JP3038330B2 - Hot air blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a hot air blower that burns fuel, warms air with the heat, and blows the hot air.

[0002]

2. Description of the Related Art Conventionally, there are hot air heaters for heating vegetables, fruits, horticultural houses and factories. It burns fuel with a burner and uses this heat to warm the air,
The warm air is blown by a blower, and is distributed to the inside of the house or the like through a vinyl duct connected to the warm air blower to heat the inside of the house or the like.

[0003]

However, in such a conventional apparatus, since the injected fuel is simply ignited and burned, it is difficult to completely burn the fuel, and the thermal efficiency is low. However, there is a problem that fuel consumption increases.

[0004] Therefore, an object of the present invention is to provide a warm air blower which can improve the combustion efficiency of fuel, can also exchange heat well, and can improve the heat efficiency.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a primary heat exchanger having a combustion furnace is provided in a cylindrical wind tunnel having both ends closed. ,
With the nozzle of the burner facing the combustion furnace and burning the fuel injected from the nozzle into the combustion furnace, introducing air into the wind tunnel with a blower and warming the air,
A hot air blower that blows warm air into the room from the outlet of the wind tunnel, and a heat storage plate made of a material having heat resistance and to which fuel easily adheres, in a combustion furnace, receiving fuel injected from a nozzle, and And a secondary heat exchanger into which combustion gas from the primary heat exchanger flows is disposed in the wind tunnel, and is disposed in a position to receive a flame generated by combustion. The hot air blower is configured to heat the introduced air by exchanging heat between the primary and secondary heat exchangers.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the secondary heat exchanger has a plurality of fin pipes having fins formed around the secondary heat exchanger. The helical member is disposed in the fin pipe so that the combustion gas flows in each of the fin pipes along the helical member.

[0007] The invention described in claim 3 is the first or second invention.
In addition to the above configuration, a carbon dioxide introducing means is provided for introducing a predetermined amount of combustion gas into the room in which the room in which the hot air blower is disposed is controlled to a predetermined carbon dioxide concentration.

[0008] The invention according to claim 4 is the invention according to claims 1 to 3.
In addition to the configuration according to any one of the above, while connecting the exhaust stack that discharges the combustion gas to the outside of the secondary heat exchanger,
The burner is connected to an intake cylinder for introducing outside air, the diameter of the intake cylinder and the exhaust cylinder are made different, and a double structure is formed so as to cover the other cylinder outside the one cylinder, These are extended substantially horizontally to the side of the wind tunnel, penetrated through the vertical wall of the chamber to expose the tip side to the outside, and further, the side of the exhaust port of the exhaust pipe is covered with an exhaust cover. It is characterized by.

According to a fifth aspect of the present invention, a primary heat exchanger having a combustion furnace is provided in a cylindrical wind tunnel whose both ends are closed, and a burner nozzle faces the inside of the combustion furnace. While burning the fuel injected from the nozzle into the combustion furnace,
A hot air blower for introducing air into the wind tunnel by a blower, warming the air, and then blowing hot air into the room from an outlet of the wind tunnel, further comprising a support plate having a communication hole in the combustion furnace. A primary combustion chamber that forms the primary combustion chamber, and forms a primary combustion chamber that communicates with the primary combustion chamber through the communication hole, and the combustion furnace forms the primary combustion chamber. Divided into a side cylinder and a secondary combustion chamber side cylinder forming the secondary combustion chamber, the secondary combustion chamber side cylinder is formed of a material having lower heat resistance than the primary combustion chamber side cylinder, Furthermore, a heat storage plate made of a material having heat resistance and to which fuel easily adheres is provided on the support plate at a position in the primary combustion chamber where the fuel injected from the nozzle is received and a flame generated by combustion is received. It is characterized by a hot air blower installed and supported.

According to a sixth aspect of the present invention, a primary heat exchanger having a combustion furnace is provided in a cylindrical wind tunnel having both ends closed, and a burner nozzle faces the combustion furnace. While burning the fuel injected from the nozzle into the combustion furnace,
A hot air blower for introducing air into the wind tunnel by a blower, warming the air, and then blowing hot air into the room from an outlet of the wind tunnel, further comprising a support plate having a communication hole in the combustion furnace. A primary combustion chamber on the burner side, and a secondary combustion chamber communicating with the primary combustion chamber through the communication hole, and a heat storage plate made of a material having heat resistance and easily adhering fuel. In the primary combustion chamber, the fuel injected from the nozzle is received, and at a position where a flame generated by combustion is received, the heat storage plate is disposed so as to be supported by the support plate. It is characterized in that it is a hot air blower formed in a tapered shape so that the wall thickness becomes thinner toward the periphery.

[0011] The invention according to claim 7 is the invention according to claims 1 to 6.
In addition to the configuration according to any one of the above, a discharge port for releasing the explosion pressure generated at the time of ignition from the combustion chamber facing the burner nozzle to the outside is provided in a hot air passage portion other than the combustion chamber. Hot air blower.

