JPH11118199A - Air conditioner - Google Patents

Abstract

(57) [Summary] [Problem] In the case of a building outdoor unit, a ceiling suspended indoor unit, a ceiling cassette type indoor unit, etc., the front wind speed in the heat exchanger is reduced due to the structural positional relationship between the fan and the heat exchanger. There is a problem in that the heat exchange becomes uneven and a temperature difference occurs between the heat exchanger paths, so that sufficient heat exchange performance cannot be obtained. In order to achieve the above object, a plate fin tube heat exchanger is divided into two equal parts or more to change the fin pitch and the notch shape of the fin, or the fin shape is trapezoidal / triangular. Thus, the air pressure loss when passing through the heat exchanger is changed, and the flow of air between the heat exchanger and the fan is changed, so that the front wind speed of the plate fin tube heat exchanger is made uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-cooled heat exchanger used for an air conditioner and a refrigerator.

[0002]

2. Description of the Related Art Plate fins used in conventional plate fin tube heat exchangers are assembled with the same shape and pitch. Therefore, when the fan in the direction perpendicular to the plate fins of the plate fin tube heat exchanger is rotated to take in outside air and exchange heat with the refrigerant in the plate fin tube heat exchanger, the closer the fan becomes, the closer the heat exchanger becomes. The front wind speed of the heat exchanger increases, and the front wind speed of the heat exchanger decreases as the distance from the fan increases.

When the plate fin tube heat exchanger is mounted at an angle, the wind speed in front of the heat exchanger increases as the distance from the fan increases, and the wind speed decreases in front of the heat exchanger as the distance from the fan increases.

As an example of an air conditioner that takes in outside air by rotating a fan that is perpendicular to the plate fins of the plate fin tube heat exchanger and exchanges heat in the refrigerant in the plate fin tube heat exchanger, for example, There is an upper blowing outdoor unit described in Japanese Unexamined Patent Publication No. 3-179198.

Further, as an example of an air conditioner in which a plate fin tube heat exchanger is mounted at an angle,
For example, there is a ceiling-suspended indoor unit described in JP-A-5-164346.

[0006]

An outdoor unit for a building in which a propeller fan is arranged on the upper surface of a unit and blows air in a top flow direction, and a heat exchanger arranged in front of a sirocco fan are arranged at an angle more than the height limit of the product. In the case of a ceiling-suspended indoor unit or a ceiling cassette type indoor unit that does not evenly hit the heat exchanger due to the introduction of outside air by a turbo fan, the wind speed near the front of the heat exchanger increases as the fan gets closer. As the distance from the heat exchanger decreases, the front wind speed decreases, so that the wind passing through the heat exchanger becomes non-uniform, causing a problem that a temperature difference occurs between the heat exchanger paths.

That is, when the heat exchanger is viewed from an evaporator,
The place where the wind speed is fast is superheated, the heat exchange performance is reduced and the heat exchanger cannot be used effectively. In addition, a place where the wind speed is slow is moist, which causes a problem that heat exchange performance is deteriorated.

Further, when the heat exchanger is viewed as a condenser, where the wind speed is high, the condensation performance is good, a liquid pool is generated, and the refrigerant does not easily flow. On the other hand, where the wind speed is low, the condensation performance is poor, and the heat exchanger leaves the heat exchanger in a state of high dryness.

[0009] Further, while the refrigerant to be used is changed from the HCFC-based refrigerant to the HFC-based refrigerant, there is a problem that the performance is lowered at the same point of use as the conventional refrigerant due to the change of the refrigerant.
For this reason, it is necessary to quickly take technical measures to maximize the performance of the heat exchanger.

[0010] An object of the present invention is to solve the above-mentioned problems and improve the efficiency and size of the heat exchanger, thereby connecting the heat exchanger and the expansion valve sequentially to form a refrigeration cycle component and a motor. An object of the present invention is to reduce the size of an air conditioner in which a blower for a fan, a bellmouth, and the like are arranged in a housing.

