JP5880943B2 - Combustion equipment - Google Patents

Description

  The present invention relates to a latent heat recovery type combustion apparatus equipped with a neutralizer for neutralizing drain, and more particularly to a combustion apparatus equipped with an automatic water injection function to the neutralizer.

  In recent years, in order to improve the heat exchange efficiency of heat generated when a burner is burned, a latent heat recovery type combustion apparatus that recovers even the latent heat of combustion gas has become widespread in the market. Since this latent heat recovery type combustion apparatus mainly recovers heat generated when water vapor in the combustion gas is liquefied, a heat exchanger (secondary heat exchanger) for recovering latent heat has a large amount of heat. Drain is generated. And it is known that this drain will show the acidity, the nitrogen oxide produced | generated at the time of combustion melt | dissolves.

  For this reason, this type of combustion apparatus has a drain discharge system that guides drain to the outside, and a neutralization device that neutralizes acidic drain is provided in the middle of the flow path. In other words, the acidic drain generated in the secondary heat exchanger is not discharged outside while maintaining its acidity, and is neutralized by the neutralizer and then discharged outside, which has a negative impact on the environment. There is no fear of effects.

  However, since the drain discharge system and the exhaust flow path of the combustion gas are in communication with each other, the combustion gas that should be discharged to the outside through the exhaust pipe of the combustion device is originally discharged to the outside through the drain discharge system. There was a concern of being discharged. In particular, in an indoor installation type combustion apparatus, when combustion gas is discharged from the drain discharge system, the combustion gas is released indoors in the living space, so from the viewpoint of the safety of residents, Such a defect was one of the items to be avoided.

  Therefore, as a countermeasure, the portion through which the combustion gas in the neutralizer vessel can pass is filled with drain to a predetermined water level and sealed, and the circulation of the combustion gas is forcibly blocked by the water sealing structure. Measures are generally adopted. In this type of combustion apparatus, water is supplied to the neutralizer by a worker or the like during a trial operation to form a water seal structure. Thus, conventionally, water supply performed to form a water-sealed structure in the neutralizer has been performed manually, but it is a troublesome operation for workers and the like, and there is a demand for omission. there were.

  Therefore, Patent Document 1 discloses a combustion apparatus in which a control device automatically supplies water to a neutralizer based on a detection signal of a water level electrode for water sealing provided in the neutralizer. Thereby, the operation | work which an operator supplies water to a neutralizer is abbreviate | omitted.

JP 2008-298367 A

  However, when adding control for supplying water to the neutralizer by automatic control as in Patent Document 1, a new signal terminal is required for the control device to perform the control. In the case where there is no space, it is necessary to change the design of the existing control device, which may increase the manufacturing cost.

  Therefore, in the present invention, in view of the problems of the prior art, even when there is no space in the signal terminal, the combustion device that can automatically control the water supply to the neutralizer without requiring a design change of the existing control device It is an issue to provide.

The invention according to claim 1, which is provided to solve the above-mentioned problems, includes a combustion section in which a combustion gas is generated by burning fuel, a heat exchanger that mainly recovers latent heat of the combustion gas, and a combustion gas Water having a structure that includes a neutralizer for neutralizing drain generated when the latent heat of the gas is recovered and a control means, and a gas cannot pass through when a predetermined amount of liquid is introduced into the neutralizer A combustion apparatus having a function of forming a seal and further including one or more members of the following electrical devices (1) to (4), wherein hot water supplied from a water supply source is led to a neutralizer. A water injection main flow path, and a branch flow path provided as necessary with respect to the water injection main flow path, a water injection possible valve is provided in the water injection main flow path, and an auxiliary on-off valve is provided in the branch flow path, The control means shares a signal for starting and stopping the electric device, Or combustion apparatus, characterized in that for opening and closing the auxiliary switching valve.
(1) A fuel valve that regulates the flow of fuel,
(2) A valve for liquid that regulates the flow of hot water or heat medium heated directly or indirectly in the heat exchanger,
(3) a blower for supplying combustion air;
(4) A pump that forms a flow of hot water or a heat medium.

Here, the main timing required for pouring water into a general neutralizer will be described. The timing is to prevent freezing at the time of a test operation performed when the combustion apparatus is installed or after the test operation. For example, after forcibly draining the liquid in the neutralizer. More specifically, these timings are before the execution of the combustion operation, even during a trial operation or after forced drainage. That is, at this timing, when water is injected into the neutralizer, a fuel valve, a liquid valve, a blower, or a pump (hereinafter collectively referred to as an existing device) which is an electric device unrelated to the implementation. Even if one of these is operated simultaneously, there is almost no influence to the extent that the combustion apparatus and the equipment (for example, a currant or a heating terminal) related to the combustion apparatus cause problems.
Therefore, the combustion apparatus of the present invention is configured to control water injection to the neutralizer by sharing a signal for starting / stopping any of the existing equipment with the water injection enabling valve and the auxiliary on-off valve. That is, the combustion apparatus of the present invention has a configuration that can open and close the water-injectable valve and the auxiliary on-off valve by a signal for starting and stopping the existing equipment. Thereby, even if it is a case where a terminal runs short in a control apparatus, it becomes possible to add the automatic water pouring function to a neutralizer, without newly providing a shortage terminal.

