JP2003279148A - Pressure reducing type fluid heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure reducing type fluid heating system for reducing the possibility of reducing a heating medium liquid by exhausting pressure- reduced steam together according to extraction of uncondensed gas. <P>SOLUTION: In this pressure reducing type fluid heating system X, a gas component staying vessel 5 for staying a gas component in a pressure reducing vessel 1 is arranged outside the pressure reducing vessel 1, a gas component transfer passage 4 is arranged for transferring the gas component to the gas component staying vessel 5 from the pressure reducing vessel 1, a condensed water circulating passage 6 is arranged for circulating condensed water stored in the gas component staying vessel 5 in the pressure reducing vessel 1, and a staying gas guiding part 7 is arranged for exhausting the gas component staying in the gas component staying vessel 5 in the atmosphere. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a decompression container containing a heat transfer liquid in a decompression chamber maintained at a pressure lower than atmospheric pressure, and the decompression container is passed through a blank space in the decompression chamber. A heat transfer tube for heat exchange piped as described above, and a heat medium liquid heating means for heating a heat medium liquid in the decompression chamber are attached, and with steam generated in the decompression chamber by heating the heat medium liquid. The present invention relates to a decompression type fluid heating device configured to heat a fluid to be heated flowing in the heat transfer tube by heat exchange.

[0002]

2. Description of the Related Art In the case of using such a decompression type fluid heating device, non-condensable gas is generated in the decompression container by heating the heating medium liquid, and air from the outside of the decompression container to the inside. Non-condensable gas will leak in. If the non-condensed gas is not extracted to the outside and is left as it is, the efficiency of the heat exchange deteriorates as time passes. Therefore, conventionally, as shown in FIG. 4, the heat medium liquid L is accommodated in a state where the pressure is lower than the atmospheric pressure, and the heat medium liquid heating means 3 for heating the heat medium liquid L is attached. The heat transfer tube 2 for heat exchange is provided with an opening 1a at the center of the ceiling of the decompression container 1 which is routed through the blank space, and a noncondensable gas or the like is passed through the conduit 4 at the opening 1a. Of the gas storage chamber 5 for storing the above gas and a bleeding pump 7d for discharging the gas stored in the gas storage chamber 5 to the outside are attached, and the staying gas guide unit 7 is used. The decompression container 1
A decompression-type fluid heating device X has been proposed in which the non-condensable gas staying inside is extracted to the outside of the decompression container 1 (see, for example, Patent Document 1).

In the case of controlling the operation of the above decompression type fluid heating apparatus X, the timing of extracting the non-condensable gas is determined by the temperature of the heat transfer medium L and the temperature of the gas in the gas reservoir chamber 5. It is determined when the temperature difference exceeds a predetermined value, and the bleeding operation is performed when the temperature difference exceeds the predetermined value, and the bleeding operation is continued until the temperature difference becomes the predetermined value or less. It was At this time, the temperature of the heat transfer liquid L is measured by the temperature measuring unit 8b, and the temperature of the gas in the gas storage chamber 5 is measured by the temperature measuring units 8c to 8d, and the measurement results are transmitted to the control device 9 to set the predetermined value. It was decided and the bleeding was controlled.

However, in the decompression-type fluid heating device having the above-described structure, the noncondensable gas generated by heating the heat transfer medium L and the noncondensable gas such as air leaking into the decompression container 1 from the outside are generated. Despite the gas extraction by the staying gas guide portion 7, the heat transfer tube 2 is accompanied by the flow of steam (hereinafter, referred to as reduced pressure steam) generated in the decompression chamber by heating the heat transfer medium L. Tended to move around and stay in the vicinity. When the non-condensable gas stays around the heat transfer tube 2, the presence of the non-condensed gas that stays around the heat transfer tube 2 hinders the supply of the reduced pressure steam around the heat transfer tube 2 to cause the transfer of the heat. The heat transfer from the reduced pressure steam to the heated fluid flowing in the heat pipe 2 is significantly hindered.

