JPH04151494A - Heat pipe type heat transmitting device - Google Patents

Abstract

PURPOSE:To circulate heat medium between an upper heat-absorbing device and a lower radiator and to transmit heat from the upper heat-absorbing device to the lower radiator by a method wherein a lower part of an ascending pipe for communicating an upper liquid reservoir with a lower liquid reservoir is provided with means for pushing up liquid heat medium. CONSTITUTION:A heat absorbing device 1 for gasifying heat medium with an inputted heat from a heat source is disposed above, and a radiator 3 communicated at its upper part with a descending pipe 2 communicated with an upper part of the heat absorbing device 1 is disposed below the heat absorbing device 1A bottom part of a lower liquid reservoir 4 communicating with a radiator 3 through a check valve 11 and an upper part of an upper liquid reservoir 6 are communicated by an ascending pipe 5. A lower part of the liquid reservoir 6 provided with cooling fins 7 is communicated with a lower part of the heat absorbing device 1 so as to construct a closed loop heat pipe. The lower part of the ascending pipe 5 is provided with a pushing up means for heat medium for use in winding an electrical heater 8 or installing a pump 9, thereby the heat medium can be circulated in the heat pipe and then the heat can be transferred to the flower radiator.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a heat transfer device for transferring heat from a heat source to a heat utilization destination, and in particular for transferring a heat medium from a lower heat radiator to an upper heat absorber. The present invention relates to a heat pipe type heat transfer device equipped with simple means.

[Prior art] As shown in Figure 2, in conventional heat pipe heat transfer devices, when a loop heat pipe is used, it becomes a gravity reflux type that uses gravity to transport the liquid, so the radiator is closer to the collector than the heat sink. Must be in the upper position.

Therefore, heat can only move from bottom to top.

In the case of the loop heat pipe shown in Figure 3, the vapor pressure of the heat medium is used as a lever and the heat medium is transported to the heat collector located above the radiator using the function of a check valve or float valve. can.

Most solar water heaters collect heat through natural circulation, and a heat collector is installed below the hot water tank. On the other hand, in a solar heat collector, the heat collector is installed on the roof, and a hot water storage tank is provided below the heat collector. Therefore, a means for supplying liquid to the heat collector is required, but a device with a simple configuration is desired in terms of economy, durability, and maintenance.

[Problems to be Solved by the Invention] Among the above-mentioned conventional technologies, as shown in Fig. 2, a loop heat pipe in which a heat radiator and a heat collector are directly connected through piping is limited to the direction of heat transfer from bottom to top. In addition, as shown in Figure 3, in a loop heat pipe in which a heat collector and a heat radiator are connected through piping equipped with a check valve or a float valve, the direction of heat transfer is from top to bottom. Since many float valves are used, failures occur frequently and there are problems with durability.

In both of the above loop heat pipes, when the temperature of the heat collector is higher than that of the heat radiator, heat transfer continues and cannot be stopped.

An object of the present invention is to provide a simple means for transferring heat from an upper heat absorber to a lower heat radiator.

[Means for Solving the Problems] The above object is to provide a heat absorber that vaporizes an inflowing heat medium by heat input from a heat source, and a heat absorber that communicates with an upper part of the heat absorber to guide the vaporized heat medium below the heat absorber. a downcomer pipe, a radiator whose upper part communicates with the downcomer pipe to liquefy the vaporized heating medium and radiate its atrophy latent heat; a lower liquid reservoir which communicates with the lower part of the radiator and holds the liquefied heating medium; A heat pipe is formed by a closed loop consisting of a riser pipe that communicates with the bottom of the lower liquid reservoir and guides the liquefied heat medium upward, and an upper liquid reservoir in which the riser pipe communicates with the upper part and the lower part of the heat absorber communicates with the lower part. This is achieved by arranging a heater at the lower part of the riser pipe.

The above object is achieved by providing a pump in place of the heater at the lower part of the rising pipe and a level switch in the lower liquid reservoir.

The above object is achieved by providing radiation fins in the upper liquid reservoir.

The above object is achieved by providing a solar heat collecting device in which the heat absorber is a solar heat collector and the heat radiator is a heat exchanger provided in a hot water storage tank.

[Function] According to the above configuration, when the heater wound around the lower part of the riser pipe that communicates the lower liquid reservoir and the upper liquid reservoir is energized to heat the heat medium in the riser pipe, a part of the heat medium boils. This generates a vapor flow that pushes the remaining liquid heat transfer medium up into the upper sump.

Alternatively, a pump can be rotated instead of the heater to push the heat medium up into the upper reservoir.

The radiation fins of the upper liquid reservoir cool the upper liquid reservoir, thereby lowering the internal vapor pressure, and increasing the pressure difference between the upper liquid reservoir and the lower liquid reservoir, making it easier to transport the heat medium.

[Example] Embodiments of the present invention will be described with reference to the drawings.

First, the configuration of the embodiment will be explained.

As shown in Fig. 1a, there is a heat absorber 1 above that vaporizes the heat medium by heat input from a heat source, and a downcomer pipe 2 is connected to the upper part of the heat absorber l, and the upper part of the downcomer pipe 2 is connected to the downcomer pipe 2. A heat radiator 3 is provided below the heat absorber 1, and the lower part of the heat radiator 3 communicates with a lower liquid reservoir 4 via a check valve 11, and the bottom of the lower liquid reservoir 4 and the upper part of the upper liquid reservoir 6 are raised. The pipe 5 communicates with the upper liquid reservoir 6, cooling fins 7 are provided in the upper liquid reservoir 6, and the lower part of the upper liquid reservoir 6 and the lower part of the heat absorber 1 communicate with each other to form a closed loop heat pipe.

