JPH0833239B2 - Hot air heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a warm air heater that blows air heated by a heating means by a blower.

[Prior Art] In a warm air heater, in order to efficiently heat the room, warm air is generally blown out toward the front of the device, and the warm air improves the distribution of room temperature. .

In addition, since the indoor air temperature is low and the temperature of the hot air that is blown out is low at the beginning of the operation of the warm air heater, the applicant of the present application provided a louver that opens and closes a part of the hot air outlet and I previously proposed a method that raises the warm air temperature by limiting the amount of air blown out.

[Problems to be Solved by the Invention] However, when the room is cold and the room temperature is low as in the initial stage of operation, not only the temperature of the room air but also the temperature of the room floor surface and the wall surface are low. Has become. For this reason, even if the warm air blown out from the equipment is sufficiently warm, the temperature of the floor or wall surface is low, so that the heat of the air facing the floor or wall is taken away by each surface, and the temperature becomes low. In particular, when the temperature of the floor surface is low, the user is constantly given a cold sensation, which makes it difficult to obtain a heating sensation.

It is an object of the present invention to provide a warm air heater that can give a better feeling of heating to a user at the beginning of operation when the room is cold.

[Means for Solving the Problems] In the present invention, a fan and a heating source are arranged in a casing provided with an indoor air intake and a hot air outlet, and the target temperature detected by the temperature setting means and the temperature detection means detect the temperature. In a warm air heater that controls the heating source and the blower, respectively, based on the indoor temperature, the direction of the warm air blown forward from the temperature air outlet at the time of operating the heating source is at least forward and downward. According to the louver for changing and the room temperature detected by the temperature detection means, the lower the room temperature is, the direction of the warm air blown forward from the hot air outlet becomes lower front, and A louver control that controls the louver so that the direction of the hot air blown forward from the hot air outlet becomes lower forward as the operation duration becomes shorter according to the operation duration of the heating source. The technical means is to have the means.

According to a second aspect of the present invention, in the first aspect, the louver control means controls the louver according to a fuzzy control rule based on a fuzzy variable regarding the room temperature and a fuzzy variable regarding the operation duration time.

According to a third aspect of the present invention, in the first or second aspect, there is provided a blower control means for controlling the blower according to a fuzzy control rule based on a fuzzy variable regarding the indoor temperature and a fuzzy variable regarding the operation duration time. As a means.

[Operation and Effect of the Invention] In the present invention, the warm air outlet is provided with a louver that changes the direction of the blown warm air at least downward, and the louver is heated when the room temperature is lower. The shorter the operation duration of the source is, the more the direction of the hot air blown forward from the hot air outlet is controlled so that it is forward and downward.
It is possible to efficiently heat the floor of the room. As a result, the user is warmed not only from the hot air outlet but also from the radiant heat from the floor, etc., so that the feeling of heating is improved.

In this case, the louver is controlled based on the operation duration time and the room temperature, so that the floor surface temperature does not rise excessively and the floor surface can be heated appropriately.

In addition, when the louver is controlled by a fuzzy control rule based on a fuzzy variable related to the operation duration and a fuzzy variable related to the room temperature, the optimum heating effect is obtained according to the heating capacity of the heating source and the blowing capacity of the blower. Easy to get caught.

Furthermore, regarding the operating state of the blower, if the fuzzy control rule based on the fuzzy variable related to the room temperature and the fuzzy variable related to the operation duration is used, a further effect considering the feeling of heating due to warm air and the feeling of heating from the floor surface is achieved. You can get a realistic heating feeling.

EXAMPLES Next, the present invention will be described based on examples.

In a stationary type gas warm air heater 1 whose outer shape is shown in FIG. 2 and FIG. 3, an outer casing 2 is formed from several members made of a metal plate and resin, and each outer casing 2 has a plurality of outer casings. The indoor air intake 3 and the intake 4 for the combustion air, which are small openings, are provided above the back surface, and the warm air outlet 5 that blows out warm air is provided below the front surface. The suction port 4 is the outer casing 2
It is covered with a filter 6 which is detachably provided.

As schematically shown in FIG. 4, a convection duct 7 is provided inside the outer casing 2, and near the hot air outlet 5 in the convection duct 7, a flow-through type blade using the convection duct 7 as a blower casing. A convection fan 8 for driving the vehicle 8a by a DC motor 8b is arranged, and the suction port 4 and the warm air outlet port 5 are arranged.
Are the upstream end and the downstream end of the convection duct 7, respectively.

