JP2000111168A - Warm air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely control a heating operation before a burning damage to an operation panel occurs at the time of stopping a supply fan during heating or bringing about a clogging accident of a warm air exhaust port. SOLUTION: An operation panel temperature sensor 19 fixedly wired together with other component in the case of passing a wiring printed circuit of a rear surface of an operation panel 13 provided on an upper surface of a warm air heater body 1 is provided. When the sensor 19 senses the temperature of the rear surface of the panel 13 in which an abnormal temperature rise occurs caused by an exposure with a radiant heat from a warm air chamber wall 11 in which an abnormal overheat occurs, a central controller effectively stops a combustion operation of a burner 2, thereby assuring a safety of the heater.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-air heater for heating by generating hot air.

[0002]

2. Description of the Related Art Conventionally, a heater for heating a room with warm air is provided with a room temperature detecting element for detecting the temperature of room air in a part of the body, and based on a value detected by the room temperature detecting element. The temperature and discharge amount of the hot air were adjusted.

In addition, an abnormal temperature detecting element is mounted on a relatively upper portion of the body, at a position where the temperature rises quickly when an abnormal situation such as a stoppage of a hot air fan or a blockage of a hot air outlet occurs. When the abnormal temperature detecting element detects abnormal overheating of the airframe, the operation of the heat source is stopped immediately, and safe operation is enforced.

[0004] Among these temperature detecting elements, as for the mounting position of the abnormal temperature detecting element, an operation panel mounted on the upper part of the body is equipped with an electronic circuit on which a large number of electronic parts are mounted in accordance with recent computerization of control. Since the board was used, it was important to detect the temperature near the panel, including the protection of the operation panel.Therefore, an abnormal temperature detection element was provided near the panel, The panel has been protected from abnormal overheating and the panel has been protected from abnormally high temperatures.

[0005]

However, detecting the temperature in the vicinity of the operation panel does not mean detecting the temperature of the operation panel itself. Therefore, in order to prevent the operation panel from burning, an abnormal temperature detection element is required. In order to install the equipment, the optimum installation position had to be selected in each case in accordance with the heat source and the capabilities and properties of the blower fan. That is, the optimum design had to be performed for each model of the hot air heater.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a main body of a warm air heater, a heat source provided in the main body, and a wall of the main body. The opened hot air outlet, a blower fan that discharges hot air from this hot air outlet, a hot air chamber where the air blown by the blower fan is heated by a heat source, and the hot air chamber and the upper surface of the main body A hot air chamber wall that isolates hot air from leaking out, an operation start instruction device, an operation stop instruction device, a room temperature setting device, and an operation status indicator are mounted on the outer surface, and a printed circuit for wiring is formed. The operation start instructing device, the operation stop instructing device, the room temperature setting device and the operation status indicator are electrically connected via a solder bath on the inner back surface, and the inner back surface on which the wiring printed circuit is formed is a hot air chamber. On the top of the main unit so that it faces the wall The operation panel installed, and the operation start instructing device, the operation stop instructing device, the room temperature setting device, and the operation status indicator mounted on the wiring printed circuit side on the back surface of the operation panel are connected to the wiring printed circuit. An operation panel temperature detecting element that is connected and attached at the same time as being connected to
The warm air heater is constituted by the operation start instruction device, the operation stop instruction device, the room temperature setting device, and the central control device that controls the heat source, the blower fan, and the operation status indicator based on the signals of the room temperature detecting element.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is configured as described above, and abnormalities occur due to the failure of the blower fan or the blockage of the hot air discharge port during the heating operation, making it difficult to discharge hot air. When overheating occurs, it is installed on the printed circuit for wiring on the back of the operation panel provided on the top part of the hot air heater so that it is fixedly connected with other parts when passing through the solder bath The central control unit generates heat by making the operating panel temperature detection element accurately detect the temperature of the back side of the operating panel, which has been exposed to radiant heat from the heating section that has been overheated and has caused an abnormal rise in temperature. The operation can be stopped reliably, and the safety of the hot air heater is further enhanced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail below using an example of a liquid fuel combustion type hot air heater.

1 and 2, reference numeral 1 denotes a main body of a liquid fuel combustion type hot air heater called a fan heater, 2 denotes a burner, 3 denotes a vaporizer for vaporizing kerosene, and 4 heats the vaporizer 3. An electric heater, 5 is an oil pan, and 6 is an oil pan 5
A kerosene pump that feeds the kerosene in the oil pan 5 to the vaporizer 3; a nozzle 8 of the vaporizer 3; and 9 that sends combustion air to the burner 2 and is generated by combustion. A blower fan 10 for sending the heated high-temperature gas out of the main body of the heater is installed so as to cover an upper portion of the burner 2.
The hot air chamber 11 is mixed with the high-temperature combustion gas generated in the above, and is heated to produce hot air.
A hot air chamber wall which separates the upper shell from the hot air chamber so as not to leak hot air, and a hot air outlet 12 from which the hot air generated in the hot air chamber 10 is discharged.

