WO2017109932A1

WO2017109932A1 - Cooling warehouse

Info

Publication number: WO2017109932A1
Application number: PCT/JP2015/086204
Authority: WO
Inventors: 雄明岡部
Original assignee: 三菱電機株式会社
Priority date: 2015-12-25
Filing date: 2015-12-25
Publication date: 2017-06-29
Also published as: JP6735774B2; JPWO2017109932A1; GB2561097B; CN108431529A; GB201806458D0; GB2561097A

Abstract

This cooling warehouse is equipped with: a warehouse body that comprises a heat insulation panel , and is formed with an introduction port through which outside air is introduced into the warehouse and a discharge port through which inside air is discharged to the outside of the warehouse; an introduction cover that is provided to the introduction port so as to open/close the introduction port; a discharge cover that is provided to the discharge port so as to open/close the discharge port; a leakage detection unit that is provided to the interior of the warehouse body so as to detect the leakage of a refrigerant; and a control unit that controls the introduction cover and the discharge cover so as to open the introduction port and the discharge port if the leakage of the refrigerant is detected by the leakage detection unit.

Description

Cooling warehouse

The present invention relates to a cooling warehouse that discharges a leaked refrigerant.

As a cooling warehouse, a prefabricated refrigerator or a prefabricated freezer is known, and a person or a forklift can enter and exit. The inside of the cooling warehouse is cooled by a refrigeration cycle apparatus using a refrigerant, and an indoor unit called a unit cooler is arranged inside the cooling warehouse (see Non-Patent Document 1 and Non-Patent Document 2). ). Conventionally, fluorocarbon refrigerants having low combustibility and low toxicity have been used as refrigerants used in refrigeration cycle apparatuses. In recent years, GWP, that is, a refrigerant with a low global warming potential, has attracted attention from the viewpoint of global environmental conservation. The cooling warehouse has a casing made of a heat insulating panel, and the joint of the heat insulating panel is sealed, so that the airtightness is extremely high. The fluorocarbon refrigerant containing a slightly flammable refrigerant has a specific gravity higher than that of air, and when the refrigerant leaks from the indoor unit, the refrigerant may stay inside the cooling warehouse.

Patent Document 1 discloses a cooling warehouse equipped with a refrigeration cycle apparatus that uses a low-flammable refrigerant having a low GWP. In Patent Document 1, when the refrigerant leaks, the leaked refrigerant is stored in the outdoor unit.

Japanese Patent No. 3109500

However, the cooling warehouse disclosed in Patent Document 1 does not have a casing made of a heat insulating panel. A cooling warehouse provided with a housing formed of a heat insulating panel has extremely high airtightness, and thus it is desired to discharge the refrigerant more reliably.

The present invention has been made to solve the above-described problems, and provides a cooling warehouse that easily discharges a refrigerant when the refrigerant leaks in a cooling warehouse including a housing formed of a heat insulating panel. To do.

The cooling warehouse according to the present invention is composed of a heat insulating panel, and is provided with a warehouse body in which an introduction port for introducing outside air and a discharge port for discharging air inside the warehouse are respectively formed, and the introduction port is opened and closed. And a discharge lid that opens and closes the discharge port, a leak detection unit that is provided inside the warehouse body and detects a refrigerant leak, and a leak detection unit detects a refrigerant leak. A control unit that controls the introduction lid and the discharge lid to open the introduction port and the discharge port.

According to the present invention, when the leakage of the refrigerant is detected, the control unit opens the inlet and the outlet, so that the air introduced from the inlet is discharged from the outlet along with the leaked refrigerant. For this reason, even in a cooling warehouse including a warehouse main body configured with a heat insulating panel, the refrigerant can be easily discharged when the refrigerant leaks.

It is sectional drawing which shows the cooling warehouse 100 which concerns on Embodiment 1 of this invention. It is a circuit diagram which shows the refrigerating-cycle apparatus 10 in Embodiment 1 of this invention. It is sectional drawing which shows the cooling warehouse 100 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the cooling warehouse 200 which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the cooling warehouse 200 which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the cooling warehouse 300 which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the cooling warehouse 300 which concerns on Embodiment 3 of this invention.