The warm air outlet 5 is provided with a louver 9 for changing the degree of opening of a part of the warm air outlet 5, and is rotated according to an operating state to blow out the air flow passing through the convection duct 7. Alternatively, the blowing direction is controlled.

Here, when the louver 9 closes a part of the warm air outlet 5, as shown in FIG. 5, the louver 9 assumes a closed state in which the upper half of the warm air outlet 5 is closed and the warm air outlet 5 is closed. When it is opened, as shown in FIG. 6, it is opened to the outside so as to be in close contact with the upper end surface of the hot air outlet 5.

Furthermore, in order to blow out the warm air blown out from the warm air blowout port 5 toward the floor surface in the room, as shown in FIG.
It opens in a half-open state at about 45 ° and raises the floor temperature in the room.

As described above, the open state, the half open state, and the closed state of the louver 9 are controlled by the control device 30 described later according to the operating state.

On the other hand, on the upstream side of the convection fan 8 in the convection duct 7,
A burner 10 as a heating means is provided, and the high-temperature combustion gas generated in the burner 10 is mixed with the indoor air taken in from the indoor air intake 3 along with the operation of the convection fan 8 to become warm air, It is blown out from the hot air outlet 5.

A nozzle 13, which is a downstream end of a fuel supply path 12 that guides combustion gas, is arranged in an air guide pipe 11 that guides combustion air from the suction port 4 to the burner 10. The fuel gas ejected from the nozzle 13 is used for combustion. The burner 10 is guided to the mixing chamber 14 together with the air.
Burns at.

The fuel supply path 12 is provided with two solenoid valves 15 and 16 and a gas governor 17 for keeping the supply gas pressure constant in order from the upstream side, and further downstream thereof, a proportional valve 18 for adjusting the fuel gas amount. It is provided.

An ignition electrode 21 for performing spark discharge for ignition and a thermocouple 22 for monitoring the combustion state of the burner 10 are provided near the burner 10.

In addition, a thermistor 23 that detects the indoor temperature is provided in the suction port 4.

On the upper surface of the outer casing 2 of the gas warm air heater 1, an operation switch 24 for instructing start and stop of operation,
An operation display section covered with a resin opening / closing lid 25 is provided, and the operation display section contains a plurality of switches for instructing an operating state and a display device for displaying a target temperature and the like.

The gas warm air heater 1 configured as described above is controlled by the control device 30 shown in FIG.
The blast condition is controlled.

The control device 30 includes a microcomputer having various input / output circuits (hereinafter referred to as “microcomputer”) and a drive circuit for driving each part of the gas warm air heater 1 by the microcomputer. The operation control unit 31, the capacity determination unit 32, the proportional valve control unit 33, the fan control unit 34, the louver control unit 35, and some other functional units are formed.

The operation control unit 31 performs the operation start control in a predetermined sequence in accordance with the operation signal of the operation switch 24, and controls the burner.
The ignition control of 10 is started, and during combustion, the operation stop control is performed according to the operation signal of the operation switch 24, and predetermined digestion control is performed.

Further, following the ignition control, ignition detection by the thermocouple 22 is performed, and when the output voltage of the thermocouple 22 exceeds a certain voltage, it is determined as the ignition detection state.

In addition, during combustion, it is determined whether or not the combustion is normal by whether or not the output voltage of the thermocouple 22 is equal to or higher than a predetermined voltage. The digestion is controlled by discriminating the state.

In the operation start control, the pre-purge is performed for 3 seconds and then the burner 10 is ignited, and in the operation stop control, the post-purge is performed for about 20 seconds after the burner 10 is extinguished.

The capacity determination unit 32 determines a heating capacity that is a reference for determining the combustion amount of the burner 10 and the energization current value of the convection fan 8 from the temperature set by the setting switch 26 and the indoor temperature detected by the thermistor 23. To do.

Here, as the set temperature set by the setting switch 26, “L (corresponding to about 10 ° C.)”, “16 ° C.”,
"18 ℃", ..., "26 ℃", "H (for continuous strong operation)"
There are 8 steps every 2 ° C.

