JPH078983Y2 - Hot air generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a hot air generator having excellent thermal efficiency.

(Prior Art) The inventor first installed a large number of heat exchange pipes in a tank filled with a heat storage medium, and sent indoor air to the heat exchange pipes to exchange heat with the heat storage medium to form warm air in the chamber. We have developed a hot-air generator that discharges and heats the inside, and has applied for a patent (Japanese Patent Application No. 62-32198).

According to this warm air generator, the heat storage medium is heated in a tank having a large capacity as compared with heating the ambient air through the heat storage medium in the heat exchange pipe, and the heat is stored in the heat storage medium. Since the indoor air is passed through the exchange pipe, the heating efficiency of the air is good, and since the air is passed through the relatively thin heat exchange pipe, it is uniformly heated and causes discomfort when discharged into the room. There is an advantage that it does not.

(Problems to be solved by the invention) However, it has been found that the above-mentioned hot air generator has the following problems.

That is, since the indoor air is sent through a heat exchange pipe having a small diameter, in order to obtain a large amount of air, the heat exchange pipes must be arranged relatively densely in the tank, and therefore, the viscous property of In the case of a high heat storage medium, heat convection does not occur well even if it is heated, it takes a long time to uniformly heat the inside of the tank, and the heat storage medium in the part far from the heater is effective during operation. There was a problem that the required warm air could not be obtained because it was not heated.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a hot air generator in which the heat convection of the heat storage medium is well secured and the heat efficiency is excellent.

(Means for Solving the Problems) An object of the present invention is to provide a tank, a heat storage medium accommodated in the tank, an electric heater disposed below the tank to heat the heat storage medium, and the inside of the tank. A plurality of them are provided substantially parallel to each other so as to be opened in the side wall surface of the tank 2, the cross section is long in the vertical direction, the lower part is located directly above the electric heater, and the upper part is buried in the upper part of the heat storage medium. A heat exchange tube, a heat radiating fin disposed in the heat exchange tube so as to partially contact an inner wall of the heat exchange tube, and indoor air is sent to the heat exchange tube to exchange heat with the heated heat storage medium. This is achieved by a warm air generator including a fan for discharging the air into the room.

At this time, it is preferable to cover the surface of the heat storage medium with a liquid that is lighter than the heat storage medium, does not mix with the heat storage medium, and has low volatility itself.

Further, it is preferable to use a heat storage medium that is solid at room temperature and becomes liquid when heated by an electric heater.

(Operation) In the present invention, the heat exchange tube has a vertically long cross section, the lower part is located directly above the electric heater, and the upper part is substantially parallel to the bottom of the heat storage medium. Since it is provided and opened on the side wall surface of the tank 2, even if the heat storage medium has high viscousity, the heat storage medium heated by the electric heater passes vertically through the adjacent heat exchange tubes. Good heat convection is carried out between the lower part and the upper part of the tank without being obstructed by the heat exchange cylinder, and the temperature in the tank rises rapidly and uniformly, so that the operable time can be shortened.

Further, even during operation, heat convection of the heat storage medium is favorably performed, and favorable heat exchange is performed by the action of the radiation fins, etc., so that warm air of a uniform temperature can be efficiently obtained.

By covering the surface of the heat storage medium with a liquid that is lighter than the heat storage medium, does not mix with the heat storage medium, and has low volatility by itself, evaporation of the heat storage medium, oxidation, generation of odor, etc. can be prevented, so the tank is exposed to the atmosphere. An open type with a simple structure that communicates can be adopted.

Also, by adopting a solid heat storage medium at room temperature, it is possible to prevent leakage to the outside even if the tank falls over.

(Embodiment) A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a warm air generator of a warm air generator according to the present invention.

Reference numeral 10 denotes a tank for accommodating the heat storage medium, which is formed in a box shape from a material having good corrosion resistance such as stainless steel. A heat insulating material is attached to the surface of the tank 10 as needed.

12 is an inlet for the heat storage medium, and the heat storage medium is supplied from the inlet 12.
14 is filled in the tank 10. In this embodiment, the tank 10 communicates with the atmosphere through the inlet 12. That is, the tank 10 is open to the atmosphere. The inlet 12 is formed in a valve structure as described later so that the valve will be closed and the heat storage medium 14 will not leak outside when the tank 10 falls down.