By the way, as described above, the main timing for water injection to the neutralizer is that the water level of the liquid in the neutralizer is not secured so that a water seal can be formed. After draining. Therefore, after the liquid level in the neutralizer is sufficiently secured so that a water seal can be formed, the water injection operation to the neutralizer is basically unnecessary. In consideration of such a situation, if a signal that contributes to the control of the fuel valve or the blower directly related to the combustion operation is shared by the water injection valve, the water injection operation is continued even after the water seal is formed. There is a risk that this will occur. In addition, the pump is not a device directly related to the combustion operation like the fuel valve or the blower, but basically operates in conjunction with the combustion operation, and thus is similar to the fuel valve or the blower. It is not preferable to share the signal that contributes to the control of the pump with the irrigable valve.
On the other hand, the thermal valve in the heating system, which is a liquid valve, restricts the flow of hot water or heat medium in the terminal circulation path, and is controlled as necessary. Therefore, with this type of thermally operated valve, even if a signal is shared with respect to the water-pourable valve, the above-described disadvantage does not occur.
Therefore, from the viewpoint of not hindering the normal operation of the combustion apparatus, the water-injectable valve is a liquid valve in the existing equipment, and is configured to control synchronously with a thermal valve provided in the heating system. Is most preferred.
Therefore, the invention according to claim 2 has at least two combustion systems, at least one of which is a heating system, and hot water or a heat medium circulates between the heat exchanger and at least the heating terminal in the heating system. The terminal circulation path is provided with a thermal valve that is the liquid valve, and the water pouring valve and / or the auxiliary on-off valve share a signal for starting and stopping the thermal valve. It is set as the combustion apparatus of Claim 1 characterized by the above-mentioned.

  According to such a configuration, since the signal for starting and stopping the thermal valve in the heating system is shared by the signal for controlling the water pourable valve, as described above, it is not directly related to the combustion operation. In addition, there is no possibility of causing a problem that the water injection operation is wasted after the water seal is formed.

Here, in the case where hot water or a heat medium is circulated in a terminal circulation path having a high temperature terminal path and a low temperature terminal path, a bypass flow path that normally connects the high temperature terminal path and the low temperature terminal path is provided. A heating side bypass thermal valve is provided in the bypass flow path. And this heating side bypass thermal valve is controlled when performing a low temperature heating operation in which hot water or a heat medium is supplied to the low temperature side terminal to increase the flow rate flowing to the primary heat exchanger and improve the heat output. Established. However, it is not necessary to keep it open at all times, and even if it is temporarily closed, the low temperature heating performance is hardly adversely affected. On the other hand, in states other than low-temperature heating operation, that is, in high-temperature heating operation, other operations, or in a shutdown state, the heating side bypass thermal valve is always closed. Almost no adverse effect.
As described above, the heating side bypass thermal valve does not need to be constantly opened even in the low temperature heating operation particularly required, and even if the water pouring valve is controlled to be closed synchronously at the time of heating replenishment, it is inconvenient at the low temperature side terminal. It will not cause. Similarly, if it is time to activate the water pouring valve during high-temperature heating operation, the temperature of the hot water or heat medium may decrease due to the opening of the heating side bypass thermal valve. Therefore, there is no inconvenience at the high temperature side terminal.
Therefore, in the invention according to claim 3, the terminal circulation path circulates the hot water or the heat medium between the high temperature terminal path through which the hot water or the heat medium circulates between the high temperature side terminal and the low temperature side terminal. A low-temperature terminal path is provided, and a bypass thermal valve is provided between the high-temperature terminal path and the low-temperature terminal path to regulate the flow of hot water or a heat medium from the high-temperature terminal path side to the low-temperature terminal path side. 3. The combustion apparatus according to claim 2, wherein the auxiliary on-off valve shares a signal for starting and stopping the bypass thermal valve.

  According to such a configuration, the water injection enabling valve is controlled in synchronism with the bypass heat operated valve arranged in the terminal circuit, and therefore, as described above, even during the combustion operation, there is a timing that requires water injection to the neutralizer. Even if it arrives, there is almost no risk of causing inconvenience in the combustion operation and the equipment related to the operation.

  In the combustion apparatus of the present invention, it is desirable that the terminal circulation path is provided with an expansion tank that absorbs a volume change accompanying a temperature change of hot water or a heat medium, and the branch flow path is a flow path that reaches the expansion tank. (Claim 4)

In the invention according to claim 5, the water-injectable valve is provided at a branch point between the water-injection main channel and the branch channel or a water-injection main channel downstream of the branch point, and upstream of the water-injectable valve. The combustion apparatus according to any one of claims 1 to 4, wherein an upstream side valve is provided, and the upstream side valve is opened and closed by a signal different from that of the water pourable valve.
The “upstream valve” referred to here is one of liquid valves provided in the middle of the branch flow path that normally reaches the expansion tank, and does not require a new control signal.

