JP4886802B2 - Combustion equipment, combustion control method thereof, exhaust system and combustion system - Google Patents

Description

The present invention relates to an exhaust control of the combustion equipment of the water heater and stove such as instant water heaters, in particular, combustion equipment for controlling the combustion in accordance with the exhaust temperature, about that combustion control method, exhaust system and combustion system .

When a plurality of combustion devices such as a hot water supply device such as an instantaneous water heater and a stove are installed in the kitchen, duct exhaust is used to release the exhaust of each combustion device to the outside air through a common duct. Regarding such duct exhaust and combustion equipment, a combustion equipment that stops combustion when the exhaust temperature rises above a threshold temperature (Patent Document 1), and when exhaust overflow occurs from the exhaust section, the determination is made. Based on this, there are an exhaust overflow safety device that stops combustion (Patent Document 2), an exhaust hood portion for a water heater (Patent Document 3) that simplifies the connection method to the duct passage, and the like.

JP 2000-205553 A JP 2003-302082 A JP 2002-349844 A

  By the way, as a duct direct connection type combustion device that is directly connected to a duct and exhausted, for example, in a hot water supply apparatus, the exhaust is discharged to a duct passage through an exhaust hood connected to the duct passage. The combustion apparatus disclosed in Patent Document 1 is provided with exhaust temperature detection means for detecting the exhaust temperature of the exhaust discharged from the exhaust hood into the duct passage, and outside air temperature detection means for detecting the ambient temperature of the water heater. When the exhaust gas temperature exceeds the threshold, combustion of the hot water supply device is stopped. Stopping the combustion according to the exhaust temperature is extremely preferable for safety, but some consumers feel that it is not practical to stop the combustion frequently.

  Further, in the exhaust overflow safety device disclosed in Patent Document 2, the temperature in the vicinity of the air suction port of the exhaust hood is monitored at regular time intervals, and if the detected temperature rise rate exceeds a predetermined value, the exhaust overflow is detected. Judgment is made and combustion of the water heater is stopped. In this case, since it is not possible to distinguish whether the detected temperature on the exhaust hood side is the ambient temperature or the temperature due to ignition of a heater such as a range, it is determined that the exhaust has overflowed, and there is a risk of shifting to shutdown.

  Moreover, since the exhaust temperature of the hot water supply apparatus reaches 200 [° C.] or more, it is necessary to install a large hood. If low temperature air in the room is mixed on the exhaust hood side, the exhaust temperature can be lowered, but there is a limit to the reduction in the exhaust temperature only by mixing the room air.

  In addition, when exhaust of combustion equipment having a high exhaust heat temperature such as a commercial kitchen room is exhausted through a duct passage, it is required to lower the exhaust temperature as a measure to prevent ignition of oil and fat accumulated in the duct passage.

  Regarding such a problem, there is no disclosure in the above-mentioned Patent Documents 1, 2, or 3, and there is no disclosure about means and ideas for solving it.

  Accordingly, an object of the present invention relates to exhaust of combustion equipment, and is to reduce exhaust temperature while maintaining combustion.

Another object of the present invention is to facilitate the heat-resistant design such as the degree of freedom in selecting a heat-resistant material for the exhaust system due to a decrease in the exhaust temperature.

  The configurations of the present invention for achieving the above object are listed as follows.

In order to achieve the above object, a first aspect of the present invention is a combustion device that uses a hood connected to a duct passage for exhaust, and combusts fuel to generate exhaust, an exhaust pipe, and an exhaust pipe. an exhaust top portion attached to an end of the cylinder, said forming an air flow path through which cold air in accordance with the exhaust between said chimney exhaust top, the hood the exhaust generated in the combustion portion an exhaust portion for guiding said installed in the exhaust pipe in the exhaust top portion detects the temperature of the exhaust gas by the temperature sensing portion facing the exhaust cylinder through the exhaust part, the low temperature of the rear section flows through the air passage It is a structure provided with the temperature sensor cooled with air, and the control part which controls the combustion capability of the said combustion part according to the said exhaust gas temperature. According to such a configuration, when the exhaust gas temperature is equal to or higher than a predetermined value, the exhaust gas temperature is decreased by maintaining the combustion by reducing the combustion capacity of the combustion unit, and when the exhaust gas temperature is decreased, The combustion capacity of the combustion section is increased, thereby increasing the temperature of the combustion exhaust. Thus, if the exhaust temperature is within a predetermined range, the exhaust temperature can be controlled without stopping combustion. Therefore, the above object can be achieved by such a configuration.

  In this combustion apparatus, the exhaust top portion may be configured to mix the exhaust gas and low-temperature air. Such a configuration can also achieve the above object.

In order to achieve the above object, a second aspect of the present invention is a combustion control method for a combustion device that uses a hood connected to a duct passage for exhaust, and an exhaust pipe that guides exhaust to the hood and the exhaust pipe. The low-temperature air flowing through the air flow path between the exhaust top portion attached to the end portion cools the back surface portion of the temperature sensor installed in the exhaust pipe in the exhaust top section, and the temperature facing the exhaust pipe wherein detecting the temperature of the exhaust gas flowing in the exhaust pipe at the temperature sensing portion of the sensor, which is configured to include a process for adjusting the combustion capacity of the combustion equipment according to the temperature of the exhaust. With such a configuration, the above object can be achieved.

