JP2018048770A - Low Temperature Storage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low temperature storage capable of eliminating the inconvenience of the refrigerant staying in the refrigerator and realizing safe use even when the refrigerant having a risk of flammability or slight flammability leaks. With the goal. In order to achieve this object, in the low temperature storage of the present invention, an opening of a storage chamber is closed by a sliding door that can be opened and closed, and the storage chamber is cooled by using a flammable or slightly flammable refrigerant. It is cooled by an apparatus and includes a refrigerant leak detecting means for detecting a flammable or slightly flammable refrigerant leaked into the storage chamber and a door opening means for opening the sliding door, and the door opening means is provided. It has a solenoid that linearly moves the movable iron core based on the refrigerant leak detection of the refrigerant leak detecting means, and a link member that converts the linear motion of the movable iron core into a motion in the opening direction of the sliding door. [Selection diagram] Fig. 1

Description

  The present invention relates to a low-temperature storage in which the interior is closed by a sliding door and cools the interior using a slightly flammable or combustible refrigerant.

  Conventionally, refrigerants are used in low-temperature storages disposed in stores such as convenience stores and supermarkets in order to maintain the interior at a predetermined cooling temperature. At this time, a specific chlorofluorocarbon refrigerant such as R22 or an alternative chlorofluorocarbon refrigerant such as R404A has been used as the refrigerant. However, although the alternative chlorofluorocarbon refrigerant has an ozone depletion coefficient of 0, it has a high global warming potential (GWP). Therefore, from the viewpoint of preventing global warming, in recent years, natural refrigerants such as carbon dioxide, ammonia, and hydrocarbons, low GWP fluorine-containing refrigerants, and the like have been used. However, among natural refrigerants, hydrocarbons are flammable refrigerants, and low GWP refrigerants are often slightly flammable refrigerants, as exemplified by hydrofluoroolefins (HFO). Therefore, safety management is important when using these flammable or slightly flammable risks.

  For example, Patent Document 1 discloses an electric refrigerator that can safely stop the system when a gas leak occurs in an electric refrigerator that uses a hydrocarbon-based gas or a gas having an explosion risk as a refrigerant. It is disclosed. Specifically, the electric refrigerator described in Patent Document 1 has a refrigerant cycle composed of a compressor, a condenser, a capillary tube, and an evaporator, and also has a hydrocarbon-based or similar explosion risk gas. In an electric refrigerator that uses as a refrigerant, the presence or absence of gas leakage is determined from an external sensor that is installed in the refrigeration cycle and detects gas leakage, an output value from the external sensor, and a value that is preset and stored. A determination unit; and a control unit that shuts off the power source of the electric refrigerator and stops the system when the determination unit determines that a gas leak has occurred.

  As a result, in the electric refrigerator disclosed in Patent Document 1, gas leakage is detected by an external sensor installed in the refrigeration cycle, and the determination unit determines that the gas has leaked, and the control unit stops the system. Was prevented from igniting and exploding.

JP-A-9-14811

  However, in Patent Document 1, when the electric refrigerator is configured by closing the interior with a door, the interior becomes a sealed space, so even if the system is stopped, the combustible leaked inside The refrigerant having the risk of property or slight flammability will stay in the sealed space and may exceed the minimum flammability level.

  Therefore, the market demands the development of a low-temperature storage that can be used safely, avoiding the inconvenience of refrigerant stagnation even if flammable or slightly flammable refrigerant leaks. It has been.

  Therefore, the present inventors have devised a low-temperature storage that can eliminate the inconvenience that the refrigerant stays in the warehouse even if the refrigerant having the risk of flammability or slight flammability leaks. It came to offer.

  That is, the low-temperature storage according to the present invention closes the opening of the storage chamber with a sliding door that can be freely opened and closed, and cools the storage chamber with a cooling device using a flammable or slightly flammable refrigerant. A refrigerant leak detecting means for detecting a combustible or slightly flammable refrigerant leaked into the storage chamber, and a door opening means for opening the sliding door, the door opening means being a refrigerant of the refrigerant leak detecting means. The solenoid includes a solenoid that linearly moves the movable iron core based on leakage detection, and a link member that converts the linear movement of the movable iron core into movement in the opening direction of the sliding door.

