JP2003097881A - Refrigeration unit for container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration unit for a container capable of securing reliability of an inverter by effectively cooling inverter-related parts for composing the inverter and enabling the inverter to be mounted in a narrower space. SOLUTION: A heat sink 52 as a heat radiation means is installed on an inverter box 51 housing the inverter-related parts, and the heat sink 52 is housed in a duct 50. One end of the duct 50 composes an outside air introducing port 50a formed on the outer side of this refrigeration unit for a container 2. The other end is composed as an air outlet 50b disposed close to a condenser fan 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container refrigerating apparatus suitable for being loaded on a ship or the like, and more particularly to a container refrigerating apparatus operated by inverter control.

[0002]

2. Description of the Related Art Conventionally, as this type of container refrigerating device, one having a structure as shown in FIGS. 3 and 4 is known. FIG. 3 is a front view for explaining the structure of a conventional container refrigerating apparatus, and FIG. 4 is a sectional view taken along the line BB in FIG. In FIG. 3, reference numeral 2 is a container refrigerating device provided on the end wall of the container, 3 is a compressor, 4 is an air-cooled condenser (condenser), 5 is a water-cooled condenser (condenser), 6 is a condenser fan, and 8 is electronic expansion. A valve, 9 is an accumulator, 10 is a control box, and 11 is an outer plate that partially covers the container refrigerating apparatus 2 (which is located in front of each apparatus in the drawing). Further, reference numeral S1 indicates a condenser section S1 which is a recess in which equipment such as the compressor 3, the air-cooled condenser 4, the water-cooled condenser 5, the condenser fan 6 and the like is installed, and is partially covered by an outer plate 11.

Further, in FIG. 4, reference numeral 1 is a container,
Reference numeral 1a denotes an end wall of the container 1, reference numeral 7 denotes a condenser fan motor for rotating the condenser fan 6, and 14a
Is an inner partition wall, 14b is an outer partition wall, 15 is an outlet ventilation passage, 28 is an evaporator fan, 29 is an evaporator fan motor, 30 is an evaporator, 31 is a drain pan, 32 is a suction port, S is the inside of the container 1, S2 indicates an evaporator section that accommodates the evaporator 30 and the like.

Generally, the container refrigerating device 2 is assembled to one end wall 1a of the container 1 having a rectangular parallelepiped shape. Then, this container 1 stores a load or the like in the interior S from a door provided on the other end wall (not shown), and operates the container refrigerating device 2 provided on the end wall 1a, whereby the container 1 The temperature of the inside S of the room is -30 ℃
It is designed to be loaded and transported on ships, trucks, railway vehicles, etc., while maintaining an arbitrarily set temperature within a range of about + 25 ° C.

The container refrigerating device 2 is provided on the end wall 1a of the container 1 as described above, and is separated from the inside S of the container 1 by the outer partition wall 14b. On the device side of the outer partition wall 14b (on the left side in FIG. 4), an evaporator section S2 forming a passage for sucking the air in the inside S
And a blower air passage a1 are formed, and an evaporator 30 is provided at a substantially middle portion of the evaporator section S2. An evaporator fan 28, which is rotationally driven by an evaporator fan motor 29, is installed above the evaporator 30. Further, above the evaporator fan 28, a suction port 32 for sucking the air in the inside S is provided, and in the vicinity of this, a suction temperature sensor (not shown) for detecting the temperature of the inflowing air is provided. Evaporator 3
Below 0, a blow-out air passage 15 is formed in which the air that has flowed through here is blown out toward the inside S again, and the container 1
Communicates with an outlet chamber 33 provided on the bottom surface of the. A blowout temperature sensor 11 (not shown) is provided in the blowout air passage 15 near the blowout chamber 33.

Further, a recess is formed on the wall surface of the container refrigerating device 2, and a flat plate-shaped air-cooling condenser 4 is provided at a substantially central portion thereof. Further, a pipe-shaped water-cooled condenser 5 is provided in parallel with the air-cooled condenser 4. Equipment such as the compressor 3 is installed below the air-cooled condenser 4, and equipment such as the condenser fan 6, the condenser fan motor 7 for rotating and driving the condenser fan 6, and the control box 10 are installed above the air-cooled condenser 4.

