KR20010083107A - cumbustion system - Google Patents

Abstract

PURPOSE: A burner is provided to prevent the temperature of air fed to a combustion chamber from rising up excessively and to use an air feed/discharge path of an air feed/discharge pipe or the communicated inner space of a housing as a mounting place of various components. CONSTITUTION: A burner includes a feed air temperature sensor(17) for detecting the temperature of combustion air flowing into a combustion chamber(2) from an air feed path(11), and an overheat preventing unit for controlling the combustion rate of the combustion chamber if the temperature of air rises up higher than specific first overheating temperature. If the air temperature rises up over the first overheating temperature, the overheat preventing unit reduces the combustion rate of the combustion chamber. The temperature of exhaust gas from the combustion chamber falls. In a process of flowing air through the air feed path, the temperature of combustion air heat-exchanged with the exhaust gas is inhibited from rising up excessively. Thereby, the temperature of combustion air does not rise up excessively. In addition, the air feed path or an inner space of a housing is used for mounting a fan, an electronic circuit unit or resin components.

Description

Combustion system

The present invention relates to a combustion device such as a gas hot water supply device and a gas warm air heater.

In combustion apparatuses, such as a gas hot water heater and a gas warm air heater, what is called a FF type | formula is known conventionally. The FF type combustion apparatus includes a combustion chamber of a substantially closed structure accommodating a combustion section such as a burner in a housing of an apparatus main body installed indoors, and also supplies combustion air (air) to the combustion chamber outdoors. A supply and exhaust pipe formed in parallel with an air supply for introduction from the exhaust gas and an exhaust path for discharging the combustion exhaust gas from the combustion chamber to the outside is connected to the apparatus main body.

In this case, the air supply and exhaust pipe is generally used in the form of a double pipe structure by, for example, an inner tube forming an exhaust path therein, and an outer tube fitted to the inner tube to form an air supply path between the inner tube and the inner pipe. have.

In this kind of combustion apparatus, the combustion air that passes through the air supply line of the supply and exhaust pipe toward the combustion chamber is heated by heat exchange with a relatively high temperature exhaust gas that passes through the exhaust passage. In particular, when the supply / exhaust pipe becomes relatively long due to the installation site of the apparatus main body or the structure of the house, the supply air temperature of the combustion air is 70 to around the inlet portion of the combustion air from the air supply to the combustion chamber. It may rise to high temperature of 80 degreeC or more.

On the other hand, in this kind of combustion apparatus, a combustion fan for introduction thereof is usually formed near the air inlet portion for combustion from the air supply to the combustion chamber. In addition, in order to reduce the size of the apparatus main body, in the housing of the apparatus main body, an air supply portion that extends from the air supply line of the air supply / exhaust pipe to the air inlet of the combustion chamber (the inside of the housing of the device main body is the air supply portion as it is) The electronic circuit unit, the harness, the clamp member of the said harness, etc. are very often arrange | positioned in the location which communicates with it. In this way, the air for combustion introduced into the combustion chamber is brought into contact with the above various components, such as a combustion fan and an electronic circuit unit.

However, as described above, when the air supply temperature of the combustion air becomes high, lubricating oil of the rotating shaft of the combustion fan may leak, causing malfunction of the combustion fan or malfunction of the electronic circuit unit. There is a fear of causing problems such as deformation of the clamp member of the harness (this is generally a resin product).

In order to avoid such a problem, for example, a method of completely separating the air supply and the exhaust passage can be considered. However, in this case, since the air supply pipe and the exhaust pipe are separately required, the overall structure of the apparatus is also enlarged, and the processing of the air supply pipe and the exhaust pipe becomes difficult. In addition, since the air supply pipe and the exhaust pipe are formed separately, there is a problem that it is not preferable in appearance.

SUMMARY OF THE INVENTION The present invention has been made in view of such a background, and in a combustion apparatus having a supply and exhaust pipe formed side by side adjacent to an air supply and an exhaust path, the supply air temperature to the combustion chamber can be prevented from becoming excessively high. An object of the present invention is to provide a combustion apparatus which can use the air supply of the air supply / exhaust pipe and the internal space of the housing of the apparatus main body communicated with the air supply / exhaust pipe without any trouble as an installation place of various components.

BRIEF DESCRIPTION OF THE DRAWINGS The overall system block diagram of the gas hot water supply apparatus as one Embodiment with respect to the combustion apparatus of this invention.

FIG. 2 is a block diagram showing the configuration of main parts of the apparatus of FIG.

3 is a flow chart for explaining the operation of the apparatus of FIG.

FIG. 4 is a line graph for illustrating partial processing of the flowchart of FIG. 3. FIG.

