JP5741912B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus, and more particularly to an indoor installation type combustion apparatus for heating hot water or a heat medium for the purpose of hot water supply or heating.

2. Description of the Related Art Conventionally, an indoor installation type combustion apparatus that burns gas or liquid fuel is known as a heat source for a water heater or a heating device. This indoor-installed combustion device usually employs a forced air supply / exhaust type (so-called FF type) system. By driving the fan, air for combustion is forcibly supplied and generated by combustion. It is configured to forcibly exhaust the burned combustion gas outdoors. That is, this type of combustion apparatus is configured to include an exhaust duct (exhaust cylinder) and an air supply duct (supply cylinder) extending from the combustion apparatus main body installed indoors to the outdoors. Yes.
For example, Patent Literature 1 includes a single-pipe supply cylinder and an exhaust cylinder, and drives the fan to introduce outdoor air from the supply cylinder and exhaust combustion gas to the outdoors via the exhaust cylinder. A combustion apparatus is disclosed.

By the way, in this type of combustion apparatus, in an area or time when the outdoor temperature is low, the air passing through the supply cylinder may cool indoor air when the combustion operation is started. In particular, when the temperature difference between the outdoor and indoor is large, the low-temperature air passing through the supply cylinder cools the supply cylinder and the indoor air in contact with the combustion device surface excessively, so that the dew point temperature is reached. Generates water droplets (condensation phenomenon).
Also, water droplets due to condensation will continue to occur as long as the conditions that allow condensation to continue, so when using heating terminals such as floor heating equipment or fan convectors that are used continuously for a relatively long time, A large amount of water droplets are generated.

In this way, when the combustion apparatus is operated and the condition in which dew condensation occurs indoors continues for a long period of time, a large amount of water droplets are generated due to the low-temperature air passing through the supply cylinder. Water drops cannot be held mainly on the surface of the supply cylinder on the indoor side or the upper surface of the main body of the combustion apparatus, and the water drops may fall on the indoor floor surface or adhere to the indoor wall surface. As a result, there has been a problem that the building has a bad influence on the building by causing a stain or decay on the floor or wall of the building.
Therefore, conventionally, a heat insulating material is attached to the indoor supply cylinder or the combustion apparatus main body to reduce the influence of low-temperature air introduced from the outside and prevent the generation of water droplets.

JP 7-43015 A

  However, even when a heat insulating material is attached, dew condensation may occur on the surface of the heat insulating material (surface of glass wool, rock wool, etc.) (so-called internal condensation). There is a problem that causes deterioration. Furthermore, as a result, since the heat insulating effect by the heat insulating material is reduced, there is a problem that low temperature air passing through the supply cylinder is affected and water droplets are generated on the surface of the combustion apparatus.

Therefore, in addition to the heat insulating material, a moisture proof layer is provided on the indoor side to prevent the ingress of water vapor, and measures to suppress the deterioration of the heat insulating material by adopting a waterproof heat insulating material are considered, but it takes time to construct In addition, there was dissatisfaction that cost increased.
Moreover, since it takes time and effort to attach the heat insulating material, there is a demand for an operator to omit it.

  Therefore, an object of the present invention is to provide a combustion apparatus that can prevent the occurrence of condensation without increasing the labor and cost of construction.

In order to solve the above-mentioned problem, an invention according to claim 1 is directed to a heating unit that burns fuel to generate combustion gas, a fan, an air supply path that supplies air to the heating unit from outside, and a combustion It is an indoor-installed combustion device that has an exhaust path for discharging gas to the outside and circulates gas through the air supply path and the exhaust path by driving a fan, and the temperature of the air passing through the air supply path It is a combustion apparatus characterized by having temperature detecting means for detecting, and temporarily stopping the combustion operation on the condition that the temperature detecting means detects a temperature lower than a predetermined temperature.

  The combustion apparatus of the present invention has an air supply path for supplying outdoor air to the heating unit, and an exhaust path for discharging combustion gas generated in the heating unit to the outside, and driving the fan to supply the air This is an indoor-installed combustion apparatus that circulates gas in the exhaust path. And the temperature detection means which detects the temperature of the air supplied to a heating part is set as the structure which stops combustion operation | movement temporarily on the condition that the temperature lower than predetermined temperature was detected. In other words, when stopping the combustion operation, the temperature in the air supply path is lower than the predetermined temperature, and the temperature in the heating unit is excessively higher than the temperature in the air supply path.

  Here, for example, if the air supply path extends upward in the height direction with respect to the heating unit and there is no forced flow of gas due to the stop of the combustion operation, cold air is heavier than warm air Due to the nature, low-temperature air in the air supply path moves to the heating unit side. And by the movement of the low temperature air, the high temperature air on the heating unit side is pushed up to the air supply path side (so-called chimney effect).

