JP2007162985A - Forced air supply and exhaust type combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe forced air supply and exhaust type combustion device for surely detecting leakage of combustion gas from the combustion device and making the combustion device stop. <P>SOLUTION: The combustion device body 10 includes a combustion fan 6 for sucking combustion air from the outside via a supply and discharge duct 4 provided via a wall 3, a combustion burner 1 for burning with the combustion air supplied from the combustion fan 6, a heat exchanger 8 for conducting heat exchange between a combustion gas by combustion of the combustion burner 1 and indoor air supplied from a convection fan 9. The combustion device body 10 releases hot air after heat exchange into a room for heating and exhausts the combustion gas, after heat exchange to the outside via the supply and discharge duct 4. A leakage detection means 13 is provided in the combustion device body 10, a supply and discharge duct 4 or an air supply pipe 5 and an exhaust gas pipe 12 for connecting the combustion device body 10 to the supply and discharge duct 4. By making combustion stop when leakage of the combustion gas is detected, the room will not be in an abnormal state, and the combustion device can always be used with security. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a forced supply / exhaust combustion apparatus that burns outdoor air as combustion air, heats and heats indoor air with the combustion gas generated by the combustion, and exhausts the combustion gas whose temperature has decreased to the outdoors. Is.

Conventionally, in this type, outdoor air is sucked by a combustion fan through an air supply / exhaust pipe, supplied as combustion air to a combustion burner, and fuel oil is burned into fuel, and the combustion gas generated by this combustion and a convection fan Heat exchanged with indoor air blown by a heat exchanger, the combustion gas whose temperature has dropped is exhausted to the outside through a supply / exhaust tube, and the indoor air heated by this heat exchange is heated with warm air Therefore, comfortable heating can be performed without polluting indoor air. (For example, refer to Patent Document 1.)
Japanese Patent No. 3364203

  By the way, with this conventional type, normal combustion cannot be performed if there is damage or deterioration such as a supply pipe or exhaust pipe being disconnected or a hole being drilled in the combustion appliance body, and unburned gas leaks from here, which is a big problem In particular, when CO (carbon monoxide) is mixed, it becomes a very dangerous state.

  The present invention pays attention to this point and solves the above-mentioned drawbacks. In particular, in the present invention, in claim 1, a combustion fan for sucking combustion air from the outside through a supply / exhaust tube penetrating the wall, and the combustion fan A combustion appliance main body comprising a combustion burner that burns with supplied combustion air, and a heat exchanger that exchanges heat between combustion gas generated by combustion of the combustion burner and room air supplied from a convection fan. A device that discharges hot air into the room and heats it, and exhausts the combustion gas after heat exchange to the outside through the air supply / exhaust tube, in the combustion device body, the air supply / exhaust tube, or the combustion device The air supply pipe and exhaust pipe connecting the main body and the supply / exhaust cylinder are provided with a leakage detection means for detecting leakage of combustion debris, and combustion is stopped when leakage of combustion gas is detected.

  According to a second aspect of the present invention, the leak detection means is constituted by a pressure sensor for detecting the exhaust pressure.

  According to a third aspect of the present invention, the leak detection means comprises an air supply pressure sensor for detecting the air supply pressure, an exhaust pressure sensor for detecting the exhaust pressure, and a pressure comparison circuit for detecting a pressure difference between the two pressure sensors. Is.

  According to a fourth aspect of the present invention, the leak detection means is constituted by a temperature sensor for detecting the temperature in the combustion appliance body or the exhaust gas temperature.

  According to a fifth aspect of the present invention, the leak detection means is constituted by a CO sensor provided in the combustion appliance body.

  According to a sixth aspect of the present invention, the leakage detection means is constituted by a load detection circuit that detects a load applied to the combustion fan.

  According to the first aspect of the present invention, when the combustion gas leaks into the room, the leak detection means detects this and stops the combustion quickly, so that the room does not become abnormal and is always safe. It can be used with heart.

  According to the second aspect of the present invention, it is possible to reliably detect the leakage of the combustion gas by detecting the change in the exhaust pressure with the pressure sensor.

  According to the third aspect of the present invention, since a pressure difference is generated between the supply air pressure and the exhaust gas pressure, the leakage of the combustion gas can be detected more reliably.

  According to the fourth aspect of the present invention, the temperature rise in the combustion appliance body or the decrease in the exhaust gas temperature is detected by the temperature sensor, so that the leakage of the combustion gas can be reliably detected with a simple structure and low cost. .

