JP6194597B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus, and more particularly to zero point correction of the sensor output of a CO concentration sensor in a combustion apparatus provided with a CO concentration sensor that detects the concentration of carbon monoxide contained in exhaust gas from a combustion section.

  Combustion devices such as gas heating and hot water supply devices have been proposed that include a CO concentration sensor that detects the concentration of carbon monoxide (CO) contained in the exhaust of the combustion section in order to ensure sufficient combustion performance. .

  As a CO concentration sensor provided in such a combustion apparatus, a catalytic combustion type CO concentration sensor obtained by coating a platinum coil with a catalyst such as aluminum oxide and drying and firing is generally used. Combustion-type CO concentration sensors have large variations, and it is desirable to perform zero point correction for correcting the zero point of the sensor output when the sensor is used. In the zero point correction, the sensor is heated up before the zero point correction is performed in order to eliminate the influence of humidity.

  Here, the required time for heat-up of the sensor is about 20 seconds, and during the heat-up and the zero point correction, the control unit of the combustion apparatus does not take in the sensor output of the CO concentration sensor. If the sensor is heated up and the sensor output is corrected to 0 point each time combustion is performed (the series of processes of heating up and correcting the zero point is hereinafter referred to as “zero point correction process”), the combustion is performed. Immediately after that, there is a problem that a time during which the carbon monoxide concentration cannot be measured occurs. In addition, in the configuration in which the zero point correction process is performed for each combustion, the frequency of heat-up of the CO concentration sensor increases, and the deterioration of the CO concentration sensor may be accelerated.

  For this reason, in a combustion apparatus equipped with such a CO concentration sensor, the zero point correction process of the CO concentration sensor is performed aiming at the timing at which combustion in the combustion section stops every certain time (for example, 24 hours). (For example, refer to Patent Document 1).

Japanese Patent No. 3706247

  However, such a conventional zero point correction method has the following problems, and improvement has been desired.

  That is, in a heating hot water supply apparatus having a function of supplying hot water for heating to a heating load (heating function), when the heating function is continuously used for a long time in a cold district or the like, the CO concentration is maintained even after the predetermined time has elapsed. There is a possibility that the sensor zero-point correction process may not be performed.

  Specifically, such a heating hot water supply device (combustion device) is provided with a heating combustion portion separately from the hot water combustion portion, and by heating the heating combustion portion, It is designed to produce hot water. And the warm water for heating produced | generated by the combustion of the combustion part for heating is supplied to a heating load (hot water heating apparatuses, such as a floor heating panel and a panel heater), and after returning heat to a heating load, it returns to a heating hot-water supply apparatus again. It comes to come. During use of the heating function, the heating combustor stops the combustion if the temperature of the heating hot water supplied to the heating load is higher than a predetermined upper limit temperature, and burns and heats if the temperature is lower than the predetermined lower limit temperature. It is controlled to heat up the hot water.

  For this reason, if the heating function is used continuously for a long time in cold regions, etc., the combustion part for heating may be in a flashing combustion state that repeats combustion and combustion stop (non-combustion) while using the heating function. If the non-combustion time in such flashing combustion is shorter than the time required for the zero point correction process of the CO concentration sensor, the combustion in the heating combustion section is restarted before the zero point correction of the CO concentration sensor is completed. The zero point correction process may be interrupted. As a result, there is a case where the zero point correction process of the CO concentration sensor is not performed even after the predetermined time (for example, 24 hours) elapses.

  The present invention has been made in view of such conventional problems, and the object of the present invention is to ensure that the zero-point correction processing of the CO concentration sensor is performed even when combustion in the combustion section continues for a long time. It is to provide a combustion device to be performed.

To achieve the above object, a combustion apparatus according to claim 1 of the present invention detects a heating combustion section for generating warm water for heating to be supplied to a heating load, and a carbon monoxide concentration in exhaust gas. A CO concentration sensor, heating return temperature detecting means for detecting the temperature of the heating hot water after heat radiation by the heating load, and a control unit that performs combustion control of the combustion unit. It comprises a control configuration for executing a zero point correction process for correcting the zero point of the sensor output, and the combustion unit for heating is provided at the outlet side of the hot water for heating after receiving a combustion request and starting combustion. A combustion apparatus that is controlled to stop combustion when the temperature is higher than a predetermined upper limit temperature and to restart combustion when the temperature is lower than a predetermined lower limit temperature , The control unit When the predetermined time has elapsed since the execution of the zero point correction process and the combustion of the combustion section for heating is stopped, the zero point correction process is executed and until the zero point correction process is completed, A control configuration for prohibiting combustion of the heating combustion section, and after the predetermined time has elapsed, the heating combustion section is burning without performing the zero point correction process, and the heating return When the temperature detected by the temperature detecting means is lower than the upper limit temperature and higher than a predetermined temperature set higher than the lower limit temperature, the combustion of the heating combustion section is stopped and the zero point correction is performed. And a control structure for prohibiting combustion of the heating combustion section until the zero point correction process is completed .