That is, according to the present invention, the chimney effect is generated in the combustion device by stopping the combustion operation, and the thermal energy in the heating unit can be used for increasing the temperature in the air supply path. Thereby, even in a case where the temperature inside the air supply path becomes low and the temperature on the indoor side of the air supply path decreases, the temperature inside the air supply path can be raised by the chimney effect. The time during which the indoor side of the route is in a low temperature state can be shortened or almost eliminated. As a result, even if the conditions under which water vapor in the air can condense are prepared on the indoor side of the air supply path, the chimney effect can escape from the low temperature state at an early stage, so that a large amount of water droplets are caused by condensation. It does not occur. Thereby, according to this invention, a water droplet does not adhere to the floor surface and wall surface of a building from a combustion apparatus, and the malfunction which a stain of a water droplet is formed or a building decays cannot occur.
Further, in the present invention, as described above, by controlling the combustion operation, the chimney effect is caused and the dew condensation is suppressed, so that no special device is required in the construction, and the labor and cost of the construction are increased. Not invited.

  The invention according to claim 2 is characterized in that the combustion operation is temporarily stopped on condition that a predetermined time has elapsed since the detection temperature was detected to be lower than a predetermined temperature. It is a combustion device.

  According to such a configuration, the combustion operation is temporarily stopped when a certain time has elapsed since the temperature lower than the predetermined temperature is detected, so that the combustion operation is prevented from frequently stopping. Thereby, for example, when the combustion device is employed as a heat source unit that performs a heating function or the like, it is possible to prevent a problem that the amount of heat of hot water or the heat medium is insufficient and the heating effect is reduced.

Here, the heating operation using the heating terminal is often performed over a relatively long period (for example, 4 to 8 hours). Further, when heated hot water or a heat medium is circulated in the circulation circuit while being supplied to the heating terminal, heat energy is consumed in the heating terminal, but it does not reach an extremely low temperature in a short time. Therefore, during the heating operation, even if the combustion operation is temporarily stopped, there is a low possibility of occurrence of a problem that reduces the heating effect.
Therefore, in the combustion apparatus of the present invention, the heating unit heats hot water or a heat medium, and at least a hot water or a heat medium formed between the heating unit and an external heating terminal circulates. The part was arranged. (Claim 3)

  According to such a configuration, when performing the heating operation using the heating terminal, the combustion operation can be temporarily stopped, so that the effect expected by the present invention can be effectively exhibited.

  Invention of Claim 4 has a heat-medium temperature detection means to detect the temperature of the hot water or heat medium supplied to the said heating terminal, and the hot water or heat medium supplied to a heating terminal is the said heat-medium temperature. It is heated so that the detection temperature of the detection means approaches the target temperature, and at least when the condition for stopping the combustion operation is satisfied, the target temperature is temporarily changed upward. A combustion apparatus according to claim 3.

  Further, the invention according to claim 5 based on the same idea as claim 4 is provided in a heating unit that heats hot water or a heat medium supplied to a heating terminal when at least a condition for stopping the combustion operation is satisfied. The combustion apparatus according to claim 3, wherein the combustion amount is temporarily controlled to be higher than the current combustion amount.

  According to this configuration, when at least the condition for stopping the combustion operation is satisfied, the target temperature is temporarily changed upward (hereinafter referred to as the changed target temperature) or the combustion amount is temporarily increased. In addition, there is a low possibility of occurrence of a problem that the temperature of the hot water or the heat medium becomes excessively low after the combustion operation is stopped. As a result, in the combustion apparatus of the present invention, it is possible to prevent a situation in which a feeling of use such as a heating function using the combustion apparatus is impaired.

In the invention according to claim 6, after the target temperature is temporarily changed upward and the combustion operation is stopped, the heating medium temperature detecting means detects a temperature equal to or lower than the target temperature before the change. is the combustion apparatus according to claim 4, combustion operation when a predetermined time has elapsed since the stop, the combustion operation, characterized in that it is restarted.

The invention according to claim 7 based on the same idea as in claim 6 has hot-medium temperature detection means for detecting the temperature of hot water or heat medium supplied to the heating terminal, and hot water supplied to the heating terminal. Alternatively, the heat medium is heated so that the detected temperature of the heat medium temperature detecting means approaches the target temperature, and after the combustion amount is temporarily increased and the combustion operation is stopped, the heat medium temperature is increased. or detection means detects the target temperature below the temperature before the change, there have in claim 5, combustion operation when a predetermined time has elapsed since the stop, the combustion operation, characterized in that it is restarted It is a combustion device.

  According to such a configuration, since the combustion operation can be resumed based on a predetermined condition, the original function using the combustion device is not impaired due to temporarily stopping the combustion operation. That is, for example, when the combustion device has a function of heating hot water or a heat medium supplied to a heating terminal such as a floor heating device or a fan convector, the combustion operation can be restarted at an appropriate timing. In addition, there is no problem that the heating effect of the heating terminal becomes insufficient due to the lack of heat. Thereby, even if the combustion operation is temporarily stopped to prevent the occurrence of condensation, recombustion is performed at an appropriate timing, so that the feeling of use of the combustion device does not deteriorate.

