JP6536060B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus.

  There is known a configuration in which a combustion device such as a water heater is provided with an alarm (CO alarm) that detects carbon monoxide and warns according to the concentration or the like (see, for example, Patent Document 1). In order to make sure that such an alarm operates properly, the combustion apparatus performs a disconnection determination process to determine the presence or absence of a disconnection of the alarm based on the input voltage input from the alarm to the control unit of the water heater. Configured to be executable.

  Also, depending on the type of combustion device, such an alarm may be externally attached as an optional device that can be selected optionally. As described above, it is necessary to execute the disconnection determination process at the time of connection of the alarm even in the combustion apparatus to which the alarm can be externally attached, but it is necessary to distinguish between the state in which the alarm is not connected and the state in which the alarm is disconnected. Will occur.

  In this connection, in the conventional configuration, for example, the circuit for detecting the connection of the alarm is short-circuited at the time of shipment of the combustion device, and if it is selected to connect the alarm as an accessory, specialized installation. At the time of construction of the combustion device, a person opens the short circuit part and connects the output voltage line and the reference voltage line (ground line etc.) of the alarm device to the control unit of the combustion device.

Japanese Patent Application Laid-Open No. 7-208244

  However, depending on the specific country or region, the construction of the combustion apparatus may be performed by a user or a proxy instead of a specialized installer. In such a case, in a conventional combustion apparatus to which a conventional alarm can be attached, proper construction may not be performed in the above-mentioned conventional construction mode, and the combustion apparatus and the alarm can be operated normally. There are cases where it can not be done.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a combustion apparatus capable of appropriately connecting an alarm without complicated operations when installing the combustion apparatus. I assume.

  A combustion apparatus according to an aspect of the present invention is a combustion apparatus to which an alarm that detects and warns of carbon monoxide can be connected, and a control unit, and a connection unit that connects the control unit and the alarm. A storage unit storing connection status of the alarm, the control unit indicating that the alarm is connected to the storage when the alarm is connected to a connection unit; Configured to store data.

  According to the above configuration, information on whether the alarm device is in the connected state or not connected is stored in the storage unit. Then, as the alarm is connected to the connection unit, data indicating that the alarm is connected is stored in the storage unit. For this reason, the builder can automatically recognize that the alarm has been connected by simply connecting the alarm to the connection of the combustion device. Therefore, even a builder who does not have specialized knowledge can properly connect the alarm without performing complicated work when installing the combustion apparatus.

  The alarm has an output voltage line for generating an output voltage and a reference voltage line for generating a reference voltage, and is configured to communicate the state of the alarm to the combustion device with the value of the output voltage with respect to the reference voltage. The connection portion is connectable to the output voltage line of the alarm device and the input terminal of the control unit, and is connectable to the reference voltage source in the combustion apparatus, the control When the input voltage input to the input terminal is equal to or higher than a predetermined first voltage, the unit determines that the alarm is in the connection state, and the alarm is in the connection state in the storage unit. And the alarm device is configured to output a voltage such that an input voltage input to the input terminal is equal to or higher than the first voltage when connected to the connection unit. It may be done. According to this, based on the input voltage input to the input terminal of the control unit by the alarm being connected to the connection unit, the control unit stores data indicating that the alarm is in the connected state in the storage unit. Therefore, simply by connecting the alarm, data indicating that the alarm is in the connected state can be reliably stored in the storage unit.

  The alarm device outputs an alarm signal having a voltage such that an input voltage input to the input terminal is in a predetermined voltage range larger than the first voltage according to the detected concentration of carbon monoxide. It may be configured to According to this, it is possible to transmit the detection signal of carbon monoxide in the alarm and the signal indicating the connection state of the alarm through the same signal line. In other words, by using the signal line voltage for outputting the detection signal as the connection signal indicating the connection state of the alarm, the control unit for the connection of the alarm without changing the configuration of the existing alarm Can be determined reliably.

  The control unit determines that the alarm is broken when the input voltage input from the alarm to the input terminal is equal to or higher than the first voltage and outside the voltage range defined as the detection signal. You may According to this, the failure determination of the alarm device can be performed based on the input voltage input to the input terminal of the control unit.

  The control unit determines that the connection path between the alarm unit and the control unit is disconnected when the input voltage input from the alarm unit to the input terminal is less than the first voltage. If the data stored in the storage unit is data indicating that the alarm device is in a connected state, the disconnection determination process may be determined to be valid. According to this, since the disconnection determination process is effective only when the alarm device is in the connected state, it is not necessary to separately determine whether the result in the disconnection determination process is due to the disconnection of the alarm device. Therefore, it is possible to further simplify the work of connecting the alarm device to the connection portion of the combustion device and putting the disconnection determination process into the execution state.

  The data processing apparatus may further include a first operation unit operable to change data stored in the storage unit indicating that the alarm device is in the connected state to data indicating that the alarm device is in the disconnected state. According to this, when the alarm is no longer needed, or when the alarm is not properly operated due to a failure, the control unit invalidates the signal from the alarm after the alarm is actually removed. Can be As a result, it is possible to prevent erroneous determination as disconnection.

