JPH1047833A - Evaporator unit of refrigerating device for transportation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly flow cooling air toward the upper and lower parts of an evaporator and improve the heat exchanging efficiency in the evaporator by providing near to an inlet surface facing an intake air passage below an evaporator coil air guide vanes for guiding cooling air to the inlet surface. SOLUTION: A part of intake air 70 absorbed to an evaporator coil 3 from an intake air passage 90 by an evaporator fan 6 is forcedly guided to the lower part of the evaporator coil 3 by a plurality of air guide vanes 10 and passes through the evaporator coil 3. Other intake air 70 passes the end parts of the air guide vanes 10, flows along a bulkhead 2, is guided toward the central part and the upper part of the evaporator coil 3, and then flows down in the evaporator coil 3. The intake air 70 to the evaporator coil 3 undergoes heat exchange with a refrigerant and cooled during its flow in the evaporator coil 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporator unit for a transport refrigeration system having a movable freezer such as a land transportation refrigeration system.

[0002]

2. Description of the Related Art FIG. 3 shows an overall schematic configuration of a refrigeration unit for land transportation (hereinafter abbreviated as a refrigeration unit).

In FIG. 3, reference numeral 50 denotes a freezer, and an evaporator unit 1 is installed in an opening at the front of the freezer 50. The front of the unit 1 is an evaporator house 4.
Covered with 0. A freezer 5 on the back of the unit 1
The bulkhead 2 is disposed on the 0 side to form an intake air passage 90. Reference numeral 30 denotes a condensing unit installed below the freezer 50, and the condensing unit 30 and the evaporator unit 1 are connected by a refrigerant pipe (not shown).

FIG. 4 is a side view showing an evaporator unit 1 in a conventional refrigeration system and the vicinity of a mounting portion thereof. In FIG. 4, reference numeral 3 denotes an evaporator coil of the evaporator unit 1. Below the evaporator coil 3, a saucer-shaped drain pan 4 surrounding the lowermost portion of the coil 3 is provided. A plurality of fan motors 5 and an evaporator fan 6 directly connected to the plurality of fan motors 5 via a motor bracket 8 are provided in combination with a shroud 7 on the upper surface.

In the refrigerating apparatus, the high-pressure liquid refrigerant from the condensing unit 30 is pressure-fed to the evaporator unit 1 through a refrigerant pipe, and is sucked through the evaporator coil 3 in the process of flowing through the evaporator coil 3. It exchanges heat with the air 70, evaporates and evaporates, and is returned to the condensing unit 30 via the refrigerant pipe.

The intake air 70 introduced into the evaporator coil 3 is supplied by the evaporator fan 6 to the intake air formed by the bulkhead 2 disposed on the back of the evaporator unit 1 and the lower part of the front inner wall surface of the freezer 50. Through the passage 90, along the bulkhead 2,
In the process of being drawn into the evaporator coil 3 and passing through the evaporator coil 3, it is cooled by exchanging heat with the refrigerant flowing through the piping of the evaporator coil 3.

[0007] The coil outlet air 80 cooled by the evaporator coil 3 is blown into the freezer 50 by the evaporator fan 6 from the outlet 100 formed by the upper end of the bulkhead 2 and the front ceiling of the freezer 50. Is done. The air blown out from the air outlet 100 forms a cooling air flow indicated by an arrow in FIG. 3, cools the inside of the freezer 50, and is returned to the suction air passage 90.

[0008]

In the above-mentioned conventional refrigeration system, after cooling the inside of the freezer 50, the intake air to the evaporator coil 3 returned to the intake air passage 90 flows to the upper part of the evaporator coil 3. The air is sucked by the disposed evaporator fan 6 and flows through the evaporator coil 3. At this time, the wind speed distribution of the intake air 70 on the intake air inlet side of the evaporator coil 3 is inversely proportional to the distance from the evaporator fan 6. A biased wind speed distribution results. For this reason, the amount of air passing through the lower part of the evaporator coil 3 away from the evaporator fan 6 (the hatched portion indicated by Z in FIG. 4) is smaller than that of the upper part.