As described above, since the non-condensable gas tends to stay around the heat transfer tube 2, it becomes difficult for the non-condensable gas to collect in the gas storage chamber 5. Therefore, the stagnant gas guide portion 7 is provided.
However, there was a problem that the extraction efficiency of the non-condensable gas deteriorates. Further, since the staying gas guide portion 7 is provided with a check valve 7e for preventing inflow of non-condensable gas from the outside of the decompression container 1, the check valve 7e serves as resistance during extraction of air. There was a problem that it was not possible to exert sufficient bleeding ability.

In order to solve such a problem, FIG.
As shown in FIG. 5, a part of the periphery of the heat transfer tube 2 is provided along the tube axis direction while wrapping the part while the flow-through part A1 is partially left, and is retained in the part A. Staying gas guide portion 7 that can freely guide the staying gas to the outside of the decompression container 1.
A decompression type fluid heating device X provided with is proposed (for example, refer to Patent Document 2).

With this structure, the non-condensable gas that stays in the vicinity of the heat transfer tube 2 is caused to flow in the axial direction of the tube and moves along the flow. Through the flow-through portion A1
Will be pulled inside. The non-condensed gas that is drawn into the encapsulation body A and stays therein is retained by the staying gas guide portion 7 that is freely guided to the outside of the decompression container 1.
It is guided to the outside and effectively extracted to the outside.

As a result, the non-condensable gas staying in the encapsulation body A easily collects in the staying gas guide portion 7,
It has become possible to construct a decompression type fluid heating device having an excellent extraction efficiency of non-condensable gas by the staying gas guide portion 7. Further, in the configuration described in Patent Document 2 shown in FIG. 5, in order to prevent inflow of non-condensable gas from the outside of the decompression container 1 by providing a solenoid valve such as a three-way valve 7c in the stagnant gas guide portion 7. Therefore, the check valve, which has been a resistance during bleeding, is no longer necessary, and thus a sufficient bleeding ability can be exhibited.

[0009]

[Patent Document 1] Japanese Patent Publication No. 52-47083 (first
(Figure)

[Patent Document 2] Japanese Patent Laid-Open No. 9-119709 (FIG. 1)

[0010]

As described above, in the structure described in Patent Document 1, the time for extracting the non-condensable gas is determined by the temperature of the heat transfer liquid and the temperature of the gas in the gas reservoir. When the temperature difference exceeds a predetermined value, perform bleed operation,
The extraction operation is continued until the temperature difference becomes equal to or less than the predetermined value. Here, when the non-condensable gas covers the temperature sensor part in the temperature sensor part in the gas reservoir, the pressure reducing steam stops flowing and the temperature decreases, causing a temperature difference from the temperature of the heat transfer liquid. And when this temperature difference exceeds a predetermined value, the bleeding operation is performed,
When the set width of the temperature difference is reduced in order to improve the extraction capacity, a hunting phenomenon occurs in which the extraction pump is frequently switched on and off. Further, when the setting range of the temperature difference is increased, the extraction efficiency is reduced because the extraction frequency is reduced. Therefore, it is conceivable that the setting range of the temperature difference is increased and the timer is configured to forcibly discharge the non-condensable gas for a predetermined time when the temperature difference exceeds a predetermined value. However, in this case, although the hunting phenomenon is eliminated and the extraction efficiency is improved, the reduced pressure steam is also discharged together with the non-condensed gas, so that there is a problem that the heat transfer liquid is reduced.

Further, in the structure described in Patent Document 2, a first temperature measuring section 8a for measuring the temperature (first temperature) of the gas component is provided between the heat transfer tube 2 and the stagnant gas guide section 7. In addition, a second temperature measuring unit 8b that measures the temperature (second temperature) of the heat transfer liquid is provided, and gas is removed from the inside of the decompression container 1 based on the temperature difference between the first temperature and the second temperature. Since the control device 9 for performing the extraction operation for extracting for a predetermined time is provided (see FIG. 5), the configuration is the same as the configuration for forcibly discharging the non-condensed gas for a predetermined time by the timer described above. However, since the reduced pressure steam is also discharged together with the non-condensable gas, there is a problem that the heat transfer liquid is reduced.