  In the combustion apparatus according to the first aspect, when the combustion of the combustion section for heating is stopped after a predetermined time has elapsed since the previous execution of the zero point correction process, the zero point correction process is executed at that time. Until the zero point correction process is completed, combustion of the combustion section for heating is prohibited. That is, the combustion section for heating maintains a non-combustion state. The zero point correction process is executed without interrupting the process. For this reason, in the combustion apparatus according to the first aspect, the zero-point correction process of the CO concentration sensor can be reliably performed even when the heating combustion section blinks and burns when the predetermined time has elapsed.

  Here, the zero point correction process means a series of processes including heat-up of the CO concentration sensor and subsequent correction of the zero point of the sensor output. The same applies hereinafter.

Further, in the combustion apparatus according to claim 1, when the predetermined time has elapsed and the zero point correction process is not performed and the heating combustion section is combusting, the heating return temperature detection is performed. On the condition that the temperature detected by the means is equal to or higher than a predetermined temperature, the combustion in the combustion section for heating is stopped and the zero point correction process is executed. And also in this case, until the zero point correction process is completed, the combustion part for heating is maintained in a non-combustion state, so that the zero point correction process is not interrupted by the combustion of the combustion part for heating, The zero point correction process is reliably executed. Therefore, in the combustion apparatus according to claim 1 , the zero-point correction process of the CO concentration sensor is reliably executed even when the combustion in the heating combustion section continues without interruption when the predetermined time has elapsed. Is done.

A combustion apparatus according to a second aspect of the present invention is the combustion apparatus according to the first aspect , wherein the control unit performs a second predetermined time longer than the predetermined time without executing the zero point correction process. If the heating combustion section is combusted when the time has elapsed, the combustion of the heating combustion section is stopped and the zero point correction process is executed, and until the zero point correction process is completed, It is characterized by having a control configuration for prohibiting combustion in the combustion section for heating.

In the combustion apparatus according to claim 2 , if the heating combustion section is combusted when the second predetermined time has elapsed without executing the zero point correction process, the combustion of the heating combustion section is stopped. Since the zero point correction process is executed, for example, when the combustion of the heating combustion section has continued without interruption from the elapse of the predetermined time until the second predetermined time elapses, Even when the heating return temperature is maintained below the predetermined temperature from when the predetermined time elapses until the second predetermined time elapses, the combustion for heating is performed after the second predetermined time elapses. The combustion of the part is stopped and the zero point correction process is executed. In this case as well, as in the combustion apparatus described in claim 1, the heating combustion section is maintained in a non-burning state until the zero point correction process is completed. The zero point correction process is reliably executed without interrupting the correction process.

A combustion apparatus according to a third aspect of the present invention is the combustion apparatus according to the first or second aspect , further comprising a hot water supply combustion section for generating hot water for supplying hot water to be supplied to the hot water tap. When the hot water supply hot water discharge request is received during the execution of the zero point correction process, the control unit is configured to stop the zero point correction process being performed and burn the hot water supply combustion unit. It is characterized by that.

In the combustion apparatus according to claim 3 , when the control unit receives a hot water supply request for hot water for hot water supply during execution of the zero point correction process, the zero point correction process being executed is stopped and the hot water supply combustion unit is combusted. Therefore, the hot water supply function is not limited by the execution of the zero point correction process. That is, in the combustion apparatus according to the third aspect , the zero-point correction process of the CO concentration sensor can be reliably performed without impairing the hot water supply function.

A combustion apparatus according to a fourth aspect of the present invention is the combustion apparatus according to any one of the first to third aspects, wherein hot water for a bathtub is reheated using heating hot water generated in the heating combustion section. The control unit is configured to perform the heating, and when the retreat request is received during the execution of the zero point correction process, the control unit stops the zero point correction process being performed and performs the heating A control structure for burning the combustion section is provided.

In the combustion apparatus according to claim 4 , when the control unit receives a request for reheating the hot water in the bathtub during the execution of the zero point correction process, the zero point correction process being performed is stopped and the combustion unit for heating is turned on. Since the combustion is performed, the bathing function is not limited by the execution of the zero point correction process. That is, in the combustion apparatus according to the fourth aspect , it is possible to reliably perform the zero point correction process of the CO concentration sensor without impairing the bathing function.

According to the combustion apparatus of the present invention (particularly, the combustion apparatus according to claim 1 or 2 ), after a predetermined time has elapsed since the previous execution of the zero point correction process, the combustion stop of the heating combustion section and the heating return temperature are performed. By satisfying a predetermined condition such as the temperature being equal to or higher than a predetermined temperature, the combustion of the heating combustor is prohibited and the zero point correction process of the CO concentration sensor is executed. Even in the environment in which it is used, the zero-point correction process of the CO concentration sensor can be performed regularly and reliably. Therefore, it is possible to provide a combustion apparatus in which the deterioration in combustion performance due to the shift of the sensor output of the CO concentration sensor is small.