  In the combustion apparatus of the present invention, the temperature of the air introduced into the heating unit from the outside is detected, and the combustion operation is temporarily stopped based on the detected temperature. Can be used effectively. Thereby, since the cooled air supply path | route can be heated up, the dew condensation phenomenon resulting from the low temperature air which passes an air supply path | route can be prevented. Further, in the present invention, since the condensation operation is prevented by controlling the combustion operation, the labor and cost in construction do not increase.

It is an operation principle figure which shows the combustion apparatus which concerns on embodiment of this invention. It is a flowchart which shows the operation | movement at the time of the heating operation of the combustion apparatus of FIG. It is the graph which showed notionally the time change of the detection temperature of the heating hot-water temperature sensor in the case of the heating operation of the combustion apparatus of FIG. 1, and the time change of the detection temperature of an outside temperature sensor. (When the temperature detected by the outside air temperature sensor is the predetermined temperature Tn) It is the graph which showed notionally the time change of the detection temperature of the heating hot-water temperature sensor in the case of the heating operation of the combustion apparatus of FIG. 1, and the time change of the detection temperature of an outside temperature sensor. (When the temperature detected by the outside air temperature sensor is the predetermined temperature Tm) It is a flowchart which shows the operation | movement at the time of the heating operation of the combustion apparatus which concerns on 2nd Embodiment. It is a flowchart which shows another operation | movement in the case of the heating operation of the combustion apparatus which concerns on 3rd Embodiment. It is the graph which showed notionally the time change of the detection temperature of the heating hot-water temperature sensor in the case of the heating operation of the combustion apparatus which concerns on 4th Embodiment, and the time change of the detection temperature of an external temperature sensor.

Hereinafter, a combustion apparatus 1 according to an embodiment of the present invention will be described.
The combustion apparatus 1 of this embodiment is an indoor installation type combustion apparatus, and includes two cans and a part of a piping system inside a housing 4. That is, as shown in FIG. 1, a hot water supply can 2 is arranged on the right side of the housing 4, and a heating equipment can 3 is arranged on the left side.
In addition, the combustion apparatus 1 of the present embodiment is configured such that an air supply cylinder 25 is attached to the upper portion of the housing 4 and air can be forcibly taken in from the outdoors by fans 9 and 10 described later. Further, in the present embodiment, the outside air temperature sensor 20 is provided on the proximal end side of the air supply cylinder 25, and the temperature of the outdoor air introduced into the housing 4 from the air supply cylinder 25 can be detected. It is said that.

  The hot water supply can 2 is roughly divided into a heating unit 5, a known fan 9 that blows air to the heating unit 5, a heat exchange unit 6 that exchanges heat between combustion gas generated in the heating unit 5 and hot water, and heat exchange. The exhaust pipe 26 is configured to discharge the combustion gas that has passed through the section 6 from the hot water supply can 2 to the outside. In the present embodiment, an exhaust header 37 is connected to the base end side of the exhaust cylinder 26, and the exhaust header 37 causes an upper part on the hot water supply can body 2 side and an upper part on the heating equipment can body 3 side to Are communicating. That is, the exhaust cylinder 26 is a portion where the combustion gas generated on the hot water supply can body 2 side and the combustion gas generated on the heating equipment can body 3 side can merge.

  On the other hand, the heating device can 3 is roughly divided into a heating unit 7, a known fan 10 that blows air to the heating unit 7, a combustion gas generated in the heating unit 7, hot water, a heat medium, and the like (hereinafter simply referred to as hot water and hot water). The heat exchanging part 8 for exchanging heat, and the exhaust cylinder 26 for discharging the combustion gas that has passed through the heat exchanging part 8 to the outside of the can 3 for heating equipment.

Here, as can be seen from FIG. 1, the hot water supply can body 2 and the heating equipment can body 3 have substantially the same configuration in the can body. The description of the configuration of the hot water supply can 2 is omitted.
The heating unit 7 in the heating device can 3 is composed of a burner 11 that burns gas fuel and a combustion space 12. And the solenoid valve 13 which can restrict | limit the supply of fuel with respect to the burner 11 is provided. The combustion space portion 12 is a space in which a flame is formed by combustion in the burner 11, and is also a portion where combustion gas generated by combustion is generated.
Although not shown, a gas proportional valve and an original gas solenoid valve are arranged outside the heating device can 3 and upstream of the solenoid valve 13 in the fuel flow direction.

