JP2002168527A - Hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction of a hot air heater which can early detect the presence of an obstacle in the front surface of a hot air outlet port to stop the operation of a device and prevent the damage of parts. SOLUTION: A hot air heater comprises a burner 1 for burning gas, an air supply passage 11 for hot air obtained by mixing combustion gas generated upon burning the gas with externally taken air, a convection fan 4 for feeding the hot air and a hot air outlet port 5 for blowing off the hot air. A duct 13 having one end opened 13b to the air supply passage near the convection fan 4 and the other end 13a opened to and facing the hot air outlet port side is provided and an air volume detector 19 is provided in the duct. When the output value of the air volume detector reaches a first prescribed value, a control part 20 decides that the obstacle 16 exists in the front side of the device to display the presence of the obstacle in the operating part of the device and to stop the operation of the device in accordance with a second prescribed value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of a warm air heating device for warming and sending indoor air.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional warm air heater. The burner 1 as a heater burns the supplied gas.
The combustion chamber 2 contains the exhaust gas 1 generated by the combustion of the burner 1.
Mix 0 and air. The convection fan 4 is provided below the burner 1, mixes the taken air with the warm air from the combustion chamber 2 to lower the temperature, and sends out the warm air 3 from the warm air outlet 5 through the ventilation passage 11. The case 6 of the appliance has an air inlet 8 with a filter 8a for taking in convection air 7 in the room on the rear surface, and the warm air outlet 5 is positioned below the front surface.

[0003] A temperature detector 9 is provided at a position just above the combustion chamber 2 on the wall forming the air passage 11, and detects an abnormal temperature of the combustion chamber 2. The control unit 12 is provided in the case 6 at a position on the front side of the case 6 above the hot air outlet 5 that is hardly affected by the temperature away from the combustion chamber 2.
The convection fan 4 is controlled to perform normal heating operation control, and a signal from the temperature detector 9 that detects an abnormal rise in temperature in the combustion chamber 2 is input to stop the combustion of the burner 1 (operation stop of the appliance). )).

Next, the operation will be described. High-temperature combustion exhaust gas 10 generated by burning gas with burner 1
Then, convection air 7 taken in from the air suction port 8 by the convection fan 4 is mixed in the ventilation passage 11. The warm air for heating whose temperature has been reduced by mixing is sent out from the hot air outlet 5 as the warm air 3 by the convection fan 4 and is heated to heat the room.

[0005] The filter 8 of the air suction port 8
When the temperature of the combustion chamber 2 rises abnormally, or there is an obstacle in front of the hot air outlet 5, and the hot air outlet 5 When the case 6 is heated by the hot air blown out and bounced back by the hot air blown out of the case, and the temperature of the combustion chamber 2 rises abnormally, the control unit 12 uses the signal from the temperature detector 9 that detects this temperature abnormality to cause the control unit 12 to operate the appliance. The operation was stopped.

[0006]

However, when there is an obstacle in front of the hot air outlet 5 of the case 6, the hot air hits the obstacle and causes a short circuit, so that the case 6 is exposed to a high temperature and the temperature gradually increases. By the time the temperature rises and the temperature detector 9 detects an abnormality, the warm air may reduce the deformation of the exterior resin parts and the durability of the main parts including the control unit 12, and the obstacle itself may be relatively long. There are problems such as exposure to high-temperature hot air.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a heater, and a ventilation passage for guiding hot air in which hot air generated by the heater and air taken in from the outside are mixed. A convection fan that sends out hot air, a hot air outlet that blows out hot air, and one end opened to the air passage near the convection fan, and the other end is opened facing the hot air outlet side. It is determined that there is an obstacle in front of the appliance based on the duct into which the hot air that has bounced back and flows, the air flow detector that is installed in the duct and detects the bounced hot air, and the output value of the air flow detector. And a control unit for stopping the operation of the appliance.

By this means, it is possible to detect the presence of an obstacle in front of the hot air outlet and to stop the operation of the appliance quickly, thereby protecting the appliance and the obstacle from being exposed to the warm air.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is directed to a heater, an air passage for guiding hot air in which hot air generated by the heater and air taken in from the outside are mixed, and a convection fan for sending hot air. A hot air outlet that blows out hot air and one end is opened in the air passage near the convection fan, and the other end is opened facing the hot air outlet side, and hot air that bounces off an obstacle flows in. Control to determine that there is an obstacle in front of the appliance based on the output value of the air volume detector installed in the duct and detect the inflowing hot air, and the output value of the air volume detector, and to stop the operation of the appliance. The airflow detector directly detects that hot air that has bounced off an obstacle has flowed into the opening at one end from the opening at the other end of the duct, and the control unit has Has the effect of stopping the operation of the appliance more quickly than the technology of That.