  According to such a configuration, the upstream valve is provided in the flow path leading to the water pourable valve, and the upstream valve is controlled by a signal different from that of the water pourable valve, so that only the water pourable valve is activated. In this case, hot water is not poured into the neutralizer. As a result, as described above, even when the water injection operation is performed in conjunction with the existing equipment when the water injection to the neutralizer is not required, Water injection into the neutralizer will not start unless it is activated. Therefore, according to the present invention, if both the upstream side valve and the irrigable valve are not operated, the irrigation flow path to the neutralizer is not opened, and even if only one valve is activated, the irrigation operation is performed. Since it is not started, useless water injection by signal sharing can be prevented in advance.

  The invention according to claim 6 is the combustion apparatus according to claim 5, wherein, when water is injected into the neutralizer, the upstream valve is opened after the water-injectable valve is completely opened.

  According to such a configuration, since the water injection possible valve provided downstream from the upstream valve is completely opened, the upstream valve is opened, so that when the upstream valve is opened, water pressure is applied to the water injection possible valve. It can prevent overhanging. Thereby, it can prevent that the water injection possible valve causes the damage resulting from water pressure.

  The invention according to claim 7 is characterized in that the auxiliary opening / closing valve is controlled to open and close by the same signal as the water pourable valve, and is always opposite to the open / closed state of the water pourable valve. The combustion apparatus according to any one of 6.

  According to such a configuration, the auxiliary on-off valve that regulates the flow of water to the expansion tank side and the water injection enable valve that regulates the flow of water to the neutralizer side are always in the open / closed state, and both of them are Since the same signal is shared, there can be no problem that hot water flows unintentionally to the other side when water is supplied to the neutralizer or water is supplied to the expansion tank, and water is supplied or supplied. Thereby, in a neutralizer, it can prevent that a neutralizing agent etc. dilute, and when an antifreeze liquid is used in an expansion tank, the dilution of an antifreeze liquid can be prevented.

  In the invention according to claim 8, the neutralizer is provided with an electrode for detecting a liquid water level, and when the electrode does not detect the water level after pouring water into the neutralizer, the control device The combustion apparatus according to any one of claims 5 to 7, wherein it is determined that the water-injectable valve and / or the upstream valve has failed.

  According to such a configuration, even if water is injected into the neutralizer, if the electrode cannot detect the water level, it is determined that the irrigable valve or the upstream valve has failed. If reflected, the maintenance worker can easily determine the repair location.

  The invention according to claim 9 is based on the branch point of the water injection main channel and the branch channel, and the narrow opening area in the water injection main channel downstream of the branch point is in the branch channel downstream of the branch point. The combustion apparatus according to claim 1, wherein the combustion apparatus is smaller than a narrow opening area.

  According to such a configuration, the flow resistance of the hot water of the water injection main flow path is higher than that of the branch flow path due to the narrow opening area. For this reason, even if the situation where hot water flows through both the water injection main flow channel and the branch flow channel occurs, the amount of water flow through the water injection main flow channel is smaller than that of the branch flow channel, and at an unnecessary timing. The amount of water injected into the neutralizer can be regulated in advance to be reduced.

  In the combustion apparatus of the present invention, a water injection enabling valve or auxiliary on-off valve that regulates water injection to the neutralizer shares a signal for starting / stopping existing equipment, so a new terminal is provided in the existing control device It is possible to add an automatic water injection function to the neutralizer.

It is an operation principle figure showing a combustion device concerning a first embodiment of the present invention. It is explanatory drawing which shows the high temperature terminal path | route of the combustion apparatus of FIG. It is explanatory drawing which shows the low temperature terminal path | route of the combustion apparatus of FIG. It is explanatory drawing which shows the bath heating path | route of the combustion apparatus of FIG. (When heating side bypass thermal valve is closed) It is explanatory drawing which shows the drain discharge system | strain of the combustion apparatus of FIG. (A) is explanatory drawing which shows the minimum water level in which a water seal structure is formed in a neutralizer, (b) is explanatory drawing which shows the state by which the drain stored by the neutralizer is drained. (Hatched: liquid, arrow: combustion gas flow) It is a conceptual diagram which shows typically the relationship between each valve and the control apparatus in the principal part of the combustion apparatus of FIG. It is a flowchart which shows the automatic water injection operation | movement of the combustion apparatus of FIG. It is an operation principle figure which shows the combustion apparatus which concerns on 2nd embodiment. It is a conceptual diagram which shows typically the relationship between each valve and the control apparatus in the principal part of the combustion apparatus of FIG. It is an operation principle figure which shows the combustion apparatus which concerns on 3rd embodiment. It is a conceptual diagram which shows typically the relationship between each valve and the control apparatus in the principal part of the combustion apparatus of FIG.