  The heat exchange part 8 is a part where the heat exchanger 15 comprised by the pipe body which is located in the flow direction of a combustion gas from the combustion space part 12, and the hot water flows through is arranged. That is, in the heat exchange unit 8, high-temperature combustion gas flows from the combustion space 12 side, and the combustion gas and hot water flowing in the heat exchanger 15 exchange heat, and the hot water in the heat exchanger 15 is heated. Is done.

Then, each piping system of the hot water supply side and the heating equipment side is demonstrated. In addition, since each piping system of this embodiment is the same as that of well-known, it demonstrates easily.
First, the hot water supply side piping system will be described.
The hot water supply circuit 16 heats the inflow side channel 21 through which water flows from a water supply source (not shown), the outflow side channel 22 that is heated by the heat exchanger 6 and flows to a hot water tap (not shown), and the outflow side channel 22. It is comprised by the bypass flow path 23 which flows the front water. The inflow side channel 21 is provided with an incoming water temperature sensor 35 that detects the temperature of hot water introduced into the heat exchange unit 6, and the outflow side channel 22 has a high temperature heated by the heat exchange unit 6. A hot water temperature sensor 36 that detects the temperature of hot water mixed with hot water and low temperature hot water that has passed through the bypass flow path 23 is provided.
That is, the hot water supply circuit 16 mixes the hot water heated by the heat exchange unit 6 with the low temperature water supplied via the bypass channel 23 to adjust to a desired temperature, and supplies the hot water to the hot water tap or the like. Circuit.

Next, the heating-side piping system will be described.
The heating circuit 17 is formed between a heating terminal 24 such as a floor heating device (low temperature side heating device) and a fan convector (high temperature side heating device) disposed outside the combustion device 1 and the heat exchanger 15. It is a circulation circuit, and is composed of a high temperature side circuit 18 that flows through the high temperature side heating equipment and a low temperature side circuit 19 that flows through the low temperature side heating equipment.

More specifically, the heating circuit 17 includes a high-temperature forward flow path 27 for flowing high-temperature hot water heated by the heat exchange unit 8 to the high-temperature side heating device, and a low-temperature where heat energy is temporarily consumed by the heating terminal 24. Low-temperature forward flow path 28 for flowing hot water to the low-temperature side heating device, heating return flow path 29 for flowing hot water consumed by the heating terminal 24 to the heat exchange unit 8 again, and heating bypass for bypassing the heating terminal 24 A flow path 30 is used.
Further, in the middle of the heating return passage 29, the hot water passing through the bypass passage 30 and the low temperature hot water consuming the heat energy at the heating terminal 24 join together, and the hot water in the heating circuit 17. A circulation pump 32 is provided for circulating the gas. The expansion tank 31 is provided with a heating / hot water temperature sensor 34 for detecting the temperature of the hot water.

  That is, the high temperature side circuit 18 opens the hot water heated by the heat exchanger 15 on the condition that the thermal valve (not shown) of the high temperature side heating terminal is opened and the circulation pump 32 is driven. It is a circuit that is introduced into the high temperature side heating terminal via the high temperature going flow path 27 and flows again to the heat exchanger 15 via the heating return flow path 29. A part of the hot water flowing through the high-temperature going flow path 27 flows through the heating bypass flow path 30 and is introduced into the expansion tank 31 without going to the high-temperature side heating terminal.

Further, in the low temperature side circuit 19, hot water adjusted in temperature in the expansion tank 31 is cooled to a low temperature on the condition that a thermal valve (not shown) of the low temperature side heating terminal is opened and the circulation pump 32 is driven. This is a circuit that is introduced into the low temperature side heating terminal via the forward flow path 28 and flows again to the expansion tank 31 via the heating return flow path 29. In addition, in the expansion tank 31, the hot hot water heated with the heat exchanger 15 and the low temperature hot water which consumed the thermal energy with the low temperature side heating terminal are introduce | transduced.
In addition, in this embodiment, it has the control means 14 which controls operation | movement of the combustion apparatus 1 based on the information etc. which were obtained from each apparatus provided in the hot water supply circuit 16 and the heating circuit 17.

Next, the operation of the combustion apparatus 1 of the present embodiment will be described.
The combustion apparatus 1 according to the present embodiment includes a hot water supply operation for heating hot water flowing through the hot water supply circuit 16 and a heating operation for heating hot water flowing through the heating circuit 17, and is particularly characterized by an operation during the heating operation. For this reason, the following description will be given with a focus on heating operation.

First, in order to facilitate understanding, an outline of a general heating operation will be described using the operation principle diagram of FIG. In the following, as the heating operation, the operation of the floor heating device serving as the low temperature side heating terminal will be representatively described.
When an operation switch (not shown) of the floor heating device is turned on, the floor heating operation is started. That is, the fan 10 is driven and the heating operation of the heating unit 7 is started. At the same time, a thermal valve (not shown) disposed inside the floor heating device is opened, and the circulation pump 32 is driven to discharge hot water to the floor heating device side.