However, the evaporator coil 3 employed in the refrigerating apparatus is of a fin and tube type in which a refrigerant circuit is divided into a number of stages in the vertical direction. For this reason, in such an evaporator unit, as described above, when the intake air 70 of the evaporator coil 3 does not flow evenly in the coil, there is a problem that the heat exchange efficiency in the evaporator coil 3 deteriorates.

An object of the present invention is to provide a transport refrigeration system in which the cooling air is allowed to flow uniformly in the upper and lower directions of the evaporator coil to improve the heat exchange efficiency in the evaporator unit. .

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its gist is to provide an evaporator unit having an evaporator coil and an evaporator fan in a front opening of a freezer. In the transportation refrigeration apparatus provided with an intake air passage through which cooling air flows from the freezer below the evaporator coil, the cooling air is brought close to at least an inlet surface facing the intake air passage at a lower portion of the evaporator coil. An evaporator unit for a transport refrigeration system, characterized in that an air guide vane for guiding the inlet surface is provided.

According to the above means, a part of the cooling air sucked into the evaporator coil by the evaporator fan via the suction air passage formed below the evaporator coil is provided at the lower portion of the evaporator coil inlet surface. While being forcibly guided to the lower part of the evaporator coil along the air guide vane provided near the surface, the remaining air passes through the air passage between the air guide vane tip and the bulkhead, The evaporator coil is guided toward the central and upper entrance surfaces of the evaporator coil.

Thus, the cooling air from the freezer flows uniformly from all the inlet surfaces extending from the upper portion to the lower portion of the evaporator coil, and the inlet air velocity of the cooling air at all the inlet surfaces becomes uniform. The deviation of the air flow is eliminated, and the efficiency of heat exchange with the refrigerant is improved.

Further, the air guide vane may be formed integrally with the drain pan by extending a part of a wall surface of a plate-shaped drain pan provided below the evaporator coil upward. Are included in the specific means.

According to this means, the air guide vane is integrally formed by extending a part of the wall surface of the drain pan.
The installation of the air guide vane can be performed simply by attaching the drain pan, and the installation and removal of the air guide vane can be extremely easily performed. Further, since there is no need to separately manufacture the air guide vane, the number of parts is reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. 1, 2 and 3. FIG. FIG. 1 shows a side view of an evaporator unit according to a first embodiment of the present invention and a vicinity of a mounting portion thereof.

In FIG. 1, reference numeral 1 denotes an evaporator unit, which is attached to a front opening of a freezer 50 and is covered by an evaporator house 40. Reference numeral 3 denotes an evaporator coil of the evaporator unit 1. A drain pan 4 is disposed below the evaporator coil 3 so as to surround a lowermost portion of the coil 3. A plurality of fan motors 5 and an evaporator fan 6 directly connected thereto via a motor bracket 8 are provided in combination with a shroud 7.

The above configuration is the same as the conventional one shown in FIG.

Reference numeral 10 denotes an air guide vane fixed to a lower portion inside the evaporator coil 3 (on the side of the bulkhead 2).

Each of the plurality of air guide vanes 10 has a root portion, that is, a portion to be attached to the evaporator coil 3, forming a flat portion arranged substantially perpendicular to the intake air inlet surface 3 a of the evaporator coil 3, and a tip portion thereof. It is bent so as to face the inflow direction of the intake air 70 into the evaporator, and is formed so as to guide the air. In addition, the air guide vane 10 has a suction air inlet surface 3a at a lower portion of the evaporator coil 3 and a suction head formed by the suction air inlet surface 3a and the bulkhead 2 disposed opposite thereto. It is provided to protrude into the air passage 90.

In the refrigerating apparatus, a high-pressure liquid refrigerant from the condensing unit 30 shown in FIG. 3 is sent to the evaporator unit 1 through a refrigerant pipe under pressure.
In the process of flowing through the evaporator coil 3, heat is exchanged with the intake air 70 passing through the evaporator coil 3 to evaporate and return to the condensing unit 30 via the refrigerant pipe.