Hereinafter, the combustion apparatus 1 which concerns on this embodiment of this invention is demonstrated.
The combustion apparatus 1 of this embodiment is characterized in that a function for automatically pouring hot water supplied from a water supply source can be added to a neutralizer 14 that neutralizes drain without newly installing a terminal of the control apparatus 2. Most of the other parts are latent heat recovery type heat source machines having a configuration similar to that of a known one.

Therefore, first, a portion similar to the known one in the combustion apparatus 1 will be briefly described.
As shown in FIG. 1, the combustion apparatus 1 has two independent combustion systems, specifically, a hot water supply side combustion system on the right side and a bath / heating side combustion system on the left side, and further controls operations related to combustion. A control device 2 is provided.
The hot water supply side combustion system includes a hot water supply side combustion unit 7 that burns fuel to generate combustion gas, a known hot water supply side blower 9 that blows combustion air to the hot water supply side combustion unit 7, and hot water or a heat medium. Is provided with a hot water supply side heat exchanging portion 11 that is circulated and heated by combustion gas, and a hot water supply running water system 20. Similarly, the bath / heating side combustion system includes a bath / heating side combustion portion 8 and its bath / heating side. A bath / heating-side blower 10 that blows air to the combustion unit 8, a bath / heating-side heat exchange unit 12, a heating / flowing water system 21, a reheating / flowing water system 22, and a drain discharge system 13 are provided.

  Each combustion unit 7, 8 is provided with a plurality of burners 40 for burning fuel gas, and a fuel pipe 41 for connecting the fuel gas to the burner 40 is connected. The fuel pipe 41 is bifurcated in the middle, and an original gas solenoid valve (fuel valve) 42 is provided upstream from the branch point, and reaches each burner 40 downstream from the branch point. A proportional valve (fuel valve) 43 and a solenoid valve (fuel valve) 44 for restricting the flow of the fuel gas are provided. That is, in each of the combustion sections 7 and 8, the opening and closing of the fuel valves 42, 43 and 44 are controlled, and the fuel gas supplied through the fuel pipe 41 is burned by the burner 40 to generate combustion gas. The

  The hot water supply water system 20 is partly formed by the hot water supply side heat exchange unit 11, and the hot water supplied from the water supply source flows to the hot water supply side heat exchange unit 11, and the hot water supply side heat exchange unit 11 performs a curan or the like. And a hot water supply side bypass flow path 25 that bypasses the hot water supply side heat exchange section 11. In the hot water supply water system 20, the hot water supply side bypass flow rate adjustment valve (liquid valve) 26 that adjusts the flow rate passing through the hot water supply side bypass passage 25, or the hot water flow rate is reduced when the hot water temperature is lower than a predetermined value. A hot water flow rate adjusting valve (liquid valve) 27 and the like are provided.

Further, the hot water supply water system 20 is provided with a bath dropping channel 28 branched from the hot water flow channel adjusting valve 27 and leading the hot water to the bath tub. The bath dropping flow path 28 is provided with a pouring electromagnetic valve (liquid valve) 30 for restricting the water flow to the bathtub, a backflow prevention mechanism 31 for preventing the backflow of the water flow from the bathtub side, and the like. .
The hot water supply side heat exchanging section 11 includes a primary heat exchanger 11a that mainly recovers sensible heat of the combustion gas, and a secondary heat exchanger 11b that mainly recovers latent heat of the combustion gas.

The heating / running water system (terminal circulation path) 21 is partly formed by the bath / heating-side heat exchange unit 12, and the hot water is the bath / heating-side heat exchange unit 12 shown in FIG. Circulates between the high-temperature terminal path 32 that circulates between the high-temperature side terminals (not shown) and the low-temperature side terminals (not shown) such as the bath / heating-side heat exchanger 12 shown in FIG. 3 and floor heating. Circulates the low temperature terminal path 33, the heating side bypass flow path 34 connecting the high temperature terminal path 32 and the low temperature terminal path 33, and the bath heating path 35 for heating hot water flowing through the reheating water system 22 described later shown in FIG. To do. The heating-side bypass flow path 34 is a shaded portion in FIG.
And in the heating running water system 21, the heating side pump 36 which forms the circulating flow of hot water, the expansion tank 37 which suppresses the pressure rise accompanying the expansion of the volume resulting from the temperature change of hot water, or the pressure drop accompanying shrinkage, A header thermal valve (liquid valve) 38 that feeds hot water toward the low temperature side terminal, a heating side bypass thermal valve (liquid valve) 39 provided on the heating side bypass flow path 34, and a bath heating path 35 A bath-side thermal valve (liquid valve) 45 that regulates the flow of water to the water and a liquid / liquid heat exchanger 46 that performs heat exchange between hot water flowing through the reheating water system 22 described later are provided. .
The bath / heating-side heat exchanger 12 includes a primary heat exchanger 12a that mainly recovers sensible heat of the combustion gas, and a secondary heat exchanger 12b that mainly recovers latent heat of the combustion gas. .

