JP6715668B2 - Hybrid hot air heater - Google Patents

Description

The present invention relates to a burner that burns fuel gas, a blower for combustion heating that takes in air in a heating target space, mixes the taken-in air and the combustion gas of the burner, and blows the mixed gas into the heating target space. And a blower for electric heating, which takes in air from the heating target space and blows out the taken-in air to the heating target space, and air blown by the electric heating blower. The present invention relates to a hybrid warm air heater including a heating unit having an electric heating unit having an electric heater for heating the.

Patent Document 1 describes a hybrid hot air heater including a combustion heating unit and an electric heating unit. In this hybrid hot air heater, the combustion type heating unit is always operated during the heating operation, and the electric type heating unit is configured to operate only during the standing heating. That is, in the hybrid hot air heater described in Patent Document 1, both the combustion heating unit and the electric heating unit operate during startup heating, and only the combustion heating unit operates during periods other than startup heating.

Comparing the heating cost by the combustion type heating unit and the heating cost by the electric type heating unit, the heating cost by the electric type heating unit is, for example, the heating by the combustion type heating unit when city gas is used as fuel, due to the difference in energy unit price. The cost for obtaining the same amount of heat is about 2.5 times higher than the cost.
Therefore, in the hybrid hot-air heater described in Patent Document 1, the timing at which the electric heating unit, which increases the heating cost, is limited to a short time only during start-up heating, so the electric heating unit starts up. The energy cost for heating can be suppressed as compared with the case of operating even when the heating is not performed.

JP-A-5-034010

Like the hybrid warm air heater described in Patent Document 1, if the timing at which the electric heating unit operates is limited to a short time only during start-up heating, heating is performed when the heating load is high, such as in the midwinter. There is a possibility that the temperature of the space to be heated cannot be maintained at the target temperature due to insufficient heating output by the means.
However, if the electric heating unit is always operated during the heating operation, there is a problem that the heating cost increases as described above.

The present invention has been made in view of the above problems, and an object thereof is to provide a hybrid hot-air heater that can suppress an increase in heating cost while sufficiently securing a heating output by a heating unit. is there.

A characteristic configuration of a hybrid hot air heater according to the present invention for achieving the above object is a burner that burns fuel gas, and takes in air in a heating target space, and takes in the taken air and combustion gas of the burner. A combustion type heating unit having a combustion type air blower that acts as a blower to mix and blow out to the heating target space, and to take in the air of the heating target space and blow out the taken-in air to the heating target space. A heating means having an electric heating part having an electric heating blower that acts on the air, and an electric heater that heats air ventilated by the electric heating blower; and
Temperature measuring means for measuring the temperature of the heating target space, and
A hybrid hot-air heater provided with operation control means for controlling operation,
In the hybrid mode in which the combustion heating unit and the electric heating unit are used in combination , the operation control unit measures the temperature of the air measured by the temperature measurement unit so that the temperature of the air reaches a predetermined target temperature. Based on the temperature difference between the temperature of the air to be heated and the target temperature, an output determination process for determining the target heating output of the heating means from between the minimum heating output and the maximum heating output is performed, and the output determination process is performed. Operating the heating means to exert the target heating output,
The operation control means, in the output determination process,
When the target heating output of the heating means is less than or equal to a predetermined midway heating output between the minimum heating output and the maximum heating output, the electric heating unit does not operate, and the combustion heating unit is the lowest. Operating the heating means in a state in which it operates to exert a predetermined combustion heating output between the combustion heating output and the maximum combustion heating output,
When the target heating output of the heating means is larger than the midway heating output, the combustion type heating unit operates so as to exhibit the maximum combustion heating output, and the electric heating unit has a minimum electric heating output and a maximum electric heating output. Operating the heating means in a state in which it operates so as to exhibit a predetermined electric heating output between the electric heating output ,
The operation control means, in the output determination process, when a predetermined electric heating suppression condition for suppressing the electric heating output of the electric heating unit is satisfied, a predetermined suppression maximum less than the maximum electric heating output. Determine the electric heating output of the electric heating unit with the output as the upper limit,
The operation control means, in the output determination process, when the temperature of the air measured by the temperature measuring means at the start or during the operation of the heating means is equal to or higher than a set temperature, the electric heating suppression condition is satisfied. There is a point to judge .

According to the above-mentioned characteristic configuration, when the target heating output of the heating means is set between the minimum heating output and the predetermined midway heating output, only the combustion type heating unit operates, so that an increase in heating cost can be suppressed. On the other hand, when the target heating output of the heating means is set between the predetermined midway heating output and the maximum heating output, both the combustion heating section and the electric heating section operate, so that the heating output by the heating means is increased. Can be secured sufficiently.
When increasing the target heating output of the heating means, the combustion heating output of the combustion type heating unit is preferentially increased until the target heating output reaches the midway heating output, and the target heating output is higher than the midway heating output. Then, the electric heating output of the electric heating unit is increased. On the other hand, when the target heating output of the heating means is reduced, the electric heating output of the electric heating unit is preferentially decreased until the target heating output reaches the midway heating output, and the target heating output is reduced to the midway heating. When the output falls below the output, the combustion heating output of the combustion type heating unit is reduced. That is, when the target heating output of the heating means is increased, the combustion heating output of the combustion type heating section is preferentially increased, and when the target heating output of the heating means is decreased, the electric heating output of the electric heating section is preferentially decreased. The combustion type heating unit and the electric heating unit are operated so as to perform the above.
Therefore, it is possible to provide a hybrid hot air heater capable of suppressing an increase in heating cost while sufficiently securing the heating output by the heating means.
Further, when the predetermined electric heating suppression condition is satisfied, the electric heating output of the electric heating unit is limited to a predetermined maximum output during suppression that is less than the maximum electric heating output. That is, the electric heating output of the electric heating unit is suppressed and the heating cost is also suppressed.
Furthermore, when the temperature of the air measured by the temperature measuring means is equal to or higher than the set temperature at the time of starting or during the operation of the heating means, the electric heating output of the electric heating part is less than the maximum electric heating output at a predetermined suppression time. The maximum output is set as the upper limit. That is, in a high temperature situation where the temperature of the air measured by the temperature measuring means is equal to or higher than the set temperature, the heating output by the heating means does not become insufficient even if the output of the electric heating unit is small, The heating cost can be reduced by reducing the output of the heating unit.

A characteristic configuration of a hybrid hot air heater according to the present invention for achieving the above object is a burner that burns fuel gas, and takes in air in a heating target space, and takes in the taken air and combustion gas of the burner. A combustion type heating unit having a combustion type air blower that acts as a blower to mix and blow out to the heating target space, and to take in the air of the heating target space and blow out the taken-in air to the heating target space. A heating means having an electric heating part having an electric heating blower that acts on the air, and an electric heater that heats air ventilated by the electric heating blower; and
Temperature measuring means for measuring the temperature of the heating target space, and
A hybrid hot-air heater provided with operation control means for controlling operation,
In the hybrid mode in which the combustion heating unit and the electric heating unit are used in combination, the operation control unit measures the temperature of the air measured by the temperature measurement unit so that the temperature of the air reaches a predetermined target temperature. Based on the temperature difference between the temperature of the air to be heated and the target temperature, an output determination process for determining the target heating output of the heating means from between the minimum heating output and the maximum heating output is performed, and the output determination process is performed. Operating the heating means to exert the target heating output,
The operation control means, in the output determination process,
When the target heating output of the heating means is less than or equal to a predetermined midway heating output between the minimum heating output and the maximum heating output, the electric heating unit does not operate, and the combustion heating unit is the lowest. Operating the heating means in a state in which it operates to exert a predetermined combustion heating output between the combustion heating output and the maximum combustion heating output,
When the target heating output of the heating means is larger than the midway heating output, the combustion type heating unit operates so as to exhibit the maximum combustion heating output, and the electric heating unit has a minimum electric heating output and a maximum electric heating output. Operating the heating means in a state in which it operates so as to exhibit a predetermined electric heating output between the electric heating output,
The operation control means, in the output determination process, when a predetermined electric heating suppression condition for suppressing the electric heating output of the electric heating unit is satisfied, a predetermined suppression maximum less than the maximum electric heating output. Determine the electric heating output of the electric heating unit with the output as the upper limit ,
The operation control means, in the output determination process, when the temperature difference between the temperature of the air measured by the temperature measuring means and the target temperature at the start or during the operation of the heating means is a set temperature difference or less, The point is that it is determined that the electric heating suppression condition is satisfied .

