JP5846433B2 - Heat source machine - Google Patents

Description

  The present invention relates to a heat source machine that can recover the latent heat of combustion gas and that has a function of preventing leakage of combustion gas by completing a water-sealing structure with drain generated when recovering the latent heat.

  In recent years, in order to improve the heat exchange efficiency of heat generated when a burner is burned, a latent heat recovery type heat source machine that recovers not only sensible heat of combustion gas but also latent heat has been widely used in the market. This latent heat recovery type heat source machine is equipped with a secondary heat exchanger that mainly recovers latent heat in addition to a primary heat exchanger that mainly recovers sensible heat of the combustion gas. Since it can be condensed to obtain condensation heat (latent heat), high heat exchange efficiency can be achieved.

  In such a heat source device, when the combustion gas is introduced into the secondary heat exchanger and the latent heat is recovered, the combustion gas and the secondary heat exchanger come into contact with each other, so that water vapor in the combustion gas is condensed. Drain (condensation water) is generated. At this time, the combustion gas contains nitrogen oxides produced by the reaction of nitrogen and oxygen in the air by combustion, sulfur oxides produced by the reaction of the sulfur content of the fuel with oxygen by combustion, etc. Has been. Therefore, the generated drain is strongly acidic due to these nitrogen oxides and sulfur oxides. As described above, in the latent heat recovery type heat source machine, structurally strong acid drainage is generated.

  If this acidic drain is drained to the outside without being treated, there is a concern that it may adversely affect the environment and the like. For this reason, some latent heat recovery type heat source machines are provided with a drain discharge system for leading the drain to the outside, and provided with a neutralizer for neutralizing acidic drain in the middle of the drain discharge system. In this type of heat source machine, since the drain generated in the secondary heat exchanger is neutralized by the neutralizer and then drained to the outside, there is no adverse effect on the environment.

By the way, in the heat source machine provided with such a drain discharge system, the flow path of the combustion gas and the drain discharge system are communicated with each other. That is, when such a heat source device is installed indoors, the drain discharge system and the exhaust gas exhaust passage are in communication with each other. There is a concern that it will be discharged directly from the heat source machine into the room through the drain discharge system. Further, when the burner is incompletely burned, harmful or dangerous gas such as carbon monoxide or unburned combustion gas (so-called raw gas) in the combustion exhaust (hereinafter also simply referred to as harmful gas). If it is generated and the harmful gas is discharged into the room, the human body of the user may be affected.
Therefore, in a conventional indoor heat source machine, a plurality of rooms are provided in the neutralizer, and the communication holes communicating between the rooms are filled with drain and sealed with water, and the water sealing structure allows the circulation of harmful gases. Measures to forcibly stop are generally adopted.

  However, this water-sealed structure using drain is limited to a case where a predetermined amount or more of drain is stored in the container, and therefore does not function effectively unless sufficient drain is stored in the container. That is, when a neutralizer is newly installed, or when drainage in the neutralizer vessel is artificially removed for the purpose of preventing or freezing drainage, there is no drainage in the vessel. The water seal structure is not formed. Therefore, Patent Document 1 discloses a heat source apparatus including a neutralizer that is forcibly supplied with water according to the water level of the drain in the container in order to form a reliable water seal. That is, the heat source apparatus of Patent Document 1 monitors whether or not the inside of the neutralizer vessel is at or above the reference water level by an electrode for detecting the water level, and if the water level falls below the reference water level, In addition, water is passed through the auxiliary water supply pipe to adjust the water level in the container to a reference water level or higher.

Japanese Patent No. 2008-298367

However, the heat source apparatus of Patent Document 1 needs to be provided with an auxiliary water supply pipe for supplying water, and a space for arranging the auxiliary water supply pipe in the housing of the heat source apparatus is required. Moreover, parts, such as a solenoid valve for controlling water supply, are also required.
Moreover, the situation where the water seal structure is not formed in the neutralizer as described above mainly occurs only when the heat source apparatus is first started or restarted after a long pause. That is, once the drain is filled in the neutralizer vessel and a water seal is formed, the auxiliary water supply pipe is often unnecessary. Furthermore, in the case where the water seal structure is not formed in the neutralizer, the combustion operation such as the hot water supply operation and the heating operation cannot be performed until the water seal is formed.

  Therefore, the present invention solves the above-described problems, and an object of the present invention is to provide a heat source machine that can safely perform a combustion operation even if a water seal structure is not formed. .

  In general, if the amount of combustion gas leaked from the combustion gas flow path to the drain discharge system is very small or the concentration of harmful gas is extremely low, the Sealing is complete. Therefore, even if the water seal is not formed at the start of the combustion operation, in most cases, there is a fact that the water seal can be formed without affecting the human body. Therefore, the inventor predicts the indoor concentration of the harmful gas in the room in a situation where the water seal structure is not formed in the neutralizer, and leaks from the heat source device by suppressing the indoor concentration to a predetermined concentration or less. We considered preventing harmful gases from affecting users.

  The invention according to claim 1 derived based on the above consideration is provided in a combustion part, a combustion gas passage through which combustion gas generated in the combustion part flows, and a part of the combustion gas passage. A heat source mainly having a heat exchanger for recovering latent heat of combustion gas and a neutralizer for neutralizing drain water generated when heat is exchanged in the heat exchanger, wherein the neutralizer is When a certain amount or more of drain water accumulates, a water seal portion is formed inside to prevent the passage of gas, and the neutralizer has water detection means capable of detecting the presence or absence of drain water, The combustion part can be combusted under the condition that there is drain water in the reactor. If there is no drain water in the neutralizer, a part of the combustion gas is neutralized by burning the combustion part. It is assumed that the external combustion gas is discharged via Calculating the concentration of the gas, the concentration of the combustion gas concentration or a specific gas as a heat source machine, wherein the combustion unit only until reaching the above predetermined concentration of combustible.

Here, “no water” means that the amount of water remaining in the neutralizer is less than a certain level. Specifically, whether or not a water-sealed state is formed is an indicator of judgment, and the state where water is in the neutralizer represents a state where a water-sealed state is formed, and water is present in the neutralizer. The state where there is no water represents a state where a water seal state is not formed.
The “specific gas concentration” is preferably the component concentration of the combustion gas generated when the combustion section burns. For example, carbon monoxide concentration, carbon dioxide concentration, nitride oxide concentration, and sulfur oxide concentration are preferable.