  In the reheating water system 22, the liquid / liquid heat exchanger 46 forms a part thereof, and hot water in the bathtub is provided between the liquid / liquid heat exchanger 46 and a bath tub (not shown). A circulation channel 47 that circulates is provided. The reheating channel 47 is provided with a retreating side pump 48 that forms a circulating flow of hot water. Note that the above-described bath dropping channel 28 is connected to the reheating channel 47.

  The drain discharge system 13 is a flow path for draining the drain generated when recovering the latent heat of the combustion gas to the outside after neutralizing by the neutralizer 14. That is, as shown in FIG. 5, the drain discharge system 13 includes a neutralizer introduction flow path 15, a neutralizer 14, and a neutralizer 14 from the secondary heat exchangers 11 b and 12 b to the neutralizer 14. It is comprised with the external discharge flow path 16 of the downstream side.

Here, it adds about the neutralizer 14 in this embodiment.
As described above, combustion gas may be unintentionally introduced into the neutralizer. In particular, in an indoor installation type combustion apparatus, if the combustion gas passes through the neutralizer and flows downstream, it must be avoided because it is discharged indoors.
Therefore, as shown in FIG. 6A, the neutralizer 14 in the present embodiment is a water-sealed structure that blocks the combustion gas flow path in the drain discharge system 13 by the drain introduced into the neutralizer 14. Is formed. That is, the neutralizer 14 is provided with a drain passage opening 50 on the bottom side, a discharge port 51 through which drain is discharged at a position higher than the upper edge of the opening 50, and a water seal is formed by the drop. This is a configuration. And in this embodiment, in order to detect the presence or absence of the water seal structure, a water seal electrode 52 is provided, and as shown in FIG. 6A, if at least the tip of the water seal electrode 52 is immersed, It is judged that there is a water seal, and combustion is possible. On the contrary, if water sealing is not confirmed by the water sealing electrode 52, an error is displayed on the controller or the like, and the combustion becomes impossible. Then, as shown in FIG. 6B, the drain that has passed through the opening 50 is discharged from the discharge port 51 for the first time when it reaches the height of the discharge port 51.
Thus, in the combustion apparatus 1 of the present embodiment, the neutralizer 14 can neutralize the drain generated in the secondary heat exchangers 11b and 12b and discharge it to the outside. Combustion gas that has flowed into the discharge system 13 can be prevented from flowing out by the water-sealed structure formed by the neutralizer 14.

Subsequently, the basic operation of the combustion apparatus 1 of the present embodiment will be described.
The basic operation of the combustion apparatus 1 includes a hot water supply operation, a heating operation, a bath drop-in operation and a reheating operation, all of which are the same as known ones.
Briefly described below.

In the hot water supply operation, if a calorie or the like is operated and there is a hot water discharge request, the hot water supply side heat exchange unit 11 is heated by the combustion gas generated in the hot water supply side combustion unit 7 and hot water at a desired temperature is discharged from the curan or the like. The
Heating operation is based on the high temperature heating operation that circulates hot water in the bathroom heating of the bath (high temperature side terminal) and the temperature of the low temperature hot water (hot water that circulates in the high temperature side terminal). There is also a low-temperature heating operation that circulates low temperature). That is, in the high-temperature heating operation, the bath / heating-side heat exchange unit 12 is heated by the combustion gas generated in the bath / heating-side combustion unit 8, and high-temperature hot water is circulated to the high-temperature side terminal via the high-temperature terminal path 32. In the low-temperature heating operation, the bath / heating-side heat exchange unit 12 is heated by the combustion gas generated in the bath / heating-side combustion unit 8, and low-temperature hot water is circulated to the low-temperature side terminal via the low-temperature terminal path 33. Is done.
In the reheating operation, if the temperature of the hot water in the bathtub is lower than a predetermined temperature or if there is a request for reheating operation by a remote controller or the like, the hot water in the bathtub is set to the set temperature via the liquid / liquid heat exchanger 46. Heat until. More specifically, in the reheating operation of the present embodiment, the bath / heating-side heat exchange unit 12 is heated by the combustion gas generated in the bath / heating-side combustion unit 8, and the heat passes through the heating / flowing water system 21. Indirectly, it is transmitted to the reheating channel 47 to heat the hot water in the bathtub.
The bath drop-in operation is different only in the method of requesting hot water (request through a remote controller or the like), and an operation substantially similar to the hot water supply operation is performed, and thus the description thereof is omitted.

Next, the characteristic part of the combustion apparatus 1 of this embodiment is demonstrated.
The combustion apparatus 1 of the present embodiment is provided with a function capable of automatically pouring hot water supplied from a water supply source into the neutralizer 14 to form a water seal structure. That is, the combustion apparatus 1 performs water injection to the extent that a water seal is formed unless a predetermined water level is confirmed in the neutralizer 14 by the water seal electrode 52. Then, in order for the combustion device 1 to perform its function, as shown in FIG. 1, as shown in FIG. A side solenoid valve (upstream valve) 17 and a three-way valve (water-injectable valve) 5 having three ports are provided.