Further, according to the combustion apparatus of the present invention (particularly, the combustion apparatus according to claim 3 or 4 ), the zero concentration correction process of the CO concentration sensor is periodically performed without impairing the hot water supply function or the bath retreat function. Therefore, it is possible to provide a combustion apparatus with less user dissatisfaction due to the deterioration of the hot water supply function and the bathing function.

It is a schematic block diagram which shows an example of the combustion apparatus which concerns on this invention. It is a flowchart which shows an example of the execution procedure of the 0 point correction process in the combustion apparatus. It is explanatory drawing of the specification which determines the priority when the zero point correction process and combustion request | requirement in the combustion apparatus compete. It is a flowchart which shows another example of the execution procedure of the 0 point correction process in the combustion apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1
FIG. 1 shows an example of a combustion apparatus according to the present invention. The combustion apparatus shown in FIG. 1 has a hot water supply function for supplying hot water to a hot water tap such as a curan and a hot water heating apparatus (heating load) such as a floor heating panel, a panel heater, and a hot water mist generator. The gas heating hot-water supply apparatus 1 provided with the heating function which supplies warm water, and the reheating function of the bath which replenishes the hot water in a bathtub is shown. Since the configuration of the gas heating and hot water supply apparatus 1 having the hot water supply function, the heating function, and the bathing function is well known, the detailed description thereof will be omitted here, and the description will be briefly made within the scope related to the present invention. The configuration will be described.

  This gas heating and hot water supply apparatus 1 includes a hot water supply hot water generating unit 2 that generates hot water for hot water supply, a hot water generating unit 3 for heating that generates hot water for heating and bathing, and each of these hot water generating units 2, 3 as a main part.

  The hot water supply hot water generation unit 2 is a hot water generation unit that generates hot water (hot water supply hot water) to be supplied to a hot water tap such as a currant, and includes a hot water supply burner (hot water supply combustion unit) 21 and a hot water supply burner. Hot water supply blower fan 22 that supplies combustion air to 21, hot water supply primary heat exchanger 23 that recovers heat from the combustion gas of hot water supply burner 21, and combustion after heat recovery by hot water supply primary heat exchanger 23 A hot water supply secondary heat exchanger 24 that recovers heat from gas (exhaust gas) is provided as a main part, and water introduced from a water source through the water intake pipe 6 is used as the secondary heat exchanger 24 for hot water supply and for hot water supply. The primary heat exchanger 23 sequentially heats and raises the temperature and supplies the hot water pipe 7 connected to the hot water tap. In FIG. 1, reference numeral 8 denotes a bypass pipe that connects the water inlet pipe 6 and the hot water outlet pipe 7, and the bypass pipe 8 is provided with a flow rate adjusting valve 9 that is controlled by the control unit 4.

  Here, the hot water supply burner 21 is composed of a gas burner using gas as fuel, and the combustion / combustion stop (non-combustion) and the combustion capacity are both controlled by the control unit 4. . Specifically, the hot water supply burner 21 opens the hot water tap, and detects water flow detection when a water flow sensor (not shown) provided in the water intake pipe 6 detects water flow of a predetermined flow rate or higher. The controller 4 receives a hot water supply hot water discharge request (combustion request of the hot water supply burner 21), ignites the hot water supply burner 21, and controls the combustion of the hot water supply burner 21. This combustion control is performed based on the incoming water flow rate and incoming water temperature of the incoming water pipe 6 and a hot water supply set temperature set by an operating device (remote control) of a gas heating hot water supply apparatus (not shown). That is, the control unit 4 adjusts the combustion capacity of the hot water supply burner 21 so that hot water at a hot water supply set temperature is discharged from the hot water discharge pipe 7 as combustion control of the hot water supply burner 21.

  On the other hand, the heating hot water generation unit 3 is a hot water generation unit that generates heating hot water to be supplied to a hot water heating apparatus (not shown), and includes a heating burner (heating combustion unit) 31 and a heating burner 31. A fan 32 for heating for supplying combustion air to the heater, a primary heat exchanger 33 for recovering heat from the combustion gas of the burner 31 for heating, and a combustion gas after heat recovery by the primary heat exchanger 33 for heating A heating secondary heat exchanger 34 that recovers heat from (exhaust gas) is provided as a main part.

  And in this embodiment, this warm water production | generation part 3 for heating needs warm water of comparatively high temperature (for example, about 80 degreeC) as warm water for heating like a panel heater, a warm water mist generator (mist sauna apparatus), etc. And a hot water heating apparatus (hereinafter referred to as “high temperature terminal”) and a hot water heating apparatus (hereinafter referred to as “high temperature terminal”) that requires relatively low temperature (for example, about 60 ° C.) hot water as heating hot water such as a floor heating panel. It is configured to be able to supply warm water for heating to both of them.

