JP2015096777A - Warm air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a warm air heater capable of preventing an in-device temperature from reaching an abnormally-high temperature, even when an operation is started in a state that an air draft duct is closed, and the inside of a main body has a low temperature.SOLUTION: In starting an operation of a warm air heater in which the air supplied from an indoor side and a combustion gas exchange heat by a heat exchanger 11 to supply warm air, an abnormality determination temperature is set at a low temperature when a temperature in a main body is lower than a prescribed temperature, so that the temperature in the main body does not increase to the abnormally-high temperature even when the operation is started in a state that an air draft duct is closed and the temperature in the main body is low, the temperature in the main body rapidly increases to be equal to or higher than an abnormal overheat determination temperature, the operation is stopped on the basis of the determination of abnormal overheat, and the temperature in the main body further increases thereafter and overshoots. Further, a main body surface of the warm air heater is prevented from being high temperature due to the overshoot, and components and a substrate in the main body are prevented from being damaged by high temperature, and shortening their service life.

Description

  The present invention relates to a hot-air heater called a so-called FF type which performs heating by exchanging heat between exhaust gas generated by combustion and room air.

  Conventionally, in this type of device, an abnormal temperature rise in the main body of the instrument due to a shortage of inflow air is detected at an early stage using a thermistor that detects the temperature in the main body, thereby preventing abnormal temperature overheating of the instrument. There was a thing. (For example, see Patent Document 1)

Japanese Patent Laid-Open No. 06-123425

  By the way, in this conventional type, for example, dust or the like gradually adheres to the filter provided at the air intake port of the convection fan, the amount of inflow air gradually decreases, the temperature in the main body rises, and dust or the like adheres. When the temperature reaches the specified level, the temperature inside the main unit reaches the abnormality judgment temperature and the operation is stopped.In this case, the temperature change until the abnormality judgment temperature is reached rises slowly and reaches the abnormality judgment temperature. The temperature in the main body after the operation is stopped decreases after overshooting to a temperature 10 to 20 ° C. higher than the abnormality determination temperature.

  However, if the air intake port of the convection fan or the entire surface of the hot air outlet is blocked by something, if the operation switch is turned on when the temperature inside the main unit is low, it is determined that the room temperature is low and the thermal power is reduced. Since the temperature inside the main body suddenly rises from the start of operation and the temperature inside the main body reaches the abnormality judgment temperature and the operation is stopped, the temperature inside the main body is higher than the abnormality judgment temperature. Overshooting to a temperature higher by 50 ° C. or more causes problems such that the surface of the main body of the hot air heater becomes high temperature, components and boards in the main body are damaged by high temperature, and the life is shortened.

  In order to solve the above-mentioned problems, in claim 1 of the present invention, a combustion blower for blowing combustion air, a fuel supply means for sending fuel, a combustion air from the combustion blower and a fuel supply means Combustion unit composed of a burner unit and an outer cylinder for mixing and burning fuel, a heat exchanger in which combustion gas from the combustion unit passes through a heat exchange pipe, and supplying outdoor air and combustion gas Air supply / exhaust cylinder that exhausts the air to the outside, a convection blower that blows indoor air to the heat exchanger, and an abnormal overheat detection means that detects the temperature inside the main body. Exchanging heat with a heat exchanger and blowing it out as hot air from the outlet of the main unit. To a hot air heater that stops operation There are, when starting operation ignited combustion unit, when the temperature of the body that the overheating detection means detects is below a predetermined temperature, and sets an abnormal overheat determination temperature lower than normal temperature.

  According to a second aspect of the present invention, a combustion blower for blowing combustion air, a fuel supply means for sending fuel, and a burner unit for mixing and burning the combustion air from the combustion blower and the fuel from the fuel supply means A combustion section composed of an outer cylinder, a heat exchanger through which combustion gas from the combustion section passes through a heat exchange pipe, a supply / exhaust cylinder for supplying outdoor air and exhausting the combustion gas to the outdoors A convection blower that blows indoor air to the heat exchanger, and an abnormal overheat detection means that detects the temperature in the main body, and heat exchange between the air supplied from the room and the combustion gas with the heat exchanger Hot air heating that blows out as hot air from the air outlet of the main body and stops the operation by extinguishing the combustion part by judging that it is abnormal overheating when the main body temperature detected by the abnormal overheat detection means exceeds the abnormal overheat determination temperature In the machine, ignite the combustion part and operate When starting, when the temperature in the main body detected by the abnormal overheat detecting means is equal to or lower than a predetermined temperature, the abnormal overheat determination temperature is set to a temperature lower than the normal time for a predetermined time, and after the predetermined time has elapsed, the normal abnormal overheat determination temperature It is something to return to.

