface of the electrical equipment box 51. A facing shielding wall 62 is provided to regulate the passage of gas. The material of the opposing shielding wall 62 is not particularly limited as long as it can regulate the passage of gas, and can be formed of the same material as the separating shielding wall 61 . For example, a metal plate or the like that is bent as necessary can be used. The opposing shielding wall 62 according to the present embodiment has a front-to-rear width from slightly behind the rear surface of the electrical box 51 to the front edge of the first frame 32F, and a height substantially equal to that of the condenser 35 and the electrical box 51. It has a substantially rectangular plate-like vertical portion 62A, and a horizontal portion 62B in which the upper end of the vertical portion 62A is bent horizontally. The lower edge of the vertical portion 62A is bent, and the opposing shielding wall 62 is fixed to the first pedestal 32F by screwing this lower rim at an appropriate position on the upper surface of the first pedestal 32F. The front portion of the vertical portion 62A covers the entire left side surface of the electrical component box 51 with almost no gap, while the rear portion is bent from the rear end of the electrical component box 51 toward the electrical component box 51 side. . The horizontal portion 62</b>B is screwed to the upper surface of the condenser 35 and arranged to cover the bent portion 38</b>PX of the refrigerant pipe 38 exposed on the right side surface of the condenser 35 .

As described above, the cooling device 30 according to this embodiment has the following configuration, and can obtain the following effects.
An electrical box 51 housing a relay component (electrical component), a refrigerant pipe 38 containing a flammable coolant, a first frame (first frame) 32F on which the electrical box 51 is placed, and a first frame. 32F and a cooling device 30 provided with a second pedestal (second pedestal) 32R arranged horizontally with a space therebetween and having a refrigerant pipe 38 disposed on the upper surface thereof, the upper surface of the second pedestal 32R A separation shielding wall 61 is provided on the side of the first mount 32F of the refrigerant pipe 38 in , for restricting the passage of gas.

In the cooling device 30 including the first pedestal 32F and the second pedestal 32R, when the flammable refrigerant leaks on the second pedestal 32R side, the leaked inflammable refrigerant It may flow towards 51. According to the above configuration, the flow of such combustible refrigerant is regulated by the separation shield wall 61 . As a result, it is possible to reduce the possibility of the combustible refrigerant reaching and entering the electrical component box 51 as compared with a configuration in which the isolation shielding wall 61 is not erected. Here, the separation shielding wall 61 is erected on the second frame 32R spaced apart from the first frame 32F, and is spaced apart from the electrical component box 51. Therefore, the electrical component box 51 As compared with the case where the shielding wall is provided in the vicinity of the electrical equipment box 51, the heat discharge from the electrical equipment box 51 is less likely to be hindered. As a result, the safety of the cooling device 30 can be improved by reducing intrusion of the flammable refrigerant into the electrical component box 51 while suppressing failure of the electrical components due to temperature rise. Since the separating and shielding wall 61 can exert its effect with a simple structure, it is possible to suppress an increase in cost due to additional provision of this.

In the cooling device 30 according to the present embodiment, a condenser 35 having a refrigerant pipe 38 is further mounted on the first frame 32F, and the condenser 35 is located on a different side of the electrical box 51 from the isolation shielding wall 61. , the bent portion 38X (a part of the refrigerant pipe 38) is arranged to be exposed to the outside in the condenser 35, and between the condenser 35 and the electrical box 51, a portion where the bent portion 38X is exposed A facing shielding wall 62 for restricting the passage of gas is provided so as to face the .