  The alarm device is configured to be able to transmit a predetermined signal to the control unit, and the combustion device is switched between enabling and disabling alarm device information based on the signal from the alarm device. , And the storage unit stores data indicating whether to make the alarm information valid or invalid based on the switching operation by the second operation unit, and the control unit Is the alarm when a signal from the alarm is input to the control unit in a state in which the alarm is in a connected state and data indicating that the alarm information is to be validated is stored. The determination as to whether to prohibit the combustion in the combustion device may be performed based on the information. According to the above configuration, in addition to the state as to whether or not the alarm is connected, the state as to whether or not the alarm information is made valid is stored in the storage unit. Thus, for example, the connection of the alarm whether or not the control unit determines whether to inhibit the combustion in the combustion device based on the alarm information such as alarm information indicating that the concentration of carbon monoxide is high It can be set separately from the presence or absence. Thus, for example, when the alarm is in a failure state, the control of the combustion device based on the alarm can be nullified without removing the alarm.

  The combustion apparatus includes a notification unit, and the control unit notifies a warning by the notification unit when data indicating that the alarm device is in a connected state and the alarm information is invalidated is stored. Control may be performed so as not to determine whether to prohibit the combustion in the combustion apparatus based on the alarm information. According to this, when the alarm is in the connected state and the alarm information is invalidated, it is not determined whether to prohibit the combustion in the combustion device based on the alarm information. Under the present circumstances, since it will be in the state which does not function, although the alarm is seemingly connected, the user is made to recognize that the alarm is not functioning by giving alert notification from an alerting | reporting part. it can.

  The control unit stores data indicating that the alarm information is to be validated along with data indicating that the alarm is in a connected state in the storage unit when the alarm is connected to the connection unit. It may be configured as follows. As a result, when connecting the alarm to the connection of the combustion apparatus, it is possible to save time and effort to switch the alarm information to be effective, and although the alarm is connected, the combustion apparatus based on the alarm can be It is possible to prevent the occurrence of a state in which the control does not function. Therefore, appropriate construction can be easily performed.

  The second operation unit allows a period for allowing a switching operation of enabling or disabling the alarm device information to be a predetermined period after activation of the control unit or after a predetermined operation. It may be configured to limit. By limiting the switching operation of the alarm information to be valid or invalid for a predetermined period, it is possible to reduce the possibility of data stored in the storage unit being erroneously rewritten. .

  The storage unit may be configured by a non-volatile memory. Thus, even if the power supplied to the control unit of the combustion apparatus is interrupted due to a power failure or the like, the information stored in the storage unit can be held.

  According to one aspect, there is an effect that the alarm can be properly connected without complicated work at the time of construction of the combustion device.

FIG. 1 is a block diagram showing a schematic configuration of a system including a combustion device and an alarm device according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing an example of an output voltage of the alarm according to the state of the alarm according to the present embodiment and an input voltage input from the alarm to the control unit. FIG. 3 is a flowchart showing the flow of the combustion control process based on the detection signal of the alarm device of the combustion apparatus in the present embodiment. FIG. 4 is an external view showing the operation unit in the present embodiment. FIG. 5 is an operation principle diagram showing an example of the hot water supply apparatus in the present embodiment. FIG. 6 is a flowchart showing the flow of the combustion control process based on the detection signal of the alarm device of the combustion apparatus in the second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference numerals throughout all the drawings, and the redundant description will be omitted.

First Embodiment
FIG. 1 is a block diagram showing a schematic configuration of a system including a combustion device and an alarm device according to Embodiment 1 of the present invention. As shown in FIG. 1, the combustion apparatus 1 according to the present embodiment includes a combustion unit 8 that burns a fuel gas, and a control board 9 that is connected to the combustion unit 8 and includes a control unit 3 that controls the combustion unit 8. Is equipped. The control unit 3 is configured by a computer that performs arithmetic processing such as a microcomputer. Furthermore, the combustion apparatus 1 includes a notification unit 6 that notifies various information, and an operation unit 7 that can perform a predetermined input operation. The configuration of the notification unit 6 is not particularly limited, but various notification modes such as a mode of displaying on a display, a mode of notifying by turning on or off a lamp, a mode of notifying by buzzer or voice, and the like can be adopted.

  The combustion apparatus 1 is configured to be connectable to an alarm (CO alarm) 2 that detects and warns of carbon monoxide. In more detail, the combustion apparatus 1 is provided with the connection part 4 which connects the control part 3 and the alarm device 2. The alarm 2 has an output voltage line L1 that generates an output voltage Vout and a reference voltage line L2 that generates a reference voltage Vg, and the value (voltage level) of the output voltage Vout with respect to the reference voltage Vg It is comprised so that the combustion apparatus 1 may be notified as a predetermined signal which shows the state of. The connection unit 4 can connect the output voltage line L1 of the alarm 2 and the input terminal 3t of the control unit 3, and can connect the reference voltage line L2 to a reference voltage source (for example, ground) GND in the combustion apparatus 1 It is configured. Thereby, when the alarm device 2 is connected to the connection unit 4, the output voltage line L 1 and the input terminal 3 t of the control unit 3 are connected, and the reference voltage line L 2 and the reference voltage source GND are connected. Therefore, the output voltage Vout output from the alarm device 2 is a voltage with respect to the reference voltage source GND of the combustion device 1. For example, the alarm device 2 includes a connector or the like as an external output structure of the output voltage line L1 and the reference voltage line L2, and the connection unit 4 is configured as a connection port to which the connector of the alarm device 2 is connected.