According to the above-mentioned characteristic configuration, when the target heating output of the heating means is set between the minimum heating output and the predetermined midway heating output, only the combustion type heating unit operates, so that an increase in heating cost can be suppressed. On the other hand, when the target heating output of the heating means is set between the predetermined midway heating output and the maximum heating output, both the combustion heating section and the electric heating section operate, so that the heating output by the heating means is increased. Can be secured sufficiently.
When increasing the target heating output of the heating means, the combustion heating output of the combustion type heating unit is preferentially increased until the target heating output reaches the midway heating output, and the target heating output is higher than the midway heating output. Then, the electric heating output of the electric heating unit is increased. On the other hand, when the target heating output of the heating means is reduced, the electric heating output of the electric heating unit is preferentially decreased until the target heating output reaches the midway heating output, and the target heating output is reduced to the midway heating. When the output falls below the output, the combustion heating output of the combustion type heating unit is reduced. That is, when the target heating output of the heating means is increased, the combustion heating output of the combustion type heating section is preferentially increased, and when the target heating output of the heating means is decreased, the electric heating output of the electric heating section is preferentially decreased. The combustion type heating unit and the electric heating unit are operated so as to perform the above.
Therefore, it is possible to provide a hybrid hot air heater capable of suppressing an increase in heating cost while sufficiently securing the heating output by the heating means.
Further, when the predetermined electric heating suppression condition is satisfied, the electric heating output of the electric heating unit is limited to a predetermined maximum output during suppression that is less than the maximum electric heating output. That is, the electric heating output of the electric heating unit is suppressed and the heating cost is also suppressed.
Furthermore, when the temperature difference between the temperature of the air measured by the temperature measuring means and the target temperature at the time of starting or during the operation of the heating means is less than or equal to the set temperature difference, the electric heating output of the electric heating section is the maximum electric power. The maximum output at the time of predetermined suppression below the heating output is set as the upper limit. In other words, if the temperature is high such that the temperature difference between the temperature of the air measured by the temperature measuring unit and the target temperature is less than or equal to the set temperature difference, the heating output by the heating unit will be small even if the output of the electric heating unit is small. Since there is no shortage, it is possible to obtain the effect of reducing the heating cost by reducing the output of the electric heating unit.

Still another characteristic configuration of the hybrid warm air heater according to the present invention is such that the higher the temperature of the air measured by the temperature measuring means at the time of starting or during the operation of the heating means, the smaller the maximum output during suppression. It is in the point of being set to a value.

The higher the temperature of the air measured by the temperature measuring means, the smaller the heating output required for the heating means. Therefore, in this characteristic configuration, the higher the temperature of the air measured by the temperature measuring means, the higher the maximum output of the electric heating unit. Set (Maximum output during suppression) to a small value. As a result, it is possible to obtain a large effect of reducing the heating cost by reducing the output of the electric heating unit.

Yet another characteristic configuration of the hybrid hot-air heater according to the present invention is characterized in that the operation control means, in the output determination processing, of the air measured by the temperature measuring means at the start or during the operation of the heating means. When the temperature difference between the temperature and the target temperature is less than or equal to the set temperature difference, it is determined that the electric heating suppression condition is satisfied.

According to the above characteristic configuration, when the temperature difference between the temperature of the air measured by the temperature measuring means and the target temperature at the time of starting or during the operation of the heating means is equal to or less than the set temperature difference, the electric heating output of the electric heating unit is set. The upper limit is the maximum output during the predetermined suppression below the maximum electric heating output. In other words, if the temperature is high such that the temperature difference between the temperature of the air measured by the temperature measuring unit and the target temperature is less than or equal to the set temperature difference, the heating output by the heating unit will be small even if the output of the electric heating unit is small. Since there is no shortage, it is possible to obtain the effect of reducing the heating cost by reducing the output of the electric heating unit.

Yet another characteristic configuration of the hybrid hot air heater according to the present invention is such that the smaller the temperature difference between the temperature of the air measured by the temperature measuring means and the target temperature at the time of starting or during the operation of the heating means, the smaller the temperature difference. The maximum output during suppression is set to a small value.

The smaller the temperature difference between the temperature of the air measured by the temperature measuring means and the target temperature, the smaller the heating output required for the heating means.
Therefore, in this characteristic configuration, the smaller the temperature difference between the temperature of the air measured by the temperature measuring means and the target temperature, the smaller the maximum output of the electric heating unit (maximum output during suppression) is set. As a result, it is possible to obtain a large effect of reducing the heating cost by reducing the output of the electric heating unit.

Yet another characteristic configuration of the hybrid hot-air heater according to the present invention includes a suppression instruction receiving unit that receives an instruction from a user to suppress the electric heating output of the electric heating unit,
In the output determination process, the operation control unit determines that the electric heating suppression condition is satisfied when the suppression instruction receiving unit receives an instruction to suppress the electric heating output of the electric heating unit from the user. There is a point to judge.

According to the above characteristic configuration, when the instruction to suppress the electric heating output of the electric heating unit is received from the user, the electric heating output of the electric heating unit is less than the predetermined electric heating output at a predetermined suppression time. The maximum output is set as the upper limit.

It is a perspective view showing the appearance of a hybrid warm air heater. It is a vertical right side view of a hybrid type warm air heater. It is a vertical front view of a hybrid type warm air heater. It is a figure which shows the operating part of a hybrid type warm air heater. It is a block diagram which shows the control structure of a hybrid type warm air heater. It is a flow chart explaining operation in hybrid type heating of a 1st embodiment. It is a flow chart explaining operation by hybrid type heating of a 2nd embodiment. It is a flow chart explaining operation by hybrid heating of a 3rd embodiment.

<First Embodiment>
Hereinafter, a hybrid hot air heater according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the external appearance of a hybrid hot air heater, FIG. 2 is a vertical right side view of the hybrid hot air heater, and FIG. 3 is a vertical front view of the hybrid hot air heater. .. Further, FIG. 4 is a diagram showing an operation unit of the hybrid warm air heater, and FIG. 5 is a block diagram showing a control configuration of the hybrid warm air heater. As shown in the figure, the hybrid hot air heater takes in a gas burner 1 (an example of a burner) that burns fuel gas, and takes in the air in the space to be heated, and mixes the taken-in air with the combustion gas of the gas burner 1. And a combustion type heating unit Hf having a blower 2 for the combustion type heating that blows air into the heating target space, and takes in air from the heating target space and blows the taken air into the heating target space. Electric heating unit He including an electric heating blower 3 and a sheathed heater 4 (an example of an electric heater) that heats air ventilated by the electric heating blower 3, and an operation control unit that controls operation 5 (an example of operation control means), and an operation unit 6 for transmitting various control information to the operation control unit 5 and the like.

In this embodiment, the sheathed heater 4 is arranged in a ventilation area in which ventilation is performed by the ventilation effect of the combustion heating fan 2, and is shared by the combustion heating fan 2 and the electric heating fan 3. 7 is provided.

Hereinafter, each part of the hybrid warm air heater will be described. In the following description, when describing the shape of each member, the positional relationship of each member, and the like by using the left, right, front, and rear directions, the left, right, front, back, and top and bottom directions are as shown in FIGS. In each drawing, the direction corresponding to each member will be described.
As shown in FIGS. 1 to 3, in a main body case 10 provided with an intake port 8 and a hot air outlet 9, warm air that communicates with the intake port 8 on the upstream side and with the hot air outlet 9 on the downstream side. A ventilation passage 11 is provided, and a combustion unit U including a gas burner 1 is arranged in the warm ventilation passage 11 so that combustion gas can be blown to the warm ventilation passage 11. The main body case 10 is configured in a thin shape in which the dimension in the front-rear direction is smaller than the dimension in the left-right direction, the warm air outlet 9 is provided in the lower part of the front surface of the main body case 10, and the intake port 8 is provided in It is provided at a position above the upper edge of the warm air outlet 9 in the height direction on the rear surface. The intake port 8 is provided with an air filter 24 for capturing dust.

The combustion unit U includes a gas burner 1 and a combustion chamber 12 for burning the fuel gas ejected from the flame holes 1h of the gas burner 1. The gas burner 1 is a Bunsen combustion type, and a gas nozzle 1n for ejecting the fuel gas supplied through the fuel supply passage 15, the fuel gas being ejected from the gas nozzle 1n, and a primary action due to the suction action accompanying the ejection of the fuel gas. It is configured to include a mixing pipe 1p to which combustion air is supplied, a gas burner main body 1m having a plurality of flame holes 1h for ejecting a mixed gas supplied from the mixing pipe 1p in a row, and the like. The gas burner main body 1m is formed in an elongated shape that is long in the left-right direction, and is connected in a communication state above the mixing pipe 1p so that the air-fuel mixture is supplied to the internal space of the gas burner main body 1m. A plurality of flame holes 1h are formed in a row along the left-right direction on the upper surface of 1 m.