Reference numeral 13 denotes an operation panel provided on the upper surface of the hot air heater 1, 14 denotes an operation start instruction switch, 15 denotes an operation stop instruction switch, 16 denotes a room temperature setting device, and 17 denotes a room temperature setting device.
Is an operation state indicator for displaying a set room temperature, an actual room temperature, and the like. Reference numeral 18 denotes a printed circuit board for wiring constituting a basic structural material of the operation panel 13. The above-mentioned operation start instruction switch 14, operation stop instruction switch 15, room temperature setting device 16, and operation state display are provided on the outer upper surface (front surface). A printed circuit for wiring is formed on the inner lower surface (back surface).

Reference numeral 19 denotes an operation panel temperature detecting element (thermistor) attached to the wiring printed circuit on the back surface of the wiring printed circuit board 18 for detecting the temperature of the operation panel 13 at the time of abnormal overheating. . The operation panel temperature detecting element 19 is temporarily fixed to a printed circuit for wiring on the back surface, and then passed through a solder bath and firmly mounted and connected.

Reference numeral 20 denotes a room temperature detecting element attached to the lower rear portion of the hot air heater 1 for detecting the temperature of the air in the room to be heated. Reference numeral 21 denotes a vaporizer for detecting the temperature of the vaporizer 3 described above. The temperature detecting element 22 is a flame detecting element that detects the presence of a flame by coming into contact with the flame generated in the burner 2.

Next, FIG. 3 illustrates a control system according to an embodiment of the present invention. Reference numeral 23 denotes a central control unit (microcomputer), which has already described the operation start instruction switch 14, the operation stop instruction switch 15, and the room temperature. The electric heater 4, the kerosene pump 7, the blower fan 9, and the operating state display are set based on inputs from the setting device 16, the operation panel temperature detecting element 19, the room temperature detecting element 20, the vaporizer temperature detecting element 21, and the flame detecting element 22. 17 for driving control.

In such a configuration, when the operation start instruction switch 14 is operated to instruct the start of operation, the central controller 23 starts energizing the electric heater 4 of the vaporizer 3 and detects the vaporizer temperature. The temperature of the vaporizer 3 is detected through the element 21, and when the temperature reaches a combustion startable temperature, the kerosene pump 7 is operated to increase the pressure in the vaporizer 3, and the vaporized gas is ejected from the nozzle 8. At the same time, an igniter (not shown) is activated to cause the burner 2 to generate a flame. Then, when the presence of a flame is confirmed by the flame detection element 22, the blower fan 9 is operated to blow air to the warm air chamber 10, and the generated warm air is discharged out of the main body 1 of the heater. After the combustion is started, the central controller 23 controls the carburetor 3 to maintain the temperature necessary for maintaining the normal combustion.
The electric heater 4 is controlled while monitoring the signal of the vaporizer temperature detecting element 21.

During the combustion operation, the high-temperature combustion gas generated by the burner 2 becomes relatively low-temperature hot air in the hot-air chamber 10 while the blowing fan 9 is performing a normal blowing operation without stopping. Since the air is discharged from the hot air discharge port 12, the temperature of the hot air chamber wall 11 does not become abnormally high.
The back surface of the operation panel 13 exposed to the radiant heat opposite to 1 also does not become abnormally high.

When the room temperature set by the room temperature setting device 16 is detected by the room temperature detecting element 20, the central control device 23 lowers the driving output of the kerosene pump 7 to lower the combustion output and maintain the constant room temperature. aim. In the meantime, if the decrease in the room temperature is remarkable, the combustion output is increased to recover the room temperature. On the other hand, when the room temperature equal to or higher than the set room temperature is observed, the driving of the kerosene pump 7 and the driving of the blower fan are stopped. Stop burning.

While the combustion is stopped in order to maintain the set room temperature, the central control unit 23 keeps energizing the electric heater 4 of the carburetor so that the combustion can be restarted at any time to recover the room temperature. To maintain the standby state.

Next, the blower fan 9 is stopped during the combustion operation, or the hot air discharge port 12 is closed and the hot air chamber wall 11 is closed.
Will be described when an abnormal temperature rise occurs.

In this case, the hot air chamber 10 is filled with high-temperature combustion gas, and the temperature of the wall 11 of the hot air chamber keeps increasing, so that it is not directly exposed to the combustion gas. Exposure to the radiant heat of the wall 11 keeps the temperature of the back surface of the operation panel 13 also rising.