Embodiment 1 FIG.
Hereinafter, an embodiment of a cooling warehouse according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a cooling warehouse 100 according to Embodiment 1 of the present invention. The cooling warehouse 100 will be described with reference to FIG. As shown in FIG. 1, the cooling warehouse 100 includes a warehouse body 1, an introduction lid 32 a, an introduction motor 32 b, a discharge lid 31 a, a discharge motor 31 b, a leak detection unit 41, and a control unit 42. Yes. The refrigeration cycle apparatus 10 is provided in the cooling warehouse 100.

The warehouse body 1 is composed of a heat insulating panel 1f and is formed with an introduction port 32 and a discharge port 31. For example, the warehouse body 1 is a rectangular parallelepiped casing that forms the outer shell of the cooling warehouse 100. Moreover, the circumference | surroundings of the warehouse main body 1 are sealed with several heat insulation panels 1f, for example, are prefabricated refrigerators. The warehouse body 1 is provided with a door 1e through which a person 2 or a luggage 3 enters and exits. The inlet 32 is an opening for introducing outside air into the cooling warehouse 100, and is formed on the wall surface 1b between the ceiling surface 1c of the

warehouse body

1 and 1/3 of the height of the warehouse body 1, for example. Yes. The introduction port 32 may be formed in the ceiling surface 1 c of the warehouse body 1. The discharge port 31 is an opening for discharging the internal air to the outside of the cooling warehouse 100, and is formed on the wall surface 1b between the floor surface 1a of the

warehouse body

1 and 1/3 of the height of the warehouse body 1, for example. Yes. The discharge port 31 may be formed in the floor surface 1a of the warehouse body 1.

The introduction lid 32 a is provided at the introduction port 32 and opens and closes the introduction port 32. The introduction motor 32b is provided on the introduction lid 32a and drives the introduction lid 32a to open and close. The discharge lid 31 a is provided at the discharge port 31 and opens and closes the discharge port 31. The discharge motor 31b is provided on the discharge lid 31a and drives the discharge lid 31a to open and close.

FIG. 2 is a circuit diagram showing the refrigeration cycle apparatus 10 according to Embodiment 1 of the present invention. As shown in FIG. 2, the refrigeration cycle apparatus 10 includes a refrigerant circuit in which, for example, a compressor 11, an outdoor heat exchanger 12, an expansion unit 13, and an indoor heat exchanger 14 are connected by a pipe 24, and refrigerant flows. Yes. The refrigeration cycle apparatus 10 includes an outdoor unit 21 and an indoor unit 22, and the outdoor unit 21 and the indoor unit 22 are connected by a pipe 24. The pipe 24 includes a pipe 24 a located outside the warehouse from the outdoor unit 21 to the warehouse main body 1 and a pipe 24 b located inside the warehouse from the warehouse main body 1 to the indoor unit 22. The outdoor unit 21 is installed outside the cooling warehouse 100, and for example, the compressor 11 and the outdoor heat exchanger 12 are installed inside the outdoor unit 21. The indoor unit 22 is installed inside the cooling warehouse 100, and for example, the expansion unit 13 and the indoor heat exchanger 14 are installed inside the indoor unit 22.

The compressor 11 compresses the refrigerant. The outdoor heat exchanger 12 condenses the refrigerant by exchanging heat between the outdoor air and the refrigerant. The expansion part 13 expands and depressurizes the refrigerant. The indoor heat exchanger 14 evaporates the refrigerant by exchanging heat between the indoor air and the refrigerant. In addition, the refrigerant | coolant used for the refrigerating-cycle apparatus 10 is a slightly combustible refrigerant | coolant, for example. Moreover, in this Embodiment 1, although the indoor unit 22 is installed in the ceiling surface 1c inside the cooling warehouse 100, the installation location may be the wall surface 1b or the floor surface 1a. Further, in the first embodiment, two indoor units 22 are installed, but the number of installed units may be one or three or more.

