JPS5946450A - Space heater utilizing hot air - Google Patents

Abstract

PURPOSE:To perform a humidifying operation guide simply by utilizing the moisture contained in combustion gas. CONSTITUTION:A condenser 9 is arranged closer to the upstream side of a convection air current than a heat exchanger 3 and a burner 2 so that exhaust gasses are cooled effectively by low temperature air. Further, dewdrops adhere to the inner wall surface of the tube of the condenser 9 and are collected in a water collector 10. The exhaust gasses are reheated through a reheater 11 and then discharged outside from an exhaust pipe 4 and a supply and discharge cylinder 6. The condensed water collected by the water collector 10 flows into an evaporator 13 from a water pipe 12 due to gravity, permeates an evaporation plate 14 and vaporises by being subjected to the convection air dried and heated to a temperature higher than the room temperature so that the air in the room is humidified to thereby prevent the air from becoming dry.

Description

[Detailed description of the invention] The present invention relates to a humidifying system for a hot air heater.

As is well known, when a heater that heats indoor air using a heat exchanger is operated, the relative humidity in the room decreases. Therefore, in the past, humidification was generally carried out by equipping a water tank and an evaporator.

However, there are problems such as the hassle of water supply and the need to treat impurities contained in tap water.

The present invention has been made in view of the above points, and by focusing on the presence of moisture contained in combustion gas and configuring to perform humidification using this moisture, humidification can be performed extremely easily. The purpose is to provide hot air heaters.

The present invention will be described below with reference to embodiments shown in the drawings.

In Fig. 1, ■ is the outer frame of the heater, 2 is the combustor that burns kerosene, etc., 3 is the heat exchanger, 4 is the exhaust pipe, 5 is the intake pipe for combustion, and 6 is the connection between these two pipes 4.5. This is an air supply and exhaust pipe that functions as a double pipe, and is installed to protrude from the indoor side to the outdoor area. 7 is a motor for a blower that causes convection of indoor air, and 8 is a fan. Note that although the combustion air blower, fuel-related equipment, etc. are not shown, publicly known ones can be used. 9 is a condenser, 10 is a water collector, 11 is a reheater for heating in a high temperature section such as the combustor 2, 12 is a water pipe, 13 is an evaporator, 14 is an evaporation plate, and 15 is a hot air outlet. In order to suppress the leakage of exhaust gas into the room, the water pipe 12 is a thin tube or a pipe with a trap to obtain a water-sealing effect, and the evaporator 13 is tightly covered with an evaporator plate 14 to create an open water surface inside the room. This is intended to have no occlusion effect.

The condenser 9 is arranged upstream of the combustor 2 and the heat exchanger 3 in the air flow path of indoor air blown by the fan 8, so that it can come into contact with the low-temperature air flow.

Since the condenser 9 is a heat exchanger between gases with a small temperature difference, a tube heat exchanger or the like is suitable because it is easy to process and has a large surface area, and FIG. 1 shows the tube heat exchanger. be. The water collector 10 has a water pipe 12 connected to its lower part, and has a tapered bottom shape that allows water to be guided without forming a pool of water. Make sure it doesn't accumulate. The condensed water of the exhaust gas is mixed with sulfuric acid, although it is weak, because kerosene contains sulfur and carbon, and therefore the condensed water is mixed in with the condenser 9 and water collector 10.
It is desirable that the material be made of a material that has some degree of sulfuric acid resistance, such as stainless steel.

The water piping 12 and evaporator 13 are areas where condensed water accumulates, and sulfuric acid has a high boiling point of about 340°C, making it easy for sulfuric acid to remain.
It becomes a sulfuric acid environment of 1m degree. Therefore, materials with high sulfuric acid resistance, such as lead and resin-lined metal materials, are used as the material for the jaw portion 12 and the workpiece 3.

Further, the evaporation plate 14 is preferably made of a water-absorbing material having excellent heat resistance and corrosion resistance, such as glass fiber.

Next, to explain the operation, a fuel supply device and a combustion blower (not shown) supply an appropriate amount of fuel to the combustor 2 and combustion air (J
j is fed and burnt. The combustion gas reaches a temperature of 1000°C or higher, and in the combustor 2 and the heat exchanger 3, heat is exchanged with the convection air (indoor air) circulated by the convection fan 8 driven by the blower motor 7, and the temperature drops to about 110"C. .