  The alarm device 2 is configured to be able to output an output voltage Vout by power from a power supply (not shown). The power supply for supplying power to the alarm device 2 may be configured to be connected by connecting the alarm device 2 to the connection portion 4 of the combustion apparatus 1 or is configured to be connected separately from the connection portion 4 It may be

  The input terminal 3 t of the control unit 3 and the connection point of the output voltage line L 1 of the connection unit 4 are connected via the capturing circuit 10. The capture circuit 10 is a buffer circuit for suppressing the influence of the change in the connection status of the alarm device 2. Specifically, it is configured by an overvoltage prevention circuit, an impedance adjustment circuit, and / or a noise removal filter or the like that prevents the overvoltage from being directly applied to the control unit 3 even if an overvoltage exceeding the allowable voltage is applied. As a result, the input voltage Vin input to the input terminal 3 t of the control unit 3 does not completely match the output voltage Vout of the alarm device 2 and becomes a voltage slightly lower than the output voltage Vout. The analog voltage signal from the alarm device 2 input to the input terminal 3t of the control unit 3 is digitized, and the control unit 3 generates an alarm device 2 such as a combustion control process based on the digitized voltage signal value. Perform each process based on

  The alarm device 2 is configured to have a voltage such that the input voltage Vin input to the input terminal 3t in a state of being connected to the connection unit 4 becomes equal to or higher than the first voltage V1. FIG. 2 is a diagram showing an example of the output voltage Vout of the alarm according to the state of the alarm according to the present embodiment and an input voltage Vin input to the control unit from the alarm. In the example shown in FIG. 2, the alarm device 2 is configured to be able to output a voltage less than 5 V as the output voltage Vout. Further, the first voltage V1 is set to a voltage (for example, 0.7 V) based on the output voltage Vout = 1 V from the alarm device 2. Furthermore, the alarm device 2 detects the input voltage Vin input to the input terminal 3t according to the concentration of carbon monoxide detected in a predetermined detection area in the vicinity of the combustion unit 8 or other combustion apparatus 11 or the like. A detection signal is output having a voltage that is in a predetermined voltage range larger than the voltage V1.

  For example, in the alarm device 2, the input voltage Vin is in the first voltage range A1, in the second voltage range A2 which is a voltage range higher than the first voltage range A1, or in a voltage range higher than the second voltage range A2. It is possible to output a detection signal having a voltage that falls within the three voltage range A3. The alarm device 2 determines a predetermined voltage range A1 ′ centered on 2 V so that the input voltage Vin falls within the first voltage range A1 when determining the normal state in which the concentration of carbon monoxide is less than the reference value. Output a voltage signal (normal signal) within 8 V to 2.2 V). Further, the alarm device 2 determines a predetermined voltage centered on 3.5 V so that the input voltage Vin falls within the second voltage range A2 when the light alarm condition where the concentration of carbon monoxide is slightly higher than the reference value is determined. It outputs a voltage signal (light alarm signal) within the range A2 '(3.3 V to 3.7 V). Further, when the alarm device 2 determines a severe alarm state in which the concentration of carbon monoxide is higher than the light alarm state, the predetermined voltage centered on 4.5 V so that the input voltage Vin falls within the third voltage range A3. A voltage signal (severe alarm signal) within the range A3 '(4.3 V to 4.7 V) is output.

  The control unit 3 is configured to be able to determine whether to prohibit the combustion in the combustion device 1 based on the alarm information according to the voltage signal from the alarm 2. More specifically, when the control unit 3 receives a normal signal in which the input voltage Vin falls within the first voltage range A1, the control unit 3 performs normal processing that allows combustion in the combustion unit 8, and the input voltage Vin has a second voltage range A2. When an alarm signal that falls within the inner voltage range or the third voltage range A3 is received, a combustion inhibition process is performed to inhibit the combustion in the combustion unit 8.

  The combustion apparatus 1 further includes a storage unit 5 that stores the presence or absence of the connection of the alarm 2. The storage unit 5 is configured of a non-volatile memory such as an EEPROM. Thereby, even if the power supplied to the control unit 3 of the combustion apparatus 1 is interrupted due to a power failure or the like, the information stored in the storage unit 5 can be held. The control unit 3, the connection unit 4, the storage unit 5, the capture circuit 10, and the reference voltage source GND are configured on the control board 9. Although FIG. 1 exemplifies that these configurations are configured on one control substrate 9, it may be configured using a plurality of control substrates, and connection unit 4, storage unit 5, and The reference voltage source GND may be configured separately from the control board 9.

  The control unit 3 stores data indicating that the alarm device 2 is in the connected state in the storage unit 5 when the alarm device 2 is connected to the connection unit 4. More specifically, when the input voltage Vin input to the input terminal 3 t is equal to or higher than a predetermined first voltage V 1, the control unit 3 determines that the alarm 2 is in the connected state, and the storage unit 5 It is configured to store data indicating that the alarm 2 is in the connected state. Control unit 3 stores data indicating that alarm 2 is in a connected state in storage unit 5 when input voltage Vin is continuously greater than or equal to first voltage V1 for a predetermined time (for example, 30 seconds). You may do it.