Here, in this type of combustion apparatus, during the heating operation, the temperature of the hot water discharged from the expansion tank 31 is controlled to approach a predetermined target temperature (for example, 60 degrees Celsius) Ts.
Specifically, the combustion amount in the heating unit 7 is proportionally controlled based on the temperature deviation Tc between the current hot water temperature Tn detected by the heating hot water temperature sensor 34 disposed in the expansion tank 31 and the target temperature Ts. Then, the temperature of the hot water in the expansion tank 31 is adjusted to the target temperature Ts. That is, the larger the temperature deviation Tc, the more the amount of combustion consumed by the heating terminal 24 is controlled to be output. The smaller the temperature deviation Tc, the more the amount of heat consumed by the heating terminal 24. Control is performed so that the combustion amount at the upper limit is output.

  The hot water adjusted in temperature by such control is introduced into the floor heating device via the low-temperature forward flow path 28, and the floor heating device is heated to a preset terminal-side set temperature To. Thereafter, the hot water whose amount of heat has been consumed in the floor heating appliance is again introduced into the expansion tank 31 via the heating return flow path 29, adjusted to the target temperature Ts, and discharged toward the floor heating appliance. This operation is continued as long as the operation switch of the floor heating device is kept on. The above-described heating operation is referred to as basic heating operation.

In the heating operation, the following operation is performed when a predetermined condition is satisfied during the basic heating operation.
That is, as described above, the hot water introduced into the expansion tank 31 is adjusted by adjusting the combustion amount proportionally based on the temperature deviation Tc, but the floor heating equipment is sufficiently heated, and the room is fully When warmed, the amount of heat consumed in the floor heating appliance is reduced. Finally, the amount of heat consumed in the floor heating device falls below the minimum combustion amount output in the heating unit 7, and the temperature of the hot water discharged from the expansion tank 31 may be equal to or higher than the target temperature Ts. At this time, if the temperature of the hot water discharged from the expansion tank 31 reaches a certain temperature or more, as an operation for adjusting the temperature in the proportional control, or as an operation for preventing the hot water from being abnormally hot and for the purpose of safety, The combustion operation is stopped.

That is, in the heating operation, if the temperature detected by the heating hot / cold water temperature sensor 34 is equal to or higher than a certain temperature, the combustion operation is performed for the purpose of temperature adjustment in proportional control or for the purpose of safety and the like to prevent abnormal hot water temperature. Stopped (intermittent operation of combustion operation). Further, in the intermittent operation of the combustion operation, the operation of the fan 10 is naturally stopped.
In general, the temperature at which the combustion operation is stopped is the temperature for the purpose of preventing the high temperature abnormality of the hot water (hereinafter, the high temperature abnormality temperature Th), the temperature for the purpose of the temperature adjustment in the proportional control (hereinafter, the high temperature side control). The temperature is set higher than the temperature Tj).

Further, during this intermittent operation, the circulation of hot water by the circulation pump 32 is continued, and the hot water circulates in the heating circuit 17. Then, when the amount of heat consumption in the floor heating device advances and the temperature detected by the heating hot / cold water temperature sensor 34 becomes equal to or lower than the target temperature Ts, the combustion operation is started again.
The above is the description of the normal heating operation during the heating operation of a general combustion apparatus.

In the present embodiment, the control flow for the operation of the general heating operation described above is configured such that control for temporarily stopping the combustion operation is added under conditions different from the above-described intermittent operation conditions on the combustion apparatus side. is there. That is, in the present embodiment, control for temporarily stopping the combustion operation is executed based on the temperature detected by the outside air temperature sensor 20.
Hereinafter, description will be made according to the flowchart of FIG. 2 and the graphs of FIGS.
In the following description, the temperature is 5 degrees Celsius and the room temperature is 25 degrees Celsius.

When an operation switch (not shown) of the floor heating device is turned on, a normal heating operation of the floor heating is started (step 1 in FIG. 2). The normal heating operation is the same as the general heating operation described above. That is, when attention is paid to the temperature of the hot water circulating in the heating circuit 17 during the normal heating operation, the detected temperature of the hot water temperature sensor 34 is the target as time passes, as shown in the upper graph of FIG. The temperature rises toward the temperature Ts and settles in the vicinity of the target temperature Ts.
On the other hand, paying attention to the temperature of the air passing through the air supply cylinder 25 at this time, the temperature detected by the outside air temperature sensor 20 decreases as time passes, as shown in the lower graph of FIG. It settles in the vicinity of a temperature (for example, 7 to 8 degrees Celsius) slightly higher than the temperature (5 degrees Celsius).

  By the way, as described above, in an indoor installation type combustion apparatus, if a temperature difference is formed between the low-temperature air passing through the air supply cylinder and the warm indoor air, the casing of the combustion apparatus is used. Water condensation may occur due to condensation on the indoor side of the body or air supply cylinder.