  That is, in the heating hot water generating unit 3, when the heating hot water is generated, the circulation pump 12 is operated to forcibly circulate the hot water between the hot water heating device and the heating hot water generating unit 3. Thereby, the hot water for heating (heated return hot water) after heat radiation at the high temperature terminal and the low temperature terminal is introduced into the secondary heat exchanger 34 for heating via the heating return pipe 10, and is heated by the secondary heat exchanger 34 for heating. After being warmed (preheated), it is introduced into the expansion tank 11. The low-temperature hot water in the expansion tank 11 is introduced into the heating primary heat exchanger 33, and further heated and heated in the heating primary heat exchanger 33 to generate high-temperature heating hot water. Hot water is supplied to the high temperature terminal via the high temperature heating forward pipe 13. On the other hand, the low temperature hot water in the expansion tank 11 is supplied to the low temperature terminal via the low temperature heating forward pipe 14. That is, the low temperature terminal is supplied with low temperature hot water before being heated and heated by the primary heat exchanger 33 for heating.

  Further, the heating burner 31 is constituted by a gas burner using gas as fuel, and the combustion / combustion stop (non-combustion) and the combustion ability are both controlled by the control unit 4. That is, the heating burner 31 is configured to start combustion when the control unit 4 receives a heating request (combustion request of the heating burner) from the hot water heating apparatus (or an operation device of the heating apparatus), After the start of combustion, this temperature is set to a predetermined upper limit temperature (for example, based on the temperature detected by the temperature sensor 18 provided in the high temperature heating forward pipe 13 (specifically, the hot water outlet of the heating primary heat exchanger 33). , 87 ° C.), the combustion is stopped, and when the temperature is lower than a predetermined lower limit temperature (for example, 70 ° C.), the combustion is restarted. In the present embodiment, a temperature sensor (heating return temperature detection means) 19 is also provided below the expansion tank 11, and the control unit 4 can detect the temperature of the heating return hot water using the temperature sensor 19. ing.

  In addition to the heating function, the heating hot water generator 3 of the present embodiment includes a liquid-liquid heat exchanger 41 in a pipe branched from the high-temperature heating forward pipe 13 as a configuration relating to the bathing function. It has been. On the secondary side of the liquid-liquid heat exchanger 41, a bath return pipe 42 for introducing hot water from the bathtub to the liquid-liquid heat exchanger 41, and hot water heated by the liquid-liquid heat exchanger 41 are led to the bathtub. The recirculation pipe 43 is connected, and a forced circulation pump 44 provided in the reflow pipe 42 is configured to forcibly circulate hot water with the bathtub. That is, when reheating hot water in the bathtub, the control unit 4 operates the circulation pump 44 to forcibly circulate hot water in the bathtub to the liquid-liquid heat exchanger 41 and burns the heating burner 31. Furthermore, by opening the retreat on-off valve 45 on the downstream side of the liquid-liquid heat exchanger 41, the reheating of the bath is performed using the high-temperature heating water supplied from the heating primary heat exchanger 33. To do. It should be noted that the combustion of the heating burner 31 associated with the reheating function of the bath is the reheating request (combustion of the heating burner 31) given from the operating device of the gas heating hot water supply apparatus 1 in the same manner as the setting of the hot water supply set temperature described above. The request is started when the control unit 4 receives the request.

  And each hot water production | generation part 2 and 3 for hot water supply and heating comprised in this way (specifically, the burners 21 and 31 of each hot water production | generation part 2 and 3, primary heat exchangers 23 and 33, and secondary The heat exchangers 24 and 34) are accommodated in a metal can 5 having an exhaust cylinder 5a that constitutes an exhaust passage for exhausting combustion gas (exhaust gas) to the outside (for example, outdoors). The exhaust cylinder 5a is provided with a CO concentration sensor 51 for detecting the carbon monoxide (CO) concentration in the exhaust. The CO concentration sensor 51 is a contact combustion type CO concentration sensor, and the control unit 4 heats up at a predetermined timing almost periodically and corrects the sensor output by 0 point (that is, 0 point). Correction processing) is performed (details will be described later).

  Reference numeral 15 denotes a drain recovery unit 15 for recovering acidic drain (condensed water) generated in the hot water supply and heating secondary heat exchangers 24 and 34. The drain recovery unit 15 is configured to receive and recover the drain falling from the secondary heat exchangers 24 and 34, and the drain recovered by the drain recovery unit 15 passes through the drain discharge pipe 16 to the middle. It is introduced into the sump 17 and discharged outside after neutralization.

