JP2017219278A - Cooling storage house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety of a refrigeration unit and a cooling storage house using a combustible refrigerant.SOLUTION: When a state in which an internal detection temperature Texceeds an alarm temperature Tthat has been set to a higher temperature than an internal set temperature Tduring its operation under a normal cooling mode (S1) at a cooling storage house R1 reaches a predetermined time continuously Y(ES at S2), it is determined that refrigerant leakage may occur, a control is performed under a leakage alarm mode and a condenser fan 22A is always operated in a forced manner irrespective of any relation with the operation state of a compressor 23 and the like (S3). When occurrence of refrigerant leakage is alarmed, the condenser fan 22A arranged to cool the condenser 22 where refrigerant is easily leaked out is always operated, the leaked combustible refrigerant is diffused and diluted to restrict a state in which a concentration of the combustible refrigerant is locally increased. In this case, it is also applicable that a user is noticed with attention that either an alarm mode display (S4), an alert display (S6) or the like is appropriately displayed at a display part 29.SELECTED DRAWING: Figure 5

Description

  The technique disclosed by this specification is related with the cooling storage provided with the freezing apparatus using a combustible refrigerant | coolant.

  Conventionally, a cooling storage is provided with a refrigeration apparatus including a so-called refrigeration cycle in which a compressor, a condenser, a cooler, and the like are circulated and connected by a refrigerant pipe filled with a refrigerant. The condenser is provided with a condenser fan for air-cooling the condenser whose temperature has been increased by the heat of condensation generated during the liquefaction condensation of the refrigerant, and a circulating air flow passing through the cooler is provided in the storage of the cooling storage. An in-compartment fan is provided. For example, as described in Patent Document 1 below, the compressor, the condenser fan, and the internal fan (cooling fan) are driven, and heat exchange is performed while air in the storage is sucked and passes through the cooler. The cooling operation is performed by discharging the cool air generated by the above toward the storage. During this time, the temperature in the storage is detected, and the operation of the compressor and the like is controlled based on the detected temperature in the storage, so that the temperature in the storage is maintained at a substantially constant temperature. As shown in FIG. 3 and the like of Patent Document 1, in the cooling storage, the compressor and the condenser fan are usually operated or stopped synchronously.

JP 2006-29772 A

  By the way, in the refrigeration cycle as described above, chlorofluorocarbon-based refrigerants have been used in the past, but the transition to alternative refrigerants is being promoted in consideration of the effects on ozone layer destruction and global warming. . Currently, combustible refrigerants mainly composed of propane, isobutane, and the like are used as alternative refrigerants. If such a combustible refrigerant leaks from the refrigerant pipe and the concentration thereof becomes high even locally, there is a possibility that an ignition accident may be caused by using an electrical component or the like used for operation control of the cooling storage as an ignition source.

  The technology disclosed in this specification has been completed based on the above circumstances, and aims to improve the safety of a cooling storage using a flammable refrigerant.

  The cooling storage disclosed by the present specification includes a storage in which stored items are stored, a compressor, a condenser, and a cooler that are circulated and connected by a refrigerant pipe filled with a combustible refrigerant to cool the storage. A refrigerator, a condenser fan provided in the condenser, an internal temperature sensor for detecting the temperature in the storage, and an internal detection temperature detected by the internal temperature sensor. A control unit that controls the operation of the compressor and the condenser fan to maintain the temperature in the vicinity of a set temperature, and the state in which the inside detected temperature exceeds a warning temperature higher than the inside set temperature is a predetermined time. When continued, the control unit is a cooling storage that is controlled in a leakage warning mode that maintains operation of the condenser fan.

  When refrigerant leakage occurs, the amount of refrigerant circulating in the refrigeration cycle decreases, so that the cooling capacity of the refrigeration apparatus decreases. When the cooling capacity is lowered, the interior cannot be sufficiently cooled, and the interior temperature rises. In the above configuration, when a warning temperature higher than the set temperature inside the warehouse is set in advance and the state where the inside detection temperature exceeds the warning temperature continues and reaches a predetermined time, there is a possibility that refrigerant leakage may have occurred. to decide. As described above, by using the internal temperature sensor installed for maintaining the internal temperature for detecting the refrigerant leakage, it is possible to foresee the possibility of the refrigerant leakage without adding new parts. Here, since the flammable refrigerant is likely to leak, for example, at a connecting portion of a plurality of members constituting the refrigerant pipe, refrigerant leakage occurs in a condenser in which the refrigerant pipe has a plurality of connecting parts and is meandered. It can be said that it is easy. When refrigerant leakage occurs in the refrigerant pipe arranged in the condenser, if the condenser fan provided to cool the condenser is operated, the combustible refrigerant is diffused and diluted by the condenser fan. The situation where the concentration rises locally can be suppressed. According to the above configuration, when the occurrence of refrigerant leakage is suspected, the refrigeration apparatus is controlled in the leakage warning mode, that is, the condenser fan is always forcibly operated regardless of the operation state of the compressor or the like. As a result, it is possible to reduce the risk of an ignition accident without imposing a special burden on the user and to improve the safety of the cooling storage. In the above leakage warning mode, the condenser fan may be always operated at the maximum rotation speed, or it is controlled at the normal rotation speed during the compressor operation, and is operated at the maximum rotation speed while the compressor is stopped. You may do it.

