JPH11344216A - Combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make common parts of burners for high and low calorific power fuel gases and facilitate remodeling them. SOLUTION: This combustion equipment comprises a cylindrical gas volume adjuster 2 for adjusting the volume of fuel gas supplied to a main channel to a burner 11 by manual turning operation and a bypass channel which branches from the main channel and joins it again in a cylinder of the gas volume adjuster 2. When the fuel gas is of a high calorific power, the gas volume adjuster 2 comprises a through hole 2e for adjusting the channel opening on the upstream-side cylindrical surface thereof with respect to the main channel and a gas volume increasing governor 1 for temporarily increasing the volume of fuel gas supplied to the bypass channel at the time of ignition to reduce purge time. When the fuel gas is of a low calorific power, the gas volume adjuster 2 is exchanged with a gas volume adjuster having a through hole for adjusting the channel opening on the downstream-side cylindrical surface thereof with respect to the main channel and the gas volume increasing governor 1 is exchanged with a gas volume governor for limiting the gas pressure within a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus, and more particularly, to a combustion apparatus having a gas amount adjusting section for adjusting a fuel gas amount.

[0002]

2. Description of the Related Art FIG. 8 shows a gas heater as an example of a conventional combustion device. For the main configuration of the gas water heater, refer to the embodiment of the present invention in FIG. When the combustion device has not been used for a long time, the air in the gas flow path from the device plug 20 which is the most downstream open / close valve of the device to the burner 11 is replaced with air. In this case, even if the ignition operation is performed on the combustion device, the non-ignition state continues until the fuel gas reaches the burner 11. For this reason, at the time of ignition, in consideration of the necessary purge time (the time required for the fuel gas to reach the burner from the on-off valve), each valve provided in the gas flow path is forcibly opened, and the ignition is performed. A forced valve-open ignition control mechanism is provided for continuing discharge from the electrode 16 to the burner 11.

However, in such a combustion apparatus, since the discharge time and the forced valve opening time are set uniformly based on the expected purge time, the ignition should normally occur during this purge period. However, there is a problem in that if misfire occurs for some reason, raw gas flows out during the purge period. In other words, if the ignition operation is performed immediately after the fire extinguishing operation to cause non-ignition, the gas flow path is filled with the fuel gas, so that the non-ignition causes the raw gas to flow out. If misfire occurs in a state where the fuel gas is maximized by the adjusting unit, the amount of raw gas to be released increases. The time required for purging is the longest when the fuel gas amount is reduced to the minimum, and the forced valve opening time is set uniformly in accordance with that. Therefore, when fuel gas is restricted, if the amount of fuel gas is temporarily increased to the maximum and the purge time is shortened, the forced valve opening time is shortened and the amount of raw gas emission is reduced, Can be improved.

[0004]

However, various fuel gases are supplied in Japan, and a low calorific value fuel gas is different from a high calorific value fuel gas in that a large amount of fuel gas is supplied to the burner. Since the purge time is short, there is no need to temporarily increase the amount of fuel gas at the time of ignition. Rather, in the case of a fuel gas having a low calorific value, it is necessary to provide a gas governor for limiting the fuel gas amount to a predetermined pressure so that the fuel gas amount does not become excessive. For this reason, it is desired for the combustion device to have an appropriate function for each fuel gas, such as shortening the purge time for a high heat value and not increasing the fuel gas for a low heat value. In addition, it is necessary to easily remodel or change the gas type conversion between the combustion device for the high heating value and the combustion device for the low heating value. Therefore, the combustion apparatus of the present invention solves the above problems, shortens the purge time for a high calorific value, and has a function of not increasing the amount of fuel gas for a low calorific value. An object of the present invention is to facilitate conversion from a calorific value (low calorific value) fuel gas to a low calorific value (high calorific value) fuel gas.