Third aspect of the present invention for achieving the above object, an exhaust system of a combustion device for exhausting the duct passage, an exhaust pipe and an exhaust top portion attached to an end of the exhaust pipe, wherein wherein an exhaust tube to form an air flow passage through which cold air in accordance with the exhaust during the exhaust top, and an exhaust portion for guiding the exhaust, which is connected to the duct passage, sucks the exhaust gas directed to the exhaust portion A hood that guides the exhaust gas to the duct passage, and a temperature sensing part that is installed in the exhaust pipe in the exhaust top part, and that detects the temperature of the exhaust gas flowing through the exhaust part. The temperature sensor is cooled by low-temperature air flowing through the air flow path, and control means for controlling the combustion capacity of the combustion device according to the exhaust temperature of the exhaust section. With such a configuration, the above object can be achieved.

A fourth aspect of the present invention for achieving the above object is a combustion system comprising combustion means for combusting fuel to generate exhaust, an exhaust pipe, and an exhaust top part attached to an end of the exhaust pipe. An air passage through which low-temperature air flows according to exhaust gas is formed between the exhaust pipe and the exhaust top, an exhaust part that guides the exhaust gas, and a hood that sucks the exhaust gas guided to the exhaust part, A duct passage that guides the exhaust sucked into the hood to the outside air, and the exhaust pipe in the exhaust top part, and detects the temperature of the exhaust flowing through the exhaust part at a temperature sensing part facing the exhaust pipe, The back surface portion includes a temperature sensor that is cooled by low-temperature air flowing through the air flow path, and a control unit that controls the combustion capability of the combustion unit in accordance with the exhaust temperature of the exhaust unit. With such a configuration, the above object can be achieved .

  According to the present invention, the following effects can be obtained.

  (1) The exhaust temperature of combustion equipment can be lowered.

  (2) Since combustion can be maintained by lowering the exhaust gas temperature, for example, in a hot water supply device, hot water can be discharged at a desired temperature while reducing the amount of water.

  (3) Since the exhaust temperature can be lowered, fire prevention measures such as oil and fat can be reduced, low heat resistant materials can be used in the exhaust system, and the degree of freedom in selecting heat resistant materials is expanded. An exhaust part and a duct passage can be constituted.

  (4) If an exhaust top portion that mixes exhaust gas and low-temperature air is used, the exhaust gas can be mixed with low-temperature air to be cooled down and discharged to the duct passage.

(5) If the temperature sensor is provided in the exhaust top portion, the temperature sensor can be protected from an overheated state.

It is a figure which shows the exhaust system which concerns on the 1st Embodiment of this invention. It is a figure which shows the structural example of a hot-water supply apparatus. It is a figure which shows the structural example of an exhaust top part. It is a block diagram which shows the structural example of a hot water supply control apparatus. It is a figure which shows the structural example of an external remote control apparatus. It is a flowchart which shows exhaust gas temperature control. It is a figure which shows the structural example of the exhaust top part used for the exhaust system and hot water supply apparatus which concern on the 2nd Embodiment of this invention. It is a figure which shows the structural example of the exhaust system and hot water supply apparatus which concern on the 3rd Embodiment of this invention. It is a figure which shows the relationship between exhaust temperature and a real number. It is a figure which shows the relationship between exhaust temperature and flow volume. It is a figure which shows the relationship between a flow volume and preset temperature. It is a figure which shows the relationship between a real number and incoming water temperature.

[First Embodiment]

  A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an exhaust system for a combustion device according to a first embodiment.

  The exhaust system 2 includes a common duct passage 4 formed by a duct pipe or the like that is open to the outside air, and exhaust 6 generated from a plurality of combustion devices installed in a room such as a kitchen passes through the duct passage 4 described above. It is a system that discharges to the outside air. In this exhaust system 2, a duct passage 4 is installed on the ceiling of a kitchen or the like, and in this duct passage 4, a hood 8 for taking in exhaust 6 from combustion equipment is installed. The hood 8 has a skirt shape and includes an exhaust space 10 wider than the cross section of the duct passage 4. A connection passage 12 that connects the exhaust space 10 and the duct passage 4 is formed between the exhaust space 10 and the duct passage 4. In this embodiment, the single hood 8 is illustrated, but a configuration including a plurality of hoods may be used.

  In the duct passage 4, for example, a duct fan 14 is installed as a means for sucking the exhaust 6 from the exhaust space 10 of the hood 8 and releasing it to the outside air, and a motor 16 is connected to the duct fan 14 as a driving means. A power source 20 is connected to the motor 16 via a switch 18. The power source 20 is, for example, a commercial AC power source. When the switch 18 is turned on, the motor 16 is supplied with power and the duct fan 14 rotates. For example, a wind pressure sensor 22 is installed in the duct passage 4 as rotation detection means of the duct fan 14, and the wind pressure generated by the rotation of the duct fan 14 is detected by the wind pressure sensor 22, and an electrical signal is obtained as its detection output.

  In such an exhaust system 2, a hot water supply device 24 such as a semi-enclosed combustion type gas water heater and a stove 26 are installed as a plurality of combustion devices in the exhaust space 10 of the hood 8 or in the vicinity thereof. The hot water supply device 24 is a so-called instantaneous water heater.

  On the upper side of the hot water supply device 24, an exhaust pipe 28 is provided as an exhaust part for guiding the exhaust 6 generated in the equipment to the hood 8 side, and an exhaust top part 30 is provided at the end of the exhaust pipe 28. ing. In this embodiment, since the hot water supply device 24 is installed at a position away from the exhaust space 10, the exhaust tube 28 is connected to the exhaust tube portion 34 of the hot water supply device 24 so as to extend and bend, thereby The top portion 30 is installed in the hood 8 and the exhaust 6 is guided to the duct passage 4 side. In addition, a power source 20 is connected to the hot water supply device 24 via a power supply control unit 35, and the power supply control unit 35 performs power supply control of the hot water supply device 24 in accordance with a detection signal of the wind pressure sensor 22.

