WO2019103045A1

WO2019103045A1 - Air-tightness evaluation device, in-compartment air conditioning device, and refrigeration device

Info

Publication number: WO2019103045A1
Application number: PCT/JP2018/043008
Authority: WO
Inventors: 秀徳松井; 紀考亀井; 直宏田中
Original assignee: ダイキン工業株式会社
Priority date: 2017-11-22
Filing date: 2018-11-21
Publication date: 2019-05-31
Also published as: JP2019095448A

Abstract

An air-tightness evaluation device (130) is incorporated in an in-compartment air conditioning device (30) that adjusts the composition of in-compartment air of a transport container (1), which is a storage compartment. The air-tightness evaluation device (130) is constituted of: an air pressure adjustment apparatus (131); a third pressure sensor (103); and an air-tightness evaluation unit of a controller (110). The air pressure adjustment apparatus (131) is an air pump (36) that supplies air into the transport container (1). The third pressure sensor (103) measures the air pressure within the transport container (1). The air-tightness evaluation unit of the controller (110) evaluates the air-tightness of the transport container (1) on the basis of a measurement value of the transport container (1).

Description

Airtightness evaluation device, internal air conditioning device, and refrigeration device

The present invention relates to an airtightness evaluation device for evaluating the airtightness of a storage, and an in-compartment air conditioning device and a refrigeration system provided with the airtightness evaluation device.

There is known a technique for adjusting the oxygen concentration of air in a storage container for storing produce etc. to be lower than the oxygen concentration of the atmosphere for the purpose of suppressing a decrease in freshness of the produce etc. Patent Document 1 discloses an in-compartment environment control system for supplying air having a low oxygen concentration to the inside of a transport container in order to lower the oxygen concentration of air inside the transport container lower than the oxygen concentration of the atmosphere. It is done. Further, this in-compartment environment control system includes a refrigerant circuit that performs a refrigeration cycle, and also performs temperature control of the in-compartment air.

Japanese Patent Application Laid-Open No. 08-000166

By the way, storage containers, such as a transport container, do not always ensure the airtightness. Also, for example, containers for sea transport may become progressively less airtight during repeated use processes. If the air tightness of the storage is low, outside air (i.e., the atmosphere) may enter the inside of the storage through the gap of the storage. When the amount of outside air entering the inside of the storage increases, the composition of the inside air (for example, the oxygen concentration of the inside air) can not reach the target composition, Temperature may not be reduced to the target temperature.

As described above, ensuring the airtightness of the storage is important in appropriately controlling the storage environment of the storage. However, no device for evaluating the tightness of storage has ever existed.

This invention is made in view of this point, The objective is to provide the apparatus which evaluates the airtightness of storage.

A first aspect of the present disclosure is directed to an airtightness evaluation device, wherein air is supplied to the storage (1) or the storage (1) in order to make the air pressure in the storage (1) different from the atmospheric pressure. An air pressure regulator (131) for exhausting air from the air pressure sensor (103, 65, 45) for measuring the air pressure in the storage (1), and the air pressure during or after operation of the air pressure regulator (131) An evaluation unit (116) configured to perform an evaluation operation to evaluate the airtightness of the storage (1) based on the measurement values of the sensors (103, 65, 45).

In the first aspect, the air pressure in the storage case (1) becomes positive pressure or negative pressure by operating the air pressure adjusting device (131). When the pressure in the storage case (1) is a positive pressure, the air tightness of the storage case (1) is lower, the air flowing out of the storage case (1) through the gap of the storage case (1) Flow rate will increase. In addition, when the air pressure inside the storage case (1) is a negative pressure, the lower the airtightness of the storage case (1), the more it flows into the inside of the storage case (1) through the gap of the storage case (1) The flow rate of air increases. For this reason, the lower the airtightness of the storage case (1), the greater the influence on the air pressure in the storage case (1). Therefore, the evaluation unit (116) evaluates the airtightness of the storage case (1) based on the measurement values of the air pressure sensor (103, 65, 45) during or after the operation of the air pressure adjustment device (131).

According to a second aspect of the present disclosure, in the first aspect, the evaluation unit (116) measures the airtightness of the storage (1) based on the measurement values of the pressure sensor (103, 65, 45). It is comprised so that the operation | movement which judges the success or failure of the evaluation condition which shows that it has reached to the reference level may be performed as said evaluation operation | movement.

In the second aspect, the evaluation unit (116) in the evaluation operation is an air pressure sensor (103, 65, 45) of the air pressure adjustment device (131) during or after operation of the air pressure adjustment device (131). Judge based on the measured value. Then, the evaluation unit (116) determines that the airtightness of the storage case (1) has reached the reference level when the evaluation condition is satisfied, and the airtightness of the storage case (1) is the reference level when the evaluation condition is not satisfied. It is determined that has not been reached.

According to a third aspect of the present disclosure, in the second aspect, the evaluation unit (116) determines, in the evaluation operation, success or failure of one of a plurality of the evaluation conditions different from each other in the reference level. An operator is provided with an input unit (113) for inputting information designating one of the plurality of evaluation conditions which are judged to be successful in the evaluation operation among the plurality of evaluation conditions.

In the third aspect, the airtightness evaluation device (130) is provided with an input unit (113). The information input to the input unit (113) by the operator designates one of a plurality of evaluation conditions having different reference levels. In the evaluation operation, the evaluation unit (116) determines whether the evaluation condition specified by the information input by the operator to the input unit (113) is met.

According to a fourth aspect of the present disclosure, in any one of the first to third aspects, the evaluation unit (116) operates the air pressure adjustment device (131) as the evaluation operation, and the air pressure sensor When the measured value of (103, 65, 45) reaches the reference pressure, the air pressure adjusting device (131) is stopped, and measurement of the air pressure sensor (103, 65, 45) after stopping the air pressure adjusting device (131) It is comprised so that the operation | movement which evaluates the airtightness of the said storage (1) based on the change of a value may be performed.

In the evaluation operation of the fourth aspect, the evaluation unit (116) operates the air pressure adjustment device (131) to change the air pressure in the storage case (1), and measures the air pressure sensor (103, 65, 45) When the value reaches the reference pressure, the air pressure regulator (131) is stopped. When the air pressure in the storage case (1) is a positive pressure, the lower the air tightness of the storage case (1), the measurement value of the pressure sensor (103, 65, 45) after stopping the pressure control device (131) The rate of decline is faster. In addition, when the air pressure in the storage case (1) is negative pressure, the lower the air tightness of the storage case (1), the measurement of the air pressure sensor (103, 65, 45) after stopping the air pressure adjustment device (131) The rate of increase in value is faster. Therefore, the evaluation unit (116) evaluates the airtightness of the storage case (1) based on the change in the measurement value of the air pressure sensor (103, 65, 45) after the air pressure adjustment device (131) is stopped.

According to a fifth aspect of the present disclosure, in any one of the first to third aspects, the evaluation unit (116) controls the air pressure adjustment device (131) as the evaluation operation to control the air pressure. After the measured value of the sensor (103, 65, 45) is maintained in the predetermined pressure range for a predetermined time, the measured value of the measured pressure sensor (103, 65, 45) during stoppage of the pressure adjusting device (131) It is comprised so that the operation | movement which evaluates the airtightness of the said storage (1) based on a change may be performed.

In the evaluation operation of the fifth aspect, the evaluation unit (116) controls the air pressure adjusting device (131) to keep the measured value of the air pressure sensor (103, 65, 45) within a predetermined pressure range for a predetermined time. keep. When the air pressure in the storage case (1) is a positive pressure, the lower the air tightness of the storage case (1), the measurement value of the pressure sensor (103, 65, 45) after stopping the pressure control device (131) The rate of decline is faster. In addition, when the air pressure in the storage case (1) is negative pressure, the lower the air tightness of the storage case (1), the measurement of the air pressure sensor (103, 65, 45) after stopping the air pressure adjustment device (131) The rate of increase in value is faster. Therefore, after the evaluation unit (116) keeps the measurement values of the air pressure sensor (103, 65, 45) in the predetermined pressure range for a predetermined time, the air pressure adjustment device (131) stops the pressure sensor The airtightness of the storage (1) is evaluated based on the change in the measured value of 103, 65, 45).

According to a sixth aspect of the present disclosure, in any one of the first to third aspects, the evaluation unit (116) operates the air pressure adjustment device (131) as the evaluation operation to adjust the air pressure. An operation is performed to evaluate the airtightness of the storage (1) based on the change in the measurement value of the air pressure sensor (103, 65, 45) during the operation of the device (131).

In the evaluation operation of the sixth aspect, the evaluation unit (116) operates the air pressure adjustment device (131) to change the air pressure in the storage case (1). When the pressure in the storage case (1) is a positive pressure, the lower the air tightness of the storage case (1), the measurement value of the pressure sensor (103, 65, 45) during operation of the pressure control device (131) Rising speed slows down. Moreover, when the air pressure in the storage case (1) is negative pressure, the lower the air tightness of the storage case (1), the measurement of the air pressure sensor (103, 65, 45) during operation of the air pressure adjustment device (131) The rate of decrease in value becomes slower. Therefore, the evaluation unit (116) evaluates the airtightness of the storage case (1) based on the change in the measurement value of the air pressure sensor (103, 65, 45) during the operation of the air pressure adjustment device (131).

A seventh aspect of the present disclosure is directed to an in-compartment air conditioning device, in which the airtightness evaluation device (130) according to any one of the first to sixth aspects and the suctioned from the outside of the storage (1) An air pump (36) for pressurizing and discharging the outside air and a supply air having a different composition from the outside air from the outside air discharged by the air pump (36) are separated, and the air for supply is separated. And the separation unit (41) for supplying the inside of the storage case (1), and the air pump (36) has the storage case (1) in order to make the pressure of the storage case (1) positive. The air pressure adjusting device (131) of the above-mentioned airtightness evaluation device (130) is configured to supply the air.

In the seventh aspect, the airtightness evaluation device (130) of any one of the first to sixth aspects is provided in the in-compartment air conditioning device (30). The in-compartment air conditioning device (30) adjusts the composition of the in-compartment air by supplying supply air having a composition different from that of the outside-compartment air into the inside of the storage (1). In this aspect, the air pump (36) with which the in-compartment air conditioning device (30) adjusts the composition of the in-compartment air doubles as the air pressure adjustment device (131) of the airtightness evaluation device (130). The airtightness evaluation device (130) of this aspect supplies air to the storage case (1) by the air pump (36) which doubles as an air pressure adjustment device (131), and makes the air pressure in the storage case (1) a positive pressure.

The eighth aspect of the present disclosure is directed to an air conditioning device in a storage, and includes the airtightness evaluation device (130) according to any one of the first to sixth aspects, and the composition of air in the storage of the storage (1). And a composition control unit (40, 60) for adjusting the target composition to be different from the composition of the atmosphere, the evaluation unit (116) of the airtightness evaluation device (130) comprising the composition control unit (40). , 60), and the evaluation operation is performed when a failure condition indicating that the composition of the air in the storage (1) can not reach the target composition is satisfied.

In the eighth aspect, if the composition adjustment unit (40, 60) does not operate normally, the composition of the air in the storage (1) does not reach the target composition. In addition, even if the composition control unit (40, 60) operates normally, if the airtightness of the storage case (1) is low, the flow rate of the air entering the inside from the outside of the storage case (1) increases. The composition of the air in the storage (1) may not reach the target composition.

Therefore, in the eighth aspect, when the failure condition is satisfied, the evaluation unit (116) of the airtightness evaluation device (130) performs the evaluation operation. When the evaluation unit (116) performs the evaluation operation, the airtightness of the storage case (1) is evaluated. As a result, it can be determined whether the cause of the composition of the air in the storage (1) not reaching the target composition is the failure of the composition adjustment unit (40, 60) or the airtightness of the storage (1). It becomes possible.

The ninth aspect of the present disclosure is directed to a refrigeration system, and the airtightness evaluation device (130) according to any one of the first to sixth aspects, and the temperature of air inside the storage compartment (1) have a target temperature And the refrigerant circuit (11) for performing the refrigeration cycle to cool the inside air by the refrigerant, and the evaluation unit (116) of the airtightness evaluation device (130) includes the refrigerant circuit (11). The evaluation operation is configured to be performed when a failure condition indicating that the temperature of the air in the storage (1) can not reach the target temperature is satisfied by the operation of 2.).

In the ninth aspect, if the refrigerant circuit (11) does not operate normally, the temperature of the air in the storage (1) does not reach the target temperature. In addition, even if the refrigerant circuit (11) is operating normally, if the airtightness of the storage case (1) is low, the flow rate of the air entering the inside from the outside of the storage case (1) increases, and the storage case There is a possibility that the temperature of the inside air of (1) may not reach the target temperature.

Therefore, in the ninth aspect, when the failure condition is satisfied, the evaluation unit (116) of the airtightness evaluation device (130) performs the evaluation operation. When the evaluation unit (116) performs the evaluation operation, the airtightness of the storage case (1) is evaluated. As a result, it becomes possible to determine whether the cause of the composition of the air in the storage (1) not reaching the target composition is the failure of the refrigerant circuit (11) or the airtightness of the storage (1). .

In the first aspect, the air pressure adjusting device (131) adjusts the air pressure in the storage case (1), and the evaluation unit (116) stores the storage case based on the measurement values of the air pressure sensors (103, 65, 45). 1) Evaluate air tightness. For this reason, according to this aspect, it is possible to automatically evaluate the airtightness of the storage case (1).

In the third aspect, the evaluation unit (116) performs an evaluation operation of evaluating the airtightness of the storage case (1) using one evaluation condition designated by the worker among a plurality of evaluation conditions. Therefore, according to this aspect, the operator can select one evaluation condition used in the evaluation operation from among a plurality of evaluation conditions, and the usability of the in-compartment air conditioner (30) is improved.

In the sixth aspect, the air pump (36) provided in the in-compartment air conditioner (30) doubles as the air pressure regulator (131) of the air tightness evaluation device (130). Therefore, according to this aspect, it is possible to reduce the number of parts of the in-compartment air conditioner (30) including the air tightness evaluation device (130).

In the seventh aspect, the evaluation unit (116) of the airtightness evaluation device (130) performs an evaluation operation when a failure condition indicating that the composition of the air in the storage (1) does not reach the target composition is satisfied. To evaluate the airtightness of the storage cabinet (1). Therefore, according to this aspect, is the cause that the composition of the air in the storage (1) does not reach the target composition is the failure of the composition adjustment unit (40, 60) or the airtightness of the storage (1)? It is possible to determine

In the eighth aspect, the evaluation unit (116) of the air tightness evaluation device (130) performs the evaluation operation when a failure condition indicating that the temperature of the air inside the storage (1) does not reach the target temperature is satisfied. To evaluate the airtightness of the storage cabinet (1). Therefore, according to this aspect, it is determined whether the cause that the temperature of the air inside the storage case (1) does not reach the target temperature is the failure of the refrigerant circuit (11) or the airtightness of the storage case (1). It becomes possible.

FIG. 1 is a schematic cross-sectional view of a transportation container provided with the in-compartment air conditioning device of the first embodiment. FIG. 2 is a refrigerant circuit diagram showing a configuration of a refrigerant circuit of a refrigerator provided in the transport container. FIG. 3 is a piping system diagram showing the configuration of the in-compartment air conditioning device of the first embodiment. FIG. 4 is a piping system diagram of the in-compartment air conditioning device of the first embodiment showing a state in which the airtightness evaluation device is under evaluation operation. FIG. 5 is a block diagram showing the configuration of the controller of the first embodiment. FIG. 6 is a flowchart showing the evaluation operation performed by the airtightness evaluation unit of the first embodiment. FIG. 7 is a piping system diagram showing a configuration of the in-compartment air conditioning device of the second embodiment. FIG. 8 is a flowchart showing the evaluation operation performed by the airtightness evaluation unit of the second embodiment. FIG. 9 is a piping system diagram showing a configuration of the in-compartment air conditioning device of the third embodiment. FIG. 10 is a flowchart showing the evaluation operation performed by the airtightness evaluation unit of the third embodiment. FIG. 11 is a flowchart showing the evaluation operation performed by the airtightness evaluation unit of the fourth embodiment. FIG. 12 is a piping system diagram showing a configuration of the in-compartment air conditioning device of the fifth embodiment. FIG. 13 is a piping system diagram of the in-compartment air conditioning device of the fifth embodiment showing a state in which the air tightness evaluation device is under evaluation operation. FIG. 14 is a piping diagram showing a configuration of the in-compartment air conditioning device of the sixth embodiment. FIG. 15 is a piping system diagram of the in-compartment air conditioning device of the sixth embodiment, which shows the state during the evaluation operation of the airtightness evaluation device. FIG. 16 is a piping diagram showing a configuration of the in-compartment air conditioning device of the seventh embodiment. FIG. 17 is a piping diagram of the in-compartment air conditioning device of the seventh embodiment showing a state in which the air tightness evaluation device is under evaluation operation. FIG. 18 is a flowchart showing the evaluation operation performed by the airtightness evaluation unit of the eighth embodiment. FIG. 19 is a piping diagram showing the configuration of the inside air conditioning device of the ninth embodiment. FIG. 20 is a piping diagram of the in-compartment air conditioning device, showing the state during first operation of the first composition regulation unit of the ninth embodiment. FIG. 21 is a piping diagram of the in-compartment air conditioning device, showing the state during second operation of the first composition adjustment portion of the ninth embodiment. FIG. 22 is a piping diagram of the in-compartment air conditioning device, showing a state during the outside air introduction operation of the first composition adjustment portion of the ninth embodiment.