According to the configuration of the present invention, when a certain amount or more of drain water accumulates, the neutralizer forms a water seal inside to prevent the passage of gas. And a combustion part becomes combustible on the condition that there exists drain water in a neutralizer. That is, when there is drain water in the neutralizer (water-sealed state), the water-sealed portion prevents harmful gases from passing outside the neutralizer (downstream in the flow direction of the combustion gas). As with the above-described conventional heat source machine, the combustion section can be burned safely.
On the other hand, when there is no drain water in the neutralizer (when it is not in a water-sealed state) as in the case of a conventional heat source machine, since a certain amount or more of drain water does not accumulate, a water-sealed portion is not formed inside, and the gas I can't block the passage.
In such a case, if it is a conventional heat source machine, it is necessary to provide a carbon monoxide sensor for calculating the carbon monoxide concentration in the indoor space separately from the carbon monoxide sensor for detecting incomplete combustion. is there. That is, it is necessary to provide at least two carbon monoxide sensors, which increases the cost.
Therefore, according to the configuration of the present invention, it is assumed that a part of the combustion gas is discharged to the outside through the neutralizer by burning the combustion section, and the external combustion gas concentration or specificity at that time is specified. The combustion portion is combustible only until the concentration of the gas is calculated and the concentration of the combustion gas or the concentration of the specific gas reaches a predetermined concentration or more. That is, assuming that a part of the combustion gas formed in the combustion section is discharged to the outside via the neutralizer, the external combustion gas calculated experimentally and / or computationally in the past Based on the concentration or the concentration of the specific gas, the actual external combustion gas concentration or the concentration of the specific gas is calculated. And until the value exceeds a predetermined reference value, it is not affected by the human body (it is safe), so combustion in the combustion section is permitted. In most cases, when time elapses, drainage is accumulated in the neutralizer without forming a predetermined reference value, and a water seal portion is formed.
On the other hand, if the value exceeds a predetermined reference value, there is a possibility that the human body may be affected (unsafe), so that combustion in the combustion section is forcibly stopped.
Therefore, even if the water seal state is not formed or until the water seal state is formed, a combustion operation such as a hot water supply operation or a heating operation can be performed within a range that does not affect the user. . That is, it can be used safely and immediately without waiting for the formation of a water-sealed state. Moreover, by performing a combustion operation, drain accumulates in the neutralizer, and forms a water seal in the neutralizer.
In addition, according to the configuration of the present invention, it is not necessary to newly install a carbon monoxide sensor for calculating the carbon monoxide concentration in the indoor space or a solenoid valve or piping to form a water seal structure. Cost can also be reduced as compared with the prior art.

  According to the second aspect of the present invention, the combustion section starts combustion, calculates the external combustion gas concentration or the specific gas concentration, and limits the combustion amount of the combustion section according to the result. The heat source machine according to claim 1.

  According to the structure of this invention, the combustion amount of a combustion part is restrict | limited according to the result of having calculated the external combustion gas density | concentration or the density | concentration of specific gas. For example, the reference value is provided at a concentration lower than the predetermined concentration described above, and the combustion amount is limited when the result of calculating the external combustion gas concentration or the specific gas concentration exceeds the reference value. By limiting the amount of combustion, the amount of combustion gas generated can be suppressed, and the amount of combustion gas or specific gas discharged to the outside can be suppressed. Therefore, it is possible to delay the time until the discharge amount of the combustion gas or specific gas to the outside reaches a predetermined concentration. For example, when the heat source device is installed in a space where gas (air or the like) enters and exits, the concentration of the combustion gas in the space or the concentration of the specific gas is reduced by natural ventilation in the space. And since the balance of combustion gas concentration or balance in the space of the specific gas shifts in the direction of being discharged to the outside, the combustion gas concentration in the space or the concentration of the specific gas is difficult to reach a predetermined concentration, and the combustion operation is performed. It is possible to seal with water without stopping.

  3. The heat source apparatus according to claim 1, wherein the concentration of the exhausted combustion gas or the specific gas is obtained using a correlation between a combustion time in the combustion operation and a stop time in which the combustion operation is stopped. Preferably, it is calculated by a concentration multiplication process calculated from the combustion time and a concentration division process calculated from the stop time.

  According to the configuration of the present invention, a combustion operation such as a hot water supply operation or a heating operation can be performed as long as it is not affected by the human body even if the water seal state is formed. That is, it can be used safely and immediately without waiting for the formation of a water-sealed state. Further, since it is not necessary to newly install a carbon monoxide sensor for newly calculating the carbon monoxide concentration in the indoor space, a water injection device and its circuit, etc., the cost can be reduced.

It is a front view of the heat source machine of the embodiment of the present invention. It is an operation | movement principle figure of the heat source machine of FIG. It is a conceptual diagram around the neutralizer of the heat source machine of FIG. It is explanatory drawing in case the water seal part is not formed in FIG. It is explanatory drawing in case the water seal part is formed in FIG. It is a block diagram which shows the relationship between the control apparatus and each apparatus in the heat-source equipment of FIG. It is a graph which shows notionally the relationship between time and the carbon monoxide density | concentration assumed to be discharged | emitted indoors in the heat source apparatus of FIG. 1, (a) is a graph of hot water supply single mode, (b) heating single mode (C) is a graph of the hot water supply / heating combined mode. It is a flowchart showing the water seal control operation | movement of 1st Embodiment. FIG. 9 is a graph conceptually showing the relationship between the time in the example of FIG. 8 and the carbon monoxide concentration assumed to be discharged indoors, (a) is the relationship between the time during combustion operation and the carbon monoxide concentration; b) is the relationship between the time when the combustion operation is stopped and the carbon monoxide concentration. It is a flowchart showing the water seal control operation | movement in an example of FIG. 8, and progress is represented by the bold type. It is a flowchart showing the process of the density | concentration multiplication process of FIG. It is a flowchart showing the process of the density | concentration division process of FIG. (A) It is a graph which shows notionally the relationship between the time at the time of driving | running a basic combustion operation | movement intermittently, and the carbon monoxide density | concentration assumed to be discharged | emitted indoors, (b) is the neutralization at that time It is a graph showing the water level of a vessel. (A) It is a graph which shows notionally the relationship between the time at the time of driving | running a basic combustion operation | movement continuously, and the carbon monoxide density | concentration assumed to be discharged | emitted indoors, (b) is the neutralization at that time It is a graph showing the water level of a vessel. (A) It is a graph which shows notionally the relationship between the time at the time of driving | running | working a basic combustion operation | movement, and the carbon monoxide density | concentration assumed to be discharged | emitted indoors, (b) is the water level of the neutralizer at that time It is a graph showing. It is a flowchart showing the water seal control operation | movement of 2nd Embodiment. It is a graph which shows notionally the relationship between the time in the example of FIG. 16, and the carbon monoxide density | concentration assumed to be discharged | emitted indoors. It is a flowchart showing the water seal control operation | movement in an example of FIG. 16, and progress is represented by the bold type. It is a flowchart showing the water seal control operation | movement of 3rd Embodiment. FIG. 20 is a graph conceptually showing the relationship between the time in the example of FIG. 19 and the carbon monoxide concentration assumed to be discharged indoors (when the combustion amount after changing the combustion limiting operation is large). It is a flowchart showing the water seal control operation | movement in an example of FIG. 20, and progress is represented by the bold type. It is a flowchart showing the process of the density | concentration multiplication process in the combustion restriction | limiting operation | movement of FIG. 19, or a density | concentration division process. FIG. 21 is a graph conceptually showing a relationship between time and carbon monoxide concentration assumed to be discharged indoors in an example different from the water seal control operation of FIG. 20 (the combustion amount after changing the combustion restriction operation is small). If).

