JPH01150795A - Heat exchanger - Google Patents

Abstract

PURPOSE:To enable regulation of temperature in an automobile and to enable saving of a power, by a method wherein a heat exchange unit in which spiral heat pipes are situated in upper and lower air guide passages is rotated in a casing having the upper and lower air guide passages through which air in a closed space and an external space respectively, flow. CONSTITUTION:When temperature in a car room is increased, a temperature sensor switch 70 is actuated, a blast fan 50 feeds air in a car room to the interior of an air guide passage 31b by means of a solar battery 60, and air outside a car is fed in an air guide passage 31a. A heat pipe 10 absorbs heat from high temperature air, and dissipates heat to low temperature air. An impeller 40 is rotated by means of an air flow passing the air guide passage 31b, and a heat exchange unit B is rotated around a central axis 21. Each heat pipe 10 is repeatedly rotate to move between the upper stream side and the downstream side in the air guide passages 31a and 31b, and is actuated high- efficiently.

Description

[Detailed Description of the Invention] The present invention is a system for adjusting the temperature of a closed space to a suitable temperature by transferring heat between a closed space such as an automobile cabin and an outside space. This relates to a heat exchanger.

For example, if a car is left parked in direct sunlight for a long time during the summer, the temperature inside the car will rise significantly compared to the outside temperature, to the point where people will hesitate to get in the car again. It is. Furthermore, even if the car cooler is operated to lower the temperature inside the vehicle, the temperature difference between the desired comfort temperature and the desired comfort temperature is extremely large, so it takes a long time to reach the comfort temperature, and in this case, the engine Due to the idling state, the load on the cooler compressor is large,
The load on the engine that drives this car compressor is also large, which is a factor in reducing fuel efficiency. Note that with current car coolers, it is not possible to keep the car cooler running while the vehicle is parked and the driver is away from the vehicle. Therefore, various proposals have been made to prevent or alleviate the above temperature rise.

Some of the above proposals attempted to prevent the temperature rise by using a heat exchanger to transfer heat between the interior of the vehicle and the outside.

It is read as 13<”'l. By the way, the above-mentioned conventional heat exchanger uses a rod-shaped B1-pipe, and fins are arranged on this heat pipe to create a radiator panel-like heat exchanger. A unit is formed, and the heat absorption side and the heat radiation side of this heat exchange unit are arranged in the circulation air passage on the indoor side and the outdoor side, respectively.

By the way, the heat exchange unit of the conventional heat exchanger is shaped like a radiator panel and is therefore bulky and heavy, and the need for uniformly blowing air to the heat exchange unit has led to an increase in the size of the blowing fan.

Therefore, the size of the heat exchanger cannot be avoided, and the problem of power supply to the ventilation fan has also arisen. As the power for the above fan needs to be activated when the vehicle is parked, an in-vehicle battery or a solar battery can be considered, but the in-vehicle battery has the problem of running out of power when restarting, and the above solar battery requires a large area. Therefore, there have been problems of increased cost and decreased aesthetic appearance.

The present invention has been made in view of the above problems, and is a heat generating system that adjusts the temperature inside the closed space by transferring heat between the closed space and the outside space. The exchanger includes a casing having upper and lower air guide passages for circulating air in the closed space and air guide passages for circulating air in the external space, and a casing rotatably disposed inside the casing. a heat exchange unit equipped with a plurality of spiral-shaped heat pipes whose upper half and lower half are respectively located in the two air guide channels, and air from the closed space and the external space into each of the air guide channels. A heat exchanger characterized by comprising a blower fan to be introduced.

Yesterday, the heat exchanger according to the present invention rotates the upper and lower half portions of each heat pipe within each air guide path by rotation of the heat exchange unit, and closes the heat pipe introduced into each air guide path by a blower fan. By uniformly bringing the air in the space and the air in the outside space into contact with each of the heat pipes, uniform and effective heat transfer can be carried out in each heat pipe, and each heat pipe has The spiral shape has a long effective length, a large surface area involved in heat absorption and radiation, and extremely high heat transfer efficiency, so heat can be transferred efficiently (quickly) between the closed space and the outside space. Therefore, the temperature of the closed space can be quickly adjusted.

Figures 1 to 4 show an embodiment in which a heat exchanger according to the present invention is used in an automobile.

The heat exchanger (A) according to the present invention is a heat exchanger unisol l-
(B), a casing (30) rotatably housing this heat exchange unit (B), and a casing (30)
It consists of a blower fan (50) that blows air into the
A solar cell (60) and a temperature sensor (70) are connected to the blower fan (50).