In addition, the heat storage medium 14 is lighter than the heat storage medium 14 in the tank 10.
A liquid that is immiscible with the liquid and has a low volatility, such as silicone oil 16, is placed over the heat storage medium 14. As a result, even if the heat storage medium 14 is volatile, evaporation is prevented, and oxidation of the heat storage medium 14 and leakage of odorous gas to the outside are prevented.

The type of the heat storage medium 14 is not particularly limited, but, for example, glycols such as ethylene glycol, diethylene glycol and propylene glycol, glycerin, synthetic hydrocarbons and the like having a small specific heat and a high boiling point are preferable. Further, a paraffinic hydrocarbon having a large number of carbon atoms, which is solid at room temperature and liquid at high temperature, can be used. These solid substances at room temperature are disadvantageous in that the heat of fusion is removed when they rise, but they are convenient because they do not flow out to the outside even when the tank falls over.

Water may be used as the heat storage medium 14.

Reference numeral 18 denotes a U-shaped electric heater, and a plurality of electric heaters 18 are appropriately arranged below the tank 10 to heat the heat storage medium 14. Reference numeral 20 denotes a temperature detection sensor that detects the temperature of the heat storage medium 14 above the tank and controls the electric heater 18 by a control unit (not shown) to prevent the heat storage medium 14 from overheating.

Reference numeral 22 denotes a heat exchange tube, which has a rectangular cross-section and is liquid-tightly fitted and fixed in openings that are elongated in the vertical direction on the front and back surfaces of the tank 10 and are parallel to each other.

The lower side of the heat exchange cylinder 22 is positioned immediately above the electric heater 18, and the upper side thereof reaches the upper part of the heat storage medium 14 filled in the tank 10.

Of course, the outer surface of the heat exchange cylinder 22 is in contact with the heat storage medium 14 filled in the tank 10, and in the heat exchange cylinder 22, a fan (not shown) installed in a duct (not shown) of the warm air generator ( Room air is sent in by (not shown), and the sent air exchanges heat with the heat storage medium 14 to be heated and becomes hot air and is discharged into the room.

Inside the heat exchange tube 22, heat radiation fins 24 that are in contact with the inner wall of the heat exchange tube at a plurality of locations are arranged, and the air sent into the heat exchange tube 22 contacts the inner wall of the heat exchange tube 22 and the heat radiation fins 24. Heat is efficiently exchanged. It is preferable that the radiating fins 24 are spirally twisted in the air feeding direction so that the heated air is agitated and mixed, and the heated air is discharged at a uniform temperature.

FIG. 2 shows the valve structure of the inlet 12.

A valve body 28 is provided in a valve chamber 26 provided in the tank 10 near the inlet 12.
When the tank (10) is laid down, the heat storage medium (14) presses the valve element (28) to close the inlet port (12) and prevent the heat storage medium (14) from leaking to the outside. Further, the portion of the injection port 12 projecting from the upper surface of the tank 10 is formed in a two-stage cylindrical shape, a seal 30 is provided on the step portion, and a flow hole 32 is provided on the outer wall near the step portion having a small diameter. At the same time, the cap 34 is fitted on the male screw portion provided on the outer wall of the small diameter portion. This cap 34
When the hot air generator is used, the tank 10 is pulled up to a position located above the small diameter portion, the tank 10 is communicated with the atmosphere through the flow hole 32, and the expanded tank 10 when the heat storage medium 14 is heated.
Release the internal air to the atmosphere. When the warm air generator is not used, the cap 34 is tightened and the lower end of the cap 34 is brought into close contact with the seal 30 to allow the tank 10 to pass through the flow hole 32.
The communication between the inside and the atmosphere is cut off so that evaporation and leakage of the heat storage medium 14 can be reliably prevented.

The present invention is configured as described above.