  According to claim 1 of the present invention, when the temperature in the main body detected by the abnormal overheat detecting means is equal to or lower than a predetermined temperature when the combustion part is ignited and the operation is started, the abnormal overheat determination temperature is set to a temperature lower than normal. Therefore, the temperature inside the main unit is kept at a predetermined temperature with a towel on the back of the main unit or an object placed on the front of the main unit and the air passage and the outlet in the center of the front are almost or completely blocked. Even if the thermal power is increased and the operation is started because it is lower, after the temperature inside the main body suddenly rises and the temperature inside the main body exceeds the abnormal overheat judgment temperature, it is judged as abnormal overheat and the operation is stopped. Even if the temperature inside the main unit rises and overshoots, the temperature inside the main unit does not increase to an abnormally high temperature, and the surface of the main unit of the hot air heater becomes hot due to overshoot, or parts inside the main unit. Or the substrate is hot Damaged or the life is one that can be prevented from becoming shorter.

According to a second aspect of the present invention, when the temperature in the main body detected by the abnormal overheat detecting means is equal to or lower than a predetermined temperature when the combustion section is ignited and the operation is started, the abnormal overheat determination temperature is set to a temperature lower than normal. Is set for a predetermined time, and after the elapse of the predetermined time, it returns to the normal abnormal overheat determination temperature, so if there is no abnormal overheat due to overshoot of the temperature in the main body at the start of operation, normal abnormal overheat determination is continued while continuing operation Can be done.

The perspective view of the warm air heater which attached | subjected one Example of this invention. FIG. The block diagram. The flowchart figure at the time of the same operation start.

Next, a hot air heater according to the present invention will be described with reference to an embodiment shown in the drawings.
Reference numeral 1 denotes a hot air heater main body, which is provided with a blowout port 2 for blowing out hot air from the front center to the lower part, and an operation unit 4 having a plurality of buttons such as an operation switch 3 and a temperature setting switch (not shown) on the upper surface of the main body. And a display unit 5 for displaying temperature and time on the front upper part of the main body, and an air supply unit (not shown) for supplying outdoor air to the hot air heater on the back surface. An air supply / exhaust cylinder (not shown) including an exhaust part (not shown) for exhausting the exhaust gas of the hot air heater to the outdoors is connected.

  Reference numeral 6 denotes a combustion section, which supplies kerosene sent from a fuel pump as fuel supply means (not shown) and combustion air sent from a combustion blower (not shown) to an ignition device (not shown). The burner part 7 which combusts by igniting and the outer cylinder 8 which guide | induces the combustion gas of this burner part 7 as exhaust gas is comprised.

  Reference numeral 9 denotes a box-shaped exhaust chamber, which has an outer cylinder 8 attached to the lower part thereof, and is provided with a bypass plate (not shown) for bypassing exhaust gas flowing from the outer cylinder 8 inside. In addition, an inclined portion 10 is formed on the upper surface so as to be lowered from the center portion toward the end, from the center portion toward the front surface of the hot air heater body 1 and from the center portion toward the back surface of the hot air heater body 1. It is what.

  A heat exchanger 11 is provided above the exhaust chamber 9, and has a box-like inflow portion 12 into which exhaust gas from the exhaust chamber 9 flows, and a substantially pipe-like end connected to the inflow portion 12. A plurality of heat exchange pipes 13 through which exhaust gas from the interior passes, and an exhaust section (not shown) of a supply / exhaust cylinder (not shown) connected to the other end and connected to the other end of the heat exchange pipe 13 And a box-shaped outflow part (not shown) for guiding the exhaust gas that has passed through the heat exchange pipe 13 to the exhaust part.

  Reference numeral 14 denotes a convection blower made of a propeller fan, which is provided behind the heat exchanger 11 and is driven by a convection motor 15 to suck indoor air and blow it downward.