On the other hand, as the heating capacity to be determined, seven stages from level 1 which is the weakest heating capacity to level 7 which has the largest heating capacity as the rated heating amount are preset in advance, and are shown in FIG. Yes, setting switch 26
According to the temperature detected by the thermistor 23 with respect to the set temperature by, the heating capacity is determined from the temperature difference, and when "L" or "H" is set as the set temperature, respectively,
The heating capacity is determined to be level 7 or level 1 regardless of the detected temperature.

At the beginning of operation associated with the operation of the operation switch 26, in order to facilitate ignition of the burner 10, level 4
Is determined and ignition is detected, the supply amount of fuel gas is reduced to a predetermined amount (for example, 15 minutes) for a predetermined time (15 minutes) thereafter.
%) The level 8 as the maximum heating amount larger than the rated heating amount 7 to be increased is determined, and the rapid heating (hot dash) operation is performed, and after the predetermined time has passed or the room temperature reaches the predetermined temperature, the rapid heating is performed. After the (hot dash) operation ends, the temperature control operation is performed in which the heating capacity is determined based on the set temperature and the temperature detected by the thermistor 23.

In addition, the capacity determination unit 32 is provided with a save operation switch (not shown) for preventing overheating according to a user's request. When the save operation switch is operated during operation, a save operation (not shown) is performed. While the operating lamp is turned on, the set temperature is changed by 1 ° C. lower every 30 minutes, for example, after the temperature detected by the thermistor 23 reaches the set temperature.

The proportional valve control unit 33 drives and controls the proportional valve 18 according to the heating capacity determined by the capacity determination unit 32 and the correction value given by the variable resistor.

The fan control unit 34 drives and controls the convection fan 8 at a rotation speed according to the heating capacity determined by the capacity determination unit 32 and the correction value provided by the variable resistor.

In addition, the fan control unit 34, in order to further improve the heating feeling for the user when the rapid combustion switch 28 is operated to perform rapid combustion,
Room temperature T detected by 23 and rapid combustion switch 28
The convection fan 8 is controlled based on the combustion continuation time t after the operation of.

Therefore, here, some fuzzy variables Ai relating to the detected indoor temperature T and some fuzzy variables Bi relating to the combustion duration t are set in advance, and the indoor temperature T
And a fan fuzzy controller 34a having several fuzzy control rules Ri (i = 1, 2, ..., N) with the combustion duration t as the antecedent.

As the fuzzy variables Ai related to the detected room temperature T, room temperature is considerably low (ZO), room temperature is slightly low (PS),
Four types are set: room temperature is slightly higher (PM) and room temperature is considerably higher (PB). As fuzzy variables Bi for combustion duration t, immediately after the start of operation (ZO), some time has passed (PS) , The time has passed (PM) and the time has passed considerably (PB) are set. The membership function indicating the degree of membership (grade) for each fuzzy variable Ai, Bi is shown in Fig. 9. Expressed in a relationship.

FIG. 10 shows a fan fuzzy control rule Ri for outputting the rotation speed of the convection fan 8 by inputting the room temperature T and the combustion duration time t as described above.

Note that in the fuzzy variable Ci of the manipulated variable of the fan current as the output in Fig. 10, NB "decreases the rotation", ZO "can be left unchanged", PS "slightly raises the rotation", and PB "rotates the rotation". It raises considerably ", and the membership function of this fuzzy variable Ci is shown in FIG.

Fuzzy inference is performed from the above membership functions and fan fuzzy control rules Ri to obtain the manipulated variable ΔA of the fan current for controlling the convection fan 8.

Here, as the fuzzy inference, (1) the degree of conformity of the room temperature T and the combustion duration t as the premise of the fan-fuzzy control rule Ri to each fan-fuzzy control rule Ri is obtained,
(2) The inference result for each fan-fuzzy control rule Ri is obtained, and (3) each inference result is integrated and, for example, the inference result for the entire fan-fuzzy control rule Ri is calculated from its center of gravity.

FIG. 12 shows the manipulated variable ΔA of the fan current as a result of the inference based on the fan fuzzy control rule Ri.

As a result, if the minimum current value during rapid combustion is Amin,
The fan current A is the manipulated variable Δ of the fan current shown in FIG.
Given A, A = Amin + 2 × ΔA,
The DC motor 8b of the convection fan 8 is controlled by this fan current.

