JP2010019450A - Combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable direct ignition at an igniting section by more quickly jetting a mixed gas of a fuel gas and an oxygen gas. <P>SOLUTION: This combustion device 1 includes a torch 30 connected with a fuel gas supply pipe conduit 10 and an oxygen gas supply pipe conduit 20 and jetting the mixed gas of the fuel gas and the oxygen gas supplied from the pipe conduits, and a control section for adjusting a flow rate of the fuel gas supplied from the fuel gas supply pipe conduit 10 to the torch 30, and a flow rate of the oxygen gas supplied from the oxygen gas supply pipe conduit 20 to the torch 30. The control section adjusts a ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas to be higher than a prescribed range during the lapse of a prescribed time from the start of supply of the fuel gas, and adjusts the flow rate of the fuel gas and the flow rate of the oxygen gas to keep the ratio within the prescribed range after the lapse of the prescribed time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a combustion apparatus that ejects a mixed gas of a fuel gas supplied from a fuel gas supply pipe and an oxygen gas supplied from an oxygen gas supply pipe.

A combustion apparatus used for brazing work or the like mixes a fuel gas supplied from a fuel gas supply line and an oxygen gas supplied from an oxygen gas supply line with a torch (mixing line), and A mixed gas is ejected from the crater (see, for example, Patent Document 1). Then, the worker brings the torch from which the mixed gas is ejected close to the ignition unit to form a brazing flame. At this time, the mixing pipe in the torch is filled with oxygen gas and fuel gas so that the brazing flame becomes a flame suitable for brazing work (a flame with a white core length of about 30 mm to 35 mm). Supplied at an appropriate ratio.
Japanese Utility Model Publication No. 1-114159

  However, when the supply of the above-described oxygen gas and fuel gas is started at an appropriate ratio, only oxygen gas arrives at the crater of the torch, and the operator does not ignite for a while even if the operator approaches the torch. There is. This is because when the torch is hooked on the hook after the work is completed, the backfire prevention mechanism works, and oxygen gas continues to be released for several seconds after the hook is hooked, and the fuel gas in the fuel gas supply line is released. Therefore, there is no fuel gas in the torch and fuel gas supply line, but oxygen gas remains in the torch and oxygen gas supply line and remains in the torch and oxygen gas supply line when the work is performed again. This is because only oxygen gas reaches the crater of the torch.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a combustion apparatus that enables one ignition in an ignition unit by ejecting a mixed gas of fuel gas and oxygen gas earlier. The purpose is to provide.

  A combustion apparatus according to a first aspect of the present invention is connected to a fuel gas supply line and an oxygen gas supply line, respectively, and a merging line that ejects a mixed gas of fuel gas and oxygen gas supplied from these lines, Gas amount adjusting means for adjusting the flow rate of the fuel gas supplied from the fuel gas supply line to the merge line and the flow rate of the oxygen gas supplied from the oxygen gas supply line to the merge line, respectively. The adjusting means adjusts the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas to be larger than the predetermined range until the predetermined time elapses after starting the supply of the fuel gas, and after the predetermined time has elapsed Adjust the flow rate of the fuel gas and the flow rate of the oxygen gas so that the ratio is within a predetermined range.

  In this combustion apparatus, the fuel gas side is pulled up by increasing the ratio of the flow rate of oxygen gas to the flow rate of fuel gas until a predetermined time elapses after the supply of fuel gas to the fuel gas supply line is started. The fuel gas is attracted to the merging pipeline and the fuel gas can reach the merging pipeline faster. Accordingly, since the mixed gas of the fuel gas and the oxygen gas can be ejected earlier, one ignition can be performed in the ignition unit.

  A combustion apparatus according to a second aspect is the combustion apparatus according to the first aspect, wherein the gas amount adjusting means starts the supply of the fuel gas and the supply of the oxygen gas almost simultaneously.

  In this combustion apparatus, the supply of the fuel gas and the supply of the oxygen gas are started almost at the same time, but the time until the fuel gas reaches the merge pipe and the time until the oxygen gas reaches the merge pipe When there is a variation in time, increasing the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas increases the flow rate of the oxygen gas in the merging pipeline so that the fuel gas can reach the merging pipeline earlier. it can.

  A combustion apparatus according to a third aspect of the present invention is the combustion apparatus according to the first or second aspect of the present invention, further comprising a support portion that supports the merging pipe line, and the gas amount adjusting means includes a support part that has the merging pipe line. When the state is changed from the supported state to the unsupported state, supply of fuel gas and supply of oxygen gas are started.