[0011]

Means for Solving the Problems The refrigerant circulating in the refrigeration cycle is an HFC system, and a refrigeration cycle component constituting a refrigeration cycle by sequentially connecting a heat exchanger and an expansion valve, and a blower for a motor, a fan and a bell mouth are provided. The heat exchanger had a plate fin tube structure, and the plate fins were divided into two parts so that the pitch between the plate fins was different.

[0012]

Embodiments of the present invention will be described below.

FIG. 1 shows a compressor 1, a four-way valve 2, an outdoor unit heat exchanger 3, an L tank 4, an expansion valve 5, an indoor unit heat exchanger 6, and an accumulator 7, which are sequentially connected, and an HFC-based refrigerant is used. The refrigeration cycle system diagram is shown.

At the time of cooling, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 is cooled and condensed by the air sent by the outdoor unit fan 8 in the outdoor unit heat exchanger 3 through the four-way valve 2 so that the high pressure gas refrigerant is compressed. Changes to liquid refrigerant. The liquid refrigerant accumulates in the L tank 4, and a part or all of the refrigerant is sent to the indoor unit, adiabatically expanded by the expansion valve 5, turns into a low-temperature low-pressure gas refrigerant, evaporates in the indoor unit heat exchanger 6, The heat is taken from the air sent by the fan 9 and returns to the indoor unit again. The low-pressure gas refrigerant is gas-liquid separated by the accumulator 7 via the four-way valve 2, and only the refrigerant gas is sucked into the compressor 1 and compressed again.

At the time of heating, the four-way valve 2 is switched and the flow of the refrigerant is the reverse of the above flow. That is, the gas refrigerant compressed to a high temperature and a high pressure by the compressor 1 passes through the four-way valve 2 through the indoor unit heat exchanger 6.
Is cooled and condensed by the air sent by the indoor unit fan 9 to change into a high-pressure liquid refrigerant. The liquid refrigerant is adiabatically expanded by the expansion valve 5, becomes a low-temperature low-pressure gas refrigerant, evaporates in the outdoor unit heat exchanger 3, takes away heat from the air sent by the outdoor unit fan 8, and the low-pressure gas refrigerant passes through the four-way valve 2. The gas is separated into gas and liquid by the accumulator 7, and only the refrigerant gas is sucked into the compressor 1 and compressed again.

As described above, in the outdoor unit heat exchanger 3, the refrigerant is condensed during cooling, and the refrigerant evaporates during heating.

FIG. 2 shows a detailed view of the heat exchanger. Normally, the air is uniformly blown by the heat exchanger, and the refrigerant condenses and evaporates in each of the plurality of divided paths, merges again, and circulates in the refrigeration cycle. For this reason, in order to maximize the performance of the heat exchanger, it is necessary that the refrigerant divided into a plurality of paths is evenly distributed by the desbye, and the wind is evenly applied to each path.

FIG. 3 shows an example of an outdoor unit for air conditioning in which a heat exchanger is arranged on a saw base 14, and a blower such as a fan motor 10, an outdoor unit fan 8, a motor clamp 11 and the like are arranged in an upper part of the unit.

Outdoor units, such as building outdoor units, which are limited in installation space, are installed horizontally in a row, and therefore often employ a cabinet configuration that blows air in the top flow direction.

In this case, the wind of the propeller fan blows out of the housing in the vertical direction, while the wind sucked into the heat exchanger is in the horizontal direction. Also, due to the relationship between the propeller fan and the heat exchanger, the wind that hits the heat exchanger becomes stronger as it moves from the path closer to the propeller fan to the path farther away, and the surface wind speed in the vertical direction of the heat exchanger becomes lower. Become uniform.

In the heating operation in which the heat exchanger is used as an evaporator, since the wind speed is high in the path above the heat exchanger, superheated gas is generated at the evaporator outlet. On the other hand, the lower path has low evaporation speed due to low wind speed, passes through the heat exchanger with the saturated gas wet, and the temperature or heat exchange performance between the paths in the vertical direction of the heat exchanger becomes uneven.