The operation of the container refrigeration system 2 will be described. The gas refrigerant compressed by the compressor 3 is discharged from here and flows through a pipe (not shown) to enter the air-cooled condenser 4 and / or the water-cooled condenser 5. Condenser fan 6 rotated by a condenser fan motor 7
By the exhaust action of, the outside air is sucked into the air-cooled condenser 4 and / or the water-cooled condenser 5, and at this time, the heat exchange between the gas refrigerant and the outside air is performed, and the gas refrigerant is condensed and liquefied. The liquid refrigerant obtained by condensing and liquefying is the dryer 13 and the strainer 1.
After passing through 2, it enters the electronic expansion valve 8 and is throttled here to adiabatically expand to become a gas-liquid two-phase refrigerant. This refrigerant enters the evaporator 30 and evaporates and evaporates by cooling the air in the inside S stored therein from the suction port 32. Then, the evaporated and vaporized refrigerant (that is, the gas refrigerant) returns to the compressor 3 via the accumulator 9.

The air in the compartment S is sucked into the suction port 3 by the suction action of the evaporator fan 28 which is rotationally driven by the evaporator fan motor 29 as shown by the solid arrow in FIG.
Enter from 2 and enter the evaporator section S2. Further, the air is supplied to the evaporator 3 by the evaporator fan 28.
It is blown toward 0 and is cooled in the process of passing through the evaporator 30. Then, the cooled air flows through the blowout air passage 15 into the blowout chamber 33, and is blown out from a large number of gaps laid on the bottom surface of the inside S. The blown air circulates in the inside S of the container, enters through the suction port 32 located at the upper part of the container 1, and follows the path described above again.

When the air-cooled condenser 4 is used, the condenser fan 6 is driven by the condenser fan motor 7. Then, the outside air is heated by exchanging heat with the gas refrigerant in the process of passing through the air-cooled condenser 4 as indicated by a dashed arrow, and then is urged by the condenser fan 6 to be discharged into the atmosphere.

When the water-cooled condenser 5 is used, a water supply pipe (not shown) is connected to the inlet-side connecting fitting 25 shown in FIG. 3, and a drain pipe (not shown) is connected to the outlet-side connecting fitting 26 to connect the water control valve 24. Open and stop the condenser fan 6. Then, the cooling water supplied from the water supply pipe enters the water cooling condenser 5 from the inlet-side connecting fitting 25 through a water pipe (not shown), and is heated there by exchanging heat with the gas refrigerant. Outlet side fitting 2 through valve 24
It is discharged from 6 through the drain pipe.

Drain condensed on the evaporator 30 is dropped on the drain pan 31, and is discharged to the outside of the container 1 through the drain hose (not shown) from the drain port 22 arranged in the lower portion of the container refrigerating device 2 shown in FIG. It

In such a container refrigerating apparatus 2, in recent years, further efficiency of operation and energy saving effect have been demanded, and operation control using an inverter is being performed. The inverter is a device that performs frequency conversion control, and can continuously switch and control the number of rotations of the motor. The inverter mentioned here is an assembly composed of a plurality of related parts, and is configured as a part of a control circuit of the container refrigerating apparatus 2. Therefore, the operation of the container refrigeration apparatus 2 can be freely adjusted by changing the refrigerant compression amount in the compressor 3 by, for example, changing the rotation speed of the scroll or the like, and is optimal according to the cooling situation in the container 1. It becomes possible to drive.

[0013]

However, when an inverter is formed in the conventional container refrigeration system described above,
There were many problems in heat resistance of the inverter and securing a space for installing the inverter.

The heat resistance of the former inverter will be described. The inverter is composed of a plurality of related components that make up the inverter. When these inverter-related parts are installed in the container refrigeration system, they are housed in the inverter box. This is because the inverter-related parts are precision parts that need to be covered, and it is necessary to protect the inverter-related parts from wind and rain, and also from salt damage when they are transported by sea such as ships. is there. The inverter described in the present specification includes an inverter-related component and an inverter box (inverter) that houses the same.