As described above, when not only the non-condensable gas but also the depressurized vapor inside is discharged and the amount of the heating medium liquid in the depressurization container decreases, it becomes necessary to replenish the heating medium liquid, and eventually it becomes an empty state. As a result, there is a risk that the decompression type fluid heating device will be burnt out.

Accordingly, it is an object of the present invention to provide a decompression type fluid heating apparatus in which the reduced pressure vapor is discharged together with the extraction of the non-condensed gas and the heat medium liquid is reduced.

[0014]

[Means for Solving the Problems] [Structure 1] In order to achieve this object, the characterizing structure of the invention according to claim 1 is that a heat transfer liquid is contained in a decompression chamber maintained at a pressure lower than atmospheric pressure. A decompression container is provided, and for the decompression container, a heat transfer tube for heat exchange that is routed through a blank space in the decompression chamber, and a heating medium liquid heating for heating the heating medium liquid in the decompression chamber. A decompression type fluid heating device configured to heat the fluid to be heated flowing through the heat transfer tube by heat exchange with steam generated in the decompression chamber by heating the heating medium liquid. There, a gas component retention container for retaining the gas component in the decompression container is provided outside the decompression container, and a gas component transfer path for transferring the gas component from the decompression container to the gas component retention container is provided. Stored in ingredient retention container Is provided with a condensed water circulation path for circulating condensed water in the decompression container, and further a staying gas guide part for discharging the gas component staying in the gas component staying container into the atmosphere is provided. The effects are as follows.

[Operation 1] That is, when a gas component retention container for retaining the gas component in the decompression container is provided outside the decompression container, a gas component composed of condensed gas such as non-condensed gas and decompressed vapor is gasified. It can be retained in the component retention container. In addition, when a gas component transfer path for transferring the gas component from the decompression container to the gas component retention container is provided, the gas component in the decompression container is retained from the decompression container by the gas component transfer path. It can be transferred to a container.

At this time, a part of the depressurized steam contained in the gas component becomes condensed water by radiating heat and condensing in the gas component transfer passage when advancing through the gas component transfer passage, and further remains. The non-condensed depressurized vapor is transferred into the gas component retention container and then radiates heat on the wall surface or the like in the gas component retention container to become condensed water. The condensed water thus generated is stored in the gas component retention container. Therefore, when a condensed water circulation path for circulating condensed water stored in the gas component retention container in the decompression container is provided, condensed water stored in the gas component retention container passes through the condensed water circulation path. And can be circulated into the reduced pressure container.

Further, when a staying gas guide portion for discharging the gas component staying in the gas component holding container into the atmosphere is provided, the gas component staying in the gas component holding container is discharged into the atmosphere. can do. At this time, the gas component discharged into the atmosphere is generally a non-condensable gas.
This is because, as described above, the condensed gas is condensed in the gas component transfer path and the gas component retention container to become condensed water, so that it is difficult for the condensed gas to exist as a gas in the gas component retention container. Therefore, since the non-condensable gas that causes a decrease in heat exchange efficiency in the heat transfer tube can be discharged to the outside of the decompression type fluid heating device, the decompressed steam for the heated fluid flowing in the heat transfer tube It becomes possible to prevent the heat transfer from being significantly hindered.

As described above, the gas component composed of the condensed gas such as the non-condensed gas or the reduced pressure vapor is retained in the gas component retention container, the condensed gas is circulated as condensed water in the reduced pressure container, and further discharged into the atmosphere. Since the gas components to be generated are generally non-condensable gases, it is possible to provide a decompression-type fluid heating device in which there is little risk that the decompressed vapor will be discharged into the atmosphere, and therefore the heat medium liquid will lessen. it can. Therefore, the frequency of replenishing the heating medium liquid is reduced, and the risk of thermal burnout due to empty heating is reduced.