In this embodiment, as the combustion chamber 12, a lower stage combustion chamber 12A having a lower stage air intake 13A below and a lower stage combustion gas outlet 14A above, and an upper stage air intake 13B below. The upper-stage combustion chamber 12B having the upper-stage combustion gas outlet 14B is provided side by side in the vertical direction with the lower-stage combustion gas outlet 14A facing the upper-stage combustion chamber 12B. Then, in the lower combustion chamber 12A, the fuel gas ejected from the flame hole 1h of the gas burner 1 is primarily burned by the secondary combustion air introduced from the lower air intake 13A, and in the upper combustion chamber 12B, the lower combustion chamber The unburned fuel gas introduced together with the combustion gas from the combustion gas outlet 14A is configured to be secondarily burned by the secondary combustion air introduced from the upper air intake 13B. It is configured as a staged combustion type.

The upper combustion chamber forming body 16 in which the upper combustion chamber 12B is formed is thin and has a dimension in the front-rear direction smaller than the dimension in the left-right direction, and is configured in a box shape having a rectangular cross-sectional shape that is long in the left-right direction. At the lower part of the rear surface, an elongated opening 17 for rearward communication which is elongated in the left-right direction is provided, and an elongated upper combustion gas outlet 14B which is elongated in the left-right direction is provided on the upper surface. The bottom of the upper combustion chamber forming body 16 has a vertical cross-sectional shape when viewed in the left-right direction, and is configured to have a substantially V-shaped gutter shape.

The lower combustion chamber forming body 18 in which the lower combustion chamber 12A is formed has a lateral dimension equivalent to that of the upper combustion chamber forming body 16 and a longitudinal dimension and height smaller than that of the upper combustion chamber forming body 16. Of a rectangular parallelepiped box shape, and an elongated (long sideways) gas burner insertion hole 19 into which the gas burner body 1m of the gas burner 1 is inserted in the lower surface of the lower combustion chamber forming body 18, and Elongated (longer in the left and right) lower stage air intakes 13A located at the front and rear of the gas burner insertion hole 19 are provided, and an elongated (longer in the left and right) lower stage combustion gas blower is provided on the upper surface. An outlet 14A is provided. Then, the gas burner 1 is supported by the lower combustion chamber forming body 18 with the gas burner body 1m inserted in the gas burner insertion hole 19 in a posture in which the arrangement direction of the flame holes 1h is along the left-right direction.

Inside the upper combustion chamber forming body 16, the lower combustion chamber forming body 18 supporting the gas burner 1 is positioned slightly above the communication opening 17 and substantially in the center of the front-rear direction, and the longitudinal direction thereof is The upper combustion chamber forming body 16 is arranged in a posture along the longitudinal direction. A region inside the upper combustion chamber forming body 16 that extends in front of, above, and behind the lower combustion chamber forming body 18 is referred to as an upper combustion chamber 12B, and the inner surface of the front wall portion of the upper combustion chamber forming body 16 and the lower combustion chamber 12B. The elongated (longer in the left-right direction) opening formed at the lower edge of the front wall portion of the forming body 18, the inner surface of the rear wall portion of the upper combustion chamber forming body 16 and the rear side of the lower combustion chamber forming body 18. Each elongated opening (long in the left-right direction) formed at the lower edge of the wall is used as the upper air intake 13B.

The combustion unit U configured as described above is disposed inside the main body case 10 with the communication opening 17 thereof facing the intermediate portion of the intake port 8 which is lower in the vertical direction. In the main body case 10, a ventilation passage forming body 20 forming a warm air ventilation passage 11 extends forward from the upper edge portion of the intake port 8 in a state of covering the upper side of the combustion unit U, bends downward, and further The unit U is provided so as to extend downward in a state of covering the front of the unit U and to be continuous with the upper edge of the warm air outlet 9. Then, the warm air ventilation passage 11 is formed by the ventilation passage formation body 20 so as to extend forward above the combustion unit U, bend downward, and further extend forward below the combustion unit U.

Further, the flow distribution plate 21 having a mountain-shaped vertical cross-sectional view when viewed in the left-right direction divides the warm air ventilation passage 11 between the combustion unit U and the ventilation passage forming body 20 into two parts in the vertical direction. It is provided inside the main body case 10 in a state of being located at.

The common blower 7 is configured by a cross flow fan including a blade body 7f that sucks and blows air in a direction orthogonal to the rotation axis core, and a fan drive motor 7m that rotationally drives the blade body 7f with the rotation axis core. Has been done. A fan case 22 accommodating the blades 7f of the blower 7 is provided in the main body case 10 over the lower end edge of the intake port 8 and the lower end edge of the warm air outlet 9. The fan case 22 has an elongated gutter shape having a substantially semicircular vertical cross-sectional shape when viewed in the left-right direction, and a plate-shaped edge portion 22e extending outward in the radial direction is provided on the rear side of the fan case 22.

Such a fan case 22 is arranged such that its longitudinal direction is along the left-right direction, its opening is directed obliquely upward and forward, and the lower end of the ventilation passage forming body 20 and the lower end of the upper combustion chamber forming body 16 are formed. The rear end edge (the end edge of the plate-shaped edge portion 22e) is connected to the lower end edge of the intake port 8 and the front end edge is connected to the warm air outlet 9 It is provided in the main body case 10 in a state where the lower end edges of the are connected. Then, by the rearward tilting plate-like portion of the gutter-shaped bottom portion of the upper combustion chamber forming body 16 and the plate-like edge portion 22e on the rear side of the fan case 22, the intake port 8 is connected to the lower combustion chamber 12A and the upper stage. A bypass air passage 23 that bypasses the combustion chamber 12B and communicates with the warm air passage 11 is formed.

The blade body 7f of the common blower 7 is rotatably supported in a state where the blade body 7f is located inside the fan case 22 with the axis of rotation along the horizontal direction. Then, by rotating the blade body 7f by the fan driving motor 7m, the suction action of the common blower 7 acts on the downstream side of the warm air ventilation passage 11 and the bypass air passage 23. It is configured.

The sheathed heater 4 is bent in a U-shape having two linear portions 4p in parallel with each other, and the U-shaped sheathed heater 4 extends in the left-right direction along the longitudinal direction of each linear portion 4p. In the combined posture, the air is arranged in the air flow area between the rear wall portion of the upper combustion chamber forming body 16 and the rear wall portion of the lower combustion chamber forming body 18 in the upper combustion chamber 12B.

Next, the combustion mode of the two-stage combustion type gas burner 1 and the generation mode of hot air by the gas burner 1 will be described.
By operating the common blower 7, suction is exerted on the intake port 8 and the upper combustion gas outlet 14B through the warm air ventilation passage 11, and the upper combustion gas outlet 14B, the upper combustion chamber 12B, and the upper air intake. 13B and the opening 17 for communication, suction action is performed on the intake port 8, and the upper stage combustion gas outlet 14B, the upper stage combustion chamber 12B, the lower stage combustion gas outlet 14A, the lower stage combustion chamber 12A, the lower stage air intake. The suction action is exerted on the intake port 8 through 13A and the communication opening 17, and the suction action is exerted on the intake port 8 through the bypass air passage 23. Then, the air taken in from the intake port 8 is directly introduced to the upstream end of the warm air ventilation passage 11 and also through the communication opening 17 to the lower combustion chamber 12A from the lower air intake 13A. While being introduced as secondary combustion air, it is introduced as secondary combustion air from the upper air intake 13B into the upper combustion chamber 12B, and further, through the bypass air passage 23, the lower combustion chamber 12A and the upper stage. It is introduced into the warm air ventilation passage 11 by bypassing the combustion chamber 12B.

The air-fuel mixture ejected from the plurality of flame holes 1h of the gas burner 1 is primarily burned in the lower combustion chamber 12 by the secondary combustion air introduced from the lower air intake 13A to form the primary flame Fa. Further, the combustion gas by the primary combustion and the unburned fuel gas in the primary combustion are blown out from the lower-stage combustion gas outlet 14A into the upper-stage combustion chamber 12B, and the unburned fuel in the upper-stage combustion chamber 12B. The gas is secondarily burned by the secondary combustion air introduced from the upper air intake 13B, and the secondary flame Fb is formed. Then, the combustion gas from the primary combustion and the combustion gas from the secondary combustion are blown out from the upper stage combustion gas outlet 14B to the warm air ventilation passage 11 and are directly introduced from the intake port 8 to the upstream end of the warm air ventilation passage 11. Warm air is generated by being mixed with air, the warm air passes through the warm air ventilation passage 11, and the air taken directly from the intake port 8 through the bypass air passage 23 is mixed in the middle of the hot air blowing port 9 while being mixed. It is blown out of the body case 10.