If the flammable refrigerant leaks from the condenser 35 arranged on the same first frame 32</b>F as the electrical equipment box 51 , the leaked flammable refrigerant easily enters the electrical equipment box 51 . According to the above configuration, the combustible refrigerant is likely to leak from the condenser 35, and if it leaks, the combustible refrigerant is particularly likely to enter the electrical box 51. By providing the opposing shielding wall 62 in the electrical equipment box 51, the risk of the flammable refrigerant entering the electrical equipment box 51 can be greatly reduced. Thus, even when the opposing shielding wall 62 is provided close to one side of the electrical box 51 , the separation shielding wall 61 provided on the other side of the electrical box 51 is separated from the electrical box 51 . Therefore, the heat inside the electrical equipment box 51 can be discharged from the other side of the electrical equipment box 51 . As a result, it is possible to reduce the risk of ignition accidents by suppressing the inflow of flammable refrigerant into the electrical component box while suppressing malfunctions of the electrical parts caused by the temperature rise in the electrical component box 51, thereby improving safety. can be done. In addition, the condenser fan 34 is arranged on the first frame 32F, and even if the flammable refrigerant leaks while this is being driven, the leaked flammable refrigerant is diffused by convection. , the possibility that it stays on the first pedestal 32</b>F and becomes partially high in concentration or flows into the electrical equipment box 51 becomes relatively low. That is, the opposing shielding wall 62 functions particularly effectively in the cooling device 30 configured such that the condenser fan 34 is stopped as appropriate.

The cooling device 30 according to this embodiment is arranged inside a machine room 20 in which a peripheral wall 21 is erected on the peripheral edge of the bottom wall. Between 61 and front wall 21A (peripheral wall 21), a gap (flow path) S1 is provided to allow gas to flow.

A combustible refrigerant that is heavier than air moves along the upper surface of the second mount 32R when leaked from the second mount 32R side. In the configuration in which the separation shielding wall 61 is provided so as to abut on the peripheral wall 21, the flammable refrigerant leaking from the second pedestal 32R side flows into the second pedestal 32R side partitioned by the separation shielding wall 61 inside the machine room 20. Since the refrigerant stays in the region, a portion where the concentration of the flammable refrigerant is high tends to occur. According to the above configuration, the combustible refrigerant that has moved along the upper surface of the second mount 32R diffuses and circulates to the outer peripheral portion of the machine room 20 and the first mount 32F through the gap S1. local concentration increase is suppressed. As a result, the risk of ignition accidents is reduced, and the safety of the cooling device 30 can be enhanced.

<Other embodiments>
The technology disclosed in this specification is not limited to the embodiments described in the above description and drawings, and includes the following embodiments, for example.

(1) In the above embodiment, the separation shielding wall is erected along the entire length of one side edge of the second pedestal, but the present invention is not limited to this. The isolation shielding wall may also be provided on the other side of the refrigerant pipe arranged on the second pedestal. Specifically, as shown in the modification of FIG. 6, in a cooling device 230 that includes a first unit 31F and a second unit 231R, the left edge of the second pedestal 32R (side edge on the first pedestal 32F side) A separation shielding wall 261 comprising a side surface portion 261A standing along the edge of the second mount 32R, a front surface portion 261B standing along the front edge, and a rear surface portion 261C standing along the rear edge is provided. It is conceivable to surround the upper surface from three sides. In this case, the flammable refrigerant that has leaked from the second frame 32R side may be allowed to flow outside through a ventilation opening or the like provided on the right side wall of the machine room. Alternatively, it may be provided only on the first gantry side of the portion where the flammable refrigerant is likely to leak. For example, the second upright portion 38YR is formed by welding a plurality of pipes that constitute the refrigerant pipe 38, and is a portion that has a relatively high risk of leaking flammable refrigerant due to cracks or the like occurring in the welded portion. I can say Specifically, as shown in another modification of FIG. 7, in a cooling device 330 that includes a first unit 31F and a second unit 331R, the second standing portion of the refrigerant pipes 38 arranged on the second base 32R Along a part of the left edge of the second mount 32R (side edge on the first mount 32F side) of the second mount 32R so as to surround the welded part of the upper part 38YR from three sides, the side part 361A is extended in front of the second upright part 38YR. 361B may be erected behind 361C to form the isolation shielding wall 361 . It should be noted that the cooling devices 230 and 330 have the same configuration as the cooling device 30 described in the embodiment, except for the isolation shielding walls 261 and 361 .