  The cooling storage disclosed in the present specification has a display unit on the outer surface, and when the control unit performs control in the leakage warning mode, a warning mode display is displayed on the display unit. May be.

  According to the above configuration, it is possible to alert the user to urge the user to take a warning action such as avoiding the use of fire or ventilating, and in the event of an abnormality, a quick response is possible. .

  Alternatively, the cooling storage disclosed by the present specification further includes a refrigerant sensor that has a display unit on an outer surface and detects the flammable refrigerant leaked from the refrigerant pipe, and the control unit is controlled in the leakage warning mode. When the refrigerant sensor has a refrigerant detection history, a warning mode display may be displayed on the display unit.

  According to the above configuration, the rise in the internal temperature due to other factors, such as opening the storage door or storing a large amount of high-temperature storage in the storage, is mistaken as the occurrence of refrigerant leakage, and the user's The situation that calls attention can be reduced. Here, the refrigerant detection history may be considered only for those detected within a certain past time. In this way, it is possible to suppress a situation in which the user has an unnecessary anxiety without considering the past history that is not considered to be related to the rise in the internal temperature in question. In addition, although there is no warning mode display when there is no refrigerant | coolant detection log | history, since control is performed in leakage warning mode, safety | security is ensured.

  The cooling storage disclosed by the present specification has a display unit on the outer surface, further includes a condenser temperature sensor that detects the temperature of the condenser, and the control unit performs control in a leakage warning mode, and When the temperature of the condenser reaches a predetermined temperature or higher, a warning display may be displayed on the display unit. Alternatively, the cooling storage disclosed by the present specification further includes a condenser fan detection unit that has a display unit on an outer surface and detects an operation state of the condenser fan, and the control unit controls the leakage warning mode. If the rotation signal of the condenser fan is not obtained from the condenser fan detection unit, a warning display may be displayed on the display unit.

  In the above configuration, when the condenser fan is constantly operated by control in the leakage warning mode and the condenser temperature is rising, or the rotation signal of the condenser fan is obtained. If not, it is determined that there is a possibility that the combustible refrigerant leaked due to the failure of the condenser fan cannot be diffused and diluted. In this case, it is possible to display a warning display on the display unit to alert the user to the operation of the cooling storage, and to urge warning actions such as avoidance of use of fire and ventilation. If a warning display is displayed in addition to the warning mode display, alert the user to a higher degree of altitude, and immediately ventilate the use of fire, or check the cooling storage such as the refrigeration system. And so on.

  Alternatively, the cooling storage disclosed by the present specification includes a refrigerant sensor that detects the flammable refrigerant leaked from the refrigerant pipe, and the refrigerant sensor after the control unit starts control in the leakage warning mode. When the flammable refrigerant is detected continuously for a predetermined time or more, and the detected temperature in the refrigerator is continuously lower than the set temperature in the refrigerator for a predetermined time or more, the leakage warning mode is canceled. May be.

  When refrigerant leakage actually occurs, all or most of the combustible refrigerant in the refrigeration cycle is lost after a predetermined time, and normal cooling operation cannot be performed, and the internal temperature rises. On the contrary, when the combustible refrigerant is detected for a predetermined time or longer and the internal temperature is maintained in a normal temperature range below the warning temperature, that is, the cooling operation is normally performed. If it is, it is assumed that the refrigerant leak is not generated but the refrigerant sensor is sensitized. In the above configuration, when such a determination is made, the leakage warning mode is canceled and the normal cooling mode is switched.

