JPH1183349A - Two-layer pipe with self-temperature control function and heat exchanger using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-layer pipe having self-temperature control function and a heat exchanger using it with simple structure. SOLUTION: In the two-layer pipe, its hollow pipe body 2 is split into a primary fluid passage 4 and secondary fluid passage 5 to be partitioned by a partition wall 3 extended in its lengthwise direction in the body 2. In this case, the partition wall 3 is formed of good thermal conductor of bimetal, shape memory alloy or the like changing in shape so as to rise to the passage 4 side or passage 5 side in a predetermined temperature range. Thus, since the opening area ratio of both the passages is changed so that flow rate ratio of both the fluids is automatically optimally altered, predetermined taking-out temperature of the one fluid can be always maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-layer pipe having a self-temperature control function and a heat exchanger using the same.

[0002]

2. Description of the Related Art Conventional heat exchangers are used in combination with some kind of temperature control mechanism to obtain a desired temperature. For example, an electric or mechanical temperature control mechanism is provided on the header side of the heat exchanger main body in which a number of heat transfer tubes are arranged, and the temperature of the primary fluid and the secondary fluid previously passed through the heat exchanger main body by this temperature control mechanism is set. The take-out temperature is arbitrarily controlled by adjusting the flow rate and the flow rate.

[0003] Therefore, the conventional heat exchanger has the disadvantage that the structure becomes complicated and the manufacturing cost increases.

Accordingly, the present invention has been devised in order to effectively solve such a problem. An object of the present invention is to provide a two-layer pipe having a self-temperature control function in place of a heat transfer tube through which a fluid flows. An object of the present invention is to provide a heat exchanger having a novel self-temperature control function capable of simplifying the structure by using the heat exchanger.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a hollow pipe main body which is divided into two parts by a partition extending in the longitudinal direction to form a primary fluid passage and a secondary fluid passage. The partition wall is made of a bimetal or shape memory alloy which is a good heat conductor and changes its shape so as to protrude toward the primary fluid passage or the secondary fluid passage within a certain temperature range.

Accordingly, since the partition wall is deformed so as to protrude to either the primary fluid passage side or the secondary fluid passage side in a certain temperature range, the opening area ratio of both passages changes, and the flow ratio of both fluids changes. Therefore, if only the inflow temperature of one of the two fluids is controlled to be constant, the temperature at which the other fluid is taken out can always be kept constant.

In another invention, a plurality of such two-layer pipes are arranged in layers, and a primary fluid inlet / outlet header and a secondary fluid inlet / outlet header are respectively provided at the entrances and exits of the primary fluid passage and the secondary fluid passage of these two-layer pipes. And are connected.

Accordingly, if the primary fluid is flown to the primary fluid inlet header side at the same time and the secondary fluid is flown to the secondary fluid inlet header side, the primary fluid and the secondary fluid can be supplied to the respective two-layer pipes. After efficient heat exchange is performed by diverting the fluid to the primary fluid passage and the secondary fluid passage, any fluid that has reached a certain removal temperature is collected from the primary fluid outlet header or the secondary fluid outlet header. It is possible to perform efficient heat exchange.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a two-layer pipe 1 having a self-temperature control function according to the present invention.

As shown in the figure, the two-layer pipe 1 is formed by dividing a hollow pipe body 2 into upper and lower parts by a strip-shaped partition 3 extending in the pipe body 2 in the longitudinal direction. The partition 3 defines a primary fluid passage 4 through which a primary fluid flows and a secondary fluid passage 5 through which a secondary fluid flows.

Therefore, for example, as shown by the arrow in the drawing,
By simultaneously flowing a low-temperature primary fluid to the primary fluid passage 4 and a high-temperature secondary fluid to the secondary fluid passage 5, heat exchange is performed between the two fluids through the partition 3.

The pipe body 2 is not integrally formed, but is formed by a half-split pipe unit 2a, which is vertically divided into two parts by a partition wall 3, as shown in the figure. Flanges 2b, 2b at both edges of 2a
However, it is connected to the upper and lower surfaces of the partition 3 so as to prevent fluid leakage by, for example, baking or bonding.

The partition walls 3 are made of a material which changes in shape depending on a certain temperature, such as a bimetal formed by bonding metals having excellent thermal conductivity and different thermal expansion coefficients, or a shape memory alloy. As shown in FIG. 2, at a certain temperature, the primary fluid passage 4 or the secondary fluid passage 5 is deformed so as to protrude.

That is, in a certain temperature range, FIG.
As shown in FIG. 2A, the partition wall 3 protrudes to the primary fluid passage 4 side to narrow the primary fluid passage 4 side, and in a certain temperature range, the partition wall 3 becomes as shown in FIG. The secondary fluid passage 5 is deformed so as to protrude toward the secondary fluid passage 5 and narrow the secondary fluid passage 5.

On the other hand, the material constituting the pipe main body 2 is not particularly limited. However, if a material having excellent heat insulating properties and moldability, such as plastic, is used, heat input and output from the pipe main body 2 can be suppressed. In addition to being able to be manufactured, it can be easily manufactured.

The operation of the present invention will be described above.

First, in the state as shown in FIG. 1, the primary fluid flowing through the primary fluid passage 4 is a low-temperature fluid, the secondary fluid flowing through the secondary fluid passage 5 is a high-temperature fluid, and both fluids are heated via the partition 3. In the case of replacement, the primary fluid discharged from the primary fluid passage 4 is heated by the high-temperature secondary fluid to increase the temperature, and the secondary fluid discharged from one of the secondary fluid passages 5 becomes the low-temperature primary fluid. Cooled by the fluid, the temperature will drop.