  The low-temperature storage according to the present invention closes the opening of the storage chamber with a sliding door that can be freely opened and closed, and cools the storage chamber with a cooling device using a flammable or slightly flammable refrigerant, Refrigerant leakage detection means for detecting flammable or slightly flammable refrigerant leaked into the storage chamber, and door opening means for opening the sliding door, the door opening means being a refrigerant leakage detection of the refrigerant leakage detection means And a link member that converts the rotational movement of the movable iron core into the movement of the sliding door in the opening direction.

  In the low-temperature storage according to the present invention, it is preferable that the door opening means opens the sliding door by acting on a central portion of the sliding door in a direction orthogonal to the sliding direction of the sliding door.

  The low-temperature storage according to the present invention further includes an alarm unit, and the alarm unit preferably performs an alarm operation based on the refrigerant leak detection of the refrigerant leak detection unit.

  According to the low-temperature storage according to the present invention, even if flammable or slightly flammable refrigerant leaks from the refrigerant circuit constituting the cooling device into the storage chamber, the refrigerant leakage detection means detects the leakage of the refrigerant. In addition, since the door opening means is operated to open the sliding door, the inconvenience that the flammable or slightly flammable refrigerant stays in the storage chamber can be solved. In particular, in the present invention, the door opening means has a solenoid that linearly moves the movable iron core and a link member that converts the linear movement of the movable iron core into movement in the opening direction of the sliding door, thereby providing a peripheral edge of the opening. Even if it is not possible to secure a space for disposing the door opening means, the link member can convert the linear motion of the movable iron core of the solenoid into the motion in the direction to open the sliding door. Opening can be performed.

It is a front view of the low-temperature storage as 1st Embodiment to which this invention is applied. It is a schematic longitudinal side view of the low-temperature storage of FIG. It is a schematic explanatory drawing of the door opening means of the low-temperature storage of FIG. It is a control block diagram of the low-temperature storage of FIG. It is a front view of the ice case as 2nd Embodiment. It is a schematic explanatory drawing of the door opening means of the ice case of FIG. It is a schematic explanatory drawing of the door opening means as 3rd Embodiment.

  Hereinafter, a low temperature storage as an embodiment according to the present invention will be described with reference to the drawings. Here, the first embodiment adopting a push solenoid as the solenoid constituting the door opening means in the present invention and the second embodiment adopting a pull solenoid will be described as examples.

  First, the low temperature storage 1 of 1st Embodiment is demonstrated with reference to FIGS. 1-4. 1 is a front view of the low-temperature storage 1, FIG. 2 is a schematic longitudinal side view of the low-temperature storage 1, FIG. 3 is a schematic explanatory view of door opening means, and FIG. 4 is a block diagram of the control device C.

  The low-temperature storage 1 as the first embodiment has a main body constituted by a rectangular heat insulating box 2 having an opening formed on the front surface. A storage chamber 3 that opens to the front is formed in the heat insulation box 2, and a front opening (opening) 4 of the storage chamber 3 is closed by glass doors 5 and 5 that can be opened and closed to be seen through. ing. In the present embodiment, the glass doors 5 and 5 are sliding doors that can slide left and right. In addition, a plurality of shelves 6 are arranged in the storage chamber 3 for displaying commodities.

  A cooling chamber 8 partitioned from the interior of the storage chamber 3 by a partition plate 7 is formed at the upper rear portion inside the heat insulating box 2. In the cooling chamber 8, an evaporator 9 constituting the cooling device R, a capillary tube (not shown) as decompression means, and the like are disposed together with the evaporator blower 11. In the low temperature storage 1 according to the present embodiment, a machine room 13 surrounded by a decorative panel 12 is formed on the bottom surface of the heat insulating box 2. In the machine room 13, various devices such as a compressor 14, a condenser (heat radiator) 15, and a condenser blower 16 constituting the cooling device R are disposed. The compressor 14, the condenser 15, and the capillary tube and the evaporator 9, which are disposed in the machine room 13, are sequentially connected in an annular manner by a refrigerant pipe, so that a known refrigerant The circuit is configured. A predetermined amount of refrigerant is sealed in the refrigerant circuit.

  In the present invention, as described above, a natural refrigerant or a low GWP refrigerant is used as the refrigerant from the viewpoint of the ozone depletion coefficient and the global warming coefficient (GWP). Examples of the natural refrigerant include a flammable refrigerant typified by propane, and examples of the low GWP refrigerant include a slightly flammable refrigerant typified by R32, R1234yf, R1234ze, and the like. In the present invention, in the unlikely event that these flammable refrigerant or slightly flammable refrigerant leaks from the refrigerant pipe or the like in the heat insulating box 2, the high concentration of flammable and slightly flammable refrigerant will stay in the storage chamber 3. The door opening means for eliminating is provided.