According to a second aspect of the present invention, there is provided a convection fan for feeding a warm air, a heater, a blowing passage for guiding the warm air in which the warm air generated by the heater and the air taken in from the outside are mixed. And a hot air outlet that blows out hot air, and one end of which is opened in an air passage near the convection fan, and the other end is opened facing the side of the hot air outlet and bounces back against an obstacle. An inflow duct, an air flow detector installed in the duct and detecting the incoming hot air, and an output value of the air flow detector increases, and when an output value of the air flow detector reaches a first predetermined value, an obstacle is positioned in front of the outlet. And a controller for stopping the operation of the heater after a lapse of a predetermined time from the first predetermined value or at a second predetermined value of the air flow detector, and The warm air that bounces off the object is one end from the opening at the other end of the duct. The airflow detector directly detects the inflow toward the mouth, and the control unit stops the operation of the appliance more quickly than the conventional technology. Can be operated without stopping the operation of the appliance.

According to a third aspect of the present invention, the control unit is configured to detect an abnormality based on a degree of an output change amount of the air volume detector in order to detect an obstacle in front of the outlet at an early stage. Thus, the control unit has a function of quickly detecting an obstacle in front of the outlet based on the gradient of the output change amount of the air volume detector and causing the control unit to quickly stop the operation of the appliance.

According to a fourth aspect of the present invention, the duct has one end opened to a ventilation passage near the convection fan so that a negative pressure is generated by the flow of the warm air, and the other end rebounds against an obstacle. Facing the hot air outlet to allow hot air to flow in, the hot air that has bounced off an obstacle is forced to flow into the duct and obstructs in front of the hot air outlet. It has the effect of quickly detecting an object.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a side sectional view of a gas hot air heating apparatus according to Embodiment 1, FIG. 2 is a cross sectional view of a duct portion of the gas hot air heating apparatus, and FIG. It is a cross-sectional view of the duct portion when an obstacle of the hot air heating device occurs,
FIG. 4 is an operation diagram of a control unit of the gas hot air heating device, and FIG. 5 is a characteristic diagram of an air volume detector of the gas hot air heating device. In the first embodiment, the same components and operations as those of the related art shown in FIG.
The different parts will be mainly described.

The duct 13 is provided in the case 6 on both sides of the hot air outlet 5 and is provided in the air passage 11 near the convection fan 4 so that a negative pressure is generated by the hot air flowing through the air passage 11 by the convection fan 4. One end is opened 13b, and the other end is opened in the vicinity of the hot air outlet 5 facing the hot air outlet so that the hot air 3 which has blown out from the hot air outlet 5 and hits the obstacle 16 and rebounds flows in. 13a.

The duct guide plate 17 is adapted to prevent hot air from entering the opening 13b at one end of the duct 13 and to prevent the opening 13b from generating an ejector action (negative pressure action) at the flow rate of the hot air 3 at the opening 13b. It is provided so as to be inclined downward from. The partition plate 18 is provided at the opening 1 at the other end of the duct 13.
3a is provided between the hot air outlet 5 and the hot air blown out from the hot air outlet 5 in a normal hot air heating, and a short circuit is applied to the opening 13a at the other end of the duct 13.
So that it does not flow in large quantities from Therefore, in normal warm air heating, the duct 13 always flows through the opening 13a.
And a small amount of warm air 3 flowing out of the opening 13 b at one end flows through the duct 13.

The air flow detector 19 is provided facing the inside of the duct 13, detects a pressure change due to the amount of hot air flowing through the duct 13, and outputs a signal to the control unit 20. The control unit 20 is configured by a microcomputer or the like, and controls the obstacle 1
6, the air volume detector 19 detects a pressure change due to the hot air 3 which has bounced back and flows into the opening 13b at one end from the opening 13a at the other end of the duct 13, and as shown in FIG. The first predetermined value output from the air volume detector 19 is input to the appliance operation unit (not shown).
Is determined and displayed, and further, the output of the second predetermined value generated by the air volume detector 19 is input to control to extinguish the combustion of the burner 1 and stop the heating operation.