[0012]

[0013]

Embodiments of the present invention will be described below.

[First Embodiment of the Invention] FIGS. 1 to 7 show a first embodiment of the present invention.

First, the configuration will be described. In the figure, reference numeral 1 denotes a wind tunnel, which has a substantially rectangular box shape. On the upper part of the wind tunnel 1, first and second blowers 3, 4 are provided in the longitudinal direction. The air is introduced into the wind tunnel 1 by the blowers 3 and 4.

A primary heat exchanger 6 and a secondary heat exchanger 7 are disposed in the wind tunnel 1, and the air introduced from the blowers 3 and 4 into the wind tunnel 1 by the heat exchangers 6 and 7 is provided. Are exchanged with each other, and warm air is blown from the outlet 1a formed in the lower portion of the wind tunnel 1 into the room, here, the greenhouse 9. This outlet 1a has four
An arbitrary outlet 1a can be selected according to the installation condition of the hot air blower in the greenhouse 9, and the like, and a vinyl duct 10 is connected to the selected outlet 1a, and the outlet is provided. The hot air from 1a is blown into the vinyl house 9 through a vinyl duct 10 from an opening (not shown) or an end opening formed in the middle of the vinyl duct 10. The outlet 1a to which the vinyl duct 10 is not connected is closed.

More specifically, the primary heat exchanger 6 has a cylindrical primary heat exchanger main body 11 having both ends closed, and a combustion furnace 12 having a fixed gap in the primary heat exchanger main body 11. It is arranged to have.

The primary heat exchanger body 11 is made of stainless steel and has a number of heat exchange fins 11a formed therearound.

Further, the combustion furnace 12 has a cylindrical combustion furnace body 13 having a communication opening 13a formed at one end and a nozzle opening 13b formed at the other end. The burner 15 is attached to the
Nozzle 15a faces the inside of the combustion furnace main body 13 through the nozzle opening 13b. In this burner 15,
An electrode rod (not shown) for igniting the fuel injected from the nozzle 15a is provided, and the details will be described later.
The outside air is taken in from the outside air inlet 15b and burned.

The inner wall of the combustion furnace main body 13 is formed of a heat-resistant ceramic which is heat-resistant and easily adheres to fuel.

Further, inside the combustion furnace main body 13, that is,
In the combustion chamber 14, a heat storage member 18 is provided at a predetermined position. The heat storage member 18 is formed of a heat-resistant ceramic which is a material having heat resistance and to which fuel easily adheres.
Support plate 19 arranged to separate combustion chamber 14 from side to side
And a heat storage plate 21 supported on the right side in FIG. 1 by a support member 19 via a connecting member 20. The support plate 1
9, a large number of communication holes 19a are formed.
Is disposed at a position to receive the fuel injected from the nozzle 15a and to receive the flame generated by the combustion.

On the other hand, the secondary heat exchanger 7 is provided with a pair of hollow rectangular parallelepiped communication passages 23, 24 on both sides thereof. A plurality of tubular pipes 2 formed with holes
5 are arranged in a zigzag pattern, and a square pipe 2
6 are provided.

In each of the passage pipes 25, a scroll fin 2 as a "spiral member" having a twisted long plate is provided.
5b, an insertion pipe 27 having the same shape as the passage pipe 25 is inserted into the square pipe 26. An outlet 26a is provided on the upper surface of the square pipe 26.
The discharge port 26a is connected to an opening / closing device 32 described later.
It is opened and closed by. The insertion pipe 27 is cut at a position corresponding to the discharge port 26a as shown in FIG.

Then, the one communication passage 23 is connected to an interposition box 28 provided on the primary heat exchanger main body 11 so that the combustion gas from the primary heat exchanger main body 11 is supplied to the secondary heat exchanger 7. Into the communication passage body 23. The exhaust gas that has flowed into the one communication path body 23 is
The gas flows into the other communication passage 24 through the pipes 25 and 27 and is exhausted out of the greenhouse 9 by a structure described later.

On the other hand, a sensor 31 for detecting the concentration of carbon dioxide in the greenhouse 9 in which the hot air blower 100 is disposed is provided, and a predetermined carbon dioxide concentration in the greenhouse 9 is determined based on the value from the sensor 31. An opening / closing device 32 for introducing a predetermined amount of the combustion gas into the greenhouse 9 is provided in order to control the temperature.

As shown in FIG. 5, this opening and closing device 32
A swing arm 32b is rotatably connected to the solenoid 32a about a shaft 32c, and a lever 32d is locked to a lower end of the swing arm 32b. This lever 32d has a shaft 32e
, And a lid 32f is provided integrally with the lever 32d. The lid 32f opens and closes the outlet 26a of the square pipe 26.