Here, the operation of the cooling operation of the refrigeration cycle apparatus 10 will be described. The refrigerant is sucked into the compressor 11 of the outdoor unit 21, compressed by the compressor 11, and discharged in the state of high-temperature and high-pressure gas. The discharged refrigerant flows into the outdoor heat exchanger 12. The refrigerant that has flowed into the outdoor heat exchanger 12 is condensed by exchanging heat with outdoor air. The condensed refrigerant flows into the expansion unit 13 of each indoor unit 22 and is expanded and depressurized by the expansion unit 13. The decompressed refrigerant flows into the indoor heat exchanger 14. The refrigerant that has flowed into the indoor heat exchanger 14 is heat-exchanged with the indoor air and evaporated. At that time, the internal air is cooled and the inside of the cooling warehouse 100 is cooled. Thereafter, the evaporated refrigerant is sucked into the compressor 11. In the refrigeration cycle apparatus 10, a flow path switching device may be provided. In this case, heating operation can also be performed.

The leakage detection unit 41 is provided inside the warehouse body 1 and detects refrigerant leakage. The leak detection unit 41 is provided, for example, in a space between the floor surface 1a of the

warehouse body

1 and 1/3 of the height of the warehouse body 1. Thereby, when the specific gravity of a refrigerant | coolant is higher than the specific gravity of the air in a store | warehouse | chamber and the refrigerant | coolant stays in the lower part inside the cooling warehouse 100, the leak detection part 41 can detect the leak of a refrigerant | coolant correctly. In addition, the leak detection part 41 detects the refrigerant | coolant which leaked, for example from the indoor unit 22 or the piping 24b arrange | positioned indoors. Moreover, the leak detection part 41 may be provided in the space from the ceiling surface 1c of the warehouse main body 1 to 1/3 of the height of the warehouse main body 1, for example. Thereby, when the specific gravity of a refrigerant | coolant is lower than the specific gravity of the air in a store | warehouse | chamber and a refrigerant | coolant stagnates in the inside of the cooling warehouse 100, the leak detection part 41 can detect the leak of a refrigerant | coolant correctly.

The control unit 42 controls the introduction lid 32a and the discharge lid 31a to open the introduction port 32 and the discharge port 31 when the leakage of the refrigerant is detected by the leakage detection unit 41. The controller 42 has contacts (not shown) connected to the introduction motor 32b and the discharge motor 31b. And when the leak detection part 41 detects the leakage of a refrigerant | coolant, the control part 42 closes a contact and operates the induction motor 32b and the discharge motor 31b. Thereby, the introduction lid 32a and the discharge lid 31a are opened and closed, and the introduction port 32 and the discharge port 31 are opened. The introduction lid 32a and the discharge lid 31a may be driven to open and close at the same time, or may be driven to open and close at different timings.

FIG. 3 is a cross-sectional view showing the cooling warehouse 100 according to Embodiment 1 of the present invention. Next, the operation of the control unit 42 will be described. In the cooling warehouse 100, the refrigeration cycle apparatus 10 is normally operating, and the indoor air inside the cooling warehouse 100 is cooled by the indoor heat exchanger 14 provided inside the indoor unit 22. Moreover, the control part 42 opens the contact point connected to the introduction motor 32b and the discharge motor 31b, and stops the introduction motor 32b and the discharge motor 31b. Therefore, the introduction lid 32a and the discharge lid 31a are closed, and the introduction port 32 and the discharge port 31 are shielded.

In the inside of the cooling warehouse 100, when leakage of the refrigerant is detected by the leakage detection unit 41, the control unit 42 closes the contacts connected to the introduction motor 32b and the discharge motor 31b, and connects the introduction motor 32b and the discharge motor 31b. Make it work. Therefore, the introduction lid 32a and the discharge lid 31a are opened, and the introduction port 32 and the discharge port 31 are opened. At that time, the control unit 42 stops the operation of the indoor unit 22 and the outdoor unit 21.