(Explanation of symbols for the main parts in the figure)

2-combustion housing (combustion chamber) 3-gas burner (combustion section)

5-Water pipe (fluid passage) 6-Air supply and exhaust pipe

9-with exhaust 11-with air supply

17-Air supply temperature sensor 25-Heat exchanger

28-Quantity control valve (flow control means)

38-Supply temperature overheating prevention means

In order to achieve this object, the combustion apparatus of the present invention includes a combustion chamber accommodating a combustion unit for heating a heated object, an air supply and exhaust pipe communicating with the combustion chamber, and an exhaust path formed side by side adjacent to the inside thereof. The fuel is supplied to the combustion section while introducing combustion air into the combustion chamber through the air supply of the supply and exhaust pipe to perform the combustion operation of the combustion section, and exhaust gas generated by the combustion operation is discharged from the combustion chamber to the supply and exhaust pipe. A combustion apparatus for discharging through an exhaust path of an air supply, comprising: an air supply temperature sensor formed in the air supply path to detect a temperature of combustion air introduced into the combustion chamber from the air supply path, and an air supply temperature detected by the air supply temperature sensor Is increased so as to reduce the amount of combustion of the combustion section when the temperature rises above a predetermined first overheat temperature. In that it includes a supply air temperature overheat prevention means for controlling the amount it will be characterized.

According to the present invention, when the air supply temperature detected by the air supply temperature sensor rises above the first overheating temperature, the amount of combustion of the combustion section is reduced by the air supply temperature overheat prevention means, and thus is generated by the combustion operation of the combustion section. The temperature of the exhaust gas which falls becomes low. As a result, the excessive excess temperature of the combustion air heated by heat exchange with the exhaust gas in the process of circulating the air supply of the supply and exhaust pipe is suppressed. As a result, the supply air temperature of the combustion air can be prevented from becoming excessively high. Furthermore, the space inside the housing of the apparatus main body which communicates with the air supply of the said air supply / exhaust pipe, etc. can be used as a mounting place of a fan, an electronic circuit unit, a resin part, etc. without a problem.

In the present invention, the air supply temperature overheat prevention means, such that when the air supply temperature detected by the air supply temperature sensor is a temperature higher than the first overheating temperature, as the air supply temperature increases, the degree of reduction of the combustion amount of the combustion unit is increased. It is preferable to control the combustion amount in accordance with the air supply temperature.

By doing in this way, when the air supply temperature detected by the air supply temperature sensor rises above the first overheating temperature, the combustion amount of the combustion unit is greatly reduced as the air supply temperature is higher, so that the air supply temperature can be reliably prevented from being excessively increased. Can be. Also, The lower the air supply temperature is, the smaller the combustion reduction rate of the combustion unit is, so that the reduction in the combustion quantity of the combustion unit can be prevented by the necessary measurement.

In the present invention, the air supply temperature overheat prevention means increases the combustion amount when the air supply temperature detected by the air supply temperature sensor decreases toward the first superheat temperature after reducing the combustion amount of the combustion section.

Thereby, when the said air supply temperature becomes low, it can return to the original combustion amount of the said combustion part combustion amount.

In such a case, the air supply temperature overheat prevention means further increases the amount of combustion when the combustion amount of the combustion unit is decreased when the air supply temperature detected by the air supply temperature sensor is higher than or equal to the first overheat temperature. Slowly change the amount of combustion.

As a result, when the air supply temperature is lowered above the first overheating temperature, the combustion amount of the combustion unit increases relatively slowly, so that the temperature of the heated portion heated by the combustion operation of the combustion unit can be prevented from rising rapidly. . In addition, when the air supply temperature rises above the first superheat temperature, the combustion amount of the combustion section decreases relatively quickly, so that the continuous temperature rise of the air supply temperature can be prevented quickly.

In the combustion apparatus of the present invention, for example, the amount of combustion of the combustion unit for heating the fluid such that the temperature of the fluid is raised to a predetermined target temperature through the heat exchanger, using the fluid flowing through the fluid passage as the heated object. And a combustion control means for suppressing and a flow rate adjusting means for adjusting the flow rate of the fluid flowing through the fluid passage. As described above, in the combustion apparatus including the combustion control means and the flow rate adjusting means, when the flow rate of the fluid flowing through the fluid passage is reduced through the flow rate adjusting means, a combustion section necessary for raising the temperature of the fluid to the target temperature is provided. Since the combustion amount decreases, the actual combustion amount of the combustion section controlled by the combustion control means also decreases as a result. Conversely, increasing the flow rate of the fluid increases the combustion amount of the combustion section controlled by the combustion control means.

Thus, in the present invention, when the combustion device is a combustion device including a combustion control means and a flow rate adjusting means as described above, the air supply temperature overheat prevention means is such that the air supply temperature detected by the air supply temperature sensor is the first superheat temperature. When it rises above, the amount of combustion of the combustion part controlled by the said combustion control means is reduced by reducing the flow volume of the fluid which flows through the said fluid flow path through the said flow volume adjusting means.

Further, in the combustion apparatus including the combustion control means and the flow rate adjusting means, when the air supply temperature is a temperature equal to or greater than the first superheat temperature as described above, when the combustion amount of the combustion unit is increased as necessary, the air supply temperature The overheat preventing means controls the flow rate increase and decrease of the fluid flowing through the fluid passage through the flow rate adjusting means when the air supply temperature detected by the air supply temperature sensor is equal to or higher than the first superheat temperature. Control the amount of combustion of the combustion section being controlled.

