JPH03211392A - heat transfer device - Google Patents

Abstract

PURPOSE:To maintain the pressure inside a hermetically sealed circuit above the ambient pressure, thereby prevent the outside air from generating into the circuit and prevent corrosion, by sealing a heat transfer medium having a boiling point higher than normal temperature and a noncondensable gas in the hermetically sealed circuit. CONSTITUTION:A heater 1 and a radiator 2 are connected to each other by a forward pipe 3 and a backward pipe 4 to constitute a loop form, hermetically sealed circuit. A volatile heat transfer medium 5 such as flon (e.g. R11 or R123) and water is sealed in the circuit as a heat transfer medium having a boiling point higher than normal temperature, and nitrogen 9 is sealed in the circuit as a noncondensable gas. At non-heating times, the heat transfer medium 5 in the heater 1 is present in a liquid state, whereas nitrogen 9 in the circuit is present in a gaseous state, whereby the pressure inside the circuit is maintained above the ambient pressure. It is thereby possible to prevent the penetration of the outside air, which would cause corrosion, to stabilize the distribution of the heat transfer medium 5 in this device, and to prevent an abnormal temperature rise from occurring in the heater 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat transfer device used in a heating/cooling air conditioner and an exhaust heat recovery device.

2. Description of the Related Art Conventionally, this type of heat transfer device has a configuration as shown in FIG. constitutes a sealed circuit,
A volatile heat medium 5 was sealed inside. Furthermore, the radiator 2 connects the upper header 6 and the lower header 7 with a plurality of vertical channels 8, and also connects the outgoing pipe 3 and the upper header 6 and the incoming pipe 4 and the lower rudder 7. The structure was such that the pipes were connected to positions facing both sides of the radiator.

Problems to be Solved by the Invention However, in such a conventional configuration, when the heat medium 5 with a high boiling point is used to obtain a high temperature, when the temperature of the heat medium 5 falls below the boiling point, the inside of the closed circuit is There was a problem in that the pressure became negative and outside air and corrosive gases entered through the piping seals, causing corrosion of the equipment. Furthermore, if the amount of heating or heat dissipation changes rapidly, the distribution of the heat medium 5 within the device will change dramatically, resulting in a shortage of heat medium 5 in the heater 1, and the temperature of the heater 1 will become abnormal. There was also the issue of rising prices.

The present invention solves this yA problem by constantly maintaining a positive pressure inside the closed circuit, preventing the intrusion of outside air that causes corrosion, and stabilizing the distribution of the heat medium within the device.
The purpose is to prevent an abnormal rise in temperature within the heater.

Means for Solving the Problem In order to solve this problem, the present invention configures a closed circuit with a heater, a radiator, an outgoing pipe, and a returning pipe, and contains a heat medium having a boiling point higher than normal temperature and a non-condensing circuit. Furthermore, the radiator is provided with a plurality of vertical flow paths connecting the upper header and the rudder to the lower part, and the connecting part between the outgoing pipe and the rudder to the upper part, the return pipe and the rudder to the lower part. The connection part with the radiator is provided in the same direction on one side of the radiator.

Effect: With this configuration, even if the heat medium in the heater falls below its boiling point when not heated, the space is filled with non-condensable gas, and the pressure inside the sealed circuit is higher than the outside pressure, that is, the pressure is always maintained at positive pressure. This prevents outside air and corrosive gases from entering the inside. Furthermore, during heating, a large amount of heat medium is generated and the pressure inside the closed circuit increases, so the volume of the non-condensable gas is reduced according to the pressure, and the space is mostly occupied by the heat medium gas. becomes. Therefore, even if a sudden change occurs in the amount of heating or the amount of heat dissipation, the volume change of the non-condensable gas prevents a sudden change in the distribution of the heating medium and prevents an abnormal temperature rise in the heater.