There is a power transistor as one of the related parts constituting this inverter. This power transistor generates heat during operation and raises the temperature in the sealed inverter box. In addition to power transistors, there are multiple inverter-related parts that generate heat, and less than 5% of the power consumption of the container refrigeration system is generated by the inverter-related parts. There is of course a limit to the heat resistance temperature of inverter-related parts, and it is necessary to pay attention to the heat generated by itself and the temperature condition of the outside air. In particular, a container refrigerating apparatus that has a standby state in a port in a high temperature area is the worst environment for the inverter, and therefore it is necessary to cool the inverter by providing a heat radiation means.

Further, the space securing for installing the latter inverter will be described. The refrigerating apparatus for a container, which has the highest priority in securing the volume in the container, must be constructed so that this thickness is as thin as possible. Further, in recent years, the capacity of the condenser has become larger than that of the conventional one in response to the demand for increasing the refrigerating capacity, and many devices are densely installed in the condenser section. Inverters are becoming smaller and smaller in size than before, but it is difficult to secure a space for installing a heat radiating means in the capacitor section.

As shown in FIG. 3, when the plate-shaped air-cooled condenser 4 is arranged in the central portion of the condenser section S1, the inverter box for accommodating inverter-related parts is installed either above or below the air-cooled condenser 4 in between. Will be done.

When the inverter box is installed below the air-cooled condenser 4, the compressor 3 is installed in this installation space.
It is difficult to install an inverter having a heat dissipation means for cooling the inverter box and inverter-related parts because many devices such as the above are present.

A further problem is that the heat dissipating means needs a large volume and shape in order to perform the heat dissipating function required for the inverter. A heat sink (heat dissipation means) which is frequently used as the heat dissipation means will be described as an example. The heat sink has a structure for absorbing heat from electronic components or elements and dissipating it to the outside, and is a cooling radiator. When heat dissipation is promoted by exposing the heat sink to air, the amount of heat dissipation decreases when the flow of air is small, so it is necessary to increase the size of the heat sink and increase the amount of heat dissipation. Then, in the capacitor section S1 in which the depth of the recess is thin,
It becomes difficult to install a large heat sink and an inverter box (inverter) which is the main body.

When the inverter box is installed above the air-cooled condenser 4, a relatively large space can be secured, but there is a problem with heat. This is an air-cooled condenser 4
5 to 1 from the outside air that has passed through the air-cooled condenser 4 above
Because the air whose temperature has risen by about 0 ° C is flowing,
This is because when the temperature of the outside air is high, it is not suitable to use it for cooling the inverter-related parts.

The present invention has been made in view of the above circumstances, and the reliability of the inverter is ensured by effectively cooling the inverter-related parts constituting the inverter, and the inverter can be mounted in a narrow space. An object is to provide a refrigerating device for a container.

[0022]

The present invention adopts the following means in order to solve the above problems. The refrigeration system for a container according to claim 1 includes a condenser that is provided integrally with the container and that exchanges heat with the outside air, a condenser fan that allows the outside air to flow through the condenser, and an inverter that controls the operating capacity. In the container refrigeration equipment provided,
The inverter is provided with a heat radiating means, and the heat radiating means is provided in a flow path of outside air which is made to flow by the condenser fan.

The inverter is connected to heat radiation means for radiating the heat generated by itself, and the heat of the inverter is transferred to the heat radiation means. Then, by disposing the heat radiating means in the flow path through which the outside air circulates, heat exchange is performed between the outside air and the heat radiating means. Therefore, the heat generated from the inverter is radiated to the outside air through the heat radiating means, and the temperature rise of the inverter, in other words, the inverter-related parts is suppressed. The outside air flowing through the heat radiating means is the outside air blown or sucked by the condenser fan and may be passed through the condenser or may be exhausted as it is.