  The control unit 4 is a control device that controls each part of the gas heating and hot water supply device 1, and performs various controls related to the hot water supply function, the heating function, and the bath retreat function based on a control signal given from an operation device (not shown). In addition, the zero-point correction process of the sensor output of the CO concentration sensor 51 is programmed to be executed according to the procedure described later.

  FIG. 2 is a flowchart showing the procedure of the zero point correction process of the CO concentration sensor 51. FIG. 3 is an explanatory diagram of the specification for determining the priority when the zero point correction process and the combustion request compete.

  In the gas heating and hot water supply apparatus 1 shown in the present embodiment, FIG. 3 shows specifications for determining which is prioritized when the zero point correction process of the CO concentration sensor 51 and the combustion request to the control unit 4 compete. Data is stored in the control unit 4.

  This specification is composed of a combination of an elapsed time from the previous zero point correction process and a combustion request source for the control unit 4. Specifically, in this embodiment, the elapsed time from the previous zero point correction process is “less than 24 hours”, “24 to 48 hours”, and “over 48 hours”. It is divided. Further, the combustion demand sources for the control unit 4 are classified into “hot water supply”, “reheating”, “high temperature mist sauna”, “low temperature hot dash”, “other”, and “no combustion demand”. ing.

  Here, the elapsed time from the previous zero point correction process is divided into three stages when the elapsed time from the completion of the previous zero point correction process becomes longer (for example, when it exceeds 48 hours). While it is highly necessary to perform the zero point correction process and the combustion performance may deteriorate if the zero point correction process is not performed, the elapsed time from the completion of the previous zero point correction process may be short (for example, The necessity of performing the zero point correction process is not high (if it is less than 24 hours), and the user's feeling of use may be impaired if the zero point correction process is performed, so that these are balanced specifications. is there. Therefore, this division is not limited to three stages, and can be set to two stages or four or more stages. The time zone to be divided is not limited to the setting example shown in FIG. 3 and can be changed as appropriate according to the structure and characteristics of the CO concentration sensor 51.

  On the other hand, the combustion request source may be classified into three categories of “hot water supply”, “heating”, and “reheating”. In this embodiment, “heating” is further classified into “high temperature mist sauna”. And “low temperature hot dash” and “others”. Here, "hot water supply" in this combustion request source means a hot water discharge request for hot water supply, and "refreshing" means a full renewal request. The “high temperature mist sauna” is a heating request from the hot water mist generating device which is a high temperature terminal (specifically, water supplied from the water or gas heating hot water supply device 1 to the hot water mist generating device 1). The hot water supplied from the hot water outlet pipe 7 is sprayed with the hot water heated by the liquid-liquid heat exchanger (not shown) between the hot water supplied from the high temperature heating forward pipe 13 of the gas heating hot water supply apparatus 1 and heated. "Heat dash associated with the operation to be performed"), "low temperature hot dash" is a heating request from the floor heating panel, which is a low temperature terminal, and particularly requires heating water for heating at a higher temperature than usual (operation of the floor heating panel) "Other" indicates heating requirements other than "High temperature mist sauna" and "Low temperature hot dash" (for example, high temperature) Heating requirement and from the panel heater is late, such heating demand of the normal operation of the floor heating panel) is meant.

  Of the heating requirements, “high temperature mist sauna” and “low temperature hot dash” are separated from “other” heating requirements. This is because the necessity of burning the heating burner 31 is higher than that of the other heating request (in other words, the discomfort given to the user by the combustion stop of the heating burner 31 is large). In other words, in the case of “other” heating requests, it may be possible to stop the combustion of the heating burner 31 and perform zero point correction processing, but in response to the heating request of “high temperature mist sauna” or “low temperature hot dash” When the combustion of the heating burner 31 is stopped, the user often feels dissatisfied immediately, and this is because the combustion can be prioritized over the zero point correction process. Therefore, even if it is a heating request other than the “high temperature mist sauna” and the “low temperature hot dash”, it is necessary to burn the heating burner 31. Similar to the “dash”, a different category from the “other” heating request may be provided. On the other hand, it is also possible to include a specific heating request in “other”, such as including “low temperature hot dash” in “other”. That is, these settings can be changed as appropriate.

  The “combustion priority” in FIG. 3 means control for burning the hot water supply burner 21 or the heating burner 31 in preference to the zero point correction process. The control unit 4 does not correct the zero point of the CO concentration sensor 51 when the hot water supply burner 21 or the heating burner 31 is burned based on the combustion request of “combustion priority”. When a combustion request with “combustion priority” is received during the execution of the zero point correction process, the control unit 4 stops (interrupts) the zero point correction process being executed, and the hot water supply burner according to the received combustion request. 21 or the heating burner 31 is burned.