As a result, the room temperature T is checked at intervals of 2 minutes including the time of ignition, and the rotation speed of the convection fan 8 is adjusted.

The louver control unit 35 is a functional unit for driving and controlling the gad motor 9a provided in the louver 9, and each time the gad motor 9a driven in one direction is driven for a certain one-way time,
The louver 9 is opened by a crank mechanism (not shown) → half open →
The status changes in the order of closed → half open → open → half open → …….

Here, when the operation is started and stopped, the closed state is controlled at the time of ignition at the beginning of the operation according to the control state of the operation control unit 31, and the opening area of the hot air outlet 5 is reduced. Therefore, while the heating capacity determined by the capacity determining unit 32 is level 4 and the fuel gas is supplied in accordance with the heating capacity, the supply amount of the fuel air is relatively reduced, so that the mixing is performed. Qi becomes gas rich, which makes ignition easier.

Further, when the above-described rapid combustion operation is performed, the indoor temperature T detected by the thermistor 23 in order to prevent the floor surface from overheating while giving an effective heating feeling to the user,
The louver 9 is controlled to an open state, a closed state, or a half-open state according to the combustion duration time t after the start of operation.

Therefore, similar to the case of the fan control unit 34, some fuzzy variables Ai regarding the detected indoor temperature T and some fuzzy variables Bi regarding the combustion duration t are preset in the louver control unit 35, Some fuzzy control rules Rj with room temperature T and combustion duration t as the antecedent
Louver fuzzy control unit having (j = 1, 2, ..., N)
35a is provided, and the fuzzy variables Ai and Bi are, as in the case of the fan fuzzy control 34a, the fuzzy variables Ai related to the detected indoor temperature T, that is, room temperature is considerably low (ZO), and room temperature is slightly low. Four types are set: low (PS), room temperature is slightly high (PM), and room temperature is fairly high (PB). As fuzzy variables Bi for combustion duration t, immediately after the start of operation (ZO), a little time is set. Passed (P
S), time has passed (PM), and time has passed considerably (PB) are set. Each fuzzy variable A
The membership function indicating the degree of affiliation (grade) with respect to i and Bi is expressed by the relationship shown in FIG. 9 as in the case of the fan-fuzzy control 34a.

Louver fuzzy control rule for outputting the state of the louver 9 with the above room temperature T and combustion duration t as inputs
Rj is shown in FIG.

In FIG. 13, in the fuzzy variable Di relating to the state of the louver 9 as the output, NB is “lower the bed temperature”, ZO
"Is as it is", PS "raises the bed temperature slightly" and PB "raises the bed temperature considerably". The membership function of this fuzzy variable Di is shown in FIG.

From the above membership functions and louver fuzzy control rules Rj, the above-mentioned fuzzy inference is performed to obtain the driving amount ΔL of the louver for controlling the louver 9.

FIG. 15 shows the driving amount ΔL of the looper 9 as a result of the inference based on the louver fuzzy control rule Rj.

As a result, the room temperature T is checked at intervals of 2 minutes including the time of ignition, and the state of the louver 9 is adjusted.

Here, the adjustment method of the louver 9 is to open, close,
For each half-open state, the numbers Ln are set to 0 for the open state, 1 for the closed state, and 2 for the half-open state. For the number Ln indicating the state of the louver 9, Ln = Ln at 2 minute intervals. _-1 + La is calculated, and the gad motor 9a is driven according to the calculation result.

The above-mentioned La is a number for determining the state of the louver 9 which is determined based on the inference result shown in FIG. 15, and is La = −1 in the case of ΔL ≦ 2.0, and La = −1 in the case of 2.0 <ΔL <4.0. La = 0,
When ΔL ≧ 4.0, La = + 1 is given.

The louver 9 is initially set to "1".

Fuzzy inference is performed from the above membership functions and fan fuzzy control rules Ri to obtain the manipulated variable ΔA of the fan current for controlling the convection fan 8.

As a result, the room temperature T is checked at intervals of 2 minutes including ignition, and the state of the louver 9 is adjusted together with the rotation speed of the convection fan 8.

On the other hand, in the post-purge of the operation stop control, the amount of air that is maintained in the open state and passes through the convection duct 7 is increased so that the burner 10 and the convection duct 7 can be rapidly cooled, and the post-purge is closed. Driven to the state.