  In such a configuration, when the switch 18 is turned ON, the fan driving motor 16 that is supplied with power from the power source 20 is driven to rotate the duct fan 14. The wind pressure generated by the rotation is detected by the wind pressure sensor 22, and the detection signal is transmitted to the power supply control unit 35. The power supply control unit 35 determines whether the duct fan 14 is rotating according to the presence or absence or level of the detection signal. And the power supply to the hot water supply device 24 is performed based on the determination result. Since the combustion of the hot water supply device 24 is prohibited unless the duct fan 14 rotates, for example, in a semi-enclosed hot water supply device that takes in the air supply (air) necessary for combustion into the equipment from the room, the duct fan 14 is in the middle of combustion. Is stopped, combustion of the hot water supply device 24 is prohibited, and the exhaust 6 is prevented from leaking into a room such as a kitchen.

  The exhaust 6 of the hot water supply device 24 is discharged to the outside air through the duct passage 4, and the exhaust 6 of other combustion equipment such as the stove 26 is the same. By the way, in the hot water supply device 24, combustion means having a higher combustion capacity than that of the stove 26 or the like is used. Therefore, since the exhaust temperature is high, the exhaust temperature is detected, and the maximum combustion capacity is stepped according to the detected temperature. Thus, the exhaust temperature is controlled to a predetermined temperature or lower, for example, 65 [° C.] or lower. By reducing the exhaust temperature, a part or all of the exhaust part, the hood 8, the duct passage 4 and the like can be formed of synthetic resin, such as the exhaust cylinder 28 and the exhaust top part 30.

  Next, a hot water supply apparatus will be described with reference to FIG. FIG. 2 is a diagram illustrating a configuration example of the hot water supply device 24. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  The hot water supply device 24 is a heat source device such as a gas water heater for heating and supplying hot water W, and the hot water supply device 24 includes, for example, a primary heat exchanger 36 and a secondary heat exchanger as heat exchange means. 38 is provided. The primary heat exchanger 36 performs heat exchange mainly by sensible heat of the combustion exhaust 44 obtained by gas combustion of the burner 42 in the combustion chamber 41, and the secondary heat exchanger 38 heats mainly from the combustion exhaust 44 by latent heat. Exchange. Since the latent heat of the combustion exhaust is recovered using a heat exchanger or the like that recovers the latent heat of the combustion exhaust, the exhaust temperature can be easily lowered. The combustion exhaust 44 is high-temperature exhaust before heat exchange, whereas the exhaust 6 described above is low-temperature exhaust after heat exchange of the combustion exhaust 44.

  The clean water W supplied from the water supply port 46 exchanges heat in the secondary heat exchanger 38 through the water pipe 48 constituting the water supply channel, and then performs heat exchange in the primary heat exchanger 36 and from the hot water supply port 50. Hot water is supplied. On the water pipe 48 that constitutes the hot water supply path as well as the water supply path, an incoming water temperature sensor 52, an outgoing hot water temperature sensor 54, a mixed temperature sensor 56, a water amount sensor 58, a hot water supply valve 60, a water control valve 62 and a primary heat are provided. A bypass pipe 64 is provided across the exchanger 36, and a bypass water control valve 66 is provided in the bypass pipe 64.

  The incoming water temperature sensor 52 is a sensor that detects the temperature of the clean water W supplied from the water supply port 46, and the hot water temperature sensor 54 is a sensor that detects the water temperature after heat exchange is performed in the primary heat exchanger 36. The mixed temperature sensor 56 is a sensor that detects the water temperature immediately before hot water is supplied from the hot water supply port 50. These sensors 52, 54 and 56 are constituted by thermistors. Further, the water amount sensor 58 electrically detects the flow rate of the clean water W flowing through the water pipe 48 and outputs the detected flow rate as an electrical signal. The bypass pipe 64 is formed to increase the responsiveness to the set temperature of hot water, and the bypass flow rate is controlled by the bypass water control valve 66.

  The drain 68, which is the dew condensation water generated by the heat exchange of the secondary heat exchanger 38, is received by the drain receiver 69, and a drain passage 70 for draining the drain 68 of the drain receiver 69 to the outside of the hot water supply device 24 is provided. A neutralizer 72 for neutralizing the drain 68 is provided on the passage 70. The neutralizer 72 is provided with a neutralizing agent 74 and a partition wall 76 that prevents the unneutralized drain 68 from flowing out.

  As a combustion section that is a heat source of the hot water supply device 24, a burner 42 that burns fuel is installed in the combustion chamber 41, and a fuel gas G is supplied to the burner 42 through a gas supply pipe 78. The gas supply pipe 78 is provided with a fuel source valve 80, a fuel proportional valve 82, and fuel amount switching valves 84 and 86, and the fuel gas G is switched and adjusted. An ignition plug 88 for igniting the fuel gas G, an igniter 90, and a frame rod 92 for detecting a flame are provided. An air supply fan 94 that supplies air necessary for combustion to the burner 42 is provided at the bottom of the combustion chamber 41. Combustion exhaust 44 is obtained by combustion of the fuel gas G after obtaining this air supply. The combustion exhaust 44 is guided to the primary heat exchanger 36 and the secondary heat exchanger 38, and the exhaust 6 after the heat exchange is guided to the exhaust tube 28 side.

