JPH0370134B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat transfer device that transfers heat from a heating section to a heat radiating section without installing a pump or the like.

BACKGROUND TECHNOLOGY This type of heat transfer device, as shown in FIG.
The heat medium liquid containers 1 and 2 arranged above and below are connected through two communication passages 3 and 4, one of which communication passages 3 communicates the lower part of the upper container 1 with a part of the lower container 2. A check valve 5 is interposed in the middle, and the other communication path 4 communicates a part of the upper container 1 with the vicinity of the upper part of the lower container 2, and a radiator 6 is interposed in the middle to achieve airtight manufacturing. None, a heating device 7 is provided corresponding to the lower container 2,
The structure is such that liquid level detectors 8 are provided at two points, upper and lower, in the lower container 2, and a control mechanism 9 is provided that controls the heating device 7 based on the signals from the liquid level detectors 8. The heat medium liquid stored in is heated, and due to its vapor pressure, the heat medium vapor passes through the communication path 4, radiates heat in the radiator 6 interposed in the middle, and condenses, becoming a heat medium liquid and discharging it into the upper container 1. It can be stored in As the heating continues, the level of the heat medium liquid in the lower container 2 decreases and when it reaches the lower detection position of the liquid level detector 8, the control mechanism 9 stops the operation of the heating device 7. Heating stops and lower container 2 cools down.
When the steam in the tank drops, the heat transfer liquid stored in the upper container 1 returns to the lower container 2 through the communication path 3 and the check valve 5 interposed in the middle due to gravity and atmospheric pressure. , when the liquid level in the lower container 2 rises and reaches the upper detection position of the liquid level detector 8, the control mechanism 9
The operation of the heating device 7 is started in a cycle in which heat is exchanged with the heat medium liquid using latent heat.

Problems to be Solved by the Invention However, with the above configuration, when a substance such as water that has a high boiling point and becomes liquid at room temperature is used as the working medium, deaeration is performed first to maintain the closed system in a reduced pressure state. However, as time passes, air enters the closed system due to slow leakage, lowering the degree of pressure reduction, reducing heat transfer performance, and causing the internal pressure to rise abnormally. There have been problems in that the working medium evaporates and is reduced in weight, and oxidative corrosion due to dissolved oxygen is accelerated.

The present invention solves such conventional problems,
The purpose of this system is to provide a means for automatically exhausting air that has entered the closed system so that heat can be transferred stably at all times.

Means for Solving the Problems In order to solve the above problems, the heat transfer device of the present invention includes a heating section that generates steam, a heat radiating section, a temperature detecting means for detecting the temperature inside the heating section, and a heat radiating section. Or, it is equipped with a closed circulation circuit consisting of an exhaust means that is installed at a position in the path after the heat radiation part where non-condensable positive gas accumulates and is set to operate at a constant pressure slightly higher than atmospheric pressure, and the heating part temperature and a heat input control means that stops or reduces the heat input to the heating section by activating the temperature detection means when the corresponding saturation pressure reaches a temperature value equal to or higher than the operating pressure of the exhaust means. .

Effects According to the present invention, with the above-described configuration, the heat medium liquid is heated in the heating section to cause boiling, and steam is generated. The generated steam reaches the heat dissipation section, radiates heat and condenses, and the liquefied heat transfer liquid returns to the heating section through the path and evaporates again. Heat is transferred by repeating the cycle, but the boiling heat transfer coefficient In order to improve the condensation heat transfer coefficient and to prevent the loss of weight due to evaporation and dissipation of the heat transfer liquid, the system is sealed, and the system is degassed and depressurized at the initial stage, and the heat transfer liquid is sealed. When the heat transfer liquid is water or the like, there will be negative pressure in the room temperature system, and after a long period of time, a slow leak of air will occur.
Non-condensable gases such as air that have entered a closed system are
It is swept away by the vapor stream evaporated in the heating section and remains in the stagnation space after the radiator, causing a decrease in heat transfer coefficient and an increase in internal pressure. When the internal pressure rises and exceeds a certain pressure slightly higher than atmospheric pressure, the exhaust means installed at the heat radiation part or in the path after the heat radiation part where non-condensable gas stagnates operates, and removes the stagnant non-condensable gas. Excrete gradually. Here, when the internal pressure rises, the temperature in the heating section also rises, and if the amount of heat input is too large, the temperature of the heating section increases more than the internal pressure decrease and temperature drop due to noncondensable gas discharge, but the temperature detection means When a temperature value exceeding the operating pressure of the exhaust means is detected, the heat input control means is controlled to stop or reduce the heat input to the heating section, and the exhaust means successfully completes the discharge of noncondensable gas. can be done. As a result, the pressure and temperature of the heating section return to normal conditions, allowing heat to be transferred with stable performance over a long period of time.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, 10 is a heating section, which includes a heat source 11 such as a heater, a heat exchanger 12, and a heat exchanger 12.
and a gas-liquid separator 13 disposed above and in communication with the gas-liquid separator 13. A heating tank 14 is disposed approximately midway between the heat exchanger 12 and the gas-liquid separator 13, and the lower parts of the heating tank 14 and the heat exchanger 12 are connected to each other by a liquid supply pipe 15, so that the gas A part of the liquid separator 13 and the upper part of the heating side tank 14 are connected through a communication pipe 16 to form a heating side block 17. The upper part of the heat radiation part 18 and the upper part of the gas-liquid separator 13 are connected to each other by a steam pipe 19. The closed type heat radiation side tank 20 is provided above the heating side tank 14, and the vicinity of its upper part is connected to the lower part of the heat radiation part 18 and the liquid pipe 21.
An appropriate amount of evaporative heat medium such as water is sealed inside after degassing and depressurization, creating a sealed structure. The vicinity of the lower part of the heat radiation side tank 20 and the upper part of the heating side tank are communicated by a bypass pipe 23 in which a check valve 22 is interposed.