As a result, when the ignition operation is performed, it is not necessary to close it again, and the operation start operation such as pre-purge can be promptly started.

As described above, according to the gas warm air heater 1 of the present embodiment, the convection fan 8 and the louver 9 are controlled by the fuzzy inference based on the detected indoor temperature T and the combustion duration time t after the start of operation. Therefore, the temperature of the blown warm air does not give a comfortable heating feeling to the user and does not give a feeling of cold air, and since the floor surface is heated appropriately, a comfortable heating feeling from the floor surface is obtained. Can be given.

In this embodiment, the number of libels of the heating capacity is set to 7 levels, but the number of levels of the heating capacity is set to a large number and the proportional control is also applicable.

In the present embodiment, the warm air heater that mixes the combustion gas with the room air and blows it into the room is shown, but the combustion air is sucked from the outside to exhaust the combustion gas to the outside, and the heat exchanged temperature A forced air supply / exhaust type (FF type) hot air heater that blows air into the room may be used.

In the above embodiment, the one provided with only the convection fan is shown, but a blower for supplying the combustion air may be separately provided.

 The fuel may be petroleum.

[Brief description of drawings]

FIG. 1 is a block diagram showing a functional configuration of a control device for a gas warm air heater according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a front surface of the gas warm air heater according to this embodiment, and FIG. Is a perspective view showing the rear surface of the gas hot air heater of the present embodiment, FIG. 4 is a configuration diagram showing a schematic structure of the gas hot air heater of the present embodiment, and FIG. 5 is a closed state of the louver of the present embodiment. 6 is a partial front view of the gas warm air heater, FIG. 6 is a partial front view of the gas warm air heater showing the open state of the louver of this embodiment, and FIG. 7 is a half open state of the louver of this embodiment. FIG. 8 is a partial cross-sectional view of the gas warm air heater, FIG. 8 is a characteristic diagram showing the determining characteristics of the heating capacity in the capacity determining unit of the control device of this embodiment, and FIG. Characteristic diagram showing membership functions of fuzzy variables related to duration, Fig. 10 shows fan fuzzy control FIG. 11 is a characteristic diagram showing the rules, FIG. 11 is a characteristic diagram showing the membership function of the manipulated variable of the fan current as the output by the fan fuzzy control rule, and FIG. 12 is the fan as the inference result by the fan fuzzy control rule of the present embodiment. FIG. 13 is a characteristic diagram showing the manipulated variable of the electric current, FIG. 13 is a characteristic diagram showing the louver fuzzy control rule, FIG. 14 is a characteristic diagram showing the membership function of the driving amount of the louver as an output by the louver fuzzy control rule, FIG. FIG. 9 is a characteristic diagram showing a driving amount of a louver as an inference result by the louver fuzzy control rule of the present embodiment. In the figure, 1 ... Gas warm air heater (heater), 3 ... Indoor air inlet, 5 ... Warm air outlet, 7 ... Convection duct (casing), 8 ... Convection fan (blower), 9 ... Louver, 10 ... Burner (heating source), 23 ... Thermistor (temperature detection means), 26 ... Setting switch (temperature setting means), 34
...... Fan control section (blower control means), 35 …… louver control section (louver control means).

Claims (3)

[Claims] 1. A blower and a heating source are arranged in a casing having an indoor air intake and a hot air outlet, and based on a target temperature by a temperature setting means and an indoor temperature detected by a temperature detecting means. In a warm air heater controlling each of the heating source and the blower, a louver for changing the direction of the warm air blown forward from the warm air outlet at least at the front lower side when the heating source is operated, According to the indoor temperature detected by the temperature detection means, the lower the indoor temperature is, the direction of the warm air blown forward from the hot air outlet becomes lower front, and the operation duration of the heating source. In accordance with the above, the louver control means for controlling the louver so that the direction of the warm air blown forward from the hot air blowout port becomes lower forward as the operation duration time becomes shorter. Warm-air heating machine for. 2. The warm air according to claim 1, wherein the louver control means controls the louver according to a fuzzy control rule based on a fuzzy variable relating to the room temperature and a fuzzy variable relating to the operation duration time. heater. 3. A blower control means for controlling the blower according to a fuzzy control rule based on a fuzzy variable relating to the room temperature and a fuzzy variable relating to the operation duration time. The hot air heater according to any one of 1.