  Hereinafter, the door opening means will be described with reference to FIG. The door opening means in the present embodiment includes a push solenoid 20 that linearly moves the movable iron core 20A based on a predetermined signal, and a link member 21 that converts the linear movement of the movable iron core 20A into movement in the opening direction of the glass door 5. It consists of and. In the present embodiment, the link member 21 includes a pressing piece 21B and an action piece 21C that are bent at a predetermined angle about the rotation shaft 21A. The link member 21 only needs to be disposed at a position in contact with the closed side end portion 5 </ b> A of the glass door 5 of the front opening 4. For example, if the link member 21 is provided at a position that is not conspicuous from the user if the glass door 5 is provided above or below the edge portion with which the closed end 5A is in contact, the appearance is improved and the door is opened and closed. Workability is improved.

  In addition to this, the link member 21 acts on the central part of the glass door 5 in the direction orthogonal to the sliding direction of the glass door 5 to open the glass door 5, so that the closed side end of the glass door 5 is opened. It is preferable to be provided at the edge portion that contacts the central portion of 5A. Thereby, it becomes possible to open the glass door 5 with much smaller force. In any case, the action piece 21 </ b> C of the link member 21 is arranged on the rail 17 side on which the glass door 5 slides, and the pressing piece 21 </ b> B of the link member 21 is outside the storage chamber 3 or the rail 17. It arrange | positions in the storage chamber 3 spaced apart.

  As an example, the push solenoid 20 is disposed so that the movable iron core 20A can project in the direction opposite to the side where the glass door 5 opens (that is, in the closing direction), and can press the pressing piece 21B of the link member 21. To do. When the pressing piece 21B of the link member 21 is pressed by the push solenoid 20, the link member 21 rotates about the rotating shaft 21A, and the action piece 21C opens the glass door 5 about the rotating shaft 21A. To turn. The pressing piece 21B and the action piece 21C of the link member 21 do not need to be configured to have the same length. For example, in order to secure a storage space for the push solenoid 20 and a door opening area by the action of the action piece 21C, the action piece 21C. Is preferably longer than the pressing piece 21B. Moreover, it is preferable that the end portion of the action piece 21C is urged by a urging member (not shown) such as a spring in a direction in which the glass door 5 is always closed. In addition, 17A in FIG. 3 is a rail guide.

  Next, with reference to FIG. 4, the control apparatus C of the low-temperature storage 1 concerning this Embodiment is demonstrated. The control device C is constituted by a general-purpose microcomputer. Connected to the input side of the control device C are a control panel 25 for performing various settings, various temperature sensors and pressure sensors 26, a refrigerant leakage sensor (refrigerant leakage detection means) 27, and the like.

The refrigerant leak sensor 27 performs detection output based on the lower combustion limit (hereinafter simply referred to as LFL, kg / m ³ ) of the flammable or slightly flammable refrigerant used in the low temperature storage 1. The lower limit of combustion of the refrigerant is defined in ISO5149-1. For example, the LFL of propane, which is a natural refrigerant, is 0.038 kg / m ³ , the LFL of R32, which is a slightly flammable refrigerant, is 0.307 kg / m ³ , the LFL of R1234yf is 0.289 kg / m ³ , and R1234ze (E). The LFL is 0.303 kg / m ³ . In the present embodiment, when a concentration equal to or lower than a quarter value of the combustion lower limit of each refrigerant is detected, the refrigerant leakage sensor 27 sends a detection signal to the control device C on the assumption that refrigerant leakage has been detected. .

  In addition, the refrigerant leakage sensor 27 may be disposed anywhere in the storage chamber 3, but the above-described refrigerant such as propane has a higher specific gravity than air, so More preferably, it is arranged.

  On the output side of the control device C described above, the compressor 14, the evaporator blower 11, the condenser blower 16, the push solenoid 20, the alarm buzzer 28 as a warning means, the warning lamp 29, and the like constituting the cooling device R are connected. ing. In the present embodiment, the alarm means is constituted by an alarm buzzer or an alarm lamp. However, in the present invention, the alarm means is not limited to this, and any means capable of notifying refrigerant leakage to the outside. Any means can be employed.