Thus, by controlling the amount of combustion of the said combustion part in the case where the air supply temperature rises above the said 1st superheat temperature by the flow volume control of the said fluid, the said air supply temperature becomes excess, raising the temperature of a fluid to a desired target temperature. The high temperature can be prevented. As a result, excessive temperature rise of the air supply temperature can be appropriately prevented while satisfying the original function of the combustion apparatus.

As the combustion device including the combustion control means and the flow rate adjusting means as described above, for example, a hot water supply device in which the fluid to be heated by the combustion operation of the combustion unit is water, and a warm air heating device in which the fluid is air such as indoors. Can be.

In particular, in the case where the combustion device is a hot water supply device in which the fluid is water, and the combustion device that increases or decreases the amount of combustion of the combustion section when the air supply temperature is a temperature higher than the first superheat temperature, preferably, the air supply The temperature superheating means sets the target maximum combustion amount of the combustion unit to be lower as the air supply temperature is higher when the air supply temperature detected by the air supply temperature sensor is a temperature higher than or equal to the first superheat temperature. The combustion amount of the combustion section is controlled by controlling the quantity of water flowing through the fluid passage through the flow rate adjusting means such that the combustion amount of the combustion section controlled by the combustion unit is the target maximum combustion amount.

In this way, when the air supply temperature is a temperature equal to or greater than the first superheat temperature, the target maximum combustion amount of the combustion unit is set in accordance with the air supply temperature, and the quantity of water so that the combustion amount controlled by the combustion control means is the target maximum combustion amount. By controlling this, it is possible to minimize the decrease in the amount of water when the air supply temperature is a temperature above the first superheat temperature. Thereby, excessive temperature rise of the air supply temperature can be prevented while ensuring sufficient tapping amount (amount) of the hot water supply device.

Further, in the present invention, the air supply temperature overheat prevention means, when the air supply temperature detected by the air supply temperature sensor rises above a predetermined second overheating temperature to a temperature higher than the first overheating temperature, the combustion unit Means for stopping the combustion operation.

According to this, when the air supply temperature rises above the second overheating temperature, the combustion operation of the combustion section is automatically stopped, so that the excessive rise in the air supply temperature can be reliably prevented. Thereby, the damage of the apparatus and components installed in the said air supply and the place which communicates with this can be reliably prevented.

Embodiment of the Invention

One embodiment of the present invention will be described with reference to FIGS.

1 is a system configuration diagram schematically showing the configuration of a gas hot water supply device as a combustion device of the present embodiment, FIG. 2 is a block diagram showing the configuration of a main portion of the gas hot water supply device, and FIG. 3 is an operation of the gas hot water supply device. 4 is a line graph for explaining the partial processing of the flowchart of FIG. 3.

Referring to FIG. 1, the gas hot water supply apparatus according to the present embodiment includes a main body housing 1 installed indoors, a combustion housing 2 (combustion chamber) accommodated in the main body housing 1, and the combustion housing 2. To supply hot water (fluid) to the gas burner 3 (combustion part) accommodated in the lower part of the inside), a gas supply pipe 4 for supplying fuel gas to the gas burner 3, and a kitchen, a bathroom and a washroom. The water supply pipe 5 (fluid passage) and the combustion air (atmosphere) of the gas burner 3 are led to the combustion housing 2 from the outside, and the combustion housing is operated by the combustion operation of the gas burner 3. ) A supply / exhaust pipe (6) for directing the exhaust gas generated in the outside to the outside, a control unit (7) in charge of the operation control of the gas water heater, and a remote controller (8) connected to the control unit (7). ).

The air supply and exhaust pipe 6 has a space (lateral cross section) between the inner tube 10 that forms the exhaust passage 9 and the outer tube 10 which is substantially concentric with the inner tube 10. The annular space) is formed in a double tube structure having an exterior 12 which forms an air supply 11 for combustion air, and is continuously formed from the upper part of the indoor body housing 1 indoors to the outdoors.

The indoor end of the exterior 12 is connected to an opening 13 formed in the upper portion of the main body housing 1. As a result, the internal air supply passage 11 of the exterior 12 communicates with the interior of the main body housing 1 through the opening 13. In this case, in this embodiment, the main body housing 1 is formed in the substantially sealed structure, The inside (outside of the combustion housing 2) is the air supply 14 formed in the lower part of the combustion housing 2 It communicates with the inside of the combustion housing 2 via the combustion fan 15 (fan for supplying combustion air to the gas burner 3 in the combustion housing 2) formed in the location of the inside. Therefore, the air supply passage 11 communicates with the inside of the main body housing 1 and the inside of the combustion housing 2 through the combustion fan 15.

In addition, although the detailed illustration is abbreviate | omitted, the combustion fan is rotated in the main body housing 1 by rotating the rotating fan arrange | positioned facing the said air supply port 14 by an electric motor. It is supplying into).

In addition, the indoor end of the inner tube 10 is introduced into the main body housing 1 in the outer appearance 12 and is connected to an exhaust port 16 formed in the upper portion of the combustion housing 2. By this. The internal exhaust passage 9 of the inner tube 10 communicates with the inside of the combustion housing 2 through the exhaust port 16.

In addition, the outer end of the inner tube 10 and the outer tube 12 of the supply / exhaust pipe 6 is opened in the atmosphere.

