JPH08152292A - Heat exchanger - Google Patents

Abstract

PURPOSE: To eliminate deterioration of the performance of an aircraft when a heat exchanger is used for the condenser of the air conditioner of the aircraft by so forming a channel area of a refrigerant side as to be altered in the exchanger having a heat transfer unit between a refrigerant channel and a refrigerant cooling fluid channel. CONSTITUTION: A heat exchanger 1 comprises a core 2 for heat exchanging, an inlet 3 for introducing refrigerant to the core 2, a case 4 for covering the core 2 and the inlet 3, and a partition plate 5 for partitioning the core 2 side and the inlet 3 side. The core 2 has a plurality of refrigerant channels 6a to 6e and refrigerant cooling air channels 7a to 7f. The inlet 3 has a cylindrical tube 11, and a columnar moving unit 15 is so engaged with the tube 11 as to be axially movable. The unit 15 is moved via a rack 16 by the rotation of a pinion 17 by a motor 18, thereby selectively closing the inlets 13a to 13e, and the channel area of the refrigerant side of the core 2 is altered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and is suitable for use in a condenser of an air conditioner for an aircraft to perform heat exchange of a refrigerant.

[0002]

2. Description of the Related Art A conventional aircraft air conditioner 10 shown in FIG.
1 is a condenser 102, a liquid receiver 103, an antifreeze dryer 104, a filter 105, and an expansion valve 106.
The evaporator 107 and the compressor 108 form a refrigeration cycle. In addition, the fan 10 that sends the cooling air to the condenser 102 when stationary on the ground
9 and a fan 110 for sending the conditioned air from the evaporator 107 into the machine. The arrow in the figure indicates the direction of air flow.

In response to signals from the pressure switches 111 and 112 arranged upstream and downstream of the compressor 108,
Shutter 11 arranged in the passage for the cooling air
A control device 115 for controlling the opening degree of No. 4 is provided.
That is, in winter or at high altitude, the capacitor 10
When the temperature of the cooling air for cooling medium sent to 2 is lowered, the pressure of the cooling medium is drastically reduced and the liquefaction of the cooling medium in the expansion valve 106 is hindered.
The opening of 14 is made small, the air volume of the refrigerant cooling air is made small, and the heat exchange amount is made small.

The controller 115 responds to the signals from the temperature sensor 113 of the conditioned air, the on / off signal of the air conditioning and the temperature setting signal from the operation panel (not shown), and the fans 109, 1 respectively.
10 and the drive motor 118 of the compressor 108 are controlled to be turned on and off, and the opening and closing valves 116 and 117 and the expansion valve 106 of the bypass passage are controlled at the time of startup, so that the evaporator 107 is appropriately liquefied refrigerant. Send in.

[0005]

SUMMARY OF THE INVENTION In the above conventional configuration,
Since the amount of heat exchange is reduced by reducing the opening of the shutter 114, there is a problem that the air resistance increases and the performance of the aircraft deteriorates. Also, shutter 1
Providing 14 increases the weight and space for placement, and the increased weight reduces the performance of the aircraft. It is also possible to prevent the refrigerant pressure from dropping extremely by making the rotation speed of the compressor 108 variable,
Since an inverter or the like is required to change the rotation speed of the compressor 108, the weight increases and the performance of the aircraft also deteriorates.

An object of the present invention is to provide a heat exchanger which can solve the above problems.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, a coolant passage, a fluid passage for cooling the coolant, and a heat transfer section interposed between the coolant passage and the coolant cooling passage. In the heat exchanger provided with, the flow passage area on the refrigerant side can be changed.

[0008]

According to the heat exchanger of the present invention,
The heat exchange area can be changed by changing the flow passage area on the refrigerant side, and the heat exchange amount can be changed without changing the flow rate of the refrigerant cooling fluid in the refrigerant cooling fluid passage. As a result, when the heat exchanger is used as a condenser of an air conditioner of an aircraft, it is possible to prevent the performance of the aircraft from being deteriorated, and a shutter for changing the air volume of the cooling air for the refrigerant is not required, and the weight and the weight of the air can be reduced. The space for placement can be reduced and the performance of the aircraft can be prevented from being degraded.

[0009]

1 is a front sectional view of a heat exchanger 1 according to an embodiment of the present invention, FIG. 2 is a plan sectional view of the heat exchanger 1, and FIG. FIG. The heat exchanger 1 shown in FIGS. 1 to 3 is used for a condenser of an air conditioner of an aircraft and used for heat exchange of a refrigerant. The air conditioner may have a configuration in which the shutter 114 is removed from the air conditioner 101 shown in the conventional example.

