JP2017125671A - Gas supply device and refrigeration device for container including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas supply device enabling improvement of adsorbing performance of an adsorbent.SOLUTION: A gas supply device 30 includes: first and second adsorption cylinders 34, 35; and an air pump 31 having a first pump mechanism 31a for pressurizing the first and second adsorption cylinders 34, 35 and a second pump mechanism 31b for depressurizing the cylinders. In the first and second adsorption cylinders 34, 35, an adsorbing operation for adsorbing a nitrogen component in pressurized air to an adsorbent and a desorption operation for desorbing the nitrogen component adsorbed to the adsorbent in the air are alternately performed so as to generate nitrogen concentrated air with an intended composition and supply the air into a chamber of a container. A cooler 90 for cooling the pressurized air by exchanging heat between the pressurized air flowing therein and outside air is provided in a pressurization passage 42 connecting the first pump mechanism 31a with the first and second adsorption cylinders 34, 35.SELECTED DRAWING: Figure 4

Description

    The present invention relates to a gas supply device that supplies a regulated gas having a predetermined composition into a container, and a container refrigeration device including the gas supply device.

    Conventionally, a container refrigeration apparatus including a refrigerant circuit that performs a refrigeration cycle is used to cool the air in a container of a container used for marine transportation or the like (see, for example, Patent Document 1). For example, plants such as bananas and avocados are loaded in the container, but the plants breathe to take in oxygen in the air and release carbon dioxide even after harvesting. When a plant breathes, the nutrients and moisture stored in the plant are reduced and the freshness is lowered. For this reason, it is preferable that the oxygen concentration in the storage of the storage is as low as possible so that respiratory disorder does not occur.

    Therefore, the container refrigeration apparatus of Patent Document 1 uses an adsorbent that adsorbs nitrogen components in the air when pressurized to generate nitrogen-enriched air having a higher nitrogen concentration than that of air and a lower oxygen concentration. A gas supply device is provided that reduces the respiration rate of the plant by reducing the oxygen concentration of the air in the warehouse by supplying the concentrated air into the container. In Patent Literature 1, by supplying nitrogen-enriched air into the container of the container by the gas supply device in this way, the oxygen concentration of the air in the warehouse is reduced to reduce the respiration rate of the plant and maintain the freshness of the plant. It is easy.

Japanese Patent Laying-Open No. 2015-072103

    Incidentally, the amount of adsorbate adsorbed in the adsorbent as described above decreases as the temperature of the adsorbent increases. However, in the gas supply device, since the outside air pressurized by an air pump and having a significantly increased temperature is sent directly to the adsorption cylinder, the adsorption performance of the adsorbent is not high and the adsorbent cannot be used efficiently.

    This invention is made | formed in view of this point, The objective is to aim at the improvement of the adsorption | suction performance in adsorption agent in the gas supply apparatus provided with the air pump and the adsorption cylinder.

    The first invention includes an adsorption cylinder (34, 35) provided in the storage (11) and containing an adsorbent that adsorbs a predetermined component in the air, and the adsorption cylinder (34, 35). Adsorption that pressurizes the adsorption cylinder (34, 35) by supplying pressurized air and adsorbs the predetermined component in the pressurized air to the adsorbent in the adsorption cylinder (34, 35) A pressure unit (31a) for performing the operation and the suction cylinder (34, 35) are depressurized by sucking air from the inside of the suction cylinder (34, 35), and the suction cylinder (34, 35) An air pump (31) having a pressure reducing part (31b) for performing a desorption operation for desorbing the predetermined component adsorbed on the adsorbent in the air, and performing the adsorption operation on the adsorption cylinder (34, 35). A gas supply device that alternately performs the desorption operation and generates a regulated gas having a desired composition and supplies the adjusted gas into the storage (11). The pressurizing passage (42) connecting the pressurizing section (31a) and the adsorption cylinder (34, 35) is provided to exchange heat between the pressurized air flowing inside and the outside air. A cooler (90) for cooling is provided.

    In the first invention, the adjustment gas is generated by alternately performing the adsorption operation and the desorption operation in the adsorption cylinders (34, 35), and the adjustment gas is stored in the storage chamber (11) by supplying it. The composition of the air in the storage (11) is adjusted.

    Here, in the first invention, the pressurized passage (42) connecting the pressurizing section (31a) and the adsorption cylinder (34, 35) is subjected to heat exchange between the pressurized air flowing inside and the outside air. A cooler (90) for cooling the pressurized air is provided. For this reason, the pressurized cylinder (34, 35) is supplied with pressurized air that has been pressurized by the pressurizing section (31a) of the air pump (31) and then radiated and cooled to the outside air.

    A second invention includes a unit case (36) that accommodates the adsorption cylinder (34, 35) and the air pump (31) in the first invention, and the cooler (90) includes the unit It is arranged outside the case (36).

    In the second invention, the adsorption cylinder (34, 35) and the air pump (31) are accommodated in the unit case (36). In such a configuration, during operation of the air pump (31), the air temperature inside the unit case (36) rises remarkably due to heat generated by the air pump (31). However, in the second invention, since the cooler (90) provided in the pressurizing passage (42) is disposed outside the unit case (36), the air temperature inside the unit case (36) is increased. Regardless, the pressurized air is cooled by the air outside the unit case (36).

    In a third aspect based on the second aspect, the storage (11) is a refrigerated storage that is cooled so that the temperature of the internal air is lower than the outside air, and the unit case (36) The cooler (90) is disposed outside the storage (11), and the cooler (90) is disposed within the storage (11).

    In the third invention, the unit case (36) is disposed outside the storage (11), while the cooler (90) is refrigerated storage that is cooled so that the temperature of the internal air is lower than the outside air. It is placed in the warehouse. For this reason, the suction cylinders (34, 35) are pressurized in the pressurizing part of the air pump (31) and then cooled in the cooler (90) by exchanging heat with the indoor air at a temperature lower than the outside air. Compressed air is supplied.

    According to a fourth invention, in the third invention, the pressurized passage (42) is provided downstream of the cooler (90), and a part of the pressurized air is condensed in the cooler (90). A gas-liquid separator (92) that separates and captures the generated condensed water from the pressurized air is provided.

    By the way, as described above, when the compressed air is cooled with the air in the refrigerator compartment lower than the outside air in the cooler (90), the temperature of the pressurized air decreases to the dew point temperature, Some of the contained water may condense to produce condensed water. When the condensed water is supplied to the adsorption cylinder (34, 35) together with the pressurized air, the condensed water may adhere to the adsorbent and the adsorption performance may be significantly reduced.

    Therefore, in the fourth invention, the gas-liquid separator (92) is provided on the downstream side of the cooler (90) in the pressurizing passage (42). Therefore, when condensed water is generated by condensing part of the pressurized air in the cooler (90), the condensed water is separated from the pressurized air and captured in the gas-liquid separator (92), and only the pressurized air is collected. Is supplied to the suction cylinders (34, 35) (34, 35).

    According to a fifth invention, in the fourth invention, a drainage passage (93) connected to the gas-liquid separator (92) for discharging condensed water in the gas-liquid separator (92) to the outside, and the drainage An on-off valve (94) provided in the passage (93) for opening and closing the drainage passage (93), and when the operation of the air pump (31) is stopped, the on-off valve (94) is opened to open the gas-liquid separator (92) It is comprised so that the drainage operation | movement which discharges | emits the condensed water outside may be performed.

    In the fifth invention, when the operation of the air pump (31) is stopped, a draining operation for discharging condensed water from the gas-liquid separator (92) to the outside is performed.

    A sixth invention is the invention according to any one of the first to fifth inventions, wherein the pressurizing passage (42) is constituted by a resin tube, and the cooler (90) is connected to a midway part of the tube. It is comprised by the made copper pipe.

    In 6th invention, the cooler (90) is comprised by the copper pipe connected to the middle part of the pressurization channel | path (42) comprised by the resin-made tubes.

    The seventh invention comprises a refrigerant circuit (20) that is attached to a container (11) in which plants for respiration are stored, performs a refrigeration cycle to cool the air in the container (11), and has a predetermined composition. A container for adjusting the temperature and composition of the air inside the container (11) to a desired state, comprising a gas supply device (30) that generates a regulated gas and supplies it into the container (11). The gas supply device (30) according to any one of the first to sixth aspects of the invention, wherein the gas supply device (30) supplies the adjustment gas into the storage using the container (11) as the storage (11). It is comprised by the gas supply apparatus (30) which concerns.

    In the seventh aspect of the invention, the refrigeration cycle is performed in the refrigerant circuit (20), whereby the internal air of the container (11) is cooled. Moreover, the composition of the internal air of the container (11) is adjusted by supplying the adjusted gas generated in the gas supply device (30) to the container (11).

    In the seventh aspect of the invention, in the gas supply device (30), the pressure passage (42) that connects the pressurization part (31a) of the air pump (31) and the adsorption cylinder (34, 35) is added to the inside. A cooler (90) that cools the pressurized air by exchanging heat between the compressed air and external air is provided. For this reason, the pressurized cylinder (34, 35) is supplied with pressurized air that has been pressurized by the pressurizing section (31a) of the air pump (31) and then radiated and cooled to the outside air.

    In an eighth aspect based on the seventh aspect, the internal storage space (S2) connected to the inside of the container (11) and the external storage connected to the outside of the container (11). A casing (12) that forms a space (S1), and the external storage space (S1) includes a condenser (22) connected to the refrigerant circuit (20), and a condenser (22). An outside fan (25) for guiding outside air and the gas supply device (30) are provided, and the cooler (90) is provided by the outside fan (25) in the outside storage space (S1). It arrange | positions upstream from the said condenser (22) of the flow of the external air formed.

    In the eighth aspect of the invention, the cooler (90) that cools the pressurized air supplied to the adsorption cylinder (34, 35) in the gas supply device (30) includes the outside fan (25 ) Is arranged on the upstream side of the condenser (22) of the flow of outside air formed by the With such an arrangement, outside air is forcibly supplied to the cooler (90) during operation of the outside fan (25). Further, since the outside air supplied to the cooler (90) is outside air having a relatively low temperature before being heated by the refrigerant in the refrigerant circuit (20) in the condenser (22), the cooler (90) In 90), the pressurized air is sufficiently cooled.