Further, by operating the sheath heater 4, the air flowing in the upper combustion chamber 12B is heated. That is, the inside of the upper combustion chamber 12B is a ventilation region in which ventilation is performed by the ventilation action of the common blower 7 as the combustion type blower 2, and the sheath heater 4 is arranged in such a ventilation region.

Next, a mode of generating warm air by the sheath heater 4 will be described.
By operating the common blower 7, in the same manner as the warm air generation mode by the gas burner 1 described above, the suction action is applied to the intake port 8 and the upper combustion gas outlet 14B through the warm air ventilation passage 11. Then, the upper stage combustion gas outlet 14B, the upper stage combustion chamber 12B, the upper stage air intake 13B and the communication opening 17 suction the intake port 8, and the upper stage combustion gas outlet 14B and the upper stage combustion chamber. 12B, lower-stage combustion gas outlet 14A, lower-stage combustion chamber 12A, lower-stage air intake 13A, and suction opening 8 through the communication opening 17, and suction to intake opening 8 through bypass air passage 23. To work.
Then, the air taken in from the intake port 8 is introduced into the upper combustion chamber 12B from the upper air intake 13B through the communication opening 17 and heated by the sheath heater 4, and then the lower combustion. Air mixed with the air blown from the gas outlet 14A, blown out from the upper combustion gas outlet 14B to the warm air ventilation passage 11, and introduced from the intake port 8 directly to the upstream end of the warm air ventilation passage 11 The mixed hot air is generated, the hot air passes through the hot air passage 11, and the air taken directly from the intake port 8 through the bypass air passage 23 is mixed in the middle of the hot air outlet 9 from the main body case. 10 is blown out.

As shown in FIG. 2, a room temperature sensor 25 (an example of the temperature measuring means of the present invention) that detects the temperature of the air sucked from the intake port 8 as the room temperature is provided in the main body case 10. To prevent overheating of the hybrid warm air heater, an air passage temperature sensor 26 is provided on the outer surface of the air passage forming body 20 so as to detect the temperature in the hot air passage 11 and from the air passage forming body 20. A thermal fuse 27 is provided so that it can be heated by heat transfer. As shown in FIG. 3, a flame sensor 28 that detects a flame (primary flame Fa) formed in the gas burner 1 is provided.

Further, as shown in FIG. 3, the fuel supply passage 15 is provided with a fuel disconnecting valve 29 for connecting and disconnecting the supply of the fuel gas to the gas burner 1, and a fuel adjusting device for adjusting the supply amount of the fuel gas to the gas burner 1. A valve 30 is provided. By the way, the fuel cutoff valve 29 is a solenoid valve, and the fuel control valve 30 is a proportional solenoid valve. An igniter 31 for igniting the gas burner 1 is provided near the upper portion of the gas burner body 1 m of the gas burner 1.

As shown in FIG. 1, the operation unit 6 is provided on the upper surface of the main body case 10, and as shown in FIG. 4, the operation unit 6 is instructed to start and stop the operation of the hybrid hot air heater. Main operation switch 41, sleep timer operation that stops the operation when the stop time condition is satisfied, sleep timer switch 42, sleep operation that starts when the start time condition is satisfied, good morning timer switch 43 , An electric heater operation switch 44 for instructing the start and stop of heating by the electric heating unit He (hereinafter, also referred to as electric heating operation), and a heater output that is the output of the sheath heater 4 in a plurality of stages (this implementation). In the form, the heater output changeover switch 45 that can be set to two levels (strong and weak), the target temperature of the heating operation, the sleep timer time for executing the sleep timer operation, and the time interval until the start of the sleep timer operation are set. A temperature/time setting switch 46 to be set, a hybrid switch 47 that permits operation of hybrid heating that simultaneously operates both the combustion heating unit Hf and the electric heating unit He, and suppresses electric heating output of the electric heating unit He. An eco switch (an example of suppression instruction receiving means of the present invention) 48 for receiving an instruction to perform from a user is provided.

Further, in the operation unit 6, an operation lamp 51 that is turned on during operation of the hybrid warm air heater, a night timer 52 that is turned on during setting of the good night timer operation, and a light is turned on during setting of the good morning timer operation. Good morning timer lamp 53, heater operation lamp 54 that is turned on during execution of electric heating operation, heater output lamp 55 that displays the heater output set by heater output selector switch 45, and temperature/time setting switch 46. Temperature/time display unit 56 that displays the temperature and time set by the above, a hybrid lamp 57 that is turned on when the hybrid heating operation is permitted, and a light that is turned on when the eco switch 48 is turned on. An eco lamp 58 and the like are provided.

The user can set the target temperature for the heating operation by pressing the temperature/time setting switch 46. For example, the user can set the temperature from 12°C to 26°C as the target temperature in 1°C increments. In addition, the user can set “L (low)” as the setting state corresponding to the set temperature lower than 12° C. and “H (high)” as the setting state corresponding to the set temperature higher than 26° C. Can be set. For example, when “L (low)” is set, the target temperature for heating operation is a low temperature such as 10° C., and when “H (high)” is set, the target temperature for heating operation is 40° C. High temperature such as.

Next, the control operation of the operation control unit 5 will be described.
As shown in FIG. 5, the operation control unit 5 includes a main operation switch 41, a good night timer switch 42, a good morning timer switch 43, an electric heater operation switch 44, a heater output changeover switch 45, a temperature/time setting switch 46, and a hybrid switch. The command information from various switches such as 47 and the eco switch 48, and the detection information from various sensors such as the room temperature sensor 25, the ventilation path temperature sensor 26, and the flame sensor 28 are input.

The operation control unit 5 controls the sheath heater 4, the igniter 31, the fan drive motor 7m, the fuel interrupt valve 29, the fuel adjustment valve 30, and the like based on the command information input from various switches and the detection information from various sensors. Various devices, operation lamp 51, good night timer lamp 52, good morning timer lamp 53, heater operation lamp 54 and heater output lamp 55, hybrid lamp 57, eco lamp 58, and other lamps, as well as the operation of temperature/time display unit 56, etc. By controlling, the operation of the hybrid hot air heater is controlled.

Specifically, the operation control unit 5 operates the gas combustion type heating unit Hf by operating the gas combustion type heating operation, the electric heating unit He by operating the electric heating operation, the combustion type heating unit Hf, and the electric type heating operation. Hybrid heating operation that allows simultaneous operation of the heating unit He, sleep timer operation that stops operation when the stop time condition is satisfied, and various kinds of good morning timer operation that start operation when the start time condition is satisfied Alternatively, it is configured to be executable.
In addition, the operation control unit 5 stops the combustion of the gas burner 1 when the time during which the gas burner 1 is continuously burned reaches a predetermined allowable continuous combustion operation time in each of the good night timer operation and the good morning timer operation. It is configured. By the way, the allowable continuous combustion operation time is set to an upper limit time during which the combustion-type heating unit Hf can be safely and continuously operated without ventilating the heating target space, and in this embodiment, for example, is set to 60 minutes.

Hereinafter, each operation of the combustion heating operation, the electric heating operation, and the hybrid heating operation will be described.

[Combustion heating operation]
When the operation start is commanded by the main operation switch 41, the operation control unit 5 operates the fan driving motor 7m, opens the fuel interrupt valve 29 and the fuel adjustment valve 30, and turns on the igniter 31. By performing the ignition process to operate and burning the gas burner 1, the gas combustion type heating operation for blowing out the warm air generated by the combustion gas of the gas burner 1 into the room is started, and the operation lamp 51 is turned on.
During execution of the gas combustion type heating operation, the operation control unit 5 adjusts the opening degree of the fuel adjustment valve 30 so that the temperature detected by the room temperature sensor 25 becomes the target temperature set by the temperature/time setting switch 46. Then, the combustion control for adjusting the combustion amount of the gas burner 1 is executed.

