JPS6114056Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an observation heat pipe that allows the operating status of the heat pipe to be easily observed from the outside.

Heat pipes have been used in heat exchangers, radiators, etc. as components that efficiently transmit thermal energy, but as they are still in the development stage, it is important to ask school education or technology development departments to explain their working principles and usefulness. What should be communicated to research engineers is
This is essential for future industrial development.

As a means of visually recognizing the operating status of a heat pipe, it is possible to observe the status of heat propagation and uniform heating by attaching a temperature sensing element that changes color at a certain temperature to the outer wall of the metal container that makes up the heat pipe. Although it is possible, this method does not allow the observation of internal steam flow, and it is not easy to see the difference when comparing it with a bar material that has relatively good thermal conductivity. For this reason, attempts have been made to construct the heat pipe in a transparent container made of glass or other material and to directly observe its operating status, but in this case, it would be difficult to fabricate if a windmill is installed inside, and Without a windmill, only a slight flow of condensate on the wall can be discerned.
Other attempts have been made to use a colored liquid as the working fluid, but with this method, the medium and colored material separate during evaporation, resulting in a colorless and transparent vapor flow, which is difficult to observe.

The present invention aims to eliminate these drawbacks, and aims to provide a heat pipe in which the flow of steam and the condensation of steam at the heat dissipation part can be visually observed.

The drawings will be explained below. FIG. 1 shows an example of a conventional observation heat pipe, in which 1 is a transparent hollow sealed container made of glass or the like, and 2 is a working fluid sealed inside the container.

In the present invention, as shown in FIGS. 2 and 3, a tubular hollow airtight container 1 is formed from a transparent material such as glass, and the inside of this hollow airtight container 1 is deaerated, and water, alcohol, etc. working fluid 2
is enclosed, and a constriction part 3 is formed at an intermediate position of the heat dissipation part b, which allows the vapor flow to pass through but prevents the condensate from flowing down. In the figure, a indicates a heat receiving part.

The operating situation will be explained below with reference to FIG. In a situation where the heat receiving part a is positioned downward and the heat dissipating part b is located above, and the working fluid 2 is accumulated in the heat receiving part a, when heat is applied from the outside to the heat receiving part a, the working fluid 2 evaporates. The vapor flows through the contraction part 3, condenses in the heat radiation part b, flows down, and accumulates above the contraction part 3. Subsequently, the vapor stream likewise passes through the condensation section 3 and passes in the form of bubbles 5 through the condensate 4 which accumulates above it. This phenomenon continues until the working fluid 2 in the heat receiving part a evaporates. When the working fluid 2 is water or alcohol, it is sufficient to heat the heat receiving part a at about human body temperature.
It is activated by squeezing it by hand and does not require any special heating equipment. The reduced liquid 4 accumulated above the reduced part 3 can be easily refluxed to the heat receiving part a by heating the heat radiating part b. Further, by allowing a portion of the working fluid 2 to accumulate in the upper space of the contracting portion 3 in advance, it is possible to easily observe the generation of bubbles 5 indicating a vapor flow. Alternatively, a liquid retention wick (not shown) may be inserted into the heat receiving part a to expand the heat receiving area.

As mentioned above, the heat pipe according to the present invention not only allows the operation status to be visually observed through the accumulation of condensate due to the condensation of the vapor flow and the generation of bubbles in the condensate due to the vapor flow. Since it does not require a special heat source for its operation and can be manufactured at a low cost, it is extremely effective as a teaching material or for industrial development studies.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional observation heat pipe, FIG. 2 is a sectional view of the observation heat pipe of the present invention, and FIG. 3 is an explanatory diagram of its operation. 1...Transparent hollow airtight container, 2...Working fluid,
3... Reduction part, 4... Condensate, 5... Bubbles, a...
...Heat receiving section, b... Heat dissipating section.

Claims (1)

[Scope of utility model registration request] The inside of a transparent hollow airtight container 1 is deaerated and a working fluid 2 such as water or alcohol is sealed therein, and its heat dissipation part b
A heat pipe for observation, which is provided with a constriction part 3 at an intermediate position to allow steam to flow through but to prevent condensate from flowing down.