In addition, an upper part of the main body housing 1 has an air supply temperature sensor that detects the temperature (air supply temperature) of the combustion air introduced into the combustion housing 2 from the air supply 11 through the interior of the main body housing 1 ( 17) is formed.

The gas supply pipe 4 is introduced into the combustion housing 2 through the interior of the body housing 1 from the outside of the body housing 1 and is connected to the gas burner 3. The gas supply pipe 4 is provided with a main solenoid valve 18, a gas proportional solenoid valve 19, and a negative solenoid valve 20 sequentially from the upstream side thereof.

The solenoid valve 18 and the solenoid valve 20 are solenoids not shown as solenoid valves for opening and closing the gas supply pipe 4 and supplying fuel to the gas burner 3 and blocking them. Open and close depending on whether or not electricity is supplied to the In addition, the gas proportional solenoid valve 19 is a solenoid valve for controlling the flow volume of the fuel gas supplied to the gas burner 3, and opens a valve by the opening degree according to the energization amount to the solenoid which is not shown in figure.

The water pipe 5 includes a water inlet pipe 21 introduced from the outside into the main body housing 1, a heat exchange engine 22 and a bypass pipe 23 branched at a downstream end of the water inlet pipe 21. The heat exchange engine 22 and the bypass pipe 23 are joined at their downstream end and are provided with a tapping tube 24 drawn from the main body housing 1. The downstream end of the tapping tube 24 is connected to an unshown hot water supply opening and closing device such as a kitchen, a bathroom, a washroom and the like.

In this case, the heat exchange engine 22 is piped via the heat exchanger 25 formed in the upper part of the combustion housing 2. As a result, the water flowing into the heat exchange engine 22 from the water inlet pipe 21 is heated through the heat exchanger 25 in the course of flowing the heat exchange engine 22 during the combustion operation of the gas burner 3. . The heated water joins the water flowing through the bypass pipe 23 without passing through the heat exchanger 25 and flows through the tapping pipe 24.

In this embodiment, the water inlet pipe 21 flows into the water inlet temperature sensor 26 which detects the temperature (water inlet temperature) of the water which flows through this, and the flow volume of the water which flows through the water inlet tube 21 (= hot water pipe 24). A water quantity control valve 28 (flow rate adjusting means) for controlling the flow rate of water is provided in order from the upstream side. The tapping tube 24 is also equipped with a tapping temperature sensor 29 that detects the temperature (tapping temperature) of the water flowing through the tapping tube.

In addition, the quantity control valve 28 adjusts the quantity of water by adjusting the opening degree of the valve body with the electric motor which is not shown in figure. Moreover, in this embodiment, the ratio of the flow volume of the said heat exchange engine 22 and the bypass pipe 23 is fixed.

In the combustion housing 2, a flame rod 30 for detecting a combustion flame of the gas burner 3 and an ignition electrode 31 for causing spark discharge upon ignition of the gas burner 3 are provided. Is equipped. In the main body housing 1, an igniter 32 for energizing the ignition electrode 31 is formed.

The remote controller 8 is installed outside the main body housing 1 in a kitchen or the like in order to set the target temperature of the tapping temperature (hereinafter referred to as the target tapping temperature) with respect to the control unit 7. It is connected to the control unit 7 arrange | positioned in the main body housing 1 via the communication line 33. As shown in FIG. The remote controller 8 includes a tapping temperature setting switch 34 for setting the target tapping temperature, an indicator 35 for displaying the target tapping temperature, an operation state of the hot water supplying device, and the like. It is.

The control unit 7 is an electronic circuit unit constructed using a microcomputer, and includes the main solenoid valve 18, the sub solenoid valve 20, the gas proportional solenoid valve 19, the combustion fan 15, and the quantity control valve. (28) The igniter 32 is responsible for the operation control of the entire apparatus including the combustion operation of the gas burner 3. As shown in FIG. 2, in order to perform the operation control, the control unit 7 transmits, for example, data of Mokpo hot water temperature through the communication line 33 from the remote controller 8. The detection signal of the water intake temperature sensor 26, the tapping temperature sensor 29, the flow rate sensor 27, the air supply temperature sensor 17, and the flame rod 30 is transmitted through a signal line (not shown).

In this case, the control unit 7 is a functional configuration which is the main use thereof, and the main solenoid valve 18, the sub solenoid valve 20, the gas proportional solenoid valve 19, the combustion fan 15, and the igniter 32. Through the combustion control means 36 for controlling the combustion operation of the gas burner 3 and the water quantity control valve 28 (more precisely the electric motor for driving the valve element of the water quantity control valve 28). The water quantity control means 37 which controls the quantity of water flow pipes 5 is provided. Although detailed processing of these combustion control means 36 and quantity control means 37 will be described later, the combustion control means 36 and quantity control means 37 are the air supply temperature overheat prevention means 38 according to the present invention. To construct.

In addition, although the detailed illustration is abbreviate | omitted, various sensors, such as the communication line 33 which connects the control unit 7 and the remote controller 8, the control unit 7, and the said intake temperature sensor 26, and the said main solenoid valve Harnesses such as signal lines for connecting actuators such as 18 are fixed to the main body housing 1 and the like by the resin clamp member or the like not shown in the main body housing 1.

