JPH0534434U - Ignition structure of combustion device - Google Patents

Abstract

(57) [Abstract] [Purpose] When switching the combustion burner, prevent the release of raw gas and stabilize the ignition. [Composition] In a combustion device in which a combustion burner can be switched to three groups by opening and closing a switching valve, a burner group A located at an end is a burner group which does not pass a switching valve, and the burner group A has an ignition device and an ignition device. A flame detection device is provided, and an ignition device is also provided to the burner group C at the other end which is not adjacent to the burner group A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of the ignition structure of a combustion device such as a water heater and a bath kettle with hot water supply.

[0002]

[Prior Art]

 An ignition structure of a conventional combustion device will be described below with reference to FIGS. 7 and 8. FIG. 7 shows a combustion device in which the combustion burner 1 can be switched to three groups. The burner group A located at the end is a burner group that does not pass the switching valve, and an ignition device 7 and a flame detection device 8 are provided. .. Further, in the other two groups, combustion is turned on and OF is controlled by opening and closing the switching valves 4 and 5. FIG. 8 shows a combustion device in which the combustion burner 1 can be switched to three groups as in FIG. 7, but an example in which the burner group that does not pass the switching valve is the intermediate burner group B.

[0003]

[Problems to be solved by the device]

 In the conventional example of FIG. 7, when the switching valve 4 for controlling the combustion of the burner group B located in the middle portion fails and does not open, the flame of the burner group A having the ignition device 7 at the end portion is opened. Does not transfer to the burner group C at the other end, and raw gas is emitted from the burner group C at the other end. Further, in the conventional example of FIG. 8, since the burner group having the ignition device 7 is the intermediate burner group, there is no problem as in FIG. For ignition, the ignition position is restricted to the long end of the burner. However, there is a problem that the ignition becomes unstable because the long end of the burner is a region in which the amount of ejected gas is likely to vary and the ambient air flow is easily disturbed.

The present invention has been made in view of the above problems, and it is an object of the present invention to prevent release of raw gas and to stabilize ignition when switching the combustion burner.

[0005]

[Means for Solving the Problems]

 The present invention has been made in order to achieve the above-mentioned object, and will be described below with reference to FIGS. 1 to 6 corresponding to the embodiments. The first invention is to open a combustion burner by opening and closing a switching valve. In the combustion device that can be switched to three groups, the burner group A located at the end is not a burner group that does not pass the switching valve, and an ignition device and a flame detection device are provided in the burner group A, and the burner group is also provided. An ignition device is also provided in the burner group C at the other end which is not adjacent to A.

A second invention is a combustion apparatus in which a combustion burner can be switched to three groups by opening and closing a switching valve, and a burner group A located at an end is a burner group that does not pass the switching valve. The burner group A is provided with an ignition device and a flame detection device, and the burner group B or the burner group C other than the burner group A 2 is also provided with a flame detection device.

Further, a third invention is a combustion device in which a combustion burner can be switched to a third group by opening and closing a switching valve, and a burner group A located at an end is a burner group which does not pass the switching valve. , The burner group A is provided with an ignition device and a flame detection device, and the switching valve C, which controls the combustion of the burner group C at the other end which is not adjacent to the burner group A, controls the combustion of the intermediate burner group B. It is characterized in that it is connected downstream of the switching valve B.

A fourth invention is a combustor in which a combustion burner can be switched to three groups by opening and closing a switching valve, and a burner group A located at an end is provided with an ignition device, and an intermediate unit is provided. The burner group B located or the burner group C located at the other end is a burner group that does not pass the switching valve, and a flame detection device is provided in the burner group that does not pass the switching valve.

[0009]

[Action]

 According to the first invention, the igniters 7, 7 are provided in the burner groups A, C at both ends, and the igniters 7, 7 are activated even when the combustion burner group is switched other than during ignition. Therefore, even if the switching valve 4 that controls the combustion of the burner group B in the middle portion fails and is not opened, the burner group C at the other end can be reliably ignited.

According to the second invention, the burner group B or the burner group C other than the burner group A having the ignition device 7 is also provided with the flame detection devices 8 to monitor whether or not a flame is formed. Therefore, if the switching valve 4 or 5 fails and does not open, an abnormality is detected by the flame detection devices 8 1 and 8 and all the gas valves are shut off.