According to the first embodiment, when the leakage of the refrigerant is detected, the control unit 42 opens the introduction lid 32a and the discharge lid 31a so as to pass through the introduction path 71 from the introduction port 32 as shown in FIG. The outside air introduced in this manner is discharged from the discharge port 31 through the discharge path 72 together with the leaked refrigerant 6. For this reason, also in the cooling warehouse 100 provided with the warehouse main body 1 comprised with the heat insulation panel 1f, when a refrigerant | coolant leaks, a refrigerant | coolant can be discharged | emitted easily. Further, when the refrigerant leaks, the refrigerant can be easily discharged without requiring complicated control such as opening and closing a plurality of valves. Moreover, since the operation of the indoor unit 22 is stopped, the leaked refrigerant and the internal air are not stirred. Thereby, the refrigerant can be quickly discharged to the outside of the cooling warehouse 100.

In the case of a plurality of cooling warehouses provided with refrigeration cycle devices in which a plurality of indoor units are connected to a single outdoor unit, if refrigerant leaks from one indoor unit, the volume inside the cooling warehouse is compared with A large amount of refrigerant leaks. Here, when the cooling capacity of the outdoor unit is the same, the total capacity of the cooling warehouse that can be cooled is the same. That is, the capacity of the cooling warehouse when cooling one cooling warehouse is larger than the capacity of each cooling warehouse when cooling a plurality of cooling warehouses. Accordingly, a plurality of cooling warehouses provided with a refrigeration cycle apparatus in which a plurality of indoor units are connected to a single outdoor unit is a refrigeration cycle apparatus in which a single indoor unit is connected to an outdoor unit having the same cooling capacity. Compared to the cooling warehouse where is provided, the concentration of the leaking refrigerant is high.

Here, the value obtained by dividing the amount of refrigerant leaking by the internal volume of the refrigerator is taken as the indoor refrigerant concentration. In the case of cooling one cooling warehouse and the case of cooling a plurality of cooling warehouses, the amount of refrigerant until the refrigerant shortage is equal. In addition, when cooling one cooling warehouse and when cooling multiple cooling warehouses, the total capacity of the cooling warehouse is the same. The capacity is small. Accordingly, the indoor refrigerant concentration is higher when cooling a plurality of cooling warehouses than when cooling one cooling warehouse.

Conventionally, a technique for storing a refrigerant in an outdoor unit when a leaked refrigerant is detected has been disclosed. However, when cooling a plurality of cooling warehouses provided with a refrigeration cycle apparatus in which a plurality of indoor units are connected to one outdoor unit, it takes time to detect a leaked refrigerant in each cooling warehouse. . For this reason, the refrigerant | coolant of the leaking refrigerant | coolant detection lower limit amount stays in one cooling warehouse, and the density | concentration of a refrigerant | coolant becomes high. On the other hand, in the first embodiment, when the leakage of the refrigerant is detected, the control unit 42 opens the introduction lid 32a and the discharge lid 31a. Therefore, in each cooling warehouse 100 when cooling the plurality of cooling warehouses 100 provided with the refrigeration cycle apparatus 10 to which the plurality of indoor units 22 are connected to one outdoor unit 21, the concentration of the leaked refrigerant is also low. Before it becomes high, the leaked refrigerant can be discharged to the outside.

The introduction port 32 is formed between the ceiling surface 1c of the warehouse

main body

1 and 1/3 of the height of the warehouse main body 1. The discharge port 31 extends from the floor surface 1a of the warehouse main body 1 to the warehouse. It is formed up to 1/3 of the height of the main body 1. Since the inside of the cooling warehouse 100 is cooled by the refrigeration cycle apparatus 10, the inside air is at a lower temperature than the outside air and has a high specific gravity. For example, the specific gravity of the air inside the cabinet is 1.3 kg / m ³ when the dry bulb temperature is 5 ° C. and the relative humidity is 50%, and the specific gravity of the outside air is 25 ° C. at the dry bulb temperature and 60% relative humidity. %, It is 1.2 kg / m ³ . Accordingly, the internal air has a higher specific gravity so that when the introduction port 32 and the discharge port 31 are opened, the internal air descends and is exhausted, and the external air is introduced by the amount that the internal air is lowered and discharged. 32.