On the other hand, since the outgoing pipe connection to the upper header of the radiator and the return pipe connection to the lower header are installed in the same direction, non-condensable gas is routed to the vertical passage on the opposite side of the radiator connection. Accumulated non-condensable gas will not be distributed throughout the closed circuit and impede heat transfer, and stable heat transfer will be possible.

Embodiment FIG. 1 is a configuration diagram of a heat transfer device according to an embodiment of the present invention. In FIG. 1, a heater 1 and a radiator 2 are connected to an outgoing pipe 3.
It is connected by a return pipe 4 to form a loop-shaped sealed circuit, and inside is a heating medium with a boiling point higher than normal temperature, such as fluorocarbons such as R11 or R123, or a volatile heating medium 5 such as water, and a non-condensable heating medium 5. Nitrogen 9 is sealed as a reactive gas.

On the other hand, the radiator 2 is composed of a plurality of vertical passages 8 that connect the upper header 6 and the lower header 7, the connecting part between the outgoing pipe 3 and the ladder 6 to the upper part, and the connecting part between the lower header 7 and the returning pipe 4. The connecting portions are provided in the same direction on one side of the radiator.

In the above configuration, the heat medium 5 in the heater 1 when not heating exists in a liquid state, and the nitrogen 9 exists in a gaseous state in the space of the closed circuit, and the pressure inside the closed circuit is higher than the outside pressure. It is maintained at high pressure. On the other hand, during heating, the heat medium 5 in the heater 1 evaporates, and as the pressure inside the circuit increases, the volume of the nitrogen 9 is reduced, and eventually it is opposite to the connection part between the outgoing pipe 3 and the returning pipe 4 of the radiator 2. It will be accumulated on the side. Therefore, the refrigerant evaporated in the heater 1 passes through the outgoing pipe 3 without being hindered by the nitrogen 9 and is condensed in the radiator 2, and the liquefied heat medium 5 passes through the return pipe 4 and returns to the heater 1 by the action of gravity. , is heated again, and heat transfer is performed by circulating the heat medium 5. On the other hand, 2. When a drastic change occurs, the distribution of the heating medium 5 within the device changes in response to the pressure fluctuation, but at this time, the internal pressure changes slowly as nitrogen 90 volumetric expansion and contraction occur. It is possible to prevent sudden changes in the distribution of

Note that the same effect can be obtained even when the return pipe 4 is provided with a heat transfer means such as a pump.

Effects of the Invention As is clear from the description of the embodiments above, the present invention provides the following effects.

(1) Since a heat medium with a boiling point higher than room temperature and a non-condensable gas are sealed in the sealed circuit, the pressure inside the sealed circuit is always kept higher than the outside pressure, preventing the intrusion of outside air and preventing corrosion. It can be prevented.

(2) The volume of the non-condensable gas expands or contracts as pressure fluctuates in the closed circuit, and by having a buffering effect against pressure fluctuations, the distribution of the heat medium can be kept stable, and the temperature of the heater can be maintained. Abnormal increases can be prevented.

(3) Since the outgoing and return pipe connections to the radiator are installed in the same direction, non-condensable gas is accumulated on the opposite side of the connection, providing stable heat without interfering with the circulation of the heat medium. Transport can be carried out.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a heat transfer device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional heat transfer device. 1... Heater, 2... Heat radiator, 3...
... Outgoing pipe, 4... Return pipe, 5... Heat medium, 6... Upper header, 7... Lower header, 8... ...Vertical flow path, 9...Non-condensable gas.

Claims (2)

[Claims] (1) A loop shape comprising a heater, a radiator, an outgoing pipe and a return pipe that connect the heater and the radiator, the heater, the radiator, the outgoing pipe, and the return pipe. A heat transfer device in which a heat medium with a boiling point higher than room temperature and a non-condensable gas are sealed in a closed circuit. (2) A radiator comprising an upper header, a lower header, and a plurality of vertical channels connecting the upper header and the lower header, the connecting portion between the upper header and the outgoing pipe; The heat transfer device according to claim 1, wherein a connecting portion between the lower header and the return pipe is located in the same direction on one side of the radiator.