Embodiments of the present invention will be described in detail based on the drawings. Note that the embodiments and modifications described below are essentially preferred examples, and are not intended to limit the scope of the present invention, its applications, or its applications. Moreover, the embodiments and modifications described below can be combined or replaced as appropriate as long as the functions of the airtightness evaluation device (130), the internal air conditioning device (30), and the refrigerator (10) are not impaired. You may

Embodiment 1
The first embodiment will be described. The in-compartment air conditioner (30) of the present embodiment is provided in the transport container (1) to perform so-called CA (Controlled Atmosphere) transport. Then, the in-compartment air conditioner (30) regulates the composition of air in the transport container (1) to be different from the composition of the atmosphere. Further, although the details will be described later, an airtightness evaluation device (130) is incorporated in the in-compartment air conditioning device (30).

As shown in FIG. 1, the transport container (1) constituting the storage includes a container body (2) and a refrigerator (10) for the container. The transport container (1) is a reefer container capable of controlling the temperature inside the refrigerator. The in-compartment air conditioner (30) of the present embodiment is installed in a refrigerator (10). The transport container (1) is used to transport respirable plants that take in oxygen (O ₂ ) in the air and release carbon dioxide (CO ₂ ). Examples of plants include fruits such as banana and avocado, vegetables, grains, bulbs, fresh flowers and the like.

The container body (2) is formed in an elongated rectangular parallelepiped box shape. The container body (2) is open at one end face, and the refrigerator (10) is attached so as to close the open end. The internal space of the container body (2) constitutes a loading space (5) for storing the cargo (6).

At the bottom of the loading space (5), a floor plate (3) for placing the cargo (6) is arranged. Between the floor plate (3) and the bottom plate of the container body (2), an under-floor flow path (4) for flowing the air blown out by the refrigerator (10) is formed. The underfloor channel (4) is a channel extending in the longitudinal direction of the container body (2) along the bottom plate of the container body (2). The underfloor flow path (4) has one end connected to the outlet (27) of the refrigerator (10) and the other end is the space above the floor plate (3) (ie, the space in which the cargo (6) is accommodated) It communicates.

-Configuration of refrigerator-
As shown in FIG. 1, the refrigerator (10) comprises a casing (20), a refrigerant circuit (11) performing a refrigeration cycle, an external fan (16), and an internal fan (17). It is an apparatus.

The casing (20) includes a storage outer wall (21), a storage inner wall (22), a back plate (24), and a dividing plate (25). As described later, the casing (20) is provided with a refrigerant circuit (11), an external fan (16), and an internal fan (17).

The storage outer wall portion (21) is a plate-like member disposed so as to cover the open end of the container main body (2). The lower portion of the storage outer wall (21) bulges to the inside of the container body (2). The storage inner wall portion (22) is a plate-like member having a form along the storage outer wall portion (21). The storage inner wall (22) is arranged to cover the inner surface of the container body (2) in the storage outer wall (21). A heat insulating material (23) is filled in the space between the storage outer wall (21) and the storage inner wall (22).

The lower portion of the casing (20) is recessed inward of the container body (2). The lower part of the casing (20) forms an external storage compartment (28) in communication with the external space of the transport container (1). An extra-compartment fan (16) is disposed in the extra-compartment equipment room (28).

The back plate (24) is a substantially rectangular flat member. The back plate (24) is disposed on the inner side of the container body (2) than the storage inner wall (22), and forms an internal air flow passage (29) with the storage inner wall (22). The upper end of the in-compartment air flow passage (29) constitutes the suction port (26) of the casing (20), and the lower end thereof constitutes the blowout port (27) of the casing (20).

The partition plate (25) is a plate-like member arranged to partition the internal air flow passage (29) up and down. The partition plate (25) is disposed in the upper part of the internal air flow passage (29). The compartment air passage (29) is provided with the primary flow passage (29a) above the partition plate (25) and the secondary flow passage (29b) below the partition plate (25) by the partition plate (25). Divided into The primary flow passage (29a) communicates with the loading space (5) through the suction port (26). The secondary flow passage (29b) communicates with the underfloor flow passage (4) through the blowout port (27). An internal fan (17) is attached to the partition plate (25). The internal fan (17) is arranged to blow out the air drawn from the primary flow passage (29a) to the secondary flow passage (29b).

As shown in FIG. 2, the refrigerant circuit (11) is formed by connecting the compressor (12), the condenser (13), the expansion valve (14), and the evaporator (15) by piping. Closed circuit. When the compressor (12) is operated, the refrigerant circulates through the refrigerant circuit (11) to perform a vapor compression refrigeration cycle. As shown in FIG. 1, the condenser (13) is disposed on the suction side of the external fan (16) in the external equipment chamber (28), and the evaporator (15) is an internal air flow path (29) Are arranged in the secondary flow path (29b) of Moreover, although illustration is abbreviate | omitted in FIG. 1, a compressor (12) is arrange | positioned at an outside storage chamber (28).

-Operation of the refrigerator-
The refrigerator (10) performs a cooling operation to cool the air in the storage container (1).

In the cooling operation, the compressor (12) of the refrigerant circuit (11) operates, and the refrigerant is circulated in the refrigerant circuit (11) to perform a vapor compression refrigeration cycle. In the refrigerant circuit (11), the refrigerant discharged from the compressor (12) passes through the condenser (13), the expansion valve (14) and the evaporator (15) in this order, and then to the compressor (12) It is inhaled and compressed.

Further, in the cooling operation, the external fan (16) and the internal fan (17) operate. When the external fan (16) is activated, external air outside the transport container (1) is sucked into the external equipment chamber (28) and passes through the condenser (13). In the condenser (13), the refrigerant releases heat to air outside the storage and condenses. When the internal fan (17) is activated, internal air in the cargo compartment (5) of the transport container (1) is sucked into the internal air flow path (29) and passes through the evaporator (15). In the evaporator (15), the refrigerant absorbs heat from outside air and evaporates.

The flow of air in the storage will be described. The internal air present in the cargo compartment (5) flows into the primary flow path (29a) of the internal air flow path (29) through the suction port (26), and the secondary flow is performed by the internal fan (17) It is blown out to the road (29b). The inside air flowing into the secondary flow passage (29b) is cooled when passing through the evaporator (15), and then blown out from the blowout port (27) to the underfloor flow passage (4). 4) Flow into the cargo room (5).

In the internal air flow path (29), the primary flow path (29a) is located on the suction side of the internal fan (17), and the secondary flow path (29b) is located on the blowout side of the internal fan (17) . Therefore, during operation of the internal fan (17), the air pressure in the secondary flow passage (29b) is slightly higher than the air pressure in the primary flow passage (29a).

-Inside air conditioner-
As shown in FIG. 1, the in-compartment air conditioner (30) comprises a main body unit (31), a sensor unit (90), a ventilating exhaust pipe (100), and a controller (110). . The main body unit (31) is installed in the external equipment room (28) of the refrigerator (10). The sensor unit (90) is installed in the in-compartment air flow path (29) of the transport container (1). The ventilation exhaust pipe (100) is installed across the in-compartment air flow path (29) of the transport container (1) and the out-of-compartment equipment room (28). The controller (110) is provided in the main body unit (31) to control constituent devices of the in-compartment air conditioner (30). Details of the sensor unit (90), the ventilation exhaust pipe (100), and the controller (110) will be described later.

As shown in FIG. 3, the main body unit (31) of the in-compartment air conditioning device (30) includes a first composition regulation unit (40), a second composition regulation unit (60), and a pump unit (35). A unit case (32) is provided. The unit case (32) is a box-like closed container. The first composition adjusting unit (40), the second composition adjusting unit (60), and the pump unit (35) are disposed in the internal space of the unit case (32). The details of the first composition adjusting unit (40), the second composition adjusting unit (60), and the pump unit (35) will be described later.

In addition, the in-compartment air conditioning device (30) includes a supply pipe (120), an in-compartment suction pipe (75), and a measurement pipe (125). The supply pipe (120), the storage inner suction pipe (75), and the measurement pipe (125) are pipes for connecting the main body unit (31) to the internal air flow path (29) of the refrigerator (10). is there.

The supply pipe (120) is a pipe for supplying the air flowing out of the first composition control unit (40) and the second composition control unit (60) to the loading space (5). The inlet end of the supply pipe (120) is connected to the first composition adjusting unit (40) and the second composition adjusting unit (60), and the outlet end is the secondary flow passage (29b) of the internal air flow passage (29) Open to

The storage inner suction pipe (75) is a pipe for supplying the storage internal air in the loading space (5) to the second composition adjustment section (60). The inlet end of the storage inner suction pipe (75) opens to the secondary flow passage (29b) of the storage inner air flow passage (29), and the outlet end of the second pump of the second composition adjustment unit (60) 37) connected. In the secondary flow passage (29b) of the in-compartment air flow passage (29), the inlet end of the storage inner suction pipe (75) is disposed upstream of the outlet end of the supply pipe (120).

The measurement pipe (125) is a pipe for supplying the air flowing through the supply pipe (120) to the sensor unit (90). The measurement pipe (125) has an inlet end connected to the supply pipe (120) and an outlet end connected to the sensor unit (90). Further, the measurement pipe (125) is provided with a measurement on-off valve (126) consisting of a solenoid valve. The measurement on-off valve (126) is housed in a unit case (32) of the main unit (31).

<Pumping unit>
As shown in FIG. 3, the pump unit (35) includes a first pump (36), a second pump (37), and a drive motor (38).

Each of the first pump (36) and the second pump (37) is an air pump for discharging the sucked air. Each of the first pump (36) and the second pump (37) is constituted by, for example, a positive displacement fluid machine. The first pump (36) and the second pump (37) are integrated. The drive motor (38) is a motor connected to the first pump (36) and the second pump (37). The drive motor (38) drives both the first pump (36) and the second pump (37).

<First composition adjustment unit>
The first composition adjusting unit (40) is configured to separate the outside air (air outside the unprocessed room) sucked from the outside of the transport container (1) into the first outside air and the second outside air. Ru. The first composition adjustment unit (40) of the present embodiment supplies the first outside air, which is supply air, to the loading space (5) and discharges the second outside air to the outside of the transportation container (1). Do.

The first composition control unit (40) includes an air filter (47), a first separation module (41), a first bypass valve (50), a first pressure sensor (45) and a first control valve (46). And have. In addition, the first composition adjusting unit (40) includes a storage outside suction pipe (55), a first introduction pipe (52), a first primary side pipe (53), and a first secondary side pipe (54). , And a first bypass pipe (51). In addition, the first pump (36) of the pump unit (35) constitutes this first composition adjustment section (40).

The air filter (47) is a membrane filter for capturing dust, salt and the like contained in the outside air. The air filter (47) is attached to the unit case (32) of the main unit (31). The air filter (47) is connected to the suction port of the first pump (36) via the outer storage suction pipe (55).

The first separation module (41) includes a first inlet (42), a first primary outlet (43), and a first secondary outlet (44). The first inlet (42) is connected to the outlet of the first pump (36) through the first inlet pipe (52). The first primary outlet (43) is connected to the supply pipe (120) via the first primary pipe (53). One end of a first secondary side pipe (54) is connected to the first secondary side outlet (44). The first secondary pipe (54) extends to the outside of the unit case (32). The other end of the first secondary side pipe (54) opens to the suction side of the external fan (16) in the external equipment chamber (28).

The first bypass valve (50) is a switching valve having three ports, and constitutes a first bypass valve mechanism. The first bypass valve (50) has a first state (shown by a solid line in FIG. 3) in which the first port is in communication with the second port and shut off from the third port; It is configured to be in communication with the third port and to switch to a second state (state shown by a broken line in FIG. 3) which is disconnected from the second port.

The first bypass valve (50) is disposed in the middle of the first introduction pipe (52). The first bypass valve (50) has a first port connected to the discharge port of the first pump (36), and a second port connected to the first inlet (42) of the first separation module (41) . The inlet end of the first bypass pipe (51) is connected to the third port of the first bypass valve (50). The outlet end of the first bypass pipe (51) is connected to the first primary pipe (53). The first bypass pipe (51) constitutes a first bypass passage.

The first pressure sensor (45) and the first control valve (46) are provided in the first primary pipe (53). The first pressure sensor (45) and the first control valve (46) are closer to the first separation module (41) than the other end of the first bypass pipe (51) connected to the first primary pipe (53). Be placed. Further, the first pressure sensor (45) is disposed closer to the first separation module (41) than the first control valve (46).

The first pressure sensor (45) measures the pressure of the first outside air flowing out of the first primary outlet (43) of the first separation module (41). The measurement value of the first pressure sensor (45) is substantially equal to the pressure of the outside air outside the storage, which the first pump (36) supplies to the first separation module (41).

The first control valve (46) is a motor-operated valve whose opening degree is variable, and constitutes a first valve mechanism. When the opening degree of the first control valve (46) is changed, the pressure of the air outside the unprocessed storage which the first pump (36) supplies to the first separation module (41) changes.

The first separation module (41) constitutes a first separation unit. Although the details will be described later, the first separation module (41) includes a gas separation membrane. Then, the first separation module (41) separates the untreated outside air into the first outside air that has not passed through the gas separation membrane and the second outside air that has passed through the gas separation membrane.

The first outside air has a nitrogen concentration higher than that of the untreated outside air, and an oxygen concentration lower than that of the untreated outside air. The second outside air has a nitrogen concentration lower than that of the untreated outside air, and an oxygen concentration higher than that of the untreated outside air. Thus, the concentrations of the substances constituting the first external air and the second external air are different from each other. The concentration in the present specification means a volume ratio.

<2nd composition adjustment part>
The second composition adjustment unit (60) is configured to separate the in-compartment air (untreated in-compartment air) sucked from the internal space of the transport container (1) into the first in-compartment air and the second in-compartment air. Be done. The second composition adjustment unit (60) of the present embodiment supplies the first in-storage air to the loading space (5), and discharges the second in-storage air, which is discharge air, to the outside of the transport container (1). Do.

The second composition adjustment unit (60) includes a second separation module (61), a second bypass valve (70), a second pressure sensor (65), and a second adjustment valve (66). In addition, the second composition adjusting unit (60) includes a second introduction pipe (72), a second primary side pipe (73), a second secondary side pipe (74), and a second bypass pipe (71). Is equipped. In addition, the second pump (37) of the pump unit (35) constitutes this second composition adjustment unit (60).

The second separation module (61) includes a second inlet (62), a second primary outlet (63), and a second secondary outlet (64). The second inlet (62) is connected to the outlet of the second pump (37) via the second inlet pipe (72). The second primary outlet (63) is connected to the supply pipe (120) via the second primary pipe (73). One end of a second secondary pipe (74) is connected to the second secondary outlet (64). The second secondary pipe (74) extends to the outside of the unit case (32). The other end of the second secondary side pipe (74) opens on the suction side of the external fan (16) in the external equipment chamber (28). In addition, an inner suction pipe (75) is connected to the suction port of the second pump (37).

The second bypass valve (70) is a switching valve having three ports, and constitutes a second bypass valve mechanism. The second bypass valve (70) has a first state (shown by a solid line in FIG. 3) in which the first port is in communication with the second port and is shut off from the third port; It is configured to be in communication with the third port and to switch to a second state (state shown by a broken line in FIG. 3) which is disconnected from the second port.

The second bypass valve (70) is disposed in the middle of the second introduction pipe (72). In the second bypass valve (70), the first port is connected to the discharge port of the second pump (37), and the second port is connected to the second inlet (62) of the second separation module (61) . The inlet end of the second bypass pipe (71) is connected to the third port of the second bypass valve (70). The outlet end of the second bypass pipe (71) is connected to the second primary pipe (73). The second bypass pipe (71) constitutes a second bypass passage.