An electric heater 8 is wound around the lower part of the riser pipe 5.

FIG. 1b shows another embodiment.

A pump 9 is provided in place of the electric heater 8 shown in FIG. 1a at the lower part of the riser f5, and operation and stop are controlled by a level switch 10 provided in the upper liquid reservoir 6.

A similar effect can be obtained by using a solar heat collector that collects solar heat instead of the electric heater 8.

A solar water heating system can be constructed by using a solar heat collector as the heat absorber 1 and using a heat exchanger provided in a hot water storage tank as the radiator 3.

Next, the operation of the embodiment will be explained.

When the electric heater 8 shown in FIG. 1a is not energized, the heating medium in the riser pipe 5 is not heated, so the heating medium does not boil and generate a vapor flow to push the heating medium up into the upper liquid reservoir 6. , the heat medium does not circulate and does not move from the heat absorber 1 to the heat radiator 3.

When the temperature of the heat absorber 1 is higher than the heat radiator 3, when the electric heater 8 is energized, the liquid heat medium in the riser pipe S is heated and a part of it is boiled to generate a steam flow, and the check valve 11 is activated. to prevent backflow to the radiator 3, the remaining liquid heat medium is transferred to the upper liquid reservoir 6.
push up to The heat medium that has flowed into the upper liquid reservoir 6 flows into the heat sink 1 and is heated by the heat source to become steam, passing through the downcomer pipe 2 and flowing into the radiator 3. The vapor heat medium that has flowed into the radiator 3 radiates latent heat of condensation and condenses to become a liquid heat medium. The liquid heat medium flows from the radiator 3 into a lower liquid reservoir 4 provided below the radiator 3, flows from the lower liquid reservoir 4 into the riser pipe 5, and is then transferred to the electric heater 8 again.
The circulation of the liquid being heated and pushed up to the upper liquid reservoir 6 is repeated.

A similar effect can be obtained by pushing the liquid heat medium up to the upper liquid reservoir 6 using a pump 9 provided at the outlet of the lower liquid reservoir 4 of the riser pipe 5 instead of the electric heater 8. The liquid level in the upper liquid reservoir 6 is controlled by operating and stopping the pump 9 using a level switch 10 provided in the upper liquid reservoir 6.

The heat radiation fins 7 of the upper liquid reservoir 6 cool the upper liquid reservoir 6, thereby reducing the internal vapor pressure, and the pressure difference between the upper liquid reservoir 6 and the lower liquid reservoir 4 becomes large. It is effective in some cases.

Further, in the case of a bubble pump, it is desirable that the height difference between the heat absorber 1 and the heat radiator 3 be as small as possible.

As explained above, according to this embodiment, heat can be transferred from the upper heat absorber to the lower heat radiator, and the heat transfer can be controlled by turning on and off the power to the electric heater 8. I can do it.

When collecting solar heat, the electric heater 8 can be easily collected by controlling the electric heater 8 based on the temperature of the heat collector (heat absorber 1) and the temperature of the hot water tank (radiator 3).

[Effects of the Invention] According to the present invention, by providing means for pushing up the liquid heat medium at the lower part of the riser pipe that communicates the upper liquid reservoir and the lower liquid reservoir, heat is transferred between the upper heat absorber and the lower heat radiator. circulate the medium,
Heat can be transferred from the upper heat sink to the lower heat radiator.

[Brief Description of the Drawings] Figure 1a is an explanatory diagram of a configuration according to an embodiment of the present invention, Figure 1b
FIG. 2 is an explanatory diagram of a configuration according to another embodiment of the present invention, FIG. 2 is an explanatory diagram of a configuration according to a conventional technique, and FIG. 3 is an explanatory diagram of a configuration according to another conventional technique. l...Heat absorber, 2...Downcomer pipe, 3...Radiator, 4...
・Lower liquid reservoir, 5... Ascending pipe, 6... Upper liquid reservoir, 7.
...radiating fin, 8...electric heater, 9...pump,
10... Level switch, 11... Check valve 11

Claims (1)

[Claims] 1. A heat absorber that vaporizes an inflowing heat medium by heat input from a heat source; a downcomer pipe that communicates with the upper part of the heat absorber and guides the vaporized heat medium below the heat absorber; a radiator whose upper part communicates with the downcomer pipe and which liquefies the vaporized heating medium and radiates the latent heat of condensation; a lower liquid reservoir which communicates with the lower part of the radiator and holds the liquefied heating medium; and a bottom part of the lower liquid reservoir. A heat pipe is constituted by a closed loop consisting of a riser pipe that communicates with the riser to guide the liquefied heat medium upward, and an upper liquid reservoir in which the riser pipe communicates with the upper part and the lower part of the heat absorber communicates with the lower part. A heat pipe type heat transfer device characterized by having a heater wound around the lower part of the tube. 2. The heat pipe type heat transfer device according to claim 1, characterized in that a pump is provided in place of the heater at the lower part of the riser pipe, and a level switch is provided in the lower liquid reservoir. 3. The heat pipe type heat transfer device according to claim 1 or 2, characterized in that the upper liquid reservoir is provided with radiation fins. 4. The heat absorber according to any one of claims 1 to 3 is a solar heat collector, and the radiator is a heat exchanger provided in a hot water storage tank. A solar heat collector.