  For example, a CO sensor 96 is provided on the wall surface of the combustion chamber 41 as a means for detecting exhaust overflow, and detects the backflow of the exhaust 6 from the interior of the hot water supply device 24 or the duct passage 4 to a room such as a kitchen, Take out with electrical signal.

  An exhaust pipe 28 that guides the exhaust 6 to the duct passage 4 side is connected to the upper part of the combustion chamber 41, and an exhaust top portion 30 is attached to the end of the exhaust cylinder 28, so that the exhaust 6 and the low temperature air in the room And mixing. In the exhaust top portion 30, an exhaust temperature sensor 100 is installed in the exhaust cylinder 28 as a temperature sensor for directly detecting the temperature of the exhaust 6. The detection signal of the exhaust temperature sensor 100 is input to a hot water supply control device 102 as combustion control means for performing combustion control and the like. The hot water supply control apparatus 102 takes in detection signals from various sensors in addition to the detection signal from the exhaust temperature sensor 100, and performs various controls such as exhaust gas temperature control and combustion control in addition to hot water supply control. A leakage safety device 103 is installed at the power supply input section of the hot water supply control apparatus 102, and the power supply 20 is supplied with power through the power supply control section 35.

  In such a configuration, when hot water supply demand is generated by opening the hot water tap or the like, and combustion exhaust 44 is generated by combustion of the fuel G in the burner 42, the combustion exhaust 44 is converted into the primary heat exchanger 36 and the secondary heat exchanger. After sensible heat and latent heat are absorbed through 38, the exhaust 6 is led to the duct passage 4 from the exhaust pipe 28. The temperature of the exhaust 6 passing through the exhaust cylinder 28 is detected by an exhaust temperature sensor 100 installed in the exhaust cylinder 28, and the current maximum water supply amount set in the water control valve 62 is stepwise according to the detected temperature. In accordance with this, the current opening set in the fuel proportional valve 82 is increased or decreased step by step. That is, if the detected temperature of the exhaust 6 is equal to or higher than a predetermined temperature, the current maximum water supply amount set in the water control valve 62 is reduced stepwise, and the fuel proportional valve 82 is set correspondingly. By reducing the opening in stages, the amount of combustion is suppressed. Thereby, the exhaust gas temperature is controlled to a predetermined value or less.

  In the hot water supply operation, when water is supplied from the water supply port 46 and the water amount sensor 58 detects the flow of the water, the air supply fan 94 rotates, the fuel proportional valve 82 and the like are opened, and the burner 42 is ignited. Combustion starts. The clean water W is heated by heat exchange, and hot water HW having a set temperature is supplied from the hot water supply port 50.

  Next, the exhaust part will be described with reference to FIG. FIG. 3 is a diagram illustrating a configuration example of the exhaust top portion. 3, the same parts as those in FIG. 1 or 2 are denoted by the same reference numerals.

  A top portion outer cylinder 32 is installed on the exhaust top portion 30 so as to cover the end portion of the exhaust tube 28. The top outer cylinder 32 is larger in diameter than the exhaust cylinder 28 and is formed of a cylindrical body that is concentric with the exhaust cylinder 28, and is attached by support legs 104 erected on the outer surface of the exhaust cylinder 28. An air flow path 106 is formed between the top outer cylinder 32 and the exhaust cylinder 28. The support leg 104 is formed with an air passage 108 that opens the air flow path 106 into the room.

  An exhaust rectifying plate 110 is installed on the upper side of the top outer cylinder 32, and the exhaust rectifying plate 110 is attached to the inside of the top outer cylinder 32 by a stay 112. The exhaust rectifying plate 110 has a conical shape, and a tip portion of the exhaust rectifying plate 110 is inserted into the opening of the exhaust cylinder 28 to rectify the exhaust 6 from the exhaust cylinder 28 toward the wall surface side of the exhaust rectifying plate 110. An oil cover 116 is attached to the back side of the exhaust rectifying plate 110 via a stay 114, and the oil cover 116 covers the opening of the exhaust tube 28 together with the exhaust rectifying plate 110, and the oil and fat into the exhaust tube 28. The oil and fat falling through the air flow path 106 is received by a flange-like oil and fat receiving tray 117 fixed to the exhaust pipe 28 to prevent the oil and fat from dropping to the main body side of the hot water supply device 24. In the exhaust top portion 30, an exhaust temperature sensor 100 is installed in the exhaust cylinder 28, and only the temperature sensing portion 118 of the exhaust temperature sensor 100 is in contact with the exhaust 6.

  The exhaust 6 that has passed through the exhaust cylinder 28 generates an ascending air current on the air flow path 106 side, and is cooled by being mixed with low-temperature air flowing from the air flow path 106 in the top outer cylinder 32 according to the ascending air current. The temperature of the exhaust 6 is directly detected by the exhaust temperature sensor 100, and the detected temperature is transmitted to the hot water supply control device 102 of the hot water supply device 24 by an electric signal and used for the exhaust gas temperature control described above.

  According to such a configuration, the exhaust 6 is mixed with the indoor low temperature air to be cooled down and discharged to the duct passage 4, and the exhaust temperature sensor 100 detects the exhaust temperature. Since the back surface portion of the exhaust temperature sensor 100 is cooled by indoor low-temperature air, it is protected from an overheated state.

  Next, a control part is demonstrated with reference to FIG.4 and FIG.5. FIG. 4 is a block diagram showing a configuration example of the hot water supply control apparatus 102, and FIG. 5 is a block diagram showing a configuration example of the external remote control device 178. 4 and 5, the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals.