  Therefore, in this embodiment, in order to prevent dew condensation on the indoor side, the detected temperature of the outside air temperature sensor 20 is set to a predetermined temperature Tm (in this embodiment, 10 degrees Celsius) or a predetermined temperature Tn (in this embodiment, 0 degrees Celsius). As a reference, the following operation was performed. It should be noted that the predetermined temperature Tm and the predetermined temperature Tn may be adopted based on other temperatures as long as the condition of the predetermined temperature Tm> the predetermined temperature Tn is satisfied.

  That is, in step 2 of FIG. 2, first, it is confirmed whether or not the temperature detected by the outside air temperature sensor 20 is lower than a predetermined temperature Tn (0 degrees Celsius). Then, if the detected temperature of the outside air temperature sensor 20 is lower than the predetermined temperature Tn, the process proceeds to step 3, and a fixed time ts (this embodiment) after the detected temperature of the outside air temperature sensor 20 reaches a temperature lower than the predetermined temperature Tn. In this case, it is confirmed whether or not 1 hour has elapsed. On the other hand, if it is not confirmed in step 3 that the predetermined time has elapsed, the process returns to step 2 to check again whether or not the temperature detected by the outside air temperature sensor 20 is lower than the predetermined temperature Tn.

  In step 4, the target temperature Ts of hot water discharged from the expansion tank 31 is changed to a temperature higher than the target temperature Ts (hereinafter referred to as forced stop temperature Tv). The forced stop temperature Tv may be any temperature as long as it is higher than the target temperature Ts and not higher than the high temperature abnormal temperature Th. In step 4, if the target temperature Ts is changed to the forced stop temperature Tv, the heating unit 7 calculates the maximum combustion amount based on the temperature deviation Tc between the current hot water temperature Tn and the forced stop temperature Tv. Burned in. Thereby, as shown in the graph of FIG. 3, it heats up so that the detection temperature of the heating hot-water temperature sensor 34 may approach the forced stop temperature Tv. When the hot water temperature sensor 34 reaches the forced stop temperature Tv (step 5), the combustion operation is forcibly stopped (step 6). Thereby, the operation of the fan 10 is also stopped. At this time, as the post purge, the operation of the fan 10 is stopped after being performed for a certain period of time, but in this embodiment, it is shorter than the normal post purge time. For example, post-purge, which is normally performed for about 1 minute, is shortened to about 10 seconds. Note that the detected temperature of the outside air temperature sensor 20 from step 5 to step 6 is maintained at substantially the same temperature as that at step 5.

  In step 5, if the hot water temperature sensor 34 does not reach the forced stop temperature Tv even after a predetermined time has elapsed (step 11), the process is forcibly shifted to step 6. That is, in this embodiment, the combustion is stopped not only by the temperature of the hot water circulating through the heating circuit 17 but also by the passage of time. Thereby, not only the original heating function can be maintained, but also the dew condensation prevention function can be effectively exhibited.

  When the combustion operation is forcibly stopped in step 6, hot water circulates in the heating circuit 17 in that state, so that the amount of hot water is consumed at the heating terminal 24 as shown in the graph of FIG. The temperature of hot water drops. And it transfers to step 7 and returns to the target temperature Ts before changing the target temperature Ts of the hot water discharged from the expansion tank 31 into the forced stop temperature Tv. Thereafter, the process proceeds to step 8 where it is confirmed whether or not the temperature detected by the heating hot water temperature sensor 34 has reached the target temperature Ts or a temperature equal to or lower than the target temperature Ts. If it is confirmed in step 7 that the detected temperature has reached the target temperature Ts or a temperature equal to or lower than the target temperature Ts, the operation from step 1 is executed again.

  On the other hand, if the detected temperature of the outside air temperature sensor 20 is equal to or higher than the predetermined temperature Tn in step 2, the process proceeds to step 9. Then, in step 9, it is confirmed whether or not the detected temperature of the outside air temperature sensor 20 is lower than the predetermined temperature Tm. If the detected temperature is lower than the predetermined temperature Tm as shown in the graph of FIG. 10 In step 9, if the detected temperature is equal to or higher than the predetermined temperature Tm, the operation from step 1 is performed again.

In step 10, it is confirmed whether or not a predetermined time tl (2 hours in the present embodiment) has elapsed since the temperature detected by the outside air temperature sensor 20 reaches a temperature lower than a predetermined temperature Tm (10 degrees Celsius). If it is confirmed in step 10 that the predetermined time tl has elapsed, the process proceeds to step 4 and the operations after step 4 are executed. On the other hand, if it is not confirmed in step 10 that the predetermined time tl has elapsed, the operation from step 9 is performed again. In addition, when it transfers to step 4 through step 9, 10, the temporal change of the detected temperature of the outside temperature sensor 20 and the detected temperature of the heating hot-water temperature sensor 34 is as showing to the graph of FIG.
It should be noted that the fixed time ts and the fixed time tl, which are the time measured after the outside temperature sensor 20 in the present embodiment detects the predetermined temperature, may adopt other periods as long as the fixed time ts <the fixed time tl. I do not care.