Here, in the first embodiment, the specific gravity of the refrigerant is about 21.0 kg / m ³ when the dry bulb temperature is 5 ° C. and the relative humidity is 50%. Therefore, the refrigerant stays in the lower part of the cooling warehouse 100 due to the specific gravity difference between the refrigerant and the air in the warehouse. Thereby, when the discharge port 31 formed in the floor surface 1a of the warehouse main body 1 or the wall surface 1b from the floor surface 1a to 1/3 of the height of the warehouse main body 1 is opened, it stays on the floor surface. Preferentially discharged from the refrigerant. Thus, in the first embodiment, the refrigerant can be discharged to the outside of the cooling warehouse 100 more quickly.

The control unit 42 further includes an introduction motor 32b provided on the introduction lid 32a for driving the opening / closing of the introduction lid 32a, and a discharge motor 31b provided on the discharge lid 31a for driving the opening / closing of the discharge lid 31a. When the leakage detection unit 41 detects a refrigerant leak, the contact is closed and the introduction motor 32b and the discharge motor 31b are operated when the leak detection unit 41 detects a refrigerant connected to the motor 32b and the discharge motor 31b. Thereby, the introduction lid 32a and the discharge lid 31a are opened, and the introduction port 32 and the discharge port 31 are opened.

A plurality of heat insulation panels 1f are sealed around the warehouse body 1. Thus, the cooling warehouse 100 of this Embodiment 1 is a prefabricated refrigerator etc. with high airtightness, for example.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view showing a cooling warehouse 200 according to Embodiment 2 of the present invention. The second embodiment is different from the first embodiment in that the cooling warehouse 200 includes a blower 51. In the second embodiment, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The description will focus on differences from the first embodiment.

As shown in FIG. 4, the blower 51 is provided at the introduction port 32 in the warehouse body 1. The blower 51 is attached in such a direction that outside air is introduced into the cooling warehouse 200 from the outside of the cooling warehouse 200. The introduction lid 232a is a partition wall that separates the inside of the cooling warehouse 100 from the outside of the cooling warehouse 100 while the blower 51 is stopped, and is a pressure type or an electric type. The control unit 42 operates the blower 51 when leakage of the refrigerant is detected by the leakage detection unit 41.

FIG. 5 is a cross-sectional view showing a cooling warehouse 200 according to Embodiment 2 of the present invention. Next, the operation of the control unit 42 will be described. In the cooling warehouse 200, the refrigeration cycle apparatus 10 is normally operating, and the indoor air inside the cooling warehouse 100 is cooled by the indoor heat exchanger 14 provided inside the indoor unit 22. Further, the control unit 42 opens contacts connected to the introduction motor 32b, the discharge motor 31b, and the blower 51, and stops the introduction motor 32b, the discharge motor 31b, and the blower 51. Therefore, the introduction lid 32a and the discharge lid 31a are closed, and the introduction port 32 and the discharge port 31 are shielded.

In the inside of the cooling warehouse 200, when leakage of the refrigerant is detected by the leakage detection unit 41, the control unit 42 closes the contacts connected to the introduction motor 32b, the discharge motor 31b, and the blower 51, and introduces the introduction motor 32b, the discharge. The electric motor 31b and the blower 51 are operated. Accordingly, the introduction lid 232a and the discharge lid 31a are opened, and the introduction port 32 and the discharge port 31 are opened. Moreover, the air blower 51 operates. At that time, the control unit 42 stops the operation of the indoor unit 22 and the outdoor unit 21.

