JP2677864B2 - Heat pipe heat exchanger - Google Patents

Description

The present invention relates to a heat pipe type heat exchanger of a separation type.

"Prior art" Conventionally, in the separation type heat pipe type heat exchanger,
There is no proposal for a vapor-liquid separation mechanism provided on the top of the evaporation unit.

[Problems to be Solved by the Invention] In a conventional separation-type heat pipe heat exchanger, a steam pipe through which the working fluid vapor passes is installed at a higher level than the evaporation unit, and the upper part of the evaporation unit is connected to this steam pipe. There is no particular problem when communicating.

However, for example, the evaporation unit is installed at an appropriate place on the floor, and a steam pipe is piped in the floor of the floor (in the floor slab or in the double floor) to lower the upper part of the evaporation unit to a lower level. When communicating with a certain steam pipe, when the boiling inside the unit was intense, there was a risk that liquid would be mixed into the steam pipe and the pipe would become clogged.

An object of the present invention is to provide a heat exchanger of a heat pipe type heat exchanger of a separation type, which does not cause liquid clogging as described above even when a steam pipe is arranged at a level lower than the upper portion of an evaporation unit. It is in.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the heat pipe type heat exchanger according to the present invention has the upper header tube of an evaporator unit in which upper header tubes are connected to the upper ends of several pipes. But,
The upper header pipe and the steam pipe are communicated with a steam pipe arranged at a level lower than that of the upper header pipe, and the upper header pipe and the steam pipe are provided through a steam outlet provided in a state of communicating from the outside of the upper header pipe to the internal upper part. It is characterized by being communicated with each other.

The steam outlet is at the end sealing portion of the upper header tube,
It is constructed by connecting a pipe with a diameter smaller than the upper header pipe, or a pipe with a diameter smaller than the upper header pipe from the lower end of the upper header pipe to the upper part of the header pipe. It is desirable to configure so as to rush into.

[Operation] In the heat exchanger structure according to the present invention, the upper header pipe is provided with a steam outlet communicating from the outside to an upper portion inside, and the upper header pipe and the steam pipe are communicated via the steam outlet. Therefore, the hydraulic fluid does not reach the vapor outlet even if boiling in the evaporation section is intense.

Therefore, even if the steam pipe is arranged at a level lower than that of the evaporation unit, if the steam outlet is communicated with the steam pipe, the working liquid does not enter the steam pipe and liquid clogging does not occur.

"Example" With reference to drawings, the suitable example of the heat pipe type heat exchanger concerning the present invention is described below.

FIG. 1 exemplifies a configuration diagram of a separated heat pipe type heat exchanger according to an embodiment of the present invention. On a floor a of a building (not shown), an evaporator unit 1 is provided at each individual place to be cooled. is set up.

Each evaporation unit 1 includes several pipes 11 made of a metal having good thermal conductivity such as copper, aluminum or alloys thereof.
These pipes 11 are arranged at regular intervals, and the upper header pipe 12 and the lower header pipe 13 are connected to the upper and lower ends thereof, and the entire unit 1 is made of a metal material having good thermal conductivity. It is mounted in contact with the heat-sensitive frame 14 made of.

In the floor slab b of the floor a, the steam pipe 2 leading to the terminal heat exchanger 5 at a level higher than the liquid level of the working fluid c.
And a liquid pipe 3 communicating with the terminal heat exchanger 5 via a liquid level controller 4 for the working liquid c, and each upper header pipe
The ends of 12 communicate with the steam pipe 2 via the connection pipe 22 and the valve 21, respectively, and the lower header pipes 13 communicate with the liquid pipe 3 via the valve 31, respectively.

The terminal heat exchanger 5 is installed in a chilled water pipe (not shown) from a cold heat source device (not shown) provided at an appropriate place in the building so that the inside is constantly cooled to a predetermined temperature.

A predetermined amount of hydraulic fluid (trade name "CFC") c is enclosed in the heat pipe heat exchanger, and the liquid level of the hydraulic fluid c is kept constant. When the temperature around the evaporation unit 1 reaches a predetermined temperature or higher, the internal working fluid c boils to remove heat from the surroundings and cool the part.
The steam due to boiling of the working fluid c reaches the terminal heat exchanger 5 from the upper header tube 12 through the steam tube 2, and the working fluid c condensed here is circulated to each evaporation unit 1 through the liquid tube 3. To do.

In this embodiment, one end of the upper header tube 12 in each evaporation unit 1 is configured as a gas-liquid separation mechanism 15 or 16 as described later.

One gas-liquid separation mechanism 15, as illustrated in FIG. 2A,
At the upper part of the end plate 18 that seals the end portion of the upper header tube 12, so as to communicate to the inside from the side, 1 / of the upper header tube 12
It is configured by attaching a steam outlet 17 composed of a pipe having a slightly smaller inner diameter.

When the lower end portion of the connecting pipe 22 integrated with the steam outlet 17 is connected to the steam pipe 2 in the floor slab b, even if the boiling in each pipe 11 is intense, the working fluid c scattered by the boiling is vaporized. It does not reach the outlet 17, and therefore does not cause liquid clogging in the steam pipe 2.