    According to the first invention, the cooler (90) is provided in the pressurizing passage (42) connecting the pressurizing section (31a) and the adsorption cylinder (34, 35), and the pressurized air is cooled by external air. After that, it was decided to supply to the adsorption cylinder (34, 35). Therefore, the temperature of the pressurized air supplied to the adsorption cylinder (34, 35) is lower than that in the case where the cooler (90) is not provided. Thereby, it becomes easy to adsorb | suck the predetermined component in pressurized air to adsorption agent in adsorption operation. Therefore, in the gas supply device (30) including the air pump (31) and the adsorption cylinder (34, 35), the adsorption performance of the adsorbent can be improved.

    According to the second aspect of the present invention, the pressure passage (42) connecting the pressure portion (31a) of the air pump (31) housed in the unit case (36) and the suction cylinder (34, 35) is provided. The provided cooler (90) was arranged outside the unit case (36). Therefore, the adsorption cylinder (34, 35) and the air pump (31) are accommodated inside the unit case (36), and the air temperature inside the unit case (36) rises significantly during the operation of the air pump (31). Even in such an environment, the pressurized air can be reliably cooled by the air outside the unit case (36) in the cooler (90).

    According to the third aspect of the invention, the cooler (90) is disposed in the refrigerator compartment, and the compressed air is cooled by the cooler air in the cooler (90) lower than the outside air before being adsorbed. It was decided to supply to the tube (34, 35). Therefore, the temperature of the pressurized air supplied to the adsorption cylinder (34, 35) is lower than when the cooler (90) is provided outside the refrigerator storage. Thereby, it becomes easy to adsorb | suck the predetermined component in pressurized air by adsorption agent in adsorption operation. Therefore, in the gas supply device (30) including the air pump (31) and the adsorption cylinder (34, 35), the adsorption performance of the adsorbent can be further improved.

    According to the fourth aspect of the invention, the gas-liquid separator (92) is provided on the downstream side of the cooler (90) of the pressurizing passage (42), and a part of the pressurized air is outside air in the cooler (90). Even when it is cooled and condensed by cooler internal air, the condensed liquid is separated from the pressurized air and captured by the gas-liquid separator (92), so that only the pressurized air is absorbed ( 34, 35). Therefore, while preventing the condensed water from adhering to the adsorbent and significantly reducing the adsorbent performance, the adsorbent is supplied by supplying pressurized air cooled to the dew point temperature to the adsorption cylinder (34, 35). The adsorption performance can be improved to the maximum.

    By the way, the gas-liquid separator (92) is provided in the pressurized passage (42) through which the pressurized air pressurized by the air pump (31) flows. Therefore, if the open / close valve (94) of the drainage passage (93) is opened during the operation of the air pump (31), the inside of the gas-liquid separator (92) communicates with the outside, and the inside of the gas-liquid separator (92) There is a possibility that the pressurized air passing therethrough is discharged to the outside together with the condensed water through the drainage passage (93).

    Therefore, in the fifth invention, the on-off valve (94) is opened when the operation of the air pump (31) where pressurized air is not supplied to the gas-liquid separator (92) is stopped. In this way, pressurized air passing through the gas-liquid separator (92) is supplied to the adsorption cylinder by opening the on-off valve (94) with the pressure inside and outside the gas-liquid separator (92) being almost equal. Without being discharged together with the condensed water through the drainage passage (93), it can be prevented.

    According to the sixth aspect of the invention, the cooler (90) is constituted by a copper pipe and is connected to the midway part of the pressurizing passage (42) constituted by a resin tube. Therefore, the cooler (90) can be easily configured simply by connecting a copper tube to the middle portion of the resin tube.

    According to the seventh aspect of the invention, the cooler (90) is provided in the pressurizing passage (42) connecting the pressurizing section (31a) and the adsorption cylinder (34, 35) in the gas supply device (30). A gas supply device (30) for supplying the compressed air to the adsorption cylinder (34, 35) after cooling with external air is provided. Thereby, in the container refrigeration apparatus (10) including the gas supply device (30) having the air pump (31) and the adsorption cylinder (34, 35), the adsorption performance in the adsorbent can be improved, and the container It is possible to efficiently adjust the composition of the internal air in (11).

    According to the eighth aspect of the invention, the cooler (90) for cooling the pressurized air supplied to the adsorption cylinder (34, 35) in the gas supply device (30) is stored in the storage space outside the store (S1). It was decided to arrange it on the upstream side of the condenser (22) of the flow of outside air formed by the outer fan (25). With this arrangement, the outside air is forcibly supplied to the cooler (90) while the outside fan (25) is in operation, so that the pressurized air can be sufficiently cooled. Further, since the outside air having a relatively low temperature before being heated by the refrigerant in the refrigerant circuit (20) in the condenser (22) is supplied to the cooler (90), this also causes the cooler ( In 90), the pressurized air can be sufficiently cooled. Therefore, in the container refrigeration apparatus (10) provided with the gas supply apparatus (30), the adsorption performance of the adsorbent can be further improved, and the composition of the air in the container (11) is efficiently adjusted. be able to.

FIG. 1 is a perspective view of the container refrigeration apparatus as viewed from the outside of the warehouse. FIG. 2 is a side sectional view showing a schematic configuration of the container refrigeration apparatus of the embodiment. FIG. 3 is a piping diagram illustrating the configuration of the refrigerant circuit of the container refrigeration apparatus according to the embodiment.

FIG. 4 is a piping system diagram showing the configuration of the CA device of the container refrigeration apparatus, and shows the flow of air during the first operation. FIG. 5 is a piping system diagram showing the configuration of the CA device of the container refrigeration apparatus, and shows the air flow during the second operation. FIG. 6 is a piping system diagram showing the configuration of the CA apparatus of the container refrigeration apparatus, and shows the flow of air during the pressure equalizing operation. FIG. 7 is a schematic diagram illustrating a schematic configuration of a gas-liquid separator of the container refrigeration apparatus according to the embodiment. FIG. 8 is a side sectional view showing a schematic configuration of a container refrigeration apparatus according to another embodiment in which a cooler is provided outside the refrigerator. FIG. 9 is a piping system diagram showing a configuration of a CA apparatus of a container refrigeration apparatus according to another embodiment in which a cooler is provided outside the container, and shows a flow of air during the first operation.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

<< Embodiment of the Present Invention >>
As shown in FIGS. 1 and 2, the container refrigeration apparatus (10) is provided in a container (storage) (11) used for marine transportation and the like, and cools the air in the container (11). It is. In the container (11), the plants (15) are stored in a boxed state. The plant (15) breathes by taking in oxygen (O ₂ ) in the air and releasing carbon dioxide (CO ₂ ). For example, fruits and vegetables such as banana and avocado, vegetables, grains, bulbs, fresh flowers, etc. It is.

    The container (11) is formed in an elongated box shape with one end face opened. The container refrigeration apparatus (10) includes a casing (12), a refrigerant circuit (20), and a CA apparatus (Controlled Atmosphere System) (60). The container (11) has an open end. It is attached to close.

<casing>
As shown in FIG. 2, the casing (12) includes a warehouse outer wall (12a) located on the outside of the container (11) and a cabinet inner wall (12b) located on the inside of the container (11). . The outer wall (12a) and the inner wall (12b) are made of, for example, an aluminum alloy.

    The outer wall (12a) is attached to the peripheral edge of the opening of the container (11) so as to close the opening end of the container (11). The warehouse outer wall (12a) is formed so that the lower part bulges to the inside of the container (11).

    The inner wall (12b) is disposed to face the outer wall (12a). The inner wall (12b) bulges to the inner side corresponding to the lower part of the outer wall (12a). A heat insulating material (12c) is provided in the space between the inner wall (12b) and the outer wall (12a).

    Thus, the lower part of the casing (12) is formed so as to bulge out toward the inner side of the container (11). As a result, an outside storage space (S1) is formed outside the container (11) at the lower part of the casing (12), and an inside storage space is provided inside the container (11) at the upper part of the casing (12). (S2) is formed.

    As shown in FIG. 1, two service openings (14) for maintenance are formed side by side in the width direction in the casing (12). The two service openings (14) are closed by first and second service doors (16A, 16B) that can be opened and closed, respectively. Each of the first and second service doors (16A, 16B) is constituted by a warehouse outer wall, a warehouse inner wall, and a heat insulating material, like the casing (12).

    As shown in FIG. 2, the partition plate (18) is arrange | positioned in the store | warehouse | chamber of a container (11). This partition plate (18) is comprised by the substantially rectangular-shaped board member, and is standingly arranged in the attitude | position facing the inner surface of the container (11) of a casing (12). The partition plate (18) divides the interior of the container (11) from the interior storage space (S2).

    A suction port (18a) is formed between the upper end of the partition plate (18) and the ceiling surface in the container (11). The internal air of the container (11) is taken into the internal storage space (S2) through the suction port (18a).

    The storage space (S2) is provided with a partition wall (13) extending in the horizontal direction. The partition wall (13) is attached to an upper end portion of the partition plate (18), and an opening in which a later-described internal fan (26) is installed is formed. The partition wall (13) includes an internal storage space (S2), a primary space (S21) on the suction side of the internal fan (26), and a secondary space (S22) on the outlet side of the internal fan (26). Divide into and. In this embodiment, the storage space (S2) is vertically divided by the partition wall (13), the primary space on the suction side (S21) is on the upper side, and the secondary space on the outlet side (S22) is on the lower side. Formed on the side.

    In the container (11), a floor board (19) is provided with a gap between the bottom surface of the container (11). A boxed plant (15) is placed on the floor board (19). An underfloor channel (19a) is formed between the bottom surface in the container (11) and the floor board (19). A gap is provided between the lower end of the partition plate (18) and the bottom surface in the container (11), and communicates with the underfloor channel (19a).