Next, the operation of the gas hot water supply device of the present embodiment will be described together with a more detailed control process of the control unit 7.

In the gas hot water supply apparatus of the present embodiment, for example, when a user opens a hot water supply opening / closing device (not shown) such as a kitchen and starts water flow through the water pipe 5, it is controlled by a detection signal of the water flow sensor 27. The unit 7 detects it. Then, in accordance with this detection, the combustion control means 36 of the control unit 7 executes the ignition process of the gas burner 3.

In the ignition process, the combustion fan 15 is controlled to rotate at a predetermined rotational speed. At this time, the combustion air of a quantity corresponding to the rotation speed of the combustion fan 15 passes from the outside to the air supply 11 of the air supply and exhaust pipe 6 through the inside of the main body housing 2. Is supplied to the gas burner (3) via the air supply (14) of the combustion housing (2).

In parallel with the control of the combustion fan 15, the combustion control means 36 operates the igniter 32 to energize the ignition electrode 31 to cause spark discharge. In addition, the combustion control means 36 operates the combustion fan 15 and the ignition electrode 31 in this manner, and the main solenoid valve 18 and the sub solenoid valve of the gas supply pipe 4 to the gas burner 3. 20) to energize these valves to open. In addition, the gas proportional solenoid valve 19 is energized, the solenoid valve 19 is opened to a predetermined opening degree, and the gas supply pipe 4 supplies a predetermined amount of fuel gas to the gas burner 3. This ignites the gas burner 3.

When the gas burner 3 is ignited by this ignition process, it is detected by the detection signal of the flame rod 30. When this detection is made, the combustion control means 36 of the control unit 7 subsequently sets the tapping temperature detected by the tapping temperature sensor 29 by the tapping temperature setting switch 34 of the remote controller 8. A process of controlling the combustion amount of the gas burner 3 (hereinafter referred to as tapping temperature adjusting processing) is performed to match the target tapping temperature.

In the tapping temperature adjusting process, a gas burner (3) necessary for setting the tapping temperature to the target tapping temperature from the detection data of the tapping temperature sensor 29, the intake temperature sensor 26, the flow rate sensor 27, and the data of the tapping temperature. The required amount of combustion) is sequentially obtained using a predetermined data table or calculation formula. In addition, the inlet temperature can be estimated using the detection data of the tapping temperature sensor 29, the detection data of the flow rate sensor 27, the data of the combustion amount of the gas burner 3, and the like. (26) may be omitted.

The combustion control means 36 supplies the target rotational speed of the combustion fan 15 for supplying the gas burner 3 with the amount of combustion air corresponding to the required combustion amount obtained by the above-described method to a data table or the like not shown. It is decided according to. And the rotation speed of the combustion fan 15 is controlled according to the target rotation speed. In this case, in this embodiment, the combustion fan 15 is equipped with the rotation speed sensor which is not shown in figure which detects the rotation speed, and the actual rotation speed which the rotation speed sensor detected is the said target rotation. The rotation speed of the combustion fan 15 is feedback-controlled so that it may become a number.

Further, the combustion control means 36 determines the energization amount (opening degree) of the gas proportional solenoid valve 19 in accordance with the actual rotation speed of the combustion fan 15 detected by the rotation speed sensor, and determines the The gas proportional solenoid valve 19 is energized in accordance with the amount of energization. Thereby, the combustion air and fuel gas of the quantity corresponding to the said required combustion amount are supplied to the gas burner 3, and the combustion amount of the said gas burner 3 is controlled by the said required combustion amount. As a result, the combustion amount of the gas burner 3 is controlled to the combustion amount required to match the tapping temperature with the target tapping temperature. As a result, the tapping temperature is raised to the target tapping temperature or the temperature near the tapping temperature, and hot water at that temperature is supplied to a hot water supply opening and closing device (not shown) such as a kitchen.

Moreover, since the apparatus of this embodiment is a so-called fan preceding type, the energization amount of the gas proportional solenoid valve 19 is determined in accordance with the actual rotation speed of the combustion fan 15, but it is directly proportional to the said required combustion amount. The energization amount of the solenoid valve 19 may be determined.

In addition, when setting the target rotation speed of the combustion fan 15, the air supply temperature detected by the air supply temperature sensor 17 may be taken into consideration. That is, since the oxygen concentration in the combustion air decreases as the air supply temperature is higher, the amount of combustion air that can supply the oxygen amount corresponding to the required combustion amount of the gas burner 3 to the gas burner 3 increases. Therefore, for example, when the air supply temperature is higher than the standard temperature, the higher the air supply temperature, the higher the target rotational speed of the combustion fan 17 may be corrected.

On the other hand, while the tapping temperature adjusting process is performed by the combustion control means 36 as described above, the control unit 7 performs the air supply temperature detected by the air supply temperature sensor 17 (the combustion housing 2 at the air supply 11). Monitor the temperature of the combustion air introduced into the unit. And when the air supply temperature rises above predetermined 1st overheat temperature Ta (76 degreeC in this embodiment, for example), the process as shown by the flowchart of FIG. 3 (it mentions later for details) Is executed by the water quantity control means 37 at a predetermined control cycle (for example, one second cycle) to control the water quantity of the water pipe 5.