When the heat exchanger is used as a condenser, since the wind speed is high in the path above the heat exchanger, the refrigerant becomes a supercooled liquid refrigerant from the saturated gas, and the liquid refrigerant accumulates in the heat exchanger. Put in. In addition, since the wind speed is slow at the lower part of the heat exchanger, the condensation performance is poor, and the condensation from the high-temperature and high-pressure gas passes through the heat exchanger as a dry saturated gas while the condensation is incomplete. The temperature or heat exchange performance between passes becomes uneven.

For this reason, the present invention makes it possible to reduce the temperature difference between the paths in the vertical direction of the heat exchanger by equalizing the wind speed in front of the heat exchanger in the vertical direction. In other words, the surface wind speed of the upper heat exchanger 12 close to the propeller fan is received by the narrow path of the heat exchange fin pitch to reduce the air pressure loss in the heat exchanger, and the lower heat exchanger 1 remote from the propeller fan.
(3) The flow of the wind that hits the heat exchanger so that the frontal wind speed in the heat exchanger is uniform in the vertical direction of the heat exchanger by increasing the air pressure loss in the heat exchanger by receiving the surface wind speed in the path with a wide heat exchange fin pitch Is made uniform.

According to this effect, the wind speed is made uniform between the heat exchanger passes, the temperature difference between the heat exchange passes is reduced, and the heat exchange performance can be maximized.

FIG. 4 shows an example of an air-conditioning outdoor unit in which a heat exchanger is disposed on a saw base 14, and a blower such as a fan motor 10, an outdoor unit fan 8, and a motor clamp 11 is disposed in an upper portion of the unit. The heat exchanger is further divided into two parts, and the surface wind speed of the upper heat exchanger 12 close to the propeller fan is received by a narrow path of the heat exchange fin pitch to reduce air pressure loss in the heat exchanger, and the lower heat exchange far from the propeller fan. Vessel 1
3) The wind flow hitting the heat exchanger so that the front wind speed at the heat exchanger is uniform in the vertical direction of the heat exchanger by increasing the air pressure loss in the heat exchanger Is made uniform.

According to this effect, the wind speed is made more uniform between the heat exchanger paths, the temperature difference between the heat exchange paths is reduced, and the heat exchange performance is maximized, as compared with the heat exchanger of FIG. It is possible to do.

FIG. 5 shows an example of an air-conditioning outdoor unit in which a heat exchanger is disposed on a saw base 14, and a blower such as a fan motor 10, an outdoor unit fan 8, and a motor clamp 11 is disposed in an upper portion of the unit. The trapezoidal heat exchanger 15 having a trapezoidal plate fin shape receives the wind speed of the path close to the propeller fan on the wide side of the heat exchange fin and the wind speed of the path far from the propeller fan to the narrow side of the heat exchange fin. In order to equalize the air pressure loss in the heat exchanger in the vertical direction of heat exchange, the surface wind speed is slower toward the upper part and faster toward the lower part. The wind speed is made uniform. With this effect, the wind speed is made uniform between the heat exchanger paths, the temperature difference between the heat exchange paths is reduced, and the heat exchange performance can be maximized.

FIG. 6 shows an example of an air-conditioning outdoor unit in which a heat exchanger is disposed on a saw base 14, and a blower such as a fan motor 10, an outdoor unit fan 8, and a motor clamp 11 are disposed in an upper portion of the unit. The triangular heat exchanger 16 having a triangular plate fin shape receives the wind speed of the path close to the propeller fan on the wide side of the heat exchange fin and the wind velocity of the path far from the propeller fan to the narrow side of the heat exchange fin. In order to equalize the air pressure loss in the heat exchanger in the vertical direction of heat exchange, the surface wind speed is slower toward the upper part and faster toward the lower part. The wind speed is made uniform. By this effect, the wind speed is made uniform between the heat exchanger paths as compared with the heat exchanger of FIG.
The temperature difference between the heat exchange paths is reduced, and the heat exchange performance can be maximized.

