JPH0569537U - Refrigerator unit - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention uses a heat exchanger arranged in a V-shape that takes in air from the side and exhausts it from above, and the heat exchange rate becomes uneven in the upper and lower parts of the heat exchanger. It is an object of the present invention to provide a refrigerator unit capable of preventing heat generation and effectively exhibiting the capability of a heat exchanger. According to the present invention, a pair of condensers 5a, 5b arranged in a V shape and a blower 7 arranged above the condensers 5a, 5b are housed in a casing 2, A large number of plate fins 10 in which condensers 5a and 5b are vertically arranged and a heat exchange pipe 1 penetrating the plate fins 10.
1, a refrigerator unit 1 having an intake hole 12 on the surface of the casing 2 located on the side of the condensers 5a and 5b and an exhaust hole 13 on the upper surface of the casing 2 on which the blower 7 is located. In, the surface area of the heat exchange pipe 11 of the condensers 5 a and 5 b is increased on the side far from the blower 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an outdoor type refrigerator unit used or incorporated in a freezing / refrigerating showcase, an air conditioner, or the like.

[0002]

[Prior Art]

 Generally, a refrigerator unit of this type, particularly a refrigerator unit installed outdoors, has a heat exchange chamber in the upper part of a casing and a machine chamber in the lower part, as shown in, for example, Japanese Utility Model Publication No. 61-668. A pair of heat exchangers arranged in a V shape and a blower arranged above the heat exchangers are housed in the heat exchange chamber, and the heat exchangers are arranged in a vertical direction. It is composed of a large number of plate fins and a heat exchange pipe penetrating the plate fins, and an intake hole is provided on the casing surface located on the side of the heat exchanger, while an exhaust hole is provided on the upper surface of the casing where the blower is located. Further, a base plate is provided at the bottom of the machine room, and mechanical parts such as a compressor and a receiver tank are mounted on the base plate.

[0003]

[Problems to be solved by the device]

 However, according to the above-mentioned configuration, the number of passes and the number of U-shaped portions of the heat exchange pipes of each heat exchanger arranged in a V shape are formed with a uniform density with respect to the plate fin surface. The upper and lower sides of the heat exchanger are designed to have the same diameter and the same number. Therefore, when air is taken in from both sides of the V-shaped heat exchanger and exhausted from above, the heat exchanger is used. There was a problem that the heat exchange rate became uneven in the upper and lower parts of the heat exchanger due to excessive air flow in the upper part and insufficient air flow in the lower part, making it impossible to effectively utilize the capacity of the heat exchanger.

The present invention has been made in view of such a point, and even if the heat exchanger arranged in a V shape is inhaled from the side and exhausted from above, the heat exchange rate in the upper and lower portions of the heat exchanger is high. It is an object of the present invention to provide a refrigerator unit capable of preventing unevenness of heat and effectively utilizing the capability of a heat exchanger.

[0005]

[Means for Solving the Problems]

 According to the present invention, a pair of heat exchangers arranged in a V shape and a blower arranged above the heat exchangers are housed in a casing, and the heat exchangers are vertically arranged. It is composed of a number of plate fins and heat exchange pipes penetrating the plate fins, and an intake hole is provided on the casing surface located on the side of the heat exchanger, while an exhaust hole is provided on the upper surface of the casing where the blower is located. In the provided refrigerator unit, the surface area of the heat exchange pipe of the heat exchanger is increased on the side far from the blower.

[0006]

[Action]

 With the above configuration, the refrigerator unit of the present proposal reduces the number of passes and U-shaped portions of the heat exchange pipe of the heat exchanger in the upper part of the heat exchanger with a large amount of ventilation, and in the lower part of the heat exchanger with a small amount of ventilation. As a result, a uniform heat exchange rate can be obtained in the upper and lower parts of the heat exchanger, and even if heat is taken in from both sides of the V-shaped heat exchanger and exhausted from above, The entire surface of the heat exchanger can be effectively used and the heat exchanger can be effectively used.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 is a refrigerator unit. In this unit, a heat exchange chamber 3 is formed in an upper portion of a casing 2, and a machine chamber 4 is formed in a lower portion, and a pair of condensers 5a and 5b arranged in the heat exchange chamber 3 so as to face each other in a V shape, The machine room 4 is configured to house mechanical parts such as the compressor 6. A blower 7 is provided above the heat exchange chamber 3. Reference numeral 8 denotes a base plate provided at the bottom of the machine room 4, on which mechanical parts such as the compressor 6 and the receiver tank 9 are mounted. The mechanical parts and the condensers 5a and 5b are connected by piping to form a refrigeration cycle.

The condensers 5a and 5b are formed by a large number of plate fins 10 arranged in a vertical direction and a heat exchange pipe 11 penetrating the plate fins, and one surface of a casing located laterally of the condensers. While an intake hole 12 is provided in the casing 1, an exhaust hole 13 is provided in the upper surface of the casing 1 where the blower 7 is located.