Here, in the structure of the decompression type fluid heating apparatus described in the above-mentioned Patent Document 1, a path (conduit) for circulating condensed water condensed in the gas reservoir chamber to the decompression container and a gas component from the decompression container. Path (conduit) for advancing to the gas storage chamber
Is the same as. Therefore, when condensed water is circulated in the decompression container in the conduit, the gas component may become a resistance when advancing to the gas reservoir and the extraction efficiency may be reduced. According to the configuration of the fluid heating device,
A route for circulating condensed water in the decompression container (condensed water circulation path)
Since it is a path different from the path (gas component transfer path) through which the gas component is advected from the decompression container, condensed water when circulating in the decompression container becomes a resistance, and the extraction efficiency is almost likely to be reduced. It will disappear.

[Structure 2] The characteristic structure of the invention according to claim 2 is that in the above structure 1, a cooling means for cooling the gas component transfer path is provided, and the operation and effect thereof are as follows. .

[Effect 2] That is, in the gas component transfer path for transferring the gas component from the decompression container to the gas component retention container, if a cooling means for positively cooling the gas component transfer path is provided, the The reduced pressure steam contained in the components more reliably and efficiently dissipates heat to be condensed water when advancing through the gas component transfer path, and the possibility that the reduced pressure steam is discharged into the atmosphere is further reduced. In addition, the fact that the depressurized vapor is efficiently condensed in the gas component transfer passage means that the length of the gas component transfer passage can be shortened. If the length of the gas component transfer path is shortened, it becomes compact, and further, if the gas component transfer path is shortened, a stagnant gas guide for discharging the non-condensable gas existing in the gas component transfer path to the atmosphere. Can be made compact, and the entire device can be downsized. Even when the entire device is covered with a casing, the entire device can be downsized.

[Structure 3] A characteristic structure of the invention according to claim 3 is that in the structure 1 or 2, one end side of the condensed water circulation passage is connected to the bottom portion of the gas component retention container and the other end side thereof is connected. It is a U-shaped tube which is formed in the decompression container and has a discharge end capable of discharging condensed water, and its action and effect are as follows.

[Effect 3] That is, one end of the condensed water circulation path is connected to the bottom of the gas component retention container and the other end is opened into the decompression container for discharging the condensed water. If it is a U-shaped tube with an end formed,
The condensed water stored in the gas component retention container is supplied to the U
It can flow out from one end side of the character pipe and can be discharged into the decompression container from the discharge end portion on the other end side.

At this time, since the discharge end is open above the lowest portion of the U-shaped pipe, the condensed water flowing into the U-shaped pipe from the gas component retention container is the U-shaped pipe. Condensed water is accumulated from the lowest part to the height of the discharge end. Then, when condensed water flows into the U-shaped tube from the gas component retention container in this state, the condensed water is discharged into the decompression container so as to be extruded from the discharge end formed on the other end side. Condensed water can be circulated in the decompression container.

Further, since the condensed water accumulated in the U-shaped pipe serves as a lid, the gas component in the decompression container does not pass through the gas component transfer path but passes through the U-shaped pipe and the gas component. Since it can be prevented from being transferred to the retention container, the reduced pressure vapor can be reliably transferred to the gas component transfer path and condensed in the gas component transfer path and the gas component retention container. Condensed water can be circulated through the U-tube into the decompression container. for that reason,
Since the depressurized steam can be reliably recovered as condensed water, the effect of preventing the reduction of the heat transfer water can be enhanced.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto. In the drawings, the portions denoted by the same reference numerals as the conventional example indicate the same or corresponding portions. Specifically, this embodiment is used as a hot water supply device used in an inn or the like.