In FIG. 1, a heat exchanger 1 comprises a core 2 for exchanging heat and an introducing portion 3 for introducing a refrigerant into the core 2.
A case 4 for covering the core 2 and the introduction portion 3, and a core 2
And a partition plate 5 on the introduction section 3 side.

The core 2 has five refrigerant flow paths 6a, 6
b, 6c, 6d, 6e and six refrigerant cooling air passages 7
a, 7b, 7c, 7d, 7e, 7f. In the present embodiment, the refrigerant flow path 6 is provided between the pair of parallel heat transfer plates (heat transfer parts) 8 attached to the case 4.
a, 6b, 6c, 6d, 6e, and each refrigerant flow path 6
a, 6b, 6c, 6d, and 6e, each of which is adjacent to each other via the heat transfer plate 8 has a cooling air passage 7a, 7b, 7
c, 7d, 7e and 7f. As shown in FIG.
The inlets of the respective refrigerant channels 6a, 6b, 6c, 6d, 6e are openings 5a, 5b, 5c, 5 formed in the partition plate 5.
It is connected to the introduction part 3 via d and 5e, and the outlet is connected to the expansion valve side. As shown in FIG. 1, both ends of each refrigerant cooling air passage 7a, 7b, 7c, 7d, 7e, 7f are open to the outside air. In addition, each of the cooling air passages 7a, 7
Fins 7'are arranged on b, 7c, 7d, 7e and 7f. The flow direction of the refrigerant indicated by the solid line arrows in the respective refrigerant passages 6a, 6b, 6c, 6d, 6e and the refrigerant cooling air in the respective refrigerant cooling air passages 7a, 7b, 7c, 7d, 7e, 7f. The flow direction shown by the broken line arrow in the drawing is a right angle in the drawing, but the flow direction is not limited to this.

As shown in FIG. 3, the introduction part 3 has a cylindrical tube 11 contained in the case 4, and one end of the tube 11 is connected to a transfer duct 12 for the refrigerant sent from the compressor. The other end is closed. As shown in FIGS. 1 and 2, the tube 11 has five slit-shaped refrigerant introduction ports 13a, 13b, 13c, 13 along the circumferential direction.
d and 13e pass through the openings 5a, 5b, 5c, 5d, and 5e formed in the partition plate 5, and the respective refrigerant flow paths 6a,
It is formed at a position facing the entrances of 6b, 6c, 6d and 6e. As a result, the refrigerant introduced into the tube 11 through the transport duct 12 is cooled by the refrigerant introduction ports 13a, 13b, 13c, 1 of the tube 11 as indicated by arrows in the figure.
3d, 13e to the respective refrigerant flow paths 6a, 6b, 6c, 6d,
6e is introduced. In addition, each refrigerant flow path 6a, 6b, 6
Four positions between the openings 5a, 5b, 5c, 5d, and 5e formed in the partition plate 5 so that the c, 6d, and 6e do not communicate with each other through the outer circumference of the tube 11 and the inner circumference of the case 4. In, the shielding plates 30a, 30b, 30c, 30 extending between the outer circumference of the tube 11 and the inner circumference of the case 4
d is provided.

As shown in FIGS. 1 to 3, a cylindrical moving body 15 is inserted into the tube 11 so as to be movable in the axial direction. The gap between the inner circumference of the tube 11 and the outer circumference of the moving body 15 has a size small enough to prevent the flow of the refrigerant. A rack 16 having an axis line along the axial direction of the moving body 15 is attached to the moving body 15, and a pinion 17 meshing with the rack 16 is attached to an output shaft of a motor 18 attached to the tube 11. The rotation of the pinion 17 driven by the motor 18 is transmitted to the rack 16 so that the moving body 15 moves in the tube 11 in the axial direction. By the movement of the moving body 15, for example, the refrigerant introduction port 13e at the farthest position from the transfer duct 12 and the refrigerant introduction port 13d adjacent to the refrigerant introduction port 13e are selectively opened and closed, and the refrigerant introduction ports 13d, It is possible to block the introduction of the refrigerant into both or one of the refrigerant channels 6d and 6e corresponding to 13e. In this way, by driving the moving body 15, the flow passage area on the refrigerant side in the core 2 is changed.