  Alternatively, the cooling storage disclosed by the present specification has a display unit on an outer surface, and includes a refrigerant sensor that detects the combustible refrigerant leaked from the refrigerant pipe, and the control unit performs control in the leakage warning mode. When the refrigerant sensor continuously detects the flammable refrigerant for a predetermined time or more and the internal detection temperature falls below the internal set temperature for a predetermined time or more, the leakage The alert mode may be canceled and a sensor sensitization display may be displayed on the display unit.

  According to the said structure, a user can be notified that there exists a possibility that the refrigerant | coolant sensor has become sensitive, and a necessary response | compatibility, such as a check of a refrigerant | coolant sensor, can be encouraged. Further, when the warning mode display or warning display is displayed, the user can be prompted to release the warning. When the warning mode display or warning display is displayed, the previous display may be canceled when displaying the sensor sensitization display.

  According to the technology disclosed in the present specification, in a cooling storage room equipped with a refrigeration apparatus using a flammable refrigerant, if the occurrence of refrigerant leakage is suspected, the condenser fan is always operated to diffuse the flammable refrigerant. By diluting and appropriately displaying the user's attention, the risk of ignition accidents can be reduced and safety can be improved.

External appearance front view of the cooling storage room provided with the refrigeration unit which concerns on 1st embodiment Longitudinal section of cooling storage A perspective view of the refrigeration unit attached to the ceiling wall of the heat insulation box as seen from the front right Block diagram showing operation control mechanism of cooling storage Flow chart showing operation control operation of cooling storage Block diagram showing the operation control mechanism of the second embodiment The flowchart which shows the operation control action of the cooling storage which concerns on 2nd embodiment.

<First embodiment>
Hereinafter, the cooling storage provided with the refrigeration unit according to the first embodiment will be described with reference to FIGS. 1 to 4. In the following description, the front side in FIG. 1 is the front (front), the right side is the right, and the upper side is the top. In FIG. 3, the lower left side of the drawing is the front, the lower right side is the right, and the upper front side of the drawing is the upper side. In addition, about several identical members, a code | symbol may be attached | subjected to one member and a code | symbol may be abbreviate | omitted about another member.

  As shown in FIG. 1 and FIG. 2, the cooling storage R1 provided with the refrigeration unit 2 of the present embodiment is a vertical two-door refrigerator, and the heat insulating box 1 whose inside is a storage room (storage) 10 is provided. A machine room 20 is provided on the upper surface of the heat insulating box 1, supported by legs 13 provided at the four corners of the bottom surface. A horizontal partition frame 14 is attached to an opening formed on the front surface of the heat insulating box 1 to form two upper and lower openings, and a door 15 is attached to each opening. A shelf 16 is provided in the storage chamber 10, and stored items are placed on and stored on the shelf 16.

  The machine room 20 is defined by standing a front panel 20F along the front edge of the ceiling wall 11 of the heat insulating box 1 and a side panel 20S along the left and right side edges. As shown in FIG. 1, a visually recognizable display unit 29 is provided on the outer surface of the front panel 20 </ b> F for displaying the operating state of the cooling storage R <b> 1.

  As shown in FIG. 2, the refrigeration unit 2 according to this embodiment is disposed inside the machine room 20. Specifically, the window hole 12 is provided in the ceiling wall 11 of the heat insulating box 1, and the unit base 21 is disposed so as to close the upper surface of the window hole 12. A condenser 22 and a compressor 23 having a condenser fan 22A (see FIG. 3 and the like) on the rear surface are placed on the upper surface of the unit table 21, and a cooler 24 is attached to the lower surface of the unit table 21. Circulatingly connected by a refrigerant pipe 25 penetrating the unit table 21 up and down. In the refrigerant pipe 25, a flammable refrigerant made of propane or isobutane and heavier than air is enclosed. The condenser fan 22A is provided with a condenser fan detector 22D that detects the operating state of the fan (see FIG. 4).

As shown in FIG. 2, from the lower side of the front edge (left side in FIG. 2) of the window hole 12, the drain pan 17 that also serves as a cooling duct has a downward slope toward the rear wall of the heat insulation box 1. The cooler chamber 30 is formed between the unit base 21 and the drain pan 17 by being stretched. When the unit base 21 is installed so as to block the upper surface of the window hole 12, the cooler 24 is accommodated in a state of floating in the cooler chamber 30. On the front side of the drain pan 17, an internal fan 31 that is driven by a motor is provided, and on the rear side of the drain pan 17, a cold air blowout portion 32 is formed. As shown in FIG. 2, in the present embodiment, the internal temperature sensor 19 is attached in the cooler chamber 30, and as will be described later, the internal temperature detected by the internal temperature sensor 19 (T _m ), the operation of the refrigeration apparatus is controlled. The internal temperature sensor 19 may be attached not in the cooler chamber 30 but in the storage chamber 10.