Below, the heat source machine 1 which concerns on 1st Embodiment of this invention is demonstrated.
The heat source apparatus 1 of this embodiment is installed in the indoor space where gas mainly enters and exits. That is, the housing 101 of the heat source device 1 of the present embodiment is installed in a naturally ventilated indoor space such as a general house.
Moreover, the heat source machine 1 of this embodiment has the two combustion parts 2 (2a, 2b), as shown in FIG. That is, the heat source device 1 includes a hot water supply combustion unit 2a that forms a hot water supply side combustion system and a heating combustion unit 2b that forms a heating side combustion system. A hot water supply circuit 7 (see FIG. 2) for flowing hot water to a hot water tap or the like is connected to the hot water combustion section 2a, and a heating circuit for flowing hot water or a heat medium to an external heating device (not shown) is connected to the heating combustion section 2b. 8 (see FIG. 2) is connected.
As shown in FIG. 1, the heat source unit 1 includes a combustion unit 2, primary heat exchangers 3 a and 3 b that mainly recover sensible heat, and secondary heat exchange that mainly recovers latent heat in a housing 101. And a neutralizer 10 for neutralizing the drain generated in the secondary heat exchanger 6 and discharging it to the outside of the housing 101.

As shown in FIG. 2, the combustion unit 2 includes a plurality of burners 12 housed in a rectangular parallelepiped case and a blower 15 in each of the hot water combustion unit 2 a and the heating combustion unit 2 b. And the burner 12 is accommodated in the lower part inside a case, and the air blower 15 is attached to the downward direction outside the case. That is, the combustion unit 2 is configured to operate the blower 15 to supply air to each burner 12, and further to supply combustion gas to each burner 12 from a fuel supply source so that each burner 12 burns. Moreover, the function which controls the output of these burners 12 is provided. And the amount of combustion gas supplied to the combustion part 2 increases / decreases. That is, the combustion unit 2 can adjust the combustion amount of the heat source unit 1 by adjusting the burner 12. Then, the combustion gas generated at that time flows toward the upper side of the combustion unit 2 and is discharged from the exhaust port 11 to the outside through the combustion gas flow path. The exhaust port 11 is arranged outside the indoor space, and the exhaust gas emitted from the exhaust port 11 is exhausted to the outside of the indoor space.
Note that the burner 12 of the present embodiment includes a plurality of combustion tubes, and employs a burner that controls the output by the number of combustion tubes that actually generate flames (the number of combustion tubes).

  The primary heat exchangers 3a and 3b are known gas / liquid heat exchangers. The primary heat exchangers 3a and 3b are attached to a part of the respective combustion gas flow paths, and are arranged downstream of the combustion part 2 in the flow direction of the combustion gas. The primary heat exchangers 3a and 3b include copper heat receiving tubes 16 and 17 through which hot water or a heat medium flows, and fins, and the main constituent members are so-called fin-and-tube heat exchangers made of copper. is there. The primary heat exchangers 3a and 3b function as sensible heat recovery means for recovering the sensible heat of the combustion gas, and heat the hot water or the heat medium flowing through the heat receiving pipes 16 and 17. That is, these heat receiving pipes 16 and 17 constitute a part of the hot water supply circuit 7 and the heating circuit 8 and enable heat exchange between the combustion gas and hot water or a heat medium.

The secondary heat exchanger 6 is a known gas / liquid heat exchanger. The secondary heat exchanger 6 is attached to a merging portion of each combustion gas flow path, and is disposed downstream of the primary heat exchangers 3a and 3b in the flow direction of the combustion gas. The secondary heat exchanger 6 is divided into a hot water supply heat exchange section 6a located on the hot water supply circuit 7 side and a heating heat exchange section 6b located on the heating circuit 8 side. And the heat exchange part 6a for hot water supply and the heat exchange part 6b for heating have the heat receiving pipes 20 and 18 into which hot water or a heat medium flows. And these heat receiving pipes 20 and 18 constitute a part of the hot water supply circuit 7 and the heating circuit 8 like the heat receiving pipes 17 and 16 of the primary heat exchangers 3a and 3b, and are composed of combustion gas and hot water or heat medium. Heat exchange between them.
Here, as described above, the secondary heat exchanger 6 mainly recovers the latent heat of the combustion gas. Therefore, in the secondary heat exchanger 6, the temperature of the combustion gas decreases to a certain value or less. As a result, water vapor contained in the combustion gas is liquefied and drainage is generated. Then, when the generated drain is exposed to the combustion gas, nitrogen oxides and sulfur oxides generated by combustion dissolve in the drain and exhibit acidity.

  Therefore, between the primary heat exchangers 3a and 3b and the secondary heat exchanger 6, a drain recovery unit 21 (see FIG. 3) that recovers the drain generated by the latent heat recovery in the secondary heat exchanger 6 is provided. A drain drainage system 22 (see FIG. 1) is connected to the drain recovery unit 21.

  As shown in FIG. 3, the drain drainage system 22 includes a drain introduction pipe 23, a neutralizer 10, and a drain discharge pipe 25.

  The drain introduction pipe 23 is a pipe that connects the drain recovery unit 21 disposed at the lower part of the secondary heat exchanger 6 of the combustion unit 2 and the neutralizer 10, and removes the drain generated in the secondary heat exchanger 6. It is provided so that it can be introduced into the neutralizer 10. The inlet of the drain recovery unit 21 to the drain introduction pipe 23 is provided on the hot water supply circuit 7 side (the hot water supply heat exchange unit 6a side) of the secondary heat exchanger 6. An air charge pipe 31 connected to the secondary heat exchanger 6 is provided in the middle of the drain introduction pipe 23. The air charge pipe 31 is attached to the upper part of the secondary heat exchanger 6 and has a function of returning the combustion gas or harmful gas mixed in the drain introduction pipe 23 to the secondary heat exchanger 6.