A signal from the sensor 31 is input to a control device 34, and the opening and closing device 32 is driven by the signal from the control device 34 to open and close the discharge port 26a of the square pipe 26. A predetermined amount of exhaust gas flows into the greenhouse 9 from the outlet 26a of the square pipe 26.

The discharge port 26a, the opening / closing device 32 and the like constitute "carbon dioxide introducing means".

Further, the communication passage 2 of the secondary heat exchanger 7
An exhaust pipe 39 is connected to the exhaust pipe 4 via an exhaust duct 38, and the exhaust pipe 39 exhausts air from the greenhouse 9 through an exhaust port 39 a of the exhaust pipe 39. The exhaust port 39a is cut obliquely so as to face obliquely downward.

Further, as shown in FIGS. 6 and 7,
An intake cylinder 41 for introducing outside air through a hose 40 is connected to the outside air introduction port 15b of the burner 15, and the intake cylinder 41 is formed to have a diameter larger than that of the exhaust cylinder 39. It has a double structure so as to cover the intake cylinder 41. These are extended substantially horizontally to the side of the wind tunnel 1 and penetrate through the vertical wall 9a of the plastic greenhouse 9 to expose the tip side to the outside.

At the end of the intake cylinder 41, a closing plate 43 is provided.
Is arranged around the exhaust pipe 39, the space between the exhaust pipe 39 and the intake pipe 41 is closed, and a plurality of intake holes 41a are formed around the portion of the intake pipe 41 exposed to the outside from the vertical wall 9a. The outside air is introduced from these intake holes 41a.

Further, an exhaust cover 45 is fixed to the closing plate 43, and the exhaust cover 45 covers the side of the exhaust port 39 a of the exhaust tube 39. The exhaust cover 45 has a circular vertical cross section.
a is opened, and the inclined front end 45b is closed.

The exhaust cylinder 39, the intake cylinder 41, the closing plate 4
3 and the exhaust cover 45 can be formed of heat-resistant plastic, steel, or the like. Also, the exhaust pipe 39
The shape of the intake cylinder 41 and the like can be square.

Next, the operation will be described.

When the power switch is turned on, the indicator lamp of the power turns on and the temperature controller operates. In the burner 15, when the electrode rod is preheated and heated, fuel is injected from the nozzle 15a, and the fuel is ignited by the electrode rod, so that combustion is performed. At this time, outside air is sucked into the inside from the plurality of intake holes 41a of the intake cylinder 41, and the hose 40
And is introduced into the outside air inlet 15b of the burner 15 via the burner 15 and used for combustion. This prevents oxygen in the greenhouse 9 from being consumed by combustion.

Further, since the exhaust cylinder 39 and the intake cylinder 41 have a double structure, and the exhaust gas passes through the exhaust cylinder 39,
When the outside air is taken in, heat exchange is performed using the exhaust heat, so that the taken-in outside air can be brought to the air temperature necessary for combustion of the burner 15, and the combustion efficiency can be improved. .

In this case, the unburned fuel injected at a predetermined angle from the nozzle 15a and not ignited is first adsorbed on the inner wall of the combustion furnace main body 13. The unburned fuel reflected without being adsorbed here and the unburned fuel directly injected are adsorbed on the heat storage plate 21.

Since the heat storage plate 21 is disposed at a position where it receives the flame generated by combustion, it is heated to a high temperature to store heat, and the unburned fuel adsorbed on the heat storage plate 21 as described above. Will be completely burned. Of course, the unburned fuel adsorbed on the inner wall of the combustion furnace main body 13 is also completely stored because the inner wall is heated and stored. This is clear from the test. Therefore, unburned fuel does not flow to the secondary heat exchanger 7 side. In particular, if the heat storage plate 21 is arranged in a high temperature region of the flame, the effect as a heating element is remarkable.

The completely combusted combustion gas flows from the communication opening 13a of the combustion furnace main body 13 into the primary heat exchanger main body 11 around the main body 13 and further from the primary heat exchanger 6 side. Next, it flows into the heat exchanger 7 side.

When the temperature of the primary heat exchanger body 11 rises, the wind tunnel 1 passes through many fins 11a and the like.
The heat exchange is performed with the air introduced therein, and the temperature of the air is increased.

On the secondary heat exchanger 7 side, the communication passage body 2
The combustion gas flows into each pipe 25, 26, 27 from 3
It flows to the other communication path body 24 side. The passage pipe 2
5, the heat of the combustion gas is effectively transmitted to the scroll fins 25b by the spiral flow of the combustion gas inside the scroll fins 25b.
The heat exchange with the air introduced into the wind tunnel 1 is performed through the many fins 25a of the fifth and the like, and the temperature of the air is increased.