FIG. 1 shows a schematic diagram of a reduced pressure fluid heating apparatus X of the present invention. The decompression-type fluid heating device X is provided with a decompression container 1 containing a heat medium liquid L (specifically, water) in a decompression chamber maintained at a pressure lower than atmospheric pressure.
On the other hand, a large number of heat transfer tubes 2 that are routed through the blank space in the decompression chamber are attached as heat exchange sections. Further, for the decompression container 1,
Heat medium liquid heating means 3 for heating the heat medium liquid L in the decompression chamber (specifically, configured to generate a combustion flame in the combustion chamber arranged to be submerged in the heat medium liquid L). Burner) is installed. Then, the vapor of the heat medium liquid L generated in the decompression chamber by heating the heat medium liquid L by the heat medium liquid heating means 3 and the heated fluid flowing through the heat transfer tube 2 (specifically, The fluid to be heated is heated from the state of cold water to the state of hot water by heat exchange with hot water.

In this embodiment, the decompression container 1 is
The structure which formed the cylindrical part 11 which protruded in the attachment part of the heat transfer tube 2 is illustrated. The cylindrical portion 11 has an opening 1
a is formed, and a nozzle 4a is attached to the decompression container 1 so as to communicate with the opening 1a.
A pipe 4b is provided for connecting and connecting a with a gas component retention container 5 described later. In this way, the gas component transfer path 4 for transferring the gas component from the decompression container 1 to the gas component retention container 5 is composed of the nozzle base 4a and the pipe 4b.

The gas component transferred from the gas component transfer path 4 is once retained in the gas component retention container 5. The gas component is composed of a non-condensed gas or a condensed gas such as depressurized steam, and the depressurized steam dissipates heat mainly in the pipe 4b of the gas component transfer path 4 or on the wall surface of the gas component retention container 5 to condense water. Becomes The condensed water generated at this time can be returned and circulated in the decompression container 1 by a U-shaped pipe 6a which is a condensed water circulation path 6 provided at the bottom of the gas component retention container 5. At this time, the condensed water circulation path 6 is not limited to the U-shaped pipe 6a, but may be applied as long as the condensed water stored in the gas component retention container 5 is circulated in the decompression container 1.

The gas component that is not condensed in the gas component retention container 5 (generally non-condensed gas) is discharged into the atmosphere by the retention gas guide 7. The staying gas guide portion 7 is provided with an extraction pump 7d for discharging the gas component in the gas component staying container 5 to the atmosphere as a component, and is provided between the gas component staying container 5 and the extraction pump 7d. A two-way solenoid valve 7b and a three-way solenoid valve 7c are provided in the middle of a pipe 7a connecting the two.

A first temperature measuring section 8a for measuring the temperature (first temperature) of the gas component is provided between the heat transfer tube 2 and the stagnant gas guide section 7, and the heat transfer medium L A second temperature measuring unit 8b for measuring a temperature (second temperature) is provided, and a gas is predetermined from the inside of the decompression container by the staying gas guide unit 7 based on the temperature difference between the first temperature and the second temperature. A control device 9 is provided for performing a bleeding operation for withdrawing time. Specifically, the first temperature measuring unit 8a is provided at the upper end of the nozzle stub 4a, and the second temperature measuring unit 8b is provided below the surface of the heat transfer liquid L. The control device 9 controls the two-way solenoid valve 7b and the two-way solenoid valve 7b so that the non-condensable gas inside the gas component retention container 5 can be extracted based on the temperature difference between the first temperature and the second temperature. It is configured to control the opening / closing of the three-way solenoid valve 7c and the operation of the extraction pump 7d.

Here, the behavior of the gas components and the like when the decompression type fluid heating apparatus X of the present invention having the above structure is operated will be described in detail. By heating the heat medium liquid L by the heat medium liquid heating means 3, a reduced pressure vapor or a non-condensable gas which is a gas component is generated. The gas component generated at this time moves around the heat transfer tube 2 and stays in the vicinity thereof. Here, in general, the gas component collects in the low-pressure region in the decompression container 1. In this case, the low-pressure portion is near the heat transfer tube inlet portion 21 into which the fluid to be heated flows in the heat transfer tube 2. This is because the fluid to be heated in the vicinity of the heat transfer tube inlet portion 21 is the coldest part in the decompression container 1 because heat exchange has not yet been performed so much, and therefore, the heat transfer is performed. The pressure in the vicinity of the heat pipe inlet 21 becomes the lowest pressure site in the decompression container 1.