As shown in FIG. 3, the neutralizer 10 is divided into a plurality of spaces by a partition wall 26, and a neutralizing agent (not shown) such as calcium carbonate is provided in at least one space. Filled. And the drain which flowed in flows sequentially in this some space. At this time, in each space, the drain that has flowed into the space once stays and flows out of the space when the water level exceeds a certain level. That is, the drain that has flowed into the neutralizer 10 flows out after remaining in the respective spaces in the neutralizer 10 for a predetermined time. Therefore, when the drain passes through the space filled with the neutralizing agent, it slowly passes over time.
Further, the drain is neutralized by reacting with the neutralizing agent while remaining in the space. The neutralized drain flows to the drain discharge port 27 and is discharged from the drain discharge port 27 to the drain discharge pipe 25.

  Here, when the drain stays in the space formed inside the neutralizer 10, the space where the drain is accumulated between the drain inlet 28 and the drain outlet 27 of the neutralizer 10 (FIG. 5). A water seal 24) is formed. As a result, the space between the drain inlet 28 and the drain outlet 27 is water-sealed, and the gas cannot pass (hereinafter also referred to as a water-sealed state). Thus, in addition to the function for neutralizing the drain, the neutralizer 10 also has a function as a water seal device.

  Further, the water detector 30 is attached to the neutralizer 10 on the downstream side of the water seal portion 24 in the drain flow direction. In the present embodiment, an electrode is used as the water detection means 30, and at least the tip of the electrode comes into contact with a liquid such as drain inside the neutralizer 10 as shown in FIG. The water level of the liquid can be detected. That is, the water detection means 30 can determine whether or not it is in a water seal state.

  2 and 3, the drain discharge pipe 25 is provided downstream of the neutralizer 10 in the drain flow direction in the drain drainage system 22, and the drain discharge pipe 25 is connected to the outside of the neutralizer 10 and the heat source unit 1. It is a pipe connecting the discharge port. That is, it is a pipe for discharging the drain discharged from the inside of the neutralizer 10 to the outside of the heat source unit 1.

  The hot water supply circuit 7 is a known hot water supply circuit and is a circuit capable of performing a hot water supply operation. The heating circuit 8 is a known heating circuit and is a circuit capable of heating operation.

  Moreover, in the heat source machine 1 of this embodiment, it has the control apparatus 50 which controls each apparatus of the heat source machine 1 in addition to the said structure like FIG. And the control apparatus 50 is provided with the input part 51, the control part 52, the memory | storage part 53, the calculating part 55, and the output part 56, as shown to the block diagram of FIG.

  In addition to data related to the temperature and flow rate of hot water or heat medium detected by each sensor provided in the hot water supply circuit 7 or the heating circuit 8, data detected from the combustion unit 2 is input to the input unit 51. . The data output from the output unit 56 is also input to the input unit 51. The storage unit 53 and the calculation unit 55 are controlled by the control unit 52.

  The storage unit 53 is a part that stores each data input to the input unit 51 and data such as the relationship between the combustion amount and the carbon monoxide concentration that can be output from the output unit 56 as shown in FIG.

The calculation unit 55 is a part that calculates the amount of combustion in each combustion unit 2 based on the data input to the input unit 51, the data stored in the storage unit 53, and the like.
The output unit 56 is a part that outputs to the combustion unit 2 based on the data calculated by the calculation unit 55. Specifically, the output unit 56 outputs to the burner 12 and the blower 15 in the combustion unit 2. The output unit 56 also outputs the output information to the input unit 51.

Next, the basic combustion operation of the heat source apparatus 1 of the present invention will be described.
The operation of the heat source device 1 of the present embodiment is controlled by the control device 50. And the heat source machine 1 is the hot water supply single mode which performs only hot water supply operation | movement like the conventional heat source machine, the heating single mode which only heats the hot water supplied to an external heating apparatus, or a heat medium, Hot water supply operation | movement and heating It is configured to be able to implement three operation modes including a hot water supply / heating combined mode in which operations are performed simultaneously.
Hereinafter, the three operation modes will be described in order.

(Hot water supply single mode)
The hot water supply single mode is an operation mode in which hot water supplied from a hot water supply source (not shown) is heated and discharged from a hot water tap (not shown).
That is, when a hot water tap (not shown) is operated, hot water is supplied from a water supply source (not shown) to the hot water supply circuit 7, and the temperature of the hot water introduced into the heat source unit 1 by each sensor provided on the hot water supply circuit 7 (incoming water temperature). ) And flow rate (incoming water flow rate). Then, when the information is transmitted to the control device 50 and it is confirmed that the incoming water flow rate is equal to or higher than the minimum operating flow rate (hereinafter referred to as MOQ), the combustion operation on the hot water supply combustion unit 2a side is started. .

When the burner 12 in the hot water supply combustion section 2a is ignited by the ignition device, combustion gas is generated in the hot water supply combustion section 2a, and hot water flowing through the heat exchanger 3a and the hot water supply heat exchange section 6a by the combustion gas Is heated. And after passing the heat exchange part 6a for hot water supply, after passing through the heat exchanger 3a, the heated hot water is mixed with hot water supplied from a water supply source (not shown) on the downstream side and adjusted to an appropriate temperature, Hot water is discharged from the water tap.
Note that the amount of combustion in the hot water supply combustion section 2a is based on information such as preset hot water setting temperature, incoming water temperature, incoming water flow rate, and hot water temperature after heating (hot water temperature) in the hot water heat exchange section 6a. To be determined.
The operation of the hot water supply operation described above is referred to as basic hot water supply operation.

(Heating only mode)
In the heating only mode, hot water or a heat medium (simply referred to as hot water) in the heating circuit 8 is heated without causing a hot water flow in the hot water supply circuit 7, and the hot water is circulated between external heating devices. This is an operation mode.
That is, when a switch of an external heating device is operated, a heating circulation pump (not shown) in the heating circuit 8 is driven, and the temperature of hot water introduced into the heat source unit 1 by a sensor provided on the heating circuit 8. Is detected. Then, the information is transmitted to the control device 50, and the combustion operation on the heating combustion unit 2b side is started based on the preset target temperature and the current hot water temperature.

  When the burner 12 in the heating combustion section 2b is ignited by the ignition device, the hot water flowing through the heat exchanger 3b and the heating heat exchange section 6b is heated by the combustion gas generated in the heating combustion section 2b. The hot water is supplied to the external heating device. In addition, as a heating apparatus, there exist some which require hot water (for example, 80 degree centigrade), such as a fan convector, and those which require comparatively low temperature (for example, 60 degree centigrade), such as a floor heater.