In the meantime, the central controller 23 continues to observe the temperature on the back surface of the operation panel 13 through the operation panel temperature detecting element 19, and when it is recognized that the temperature exceeds a preset temperature, as shown in FIG. When the timer is started and the detected value does not fall below the preset temperature within the timer time, it is determined that an abnormal temperature has been detected, and the driving of the kerosene pump 7 is stopped to stop the heating operation. At the same time, the operation status indicator 17 is driven to notify the occurrence of abnormal overheating. In this case, since the operation panel temperature detecting element 19 is attached to the wiring printed circuit board 18 by soldering, when the back surface of the operation panel 13 is exposed to the radiant heat from the warm air chamber wall 11, the operation panel 13 The temperature rises together with the back surface, and the temperature on the back surface of the operation panel 13 is accurately detected. In other words, an erroneous temperature that does not accurately reflect the temperature on the back surface of the operation panel 13 is not detected.

Since the operation panel temperature detecting element 19 is fixedly connected to other parts at the time of the solder bath on the back surface of the operation panel 13, the operation panel 13 is naturally handled after passing through the solder bath. This operation panel temperature detection element 19 will also be handled,
A hot air heater without the trouble of having to handle it separately from the operation panel 13 could be obtained.

With respect to the above-mentioned preset temperature, that is, the value treated as an abnormal temperature and the timer time value of the timer, it is inevitable that overshoot will occur after the combustion is stopped, and furthermore, if the overshoot occurs, It is important to determine the components that make up the panel 13 in consideration of preventing dissolution of the resin used in particular.

When the stop control of the combustion operation is executed because the abnormal temperature is detected through the operation panel temperature detection element 19, the operation of the central control unit 23 must be reset before the operation is restarted. Needless to say, it is extremely important to ensure safety.

[0024]

As described above, according to the present invention, when an abnormal overheating occurs due to a difficulty in discharging hot air due to a failure stop of a blower fan or a blockage of a hot air discharge port during a heating operation, the temperature increases. An operation panel temperature detection element provided on the printed circuit for wiring on the back side of the operation panel provided on the upper surface portion of the wind heater main body so as to be fixedly connected to other components when passing through the solder bath. However, since the temperature of the back surface of the operation panel, which has been abnormally heated by being exposed to the radiant heat from the heat generating portion that has abnormally overheated, is accurately detected, the central control device can reliably stop the heat generating operation. As a result, the safety of hot air heaters can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view for explaining a schematic configuration of an embodiment of the present invention.

FIG. 2 is a schematic view of a combustion section according to one embodiment of the present invention.

FIG. 3 is a block diagram illustrating control according to an embodiment of the present invention.

FIG. 4 is a sequence diagram of abnormal overheat detection control according to one embodiment of the present invention.

[Explanation of symbols]

1: Hot air heater with liquid fuel combustion, 2: Burner, 9:
Blowing fan, 11: hot air chamber wall, 12: hot air outlet, 1
3: Operation panel, 14: Operation start instruction switch, 15:
Operation stop instruction switch, 16: room temperature setting device, 17: operation state display, 18: printed circuit board for wiring, 19: operation panel temperature detection element, 20: room temperature detection element, 23: central control device.

Claims (1)

[Claims] 1. A main body (1) of a warm air heater, a heat source (2) provided in the main body, a hot air discharge port (12) opened in one wall of the main body, A blower fan (9) for discharging warm air from a wind discharge port, and a warm air chamber (10) in which the air blown by the blower fan is heated by the heat source
A warm air chamber wall (11) for isolating the warm air chamber from the upper surface of the main body so that hot air does not leak, an operation start instruction device (14), an operation stop instruction device (15), and room temperature setting While the device (16) and the operation status indicator (17) are loaded on the outer surface, the operation start instruction device, the operation stop instruction device, the room temperature setting device and the operation status are provided on the inner rear surface where the printed circuit for wiring is formed. An operation panel (13) installed on the upper surface of the main body such that the display is electrically connected via a solder bath and the inner back surface on which the printed circuit for wiring is formed faces the wall of the warm air chamber; When the operation start instruction device, the operation stop instruction device, the room temperature setting device, and the operation status display device are mounted on the wiring printed circuit side on the back surface of the operation panel and connected to the wiring printed circuit via a solder bath. Simultaneously Is the attached operating panel temperature detecting element (19), room temperature detecting element for detecting the room temperature (2
0), and a central control device (23) for controlling the heat source, the blower fan and the operation status display based on signals from the operation start instruction device, the operation stop instruction device, the room temperature setting device and the room temperature detecting element. A warm air heater characterized by being constituted.