  With the above configuration, the control device C controls the operation of the compressor 14, the evaporator blower 11, and the condenser blower 16 based on the conditions input and set by the control panel 25 and the detection of various temperature sensors and pressure sensors 26. Then, the inside of the storage chamber 3 is cooled to a predetermined cooling temperature.

  Next, the operation at the time of refrigerant leakage detection will be described. A combustible or slightly flammable refrigerant leaks from a device constituting the refrigerant circuit such as the evaporator 9 disposed in the heat insulating box 2, and a refrigerant leak sensor 27 disposed in the storage chamber 3 leaks the refrigerant. When detected, the control device C performs the opening operation of the glass door 5 closed by operating the push solenoid 20 constituting the door opening means or the complete closing avoiding operation based on the refrigerant leakage detection. Specifically, in the link member 21 constituting the door opening means, the action piece 21C is always positioned in the closing direction of the glass door 5 by the biasing means. In this state, when the push solenoid 20 is operated, the movable iron core 20A presses the pressing piece 21B of the link member 21 in the closing direction of the glass door 5, and the action piece 21C of the link member 21 acts as the urging force of the urging means. Accordingly, the glass door 5 which is turned around the turning shaft 21A and is closed at the end of the action piece 21C is slid in the opening direction. Thereby, the glass door 5 will be in the open state by the stroke of the action piece 21C of the link member 21. In addition, while the push solenoid 20 is pressing the pressing piece 21B, the action piece 21C maintains this position, so that even if the glass door 5 is intentionally closed, the action piece 21C causes the glass door 5 to be closed. Can avoid the inconvenience of being completely closed.

  Thus, according to the present invention, even if a flammable or slightly flammable refrigerant leaks from the refrigerant circuit constituting the cooling device R into the storage chamber 3, the refrigerant leakage sensor 27 is Since the leak is detected and the push solenoid 20 constituting the door opening means is operated to open the glass door 5, the inconvenience that the flammable or slightly flammable refrigerant stays in the storage chamber 3 can be solved. Therefore, a high concentration of combustible or slightly flammable refrigerant stays in the storage chamber 3, thereby avoiding the risk of ignition and the like, and ensuring safety.

  In particular, in the present invention, the door opening means includes a push solenoid 20 that linearly moves the movable iron core 20A, and a link member 21 that converts the linear movement of the movable iron core 20A into movement in the opening direction of the glass door 5. Thus, even if it is not possible to secure a space for disposing the door opening means at the periphery of the front opening 4, the link member 21 can slide the linear motion of the movable iron core 20A of the solenoid 20 in the direction to open the glass door. Therefore, the door can be opened without hindrance.

  Further, in the present embodiment, when the refrigerant leakage sensor 27 detects refrigerant leakage, the control device C activates alarm means such as the alarm buzzer 28 and the alarm lamp 29 so that the user, administrator, etc. Notify refrigerant leakage. The alarm buzzer 28 is preferably output toward the outside of the low temperature storage. In the push solenoid 20, the movable iron core 20 </ b> A returns to the original position based on the release operation of the user or the like, so that the action piece 21 </ b> C of the link member 21 is always closed by the urging member. The glass door 5 can be made in a state that can be completely closed by rotating in the direction about the rotation shaft 21A.

  Next, a second embodiment employing a pull solenoid will be described with reference to FIGS. FIG. 5 is a front view of an ice case 30 as a low-temperature storage, and FIG. 6 is a schematic explanatory view of a door opening means.

  As shown in FIG. 5, the ice case 30 as the second embodiment is constituted by a rectangular heat insulating box 31 having an opening formed on the upper surface. A storage chamber (not shown) that opens to the upper surface is formed in the heat insulating box 31, and the upper surface opening (opening) 32 of the storage chamber is closed by glass doors 33 and 33 that can be opened and closed and the interior can be seen through. ing. In the present embodiment, the glass doors 33 and 33 are sliding doors that are slidable in the back direction from the near side. Further, the glass doors 33 and 33 are formed to be inclined so as to increase from the near side to the back direction, and the glass door 33 is slidable in a closing direction by its own weight.

  The ice case 30 as the second embodiment includes the cooling device R as in the first embodiment. However, since these configurations are the same as those in the first embodiment, description thereof is omitted here. To do. Here, door opening means different from the above-described first embodiment will be described with reference to FIG.