The other gas-liquid separation mechanism 16 is, as illustrated in FIG.
At the end of the upper header tube 12, the tip is
The upper end of the connecting pipe 22 is projected from below so as to reach the upper part of the inside, and the upper end of the connecting pipe 22 is configured as a steam outlet 17.

Therefore, even if the boiling of the working fluid c is intense in the pipe 11, the scattered working fluid does not reach the vapor outlet 17.

Other configurations and operations in this embodiment are the same as those in the embodiment of FIG. 2A, and therefore description thereof will be omitted.

In the embodiment shown in FIGS. 2A and 3, for example, as shown in FIG. 2B, the lower end of the steam outlet 17 is connected to the pipe 1 by the return pipe 17a.
If the hydraulic fluid c enters the steam outlet 17 at the time of boiling by communicating with the hydraulic fluid c above the liquid level of 1,
The liquid can be configured to return to the inside of the pipe 11 and the connection pipe 22 can be laterally connected to the steam outlet 17 to completely prevent the liquid clogging of the steam pipe 2. .

In each of the above-mentioned embodiments, as shown in FIG. 4, the evaporation portion of the pipe 11 can be constructed as a double pipe.

The pipe 11 of this example has an inner pipe 11b inserted into the outer pipe 11a through a narrow (0.1 to 1.5 mm) flow gap 11c that communicates with the vertical direction. The liquid level of the working fluid c is positioned between the upper and lower ends of the inner pipe 11b so as to be substantially the same as the length of the portion.

The inner pipe 11b and the outer pipe a may be fixed to each other by forming a plurality of protrusions protruding outward at appropriate portions of the inner pipe 11b or by fixing them to each other at appropriate portions of the outer pipe 11a. Form protrusions that are recessed inside the place and fix them to each other, or
It is desirable to fix them to each other by inserting or forming a suitable spacer between 11b and the outer tube 11a.

With this configuration, when the heat flux is low, the working liquid c mainly boils in the flow gap 11c, and the bubbles d generated by this boiling rise in the flow gap 11c while rapidly expanding, A turbulent state is created by pushing up the non-boiling hydraulic fluid, and even in the process of this rising turbulent flow, the hydraulic fluid c being pushed up constantly boils.

Therefore, the heat transfer coefficient does not decrease so much even under a low heat flux.

Moreover, the narrower the distribution gap 11c is, the narrower the gap 1
The height at which the bubble d in the 1c pushes up the unboiled hydraulic fluid c becomes stronger, and the height at which the gap 11c can rise while the bubble d and the hydraulic fluid c are turbulent (the distance that can rise from the liquid level of the hydraulic fluid c). Therefore, the distance from the liquid level of the working fluid c to the upper end of the inner pipe 11b is different by appropriately selecting the gap 11c of the pipe 11 in each evaporation unit 1 (the height of the evaporation unit 1 is different). ) It is possible to install a plurality of evaporation units 1 on the same floor and operate them with the same piping system.

A pipe different from the connecting pipe 22 is used for the steam outlet 17,
The pipe may be connected to the connecting pipe 22.

[Advantages of the Invention] According to the upper structure of the evaporation unit according to the present invention, since the evaporation outlet provided in the upper header pipe has a gas-liquid separation action, the steam pipe is arranged at a lower level than the upper header pipe. Even in this case, the liquid clogging of the steam pipe can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a heat pipe type heat exchanger using an evaporation unit having the structure of the embodiment of the present invention, and FIG. 2A is a partially enlarged sectional view of an upper structure of the evaporation unit in FIG. FIG. 2B is a partially enlarged cross-sectional view of another embodiment, FIG. 3 is a partially enlarged cross-sectional view of a superstructure of another evaporation unit in FIG. 1, and FIG. 4 is a modified example of a pipe constituting the evaporation unit. It is a partial expanded sectional view showing. Description of main symbols in the figure 1 is an evaporation unit, 11 is a pipe, 12 is an upper header pipe, 13 is a lower header pipe, 15 and 16 are gas-liquid separation mechanisms, 17 is a vapor outlet, 2 is a vapor pipe, 3 is Liquid pipe, 4 is a liquid level controller,
5 is a terminal heat exchanger.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Junji Satani 2-4-3 Okano, Nishi-ku, Yokohama-shi, Kanagawa Furukawa Electric Co., Ltd. Yokohama Research Laboratory (72) Inventor Tetsuo Okuyama 2 in Marunouchi, Chiyoda-ku, Tokyo 6-1 Inside Furukawa Electric Co., Ltd. (72) Inventor Susumu Seo 1-1-25 Minami-Kamata, Ota-ku, Tokyo Inside Furukawa Integrated Equipment Co., Ltd. (56) References: 63-104859 (JP, U) Actual Development Sho 61-101266 (JP, U)

Claims (1)

(57) [Claims] 1. The upper header pipe of an evaporator unit in which an upper header pipe is connected to the upper ends of several pipes is communicated with a steam pipe arranged at a level lower than the upper header pipe, and the upper header pipe is connected. The heat pipe type heat exchanger is characterized in that the steam pipe and the steam pipe are communicated with each other through a steam outlet provided in a state of communicating from the outside of the upper header pipe to an upper portion inside thereof.