  FIG. 3 shows the refrigeration unit 2 attached to the ceiling wall 11 of the heat insulation box 1. As shown in FIGS. 2 and 3, the unit base 21 is formed in a plate shape having a certain thickness, and the window hole 12 is located at the rear side (upper right side in FIG. 3) of the upper surface of the ceiling wall 11. It arrange | positions so that upper direction may be plugged up. A condenser 22 and a compressor 23 are placed on the upper surface of the unit base 21 slightly to the left and right in the center so that they are arranged in the front-rear direction. 25 circulates and connects to the cooler 24 attached below the unit table 21. In the condenser 22, the refrigerant pipe 25 includes a linear portion 25L extending in a horizontal direction across a plurality of upper and lower stages, and a plurality of bent portions bent so as to form a U shape on both the left and right sides of the condenser 22. 25B, the bent portion 25B that is meandered and welded to the straight portion 25L is exposed on both the left and right side surfaces of the condenser 22.

  In the refrigeration unit 2 according to the present embodiment, a relay box 41 (an electrical box) that accommodates a relay component (not shown) inside is placed on the upper surface of the unit base 21 with a space on the right side of the condenser 22. . The relay component is a component required for relaying signals from various sensors provided in the cooling storage R1 to control the operation of the cooling storage R1. The structure is not particularly limited. The left side wall 41L of the relay box 41 includes a mounting hole for mounting a component, a board, or the like housed inside, and a conduction hole for conducting a lead wire connected to the component housed inside. A plurality of through holes 41H are perforated.

  A drive box 42 is placed behind the relay box 41 and to the right of the compressor 23. A control board (not shown) is accommodated in the drive box 42, and a control unit 40 including a microcomputer for controlling the compressor 23, the condenser fan 22A, the internal fan 31, and the like is provided. As shown in FIG. 4, the internal temperature sensor 19, the condenser fan detection unit 22 </ b> D, and a refrigerant sensor 60 described later are connected to the input side of the control unit 40, and the compressor 23 and the condenser fan are connected to the output side. The internal fan 31 and the display unit 29 are connected to control the operation of the compressor 23, the condenser fan 22A, and the internal fan 31 on the basis of information input from a device connected to the input side. An appropriate display is made on the display unit 29. Details of the control will be described later. The left side wall 42L of the drive box 42 functions as a heat radiating plate for radiating heat from the control board accommodated in the drive box 42. The left side wall 42L is formed so as not to have a through-hole and restricts the passage of gas. It is supposed to be. The drive box 42 is disposed such that the rear wall substantially overlaps the rear edge of the unit base 21.

  In the refrigeration unit 2 according to the present embodiment, as shown in FIG. 3, a shielding wall 50 that restricts the passage of gas is disposed between the right side surface of the condenser 22 and the left side wall 41 </ b> L of the relay box 41. The As the shielding wall 50, for example, a metal plate material or the like can be bent as necessary. The material is not particularly limited as long as it can restrict the passage of gas. However, considering safety and the like, it is preferable to use a flame retardant material. The shielding wall 50 according to the present embodiment includes a substantially rectangular vertical portion 51 having a width from the front wall of the drive box 42 to the front edge of the unit base 21 and a height substantially the same as the height of the condenser 22. And a horizontal portion 52 that is bent so as to be horizontal at a position on the upper front side of the vertical portion 51. The shielding wall 50 has a lower edge 53 bent vertically on the lower side of the vertical portion 51 at an appropriate position of the unit base 21 and a connecting portion 54 formed extending behind the vertical portion 51 at the drive box 42. The left side wall 42L and the horizontal portion 52 are fixed to the upper wall of the condenser 22 by screws. Thereby, the vertical part 51 of the shielding wall 50 is arranged between the bent part 25B of the refrigerant pipe 25 exposed on the left and right side surfaces of the condenser 22 and the left side wall 41L of the relay box 41, and the horizontal part 52 is It arrange | positions so that the upper part of the bending part 25B may be covered.