The second pressure sensor (65) and the second control valve (66) are provided in the second primary pipe (73). The second pressure sensor (65) and the second control valve (66) are closer to the second separation module (61) than the other end of the second bypass pipe (71) connected to the second primary pipe (73). Be placed. In addition, the second pressure sensor (65) is disposed closer to the second separation module (61) than the second control valve (66).

The second pressure sensor (65) measures the pressure of the second outside air flowing out of the second primary outlet (63) of the second separation module (61). The measurement value of the second pressure sensor (65) is substantially equal to the pressure of the air in the non-processed storage that the second pump (37) supplies to the second separation module (61).

The second control valve (66) is a motor-operated valve whose opening degree is variable, and constitutes a second valve mechanism. When the degree of opening of the second control valve (66) is changed, the pressure of the air in the non-processed housing supplied to the second separation module (61) by the second pump (37) changes.

The second separation module (61) constitutes a second separation unit. Although the details will be described later, the second separation module (61) includes a gas separation membrane. Then, the second separation module (61) separates the air in the non-treated storage into the first air in the storage that has not permeated the gas separation membrane and the second air in the storage that has permeated the gas separation membrane.

The first interior air has a nitrogen concentration higher than that of the untreated interior air, and an oxygen concentration and a carbon dioxide concentration lower than that of the untreated interior air. The second internal air has a nitrogen concentration lower than that of the untreated internal air, and an oxygen concentration and a carbon dioxide concentration higher than that of the untreated internal air. Thus, the concentrations of the materials constituting the first internal air and the second internal air differ from each other.

Separation module
The structures of the first separation module (41) and the second separation module (61) will be described. The structures of the first separation module 41 and the second separation module 61 are identical to each other.

Each separation module (41, 61) is formed in an elongated cylindrical shape closed at both ends. Each separation module (41, 61) has an inlet (42, 62) at one end, a primary outlet (43, 63) at the other end, and a secondary outlet (side) at the side. 44, 64) are arranged.

Although not shown, a large number of hollow fiber-shaped gas separation membranes are accommodated inside each separation module (41, 61). In each separation module (41, 61), the inlet (42, 62) communicates with the inlet end of the hollow fiber-shaped gas separation membrane, and the primary side outlet (43, 63) is the outlet end of the hollow fiber-shaped gas separation membrane The secondary side outlet (44, 64) communicates with a portion of the internal space of the separation module (41, 61) outside the hollow fiber-like gas separation membrane.

The gas separation membrane is a non-porous membrane made of a polymer. The gas separation membrane of each separation module (41, 61) has a characteristic that the permeability of nitrogen is lower than both of the permeability of oxygen and the permeability of carbon dioxide. For this reason, in each separation module (41, 61), the air that has not permeated the gas separation membrane and reached the primary outlet (43, 63) is compared to the air that has flowed in from the inlet (42, 62) , High nitrogen concentration, low oxygen concentration and carbon dioxide concentration. Further, in each separation module (41, 61), the air which permeates the gas separation membrane and reaches the secondary side outlet (44, 64) is compared with the air flowing in from the inlet (42, 62), Low nitrogen concentration, high oxygen concentration and carbon dioxide concentration.

<Sensor unit>
As shown in FIGS. 1 and 3, the sensor unit (90) is disposed in the secondary flow passage (29b) of the in-compartment air flow passage (29) of the container refrigerator (10). As shown in FIG. 3, the sensor unit (90) includes an oxygen sensor (91), a carbon dioxide sensor (92), and a sensor case (93).

The oxygen sensor (91) is a zirconia current sensor that measures the oxygen concentration of a mixed gas such as air. The carbon dioxide sensor (92) is a non dispersive infrared (NDIR: non dispersive infrared) type sensor that measures the carbon dioxide concentration of a mixed gas such as air. The oxygen sensor (91) and the carbon dioxide sensor (92) are housed in a sensor case (93).

The sensor case (93) is a slightly elongated box-like member. In the sensor case (93), the outlet end of the measurement pipe (125) is connected to one end in the longitudinal direction, and one end of the outlet pipe (95) is connected to the other end. The other end of the outlet pipe (95) opens into the primary flow passage (29a) of the internal air flow passage (29). In addition, an air filter (94) is attached to the sensor case (93) for introducing the internal air flowing through the internal air flow path (29) into the internal space of the sensor case (93). The air filter (94) is a membrane filter for capturing dust and the like contained in the air in the refrigerator.

As described later, during operation of the internal fan (17), the air pressure in the secondary flow passage (29b) is slightly higher than the air pressure in the primary flow passage (29a). For this reason, when the measurement on-off valve (126) is closed, the internal air of the secondary flow passage (29b) flows into the sensor case (93) through the air filter (94) and then the outlet pipe ( 95) through the primary channel (29a). In this state, in the sensor unit (90), the oxygen sensor (91) measures the oxygen concentration of the air inside the storage, and the carbon dioxide sensor (92) measures the carbon dioxide concentration of the air inside the storage.

<Ventilation exhaust pipe>
The ventilation exhaust pipe (100) is a pipe for connecting the inside and the outside of the transportation container (1). The ventilation exhaust pipe (100) constitutes a ventilation exhaust passage. As shown in FIG. 1, the ventilation exhaust pipe (100) penetrates the casing (20) of the refrigerator (10). One end of the ventilation exhaust pipe (100) opens to the secondary flow passage (29b) of the internal air flow passage (29). The other end of the ventilation exhaust pipe (100) opens to the suction side of the external fan (16) in the external equipment chamber (28).

As shown in FIG. 3, an air filter (102) is attached to one end of the ventilation exhaust pipe (100). The air filter (102) is a membrane filter for capturing dust and the like contained in the air in the refrigerator. The ventilation exhaust pipe (100) is provided with a ventilation exhaust valve (101). The ventilation exhaust valve (101) is an on-off valve composed of a solenoid valve.

The ventilation exhaust pipe (100) is provided with a third pressure sensor (103). The third pressure sensor (103) is disposed between the air filter (102) and the ventilation exhaust valve (101), and measures the pressure in the ventilation exhaust pipe (100). The air pressure in the ventilation exhaust pipe (100) is substantially equal to the air pressure in the secondary flow passage (29b) of the refrigerator (10). In addition, while the internal fan (17) is stopped, the air pressure in the secondary flow passage (29b) is substantially equal to the air pressure in the loading space (5). For this reason, while the internal fan (17) is stopped, the measurement value of the third pressure sensor (103) substantially matches the air pressure in the loading space (5).

Controller
As shown in FIG. 3, the controller (110) includes a CPU (111) that performs a control operation, and a memory (112) that stores data and the like necessary for the control operation. Measurement values of the oxygen sensor (91), the carbon dioxide sensor (92), the first pressure sensor (45), and the second pressure sensor (65) are input to the controller (110). The controller (110) includes a pump unit (35), a first control valve (46), a second control valve (66), a first bypass valve (50), a second bypass valve (70), and an exhaust valve for ventilation. A control operation for operating (101) is performed.

Further, as shown in FIG. 5, the controller (110) includes an in-compartment environment control unit (115) and an airtightness evaluation unit (116). The internal environment control unit (115) makes the composition of the air inside the cargo room (5) the target composition (specifically, the oxygen concentration and the carbon dioxide concentration of the air inside the To control the components of the in-compartment air conditioner (30). The airtightness evaluation unit (116) will be described later.

-Operation of the air conditioning system in the storage room-
The in-compartment air conditioning device (30) is for adjusting the composition of the in-compartment air (in the present embodiment, the oxygen concentration and the carbon dioxide concentration of the in-compartment air) in the cargo compartment (5) of the transport container (1). Do the driving. Here, the target range of the oxygen concentration of the air in the refrigerator is 5% ± 1% and the target range of the carbon dioxide concentration of the air in the refrigerator is 2 for the operation of the air conditioner (30) of this embodiment. The case of% ± 1% will be described as an example.

<Outline of the operation of the air conditioning system in the cold storage>
The in-compartment air conditioning device (30) of the present embodiment includes an oxygen concentration reducing operation for reducing the oxygen concentration of the in-compartment air in the loading compartment (5), and the oxidation of the in-compartment air in the loading compartment (5). The carbon dioxide concentration reducing operation for reducing the carbon concentration and the oxygen concentration increasing operation for increasing the oxygen concentration of the air in the storage compartment (5) are performed.

When the loading of the cargo (6) into the transportation container (1) is completed, the composition of the air inside the cargo compartment (5) is the composition of the atmosphere (nitrogen concentration: 78%, oxygen concentration: 21) %, Substantially the same as the carbon dioxide concentration: 0.04%). Therefore, the in-compartment air conditioning device (30) performs an oxygen concentration reduction operation for reducing the oxygen concentration of the in-compartment air. When the oxygen concentration of the in-compartment air reaches the upper limit value (6%) of the target range, the in-compartment air conditioner (30) stops the oxygen concentration reduction operation.

After the oxygen concentration of the storage air reaches 6% and the oxygen concentration stopping operation of the storage air conditioning device (30) is stopped, the plant which is the cargo (6) breathes, the oxygen concentration of the storage air The carbon dioxide concentration of the air in the storage increases gradually as

When the carbon dioxide concentration in the storage air reaches the upper limit (3%) of the target range, the storage air conditioner (30) performs a carbon dioxide concentration reduction operation to reduce the carbon dioxide concentration in the storage air. . When the carbon dioxide concentration in the storage air reaches the lower limit (1%) of the target range, the storage air regulator (30) stops the carbon dioxide concentration reduction operation.

In addition, when the oxygen concentration of the in-chamber air reaches the lower limit value (4%) of the target range, the in-chamber air regulator (30) performs an oxygen concentration increasing operation for increasing the oxygen concentration of the in-chamber air. When the oxygen concentration of the in-compartment air reaches the upper limit value (6%) of the target range, the in-compartment air conditioner (30) stops the oxygen concentration increasing operation.

Thus, the in-compartment air conditioner (30) reduces the oxygen concentration reduction operation to lower the oxygen concentration of the in-compartment air in the cargo compartment (5) from 21% (oxygen concentration of the atmosphere) to the target range. Do. In addition, the in-compartment air conditioner (30) operates to reduce carbon dioxide and increase oxygen concentration in order to maintain the oxygen concentration and carbon dioxide concentration of the in-compartment air in the cargo compartment (5) within their respective target ranges. And repeat as appropriate.

<Oxygen concentration reduction operation>
The oxygen concentration reduction operation of the in-compartment air conditioning device (30) will be described. In this oxygen concentration reduction operation, the first composition adjusting unit (40) supplies the first outside air with low oxygen concentration to the loading space (5), and the second composition adjusting unit (60) generates the first oxygen with low oxygen concentration. Supply the storage air to the loading space (5).

In the oxygen concentration reduction operation, the internal environment control unit (115) of the controller (110) shows each of the first bypass valve (50) and the second bypass valve (70) in the first state (solid line in FIG. 3) State), the drive motor (38) of the pump unit (35) is energized to operate the first pump (36) and the second pump (37), and the ventilation exhaust valve (101) is set open Do.

First, when the first pump (36) operates, the outside air existing outside the transport container (1) passes through the air filter (47) and the outside suction pipe (55) to the first pump (36). Sucked into The first pump (36) pressurizes and discharges the sucked outside air. The pressure of the outside air discharged by the first pump (36) is about twice the atmospheric pressure. The outside air discharged from the first pump (36) flows through the first introduction pipe (52) and flows into the first inlet (42) of the first separation module (41) as untreated outside air.

The untreated outside air flowing into the first separation module (41) is separated into the first outside air that has not passed through the gas separation membrane and the second outside air that has passed through the gas separation membrane. The first outside air with low oxygen concentration flows into the supply pipe (120) sequentially through the first primary outlet (43) and the first primary pipe (53). On the other hand, the second outside air with high oxygen concentration is discharged to the outside of the transport container (1) through the first secondary outlet (44) and the first secondary pipe (54) in this order.

Next, when the second pump (37) is operated, the internal air present in the inside of the transport container (1) (specifically, the secondary flow path (29b) of the refrigerator (10)) It is drawn into the second pump (37) through the inner suction pipe (75). The second pump (37) pressurizes and discharges the sucked storage air. The pressure of the internal air discharged by the second pump (37) is slightly higher than the atmospheric pressure. The internal air discharged from the second pump (37) flows through the second introduction pipe (72) and flows into the second introduction port (62) of the second separation module (61) as untreated internal air.

The untreated internal air flowing into the second separation module (61) is separated into the first internal air that has not permeated the gas separation membrane and the second internal air that has permeated the gas separation membrane. The first storage air having a low oxygen concentration flows into the supply pipe (120) through the second primary outlet (63) and the second primary pipe (73) in order. On the other hand, the second storage air having a high oxygen concentration is discharged to the outside of the transport container (1) through the second secondary outlet (64) and the second secondary pipe (74) in this order.

As described above, the first external air flowing out of the first separation module (41) and the first internal air flowing out of the second separation module (61) flow into the supply pipe (120). Then, the mixed air of the first outside air and the first inside air flowing through the supply pipe (120) flows into the secondary flow passage (29b) of the refrigerator (10), and the secondary flow passage (29b) It is supplied to the loading space (5) together with the flowing air.

Normally, during the operation for reducing the oxygen concentration, the flow rate Q _o1 of the first outside air supplied from the outside to the inside of the transport container (1) is discharged from the inside of the transport container (1) to the outside The flow rate in the storage air is larger than the flow rate Q _i2 (Q _o1 > Q _i2 ), and the air pressure in the transport container (1) becomes a positive pressure. Since the air pressure in the transport container (1) is a positive pressure, a part of the internal air is discharged to the outside of the transport container (1) through the ventilation exhaust pipe (100).

As described above, in the oxygen concentration reduction operation, the container outside the cargo compartment (5) is transported through the ventilation exhaust pipe (100) at the same time as supplying the first outside air with lower oxygen concentration than the atmosphere. The oxygen concentration of the air in the storage compartment in the cargo compartment (5) is reduced by discharging the air to the outside of (1) and replacing the air in the cargo compartment (5) with the air outside the first storage compartment. In addition, in the oxygen concentration reduction operation, the inside of the storage compartment in the cargo compartment (5) is discharged by discharging the second storage inside air having a high concentration of oxygen separated from the air inside the unprocessed storage outside the transportation container (1). Reduce the oxygen concentration of air.

<Operation to reduce carbon dioxide concentration>
The carbon dioxide concentration reduction operation of the in-compartment air conditioning device (30) will be described. In the carbon dioxide reduction operation, the first composition adjustment unit (40) supplies the first outside air with low oxygen concentration to the loading space (5), and the second composition adjustment unit (60) 1 Supply the air inside the storage room to the loading room (5).

In the carbon dioxide concentration reduction operation, the internal environment control unit (115) of the controller (110) sets each of the first bypass valve (50) and the second bypass valve (70) in the first state (solid line in FIG. 3) In the condition shown, the drive motor (38) of the pump unit (35) is energized to operate the first pump (36) and the second pump (37), and the ventilation exhaust valve (101) is opened. Set and set the measurement on / off valve (126) in the closed state. Then, in each of the first composition adjusting unit (40) and the second composition adjusting unit (60), air flows in the same manner as the oxygen concentration reducing operation. However, in the carbon dioxide concentration reduction operation, the pressure of the outside air discharged by the first pump (36) and the pressure of the inside air discharged by the second pump (37) are both slightly higher than the atmospheric pressure. It is.

In the first composition adjusting unit (40), the first outside air flowing into the first separation module (41) has a nitrogen concentration higher than that of the untreated outside air and a lower oxygen concentration; It is separated into the second outside air, which is lower in nitrogen concentration and higher in oxygen concentration than untreated outside air. Then, the first outside air is supplied to the inside of the transport container (1), and the second outside air is discharged to the outside of the transport container (1). The carbon dioxide concentration of the untreated outside air is substantially the same as the carbon dioxide concentration (0.04%) of the atmosphere. For this reason, the carbon dioxide concentration of the first outside air can be regarded as substantially zero.

In the second composition control unit (60), the first storage air flowing into the second separation module (61) has a nitrogen concentration higher than that of the untreated storage air and a lower oxygen concentration and carbon dioxide concentration. It is separated into the internal air and the second internal air having a nitrogen concentration lower than that of the untreated internal air and a high oxygen concentration and carbon dioxide concentration. Then, the first internal air is supplied to the inside of the transport container (1), and the second internal air is discharged to the outside of the transport container (1).