[0005]

According to a first aspect of the present invention, there is provided a combustion apparatus, comprising: a main passage for supplying fuel gas to a burner; In a combustion device comprising a gas amount adjusting means for adjusting the pressure and a forced valve opening means for forcibly opening the main flow path for a predetermined period from the time of the ignition operation, a bypass flow bypassing the gas amount adjusting means is provided. When the amount of fuel gas is reduced by the gas amount adjusting means when the fuel gas has a high calorific value, the gas amount increasing means for temporarily increasing the amount of fuel gas at the time of the ignition operation is provided by the bypass flow. A gas pressure control means for restricting the fuel gas pressure in the bypass flow passage to a predetermined pressure in place of the gas amount increasing means when the fuel gas has a low calorific value. Instead of the above main While the road is fully closed, it is summarized as further comprising a bypass flow rate adjusting means for adjusting the amount of fuel gas to the burner by varying the opening degree of the bypass passage.

According to a second aspect of the present invention, there is provided a combustion apparatus according to the first aspect of the present invention, further comprising a cylindrical surface for partitioning the main flow path, wherein the bypass flow path and the main flow path are separated from each other. A gas amount adjusting section is provided at a junction with the flow path, and the gas amount adjusting section for high heat generation communicates with the cylindrical surface at a predetermined opening with the downstream side of the main flow path regardless of an adjusting operation. A downstream communication portion, and an upstream flow passage opening for changing a flow opening on an upstream side of the main flow passage in conjunction with the adjustment operation, wherein the gas amount adjustment portion for low heat generation is provided on the cylindrical surface. Closes the upstream channel opening of the main channel regardless of the adjusting operation, and includes a downstream channel opening that changes the downstream channel opening of the main channel in conjunction with the adjusting operation, The above gas amount adjusting section is selected according to the level of the calorific value of the fuel gas used. Incorporated it is summarized as.

According to a third aspect of the present invention, there is provided a combustion apparatus according to the second aspect of the present invention, further comprising a sensing burner for detecting a combustion state, and adjusting the gas amount for a high calorific value. In the part, a flow path leading to the sensing burner is formed from the bypass flow path upstream, and a flow path leading from the inside of the cylinder to the sensing burner is formed in the low heat generation amount gas adjusting part. Is the gist.

In the combustion apparatus according to the first aspect of the present invention having the above structure, when the fuel gas has a high calorific value, the opening degree of the main passage is changed by the gas amount adjusting means, so that the fuel gas is supplied to the burner. The amount is adjusted. When the fuel gas amount is reduced by the gas amount adjusting means, the gas amount increasing means provided in the bypass flow path bypassing the gas amount adjusting means temporarily increases the fuel gas amount at the time of the ignition operation. That is,
When the fuel gas amount is narrowed, the purge time is shortened because the fuel gas amount temporarily increases at the time of ignition. On the other hand, when the fuel gas has a low calorific value, the gas pressure control means provided in the bypass flow path bypassing the gas flow control means keeps the fuel flow in the bypass flow path while the gas flow control means keeps the main flow path fully closed. The gas pressure is controlled, and the opening degree of the bypass passage is changed by the bypass flow rate adjusting means, so that the fuel gas amount to the burner is adjusted. That is, since the fuel gas is controlled by the gas pressure control means for controlling the fuel gas pressure and supplied to the burner, the fuel gas does not become excessive. Therefore, the purging time can be shortened when the fuel gas has a high calorific value, and the function required for each fuel gas can be performed such that the fuel gas is not excessive when the calorific value is low.