  More specifically, the water injection main flow path 3 is a flow path branched from the flow path from the water supply source to the hot water supply flow system 20, and the downstream end is connected to the neutralizer introduction flow path 15 that is a part of the drain discharge system 13. It is connected. That is, hot water flowing through the water injection main channel 3 is introduced into the neutralizer 14 after being introduced into the neutralizer introduction channel 15. In addition, the water injection main flow path 3 is provided with a three-way valve 5 and an upstream side electromagnetic valve 17 in order from the side close to the connection portion with the neutralizer introduction flow path 15. And the branch flow path 4 which guides hot water to the expansion tank 37 provided in the above-mentioned heating flowing water system 22 is connected to one port of the three-way valve 5. That is, if the port of the three-way valve 5 is switched so that the two ports communicate with the water injection main channel 3 (hereinafter referred to as a neutralizer communication state), hot water can be guided to the neutralizer 14, If the path 3 and the branch flow path 4 are in a state of communication (hereinafter referred to as an expansion tank communication state), hot water can be guided to the expansion tank 37.

  Moreover, in this embodiment, it is set as the structure which can add the automatic water pouring function to the neutralizer 14, without forming a new terminal in the control apparatus 2. FIG. That is, in the present embodiment, a signal generated through a terminal used to start / stop other existing electric devices is shared by the three-way valve 5 that is a water-injectable valve. Specifically, as shown in FIG. 7, the signal for controlling the opening and closing of the three-way valve 5, which is a water pourable valve, is shared with the signal for controlling the opening and closing of the heating side bypass thermal valve 39 in the heating and flowing water system 21. In other words, the heating-side bypass thermal valve 39 and the three-way valve 5 are configured to be opened and closed synchronously by one signal.

Subsequently, an operation when water is automatically poured into the neutralizer 14 will be described.
In the present embodiment, as described above, when it is determined that the water-sealed structure is not formed in the neutralizer 14, water is injected to such an extent that the water-sealed structure is formed in the neutralizer 14. Is called. That is, according to the flowchart of FIG. 8, it is confirmed in step 1 whether or not the water sealing electrode 52 is energized. And in step 1, if energization is not confirmed, opening / closing control of the upstream solenoid valve 17 provided in the water injection main flow path 3 and the three-way valve 5 which is a water injection possible valve is performed. That is, the process proceeds to step 2 where it is confirmed whether or not the flag is on. If the flag is off, then the process proceeds to step 3 to control the three-way valve 5 to the neutralizer communication state. More specifically, step 3 will be described. In the control device 2, a signal for opening the heating side bypass thermal valve 39 is generated. Then, the three-way valve 5 is controlled to be in a neutralizer communication state in synchronization with the opening of the heating side bypass thermal valve 39. In this way, when a certain time has elapsed after the three-way valve 5 is controlled and the port is completely in the neutralizer communication state (step 4), the upstream solenoid valve 17 is opened (step 5). Then, the process proceeds to step 6 until the flag is turned on and the neutralizer 14 reaches a predetermined water level, the three-way valve 5 and the heating side bypass thermal valve 39 and the upstream side solenoid valve 17 are A controlled state is maintained. And it returns to step 1 again and the energized state of the water sealing electrode 52 is confirmed. Thus, if energization in the water sealing electrode 52 is confirmed, the process proceeds to step 7 to confirm whether or not the flag is on. If the flag is on, the flag is turned off in step 8. . Then, it returns to step 1 and the monitoring of the water seal structure in the neutralizer 14 is implemented again.

  On the other hand, after the flag is turned on in step 6, if the energization state of the water sealing electrode 52 is not confirmed in step 1, the process proceeds to step 2. Then, after confirming that the flag is turned on in Step 2, the routine proceeds to Step 9 and a predetermined time (for example, 10 to 30 seconds) after the three-way valve 5 is controlled to be in the neutralizer communication state. It is confirmed whether it has passed. At this time, if the predetermined time has not elapsed, the process returns to step 1 and the same operation as described above is executed. On the contrary, if it is confirmed in step 9 that the predetermined time has elapsed, the hot water is not supplied into the neutralizer 14 even though the three-way valve 5 and the upstream solenoid valve 17 are controlled. to decide. That is, the process proceeds to step 10 to determine whether the three-way valve 5 or the upstream solenoid valve 17 has failed. In step 11, an error is notified to the remote controller or the like to disable the combustion operation.