When the main operation switch 41 is pressed again and an instruction to stop the operation is issued during the execution of the gas combustion heating operation, the operation control unit 5 closes the fuel cutoff valve 29 and the fuel adjustment valve 30 and also the fan. By executing the fire extinguishing process for stopping the drive motor 7m to extinguish the gas burner 1, the gas combustion type heating operation is stopped and the operation lamp 51 is turned off.
Further, the operation control unit 5 operates the forget-to-remove timer with the start of the gas-combustion heating operation, and when the forget-to-remove timer expires, the fire control is executed to stop the gas-combustion heating operation. .. The erasure prevention timer can be set to any of 3 hours, 5 hours, and 8 hours by the temperature/time setting switch 46.
During operation of the gas combustion type heating operation, the operation control unit 5 causes the temperature detected by the ventilation passage temperature sensor 26 to become equal to or higher than a preset overheat prevention set temperature, or the flame sensor 28 turns off the gas burner 1. When is detected, the extinguishing process is executed to stop the gas combustion heating operation.

[Electric heating operation]
When the electric heater operation switch 44 issues an instruction to start the electric heating operation, the operation control unit 5 starts the electric heating operation by operating the fan driving motor 7m and the sheath heater 4 and starts the heater operation. The lamp 54 is turned on.
When the heater output selector switch 45 is repeatedly pressed, the operation control unit 5 responds to a weak heater output as the heater output selector switch 45 is pressed from the state where all the heater output lamps 55 are turned off. The heater output lamp 55 is turned on, the heater output lamp 55 corresponding to a strong heater output is turned on, and the heater output lamps 55 are turned off.

Then, the operation control unit 5 targets the temperature detected by the room temperature sensor 25 by the temperature/time setting switch 46 in a state where all the heater output lamps 55 are turned off during execution of the electric heating operation. Electric heating operation is executed in the temperature adjustment mode by executing heater output control for adjusting the output of the sheath heater 4 so as to reach the temperature.
Further, when the heater output lamp 55 corresponding to the weak or strong heater output is turned on during execution of the electric heating operation, the operation control unit 5 causes the heater output lamp 55 to be turned on. By performing the heater output control for operating the sheath heater 4 with the corresponding heater output, the electric heating operation is performed in the constant output mode.

When the electric heater operation switch 44 is pressed again and a command to stop the electric heating operation is issued while the electric heating operation is being performed in the temperature adjustment mode or the constant output mode, the operation control unit 5 outputs the seed heater 4 and The operation of the fan driving motor 7m is stopped to stop the electric heating operation.
Further, the operation control unit 5 activates the forget-to-remove timer with the start of the electric heating operation, and when the forget-to-remove timer expires, the operation of the sheath heater 4 and the fan drive motor 7m is stopped. , Stop the electric heating operation.
The operation control unit 5 stops the operation of the sheath heater 4 and the fan driving motor 7m when the temperature detected by the ventilation path temperature sensor 26 becomes equal to or higher than the set temperature for preventing overheating during execution of the electric heating operation. , Stop the electric heating operation.

That is, the operation control unit 5 controls the electric heating unit He in a temperature adjustment mode in which the output of the sheath heater 4 is adjusted so that the detected temperature of the room temperature sensor 25 that detects the room temperature becomes the target temperature, or the sheath heater 4 is heated. This means that it can be operated alternatively in the constant output mode in which the heater output is set by the output selector switch 45.
Then, the heater output changeover switch 45 is configured to be able to set the heater output in a plurality of stages (in this embodiment, two stages of strong and weak).

[Hybrid heating operation]
The operation control unit 5 starts the hybrid heating operation when the start of the operation is instructed by the main operation switch 41 while the hybrid switch 47 is turned on and the operation of the hybrid heating is permitted. At this time, the operation control unit 5 operates the fan driving motor 7m, opens the fuel interrupt valve 29 and the fuel regulating valve 30, and executes an ignition process that operates the igniter 31 to perform the gas burner. By burning No. 1, the gas combustion type heating operation for blowing out the warm air generated by the combustion gas of the gas burner 1 into the room is started, and the operation lamp 51 is turned on. In addition, the operation control unit 5 starts the electric heating operation by operating the sheath heater 4 and turns on the heater operation lamp 54.

In the hybrid heating in which the combustion heating unit Hf and the electric heating unit He are used together, the operation control unit 5 measures the room temperature sensor 25 so that the temperature of the air measured by the room temperature sensor 25 reaches a predetermined target temperature. Based on the temperature difference between the temperature of the air and the target temperature, an output determination process for determining the target heating output of the heating means H between the minimum heating output and the maximum heating output is performed, and the target heating output determined in the output determination process. The heating means H is operated so that

In this embodiment, as shown in Table 1 below, the heating output of the heating means H is adjusted to an output at any stage between the first stage (0.52 kW) and the tenth stage (3.64 kW). To be done. Specifically, the operation control unit 5 sets the target heating output of the heating means H to a predetermined value between the minimum heating output (first stage: 0.52 kW) and the maximum heating output (10th stage: 3.64 kW). When the intermediate heating output (7th stage: 2.44 kW) or less, the sheath heater 4 of the electric heating unit He does not operate, and the gas burner 1 of the combustion heating unit Hf has the lowest combustion heating output (0.52 kW). ) And the maximum combustion heating output (2.44 kW), the heating means H is operated in a state where it operates so as to exhibit a predetermined combustion heating output. On the other hand, when the target heating output of the heating means H is larger than the midway heating output (7th stage: 2.44 kW), the operation control unit 5 causes the gas burner 1 of the combustion heating unit Hf to output the maximum combustion heating output. (2.44 kW), and the sheath heater 4 of the electric heating unit He has a predetermined electric heating output (0.40 kW) and a maximum electric heating output (1.20 kW). The heating means H is operated in a state in which it operates so as to produce an electric heating output.

The combustion heating output of the gas burner 1 of the combustion heating unit Hf can be changed by adjusting the supply amount of the fuel gas to the gas burner 1 per unit time. The operation control unit 5 stores the supplied fuel amount corresponding to each combustion heating output, and adjusts the valve opening degree of the fuel adjustment valve 30 to the opening degree corresponding to the supplied fuel amount, so that the gas burner 1 can be operated. The fuel gas supply amount per unit time can be adjusted. The electric heating output of the sheathed heater 4 of the electric heating unit He can be changed by adjusting the amount of electricity supplied to the sheathed heater 4. The operation control unit 5 stores the energization amount corresponding to each electric heating output, and the energization amount to the sheath heater 4 can be adjusted by using a semiconductor element such as a triac. In addition, the operation control unit 5 operates the blower 7 with an output according to the heating output of the heating means H.

FIG. 6 is a flowchart illustrating the operation of the hybrid heating system according to the first embodiment.
When the operation switch is turned on while the hybrid switch 47 is turned on, the operation control unit 5 determines that the operation of the heating means H in the hybrid heating is instructed. Then, in step #10, the operation control unit 5 starts the operation of the heating means H. In this example, in step #10, the operation control unit 5 starts the operation of the heating means H with the target heating output of the heating means H set to the maximum heating output (10th stage: 3.64 kW). That is, the operation control unit 5 operates so that the gas burner 1 of the combustion type heating unit Hf exerts the maximum combustion heating output (2.44 kW), and the sheathed heater 4 of the electric heating unit He has the maximum electric heating. The heating means H is operated in a state in which the heating means H is operated so as to produce the output (1.20 kW). As a result, the temperature of the heating target space quickly rises.

Then, in step #11, the operation control unit 5 determines whether or not the temperature of the air in the heating target space measured by the room temperature sensor 25 has reached the target temperature set by the temperature/time setting switch 46. Then, the operation control unit 5 executes the process #11 again if the temperature of the air in the heating target space has not yet reached the target temperature, and if the temperature of the air in the heating target space has reached the target temperature. If so, the process proceeds to step #12.
As described above, in the present embodiment, the operation control unit 5 sets the target heating output of the heating means H to the maximum heating output (10) immediately after the operation of the heating means H is started until the temperature of the heating target space reaches the target temperature. (Step: 3.64 kW), the heating means H is operated.

In step #12, the operation control means determines whether or not the temperature (room temperature) of the air in the space to be heated is higher than “target temperature+1° C.”. Then, the operation control unit 5 proceeds to step #14 when the temperature of the air in the heating target space (room temperature) is equal to or lower than the “target temperature+1° C.”, and the temperature of the air in the heating target space (room temperature) is the “target temperature”. If the temperature is higher than “temperature+1° C.”, the process proceeds to step #13.