Then, when a power switch (not shown) of the electric heater 18 is turned on, the heat storage medium 14 is heated and convects in the tank 10. In this case, inside the tank 10, the adjacent heat exchange tubes 22
Since the space is secured in the space communicating with each other in the vertical direction, the heat storage medium 14 effectively convects in the vertical direction in the tank 10 along the outer wall of the heat exchange tube 22. In this respect, it was confirmed that even if the heat storage medium 14 has high viscosity or is solid at room temperature, good heat convection gradually occurs as the temperature rises.

Since good heat convection is ensured as described above, the heat storage medium has a good temperature rising property and is heated to the required temperature in a short time. At this time, the fan is automatically driven, and air is sent into the heat exchange cylinder 22, and as described above, the sent air heats up by exchanging heat with the heat storage medium and is discharged as warm air. Of.

At that time, the room air passes through the heat exchange tube 22 having a relatively large cross-sectional area, and the heat radiation tube 22 has the radiation fins 24, and the room air also contacts the radiation fins 24. Since it is heated by heating, the temperature is raised quickly even though a relatively large amount of air is secured.

Also in the present invention, since the heat storage medium 14 is housed in the tank 10 having a large capacity, the heat storage property is good, and as described above, the upper and lower parts of the tank are uniformly heated by heat convection, and further, Since the heat is satisfactorily exchanged by the radiation fins 24, the heat exchange rate is high.

(Effect of the Invention) As described above, in the present invention, the heat exchange cylinder has a cross section that is long in the vertical direction, the lower portion is located directly above the electric heater, and the upper portion is substantially parallel to the bottom of the heat storage medium. Since a plurality of tanks are provided in the tank and open to the side wall surface of the tank 2,
Even if the heat storage medium has a high viscosity, the heat exchange tube between the lower part and the upper part of the tank passes through the space where the heat storage element heated by the electric heater passes vertically through the adjacent heat exchange tube. Heat convection is favorably carried out without being hindered by the heat, and the temperature in the tank rises rapidly and uniformly, so that the operable time can be shortened.

Further, even during operation, heat convection of the heat storage medium is favorably performed, and favorable heat exchange is performed by the action of the radiation fins, etc., so that warm air of a uniform temperature can be efficiently obtained.

By covering the surface of the heat storage medium with a liquid that is lighter than the heat storage medium, does not mix with the heat storage medium, and has low volatility by itself, evaporation of the heat storage medium, oxidation, generation of odor, etc. can be prevented, so the tank is exposed to the atmosphere. An open type with a simple structure that communicates can be adopted.

Also, by adopting a solid heat storage medium at room temperature, it is possible to prevent leakage to the outside even if the tank falls over.

Although the present invention has been variously described with reference to the preferred embodiments, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the structure of a warm air generator of a warm air generator according to the present invention, and FIG. 2 is a sectional view showing the structure of an inlet. 10 …… tank, 12 …… inlet, 14 …… heat storage medium, 16 ……
Silicone oil, 18 ... Electric heater, 20 ... Temperature detection sensor, 22 ... Heat exchange tube, 24 ... Radiating fin, 26 ... Valve chamber, 28 ... Valve body, 30 ... Seal, 32 ... Distribution Hole, 34 ……
cap.

Claims (3)

[Scope of utility model registration request] 1. A tank, a heat storage medium accommodated in the tank, an electric heater arranged at a lower portion of the tank for heating the heat storage medium, and an opening provided in a side wall surface of the tank 2 penetrating the inside of the tank. A plurality of heat exchange tubes arranged in parallel in parallel with each other such that the cross section is long in the vertical direction, the lower portion is located directly above the electric heater, and the upper portion is buried in the upper portion of the heat storage medium. , A heat-dissipating fin that is arranged in contact with the inner wall of the heat-exchange tube, and a fan that sends indoor air into the heat-exchange tube to exchange heat with the heated heat storage medium and discharge the heat-exchange medium into the room. Wind generator. 2. The warm air generator according to claim 1, wherein the surface of the heat storage medium is covered with a liquid lighter than the heat storage medium and immiscible with the heat storage medium. 3. The warm air generator according to claim 1 or 2, wherein the heat storage medium is a solid at room temperature and becomes a liquid when heated by an electric heater.