The heat exchange unit (B) includes a predetermined number of heat pipes (10) and a holder (20) that holds the heat pipes (10).

As shown in the figure, the heat pipe (10) has a predetermined outer diameter at a predetermined pitch. It is bent into a spiral shape. That is, by forming the heat pipe (10) into a substantially coil spring shape, the effective length and surface area of the sealed tube enclosing the working fluid are increased.

The holder (20) has holding plates (22a) (22b) (22C
) are fixed together. Then, the above retaining plate (2
2a) (22b) (22c), each heat pipe (
A predetermined number of heat pipes (10) can be held at equal intervals around the periphery of the holder (20) by supporting both upper and lower ends and the center of the holder (10).

The casing (30) has two air guide paths (31
a) (31b), and the heat exchange unit (B) is located in the center of the casing (30).
It is arranged astride the two air guide paths (31a) and (31b). That is, bearings (32) (32
), and a holder (
The heat exchange unit (B) is rotatably accommodated in the casing (30) by supporting both ends of the central shaft (21) of the heat exchange unit (B).

A circular window hole (33a) is formed in the center of the partition wall (33) that partitions the air guide path (31a) (31b), and the window hole (33a) is provided with the holder (2).
The upper and lower half parts of each heat pipe (10) are connected to each air guide path (3) by positioning the central retaining plate (22C) of
1a) (31b).

Moreover, the upstream side (the first
On the left side in the figure) is the heat exchange unit l-(B).
An impeller (40) is arranged close to. The lower end of the rotating shaft (41) of the impeller wheel 40) has a gear (42).
), and this gear (42) is connected to the holder (20
) Gear part (g) on the outer periphery of the retaining plate (22b) on the lower end side
It goes hand in hand with this.

The above-mentioned ventilation fan (50) is of an axial flow type with a motor (M) integrated therein, and the above-mentioned upper air guide path (
31a) is attached to the open end on the right side in FIG. 1, and the lower air guide path (31b) is attached to the open end on the left side in FIG. Here, each blower fan (50) is
It has a structure that operates to blow outside air into each air guide path (31a) (31b).

A solar cell (60) is connected to the motor (M) of each of the blower fans (50) via a temperature sensor switch (70).

The temperature sensor switch (70) functions to connect the solar cell (60) and the motor (M) when the temperature exceeds a predetermined set temperature.

When installing the heat exchanger (A) in a car, the lower air guide path (31b) is piped so that air can circulate in areas where the temperature rises significantly in the vehicle interior, and the upper air guide path (31b)
The solar cell (60) is placed in a place where it can effectively receive direct sunlight, such as the roof or the upper surface of the dash board. The temperature sensor switch (70) is installed at the position where the room temperature is highest.

A desired operating temperature is set in the temperature sensor switch (70).

The operation of the heat exchanger will be described below when the vehicle is left in direct sunlight.

L: When the temperature inside the vehicle increases due to direct sunlight and reaches the operating temperature of the temperature sensor switch (70), the temperature sensor switch (70) is activated and the solar cell (
Electric power from the fan (60) is supplied to the motor (
M).

Then, the blower fan (50) attached to the lower air guide path (31b) sends the high-temperature air inside the vehicle into the air guide path (31b), and blows the air into the upper air guide path (31a).
) The blower fan (50) installed in
Air is sent into the air guide path (31a).

The high-temperature air flowing through the lower air guide path (31b) comes into contact with the lower half of each heat pipe (10) located in this air guide path (31b), and the upper air guide fi' 3
The low temperature air flowing through (31a) is
a) contacting the upper half portion of each heat pipe (10) located within; Then, each of the heat pipes (10) absorbs this heat from the high temperature air very quickly,
Very quickly released into the cold air. Here, since each of the heat pipes (10) has a substantially coil spring shape as described above, the effective length of each of them is several times longer than the height. In general, it is known from various experiments that the heat transfer efficiency of a heat pipe is proportional to the square of the length ratio if the sealed pipes have the same diameter, and each of the heat pipes (10) has a coil spring shape. Because of the spiral shape, the surface area involved in heat exchange is increased compared to a heat pipe with the same outer diameter, resulting in extremely high heat transfer efficiency. Therefore, the lower air guide path (31
b), the heat is removed and the cooled air is blown into the passenger compartment.Then, the air in the passenger compartment is circulated through the air guide path (31b''), and the air inside the passenger compartment is blown out. The temperature drops rapidly.On the other hand, the upper air guide path (
31a), fresh cold air from outside the vehicle is continuously sucked in, absorbs the heat of the air inside the vehicle, and then is discharged to the outside of the vehicle again.