Normally, during the carbon dioxide concentration reduction operation, as in the oxygen concentration reduction operation, the flow rate Q _o1 of the first outside air is larger than the flow rate Q _i2 of the second inside air (Q _o1 > Q _i2 ), The pressure inside the shipping container (1) is positive. Since the air pressure in the transportation container (1) is a positive pressure, a part of the storage air in the cargo room (5) passes through the ventilation exhaust pipe (100) to the outside of the transportation container (1) Exhausted.

As described above, in the carbon dioxide concentration reduction operation, at the same time as supplying the first outside air with a very low carbon dioxide concentration, the inside air is discharged to the outside of the transport container (1) through the ventilation exhaust pipe (100). The carbon dioxide concentration of the air inside the cargo room (5) is reduced by replacing the air of the cargo room (5) with the first outside air. Further, in the carbon dioxide concentration reduction operation, the air in the second storage room having a high carbon dioxide concentration separated from the air in the storage room is discharged to the outside of the transport container (1), whereby the inside of the cargo compartment (5) Reduce the concentration of carbon dioxide in the storage room air.

<Oxygen concentration increase operation>
The oxygen concentration increasing operation of the in-compartment air conditioning device (30) will be described. In this oxygen concentration increasing operation, the first composition adjustment unit (40) supplies the outside air taken in from the outside of the transport container (1) as it is to the loading space (5), and the second composition adjustment unit (60) The air inside the storage unit drawn from the inside of the transport container (1) is sent back to the loading room (5) as it is.

In the oxygen concentration increasing operation, the internal environment control unit (115) of the controller (110) shows each of the first bypass valve (50) and the second bypass valve (70) in the second state (indicated by a broken line in FIG. 3). State), the drive motor (38) of the pump unit (35) is energized to operate the first pump (36) and the second pump (37), and the ventilation exhaust valve (101) is set open And the measurement on-off valve (126) is set in the closed state.

In the first composition adjustment unit (40), the outside air discharged from the first pump (36) flows into the first bypass pipe (51), and the first primary is maintained with its nitrogen concentration and oxygen concentration maintained. It flows into the side pipe (53) and thereafter is supplied to the inside of the transport container (1) through the supply pipe (120). On the other hand, in the second composition adjusting unit (60), the internal air sucked into the second pump (37) is discharged from the second pump (37) and then passes through the second bypass pipe (71) It flows into the primary side pipe (73) and thereafter returns to the inside of the transport container (1) through the supply pipe (120). In addition, a part of the air inside the cargo compartment (5) is discharged to the outside of the transport container (1) through the ventilation exhaust pipe (100).

As described above, in the oxygen concentration increasing operation, the oxygen concentration in the cargo compartment (5) is raised by supplying the outside air having a higher oxygen concentration than the inside air to the inside of the transport container (1).

-Airtightness evaluation device-
As described above, the airtightness evaluation device (130) is incorporated in the in-compartment air conditioning device (30). In the present embodiment, the first composition adjusting unit (40), the third pressure sensor (103), and the controller (110) constitute an airtightness evaluation device (130).

The first pump (36) of the first composition control unit (40) is an air pressure control device (131) for supplying air to the inside of the transport container (1) in order to make the atmospheric pressure in the transport container (1) a positive pressure. Configure). That is, in the present embodiment, the first pump (36) of the first composition adjusting unit (40) doubles as the air pressure adjusting device (131) of the air tightness evaluation device (130).

As described above, while the internal fan (17) is stopped, the measurement value of the third pressure sensor (103) substantially matches the air pressure in the loading space (5). The third pressure sensor (103) constitutes an air pressure sensor that measures the air pressure in the loading space (5).

The airtightness evaluation unit (116) is configured to perform an evaluation operation to evaluate the airtightness of the transport container (1). In this evaluation operation, the airtightness evaluation unit (116) determines the success or failure of the “evaluation condition indicating that the airtightness of the transport container (1) has reached the standard level necessary to perform CA transport”. Do. Detailed contents of the evaluation operation of the air tightness evaluation unit (116) will be described later.

The airtightness evaluation unit (116) performs an evaluation operation when the refrigerator (10) and the in-compartment air conditioner (30) perform a pre-use inspection (so-called PTI / Pre-trip Inspection) operation. The pre-use inspection operation is an operation for inspecting whether the refrigerator (10) and the in-compartment air conditioner (30) operate properly.

Here, a container ship is usually loaded with a plurality of transport containers (1) stacked vertically. The transport container (1) disposed at the lower side may be deformed by the weight of the transport container (1) placed thereon. Therefore, even if it is determined that the airtightness of the transport container (1) is satisfied in the evaluation operation performed by the airtightness evaluation unit (116) during the pre-use inspection operation, the use of the transport container (1) During the operation, the airtightness of the transport container (1) may be insufficient.

When the airtightness of the transport container (1) is insufficient, outside air (atmosphere) may intrude into the interior of the transport container (1) through the gap of the transport container (1). Then, when the outside air enters the inside of the transport container (1), the oxygen concentration and the carbon dioxide concentration of the inside air are set to the respective target concentrations, even if the inside air conditioner (30) is operating normally. It may not be possible to keep it in the range. In addition, when the outside air intrudes into the inside of the transport container (1), the temperature of the inside air may not be maintained within the target temperature range even if the refrigerator (10) is operating normally.

Therefore, the airtightness evaluation unit (116) is not only performed during the pre-use inspection operation of the refrigerator (10) and the in-compartment air conditioner (30), but also during the use of the transport container (1). The evaluation operation is also performed when the failure condition or the second failure condition is satisfied.

The first failure condition is a condition that indicates that the composition of the air in the storage compartment in the cargo compartment (5) can not reach the target composition by the operation of the storage compartment air conditioner (30). As the first failure condition, for example, the condition that "during the time when the oxygen concentration of the air in the cold storage becomes the target concentration + 1% or more during the operation of the cold air conditioning device (30), the continuous time is 1 hour or longer" It can be used. Further, as the first fault condition, the condition that "the oxygen concentration of the air in the storage does not decrease to the target concentration even if 24 hours have passed from the time when the oxygen concentration in the storage air reaches the target concentration + 1%" May be used.

The second failure condition is a condition indicating that the air temperature in the loading space (5) can not be reached to the target temperature by the operation of the refrigerator (10). As a second failure condition, for example, “during the operation of the in-compartment air conditioner (30), the temperature of the in-compartment air is 24 hours even after the time when the temperature of the in-compartment air reaches −15 ° C. The condition that “the temperature does not decrease to −20 ° C.” can be used.

-Evaluation operation of air tightness evaluation unit-
The evaluation operation of the airtightness evaluation unit (116) is an operation to determine whether the above-described evaluation condition is satisfied. Airtightness evaluation unit of this embodiment (116), in the evaluation operation, "pump unit (35) of the second reference pressure pressure shipping the container (1) during the stop of the first reference pressure P _H P _L the time required for the drop to determine the success or failure of the evaluation condition of the is "evaluation time T _R above.

Here, the evaluation operation of the airtightness evaluation unit (116) will be described with reference to the flow chart of FIG. Further, in this description, FIG. 4 is referred to as appropriate.

When the air tightness evaluation unit (116) starts the evaluation operation, first, in step ST11, the air tightness evaluation unit (116) operates a valve provided in the internal air conditioning device (30). Specifically, the air tightness evaluation section (116) sets each of the first bypass valve (50) and the second bypass valve (70) to the second state, and the first control valve (46), the second control valve (66) The ventilation exhaust valve (101) and the measurement on-off valve (126) are set in the closed state (see FIG. 4).

In the next step ST12, the air tightness evaluation unit (116) energizes the drive motor (38) of the pump unit (35) to operate the first pump (36). The first pump (36) pressurizes the outside air sucked through the air filter (47) and then discharges it. Outside air discharged from the first pump (36) passes through the first bypass valve (50), the first bypass pipe (51) and the supply pipe (120) in this order to the inside of the transport container (1) Supplied.

In the present embodiment, when the drive motor (38) is energized, not only the first pump (36) but also the second pump (37) operates. For this reason, internal air is drawn into the second pump (37) through the internal suction pipe (75). The internal air discharged from the second pump (37) passes through the second bypass valve (70), the second bypass pipe (71) and the supply pipe (120) in this order to the inside of the transport container (1) Will be sent back.

In the next step ST13, the airtightness evaluation unit (116) reads the measurement value of the third pressure sensor (103), and stores the read measurement value as the measurement value P of the air pressure in the transport container (1) (112) Remember to). In the next step ST14, airtightness evaluation unit (116), the measured value P stored in the memory (112) in step ST13, compared with the first reference pressure P _H of the memory (112) stores in advance. The value of the first reference pressure P _H is, for example, 490 Pa (gauge pressure).

In step ST14, if the measured value P of the air pressure in the shipping container (1) does not reach the first reference pressure P _H (P <P _H), airtightness evaluation unit (116), the process returns to step ST13 The measurement value P of the third pressure sensor (103) is read again. On the other hand, in step ST14, if the measured value P of the air pressure in the shipping container (1) has reached the first reference pressure P _H (P ≧ P _H), airtightness evaluation unit (116), to step ST15 Move to stop the pump unit (35).

In the next step ST16, the airtightness evaluation unit (116) starts to measure the elapsed time T after the pump unit (35) is stopped. At this point in time, the pressure inside the shipping container (1) is positive. For this reason, air flows out from the inside of the transport container (1) to the outside through the gap of the transport container (1), and the air pressure in the transport container (1) gradually decreases.

In the next step ST17, the airtightness evaluation unit (116) reads the measurement value of the third pressure sensor (103), and stores the read measurement value as the measurement value P of the air pressure in the transport container (1) (112) Remember to). In the next step ST18, airtightness evaluation unit (116), the measured value P stored in the memory (112) in step ST17, compared to the second reference pressure P _L to the memory (112) stores in advance. The value of the second reference pressure _{P L} is, for example, 245 Pa (gauge pressure).

In step ST18, when the measured value P of the air pressure in the transport container (1) does not reach the second reference pressure P _L (P> P _L ), the airtightness evaluation unit (116) returns to step ST17. The measurement value P of the third pressure sensor (103) is read again. On the other hand, when the measured value P of the air pressure in the transport container (1) has reached the second reference pressure P _L (P ≦ P _L ) in step ST18, the airtightness evaluation unit (116) proceeds to step ST19. After the transition, the measurement of the elapsed time is ended, and the measured elapsed time T is stored in the memory (112).

In the next step ST20, airtightness evaluation unit (116), the elapsed time T measured, the memory (112) is compared with the evaluation time T _R to be stored in advance. The value of the evaluation time _{T R} is, for example, 105 seconds.

If the measured elapsed time T is equal to or more than the evaluation time T _R (T ≧ T _R ), the airtightness evaluation unit (116) proceeds to step ST21, and the airtightness of the transport container (1) is satisfied. The information (i.e., that the airtightness of the transport container (1) has reached the reference level) is recorded in the memory (112). On the other hand, if the measured elapsed time T is less than the evaluation time T _R (T <T _R ), the airtightness evaluation unit (116) proceeds to step ST22, and the airtightness of the transport container (1) is insufficient. The information (i.e., the airtightness of the transport container (1) has not reached the reference level) is recorded in the memory (112).

-Effect of Embodiment 1-
The airtightness evaluation unit (116) constituting the airtightness evaluation device (130) of the present embodiment, the first pump (36) supplies the outside air to the inside of the transportation container (1), and the transportation container (1) In a state in which the air pressure in the container is positive pressure, the airtightness of the transportation container (1) is evaluated based on the air pressure in the transportation container (1) measured by the third pressure sensor (103). For this reason, according to the present embodiment, it is possible to automatically evaluate the airtightness of the transport container (1).

Further, in the present embodiment, the first pump (36) provided in the in-compartment air conditioning device (30) doubles as the air pressure regulation device (131) of the air tightness evaluation device (130). Therefore, according to the present embodiment, it is possible to reduce the number of parts of the in-compartment air conditioner (30) including the air tightness evaluation device (130).

In addition, the airtightness evaluation unit (116) constituting the airtightness evaluation device (130) of the present embodiment is a first defect that the composition of the air inside the container of the transport container (1) does not reach the target composition. When the condition is satisfied, an evaluation operation is performed to evaluate the airtightness of the transport container (1). Therefore, according to the present embodiment, the reason why the composition of the air in the storage container for the transport (1) does not reach the target composition is the failure of the storage air conditioner (30) or the airtightness of the storage container (1) It becomes possible to determine what is.

In addition, the airtightness evaluation unit (116) constituting the airtightness evaluation device (130) of the present embodiment is a second defect indicating that the temperature of the air inside the storage container for transportation (1) does not reach the target temperature. When the condition is satisfied, an evaluation operation is performed to evaluate the airtightness of the transport container (1). Therefore, according to the present embodiment, the reason why the temperature of the air inside the transport container (1) does not reach the target temperature is the failure of the refrigerator (10) or the airtightness of the storage (1) It becomes possible to distinguish.

-Modification of Embodiment 1-
In the air tightness evaluation unit (116) of the air tightness evaluation device (130) of the present embodiment, in the evaluation operation, the air pressure change amount in the transport container (1) within a predetermined time is evaluated as the pressure change amount. The comparison may be configured to evaluate the airtightness of the shipping container (1). In the evaluation operation, the air-tightness evaluation unit (116) of this modification “in the predetermined time during which the pump unit (35) is stopped, the amount of reduction in atmospheric pressure in the transport container (1) is the pressure change amount ΔP for evaluation. It is judged whether the evaluation condition "is the following or not" is met.

Specifically, in the evaluation operation, the airtightness evaluation unit (116) of the present modification performs the operation from step ST11 to step ST15 of FIG. Then, airtightness evaluation unit (116), the measured value P _M in the air pressure in the pump unit (35) a predetermined time from the time of stopping (for example, 120 seconds) shipping container at the time has elapsed (1) It is stored in the memory (112). Next, the airtightness evaluation unit (116) calculates the difference (P _H -P _M ) between the first reference pressure P _H and the measurement value P _M stored in the memory (112). The value of (P _H -P _M ) is the amount of change in air pressure in the transport container (1) within a predetermined time from when the pump unit (35) is stopped.

The airtightness evaluation unit (116) of this modification evaluates the airtightness of the transport container (1) based on the value of (P _H -P _M ). When the value of (P _H -P _M ) is equal to or less than the predetermined pressure change amount for evaluation ΔP (P _H -P _M ≦ ΔP), the airtightness evaluation unit (116) indicates that the airtightness of the transport container (1) is Information is stored in the memory (112) indicating that the container is full (that is, the airtightness of the shipping container (1) has reached a reference level). On the other hand, when the value of (P _H -P _M ) exceeds the predetermined pressure change amount for evaluation ΔP (P _H -P _M > ΔP), the airtightness evaluation unit (116) measures the airtightness of the transport container (1) Information is stored in the memory (112) indicating that the gender is lacking (ie, the airtightness of the shipping container (1) has not reached the reference level).

<< Embodiment 2 >>
The second embodiment will be described. The airtightness evaluation device (130) incorporated in the in-compartment air conditioning device (30) of the present embodiment evaluates a plurality of (three in the present embodiment) reference levels of airtightness of the storage case (1) mutually different. Among the conditions, the operator can select one of the evaluation conditions used in the evaluation operation of the airtightness evaluation unit (116). Here, points of the in-compartment air conditioning device (30) of the present embodiment different from the in-compartment air conditioning device (30) of the first embodiment will be described.

As shown in FIG. 7, in the internal air conditioning apparatus (30) of the present embodiment, the control panel (113) of the refrigerator (10) is connected to the controller (110) via electrical wiring. . Although not shown, a display unit and a keypad or a liquid crystal touch panel are provided on the control panel (113) of the refrigerator (10). The control panel (113) is provided in the refrigerator (10) in order for the operator to input a command value (for example, a set value of the air temperature of the luggage compartment (5)) relating to the operation of the refrigerator (10).

The airtightness evaluation device (130) is provided with an input unit. In the present embodiment, the control panel (113) of the refrigerator (10) doubles as the input unit of the air tightness evaluation device (130). The operator operates the operation panel (113) to input information specifying the evaluation conditions used in the evaluation operation of the airtightness evaluation unit (116).