According to the third invention, the switching valve 5 for switching the combustion of the burner group A having the ignition device 7 and the other burner group C not adjacent to each other is connected downstream of the switching valve 4. Therefore, when the switching valve 4 fails and does not open, no gas flows to the burner group C.

According to the fourth invention, flame detectors 8, 8 are provided in the burner group B or the burner group C other than the burner group A having the ignition device 7 to monitor whether or not a flame is formed. Therefore, if the switching valve 5 or 4 fails and does not open, an abnormality is detected by the flame detecting devices 8 and 8, and all the gas valves are shut off.

In any of the first to fourth inventions, the ignition device 7 is provided in the burner group at the end portion, so that the position where ignition is most stable can be selected.

[0014]

【Example】

 An embodiment of the first invention will be described with reference to FIG. 1. 1 is a combustion burner, 2 is a safety gas valve, 3 is a hot water supply gas valve, 4 and 5 are switching valves, and 6 is a gas amount adjusting valve. Reference numeral 7 is an ignition device such as a spark plug, and 8 is a flame detection device such as a frame rod. The burner burner 1 can be switched to three groups A, B, and C by the switching valves 4 and 5, and the burner group A located at the end is a burner group that does not pass the switching valve, and the ignition device 7 and the flame detection device 8 are provided. An ignition device 7 is also provided in the other burner group C which is not adjacent to the burner group A.

In the above configuration, when hot water is used, the safety gas valve 2 and the hot water supply gas valve 3 are opened, and the burner group A at the end which does not pass the switching valve is ignited by the ignition device. Then, when the flame detection device 8 detects that the ignition is normally performed, the opening degree of the gas amount adjustment valve 6 is adjusted so that a predetermined hot water temperature is obtained. Here, when the predetermined gas amount is not obtained even when the opening amount of the gas amount adjusting valve 6 reaches the predetermined opening amount, the switching valve 4 is opened and the two groups of the burner groups A and B start to burn, The opening degree of the quantity adjusting valve 6 is readjusted. Further, if the predetermined gas amount is not obtained even when the opening amount of the gas amount adjusting valve 6 reaches the specified opening amount, the switching valve 5 is also opened and all the burner groups A, B, C are burned. .. Then, the opening degree of the gas amount adjusting valve 6 is adjusted again so that the predetermined hot water temperature is obtained. During the above operation, when the switching valves 4 and 5 are opened, the ignition device 7 also operates to ensure that the other burner groups are ignited.

An embodiment of the second invention will be described with reference to FIGS. 2 and 3. In FIG. 2, a flame detection device 8 is provided instead of the ignition device 7 in the burner group C in FIG. In the embodiment in which it is monitored whether or not the gas is formed, all gas valves are shut off when an abnormality is found. Further, FIG. 3 is an embodiment in which the burner group provided with the flame detection device 8 in FIG. 2 is changed from the burner group C to the burner group B, and whether or not a flame is formed in the burner group B is monitored. If a gas is found, all gas valves will be shut off.

An embodiment of the third invention will be described with reference to FIG. 4. In an embodiment in which the switching valve 5 is connected downstream of the switching valve 4 instead of providing the ignition device 7 in the burner group C in FIG. When the switching valve 4 fails and does not open, gas does not flow to the burner group C.

An embodiment of the fourth invention will be described with reference to FIGS. 5 and 6. The burner group A located at the end is provided with the ignition device 7, and the burner group B located at the middle part or the bar located at the other end. A burner group that does not pass the switching valve is provided in any one of the group C and the flame detection device 8 is provided in the burner group that does not pass the switching valve. In the above structure, in FIG. 5, the safety gas valve 2, the hot water supply gas valve 3 and the switching valve 9 are opened when hot water is used, and the burner group A at the end is ignited by the ignition device 7. When the flame detection device 8 detects that the fire has transferred to the burner group B that does not pass through the switching valve, the opening adjustment of the gas amount adjusting valve 6 and the switching valve 9, the switching valve so that a predetermined hot water temperature is obtained. ON / OFF control of 5 is performed. Further, in FIG. 6, the safety gas valve 2, the hot water supply gas valve 3, the switching valve 9 and the switching valve 4 are opened when hot water is used, and the burner group A at the end is ignited by the ignition device 7. When the flame detection device 8 detects that the burner group C 1 that does not pass the switching valve is transferred, the opening adjustment of the gas amount adjusting valve 6 and the switching valve 9 and the switching valve 4 are controlled so that a predetermined hot water temperature can be obtained. ON-OFF control is performed. In addition, in the embodiment shown in FIGS. 5 and 6, since only one flame detection device is required, the cost can be reduced as compared with the embodiments shown in FIGS.