  The door opening means in the second embodiment includes a pull solenoid 40 that linearly moves the movable iron core 40A based on a predetermined signal, and a link member 41 that converts the linear movement of the movable iron core 40A into movement in the opening direction of the glass door 33. It consists of and. In the present embodiment, as shown in FIG. 6, the link member 41 includes a connecting wire 42 that connects the open side end portion 33 </ b> A of the glass door 33 and the movable iron core 40 </ b> A, and an open side end portion 33 </ b> A of the glass door 33. And a movable iron core 40 </ b> A are provided with a winding member 43 that enables the connecting wire 42 to be wound and pulled out by rotation. For example, the pull solenoid 40 is arranged along the inner wall surface of the heat insulating box 31 so that the movable iron core 40A linearly moves in the vertical direction with the movable iron core 40A provided on the pull solenoid 40 as the upper side. The When the movable iron core 40A moves downward by the pull solenoid 40, the connecting wire 42 is pulled downward, the winding member 43 around which the connecting wire 42 is wound rotates, and the glass door 33 to which the connecting wire 42 is connected. Slides on the rail 44 in the opening direction.

  In the present embodiment, the connecting line 42 of the link member 41 acts on the central portion of the glass door 33 in the direction orthogonal to the sliding direction of the glass door 33 to open the glass door 33. It is preferable to be connected to the central portion of the open side end portion 33A. Thereby, it becomes possible to open the glass door 33 with much smaller force.

  In the second embodiment, the control of the door opening means based on the refrigerant leak detection of the refrigerant leak sensor 27 is the same as in the first embodiment described above. Therefore, even when the pull solenoid 40 is used, the glass door 33 can be slid in the opening direction based on the detection of the refrigerant leakage, similarly to the case where the push solenoid 20 is used. Further, while the pull solenoid 40 is operating, the glass door 33 resists its own weight and maintains this position. Therefore, even if the glass door 33 is intentionally closed, the glass door 33 is completely closed. Inconvenience can be avoided.

  Therefore, in the case of the second embodiment as well as the first embodiment, even if flammable or slightly flammable refrigerant leaks into the storage chamber 3 from the refrigerant circuit constituting the cooling device R, the refrigerant Since the leakage sensor 27 detects the leakage of the refrigerant and operates the pull solenoid 40 that constitutes the door opening means to open the glass door 33, the incombustible or slightly flammable refrigerant stays in the storage chamber 3. Can be eliminated. In this embodiment, since the glass door 33 formed in the upper surface opening is opened and a high-concentration refrigerant stays in the storage chamber 3, for example, the rotation of the evaporator blower 11 is used. By increasing the number from that during normal operation, it is possible to promote the inflow of outside air into the storage chamber 3 and efficiently discharge the refrigerant in the storage chamber 3 to the outside.

  Also in this case, when the refrigerant leakage sensor 27 detects the refrigerant leakage, the control device C operates the alarm means such as the alarm buzzer 28 to notify the user, the administrator, etc. of the refrigerant leakage. . In the pull solenoid 40, the glass door 33 can be closed by its own weight when the movable iron core 40A returns to the original position based on the release operation of the user or the like.

  Further, in the ice case 30 as the second embodiment described above, the pull solenoid 40 is used to open the glass door 33 when refrigerant leakage is detected. In addition to this, as the third embodiment, FIG. As shown in FIG. 5, the glass door 33 may be opened when a refrigerant leak is detected using a rotary solenoid that rotates the movable iron core. That is, the door opening means shown in FIG. 7 includes a rotary solenoid 50 that rotates the movable core 50A based on a predetermined signal, and a link member that converts the rotational movement of the movable core 50A into movement in the opening direction of the glass door 33. 51. In the embodiment of FIG. 7, the link member 51 includes a connecting wire 42 that connects the open side end 33A of the glass door 33 and the movable iron core 50A, and the open side end 33A of the glass door 33 and the movable iron core 50A. A winding member 43 is provided that enables the connecting wire 42 to be wound and pulled out by turning. For example, the rotary solenoid 50 is arranged along the inner wall surface of the heat insulating box 31 so that the movable iron core 50A rotates in the horizontal direction with the movable iron core 50A provided in the rotary solenoid 50 as a horizontal direction. When the movable iron core 50A is rotated in a predetermined direction by the rotary solenoid 50, the connecting wire 42 is wound around the moving iron core 50A while being pulled downward, and the winding member 43 around which the connecting wire 42 is wound rotates. The glass door 33 to which the connecting wire 42 is connected slides on the rail 44 in the opening direction.

