JP3810239B2 - Vacuum water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a storage unit for storing the heat transfer fluid at the bottom of the can body whose inside is a vacuum space, and a heating unit for heating the heat transfer solution stored in the storage unit to generate medium vapor; The present invention relates to a vacuum water heater provided at the top of the can body and provided with a hot water circulation pipe for circulating water.
[0002]
[Prior art]
As shown in FIG. 4, the vacuum water heater includes a can body 10 in which a heat medium liquid (heat medium water) is sealed and the inside is in a vacuum, that is, a reduced pressure state, and a heat medium water in a lower portion of the can body 10. It has a combustion chamber 32 disposed in an immersed state, and is disposed in a vacuum space in the can 10 and includes a hot water circulation pipe 40 through which water is circulated.
One end of the combustion chamber 32 is open to the outside of the can 10, and a burner 31 using various gaseous fuels or various liquid fuels as fuel is disposed in the opening. The other end of the combustion chamber 32 is provided with a flue for discharging combustion exhaust gas accompanying combustion of the burner 31 from the combustion exhaust gas discharge port 33.
[0003]
In this vacuum water heater, when the burner 31 is operated, the heat transfer water in the can 10 is heated, and the heated heat transfer water evaporates and rises to reach the vacuum space of the can 10 so that water vapor is generated. The heat transfer water liquefied by radiating heat to the water flowing inside the hot water circulation pipe 40 on the surface of the hot water circulation pipe 40 and flowing down downward by gravity.
And the warm water circulation pipe 40 is heated by the latent heat by the phase change of water vapor | steam, and thereby the water which flows through the warm water circulation pipe 40 is heated, and is sent out for hot water supply or heating.
[0004]
Now, when a combustion system such as an incinerator is installed in the vicinity of the above-described vacuum hot water machine, the heat stored in the bottom of the can body 10 using the thermal energy of the high-temperature exhaust gas discharged from the combustion system. When heating the medium, heating energy may be saved.
[0005]
The vacuum water heater that heats the heat transfer water using the exhaust gas enables the exhaust gas discharged from the combustion system to exchange heat with the heat transfer water stored in the storage section 20 inside the can body 10. The exhaust gas passage through which the exhaust gas circulates is configured to be able to pass through the heat transfer water stored in the storage unit 20.
[0006]
Here, when the operation of the vacuum water heater is stopped, the ignition of the burner 31 is only stopped in order to prevent the water in the hot water circulation pipe 40 from exchanging heat with the heated medium vapor. Naturally, it is necessary to stop the heat exchange of the exhaust gas with the heat transfer water stored in the storage unit 20.
Therefore, in such a case, the exhaust gas pipeline is configured to be switchable so that the exhaust gas from the combustion system can be discharged by another route without passing through the heat transfer water stored in the storage unit 20. In addition, a plurality of dampers are provided in the exhaust gas pipe along with the pipe switching. As shown in FIG. 4, the vacuum water heater includes a first exhaust pipe 81 that discharges exhaust gas from the combustion system to an exhaust gas cleaner outside the combustion system, and a first branch in the middle of the first exhaust pipe 81. The second exhaust gas that branches off at the section B1, passes through the heat transfer water stored in the storage section 20 in the can 10 of the vacuum water heater, and joins the first exhaust pipe 81 again at the second branch section B2. A conduit 82, a damper D3 between the first branch B1 and the second branch B2, a damper D1 between the first branch and the vacuum water heater, and the second branch And a damper D2 between the vacuum water heater and the vacuum water heater. In the operation stop state, the exhaust gas from the combustion system can be directly discharged out of the combustion system without passing through the heat transfer water stored in the storage unit 20 in the can 10 of the vacuum water heater. The damper D1 and the damper D2 are closed, and the damper D3 is opened.
[0007]
[Problems to be solved by the invention]
However, when the temperature of the exhaust gas flowing in the exhaust gas pipe is high, it may reach about 500 ° C., and if high temperature exhaust gas leaks, it is extremely dangerous. In addition, the leakage of exhaust gas is highly likely to occur from a damper part provided in the exhaust gas pipe line, and the design of the damper part provided in the exhaust gas pipe line is required to have high airtightness. Furthermore, the properties of the exhaust gas discharged from the combustion system may vary depending on the properties of the object being combusted, and corrosive gas may be generated. There was a need to prevent.