    On the back side of the container (11) in the floor board (19) (right side in FIG. 2) is formed an outlet (18b) that blows out the air cooled by the container refrigeration system (10) into the container (11). Has been.

<Configuration and arrangement of refrigerant circuit, etc.>
As shown in FIG. 3, the refrigerant circuit (20) includes a compressor (21), a condenser (22), an expansion valve (23), and an evaporator (24) in order by a refrigerant pipe (20a). It is a closed circuit configured by connecting.

    In the vicinity of the condenser (22), it is rotationally driven by an external fan motor (25a), attracting the air (outside air) in the external space of the container (11) into the external storage space (S1), and the condenser An outside fan (25) to be sent to (22) is provided. In the condenser (22), heat is generated between the refrigerant pressurized by the compressor (21) and flowing inside the condenser (22) and the outside air sent to the condenser (22) by the external fan (25). Exchange is performed. In the present embodiment, the external fan (25) is a propeller fan.

    In the vicinity of the evaporator (24), an internal fan that is rotationally driven by an internal fan motor (26a), draws the internal air of the container (11) from the suction port (18a), and blows it out to the evaporator (24) Two (26) are provided. In the evaporator (24), the pressure is reduced by the expansion valve (23) and flows between the refrigerant flowing in the evaporator (24) and the internal air sent to the evaporator (24) by the internal fan (26). Heat exchange takes place.

    As shown in FIG. 2, the internal fan (26) includes a propeller fan (rotary blade) (27a), a plurality of stationary blades (27b), and a fan housing (27c). The propeller fan (27a) is connected to the internal fan motor (26a), is driven to rotate around the rotation axis by the internal fan motor (26a), and blows air in the axial direction. The plurality of stationary blades (27b) are provided on the blowing side of the propeller fan (27a), and rectify the air flow blown and swirled from the propeller fan (27a). The fan housing (27c) is configured by a cylindrical member having a plurality of stationary blades (27b) attached to the inner peripheral surface, extends to the outer periphery of the propeller fan (27a), and surrounds the outer periphery of the propeller fan (27a).

    As shown in FIG. 1, the compressor (21) and the condenser (22) are stored in the external storage space (S1). The condenser (22) includes a lower first space (S11) and an upper second space (S12) at the central portion in the vertical direction of the external storage space (S1). It is provided to partition. The first space (S11) includes the compressor (21), an inverter box (29) containing a drive circuit for driving the compressor (21) at a variable speed, and a CA device (60). And a gas supply device (30). On the other hand, an external fan (25) and an electrical component box (17) are provided in the second space (S12). The first space (S11) is open to the outside space of the container (11), while the second space (S12) is such that only the outlet of the outside fan (25) opens into the outside space. The space between the outer space and the outside is closed by a plate-like member.

    On the other hand, as shown in FIG. 2, the evaporator (24) is stored in the secondary space (S22) of the internal storage space (S2). Two internal fans (26) are provided in the internal storage space (S2) above the evaporator (24) along the width direction of the casing (12) (see FIG. 1).

<CA equipment>
As shown in FIGS. 4 to 6, the CA device (60) includes a gas supply device (30), an exhaust unit (46), a sensor unit (50), and a control unit (55). 11) Adjusts the oxygen concentration and carbon dioxide concentration of the air in the cabinet. Note that “concentration” used in the following description refers to “volume concentration”.

[Gas supply device]
-Configuration of gas supply device-
The gas supply device (30) is a device that generates nitrogen-enriched air having a low oxygen concentration to be supplied into the container (11). In the present embodiment, the gas supply device (30) is configured by VPSA (Vacuum Pressure Swing Adsorption). Moreover, the gas supply apparatus (30) is arrange | positioned at the corner part of the lower left of the storage space outside a store | warehouse | chamber (S1), as shown in FIG.

    As shown in FIG. 4, the gas supply device (30) includes an air pump (31), a first directional control valve (32) and a second directional control valve (33), and adsorbs nitrogen components in the air. An air circuit (3) to which the first adsorption cylinder (34) and the second adsorption cylinder (35) provided with the adsorbent are connected, and a unit case (36) in which the components of the air circuit (3) are accommodated ), A cooler (90), and a drainage unit (91).

(air pump)
The air pump (31) is provided in the unit case (36), and sucks, pressurizes, and discharges air, respectively, a first pump mechanism (pressurizing unit) (31a) and a second pump mechanism (decompressing unit) (31b) )have. The first pump mechanism (31a) and the second pump mechanism (31b) are connected to the drive shaft of the motor (31c) and are driven to rotate by the motor (31c), thereby sucking and pressurizing air to discharge. To do.

    The suction port of the first pump mechanism (31a) is connected to one end of an outside air passage (41) provided so as to penetrate the unit case (36) in and out. A membrane filter (76) having air permeability and waterproofness is provided at the other end of the outside air passage (41). The outside air passage (41) is constituted by a flexible tube. Although not shown, the other end of the outside air passage (41) provided with the membrane filter (76) is provided in the second space (S12) above the condenser (22) in the outside storage space (S1). ing. With such a configuration, when the first pump mechanism (31a) flows into the unit case (36) from the outside through the membrane filter (76) provided at the other end of the outside air passage (41), Inhale and pressurize the outside air removed.

    On the other hand, one end of the pressurizing passage (42) is connected to the discharge port of the first pump mechanism (31a). The other end of the pressurizing passage (42) branches into two on the downstream side and is connected to the first directional control valve (32) and the second directional control valve (33), respectively. The pressurizing passage (42) is constituted by a resin tube, and a part thereof is provided outside the unit case (36). In the present embodiment, a part of the pressurizing passage (42) provided outside the unit case (36) passes through the casing (12) and is provided in the storage space (S2). As will be described in detail later, a cooler (90) is provided in a part of the pressurizing passage (42) provided in the storage space (S2), and is located downstream of the cooler (90). A drainage unit (91) is provided in a portion provided in the outer storage space (S1).

    One end of the decompression passage (43) is connected to the suction port of the second pump mechanism (31b). The other end of the decompression passage (43) is divided into two on the upstream side, and is connected to each of the first directional control valve (32) and the second directional control valve (33). On the other hand, one end of the supply passage (44) is connected to the discharge port of the second pump mechanism (31b). The other end of the supply passage (44) opens in the secondary space (S22) on the outlet side of the internal fan (26) in the internal storage space (S2) of the container (11). The other end of the supply passage (44) is provided with a check valve (65) that allows only air flow from one end to the other end and prevents backflow of air.

    In the present embodiment, the pressurizing passage (42) and the decompression passage (43) are connected by a bypass passage (47). The bypass passage (47) is provided with a bypass on-off valve (48) that is controlled to be opened and closed by the controller (55).

    The first pump mechanism (31a) and the second pump mechanism (31b) of the air pump (31) are oilless pumps that do not use lubricating oil. Two air blow fans (49) for cooling the air pump (31) by blowing air toward the air pump (31) are provided on the side of the air pump (31).

(Directional control valve)
The first directional control valve (32) and the second directional control valve (33) are provided between the air pump (31) and the first adsorption cylinder (34) and the second adsorption cylinder (35) in the air circuit (3). Thus, the connection state between the air pump (31) and the first suction cylinder (34) and the second suction cylinder (35) is switched to three connection states (first to third connection states) described later. This switching operation is controlled by the control unit (55).

    Specifically, the first directional control valve (32) was connected to the pressure passage (42) connected to the discharge port of the first pump mechanism (31a) and the suction port of the second pump mechanism (31b). The decompression passage (43) is connected to one end of the first adsorption cylinder (34) (inflow port during pressurization). The first direction control valve (32) communicates the first adsorption cylinder (34) with the discharge port of the first pump mechanism (31a) and shuts it from the suction port of the second pump mechanism (31b) ( 4) and a second state in which the first adsorption cylinder (34) communicates with the suction port of the second pump mechanism (31b) and is blocked from the discharge port of the first pump mechanism (31a) (see FIG. 5). To the state shown).

    The second direction control valve (33) includes a pressurizing passage (42) connected to the discharge port of the first pump mechanism (31a) and a decompression passage (43) connected to the suction port of the second pump mechanism (31b). ) And one end of the second adsorption cylinder (35). The second direction control valve (33) communicates the second adsorption cylinder (35) with the suction port of the second pump mechanism (31b) and shuts it from the discharge port of the first pump mechanism (31a) ( 4) and a second state in which the second adsorption cylinder (35) communicates with the discharge port of the first pump mechanism (31a) and is blocked from the suction port of the second pump mechanism (31b) (see FIG. 5). To the state shown).

    When both the first directional control valve (32) and the second directional control valve (33) are set to the first state, the air circuit (3) causes the discharge port of the first pump mechanism (31a) and the first adsorption cylinder (34). ) And the first connection state in which the suction port of the second pump mechanism (31b) and the second suction cylinder (35) are connected to each other (see FIG. 4). In this state, an adsorption operation for adsorbing the nitrogen component in the outside air to the adsorbent is performed in the first adsorption cylinder (34), and a desorption operation for desorbing the nitrogen component adsorbed to the adsorbent in the second adsorption cylinder (35). Is done.

    When both the first directional control valve (32) and the second directional control valve (33) are set to the second state, the air circuit (3) causes the discharge port of the first pump mechanism (31a) and the second adsorption cylinder (35). ) And the second connection state in which the suction port of the second pump mechanism (31b) and the first suction cylinder (34) are connected (see FIG. 5). In this state, the adsorption operation is performed by the second adsorption cylinder (35), and the desorption operation is performed by the first adsorption cylinder (34).

    When the first direction control valve (32) is set to the first state and the second direction control valve (33) is set to the second state, the air circuit (3) is connected to the discharge port of the first pump mechanism (31a). The first suction cylinder (34) is connected, and the third connection state in which the discharge port of the first pump mechanism (31a) and the second suction cylinder (35) are connected is switched (see FIG. 6). In this state, both the first adsorption cylinder (34) and the second adsorption cylinder (35) are connected to the discharge port of the first pump mechanism (31a), and the first adsorption cylinder (34) is connected by the first pump mechanism (31a). ) And the second adsorption cylinder (35) are supplied with pressurized outside air. In this state, the adsorption operation is performed in both the first adsorption cylinder (34) and the second adsorption cylinder (35).