  FIG. 3 is a flowchart showing the flow of the combustion control process based on the detection signal of the alarm device of the combustion apparatus in the present embodiment. Although not shown in FIG. 3, as an initial setting, data indicating that the alarm 2 is not connected is stored in the storage unit 5 when the alarm 2 is not connected to the combustion apparatus 1. There is.

  As a combustion control process based on the detection signal of the alarm device 2, the control unit 3 first reads data indicating the presence / absence of connection of the alarm device 2 from the storage unit 5 (step SA1). The control unit 3 determines whether or not the alarm 2 is connected based on the read data (step SA2). When it is determined that the alarm device 2 is in the connected state (when “connected” is selected in step SA2), the control unit 3 performs disconnection determination processing (steps SA3 to SA4). That is, when the data stored in the storage unit 5 is data indicating that the alarm device 2 is in the connected state, the control unit 3 determines that the disconnection determination process is valid, and executes the disconnection determination process. Do.

  The controller 3 determines that the connection path between the alarm 2 and the controller 3 is disconnected when the input voltage Vin input from the alarm 2 to the input terminal 3t is less than the first voltage V1. Processing is configured to be executable. That is, the control unit 3 determines whether the input voltage Vin is less than the first voltage V1 (step SA3). Then, when the input voltage Vin is less than the first voltage V1, the control unit 3 determines that the connection path between the alarm device 2 and the control unit 3 is disconnected, and executes disconnection processing (step SA4). The control unit 3 disconnects the connection path between the alarm unit 2 and the control unit 3 when the state where the input voltage Vin is less than the first voltage V1 continues for a predetermined time (for example, several seconds to several minutes). It may be determined that

  In the disconnection process, the control unit 3 prohibits the combustion in the combustion unit 8 and notifies the notification unit 6 that the connection path from the alarm device 2 is disconnected. According to this, since the disconnection determination processing is effective only when the alarm 2 is in the connected state, it is not necessary to separately determine whether the result in the disconnection determination processing is due to the disconnection of the alarm 2. Therefore, it is possible to further simplify the work until the alarm device 2 is connected to the connection portion 4 of the combustion device 1 and the disconnection determination process is performed.

  When it is determined in step SA2 that the alarm device 2 is in the non-connection state in the determination as to whether or not the alarm device 2 is connected (when “non-connection” is selected in step SA2), the control unit 3 determines that the input voltage Vin is It is determined whether it is 1 voltage V1 or more (step SA5). When input voltage Vin is equal to or higher than first voltage V1 (Yes in step SA5), control unit 3 rewrites data indicating the presence / absence of connection of storage unit 5 to data indicating the connected state (step SA6). ). Thereby, the alarm unit 2 is connected to the storage unit 5 based on the input voltage Vin input to the input terminal 3 t of the control unit 3 when the alarm unit 2 is connected to the connection unit 4. It can store data indicating that. Therefore, only by connecting the alarm device 2, data indicating that the alarm device 2 is in the connected state can be reliably stored in the storage unit 5.

  Control unit 3 stores data indicating that alarm 2 is in the connected state in storage unit 5 and input voltage Vin is equal to or higher than first voltage V1 (No in step SA3 or step SA6). After) the combustion control based on the input voltage Vin is performed (steps SA7 to SA11).

  The control unit 3 determines whether the detection signal from the alarm device 2 is an alarm signal. More specifically, the control unit 3 determines whether the input voltage Vin is included in the second voltage range A2 or in the third voltage range A3 (step SA7). When the input voltage Vin is included in the second voltage range A2 or in the third voltage range A3 (Yes in step SA7), a combustion prohibition process for prohibiting the combustion in the combustion unit 8 is performed (step SA8). Note that the control unit 3 performs the combustion inhibition process when the state in which the input voltage Vin is included in the second voltage range A2 or in the third voltage range A3 continues for a predetermined time (for example, several seconds to several minutes). Good. In the combustion inhibition process, the control unit 3 notifies, via the notification unit 6, an alarm about the high concentration of carbon monoxide. It is also possible to make the control mode and / or the notification mode different depending on whether the input voltage Vin is included in the second voltage range A2 or in the third voltage range A3.

  When the input voltage Vin is not included in any of the second voltage range A2 and the third voltage range A3 (No in step SA7), the control unit 3 determines whether the detection signal from the alarm device 2 is a normal signal It is determined whether or not. More specifically, control unit 3 determines whether or not input voltage Vin is included in the first voltage range A1 (step SA9). When the input voltage Vin is included in the first voltage range A1 (Yes in step SA9), the control unit 3 performs a normal process that allows the combustion in the combustion unit 8 (step SA10). In this case, the control unit 3 may notify information related to the carbon monoxide concentration being equal to or less than the reference value through the notification unit 6.