  As shown in FIG. 3, a refrigerant sensor 60 capable of detecting a combustible refrigerant enclosed in the refrigerant pipe 25 is attached to a surface of the vertical portion 51 of the shielding wall 50 facing the bent portion 25 </ b> B of the condenser 22. . As the refrigerant sensor 60, for example, a detection unit (not shown) provided with an element whose resistance value changes when it contacts a specific chemical structure included in the flammable refrigerant is provided, and the resistance value exceeds a certain value. A device configured to emit a warning sound when changed can be used. The refrigerant sensor 60 has a detection opening 61 connected to the detection unit, and the above detection is performed on the gas flowing into the refrigerant sensor 60 from the detection opening 61 and contacting the detection unit. The refrigerant sensor 60 has a detection opening at the same height as the lowermost bent portion 25B among the plurality of bent portions 25B exposed on the side of the condenser 22 near the lower edge of the vertical portion 51 of the shielding wall 50. 61 is preferably attached so as to be oriented in the horizontal direction. In addition, the refrigerant sensor 60 is preferably attached so that the bottom surface does not directly contact the top surface of the unit table 21 in order to make it difficult to be affected when the top surface of the unit table 21 is fouled by liquid adhesion or the like. The refrigerant sensor 60 is configured to record a past refrigerant detection history, for example, over 24 hours.

Next, the operation of the refrigeration apparatus according to the cooling storage R1 configured as described above will be described.
In the cooling storage R1, when the compressor 23, the internal fan 31 and the condenser fan 22A of the refrigeration apparatus are driven, the internal fan 31 drives the air in the storage chamber 10 as shown by the arrows in FIG. Cold air that is sucked into the cooler chamber 30 and heat-exchanged while passing through the cooler 24 is blown into the storage chamber 10 from the blowing portion 32, thereby cooling the interior of the storage chamber 10. Refrigeration system, by being operated controlled based on the internal temperature detected T _m by-compartment temperature sensor 19 as described later, the interior temperature (T) is pre-set the internal set temperature (T _s) To be maintained.

The inside set temperature T _s may be a temperature region having a certain width. In the present embodiment, for example, a lower limit value (T _sl ) of the internal temperature and an upper limit value (T _sh ) of the internal temperature are set according to the purpose of use of the cooling storage R 1, and are input and set to the control unit 40. deep. For example, the lower limit value T _sl and the upper limit value T _sh can be set to a value that is about 2K lower or higher than the most desirable temperature as the internal temperature T. In the control unit 40, the lower limit value T _sl and the upper limit value T _sh set as described above are compared with the detected internal temperature T _m sequentially input from the internal temperature sensor 19 connected to the input side, and the refrigeration apparatus Is controlled.

FIG. 5 shows a control operation in the present embodiment.
After starting and driving of the compressor 23, the internal fan 31 and the condenser fan 22A is started, the refrigeration apparatus is controlled in the normal cooling operation, that is, in the normal cooling mode (step S1).
In the normal cooling mode, the internal detection temperature T _m which is detected by the inside temperature sensor 19 becomes lower than the lower limit value T _sl, the compressor 23, the condenser fan 22A and the internal fan 31 is stopped. When the inside detection temperature T _m becomes higher than the upper limit value T _sh , the compressor 23, the condenser fan 22 </ b> A and the inside fan 31 are re-driven, and such control is repeated, whereby the inside temperature T Is maintained in the set temperature range. In this normal cooling mode, the condenser fan 22 </ b> A is on / off controlled in synchronization with the operation of the compressor 23.

By the way, in the refrigeration apparatus according to the present embodiment, while the control is performed in the normal cooling mode as described above, the warning temperature (T _e ) in which the inside detection temperature T _m is higher than the inside setting temperature T _s. When the predetermined time is continuously reached (step S2 is YES), the control is switched to the leakage warning mode (step S3). Specifically, vigilance temperature _{T e} is set also, for example, about 10K higher than the upper limit _{T sh,} together with the internal set temperature _{T s} (lower limit _{T sl} and the upper limit value _{T sh),} the control unit 40 Input settings are made in advance. The internal detection temperature T _m is high and becomes the time integration than vigilance temperature T _e is started and the internal temperature detected T _m is the higher than the warning temperature T _e is continued for a predetermined time (e.g. 2 hours) or more The control unit 40 is switched to the leakage warning mode.

In the leakage warning mode, the condenser fan 22A is continuously operated regardless of the operating state of the compressor 23 and the like. That is, in the leakage warning mode, when the inside detection temperature _Tm becomes lower than the lower limit value T _sl , the compressor 23 and the inside fan 31 are stopped, but the operation of the condenser fan 22A is maintained. Further, when the internal temperature detected T _m is higher than the upper limit value T _sh, compressor 23 and the internal fan 31 is driven again, the operation of the condenser fan 22A is maintained.