As shown in FIG. 2, the condensers 5 a and 5 b are provided with inlet pipes 14 and 15 for dividing the cooling medium discharged from the compressor 6 into the condensers 5 a and 5 b, and an inlet side header 16. , 17, the first branch pipes A and G further branched from the header, the second branch pipes B and H, the third branch pipes C and I, the fourth branch pipes D and J, and the fifth branch pipe. The pipes E and K, the sixth flow dividing pipes F and L, the heat exchange pipes 11 penetrating the plate fins 10 through the respective flow dividing pipes, the U-shaped pipe portion 18 connecting these pipes, and the heat exchange pipes. 11 and outlet headers 19 and 20 for collecting the refrigerant flowing out of the U-shaped portion 18.

Here, as shown in FIG. 4, each heat exchange pipe 11 is formed such that the number of passes (the number of plates penetrating the plate fins 10) and the number of U-shaped pipes are different in three sections in the vertical position. ing. Since the condensers 5a and 5b have the same shape, the condenser 5a will be described.

That is, the number of passes is 10 for the first split stream A, the second split stream B, the number of passes for the third split stream C, the number of passes for the fourth split stream D are 12, the number of passes for the fifth split stream E, and the number of passes for the sixth split stream F are 14. The number of passes on the side far from the blower 7 is increased. The diameters (outer diameter, inner diameter) of the heat exchange pipe 11 are all the same.

On the other hand, the heat exchange amount Φ of the condensers 5a and 5b is expressed by the following equation.

Φ = Kn · An · Δtm (n = 1,2,3 ...) Kn: Heat transfer rate An: Surface area of heat exchange pipe Δtm: Temperature difference between suction and blowout In addition, heat transfer rate of each branch flow The relationship between Kn and the air side heat transfer coefficient αan depending on the suction wind speed is as follows.

1 / Kn = 1 / αan + 1 / αr αan: Air-side heat transfer coefficient (n = 1, 2, 3 ...) αr: Refrigerant-side heat transfer coefficient That is, in this embodiment, the first split flow A, the second The shunt B has 10 passes, the third shunt C has a number of passes 12, the fourth shunt D has a number of passes 12, the fifth shunt E has a number of passes 14 and the sixth shunt F has a number of passes 14 to increase the number of passes farther from the blower 7. Therefore, the amount of heat exchange in the upper part of the condenser 5a with a large amount of ventilation by the blower 7 and the amount of heat exchange in the lower part of the condenser 5b with a small amount of ventilation can be made substantially the same, and a V shape can be obtained. Even if the condensers 5a and 5b arranged are inhaled from the side and exhausted from the upper side, the entire surface of the condenser can be effectively used and the capacity of the condenser can be effectively exhibited.

Here, the heat exchange rate of each split stream is represented by the product of the suction area An (surface area of the heat exchange pipe) and the heat passage rate Kn in each split stream, as shown in FIG. Is equal for each shunt.

Although the number of passes of the heat exchange pipe 11 is changed in the present embodiment, the present invention is not limited to this, and the diameter of the heat exchange pipe 11 or the like may be changed. The same effect can be obtained as long as the surface area of V is changed according to the amount of ventilation.

[0018]

[Effect of the device]

 As described above, according to the present proposal, the number of passes and the number of U-shaped portions of the heat exchange pipes of the heat exchanger are reduced in the upper part of the heat exchanger with a large amount of ventilation and increased in the lower part of the heat exchanger with a small amount of ventilation. The heat exchange rate can be made uniform in the upper and lower parts of the heat exchanger, and heat exchange is possible even if the air is taken in from both sides of the V-shaped heat exchanger and exhausted from above. The entire surface of the vessel can be effectively used, and the capacity of the heat exchanger can be effectively exhibited.

[Brief description of drawings]

FIG. 1 is a side sectional view of a refrigerator unit.

FIG. 2 is a side view of a main part of a condenser.

FIG. 3 is an explanatory view of a main part of a condenser.

FIG. 4 is a table showing the number of passes in each branch of the condenser.

[Explanation of symbols]

 2 Casing 5a, 5b Condenser 6 Compressor 7 Blower 10 Plate fin 11 Heat exchange pipe 12 Intake hole 13 Exhaust hole

Claims (1)

[Scope of utility model registration request] 1. A heat exchanger arranged in a V shape and a blower arranged above the heat exchanger are housed in a casing, and the heat exchangers are arranged in a longitudinal direction. Of the plate fins and a heat exchange pipe penetrating the plate fins, and an intake hole is provided in the casing surface located on the side of the heat exchanger, while an exhaust hole is provided in the casing upper surface where the blower is located. In the refrigerator unit, the refrigerator unit is characterized in that the surface area of the heat exchange pipe of the heat exchanger is increased on the side far from the blower.