Further, the present invention having the above-mentioned structure has a second aspect.
The combustion device according to claim 1, wherein the combustion device according to claim 1,
Depending on whether the fuel gas is for a low calorific value or a high calorific value, a gas amount adjusting unit is selectively incorporated. This gas amount adjustment unit
It has a cylindrical surface that partitions the main flow path, and is provided at the junction of the bypass flow path and the main flow path. For the high calorific value, the downstream communication part communicates with the downstream side of the main flow path at a predetermined opening regardless of the adjustment operation, and the upstream flow path of the main flow path at the upstream flow path opening interlocks with the adjustment operation. When the road opening is changed and the fuel gas amount is reduced, the gas amount increasing means provided in the bypass passage temporarily increases the fuel gas amount during the ignition operation.
On the other hand, in the case of the low calorific value, the opening of the flow path on the upstream side of the main flow path is closed irrespective of the adjustment operation, and the opening of the flow path on the downstream side of the main flow path at the downstream flow path opening is linked to the adjustment operation. The degree can be changed. That is, the flow path opening of the bypass flow path is changed at the downstream flow path opening in conjunction with the adjustment operation. Then, gas pressure control means provided in the bypass passage limits the fuel gas pressure in the bypass passage to a predetermined pressure. Therefore, the flow path for low (high) calorific value can be easily changed from the flow path for low (high) calorific value to the flow path for high (low) calorific value by rearranging the gas amount adjusting section.
As a result, it is easy to remodel or change the high calorific value and the low calorific value.

[0010] Further, according to the present invention having the above structure,
The combustion device according to claim 2, wherein the combustion device according to claim 2,
Depending on whether the fuel gas is for a low calorific value or a high calorific value, a gas amount adjusting unit is selectively incorporated. And, for the high calorific value, the fuel gas is supplied to the sensing burner from the upstream of the bypass flow path and supplied at the supply gas pressure, so that the purge time is shortened. In the case of the high calorific value, since the fuel gas amount is regulated by the nozzle, there is no problem even if the supply is performed at the supply gas pressure. On the other hand, in the case of the low calorific value, the fuel gas is supplied to the sensing burner while the fuel gas pressure is controlled by the gas pressure control means in the bypass passage, so that the fuel gas does not become excessive. Therefore, the flow path for low (high) calorific value can be easily changed from the flow path for low (high) calorific value to the flow path for high (low) calorific value by rearranging the gas amount adjusting section. As a result, it is easy to remodel or change the high calorific value and the low calorific value.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of a combustion apparatus of the present invention will be described below. As shown in FIG. 1, a gas water heater, which is one of the combustion devices, burns a mixture of fuel gas and primary air, and heats water passed by the combustion heat of the burner 11. A heat exchanger 12.

The burner 11 includes a sensing burner 13 that lifts a combustion flame in an oxygen-deficient atmosphere, a thermocouple 14 in which a thermoelectromotive force is reduced in an oxygen-deficient atmosphere due to the combustion flame of the sensing burner 13, and a combustion flame. A frame rod 15 for detection and an electrode 16 for performing ignition discharge on fuel gas at the time of ignition operation are provided. These thermocouples 1
4, frame rod 15, electrode 16
7 is electrically connected.

A push button 19 is provided in the water supply path from the water inlet.
A water faucet 25 for opening and closing the flow path by manual operation is provided, and a water pressure responsive device 31 for generating a pushing force by a differential pressure generated by water flow is provided downstream thereof. Then, the water flows from the hydraulic pressure responsive device 31 to the heat exchanger 12 to reach the tap.
The hydraulic pressure responsive device 31 is provided with a spindle 37 for transmitting responsive power on the same axis, and the other end of the spindle 37 is provided with an automatic water supply gas valve 26. The water supply automatic gas valve 26 is urged to close in the downstream direction of the gas flow path, and when water is passed, the responsive force of the hydraulic pressure responsive device 31 overcomes this urging force to open the gas flow path.

A gas supply path from the gas inlet to the burner 11 is electrically connected to the controller 17 and generates an electromagnetic force by dry cell power for a predetermined time from the ignition operation to forcibly open and hold the gas flow path. An on-off valve 18 is provided.