As described above, the fuel is completely burned, and the two-stage heat exchange of the primary heat exchanger 6 and the secondary heat exchanger 7 is performed, so that the utilization rate of the heat of the combustion gas is high, and it Can also effectively warm the air. In addition, since the heat exchange efficiency is high, the temperature of the wind tunnel 1 drops to the temperature of the hot air blown from the outlet 1a (50 to 55 ° C.) or less, so that even if the wind tunnel 1 is directly touched, there is no burn The safety of workers working in greenhouses, factories, etc. can be secured.

Further, on the secondary heat exchanger 7 side, a number of passage pipes 25 are provided, and scroll fins 25b are disposed inside, so that the flow rate of the combustion gas is reduced and, at the same time, the combustion gas and the scroll fins 25b are provided. Heat exchange can be effectively performed by increasing the contact area between the heat exchanger and the passage pipe 25.

The air thus warmed (warm air)
Is blown into the greenhouse 9 from the outlet 1a of the wind tunnel 1 through the vinyl duct 10, and the inside of the greenhouse 9 is heated.

On the other hand, the combustion gas that has passed through the secondary heat exchanger 7 passes through the exhaust pipe 39 and is exhausted from the greenhouse 9 through the exhaust port 39a. Since the heat exchange efficiency of the hot air blower 100 is good, the exhaust temperature is 150 ° C.
180 ° C., the exhaust temperature of the conventional product (300 to 400
C)).

In this case, since the exhaust port 39a is covered by the exhaust cover 45, the exhaust port 39a
Since the wind and rain do not blow directly into the inside from the, incomplete combustion can be prevented. If wind pressure acts directly on the exhaust port 39a from the front, incomplete combustion may occur.

When the room temperature in the greenhouse 9 reaches the set temperature, the controller 34 stops the operation of the burner 15 and stops the combustion in the combustion chamber 14. However, if both the blowers 3 and 4 are stopped at the same time as the combustion is stopped, the temperature of the combustion furnace 12 rises due to the residual heat. By doing so, the temperature of the combustion furnace 12 is prevented from rising abnormally.

Thereafter, when the room temperature in the greenhouse 9 becomes lower than the set temperature, the burner 15 automatically operates again to start combustion, and warm air is blown into the room to raise the room temperature.

By repeating this operation, the room temperature in the greenhouse 9 is controlled to the set temperature.

In this way, it is possible to automatically control the optimum growth temperature for each product, and to control the temperature according to each growth stage such as sprouting, germination, flowering, and results.

When the inside of the greenhouse 9 is heated as described above, the sensor 31
This signal is sent to the control device 34, and when the concentration is lower than the desired concentration, the opening / closing device 32 is driven by the signal from the control device 34, and the secondary heat exchanger is The combustion gas is diffused into the greenhouse 9 from the outlet 26a of the square pipe 26 of FIG. As a result, when the carbon dioxide concentration in the greenhouse 9 increases and reaches a predetermined value, the outlet 26a is closed. In addition, the hot air blown out from the outlet 1a of the wind tunnel 1 contains CO
_{Since 2} is mixed, unlike the conventional case where a plurality of CO ₂ generators are used separately from the hot air blower, the CO ₂ concentration unevenness in the greenhouse 9 does not occur. 30 minutes before sunrise, the opening / closing device 3
2 is driven, and a timer and a program are set so that carbon dioxide is radiated from the outlet 26a of the square pipe 26 of the secondary heat exchanger 7 into the greenhouse 9. Will be promoted.

By positively supplying carbon dioxide in this manner, carbonic acid assimilation is activated, and it is possible to improve the quality, increase the yield, and achieve early harvesting. This carbon dioxide has an allowable concentration, and 5000 for workers.
ppm, and about 2000 ppm for crops. If a crop is supplied with carbon dioxide at a level higher than its allowable concentration, there is a possibility that a failure will occur. Therefore, it is necessary to control the carbon dioxide concentration at which early harvesting or the like can be achieved within a range in which no trouble occurs. By the way, the concentration of carbon dioxide in the atmosphere is 3
It is about 00 to 350 ppm.

The control of the carbon dioxide concentration is performed by blowing a predetermined amount of the combustion gas into the greenhouse 9. However, since the combustion gas is completely burned, the inside of the greenhouse 9 is controlled. Unburned gas components such as HC and CO do not enter the air.

Furthermore, according to the present invention, the heating of the greenhouse 9 and the control of the carbon dioxide concentration can be performed by one hot air blower 100. Conventionally, a carbon dioxide generator is installed separately from the hot air heater, which makes installation, piping, wiring work, and maintenance cumbersome, hinders tractor work, reduces the planting area, and requires additional fuel. Moreover, temperature management and the like are complicated. On the other hand, the above-mentioned problem can be solved by adding the function of the carbon dioxide generator as in the hot air blower 100 of the present invention.

The hot air blower of the present invention can be installed not only in the greenhouse 9 but also in a factory or any other place where heating is required, and can be used as a hot air supply source for a dryer or the like. .