At this time, the partition wall 3 is deformed so as to protrude to either the primary fluid passage 4 side or the secondary fluid passage 5 side depending on a certain temperature range as described above. And the flow rate ratio of the two fluids changes, so that even if the inflow temperature of either one of the two fluids is kept constant, the removal temperature of the other fluid can always be kept constant.

For example, if the partition wall 3 which is tempered so as to protrude toward the primary fluid passage 4 and be deformed in a certain temperature range (A ± α) is used, the discharge temperature of the primary fluid is kept in a certain temperature range (A
± α), as shown in FIG.
The partition wall 3 rises toward the primary fluid passage 4 to reduce the flow rate of the primary fluid and simultaneously increase the flow rate of the secondary fluid, whereby the discharge temperature of the primary fluid can be automatically increased. When the temperature of the primary fluid exceeds a certain temperature range (A ± α), the partition wall 3 is deformed so as to return to the original flat state, and the flow rate of the primary fluid on the primary fluid passage 4 side is reduced. By increasing, the temperature of the primary fluid is prevented from rising more than necessary.

Further, if the partition wall 3 which has been tempered so as to protrude and deform on the side of the secondary fluid passage 5 in a certain temperature range (A ± α), the discharge temperature of the primary fluid can be kept at a certain temperature. When the pressure exceeds the range (A ± α), as shown in FIG. 2 (B), the partition wall 3 protrudes toward the secondary fluid passage 5 to reduce the flow rate of the secondary fluid, and at the same time, reduces the flow rate of the primary fluid. The discharge temperature of the primary fluid can be lowered by increasing the flow rate. When the temperature of the primary fluid falls below a certain temperature range (A ± α), the partition wall 3 is deformed so as to return to the original flat state, and the secondary fluid on the secondary fluid passage 5 side is deformed. Increasing the flow rate will prevent the temperature of the primary fluid from lowering unnecessarily.

As described above, according to the present invention, the inside of the pipe body 2 is
Since the dividing wall 3 is made of a material that can be deformed in a certain temperature range, the opening area of the primary fluid passage 4 and the secondary fluid passage 5 can be changed to control the flow ratio of the two fluids. On the other hand, it is possible to always control the temperature to be constant.

In this embodiment, the pipe body 2 is divided into two parts vertically by the partition wall 3. However, it is needless to say that the same operation and effect can be obtained even if the pipe body 2 is divided into two parts horizontally or diagonally. Nor.

Next, FIG. 3 shows an embodiment of the heat exchanger 6 using the two-layer pipe 1 having such a self-temperature control function.

That is, the heat exchanger 6 is formed by arranging a plurality of the two-layer pipes 1 having the above-described self-temperature control function into a unit, and is provided at the entrance and exit of the primary fluid passage 4 and the secondary fluid passage 5 of each of the two-layer pipes 1. The primary fluid inlet / outlet headers 7, 8 are connected to the secondary fluid inlet / outlet headers 9, 10, respectively.

Therefore, by simultaneously flowing the primary fluid to the primary fluid inlet header 7 side and simultaneously flowing the secondary fluid to the secondary fluid inlet header 9 side, the primary fluid and the secondary fluid are respectively separated into two layers. After efficient heat exchange is performed by diverting the fluid to the primary fluid passage 4 and the secondary fluid passage 5 side of the pipe 1, any fluid having a constant removal temperature is discharged into the primary fluid outlet header 8 or the secondary fluid outlet header 8. It is possible to collectively take out from the fluid outlet header 10 side, and it is possible to perform efficient heat exchange.

The unit may be housed in a case (not shown), a heat insulating material may be attached to the periphery of the unit to enhance the heat insulating effect, or the unit may be used by being stacked in multiple stages. If this is the case, more efficient heat exchange can be achieved.

[0028]

In summary, according to the present invention, the temperature can be easily controlled without using an electric or mechanical temperature control mechanism, so that a simple and small-sized heat exchanger can be manufactured at a low cost. An excellent effect such as being able to be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a two-layer pipe according to the present invention.

FIG. 2 is a sectional view showing an operation of a partition wall provided in a two-layer pipe according to the present invention.

FIG. 3 is a perspective view showing one embodiment of a heat exchanger including a two-layer pipe according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Two-layer pipe 2 Pipe main body 3 Partition wall 4 Primary fluid passage 5 Secondary fluid passage 6 Heat exchanger

Claims (3)

[Claims] 1. A hollow pipe main body is divided into two parts by a partition extending in a longitudinal direction of the hollow pipe body to form a primary fluid passage and a secondary fluid passage, and the partition is made of a good heat conductor and within a certain temperature range. A two-layer pipe having a self-temperature control function, wherein the two-layer pipe is formed of a material whose shape changes so as to protrude toward the primary fluid passage side or the secondary fluid passage side. 2. The two-layer pipe having a self-temperature control function according to claim 1, wherein the partition wall is made of a bimetal or a shape memory alloy. 3. A two-layer pipe according to claim 1 or 2, wherein said two-layer pipe has a primary fluid inlet / outlet header and a secondary fluid inlet / outlet header at inlets / outlets of a primary fluid passage and a secondary fluid passage, respectively. And a heat exchanger.