  A control arithmetic unit 120 is installed in the hot water supply control apparatus 102, and the control arithmetic unit 120 is configured by a computer. In this embodiment, a CPU (Central Processing Unit) 128 and a RAM (Random-) as a recording medium are provided. An access memory (130) and a read-only memory (ROM) 132 are provided. The ROM 132 stores various control programs such as a hot water supply control program, a combustion control program, and an exhaust temperature control program. The RAM 130 stores the detection results of each sensor installed in the hot water supply device 24.

  The control operation unit 120 is provided with a watch timer 134 for controlling various times, an input / output port unit 136 for various detection circuits, an interrupt control unit 138 for interrupt control, a program counter 140, and the like. The program counter 140 counts the execution timing of various control programs. The watch timer 134 counts the standby time when the combustion control, the hot water supply control, and the like are executed.

  The detection signal of the exhaust temperature sensor 100 is added to the temperature detection circuit 142, converted into a digital signal through the A / D converter 150, and then taken into the CPU 128. Similarly, the detection signals of the incoming water temperature sensor 52, the hot water temperature sensor 54, and the mixed temperature sensor 56 are similarly taken in through the temperature detection circuits 144, 146, and 148, converted into digital signals through the A / D converter 150, and then the CPU 128. Is taken in. Since the detection signal of the water amount sensor 58 is a pulse, it is shaped by the pulse waveform shaper 152, counted by the timer event counter 154, and the count output is taken into the CPU 128.

  The fan motor 156 that rotates the air supply fan 94 is driven by the output of the fan drive circuit 158 by a drive control signal output from the input / output port unit 136, and its rotation is detected by the fan rotation pulse detection circuit 160. The signal is counted by the timer event counter 154.

  The fuel proportional valve 82 is driven by the fuel proportional valve drive circuit 162 by the control signal output from the input / output port unit 136, the igniter 90 is driven by the igniter drive circuit 164, and the fuel source valve 80 is driven by the fuel source valve drive circuit 166. The fuel amount switching valves 84 and 86 are driven by the fuel amount switching valve driving circuit 168, and the water control valve 62 is driven by the water control valve driving circuit 170. The detection signal of the frame rod 92 is detected by the flame detection circuit 172, and the detection output is taken into the CPU 128 through the input / output port unit 136.

  The remote control signal output from the input / output port unit 136 is transmitted to the external remote control device 178 (FIG. 5) through the modulator 174 and the transmission circuit 176, and the control signal from the external remote control device 178 is received by the reception circuit 180 and the demodulator 182. Is taken into the interrupt control unit 138. The interrupt control unit 138 performs control of an interrupt command such as a set temperature change by a control signal from the external remote controller 178.

  A power supply 20 is supplied to the power supply unit 184 that supplies power to the control arithmetic unit 120 and other functional units through the power supply control unit 35 and the leakage safety device 103. That is, the power supply control unit 35 controls the power supply of the hot water supply control device 102.

  As shown in FIG. 5, the external remote controller 178 includes a control arithmetic unit 186, a receiving circuit 188, a demodulator 190, a modulator 192, a transmitting circuit 194, a temperature control switch 196, an operation switch 198, a display unit 200, A detection circuit 202, a drive circuit 204, and the like are installed. A CPU 206, a ROM 208, a RAM 210, an interrupt control unit 212, and input / output port units 214 and 216 are installed in the control calculation unit 186. An instruction to start or end the operation by the operation switch 198 is detected by the detection circuit 202, and the temperature adjustment by the temperature adjustment switch 196 is detected by the detection circuit 202, and the start, end or operation of the operation is executed.

  Next, the combustion control method will be described with reference to FIG. FIG. 6 is a flowchart showing an exhaust temperature control program as an example of the combustion control method.

  The control of the exhaust temperature is a control for reducing the exhaust temperature to a predetermined temperature or lower, for example, 65 [° C.] or lower while maintaining combustion based on the temperature detection of the exhaust 6. When the temperature is equal to or higher than the upper limit temperature H, for example, the combustion number is reduced stepwise as the maximum combustion capacity, and when the exhaust temperature reaches the lower limit temperature L, for example, the combustion number is stepped as the maximum combustion capacity. The hot water temperature is maintained at a preset temperature. In other words, when the exhaust temperature is equal to or higher than the upper limit temperature H, the amount of discharged hot water is limited. When the exhaust temperature reaches the lower limit temperature L, the amount of discharged hot water is increased and the discharged hot water temperature is maintained at the set temperature. The In this case, since the amount of tapping water and the fuel supply amount are in an interlocking relationship, the tapping amount may be adjusted, and the fuel supply amount may be adjusted. Moreover, since the amount of tapping water and the amount of water supply are the same, the number of combustion can be controlled by regulating or adjusting the opening degree of the water control valve 62.

Here, regarding the number representing the hot water supply capacity of the hot water supply device 1, 1 [number] is the ability to raise the temperature of 1 [L] water by 25 [° C.] per minute, and this is the capacity per hour. If described,
1 [No.] = 1 [L / min] × 1 [kcal / L · ° C.]
× 25 [° C] × 60 [min / h]
= 1,500 [kcal / h] (1)
Thus, the fuel amount and flow rate increase or decrease in proportion to the number.