  When the input voltage Vin is not included in any of the first voltage range A1, the second voltage range A2, and the third voltage range A3 (No in step SA9), the control unit 3 determines that the alarm 2 has a fault. A process is performed (step SA11). That is, when the input voltage Vin is equal to or higher than the first voltage V1 and out of the voltage range A1 to A3 defined as the detection signal, the control unit 3 determines that the alarm 2 is broken. More specifically, the voltage range in which it is determined that the alarm device 2 has a fault is a voltage range smaller than the minimum value of the first voltage range A1 at the first voltage V1 or more and a maximum value of the first voltage range A1. A voltage range that is significantly smaller than the minimum value of the second voltage range A2, a voltage range that is larger than the maximum value of the second voltage range A2, smaller than the minimum value of the third voltage range A3, and a voltage range that is larger than the maximum value of the third voltage range A3. It is. The voltage range larger than the maximum value of the third voltage range A3 may be the same as the heavy alarm (that is, included in the third voltage range A3). Note that the control unit 3 determines that the input voltage Vin is not included in any of the first voltage range A1, the second voltage range A2, and the third voltage range A3 for a predetermined time (for example, several seconds to several minutes). The failure process may be performed in the case of continuous operation.

  In the failure processing, the control unit 3 prohibits the combustion in the combustion unit 8 and notifies the notification unit 6 that the alarm 2 is broken.

  As described above, according to the above configuration, information on whether the alarm device 2 is in the connected state or in the disconnected state is stored in the storage unit 5. Then, since the alarm 2 is connected to the connection unit 4, data indicating that the alarm 2 is in the connected state is stored in the storage unit 5. Therefore, the control unit 3 can automatically recognize the connection of the alarm 2 simply by connecting the alarm 2 to the connection portion 4 of the combustion apparatus 1 by the builder. Therefore, even if the installer does not have specialized knowledge, the alarm device 2 can be properly connected without performing complicated work at the time of installation of the combustion device 1.

  Further, the detection signal of carbon monoxide in the alarm 2 and the connection signal indicating the connection state of the alarm 2 are transmitted by the same output signal line L1. In other words, by using the signal line voltage for outputting the detection signal of the alarm 2 as a connection signal indicating the connection state of the alarm 2, the alarm without changing the configuration of the existing alarm 2 The control unit 3 can reliably determine the presence or absence of connection 2.

  Furthermore, failure determination of the alarm device 2 can also be performed based on the input voltage Vin input to the input terminal 3 t of the control unit 3.

  Here, the operation unit 7 can change the data indicating that the alarm 2 stored in the storage unit 5 is in the connected state into data indicating that the alarm 2 is disconnected. Act as a department. FIG. 4 is an external view showing the operation unit in the present embodiment. As shown in FIG. 4, the operation unit 7 includes a plurality of switches such as a hot water setting switch SW1, an upward switch SW2, a downward switch SW3, and a power switch SW4. In addition, power switch SW4 is a switch which switches the state which can perform the hot-water supply driving | operation of the combustion apparatus 1, and the state which can not perform the hot-water supply operation. Switching between supply and shutoff of commercial power to the combustion device 1 including the alarm 2 is performed separately from the power switch SW4. For example, switching between supply and shutoff of commercial power may be performed by switching between connecting and shutting off a power plug (not shown) of the combustion apparatus 1 to a power outlet, or a leak that the combustion apparatus 1 incorporates separately It may be performed by switching a breaker (not shown).

  Further, in the present embodiment, the operation unit 7 and the display unit 6 a and the sound output unit 6 b which are the notification unit 6 are integrally provided. The operation unit 7 may be connected to the control unit 3 by wire (for example, a 2-core signal line) or may be configured to be capable of wireless communication with the control unit 3. The operation unit 7 may be attached to the main body of the combustion device 1 or may be attached to a place (for example, a wall surface indoors etc.) different from the main body of the combustion device 1.

  The control unit 3 causes the display unit 6 a to display a setting change screen when a predetermined operation is performed in the operation unit 7. For example, the setting change screen is displayed on the display unit 6a by continuously pressing the hot water amount setting switch SW1 for a predetermined time (for example, 2 seconds). The control unit 3 switches and displays the setting item to be changed in accordance with the pressing operation of the upward switch SW2 or the downward switch SW3 in the setting change screen. For example, a predetermined item number or the like is displayed as a setting item on the display unit 6a. When the hot water setting switch SW1 is pressed and operated in a state where the change setting item of the connection of the alarm device 2 is displayed, the control unit 3 displays an alarm connection / non-connection setting screen on the display unit 6a.

  In response to the pressing operation of the up switch SW2 or the down switch SW3 on the alarm connection / non-connection setting screen, the control unit 3 selects whether to set the alarm 2 to the connection state or the disconnection state regarding connection / non-connection. Configured to be possible. The display unit 6a shows a selected state (connected state or disconnected state), and when the hot water content setting switch SW1 is pressed in the state where the state is displayed, the selected state is stored in the storage unit 5 It is memorized. Therefore, data indicating that alarm 2 stored in storage unit 5 is in the connected state by operating hot water amount setting switch SW1 in a state where the non-connected state is indicated on the alarm connection / non-connection setting screen. Can be changed to data indicating that the alarm 2 is in a disconnected state.

  If data indicating that the alarm 2 is not connected is stored in the storage unit 5 by the operation of the operation unit 7 after the alarm 2 is removed, in the subsequent combustion control process. The controller 3 does not perform the disconnection determination process and the disconnection process.

  According to this, when the alarm 2 becomes unnecessary, or when the alarm 2 is not properly operated due to a failure, the alarm 2 is actually removed after the alarm 2 is actually removed. The signal from can be disabled. As a result, it is possible to prevent such a problem that the combustion in the combustion apparatus 1 is prohibited based on the erroneous disconnection determination result.

