JP3032425B2 - Heat pipe heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe type heat exchanger.

[0002]

2. Description of the Related Art In recent years, for the purpose of improving the dehumidifying effect of an air conditioner, a heat pipe type heat exchanger as shown in FIG.

In this heat pipe type heat exchanger, as shown in FIG. 4, an evaporating section a, a condensing section b, and a working liquid vapor evaporated in the evaporating section a are introduced into the condensing section b. And a return pipe d for returning the working fluid liquefied in the condenser section b to the evaporator section a.

That is, in an air conditioner using this heat pipe type heat exchanger, warm air entering the air conditioner is cooled to some extent (preliminary cooling) by passing through the evaporator a.
On the other hand, the working fluid in the evaporating section a evaporates due to the transfer of heat at that time. Further, the pre-cooled air is cooled by passing through a cooling coil for the original cooling of the air conditioner, and the vaporized hydraulic fluid enters the condensing portion b as indicated by an arrow e. Then, the working fluid in the condensing section b is cooled by the air that has passed through the cooling coil, and the air is reheated and liquefied. The liquefied working fluid returns to the evaporating section a as indicated by an arrow f. That is, in the air conditioner, these operations are repeated, and the warm air is cooled and discharged from the air conditioner.

Accordingly, as shown in FIG. 4, a height difference is provided between the evaporating section a and the condensing section b, the vapor pipe c is sequentially raised toward the condensing section b, and the reflux pipe d is sequentially raised toward the evaporating section a. I was descending.

[0006]

However, in the above-described conventional apparatus, a height difference is provided between the evaporating section a and the condensing section b so that the working fluid vapor flows from the upper steam pipe c to the condensing section b. In spite of the intention, at the start of the operation, the flow of the hydraulic fluid is not complete, so that the return pipe d also functions as a steam pipe, and there is a possibility that the hydraulic fluid vapor flows through the return pipe d as shown by the arrow g. Was. That is, there is a case where the operation does not proceed promptly (the operation as a normal heat pipe is not performed).

In order to prevent this, a method of reducing the diameter of the reflux pipe d and a method of providing a backflow prevention device such as a valve have been proposed.

[0008] However, even if the diameter of the reflux pipe d is reduced,
The backflow cannot be reliably prevented, and reducing the diameter of the reflux pipe d requires connecting pipes of different diameters, which is extremely troublesome. In addition, if the backflow prevention device is provided, the backflow can be surely prevented, but there is a drawback that the whole exchanger becomes complicated, and it is difficult to manufacture and the cost is high.

Accordingly, an object of the present invention is to provide a heat pipe type heat exchanger in which the operation as a heat exchanger is promptly performed at the start of operation.

[0010]

In order to achieve the above object, a heat pipe type heat exchanger according to the present invention comprises an evaporator, a condenser, and a working fluid vapor evaporated in the evaporator. a steam pipe for introducing into the condensation section, and the reflux condenser for returning the hydraulic fluid which is liquefied by the condensing unit to the evaporation unit, at a heat pipe type heat exchanger consisting of the reflux condenser In the evaporator
Then, the trap portion is curved in a U-shape in the vicinity of the evaporating portion of the reflux pipe so as to be filled with the working fluid.

[0011]

The working fluid is filled in the trap portion, and the working fluid vapor evaporated in the evaporating portion is not introduced into the condensing portion through the working fluid in the trap portion. That is, the working fluid in the trap section is in a state in which the reflux pipe is closed, whereby the gas generated by the evaporation of the working fluid in the evaporating section cannot cross the trap section, and as a result, Liquid backflow is prevented.

The trap portion is formed by bending the vicinity of the evaporating portion of the reflux pipe into a U-shape, and can be formed only by simple machining.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows a heat pipe type heat exchanger according to the present invention. This heat exchanger comprises an evaporator 1, a condenser 2,
A steam pipe 3 for introducing the working fluid vapor G (see FIG. 2) evaporated in the evaporating section 1 to the condensing section 2, and the working fluid S liquefied in the condensing section 2 is returned to the evaporating section 1. Reflux tube 4 for
And consisting of

By the way, as shown in FIG. 3 (a perspective view of the heat pipe type heat exchanger shown in FIG. 1),
The evaporating section 1 is composed of a block body 6 in which a plurality of fins 5 made of a metal thin plate such as aluminum are laminated, and a meandering pipe 7 inserted into the block body 6. Block body 8 formed by laminating the fins 5
And a meandering pipe 9 inserted into the block body 8.

The upper end of the meandering pipe 7 on the side of the evaporator 1 and the upper end of the meandering pipe 9 on the side of the condenser 2 are connected to each other via the steam pipe 3. The lower end of the pipe 7 and the lower end of the meandering pipe 9 on the side of the condensing section 2 are connected to each other by a return pipe 4. By the way, the upper end of the meandering pipe 9 on the condensing part 2 side is higher than the upper end of the meandering pipe 7 on the evaporating part 1 side, and the lower end of the meandering pipe 9 on the condensing part 2 side is meandering of the evaporating part 1. It is higher than the lower end of the pipe 7.

In the vicinity of the evaporator 1 of the reflux pipe 4,
As shown in FIG. 2, the trap portion filled with the hydraulic fluid S
10 are provided. That is, the trap portion 10 is formed by bending the vicinity of the evaporating portion 1 of the reflux pipe 4 into a U-shape.