An automatic water supply gas valve 26 described above is provided downstream of the on-off valve 18, and a push button 19 is provided downstream thereof.
Stopper 2 for opening and closing the gas passage by manual operation
0 is provided. Downstream of the instrument plug 20, there is provided a gas amount control unit 2 that changes the degree of opening of the flow path by a rotation or slide operation, and the main flow path 2 leading to the burner 11.
1 (hereinafter referred to as “main flow path 21 a” upstream of the main flow path 21 and “main flow path 21 a
b "). In addition, a bypass flow path 22 is provided upstream of the gas flow control unit 2, which branches off from the main flow path 21 a and joins in the gas flow control unit 2.
The governor 1 for increasing the gas amount is provided in the middle of the process (hereinafter, the governor 1 for increasing the gas amount is connected to the bypass passage 22).
Is referred to as “bypass flow path 22a” and the downstream is referred to as “bypass flow path 22b”). Further, a small flow path 23a branched from the main flow path 21a (or the bypass flow path 22a) and leading to the sensing burner 13 (hereinafter, when distinguishing the upstream and downstream of the small flow path 23, the gas amount adjusting unit For 2,
The upstream is referred to as “small flow path 23a”, and the downstream is referred to as “small flow path 23b”).

First, a gas water heater in which the applied fuel gas has a high calorific value will be described. The fuel gas used in this gas water heater is mainly composed of natural gas such as methane or propane (Wobbe index WI = calorific value H / √specific gravity d> 100).
00) (hereinafter referred to as high calorific value fuel gas). For example, city gas is classified into 11A, 12A, and 13A gas groups. As shown in FIG. 2, the gas amount adjusting unit 2 is a cylindrical unit 2 that can be freely rotated.
a is formed. The cylindrical portion 2a has a main flow passage 21a passing from the gas inlet through an on-off valve 18, an automatic water supply gas valve 26, an instrument plug 20, and a main flow passage 21b leading to the burner 11.
The small flow path 23a branched from the main flow path 21a (or the bypass flow path 22a) and the opening of the small flow path 23b communicating with the sensing burner 13 abut. Then, the end 2b of the cylindrical portion 2a opens in the downstream direction of the gas amount increasing governor 1, and a through hole 2c is formed in the outer peripheral surface of the cylindrical portion 2a. The through hole 2 c is always fully opened regardless of the adjustment position of the gas amount adjustment unit 2, and the main flow passage 2 communicating with the burner 11 is provided.
1b is formed. Further, another through hole 2e for changing the opening of the main flow path 21a is formed on the outer peripheral surface opposite to the through hole 2c with respect to the central axis. And
By rotating the gas amount adjusting unit 2, the opening degree of the main flow path 21a that abuts is changed. Further, the main flow path 21a and the bypass flow path 22 merge in the cylindrical portion 2a. The opening degree of the through hole 2e is set to be large when adjusted to the maximum fuel gas amount and to be fully closed when adjusted to the minimum, and the opening degree can be varied steplessly from the maximum to the minimum. It is provided as follows. A groove 2d is provided on the outer peripheral surface near the end 2b of the cylindrical portion 2a, and the small flow path 23a abuts the position of the groove 2d, and the small flow path 23b passes from the small flow path 23a through the groove 2d. After that, it leads to the sensing burner 13. This gas water heater uses a fuel gas having a high calorific value, and the upper limit of the fuel gas amount is regulated by a nozzle diameter (not shown) provided in the burner 11 and the sensing burner 13.