  As described above, in the present embodiment, the signal generated to start and stop the existing electric device is shared by the three-way valve 5 that is a water-injectable valve that enables automatic water injection to the neutralizer 14. When adding the automatic water injection function, it is not necessary to make a design change such as newly installing a terminal in the control device 2. That is, even when the automatic water injection function to the neutralizer 14 is added, the control device of the existing combustion device can be utilized as it is, so that the manufacturing cost cannot be significantly increased. As a result, it is possible to provide an inexpensive combustion apparatus that has high functionality, particularly safety functionality.

In the said embodiment, although the three-way valve 5 was employ | adopted as a water injection possible valve and the signal which controls the heating side bypass thermal valve 39 was shown in the three-way valve 5, the present invention is not limited to this. In place of the three-way valve 5, as shown in FIG. 9, two electromagnetic valves, specifically, a water injection electromagnetic valve (water injection possible valve) 6 and a water supply electromagnetic valve (auxiliary on-off valve) 18 are adopted. As shown in FIG. 10, the configuration may be such that both the solenoid valves 6 and 18 share a signal for controlling the heating side bypass thermal valve 39 (second embodiment). More specifically, the combustion apparatus 1 according to the second embodiment maintains the open state without energization as one of the electromagnetic valves 6 and 18 (in this embodiment, the water injection electromagnetic valve 6). A normally-open solenoid valve is used, and a normally-closed solenoid valve that maintains a closed state in a non-energized state is used as the other solenoid valve (in this embodiment, a water refill solenoid valve 18). Provided in the main flow path 3, the water supplementary electromagnetic valve 18 is provided in the branch flow path 4. That is, according to this configuration, even if the solenoid valves 6 and 18 are controlled synchronously, only one solenoid valve is opened, so that hot water does not flow in an unintended direction. More specifically, when a water injection operation is started, hot water is circulated through the water injection main channel 3 and hot water is injected into the neutralizer 14. That is, only the upstream side solenoid valve 17 is controlled to open without being controlled for the water injection solenoid valve 6 that maintains the opened state in the absence of energization. In other words, when water is injected into the neutralizer 14 in this configuration, the control device 2 does not generate a signal for controlling the heating side bypass thermal valve 39, and accordingly, the water injection electromagnetic valve 6 and the water supply electromagnetic valve No opening / closing control 18 is performed. That is, the hot water is led to the neutralizer 14 without opening / closing control of the water injection electromagnetic valve 6 and the water replenishment electromagnetic valve 18. Conversely, when hot water is supplemented to the expansion tank 37, a signal for controlling the heating side bypass thermal valve 39 is generated, and the water injection solenoid valve 6 and the supplementary solenoid valve 18 are controlled to open and close.
As described above, the combustion apparatus 1 of the second embodiment is neutralized by sharing the signal for controlling the existing electrical equipment with the water injection electromagnetic valve 6 and the water replenishment electromagnetic valve 18 as in the first embodiment. Since automatic water injection to the vessel 14 can be performed, the same effect as described above can be expected.

In the first and second embodiments, in the water injection main flow path 3, in addition to the upstream side solenoid valve 17, the water injection possible valves 5 and 6 are provided, and the water injection possible valves 5 and 6 are controlled by the heating side bypass thermal valve 39. Although the configuration in which the signal is shared is shown, the present invention is not limited to this, and the upstream solenoid valve 17 is used as the water pouring valve without providing the water pouring valves 5 and 6 employed in the above-described embodiment, Further, the supplementary water solenoid valve 18 may be provided in the branch flow path 4 and the control signal of the heating side bypass thermal valve 39 may be shared by the supplementary water solenoid valve 18 (third embodiment). That is, in the combustion apparatus 1 of the third embodiment, if the upstream side electromagnetic valve 17 is controlled to be opened, water is always injected into the neutralizer 14 (water injection function by the upstream side electromagnetic valve 17). In addition, when the expansion tank 37 is refilled, in addition to the upstream solenoid valve 17, the refill water solenoid valve 18 is controlled to open, and the expansion tank 37 is refilled. That is, in this case, after the heating side bypass thermal valve 39 is controlled to open and close by the control device 2, the upstream side electromagnetic valve 17 is controlled to open and close. In this way, water injection to the neutralizer 14 and water replenishment to the expansion tank 37 are performed.
However, since the replenishing water to the expansion tank 37 and the flow path leading to the neutralizer 14 are kept open, water injection to the neutralizer 14 is performed unintentionally. Therefore, when this configuration is adopted, the flow resistance on the downstream end side of the water injection main flow path 3 is set to be higher than the flow resistance in the branch flow path 4 so that hot water can easily flow through the branch flow path 4. It is preferable that the structure be For example, the opening area on the downstream end side of the water injection main flow path 3 is made smaller than the opening area of the branch flow path 4, or a protrusion or the like that forms flow resistance is provided on the downstream end side of the water injection main flow path 3. Is mentioned. In addition, you may adapt the relationship of the channel resistance of this water injection main channel 3 and the branch channel 4 to any of above-mentioned embodiment.