[0019]

[Effect of the device]

 The present invention has the following effects. 1) In the present invention, the burner group A located at the end is not a burner group that does not pass the switching valve, and the burner group A is provided with an ignition device and a flame detection device, and the other end that is not adjacent to the burner group A is provided. Since the burner group C is also provided with an ignition device, even if the switching valve for controlling the combustion of the intermediate burner group fails and does not open, raw gas is emitted as in the conventional case. There is no. Further, since the ignition device is arranged on the burner at the end, the ignition position can be set at an arbitrary position in the longitudinal direction of the burner, so that the ignition is not unstable due to the restriction of the ignition position as in the conventional case. 2) In the present invention, the burner group A located at the end is a burner group that does not pass the switching valve, the burner group A is provided with an ignition device and a flame detection device, and the burner group B other than the burner group A is provided. Alternatively, since the burner group C is also provided with the flame detection device, whether or not the burner group C or the burner group B has caught fire is monitored, so that the gas can be shut off in the event of an abnormality. 3) In the present invention, the burner group A located at the end is a burner group that does not pass the switching valve, the burner group A is provided with an ignition device and a flame detection device, and the other end that is not adjacent to the burner group A is provided. Since the switching valve C for controlling the combustion of the burner group C is connected downstream of the switching valve B for controlling the combustion of the intermediate burner group B 1, the switching valve 4 for controlling the combustion of the central burner group B 1 Since the gas does not flow into the burner group C at the other end unless it is opened normally, the release of raw gas from the burner group C can be reliably prevented. 4) In the present invention, the burner group A located at the end is provided with an igniter, and the burner group B located at the middle part or the burner group C located at the other end is made a burner group that does not pass the switching valve. Since the burner group that does not pass the switching valve is provided with the flame detection device, it is monitored whether or not the burner group B or the burner group C has set fire, so the gas can be shut off in the event of an abnormality. ..

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a plan view showing an embodiment of the present invention.

FIG. 4 is a plan view showing an embodiment of the present invention.

FIG. 5 is a plan view showing an embodiment of the present invention.

FIG. 6 is a plan view showing an embodiment of the present invention.

FIG. 7 is a plan view showing a conventional example.

FIG. 8 is a plan view showing a conventional example.

[Explanation of symbols]

1. Combustion burner 2. Safety gas valve 3. Gas valve for hot water supply 4. Switching valve 5. Switching valve 6. Gas amount adjusting valve 7. Ignition device 8. Flame detector 9. Switching valve

Claims (4)

[Scope of utility model registration request] 1. A combustion device in which a combustion burner can be switched to three groups by opening and closing a switching valve, a burner group A located at an end is a burner group that does not pass a switching valve, and the burner group A is ignited. An ignition structure for a combustion device, characterized in that a device and a flame detection device are provided, and an ignition device is also provided to a burner group C at the other end which is not adjacent to the burner group A. 2. In a combustion device in which a combustion burner can be switched to three groups by opening and closing a switching valve, a burner group A located at an end is a burner group that does not pass a switching valve, and the burner group A is ignited. An ignition structure for a combustion device, characterized in that a burner group B or a burner group C other than the burner group A is also provided with a flame detecting device. 3. A combustion device in which a combustion burner can be switched to three groups by opening and closing a switching valve, a burner group A located at an end is a burner group that does not pass a switching valve, and the burner group A is ignited. A switching valve C, which is provided with a device and a flame detection device, and which controls combustion of a burner group C at the other end which is not adjacent to the burner group A, is connected downstream of a switching valve B which controls combustion of an intermediate burner group B. An ignition structure for a combustion device characterized by the above. 4. A combustion device in which a combustion burner can be switched into three groups by opening and closing a switching valve, and a burner group A located at an end portion is provided with an ignition device, and a burner group B located in an intermediate portion or another. An ignition structure for a combustion device, characterized in that the burner group C located at the end is not a burner group that does not pass a switching valve, and a flame detection device is provided in the burner group that does not pass the switching valve.