In controlling the concentration of carbon dioxide,
Although the sensor 31 is used in the above embodiment, the present invention is not limited to this, and timer control and solar radiation amount proportional control can be performed. In the timer control, the plants absorb carbon dioxide in the greenhouse 9 at the time of sunrise and the carbon dioxide concentration decreases. Therefore, control is performed so that a predetermined amount of combustion gas flows into the greenhouse 9 for a predetermined time after sunrise.
For example, in the case of tomato cultivation, 2 minutes from 30 minutes after sunrise
Set to ~ 3 hours, up to about 4 hours. Further, in the solar radiation amount proportional control, since the amount of carbon dioxide absorbed by the plant changes in accordance with the solar radiation amount, control is performed such that a predetermined amount of combustion gas flows into the greenhouse 9 according to the solar radiation amount. . For example, in the case of cucumber cultivation, on a sunny day, 1
000 to 1500 ppm, and 500 to 1 on rainy days
It is controlled to be 000 ppm.

Further, even if the size of the greenhouse 9 to be heated or the size of the factory changes, the change in the heating capacity can be dealt with by replacing the nozzle 15a for determining the fuel injection amount of the burner 15.

[Second Embodiment of the Invention] FIGS. 8 to 10 show a second embodiment of the present invention.

In the second embodiment, the combustion furnace main body 53 is divided into a primary combustion chamber side cylinder 54 and a secondary combustion chamber side cylinder 55, and a support plate is provided at a connection portion between these two cylinders 54, 55. 19
Is provided, the primary combustion chamber 56 and the secondary combustion chamber 57 on the burner 15 side are formed.

The primary combustion chamber side cylinder 54 is formed of ceramic having high heat resistance, and the secondary combustion chamber side cylinder 55 is formed of stainless steel having lower heat resistance than the primary combustion chamber side cylinder 54. ing.

The tip 5 of the primary combustion chamber side cylinder 54
The support plate 19 is fitted and disposed inside the inner side of the secondary combustion chamber side cylinder 55 at the rear end 55a.
And the fitting portion is supported by a plurality of support bolts 58 arranged around the periphery. A substantially L-shaped support angle 59 is provided at the lower end of the distal end of the secondary combustion chamber side cylinder 55.
The support bolt 60 is disposed at the support angle 59, and the distal end side of the combustion furnace main body 53 is supported.

The primary combustion chamber side cylinder 54 has a nozzle opening 54b, while the secondary combustion chamber side cylinder 55 has a communication opening 55b.

A diffuser 62 is arranged in the nozzle opening 54b in front of the burner nozzle 15a. As shown in FIG. 10, the diffuser 62 has a disk shape, has a circular central opening 62c formed in the center, and a plurality of slits 62a are formed around the central opening 62c in the radial direction. A guide blade 62b is formed by cutting and raising the periphery of the slit 62a.
The guide vanes 62b are configured so that air passing through the slits 62a swirls, while the central opening 62c
The fuel from the burner nozzle 15a is injected into the primary combustion chamber 56 via the air, and the air is also injected together.

On the other hand, a heat storage plate 64 is supported on the support plate 19. The heat storage plate 64 is formed of ceramic, and as shown in FIG.
The heat storage plate 64 is formed in a circular shape when viewed from the fifth side, the back surface portion 64b is formed in a tapered shape, and the heat storage plate 64 is formed so as to become thinner toward the peripheral portion. And this heat storage plate 6
4 is located at the center line O of the communication hole 19a of the support plate 19.
It is configured to have a positional relationship substantially coinciding with 1. The heat storage plate 64 has a shaft portion 64d at the center on the back surface portion 64b side.
The shaft portion 64d is fitted into a fitting hole 19b formed at the center of the support plate 19, and a stainless steel ring-shaped portion is formed on the tip end side of the shaft portion 64b protruding from the support plate 19. Of the stainless steel pin 6 is fitted to the balance weight 65 and the shaft portion 64d.
6 is inserted. Thus, the heat storage plate 64 is supported by the support plate 19 and disposed.

In such a case, the burner 15
The outside air sent into the combustion furnace main body 53 through the diffuser 6
After passing through the second slit 62a, a spiral flow is generated by the guide vanes 62b, and is sent while being rotated in the combustion furnace main body 53. As a result, the residence time of the combustion gas becomes longer and the contact time with the oxygen becomes longer, so that complete combustion takes place.

In the state before ignition, the primary combustion chamber 56
The internal pressure is the same as the external pressure (atmospheric pressure), but the temperature inside the primary combustion chamber 56 rises due to the ignition, and the air starts flowing toward the secondary combustion chamber 57.
The flow speed is further increased, and the pressure inside the primary combustion chamber 56 becomes a negative pressure. The length of the flame is short at atmospheric pressure and long at negative pressure. Therefore, the length of the flame of the vortex flow in the primary combustion chamber 56 can be lengthened, the hottest part of the tip of the flame hits the heat storage plate 64, and the combustion gas stays at a slow speed. By burning while making
It can be burned at a low pressure.