The container refrigerating apparatus according to claim 2 is
The refrigeration apparatus for containers according to claim 1, wherein the distribution path is provided with a fan for forcibly ventilating the air in the distribution path.

By providing the fan in the distribution path of the outside air, the flow velocity of the outside air flowing in the distribution path is increased, and more heat generated from the inverter is exchanged with the outside air by the heat radiation means provided in the distribution path. It

The refrigerating apparatus for containers according to claim 3 is
In the container refrigeration apparatus according to claim 1 or 2, the heat radiation means is housed in a duct forming a part of the distribution path.

At least a flow of outside air due to the condenser fan occurs in the duct, and the heat radiating means is housed in the duct, so that heat exchange is performed between the outside air flowing in the duct and the heat radiating means. By using the duct, the air whose temperature has risen due to the condenser and the like does not enter the duct, and the air having a temperature substantially equal to the outside air temperature circulates through the heat radiating means to perform heat exchange. By changing the shape of the duct, it becomes possible to easily change the flow velocity and flow rate of the outside air flowing through the duct. For example, by making the duct shape larger on the intake side of the outside air than the portion in which the heat radiating means is housed, the action of increasing the flow velocity in the heat radiating means is promoted.

The container refrigerating apparatus according to claim 4 is
The refrigerating apparatus for containers according to claim 3 is characterized in that one end of the duct is provided so as to open near the condenser fan.

Since one end of the duct is opened in the vicinity of the condenser fan, a large suction action or a blowing action is exerted on the one end of the opened duct to increase the flow velocity in the duct. Therefore, a larger amount of air flows through the heat dissipation means housed in the duct.

The container refrigerating apparatus according to claim 5 is
The container refrigerating apparatus according to any one of claims 1 to 4, wherein the heat radiating means is a heat sink.

By using a heat sink as the heat dissipation means, the heat generated from the inverter is transferred to the heat sink,
Heat is radiated to the outside air from the heat radiation portion formed on the heat sink.

A refrigeration system for containers according to claim 6 is
In a container refrigerating apparatus provided with a container, comprising a blow-out air passage through which air cooled by an evaporator is blown out into the container at least, and an inverter for controlling operating capacity, the inverter comprises a heat radiating means. The refrigerating apparatus for a container, wherein the heat radiating means is provided so as to project in the blowout air passage.

Since the heat radiating means provided in the inverter protrudes into the blowout air passage through which the air cooled by the evaporator flows, the heat of the inverter transferred to the heat radiating means is cooled in the blowout air passage. The heat will be exchanged with the generated air. Since low-temperature air that cools the inside of the container circulates in the blow-out air passage, it is desirable that the heat dissipation means protruding there be formed so as not to obstruct the air circulation. Further, by adopting a configuration in which a part of the blowout air passage is adopted for cooling the heat radiating means, the heat radiating means is cooled by the air cooled by the evaporator as described above. The heat radiating means exchanges heat with the air flowing through the blowout air passage, and the heat exchanging substance may be made of metal, fluid, or a combination thereof. When using a fluid, it is desirable to circulate the fluid within the heat dissipation means.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are views for explaining the configuration of a container refrigerating apparatus 2 in the present embodiment, FIG. 1 is a front view of the container refrigerating apparatus, and FIG. 2 is a sectional view taken along the line AA of FIG. is there.

In FIG. 1, reference numeral 50 is a duct and 50a.
Is an outside air introduction port of the duct 50, 50b is an exhaust port of the duct 50, 51 is an inverter box (inverter) for accommodating inverter-related parts, and 52 is an inverter box 51.
2 shows a heat sink (heat dissipation means) located on the back side of the. The other reference numerals are the same as those of the conventional container refrigerating apparatus, and the description thereof will be omitted. Further, in FIG. 2, reference numeral 1a indicates an end wall of the container 1, 11 indicates an outer plate partially covering the capacitor section S1, and 11a indicates a hole formed in the outer plate 11.