In addition, when the air supply temperature rises above the second overheat temperature Tc (for example, 80 ° C. in the present embodiment) higher than the first overheat temperature Ta, the gas burner is used by the combustion control means 36. The combustion operation of (3) is stopped. That is, the combustion control means 36 closes the main solenoid valve 18 and the sub solenoid valve 20 of the gas supply pipe 4 to block the supply of the combustion gas to the gas burner 3 to close the gas burner 3. Digest.

The second superheat temperature Tc is a malfunction of the control unit 7 in contact with the combustion air and in the main body housing 1, a malfunction of the combustion fan 15, a clamp member of the above-mentioned harness (not shown). Temperature near the upper limit temperature which does not cause problems such as thermal deformation.

Control of the quantity control means 37 of the air supply temperature detected by the air supply temperature sensor 17 when the air supply temperature rises above the first overheat temperature Ta (where air supply temperature <second superheat temperature Tc). The processing is performed as follows.

That is, referring to the flow chart of FIG. 3, the quantity control means 37 of the control unit 7 firstly sets the preset data as shown in FIG. 4 from the air supply temperature detected by the air supply temperature sensor 17. According to the table, the target maximum combustion amount of the gas burner 3 is calculated | required (STEP 1).

In this case, in the data table of FIG. 4, the air supply temperature is a predetermined temperature Tb that is equal to or greater than the first overheating temperature Ta and higher than the first overheating temperature Ta (in this embodiment, for example, 78 ° C. or less). The target maximum combustion amount is set so as to decrease linearly from the predetermined maximum value QmaxH toward the predetermined minimum value QmaxL as the supply air temperature rises. have. In addition, when the air supply temperature is equal to or greater than the combustion limit limit temperature Tb, the target maximum combustion amount is set to be kept constant at the minimum value QmaxL.

The maximum value QmaxH of the target maximum combustion amount is the maximum combustion amount of the gas burner 3 in the original maximum capacity (e.g., equivalent to No. 16) of the gas hot water supply device of the present embodiment (this is a heat exchanger). When the thermal efficiency of (25) is set to 0.8, for example, it is 2100 kJ / min (= 500 kcal / min). The minimum value QmaxL of the target maximum combustion amount is, for example, the maximum combustion amount of the gas burner 3 corresponding to No. 8 (this is 1050 kJ / min when the thermal efficiency of the heat exchanger 25 is 0.8). 250 kcal / min).

Thus, after calculating | requiring the target maximum combustion amount which matched the air supply temperature by the data table of FIG. 19 is calculated based on the current supply amount (this defines the flow rate of the fuel gas supplied to the gas burner 3) and the heat amount of the fuel gas (this is determined according to the type of combustion gas) (step 2). The actual combustion amount may be substituted for the required combustion amount calculated by the combustion control means 36 as described above.

Then, the obtained actual combustion amount (or current required combustion amount) is compared with the target maximum combustion amount (step 3).

At this time, in the case where the target maximum combustion amount <real combustion amount, the water quantity control means 37 determines that the required combustion amount that the combustion control means 36 obtains by the tapping temperature adjustment process is a small amount set in advance from the current actual combustion amount. The quantity of the water pipe 5 which becomes a value (= actual combustion amount-ΔQd) subtracted by the quantity ΔQd (for example, 4.2 kJ / min. It calculates | requires as a value (STEP4). In this case, the command value of the quantity is the value of the actual combustion amount-ΔQd and the tapping temperature sensor 29 by the inverse process in which the combustion control means 36 obtains the required combustion amount. And the detection data of the intake temperature sensor 26 and the data of the target tapping temperature. In this way, the command value of the amount of water obtained in STEP 4 is to reduce the required amount of combustion by the tapping temperature adjusting process by the unit reduction combustion amount ΔQd from the present, so that it is smaller than the present amount.

In addition, in STEP3, when the target maximum combustion amount> actual combustion amount, the water quantity control means 37 determines that the required combustion amount determined by the combustion control means 36 by the tapping temperature adjustment process is a small amount set in advance to the current actual combustion amount. The quantity of the water pipe 5 which becomes the value (= real combustion amount + ΔQu) which the quantity quantum | quantity (DELTA) Qu (for example, 0.14 kJ / min = ΔQd / 30 or less and unit incremental combustion amount (DELTA) Qu) is added, is the quantity of the said quantity. It calculates | requires as a command value (STEP5). In this case, the command value of the quantity is obtained from the actual combustion amount + ΔQu value, the detection data of the tapping temperature sensor 29 and the water intake temperature sensor 26 and the target tapping temperature data in the same manner as in step 4 above. In this way, since the command value of the quantity of water calculated | required in step 5 is for increasing the required combustion amount by tapping temperature adjustment process by the said unit incremental combustion amount (DELTA) Qu from the present, it becomes a value larger than the present quantity. In the present embodiment, as described above, the unit increase combustion amount ΔQu is smaller than the unit decrease combustion amount ΔQd.