The gas components collected in the vicinity of the heat transfer tube inlet 21 move to the nozzle stub 4a having a lower temperature (that is, lower pressure) than in the vicinity of the heat transfer tube inlet 21. That is, the nozzle 4a serves as a part for collecting the gas component. The temperature of the gas component (first temperature) measured by the first temperature measuring unit 8a provided at the upper end of the nozzle 4a and the temperature of the heat transfer liquid L are set below the water surface. If a temperature difference (second temperature) of the heat transfer liquid L measured by the second temperature measuring unit 8b exceeds a certain temperature difference, the control device 9
The bleed air for discharging the gas component into the atmosphere is started by the staying gas guide portion 7 according to the command of the above. At this time, a part of the reduced pressure steam contained in the gas component flows through the pipe 4b. When advancing, it radiates heat in the pipe 4b and condenses to become condensed water. Further, the remaining decompressed vapor is transferred to the gas component retention container 5 and then on the wall surface of the gas component retention container 5 or the like. It radiates heat and becomes condensed water. The condensed water thus generated is stored in the gas component retention container 5. In addition, as described above, the gas component retention container 5
Since the condensed water stored in (1) can be circulated to the decompression container 1 by the U-shaped pipe 6a, it is possible to prevent the heat medium liquid L from decreasing.

At this time, as shown in FIG. 2, the U-shaped pipe 6a has one end connected to the bottom of the gas component retention container 5 and the other end opened into the decompression container 1 for condensation. A discharge end 6b capable of discharging water is formed, and the discharge end 6b is open above the lowest portion 6c of the U-shaped pipe 6a. Therefore, the condensed water that has flowed into the U-shaped pipe 6a from the gas component retention container 5 accumulates from the lowest portion 6c of the U-shaped pipe 6a to the height of the discharge end 6b. . In this state, when condensed water flows from the gas component retention container 5 into the U-shaped pipe 6a, condensed water is extruded from the discharge end 6b formed on the other end side in the decompression container 1. The condensed water discharged to the inside can be circulated in the decompression container 1.

Since the reduced pressure steam which is the condensed gas is condensed to condensed water in this manner, the gas component retained in the gas component retention container 5 is substantially a non-condensed gas.
Therefore, the gas component discharged into the atmosphere by extracting the gas in the staying gas guide portion 7 becomes a substantially non-condensed gas, the reduced pressure steam is less likely to be discharged into the atmosphere, and the heat transfer liquid is reduced. The risk of being lost is reduced.

At this time, as a method of controlling the extraction air by the control device 9, for example, the temperature inside the decompression container 1 is set to 75.
When the difference between the first temperature and the second temperature becomes equal to or higher than a predetermined temperature (20 ° C.) at a temperature equal to or higher than 0 ° C., the accumulated gas guide portion 7 performs the extraction for 30 seconds, and the extraction for 30 seconds ends. After that, if the temperature difference between the first temperature and the second temperature is detected again and the temperature is equal to or higher than the predetermined temperature, the air extraction is performed again. By repeating this, when the temperature difference between the first temperature and the second temperature becomes equal to or lower than the predetermined temperature, the extraction is ended.

Next, a decompression type fluid heating apparatus X according to another embodiment of the present invention will be described with reference to FIG.
However, in order to avoid redundant description, the parts described in the previous embodiment and the parts having the same operation are denoted by the same reference numerals, and the description thereof will be omitted. A configuration different from the previous embodiment will be mainly described.