The air-cooled condenser 4 and the water-cooled condenser 5 are juxtaposed in the vertical direction, and are installed at substantially the center of the condenser section S1 which is a recess formed in the wall surface of the container refrigerating apparatus 2. Below the air-cooled condenser 4, devices such as a compressor 3, an accumulator 9, 200V or 400V power plugs 16, 17, a power transformer 18, a dryer 13, and a strainer 12 are installed. Further, devices such as a control box 10, a condenser fan 6, a condenser fan motor 7 (see FIG. 2), and an inverter box 51 are installed above the air-cooled condenser 4. Further, the inverter box 51 is provided so as to substantially contact the wall surface of the duct 50 formed along the shape of the inner partition plate 14a. A heat sink 52 indicated by a broken line is housed in the duct 50.

Each device installed in the condenser section S1 is partially covered by the outer plate 11 except for the condenser fan 6, the control box 10, the lower part of the air-cooled condenser 4, and the like. Since there is no outer plate 11 in the lower part of the air-cooled condenser 4,
The outside of the air-cooled condenser 4 is allowed to circulate outside air. In addition, the outer plate 11 is formed with a hole portion 11a corresponding to the outside air introduction port 50a which is one end of the duct 50.

As shown in FIG. 2, the inner partition wall 1 is provided behind (upper in the figure) the condenser section S1.
4a and the outer partition wall 14b have a blow-out air passage 15 formed therein, and low-temperature air flowing through an evaporator (not shown) (see FIG. 4) flows therethrough. The duct 50 is connected to the outside air from the outside air introduction port 50a near the outside plate 11,
An exhaust port 50b located near the condenser fan 6 is formed along the inner partition plate 14a. Duct 50
An inverter box 51 is attached to the wall surface of the inverter box 51 so as to be in close contact therewith, and a heat sink 52 attached to the inverter box 51 is accommodated in the duct 50. The heat sink 52 is the inverter box 51.
It is joined to the inverter related parts inside.

Refrigerating device 2 for container equipped with inverter
The operation of will be described. The refrigerant gas discharged from the compressor 3 enters the air cooling condenser 4 and / or the water cooling condenser 5 and is condensed and liquefied. The liquid refrigerant obtained by the condensation and liquefaction enters the electronic expansion valve 8 through the dryer 13 and the strainer 12, and is throttled here to be adiabatically expanded to become a gas-liquid two-phase refrigerant. This refrigerant enters an evaporator (not shown), where it cools the air in the inside S to evaporate and vaporize. Then, the evaporated and vaporized refrigerant (that is, the gas refrigerant) returns to the compressor 3 via the accumulator 9.

When heat exchange is performed between the refrigerant and the outside air by using the air-cooled condenser 4, the condenser fan 6 is rotationally driven to suck the outside air from below the air-cooled condenser 4 and let the outside air flow through the air-cooled condenser 4. . As a result, heat exchange is performed between the refrigerant and the outside air, and the outside air discharged above the air-cooled condenser 4 is exhausted toward the front side in FIG. 1 by the exhaust action of the condenser fan 6. In this way, the suction action and the exhaust action of the outside air by the condenser fan 6 are due to the outer plate 11 being attached to the periphery of the condenser fan 6 and the lower side of the air-cooling condenser 4 to form the air circulation path. Is.

At the exhaust port 50b of the duct 50 located near the condenser fan 6, the suction action of the condenser fan 6 works to suck the air in the duct 50. Then,
Since the inside of the duct 50 has a negative pressure, the outside air introduction port 5 formed at the end opposite to the exhaust port 50b as indicated by the solid arrow.
The outside air is taken in from 0a and flows in the duct 50.
Since the heat sink 52 is provided in the middle of the duct 50, the outside air flowing in the duct 50 is not exposed to the heat sink 5.
2 to pass the heat of the heat sink 52 and flow toward the condenser fan 6 on the downstream side. The outside air that has taken away heat from the heat sink 52 is exhausted from the condenser section S1 to the outside of the container 1 by the exhaust action of the condenser fan 6.

The heat of the heat sink 52 is taken away by the outside air flowing in the duct 50, so that the heat sink 52
The heat of the inverter-related parts in the inverter box 51 that is joined with the heat is taken away. As a result, the inverter-related parts and the inverter box 51 are cooled.