  The operation unit 7 functioning as the first operation unit restricts a period (permissible period) for allowing a switching operation to be in the connection state or in the non-connection state to a predetermined period after a predetermined operation. Configured to For example, after the power switch SW4 is pressed, the operation unit 7 is configured to be able to display an alarm connection / non-application setting screen as a setting item on the setting change screen for only 10 minutes. By limiting the switching operation of setting the alarm device 2 to the connection state or the disconnection state to a predetermined period, the possibility of erroneously changing the data stored in the storage unit 5 is reduced. can do.

  The operation unit 7 may limit the allowable period to, for example, a predetermined period (10 minutes) after activation of the commercial power, that is, after activation of the control unit 3. In this case, the disconnection determination processing and the disconnection processing may not be performed until a predetermined time (for example, 15 minutes) elapses after activation of the control unit 3. It is preferable that the period in which the determination of disconnection or the disconnection processing is not performed after activation of the control unit 3 is longer than the allowable period. Since switching between the connection state and the non-connection state may occur during the allowable period, there is a possibility that the disconnection determination process or the disconnection process may be erroneously performed before the switching.

  Hereinafter, an example of a hot water supply apparatus is shown as an example of the combustion apparatus 1. FIG. 5 is an operation principle diagram showing an example of the hot water supply apparatus in the present embodiment. The hot water supply apparatus 201 (the combustion apparatus 1 in FIG. 1) shown in FIG. 5 is a hot water supply apparatus provided with a hot water supply function. The alarm 2 is not shown in FIG. The hot water supply apparatus 201 includes a combustion apparatus 202 (combustion unit 8 in FIG. 1) for burning a fuel gas, a fuel gas supply path 221 for supplying the fuel gas to the combustion apparatus 202, and a blower 222 for supplying air to the combustion apparatus 202 , The hot water supply flow path 203, and the controller 205. The alarm 2 is provided, for example, in the vicinity of the combustion device 202.

  The burner unit 224 is provided in the combustion apparatus 202, and the fuel gas is supplied to the burner unit 224 from the fuel gas supply passage 221. The fuel gas supply path 221 is provided with a source gas solenoid valve 225 which switches between supply and shutoff of the fuel gas, and a gas proportional valve 226 for adjusting the supply amount of the fuel gas. Further, the burner unit 224 is provided with a plurality of hot water supply capacity switching gas solenoid valves 228 and a hot water supply gas solenoid valve 229.

  The hot water supply flow path 203 heats the water by heat exchange with the combustion gas generated by the combustion device 202, and the outward path portion 232 which sends the water supplied from a water pipe or the like from the water supply inlet 231 to a heat exchange portion 233 described later. It is comprised from piping which forms the heat exchange part 233 and the return path part 235 which sends hot water from the heat exchange part 233 to the hot water supply outlet 234. In order to adjust the amount and temperature of the hot water supply, the return part 235 is provided with a hot water supply amount adjustment valve 236 for adjusting the amount of hot water supply and a mixing valve 237 for adjusting the mixing ratio of water and hot water.

  The controller 205 includes a control device 208 (the control unit 3 in FIG. 1) and a switching power supply device 206 (hereinafter, may be simply referred to as “power supply device 206”). The control device 208 includes a microcontroller or integrated circuit configured of a CPU, a ROM, a RAM, and the like. The control device 208 is provided with a signal path (not shown) for controlling each electric component and the like between the blower 222 and the electric component including the various solenoid valves. Controller 205 executes various controls of water heating apparatus 201 in accordance with a control program stored in control device 208. The control program includes various programs related to the operation of each electrical component, and the control of each electrical component is performed based on these programs.

  Electric power is supplied to the controller 205 from an external power supply (not shown), and the power supply device 206 generates a power supply (for example, a DC 15 V power supply for driving a device such as a solenoid valve) used in the water heater 201. The voltage is converted by the power supply device 206 into a voltage as required, and is supplied to the control device 208, the combustion device 202, the blower 222, various types of solenoid valves, various types of sensors such as various electric components.

  The specific configuration of water heating apparatus 201 is not limited to the present embodiment. For example, the mixing valve 237 may be omitted. Further, the heat exchange unit 233 may be configured by a plurality of heat exchangers. For example, the plurality of heat exchangers may include a heat exchanger that mainly recovers the sensible heat of the combustion gas, and a heat exchanger that mainly recovers the latent heat of the combustion gas.

  Second Embodiment Next, a second embodiment will be described. The same components in the present embodiment as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted. The combustion apparatus 1 in the present embodiment also has the same configuration as the configuration shown in FIG. The difference between the combustion apparatus 1 according to the present embodiment and the first embodiment is that the operation unit 7 can perform switching operation of enabling or disabling alarm information based on a signal from the alarm 2. Function as a second operation unit. Furthermore, the storage unit 5 stores data indicating whether the alarm device information is to be valid or invalid based on the switching operation by the operation unit 7 functioning as the second operation unit. Furthermore, when a signal from the alarm device 2 is input to the control unit 3 while the alarm device 2 is in the connected state and data indicating that the alarm device information is to be valid is stored. It is comprised so that it may be judged whether combustion in the combustion part 8 of the combustion apparatus 1 is prohibited based on alarm information.