According to the second embodiment, the blower 51 provided at the introduction port 32 in the warehouse body 1 is further provided. And when the leakage of a refrigerant | coolant is detected, the control part 42 opens the introduction cover 32a and the discharge cover 31a, and operates the air blower 51. FIG. Further, the blower 51 is attached in such a direction as to introduce outside air into the cooling warehouse 100 from the outside of the cooling warehouse 100. For this reason, as shown in FIG. 5, the outside air is introduced from the introduction port 32 by the blower 51, and the inside of the cooling warehouse 100 is pressurized to a positive pressure.

Then, the inside of the cabinet is kept at a positive pressure by the static pressure generated by the blower 51, and the refrigerant 6 staying on the floor surface is discharged from the discharge port 31 via the discharge path 72. Therefore, the refrigerant can be discharged more easily. Moreover, since the operation of the indoor unit 22 is stopped, the leaked refrigerant and the internal air are not stirred. Thereby, the refrigerant can be quickly discharged to the outside of the cooling warehouse 200.

Note that the blower 51 may be attached in a direction to discharge the air in the warehouse from the inside of the cooling warehouse 200 to the outside of the cooling warehouse 200. When the specific gravity of the refrigerant is lower than the specific gravity of the internal air and the refrigerant stays in the upper part of the cooling warehouse 200, the outside air taken in from the discharge port 31 is stored together with the leaked refrigerant by the static pressure of the blower 51. It becomes internal air and exits from the inlet 32. In this case, the introduction port 32 functions as an opening for discharging the internal air, and the discharge port 31 functions as an opening for introducing outside air.

Also, the control unit 42 may be configured to operate the blower 51 with the rotation direction of the blower 51 reversed. When the specific gravity of the refrigerant is lower than the specific gravity of the internal air and the refrigerant stays in the upper part of the cooling warehouse 200, the outside air taken in from the discharge port 31 is stored together with the leaked refrigerant by the static pressure of the blower 51. It becomes internal air and exits from the inlet 32. In this case, the introduction port 32 functions as an opening for discharging the internal air, and the discharge port 31 functions as an opening for introducing outside air.

Note that the blower 51 may be provided at the discharge port 31 in the warehouse body 1. In this case, the blower 51 is attached in a direction to discharge the internal air from the inside of the cooling warehouse 200 to the outside of the cooling warehouse 200. When the specific gravity of the refrigerant is higher than the specific gravity of the air inside the warehouse and the refrigerant stays in the lower part of the inside of the cooling warehouse 200, the air inside the warehouse is quickly discharged without using the static pressure generated by the blower 51. . Thus, by further providing the blower 51 provided at the introduction port 32 or the discharge port 31 in the warehouse body 1, the refrigerant can be quickly discharged to the outside of the cooling warehouse 200.

Embodiment 3 FIG.
FIG. 6 is a cross-sectional view showing a cooling warehouse 300 according to Embodiment 3 of the present invention. The third embodiment is different from the second embodiment in that the discharge lid 331a is an atmospheric pressure adjusting valve. In the third embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted. The difference from the first and second embodiments will be mainly described.

As shown in FIG. 6, the discharge lid 331a is an atmospheric pressure adjusting valve, and the atmospheric pressure adjusting valve opens the outlet 31 when a difference occurs between the pressure of outside air and the pressure of inside air. . When the door 1e of the cooling warehouse 300 is opened and closed, if warm outside air enters the inside of the cooling warehouse 300 and is rapidly cooled, the pressure of the air in the warehouse may decrease and the door 1e may not open. is there. Further, when the refrigeration cycle apparatus 10 performs the defrosting operation, when the heater is used to defrost, if the air heated by the heater circulates in the chamber, the pressure of the chamber air rapidly increases, and the door 1e and the cooling are performed. A panel or the like provided in the warehouse 300 may be broken or deformed by pressure. The air pressure adjusting valve is configured to adjust the air pressure inside the cooling warehouse 300 to prevent the door 1e from being opened and to destroy or deform the door 1e and the panel.