The check valve 22 has a structure that stops the flow of the heat medium liquid from the heating side tank 14 to the heat radiation side tank 20, and is a valve with low flow resistance in the forward direction. Even if this valve is an on-off valve configured to be driven in correlation with the liquid level of the heating side tank 14 or the heat radiation side tank 20, the effect will not change in any way. Heated tank 1
4 is a level detection means 24 for detecting the internal liquid level.
a, 24b, and an on/off control means 25 that controls on/off of the heat source 11 based on this signal etc.
is provided. Level detection means 24a, 24
Even if b is arranged in the heat radiation side tank 20, its purpose does not change in any way. A temperature detection means 26 is provided in a part of the heat exchanger 12, and a heat input control means 27 is provided which controls the heat input to the heat source 11 based on this signal. At the top of the heat radiation side tank 20, an exhaust means 28 is provided which is set to operate at a pressure slightly higher than atmospheric pressure, and when the operating pressure reaches a saturation temperature or higher, the heat input control means 27 is activated. It is set.

In the above configuration, the heat medium liquid in the heat exchanger 12 is heated by the movement of the heating unit 10, and when it starts to evaporate, it becomes bubbles and reaches the gas-liquid separator 13, where the heat medium vapor separated into gas and liquid becomes vapor. It passes through the tube 19 and reaches the heat radiation section 18 . This heat radiating section 18 radiates the latent heat of condensation, and the heat medium vapor liquid condenses to become a heat medium liquid, and the liquid pipe 2
1 and reaches the heat radiation side tank 20. Heating section 10
When steam is sent out and the heat medium liquid decreases, the heat medium liquid is supplied from the heating side tank 14 through the liquid supply pipe 15, and normal operation is maintained.
During this time, the heat medium liquid level in the heating side tank 14 gradually decreases. Finally, the liquid level in the heating side tank 14 decreases, and the lower level detection means 24
When detected by b, the control means 25 stops the operation of the heat source 11 of the heating section 10. When the heating stops and the heating block 17 is cooled, the heat medium vapor inside condenses and the internal pressure decreases. As the internal pressure of the heating block 17 continues to decrease, the bypass pipe 23
When the pressure on the heating side block 17 side of the check valve 22 installed in The liquid begins to return to tank 14. As the liquid continues to return, the liquid level in the heating side tank 14 rises, and when detected by the upper level detection means 24a, the heat source 11 of the heating section 10 is started by the control means 25, and this cycle is started. The heat of the heating section 10 is repeatedly conveyed to the heat radiation section 18.

Here, after a long period of time, a slow leak of air occurs due to the negative pressure inside the closed system, and the air that has entered the system is swept away by the steam flow evaporated in the heating section 10 and passes through the heat dissipation section 18 to radiate heat. side tank 2
0, causing an increase in the internal pressure of boiling and a decrease in the condensation heat transfer coefficient. Internal pressure increases,
When a certain pressure set slightly higher than atmospheric pressure is exceeded, the exhaust means 28 is activated and the non-condensable gas accumulated in the upper part of the heating side tank 20 is gradually exhausted.
Here, when the internal pressure increases, the temperature in the heating section 10 also increases, and if the amount of heat input is too large, the temperature of the heating section 10 increases beyond the internal pressure decrease and temperature drop due to noncondensable gas discharge, but the temperature detection Means 2
6 detects a temperature value exceeding the operating pressure of the exhaust means 28, the heat input control means 27 is controlled to stop or reduce the heat input to the heating section 10, and the exhaust means 28 prevents non-condensing. The gas discharge can be completed normally. As a result, the heating pressure and temperature return to normal conditions, and the effect is that heat can be transported with stable performance over a long period of time.

Effects of the Invention As described above, the heat transfer device of the present invention provides the following effects.

(1) Since the exhaust means is provided at the location where non-condensable gas accumulates in the closed system, non-condensable gas can be reliably discharged, the heat transfer coefficient in the system can be prevented from decreasing, and the internal pressure can be reduced. This has the effect of preventing abnormal increases in .

(2) A heat input control means is provided which stops or reduces heat input to the heating section by activating the temperature detection means when the saturation pressure corresponding to the temperature of the heating section reaches a temperature value equal to or higher than the operating pressure of the exhaust means. Therefore, even if the amount of heat input is too large and the temperature of the heating section increases to exceed the internal pressure decrease and temperature drop due to non-condensable gas discharge, the heat input to the heating section is controlled and the exhaust means prevents non-condensing. This has the effect that the discharge of the gas can be completed normally, the pressure and temperature of the heating section can be returned to the normal state, and heat can be transported with stable performance over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a heat transfer device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional heat transfer device. 10... Heating part, 18... Heat radiation part, 19... Steam pipe, 20... Heat radiation side tank, 21... Liquid pipe, 2
2...Check valve, 23...Return pipe, 26...Temperature detection means, 27...Heat input control means, 28...Exhaust means.

Claims (1)

[Claims] 1. A heating section that generates steam, a heat radiation section, a temperature detection means that detects the temperature inside the heating section, and a heating section that is provided at a position where noncondensable gas accumulates in the heat radiation section or in the path after the heat radiation section, and an exhaust means set to operate at a constant pressure slightly higher than that of the exhaust means, and when the saturation pressure corresponding to the temperature of the heating section reaches a temperature value equal to or higher than the operating pressure of the exhaust means, A heat transfer device comprising a heat input control means for stopping or reducing heat input to the heating section by operating a temperature detection means.