The governor 1 for increasing the amount of gas provided in the bypass passage 22 has a flexible diaphragm 3 made of synthetic rubber. The diaphragm 3 has its entire outer periphery sealed in an airtight manner and divides the inside of the casing into a valve chamber through which fuel gas passes and a back pressure chamber 5 opened to the atmosphere. Also,
A seat portion 6 is formed coaxially with the diaphragm 3 at a step portion formed on the side wall of the valve chamber, a primary chamber 4a is formed upstream of the seat portion 6, and a secondary chamber 4b is formed downstream of the seat portion 6. . The movable valve element 7 inserted into the seat portion 6 of the gas amount increasing governor 1 has an umbrella portion formed at one end and a small-diameter portion formed at the other end, and the umbrella portion is installed downstream of the seat portion 6. It comes into contact with and separates from the sheet part 6. The small diameter portion inserted into the seat portion 6 is fixed to the center hole of the diaphragm 3. A return spring 8 for urging the movable valve element 7 in the valve opening direction is provided in the back pressure chamber 5. Therefore, the gas amount increasing governor 1 is a so-called top inflow type gas governor, and the fuel gas flows from the primary chamber 4a to the secondary chamber 4b via the seat portion 6. And
The gas volume increasing governor 1 is provided with a small hole 5a communicating with the outside air to the back pressure chamber 5, and except for the small hole 5a, the back pressure chamber 5 is provided.
Is sealed. The small holes 5a vary depending on the shape of the gas amount increasing governor 1, but are, for example, about φ0.2 to φ0.3 m.
m size.

Next, each operation will be described with reference to FIGS. When the ignition operation is performed by the operation button 19,
The operation switch 24 is turned on by moving the operation button 19.
At the same time, the instrument tap 20 and the faucet 25 are opened mechanically. Then, when the faucet 25 is opened, the flow of water is started, a reaction force is generated in the hydraulic pressure responsive device 31, and the interlocking spindle 37 overcomes the force of the spring 32 and opens the automatic hydraulic pressure valve 26. At the same time, when the water pressure switch 49 is turned on by the advance of the spindle 37 (movement to the left in the figure), the controller 17 uses the dry cell power to
To start discharge and open the on-off valve 18. Then, the fuel gas starts flowing in the gas supply path to the burner 11.

When the gas water heater has not been used until immediately before ignition and has been left for a long time, the air in the gas flow path from the appliance plug 20 which is the most downstream valve to the burner 11 is replaced with air. When the gas amount adjusting unit 2 is adjusted to the maximum fuel gas amount, the through hole 2e of the gas amount adjusting unit 2
Is fully opened, and fuel gas reaches the burner 11 from the instrument plug 20 via the main flow path 21a → the through hole 2e → the main flow path 21b. Therefore, most of the fuel gas flows quickly to the burner 11 and the sensing burner 13 without passing through the gas amount increasing governor 1 in the bypass passage 22 replaced with air.

On the other hand, when the gas amount adjusting unit 2 is adjusted to the minimum fuel gas amount, as shown in FIG. 3, the through hole 2e of the gas amount adjusting unit 2 is fully closed, The gas reaches the burner 11 from the instrument plug 20 via the gas flow increasing governor 1 in the bypass flow path 22. Then, the diaphragm 3 of the gas amount increasing governor 1 tends to move toward the back pressure chamber 5 by overcoming the force of the return spring 8 by the fuel gas pressure flowing into the valve chamber. At this time, since the back pressure chamber 5 is sealed except for the small hole 5a, the diaphragm 3 moves slowly while pushing out the air in the back pressure chamber 5 from the small hole 5a.
For this reason, the movable valve element 7 fixed to the diaphragm 3
It takes time to reach a balanced opening from the fully open state,
The fully open state continues for a while after the ignition operation. The graph shown in FIG. 4 is a graph comparing the fuel gas pressure in the burner 11 immediately after ignition with the conventional combustion device when the gas amount is adjusted to the minimum by the gas amount adjusting unit 2. FIG. 1B shows the conventional fuel cell and FIG. 2A shows the fuel cell according to the present embodiment. In the conventional fuel cell, although the fuel gas increases instantaneously immediately after the ignition, the fuel gas amount stabilizes immediately. On the other hand, in the present embodiment, the fuel gas amount is kept at the maximum gas amount limited by the nozzle for a while, and then the predetermined fuel gas amount, that is, the fuel gas amount adjusted by the gas amount adjusting unit 2. The pressure becomes stable. Therefore, even if the gas amount adjusting section 2 is adjusted to the minimum fuel gas amount, immediately after the ignition operation, the fuel gas amount is maximized and supplied to the burner 11. Moreover, after the combustion is started, the fuel gas amount is adjusted by the gas amount adjusting unit 2.