In the in-compartment air conditioning system (30) of the present embodiment, an evaluation time corresponding to each of the three evaluation conditions is recorded in advance in the memory (112) of the controller (110). The memory (112) stores, for example, 120 seconds as the first evaluation time _TR1 corresponding to the evaluation condition A ( _TR1 = 120 seconds), and 105 as the second evaluation time _TR2 corresponding to the evaluation condition B. The second is stored ( _TR2 = 105 seconds), and 90 seconds is stored as the third evaluation time _TR3 corresponding to the evaluation condition C ( _TR3 = 90 seconds). In the present embodiment, the reference levels of the three evaluation conditions A to C (the airtightness level of the storage (1)) are the highest in the evaluation condition A, lower in the order of the evaluation condition A, the evaluation condition B, and the evaluation condition C Become.

-Evaluation operation of air tightness evaluation unit-
Here, the evaluation operation of the airtightness evaluation unit (116) of the present embodiment will be described in terms of differences from the evaluation operation of the airtightness evaluation unit (116) of the first embodiment. Also, here, the evaluation operation of the airtightness evaluation unit (116) of the present embodiment will be described with reference to the flow chart of FIG. The flowchart of FIG. 8 is obtained by adding step ST10 to the flowchart of FIG.

When the air tightness evaluation unit (116) starts the evaluation operation, first, in step ST10, the operator stands by until one of the evaluation conditions A to C is selected.

When the operator operates the operation panel (113) and inputs information for selecting one of the evaluation conditions A to C, the airtightness evaluation unit (116) evaluates the evaluation time T _R as the selected evaluation. Set to the value corresponding to the condition. If the evaluation condition A is selected, airtightness evaluation unit (116), the evaluation time _{T R} and the first evaluation time _{_{_{T R1 (T R = T R1}}} ). If the evaluation conditions B is selected, airtightness evaluation unit (116), the evaluation time _{T R} and the second evaluation time _{_{_{T R2 (T R = T R2}}} ). If the evaluation condition C is selected, airtightness evaluation unit (116), the evaluation time _{T R} and the third evaluation time _{_{_{T R3 (T R = T R3}}} ).

And the airtightness evaluation part (116) of this embodiment performs operation from step ST11 to step ST22 as evaluation operation similarly to the airtightness evaluation part (116) of Embodiment 1, and transport container (1) Automatically assess the tightness of the

-Effect of Embodiment 2-
In the in-compartment air conditioning device (30) of the present embodiment, the airtightness evaluation unit (116) uses the one evaluation condition designated by the worker among the plurality of evaluation conditions to use the airtightness of the storage case (1). Perform evaluation operation to evaluate the gender. Therefore, according to the present embodiment, the operator can select one evaluation condition used in the evaluation operation from a plurality of evaluation conditions, and the usability of the in-compartment air conditioning device (30) is improved. .

Embodiment 3
The third embodiment will be described. The airtightness evaluation device (130) incorporated in the in-compartment air conditioning device (30) of the present embodiment is the airtightness evaluation unit (116) of the controller (110) in the airtightness evaluation device (130) of the second embodiment. Is a change in the evaluation condition for judging success or failure in the evaluation operation. Further, in the in-compartment air conditioning device (30) of the present embodiment, the configuration of the first composition adjusting unit (40) is different from the in-compartment air conditioning device (30) of the second embodiment. Here, a difference of the in-compartment air conditioning device (30) of the present embodiment from the in-compartment air conditioning device (30) of the second embodiment will be described.

-First composition control unit of air conditioning system in storage-
Regarding the first composition adjusting unit (40) of the present embodiment, differences from the first composition adjusting unit (40) of the second embodiment will be described.

As shown in FIG. 9, in the first composition adjustment unit (40) of the embodiment, the check valve (48) is provided in the first primary side pipe (53). The check valve (48) is disposed between the first separation module (41) and the first pressure sensor (45) in the first primary pipe (53). The check valve (48) allows the flow of air in the direction of outflow from the first primary outlet (43) of the first separation module (41) and prevents the flow of air in the reverse direction.

Further, in the in-compartment air conditioning device (30) of the embodiment, the outlet end of the first bypass pipe (51) is a check valve (48) and a first pressure sensor (in the first primary side pipe (53)). Connected between 45).

-Controller-
The controller (110) of the present embodiment differs from the controller (110) of the second embodiment in the evaluation conditions under which the airtightness evaluation unit (116) determines the success or failure in the evaluation operation. In the evaluation operation, the airtightness evaluation unit (116) of the present embodiment sets “the flow rate (air supply flow rate) of air supplied to the inside of the transport container (1) by the pump unit (35) to a predetermined reference value in a state, until luggage compartment predetermined reference time T ₀ from the start of the pressurization of the (5) elapses, the air pressure in the shipping container (1) reaches a predetermined evaluation for the pressure P _R of " Determine the success or failure of the evaluation conditions.

Moreover, the controller (110) of the present embodiment, like the controller (110) of the second embodiment, has a plurality of (three in the present embodiment) reference levels of airtightness of the storage case (1) different from each other. Among the evaluation conditions, the operator can select one of the evaluation conditions used in the evaluation operation of the airtightness evaluation unit (116).

The evaluation condition A is “The pressure in the transportation container (1) is 490 Pa at the time when 5 minutes have elapsed from the start of pressurization of the loading space (5) with“ the air flow rate set at 10 liters per minute It is the condition that it is "gage pressure" or more. In the evaluation condition B, “The pressure inside the transportation container (1) is 150 Pa (5 minutes after the start of pressurization of the loading space (5) in a state where the air supply flow rate is set to It is the condition that it is "gage pressure" or more. The evaluation condition C is that “the pressure inside the transportation container (1) is 150 Pa (5 minutes after the start of pressurization of the loading space (5) with the air supply flow rate set at 25 liters per It is the condition that it is "gage pressure" or more. The standard level of these three evaluation conditions A to C (the airtightness level of the storage (1)) is the highest in the evaluation condition A, and becomes lower in the order of the evaluation condition A, the evaluation condition B and the evaluation condition C.

In the memory (112) of the controller (110), the evaluation pressure and the control pressure corresponding to each of the three evaluation conditions are recorded in advance. Specifically, the memory (112), the evaluation conditions as the first evaluation pressure P _R1 and the first control pressure P _C1 corresponding to A, evaluation condition second evaluation pressure P _R2 and a second control corresponding to the B and use the pressure _{P C2,} and stores the third evaluation pressure _{P R3} and the third control pressure _{P C3} corresponding to the evaluation criteria C.

Here, the first pump (36) of the pump unit (35) has a characteristic that “the volumetric flow rate (discharge flow rate) of the discharged air decreases as the pressure (discharge pressure) of the discharged air increases. ing. That is, in the first pump (36), the discharge pressure and the discharge flow rate correlate with each other. Therefore, the memory (112), is recorded "discharge pressure when the discharge flow rate of the first pump (36) is 10 liters per minute" as a first control pressure P _C1 corresponding to the evaluation criteria A. In the memory (112), “the discharge pressure when the discharge flow rate of the first pump (36) is 20 liters per minute” is recorded as the second control pressure _PC2 corresponding to the evaluation condition B. In the memory (112), “the discharge pressure when the discharge flow rate of the first pump (36) is 25 liters per minute” is recorded as the third control pressure _PC3 corresponding to the evaluation condition C.

-Evaluation operation of air tightness evaluation unit-
The evaluation operation performed by the airtightness evaluation unit (116) of the present embodiment will be described with reference to the flow chart of FIG.

When the air tightness evaluation unit (116) starts the evaluation operation, first, in step ST30, the operator stands by until one of the evaluation conditions A to C is selected.

When the operator inputs information for selecting one of the evaluation criteria A ~ C by operating the operation panel (the 113), airtightness evaluation unit (116) is evaluated for the pressure P _R and the control pressure P _C Are set to values corresponding to the selected evaluation condition. If the evaluation condition A is selected, airtightness evaluation unit (116), an evaluation pressure _{P R} as a first evaluation pressure _{P R1} _(P R _{= P R1),} a first control for control pressure _{P C} The pressure is P _C1 (P _C = P _C1 ). When the evaluation condition B is selected, the airtightness evaluation unit (116) sets the evaluation pressure P _R as the second evaluation pressure P _R2 (P _R = P _R2 ), and the control pressure P _C for the second control. Let pressure P _C2 be (P _C = P _C2 ). If the evaluation condition C is selected, airtightness evaluation unit (116), an evaluation pressure _{P R} as a third evaluation pressure _{P R3} _(P R _{= P R3),} a third control for control pressure _{P C} The pressure is P _C3 (P _C = P _C3 ).

In the next step ST31, the airtightness evaluation unit (116) operates a valve provided in the in-compartment air conditioning device (30). Specifically, the air tightness evaluation unit (116) sets each of the first bypass valve (50) and the second bypass valve (70) to the second state (the state shown by the broken line in FIG. 9), and performs the first adjustment Set the opening degree of the valve (46) to a predetermined initial opening degree, set the ventilation exhaust valve (101) to the open state, and close the second control valve (66) and the measurement on-off valve (126) Set

In the next step ST32, the air tightness evaluation unit (116) energizes the drive motor (38) of the pump unit (35) to operate the first pump (36). The first pump (36) pressurizes the outside air sucked through the air filter (47) and then discharges it. Outside air discharged from the first pump (36) passes through the first bypass valve (50), the first bypass pipe (51) and the supply pipe (120) in this order to the inside of the transport container (1) Supplied.

However, at this time, the ventilation exhaust valve (101) is open. Therefore, even if the outside air discharged from the first pump (36) is supplied to the inside of the transport container (1), the air pressure in the transport container (1) is kept substantially the same as the atmospheric pressure. Be That is, at this point, pressurization of the loading space (5) is not yet started.

In the in-compartment air conditioning device (30) of the present embodiment, the in-compartment air is sucked into the second pump (37) and the in-compartment air discharged from the second pump (37) as in the first embodiment. Is sent back inside the shipping container (1).

In the next step ST33, the air tightness evaluation unit (116) determines that the flow rate of the outside air discharged from the first pump (36) and supplied to the inside of the transport container (1) (ie, the air supply flow rate) is The opening degree of the first control valve (46) is adjusted to be a value corresponding to the evaluation condition selected by the operator.

Specifically, the airtightness evaluation unit (116) opens the first control valve (46) so that the measurement value of the first pressure sensor (45) becomes the control pressure P _C set in step ST30. Adjust the degree. When the measured value of the first pressure sensor (45) exceeds the control pressure P _C , the airtightness evaluation unit (116) enlarges the opening degree of the first control valve (46), and the first pressure sensor (45) When the measured value of the pressure control value Pc is less than the control pressure P _C , the opening degree of the first control valve (46) is reduced.

When the measurement value of the first pressure sensor (45) is substantially maintained at the control pressure P _C , the airtightness evaluation unit (116) fixes the opening degree of the first control valve (46), Thereafter, the process proceeds to step ST34.

In step ST34, the airtightness evaluation unit (116) closes the ventilation exhaust valve (101). When the ventilation exhaust valve (101) is closed, the air pressure in the transport container (1) gradually increases. That is, pressurization of the loading space (5) starts when the ventilation exhaust valve (101) is closed. In addition, the airtightness evaluation unit (116) starts to measure the elapsed time T from the time when the ventilation exhaust valve (101) is closed (that is, when pressurization of the cargo space (5) is started).

In the next step ST35, the airtightness evaluation unit (116) reads the measurement value of the third pressure sensor (103), and stores the read measurement value as the measurement value P of the air pressure in the transport container (1) (112) Remember to). In the next step ST36, airtightness evaluation unit (116), the measured value P stored in the memory (112) in step ST35, compared to the evaluation pressure P _R, which is set at step ST30.

In step ST36, when the measured value P of the atmospheric pressure in the transport container (1) has reached the evaluation pressure P _R (P P P _R ), the reference is taken from the time when pressurization of the loading space (5) is started. Before the time T ₀ (in this embodiment, T ₀ = 5 minutes) elapses, the air pressure in the transport container (1) has reached the evaluation pressure P _R. Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST37, and the airtightness of the transport container (1) is satisfied (that is, the airtightness of the transport container (1) becomes the standard level. The information to the effect is recorded in the memory (112).

On the other hand, when the measured value P of the atmospheric pressure in the transport container (1) does not reach the evaluation pressure P _R in step ST36 (P <P _R ), the airtightness evaluation unit (116) proceeds to step ST38. Then, the elapsed time T from the start of pressurization of the loading space (5) is compared with the reference time T ₀ .

If the elapsed time T has not reached the reference time T _0, airtightness evaluation unit (116), the process returns to step ST35, it performs the operations of steps ST35 and step ST36 in order. On the other hand, if the elapsed time T has reached the reference time T _0, even if the reference time T ₀ from the time of starting the pressure of the luggage compartment (5) has passed, the measured value P reaches the evaluation pressure P _R It will not be. Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST39, and the airtightness of the transport container (1) is insufficient (that is, the airtightness of the transport container (1) becomes the standard level. The information (not reached) is recorded in the memory (112).

<< Embodiment 4 >>
The fourth embodiment will be described. The airtightness evaluation device (130) incorporated in the in-compartment air conditioning system (30) of the present embodiment is the airtightness evaluation unit (116) of the controller (110) in the airtightness evaluation device (130) of the third embodiment. Is a change in the evaluation condition for judging success or failure in the evaluation operation. Here, points different from the in-compartment air conditioning device (30) of the third embodiment will be described with respect to the in-compartment air conditioning device (30) of the present embodiment.

-Controller-
The controller (110) of the present embodiment differs from the controller (110) of the third embodiment in the evaluation conditions under which the airtightness evaluation unit (116) determines the success or failure in the evaluation operation. In the evaluation operation, the airtightness evaluation unit (116) of the present embodiment “into the inside of the transport container (1) necessary for keeping the pressure in the transport container (1) within the predetermined reference pressure range It is determined whether the evaluation condition that the flow rate (air supply flow rate) of the air to be performed is equal to or less than a predetermined evaluation flow rate _{R R} is met.

Further, the controller (110) of the present embodiment, like the controller (110) of the third embodiment, has a plurality of (three in the present embodiment) reference levels of airtightness of the storage case (1) different from each other. Among the evaluation conditions, the operator can select one of the evaluation conditions used in the evaluation operation of the airtightness evaluation unit (116).

Evaluation condition A is necessary to keep “the measured value P of the atmospheric pressure in the transport container (1) within a predetermined reference pressure range ( _PR1 ≦ P ≦ _PR1 + α, _PR1 : first evaluation pressure) The condition is that the air supply flow rate is equal to or less than the first evaluation flow rate _QR1 . The evaluation condition B is "the air supply necessary to keep the measured value P of the atmospheric pressure in the transport container (1) within the reference pressure range ( _PR2 ? P? _PR2 +?, _PR2 : second evaluation pressure) The condition is that the flow rate is less than or equal to the second evaluation flow rate _QR2 . The evaluation condition C is “the air supply necessary to keep the measured value P of the atmospheric pressure in the transport container (1) in the reference pressure range ( _PR3 ≦ P ≦ _PR3 + α, _PR3 : third evaluation pressure) The condition is that the flow rate is less than or equal to the third evaluation flow rate _QR3 . In the present embodiment, the value of “α” is set to, for example, 10 Pascal (Pa). The standard level of these three evaluation conditions A to C (the airtightness level of the storage (1)) is the highest in the evaluation condition A, and becomes lower in the order of the evaluation condition A, the evaluation condition B and the evaluation condition C.

In the memory (112) of the controller (110), an evaluation pressure and an evaluation flow rate corresponding to each of the three evaluation conditions are recorded in advance. Specifically, the memory (112), the evaluation condition first evaluation pressure corresponding to A P _R1 and the first evaluation flow Q _R1, evaluation condition second evaluation pressure P _R2 and a second evaluation corresponding to B the use flow rate _{Q R2,} stores a third evaluation pressure _{P R3} and the third evaluation flow _{Q R3} corresponding to the evaluation criteria C. However, the first to third evaluation pressure values stored in the memory (112) of the controller (110) of the present embodiment are the first values stored in the memory (112) of the controller (110) of the third embodiment. ~ Different from the value of the third evaluation pressure.

When the air tightness evaluation unit (116) starts the evaluation operation, first, in step ST50, the operator stands by until one of the evaluation conditions A to C is selected.

When the operator inputs information for selecting one of the evaluation criteria A ~ C by operating the operation panel (the 113), airtightness evaluation unit (116) is evaluated for the pressure P _R for evaluation flow Q _R Are set to values corresponding to the selected evaluation condition. If the evaluation condition A is selected, airtightness evaluation unit (116), an evaluation pressure _{P R} as a first evaluation pressure _{P R1} _(P R _{= P R1),} a first evaluation of the evaluation rate _{Q R} It is assumed that the flow rate Q _R1 (Q _R = Q _R1 ). If the evaluation conditions B is selected, airtightness evaluation unit (116), an evaluation pressure _{P R} as a second evaluation pressure _{P R2} _(P R _{= P R2),} a second evaluation of the evaluation rate _{Q R} It is assumed that the flow rate Q _R2 (Q _R = Q _R2 ). If the evaluation condition C is selected, airtightness evaluation unit (116), an evaluation pressure _{P R} as a third evaluation pressure _{P R3} _(P R _{= P R3),} a third evaluation the evaluation flow _{Q R} It is assumed that the flow rate Q _R3 (Q _R = Q _R3 ).