In order to ensure the airtightness of the damper part of the exhaust gas pipe line, it is necessary to periodically inspect, leading to an increase in running cost. In addition, manufacturing a highly airtight damper portion has led to an increase in the manufacturing cost of the vacuum water heater.
[0008]
Then, the objective of this invention is discharged | emitted from a combustion system, being able to save the heating energy at the time of heating the heat-medium water stored by the can body bottom part using the waste gas discharged | emitted from a combustion system. It is an object of the present invention to provide a vacuum water heater that can prevent exhaust gas leakage with a simple structure without providing a complicated switching structure and a damper portion.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a vacuum hot water machine according to the present invention comprises a can body having an internal vacuum space, and hot water that is provided at the top of the can body and that circulates water. Vacuum hot water having a flow pipe, a reservoir provided at the bottom of the can, and storing the heat transfer fluid, and a heating unit that heats the heat transfer fluid stored in the storage and generates medium vapor A heat transfer pipe through which exhaust gas circulates in the vacuum space inside the can body, a heat transfer liquid supply section for supplying a heat transfer liquid to the heat transfer pipe, and a heat transfer medium supply section A heat medium liquid supply control unit for controlling the presence or absence of the heat medium liquid supply is provided.
[0010]
In order to achieve the above object, the vacuum hot water machine according to the present invention is characterized in that, as described in claim 2, in the invention according to claim 1, the heat medium liquid supply part is a heat medium liquid of the storage part. Is supplied to the heat transfer tube.
[0011]
In order to achieve the above object, a vacuum hot water machine according to the present invention, as described in claim 3, exchanges heat with water flowing through the hot water circulation pipe in the invention of claim 1, according to claim 1. A condensing heat medium liquid receiving tray capable of storing the heat medium liquid generated by condensation is provided below the hot water circulation pipe, and the heat medium liquid supply section is stored in the condensing heat medium liquid receiving dish. A second spraying device that sprays and supplies the heat transfer fluid to the heat transfer tubes.
[0012]
[Action]
The medium heat is generated by heating the heat medium liquid stored in the bottom of the can body by the heating unit, thereby exchanging heat between the water flowing through the hot water circulation pipe provided at the top of the can body and the medium vapor. be able to. Then, a heat transfer pipe for circulating the exhaust gas from the combustion system different from the heating unit is provided in the vacuum space inside the can body, and control for supplying the heat transfer fluid from the heat transfer liquid supply unit to the heat transfer tube is performed. By performing in the liquid supply control unit, heat exchange between the heat medium liquid and the exhaust gas becomes possible and the temperature of the heat medium water is raised by heat exchange, so that the heat energy of the heating unit can be saved.
[0013]
When heat exchange between the exhaust gas flowing through the heat transfer tube and the heat transfer fluid is not performed, the heat transfer fluid supply control unit performs control not to supply the heat transfer fluid from the heat transfer fluid supply unit to the heat transfer tube. In such a case, since the flow path of the heat transfer tube through which the exhaust gas flows is not switched, there is no possibility of exhaust gas leakage from the damper portion due to the provision of the flow path switching portion.
[0014]
In addition, since the heat of the exhaust gas in the heat transfer tube is difficult to conduct through the vacuum space, the exhaust gas is temporarily passed through the heat transfer tube by stopping the supply of the heat medium liquid from the heat medium liquid supply unit to the heat transfer tube. Even if it circulates, the temperature of the water that circulates inside the hot water circulation pipe is hardly raised. Here, the vacuum means a reduced pressure state.
[0015]
In the case where the heating medium liquid supply unit is a first spraying device that sprays and supplies the heating medium liquid in the storage unit to the heat transfer pipe, the heat transfer fluid is sprayed by the first spraying device in the sprayed state. Since it is sprayed on the heat pipe, the heat transfer liquid can be immersed in the entire heat transfer pipe without being biased, and as a result, heat exchange between the exhaust gas flowing in the heat transfer pipe and the heat transfer liquid can be performed accurately. is there.