(Hot water / heating combined mode)
The hot water / heating combined mode is an operation mode in which the operation in the hot water single mode for heating the hot water for hot water and the operation in the single heating mode for heating the hot water supplied to the heating device are controlled simultaneously. is there. That is, the basic operation of the heat source unit 1 in the normal time in the hot water supply / heating combined mode can be applied to the above description, and thus the description thereof is omitted.

These basic combustion operations are performed after the water-sealed structure is formed in the case of control of a conventional heat source machine. That is, there is a problem that the user cannot use until the water seal is formed as described above. In the case of a conventional heat source machine, a carbon monoxide sensor is provided in the vicinity of the exhaust port 11 in order to detect incomplete combustion. In the case of a structure that performs basic combustion operation without forming a water seal, in the conventional heat source machine, in addition to the carbon monoxide sensor, a carbon monoxide sensor for newly calculating the carbon monoxide concentration in the room. It is necessary to provide. That is, it is necessary to provide at least two carbon monoxide sensors, and there is a problem that the cost is increased.
On the other hand, in the heat source apparatus 1 of this embodiment, even if no water seal is formed, the basic combustion is performed within a safe range by using the water seal control operation which is a characteristic control of the present invention. The action can be performed. Moreover, the heat source apparatus 1 of this embodiment does not need to newly provide a carbon monoxide sensor by using the water seal control operation.

Hereinafter, the water seal control operation which is characteristic control of the present invention will be described mainly with reference to FIGS.
In addition, this water seal control operation is controlled on the assumption that a part of the exhaust port 11 of the heat source unit 1 is blocked to the combustion limit.
That is, the heat source unit 1 has a carbon monoxide sensor in the vicinity of the exhaust port 11 in order to detect incomplete combustion, as in the conventional heat source unit. The exhaust gas carbon monoxide concentration is detected, and when this concentration exceeds a certain value, combustion stops. Originally, as described above, the combustion gas is directly discharged to the outside of the room through the exhaust port 11, so even if the carbon monoxide concentration in the combustion gas increases, the air in the indoor space is not contaminated. However, when the water seal of the neutralizer 10 is broken, carbon monoxide flows into the indoor space.
The heat source device 1 of the present embodiment has the carbon monoxide sensor as described above, and combustion stops when the concentration of carbon monoxide in the exhaust gas exceeds a certain value. Therefore, the carbon monoxide in the combustion gas is constant as described above. It cannot be more than the concentration of the value. Therefore, the fixed value is adopted as the maximum value of the carbon monoxide concentration in the combustion gas.
Further, the cause of incomplete combustion may be a case where the blower 15 fails, a case where the primary heat exchangers 3a, 3b and the secondary heat exchanger 6 are clogged, or a case where the exhaust port 11 is clogged. It is done. Among these, the case where the combustion gas flows most into the indoor space is when the exhaust port 11 is clogged. Therefore, it is assumed that the exhaust port 11 is clogged to the combustion limit as the maximum value of the carbon monoxide concentration in the combustion gas.

The flow of the operation will be described according to the case of FIG. 9 showing an example of the locus of the water seal control operation, and then the operation derived from the flow of the operation will be described.
First, normal operation is started and a combustion operation standby state in which basic combustion operation is permitted is set (step 1). Here, “permitting the basic combustion operation” means that the above-described basic combustion operation can be performed. At the same time, the density calculation timer is turned on so that the elapsed time can be calculated (step 2). Thereafter, the water sealing state is confirmed by the water detection means 30 of the neutralizer 10 (step 3). Specifically, the water level in the neutralizer 10 is confirmed. At this time, when this water detection means 30 does not detect a predetermined water level, it is not in a water seal state as shown in FIG. 4 (non-water seal state), and when the water detection means 30 detects a water level, It is determined that the water seal state as shown in FIG.
When it is determined that it is not in the water-sealed state (when Step 3 is No), it is determined whether or not the basic combustion operation described above is being performed (Step 4).
At this time, if the basic combustion operation is being performed (Yes in step 4), the type and the combustion amount of the basic combustion operation (such as the output of the burner 12 and the blower 15) are simultaneously recognized.
Then, the process proceeds to step 5 and the failure detection timer is turned on. If the failure detection timer is in a paused state, it is restarted. Note that this failure detection timer is a timer for detecting a failure to the last, and is not used for density calculation unlike the density calculation timer.
Thereafter, density multiplication processing is performed (step 6).
Specifically, as shown in FIG. 11, the elapsed time from the start of the basic combustion operation is calculated by the concentration calculation timer and input to the calculation unit 55 (step 6a). Thereafter, C1 is calculated based on the value, the type of basic combustion operation recognized in step 3 and the combustion amount (step 6b).
And the carbon monoxide concentration expected to be discharged into the indoor space by the basic combustion operation is calculated by the following calculation formula (1) according to JIA A 008-11a (semi-enclosed instantaneous water heater compatibility inspection regulations). (Step 7).
Specifically, the calculation formula (1) is introduced as follows in accordance with JIA A 008-11a (semi-sealed instantaneous water heater compatibility inspection regulations).

Where Q is the ventilation rate (m ³ / h), M is the amount of combustion gas generated in the humid state (m ³ / h), p is the average carbon monoxide concentration (ppm) in the dry combustion exhaust gas, and q is the ventilation Represents the rate and is represented by the general formula Q = qV-M (Q ≧ 0).

K is the carbon monoxide concentration (ppm) in the indoor space after a predetermined time has elapsed from the start of the basic combustion operation, and t is the predetermined time (specifically, the start of the basic combustion operation obtained from the concentration calculation timer). Elapsed time), C1 is a positive constant obtained by experiment, and is a numerical value calculated by performing an experiment in accordance with the type and amount of combustion of the basic combustion operation. That is, the multiplication process is performed on the carbon monoxide concentration at the start of the basic combustion operation.
In this embodiment, the ventilation rate is calculated according to JIS A 1406. Specifically, the volume V of the indoor space is assumed to be 16.8 m ³ (cubic meter), and the ventilation rate q is set to 0.5. Used as times / hour.

  Note that the correlation between the elapsed time t from the start of the combustion operation and the carbon monoxide concentration K is as shown in FIG. That is, the graph rises to the right.