Since the back surface 64b of the heat storage plate 64 is formed in a tapered shape, the front surface 64a of the heat storage plate 64 is formed.
The combustion gas that has flowed from the side to the back portion 64b side can be satisfactorily passed through the communication hole 19a of the support plate 19,
The flow can be improved.

Further, the temperature in the primary combustion chamber 56 is 110
Although it is about 0 ° C., the temperature in the secondary combustion chamber 57 is 900 ° C.
And the temperature inside the secondary combustion chamber 57 is lower, the combustion furnace main body 53 is divided into a primary combustion chamber side cylinder 54 and a secondary combustion chamber side cylinder 55, By forming the cylinder 55 from a material having lower heat resistance than the primary combustion chamber side cylinder 54, it is more advantageous in terms of cost than when the entire body is formed from a material having high heat resistance. Further, by dividing the combustion furnace main body 53 into the primary combustion chamber side cylinder 54 and the secondary combustion chamber side cylinder 55, the support plate 19 and the heat storage plate 64 can be easily disposed inside. .

In addition, since the heat storage plate 64 becomes extremely hot, the method of supporting the heat storage plate 64 becomes problematic. As described above, the shaft portion 64d is fitted to the support plate 19, and
By fitting d to the balance weight 65, the heat storage plate 64 can be supported with a structure that is strong against heat. Although the balance weight 65 is made of stainless steel, the balance weight 65 is located on the side of the secondary combustion chamber 57 and has a lower temperature than that of the primary combustion chamber 56, so that sufficient durability due to heat can be secured.

The other configuration and operation are the same as those of the first embodiment, and the description will not be repeated.

[Third Embodiment of the Invention] FIGS. 11 and 12
Shows a third embodiment of the present invention.

In the third embodiment, the explosion pressure generated at the time of ignition is released from the primary combustion chamber 56 (combustion chamber facing the burner nozzle 15a) to the outside, and CO ₂ is discharged from the outlet 1a of the wind tunnel 1 into the greenhouse 9. A configuration to introduce is provided.

That is, the square pipe 2 of the secondary heat exchanger 7
6, that is, a discharge port 26a is provided in the hot air passage portion other than the primary combustion chamber 56 in the same manner as in the first embodiment, and the explosion pressure generated at the time of ignition is released from the discharge port 26a, and the amount of CO ₂ Is controlled and introduced into the greenhouse 9.

More specifically, the lid 6 for opening and closing the discharge port 26a
9 is fixed to the connecting plate 70, and the connecting plate 7
0 is the lower part 71a of the slide shaft 71 and the rack 7
The two lower ends 72a are fixed. Then, the slide shaft 71 is inserted into a slide bush 74 fixed to the base plate 73 so as to be slid vertically. The rack 72 is inserted into the driving unit 75 and meshes with a pinion provided in the driving unit 75, and the rack 72 is moved up and down by being rotated by a motor in the driving unit 75. Has become. This motor is controlled as described later. Further, an upper limit switch 76 and a lower limit switch 7 for detecting the upper and lower limits of the rack 72 are provided.
7 are provided.

When the burner 15 is ignited, the motor of the drive unit 75 is controlled to raise the rack 72, thereby raising the lid 69 and opening the outlet 26a of the square pipe 26. As a result, the explosion pressure generated at the time of ignition of the burner 15 can be released from the discharge port 26a, and a rapid pressure increase in the primary combustion chamber 56 can be suppressed, and ignitability can be secured.

When the outlet 26a is open, the CO ₂ in the square pipe 26 is discharged to the outside of the secondary heat exchanger 7 in the wind tunnel 1, and this is discharged from the outlet 1a of the wind tunnel 1.
From the greenhouse 9. Therefore, by controlling the opening and closing of the outlet 26a, the amount of CO ₂ in the greenhouse 9 can be adjusted.

Other structures and operations are the same as those of the second embodiment.

As a modification of the third embodiment, there is one shown in FIG. 13 or FIG. FIG.
A lid 79 for opening and closing the discharge port 26a of the square pipe 26 is rotatably provided by a hinge 80, and the lid 79 is provided with the weight of the discharge port 26a of the square pipe 26 by its own weight.
It is configured to close. Then, when the pressure in the square pipe 26 increases at the time of ignition, the lid 79 is opened by the pressure as shown by the two-dot chain line in the figure, and the explosion pressure generated at the time of ignition can be released. In FIG. 14, the outlet 26a of the square pipe 26 is always open, so that the explosion pressure generated at the time of ignition can be released. The outlet for releasing the explosion pressure generated at the time of ignition can be formed in a portion other than the square pipe 26 as long as it is a portion other than the primary combustion chamber 56 (combustion chamber facing the burner nozzle 15a).