In this heat pipe type heat exchanger, a plurality of (six in FIG. 3) straight pipes are arranged in parallel, and ends of the straight pipes are connected by a U-shaped pipe to form a pair of meandering pipes. Pipe 7,
9, the upper end of one meandering pipe 7 and the upper end of the other meandering pipe 9 are communicated and connected by the steam pipe 3, and the lower end of one meandering pipe 7 and the other meandering pipe 9 are connected. It can be manufactured by connecting the lower end of the pipe 9 in communication with the reflux pipe 4. In this case,
Before connecting to the meandering pipes 7, 9), a trap portion 10 is formed in the reflux pipe 4.

The heat pipe type heat exchanger is used, for example, in an air conditioner. That is, in this heat pipe type heat exchanger, the evaporating unit 1 is arranged on the air passage side of the air conditioner, and the condensing unit 2 is arranged on the air passage side of the air conditioner. A cooling coil for cooling the air conditioner is provided between the evaporator 1 and the condenser 2.

Therefore, the air (warm air) entering the air passage is
First, it passes through the evaporator 1. At this time, the working fluid S in the evaporating unit 1 evaporates due to the warm air, and enters the condensing unit through the steam pipe 3 as shown by the arrow A. Further, the working fluid S evaporated in the evaporating section 1
Absorbs heat from the warm air in the air intake path, and cools (pre-cools) the warm air before the warm air reaches the cooling coil. Then, the pre-cooled air is cooled by a cooling coil, and the cooled air is reheated by passing through the condensing section 2 and sent to the air supply passage. Further, since the hydraulic fluid S is cooled by the cooled air, it is condensed in the condenser 2 and returns to the evaporator 1 through the reflux pipe 4 as shown by the arrow B.

That is, the above operation is repeated, and the dehumidified and cooled air is discharged from the air conditioner through the air supply path.

However, at the start of the operation, even if the working fluid vapor G tries to enter the condensing section 2 through the recirculation pipe 4, the working fluid S accumulates as shown in FIGS. Since the trap portion 10 is provided, the trap portion 10 is not obstructed by the hydraulic fluid S and enters the condenser portion 2.

The hydraulic fluid S entering the condensing section 2 from the steam pipe 3 is cooled by the air passing through the cooling coil as described above, so that it is liquefied, returns to the trap section 10, and evaporates from the trap section 10. The hydraulic fluid S overflowing from the end on the part 1 side returns to the evaporating part 1. In other words, correct circulation of the working fluid S (evaporator 1 → steam pipe 3 → condenser 2 → reflux pipe 4 → evaporator 1) is promoted.

By the way, at the start of operation, as shown in FIG.
As described above, even when the amount of the working fluid S is large as shown in (b), the working fluid vapor G is generated by the working fluid S in the trap portion 10 as described above.
It does not enter the condensing section 2.

The meandering pipes on the evaporating section 1 side and the condensing section 2 side are formed using, for example, U-shaped pipes (consisting of a straight pipe and a U-shaped pipe). The number of meandering pipes can be increased or decreased by increasing or decreasing the number of meandering pipes, and the above-described correct circulation of the working fluid S can be smoothly performed even when the inclination angles of the steam pipe 3 and the reflux pipe 4 are set. It can be changed freely. Also, the radius of curvature of the trap section 10 must pass through the working fluid S when the working fluid vapor G of the evaporating section 1 is filled with the working fluid S and tries to enter the condensing section 2. What is necessary is just to be set as follows.

Further, as the trap section 10, the reflux pipe 4
It is sufficient to form at least one portion in the vicinity of the evaporating portion 1,
Of course, it can be freely formed at a plurality of places.

[0027]

Since the present invention is configured as described above, the following effects can be obtained.

At the start of the operation, the working fluid vapor G does not enter the condensing unit 2 through the reflux pipe 4, and the operation as an exchanger is performed promptly.

“The working fluid vapor G that has entered the condenser 2 from the vapor pipe 3 is liquefied and returns to the trap 10 of the reflux pipe 4.
The hydraulic fluid overflowing from the trap 10 returns to the evaporator 1. "
Therefore, it is possible to promote the correct circulation of the working fluid, and it is possible to exchange heat efficiently.

Since the trap portion 10 is formed only by simple machining, the trap portion 10 can be manufactured simply and without increasing the cost without complicating the entire structure.

[Brief description of the drawings]

FIG. 1 is a simplified front view showing an embodiment of the present invention.

FIG. 2 is a simplified sectional view of a main part.

FIG. 3 is a simplified perspective view.

FIG. 4 is a conventional simplified front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporation part 2 Condensing part 3 Steam pipe 4 Reflux pipe 10 Trap part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F28D 15/02 F28D 15/02 101

Claims (1)

(57) [Claims] An evaporating section, a condensing section, a steam pipe for introducing the working fluid vapor evaporated in the evaporating section to the condensing section, and an evaporating working fluid liquefied in the condensing section. In a heat pipe type heat exchanger comprising a return pipe for returning to the return section, the return pipe is sequentially lowered toward the evaporating section, and the vicinity of the return section of the return pipe is bent in a U-shape to operate. A heat pipe type heat exchanger wherein a trap portion filled with a liquid is formed.