  Further, according to the fifth aspect, by detecting CO in the combustion appliance main body, leakage of combustion gas can be detected by detecting the most dangerous gas, and safety can be improved.

  According to the sixth aspect of the present invention, by detecting the change in the load applied to the combustion fan, it is possible to reliably detect the leakage of the combustion residue without adding any new parts.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is a combustion burner provided in the lower part of the combustion cylinder 2, which communicates with a double-pipe type supply / exhaust cylinder 4 penetrating the wall 3 through an intake pipe 5 and a combustion fan 6, and electromagnetically uses outdoor air as combustion air. The fuel supplied from the pump 7 is burned into fuel.

  A heat exchanger 8 communicates with the combustion cylinder 2 for exchanging heat between the combustion gas generated by the combustion of the combustion burner 1 and the indoor air blown by the convection fan 9, and the heat exchange resulted in a high temperature. The indoor air is blown out as clean hot air from a blow-out port 11 formed on the front surface of the combustion appliance main body 10 to heat the room warm air. Further, the combustion gas whose temperature has dropped due to heat exchange passes through the exhaust pipe 12. The exhaust gas is exhausted from the street supply / exhaust tube 4 to the outside.

  Reference numeral 13 denotes a pressure sensor that constitutes a leak detection means, which is provided in the middle of the exhaust pipe 12 connecting the heat exchanger 8 and the supply / exhaust cylinder 4, and detects the detected pressure in the normal combustion state and the combustion fan from the supply / exhaust cylinder 4 Combustion gas leaks from an air supply path from the air supply pipe 5 to the combustion burner 1 through 6, and an exhaust path from the combustion burner 1 to the combustion cylinder 2, the heat exchanger 8, and the exhaust pipe 12 to the air supply / exhaust cylinder 4. The pressure drop at this time is detected and the combustion of the combustion burner 1 is stopped.

  The leak detection will be described in detail with reference to the block diagram of the electric circuit of FIG. 2. The microcomputer 14 always takes in the detected pressure of the pressure sensor 13 and stores the normal pressure, and the combustion gas from the supply passage or the exhaust passage. When there is a leak, the detected pressure drops, and this is compared with the stored normal pressure, and when it is determined that the pressure has dropped, a combustion stop signal is output to the combustion control circuit 15.

  Next, the operation of the embodiment of the present invention will be described. When the current operation is instructed, the combustion burner 1 is supplied with fuel oil from the electromagnetic pump 7 and driven by the combustion fan 6 via the supply / exhaust cylinder 4. When outdoor air is supplied as combustion air and ignited by appropriate ignition means (not shown), the combustion burner 1 starts combustion.

  Further, the combustion gas generated by the combustion of the combustion burner 1 passes through the combustion cylinder 2 and is heat-exchanged with the indoor air blown by the convection fan 9 in the heat exchanger 8. The combustion gas that has been released as wind to heat the room and that has fallen in temperature due to this heat exchange is exhausted to the outside through the exhaust pipe 12 and the supply / exhaust cylinder 4, and this is repeated sequentially. The room is heated.

  In this combustion state, when a combustion gas leaks due to a disconnection or a hole due to deterioration in the air supply path or exhaust path, the pressure sensor 13 detects that the detected pressure has dropped, and the output from the microcomputer 14 The combustion of the combustion burner 1 is extinguished by stopping the driving of the electromagnetic pump 7 and the combustion fan 6 by the combustion control circuit 15.

  Therefore, it is possible to reliably prevent a dangerous condition that the combustion gas fills the room without knowing and causes poisoning of monoxide gas, and it can be used safely for a long time, improving safety. It can be done.

  Note that the pressure sensor 13 detects not only combustion gas leakage but also the detected pressure drops even when the supply path side is blocked, for example, and this can also be detected, and the detected pressure increases when the exhaust path side is blocked. Can detect not only one abnormality but also many abnormalities, and it is extremely easy to use.

  Next, the second embodiment shown in FIGS. 3 and 4 will be described. The same parts as those of the previous embodiment are denoted by the same reference numerals, and only the different parts will be described. An air supply pressure sensor 16 that detects the supply air pressure, an exhaust pressure sensor 17 that is provided in the exhaust pipe 12 and detects the exhaust pressure, and a pressure comparison circuit 18 that detects a pressure difference between the pressure sensors 16 and 17. It is composed of

  As a result, even if combustion gas leaks from either the air supply path side or the exhaust path side, the pressure detection balance by the supply air pressure sensor 16 and the exhaust pressure sensor 17 changes from the normal time, thereby comparing the pressure. The circuit 18 detects this, and the combustion control circuit 15 stops the combustion.