FIG. 7 shows an example of an outdoor unit for air conditioning in which a heat exchanger is arranged on a saw base 14 and a blower such as a fan motor 10, an outdoor unit fan 8, a motor clamp 11 and the like are arranged in an upper part of the unit. The wind speed of the pass close to the propeller fan is received by the fin with a high height as shown in Fig. 9,
The wind speed of the path far from the propeller fan is received by the path with a low fin height as shown in Fig. 10, and the front wind speed is set to the upper part in order to equalize the air pressure loss in the heat exchanger in the vertical direction of heat exchange. By making it slower and faster at the lower part, the wind speed at the front of the heat exchanger is made uniform.

By this effect, the wind speed is made uniform between the heat exchanger passes, the temperature difference between the heat exchange passes is reduced, and the heat exchange performance can be maximized.

FIG. 8 shows an example of an air-conditioning outdoor unit in which a heat exchanger is disposed on a saw base 14, and a blower such as a fan motor 10, an outdoor unit fan 8, and a motor clamp 11 are disposed in an upper portion of the unit. The heat exchanger of FIG. 7 is further subdivided from the two parts, and the wind speed of the path close to the propeller fan is received by the path with a high fin height as shown in FIG. 9 and the wind speed of the path far from the propeller fan is FIG. In order to equalize the air pressure loss in the heat exchanger in the vertical direction of heat exchange, the front wind speed is slower toward the top and faster toward the bottom in order to equalize the air pressure loss in the heat exchanger By doing so, the wind speed at the front of the heat exchanger is made uniform.

According to this effect, the wind speed is made uniform between the heat exchanger paths, the temperature difference between the heat exchange paths is reduced, and the heat exchange performance is maximized as compared with the heat exchanger of FIG. It is possible to do.

That is, the pressure loss h of the diameter d, the length L, and the average speed v is given by

[0034]

(Equation 1)

## EQU2 ## Here, assuming that the volume flow rate passing through the heat exchanger is Q (m ³ / S),

[0036]

(Equation 2)

Is as follows. That is, the pressure loss is inversely proportional to the fifth power of the diameter and is proportional to the length. Therefore, the present invention provides a refrigeration cycle component that sequentially connects a heat exchanger and an expansion valve to form a refrigeration cycle, and a motor, a fan, and an air conditioner that disposes a blower of a bell mouth in a housing. The plate fin tube structure is adopted, the plate fin is divided into two parts, the fin pitch at the place where the wind speed is fast is narrowed, the passage area is narrowed and the ventilation resistance is increased, so that the front wind speed is slowed and the front face of the heat exchanger is reduced. The wind speed can be made uniform.

Further, the present invention relates to an air conditioner in which a refrigeration cycle component which sequentially connects a heat exchanger and an expansion valve to constitute a refrigeration cycle, and an air conditioner in which a motor, a fan and a bell mouth blower are disposed in a housing. The exchanger adopts a plate fin tube structure, the plate fin is divided into a plurality of parts, and the pitch between the fins of each plate fin is changed. It is possible to make the heat exchanger more subdivided and to make the front wind speed of the heat exchanger more uniform than the above heat exchanger.

Further, the present invention provides a refrigeration cycle component which sequentially connects a heat exchanger and an expansion valve to constitute a refrigeration cycle,
In an air conditioner in which a motor, a fan, and a bell mouth blower are arranged in a housing, when the heat exchanger has a plate fin tube structure and the plate fin shape is trapezoidal, the pressure loss is reduced by the length of the fin. By proportionally increasing the length of the fin where the wind speed is fast and increasing the ventilation resistance, the front wind speed can be reduced and the front wind speed of the heat exchanger can be made uniform.

Further, the present invention provides a refrigeration cycle component which sequentially connects a heat exchanger and an expansion valve to form a refrigeration cycle,
In an air conditioner in which a motor, a fan, and a bell mouth blower are arranged in a housing, the heat exchanger adopts a plate fin tube structure and the plate fin shape is triangular, so that fins with high wind speed can be removed. By increasing the length and increasing the ventilation resistance, the front wind speed can be reduced and the front wind speed of the heat exchanger can be made uniform.