In the depressurization type fluid heating apparatus X according to this another embodiment, the entire apparatus is covered by a casing 22, and a fan 23 for supplying combustion air to a burner as a heating medium liquid heating means 3 is provided. The suction port is arranged in the casing 22 with the suction port opening into the casing 22. In the casing 22, the gas component transfer path 4
The outside air suction opening portion 22a is provided in the vicinity of the pipe 4b that constitutes the outside air suction opening portion 2
It is configured to be sucked into the casing 22 from 2a, to flow while cooling the gas component transfer path 4, particularly the pipe 4b, and to be sucked from the suction port of the fan 23. In other words, the air-cooling type cooling means 24 is constituted by the fan 23 that supplies combustion air to the burner, the outside air suction opening 22a of the casing 22, and the like, and actively cools the gas component transfer path 4 to generate the reduced pressure steam. Condensation is promoted, thereby shortening the gas component transfer path 4. For example, pipe 4
If the surface temperature of b is 86 ° C. and the ambient temperature of the pipe 4b is 60 ° C., the generated amount of condensed water per meter of the pipe is 0.3 liter / min, while the ambient temperature of the pipe 4b is 20 ° C. By cooling to 0 ° C., the amount of condensed water generated per meter of pipe becomes 1.0 liter / min. By providing the cooling means 24, it is possible to expect generation of condensed water three times or more.

Various modifications can be made to the cooling means 24. For example, the suction port of the fan 23 is opened to the outside of the casing 22, and as shown by a phantom line in FIG.
It is also possible to connect an air cooling pipe 25 near the discharge port of the fan 23 and guide a part of the combustion air to the gas component transfer passage 4 to cool the gas component transfer passage 4. In that case, the fan 23 and the air-cooling pipe 25 constitute an air-cooling type cooling means 24, and in any case, the pipe 4b or the nozzle base 4a constituting the gas component transfer path 4 is air-cooled. Fins can be provided. Further, the cooling means 24 is not particularly limited to an air cooling type, and for example, a water cooling type cooling device can be provided. In the present specification, various cooling devices such as an air cooling type and a water cooling type are included. "Cooling means".

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a decompression type fluid heating apparatus of the present invention.

FIG. 2 is a schematic view of a main part of a decompression type fluid heating device of the present invention.

FIG. 3 is a schematic cross-sectional view of a reduced pressure fluid heating device according to another embodiment of the present invention.

FIG. 4 is a schematic sectional view of a conventional decompression type fluid heating device.

FIG. 5 is a schematic sectional view of a conventional decompression type fluid heating device.

[Explanation of symbols]

1 decompression container 2 heat transfer tubes 3 Heat medium liquid heating means 4 Gas component transfer path 5 Gas component retention container 6 Condensed water circuit 7 Retained gas guide 24 Cooling means L heat transfer liquid

Claims (3)

[Claims] 1. A decompression container containing a heat transfer liquid is provided in a decompression chamber maintained at a pressure lower than atmospheric pressure, and heat is piped to the decompression container through a blank space in the decompression chamber. A heat transfer tube for exchange and a heat medium liquid heating means for heating the heat medium liquid in the decompression chamber are attached, and the heat transfer with the steam generated in the decompression chamber by heating the heat medium liquid causes the transfer of heat. A decompression type fluid heating device configured to heat a fluid to be heated flowing in a heat pipe, wherein a gas component retention container for retaining a gas component in the decompression container is provided outside the decompression container, A gas component transfer path for transferring the gas component from the decompression container to the gas component retention container is provided, and a condensed water circulation path for circulating condensed water stored in the gas component retention container in the decompression container is provided. Gas component retention The gas component staying in the container vacuum fluid heating device is provided with a residual gas guiding portion for discharging into the atmosphere. 2. The reduced pressure fluid heating apparatus according to claim 1, further comprising cooling means for cooling the gas component transfer passage. 3. The condensed water circulation path has one end side connected to the bottom of the gas component retention container and the other end side that opens into the decompression container and forms a discharge end capable of discharging condensed water. The reduced pressure fluid heating apparatus according to claim 1 or 2, which is a U-shaped tube.