If the calculated carbon monoxide concentration in the indoor space is equal to or higher than the predetermined concentration α (Yes in step 8), it is determined that the indoor space is contaminated with the carbon monoxide concentration. At this time, the predetermined concentration α is an arbitrary numerical value, and is a numerical value that is not affected by the human body even if a person exists in the indoor space of the predetermined concentration α. Specifically, the predetermined concentration α is a numerical value smaller than 300 ppm which is a judgment index as a dangerous value in JIA A 008-11a.
Thereafter, the failure detection timer and the concentration calculation timer are reset (step 12), the combustion operation is forcibly stopped (step 13), and the heat source unit 1 cannot be operated. That is, the heat source device 1 is in a state where it cannot execute the basic combustion operation. At this time, for example, it is preferable to have a structure in which notification means is provided to promote ventilation.
The above is the flow along FIG. 10 as an example of the water seal control operation.

Hereinafter, a flow derived from the flow shown in FIG. 10 will be described.
If the carbon monoxide concentration in the indoor space is less than the predetermined concentration α (No in step 8), the integration time of the failure detection timer is confirmed, and whether the failure detection timer integration time is equal to or greater than the predetermined time β. (Step 9).
If the failure detection timer integration time is equal to or longer than the predetermined time β (Yes in step 9), it is determined that the heat source unit 1 may be broken, and the failure detection timer and the concentration calculation timer are reset (step (step 9)). 12) The combustion operation is forcibly stopped (step 13).
Note that the predetermined time β is a sufficient time for the neutralizer 10 to be sealed with water by the drain generated when the normal basic combustion operation is performed, and may be a constant or the basic combustion operation. It may be a numerical value that varies depending on the type and amount of combustion. That is, the failure detection timer integration time does not exceed the predetermined time β in normal basic combustion operation.
On the other hand, when the failure detection timer integration time is less than the predetermined time β (No in step 9), the process returns to step 3.

If the basic combustion operation is stopped (No in step 4), the failure detection timer is temporarily stopped (step 10).
Thereafter, density division processing is performed (step 11).
Specifically, as shown in FIG. 12, the calculated concentration when the basic combustion operation is stopped and the elapsed time from when the combustion operation is stopped are calculated by the concentration calculation timer and input to the calculation unit 55 (steps 11a and 11b).
Assuming that carbon monoxide is discharged from the indoor space to the outside of the indoor space, the expected carbon monoxide concentration in the indoor space after a predetermined time after stopping the combustion operation Based on the formula and the experimental result, the following calculation formula (2a) is used (step 7).

K is a carbon monoxide concentration (ppm) in the indoor space after a predetermined time from when the combustion operation is stopped, K ₂ is a carbon monoxide concentration (ppm) in the indoor space when the combustion operation is stopped, and t is a predetermined time. (Specifically, the elapsed time from the stop of the basic combustion operation), q represents the ventilation rate. In the present embodiment, the ventilation rate Q is calculated according to JIS A 1406 and used as 0.5 times / hour, as in the multiplication process described above.

  For example, when the combustion operation is stopped at time t1 as shown in FIG. 9 (a), the correlation between time t and carbon monoxide concentration K is as shown in FIG. 9 (b) according to the above calculation formula (2a). become. That is, the graph is a downward sloping graph. Note that the carbon monoxide concentration is 0 when the basic combustion operation is not performed at all since the start of the water ring control operation.

  In Step 3, when it is determined that the neutralizer 10 is in the water seal state (when Step 3 is Yes), the failure detection timer and the concentration calculation timer are reset (Step 14), and the water seal control operation is performed. finish. That is, as long as the water seal state does not always collapse at this time, the basic combustion operation can be performed.

Here, a situation that can actually occur will be described.
The graph of FIG. 9 described above shows a case where continuous operation is performed until the calculated carbon monoxide concentration reaches a predetermined value. That is, the basic combustion operation is forcibly stopped.
Actually, it is rare that continuous operation is performed until a predetermined value is reached, and combustion is stopped midway. For example, if it is a general hot water supply, it is rare to continuously supply hot water in the kitchen, and it is considered that the user frequently closes the faucet. Even in the case of heating operation, it is considered that combustion is automatically turned on and off by the heat demand.
In such a case, every time the basic combustion operation is performed as shown in the graph of FIG. 13, the drain is accumulated, and the drain in the neutralizer is accumulated before reaching the predetermined value α to form a water seal. .
Even if the continuous operation is performed, the drain often accumulates before reaching the predetermined concentration α. In that case, as shown in the graph of FIG. 14, the water level of the drain in the neutralizer rises before reaching the predetermined concentration α in one basic combustion operation, and a water seal is formed.
As an actual operation, these are mixed and there is an interval between the basic combustion operations as shown in the graph of FIG. 15, and the drain of the neutralizer in the neutralizer is reached before reaching a predetermined concentration α in several basic combustion operations. The water level rises and a water seal is formed.
That is, in practice, when the basic combustion operation is performed and the water concentration is not accumulated in the neutralizer until the predetermined concentration α is reached, the water seal is hardly formed.

According to the present invention, when the concentration of carbon monoxide in the indoor space is increased based on the concentration α that is not affected by the human body, the basic combustion operation can be performed safely because the forced stop is performed.
Moreover, since the carbon monoxide concentration is calculated by calculation, it is not necessary to provide a new carbon monoxide sensor. That is, the cost can be reduced as compared with the conventional heat source machine.

  Subsequently, a second embodiment of the present invention will be described below. In addition, the thing similar to 1st Embodiment attaches | subjects the same number, and abbreviate | omits description.

  The heat source device of the second embodiment has a different water seal control operation, and a water seal control operation as shown in the flowchart of FIG. 16 is executed.

Hereinafter, the water seal control operation which is characteristic control of the present invention will be described mainly with reference to FIGS.
In addition, this water seal control operation is controlled on the assumption that a part of the exhaust port 11 of the heat source unit 1 is blocked to the combustion limit, as in the first embodiment.

First, an operation flow will be described according to the case of FIG. 17 representing an example of the water seal control operation, and then an operation derived from the operation flow will be described.
First, normal operation is started, and the combustion operation standby state in which the combustion operation is permitted is set in the same manner as the heat source machine 1 of the first embodiment (step 21). At the same time, the density calculation timer is turned on so that the elapsed time can be calculated (step 22). Thereafter, the water sealing state is confirmed by the water detection means 30 of the neutralizer 10 (step 23).
When it is determined that it is not in the water-sealed state (when Step 23 is No), it is determined whether or not the basic combustion operation described above is being performed (Step 24).
At this time, if the basic combustion operation is being performed (Yes in step 24), the type and amount of combustion (such as the output of the burner 12 and the blower 15) are recognized at the same time.
Then, the process proceeds to step 25, and the failure detection timer is turned on. If the failure detection timer is in a paused state, it is restarted.
Thereafter, as in the first embodiment, density multiplication processing is performed (step 26).
Then, the carbon monoxide concentration expected to be discharged into the indoor space by the basic combustion operation is calculated by the above-described calculation formula (1) (step 27).