FIG. 7 is a cross-sectional view showing a cooling warehouse 300 according to Embodiment 3 of the present invention. Next, the operation of the control unit 42 will be described. In the cooling warehouse 300, the refrigeration cycle apparatus 10 is normally operating, and the indoor air inside the cooling warehouse 300 is cooled by the indoor heat exchanger 14 provided inside the indoor unit 22. Moreover, the control part 42 opens the contact point connected to the introduction motor 32b and the blower 51, and stops the introduction motor 32b and the blower 51. Therefore, the introduction lid 32a is closed and the introduction port 32 is shielded. Further, the discharge lid 331a, which is an atmospheric pressure adjusting valve, is closed because the pressure of the outside air and the pressure of the inside air are equal, and the discharge port 31 is shielded.

In the inside of the cooling warehouse 300, when leakage of the refrigerant is detected by the leakage detection unit 41, the control unit 42 closes the contact point connected to the introduction motor 32b and the blower 51 and operates the introduction motor 32b and the blower 51. . Accordingly, the introduction lid 32a is opened and the introduction port 32 is opened. Moreover, the air blower 51 operates. When the blower 51 is operated, outside air is introduced from the inlet 32, and the inside of the cooling warehouse 300 is pressurized to a positive pressure. And the discharge lid 331a which is an atmospheric pressure adjusting valve is pushed and opened by the static pressure generated by the blower 51. Thereby, the discharge port 31 is opened. At that time, the control unit 42 stops the operation of the indoor unit 22.

According to the third embodiment, the opening is formed in the warehouse body 1 and provided in the discharge port 31 that is the opening, and there is a difference between the pressure of the outside air and the pressure of the inside air. In this case, a discharge lid 331a that opens the discharge port 31 that is an opening is further provided. The discharge lid 331a is a pressure adjusting valve that opens the discharge port 31 when a difference occurs between the pressure of the outside air and the pressure of the inside air. And the control part 42 opens the introduction cover 32a, and operates the air blower 51, when the leakage of a refrigerant | coolant is detected. The blower 51 is attached in such a direction as to introduce the outside air into the cooling warehouse 300 from the outside of the cooling warehouse 300. For this reason, as shown in FIG. 7, the outside air is introduced from the inlet 32 by the blower 51, and the inside of the cooling warehouse 300 is pressurized to a positive pressure. Further, the discharge lid 331a, which is an atmospheric pressure adjusting valve, is pushed and opened by the static pressure generated by the blower 51. Thereby, the discharge port 31 is opened.

Then, using the static pressure generated by the blower 51, the outside air introduced from the introduction port 32 through the introduction route 71 is discharged from the discharge port 31 through the discharge route 72 together with the leaked refrigerant 6. . Therefore, the refrigerant can be discharged more easily. Moreover, since the operation of the indoor unit 22 is stopped, the leaked refrigerant and the internal air are not stirred. Thereby, the refrigerant can be quickly discharged to the outside of the cooling warehouse 300.

It should be noted that the blower 51 may be attached in such a direction as to discharge the internal air from the inside of the cooling warehouse 300 to the outside of the cooling warehouse 300. When the specific gravity of the refrigerant is lower than the specific gravity of the internal air and the refrigerant stays in the upper part of the cooling warehouse 300, the outside air taken in from the discharge port 31 is introduced by the static pressure of the blower 51 together with the leaked refrigerant. Get out of mouth 32. In this case, the introduction port 32 functions as an opening for discharging the internal air, and the discharge port 31 functions as an opening for introducing outside air. Further, the atmospheric pressure adjusting valve may be provided separately from the discharge lid, not the discharge lid 331a.

Also, the control unit 42 may be configured to operate the blower 51 with the rotation direction of the blower 51 reversed. When the specific gravity of the refrigerant is lower than the specific gravity of the air in the warehouse and the refrigerant stays in the upper part of the cooling warehouse 300, the outside air taken in from the discharge port 31 is stored together with the leaked refrigerant by the static pressure of the blower 51. It becomes internal air and exits from the inlet 32. In this case, the introduction port 32 functions as an opening for discharging the internal air, and the discharge port 31 functions as an opening for introducing outside air. Note that the discharge lid 331a, which is a pressure adjusting valve, functions as an opening for introducing outside air.