  As is clear from Equation (1), the number is determined by the temperature difference between the incoming water temperature and the outgoing hot water temperature and the flow rate, and if the incoming water temperature and the outgoing hot water temperature are constant, the exhaust temperature depends on the number. Therefore, the number should be lowered to lower the exhaust temperature. In the hot water supply device 24, the combustion of the burner 42 is controlled so that the tapping temperature becomes the set temperature, and the combustion is controlled in accordance with the flow rate change to realize hot water supply at the set temperature. Decreasing the number of throttles the opening of the water control valve 62, that is, if the maximum regulated flow rate is reduced stepwise, the opening of the fuel proportional valve 82 is linked to this, and the maximum combustion capacity is reduced. It will be regulated. In other words, if the opening set in the fuel proportional valve 82 is throttled in stages, the opening of the water control valve 62 is throttled in stages in conjunction with this, the amount of hot water supplied is regulated, and the tapping temperature is Maintained constant. In this case, priority is given to maintaining the tapping temperature, but if the set temperature is adjusted to change the tapping temperature, the flow rate is maintained and the number changes.

  Therefore, in the flowchart, after the power is turned on, when hot water supply demand is generated by opening the hot water tap, combustion is started (step S1). In this case, the current number (maximum regulated flow rate, maximum combustion capacity regulation value) is reset and set to the maximum number as an initial setting. The start of combustion is conditional on the generation of a detection signal from the water amount sensor 58.

  Exhaust 6 is generated by the combustion, the exhaust temperature is continuously detected by the exhaust temperature sensor 100, and the detected temperature is taken into the control calculation unit 120 (step S2). It is determined whether or not the detected temperature is equal to or higher than the upper limit temperature H as a predetermined temperature as a threshold value, for example, whether or not it is 65 [° C.] or higher (step S3). If the detected temperature is equal to or higher than the upper limit temperature H (YES in step S3), for example, it is determined whether or not only one second has passed as the predetermined time T1 (step S4), and the regulated flow rate is decreased (step S5). ). The reason for setting the time T1 is to avoid an operation due to an instantaneous temperature rise or a detection error. Therefore, if the detected temperature does not continue above the upper limit temperature H for a predetermined time T1 (NO in step S4), the process returns to step S2 and temperature detection is performed again.

  For example, it is determined whether or not, for example, 2 seconds has elapsed as a predetermined time T2 from the start of the reduction of the regulated flow (step S6), and the process returns to step S2. In this embodiment, the predetermined time T2 is set because the temperature is continuously detected. Therefore, the predetermined time is required until the flow rate is regulated, or the exhaust temperature is set if the predetermined time has not elapsed since the flow rate regulation. This is because accurate temperature information is captured because the result does not occur.

  By the way, regarding the reduction of the regulated flow rate, for example, in the hot water supply device 24 having a maximum combustion capacity of 16 [No.], in the operation start state, the number for the regulated flow rate = the maximum number of equipment, and when it is increased by 25 [° C.]. The regulated flow rate is 16 [L / min]. When 1 [number] is subtracted from the number of the regulated flow rate, it becomes 15 [number], and the regulated flow rate for raising 25 [° C.] is 15 [L / min]. When the regulated flow rate is set to 16 [L / min] and the exhaust temperature exceeds the upper limit temperature H during use, the opening of the water control valve 62 is gradually reduced, and the regulated flow rate is decreased by 1 [number]. Let Therefore, the regulated flow rate of the hot water supply device 24 is reduced stepwise to 16 [L], 15 [L], 14 [L], and the hot water supply device 24 throttles the fuel proportional valve 82 while maintaining the hot water temperature accordingly. The combustion capacity is suppressed, and as a result, the exhaust temperature shifts to the upper limit temperature H or lower. In this case, the opening degree of the fuel proportional valve 82 may be reduced stepwise to directly reduce the maximum combustion capacity of the burner 42. As a result, the flow rate will be reduced if it is attempted to maintain the tapping temperature.

  For example, as described above, in addition to the case where the exhaust gas temperature is detected stepwise from 16 [L / min], the exhaust gas temperature is decreased from 16 [L / min] to 14 [L / min]. Also good. Further, the above flow rate controls the maximum number of the hot water supply device 24. For example, when the maximum number is 15 [L / min], the set temperature is lowered according to the use mode of the user, etc. Therefore, it is possible to perform hot water supply with a lower number.

  When the detected temperature of the exhaust 6 is lower than the upper limit temperature H (NO in step S3), it is determined whether the detected temperature is, for example, 60 [° C.] or less as the lower limit temperature L (step S7). When the detected temperature is equal to or lower than the lower limit temperature L, it is determined whether or not the lower limit temperature L continues for a predetermined time T3, for example, for only 2 seconds (step S8), and the predetermined time T3 elapses. In contrast to the above (YES in step S8), the restricted flow rate is increased (step S9), and the process proceeds to step S6.

  Even when the regulated flow rate is increased, after the elapse of time T2 in step S6 in order to confirm the change in the exhaust temperature after the control in the same manner as described above, the process proceeds to the temperature detection in step S2 again. For example, when the restriction flow rate is increased more than necessary, or when the user reduces the amount of hot water discharged or the set temperature while using the hot water supply device 24, the hot water discharge capacity can be increased again. .

  If the detected temperature has not reached the lower limit temperature L (NO in step S7), the process returns to step S2, the same temperature detection is continued, and the transition of the exhaust gas temperature is observed.

  By controlling the regulated flow rate described above, the exhaust temperature can be controlled between the upper limit temperature H and the lower limit temperature L. Since this exhaust temperature control is performed during combustion, for example, the exhaust temperature is set to 65 [° C.] or less. The exhaust system can be configured using a material having low heat resistance, such as a synthetic resin, for a part or all of the exhaust system.