  On the other hand, “0 point correction priority” means control that prioritizes the 0 point correction process unless the hot water supply burner 21 or the heating burner 31 is burned by “combustion priority”. . Therefore, when the control unit 4 receives a combustion request of “combustion priority” while executing the zero point correction process with “0 point correction priority”, the control unit 4 stops the received zero point correction process and accepts it. The hot water supply burner 21 or the heating burner 31 corresponding to the combustion demand is burned. As is clear from FIG. 3, in this embodiment, only “combustion priority” is set for the combustion requests of “hot water supply” and “reheating”, and for hot water supply based on the tapping request and reheating request. Combustion of the burner 21 or the heating burner 31 is always performed with priority over the zero point correction process. That is, the hot water supply function and the bathing function are not impaired by the zero point correction process. If there is no combustion request from any of “hot water supply”, “heating” and “reheating”, both the hot water supply burner 21 and the heating burner 31 have stopped combustion, and therefore “0 point correction priority” "

Next, returning to FIG. 2, an example of the procedure of the zero point correction process of the CO concentration sensor 51 will be described.
In the zero point correction processing procedure shown in FIG. 2, first, the control unit 4 determines whether or not a fixed time (4 hours in the illustrated example) has elapsed since the completion of the previous zero point correction (step S1 in FIG. 2). If this fixed time has elapsed, it is determined whether or not both the hot water supply burner 21 and the heating burner 31 have stopped combustion (is in a non-combustion state) (step S2 in FIG. 2). reference).

  And if judgment of this FIG.2 step S2 is negative (No in FIG.2 step S2), since at least any one of the hot water supply burner 21 and the heating burner 31 is burning, the control part 4 is It is determined whether combustion is performed only by the “other” combustion request (see step S3 in FIG. 2). If this determination is negative (No in step S3 in FIG. 2), the process returns to step S1 in FIG. In other words, regardless of whether or not 24 hours have passed since the previous zero point correction process, “hot water supply” other than “others”, “retreat”, “high temperature mist sauna” and “low temperature hot dash” are all Since “combustion priority” is set, the zero point correction process is not performed, and the process returns to step S1 in FIG.

  On the other hand, when the determination in step S3 in FIG. 2 is affirmative (Yes in step S3 in FIG. 2), the control unit 4 determines whether or not 24 hours have elapsed since the previous zero point correction process ( (See step S4 in FIG. 2). This is because the “other point” combustion request becomes “zero point correction priority” after 24 hours from the previous zero point correction process, as shown in FIG. If this determination is affirmative (Yes in step S4 in FIG. 2), the control unit 4 prohibits combustion based on the “other” combustion request, that is, stops the combustion of the heating burner 31 and Return to step S1 (see step S5 in FIG. 2).

  In this way, when the combustion of the heating burner 31 is prohibited and the process returns to step S1 in FIG. 2, the determinations in steps S1 and S2 in FIG. Then, it is determined whether or not 48 hours have elapsed since the previous zero point correction process (see step S6 in FIG. 2).

  If this determination is affirmative (Yes in step S6 in FIG. 2), the control unit 4 prohibits the combustion of the heating burner 31 based on the combustion requests of “high temperature mist sauna” and “low temperature hot dash”. (See step S7 in FIG. 2). That is, when 48 hours have elapsed from the previous zero point correction, the zero point correction process of the CO concentration sensor 51 is more necessary than the feeling of use of “high temperature mist sauna” and “low temperature hot dash”. (See FIG. 3), the controller 4 performs combustion based on the combustion demands of the “high temperature mist sauna” and the “low temperature hot dash” on the condition that 48 hours (predetermined time) have elapsed. Prohibit the combustion of the heating burner 31 for the “high temperature mist sauna” and “low temperature hot dash”.

  Here, in this embodiment, the prohibition of combustion based on the combustion request of the “high temperature mist sauna” and “low temperature hot dash” is such that if the heating burner 31 is in combustion at that time, this combustion is temporarily stopped. After that, combustion of the heating burner 31 thereafter is prohibited. That is, when the heating burner 31 is in combustion, if the combustion is stopped, the feeling of use of heating (particularly, the feeling of use of “high temperature mist sauna” and “low temperature hot dash”) is impaired. I'm trying not to get it.

  When the combustion based on the combustion request of “high temperature mist sauna” and “low temperature hot dash” is prohibited in this way, the control unit 4 starts the zero point correction process (see step S8 in FIG. 2). In this zero point correction process, as described above, the CO concentration sensor 51 is heated up and the zero point of the sensor output is corrected.

  Then, when the zero point correction process is completed (Yes in step S9 in FIG. 2), the control unit 4 initializes an elapsed time from the previous zero point correction process (see step S10 in FIG. 2). The combustion prohibition performed in S5 and S7 is canceled (see step S11 in FIG. 2). Thereby, after that, combustion of the heating burner 31 based on the combustion request of “other” and the combustion request of “high temperature mist sauna” or “low temperature hot dash” is permitted (allowed).