  When the control in the leakage warning mode is started, a warning mode display is displayed on the display unit 29 (step S4). The warning mode display may display a text prompting attention to ventilation since there is a possibility of refrigerant leakage on the display unit 29, or may be displayed with symbols, numerical values, etc. You may make it confirm.

  After the control in the leakage warning mode is started, the condenser fan detection unit 22D connected to the input side of the control unit 40 is output although the instruction is output to maintain the operation of the condenser fan 22A. When the rotation signal of the fan is not obtained from step S5 (NO in step S5), a warning display command is output from the control unit 40, and a warning display is displayed on the display unit 29 (step S6).

Further, in the present embodiment, the refrigerant detection signal is continuously input from the refrigerant sensor 60 for a predetermined time (for example, 4 hours) while the control in the leakage warning mode is performed (YES in step S7). and the internal temperature detected T _m is the upper limit T _sh in interior temperature a predetermined time (e.g. 4 hours) when below continued (step S8 YES), the release leakage alarm mode controller 40 It is set to be. In this case, when the warning mode display in step S4 and the warning display in step S6 are displayed on the display unit 29, these displays are canceled (step S9). And the sensor sensitization display is displayed on the display part 29 (step S10). Note that after the leakage warning mode is released, control is performed by switching to the normal cooling mode.

According to this embodiment, the following effects can be obtained.
In cold storage R1 configured as described above, the internal detection temperature T _m is a state above the warning temperature T _e which is previously set to a temperature higher than the storage room the preset temperature T _s is continued reaches a predetermined time When (step S2 is YES), it is determined that there is a possibility of refrigerant leakage, and control is performed in the leakage warning mode, so that the condenser fan 22A is forced regardless of the operating state of the compressor 23 and the like. It is always operated (step S3). When the occurrence of refrigerant leakage is wary, in the condenser 22 where the refrigerant is likely to leak, the condenser fan 22A provided for air-cooling the condenser 22 is always operated to diffuse and dilute the leaked combustible refrigerant. Thus, it is possible to suppress a situation where the concentration of the combustible refrigerant locally increases. Here, by using the internal temperature sensor 19 installed for maintaining the internal temperature for detecting the refrigerant leakage, it is possible to foresee the possibility of the refrigerant leakage without adding new parts. It becomes possible to cope. As a result, it is possible to reduce the risk of an ignition accident without affecting the use situation and improve the safety of the cooling storage R1.

In the present embodiment, in step S2, warning temperature T _e and 10K set higher than the upper limit value T _sh in the internal set temperature, state of the internal detected temperature T _m is above the warning temperature T _e is more than 2 hours When continuing, control is performed by switching to the leakage warning mode. By setting it as such, the possibility that a rise in the internal temperature due to a factor that is not refrigerant leakage is misidentified as refrigerant leakage is reduced.
Further, in the leakage warning mode, the condenser fan 22A may be always operated at the maximum rotation speed, or the compressor fan 22A is controlled at the normal rotation speed during the operation of the compressor 23 and is operated at the maximum rotation while the compressor 23 is stopped. You may make it drive by number.

  In the cooling storehouse R1 according to the present embodiment, when the control unit 40 starts control in the leakage warning mode, a warning mode display is displayed on the display unit 29 (step S4). When the warning mode display is displayed to the user, etc., to reduce the risk of ignition accidents and to respond quickly to abnormal situations by telling them to keep using the fire and ventilate in advance. Is possible.

  In this embodiment, the condenser fan 22A is connected to the input side of the control unit 40, the control unit 40 performs control in the leakage warning mode, and a rotation signal is obtained from the condenser fan detection unit 22D. If not (NO in step S5), a warning display is displayed on the display unit 29 (S6). In such a case, it is determined that there is a possibility that the condenser fan 22A has failed and the leakage refrigerant has not been diffused and diluted, and a warning display is displayed. Thereby, a user's attention to the driving | operation of cooling storage R1 can be alerted, and it can be prompted to take warning actions, such as avoidance of a fire use and ventilation. If a warning display is displayed in addition to the previous warning mode display, alert the user to a higher level of caution, forbid the use of fire, perform immediate ventilation, etc., and check the cooling storage R1 etc. You may be encouraged to do

In the cooling storage R1 according to the present embodiment, after the control in the leakage warning mode is started, the refrigerant sensor 60 continues to detect a combustible refrigerant for a predetermined time or more (step S7 is YES), and the inside detection when the temperature T _m is below continues the upper limit T _sh in the internal set temperature for a predetermined time or more (step S8 is YES), it cancels the leakage warning mode (step S9), and the control is switched to the normal cooling mode Done. If refrigerant leakage has actually occurred, when most of the combustible refrigerant is lost from the refrigerant pipe 25 and a sufficient cooling effect cannot be obtained, normal cooling can be maintained as described above In this case, it is determined that the refrigerant sensor 60 is not sensitive to the leakage of the refrigerant, and the leakage warning mode is canceled. In such a case, when a warning mode display or warning display is displayed on the display unit 29, these displays are turned off at the same time, and the user can be prompted to release the warning.