(2) In the above embodiment, the separating and shielding wall has a flat plate-like general shape, but the present invention is not limited to this. As with the separation/shielding walls 261 and 361 described above, a separation/shielding wall may be configured by combining a plurality of flat plate members. Also, the separation/shielding wall may be partially or wholly curved or provided with irregularities.

(3) In the above embodiment, the machine room in which the peripheral walls are erected on the left and right side edges and the front edge of the bottom wall is described, but the present invention is not limited to this. For example, a peripheral wall may also be erected on the rear edge of the bottom wall so that the four sides of the machine room are surrounded by the peripheral wall. Especially in such a case, from the viewpoint of circulating the air in the machine room, it is desirable to provide a plurality of flow passages (gap) in front and back of the separation shield wall, etc., but only one flow passage is provided. The effect of diffusing the flammable refrigerant can be obtained only by this.

(4) In the above-described embodiment, the separating shielding wall and the vertical portion of the opposing shielding wall are arranged to extend substantially in the front-rear direction on the left and right sides of the electrical box. has been described, but is not limited to such. For example, in the first frame, the condenser and the like may be placed on the front side and the electrical box may be placed on the rear side, and the opposing shielding wall may be provided between them so as to extend in the left-right direction. In this case, the flammable refrigerant leaking from the condenser may be discharged from a ventilation opening or the like provided on the front wall of the machine room. Alternatively, a condenser or the like may be arranged on the rear side so that the combustible refrigerant can easily flow out from the rear surface of the machine chamber.

(5) In the above embodiment, the cooling device is provided with two pedestals, the first pedestal 32F and the second pedestal 32R. good. Moreover, in the above-described embodiment, the case where the compressor and the condenser are not arranged on the second frame has been described, but the present invention is not limited to such a case. The present technology can also be applied to a cooling device having a configuration in which a compressor, a condenser, and the like are arranged not only on the first frame but also on the second frame.

(6) In the above embodiment, the cooling device used for a six-door refrigerator-freezer was described, but the present invention is not limited to such a device. The cooling device according to the present technology includes multiple pedestals and is suitable for use in a refrigerator with multiple storage compartments cooled to different temperatures, but a refrigerator with a single storage compartment , a refrigerator or the like in which a plurality of storage compartments are cooled to the same set temperature.

R1... Cooling storage, 10... Thermal insulation box, 12F... Freezing compartment, 12R... Cold storage room, 16... Ceiling wall, 20... Machine room, 21... Surrounding wall, 21A... Front wall, 21B... Side wall, 30, 230, 330... cooling device, 31F... first unit, 31R... second unit, 32F... first mount (first mount), 32R... second mount (second mount), 33... compressor, 34... condenser fan, 35... Condenser, 37F... First cooler, 38... Refrigerant pipe, 38PX... Bent portion, 38YF... First rising portion, 38YR... Second rising portion, 39... Three-way valve, 51... Electrical box, 61, 261, 361... Separating shielding wall, 62... Countering shielding wall, S1... Gap (flow path)

Claims (2)

an electrical box containing electrical components;
a refrigerant pipe containing a combustible refrigerant;
a first pedestal on which the electrical box is mounted;
A cooling device comprising: a second pedestal arranged horizontally with a gap from the first pedestal and having the refrigerant pipe disposed on the upper surface thereof,
On the upper surface of the second pedestal, a separation shielding wall for regulating the passage of gas is erected on the first pedestal side of the refrigerant pipe ,
A condenser to which the refrigerant pipe is piped is further mounted on the first pedestal,
the condenser is arranged on a side different from the separation shield wall with respect to the electrical box;
A part of the refrigerant pipe is arranged in the condenser so as to be exposed to the outside,
A cooling device according to claim 1, wherein an opposing shielding wall is formed between the condenser and the electrical box so as to oppose a portion of the condenser where the refrigerant pipe is exposed. The cooling device is arranged inside a machine room in which a peripheral wall is erected on the peripheral edge of the bottom wall,
The combustible refrigerant is heavier than air,
2. The cooling device according to claim 1, wherein a flow path for allowing gas to flow is provided between said separation shield wall and said peripheral wall.

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