After a lapse of a predetermined time from the ignition operation,
When the flame is detected by the flame rod 15 and the thermoelectromotive force of the thermocouple 14 is equal to or higher than a predetermined level, the controller 17 determines that the combustion is performed normally and keeps the energized state to the on-off valve 18 as it is. Maintain and keep the valve open.
In addition, during the combustion, the controller 17 monitors whether the combustion flame has disappeared by the flame rod 15 and also monitors the combustion state by the thermoelectromotive force of the thermocouple 14. If it is determined that the valve is abnormal, the on-off valve 1
Then, the supply of fuel gas to the burner 11 is stopped, and the combustion is stopped.

If a fire extinguishing operation is performed during combustion, the appliance plug 20 is closed and the primary chamber 4 of the governor 1 for increasing the gas amount is closed.
The pressure of the fuel gas in a decreases, and while the outside air is sucked into the back pressure chamber 5 from the small hole 5a, the diaphragm 3 retreats slowly. If the re-ignition operation is performed during the retreat, the diaphragm 3 moves forward to the predetermined position from the opening degree during the retreat.
In this case, since the gas flow path is filled with the fuel gas, the purging itself becomes unnecessary, the time for keeping the fuel gas amount at the maximum is shortened, and the strong heating power is not continued more than necessary, which is convenient.

As described above, the fuel gas amount is maximized at the time of ignition and the purge time can be shortened regardless of the opening degree of the gas amount adjusting section 2. Moreover, the through hole 2e adjusted by the gas amount adjusting unit 2 with a simple structure.
The bypass flow rate can be changed according to the opening of the
As the fuel gas amount is reduced, the fuel gas amount in the bypass passage 22 can be increased. Also, if it is set to the maximum opening and there is no need to temporarily increase the amount of fuel gas,
In order not to pass through the bypass passage 22, the bypass passage 2
It is not necessary to perform the purging of step 2. Therefore, even in the ignition operation after being left for a long time, the ignition can be performed quickly and reliably, and the purge time is shortened. Therefore, the start timing of the non-ignition determination can be advanced, and when the ignition is not performed, In addition, the amount of raw gas emission is reduced, and safety can be improved.

Next, a gas heater in which the applied fuel gas has a low calorific value will be described. As shown in FIGS. 5 to 7, in the combustion device for the low heat value compared to the high heat value, the gas amount adjusting unit 9 is different, and the main flow passage 21 and the flow passage 23 to the sensing burner 13 are different. different. Compared to a combustion device having a high calorific value, a combustion device for a low calorific value has a small calorific value of fuel gas per unit amount and a large supply flow rate to the burner 11 to shorten a purge time. There is no need to maximize the volume. Instead, a gas pressure controlling governor 10 is incorporated in place of the gas amount increasing governor 1 so as to quickly control the fuel gas amount to a predetermined amount so that the fuel gas does not become excessive.

In the gas pressure controlling governor 10, the small holes 5b provided in the back pressure chamber 5 are larger than the small holes 5a of the gas increasing governor 1 so that the diaphragm 3 moves quickly upon detecting the gas pressure. The difference is the opening. For this reason,
In the gas pressure control governor 10 for low heat generation, the diaphragm 3 moves quickly, and can control the fuel gas immediately after the ignition operation.