If the calculated carbon monoxide concentration in the indoor space is equal to or higher than the predetermined concentration α (Yes in step 28), it is determined that the indoor space is contaminated with carbon monoxide.
Thereafter, the failure detection timer is reset (step 32), the combustion operation is forcibly stopped (step 33), and the heat source unit 1 cannot be operated. That is, the heat source device 1 is in a state where it cannot execute the basic combustion operation.
Thereafter, density division processing is performed (step 34).
Then, assuming that carbon monoxide is discharged from the indoor space to the outside of the indoor space, the expected carbon monoxide concentration in the indoor space after a predetermined time after the combustion operation is stopped is the same as that in the first embodiment. A similar calculation formula (2b) below is used (step 35).

If the calculated carbon monoxide concentration in the indoor space is less than the predetermined concentration γ (Yes in step 36), the combustion operation standby state for permitting the combustion operation in which the normal operation is resumed is set (step 37), and step 23 is performed. Return to.
The concentration γ is an extremely small value compared to the concentration α. Specifically, the concentration γ is 1/100 or less of the concentration α, and preferably 1/1000 or less of the concentration α. The concentration α is particularly preferably 1 / 10,000 or less.
The above is the flow along FIG. 17 as an example of the water seal control operation.

Hereinafter, a flow derived from the water seal control operation of FIG. 17 will be described.
If the calculated carbon monoxide concentration in the indoor space is equal to or higher than the predetermined concentration γ (No in step 36), it is determined that the carbon monoxide concentration in the indoor space is full and not ventilated, and step 34 is performed. Return to. As described above, γ is smaller than α.
If the carbon monoxide concentration in the indoor space is less than the predetermined concentration α (No in step 28), the accumulated time of the failure detection timer is confirmed, and is the failure detection timer accumulated time equal to or greater than the predetermined time β. Confirm (step 29).
When the failure detection timer integration time is equal to or longer than the predetermined time β (Yes in step 29), the failure detection timer and the concentration calculation timer are reset (step 39), and the combustion operation is forcibly stopped (step 40).
On the other hand, when the failure detection timer integration time is less than the predetermined time β (No in step 29), the process returns to step 23.

When the basic combustion operation is stopped (No in step 24), the failure detection timer is temporarily stopped (step 30).
Thereafter, density division processing is performed (step 31).
Then, assuming that carbon monoxide is discharged from the indoor space to the outside of the indoor space, the expected carbon monoxide concentration in the indoor space after a predetermined time after stopping the combustion operation is calculated using the above formula (2a). ) (Step 27).

  In Step 23, when it is determined that the neutralizer 10 is in the water seal state (when Step 23 is Yes), the failure detection timer and the concentration calculation timer are reset (Step 37), and the water seal control operation is performed. finish. That is, as long as the water seal state does not always collapse, the basic combustion operation can be performed.

  With the heat source device of this embodiment, when the calculated carbon monoxide concentration in the indoor space becomes less than the predetermined concentration γ, the state returns to the combustion operation standby state in which the basic combustion operation is permitted. Although it is not preferable, on the other hand, since it is not necessary to call a contractor, it is effective as a heat source machine for business use.

  Subsequently, a third embodiment of the present invention will be described below. In addition, the thing similar to 1st Embodiment attaches | subjects the same number, and abbreviate | omits description.

  The heat source device of the third embodiment is different from the heat source device of the first embodiment in the water seal control operation, and the water seal control operation as shown in the flowchart of FIG. 19 is executed.

Hereinafter, a water seal control operation which is a characteristic control of the present invention will be described with reference to FIGS.
In addition, this water seal control operation is controlled on the assumption that a part of the exhaust port 11 of the heat source unit 1 is blocked to the combustion limit, as in the first embodiment.

First, an operation flow will be described in accordance with the case of FIG. 20 representing an example of the water seal control operation, and then an operation derived from the operation flow will be described.
First, normal operation is started, and the combustion operation standby state in which the combustion operation is permitted is set in the same manner as the heat source machine 1 of the first embodiment (step 51). At the same time, the density calculation timer is turned on so that the elapsed time can be calculated (step 52). Thereafter, the water seal state is confirmed by the water detection means 30 of the neutralizer 10 (step 53).
When it is determined that it is not in the water seal state (when Step 53 is No), it is determined whether or not the basic combustion operation described above is being performed (Step 54).
At this time, if the basic combustion operation is being performed (Yes in step 54), the type and amount of combustion (such as the output of the burner 12 and the blower 15) are recognized at the same time.
Then, the process proceeds to step 55, and the failure detection timer is turned on. If the failure detection timer is in a paused state, it is restarted.
Thereafter, as in the first embodiment, density multiplication processing is performed (step 56).
Then, the carbon monoxide concentration expected to be discharged into the indoor space by the basic combustion operation is calculated by the above calculation formula (1) (step 57).

If the calculated carbon monoxide concentration in the indoor space is equal to or higher than the predetermined concentration δ (Yes in step 58), a combustion restriction operation is performed (step 62).
This combustion limiting operation is an operation that limits the amount of combustion used in the normal basic combustion operation. Specifically, it is limited to about 40 to 80 percent of the normal combustion amount. The “normal combustion amount” here is a combustion amount required when the basic combustion operation is performed, and differs depending on the type of the basic combustion operation.
Further, the predetermined concentration δ is a value smaller than α, specifically, 40% to 90% of α, preferably 50% to 80% of α, and from 60% of α. Particularly preferred is 70 percent.

Thereafter, the water sealing state is confirmed by the water detection means 30 (step 63).
When it is determined that the water seal state is not established (when Step 63 is No), a multiplication process or a division process is performed based on the combustion amount limited in Step 62 (Step 64).
Specifically, as shown in FIG. 22, the elapsed time from the start of the combustion limiting operation is calculated by the concentration calculation timer and input to the calculation unit 55 (step 64a). Thereafter, C1 is calculated based on the value and the type and amount of basic combustion operation restricted in step 62 (step 64b).
And the carbon monoxide concentration expected to be discharged into the indoor space by the combustion restriction operation is in accordance with JIA A 008-11a (semi-enclosed instantaneous water heater compatibility inspection regulations) as in the above calculation formula (1). Then, it is calculated by the following calculation formula (3) (step 65).