In the next step ST51, the airtightness evaluation unit (116) operates a valve provided in the in-compartment air conditioning device (30). Specifically, the air tightness evaluation unit (116) sets each of the first bypass valve (50) and the second bypass valve (70) to the second state (the state shown by the broken line in FIG. 9), and performs the first adjustment Set the opening degree of the valve (46) to a predetermined initial opening degree (for example, full opening state) and close the second control valve (66), the ventilation exhaust valve (101) and the measurement on-off valve (126) Set

In the next step ST52, the air tightness evaluation unit (116) energizes the drive motor (38) of the pump unit (35) to operate the first pump (36). The first pump (36) pressurizes the outside air sucked through the air filter (47) and then discharges it. Outside air discharged from the first pump (36) passes through the first bypass valve (50), the first bypass pipe (51) and the supply pipe (120) in this order to the inside of the transport container (1) Supplied.

In the next step ST53, airtightness evaluation unit (116) includes a measurement of the elapsed time T _A by the timer A, a measurement of the elapsed time T _B by the timer B, and started at the same time.

In the next step ST54, the airtightness evaluation unit (116) reads the measurement value of the third pressure sensor (103), and stores the read measurement value as the measurement value P of the air pressure in the transport container (1) (112) Remember to). The memory (112) stores not only the measurement value of the third pressure sensor (103) at that time (ie, the latest measurement value P) but also the past measurement value P.

In the next step ST55, airtightness evaluation unit (116), the measurement value is stored in the memory (112) in the immediately preceding step ST54 P (i.e., the latest measured value P) and a value of (P R ₊ alpha) Compare. P _R is the evaluation pressure set in step ST50.

Step If exceeded the latest measured value P a (P R ₊ alpha) in ST55 (P> P R ₊ alpha) is in the pressure of the supply air flow rate is too high in a shipping container (1) is too high Become. Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST56, and reduces the opening degree of the first control valve (46) to reduce the air supply flow rate. At this time, the airtightness evaluation unit (116) reduces the opening degree of the first control valve (46) by a predetermined constant value.

On the other hand, if the latest measured value P is less than (P _R + α) in step ST55 (P ≦ P _R + α), the airtightness evaluation unit (116) proceeds to step ST57 and evaluates the latest measured value P. compared to the use pressure _{P R.}

If the latest measurement value P is less than P _R in step ST 57 (P <P _R ), the air flow rate is too low, and the air pressure in the transport container (1) is not sufficiently increased. Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST58, and enlarges the opening degree of the first control valve (46) in order to increase the air supply flow rate. At that time, the airtightness evaluation unit (116) enlarges the opening degree of the first control valve (46) by a predetermined constant value.

If the supply air flow rate is changed in step ST56 or step ST58, so that the measured value P of the air pressure in the shipping container (1) is outside the reference pressure range _{_{(P R ≦ P ≦ P R}} + α) . Therefore, in this case, airtightness evaluation unit (116), the process proceeds to step ST59, the elapsed time T _B the timer B is measured reset to zero and resumes elapsed time measurement T _B by the timer B. Thereafter, the airtightness evaluation unit (116) proceeds to step ST60.

On the other hand, when the latest measured value P is greater than P _R in step ST 57 (P (P _R ), the measured value P of the atmospheric pressure in the transport container (1) is within the reference pressure range (P _R ≦ P ≦ P _R It will be in + α). In this case, the airtightness evaluation unit (116) proceeds to step ST60.

In step ST60, the airtightness evaluation unit (116) determines the flow rate of the outside air supplied to the inside of the transport container (1) by the first pump (36) at that time (that is, the air supply flow rate Q at that time). Calculate

As described in the description of the third embodiment, the first pump (36) of the pump unit (35) sets the “volume flow (discharge flow) of the discharged air as the pressure (discharge pressure) of the discharged air increases. The characteristic is that the Therefore, in step ST57, the air tightness evaluation unit (116) measures the correlation between the discharge pressure and the discharge flow rate of the first pump (36) and the measurement value of the first pressure sensor (45) (ie, the first pump (36). The air supply flow rate Q is calculated using the measured value of the discharge pressure of.

In the next step ST61, the airtightness evaluation unit (116) compares the elapsed time TB measured by the timer _B with a predetermined reference time _TB0 (in this embodiment, _TB0 = 10 minutes).

If the elapsed time _{T B} has reached the reference time _{T B0} in _{(T B} ≧ _{T B0)} step ST61, the air pressure in the shipping container (1) is over the reference time _{T B0} above, the reference pressure range ( P _R ≦ P ≦ P _R + α) is maintained. That is, in this case, the air pressure in the transport container (1) is kept approximately constant. Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST62, and the air supply flow rate Q calculated in step ST60 (ie, the latest air supply flow rate Q) is set to the evaluation flow rate Q set in step ST50. Compare with _R.

If the latest air supply flow rate Q is less than or equal to the evaluation flow rate Q _R in step ST 62 (Q Q Q _R ), the atmospheric pressure in the transport container (1) is set to the reference pressure range (P _R ≦ P ≦ P _R + α) supply flow rate required to keep the results in at most evaluation flow Q _R. Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST63, and the airtightness of the transport container (1) is satisfied (that is, the airtightness of the transport container (1) becomes the standard level. The information to the effect is recorded in the memory (112).

On the other hand, if the latest of the supply flow rate Q over the evaluation flow Q _R in Step ST62 (Q> Q _R) is the reference pressure range pressure in the shipping container _{(1) (P R ≦ P} ≦ P R + α supply flow rate required to keep) becomes that exceeds the evaluation flow Q _R. Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST64, and the airtightness of the transport container (1) is insufficient (ie, the airtightness of the transport container (1) becomes the standard level. The information (not reached) is recorded in the memory (112).

If the elapsed time _{T B} in step ST61 does not reach the reference time _{T B0} _(T B _{<T B0),} airtightness evaluation unit (116), the process proceeds to step ST65, the elapsed time _{T A} timer A is measured , And a predetermined reference time T _A0 (in the present embodiment, T _A0 = 20 minutes).

If the elapsed time T _A has reached the reference time T A ₀ in step ST 65 (T _A TT _A ₀ ), a relatively long time (20 minutes in the present embodiment) has already elapsed from the start of the evaluation operation. become. Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST66. On the other hand, if the elapsed time T _A has not reached the reference time T A ₀ in step ST 65 (T _A <T _A ₀ ), the airtightness evaluation unit (116) returns to step ST 54 and performs the above-described series of operations again.

In step ST66, air tightness evaluation unit (116) first calculates the average value Q _m of the air supply flow rate Q during the period from that point until 10 minutes ago. At this time, airtightness evaluation unit (116) uses the past air supply flow rate Q which is recorded in the memory (112), calculates the average value Q _m of the air supply flow rate Q. Then, airtightness evaluation unit (116), an average value Q _m of the calculated air intake amount, compared to the evaluation flow Q _R set in step ST50.

When the average value Q _m of the air intake amount is less evaluation flow Q _R in Step ST66 (Q _m ≦ Q _R) is a relatively long time adjusting the supply air flow over (20 minutes in this embodiment) to in the state in which continued, so that the average value Q _m of the air intake amount is suppressed to a relatively low value. Therefore, in this case, the supply air flow rate required to maintain the air pressure in the shipping container (1) to the reference pressure range _{_{(P R ≦ P ≦ P R}} + α) is, at substantially less than the evaluation flow Q _R It can be determined that there is. Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST67, and the airtightness of the transport container (1) is satisfied (that is, the airtightness of the transport container (1) becomes the standard level. The information to the effect is recorded in the memory (112).

On the other hand, when the average value Q _m of the air intake amount is greater than an evaluation flow _{_{Q R (Q m> Q R}} ) is a step ST66, the supply air flow rate over a relatively long time (20 minutes in this embodiment) in the state continued to adjust, so that the average value Q _m of the air intake amount is a relatively high value. Therefore, in this case, the supply air flow rate required to maintain the air pressure in the shipping container (1) to the reference pressure range _{_{(P R ≦ P ≦ P R}} + α) is greater than the substantially evaluation flow Q _R It can be determined that Therefore, in this case, the airtightness evaluation unit (116) proceeds to step ST68, and the airtightness of the transport container (1) is insufficient (ie, the airtightness of the transport container (1) becomes the standard level. The information (not reached) is recorded in the memory (112).

-Modification of Embodiment 4-
The airtightness evaluation device (130) of the present embodiment may include a flow rate sensor for measuring the flow rate (air supply flow rate) of air supplied to the inside of the transport container (1). This flow rate sensor is provided, for example, on the first primary side pipe (53) of the first composition adjustment unit (40), and measures the volumetric flow rate of air flowing through the first primary side pipe (53). The airtightness evaluation unit (116) of the controller (110) of the present modification reads the measured value of the flow sensor at step ST60 of the flow chart of FIG. The measurement value is recorded in the memory (112).

Embodiment 5
The fifth embodiment will be described. Here, points of the in-compartment air conditioning device (30) of the present embodiment different from the in-compartment air conditioning device (30) of the first embodiment will be described. The present embodiment can also be applied to the in-compartment air conditioning device (30) of the second to fourth embodiments.

As shown in FIG. 12, the in-compartment air conditioning device (30) of the present embodiment is different from the in-compartment air conditioning device (30) of the first embodiment in the inlet side switching valve (140) and the inlet side branch pipe (141). And are added. The inlet-side switching valve (140) and the inlet-side branch pipe (141) are provided with an air conditioner for controlling the inside of the storage container so that outside air can be supplied to the inside of the transport container (1) by the second pump (37). 30).

The inlet side switching valve (140) is a switching valve having three ports. The inlet-side switching valve (140) has a first state (shown by a solid line in FIG. 12) in which the first port communicates with the second port and is shut off from the third port; It is configured to be in communication with the third port and to switch to a second state (state shown by a broken line in FIG. 12) which is shut off from the second port.

The inlet side switching valve (140) is disposed in the middle of the storage inner suction pipe (75). In the inlet side switching valve (140), the first port is connected to the suction port of the second pump (37), and the second port is connected to the secondary flow passage (29b) via the storage inner suction pipe (75) It communicates. One end of an inlet side branch pipe (141) is connected to a third port of the inlet side switching valve (140). The other end of the inlet side branch pipe (141) is connected to the storage outside suction pipe (55).

The inlet side switching valve (140) is set to the first state in the oxygen concentration reducing operation, the carbon dioxide concentration reducing operation, and the oxygen concentration increasing operation of the internal air conditioning device (30). Further, the inlet side switching valve (140) is set to the second state in the evaluation operation of the air tightness evaluation unit (116).

The airtightness evaluation device (130) of the present embodiment includes the airtightness of the first composition adjusting unit (40), the second composition adjusting unit (60), the third pressure sensor (103), and the controller (110). It comprises an evaluation part (116), an inlet side switching valve (140), and an inlet side branch pipe (141). Further, in the present embodiment, both the first pump (36) and the second pump (37) provided in the pump unit (35) are used for transportation in order to make the air pressure in the cargo compartment (5) a positive pressure. The air pressure regulator (131) for supplying air to the inside of the container (1) is configured.

In the airtightness evaluation device (130) of the present embodiment, the airtightness evaluation unit (116) of the controller (110) sets the inlet-side switching valve (140) in the second state in the step corresponding to step ST11 in FIG. Set to As shown in FIG. 13, when the inlet side switching valve (140) is set to the second state, both the suction port of the first pump (36) and the suction port of the second pump (37) In communication with the pipe (55), both the first pump (36) and the second pump (37) suck outside air.

Outside air discharged from the first pump (36) passes through the first bypass valve (50), the first bypass pipe (51) and the supply pipe (120) in this order to the inside of the transport container (1) Supplied. The outside air discharged from the second pump (37) passes through the second bypass valve (70), the second bypass pipe (71) and the supply pipe (120) in this order to the inside of the transport container (1) Supplied.

Thus, the airtightness evaluation device (130) of the present embodiment supplies outside air to the inside of the transport container (1) by both the first pump (36) and the second pump (37). Can. Therefore, in the present embodiment, the air pressure in the transport container (1) (specifically, compared to the case where outside air is supplied to the inside of the transport container (1) only by the first pump (36) the third pressure sensor measurement value P (103)) is the time to reach the first reference pressure P _H is shortened.

Embodiment 6
The sixth embodiment will be described. Here, a difference of the in-compartment air conditioning device (30) of the present embodiment from the in-compartment air conditioning device (30) of the fifth embodiment will be described.

As shown in FIG. 14, the air conditioning device for internal storage (30) of the present embodiment differs from the air conditioning device for internal storage (30) of the fifth embodiment in the switching valve for pressure measurement (145) and piping for pressure measurement. (146) is added and the third pressure sensor (103) is omitted. The air pressure measurement switching valve (145) and the air pressure measurement pipe (146) are provided with the in-compartment air conditioner (30) so that the air pressure in the transport container (1) can be measured by the second pressure sensor (65). Provided).

The air pressure measurement switching valve (145) is a switching valve having three ports. The air pressure measurement switching valve (145) has a first state (shown by a solid line in FIG. 14) in which the first port communicates with the second port and is shut off from the third port; It is configured to be in communication with the third port and to switch to a second state (state shown by a broken line in FIG. 14) which is disconnected from the second port.

The air pressure measurement switching valve (145) is disposed between the second separation module (61) and the second pressure sensor (65) in the second primary side pipe (73). The first port of the switching valve for air pressure measurement (145) is connected to the second control valve (66), and the second port is connected to the second primary outlet (63) of the second separation module (61) Do. One end of a pressure measurement pipe (146) is connected to a third port of the pressure measurement switching valve (145). The other end of the pressure measurement pipe (146) is connected to the storage inner suction pipe (75).

The air pressure measurement switching valve (145) is set to the first state in the oxygen concentration reduction operation, the carbon dioxide concentration reduction operation, and the oxygen concentration increase operation of the inside air conditioning device (30). Further, the air pressure measurement switching valve (145) is set to the second state in the evaluation operation of the air tightness evaluation unit (116).

The airtightness evaluation device (130) of the present embodiment includes the airtightness of the first composition adjusting unit (40), the second composition adjusting unit (60), the second pressure sensor (65), and the controller (110). The evaluation unit (116), the inlet side switching valve (140), the inlet side branch pipe (141), the air pressure measurement switching valve (145), and the air pressure measurement piping (146).

In the air tightness evaluation device (130) of the present embodiment, the air tightness evaluation unit (116) of the controller (110) performs the second air pressure measurement switching valve (145) in the step corresponding to step ST11 of FIG. Set to state. As shown in FIG. 15, when the air pressure measurement switching valve (145) is set to the second state, the second pressure sensor (65) is connected to the air pressure measurement pipe (146) and the storage inner suction pipe (75). It communicates with the secondary flow passage (29b) of the in-compartment air flow passage (29).

As described above, during the stop of the internal fan (17), the air pressure in the secondary flow passage (29b) is substantially equal to the air pressure in the loading space (5). For this reason, while the internal fan (17) is stopped, the measurement value of the second pressure sensor (65) substantially matches the air pressure in the loading space (5). Therefore, in the present embodiment, the second pressure sensor (65) constitutes an air pressure sensor that measures the air pressure in the loading space (5). Then, the airtightness evaluation unit (116) of the controller (110) of the present embodiment reads the measurement value of the second pressure sensor (65) in steps corresponding to step ST13 and step ST17 of FIG. The read measurement value is stored in the memory (112) as the measurement value P of the air pressure in the transport container (1).

In the present embodiment, the second pressure sensor (65) can be used to measure the air pressure in the transport container (1). Therefore, according to the present embodiment, it is possible to reduce the number of pressure sensors in the in-compartment air conditioner (30) in which the air tightness evaluation device (130) is incorporated.

Embodiment 7
The seventh embodiment will be described. Here, a difference of the in-compartment air conditioning device (30) of the present embodiment from the in-compartment air conditioning device (30) of the sixth embodiment will be described.