The gas amount adjusting section 9 for the low heat value and the gas amount adjusting portion 2 for the high heat value are different in the through holes 2c, 2e, 9c and the passage hole 9d. In the gas amount adjusting section 9 for low heat generation,
A through hole 9c for changing an opening degree to the main flow path 21b by a rotation operation is formed, and the main flow path 2 upstream of the gas amount adjusting unit 9 is formed.
1a and the small flow path 23a are closed by the cylindrical surface 9a. Therefore, the fuel gas to the burner 11 is always supplied to the bypass passage 22.
Via the governor 10 for gas pressure control. Further, the gas amount adjusting portion 9 is not provided with the groove 2d on the outer peripheral surface, but is provided with a passage hole 9d communicating with the inside of the cylinder on the outer peripheral surface on the small flow path 23b side communicating with the sensing burner 13. When the gas amount adjusting section 9 is incorporated, the bypass flow path 22 b downstream of the gas pressure control governor 10 branches into a main flow path 21 b to the burner 11 and a small flow path 23 b to the sensing burner 13 in the cylinder. Is done.

Next, each operation will be described with reference to FIGS. When the ignition operation is performed by the operation button 19,
The on-off valve 18, the automatic water pressure valve 26, and the instrument stopper 20 are opened,
The fuel gas starts flowing in the gas supply path to the burner 11.
In this case, the main flow path 21a and the small flow path 23a
It is closed by the gas amount adjusting unit 2. Therefore, the fuel gas flows into the gas amount adjusting unit 2 via the bypass flow path 22a → the gas pressure control governor 10 → the bypass flow path 22b.

In the governor 10 for controlling gas pressure, the small hole 5b on the back pressure chamber 5 side is provided larger than the small hole 5a of the governor 1 for increasing gas amount. As a result, it overcomes the force of the return spring 8 and quickly moves to the back pressure chamber 5 side. For this reason, the diaphragm 3
The movable valve element 7 fixed to is quickly moved from the fully opened state to a balanced opening degree and starts controlling the fuel gas pressure. The fuel gas that has flowed into the gas amount adjusting section 2 from the bypass flow passage 22a is branched in the cylinder, one of which flows from the through hole 9c to the burner 11 via the main flow passage 21b, and the other flows into the burner 11 through the passage hole 9d. Sensing burner 13 via flow path 23a
Flows to

When the gas amount adjusting section 2 is rotated, the opening of the through hole 9c changes, and fuel gas corresponding to the opening is supplied to the burner 11. Further, even when the passage hole 9d of the gas amount adjusting section 2 is rotated, a predetermined opening degree is maintained, and a predetermined amount of fuel gas is supplied to the sensing burner 13. The fuel gas to the burner 11 and the sensing burner 13 is supplied to the gas pressure controlling governor 10 while being controlled to a predetermined fuel gas pressure.

As described above, the purge time is shortened when the fuel gas has a high calorific value, and the fuel gas is not excessively large when the fuel gas has a low calorific value. Further, by reassembling the gas amount adjusting section, the flow path for the low (high) heat value can be changed to the flow path for the high (low) heat value. Therefore, as is clear from the comparison between FIG. 2 and FIG. 6, the main components are shared as they are for the low heat generation amount and the high heat generation amount only as the gas amount adjustment unit and the governor back pressure chamber are different. be able to. That is, the compatibility between the low calorific value and the high calorific value can be easily modified or changed only by exchanging the gas amount adjusting unit and the back pressure chamber except for the burner and the sensing burner nozzle.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention. It is.

[0032]

As described in detail above, claim 1 of the present invention
According to the combustion device described, the purging time is shortened when the fuel gas has a high calorific value, and the fuel gas is not excessively increased when the calorific value is low. It has an excellent effect that it can be performed. Therefore, the main parts can be shared as they are,
It is possible to provide compatibility between a low heating value and a high heating value.

Further, according to the combustion apparatus of the second aspect of the present invention, in the combustion apparatus of the first aspect, by rearranging the gas amount adjusting section, the flow amount of the low (high) heat generation can be increased. (Low) It can be easily changed to a flow path for a calorific value. Therefore, the main parts can be shared as they are,
It is possible to provide compatibility between a low heating value and a high heating value.