K is the carbon monoxide concentration (ppm) in the indoor space after a predetermined time has elapsed from the start of the combustion limiting operation, t is the predetermined time (specifically, the elapsed time from the start of the combustion limiting operation), and C3 Is a constant obtained by experiment, and is a numerical value calculated by conducting an experiment in accordance with the type and amount of combustion of the basic combustion operation. q represents a ventilation rate.
Here, for C3, the inequality sign changes depending on the position of the asymptote in the graph drawn in the combustion limiting operation. That is, in the diagram as shown in FIG. 20, since the asymptote (not shown) is at a position greater than or equal to δ, C3 is a positive value, and the carbon monoxide concentration at the start of the combustion limiting operation is multiplied. . On the other hand, that is, if the asymptote is at a position less than δ as shown in FIG.
If the calculated carbon monoxide concentration in the indoor space is equal to or higher than the predetermined concentration α (Yes in step 66), it is determined that the indoor space is contaminated with the monoxide concentration.
Thereafter, the failure detection timer and the concentration calculation timer are reset (step 67), the combustion operation is forcibly stopped (step 68), and the heat source machine cannot be operated. That is, the heat source machine is in a state where it cannot execute the basic combustion operation.
The above is the flow along the thick line in FIG. 21 as an example of the water seal control operation.

Hereinafter, a flow derived from the water seal control operation of FIG. 21 will be described.
If the calculated carbon monoxide concentration in the indoor space is less than the predetermined concentration α (Yes in step 66), the process returns to step 63.
If the carbon monoxide concentration in the indoor space is less than the predetermined concentration δ (No in step 58), the accumulated time of the failure detection timer is confirmed, and whether the accumulated failure detection timer time is equal to or greater than the predetermined time β. Confirm (step 59).
If the failure detection timer integration time is greater than or equal to the predetermined time β (Yes in step 59), the process proceeds to step 67, where the failure detection timer and the density calculation timer are reset.
On the other hand, if the failure detection timer integration time is less than the predetermined time β (No in step 59), the process returns to step 53.

When the basic combustion operation is stopped (No in step 54), the failure detection timer is temporarily stopped (step 60).
Thereafter, density division processing similar to that of the first embodiment is performed (step 61).
Then, assuming that carbon monoxide is discharged from the indoor space to the outside of the indoor space, the expected carbon monoxide concentration in the indoor space after a predetermined time after stopping the combustion operation is calculated using the above formula (2a). ) (Step 57).

  In Step 53, when it is determined that the neutralizer 10 is in the water seal state (Step 53 is Yes), the failure detection timer and the concentration calculation timer are reset (Step 69), and the water seal control operation is performed. finish. That is, as long as the water seal state does not always collapse, the basic combustion operation can be performed.

  In the water seal control operation of the heat source apparatus of the present embodiment, when the assumed carbon monoxide concentration in the indoor space is equal to or higher than the predetermined concentration δ, the basic combustion operation is performed using natural ventilation in the indoor space. Since it is possible to reduce the concentration of the combustion gas in the space or the concentration of the specific gas, the deterioration in usability is suppressed, and the concentration of the combustion gas in the space or the concentration of the specific gas is unlikely to reach a predetermined concentration. .

In the third embodiment described above, the combustion amount is simply limited in the combustion limiting operation, but the present invention is not limited to this. As an application example, the structure of the heat source unit 1 will be described in the case where two systems of heat exchangers are arranged in one case.
The inlet of the drain recovery unit 21 to the drain introduction pipe 23 is provided on the hot water supply circuit 7 side of the secondary heat exchanger 6 (see FIG. 3). Therefore, if the combustion gas flows into the indoor space, there is a high possibility that the combustion gas flows into the indoor space mainly from the hot water supply circuit 7 side. Therefore, in the combustion limiting operation, when the burner 12 of the hot water supply combustion section 2a is controlled (when the number of combustion is reduced), the combustion pipe near the drain recovery port of the burner 12 of the hot water combustion section 2a is extinguished. Is preferred. This combustion restriction operation increases the ratio of air on the hot water supply circuit 7 side of the secondary heat exchanger 6 (the inlet side to the drain introduction pipe 23 of the drain recovery unit 21), so that the inflow of combustion gas into the indoor space The concentration is reduced, and the indoor space can be less polluted.

  In the third embodiment described above, the restriction range of the combustion amount is made uniform in each basic combustion operation in the combustion restriction operation, but the present invention is not limited to this, and the combustion amount is controlled depending on the type of basic combustion operation. The limit width may be changed.

  In the above embodiment, the water seal control operation is performed based on the carbon monoxide concentration. However, the present invention is not limited to this, and the water seal control operation may be performed based on the combustion gas concentration. The water seal control operation may be performed based on the concentration of other gas generated from the combustion gas such as carbon dioxide.

  In the above-described embodiment, the carbon monoxide concentration was determined based on the pressure blocked to the combustion limit and the combustion output, but the present invention is not limited to this, and the carbon monoxide concentration is, for example, that of a flame. The length may be detected and calculated, or may be obtained from the closing pressure of the blower 15.

1 Heat source machine 2 Combustion section 6 Secondary heat exchange section (heat exchanger)
10 Neutralizer 30 Water detection means

Claims (3)

A combustion section, a combustion gas passage through which combustion gas generated in the combustion section circulates, a heat exchanger provided in a part of the combustion gas passage and mainly recovering latent heat of the combustion gas, and the heat exchanger A heat source machine having a neutralizer for neutralizing drain water generated when heat is exchanged at
The neutralizer is configured to prevent a gas from passing through when a certain amount of drain water accumulates, and the neutralizer includes water detection means capable of detecting the presence or absence of drain water. Have
One of the conditions that there is drain water in the neutralizer is that the combustion part can burn,
When there is no drain water in the neutralizer, it is assumed that a part of the combustion gas is discharged to the outside through the neutralizer by burning the combustion section, and the external combustion gas concentration at that time or A heat source machine characterized in that a combustion part can be burned only during a time period until the concentration of a specific gas is calculated and the concentration of the combustion gas or the concentration of the specific gas reaches a predetermined concentration or more.   The combustion part starts combustion, calculates the concentration of the external combustion gas or the concentration of a specific gas, and limits the amount of combustion in the combustion part according to the result. The heat source machine described.   The concentration of the discharged combustion gas or the specific gas is obtained by using a correlation between the combustion time in the combustion operation and the stop time in which the combustion operation is stopped, and a multiplication process of the concentration calculated from the combustion time; The heat source unit according to claim 1, wherein the heat source unit is calculated by a concentration division process calculated from the stop time.

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