(Adsorption cylinder)
The first adsorption cylinder (34) and the second adsorption cylinder (35) are constituted by cylindrical members filled with an adsorbent. The adsorbent filled in the first adsorption cylinder (34) and the second adsorption cylinder (35) has a property of adsorbing a nitrogen component under pressure and desorbing the adsorbed nitrogen component under reduced pressure.

    The adsorbent filled in the first adsorption cylinder (34) and the second adsorption cylinder (35) is, for example, smaller than the molecular diameter of nitrogen molecules (3.0 angstroms) and the molecular diameter of oxygen molecules (2.8 angstroms). ) And a porous zeolite having pores with a larger pore diameter than the above. If the adsorbent is composed of zeolite having such a pore size, nitrogen components in the air can be adsorbed.

    Further, since the electric field is present in the pores of the zeolite due to the presence of cations and the polarity is generated, the zeolite has a property of adsorbing polar molecules such as water molecules. Therefore, not only nitrogen in the air but also moisture (water vapor) in the air is adsorbed to the adsorbent made of zeolite filled in the first adsorption cylinder (34) and the second adsorption cylinder (35). The moisture adsorbed on the adsorbent is desorbed from the adsorbent together with the nitrogen component by the desorption operation. Therefore, nitrogen-concentrated air containing moisture is supplied into the container (11), and the humidity inside the container can be increased. Furthermore, since the adsorbent is regenerated, the life of the adsorbent can be extended.

    With such a configuration, when the outside air pressurized from the air pump (31) is supplied to the first adsorption cylinder (34) and the second adsorption cylinder (35) and the inside is pressurized, the outside air is supplied to the adsorbent. The nitrogen component in it is adsorbed. As a result, since the nitrogen component is less than the outside air, oxygen-enriched air having a lower nitrogen concentration and a higher oxygen concentration than the outside air is generated. On the other hand, in the first adsorption cylinder (34) and the second adsorption cylinder (35), when the internal air is sucked and reduced in pressure by the air pump (31), the nitrogen component adsorbed by the adsorbent is desorbed. As a result, nitrogen-concentrated air having a higher nitrogen concentration and lower oxygen concentration than the outside air is generated by containing more nitrogen components than the outside air. In this embodiment, for example, nitrogen-enriched air having a component ratio of 92% nitrogen concentration and 8% oxygen concentration is generated.

    The other end of the first adsorption cylinder (34) and the second adsorption cylinder (35) (the outlet at the time of pressurization) includes the first pump in the first adsorption cylinder (34) and the second adsorption cylinder (35). One end of an oxygen discharge passage (45) is connected to guide the oxygen-enriched air generated by supplying the outside air pressurized by the mechanism (31a) to the outside of the container (11). One end of the oxygen discharge passage (45) branches into two and is connected to each of the other end portions of the first adsorption cylinder (34) and the second adsorption cylinder (35). The other end of the oxygen discharge passage (45) is opened outside the gas supply device (30), that is, outside the container (11). A portion connected to the other end of the first adsorption cylinder (34) of the oxygen discharge passage (45) and a portion connected to the other end of the second adsorption cylinder (35) are connected to the oxygen discharge passage (45). A check valve (61) for preventing the backflow of air to the first adsorption cylinder (34) and the second adsorption cylinder (35) is provided.

    A check valve (62) and an orifice (63) are provided in order from one end to the other end in the middle of the oxygen discharge passage (45). The check valve (62) prevents backflow of nitrogen-enriched air from the exhaust connection passage (71), which will be described later, toward the first adsorption cylinder (34) and the second adsorption cylinder (35). The orifice (63) decompresses the oxygen-enriched air that has flowed out of the first adsorption cylinder (34) and the second adsorption cylinder (35) before being discharged out of the chamber.

(Supply / discharge switching mechanism)
The air circuit (3) has a supply for switching between a gas supply operation (described later) for supplying the generated nitrogen-concentrated air into the container (11) and a gas discharge operation for discharging the generated nitrogen-concentrated air to the outside. An exhaust switching mechanism (70) is provided. The supply / discharge switching mechanism (70) has an exhaust connection passage (71), an exhaust on-off valve (72), and a supply-side on-off valve (73).

    One end of the exhaust connection passage (71) is connected to the supply passage (44), and the other end is connected to the oxygen discharge passage (45). The other end of the exhaust connection passage (71) is connected to the outside of the warehouse from the orifice (63) of the oxygen discharge passage (45).

    The exhaust on-off valve (72) is provided in the exhaust connection passage (71). The exhaust opening / closing valve (72) is in the middle of the exhaust connection passage (71), and is closed to block the flow of nitrogen-enriched air and the open state that allows the flow of nitrogen-enriched air flowing in from the supply passage (44). It is comprised by the solenoid valve which switches to a state. The opening / closing operation of the exhaust opening / closing valve (72) is controlled by the control unit (55).

    The supply-side on-off valve (73) is provided on the other end side (inside the warehouse) of the connection portion to which the exhaust connection passage (71) is connected in the supply passage (44). The supply-side on-off valve (73) has an open state that allows the flow of nitrogen-enriched air to the inside of the supply passage (44) inside the connection portion of the exhaust connection passage (71), and nitrogen-concentrated air. It is comprised by the solenoid valve which switches to the closed state which interrupts | blocks the distribution | circulation to the inner side of a warehouse. The opening / closing operation of the supply side opening / closing valve (73) is controlled by the control unit (55).

(Measurement unit)
The air circuit (3) measures the concentration of the generated nitrogen-enriched air using an oxygen sensor (51) of a sensor unit (50), which will be described later, provided in the container (11). A measurement unit (80) is provided for performing the above. The measurement unit (80) includes a branch pipe (measurement passage) (81) and a measurement on-off valve (82). The oxygen sensor (51) ).

    Specifically, the branch pipe (81) has one end connected to the supply passage (44) and the other end connected to the oxygen sensor (51). In the present embodiment, the branch pipe (81) is provided so as to branch from the supply passage (44) in the unit case (36) and extend inside and outside the unit case. A check valve (64) is provided at the other end (inside of the branch) of the branch pipe (81) to allow only air flow from one end to the other end and prevent backflow of air. .

    The measurement on-off valve (82) is provided inside the unit case of the branch pipe (81). The on-off valve for measurement (82) is an electromagnetic valve that switches between an open state allowing the flow of nitrogen-enriched air in the branch pipe (81) and a closed state blocking the flow of the nitrogen-enriched air in the branch pipe (81). It is configured. The opening / closing operation of the measurement on-off valve (82) is controlled by the control unit (55). Although details will be described later, the measurement on-off valve (82) is opened only when an air supply measurement operation described later is executed, and is closed in other modes.

(Cooler and drainage unit)
As described above, the cooler (90) and the drainage unit (91) are provided in a part of the pressurizing passage (42) provided in the storage space (S2).

    In the present embodiment, the cooler (90) is a part of the pressure passage (42) made of a resin tube, and is constituted by a copper tube connected to a portion provided in the storage space (S2). Has been. With such a configuration, the pressurized air that is pressurized by the first pump mechanism (31a) and flows through the pressurizing passage (42) passes through the cooler (90) that is composed of a copper pipe, and the cooling is performed. It cools by radiating heat to the internal air of the temperature lower than the outside air of the internal storage space (S2) provided with the vessel (90). At this time, moisture in the pressurized air may condense.

    The drainage unit (91) is provided to remove condensed water in the pressurized air generated in the cooler (90). Therefore, the drainage unit (91) is provided on the downstream side of the cooler (90) in the pressurizing passage (42). The drainage unit (91) is provided in the external storage space (S1), and has a gas-liquid separator (92), a drainage passage (93), and a drainage valve (open / close valve) (94). Yes.

    As shown in FIG. 7, the gas-liquid separator (92) includes a tank (92a), a bulkhead joint (92b), a packing (92c), a holding member (92d), and two screwed joints (92e, 92f). ).

    The tank (92a) is composed of a cylindrical member similar to the first adsorption cylinder (34) and the second adsorption cylinder (35). The bulkhead joint (92b) is inserted into a hole formed in the lid member at the upper end of the tank (92a) so as to penetrate inside and outside of the tank (92a), and is pressurized to the outer end and the inner end, respectively. A resin tube constituting the passage (42) is connected. The packing (92c) is provided inside the lid member of the tank (92a) so that the pressurized air does not leak outside through the insertion hole of the bulkhead joint (92b) formed in the lid member of the tank (92a). Yes. The pressing member (92d) is constituted by, for example, a nut fixed to the lid member of the tank (92a), and presses the packing (92c) against the lid member of the tank (92a). Of the two threaded joints (92e, 92f), one threaded joint (92e) is screwed into a hole formed in the lid member of the tank (92a) to form a pressure passage (42). Is connected. On the other hand, the other threaded joint (92f) is screwed into a hole formed in the bottom member of the tank (92a), and the drainage passage (93) is connected thereto.

    With such a configuration, in the gas-liquid separator (92), pressurized air containing condensed water is pushed into the tank (92a) via the pressurized passage (42). In the tank (92a), condensed water accumulates at the bottom, and only the pressurized air is in the upper layer. The pressurized air in the upper layer is pushed out of the tank (92a) through the pressurized passage (42) fixed to the lid member of the tank (92a). As described above, the gas-liquid separator (92) is configured to capture the condensed water in the pressurized air and discharge only the pressurized air to the downstream side.

    The drainage passage (93) is constituted by a resin tube. One end of the drainage passage (93) is connected to a screw joint (92f) screwed into a hole formed in the bottom member of the tank (92a) described above, and the other end is opened outside the casing (12). (Not shown). Thus, the drainage passage (93) is configured to guide the condensed water separated from the pressurized air in the gas-liquid separator (92) and accumulated in the bottom of the tank (92a) to the outside of the casing (12). ing.