According to the combustion apparatus of the third aspect of the present invention, in the combustion apparatus of the second aspect, the flow path to the sensing burner in addition to the burner can be provided by rearranging the gas amount adjusting section. The flow path for low (high) heat value can be easily changed to the flow path for high (low) heat value. Therefore, the main parts can be shared as they are,
It is possible to provide compatibility between a low heating value and a high heating value.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a combustion device according to an embodiment of the present invention (for a high calorific value).

FIG. 2 is a diagram showing a gas amount adjusting section for a high heat value and a gas amount increasing governor (at the time of maximum adjustment).

FIG. 3 is a diagram showing a gas amount adjusting section for high heat generation and a gas amount increasing governor (at the time of minimum adjustment).

FIG. 4 is a graph obtained by an experiment comparing an example of the present invention with a conventional product.

FIG. 5 is a schematic configuration diagram of a combustion device according to an embodiment of the present invention (for a low calorific value).

FIG. 6 is a diagram showing a gas amount adjusting section and a gas governor for a low heat value (at the time of maximum adjustment).

FIG. 7 is a view showing a gas amount adjustment unit and a gas governor for a low heat value (at the time of minimum adjustment).

FIG. 8 is a schematic configuration diagram of a conventional combustion device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 gas amount increasing governor 2 gas amount adjusting unit 3 diaphragm 5 back pressure chamber 5 a small hole 7 movable valve 8 return spring 10 gas pressure control governor 11 burner 13 sensing burner 14 thermocouple 15 frame rod 16 electrode 21 main flow path 22 Bypass flow path

Claims (3)

[Claims] 1. A main flow path for supplying fuel gas to a burner, gas amount adjusting means for adjusting an amount of fuel gas by changing an opening degree of the main flow path, and forcibly for a predetermined period from an ignition operation. A combustion device provided with forced valve opening means for opening the main flow path, wherein a bypass flow path bypassing the gas amount adjusting means is provided, and when the fuel gas has a high calorific value, the fuel amount is adjusted by the gas amount adjusting means. Gas amount increasing means for temporarily increasing the amount of fuel gas during the ignition operation when the gas amount is reduced is provided in the bypass flow path, and when the fuel gas has a low calorific value, the gas amount increasing means is replaced with the gas amount increasing means. Gas pressure control means for limiting the fuel gas pressure of the bypass flow path to a predetermined pressure, and while the main flow path is fully closed instead of the gas amount adjustment means, the opening degree of the bypass flow path is Change to burner burner Combustion apparatus characterized by comprising a bypass flow rate adjusting means for adjusting the amount of gas. 2. A gas flow rate adjusting section is provided at a junction of the bypass flow path and the main flow path with a cylindrical surface partitioning the main flow path. A downstream communication portion that communicates with the cylindrical surface at a predetermined opening degree with the downstream side of the main flow path irrespective of the adjustment operation, and an upstream that changes the flow opening degree on the upstream side of the main flow path in conjunction with the adjustment operation A flow path opening, wherein the gas amount adjustment section for low heat generation closes the flow path opening on the upstream side of the main flow path on the cylindrical surface regardless of the adjustment operation, and is interlocked with the adjustment operation A downstream flow path opening that changes the degree of flow opening on the downstream side of the main flow path, wherein the gas amount adjustment unit is selected and incorporated according to the level of heat generation of the fuel gas used. The combustion device according to claim 1, wherein 3. A gas burner for detecting a combustion state, wherein a flow passage from the upstream of the bypass flow passage to the sensing burner is formed in the gas amount adjustment section for a high heat generation amount. 3. The combustion device according to claim 2, wherein a flow passage from the inside of the cylinder to the sensing burner is formed in the gas amount adjusting section.