  As described above, in the present embodiment, in the indoor combustion apparatus 1, the temperature of the air introduced from the air supply cylinder 25 is detected, and the combustion operation is forcibly stopped based on the detected temperature. it can. That is, since air from the outside is not forcibly introduced into the housing 4 of the combustion apparatus 1, a chimney effect is produced inside the housing 4. As a result, a temperature difference is formed between the outdoor low-temperature air and the indoor warm air, and even if the conditions that allow dew condensation are met, the heat energy remaining in the heating unit 7 is supplied to the air. Since the temperature of the air supply cylinder 25 can be increased by moving to the cylinder 25 side, the occurrence of condensation is suppressed.

In the present embodiment, the combustion operation is stopped after a predetermined time tl or a predetermined time ts has elapsed since the temperature detected by the outside air temperature sensor 20 reaches the predetermined temperature Tm or a temperature lower than the predetermined temperature Tn. Will not be stopped.
Furthermore, in this embodiment, after the outside temperature sensor 20 detects the predetermined temperature Tm or a temperature lower than the predetermined temperature Tn, the target temperature Ts is temporarily changed upward to increase the combustion amount of the heating unit 7. Since the combustion operation is stopped, the temperature at the heating terminal 24 does not become low in a short time after the combustion operation is stopped.
Further, in the present embodiment, when the temperature detected by the heating / hot water temperature sensor 34 again detects the target temperature Ts or the target temperature Ts or less after the combustion operation performed based on the detection temperature of the outside air temperature sensor 20 is stopped. In addition, since the combustion operation is resumed, a heating effect that is not different from the normal heating operation can be expected even after the combustion operation is stopped.
Therefore, even if the combustion apparatus 1 of the present embodiment stops the combustion operation for the purpose of preventing dew condensation, the feeling of use is not impaired.

Further, the present embodiment can function effectively even when the heating operation and the hot water supply operation are performed simultaneously. That is, when the heating operation and the hot water supply operation are performed simultaneously, the combustion operation based on the outside air temperature is not stopped unless the hot water supply operation is stopped. In other words, when the heating operation and the hot water supply operation are performed simultaneously, the combustion operation is not stopped even if the condition for stopping the combustion operation based on the outside air temperature is satisfied. Therefore, when the heating operation and the hot water supply operation are performed simultaneously, the combustion apparatus 1 stops the combustion operation after the hot water supply operation is stopped if the condition for stopping the combustion operation based on the outside air temperature is satisfied. Is done.
In addition, even if the combustion apparatus has a function of dropping into the bath or retreating, if the heating operation is performed alone, the stop of the combustion operation based on the outside air temperature is controlled. Similar effects can be obtained.

  Furthermore, in the present embodiment, control is performed to shorten the post-purge time in the fan 10 to the minimum necessary period, so that most of the thermal energy in the heating parts 5 and 7 is discharged from the exhaust cylinder 26 by post-purge. Can be prevented. That is, the heat energy in the heating unit 7 can be effectively used for the purpose of raising the temperature of the air supply cylinder 25.

  In the above-described embodiment, the configuration in which the combustion operation is stopped based on the outside air temperature when the outside air temperature sensor 20 detects a temperature lower than the predetermined temperature and a predetermined time has elapsed has been described. However, the present invention is not limited thereto. For example, the configuration may be such that the combustion operation is stopped based on the outside air temperature only on the condition that the outside air temperature sensor 20 detects a temperature lower than a predetermined temperature. However, in this case, as described above, since there is a concern that the combustion operation is frequently stopped, the above configuration is preferable.

In the above embodiment, the configuration is shown in which the combustion operation is restarted on the condition that the heating hot water temperature sensor 34 detects the target temperature Ts after stopping the combustion operation based on the outside air temperature. For example, as shown in the flowchart of FIG. 5, it is confirmed whether the heating hot water temperature sensor 34 detects the target temperature Ts or whether a certain time has elapsed after the combustion operation is stopped. The combustion operation may be resumed if any one of the conditions is satisfied. (Second Embodiment)
Further, as shown in the flowchart of FIG. 6, it may be configured to check only whether a predetermined time has elapsed after the combustion operation is stopped, and to stop the combustion operation if the condition is satisfied. (Third embodiment)