  Reference numeral 16 denotes an abnormal overheat detecting means comprising a thermistor, which is attached to a heat shield plate 17 provided above the heat exchanger 11 and detects the temperature inside the main body by detecting the temperature of the heat shield plate 17. is there.

A control unit 18 controls the hot air heating operation so that the room temperature becomes the set temperature.
Reference numeral 19 denotes a timer, which measures time based on a timing start signal and a timing stop signal from the control unit 18.

Next, the operation of one embodiment of the present invention will be described.
First, when a built-in heater (not shown) is energized and the burner unit 7 rises to a predetermined temperature, kerosene is sent from the fuel pump to the burner unit 7 and vaporized, and the burner unit 7 is supplied with a combustion blower. Combustion air is sent, and the vaporized kerosene and combustion air are mixed and ignited by an ignition device (not shown) to start combustion.

  Combustion gas as exhaust gas passes through the outer cylinder 8 from the burner portion 7 and rises, is guided by a bypass plate in the exhaust chamber 9 and bypasses the exhaust chamber 9, and flows into the inflow portion of the heat exchanger 11. 12 passes through the heat exchange pipe 13, flows from the outflow part to the exhaust part of the supply / exhaust cylinder, and is exhausted to the outdoors.

  When combustion is started in the burner unit 7, the convection blower 14 located behind the heat exchanger 11 is driven to supply indoor air into the hot air heater body 1 and the air is supplied. The indoor air is blown forward from the convection blower 14, passes through the outer periphery of the heat exchange pipe 13 of the heat exchanger 11, is heated by heat exchange, and then the outlet 2 on the front surface of the hot air heater body 1. It blows out as warm air into the room.

Next, the control at the start of operation will be described with reference to the flowchart shown in FIG.
First, when the operation switch 3 is turned on (S1), the control unit 18 energizes the built-in heater and the burner unit 7 rises to a predetermined temperature, and kerosene is sent from the fuel pump to the burner unit 7. Vaporization is performed and combustion air is sent to the burner unit 7 from the combustion blower. The vaporized kerosene and combustion air are mixed and ignited by an ignition device (not shown) to start combustion and start heating operation. To do. (S2)

  If the operation switch 3 is turned OFF before starting the heating operation in (S2) (S3), the control unit 18 stops the operation for starting combustion, stops the operation (S4), and returns to (S1). Is.

When the heating operation is started in (S2), the control unit 18 determines whether or not the temperature inside the main body detected by the abnormal overheat detection means 16 is equal to or lower than a predetermined temperature. (S5)
In this embodiment, the predetermined temperature is set to 35 ° C., and when the temperature inside the main body detected by the abnormal overheat detecting means 16 is 35 ° C. or less which is the predetermined temperature, the abnormal overheat determination temperature is set to a low temperature of 80 ° C. (S6) When the temperature inside the main body detected by the abnormal overheat detecting means 16 is higher than a predetermined temperature of 35 ° C., the abnormal overheat determination temperature is set to a high temperature of 115 ° C. (S7)

  After the abnormal overheat determination temperature is set to a low temperature of 80 ° C. in (S6), the control unit 18 next starts counting by the timer 19 (S8), and the control unit 18 measures the time by the timer 19 in (S8). After the start, it is determined whether or not the temperature inside the main body detected by the abnormal overheat detection means 16 is 80 ° C. or more of the abnormal overheat determination temperature set in (S6) (S9), and the internal temperature detected by the abnormal overheat detection means 16 When the temperature is 80 ° C. or higher, it is determined that the overheating is abnormal (S10), the operation is stopped (S11), and an abnormal display is displayed on the display unit 5. (S12)

  In (S9), when the temperature inside the main body detected by the abnormal overheat detecting means 16 is less than the abnormal overheat determination temperature of 80 ° C., it is determined whether the timer 19 has counted a predetermined time, in this embodiment, 6 minutes. Determination is made (S13), and when the time measured by the timer 19 has passed a predetermined time, the time measured by the timer 19 is stopped (S14), and the process proceeds to (S7).

  If the time measured by the timer 19 has not passed the predetermined time in (S13), it is confirmed whether the operation switch 3 has been turned OFF (S15). If the operation switch 3 has been turned OFF, the operation proceeds to (S4). If the operation switch 3 is not turned OFF, the process returns to (S9).