  In the cooling storage R1 according to the present embodiment, when it is determined that the refrigerant sensor 60 is sensitized as described above, a sensor sensitization display is displayed on the display unit 29 (step S10). Accordingly, it is possible to notify the user that the refrigerant sensor 60 may be sensitized, and to prompt necessary actions such as inspection of the refrigerant sensor 60. In the sensor sensitization display, a text prompting the inspection of the refrigerant sensor 60 may be displayed on the display unit 29, or may be expressed by a symbol, a numerical value, or the like and confirmed by an attached instruction manual or the like. Also good.

<Second embodiment>
Hereinafter, the cooling storage provided with the refrigeration unit according to the second embodiment will be described based on FIG. 6 and FIG. In addition, since the basic composition of 2nd embodiment is the same as 1st embodiment, it attaches | subjects the same code | symbol about the same structure, and abbreviate | omits description below.

In the present embodiment, a condenser temperature sensor 22T is attached to the condenser 22, and the condenser temperature ( _Tc ) is detected. As shown in FIG. 6, the condenser temperature sensor 22T is connected to the input side of the control unit 40 instead of the condenser fan detection unit 22D, and the condenser detection temperature detected by the condenser temperature sensor 22T. (T _cm ) is sequentially input.

In the present embodiment, even when the control in the leakage warning mode is started (step S3), the warning mode display is not immediately displayed on the display unit 29, but as shown in FIG. 60 refrigerant detection history is referred to (step S24). If there is a refrigerant detection history within a certain time, for example, within the last 4 hours, a warning mode display command is output from the control unit 40, and a warning mode display is displayed on the display unit 29 (YES in step S24). . In addition, when there is no refrigerant | coolant detection log | history within the said time (step S24 is NO), although alert mode display is not carried out, control is performed in leak alert mode.
Further, whether or not to display a warning determination is made by comparing the condenser detected temperature T _cm by condenser temperature sensor 22T, and a predetermined warning temperature T _ce a previously set input (step S25) . When the condenser detection temperature T _cm exceeds the warning temperature T _ce , the condenser 22 is not sufficiently cooled, that is, the condenser fan 22A has failed, and diffusion leakage dilution of the leaked combustible refrigerant has been completed. It is determined that there is a possibility that there is not, and a warning display is displayed on the display unit 29 (step S6).

The effect different from 1st embodiment by this embodiment is demonstrated.
According to the present embodiment, only when it is confirmed that the control unit 40 performs control in the leakage warning mode (step S3) and the refrigerant sensor 60 has a refrigerant detection history (step S3). When S24 is YES, a warning mode display is displayed on the display unit 29 (step S4). Therefore, the rise in the internal temperature T due to other factors, such as opening the door 15 and storing a large amount of high-temperature storage in the storage room 10, misidentifies the occurrence of refrigerant leakage and causes the user to You can reduce the number of prompts.

  According to the technology disclosed in the present specification, in a cooling storage room equipped with a refrigeration apparatus using a flammable refrigerant, if the occurrence of refrigerant leakage is suspected, the condenser fan is always operated to diffuse the flammable refrigerant. By diluting and appropriately displaying the user's attention, the risk of ignition accidents can be reduced and safety can be improved.

<Related technologies>
In starting the control in the leakage warning mode, it can be triggered by refrigerant detection by the refrigerant sensor 60 or reception of a failure signal of the refrigerant sensor 60 (a signal for notifying internal circuit breakage or disconnection). When the refrigerant detection by the refrigerant sensor 60 is triggered, in order to avoid misrecognition, the leakage warning mode is started only when a flammable refrigerant is detected for a certain period of time, for example, 5 seconds or more continuously. Also good. Even in the cooling storage configured to start the control in the leakage warning mode (step S3) with these as a trigger, the control in step S4 or step S24 or lower is applied for the warning mode display, warning display, and release of the leakage warning mode control. can do.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope.