In step #13, the operation control unit 5 performs an output determination process that determines the target heating output of the heating means H. That is, the state in which the temperature of the air in the heating target space (room temperature) is higher than the “target temperature+1° C.” can be regarded as a state in which the heating output of the heating means H is excessive. Therefore, in step #13, the operation control unit 5 adjusts the heating output of the heating means H to decrease. Specifically, the operation control unit 5 operates the heating means H with a heating output that is one step lower than the current heating output of the heating means H as a new target heating output. For example, if the current target heating output of the heating means H is the 10th stage (3.64 kW), then the operation control unit 5 sets the 9th stage (3.24 kW) as the new target heating output as the heating means H. To operate. At this time, the operation control unit 5 sets the combustion heating output of the gas burner 1 of the combustion heating unit Hf to 2.44 kW and the electric heating output of the sheathed heater 4 of the electric heating unit He to 0.80 kW. The heating means H is operated.
As described above, in step #13, the operation control unit 5 performs adjustment to change the heating output of the heating means H to the decreasing side based on the temperature difference between the air temperature measured by the room temperature sensor 25 and the target temperature. Therefore, it can be expected that the room temperature of the heating target space measured by the room temperature sensor 25 approaches the target temperature.

In step #14, the operation control unit 5 determines whether the temperature (room temperature) of the air in the heating target space is lower than the "target temperature-1°C". Then, the operation control unit 5 proceeds to step #16 when the temperature (room temperature) of the air in the heating target space is equal to or higher than the "target temperature-1°C", and the temperature (room temperature) of the air in the heating target space is " When it is lower than the target temperature-1° C., the process proceeds to step #15.

In step #15, the operation control unit 5 performs an output determination process of determining the target heating output of the heating means H. That is, the state in which the temperature (room temperature) of the air in the heating target space is lower than the "target temperature-1°C" can be regarded as a state in which the heating output of the heating means H is too small. Therefore, in step #15, the operation control unit 5 adjusts the heating output of the heating means H to increase. Specifically, the operation control unit 5 operates the heating means H with a heating output that is one step higher than the current heating output of the heating means H as a new target heating output. For example, if the current target heating output of the heating means H is the eighth stage (2.84 kW), then the operation control unit 5 sets the ninth stage (3.24 kW) as the new target heating output as the heating means H. To operate. At this time, the operation control unit 5 sets the combustion heating output of the gas burner 1 of the combustion heating unit Hf to 2.44 kW and the electric heating output of the sheathed heater 4 of the electric heating unit He to 0.80 kW. The heating means H is operated.
In this way, in step #13, the operation control unit 5 performs adjustment to change the heating output of the heating means H to the increasing side based on the temperature difference between the air temperature measured by the room temperature sensor 25 and the target temperature. Therefore, it can be expected that the room temperature of the heating target space measured by the room temperature sensor 25 approaches the target temperature.

Next, in step #16, the operation control unit 5 determines whether the operation switch has been turned off. Then, when the operation switch is turned off, the operation control unit 5 proceeds to step #17 to stop the operation of the heating means H. On the other hand, when the operation switch is not turned off, the operation control unit 5 continues the operation of the heating means H and proceeds to step #12.

As described above, in the hybrid hot air heater of the present embodiment, as shown in Table 1, when the target heating output of the heating means H is set between the minimum heating output and the predetermined midway heating output, the combustion type Since only the heating unit Hf operates, it is possible to suppress an increase in heating cost. On the other hand, when the target heating output of the heating means H is set between the predetermined midway heating output and the maximum heating output, both the combustion heating part Hf and the electric heating part He operate, so that the heating means Sufficient heating output by H can be secured. Further, when increasing the target heating output of the heating means H, the combustion heating output of the combustion type heating unit Hf is preferentially increased until the target heating output reaches the midway heating output, and the target heating output becomes the midway heating output. When it becomes larger, the electric heating output of the electric heating unit He is increased. On the other hand, when reducing the target heating output of the heating means H, the electric heating output of the electric heating unit He is preferentially decreased until the target heating output reaches the midway heating output, and the target heating output is When it becomes less than the midway heating output, the combustion heating output of the combustion type heating unit Hf is decreased. That is, when the target heating output of the heating means H is increased, the combustion heating output of the combustion type heating section Hf is preferentially increased, and when the target heating output of the heating means H is decreased, the electric heating output of the electric heating section He is increased. The combustion heating unit Hf and the electric heating unit He are operated so as to be preferentially reduced. Therefore, it is possible to provide a hybrid hot-air heater that can suppress an increase in heating cost while sufficiently securing the heating output by the heating means H.

<Second Embodiment>
The hybrid hot-air heater of the second embodiment limits the upper limit of the electric heating output of the electric heating unit He to the suppression maximum output (<maximum electric heating output) when the electric heating suppression condition is satisfied. Is different from the above embodiment. The hybrid hot air heater according to the second embodiment will be described below, but the description of the same configuration as the above embodiment will be omitted.

FIG. 7: is a flowchart explaining operation|movement by the hybrid type heating of 2nd Embodiment.
When the operation switch is turned on while the hybrid switch 47 is turned on, the operation control unit 5 determines that the operation of the heating means H in the hybrid heating is instructed. Then, in step #20, the operation control unit 5 performs the first output determination process of determining the target heating output of the heating means H. In the first output determination processing, the operation control unit 5 satisfies the predetermined electric heating suppression condition for suppressing the electric heating output of the electric heating unit He, and the predetermined suppression maximum value less than the maximum electric heating output. The electric heating output of the electric heating unit He is determined with the output as the upper limit.

In the present embodiment, the electric heating suppression condition is that the temperature of the air measured by the room temperature sensor 25 at the start of the operation of the heating means H is equal to or higher than the set temperature. Therefore, when the temperature of the air measured by the room temperature sensor 25 at the start of the operation of the heating means H is equal to or higher than the set temperature (for example, 15° C. or higher) in the first output determination process, the operation control unit 5 suppresses the electric heating. Is determined to have been satisfied. That is, if the temperature of the heating target space is relatively high, the operation control unit 5 limits the upper limit of the electric heating output of the electric heating unit He to the suppression maximum output (<maximum electric heating output). For example, when the maximum electric heating output of the electric heating unit He is 1.20 kW as shown in Table 1, the operation control unit 5 causes the electric heating unit He to operate when the electric heating suppression condition is satisfied. The upper limit of heating output is limited to 0.40 kW, which is the maximum output during suppression. Alternatively, when the electric heating suppression condition is satisfied, the operation control unit 5 limits the upper limit of the electric heating output of the electric heating unit He to the maximum output during suppression of 0 kW and does not operate the electric heating unit He. Alternatively, the heating means H may be operated. In this way, in a high temperature situation where the temperature of the air measured by the room temperature sensor 25 is equal to or higher than the set temperature, the heating output by the heating means H may be insufficient even if the output of the electric heating unit He is small. Therefore, even if it takes a long time to reach the target temperature, the heating cost can be reduced by reducing the output of the electric heating unit He.

Then, in step #22, the operation control unit 5 determines whether or not the temperature of the air in the heating target space measured by the room temperature sensor 25 has reached the target temperature set by the temperature/time setting switch 46. Then, the operation control unit 5 executes the process #22 again if the temperature of the air in the heating target space has not yet reached the target temperature, and if the temperature of the air in the heating target space has reached the target temperature. If so, the process proceeds to step #23.

In step #23, the operation control unit determines whether or not the temperature (room temperature) of the air in the heating target space is higher than “target temperature+1° C.”. Then, the operation control unit 5 proceeds to step #25 when the temperature (room temperature) of the air in the heating target space is equal to or lower than the “target temperature+1° C.” and the temperature (room temperature) of the air in the heating target space is the “target temperature”. If it is higher than "temperature + 1°C", the process proceeds to step #24.

In step #24, the operation control unit 5 performs the second output determination process of determining the target heating output of the heating means H. That is, the state in which the temperature (room temperature) of the air in the heating target space is higher than the “target temperature+1° C.” can be regarded as a state in which the heating output of the heating means H is excessive. Therefore, in step #24, the operation control unit 5 adjusts the heating output of the heating means H to decrease. Specifically, the operation control unit 5 operates the heating means H with a heating output that is one step lower than the current heating output of the heating means H as a new target heating output. Even in the second output determination process, the operation control unit 5 performs the maximum operation when the predetermined electric heating suppression condition for suppressing the electric heating output of the electric heating unit He is satisfied, as in the first output determination process. It is possible to determine the electric heating output of the electric heating unit He with the upper limit of the predetermined maximum output during suppression that is less than the electric heating output.

In step #25, the operation control unit 5 determines whether the temperature (room temperature) of the air in the heating target space is lower than the "target temperature-1°C". Then, the operation control unit 5 proceeds to step #27 when the temperature (room temperature) of the air in the heating target space is equal to or higher than the "target temperature-1°C", and the temperature (room temperature) of the air in the heating target space is " If it is lower than the target temperature −1° C., the process proceeds to step #26 and the second output determination process is performed.