In this way, after obtaining a command value of the quantity of water in the water pipe 5, the quantity control means 37 controls the opening degree of the quantity control valve 28 in accordance with the command value through an electric motor not shown. (STEP6) That is, the opening degree of the water quantity control valve 28 whose water quantity of the water supply pipe 5 detected by the said flow sensor 27 becomes the said command value is calculated | required by a predetermined data table, etc., and the quantity control valve 28 ).

In the case where the target maximum combustion amount = actual combustion amount in the above STEP 3, the processing of the above STEP 4 to STEP 6 is not carried out, so that the opening degree of the water quantity control valve 28 is maintained in the present state.

When the air supply temperature detected by the air supply temperature sensor 17 rises above the first overheating temperature Ta, the above-described processing is performed by the water quantity control means 37 at a predetermined control cycle (one second cycle). Is executed.

By such a process, the required combustion amount of the gas burner 3 calculated | required by the said combustion control means 36 so that the tapping temperature which the tapping temperature sensor 29 detects may become a target tapping temperature, and also the actual combustion amount are FIG. As shown in FIG. 1, the target maximum combustion amount is set in accordance with the air supply temperature. More specifically, in the state where the actual combustion amount is larger than the target maximum combustion amount adjusted to the air supply temperature, the water volume of the water pipe 5 gradually decreases, and as a result, the combustion amount of the gas burner 3 is changed every predetermined control cycle ( Every second) by the unit reduction combustion amount ΔQd. Further, in a state where the actual combustion amount is smaller than the target maximum combustion amount, the water flow rate of the water pipe 5 is gradually increased, and as a result, the combustion amount of the gas burner 3 is increased by the unit incremental combustion amount ΔQu for each control cycle. do.

In such a gas hot water supply device according to the present embodiment, the gas burner 3 at the maximum capability of the gas hot water supply device is basically a situation where the air supply temperature rises above the first superheat temperature Ta (76 ° C.). Is generated when the combustion operation of the gas burner 3 is carried out at the maximum combustion amount (the maximum value QmaxH of the target maximum combustion amount) or the combustion amount in the vicinity thereof. And until the air supply temperature rises from the first overheating temperature Ta to the combustion limit limiting temperature Tb, the target maximum combustion amount decreases as the air supply temperature rises as described above. For this reason, immediately after the air supply temperature rises above the first overheating temperature Ta, the amount of water passing through the water pipe 5 and the amount of combustion (real combustion amount) of the gas burner 3 decrease.

As the combustion amount of the gas burner 3 decreases, the temperature of the exhaust gas discharged from the combustion housing 2 to the exhaust path 9 of the supply and exhaust pipe 6 decreases. As a result, in the hot water supply passage 11, the temperature of the combustion air heated by heat exchange with the exhaust gas, that is, the air supply temperature is suppressed so as not to rise further, and basically it is soon lowered.

Thereby, the supply air temperature can be prevented from becoming excessively high, and furthermore, the control unit 7, the combustion fan 15, and the clamp member (not shown) of the harness that are in contact with the combustion air are excessive. It is possible to prevent the high temperature state.

In addition, when the air supply temperature is lowered due to the combustion reduction of the gas burner 3 as described above, since the target maximum combustion amount is increased in accordance with the data table of FIG. 4, the combustion amount of the gas burner 3 also increases. At this time, the combustion amount is increased by the unit incremental combustion amount [Delta] Qu every predetermined control cycle. In this case, the unit increase combustion amount ΔQu is smaller than the unit decrease combustion amount ΔQd when the combustion amount is decreased. For this reason, the combustion amount increases relatively slowly. As a result, it is possible to avoid the situation where the tapping temperature temporarily rises (<over shoot>) temporarily higher than the target tapping temperature. On the contrary, since the reduction of the combustion amount is carried out relatively quickly, the temperature of the air supply temperature is increased. It can be suppressed quickly.

In addition, since the amount of combustion of the gas burner 3 as described above when the air supply temperature is equal to or higher than the first superheat temperature Ta is made as a result of the increase and decrease of the water quantity of the water pipe 5, Control of the combustion amount of the gas burner 3 for preventing the temperature increase can be carried out while controlling the tapping temperature adjustment process, in other words, while controlling the tapping temperature to the target tapping temperature. For this reason, the temperature rising of the air supply temperature can be prevented, while satisfying the original function of the gas water supply device.

In addition, in a state where the air supply temperature is raised above the first overheating temperature Ta, the amount of combustion of the gas burner 3 is controlled to a target maximum combustion amount set in accordance with the air supply temperature. That is, the combustion operation of the gas burner 3 is performed with the largest possible combustion amount. For this reason, the reduction degree of the water quantity of the water flow pipe 5 for reducing the combustion amount of the gas burner 3 can be suppressed to the minimum. As a result, the amount of combustion of the gas burner 3 can be reduced and the excessive temperature rise of the air supply temperature can be prevented without restricting the amount of tapping water (= quantity of water pipes 5) more than necessary.

In addition, if the air supply temperature rises to the second superheat temperature Tc (80 ° C.), the combustion operation of the gas burner 3 is stopped (because the gas burner 3 is extinguished), and the supply air temperature continues. Since the rise is completely prevented, malfunction of the control unit 7, malfunction of the combustion fan 15, and the like can be reliably prevented.