[0079]

As described above, according to the first aspect of the present invention, a heat storage plate made of a material having heat resistance and to which fuel easily adheres is supplied to a fuel storage plate injected from a nozzle in a combustion furnace. The fuel can be completely burned by arranging the secondary heat exchanger at the position where it receives the flame generated by combustion, and the heat exchange can be performed effectively by arranging the secondary heat exchanger. Since the thermal efficiency can be improved, the fuel consumption can be reduced.

According to the second aspect of the present invention, in addition to the above-mentioned effects, the secondary heat exchanger has a plurality of fin pipes having fins formed around the fin pipes, and each of the fin pipes has a spiral shape. Since the members are arranged so that the combustion gas flows along the spiral member, the area of the combustion gas in contact with the fin pipe and the spiral member can be increased, and the heat exchange property can be improved.

According to the third aspect of the present invention, in addition to the above-described effects, a predetermined amount of combustion gas is introduced into the room in which the hot air blower is installed to control the concentration of carbon dioxide in the room. Since the introduction means was provided, it is possible to perform heating and carbon dioxide concentration control with one hot air blower without the need to separately provide a device for controlling carbon dioxide concentration,
In addition to being economical, since a predetermined amount of completely burned combustion gas is introduced into the room, unburned gas does not flow into the room.

According to the fourth aspect of the present invention, in addition to the above effects, an exhaust pipe for discharging combustion gas to the outside of the room is connected to the secondary heat exchanger, and an intake for introducing outside air to the burner. Cylinders are connected, the diameter of the intake cylinder and the diameter of the exhaust cylinder are made different from each other, and the other cylinder is placed outside the one cylinder to form a double structure. Since it extends horizontally and penetrates the vertical wall of the chamber to expose the tip side to the outside, and furthermore, the side of the exhaust port of the exhaust pipe is covered with an exhaust cover, it is compared with a conventional chimney extending upward. Then, the structure can be made extremely simple, such as shortening the length of the pipe, and if the exhaust pipe is extended to the side, it is easily affected by wind.However, by covering the side of the exhaust port with the exhaust cover, wind and rain Incomplete combustion can be prevented without directly acting on the exhaust port.

According to the fifth aspect of the present invention, the combustion efficiency can be improved, and the primary combustion chamber side cylinder forming the primary combustion chamber and the secondary combustion chamber side cylinder forming the secondary combustion chamber can be improved. Since the secondary combustion chamber-side cylinder is formed of a material having lower heat resistance than the primary combustion chamber-side cylinder, it can be more cost-effective than forming the entire body with a material having high heat resistance. By dividing the cylinder into the primary combustion chamber side cylinder and the secondary combustion chamber side cylinder, it is possible to easily dispose the support plate and the heat storage plate inside.

According to the sixth aspect of the present invention, the combustion efficiency can be improved, and the rear surface of the heat storage plate is formed in a tapered shape, so that the heat storage plate is moved from the front to the rear. The circulated combustion gas can be satisfactorily passed through the communication hole of the support plate, and the flow can be improved.

According to the seventh aspect of the present invention, the discharge port for releasing the explosion pressure generated at the time of ignition from the combustion chamber facing the burner nozzle to the outside is provided in the warm air passage other than the combustion chamber. Abrupt pressure rise in the chamber can be suppressed,
The ignitability can be secured.

[0086]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a warm air blower according to Embodiment 1 of the present invention.

FIG. 2 is an exploded perspective view of the warm air blower according to Embodiment 1.

FIG. 3 is an exploded perspective view showing the secondary heat exchanger according to the first embodiment.

FIG. 4 is a perspective view showing a square pipe and the like according to the first embodiment.

FIG. 5 is a diagram showing an opening and closing device for opening and closing the outlet of the square pipe according to the first embodiment.

FIG. 6 is a diagram showing an intake / exhaust structure of the warm air blower according to Embodiment 1.

FIG. 7 is a perspective view showing an exhaust cylinder, an intake cylinder, and the like according to the first embodiment.

FIG. 8 is a sectional view of a hot air blower according to Embodiment 2 of the present invention.

FIG. 9 is an exploded perspective view of a support plate, a heat storage plate, and the like according to the second embodiment.

FIG. 10 is a perspective view showing a diffuser according to the second embodiment.

FIG. 11 is a cross-sectional view corresponding to FIG. 5 according to Embodiment 3 of the present invention.

FIG. 12 is a sectional view taken along line AA of FIG. 11 according to the third embodiment.

FIG. 13 is a cross-sectional view of an outlet portion of a square pipe showing a modification of the third embodiment.