  FIG. 6 is a flowchart showing the flow of the combustion control process based on the detection signal of the alarm device of the combustion apparatus in the second embodiment of the present invention. Although not shown in FIG. 6, as an initial setting, data and alarm device information indicating that the alarm device 2 is not connected to the storage unit 5 when the alarm device 2 is not connected to the combustion apparatus 1 Data is stored to indicate that the

  As a combustion control process based on the detection signal of the alarm device 2, the control unit 3 first reads data indicating presence / absence of connection of the alarm device 2 and data indicating enabling / disabling of alarm information from the storage unit 5 ( Step SB1). The control unit 3 determines whether or not the alarm 2 is connected based on the read data (step SB2).

  When it is determined that the alarm device 2 is in the disconnection state (when “disconnection” is selected in step SB2), the control unit 3 determines whether the input voltage Vin is equal to or higher than the first voltage V1 (step SB3). ). When the input voltage Vin is equal to or higher than the first voltage V1 (Yes in step SB3), the control unit 3 validates the alarm information together with data indicating that the alarm 2 is connected to the storage unit 5. A process of storing the indicated data is performed (step SB4). As a result, when connecting the alarm device 2 to the connection unit 4 of the combustion apparatus 1, it is possible to save time and effort to switch the alarm device information to be effective, and the alarm device 2 is connected even though the alarm device 2 is connected. It is possible to prevent the occurrence of a state where the control of the combustion device 1 based on the above does not function. Therefore, appropriate construction can be easily performed. The control unit 3 is data indicating that the alarm unit 2 is connected to the storage unit 5 when the state where the input voltage Vin is the first voltage V1 or more continues for a predetermined time (for example, several seconds to several minutes). In addition to this, processing may be performed to store data indicating that alarm information is to be validated.

  The control unit 3 stores in the storage unit 5 data indicating that the alarm 2 is in a connected state and data indicating that alarm information is to be validated, and further, the input voltage Vin is equal to or higher than the first voltage V1. If it is (No after step SB4 or step SB7 described later), combustion control processing based on the input voltage Vin is performed (step SB5). This combustion control process is the same as the process in steps SA7 to SA11 of FIG. 3 in the first embodiment.

  When it is determined in step SB2 that the alarm device 2 is in the connected state in the determination as to whether or not the alarm device 2 is connected (when “connected” is selected in step SB2), the control unit 3 is stored in the storage unit 5 It is determined whether the present data is data indicating that the alarm device information is to be valid (step SB6). When the data stored in storage unit 5 is data indicating that the alarm information is to be valid (when valid is selected in step SB6), control unit 3 performs the disconnection determination process (steps SB7 to SB8). ). That is, in the case where the data stored in storage unit 5 is data indicating that alarm 2 is in a connected state and control unit 3 is data indicating that alarm information is to be validated. The disconnection determination processing is determined to be effective, and the disconnection determination processing is executed.

  In the disconnection determination process, control unit 3 determines whether or not input voltage Vin is less than first voltage V1 (step SB7). Then, when the input voltage Vin is less than the first voltage V1, the control unit 3 determines that the connection path between the alarm device 2 and the control unit 3 is disconnected, and executes disconnection processing (step SB8). The contents of the disconnection process are the same as in the first embodiment. The control unit 3 may execute the disconnection determination process when the state in which the input voltage Vin is less than the first voltage V1 continues for a predetermined time (for example, several seconds to several minutes).

  When the data stored in the storage unit 5 is data indicating that the alarm information is to be invalidated (when invalidation is selected in step SB6), the control unit 3 performs alert notification by the notification unit 6, while: Control is performed so as not to determine whether to prohibit the combustion in the combustion unit 8 of the combustion apparatus 1 based on the alarm information (step SB9). According to this, when the alarm device 2 is in the connected state and the alarm device information is invalidated, the combustion in the combustion unit 8 is permitted. At this time, since the alarm unit 2 is apparently not connected although it is apparently connected, the notification unit 6 issues a warning notification to recognize to the user that the alarm unit 2 is not functioning. It can be done.

  Further, the control unit 3 determines the presence or absence of an operation for rewriting the validity or invalidity of the alarm device information (step SB10). When there is an operation to rewrite the valid or invalid of alarm device information (Yes in step SB10), control unit 3 rewrites data indicating that the alarm device information stored in storage unit 5 is to be valid or invalid. Perform (step SB11). The method of rewriting the alarm device information to data indicating that the alarm information is to be valid or invalid is the same as the method of rewriting data indicating the presence or absence of connection in the first embodiment. Also in the rewriting process in the present embodiment, the operation unit 7 allows a switching operation of enabling or disabling alarm device information after activation of the control unit 3 or after a predetermined operation. , Configured to limit to a predetermined period. By limiting the switching operation of enabling or disabling the alarm device information to a predetermined period, it is possible to reduce the possibility that the data stored in the storage unit 5 is erroneously rewritten. it can.