The operation of the container refrigeration system 2 is as follows.
It is controlled using an inverter, and the refrigerating capacity is adjusted according to the cooling condition inside the container 1. The heat generated from the inverter is effectively radiated by the heat radiating means, and the inverter operates at a temperature sufficiently lower than the heat resistant temperature.

According to this embodiment, the following effects are obtained. Even though the heat sink 52 is located above the air-cooled condenser 4, the temperature of the air flowing through the heat sink 52 is almost the same as the temperature of the outside air, so that effective cooling of the heat sink 52, that is, the inverter. Cooling is performed. Further, the heat sink can be forcibly cooled by the suction action of the outside air by the condenser fan 6, and the shape and volume of the heat sink can be made small. Since the heat sink 52 is small, the capacitor section S which is narrow together with the inverter box 51
It can be attached to 1. As a result of the above, it is possible to provide an inverter-controlled container refrigeration system that ensures the reliability of the inverter.

As a modified example of this embodiment, the structure described below may be adopted. The heat sink 52 of the present embodiment is housed in the duct 50 along the inner partition wall 14a forming the recess of the condenser section S2, and has a forced cooling structure by the condenser fan 6. Duct 50
Can most effectively generate the circulation of air by the condenser fan 6, and the flow velocity in the duct 50 can be adjusted by changing the shape. For example, by forming the cross-sectional area of the outside air inlet 50a larger than the cross-sectional area of the duct 50 in which the heat sink 52 is housed, it is possible to increase the flow velocity of the air near the heat sink 52 and further improve heat dissipation. By doing so, the heat sink 52 can be formed in a small size.

Although the heat sink 52 is housed in the duct 50, the present invention is not limited to this, and the same effect can be obtained by changing the shape or arrangement of the inverter box 51. . For example, a plate may be installed in the inverter box 51 to guide the rectification and air guide action by the plate. Similarly, inverter box 5
By the shape of No. 1, a circulation path of outside air may be formed around this. According to this, the wall surface of the inverter box 51 promotes the same action as the duct 50 described above, the inflow of the outside air by the condenser fan 6 is promoted, and the heat sink 52 can be cooled efficiently.

As yet another configuration, the heat sink 52
The heat dissipating means including the above may be configured to project from the inner partition plate 14a forming the capacitor section S1 to the blowout air passage 15 on the inside S side. That is, the heat radiation means is housed in the blowout air passage 15. According to this, the heat generated from the inverter-related components is transferred to the heat radiating means and exchanged with the cool air flowing through the evaporator. Since this cool air is the cooling air that is blown into the inside S of the container 1, the heat dissipation means can be made smaller. Since the heat radiating means may raise the temperature to some extent, it is desirable to install, for example, a blow-out temperature sensor or the like for operating control downstream of the heat radiating means. Of course, the heat radiating means may use a heat transfer member such as metal, or may be configured by circulating a fluid in a pipe or the like.

Although the present embodiment described above has a structure in which the inverter is cooled by using the heat sink 52 which is a heat radiating means, the present invention is not limited to this, and heat radiating means other than the heat sink 52 may be used. Further, by changing the shape and arrangement of the duct 50, for example, the outside air introduction port 50a may be arranged below the air cooling condenser 4,
It may be communicated with the blow-out air passage 15. According to this, installation of an inverter or the like can be appropriately coped with in a narrow space, and versatility is improved. Further, by connecting the duct 50 to the blowout air passage 15, a more effective heat sink 5 can be obtained.
It is possible to cool the heat dissipating means including 2.

Further, although the configuration has been described in which the condenser fan 6 cools in the course of air circulation, a separate fan may be provided to allow a large amount of air to flow through the heat radiating means. According to this, heat exchange in the heat radiating means is further promoted, stable performance can be expected even at high temperatures of the inverter, and the heat radiating means can be downsized.