  By providing a pressure sensor for each of the air supply path and the exhaust path, it is possible to accurately detect the leakage of each path and use it with peace of mind.

  Next, the third embodiment shown in FIGS. 5 and 6 will be described. The same parts as those of the previous embodiment are denoted by the same reference numerals, and only the different parts will be described. In the case where a combustion gas leak occurs in the combustion appliance main body 10, the temperature sensor 19 detects a higher temperature than during normal combustion. The microcomputer 14 judges the combustion and stops the combustion to ensure safety, and can perform reliable control with an extremely simple configuration.

  Next, the fourth embodiment shown in FIGS. 7 and 8 will be described. The same parts as those of the previous embodiment are denoted by the same reference numerals, and only the different parts will be described. The CO sensor 20 is provided in the vicinity of the combustion burner 1. When a combustion gas leaks in the combustion appliance main body 10, the CO sensor 20 detects the CO, and the microcomputer 14 detects the combustion gas. Therefore, the combustion is stopped and the safety is ensured, and the CO is directly detected to extinguish the fire, so that it is extremely reliable and there is no fear of malfunction.

  Next, a fifth embodiment shown in FIG. 9 will be described. The same parts as those of the previous embodiment are denoted by the same reference numerals, and only the different parts will be described. If a leakage of combustion gas occurs in the combustion appliance main body 10, the load applied to the combustion fan 6 becomes lighter, so that the current value supplied to the combustion fan 6 is reduced. The microcomputer 14 judges the change and stops the combustion. Only by changing the software of the microcomputer 14, there is no need for a special part, and it can be detected easily while being implemented very easily.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing of the combustion apparatus which shows one Embodiment of this invention. The block diagram of the principal part electric circuit. The schematic explanatory drawing of the combustion apparatus which shows 2nd Embodiment. The block diagram of the principal part electric circuit. The schematic explanatory drawing of the combustion apparatus which shows 3rd Embodiment. The block diagram of the principal part electric circuit. The schematic explanatory drawing of the combustion apparatus which shows 4th Embodiment. The block diagram of the principal part electric circuit. The block diagram of the principal part electric circuit which shows 5th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustion burner 3 Wall 4 Supply / exhaust pipe 5 Supply pipe 6 Combustion fan 8 Heat exchanger 9 Convection fan 10 Combustion instrument body 12 Exhaust pipe 13 Leak detection means (pressure sensor)
14 microcomputer 15 combustion control circuit 16 air supply pressure sensor 17 exhaust pressure sensor 18 pressure comparison circuit 19 temperature sensor 20 CO sensor 21 load detection circuit

Claims (6)

  A combustion fan that sucks combustion air from the outside through a supply / exhaust tube that penetrates the wall, a combustion burner that burns with the combustion air supplied from the combustion fan, and a combustion gas that is generated by the combustion of the combustion burner and a supply from a convection fan A combustion appliance body having a heat exchanger for exchanging heat with the indoor air to be heated, releasing the warm air after heat exchange into the room for heating, and supplying the combustion gas after heat exchange to the supply and exhaust cylinder Leakage detecting means for detecting leakage of combustion debris in the combustion appliance main body, the supply / exhaust tube, the supply pipe connecting the combustion appliance main body and the supply / exhaust cylinder, or the exhaust pipe A forced supply / exhaust type combustion apparatus characterized in that combustion is stopped when leakage of combustion gas is detected.   2. The forced supply / exhaust type combustion apparatus according to claim 1, wherein the leak detection means is constituted by a pressure sensor for detecting an exhaust pressure.   The leak detection means comprises an air supply pressure sensor that detects an air supply pressure, an exhaust pressure sensor that detects an exhaust pressure, and a pressure comparison circuit that detects a pressure difference between the two pressure sensors. The forced supply / exhaust type combustion apparatus according to claim 1.   2. The forced supply / exhaust type combustion apparatus according to claim 1, wherein the leak detection means is constituted by a temperature sensor for detecting a temperature in the combustion appliance body or an exhaust temperature.   2. The forced supply / exhaust type combustion apparatus according to claim 1, wherein the leak detection means is constituted by a CO sensor provided in a combustion appliance main body.   2. The forced supply / exhaust type combustion apparatus according to claim 1, wherein the leakage detection means is constituted by a load detection circuit for detecting a load applied to the combustion fan.

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