  As described above, according to the present embodiment, in addition to the state as to whether or not the alarm 2 is connected, the state as to whether or not the alarm information is made valid is stored in the storage unit 5. Thus, for example, based on alarm information such as alarm information indicating that the concentration of carbon monoxide is high, whether or not the control unit 3 determines whether to prohibit combustion in the combustion unit 8 of the combustion device 1 or not Can be set separately from the connection / non-connection of the alarm device 2. Therefore, the combustion device based on the alarm 2 without removing the alarm 2, for example, in the case where the alarm 2 is in a failure state or in the case of erroneous detection such as detection of carbon monoxide emitted by other combustion devices 11 The control of 1 can be disabled. As a result, it is possible to avoid a situation where the normal combustion device 1 can not be used due to a defect in the alarm device 2 or the like. Thus, for example, when the alarm device 2 malfunctions or breaks down, it is possible to eliminate the inconvenience that the combustion device 1 itself can not be used until the repair, replacement, etc. by the specialist who repairs the alarm device 2 is completed. it can.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various improvement, change, and correction are possible within the range which does not deviate from the meaning.

  For example, the alarm device 2 in the above embodiment may be configured to be capable of detecting combustible gas (raw gas) in addition to the detection of carbon monoxide. When such an alarm is connected to the combustion apparatus 1, the control unit 3 processes the detection signal output from the alarm when the combustible gas is detected. Similar processing may be performed.

  Moreover, although the hot-water supply apparatus 201 provided only with the hot-water supply function was illustrated as a combustion apparatus 1 in the said embodiment, it is applicable also to the hot-water supply apparatus provided with a bath reheating function or a hot-water heating function. Moreover, the said embodiment is applicable not only to the combustion apparatus 1 which burns fuel gas, but the combustion apparatus which burns petroleum etc.

  The combustion apparatus of the present invention is useful for properly connecting the alarm without complicated operations when installing the combustion apparatus.

Reference Signs List 1 combustion device 2 alarm 3 control unit 3t input terminal 4 connection unit 5 storage unit 6 notification unit 7 operation unit (first operation unit, second operation unit)
201 Water heater (combustion device)
208 Control unit (control unit)
L1 Output voltage line L2 Reference voltage line GND Reference voltage source

Claims (10)

A combustion apparatus to which an alarm for detecting and alarming carbon monoxide can be connected,
A control unit,
A connection unit connecting the control unit and the alarm device;
A storage unit for storing the connection status of the alarm device;
The control unit stores data indicating that the alarm device is in a connected state in the storage unit, when the alarm device is connected to a connection unit ,
The alarm unit is configured to be able to transmit a predetermined signal to the control unit,
The combustion apparatus includes a second operation unit capable of switching whether to enable or disable alarm information based on a signal from the alarm.
Data indicating whether to make the alarm information valid or invalid based on the switching operation by the second operation unit is stored in the storage unit,
The control unit is configured to input a signal from the alarm unit to the control unit in a state in which the alarm unit is in a connected state and data indicating that the alarm unit information is to be valid is stored. A combustion apparatus that determines whether to prohibit combustion in the combustion apparatus based on the alarm information . The alarm has an output voltage line for generating an output voltage and a reference voltage line for generating a reference voltage, and is configured to communicate the state of the alarm to the combustion device with the value of the output voltage with respect to the reference voltage. And
The connection unit is configured to be able to connect an output voltage line of the alarm device and an input terminal of the control unit, and to connect the reference voltage line to a reference voltage source in the combustion apparatus.
The control unit determines that the alarm is in a connected state when the input voltage input to the input terminal is equal to or higher than a predetermined first voltage, and the alarm is connected to the storage unit. Configured to store data indicating that it is
The combustion apparatus according to claim 1, wherein the alarm device is configured to output a voltage such that an input voltage input to the input terminal is higher than the first voltage in a state of being connected to the connection portion. .   The alarm device outputs a detection signal having a voltage range such that the input voltage input to the input terminal is in a predetermined voltage range larger than the first voltage according to the detected concentration of carbon monoxide. The combustion apparatus of claim 2, wherein the combustion apparatus is configured to:   The control unit determines that the alarm is broken when the input voltage input from the alarm to the input terminal is equal to or higher than the first voltage and outside the voltage range defined as the detection signal. The combustion apparatus according to claim 3.   The control unit determines that the connection path between the alarm unit and the control unit is disconnected when the input voltage input from the alarm unit to the input terminal is less than the first voltage. The wire breakage determination process is determined to be valid when the data stored in the storage unit is data indicating that the alarm device is in a connected state. The combustion apparatus according to any one of the above.   The data processing apparatus according to claim 1, further comprising: a first operation unit operable to change data stored in the storage unit and indicating that the alarm is in a connection state into data indicating that the alarm is in a disconnection state. The combustion apparatus according to any one of 5. Equipped with a notification unit,
The control unit performs alert notification by the notification unit when the alarm device is in a connected state and data indicating that the alarm device information is to be invalidated is stored, and the control unit is based on the alarm device information. The combustion apparatus according to any one of claims 1 to 6 , wherein control is performed so as not to determine whether to prohibit the combustion in the combustion apparatus. The control unit stores data indicating that the alarm information is to be validated along with data indicating that the alarm is in a connected state in the storage unit when the alarm is connected to the connection unit. The combustion apparatus according to any one of claims 1 to 7 . The second operation unit allows a period for allowing a switching operation of enabling or disabling the alarm device information to be a predetermined period after activation of the control unit or after a predetermined operation. configured limit to the combustion device according to any one of claims 1 to 8. The combustion apparatus according to any one of claims 1 to 9 , wherein the storage unit comprises a non-volatile memory.

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