  Moreover, in the said embodiment, immediately after the predetermined time passes after the outdoor temperature sensor 20 detects temperature lower than predetermined temperature, the structure which changes the target temperature Ts of the temperature of the hot water discharged from the expansion tank 31 upwards. Although shown in the present invention, the present invention is not limited to this. For example, immediately after a lapse of a predetermined time after the outside temperature sensor 20 detects a temperature lower than a predetermined temperature, the combustion operation is once stopped, and thereafter, As shown in the graph, when the temperature detected by the heating hot / cold water temperature sensor 34 reaches a temperature equal to or lower than the target temperature Ts, the combustion temperature may be resumed by changing the target temperature Ts upward. In this case, the target temperature Ts is changed upward and the combustion operation is restarted. When the temperature detected by the heating hot water temperature sensor 34 reaches the high temperature abnormal temperature Th, the combustion operation is stopped again, and the subsequent operation is The operation is the same as that of the above embodiment. (Fourth embodiment)

  In the above embodiment, when the combustion operation is restarted after the combustion operation based on the detected temperature of the outside air temperature sensor 20 is stopped, the configuration is based on the condition that the detected temperature of the outside air temperature sensor 20 is detected below the target temperature Ts. However, the present invention is not limited to this, and the configuration may be such that normal proportional control is performed from the moment when the outside air temperature sensor 20 reaches the high temperature side control temperature Tj.

  In the above embodiment, the configuration is shown in which the target temperature Ts of the hot water discharged from the expansion tank 31 is changed upward on the condition that the outside air temperature sensor 20 detects a temperature lower than the predetermined temperature. However, the present invention is not limited to this, and when the above condition is satisfied, the current combustion amount of the heating unit 7 on the heating side may be temporarily increased. For example, as a specific example, if the heating unit 7 on the heating side has a plurality of combustion regions, the combustion amount is controlled from a combustion amount using one combustion region to a combustion amount using two combustion regions, or combustion is performed. It is possible to control the combustion to the upper combustion amount in the current combustion region without increasing the region, or to control the combustion with the maximum combustion amount. Thus, if the control based on the combustion amount is performed, the amount of heat for heating the hot water can be temporarily increased without depending on the target temperature of the hot water.

DESCRIPTION OF SYMBOLS 1 Combustion apparatus 2 Hot water can body 3 Heating can body 4 Case 5, 7 Heating part 9, 10, Fan 20 Outside temperature sensor (temperature detection means)
24 Heating terminal (floor heating equipment, fan convector)
25 Supply cylinder 26 Exhaust cylinder 34 Heating hot / cold water temperature sensor (heat medium temperature detection means)
Th High temperature abnormal temperature Tj High temperature side control temperature Tm, Tn Predetermined temperature Ts Target temperature Tv Forced stop temperature

Claims (7)

It has a heating section that burns fuel to generate combustion gas, a fan, an air supply path that supplies air to the heating section from outside, and an exhaust path that discharges combustion gas to the outdoors, and drives the fan It is an indoor installation type combustion device that circulates gas in the air supply path and the exhaust path,
Having temperature detecting means for detecting the temperature of the air passing through the air supply path ;
A combustion apparatus characterized in that the combustion operation is temporarily stopped on the condition that the temperature detection means detects a temperature lower than a predetermined temperature. Combustion apparatus according to claim 1, before Symbol detected temperature is in the condition that a predetermined time has elapsed from the detection of a temperature lower than a predetermined temperature, characterized in that it temporarily stops the combustion operation.   The heating unit heats hot water or a heat medium, and at least a part of a circulation circuit in which the hot water or the heat medium formed between the heating unit and an external heating terminal circulates is arranged. The combustion apparatus according to claim 1 or 2. A heating medium temperature detecting means for detecting the temperature of hot water or a heating medium supplied to the heating terminal;
The hot water or heat medium supplied to the heating terminal is heated so that the detected temperature of the heat medium temperature detecting means approaches the target temperature,
The combustion apparatus according to claim 3, wherein the target temperature is temporarily changed upward when at least a condition for stopping the combustion operation is satisfied.   When at least the condition for stopping the combustion operation is satisfied, the combustion amount in the heating section for heating the hot water or the heat medium supplied to the heating terminal is temporarily controlled to be higher than the current combustion amount. The combustion apparatus according to claim 3. From being changed upwards target temperature temporarily, after the combustion operation is stopped, or the heat transfer medium temperature detecting means detects a target temperature below the temperature before the change, there have is combustion operation is stopped The combustion apparatus according to claim 4, wherein the combustion operation is resumed when a predetermined time has elapsed. A heating medium temperature detecting means for detecting the temperature of hot water or a heating medium supplied to the heating terminal;
The hot water or heat medium supplied to the heating terminal is heated so that the detected temperature of the heat medium temperature detecting means approaches the target temperature,
Combustion amount is temporarily increased, the combustion after the operation is stopped, the heat medium temperature detecting means or detecting a target temperature below the temperature before the change, a predetermined time from a certain There are combustion operation is stopped The combustion apparatus according to claim 5, wherein the combustion operation is resumed when the time has elapsed.

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