Further, the present invention provides a refrigeration cycle component which sequentially connects a heat exchanger and an expansion valve to constitute a refrigeration cycle,
2. Description of the Related Art In an air conditioner in which a motor, a fan, and a bell mouth blower are arranged in a housing, a heat exchanger adopts a plate fin tube structure, and a plate fin is divided into two parts, and a height of the plate fin at a high wind speed is increased. By increasing the height, the frontal wind speed can be reduced by reducing the passage area and increasing the ventilation resistance, thereby making the frontal wind speed of the heat exchanger uniform.

Further, the present invention provides a refrigeration cycle component which sequentially connects a heat exchanger and an expansion valve to constitute a refrigeration cycle,
In an air conditioner in which a motor, a fan, and a bell mouth blower are arranged in a housing, a heat exchanger adopts a plate fin tube structure and is divided into a plurality of plate fins, and the cut-and-raised height of each plate fin is increased. By changing the fins, the ventilation resistance can be further subdivided as compared with the case where the fin is divided into two, and the front wind speed of the heat exchanger can be made more uniform than that of the heat exchanger.

The present invention is characterized in that the plate fin is divided into a plurality of fins, and the plate fins have different pitches between the fins.

Further, the plate fins are trapezoidal in shape. Still further, the plate fins have a triangular shape. Further, the plate fin is divided into two parts, and the cut-and-raised height of each plate fin is changed. Furthermore, the plate fin is divided into a plurality of plate fins, and the cut-and-raised height of each plate fin is changed.

[0045]

According to the present invention, in an air conditioner provided with a plate fin tube heat exchanger, the surface wind speed on the front surface of the heat exchanger is made uniform regardless of the installation position of a fan for introducing outside air. Thus, the efficiency of the plate fin heat exchanger can be increased, and the cooling and heating capacity of the air conditioner can be improved.

Further, since the temperature difference between the paths of the heat exchanger can be made uniform, when the heat exchanger is used as an evaporator at the time of heating, the path having a low wind speed is liable to frost, and defrosting is performed. The problem that the frequency increases can be avoided, and the comfort of the air conditioner can be improved.

[Brief description of the drawings]

FIG. 1 shows an example of a refrigeration cycle.

FIG. 2 shows an example of a heat exchanger.

FIG. 3 is a side view showing a main part of the outdoor unit according to the embodiment.

FIG. 4 is a side view showing a main part of the outdoor unit according to the embodiment.

FIG. 5 is a side view showing a main part of the outdoor unit according to the embodiment.

FIG. 6 is a side view showing a main part of the outdoor unit according to the embodiment.

FIG. 7 is a side view showing a main part of the outdoor unit according to the embodiment.

FIG. 8 is a side view showing a main part of the outdoor unit according to the embodiment.

FIG. 9 shows an example of a fin according to one embodiment.

FIG. 10 is a sectional view taken along line AA of FIG. 9;

FIG. 11 shows an example of a fin according to an embodiment.

FIG. 12 is a sectional view taken along line AA of FIG. 11;

[Explanation of symbols]

1 ... Compressor, 2 ... Four-way valve, 3 ... Outdoor unit heat exchanger, 4 ... L
Tank, 5: expansion valve, 6: indoor unit heat exchanger, 7: accumulator, 8: outdoor unit fan, 9: indoor unit fan, 1
0: Fan motor, 11: Motor clamp, 12: Upper heat exchanger, 13: Lower heat exchanger, 14: Soko base, 1
5 ... trapezoidal heat exchanger, 16 ... triangular heat exchanger,

Claims (1)

[Claims] 1. A refrigerant circulating in a refrigeration cycle is an HFC system, and a refrigeration cycle component constituting a refrigeration cycle by sequentially connecting a heat exchanger and an expansion valve, and a blower for a motor, a fan and a bell mouth are arranged in a housing. The heat exchanger has a plate fin tube structure, and the plate fins are
An air conditioner, wherein the air conditioner is divided and the plate fins have different pitches between the fins.