In the above embodiment, as shown in FIGS. 1 and 2, gas is burned by the burner 1 and the generated high-temperature combustion exhaust gas 10 and the convection air 7 taken in from the air suction port 8 by the convection fan 4 are blown. Mixed in passage 11,
Then, the warm air for heating whose temperature has decreased is sent out from the warm air outlet 5 as the warm air 3 by the convection fan 4 and is sent out to perform normal heating operation for heating the room. In this normal heating operation, a small amount of warm air 3 flows into the duct 13 through the opening 13a at the other end, passes through the duct 13 and flows out from the opening 13b at the one end.
Does not reach the first predetermined value.
Controls the normal heating operation.

The filter 8a of the air suction port 8
If the temperature of the combustion chamber 2 rises abnormally due to the difficulty in introducing air from the air suction port 8 due to excessive dust clogging, the control unit 20 receives a signal from the temperature detector 9 that detects this temperature abnormality.
Extinguishes the combustion of the burner 1 and stops the operation of the appliance.

Particularly, in this embodiment, when the case 6 is installed in a place where the obstacle 16 is located in front of the hot air outlet 5, the hot air 3 hits the obstacle 16 as shown in FIG. A large amount of warm air bounces toward the wind outlet 5. The bounced hot air 3 is sucked from the opening 13 a at the other end of the duct 13 by the rebound force and the ejector action of the duct 13, flows through the duct 13, and flows from the opening 13 b at one end to the ventilation passage 11. Then, the air volume detector 19 detects a pressure change due to a large amount of the hot air 3 passing through the duct 13 and outputs the same to the control unit 20. As shown in FIGS. 4 and 5, when the output of the air volume detector 19 in step (hereinafter referred to as S) 1 reaches a first predetermined value in S2, the control unit 20 determines in S3 that there is an obstacle. And display it. Further, when the output of the air volume detector 19 increases to reach the second predetermined value in S4, S
At 5, the combustion of the burner 1 is extinguished and the heating operation of the appliance is stopped.

Therefore, the air volume detector 19 directly detects that the hot air 3 bounced off the obstacle 16 flows from the opening 13a at the other end of the duct 13 into the opening 13b at one end. Obstacles can be detected quickly.

The control unit 20 inputs the output of the air volume detector 19 separately into a first predetermined value and a second predetermined value larger than the first predetermined value. The presence of the object in front of the outlet 5 is displayed, the operation of the appliance is stopped at the second predetermined value, and the detection of obstacles and the operation stop of the appliance in front of the hot air outlet 5 are performed according to the related art. This can be done quickly and protects the heating appliances from exposure to hot warm air.

Although the above embodiment has been described by taking a gas hot air heating device as an example, the present embodiment is also applicable to a hot air heating device using electricity as a heat source.

(Embodiment 2) FIG. 6 is an operation diagram of a control section of a gas hot air heating apparatus according to Embodiment 2 of the present invention, and FIG. 7 is a characteristic diagram of an air flow detector of the gas hot air heating apparatus. The invention of the second embodiment is characterized in that the control unit is configured to detect an abnormality based on the degree of the output change amount of the air volume detector in order to early detect the presence of an obstacle in front of the outlet. Portions which differ from the invention of Example 1 but exhibit the same configuration and operation and effect are denoted by the same reference numerals, detailed description thereof will be omitted, and different points will be mainly described with reference to FIGS. 1 to 3, 6 and 7. It will be described according to the following.

The control unit 20a detects an abnormality based on the output change per unit time of the air volume detector 19 as shown in FIG. 6 in order to detect the obstacle 16 in front of the outlet 5 at an early stage. It is composed.

In the above embodiment, the normal heating operation is performed in the same manner as described in the first embodiment.

In particular, in this embodiment, when the case 6 is installed at a place where the obstacle 16 is located in front of the hot air outlet 5, the hot air 3 hits the obstacle 16 as shown in FIG. A large amount of warm air bounces toward the wind outlet 5. The bounced hot air 3 is sucked from the opening 13 a at the other end of the duct 13 by the rebound force and the ejector action of the duct 13, flows through the duct 13, and flows from the opening 13 b at one end to the ventilation passage 11. Then, the air volume detector 19 detects a pressure change due to a large amount of the hot air 3 passing through the duct 13 and outputs the same to the control unit 20a. As shown in FIG.
0a determines whether or not the output of the air volume detector 19 in S1 is S2 and there is a change in the T1 value in T seconds. If there is such a change, it is determined that there is an obstacle and the burner 1 is burned in S3. Extinguish the fire and stop heating operation of the appliance.