As shown in FIG. 16, the difference between the in-compartment air conditioner (30) of the present embodiment and the in-compartment air conditioner (30) of the sixth embodiment is that the second composition control unit (60) (75), the point that the inlet side switching valve (140) and the inlet side branch pipe (141) are omitted, the arrangement of the atmospheric pressure measuring switching valve (145), and the configuration of the atmospheric pressure measuring pipe (146) is there.

In the cold air control apparatus (30) of the present embodiment, the air pressure measurement switching valve (145) is between the first separation module (41) and the first pressure sensor (45) in the first primary side pipe (53). Will be placed. The first port of the switching valve for air pressure measurement (145) is connected to the first control valve (46), and the second port is connected to the first primary outlet (43) of the first separation module (41) Do. One end of a pressure measurement pipe (146) is connected to a third port of the pressure measurement switching valve (145). The other end of the pressure measurement pipe (146) opens into the secondary flow passage (29b) of the internal air flow passage (29).

The airtightness evaluation device (130) of the present embodiment includes a first composition adjustment unit (40), a first pressure sensor (45), an airtightness evaluation unit (116) of the controller (110), and pressure measurement. It is comprised by the switching valve (145) and piping (146) for pressure measurement.

In the air tightness evaluation device (130) of the present embodiment, the air tightness evaluation unit (116) of the controller (110) performs the second air pressure measurement switching valve (145) in the step corresponding to step ST11 of FIG. Set to state. As shown in FIG. 17, when the air pressure measurement switching valve (145) is set to the second state, the first pressure sensor (45) receives the air flow path in the storage via the air pressure measurement pipe (146). It communicates with the secondary flow path (29b) of (29).

As described above, during the stop of the internal fan (17), the air pressure in the secondary flow passage (29b) is substantially equal to the air pressure in the loading space (5). For this reason, while the internal fan (17) is stopped, the measurement value of the first pressure sensor (45) substantially matches the air pressure in the loading space (5). Therefore, in the present embodiment, the first pressure sensor (45) constitutes an air pressure sensor that measures the air pressure in the loading space (5). And the airtightness evaluation part (116) of the controller (110) of this embodiment reads the measured value of the 1st pressure sensor (45) in the step corresponded to each of step ST13 and step ST17 of FIG. The read measurement value is stored in the memory (112) as the measurement value P of the air pressure in the transport container (1).

In the present embodiment, the first pressure sensor (45) can be used to measure the air pressure in the transport container (1). Therefore, according to the present embodiment, it is possible to reduce the number of pressure sensors in the in-compartment air conditioner (30) in which the air tightness evaluation device (130) is incorporated.

<< Embodiment 8 >>
The eighth embodiment will be described. The in-compartment air conditioning apparatus (30) of the present embodiment is a modification of the in-compartment air conditioning apparatus (30) of the first embodiment in the evaluation operation performed by the air-tightness evaluation unit (116). Here, points of the in-compartment air conditioning device (30) of the present embodiment different from the in-compartment air conditioning device (30) of the first embodiment will be described.

Airtightness evaluation unit of this embodiment (116), in the evaluation operation, the measured value P of the air pressure in the shipping container (1), the first reference pressure P _H or more predetermined pressure range for a predetermined holding time The air tightness of the transport container (1) is evaluated based on the change in the measurement value P of the air pressure in the transport container (1).

The evaluation operation performed by the airtightness evaluation unit (116) of the present embodiment will be described with reference to the flow chart of FIG. In the evaluation operation, the airtightness evaluation unit (116) of the present embodiment performs the operations shown in step ST15-1 and step ST15-2 in FIG. 18 instead of the operation shown in step ST15 in FIG.

The operations performed by the airtightness evaluation unit (116) of this embodiment in steps ST11 to ST14 of FIG. 18 are the same as the operations performed by the airtightness evaluation unit (116) of the first embodiment in steps ST11 to ST14 of FIG. It is. In step ST14, when the measured value P of the air pressure in the transport container (1) has reached the first reference pressure P _H (P ≧ P _H ), the airtightness evaluation unit (116) of the present embodiment performs the step Move to ST15-1.

In step ST15-1, the airtightness evaluation unit (116) monitors the measured value P of the air pressure in the transport container (1) (in this embodiment, the measured value of the third pressure sensor (103)), The pump unit (35) is controlled so that the measured value P is maintained in the range (P _H ≦ P ≦ P _H ′) below the pressure value P _H ′ at the first reference pressure P _H or higher. The value of the first reference pressure P _H is, for example, 490 Pa (gauge pressure). The value of the pressure value P _H ′ is, for example, 500 Pa (gauge pressure).

Specifically, the airtightness evaluation unit (116) stops the pump unit (35) when the measured value P exceeds the pressure value P _H 'during operation of the pump unit (35), and When the measurement value P during the stop is below a first reference pressure P _H, actuates the pump unit (35). The airtightness evaluation unit (116) performs this operation for a predetermined holding time T _H (in this embodiment, 10 minutes).

When step ST15-1 ends, the airtightness evaluation unit (116) proceeds to step ST15-2 and holds the pump unit (35) in the stop state. Specifically, when the pump unit (35) is operating at the end of step ST15-1, the airtightness evaluation unit (116) stops the pump unit (35) and stops the pump unit (35). keep. When the pump unit (35) is stopped at the end of step ST15-1, the air tightness evaluation unit (116) keeps the pump unit (35) in the stopped state.

When step ST15-2 ends, the airtightness evaluation unit (116) of the present embodiment performs the operation shown in steps ST16 to ST22 of FIG. The operations shown in step ST16 to step ST22 of FIG. 18 are the same as the operations performed by the airtightness evaluation unit (116) of the first embodiment in step ST16 to step ST22 of FIG.

-Effect of Embodiment 8-
Here, when the air pressure in the transport container (1) is raised to a pressure higher than the atmospheric pressure, the transport container (1) may be deformed so as to expand. When the transport container (1) expands, the internal volume of the transport container (1) increases and the air pressure in the transport container (1) decreases. In addition, as the air pressure in the transport container (1) increases, the amount of air entering the heat insulating material provided in the transport container (1) increases. When air enters the insulation of the shipping container (1), the air pressure in the shipping container (1) decreases. Moreover, in the loading chamber (5) of the transport container (1), the air pressure in each part may be transiently uneven. In this case, as time passes, the air pressure is equalized in the loading space (5) of the shipping container (1), and as a result, the measured value of the air pressure in the shipping container (1) changes.

In the evaluation operation airtightness evaluation unit (116) performs, when stopping the pump unit (35) immediately after the measured value P of the air pressure in the shipping container (1) has reached the first reference pressure P _H, the previous paragraph Due to the reasons described in the above, the measured value P of the air pressure in the shipping container (1) may decrease. When the air pressure in the transport container (1) is lowered due to the deformation of the transport container (1), the airtightness evaluation unit (116) actually ensures that the transport container (1) is airtight. Nevertheless, there is a risk that it may be misjudged that the airtightness of the transport container (1) is insufficient.

Therefore, airtightness evaluation unit of this embodiment (116), after the measured value P of the air pressure in the shipping container (1) has reached the first reference pressure P _H, the air pressure in the shipping container (1) The measured value P is maintained in a predetermined pressure range (P _H ≦ P ≦ P _H ′). Then, the airtightness evaluation unit (116) determines the airtightness of the transport container (1) after the transport container (1) is deformed due to the increase of the air pressure in the transport container (1). Therefore, according to the present embodiment, it is possible to reduce the possibility of erroneously determining that the airtightness is insufficient for the transport container (1) in which the airtightness is secured.

-Modification of Embodiment 8-
The operation of step ST15-1 and step ST15-2 of FIG. 18 performed by the airtightness evaluation unit (116) of the present embodiment may be performed by the airtightness evaluation unit (116) of the second embodiment. The airtightness evaluation unit (116) of the second embodiment to which this modification is applied executes the operations of step ST15-1 and step ST15-2 of FIG. 18 instead of the operation of step ST15 of FIG.

Embodiment 9
An indoor air conditioner (30) of a ninth embodiment will be described. The in-compartment air conditioning device (30) of the embodiment is obtained by modifying the first composition adjustment unit (40) and the controller (110) in the in-compartment air conditioning device (30) of the first embodiment. Here, points of the in-compartment air conditioning device (30) of the present embodiment different from the in-compartment air conditioning device (30) of the first embodiment will be described.

-Configuration of first composition control unit-
The first composition control unit (40) of the present embodiment, like the first composition control unit (40) of the first embodiment, the outside air sucked from the outside of the transport container (1) (untreated outside air) ) Is separated into first outside air and second outside air. The first composition adjustment unit (40) of the present embodiment is configured to separate untreated outside air into first outside air and second outside air by a so-called PSA (Pressure Swing Adsorption) method. This differs from the first composition adjusting unit (40) of the first embodiment in this respect.

As shown in FIG. 19, the first composition adjusting unit (40) of the present embodiment includes an air pump (231) instead of the first pump (36) of the pump unit (35). That is, in the in-compartment air conditioning device (30) of the present embodiment, the pump unit (35) includes the second pump (37) and the drive motor (38) but does not include the first pump (36). In addition, the first composition adjustment unit (40) of the present embodiment includes the first direction control valve (232) and the second direction control valve (233), the first suction cylinder (234) and the second suction cylinder (235). And As described later, each adsorption column (234, 235) is provided with an adsorbent that adsorbs nitrogen in the air.

<air pump>
The air pump (231) is disposed in the internal space of the unit case (32). The air pump (231) includes a first pump mechanism (231a) and a second pump mechanism (231b) that respectively suck, pressurize and discharge air. The first pump mechanism (231a) and the second pump mechanism (231b) are oilless pumps that do not use lubricating oil. In the present embodiment, the first pump mechanism (231a) of the first composition adjusting unit (40) doubles as an air pressure adjusting device (131) of the air tightness evaluation device (130).

Both of the first pump mechanism (231a) as the pressurizing part and the second pump mechanism (231b) as the depressurizing part are connected to the drive shaft of the drive motor (231c). Each of the first pump mechanism (231a) and the second pump mechanism (231b) is rotationally driven by the drive motor (231c) to suck and pressurize air from the suction port and pressurize the air Are discharged from the discharge port.

<External trachea, discharge pipe, filter unit>
One end of an outer trachea (241) forming an outer air passage is connected to the suction port of the first pump mechanism (231a). The outer trachea (241) is provided to penetrate the unit case (32). The other end of the outer trachea (241) located outside the unit case (32) is connected to the filter unit (220).

The filter unit (220) comprises an air filter (47). The air filter (47) is a filter for capturing dust, salt and the like contained in the outside air. In the present embodiment, a membrane filter having breathability and waterproofness is used as the air filter (47). The filter unit (220) is a box-shaped member and introduces the air (outside storage air) that has passed through the air filter (47) into the outer trachea (241). Although not shown, the filter unit (220) is disposed downstream of the condenser (13) in the external storage compartment (28).

One end of a discharge pipe (242) forming a discharge passage is connected to the discharge port of the first pump mechanism (231a). The discharge pipe (242) branches into two branch pipes at the other end side, one branch pipe to the first direction control valve (232) and the other branch pipe to the second direction control valve (233). , Each connected.

<Suction pipe, supply pipe>
One end of a suction pipe (243) forming a suction passage is connected to the suction port of the second pump mechanism (231b). The suction pipe (243) branches into two branch pipes at the other end side, one branch pipe to the first direction control valve (232) and the other branch pipe to the second direction control valve (233). , Each connected.

One end of a supply connection pipe (244) forming a supply passage is connected to the discharge port of the second pump mechanism (231b). The other end of the supply connection pipe (244) is connected to the supply pipe (120).

The supply connection pipe (244) is provided with a check valve (264) and a supply side on-off valve (273) in this order from one end to the other end. The check valve (264) allows only the flow of air from one end of the supply connection pipe (244) to the other end, and prevents backflow of air. The supply side on-off valve (273) is an on-off valve composed of a solenoid valve.

<Direction control valve>
Each of the first direction control valve (232) and the second direction control valve (233) is a switching valve having three ports. Each directional control valve (232, 233) has a first state in which the first port communicates with the second port and is shut off from the third port, and the first port communicates with the third port in the second state And a second state where it is disconnected from the port of.

The first direction control valve (232) has a first port connected to one end of the first suction cylinder (234). In the first direction control valve (232), the branch pipe of the discharge pipe (242) is connected to the second port, and the branch pipe of the suction pipe (243) is connected to the third port. The first direction control valve (232) switches the first suction cylinder (234) between the state in which it is in communication with the first pump mechanism (231a) and the state in which it is in communication with the second pump mechanism (231b).

The second direction control valve (233) has a first port connected to one end of a second suction cylinder (235). In the second direction control valve (233), the branch pipe of the discharge pipe (242) is connected to the second port, and the branch pipe of the suction pipe (243) is connected to the third port. The second direction control valve (233) switches the second suction cylinder (235) between the state of communicating with the first pump mechanism (231a) and the state of communicating with the second pump mechanism (231b).

<Suction cylinder>
Each of the first adsorption column (234) and the second adsorption column (235) is a member provided with a cylindrical container whose both ends are closed and an adsorbent filled in the container.

The adsorbent filled in these adsorption columns (234, 235) has the property of adsorbing the nitrogen component in a pressurized state where the pressure is higher than atmospheric pressure and desorbing the nitrogen component in a decompressed state where the pressure is lower than atmospheric pressure. In the present embodiment, as an adsorbent, for example, a porous zeolite having pores with a pore diameter smaller than the molecular diameter (3.0 angstroms) of nitrogen molecules and larger than the molecular diameter (2.8 angstroms) of oxygen molecules. Is used.

In the first composition adjustment unit (40) of the present embodiment, the first adsorption cylinder (234) and the second adsorption cylinder (235) constitute a first separation unit (41). The two adsorption cylinders (234, 235) constituting the first separation part (41) are the first outside air, which has a nitrogen concentration higher than that of the untreated outside air and a lower oxygen concentration than the untreated outside air. It separates into 2nd outside air whose nitrogen concentration is lower than processing outside air and oxygen concentration is high.

<Oxygen exhaust tube>
The oxygen discharge pipe (245) forming the oxygen discharge passage is branched into two branch pipes at one end side, one branch pipe being the other end of the first adsorption column (234), the other branch pipe being the first 2. Connected to the suction cylinder (235) respectively. One check valve (261) is provided in each branch pipe of the oxygen discharge pipe (245). Each check valve (261) permits the flow of air directed out of the corresponding adsorption column (234, 235) and blocks the flow of air in the opposite direction.

An oxygen discharge pipe (245) is provided to penetrate the unit case (32). The other end of the oxygen discharge pipe (245) opens to the outside space of the transport container (1). The collecting portion of the oxygen discharge pipe (245) is provided with a check valve (262) and an orifice (263). The check valve (262) is disposed closer to the other end of the oxygen discharge pipe (245) than the orifice (263). The check valve (262) allows the flow of air toward the other end of the oxygen discharge pipe (245) and blocks the flow of air in the opposite direction.

<Purge pipe>
A purge pipe (250) forming a purge passage is connected to each branch pipe of the oxygen discharge pipe (245). The purge pipe (250) is connected to a branch pipe having one end connected to the first adsorption column (234) and the other end connected to a branch pipe connected to the second adsorption column (235). One end of the purge pipe (250) is connected between the first adsorption cylinder (234) and the check valve (261). The other end of the purge pipe (250) is connected between the second adsorption cylinder (235) and the check valve (261).

The purge pipe (250) is provided with a purge valve (251). The purge valve (251) is an on-off valve composed of a solenoid valve. The purge valve (251) is opened when the first adsorption cylinder (234) and the second adsorption cylinder (235) are equalized. Further, one orifice (252) is provided on each side of the purge valve (251) in the purge pipe (250).

<Connection pipe for exhaust>
An exhaust connection pipe (271) forming an exhaust connection passage is connected to the supply connection pipe (244). One end of the exhaust connection pipe (271) is connected to the supply connection pipe (244), and the other end is connected to the oxygen discharge pipe (245). One end of the exhaust connection pipe (271) is connected between the second pump mechanism (231 b) and the check valve (264) in the supply connection pipe (244). The other end of the exhaust connection pipe (271) is connected outside the check valve (262) of the oxygen discharge pipe (245).

The exhaust connection pipe (271) is provided with an exhaust on-off valve (272). The exhaust on-off valve (272) is an on-off valve composed of a solenoid valve. The exhaust on-off valve (272) is opened when the air flowing through the supply connection pipe (244) is exhausted out of the storage.

<Connection pipe for measurement>
The supply connection pipe (244) is connected to a measurement connection pipe (281) which forms a measurement passage. The measurement connection pipe (281) is a pipe for connecting the first composition adjusting unit (40) to the sensor unit (90).