Moreover, at this time, the impeller (40) disposed in the air guide path (31b) is rotating due to the airflow passing through the air guide path (31b) on the lower side, and the rotation of this impeller (40) The operation is based on the rotating shaft (
41) and the gear portion (g) of the locking plate (22b) on the lower end side of the holder (20), the heat is transmitted to the heat exchange unit) (B). )
is rotated around the central axis (21). Therefore, by the rotation of the heat exchange unit (B), each heat pipe (1o
) rotates repeatedly between the upstream and downstream sides of each air guide path (31a) (31b), and thereby the vehicle introduced into the lower air guide path (31b) Each heat via” (10)
The low-temperature air outside the vehicle introduced into the upper air guide path (31a) can be brought into uniform contact with the upper half of each heat pipe (1o). be able to. And each of the above air guide paths (31a)
Since the air flow directions in (31b) are opposite to each other, each of the heat pipes (1o) can be operated efficiently under uniform conditions, and the heat pipe (1o) itself can be operated efficiently. Combined with this effect, a heat exchanger with extremely high heat exchange efficiency can be obtained. In other words, even if the amount of air blown by each of the above-mentioned blower fans (50) is small, the heat exchange efficiency of the heat exchange unit is extremely high, so a sufficient temperature adjustment effect can be exerted. ) can be made smaller and consume less power, as well as the drive power source (solar battery) for the blower fan (50).
It also requires an extremely small capacity. In addition, as mentioned above, since the heat exchange efficiency of the heat exchange unit (B) is extremely high, it is easy to reduce the size and weight of the heat exchange unit (B) itself, that is, the size and weight of the heat exchanger (A) itself. Furthermore, since the blower fan (50) can be made smaller and consume less power, it can be operated on the vehicle's battery without worrying about the battery running out even when the driver leaves the vehicle. This also effectively suppresses the rise in temperature inside the car, which eliminates the discomfort caused by the heat when re-boarding the car, and also allows the car cooler to adjust the temperature to a comfortable temperature in an extremely short time. Moreover, since the heat load applied to the car cooler is reduced, the load on the cooler compressor and engine can be reduced, and fuel efficiency can be improved.

Diagrams showing the experimental results of the temperature tensioning effect using the heat exchanger (A) having the above configuration are shown in FIGS. 5 to 8, and will be explained below. In each of the above diagrams, the curved line indicates the outside air temperature, and the curved opening indicates the closed space (box-shaped container or car interior).
The temperature in curve C is the temperature in the heat radiation side air guide path (3) of the heat exchanger (A).
Curve 2 shows the exhaust gas temperature in the intake air guide path (31b) of the heat exchanger (A). The heat exchanger (A) used in each of these experiments was made by bending a sealed tube with a diameter of 3 m and a length of 500 mm into a coil spring shape with an outer diameter of 30 mm and a length of 10 mm. 14 heat pipes (10) are used, and the blower fans (50) (50) can be operated as appropriate.

In addition, in each experiment, a 700W/1200W switchable electric hot air fan was used as a heat source to ensure uniformity of experimental conditions and ease of reproduction.

The fifth item is a box-shaped container with internal dimensions of 60em x 60 (1) x 90 (to), in which the electric hot air fan is operated at 700 W.
FIG. 3 is a diagram showing the results of an experiment in which the effect of adjusting the temperature m in the container was investigated by operating the blower fan (5o) of the heat exchanger (A) after one hour. As shown in the figure, the temperature inside the container (at the curved opening) is changed from room temperature of 28°C to 7°C using an electric hot air fan.
The temperature rises to nearly 0℃, but the blower fan (50) <5
0), the temperature drops to 60°C in about 2 minutes, and then gradually drops to balance with the outside temperature (curve C). At this time, the temperature of the cooled air blown into the container from the heat exchanger (A) (curve 2) is extremely lower than the temperature inside the container, as shown in the figure, and the efficiency of the heat exchanger (A) is It shows that it is extremely high.

FIGS. 6 to 8 show the actual temperature suppression effect using an automobile, and the interior volume of the above-mentioned automobile is about 1.7 m.