Therefore, the control unit 20a stops the operation of the hot-air heating appliance when the air flow detector 19 detects a sudden change in the air flow in the duct 13 and the output change exceeds the T1 value in T seconds. The obstacle 16 can be detected at an early stage.

In the above-described embodiment, the control unit 20a immediately stops the operation of the hot-air heater when it determines that there is an obstacle. However, as in the first embodiment, a display based on the determination that there is an obstacle is displayed. The operation of the warm air heater may be stopped afterwards.

(Embodiment 3) FIG. 8 is an operation diagram of a control section of a hot air heating apparatus in Embodiment 3 of the present invention. According to the invention of this embodiment, the control unit controls the output value of the air volume detector to increase,
When the predetermined value is reached, it is determined that there is an obstacle in front of the outlet and displayed, and after a predetermined time has elapsed from the first predetermined value,
The point that the operation of the heater is configured to be stopped is different from the invention of the first embodiment only, and the other parts having the same configuration and operation and effect are denoted by the same reference numerals, and detailed description is omitted. The different points will be mainly described with reference to FIGS. 1 to 3 and FIG.

The control unit 20b detects the pressure change due to the warm air 3 which has bounced off the obstacle 16 and flows from the opening 13a at the other end of the duct 13 toward the opening 13b at one end. Is detected, and as shown in FIG. 8, the output of the first predetermined value generated by the air volume detector 19 is input to determine and display the presence of the obstacle 16 on the appliance operation unit (not shown), Then, after a lapse of a predetermined time from the first predetermined value, the operation of the heater is stopped.

In the above embodiment, a normal heating operation is performed in the same manner as described in the first embodiment.

In particular, in this embodiment, when the case 6 is installed at a place where the obstacle 16 is located in front of the hot air outlet 5, the hot air 3 hits the obstacle 16 as shown in FIG. A large amount of warm air bounces toward the wind outlet 5. The bounced hot air 3 is sucked from the opening 13 a at the other end of the duct 13 by the rebound force and the ejector action of the duct 13, flows through the duct 13, and flows from the opening 13 b at one end to the ventilation passage 11. Then, the air volume detector 19 detects a pressure change due to a large amount of the hot air 3 passing through the duct 13, and outputs the detected pressure to the control unit 20b.

As shown in FIG. 8, when the output of the air volume detector 19 at S1 reaches the first predetermined value at S2, the control unit 20b determines that there is an obstacle at S3 and displays it. Further, in S4, it is determined whether a predetermined time has elapsed from the first predetermined value, and if the predetermined time has elapsed, the operation of the heater is stopped in S5.

Therefore, the air volume detector 19 directly detects that the hot air 3 that has bounced off the obstacle 16 flows from the opening 13a at the other end of the duct 13 toward the opening 13b at one end. Obstacles can be detected quickly.

The control unit 20b inputs the first predetermined value of the air volume detector 19 and indicates that the obstacle 16 is present in front of the hot air outlet 5, so that it is used here. If the person notices and removes the obstacle 16, the output of the first predetermined value of the air volume detector 19 disappears, and the heating operation can be continued as it is, which is very convenient in terms of usability of the heating appliance. If the user does not notice the indication of the presence of the obstacle 16, the operation of the appliance can be stopped when a predetermined time has elapsed from the first predetermined value of the air flow detector 19.

In addition, since the operation of the appliance is stopped after a lapse of a predetermined time from the first predetermined value of the air flow detector 19, the control unit is configured to output the output of the air flow detector 19 as in the first embodiment. This can be simpler than the case where the data is divided into the first predetermined value and the second predetermined value.

Although the air volume detector 19 detects the pressure change due to the passage of the warm air in the duct 13 in each of the above embodiments, the air volume change may be detected.

[0039]

As described above, the invention according to claim 1 is
Heater, and a blowing passage for guiding warm air generated by mixing the warm air generated by the heater and air taken in from the outside,
A convection fan that sends out hot air, a hot air outlet that blows out hot air, and one end is opened in an air passage near the convection fan, and the other end is opened facing the hot air outlet side to form an obstacle. There is a duct into which hot air that has hit and bounced flows, a wind volume detector that is installed in the duct and detects the flowing hot air, and an obstacle in front of the hot air outlet according to the output value of the wind volume detector. It is equipped with a control unit that stops the operation of the appliance, and can detect the presence of an obstacle in front of the hot air outlet and stop the operation of the appliance more quickly than the conventional technology, and the heating appliance is Protects you from exposure to high temperature hot air.