    The drain valve (94) is provided in the drain passage (93). The drain valve (94) shuts off the condensate flow from the open state that allows the condensate flowing into the drain passage (93) from the gas-liquid separator (92) in the middle of the drain passage (93). It is constituted by a solenoid valve that switches to a closed state. The opening / closing operation of the drain valve (94) is controlled by the control unit (55). Although details will be described later, the control unit (55) opens the drain valve (94) and stops the condensed water captured by the gas-liquid separator (92) when the operation of the air pump (31) is stopped. ) Is discharged to the outside of the casing (12).

-Operation of gas supply device-
(Gas generation operation)
In the gas supply device (30), the first operation (see FIG. 4) in which the first adsorption cylinder (34) is pressurized and the second adsorption cylinder (35) is depressurized at the same time, and the first adsorption cylinder (34) ) Is depressurized and the second operation (see FIG. 5) in which the second adsorption cylinder (35) is pressurized is repeated alternately for a predetermined time (for example, 14.5 seconds). Nitrogen-enriched air and oxygen-enriched air are generated. Further, in the present embodiment, a pressure equalizing operation (see FIG. 6) in which both the first adsorption cylinder (34) and the second adsorption cylinder (35) are pressurized between the first operation and the second operation. For a predetermined time (for example, 1.5 seconds). Switching of each operation | movement is performed when a control part (55) operates a 1st direction control valve (32) and a 2nd direction control valve (33).

<First operation>
In the first operation, the control unit (55) switches both the first directional control valve (32) and the second directional control valve (33) to the first state shown in FIG. Thus, the air circuit (3) is configured such that the first adsorption cylinder (34) communicates with the discharge port of the first pump mechanism (31a) and is blocked from the suction port of the second pump mechanism (31b), and the second adsorption The cylinder (35) communicates with the suction port of the second pump mechanism (31b) and enters the first connection state where the cylinder (35) is blocked from the discharge port of the first pump mechanism (31a). In this first connection state, outside air pressurized by the first pump mechanism (31a) is supplied to the first adsorption cylinder (34), while the second pump mechanism (31b) is supplied to the second adsorption cylinder (35). From the air, nitrogen-concentrated air having a higher nitrogen concentration than the outside air and a lower oxygen concentration than the outside air is sucked.

    Specifically, the first pump mechanism (31a) sucks and pressurizes the outside air via the outside air passage (41), and discharges the pressurized outside air (pressurized air) to the pressure passage (42). The pressurized air discharged into the pressurized passage (42) flows through the pressurized passage (42) and is located outside the unit case (36) and in the cooler (90) provided in the storage space (S2). Flow into. When the compressed air passes through the cooler (90), it is cooled by exchanging heat with the inside air having a temperature lower than that of the outside air.

    By the way, when the pressurized air is cooled by the internal air in the cooler (90) and the temperature is lowered to the dew point temperature, a part of the moisture contained in the pressurized air is condensed to produce condensed water. When pressurized air containing such condensed water is supplied to the adsorption cylinder, the condensed water may adhere to the adsorbent and the adsorption performance may be significantly reduced.

    However, in this embodiment, the drainage unit (91) is provided on the downstream side of the cooler (90). Therefore, the condensed water generated in the cooler (90) is captured in the tank (92a) of the gas-liquid separator (92), and only the dehydrated pressurized air is first adsorbed via the pressurized passage (42). It is supplied to the cylinder (34) (see FIG. 7).

    In this way, the cooled and dehydrated pressurized air flows into the first adsorption cylinder (34), and the nitrogen component contained in the pressurized air is adsorbed by the adsorbent. Note that the adsorption performance of the adsorbent improves as the temperature of the adsorbent decreases. Therefore, as described above, by preliminarily cooling the pressurized air in the cooler (90), the adsorption performance to the adsorbent is improved as compared with the case where it is not cooled. In this way, during the first operation, the first adsorption cylinder (34) is supplied with pressurized outside air from the first pump mechanism (31a), and the nitrogen component in the outside air is adsorbed by the adsorbent. As a result, oxygen-enriched air having a lower nitrogen concentration than the outside air and a higher oxygen concentration than the outside air is generated. The oxygen-enriched air flows out from the first adsorption cylinder (34) to the oxygen discharge passage (45).

    On the other hand, the second pump mechanism (31b) sucks air from the second adsorption cylinder (35). At that time, the nitrogen component adsorbed by the adsorbent of the second adsorption cylinder (35) is sucked together with air by the second pump mechanism (31b) and desorbed from the adsorbent. As described above, during the first operation, in the second adsorption cylinder (35), the internal air is sucked by the second pump mechanism (31b) and the nitrogen component adsorbed on the adsorbent is desorbed. Nitrogen-enriched air that contains the desorbed nitrogen component and has a higher nitrogen concentration than the outside air and a lower oxygen concentration than the outside air is generated. The nitrogen-enriched air is sucked into the second pump mechanism (31b), pressurized, and then discharged to the supply passage (44).

<< Second operation >>
In the second operation, both the first directional control valve (32) and the second directional control valve (33) are switched to the second state shown in FIG. 5 by the control unit (55). Thus, the air circuit (3) is configured such that the first adsorption cylinder (34) communicates with the suction port of the second pump mechanism (31b) and is blocked from the discharge port of the first pump mechanism (31a), and the second adsorption The cylinder (35) communicates with the discharge port of the first pump mechanism (31a) and enters the second connection state where it is blocked from the suction port of the second pump mechanism (31b). In this second connected state, the outside air pressurized by the first pump mechanism (31a) is supplied to the second adsorption cylinder (35), while the second pump mechanism (31b) is supplied to the first adsorption cylinder (34). Aspirate nitrogen-enriched air from

    Specifically, the first pump mechanism (31a) sucks and pressurizes the outside air via the outside air passage (41), and discharges the pressurized outside air (pressurized air) to the pressure passage (42). The pressurized air discharged into the pressurized passage (42) flows through the pressurized passage (42) and is located outside the unit case (36) and in the cooler (90) provided in the storage space (S2). Flow into. When the compressed air passes through the cooler (90), it is cooled by exchanging heat with the inside air having a temperature lower than that of the outside air.

    Similarly to the first operation, in the second operation, when condensed water is generated in the cooler (90), the condensed water is separated from the gas-liquid separator (92) provided on the downstream side of the cooler (90). Only the pressurized air that has been trapped and dehydrated is supplied to the second adsorption cylinder (35) via the pressure passage (42).

    In this way, the cooled and dehydrated pressurized air flows into the second adsorption cylinder (35), and the nitrogen component contained in the pressurized air is adsorbed by the adsorbent. Also in the second operation, by preliminarily cooling the pressurized air in the cooler (90), the adsorption performance to the adsorbent is improved as compared with the case of not cooling. Thus, during the second operation, the pressurized air is supplied from the first pump mechanism (31a) to the second adsorption cylinder (35), and the nitrogen component in the outside air is adsorbed by the adsorbent. As a result, oxygen-enriched air having a lower nitrogen concentration than the outside air and a higher oxygen concentration than the outside air is generated. The oxygen-enriched air flows out from the second adsorption cylinder (35) to the oxygen discharge passage (45).

    On the other hand, the second pump mechanism (31b) sucks air from the first adsorption cylinder (34). At that time, the nitrogen component adsorbed by the adsorbent of the first adsorption cylinder (34) is sucked together with air by the second pump mechanism (31b) and desorbed from the adsorbent. Thus, during the second operation, in the first adsorption cylinder (34), the internal air is sucked by the second pump mechanism (31b) and the nitrogen component adsorbed on the adsorbent is desorbed, so that the adsorbent Nitrogen-enriched air that contains the desorbed nitrogen component and has a higher nitrogen concentration than the outside air and a lower oxygen concentration than the outside air is generated. The nitrogen-enriched air is sucked into the second pump mechanism (31b), pressurized, and then discharged to the supply passage (44).

《Equal pressure operation》
As shown in FIG. 6, in the pressure equalizing operation, the control unit (55) switches the first direction control valve (32) to the first state, while the second direction control valve (33) is switched to the second state. . As a result, the air circuit (3) includes a first adsorption cylinder (34) and a second adsorption cylinder (35) that both communicate with the discharge port of the first pump mechanism (31a) and the second pump mechanism (31b). It will be in the 3rd connection state interrupted | blocked from the suction inlet. In this third connection state, outside air pressurized by the first pump mechanism (31a) is supplied to both the first adsorption cylinder (34) and the second adsorption cylinder (35), while the second pump mechanism (31b) ) Sucks the nitrogen-enriched air remaining in the decompression passage (43).

    Specifically, the first pump mechanism (31a) sucks and pressurizes the outside air via the outside air passage (41), and discharges the pressurized outside air (pressurized air) to the pressure passage (42). The pressurized air discharged into the pressurized passage (42) flows through the pressurized passage (42) and is located outside the unit case (36) and in the cooler (90) provided in the storage space (S2). Flow into. When the compressed air passes through the cooler (90), it is cooled by exchanging heat with the inside air having a temperature lower than that of the outside air.

    Also in the pressure equalization operation, as in the first operation and the second operation, when condensed water is generated in the cooler (90), the condensed water is separated into gas and liquid provided on the downstream side of the cooler (90). Only the pressurized air that has been captured and dehydrated by the vessel (92) is supplied to both the first adsorption cylinder (34) and the second adsorption cylinder (35) via the compression passage (42).

    In the first adsorption cylinder (34) and the second adsorption cylinder (35), the nitrogen component contained in the inflowing pressurized air is adsorbed by the adsorbent, and oxygen-enriched air is generated. The oxygen-enriched air flows out from the first adsorption cylinder (34) and the second adsorption cylinder (35) to the oxygen discharge passage (45).