In the above-described embodiment, the gas hot water supply apparatus has been described as an example, but the present invention can also be applied to an FF gas hot air heater having, for example, a gas supply and exhaust pipe having the same structure as the gas supply and exhaust pipe 6 above. . In this case, in the case of controlling the combustion amount of the gas burner in the combustion chamber so that the blowing temperature (room temperature) is the target temperature while blowing the warm air as a fluid from the main body housing to the room by a convection fan, for example, for combustion into the combustion chamber When the air supply temperature of air rises above a predetermined first superheat temperature, the amount of warm air blown by a convection fan or the like is reduced, resulting in a decrease in the combustion amount of the gas burner to lower the exhaust gas temperature and further reduce the supply temperature. It is possible.

Moreover, in the said embodiment, although the air supply and exhaust pipe 6 was comprised in the double pipe structure, if the air supply and exhaust pipe is provided adjacent to the air supply line and the exhaust path, it may be of another structure (for example, in a pipe body). And a diaphragm transverse to the radial direction to form an air supply passage and an exhaust passage having a semicircular cross section.

According to the present invention, the supply air temperature can be prevented from becoming excessively high, and furthermore, the control unit 7 in contact with the combustion air, the combustion fan 15, and the clamp member of the harness (not shown). Can be prevented from being in an excessively high temperature state.

Claims (8)

And a combustion chamber accommodating a combustion unit for heating the heated object, and an air supply pipe communicating with the combustion chamber and an exhaust path adjacent to the inside, the air supply exhaust pipe being formed in parallel with each other, and the combustion air passing through the air supply path of the air supply exhaust pipe to the combustion chamber. In the combustion apparatus for supplying fuel to the combustion unit while introducing the fuel to perform the combustion operation of the combustion unit, and exhaust the exhaust gas generated by the combustion operation from the combustion chamber through the exhaust passage of the supply and exhaust pipe, The air supply temperature sensor formed in the air supply to detect the temperature of the combustion air introduced into the combustion chamber from the air supply and the air supply temperature detected by the air supply temperature sensor rise above the predetermined first overheat temperature. And an air supply temperature overheat prevention means for controlling the combustion amount so as to reduce the combustion amount of the combustion section. The method according to claim 1, When the air supply temperature detected by the air supply temperature sensor is a temperature equal to or greater than the first overheat temperature, the air supply temperature overheat prevention means is adapted to the air supply temperature such that as the air supply temperature increases, the degree of reduction of the combustion amount of the combustion unit is increased. Combustion apparatus characterized in that for controlling the combustion amount. The method according to claim 1 or 2, And the air supply temperature overheat prevention means increases the amount of combustion when the air supply temperature detected by the air supply temperature sensor decreases toward the first superheat temperature after reducing the combustion amount of the combustion unit. The method according to claim 3, When the air supply temperature detected by the air supply temperature sensor is at a temperature equal to or greater than the first overheat temperature, the air supply temperature overheat prevention means slows down the combustion amount rather than reducing the combustion amount when the combustion amount is increased. Combustor characterized in that for changing. The method according to any one of claims 1 to 4, The combustion apparatus controls combustion of the combustion unit that heats the fluid through a heat exchanger so that the temperature of the fluid is raised to a predetermined target temperature by using the fluid flowing in the fluid passage as the heated object. Means and a flow rate adjusting means for adjusting the flow rate of the fluid flowing through the fluid passage, wherein the air supply temperature overheat prevention means has a supply air temperature detected by the air supply temperature sensor not lower than the first overheat temperature; And a combustion amount of the combustion section controlled by the combustion control means by decreasing the flow rate of the fluid flowing through the fluid passage through the flow rate adjusting means when raised. The method according to claim 3 or 4, The combustion apparatus comprises: combustion control means for controlling the combustion amount of the combustion section for heating the fluid through a heat exchanger so that the temperature of the fluid is raised to a predetermined target temperature by using the fluid flowing in the fluid passage as the heated object; A combustion apparatus comprising a flow rate adjusting means for adjusting a flow rate of a fluid flowing through the fluid passage, wherein when the air supply temperature detected by the air supply temperature sensor is a temperature higher than or equal to the first overheating temperature, the fluid flows through the flow rate adjusting means. And a combustion amount of the combustion section controlled by the combustion control means by controlling the flow rate of the fluid flowing through the passage. The method according to claim 6, The combustion device is a hot water supply device in which the fluid is water, and the air supply temperature overheat prevention means is configured to supply a target maximum combustion amount of the combustion unit when the air supply temperature detected by the air supply temperature sensor is a temperature higher than or equal to the first overheat temperature. The temperature is set to be lower as the temperature is higher, and by controlling the flow rate of the fluid passage through the flow rate adjusting means so that the combustion amount of the combustion section controlled by the control means is the target maximum combustion amount, thereby controlling the combustion amount of the combustion section. Combustion apparatus, characterized in that. The method according to any one of claims 1 to 7, The air supply temperature overheat prevention means includes means for stopping the combustion operation of the combustion unit when the air supply temperature detected by the air supply temperature sensor rises above a predetermined second overheat temperature set to a temperature higher than the first superheat temperature. Combustion apparatus comprising a.