The blower 51 is provided at the discharge port 31 in the warehouse body 1, and the discharge lid 331 a is an atmospheric pressure adjustment valve that opens the introduction port 32 when a difference occurs between the pressure of the outside air and the pressure of the inside air. It may be. In this case, the blower 51 is attached in a direction for discharging the internal air from the inside of the cooling warehouse 300 to the outside of the cooling warehouse 300. When the specific gravity of the refrigerant is higher than the specific gravity of the air inside the warehouse and the refrigerant stays in the lower part of the inside of the cooling warehouse 300, the discharge port 31 can be quickly used without stirring the air inside the warehouse using the static pressure generated by the blower 51. Discharged from. Thus, the introduction lid 32a or the discharge lid 331a is an atmospheric pressure adjusting valve that opens the introduction port 32 or the discharge port 31 when a difference occurs between the pressure of the outside air and the pressure of the inside air. Thereby, it becomes unnecessary to attach the discharge lid 331a separately.

In the above embodiment, the control unit 42 closes the contacts connected to the introduction motor 32b, the discharge motor 31b, and the blower 51, but is connected to the introduction motor 32b, the discharge motor 31b, and the blower 51. The contact may be shared with the refrigerant leakage abnormality signal contact. Thereby, the contact can be used for, for example, a warning lamp lighting output or a remote abnormality signal reporting output.

1 warehouse body, 1a floor surface, 1b wall surface, 1c ceiling surface, 1e door, 1f heat insulation panel, 2 persons, 3 luggage, 6 refrigerant, 10 refrigeration cycle equipment, 11 compressor, 12 outdoor heat exchanger, 13 expansion section, 14 indoor heat exchanger, 21 outdoor unit, 22 indoor unit, 24, 24a, 24b piping, 31 outlet, 31a outlet lid, 31b outlet motor, 32 inlet, 32a inlet lid, 32b inlet motor, 41 leak detector, 42 control unit, 51 blower, 71 introduction route, 72 discharge route, 100 cooling warehouse, 200 cooling warehouse, 232a introduction lid, 300 cooling warehouse, 331a discharge lid.

Claims

A warehouse body composed of a heat insulating panel and formed with an inlet for introducing outside air and an outlet for discharging air inside the warehouse,
An introduction lid provided at the introduction port for opening and closing the introduction port;
A discharge lid provided at the discharge port for opening and closing the discharge port;
A leakage detector provided inside the warehouse body for detecting refrigerant leakage;
A controller that controls the introduction lid and the discharge lid to open the introduction port and the discharge port when the leakage of the refrigerant is detected by the leakage detection unit;
A cooling warehouse comprising.
The introduction port is formed between the ceiling surface of the warehouse body and 1/3 of the height of the warehouse body,
The cooling warehouse according to claim 1, wherein the discharge port is formed between a floor surface of the warehouse body and a third of a height of the warehouse body.
An introduction motor provided on the introduction lid and configured to open and close the introduction lid;
A discharge motor provided on the discharge lid and configured to open and close the discharge lid; and
The controller is
Having contacts connected to the introduction motor and the discharge motor;
The cooling warehouse according to claim 1 or 2, wherein when the leakage of the refrigerant is detected by the leakage detection unit, the contact is closed and the introduction motor and the discharge motor are operated.
The cooling warehouse according to any one of claims 1 to 3, further comprising a blower provided at the introduction port or the discharge port in the warehouse body.
An opening is formed in the warehouse body,
The pressure control valve according to any one of claims 1 to 4, further comprising an air pressure adjusting valve that is provided in the opening and opens the opening when a difference occurs between the pressure of outside air and the pressure of inside air. Cooling warehouse.
Around the warehouse body,
The cooling warehouse according to any one of claims 1 to 5, wherein a plurality of the heat insulating panels are sealed.