[0016]
The medium vapor comes into contact with the hot water flow pipe and exchanges heat with the water flowing through the hot water flow pipe, so that the medium vapor condenses and returns to the heat transfer liquid again. By providing it below the pipe, it is possible to store the heat transfer fluid generated by condensation. And by providing the 2nd spraying device which distributes and supplies the heat transfer fluid stored in the condensation heat transfer fluid receiving tray to the heat transfer tube, the heat transfer fluid is sprayed to the heat transfer tube by the second spraying device. It is possible to exchange heat between the exhaust gas sprayed and flowing through the heat transfer tubes and the heat transfer fluid.
[0017]
【The invention's effect】
As a result, by utilizing the exhaust gas discharged from the combustion system, a vacuum water heater that can prevent the leakage of exhaust gas while saving the heating energy when heating the heat transfer water stored at the bottom of the can body I was able to provide it.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below, but the present invention is not limited thereto.
[0019]
[First embodiment]
As shown in FIG. 1, the vacuum hot water machine according to the present invention has a can body 10 whose inside is a vacuum space, and a reservoir for storing heat transfer water as a heat transfer medium at the bottom of the can body 10. Heating unit 30, heating unit 30 that generates water vapor as medium vapor by heating the heat medium water stored in storage unit 20, and the top of can body 10, and distributes water therein. A hot water circulation pipe 40, a heat transfer pipe 50 provided in a vacuum space inside the can body 10, and through which exhaust gas circulates, a heat transfer fluid supply section 60 for supplying heat transfer water to the heat transfer pipe 50, and the heat And a heat medium liquid supply control unit 80 for controlling the presence or absence of the heat medium liquid supply of the medium liquid supply unit. The heating unit 30 includes a burner 31 as a heating device and a combustion chamber 32, and a combustion exhaust gas outlet 33 for discharging the combustion exhaust gas of the burner 31 is provided in the combustion chamber 32.
[0020]
The heating medium liquid supply unit 60 includes a first spraying device 61, and the first spraying device 61 is provided in the storage unit and can discharge the heat transfer water stored in the storage unit 20. The first piping 62 that supplies from the heat transfer water discharge port to the upper side of the heat transfer tube 50, and the heat transfer water that is provided in the middle of the first piping 62 and extends from the storage unit 20 to the upper side of the heat transfer tube 50. And a first spraying part 64 that is provided at the end of the first pipe 62 and that sprays heat transfer water to the heat transfer pipe 50. The heat medium liquid supply controller 80 controls whether the pump 63 is movable.
[0021]
When operating a vacuum hot water machine, the heat transfer water stored in the storage unit 20 is heated to raise the temperature by igniting the burner 31. Since the inside of the can is in a vacuum state, that is, a reduced pressure state, water vapor begins to be generated at a temperature of the heat transfer water of about 40 to 50 ° C., but the burner 31 has a temperature of the heat transfer water of the reservoir 20 of about 90 ° C. Heat to maintain degree. The water vapor fills the inside of the can body 10, and the water vapor exchanges heat with the water flowing in the hot water flow pipe 40 provided at the top of the can body 10. The water flowing inside the hot water circulation pipe is warmed to about 60 ° C. and can be used for various purposes. The water vapor that exchanges heat with the water flowing inside the hot water circulation pipe is condensed and changed into a heat transfer medium again. The condensed heat transfer water falls by gravity and is stored again in the storage unit 20. Incidentally, tap water or pure water can be used as the heat transfer water.
[0022]
The heat transfer water stored in the storage unit 20 flows through the first pipe 62 and is distributed and supplied to the heat transfer tube 50 from the vicinity of the heat transfer tube 50 through the first distribution unit 64. A plurality of small-diameter holes are provided in the discharge port for discharging the heat transfer water in the first spraying portion 64 so that the heat transfer water can be discharged in a shower shape. Since the temperature of the exhaust gas flowing through the heat transfer pipe 50 is about 200 to 500 ° C., the heat transfer water that has exchanged heat with the exhaust gas flowing through the heat transfer pipe 50 is sufficiently heated. Heat power can be reduced and heat energy can be saved.
[0023]
In addition, the exhaust gas discharged | emitted from a combustion system is discharged | emitted irregularly, and the case where it does not always flow through the inside of the said heat exchanger tube 50 is also considered. However, even when the exhaust gas does not flow through the heat transfer tube 50, the operation of the vacuum water heater according to the present invention is not hindered by igniting the burner 31.