One end of the measurement connection pipe (281) is connected to the supply connection pipe (244), and the other end is connected to the measurement pipe (125). One end of the measurement connection pipe (281) is connected between the check valve (264) and the supply side on-off valve (273) in the supply connection pipe (244). The other end of the measurement connection pipe (281) is connected between the measurement on-off valve (126) and the sensor unit (90) in the measurement pipe (125).

The measurement connection pipe (281) is provided with a measurement on-off valve (282). The measurement on-off valve (282) is an on-off valve composed of a solenoid valve. The measurement on-off valve (282) is opened when air flowing through the supply connection pipe (244) is sent to the sensor unit (90).

<Bypass pipe>
A bypass connection pipe (255) forming a bypass passage is connected to the discharge pipe (242). One end of the bypass connection pipe (255) is connected to the discharge pipe (242), and the other end is connected to the measurement connection pipe (281). One end of the bypass connection pipe (255) is connected closer to the first pump mechanism (231a) than the branch point of the discharge pipe (242). The other end of the bypass connection pipe (255) is connected between one end of the measurement connection pipe (281) and the measurement on-off valve (282). The bypass connection pipe (255) is a first bypass for bypassing the first suction cylinder (234) and the second suction cylinder (235) to supply the outside air to the inside space of the transport container (1). Form a passage.

The bypass connection pipe (255) is provided with a bypass on-off valve (256). The bypass on-off valve (256) is an on-off valve composed of a solenoid valve. The bypass on-off valve (256) constitutes a first bypass valve mechanism for changing the flow rate of the outside air flowing into the bypass connection pipe (255). The bypass on-off valve (256) is opened when supplying the outside air discharged by the first pump mechanism (231a) to the loading space (5) without changing its composition.

-Driving operation of the first composition adjustment unit-
The driving | operation operation | movement of the 1st composition adjustment part (40) of this embodiment is demonstrated.

The first composition adjustment unit (40) of the present embodiment repeats the first operation and the second operation described later alternately by predetermined time (for example, 14.5 seconds) for each time. 1 Separate the air outside the storage and the air outside the second storage. The first composition control unit (40) of the present embodiment is, similar to the first composition control unit (40) of the first embodiment, in the oxygen concentration reduction operation and the carbon dioxide concentration reduction operation of the in-compartment air control device (30). In each of them, an operation is performed to separate untreated outside air into first outside air and second outside air.

Further, the first composition adjusting unit (40) of the present embodiment performs an outside air introducing operation described later. The outside air introducing operation is an operation of supplying the outside air sucked from the outside of the transportation container (1) as it is into the inside of the transportation container (1). The first composition adjusting unit (40) of the present embodiment performs the outside air introducing operation in the oxygen concentration increasing operation. Also, in the evaluation operation performed by the airtightness evaluation unit (116) of the controller (110), the first composition adjustment unit (40) of the present embodiment performs the outside air introduction operation as necessary.

<First action>
As shown in FIG. 20, in the first operation, the first direction control valve (232) is set to the first state, and the second direction control valve (233) is set to the second state. As a result, the discharge port of the first pump mechanism (231a) is connected to the first suction cylinder (234), and the second suction cylinder (235) is connected to the suction port of the second pump mechanism (231b). In the first operation, the supply side on-off valve (273) is opened and the remaining on-off valves (251, 256, 272, 282) are closed. Then, in the first operation, an adsorption operation for the first adsorption cylinder (234) and a detachment operation for the second adsorption cylinder (235) are performed.

The first pump mechanism (231a) sucks in and evacuates untreated outside air from the outer trachea (241), and supplies the pressurized outside air to the first adsorption cylinder (234). In the first adsorption column (234), nitrogen contained in the supplied outside air outside the storage is adsorbed by the adsorbent. As a result, in the first adsorption column (234), the second outside air having a lower nitrogen concentration and a higher oxygen concentration than the untreated outside air is generated. The second outside air flows out of the first adsorption column (234), flows through the oxygen discharge pipe (245), and is discharged to the outside space as discharge air.

On the other hand, the second pump mechanism (231b) sucks air from the second adsorption cylinder (235). In the second adsorption column (235), the pressure inside thereof decreases and nitrogen is desorbed from the adsorbent. As a result, in the second adsorption column (235), the first outside air having a nitrogen concentration higher than that of the untreated outside air and a lower oxygen concentration is generated. The first outside air flows from the first adsorption cylinder (234) into the suction pipe (243) and is sucked into the second pump mechanism (231b). The second pump mechanism (231b) pressurizes the sucked first outside air and discharges it to the supply connection pipe (244). The first outside air flows through the supply connection pipe (244) as supply air, and is supplied to the inside space after merging with the air flowing through the supply pipe (120).

<2nd operation>
As shown in FIG. 21, in the second operation, the first direction control valve (232) is set to the second state, and the second direction control valve (233) is set to the first state. As a result, the discharge port of the first pump mechanism (231a) is connected to the second suction cylinder (235), and the first suction cylinder (234) is connected to the suction port of the second pump mechanism (231b). In the second operation, the supply side on-off valve (273) is opened and the remaining on-off valves (251, 256, 272, 282) are closed. Then, in the second operation, the detachment operation for the first adsorption cylinder (234) and the adsorption operation for the second adsorption cylinder (235) are performed.

The first pump mechanism (231a) sucks in and pressurizes untreated outside air from the outer trachea (241), and supplies the pressurized outside air to the second adsorption cylinder (235). In the second adsorption column (235), nitrogen contained in the supplied outside air outside the storage is adsorbed by the adsorbent. As a result, in the second adsorption column (235), the second outside air having a lower nitrogen concentration and a higher oxygen concentration than the untreated outside air is generated. The second outside air flows out of the second adsorption column (235), flows through the oxygen discharge pipe (245), and is discharged to the outside space as discharge air.

On the other hand, the second pump mechanism (231b) sucks air from the first adsorption column (234). In the first adsorption column (234), the pressure inside thereof decreases and nitrogen is desorbed from the adsorbent. As a result, in the first adsorption column (234), the first outside air having a nitrogen concentration higher than that of the untreated outside air and a lower oxygen concentration is generated. The first outside air flows from the first adsorption cylinder (234) into the suction pipe (243) and is sucked into the second pump mechanism (231b). The second pump mechanism (231b) pressurizes the sucked first outside air and discharges it to the supply connection pipe (244). The first outside air flows through the supply connection pipe (244) as supply air, and is supplied to the inside space after merging with the air flowing through the supply pipe (120).

<External air introduction operation>
As shown in FIG. 22, in the outside air introducing operation, the controller (110) indicates each of the first direction control valve (232) and the second direction control valve (233) in the second state (solid line in FIG. 22) And the motor (231c) of the air pump (231) is energized to operate the first pump mechanism (231a). Further, the controller (110) sets the first bypass valve (256), the exhaust on-off valve (272), the supply side on-off valve (273), and the purge valve (251) to the open state, and the measurement on-off valve. (282) and the measurement on / off valve (126) of the second composition adjustment unit (60) are set in the closed state. The second composition control unit (60) pauses.

In this outside air supply operation, the outside air discharged from the first pump mechanism (231a) is transported through the first bypass pipe (255), the supply connection pipe (244) and the supply pipe (120) in this order. Flows into the storage space of the container (1). Thus, in the outside air supply operation, the outside air sucked into the first pump mechanism (231a) from the outside of the transport container (1) is supplied as it is to the inside space of the transport container (1).

-Evaluation operation of air tightness evaluation unit-
In the evaluation operation, the airtightness evaluation unit (116) of the present embodiment adjusts the air pressure in the transport container (1) by causing the in-compartment air conditioning device (30) to perform the outside air introduction. Specifically, the airtightness evaluation unit (116) activates the first pump mechanism (231a) of the air pump (231) in the step corresponding to step ST12 of FIG. Then, the airtightness evaluation unit (116) raises the air pressure in the transport container (1) by supplying the outside air to the interior space of the transport container (1).

<< Other Embodiments >>
The following modification may be applied to the in-compartment air conditioning device (30) of each of the above embodiments.

-First modification-
The airtightness evaluation unit (116) of the airtightness evaluation device (130) of each of the above embodiments is based on the rate of change of the air pressure in the transport container (1) during operation of the pump unit (35) in its evaluation operation. It may be configured to evaluate the airtightness of the shipping container (1).

The airtightness evaluation unit (116) of the present modification is configured such that the container for transport (the case where the rate of increase in air pressure in the container for transport (1) during operation of the pump unit (35) is equal to or higher It is judged that the airtightness of 1) is satisfied. In addition, the airtightness evaluation unit (116) of this modification is used for transportation when the rate of increase in air pressure in the transportation container (1) during operation of the pump unit (35) is lower than a predetermined reference speed. Judge that the airtightness of the container (1) is insufficient.

-Second modification-
The airtightness evaluation device (130) of each of the above embodiments discharges air from the internal space of the transport container (1), and makes the air pressure in the transport container (1) negative pressure, whereby the transport container ( It may be configured to evaluate the airtightness of 1). In the airtightness evaluation device (130) of the present modification, a pump or a fan for discharging air from the internal space of the transport container (1) is provided as an air pressure adjustment device (131).

When air is exhausted from the internal space of the transport container (1), the air pressure in the transport container (1) gradually decreases. At that time, the lower the airtightness of the transport container (1), the slower the rate of decrease of the air pressure in the transport container (1). In addition, after the exhaust from the transport container (1) is stopped in a state where the atmospheric pressure in the transport container (1) is a negative pressure, the atmospheric pressure in the transport container (1) gradually increases. At that time, the lower the air tightness of the transport container (1), the faster the rise speed of the air pressure in the transport container (1). The airtightness evaluation device (130) of this modification evaluates the airtightness of the transport container (1) using such a phenomenon.

-Third modification-
In the airtightness evaluation device (130) of the third and fourth embodiments, the airtightness evaluation unit (116) is the external air that is discharged from the first pump (36) and supplied to the inside of the transport container (1). Even if the adjustment of the flow rate (the charge air flow rate) is performed not by the adjustment of the opening degree of the first control valve (46), but by the adjustment of the rotational speed of the drive motor (38) of the pump unit (35) Good. In this modification, the alternating current output from the inverter is supplied to the drive motor (38) of the pump unit (35). When the output frequency of the inverter is changed, the rotational speed of the drive motor (38) changes, and the flow rate of the air discharged from the first pump (36) changes.

-Fourth modification-
In the airtightness evaluation device (130) of each of the above embodiments, the airtightness evaluation unit (116) is not limited to the reference level (the airtightness level of the storage case (1)) but a plurality of different physical quantities to be determined. One of the evaluation conditions of may be configured to be selected by the worker. For example, the airtightness evaluation unit (116) of the present modification includes three evaluation conditions A to C selectable in the airtightness evaluation unit (116) of the third embodiment, and the airtightness evaluation unit (116) of the fourth embodiment. The operator may be configured to select one of three evaluation conditions A to C (that is, six evaluation conditions) selectable at.

-Fifth modification-
In the in-compartment air conditioner (30) according to the first to eighth embodiments, each of the first composition control unit (40) and the second composition control unit (60) is sucked by a so-called PSA (Pressure Swing Adsorption) method. The air may be configured to be separated into two types of air having different compositions. In this case, the composition adjusting unit (40, 60) adsorbs nitrogen contained in the sucked air to the adsorbent to generate air having a low nitrogen concentration and a high oxygen concentration and carbon dioxide concentration; And desorbing nitrogen from the agent to generate air having a high nitrogen concentration and a low oxygen concentration and a low carbon dioxide concentration.

-Sixth modification-
The refrigerator (10) provided with the in-compartment air conditioning device (30) of each of the above embodiments may be provided in a stationary refrigerator or freezer. Moreover, the refrigerator (10) provided with the in-compartment air conditioning apparatus (30) of each said embodiment may be provided in the refrigeration and refrigeration container for land transportation transported by a truck, a railway, etc. Moreover, the refrigerator (10) provided with the in-compartment air conditioning apparatus (30) of each said embodiment may be provided in the refrigeration / refrigeration truck with which the box which forms a cargo compartment was united with the chassis. .

As described above, the present invention is useful for an airtightness evaluation device for evaluating the airtightness of a storage case, and an in-compartment air conditioning device and a refrigeration system provided with the airtightness evaluation device.

1 Container for transportation (storage)
10 Refrigerator for container (freezer)
11 Refrigerant circuit 36 1st pump (air pump)
40 1st composition adjustment part 45 1st pressure sensor (air pressure sensor)
60 second composition adjustment unit 65 second pressure sensor (air pressure sensor)
103 3rd pressure sensor (air pressure sensor)
113 Operation panel (input section)
116 Airtightness evaluation unit 130 Airtightness evaluation device 131 Barometric pressure regulator

Claims

An air pressure regulator (131) for supplying air to the storage case (1) or exhausting air from the storage case (1) in order to make the air pressure in the storage case (1) different from the atmospheric pressure;
A barometric pressure sensor (103, 65, 45) for measuring the barometric pressure in the storage (1);
An evaluation operation is performed to evaluate the airtightness of the storage case (1) based on the measurement values of the air pressure sensor (103, 65, 45) during or after operation of the air pressure adjustment device (131). And an evaluation unit (116).
In claim 1,
The evaluation unit (116)
An operation of judging success or failure of an evaluation condition indicating that the airtightness of the storage (1) has reached a reference level based on the measurement values of the air pressure sensor (103, 65, 45) is the evaluation operation. An airtightness evaluation device characterized in that it is configured to perform.
In claim 2,
While the evaluation unit (116) is configured to determine success or failure of one of the plurality of evaluation conditions different from each other in the reference level in the evaluation operation,
An airtightness evaluation device comprising: an input unit (113) through which a worker inputs information for specifying one of the plurality of evaluation conditions among the plurality of evaluation conditions for which success or failure is determined in the evaluation operation.
In any one of claims 1 to 3,
The evaluation unit (116) operates the air pressure adjustment device (131) as the evaluation operation, and when the measurement value of the air pressure sensor (103, 65, 45) reaches the reference pressure, the air pressure adjustment device (131) So that the air tightness of the storage case (1) is evaluated based on the change in the measured value of the air pressure sensor (103, 65, 45) after the air pressure adjustment device (131) is stopped. An airtightness evaluation device characterized in that it is configured.
In any one of claims 1 to 3,
As the evaluation operation, the evaluation unit (116) keeps the measurement value of the air pressure sensor (103, 65, 45) in a predetermined pressure range for a predetermined time by controlling the air pressure adjustment device (131). After that, it is configured to perform an operation of evaluating the airtightness of the storage case (1) based on the change of the measurement value of the air pressure sensor (103, 65, 45) while the air pressure adjustment device (131) is stopped. Airtightness evaluation device characterized in that.
In any one of claims 1 to 3,
The evaluation unit (116) operates the air pressure adjustment device (131) as the evaluation operation, and changes in measured values of the air pressure sensor (103, 65, 45) during operation of the air pressure adjustment device (131). An airtightness evaluation device characterized by performing operation which evaluates airtightness of said storage (1) based on a.
The airtightness evaluation device (130) according to any one of claims 1 to 6,
An air pump (36) for pressurizing and discharging the outside air sucked from the outside of the storage case (1);
A separator (41) for separating supply air having a different composition from the outside air discharged from the outside air discharged by the air pump (36), and supplying the air for supply into the inside of the storage case (1) And),
The air pump (36) is configured to supply air to the storage (1) in order to make the pressure of the storage (1) positive, and the pressure adjustment device of the airtightness evaluation device (130) An internal air conditioner characterized in that it also serves as (131).
The airtightness evaluation device (130) according to any one of claims 1 to 6,
A composition adjustment unit (40, 60) for adjusting the composition of the air in the storage (1) to a target composition different from the composition of the atmosphere;
The evaluation unit (116) of the air tightness evaluation device (130) can not cause the composition of the air inside the storage (1) to reach the target composition by the operation of the composition adjustment unit (40, 60) An internal air conditioning system configured to perform the evaluation operation when a failure condition indicating that the condition is satisfied is established.
The airtightness evaluation device (130) according to any one of claims 1 to 6,
And a refrigerant circuit (11) for performing a refrigeration cycle to cool the air in the storage with a refrigerant so that the temperature of the air in the storage (1) becomes a target temperature,
The evaluation unit (116) of the air tightness evaluation device (130) has a problem that the temperature of the air inside the storage (1) can not reach the target temperature by the operation of the refrigerant circuit (11) A refrigeration apparatus characterized in that the evaluation operation is performed when a condition is satisfied.