  Note that the determination in step S4 does not detect the continuation of the state for a specific time as described above, but counts that the exhaust gas temperature exceeds the upper limit temperature H. It is good also as a structure which transfers.

[Second Embodiment]

  A second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram illustrating a configuration example of the exhaust top portion 30 of the hot water supply device 24. 7, the same parts as those in FIG. 3 are denoted by the same reference numerals.

  Also in the second embodiment, in the hot water supply device 24, the exhaust gas temperature control described above is executed, and the exhaust gas temperature is suppressed to 65 [° C.] or less, for example. In this embodiment, therefore, the exhaust top portion 30 is formed by forming the exhaust cylinder 28, the top outer cylinder 32, the exhaust rectifying plate 110, the oil cover 116, and the like from synthetic resin.

  Since the exhaust temperature is suppressed to 65 [° C.] or less, the exhaust 6 can be discharged also by such an exhaust top portion 30, and the processing cost can be reduced while reducing the weight of the exhaust tube 28 and the like.

[Third Embodiment]

  A third embodiment of the present invention will be described with reference to FIG. FIG. 8 is a diagram illustrating another configuration example of the exhaust system 2 and the hot water supply device 24. In FIG. 8, the same parts as those in FIG.

  In this embodiment, the exhaust pipe 28 that guides the exhaust 6 from the room 220 to the outside air is installed in the water heater 24 installed in the room 220. In this case, an exhaust cylinder 28 is installed in the exhaust cylinder part 34, and the exhaust temperature sensor 100 is installed in the exhaust cylinder part 34 or the exhaust cylinder 28 close to the exhaust cylinder part 34 to detect the exhaust temperature. The detected temperature is added to the hot water supply control device 102 of the hot water supply device 24, and combustion control and hot water supply control are performed.

  Thus, the present invention can also be applied to the exhaust extension type exhaust system 2, and the present invention is not limited to the duct passage 4. Since the exhaust temperature can be reduced to a predetermined temperature, for example, 65 [° C.], the exhaust cylinder 28 can be made of a synthetic resin or a material having a low heat resistance temperature. Further, since the temperature of the exhaust 6 that passes through the exhaust cylinder 28 is lowered, it is possible to reduce fire prevention measures and the like.

[Other Embodiments]

  Next, other embodiments will be listed and described.

  (1) In the above-described embodiment, the stove 26 is installed as a combustion device other than the hot water supply device 24. However, only the hot water supply device 24 may be installed, and two or more hot water supply devices 24 are installed. Also good. Moreover, the structure which installed the duct channel | path 4 for every combustion apparatus may be sufficient.

(2) In the above embodiment, the wind pressure sensor 22 is indirectly detect the driving of the duct fan 14 by the wind pressure may be a temperature sensor such as other detection means, as a direct detection detemir stage, duct A means for detecting the operating current of the fan 14 may be used.

  (3) In the first embodiment, the exhaust temperature sensor 100 for detecting the temperature of the exhaust 6 is installed in the exhaust cylinder 28 and the exhaust temperature is directly detected. 100 may be installed to detect the temperature of the exhaust 6 flowing in the duct passage 4.

  (4) In the above embodiment, the latent heat recovery type heat exchanger is used as the heat exchanger. However, only the primary heat exchanger 36 that mainly recovers sensible heat may be provided.

  (5) In the above embodiment, the power supply control unit 35 that performs power supply control to the hot water supply device 24 according to the confirmation of the drive of the duct fan 14 by the wind pressure sensor 22 is provided. It is good also as a structure which receives with the power supply part 184 installed in the apparatus 24, and performs the electric power feeding control to the hot water supply apparatus 24. FIG.

  (6) With regard to the combustion control described above, the lower limit temperature L set as the exhaust temperature may be variable depending on the detected temperature of the incoming water temperature sensor 52 or the outgoing hot water temperature sensor 54. As described above, the combustion exhaust 44 passes through the primary heat exchanger 36 and the secondary heat exchanger 38 and is discharged from the exhaust pipe 28 as exhaust 6. In the heat exchange of the secondary heat exchanger 38, the lower the incoming water temperature, the easier it is to absorb heat from the combustion exhaust 44, and the higher the incoming water temperature, the lower the heat absorption. Therefore, the temperature of the exhaust 6 depends on the incoming water temperature. Change. Therefore, if the combustion number is controlled with reference to the detected temperature of the incoming water temperature sensor 52, the exhaust temperature can be controlled to a predetermined temperature, for example, 65 [° C.] or less. Since the same relationship holds for the detected temperature of the hot water temperature sensor 54 with respect to such a change in the detected temperature of the incoming water temperature sensor 52, even if the combustion number is controlled according to the detected temperature of the hot water temperature sensor 54. The exhaust temperature can be controlled to a predetermined temperature, for example, 65 [° C.]. If the detected temperature of such an existing temperature sensor is used as the exhaust gas temperature in the control information, the exhaust gas temperature can be controlled without using the exhaust gas temperature sensor 100.

  (7) Regarding the increase / decrease of the number described above according to the exhaust temperature, the increase / decrease width of the number need not be constant, and the increase / decrease width may be changed. For example, when the exhaust temperature is 65 to 70 [° C.], the exhaust temperature is lowered by 1 [No.], and when the exhaust temperature is 70 to 75 [C], the exhaust temperature is lowered by 2 [No.]. In this case, the exhaust temperature can be reduced as quickly as possible.