[0024]
On the other hand, when the operation of the vacuum water heater is not performed, that is, when there is no need to raise the temperature of the water flowing in the hot water circulation pipe 40, the ignition of the burner 31 is stopped and the heating medium liquid supply is performed. The control unit 80 stops the operation of the pump 63. The heat transfer water stored in the storage unit 20 by stopping the ignition of the burner 31 is at room temperature, and no water vapor is generated. Therefore, there is no heat exchange between the water vapor and the water flowing through the hot water circulation pipe 40. . Further, since the heat transfer water is not supplied from the first spraying portion 64 to the heat transfer pipe 50 by stopping the operation of the pump 63, the heat transfer water and the exhaust gas flowing inside the heat transfer pipe 50. There is no heat exchange with the heat transfer water, and the temperature of the heat transfer water is not increased. Even if a high temperature exhaust gas circulates inside the heat transfer tube 50, the heat transfer tube 50 is provided in the vacuum space of the can 10 and the heat transfer tube 50 and the hot water flow tube 40 Since there is a vacuum space between them, it is difficult for the heat of the exhaust gas flowing inside the heat transfer pipe 50 to be transferred to the water flowing inside the hot water circulation pipe, and the water flowing inside the hot water circulation pipe 40 There is no temperature rise.
[0025]
In the vacuum hot water machine according to the present invention, whether the temperature of the water flowing through the hot water circulation pipe 40 is raised or not raised, the pipe line of the heat transfer pipe 50 through which the exhaust gas flows is switched. There is no danger of high temperature exhaust gas leaking from the heat transfer tube 50 because the heat transfer tube 50 is not provided with a damper for switching the pipe line.
[0026]
Before the heat medium liquid supplied from the heat medium liquid supply unit 60 exchanges heat with the exhaust gas flowing through the heat transfer pipe, the heat medium water stored in the storage unit 20 is warmed by the heating unit 30. A shielding case 70 can be provided to prevent heat exchange with the generated steam.
A shielding case 70 is provided so as to accommodate the outlet of the first spraying portion 64 from which the heat transfer fluid is discharged and the portion of the heat transfer tube 50 that contacts the supplied heat transfer fluid. A water vapor outlet 71 is provided on the upper surface so that water vapor can be discharged, and a heat medium liquid outlet 72 is provided on the lower surface of the shielding case 70 so that the heat medium liquid can be discharged after heat exchange. It has been. By adopting such a configuration, the heat exchange rate between the heat medium liquid supplied from the heat medium liquid supply unit 60 and the exhaust gas flowing through the heat transfer pipe 50 can be further improved.
[0027]
[Second Embodiment]
As shown in FIGS. 2 and 3, the heat medium liquid supply unit 60 can be configured by a second spraying device 65. The second spraying device 65 sprays and supplies the condensed heat transfer medium receiving tray 66 provided below the hot water circulation pipe 40 and the heat transfer fluid stored in the condensed heat transfer medium receiving tray 66 to the heat transfer tube 50. Provided in the middle of the second pipe 68, the second pipe 68 for supplying the heat medium liquid stored in the condensed heat medium liquid receiving tray 66 to the second spray part 67, and the second pipe 68. It is also possible to provide a valve 69 capable of suppressing the flow of the liquid medium. The heat medium liquid supply controller 80 controls the opening and closing of the valve 69.
[0028]
When operating a vacuum hot water machine, the heating medium water stored in the storage unit 20 is heated to raise the temperature by igniting the burner 31, and water vapor is filled into the can body 10, and the water vapor is Heat exchange with the water flowing through the hot water flow pipe 40 is performed. The water vapor that exchanges heat with the water flowing through the hot water circulation pipe 40 is condensed and changed into a heat transfer water again. The condensed heat transfer water falls by gravity and is stored in the condensation heat transfer fluid receiving tray 66. The heat transfer liquid 50 is stored in the condensed heat transfer liquid receiving tray 66 through the second pipe 68 by opening the valve 69 in the heat transfer liquid supply control unit 80, and the heat transfer pipe 50 in the second spraying unit 67. As a result, the heat exchange between the exhaust gas flowing through the heat transfer pipe 50 and the heat transfer water can be performed, and as a result, the heat transfer water is heated and the heating power of the burner 31 can be reduced. It can save heat energy. The discharge port for discharging the heat transfer water in the second spraying section 67 is configured with a plurality of small-diameter holes so that the heat transfer water can be discharged in a shower-like manner.