Next, in step #27, the operation control unit 5 determines whether the operation switch has been turned off. Then, when the operation switch is turned off, the operation control unit 5 proceeds to step #28 and stops the operation of the heating means H. On the other hand, when the operation switch is not turned off, the operation control unit 5 continues the operation of the heating means H and proceeds to step #23.

<Third Embodiment>
The hybrid hot air heater according to the third embodiment is different from the second embodiment in the method of determining the heating output of the heating means H. The hybrid hot air heater according to the third embodiment will be described below, but the description of the same configuration as the above embodiment will be omitted.

FIG. 8 is a flowchart illustrating the operation of the hybrid heating system according to the third embodiment.
When the operation switch is turned on while the hybrid switch 47 is turned on, the operation control unit 5 determines that the operation of the heating means H in the hybrid heating is instructed. Then, in step #30, the operation control unit 5 starts the operation of the heating means H. In this example, in step #30, the operation control unit 5 starts the operation of the heating means H with the target heating output of the heating means H set to the maximum heating output (10th stage: 3.64 kW). That is, the operation control unit 5 operates so that the gas burner 1 of the combustion type heating unit Hf exerts the maximum combustion heating output (2.44 kW), and the sheathed heater 4 of the electric heating unit He has the maximum electric heating. The heating means H is operated in a state in which the heating means H is operated so as to produce the output (1.20 kW). As a result, the temperature of the heating target space quickly rises.

Then, in step #31, the operation control unit 5 performs the first output determination process of determining the target heating output of the heating means H. In the first output determination processing, the operation control unit 5 satisfies the predetermined electric heating suppression condition for suppressing the electric heating output of the electric heating unit He, and the predetermined suppression maximum value less than the maximum electric heating output. The electric heating output of the electric heating unit He is determined with the output as the upper limit. Specifically, in step #31, when the temperature of the air measured by the room temperature sensor 25 during the operation of the heating means H is equal to or higher than the set temperature (for example, 15° C. or higher), the operation control unit 5 suppresses the electric heating. Is determined to be satisfied, and the upper limit of the electric heating output of the electric heating unit He is limited to the maximum output during suppression (<maximum electric heating output). For example, as shown in Table 1, when the maximum electric heating output of the electric heating unit He is 1.20 kW, the operation control unit 5 suppresses the upper limit of the electric heating output of the electric heating unit He to 0.40 kW. Limit to maximum output. Alternatively, the operation control unit 5 may operate the heating means H in a state where the electric heating unit He is not operated by limiting the upper limit of the electric heating output of the electric heating unit He to the maximum output during suppression of 0 kW. .. In this way, the temperature of the space to be heated can be quickly raised to at least the set temperature (for example, 15° C.), and thereafter, the temperature of the air measured by the room temperature sensor 25 is higher than the set temperature. In this situation, even if the output of the electric heating unit He is small, the heating output by the heating means H does not become insufficient. Therefore, even if the time to reach the target temperature is delayed, The heating cost can be reduced by reducing the output.

Next, in step #32, the operation control unit 5 determines whether or not the temperature of the air in the heating target space measured by the room temperature sensor 25 has reached the target temperature. Then, the operation control unit 5 executes the process #32 again if the temperature of the air in the heating target space has not reached the target temperature, and if the temperature of the air in the heating target space has reached the target temperature. If so, the process proceeds to step #33.

Since steps #33 to #38 shown in FIG. 8 of the present embodiment are the same as steps #23 to #28 shown in FIG. 7 of the second embodiment, the description thereof will be omitted.

<Fourth Embodiment>
The hybrid hot air heater according to the fourth embodiment is different from the above embodiment in the content of the electric heating suppression condition. The hybrid warm air heater of the fourth embodiment will be described below, but the description of the same configuration as the above embodiment will be omitted.

In the present embodiment, the electric heating suppression condition is that the temperature difference between the air temperature measured by the room temperature sensor 25 and the target temperature at the start of the operation of the heating means H is equal to or less than the set temperature difference. Specifically, in the first output determination process described in the second embodiment, the operation control unit 5 determines that the temperature difference between the air temperature measured by the room temperature sensor 25 at the start of the operation of the heating means H and the target temperature. If it is equal to or less than the set temperature difference (for example, 5° C. or less), it is determined that the electric heating suppression condition is satisfied. That is, if the temperature of the space to be heated is close to the target temperature to some extent, the operation control unit 5 limits the upper limit of the electric heating output of the electric heating unit He to the maximum output during suppression (<maximum electric heating output).

<Fifth Embodiment>
The hybrid hot air heater of the fifth embodiment is different from the above embodiment in the content of the electric heating suppression condition. The hybrid hot air heater of the fifth embodiment will be described below, but the description of the same configuration as the above embodiment will be omitted.

In the present embodiment, the electric heating suppression condition is that the temperature difference between the air temperature measured by the room temperature sensor 25 and the target temperature during the operation of the heating means H is equal to or less than the set temperature difference. Specifically, the operation control unit 5 uses the heating means in the second output determination process described in the second embodiment, and the first output determination process and the second output determination process described in the third embodiment. If the temperature difference between the air temperature measured by the room temperature sensor 25 and the target temperature during the operation of H is equal to or less than the set temperature difference (for example, 5° C. or less), it is determined that the electric heating suppression condition is satisfied. That is, if the temperature of the space to be heated is close to the target temperature to some extent, the operation control unit 5 limits the upper limit of the electric heating output of the electric heating unit He to the maximum output during suppression (<maximum electric heating output).

<Sixth Embodiment>
The hybrid hot air heater according to the sixth embodiment is different from the above embodiment in the content of the electric heating suppression condition. The hybrid hot air heater of the sixth embodiment will be described below, but the description of the same configuration as the above embodiment will be omitted.

In the present embodiment, the eco switch 48 functions as a suppression instruction receiving unit that receives an instruction from the user to suppress the electric heating output of the electric heating unit He. Then, in the output determination process (including the first output determination process and the second output determination process), the operation control unit 5 informs the user that the eco switch 48 has been operated in the ON state and the user heats the heating means H. Considered as an intention to reduce costs. Therefore, when the eco-switch 48 receives an instruction from the user to suppress the electric heating output of the electric heating unit He, the operation control unit 5 determines that the electric heating suppression condition is satisfied, and the operation control unit 5 according to the above-described embodiment. Similarly, the electric heating output of the electric heating unit He is determined with the upper limit of the predetermined maximum output during suppression that is less than the maximum electric heating output.

<Another embodiment>
<1>
In the above embodiment, the configuration of the hybrid warm air heater of the present invention has been described with reference to specific examples, but the configuration can be changed as appropriate.
In the above embodiment, the gas burner 1 that burns the fuel gas is used as the burner of the combustion heating unit Hf, but a burner that uses a liquid fuel such as petroleum as a fuel may be used. In the above embodiment, the sheath heater 4 is described as a specific example of the electric heater, but various heaters such as a nichrome wire heater, a quartz tube heater, a ceramic heater, a carbon heater may be used.
In addition, the installation position of the sheathed heater 4 of the electric heating unit He is not limited to the position described in the above embodiment, and may be, for example, the warm air ventilation passage 11 or the bypass air passage 23.
Further, in the above-described embodiment, an example in which the shared blower 7 that is shared by the combustion type blower 2 and the electric heating blower 3 is provided has been described, but the combustion type blower 2 and the electric heating blower 3 are described. Alternatively, the sheathed heater 4 may be arranged in a ventilation area where the ventilation is performed by the ventilation action of the electric heating blower 3.

<2>
In the above embodiment, the value of the maximum output during suppression may be variably set according to the temperature.
Specifically, the maximum output during suppression may be set to a smaller value as the temperature of the air measured by the room temperature sensor 25 is higher at the start or during the operation of the heating means H. For example, the first preset temperature is 15° C., the second preset temperature is 18° C., and the third preset temperature is 20° C. Then, the operation control unit 5 sets the upper limit of the electric heating output of the electric heating unit He to the maximum electric heating output (1.20 kW) when the room temperature is lower than 15°C (lower than the first set temperature), and the room temperature is 15°C or higher 18 When the temperature is lower than ℃ (first set temperature or higher and lower than the second set temperature), the upper limit of the electric heating output of the electric heating unit He is set to the maximum output during suppression (0.80 kW), and the room temperature is 18 ℃ or higher and lower than 20 ℃ (second setting). When the temperature is equal to or higher than the third set temperature) and the upper limit of the electric heating output of the electric heating unit He is the maximum output during suppression (0.40 kW), and the room temperature is 20° C. or higher (the third set temperature or higher), the electric heating unit He is The upper limit of the electric heating output of 1 may be set to the maximum output during suppression (0 kW). The higher the temperature of the air measured by the room temperature sensor 25, the smaller the heating output required for the heating means H. Therefore, even if the maximum output (maximum output during suppression) of the electric heating unit He is set to a small value, The heating output by the heating means H can be sufficiently secured. As a result, it is possible to obtain a large effect of reducing the heating cost by reducing the output of the electric heating unit He.