  In (S7), after the abnormal overheat determination temperature is set to a high temperature of 115 ° C., the controller 18 detects the abnormal overheat detection temperature of the main body detected by the abnormal overheat detection means 16 as 115, which is the abnormal overheat determination temperature set in (S7). It is determined whether or not the temperature is higher than or equal to ° C. (S16), and when the internal temperature detected by the abnormal overheat detecting means 16 becomes 115 ° C. or higher, the process proceeds to (S10), and the internal temperature detected by the abnormal overheat detecting means 16 is abnormal overheat determination. When the temperature is lower than 115 ° C., it is confirmed whether the operation switch 3 is turned OFF (S17). If the operation switch 3 is turned OFF, the process proceeds to (S4), and if the operation switch 3 is not turned OFF ( The process returns to S16).

Thereby, for example, when a towel is put on the back of the main body or an object is placed on the front of the main body, and the air outlet 2 or the outlet 2 at the center of the front surface is almost or completely blocked, the temperature in the main body is predetermined. When the operation switch is turned on when the temperature is lower than the temperature, the control unit 18 determines that the room temperature is low and starts operation by increasing the thermal power. However, when the temperature inside the main body is lower than the predetermined temperature, the abnormality determination temperature is lowered. Therefore, after the temperature inside the body suddenly rises and the temperature inside the body exceeds the abnormal overheat judgment temperature and is judged to be abnormal overheat, and the operation is stopped, the temperature inside the body continues to rise. Even if overshooting occurs, the temperature inside the main unit will not rise to an abnormally high temperature, and the main surface of the hot air heater will become hot due to overshooting, and the components and boards in the main unit may be damaged by high temperatures One in which it is possible to prevent the Kunar's.

  In addition, when the temperature inside the main body is below the specified temperature at the start of operation, the abnormal overheat determination temperature is set to a low temperature, but after the predetermined time has elapsed after setting the low temperature, it is set to a high temperature that is the normal abnormal overheat determination temperature. Therefore, if there is no abnormal overheating due to overshoot of the temperature in the main body at the start of operation, normal abnormal overheat determination can be performed while continuing the operation.

2 Outlet 6 Combustion part 7 Burner part 8 Outer cylinder 11 Heat exchanger 13 Heat exchange pipe 14 Convection fan 16 Abnormal overheat detection means

Claims (2)

  Combustion consisting of a combustion blower for blowing combustion air, a fuel supply means for sending fuel, a burner section and an outer cylinder for mixing and burning combustion air from the combustion blower and fuel from the fuel supply means A heat exchanger through which the combustion gas from the combustion section passes through a heat exchange pipe, a supply / exhaust cylinder for supplying outdoor air and exhausting the combustion gas to the outdoors, and heat exchange between indoor air A convection blower that blows air to the chamber and an abnormal overheat detection means that detects the temperature inside the main body, heat exchange between the air supplied from the room and the combustion gas with a heat exchanger, and warm air from the outlet of the main body In the hot air heater, the main body temperature detected by the abnormal overheat detection means is equal to or higher than the abnormal overheat determination temperature. When starting operation after igniting If the temperature in the body to overheat detecting unit detects is less than a predetermined temperature, warm-air heating machines and sets an abnormal overheat determination temperature lower than normal temperature   Combustion consisting of a combustion blower for blowing combustion air, a fuel supply means for sending fuel, a burner section and an outer cylinder for mixing and burning combustion air from the combustion blower and fuel from the fuel supply means A heat exchanger through which the combustion gas from the combustion section passes through a heat exchange pipe, a supply / exhaust cylinder for supplying outdoor air and exhausting the combustion gas to the outdoors, and heat exchange between indoor air A convection blower that blows air to the chamber and an abnormal overheat detection means that detects the temperature inside the main body, heat exchange between the air supplied from the room and the combustion gas with a heat exchanger, and warm air from the outlet of the main body In the hot air heater, the main body temperature detected by the abnormal overheat detection means is equal to or higher than the abnormal overheat determination temperature. When starting operation after igniting When the temperature in the main body detected by the overheat detection means is lower than or equal to a predetermined temperature, the abnormal overheat determination temperature is set to a temperature lower than the normal time for a predetermined time, and after the predetermined time has elapsed, it is returned to the normal abnormal overheat determination temperature. Hot air heater

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