    On the other hand, the second pump mechanism (31b) is disconnected from the first adsorption cylinder (34) and the second adsorption cylinder (35). Therefore, during the pressure equalization operation, nitrogen-concentrated air is not newly generated in the first adsorption cylinder (34) and the second adsorption cylinder (35), and the second pump mechanism (31b) The nitrogen-enriched air remaining in 43) is sucked and pressurized, and then discharged into the supply passage (44).

    By the way, as described above, during the first operation, the first adsorption cylinder (34) is pressurized by the first pump mechanism (31a) to perform the adsorption operation, and the second adsorption cylinder (35) has the second operation. The pressure is reduced by the pump mechanism (31b), and the desorption operation is performed. On the other hand, during the second operation, the second suction cylinder (35) is pressurized by the first pump mechanism (31a) to perform the suction operation, and the first suction cylinder (34) has the second pump mechanism (31b). The pressure is reduced by, and the desorption operation is performed. Therefore, when switching from the first operation to the second operation or switching from the second operation to the first operation without interposing the above-described pressure equalizing operation, immediately after the switching, the inside of the suction cylinder that has been performing the desorption operation before the switching is performed. Since the pressure is extremely low, it takes time for the pressure in the adsorption cylinder to rise, and the adsorption operation is not performed immediately.

    Therefore, in this embodiment, when switching from the first operation to the second operation and when switching from the second operation to the first operation, the air circuit (3) is switched to the third connection state, and the first adsorption cylinder (34 ) And the second adsorption cylinder (35) are communicated with each other via the first directional control valve (32) and the second directional control valve (33). As a result, the internal pressures of the first adsorption cylinder (34) and the second adsorption cylinder (35) quickly become equal to each other (becomes an intermediate pressure between the internal pressures). By such a pressure equalizing operation, the pressure in the adsorption cylinder that has been desorbed by the second pump mechanism (31b) before switching is quickly increased, so that the pressure to the first pump mechanism (31a) is increased. Adsorption operation is performed immediately after connection.

    In this way, in the gas supply device (30), nitrogen enriched air and oxygen enriched air are generated in the air circuit (3) by alternately repeating the first action and the second action while sandwiching the pressure equalizing action. The

(Gas supply operation / gas discharge operation)
Further, in the gas supply device (30), the gas supply operation for supplying the nitrogen-enriched air generated in the air circuit (3) into the container (11) and the desorption operation are started by the supply / discharge switching mechanism (70). The gas exhausting operation for exhausting the nitrogen-enriched air generated without supplying it into the container (11) for a predetermined time from the time is switched.

<Gas supply operation>
As shown in FIGS. 4 to 6, in the gas supply operation, the exhaust opening / closing valve (72) is controlled to the closed state and the supply side opening / closing valve (73) is controlled to the open state by the control unit (55). . As a result, the nitrogen-enriched air produced alternately in the first adsorption cylinder (34) and the second adsorption cylinder (35) is supplied into the container (11) through the supply passage (44), and the oxygen-enriched air Is discharged to the outside through the oxygen discharge passage (45).

《Gas discharge operation》
Although illustration is omitted, in the gas discharge operation, the control valve (55) controls the exhaust on-off valve (72) to the open state and the supply side on-off valve (73) to the closed state. Thus, the nitrogen-enriched air alternately generated in the first adsorption cylinder (34) and the second adsorption cylinder (35) and discharged to the supply passage (44) is supplied to the supply-side on / off valve (73) in the supply passage (44). ) Is prevented from flowing to the inside of the cabinet, and flows into the exhaust connection passage (71). The nitrogen-enriched air that has flowed into the exhaust connection passage (71) flows into the oxygen discharge passage (45) and is discharged outside the chamber together with the oxygen-enriched air flowing through the oxygen discharge passage (45).

(Drainage operation)
In the gas supply device (30), the controller (55) discharges the condensed water generated in the cooler (90) during the gas generation operation and captured in the tank (92a) of the gas-liquid separator (92) to the outside. A draining operation is performed. Specifically, the control unit (55) opens the drain valve (94) that was closed during the gas generation operation, so that the condensed water accumulated in the tank (92a) of the gas-liquid separator (92) It is discharged outside through the drainage passage (93).

    Incidentally, the tank (92a) of the gas-liquid separator (92) is provided in the pressurized passage (42) through which the pressurized air pressurized by the air pump (31) flows. Therefore, if the drain valve (94) provided in the drain passage (93) is opened during the operation of the air pump (31), the inside and outside of the tank (92a) of the gas-liquid separator (92) communicate with each other, The pressurized air passing through the tank (92a) of the liquid separator (92) may be discharged to the outside together with the condensed water through the drainage passage (93).

    Therefore, in this embodiment, the control unit (55) opens the drain valve (94) when the operation of the air pump (31) in which pressurized air is not supplied to the tank (92a) of the gas-liquid separator (92) is stopped. The drainage operation is to be performed. Thus, the tank (92a) of the gas-liquid separator (92) is opened by opening the drain valve (94) with the pressure inside and outside the tank (92a) of the gas-liquid separator (92) being almost equal. The pressurized air that passes through is not supplied to the adsorption cylinder (34, 35) and is not discharged together with the condensed water through the drainage passage (93).

[Exhaust section]
−Exhaust configuration−
As shown in FIG. 2, the exhaust part (46) includes an exhaust passage (46a) that connects the internal storage space (S2) and the external space, and an exhaust valve (46b) connected to the exhaust passage (46a). And a membrane filter (46c) provided at the inflow end (inner side end) of the exhaust passage (46a). The exhaust passage (46a) is provided so as to penetrate the casing (12) in and out. The exhaust valve (46b) is provided inside the exhaust passage (46a) and has an open state that allows air flow in the exhaust passage (46a) and a closed state that blocks air flow in the exhaust passage (46a). It is comprised by the solenoid valve which switches to. The opening / closing operation of the exhaust valve (46b) is controlled by the control unit (55).

−Exhaust operation−
During the rotation of the internal fan (26), the control unit (55) opens the exhaust valve (46b) so that the air in the internal storage space (S2) connected to the internal space (internal air) is outside the internal storage. Exhaust operation is performed.

    Specifically, when the internal fan (26) rotates, the pressure in the secondary space (S22) on the outlet side becomes higher than the pressure (atmospheric pressure) in the external space. Thus, when the exhaust valve (46b) is in an open state, the pressure difference (pressure difference between the external space and the secondary space (S22)) generated between both ends of the exhaust passage (46a) Air in the storage space (S2) connected to the inside (air in the storage) is discharged to the space outside the storage through the exhaust passage (46a).

[Sensor unit]
As shown in FIG. 2, the sensor unit (50) is provided in the secondary space (S22) on the outlet side of the internal fan (26) in the internal storage space (S2). The sensor unit (50) includes an oxygen sensor (51), a carbon dioxide sensor (52), a membrane filter (54), a communication pipe (56), and an exhaust pipe (57).

    The oxygen sensor (51) is a galvanic cell sensor. On the other hand, the carbon dioxide sensor (52) is configured by a non-dispersive infrared (NDIR) sensor. A branch pipe (81) of the measurement unit (80) is connected to the oxygen sensor (51), and the oxygen sensor (51) and the carbon dioxide sensor (52) are connected by a communication pipe (56). One end of an exhaust pipe (57) is connected to the carbon dioxide sensor (52), and the other end of the exhaust pipe (57) is opened in the vicinity of the suction port of the internal fan (26). The oxygen sensor (51) has a suction port for taking in ambient air, and a membrane filter (54) is provided in the suction port.

    With such a configuration, the secondary space (S22) and the primary space (S21) of the storage space (S2) are the membrane filter (54), oxygen sensor (51), communication pipe (56), carbon dioxide. The sensor (52) and the air passage (58) formed by the exhaust pipe (57) communicate with each other. Therefore, during operation of the internal fan (26), the pressure in the primary space (S21) becomes lower than the pressure in the secondary space (S22). In the air passage (58) connected to the carbon sensor (52), the in-compartment air flows from the secondary space (S22) side to the primary space (S21) side. In this way, the internal air passes through the oxygen sensor (51) and the carbon dioxide sensor (52) in order, the oxygen concentration of the internal air is measured by the oxygen sensor (51), and the carbon dioxide sensor (52) The carbon dioxide concentration of the internal air is measured. On the other hand, when the operation of the internal fan (26) is stopped and the air supply measurement operation described later is performed, the nitrogen-enriched air generated by the gas supply device (30) is supplied to the oxygen sensor via the branch pipe (81). (51), and the oxygen concentration of the nitrogen-enriched air is measured by the oxygen sensor (51).

[Control unit]
The control unit (55) is configured to execute a concentration adjustment operation for setting the oxygen concentration and the carbon dioxide concentration of the air inside the container (11) to desired concentrations. Specifically, the control unit (55) determines the composition (oxygen concentration and carbon dioxide concentration) of the air in the container (11) based on the measurement results of the oxygen sensor (51) and the carbon dioxide sensor (52). The operations of the gas supply device (30) and the exhaust unit (46) are controlled so as to obtain a desired composition (for example, oxygen concentration 5%, carbon dioxide concentration 5%).

    Further, the control unit (55) controls the operation of the measurement on-off valve (82) in accordance with a command from the user or periodically, and controls the oxygen concentration of the nitrogen-enriched air generated in the gas supply device (30) It is configured to perform an air supply measurement operation to measure.

    In the present embodiment, the control unit (55) includes a microcomputer that controls each element of the CA device (60) as disclosed in the present application, and a memory, a hard disk, and the like in which an executable control program is stored. Yes. The control unit (55) is an example of the control unit of the CA device (60), and the detailed structure and algorithm of the control unit (55) are not limited to any hardware that executes the function according to the present invention. It may be a combination with software.

-Driving action-
<Operation of refrigerant circuit>
In the present embodiment, a cooling operation for cooling the internal air of the container (11) is executed by the unit controller (100) shown in FIG.