  In the above embodiment, the three-way valve 5, the water injection electromagnetic valve 6, and the water replenishment electromagnetic valve 18, which are water-injectable valves, are configured to be controlled by sharing the signal of the heating side bypass thermal valve 39. However, the present invention is not limited to this, and any control signal may be used as long as it is a liquid valve, a fuel valve, a blower, and a pump that constitute the combustion apparatus 1. However, as described above, it is most preferable to use the heating side bypass thermal valve 39 from the viewpoint of the influence on the combustion operation and the like.

In the above embodiment, a configuration in which a flow path leading to the expansion tank 37 is employed as the branch flow path 4 is shown, but the present invention is not limited to this, and for example, the drop flow path 28 for dropping hot water into a bath tub is branched. It may be configured as a road.
Moreover, the water injection main flow path 3 may not be provided with the branch flow path 4 itself.

  Moreover, although the combustion apparatus 1 provided with two combustion systems was shown in the said embodiment, this invention is not limited to this, It is a combustion apparatus provided with only one combustion system, or three or more A combustion apparatus having a combustion system may be used. In particular, when such a configuration is employed, it is preferable to include a heating system.

DESCRIPTION OF SYMBOLS 1 Combustion apparatus 2 Control apparatus 3 Water injection main flow path 4 Branch flow path 5 Three-way valve (water injection possible valve)
6 Solenoid valve for water injection (water injection possible valve)
8 Heating side combustion section 12 Heating side heat exchange section 14 Neutralizer 15 Neutralizer introduction flow path 17 Upstream solenoid valve 18 Solenoid solenoid valve (auxiliary on-off valve)
37 Expansion tank 39 Heating side bypass thermal valve (Bypass thermal valve)
52 Electrode for water seal

Claims (9)

Combustion unit that generates combustion gas by burning fuel, heat exchanger that mainly recovers latent heat of the combustion gas, and neutralizer that neutralizes drain generated when the latent heat of the combustion gas is recovered And a control means, and has a function of forming a water seal as a structure in which gas cannot pass when a predetermined amount or more of liquid is introduced into the neutralizer, and the following (1) to (4) A combustion apparatus having one or more members of the electrical equipment of
A water injection main channel through which hot water supplied from a water supply source is led to the neutralizer, and a branch channel provided as necessary to the water injection main channel,
The water injection main flow path is provided with a water injection enable valve, and the branch flow path is provided with an auxiliary on-off valve.
The control means is configured to open and close the irrigable valve and / or the auxiliary on-off valve by sharing a signal for starting and stopping the electric device.
(1) A fuel valve that regulates the flow of fuel,
(2) A valve for liquid that regulates the flow of hot water or heat medium heated directly or indirectly in the heat exchanger,
(3) a blower for supplying combustion air;
(4) A pump that forms a flow of hot water or a heat medium. Having two or more combustion systems, at least one of which is a heating system;
The heating system is provided with a terminal circulation path through which hot water or a heat medium circulates between the heat exchanger and at least the heating terminal, and the terminal circulation path is provided with a thermal valve serving as the liquid valve,
The combustion apparatus according to claim 1, wherein the water injection enabling valve and / or the auxiliary on-off valve share a signal for starting and stopping a thermal valve. The terminal circulation path includes a high temperature terminal path through which hot water or a heat medium circulates between the high temperature side terminals and a low temperature terminal path through which the hot water or a heat medium circulates between the low temperature side terminals. Between the path, a bypass-side thermal valve that regulates the flow of hot water or heat medium from the high temperature terminal path side to the low temperature terminal path side is provided,
The combustion apparatus according to claim 2, wherein the water injection enabling valve and / or the auxiliary on-off valve share a signal for starting and stopping the bypass side thermal valve.   The terminal circulation path is provided with an expansion tank that absorbs a volume change accompanying a temperature change of hot water or a heat medium, and the branch flow path is a flow path to the expansion tank. The combustion apparatus as described.   The water-injectable valve is provided at the branch point between the water-injection main channel and the branch channel or the water-injection main channel downstream from the branch point, and the upstream valve is provided upstream from the water-injectable valve. The combustion apparatus according to any one of claims 1 to 4, wherein the upstream side valve is opened and closed by a signal different from that of the water pourable valve.   The combustion apparatus according to claim 5, wherein, when water is injected into the neutralizer, the upstream valve is opened after the water-injectable valve is completely opened.   The combustion apparatus according to any one of claims 1 to 6, wherein the auxiliary opening / closing valve is controlled to be opened / closed by the same signal as the water pourable valve, and is always opposite to the open / closed state of the water pourable valve. . The neutralizer is provided with an electrode that detects the liquid level,
6. The control device determines that the water-injectable valve and / or the upstream-side valve has failed when the electrode does not detect the water level after injecting water into the neutralizer. The combustion apparatus according to any one of 7.   Based on the branch point of the water injection main channel and the branch channel, the narrow opening area in the water injection main channel downstream from the branch point is smaller than the narrow opening area in the branch channel downstream from the branch point The combustion apparatus according to any one of claims 1 to 8.

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