  Even in this case, the connecting line 42 of the link member 51 acts on the central portion of the glass door 33 in the direction orthogonal to the sliding direction of the glass door 33 so as to open the glass door 33. It is preferable to be connected to the center of the open side end 33A. Thereby, it becomes possible to open the glass door 33 with much smaller force.

  In the third embodiment, the control of the door opening means based on the refrigerant leak detection of the refrigerant leak sensor 27 is the same as that of the first embodiment described above. Therefore, even when the rotary solenoid 50 is used, the glass door 33 can be slid in the opening direction based on the detection of the refrigerant leakage, similarly to the case where the push solenoid 20 is used. Further, while the rotary solenoid 50 is operating, the glass door 33 resists its own weight and maintains this position. Therefore, even if the glass door 33 is intentionally closed, the glass door 33 is completely closed. Inconvenience can be avoided.

  In the ice case 30 in the second and third embodiments described above, the door opening means for pulling up the glass door 33 that is slidable in the back direction from the front side and the open side end portion 33A of the rear end of the glass door 33 by the link member. However, the present invention is not limited to this. That is, a configuration may be adopted in which the closed side end portion of the front end of the glass door 33 slidable from the near side to the far side is pushed up by the door opening means using the push solenoid as used in the first embodiment. .

  The low-temperature storage according to the present invention can avoid inconvenience that a high-concentration refrigerant stays in the storage chamber by detecting refrigerant leakage and opening the door. Therefore, even when a refrigerant having a combustible or slightly flammable risk such as a natural refrigerant or a low GWP refrigerant is used, safe use can be realized.

R Cooling device 1 Low temperature storage 2 Heat insulation box 3 Storage room 4 Front opening (opening)
5, 33 Glass door (sliding door)
6 Shelf 7 Partition plate 8 Cooling chamber 9 Evaporator 11 Blower for evaporator 12 Cosmetic panel 13 Machine room 14 Compressor 15 Condenser 16 Blower for condenser 17 Rail 20 Push solenoid 20A, 40A, 50A Movable iron core 21, 41, 51 Link member 21A Rotating shaft 21B Pressing piece 21C Acting piece 25 Control panel 26 Various temperature / pressure sensors 27 Refrigerant leakage sensor (refrigerant leakage detecting means)
28 Alarm buzzer (alarm means)
29 Alarm lamp (alarm means)
30 ice case (low temperature storage)
31 Heat insulation box 32 Upper surface opening (opening)
40 Pull solenoid 42 Connecting wire 43 Winding member 44 Rail 50 Rotary solenoid

Claims (4)

In a low-temperature storage that closes the opening of the storage chamber with a sliding door that can be freely opened and closed, and cools the storage chamber with a cooling device using a flammable or slightly flammable refrigerant,
Refrigerant leakage detection means for detecting flammable or slightly flammable refrigerant leaked into the storage chamber;
Door opening means for opening the sliding door,
The door opening means includes a solenoid that linearly moves the movable iron core based on the refrigerant leak detection of the refrigerant leak detection means, and a link member that converts the linear movement of the movable iron core into movement in the opening direction of the sliding door. Low temperature storage characterized by having. In a low-temperature storage that closes the opening of the storage chamber with a sliding door that can be freely opened and closed, and cools the storage chamber with a cooling device using a flammable or slightly flammable refrigerant,
Refrigerant leakage detection means for detecting flammable or slightly flammable refrigerant leaked into the storage chamber;
Door opening means for opening the sliding door,
The door opening means includes a solenoid that rotates the movable iron core based on the refrigerant leak detection of the refrigerant leak detection means, and a link member that converts the rotary movement of the movable iron core into movement in the opening direction. Low temperature storage characterized by having.   The low temperature storage according to claim 1 or 2, wherein the door opening means acts on a central portion of the sliding door in a direction orthogonal to a sliding direction of the sliding door to open the sliding door. With alarm means,
The low-temperature storage according to any one of claims 1 to 3, wherein the alarm unit performs an alarm operation based on the refrigerant leak detection of the refrigerant leak detection unit.

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