FIG. 14 is a cross-sectional view of an outlet portion of a square pipe showing another modification of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wind tunnel 1a opening 3 First blower 4 Second blower 6 Primary heat exchanger 7 Secondary heat exchanger 9 Greenhouse 12 Combustion furnace 14 Combustion chamber 15 Burner 15a Nozzle 21 Heat storage plate 25 Passage pipe 25a Fin 25b Scroll fin (spiral type) Parts) 31 Sensor 32 Switchgear (carbon dioxide introduction means) 39 Exhaust cylinder 39a Exhaust port 41 Intake cylinder 45 Exhaust cover 53 Combustion furnace body 54 Primary combustion chamber side cylinder 55 Secondary combustion chamber side cylinder 56 Primary combustion chamber 57 Two Next combustion chamber 62 Diffuser 64 Heat storage plate 64b Back side 65 Balance weight 100 Hot air blower

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24H 3/06 301-304 F23D 11/24 F24H 7/02

Claims (7)

(57) [Claims] 1. A primary heat exchanger having a combustion furnace is disposed in a cylindrical wind tunnel whose both ends are closed, and a burner nozzle faces the combustion furnace, and is injected from the nozzle into the combustion furnace. A hot air blower that burns the supplied fuel, introduces air into the wind tunnel by a blower, warms the air, and then blows warm air into the room from the outlet of the wind tunnel, and has heat resistance. A heat storage plate made of a material to which fuel easily adheres is disposed in the combustion furnace at a position for receiving the fuel injected from the nozzle and receiving the flame generated by the combustion, and the combustion gas from the primary heat exchanger. Is disposed in the wind tunnel, and the air introduced into the wind tunnel by the blower is heat-exchanged between the primary and secondary heat exchangers to warm the air. Hot air blower characterized by doing. 2. The secondary heat exchanger has a plurality of fin pipes around which fins are formed, and a spiral member is disposed in each of the fin pipes, and the inside of each of the fin pipes is formed. The hot air blower according to claim 1, wherein the combustion gas is set to flow along the spiral member. 3. A carbon dioxide introducing means for introducing a predetermined amount of combustion gas into said room for controlling a concentration of carbon dioxide in the room in which the warm air blower is disposed, wherein said carbon dioxide introducing means is provided. 2. The hot air blower according to 2. 4. An exhaust pipe for discharging combustion gas to the outside of the room is connected to the secondary heat exchanger, and an intake pipe for introducing outside air is connected to the burner. By making the diameter different, a double structure is formed so as to cover the other cylinder on the outside of the one cylinder, and extend substantially horizontally to the side of the wind tunnel and penetrate the vertical wall of the chamber. The warm air blower according to any one of claims 1 to 3, wherein a tip end side is exposed to the outside, and a side of an exhaust port of the exhaust pipe is covered with an exhaust cover. 5. A primary heat exchanger having a combustion furnace is disposed in a cylindrical wind tunnel whose both ends are closed, and a burner nozzle faces the combustion furnace, and is injected from the nozzle into the combustion furnace. A hot air blower that burns the supplied fuel, introduces air into the wind tunnel by a blower, warms the air, and then blows warm air into the room from the outlet of the wind tunnel, A support plate having a communication hole is provided to form a primary combustion chamber on the burner side, and a secondary combustion chamber communicating with the primary combustion chamber via the communication hole. It is divided into a primary combustion chamber side cylinder forming a combustion chamber and a secondary combustion chamber side cylinder forming the secondary combustion chamber, and the secondary combustion chamber side cylinder is more heat resistant than the primary combustion chamber side cylinder. A heat storage plate made of a material with low heat resistance and made of a material that has heat resistance and easily adheres to fuel A hot air blower, which is supported by the support plate and disposed in the primary combustion chamber at a position for receiving the fuel injected from the nozzle and receiving the flame generated by the combustion. 6. A primary heat exchanger having a combustion furnace is provided in a cylindrical wind tunnel whose both ends are closed, and a burner nozzle faces the combustion furnace, and is injected from the nozzle into the combustion furnace. A hot air blower that burns the supplied fuel, introduces air into the wind tunnel by a blower, warms the air, and then blows warm air into the room from the outlet of the wind tunnel, A support plate having a communication hole is provided to form a primary combustion chamber on the burner side and a secondary combustion chamber communicating with the primary combustion chamber via the communication hole. A heat storage plate of a material that easily adheres is provided in the primary combustion chamber at a position receiving the fuel injected from the nozzle and receiving a flame generated by the combustion, supported by the support plate, and further disposed. The heat storage plate has a rear surface portion formed in a tapered shape, and a peripheral edge portion. A warm air blower characterized in that the wall thickness is reduced as going toward. 7. An exhaust port for releasing an explosion pressure generated at the time of ignition from a combustion chamber facing the burner nozzle to the outside is provided in a hot air passage portion other than the combustion chamber. The warm air blower according to any one of the above.