The convection air becomes warm air of about 70'c and is discharged into the room through the outlet 15. The exhaust gas whose temperature has dropped to about 110°C as described above has a fuel composition [in kerosene, approximately hydrogen 14
, carbon 86% by weight], the dew point is not reached at this temperature, but in the present invention, the exhaust gas leaving the heat exchanger 3 further enters the condenser 9, where it is also cooled. In other words, since the condenser 9 is placed upstream of the convection air flow from the heat exchanger 3 and combustor 2, the exhaust gas is effectively cooled by low temperature (approximately 20°C) air whose temperature has not risen. be done. Additionally, the tube type with sufficient heat transfer area also contributes to increasing the cooling effect. For these reasons, the exhaust gas is cooled to below the dew point temperature (approximately 45° C.), and condensed water adheres to the inner wall surface of the tube of the condenser 9 and drips. The dropped water is then collected in the water collector 10. If the exhaust gas is led outside as it is, it will be further cooled down and the remaining moisture will condense in the pipes on the way, causing problems. Therefore, after being reheated through the reheater 11, the exhaust pipe 4 and the supply and exhaust pipe 6
Discharge outdoors. The flows of the combustion system fluid and convection air described above are indicated by arrows A and B in the figure, respectively. In the case of kerosene exhaust gas, the amount of heat released is 4000 kca I
Approximately 60% of the moisture in the combustion gas can be removed by a condenser 9 of an appropriate size in an H class heater.
The amount of water is about 0.3β/h, which is comparable to the capacity of a normal humidifier and is sufficient. The condensed water taken out flows into the rinsing device 13 by gravity through the water pipe 12, and then passes through the evaporator plate 1.
4, is sucked up, and evaporates when it comes in contact with convective air (warm air) heated and dried from room temperature. As a result, indoor air is humidified and dryness can be prevented.

In this example, in addition to the water sealing effect provided by the water pipe 12, the evaporator 1
3 is tightly covered with the evaporator plate 14 to prevent the evaporator 13 from forming an open water surface into the room, the opening of the evaporator 13 can be substantially closed, and the indoor
9. Exhaust gas leakage can be effectively prevented.

FIG. 2 shows another embodiment of the evaporator 13 with an open water surface. The evaporator plate 14 has a shape that can be easily inserted into the evaporator 13 with a gap, and a large evaporation area can be obtained. Since the water surface is open, a valve mechanism is required to prevent exhaust gas from leaking indoors, but in this example, a reservoir 13' is provided at the bottom of the evaporator 3, and a float made of foamed resin, hollow metal, etc. A type spherical valve 13'' is installed, and the opening 12' of the water pipe 12 is designed to operate as a valve seat.The float type spherical valve 13'' has a specific gravity of less than 1 and floats on water, and the valve type has an opening. The push-up blade (approximately 0.6 g for the diameter of the opening 12') determined by the maximum pressure of the combustion air system (approximately 30 II + 1 water column) received from the part 12', and before the condensed water reaches the water collector IO. The valve is heavy enough to open at that water head.

In the embodiment shown in FIG. 2, at the start of operation when no condensed water is generated, the gas pressure from the exhaust gas system or, if there is a pressure difference between indoors and outdoors, the pressure including that pressure difference is applied to the opening 12.
', but this valve 13' remains closed by its own weight, and no leakage of exhaust gas into the room occurs. When condensed water is generated and accumulates in the water pipe 12, and the water head increases toward the water collector 10, its buoyancy causes the float valve 13''
The valve is opened and condensed water remains in the reservoir 13'. When the pool of condensed water increases and reaches the inside of the evaporator 13, it is evaporated by the evaporator plate 14 (In this state, the float valve 13'' floats and remains open).

It should be noted that the present invention can be modified in various ways other than the embodiments described above. For example, the water collector 10 may not be provided integrally with the lower part of the condenser 9, but may be separated from the condenser 10 and provided independently below it. You can also do that.

Further, the present invention is not limited to the forced air supply/exhaust type as shown in FIG. 1, but can be implemented in the same way with a forced exhaust type where combustion air is taken in from inside the room.

The present invention is as explained above, and the following effects can be obtained.

(1) In conventional humidification systems, tap water is usually replenished at least once a day to perform humidification, but the present invention eliminates the need for such complicated water replenishment. In other words, a water-free humidifier can be realized.

(2) Structurally, there is no need to provide a water supply port, large water tank, etc., so the product can be designed simply.

(3) Tap water contains quite a large amount of impurities, and if you humidify at a rate of about 0.24/h for about 10 hours a day and continue to do this in the winter, you will end up with about the amount of limescale on the palm of your hand. However, since the present invention uses condensed water from exhaust gas, this is eliminated, cleaning is not necessary, and maintenance is free.

(4) Since water is automatically supplied and humidified in conjunction with the combustion operation, problems such as indoor dryness and furniture damage caused by forgetting to supply water can be reliably prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the overall configuration of one embodiment of the present invention, and FIG. 2 is a cross-sectional view of essential parts of another embodiment of the present invention. 2... Combustor, 3... Heat exchanger, 9... Condenser,
13... Evaporator. Representative Patent Attorney Takashi Okabe

Claims (1)

[Claims] A hot air heater that discharges exhaust gas after combustion in the combustor to the outside through a heat exchanger, and also blows indoor air into the room as hot air through the combustor and heat exchanger section using a blower. A condenser for condensing moisture in the exhaust gas exiting the heat exchanger is installed on the upstream side of these devices in the air flow path for indoor air blown to the combustor and the heat exchanger. and a hot air heater further comprising an evaporator into which water condensed in the condenser is introduced and evaporates the water into the hot air.