[0029]
On the other hand, when the vacuum hot water machine is not operated, the ignition of the burner 31 is stopped, and the valve 69 is closed by the heat medium liquid supply controller 80. Since the steam is not generated by stopping the ignition of the burner 31, there is no heat exchange between the steam and the water flowing in the hot water circulation pipe 40. Further, by closing the valve 69, no heat transfer water is supplied from the second spraying portion 67 to the heat transfer pipe 50 via the second pipe 68. Therefore, the heat transfer water and the heat transfer water are not supplied. There is no heat exchange with the exhaust gas flowing inside the heat pipe 50, and the temperature of the heat transfer water is not increased.
[0030]
It is preferable that the outer periphery of the cross section in the plan view of the upper end portion of the horizontal edge of the condensing heat transfer medium receiving pan 66 includes the outer periphery of the cross section in the plan view of the hot water circulation pipe 40. With this configuration, even if the heat medium liquid is condensed in any part of the hot water circulation pipe 40, it can be received by the condensed heat medium liquid receiving tray 66.
[0031]
[Another embodiment]
In the second embodiment, an overflow pipe 90 for allowing the heat transfer water stored in the condensed heat transfer medium receiving tray 64 to flow out to the storage unit 20 can be provided. One end portion of the overflow tube 90 is provided at a position slightly deeper than the upper end portion of the horizontal edge of the condensed heat medium liquid receiving tray 64. As a result, a large amount of heat transfer fluid is stored in the condensing heat transfer fluid receiving tray 64, and the heat transfer fluid overflows the overflow pipe 90 before the heat transfer fluid overflows beyond the upper edge of the horizontal edge of the condensation heat transfer fluid receiving tray 64. Therefore, even if a large amount of heat medium liquid is stored in the condensed heat medium liquid receiving tray 64, the heat medium liquid does not overflow. The lower end of the other pipe of the overflow pipe 90 is provided in the vicinity of the storage section 20 and is set so that the heat transfer fluid is supplied to the storage section 20.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a vacuum water heater according to the present invention. FIG. 2 is a diagram illustrating a vacuum water heater according to the present invention. FIG. 3 is a diagram illustrating a vacuum water heater according to the present invention. 4] Illustration of a conventional vacuum water heater 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 10 Can body 20 Storage part 30 Heating part 31 Burner 40 Hot water distribution pipe 50 Heat transfer pipe 60 Heat transfer liquid supply part 61 First spraying apparatus 62 First piping 63 Pump 64 First spraying part 65 Second spraying apparatus 66 Condensing heat transfer medium Receptacle 67 Second spraying section 68 Second piping 69 Valve 70 Shielding case 80 Heat transfer fluid supply control section 90 Overflow pipe

Claims (3)

A can body whose inside is a vacuum space, a hot water circulation pipe which is provided at the top of the can body and circulates water, a storage part which is provided at the bottom of the can body and stores a heat transfer fluid, and the storage A vacuum water heater having a heating part that heats the heat transfer fluid stored in the part and generates medium vapor,
In the vacuum space inside the can body, provided with a heat transfer tube through which exhaust gas from a combustion system different from the heating unit flows,
A heat medium liquid supply unit for supplying a heat medium liquid to the heat transfer tube;
A vacuum hot water machine provided with a heat medium liquid supply control unit that controls whether or not the heat medium liquid supply unit supplies heat medium liquid.   The vacuum hot water machine according to claim 1, wherein the heating medium liquid supply unit includes a first spraying device that sprays and supplies the heating medium liquid of the storage unit to the heat transfer pipe. A condensing heat medium liquid receiving tray capable of storing heat medium liquid condensed and generated by exchanging heat with water flowing through the hot water flow pipe is provided below the hot water flow pipe,
The vacuum hot water machine according to claim 1, wherein the heat medium liquid supply unit includes a second spraying device that sprays and supplies the heat medium liquid stored in the condensed heat medium liquid receiving tray to the heat transfer pipe.

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