Alternatively, the maximum output during suppression may be set to a smaller value as the temperature difference between the room temperature and the target temperature of the space to be heated measured by the room temperature sensor 25 at the time of starting or during the operation of the heating means H is smaller. For example, the first set temperature difference is 7° C., the second set temperature difference is 5° C., and the third set temperature difference is 2° C. Then, the operation control unit 5 sets the upper limit of the electric heating output of the electric heating unit He to the maximum electric heating output (1.20 kW) when the temperature difference between the room temperature and the target temperature is 7°C or higher (first set temperature difference or higher). When the temperature difference between the room temperature and the target temperature is less than 7°C and 5°C or more (less than the first set temperature difference and more than the second set temperature difference), the upper limit of the electric heating output of the electric heating unit He is suppressed and the maximum output (0 .80 kW) and the temperature difference between the room temperature and the target temperature is less than 5° C. and 2° C. or more (less than the second set temperature difference and the third set temperature or more), the upper limit of the electric heating output of the electric heating unit He is suppressed and the maximum output is obtained. (0.40 kW), and if the temperature difference between the room temperature and the target temperature is less than 2° C. (less than the third set temperature difference), the upper limit of the electric heating output of the electric heating unit He may be the maximum output during suppression (0 kW). .. The smaller the temperature difference between the room temperature of the space to be heated measured by the room temperature sensor 25 and the target temperature set by the temperature/time setting switch 46, the smaller the heating output required for the heating means. Even if the maximum output of the section He (maximum output during suppression) is set to a small value, the heating output by the heating means H can be sufficiently secured. As a result, it is possible to obtain a large effect of reducing the heating cost by reducing the output of the electric heating unit He.

<3>
In the embodiment described above, the operation control unit 5 does not operate the electric heating unit He when the target temperature of the heating operation is set to “H (high)” when the operation of the heating means H is started, or You may perform electric heating suppression operation, such as stopping, when it exceeds predetermined time (for example, 30 minutes). When such an electric heating suppression operation is performed, even if the target temperature of the heating operation is set to "H (high)", the operation of the electric heating unit He does not take a long time. This is to prevent the running cost of the heating system from rising.

<4>
The configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises, and are also disclosed in this specification. The embodiments are exemplifications, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be used for a hybrid hot-air heater that can suppress an increase in heating cost while sufficiently securing the heating output by the heating means.

1 gas burner (burner)
2 Blower for combustion heating 3 Blower for electric heating 4 Sheath heater (electric heater)
5 Operation control unit (operation control means)
7 Common blower 25 Room temperature sensor (temperature measuring means)
H Heating means He Electric heating unit Hf Combustion heating unit

Claims (6)

A burner that burns fuel gas; and a combustion-type air blower that takes in air in the heating target space, mixes the taken-in air with the combustion gas of the burner, and blows the mixed gas into the heating target space so that the air blows. A combustion type heating unit, and an electric heating blower that takes in the air of the heating target space and acts to ventilate the taken-in air to the heating target space, and the air ventilated by the electric heating blower. Heating means having an electric heating part having an electric heater for heating
Temperature measuring means for measuring the temperature of the heating target space, and
A hybrid hot-air heater provided with operation control means for controlling operation,
In the hybrid mode in which the combustion heating unit and the electric heating unit are used in combination, the operation control unit measures the temperature of the air measured by the temperature measurement unit so that the temperature of the air reaches a predetermined target temperature. Based on the temperature difference between the temperature of the air to be heated and the target temperature, an output determination process for determining the target heating output of the heating means from between the minimum heating output and the maximum heating output is performed, and the output determination process is performed. Operating the heating means to exert the target heating output,
The operation control means, in the output determination process,
When the target heating output of the heating means is less than or equal to a predetermined midway heating output between the minimum heating output and the maximum heating output, the electric heating unit does not operate, and the combustion heating unit is the lowest. Operating the heating means in a state in which it operates to exert a predetermined combustion heating output between the combustion heating output and the maximum combustion heating output,
When the target heating output of the heating means is larger than the midway heating output, the combustion type heating unit operates so as to exhibit the maximum combustion heating output, and the electric heating unit has a minimum electric heating output and a maximum electric heating output. Operating the heating means in a state in which it operates so as to exhibit a predetermined electric heating output between the electric heating output ,
The operation control means, in the output determination process, when a predetermined electric heating suppression condition for suppressing the electric heating output of the electric heating unit is satisfied, a predetermined suppression maximum less than the maximum electric heating output. Determine the electric heating output of the electric heating unit with the output as the upper limit,
The operation control means, in the output determination process, when the temperature of the air measured by the temperature measuring means at the start or during the operation of the heating means is equal to or higher than a set temperature, the electric heating suppression condition is satisfied. A hybrid hot air heater that determines . The hybrid hot air heater according to claim 1, wherein the higher the suppression output is set to a smaller value as the temperature of the air measured by the temperature measuring means is higher at the time of starting or during the operation of the heating means. The operation control means, in the output determination process, when the temperature difference between the temperature of the air measured by the temperature measuring means and the target temperature at the start or during the operation of the heating means is a set temperature difference or less, The hybrid hot air heater according to claim 1, wherein it is determined that the electric heating suppression condition is satisfied. A burner that burns fuel gas; and a combustion-type air blower that takes in air in the heating target space, mixes the taken-in air with the combustion gas of the burner, and blows the mixed gas into the heating target space so that the air blows. A combustion type heating unit, and an electric heating blower that takes in the air of the heating target space and acts to ventilate the taken-in air to the heating target space, and the air ventilated by the electric heating blower. Heating means having an electric heating part having an electric heater for heating
Temperature measuring means for measuring the temperature of the heating target space, and
A hybrid hot-air heater provided with operation control means for controlling operation,
In the hybrid mode in which the combustion heating unit and the electric heating unit are used in combination, the operation control unit measures the temperature of the air measured by the temperature measurement unit so that the temperature of the air reaches a predetermined target temperature. Based on the temperature difference between the temperature of the air to be heated and the target temperature, an output determination process for determining the target heating output of the heating means from between the minimum heating output and the maximum heating output is performed, and the output determination process is performed. Operating the heating means to exert the target heating output,
The operation control means, in the output determination process,
When the target heating output of the heating means is less than or equal to a predetermined midway heating output between the minimum heating output and the maximum heating output, the electric heating unit does not operate, and the combustion heating unit is the lowest. Operating the heating means in a state in which it operates to exert a predetermined combustion heating output between the combustion heating output and the maximum combustion heating output,
When the target heating output of the heating means is larger than the midway heating output, the combustion type heating unit operates so as to exhibit the maximum combustion heating output, and the electric heating unit has a minimum electric heating output and a maximum electric heating output. Operating the heating means in a state in which it operates so as to exhibit a predetermined electric heating output between the electric heating output,
The operation control means, in the output determination process, when a predetermined electric heating suppression condition for suppressing the electric heating output of the electric heating unit is satisfied, a predetermined suppression maximum less than the maximum electric heating output. Determine the electric heating output of the electric heating unit with the output as the upper limit,
The operation control means, in the output determination process, when the temperature difference between the temperature of the air measured by the temperature measuring means and the target temperature at the start or during the operation of the heating means is a set temperature difference or less, A hybrid hot air heater that determines that the electric heating suppression condition is satisfied. 5. The maximum output during suppression is set to a smaller value as the temperature difference between the temperature of the air measured by the temperature measuring means and the target temperature at the time of starting or during the operation of the heating means is smaller. Hybrid hot air heater described in. A suppression instruction receiving means for receiving an instruction to suppress the electric heating output of the electric heating unit from a user,
In the output determination process, the operation control unit determines that the electric heating suppression condition is satisfied when the suppression instruction receiving unit receives an instruction to suppress the electric heating output of the electric heating unit from the user. The hybrid hot air heater according to any one of claims 1 to 5, which is used for the determination.

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