According to the above heat exchanger 1, the heat exchange area is changed by changing the flow passage area on the refrigerant side in the core 2, and the refrigerant cooling air flow passages 7a, 7b, 7c, 7d, 7 are provided.
The heat exchange amount can be changed without changing the air amount of the refrigerant cooling air in e and 7f. As a result, when the heat exchanger 1 is used as a condenser of an air conditioner of an aircraft, it is possible to prevent the performance of the aircraft from deteriorating. Further, a shutter for changing the amount of air for cooling the refrigerant is not required, the weight and space for arrangement can be reduced, and the performance of the aircraft can be prevented from deteriorating. further,
Since the rack 16 and the pinion 17 forming the drive mechanism for driving the moving body 15 in the refrigerant introduction tube 11 are arranged inside the tube 11, the arrangement space of the drive mechanism is reduced, and the heat exchanger is reduced. 1 can be prevented from increasing in size. Particularly, in the above-described embodiment, the axially long rack 16 is arranged on the refrigerant introduction side of the tube 11 with respect to the moving body 15 to prevent the tube 11 from becoming unnecessarily long.

The present invention is not limited to the above embodiment. For example, in the above embodiment, two refrigerant inlets 13d,
Although 13e is closed, the number of refrigerant inlets to be closed is not particularly limited. Further, the moving body may be driven by a fluid pressure actuator, or may be driven by a pressure difference between a pressure on one side in the axial direction and a pressure on the other side in the axial direction with respect to the moving body in the tube. Further, the tube is not limited to a cylindrical shape, and may be, for example, a rectangular tube shape.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A plurality of refrigerant flow paths and tubes for introducing a refrigerant into these refrigerant flow paths are provided, and a plurality of refrigerant introduction ports facing the inlets of the respective refrigerant flow paths are formed in this tube, and the tubes are formed. It is preferable to provide a moving body capable of opening and closing at least one refrigerant introduction port by moving inside, and to arrange the constituent members of the driving mechanism of the moving body in the tube. By disposing the components of the drive mechanism in the tube, it is possible to reduce the space for disposing the drive mechanism, prevent the heat exchanger from increasing in size, and prevent the performance of the aircraft from deteriorating due to the increase in weight.

The moving body is not limited to the cylindrical shape which moves in the axial direction. For example, a plurality of refrigerant flow paths and a tube for introducing refrigerant into these refrigerant flow paths are provided, and a plurality of refrigerant introduction ports facing the inlet of each refrigerant flow path are formed in this tube,
As shown in FIG. 4, a cylindrical moving body 41 may be inserted into the tube 40, a rotary drive mechanism (not shown) for the moving body 41 may be provided, and an opening 41a may be formed in the peripheral wall of the moving body 41. By the rotation of the moving body 41, as shown in (1) of FIG. 4, a state in which the opening 41a of the moving body 41 and at least one refrigerant introduction port 40a of the tube 40 overlap each other, and (2) of FIG. As described above, the state can be changed to the state in which the peripheral wall of the moving body 41 closes the refrigerant introduction port 40a. When overlapping with the opening, the refrigerant is introduced into the refrigerant channel from the refrigerant inlet 40a. As a result, it is not necessary to move the moving body in the axial direction, so that it is possible to prevent the size of the tube in the axial direction from being shortened and prevent the heat exchanger from increasing in size, and to prevent the performance of the aircraft from being deteriorated due to the increase in weight.

[Brief description of drawings]

FIG. 1 is a front sectional view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a plan sectional view of a heat exchanger according to an embodiment of the present invention.

FIG. 3 is a side sectional view of the heat exchanger according to the embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a heat exchanger of a modified example of the present invention in a state where the refrigerant introduction port is closed, and (2) is a partial cross-sectional view in a state where the refrigerant introduction port is opened.

FIG. 5 is an explanatory diagram of a configuration of a conventional air conditioner.

[Explanation of symbols]

 6a, 6b, 6c, 6d, 6e Refrigerant channel 7a, 7b, 7c, 7d, 7e, 7f Refrigerant cooling air 8 Heat transfer plate (heat transfer part) 15 Moving body

Claims (1)

[Claims] 1. A heat exchanger comprising: a refrigerant flow path; a fluid flow path for cooling the refrigerant; and a heat transfer section interposed between the refrigerant flow path and the refrigerant cooling fluid flow path. A heat exchanger characterized in that the flow passage area on the refrigerant side can be changed.