    In the cooling operation, the operation of the compressor (21), the expansion valve (23), the external fan (25), and the internal fan (26) is performed based on the measurement result of a temperature sensor (not shown) by the unit controller (100). Thus, the temperature of the internal air is controlled to a desired target temperature. At this time, in the refrigerant circuit (20), the refrigerant circulates to perform a vapor compression refrigeration cycle. Then, the internal air of the container (11) guided to the internal storage space (S2) by the internal fan (26) flows through the evaporator (24) when passing through the evaporator (24). Cooled by the refrigerant. The in-compartment air cooled in the evaporator (24) is blown out again from the outlet (18b) into the container (11) through the underfloor channel (19a). Thereby, the internal air of the container (11) is cooled.

<Density adjustment operation>
Further, in the present embodiment, the control unit (55) shown in FIG. 4 causes the CA device (60) to change the composition (oxygen concentration and carbon dioxide concentration) of the interior air of the container (11) to a desired composition (for example, The concentration adjustment operation is performed to adjust the oxygen concentration to 5% and the carbon dioxide concentration to 5%. In the concentration adjustment operation, based on the measurement results of the oxygen sensor (51) and the carbon dioxide sensor (52) by the control unit (55), the composition of the air in the container (11) becomes a desired composition. The operations of the gas supply device (30) and the exhaust unit (46) are controlled.

    During the concentration adjustment operation, the control unit (55) controls the measurement on-off valve (82) to be closed. During the concentration adjustment operation, the control unit (55) communicates with the unit control unit (100), and the unit control unit (100) rotates the internal fan (26). Accordingly, the internal air is supplied to the oxygen sensor (51) and the carbon dioxide sensor (52) by the internal fan (26), and the oxygen concentration and the carbon dioxide concentration of the internal air are measured. .

(Adjustment of oxygen concentration)
When the oxygen concentration of the indoor air measured by the oxygen sensor (51) is higher than 8%, the control unit (55) generates nitrogen-enriched air by the gas generating operation, and the nitrogen-enriched air is supplied to the container (11). The gas supply operation to supply the inside of the container is executed.

    Specifically, the control unit (55) switches between the first directional control valve (32) and the second directional control valve (33) to sandwich the pressure equalizing operation (see FIG. 6) and perform the first operation (FIG. 4). ) And the second operation (see FIG. 5) are alternately repeated to generate nitrogen-enriched air in which the nitrogen concentration is higher than the outside air and the oxygen concentration is lower than the outside air (gas generation operation). In the present embodiment, the operation time of the first operation and the second operation is set to 14.5 seconds, and the operation time of the pressure equalizing operation is set to 1.5 seconds. The control unit (55) controls the exhaust on-off valve (72) to be closed and the supply-side on-off valve (73) to be in the open state, so that the nitrogen-enriched air generated by the gas generation operation can be stored in the container (11 The gas supply operation to supply the inside of the cabinet is performed. In this embodiment, the average nitrogen concentration (average value of the nitrogen concentration of the nitrogen-enriched air supplied into the storage in each operation of the first operation and the second operation) is 92% in the container (11). The nitrogen-enriched air having an average oxygen concentration (average value of the oxygen concentration of the nitrogen-enriched air supplied into the cabinet in each of the first operation and the second operation) of 8% is supplied.

    Further, the control unit (55) controls the exhaust valve (46b) of the exhaust unit (46) to be in an open state to perform an exhaust operation, and supplies nitrogen-enriched air into the container (11) through the gas supply operation. Exhaust the air inside the cabinet to the outside.

    In the concentration adjustment operation, the internal air is replaced with nitrogen-enriched air by the gas supply operation and the exhaust operation as described above, and the oxygen concentration of the internal air decreases.

    When the oxygen concentration of the air in the container (11) is reduced to 8%, the control unit (55) stops the gas supply operation by stopping the operation of the gas supply device (30) and the exhaust valve (46b). To stop the exhaust operation.

    When the gas supply operation and the exhaust operation are stopped, no air is exchanged in the container (11), while the plant (15) breathes, so oxygen in the air in the container (11) The concentration decreases and the carbon dioxide concentration increases. Thereby, the oxygen concentration of the air in the cabinet eventually reaches 5% of the target oxygen concentration.

    If the oxygen concentration in the air in the container (11) is lower than 5% due to breathing, the operation of the gas supply device (30) is restarted, and nitrogen-enriched air with an average oxygen concentration of 8% is stored in the container. (11) Gas supply operation to supply the inside of the chamber, and the exhaust valve (46b) of the exhaust section (46) is controlled to be in an open state, and the nitrogen supply air is supplied to the container (11) by the gas supply operation. Exhaust operation is performed to exhaust the air inside the chamber to the outside. By such gas supply operation and exhaust operation, the internal air is replaced with nitrogen-enriched air (for example, an average oxygen concentration of 8%) having a higher oxygen concentration than the internal air, so the storage of the container (11) The oxygen concentration in the internal air increases.

    When the oxygen concentration of the indoor air reaches a value (5.5%) higher than the target oxygen concentration (5%) by a predetermined concentration (for example, 0.5%), the control unit (55) The operation of 30) is stopped to stop the gas supply operation, and the exhaust valve (46b) is closed to stop the exhaust operation.

    The oxygen concentration of the internal air is adjusted by opening the bypass on-off valve (48) and using the first and second adsorption cylinders (34, 35) as the outside air sucked into the air pump (31) instead of the gas supply operation. ) May be bypassed without passing, and the outside air introduction operation may be performed to supply the container (11) as it is. According to the outside air introduction operation and the exhaust operation, the inside air is replaced with outside air having an oxygen concentration of 21%, so that the oxygen concentration of the inside air of the container (11) increases.

    In this embodiment, the gas supply operation and the exhaust operation are stopped and the respiration of the plant (15) is used to reduce the oxygen concentration of the air in the container (11) from 8% to 5%. It was lowered. However, the method of reducing the oxygen concentration in the air in the container (11) from 8% to 5% is not limited to this. For example, in the initial stage of the desorption operation (immediately after the start of each operation of the first operation and the second operation), a gas discharge operation for discharging the generated nitrogen-enriched air to the outside is performed, and generated at other timings. It is good also as performing the gas supply operation | movement which supplies nitrogen enriched air in a store | warehouse | chamber. At the beginning of the desorption operation, outside air remains in the adsorption cylinder, piping, etc., so nitrogen-enriched air with a relatively high oxygen concentration is generated. At the end of the desorption operation, the pressure in the adsorption cylinder is higher than the initial pressure. In order to decrease, a large amount of nitrogen component is desorbed, and nitrogen-enriched air having a relatively low oxygen concentration is generated. Therefore, by performing the gas discharge operation before such a gas supply operation, nitrogen-enriched air having a relatively high oxygen concentration immediately after the start of the desorption operation is not supplied into the container (11), and the container (11 Only the nitrogen-enriched air having a relatively low oxygen concentration (for example, the average nitrogen concentration is 95% and the average oxygen concentration is 5%). By such gas discharge operation, gas supply operation, and exhaust operation, the oxygen concentration of the air in the container (11) may be reduced from 8% to 5%.

(Adjustment of carbon dioxide concentration)
The controller (55) operates the gas supply device (30) to perform a gas supply operation when the carbon dioxide concentration of the internal air measured by the carbon dioxide sensor (52) is higher than 5%, and exhausts the exhaust gas. The valve (46b) is opened to perform the exhaust operation. By such gas supply operation and exhaust operation, the inside air is replaced with nitrogen-enriched air having a carbon dioxide concentration of 0.03%, so that the carbon dioxide concentration in the inside air of the container (11) is lowered.

    When the carbon dioxide concentration in the internal air of the control unit (55) becomes a value (4.5%) lower than the target carbon dioxide concentration (5%) by a predetermined concentration (for example, 0.5%), the gas supply The operation of the device (30) is stopped to stop the gas supply operation, and the exhaust valve (46b) is closed to stop the exhaust operation.

    The adjustment of the carbon dioxide concentration of the inside air may be performed by opening the bypass opening / closing valve (48) and performing the above-described outside air introduction operation instead of the gas supply operation. Thus, according to the outside air introduction operation and the exhaust operation, the inside air is replaced with the outside air having a carbon dioxide concentration of 0.03%, so that the carbon dioxide concentration in the inside air of the container (11) is lowered.

[Air supply measurement operation]
Moreover, a control part (55) performs the air supply measurement operation | movement which measures the oxygen concentration of the nitrogen concentration air produced | generated in the gas supply apparatus (30) by the instruction | command from a user or regularly (for example, every 10 days). . The air supply measurement operation is performed in parallel when the internal fan (26) stops during the gas supply operation such as the above-described concentration adjustment operation or trial operation.

    During the gas supply operation, the control unit (55) controls the measurement on-off valve (82) to an open state and controls the supply-side on-off valve (73) to a closed state. Thereby, all of the nitrogen enriched air flowing through the supply passage (44) flows into the branch pipe (81). The nitrogen-enriched air that has flowed into the branch pipe (81) flows into the oxygen sensor (51), and the oxygen concentration is measured.

    Thus, the composition (oxygen concentration, nitrogen concentration) of the nitrogen-enriched air generated in the gas supply device (30) is desired by measuring the oxygen concentration of the nitrogen-enriched air generated in the gas supply device (30). Can be confirmed.

-Effect of the embodiment-
As described above, according to the present embodiment, the cooler (90) is provided in the pressure passage (42) connecting the first pump mechanism (31a) and the first and second adsorption cylinders (34, 35), The pressurized air was cooled with external air and then supplied to the first and second adsorption cylinders (34, 35). Therefore, the temperature of the pressurized air supplied to the first and second adsorption cylinders (34, 35) is lower than when no cooler (90) is provided. Thereby, it becomes easy to adsorb | suck the predetermined component in pressurized air to adsorption agent in adsorption operation. Therefore, in the gas supply device (30) including the air pump (31) and the first and second adsorption cylinders (34, 35), the adsorption performance of the adsorbent can be improved, and the container (11) can be stored. The composition of the internal air can be adjusted efficiently.