〔Experimental result〕

  Next, the experimental results of the hot water supply apparatus according to the present invention will be described with reference to FIGS. 9, 10, 11, and 12.

  FIG. 9 shows the relationship between the exhaust gas temperature [° C.] and the actual number [number], where a is the incoming water temperature 5 ° C., b is the incoming water temperature 15 ° C., and c is the incoming water temperature 30 ° C. ]. From these characteristics, it can be seen that the exhaust gas temperature increases as the incoming water temperature increases.

  FIG. 10 shows the relationship between the exhaust temperature [° C.] and the flow rate [L / min] when the incoming water temperature is 15 [° C.] and the outgoing hot water temperature is 40.5 [° C.]. The flow rate is a hot water supply flow rate. When this flow rate increases, the exhaust gas temperature rises. When the flow rate exceeds 14 [L / min], it is understood that the reference temperature exceeds 65 [° C.].

  FIG. 11 shows the relationship between the flow rate [L / min] and the set temperature [° C.] at an exhaust temperature 65 [° C.], d is the incoming water temperature 7 [° C.], e is the incoming water temperature 15 [° C.], f Is the characteristic when the incoming water temperature is 20 [° C.] and g is the incoming water temperature is 30 [° C.]. From these characteristics, it can be seen that when the exhaust gas temperature is 65 [° C.] and the set temperature is constant, the flow rate increases as the incoming water temperature increases. In addition, if the flow rate is constant, it can be seen that the set temperature depends on the incoming water temperature.

  FIG. 12 shows the relationship between the actual number [No.] and the incoming water temperature [° C.] at an exhaust temperature of 65 [° C.]. From this characteristic, it can be seen that when the exhaust gas temperature is 65 [° C.], the actual number will be lower if the incoming water temperature is higher.

As described above, the most preferred embodiment and experimental results of the present invention have been described, but the present invention is not limited to the above-described embodiments and experimental results.

According to the present invention, regarding exhaust of a combustion device, it is possible to lower the exhaust temperature and maintain combustion, and to facilitate heat-resistant design such as freedom of heat-resistant material selection due to a decrease in exhaust temperature.

DESCRIPTION OF SYMBOLS 2 Exhaust system 4 Duct channel | path 14 Duct fan 24 Hot-water supply apparatus 28 Exhaust pipe 30 Exhaust top part 41 Combustion chamber 100 Exhaust temperature sensor 102 Hot-water supply control apparatus

Claims (5)

A combustion device using a hood connected to a duct passage for exhaust,
A combustion section that burns fuel and produces exhaust;
An exhaust pipe and an exhaust top part attached to an end of the exhaust pipe are provided, and an air flow path through which low-temperature air flows according to the exhaust gas is formed between the exhaust pipe and the exhaust top. An exhaust part for guiding the exhaust to a hood;
The temperature of the exhaust gas that flows through the exhaust unit is detected by a temperature-sensing unit that is installed in the exhaust tube in the exhaust top portion and faces the exhaust tube, and the back surface portion is cooled by low-temperature air that flows through the air flow path. A temperature sensor;
A control unit for controlling the combustion capacity of the combustion unit according to the exhaust temperature;
Combustion equipment characterized by comprising. The combustion device according to claim 1, wherein
The combustion exhaust device is characterized in that the exhaust top portion mixes the exhaust and low-temperature air. A combustion control method for a combustion device using a hood connected to a duct passage for exhaust,
Low temperature air flowing through an air flow path between an exhaust pipe that guides exhaust to the hood and an exhaust top part attached to an end of the exhaust pipe is installed on the exhaust pipe in the exhaust top part. And a process for detecting the temperature of the exhaust gas flowing through the exhaust pipe at a temperature sensing portion of the temperature sensor facing the exhaust pipe and adjusting the combustion capacity of the combustion device in accordance with the temperature of the exhaust gas. A combustion control method for a combustion device. An exhaust system for combustion equipment that exhausts into a duct passage,
An exhaust part that includes an exhaust pipe and an exhaust top part that is attached to an end of the exhaust pipe, and that forms an air flow path through which low-temperature air flows according to the exhaust gas between the exhaust pipe and the exhaust top, and guides the exhaust gas When,
A hood that is connected to the duct passage, sucks the exhaust led to the exhaust section, and guides the exhaust to the duct passage;
The temperature of the exhaust gas that flows through the exhaust unit is detected by a temperature-sensing unit that is installed in the exhaust tube in the exhaust top portion and faces the exhaust tube, and the back surface portion is cooled by low-temperature air that flows through the air flow path. A temperature sensor;
Control means for controlling the combustion capacity of the combustion device according to the exhaust temperature of the exhaust part;
An exhaust system comprising: Combustion means for burning fuel and generating exhaust;
An exhaust pipe and an exhaust top portion attached to an end of the exhaust pipe; and an exhaust section that guides the exhaust gas by forming an air passage through which low-temperature air flows according to exhaust gas between the exhaust pipe and the exhaust top. ,
A hood for sucking the exhaust gas guided to the exhaust unit;
A duct passage for guiding the exhaust sucked into the hood to outside air;
The temperature of the exhaust gas that flows through the exhaust unit is detected by a temperature-sensing unit that is installed in the exhaust tube in the exhaust top portion and faces the exhaust tube, and the back surface portion is cooled by low-temperature air that flows through the air flow path. A temperature sensor;
Control means for controlling the combustion capacity of the combustion means in accordance with the exhaust temperature of the exhaust part;
A combustion system comprising:

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