A part of the intake air 70 drawn into the evaporator coil 3 from the intake air passage 90 by the evaporator fan 6 is forcibly guided to a lower portion of the evaporator coil 3 by the plurality of air guide vanes 10. Then, it flows through the evaporator coil 3. On the other hand, the other intake air 70 passes through the front end of the air guide vane 10, flows along the bulkhead 2, and is guided toward the central portion and the upper portion of the evaporator coil 3, and then flows into the evaporator coil 3. Flow through. The intake air 70 to the evaporator coil 3 is
In the evaporator coil 3, it is cooled by exchanging heat with the refrigerant flowing in the pipe of the evaporator coil 3. The cooled outlet air 80 of the evaporator coil 3 is blown out from the outlet 100 into the freezer 50 by the evaporator fan 6.

FIG. 2 shows a second embodiment of the present invention. FIG. 2 is a partial side view showing a schematic configuration and an arrangement of the evaporator unit. In FIG.
The plurality of air guide vanes 10 are arranged in a pan-shaped drain pan 4 surrounding the lowermost portion of the evaporator coil 3.
Of the wall surfaces forming the above, the wall surface on the intake air inlet side of the evaporator coil 3 is extended upward to the lower portion of the evaporator coil 3, and an air guide portion having the same shape as the first embodiment is integrally formed on this surface. It is arranged so as to protrude into an intake air passage 90 formed by the intake air inlet surface 3a of the evaporator coil 3 and the bulkhead 2 disposed opposite thereto.

In the second embodiment, a part of the intake air 70 sucked into the evaporator coil 3 from the intake air passage 90 by the evaporator fan 6 is supplied to the evaporator coil 3 by the plurality of air guide vanes 10.
The evaporator coil 3
The other intake air 70 flows through the inside of the air guide vane 10, flows along the bulkhead 2, and flows through the central portion and the upper portion of the evaporator coil 3.

The intake air 70 of the evaporator coil
Is cooled by exchanging heat with the refrigerant flowing through the piping of the evaporator coil 3 in the process of flowing through the evaporator coil 3. Coil 3 cooled by evaporator coil 8
The outlet air 80 is blown out from the outlet 100 into the freezer 50 by the evaporator fan 6.

[0026]

The present invention is configured as described above.
According to the present invention, the cooling air to the evaporator coil sucked by the evaporator fan has a uniform wind speed distribution from the lower side to the upper side of the inlet surface of the evaporator coil, and the entire surface of the evaporator coil inlet surface is uniform. , A substantially uniform air volume passes through. Thereby, the whole area of the evaporator coil effectively exerts its function, and deterioration of the heat exchange efficiency is prevented.

According to the second aspect of the present invention, since the air guide vane is formed integrally with the drain pan, the number of parts can be reduced and the time for assembling the air guide vane is shortened.

[Brief description of the drawings]

FIG. 1 is a side view of an evaporator unit according to a first embodiment of the present invention and the vicinity of a mounting portion thereof.

FIG. 2 is a partial side view of an evaporator unit and a mounting portion thereof according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a refrigeration unit for land transportation.

FIG. 4 is a view corresponding to FIG. 1 showing a conventional refrigeration apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporator unit 2 Bulk head 3 Evaporator coil 4 Drain pan 6 Evaporator fan 10 Air guide vane 40 Evaporator house 50 Freezer 90 Inlet air passage

Claims (2)

[Claims] An evaporator unit having an evaporator coil and an evaporator fan is provided at a front opening of a freezer, and an intake air passage through which cooling air flows from the freezer is provided below the unit. In the evaporator coil, at least close to the inlet surface facing the lower intake air passage,
An evaporator unit for a transport refrigeration system, further comprising an air guide vane for guiding the cooling air to the inlet surface. 2. The air guide vane according to claim 1, wherein a part of a wall surface of a plate-shaped drain pan provided below the evaporator coil is extended upward to be integrally formed with the drain pan. Evaporator unit for transportation refrigeration equipment.