    Moreover, according to this embodiment, the pressurization channel | path which connects the pressurization part (31a) of the air pump (31) accommodated inside the unit case (36), and the 1st and 2nd adsorption | suction cylinder (34,35). The cooler (90) provided in (42) is arranged outside the unit case (36). Therefore, the first and second adsorption cylinders (34, 35) and the air pump (31) are accommodated inside the unit case (36), and the air inside the unit case (36) is in operation while the air pump (31) is in operation. Even in an environment where the temperature rises remarkably, the cooler (90) can reliably cool the pressurized air with the air outside the unit case (36).

    Further, according to the present embodiment, the cooler (90) is disposed in the container (storage space (S2)) of the container (11) as a refrigerated storage, and pressurized air is supplied to the cooler (90). It was decided to supply the first and second adsorption cylinders (34, 35) after cooling with cooler internal air than the outside air. Therefore, the temperature of the pressurized air supplied to the first and second adsorption cylinders (34, 35) is lower than when the cooler (90) is provided outside the container (11). Thereby, it becomes easy to adsorb | suck the predetermined component in pressurized air by adsorption agent in adsorption operation. Therefore, in the gas supply device (30) including the air pump (31) and the first and second adsorption cylinders (34, 35), the adsorption performance of the adsorbent can be further improved.

    In addition, according to the present embodiment, the gas-liquid separator (92) is provided on the downstream side of the cooler (90) in the pressurizing passage (42), and a part of the pressurized air is supplied from the outside air in the cooler (90). Even in the case where the air is cooled and condensed by the low-temperature chamber air, the condensed water is separated from the pressurized air and captured by the gas-liquid separator (92), so that only the pressurized air is collected. It was made to supply to 2 adsorption cylinders (34,35). Therefore, the condensed water is prevented from adhering to the adsorbent and the adsorbent adsorption performance is significantly lowered, while the pressurized air cooled to the dew point temperature is supplied to the first and second adsorption cylinders (34, 35). By doing so, the adsorption performance of the adsorbent can be maximized.

    By the way, the gas-liquid separator (92) is provided in the pressurized passage (42) through which the pressurized air pressurized by the air pump (31) flows. Therefore, if the drain valve (94) of the drainage passage (93) is opened during operation of the air pump (31), the inside and outside of the gas-liquid separator (92) communicate with each other, and the inside of the gas-liquid separator (92) There is a possibility that the pressurized air passing therethrough is discharged to the outside together with the condensed water through the drainage passage (93).

    Therefore, in the present embodiment, the drain valve (94) is opened when the operation of the air pump (31) where pressurized air is not supplied to the gas-liquid separator (92) is stopped. In this way, pressurized air passing through the gas-liquid separator (92) is supplied to the adsorption cylinder by opening the drain valve (94) with the pressure inside and outside the gas-liquid separator (92) being almost equal. Without being discharged together with the condensed water through the drainage passage (93), it can be prevented.

    Further, according to the present embodiment, the cooler (90) is constituted by a copper pipe and is connected to the midway part of the pressurizing passage (42) constituted by a resin tube. Therefore, the cooler (90) can be easily configured simply by connecting a copper tube to the middle portion of the resin tube.

<< Other Embodiments >>
About each said embodiment, it is good also as the following structures.

    In the said embodiment, it was supposed that the cooler (90) was provided in the storage (internal storage space (S2)) of the container (11) as a refrigerated storage. However, the cooler (90) may be provided in any place as long as the environment can cool the pressurized air flowing inside. For example, as shown in FIG. 8, the cooler (90) has a copper tube connected to a midway part of the pressurizing passage (42) constituted by a resin tube, and the copper tube is simply connected to the unit case (36). It may be arranged outside, that is, outside the storage space (S1). In this case, the cooler (90) is preferably provided in the first space (S11) below the condenser (22) in the external storage space (S1). In the outside storage space (S1), during operation of the outside fan (25) provided in the second space (S12) above the condenser (22), the first space (S11) to the second space ( Outside air flows toward S12). Therefore, when the cooler (90) is provided in the first space (S11), the upstream air flow formed by the external fan (25) in the external storage space (S1) is more upstream than the condenser (22). The cooler (90) will be arranged on the side. With such an arrangement, the outside air is forcibly supplied to the cooler (90) while the outside fan (25) is in operation, so that the pressurized air can be sufficiently cooled. In addition, since the outside air having a relatively low temperature before being heated by the refrigerant in the refrigerant circuit (20) in the condenser (22) is supplied to the cooler (90), this also causes the cooler (90 ) Can sufficiently cool the pressurized air.

    Moreover, when arrange | positioning a cooler (90) out of a warehouse in this way, the drainage unit (91) provided in order to remove the condensed water in the pressurized air produced in the cooler (90) in the said embodiment Is not required. As shown in FIG. 9, when the cooler (90) is provided outside the storage, the drainage unit (91) may not be provided, and the drainage unit (91) is stored outside the storage in the same manner as the cooler (90). It may be provided in (S1).

    In the said embodiment, although the cooler (90) was comprised with the copper pipe, the structure of a cooler (90) is not restricted to this. The cooler (90) may have any configuration as long as it can cool the pressurized air flowing through the inside by exchanging heat with the outside air.

    In the above embodiment, one air pump (31) has the first pump mechanism (31a) and the second pump mechanism (31b). However, the first pump mechanism (31a) and the second pump mechanism (31b) May be constituted by two individual air pumps.

    In each of the above embodiments, the first adsorption unit and the second adsorption unit are configured to perform adsorption and desorption of nitrogen using one adsorption cylinder. The number is not limited to one. For example, each suction part may be constituted by three suction cylinders, and a total of six suction cylinders may be used.

    Moreover, although each said embodiment demonstrated the example which applied the CA apparatus (60) which concerns on this invention to the container refrigeration apparatus (10) provided in the container (11) for marine transportation, CA concerning this invention The use of the device (60) is not limited to this. The CA device (60) according to the present invention can be used for adjusting the composition of air in a warehouse, for example, a container for land transportation, a simple refrigerated warehouse, a warehouse at room temperature, in addition to a container for sea transportation.

    As described above, the present invention is useful for a gas supply device that supplies a regulated gas having a predetermined composition into a container and a container refrigeration device including the gas supply device.

10 Container refrigeration equipment
11 Container
20 Refrigerant circuit
22 Condenser
25 Outside fan
30 Gas supply device
31 Air pump
31a First pump mechanism (pressure unit)
31b Second pump mechanism (decompression unit)
34 First adsorption cylinder
35 Second adsorption cylinder
36 unit case
42 Pressurizing passage
90 cooler
91 Drainage unit
92 Gas-liquid separator
93 Drainage passage
94 Drain valve (open / close valve)

Claims (8)

Provided in the storage (11),
An adsorption cylinder (34, 35) in which an adsorbent that adsorbs a predetermined component in the air is housed;
The pressurized cylinder (34, 35) is pressurized by supplying pressurized air to the adsorption cylinder (34, 35), and the predetermined cylinder in the pressurized air is supplied to the adsorption cylinder (34, 35). A pressure part (31a) for performing an adsorption operation for adsorbing the component to the adsorbent, and depressurizing the adsorption cylinder (34, 35) by sucking air from the inside of the adsorption cylinder (34, 35); An air pump (31) having a pressure reducing part (31b) for performing a desorption operation for desorbing the predetermined component adsorbed to the adsorbent in the air in the adsorption cylinder (34, 35),
A gas supply device that alternately performs the adsorption operation and the desorption operation in the adsorption cylinder (34, 35) to generate a regulated gas having a desired composition and supplies the adjusted gas into the storage (11). ,
Provided in a pressure passage (42) connecting the pressure part (31a) and the adsorption cylinder (34, 35), heat exchange is performed between the pressurized air flowing inside and the outside air, and the compressed air is A gas supply device comprising a cooler (90) for cooling. In claim 1,
A unit case (36) for accommodating the suction cylinder (34, 35) and the air pump (31) inside;
The gas supply device according to claim 1, wherein the cooler (90) is disposed outside the unit case (36). In claim 2,
The storage (11) is a refrigerated storage that is cooled so that the temperature inside the storage is lower than the temperature outside.
The unit case (36) is disposed outside the storage (11),
The gas supply device according to claim 1, wherein the cooler (90) is disposed in the storage (11). In claim 3,
The pressurized passage (42) is provided on the downstream side of the cooler (90), and condensate generated by condensing a part of the pressurized air in the cooler (90) is separated from the pressurized air. A gas supply device comprising a gas-liquid separator (92) for capturing. In claim 4,
A drainage passage (93) connected to the gas-liquid separator (92) and discharging condensed water in the gas-liquid separator (92) to the outside;
An open / close valve (94) provided in the drainage passage (93) for opening and closing the drainage passage (93);
When the operation of the air pump (31) is stopped, the on-off valve (94) is opened to perform a draining operation for discharging the condensed water captured by the gas-liquid separator (92) to the outside. A gas supply device. In any one of Claims 1 thru | or 5,
The pressurizing passage (42) is constituted by a resin tube,
The gas supply device, wherein the cooler (90) is constituted by a copper pipe connected to a midway part of the tube. It is attached to the container (11) where the plants that breathe are stored,
A refrigerant circuit (20) for performing a refrigeration cycle to cool the air in the container (11),
A gas supply device (30) for generating a regulated gas having a predetermined composition and supplying it into the container (11);
A container refrigeration apparatus for adjusting the temperature and composition of the air inside the container (11) to a desired state,
The said gas supply apparatus (30) is comprised by the gas supply apparatus any one of Claims 1 thru | or 6 which supplies the said adjustment gas in the store | warehouse | chamber (11) by using the said container (11) as the said storage (11). A container refrigeration system characterized by the above. In claim 7,
A casing (12) that forms an internal storage space (S2) that is connected to the inside of the container (11) and an external storage space (S1) that is connected to the outside of the container (11). With
The outside storage space (S1) includes a condenser (22) connected to the refrigerant circuit (20), an outside fan (25) for guiding outside air to the condenser (22), and the gas A supply device (30),
The cooler (90) is disposed upstream of the condenser (22) in the flow of outside air formed by the outside fan (25) in the outside storage space (S1). A gas supply device.

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