  Thus, in the gas heating hot water supply apparatus 1 shown in the present embodiment, the zero point correction process of the sensor output of the CO concentration sensor 51 is performed for a predetermined time (24 hours or 48 in this embodiment) from the previous execution of the zero point correction process. When the time has elapsed and the combustion of the heating burner 31 is stopped, the control unit 4 executes. Since the control unit 4 prohibits combustion of the heating burner 31 until the zero point correction process is completed, the zero point correction process can be performed during this period. Therefore, according to the gas heating hot water supply apparatus 1 shown in the present embodiment, the zero-point correction process of the CO concentration sensor 51 is reliably executed even if the heating burner 31 is blinking and burning when the predetermined time has elapsed. Can do.

Embodiment 2
Next, a second embodiment of the present invention will be described with reference to FIG.
The second embodiment is a modification of the implementation procedure of the zero point correction process of the CO concentration sensor 51 in the gas heating and hot water supply apparatus 1 of the first embodiment described above, and other configurations are the same as those of the first embodiment. . Therefore, parts having the same configuration are denoted by the same reference numerals and description thereof is omitted.

  In the gas heating hot water supply apparatus 1 shown in the second embodiment, the heating burner 31 is not executed after the predetermined time (for example, 48 hours) has elapsed since the previous execution of the zero point correction process. The present invention relates to the procedure of the zero point correction process when the fuel is burning.

FIG. 4 shows the procedure of the zero point correction process in this embodiment.
Steps S1 to S5 in the zero point correction processing procedure shown in FIG. 4 are the same as steps S1 to S5 in FIG.

  And in this embodiment, if the control part 4 prohibits the combustion of the heating burner 31 regarding the said "other" combustion request | requirement, it will transfer to FIG.4 step S6, and the control part 4 will be from the last 0 point correction process. It is determined whether or not the predetermined time (48 hours) has passed and the condition of “heating return temperature ≧ predetermined temperature” is satisfied (see step S6 in FIG. 4).

  Here, the condition that 48 hours have passed since the previous zero point correction processing is that, as in step S6 in FIG. 2, when the 48 hours have passed since the previous zero point correction, “high temperature mist sauna” and This is because the necessity of the zero point correction process of the CO concentration sensor 51 is higher than the feeling of use of “low temperature hot dash”, and the condition that “heating return temperature ≧ predetermined temperature” is a condition. In this case, even if the heating return hot water is not reheated by the heating primary heat exchanger 33 or the secondary heat exchanger 34 (in other words, the heating burner 31 is not burned), the “high temperature mist sauna” and This is because these can be used without greatly impairing the feeling of use of the “low temperature hot dash”. Therefore, the predetermined temperature is appropriately set so as to satisfy such a feeling of use. For example, the temperature is set to a value lower than the above-described upper limit temperature (for example, 87 ° C.) and higher than the above-described lower limit temperature (for example, 70 ° C.).

  When these conditions are satisfied in the determination of step S6 in FIG. 4, the control unit 4 performs heating based on the combustion request of “high temperature mist sauna” and “low temperature hot dash” as in step S7 of FIG. Combustion of the burner 31 is prohibited (see step S7 in FIG. 4).

  Here, in the present embodiment, the prohibition of combustion of the heating burner 31 based on the combustion requirements of the “high temperature mist sauna” and “low temperature hot dash” is performed even when the heating burner 31 is in combustion. The control unit 4 is configured to forcibly stop. That is, in the first embodiment described above, after the combustion of the heating burner 31 is stopped, the subsequent combustion of the heating burner 31 is prohibited, but then the combustion of the heating burner 31 continues. This is because the zero point correction process cannot be performed.

  Then, after the combustion of the heating burner 31 is stopped, the control unit 4 starts the zero point correction process (see step S8 in FIG. 4), and the zero point correction process is completed (Yes in step S9 in FIG. 4). Then, the elapsed time from the previous zero point correction process is initialized (see step S10 in FIG. 4), and the combustion inhibition performed in steps S5 and S7 in FIG. 4 is canceled (see step S11 in FIG. 4). It is the same as S8-11.

  Thus, in the gas heating hot water supply apparatus 1 shown in the present embodiment, in the zero point correction processing of the CO concentration sensor 51, the heating burner 31 is not executed even when the predetermined time elapses. If the combustion continues, the combustion of the heating burner 31 is stopped on the condition that the heating return temperature is equal to or higher than the predetermined temperature, and the zero point correction process is executed. Can be done.

Embodiment 3
Next, a third embodiment of the present invention will be described.
This third embodiment is obtained by further modifying the execution procedure of the zero point correction process of the CO concentration sensor 51 in the gas heating and hot water supply apparatus 1 shown in the first or second embodiment described above, and other configurations are the embodiments. 1 and common. Therefore, parts having the same configuration are denoted by the same reference numerals and description thereof is omitted.