Further, in the present embodiment, the condenser fan 6
Has described the configuration in which the air in the condenser section S1 is exhausted to the outside, but it is of course applicable to the case where the condenser fan 6 has a structure in which the outside air is blown to the air-cooled condenser 4. That is, this is the case where the outside air is introduced by the condenser fan 6, and the inflowing air is exhausted after passing through the air-cooling condenser 4. The inverter is cooled by the condenser fan 6 through the heat radiating means into the outside air. Further, by forming the duct 50 and the like,
The amount of air flowing through the heat radiating means is increased, and the cooling effect can be improved.

[0051]

The container refrigerating apparatus of the present invention described above has the following effects. According to the first aspect of the present invention, since the heat dissipation means attached to the inverter is provided in the outside air circulation path of the condenser fan, the heat dissipation means is forcibly cooled by the air flow generated by the condenser fan, and the heat dissipation of the inverter is effective. Can be done.

According to the second aspect of the present invention, since the fan forcibly ventilating the air is provided in the air circulation path of the condenser fan, the heat exchange in the heat radiating means is promoted and the heat radiating means can be miniaturized. It is possible to secure stable performance even under the condition that is exposed to high temperature.

According to the third aspect of the invention, since the heat dissipating means is housed in the duct forming a part of the flow path, the heat dissipating means can be cooled at the outside air temperature, and the flow velocity flowing through the heat dissipating means can be increased. As a result, the heat dissipation means can be downsized and the inverter can be installed in a narrow space.

According to the fourth aspect of the invention, since one end of the duct is provided so as to open in the vicinity of the condenser fan, the suction action in the condenser fan is increased, the flow velocity of the air in the duct is increased, and the heat dissipation means is Heat dissipation improves,
It is possible to effectively cool the heat radiation means, that is, the inverter. Therefore, as miniaturization of the heat dissipation means is promoted, it is possible to install the inverter in a narrow space, and further, the heat resistance of the inverter is improved, and the container refrigeration system has improved operation reliability. A device can be provided.

According to the fifth aspect of the invention, since the heat radiation means is a heat sink, the cooling structure of the inverter can be constructed at a low cost, and heat can be effectively exchanged with the outside air.

According to the sixth aspect of the present invention, the inverter is provided with the heat radiating means, and the heat radiating means is provided so as to project into the blowout air passage. Therefore, heat exchange in the heat radiating means is further promoted, and the inverter is exposed to high temperatures. It is possible to provide a high-performance and highly-reliable container refrigerating apparatus, which has stable performance even in a conditioned state.

[Brief description of drawings]

FIG. 1 is a front view of a container refrigerating apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a front view of a conventional container refrigeration system.

4 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

1 container 2 Container refrigeration equipment 4 Air-cooled condenser (condenser) 6 condenser fan 11a hole 50 ducts 50a Outside air inlet 50b exhaust port 51 Inverter box (inverter) 52 Heat sink (heat dissipation means) S1 capacitor section

Claims (6)

[Claims] 1. A refrigeration system for a container, comprising: a condenser provided integrally with the container for exchanging heat with the outside air; a condenser fan for passing the outside air through the condenser; and an inverter for controlling the operating capacity. The container refrigerating apparatus, wherein the inverter includes a heat radiating means, and the heat radiating means is provided in a flow path of outside air which is made to flow by the condenser fan. 2. The refrigerating apparatus for containers according to claim 1, wherein the distribution path is provided with a fan for forcibly ventilating the air in the distribution path. 3. The container refrigerating apparatus according to claim 1, wherein the heat radiating means is housed in a duct forming a part of the distribution path. 4. The refrigerating apparatus for a container according to claim 3, wherein one end of the duct is provided so as to open near the condenser fan. 5. The refrigerating apparatus for containers according to claim 1, wherein the heat radiating means is a heat sink. 6. A refrigerating apparatus for a container, which is provided integrally with the container and includes a blow-out air passage for blowing air cooled by an evaporator into at least the inside of the container, and an inverter for controlling an operating capacity, wherein the inverter is provided. Is a heat-dissipating means, and the heat-dissipating means is provided so as to project into the blowout air passage.