According to a second aspect of the present invention, there is provided a heater, a ventilation passage for guiding hot air in which hot air generated by the heater and air taken in from the outside are mixed, and a convection fan for sending out hot air. And a hot air outlet that blows out hot air, and one end of which is opened in a blowing passage near the convection fan, and the other end is opened facing the side of the hot air outlet and bounces off against an obstacle. An inflow duct, an air flow detector installed in the duct and detecting the inflowing hot air, and an output value of the air flow detector increases, and when the output value of the air flow detector reaches a first predetermined value, the hot air outlet is located forward. It determines that there is an obstacle and displays it.
After a lapse of a predetermined time from the predetermined value of
A control unit that stops the operation of the heater at a predetermined value of, the detection of the presence of an obstacle in front of the hot air outlet and the stop of operation of the appliance can be performed more quickly than in the conventional technology, The device can be protected from exposure to high temperature hot air.
Further, if the user can remove the obstacle by displaying the presence of the obstacle, the user can continue the operation without stopping the operation of the appliance, which can be very convenient in terms of usability of the heating appliance.

According to a third aspect of the present invention, the control unit is configured to detect an abnormality based on a degree of an output change amount of the air volume detector in order to detect an obstacle in front of the outlet at an early stage. Thus, the operation of the appliance can be stopped by quickly detecting an obstacle in front of the hot air outlet.

According to a fourth aspect of the present invention, the duct has one end opened to the air passage near the convection fan so that a negative pressure is generated by the flow of the warm air, and the other end rebounds against an obstacle. Facing the hot air outlet so that hot air can flow in, the hot air that has bounced off the obstacles can be positively flowed into the duct and obstructed in front of the hot air outlet. Objects can be detected quickly.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a gas hot air heating apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a duct portion of the gas hot air heating device.

FIG. 3 is a cross-sectional view of a duct portion of the gas hot air heating device when an obstacle occurs.

FIG. 4 is an operation diagram of a control unit of the gas hot air heating device.

FIG. 5 is a characteristic diagram of an air volume detector of the gas hot air heating device.

FIG. 6 is an operation diagram of a control unit of a hot air heating device according to a second embodiment of the present invention.

FIG. 7 is a characteristic diagram of an air volume detector of the gas hot air heating device.

FIG. 8 is an operation diagram of a control unit of a hot air heating device in Embodiment 3 of the present invention.

FIG. 9 is a cross-sectional view of a hot air heating device in a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 burner (heater) 4 convection fan 5 hot air blow-out port 11 ventilation passage 13 duct 13 a opening at other end 13 b opening at one end 19 air flow detector 20, 20 a, 20 b control unit

Claims (4)

[Claims] 1. A heater, a blower passage for guiding hot air in which hot air generated by the heater and air taken in from the outside are mixed, a convection fan for sending out hot air, and a hot air for blowing out hot air. A wind outlet, a duct through which one end is opened in an air passage near the convection fan, and the other end is opened facing the hot air outlet side, and a hot air that rebounds and hits an obstacle flows into the duct; The air temperature detector, which is installed in the inside and detects a hot air that has flowed in, and a control unit that determines that there is an obstacle in front of the appliance based on an output value of the air volume detector and stops the operation of the appliance. Wind heating system. 2. A heater, a blower passage for guiding hot air in which hot air generated by the heater and air taken in from the outside are mixed, a convection fan for sending out hot air, and a hot air for blowing out hot air. A wind outlet, a duct through which one end is opened in an air passage near the convection fan, and the other end is opened facing the hot air outlet side, and a hot air that rebounds and hits an obstacle flows into the duct; And an air flow detector for detecting the incoming hot air, and when the output value of the air flow detector increases and reaches a first predetermined value, it is determined that there is an obstacle in front of the outlet and displayed. And a control unit for stopping the operation of the heater after a lapse of a predetermined time from the first predetermined value or at a second predetermined value of the air volume detector. 3. The control unit according to claim 1, wherein the control unit detects an abnormality based on a degree of an output change amount of the air volume detector in order to detect an obstacle in front of the outlet at an early stage. A hot air heating device as described. 4. The duct has one end opened in a ventilation passage near the convection fan so as to generate a negative pressure due to the flow of warm air,
The hot-air heating device according to claim 1 or 2, wherein the other end is open facing the hot-air outlet side so that hot air that has hit the other end and bounced back flows in.