(1) In the above embodiment, an example in which both warning mode display and warning display are possible has been shown. However, the present invention is not limited to this, and only one of them may be displayed. Good. Alternatively, only the control mode may be switched without being displayed.

(2) Although not particularly mentioned in the above embodiment, the defrosting operation can be appropriately performed during the operation in the normal cooling mode and the leakage warning mode. In the above embodiment, the internal temperature detected T _m Upon be maintained near the internal set temperature T _s, and the internal temperature detected T _m and the internal set temperature T _s and the compressor 23 based on the comparison of the cold storage Although what controlled operation | movement of the internal fan 31 grade was described, it is not limited to this. For example, it may be configured to include a timer and appropriately perform a defrosting operation after driving the refrigeration apparatus for a certain period of time. During operation in the leakage warning mode, the operation of the condenser fan 22A is maintained even during the defrosting operation.

(3) The refrigeration apparatus is not limited to the one described in the above embodiment, and may include a plurality of compressors 23, for example. Moreover, it may be configured to cool a plurality of independent storage chambers 10.

(4) The cooling storage R1 disclosed in the present specification is not limited to a vertical two-door refrigerator. For example, the refrigeration unit disclosed in the present specification can also be suitably used in a cooling storage R1 such as a horizontal type or a four-door door. Moreover, a freezing apparatus is not limited to what is arrange | positioned above the storage chamber 10 of cooling storage R1. For example, a machine room may be provided on the side, lower, or rear side of the storage chamber 10 and the compressor 23, the condenser 22 and the like may be disposed.

R1: Cooling storage 19: Internal temperature sensor 22: Condenser 22A: Condenser fan 22D: Condenser fan detector 22T: Condenser temperature sensor 23: Compressor 24: Cooler 25: Refrigerant pipe 29: Display unit 31: Internal fan 40: Control unit 60: Refrigerant sensor

Claims (7)

A storehouse in which stored items are stored;
A compressor, a condenser, and a cooler, which are circulated and connected by a refrigerant pipe enclosing a combustible refrigerant, and cooling the inside of the storage; and
A condenser fan provided in the condenser;
An internal temperature sensor for detecting the temperature in the storage;
A controller that controls the operation of the compressor and the condenser fan in order to maintain the temperature detected by the temperature sensor in the vicinity of a preset temperature set in the refrigerator,
When the state where the inside detection temperature exceeds the warning temperature higher than the inside set temperature continues for a predetermined time, the control unit performs control in the leakage warning mode for maintaining the operation of the condenser fan. Cooling storage. Having an indicator on the outer surface of the cooling storage;
The cooling storage according to claim 1, wherein when the control unit performs control in the leakage warning mode, a warning mode display is displayed on the display unit. Having an indicator on the outer surface of the cooling storage;
A refrigerant sensor for detecting the combustible refrigerant leaked from the refrigerant pipe;
The cooling according to claim 1, wherein when the control unit performs control in the leakage warning mode and the refrigerant sensor has a refrigerant detection history, a warning mode display is displayed on the display unit. Storage. Having an indicator on the outer surface of the cooling storage;
A condenser temperature sensor for detecting the temperature of the condenser;
4. The warning display is displayed on the display unit when the control unit performs control in the leakage warning mode and the temperature of the condenser reaches a predetermined temperature or higher. The cooling storehouse as described in any one. Having an indicator on the outer surface of the cooling storage;
A condenser fan detector for detecting an operating state of the condenser fan;
When the control unit performs control in the leakage warning mode and the condenser fan detection signal is not obtained from the condenser fan detection unit, a warning display is displayed on the display unit. The cooling storage as described in any one of Claims 1 thru | or 3. A refrigerant sensor for detecting the combustible refrigerant leaked from the refrigerant pipe;
After the control unit starts control in the leakage warning mode, the refrigerant sensor continuously detects the flammable refrigerant for a predetermined time or more, and the internal detection temperature is the internal set temperature for the predetermined time. The cooling storage according to any one of claims 1 to 5, wherein the leakage warning mode is canceled when the value continuously falls below. Having an indicator on the outer surface of the cooling storage;
A refrigerant sensor for detecting the combustible refrigerant leaked from the refrigerant pipe;
After the control unit starts control in the leakage warning mode, the refrigerant sensor continuously detects the flammable refrigerant for a predetermined time or more, and the internal detection temperature is the internal set temperature for the predetermined time. The cooling storage according to any one of claims 1 to 5, wherein, when continuously falling below, the leakage warning mode is canceled and a sensor sensitization display is displayed on the display unit.

Images