Figure 6 shows that the electric air heater is operated at 700W in the vehicle interior under the condition that the outside temperature (curve A) is 28℃.
When the temperature at the curve opening) reached 61°C, the electric hot air fan was turned off and the heat exchanger (A) was activated, and the temperature inside the vehicle was reduced by nearly 20°C in a few minutes.

Figure 7 shows that the above electric hot air fan is operated at 700W in the passenger compartment under the condition that the outside temperature is 28℃ and the heat exchanger (A) is also operated. Only the wind machine was turned off. In this case, the cabin temperature (at the beginning of the curve) remains constant at approximately 44 degrees Celsius, showing no rising trend, and after the electric warm air fan is turned off, it rapidly increases by more than 10 degrees Celsius in a few minutes as described above. After that, it decreases to balance with the outside temperature (curve A).

Figure 8 shows that an electric hot air fan of 700 W is operated inside the vehicle at an outside temperature of 20°C, and after a predetermined time TI, the air inside the vehicle is stirred by the occupant inside the vehicle. After making the temperature distribution uniform, the electric hot air fan was operated at 1200 W after a predetermined time T2, and the heat exchanger (A) was operated after a predetermined time Ta. In this case as well, even though the electric air heater was operating at 1200W, the cabin temperature (curve opening) decreased by nearly 10"C within a few minutes after the heat exchanger (A) was activated, and the rest was as described above. Similarly, the outside temperature (curve A)
It is decreasing in order to balance it.

In the above embodiments, the heat exchanger according to the present invention was used to suppress the rise in temperature inside the vehicle cabin during the summer season, etc., but conversely, when the outside temperature is low during the winter season, etc., the heat exchanger according to the present invention By using this, it is also possible to prevent the temperature inside the vehicle from decreasing.

Further, the heat exchanger according to the present invention can be used not only for controlling the temperature inside the vehicle interior as described above, but also for controlling the temperature of electronic devices such as computers and closed spaces such as warehouses.

In particular, when applied to electronic devices such as the computers mentioned above, it is possible to adjust the temperature without introducing outside air into the case of the electronic device like a general cooling fan, which has previously been a problem. Malfunctions caused by ingress of dust and the like can be prevented, and the reliability of the computer can also be improved.

As explained above, in the heat exchanger according to the present invention, each heat pipe uniformly contacts the air flowing through each air guide path due to the rotation of the heat exchange unit, so that each heat pipe operates uniformly and effectively. Moreover, since the heat transfer efficiency of the heat pipe itself is high, the heat exchange efficiency of the heat exchange unit itself is extremely high, and heat can be quickly transferred between the closed space and the outside space in a short time. , the temperature of the closed space can be quickly adjusted.

Furthermore, the heat exchanger according to the present invention has an extremely high heat exchange efficiency, so even a small one can sufficiently control the temperature.Furthermore, since the heat transfer efficiency by the heat pipe is also significantly high, the heat exchanger has an extremely high heat exchange efficiency. The air flow rate to the fan may be small, so the blower fan can be made smaller and have lower output. Therefore, according to the present invention, it is possible to provide a heat exchanger that is small and lightweight, can be operated with a small driving force, and has an extremely high temperature control ability.

Furthermore, since the heat exchanger according to the present invention can be made smaller and lighter, and the blower fan can be made smaller and more energy efficient, when applied to a car as described above, there is no need to worry about the battery dying even when the driver leaves the car. It can also be operated using the car's on-board battery.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the heat exchanger according to the present invention, FIG. 1 is a plan view, and FIG. 2 is a
The I-line sectional view, FIG. 3, and FIG. 4 are a front view and a plan view of a heat vibrator used in the heat exchanger. FIGS. 5 to 8 are diagrams showing the experimental results of the temperature adjustment effect of the heat exchanger, respectively. (A) - heat exchanger, (B)... - heat exchange unit, (1
0) - heat pipe, (30) - casing, (31a) (31b) - one channel, (50) - ventilation fan. Agent Gangwon Province
Me! ] Niu (-Town number-^--Example 11 Figure 1 Figure 3'i35 Figure 6 Visitor spit B%MC C-, t)

Claims (1)

[Claims] (1) A heat exchanger that controls the temperature in the closed space by transferring heat between the closed space and the outside space, comprising an air guide path through which air in the closed space circulates; A casing having upper and lower air guide channels through which air from the outside space circulates; and a casing rotatably disposed inside the casing, with the upper half and lower half positioned in the two air guide channels, respectively. A heat exchanger comprising a heat exchange unit including a plurality of spiral heat pipes, and a blower fan that introduces air from a closed space and an outside space into each of the air guide paths.