  In the gas heating and hot water supply apparatus 1 shown in the third embodiment, the predetermined time (for example, 48 hours) has elapsed since the previous execution of the zero point correction process, and the predetermined time has not been executed. When a longer second predetermined time (for example, 168 hours) elapses, the control unit 4 is configured to stop the combustion of the heating burner 31 and execute the zero point correction process. Also in this embodiment, the control unit 4 prohibits combustion of the heating burner until the zero point correction process is completed.

  As described above, in the present embodiment, when the second predetermined time elapses without executing the zero point correction process, the control unit 4 forcibly stops the combustion of the heating burner 31 and executes the zero point correction process. When the combustion of the heating burner 31 continues without interruption or until the second predetermined time elapses after the predetermined time elapses, the heating return temperature is maintained below the predetermined temperature. Even in such a case, the zero point correction process can be executed.

  The above-described embodiments show preferred embodiments of the present invention, and the present invention is not limited to these, and various design changes can be made within the scope of the invention.

  For example, in the above-described embodiment, the case where the present invention is applied to the gas heating hot water supply apparatus 1 having the hot water supply function, the heating function, and the bathing function is shown, but the present invention is a combustion for heating. And a CO concentration sensor that detects the concentration of carbon monoxide in the exhaust, and a control unit that performs combustion control of the combustion unit, and the control unit includes a control configuration that executes zero-point correction processing of the CO concentration sensor If it is a combustion device, it can also be applied to a combustion device with a single heating function or a combustion device that does not have a bathing function.

  Further, in the above-described embodiment, the case where the CO concentration sensor 51 is provided inside the exhaust pipe 5 a is shown. However, the CO concentration sensor 51 can detect the concentration of carbon monoxide generated by the combustion of the burners 21 and 31. As long as the position is correct, it may be provided at an appropriate place other than the exhaust pipe 5a.

1 Gas heating hot water supply device (combustion device)
2 Hot water generator for hot water supply 3 Hot water generator for heating 4 Controller 6 Inlet pipe 7 Outlet pipe 10 Heating return pipe 11 Expansion tank 12 Circulation pump 13 for heating High temperature heating forward pipe 14 Low temperature heating forward pipe 15 Drain recovery section 16 Drain Discharge pipe 17 Neutralizer 21 Hot-water supply burner (combustion section for hot-water supply)
23 Primary heat exchanger for hot water supply 24 Secondary heat exchanger for hot water supply 31 Heating burner (combustion part for heating)
33 Heating primary heat exchanger 34 Heating secondary heat exchanger 19 Temperature sensor (heating return temperature detecting means)

Claims (4)

A combustion part for heating for generating hot water for heating supplied to the heating load, a CO concentration sensor for detecting the concentration of carbon monoxide in the exhaust, and a temperature of the warm water for heating after heat radiation by the heating load and heating return temperature detecting means together with a control unit that performs combustion control of the combustion section, and a control arrangement in which the control unit executes the zero-point correction process for correcting the zero point of the sensor output of the CO concentration sensor When the heating combustion section receives a combustion request and starts combustion, based on a detected value of a temperature sensor provided at a hot water outlet side of the heating hot water, the temperature is higher than a predetermined upper limit temperature. In a combustion apparatus controlled to stop combustion and to resume combustion when lower than a predetermined lower limit temperature ,
The controller is
When the predetermined time has elapsed since the previous execution of the zero point correction process and the combustion of the combustion section for heating has stopped, the zero point correction process is executed and until the zero point correction process is completed. A control configuration for prohibiting combustion of the combustion section for heating ;
After the predetermined time elapses, the heating combustion section is combusted without performing the zero point correction process, and the temperature detected by the heating return temperature detecting means is higher than the upper limit temperature. When the temperature is lower than a predetermined temperature set higher than the lower limit temperature, the combustion in the heating combustion section is stopped, the zero point correction process is executed, and the zero point correction process is completed. And a control system for prohibiting combustion of the combustion section for heating . The control unit is configured to perform the heating combustion unit if the heating combustion unit is combusted when a second predetermined time longer than the predetermined time has elapsed without performing the zero point correction process. And a control structure for prohibiting combustion of the heating combustion section until the zero point correction process is completed. The combustion apparatus according to 1 . A hot water supply combustion section for generating hot water for supplying hot water to the hot water tap;
When the control unit receives a hot water supply request for hot water for hot water supply during the execution of the zero point correction process, the control unit stops the zero point correction process being performed and burns the combustion unit for hot water supply. combustion apparatus according to claim 1 or 2, characterized in that it comprises. It is configured such that reheating of hot water in the bathtub is performed using hot water for heating generated in the heating combustion section,
The control unit has a control configuration in which when the reheating request is received during the execution of the zero point correction process, the zero point correction process being performed is stopped and the combustion unit for heating is burned. The combustion apparatus according to any one of claims 1 to 3 .

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