  In this combustion apparatus, the gas supply is started simply by removing the junction pipe from the support section.

  A combustion apparatus according to a fourth invention is the combustion apparatus according to any one of the first to third inventions, wherein the oxygen gas supply pipe connects the oxygen gas supply source and the merge pipe to the merge pipe. A first supply passage including a flow regulator for adjusting the flow rate of the supplied oxygen gas, an oxygen gas supply source, and a first supply passage connected to a position closer to the merging pipeline than the flow regulator in the first supply passage. The gas amount adjusting means joins from both the first supply channel and the second supply channel until a predetermined time elapses after the supply of the fuel gas is started. After oxygen gas is supplied to the pipe line and a predetermined time has elapsed, the oxygen gas is supplied from only the first supply flow path to the merge pipe line by closing the second supply flow path.

  In this combustion apparatus, the amount of oxygen gas can be increased with a simple configuration.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, the fuel gas side is controlled by increasing the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas until a predetermined time elapses after the supply of the fuel gas to the fuel gas supply pipe is started. The fuel gas is attracted to the merging pipeline by the suction pressure, so that the fuel gas can quickly reach the merging pipeline. Accordingly, since the mixed gas of the fuel gas and the oxygen gas can be ejected earlier, one ignition can be performed in the ignition unit.

  In the second invention, the supply of the fuel gas and the supply of the oxygen gas are started almost simultaneously. However, the time until the fuel gas reaches the merge pipe and the oxygen gas reach the merge pipe. If there is a variation in the time to complete, increasing the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas increases the flow rate of the oxygen gas in the merge line, and the fuel gas reaches the merge line quickly. Can be made.

  In the third aspect of the invention, the gas supply is started simply by removing the junction pipe from the support portion.

  In the fourth invention, the amount of oxygen gas can be increased with a simple configuration.

  Hereinafter, embodiments of a combustion apparatus according to the present invention will be described based on the drawings.

  FIG. 1 is an external view of a combustion apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the combustion apparatus shown in FIG. FIG. 3 is a schematic diagram showing the inside of the torch immediately after the start of gas supply and after a predetermined time has elapsed. Hereinafter, with reference to FIGS. 1-3, the structure of the combustion apparatus 1 which concerns on this embodiment is demonstrated in detail.

  The combustion apparatus 1 of this embodiment burns a mixed gas obtained by mixing oxygen gas and fuel gas to form a brazing flame. As shown in FIG. 1, the combustion apparatus 1 includes a fuel gas supply line 10, an oxygen gas supply line 20, a torch (confluence) connected to the fuel gas supply line 10 and the oxygen gas supply line 20. (Pipe) 30, a saver 40 that switches between supply and stop of fuel gas and oxygen gas, a support lever 50 that supports the torch 30, and a pilot burner 60 that serves as an ignition unit.

  The fuel gas supply line 10 is provided for supplying fuel gas to the torch 30. As shown in FIG. 2, the fuel gas supply pipe 10 is provided with an electromagnetic valve 41 and a flow path adjuster 11 that adjusts the opening degree of the electromagnetic valve 41. Thus, the flow rate of the fuel gas supplied from the fuel gas supply source is adjusted by the electromagnetic valve 41 and supplied to the torch 30.

  The oxygen gas supply line 20 is provided to supply oxygen gas to the torch 30 and includes a main line 20a serving as a main line and a bypass line 20b. An electromagnetic valve 42 and a flow path adjuster 21 that adjusts the opening degree of the electromagnetic valve 42 are provided on the main line 20a. Thereby, the flow rate of the oxygen gas supplied from the oxygen gas supply source is adjusted by the electromagnetic valve 42 and supplied to the torch 30.

  Here, in the present embodiment, the bypass conduit 20b is provided to increase the flow rate of oxygen gas passing through the main conduit 20a. The bypass line 20b is connected to an oxygen gas supply source and a position closer to the torch 30 than the flow path regulator 21 in the main line 20a. The bypass pipe 20b is provided with an electromagnetic valve 22 and a flow path adjuster 23 that adjusts the opening degree of the electromagnetic valve 22. In the present embodiment, as shown in FIG. 3, the electromagnetic valve 22 is opened until 0.5 seconds have elapsed since the start of the supply of fuel gas, and closed after 0.5 seconds have elapsed. It is done. As a result, until a predetermined time (for example, 0.5 seconds) elapses after the supply of the fuel gas is started, the main line 20a is connected to the main line 20a via the bypass line 20b at about 1.5 l / min. Oxygen gas flows in and oxygen gas is supplied to the torch 30 from both pipelines 20a and 20b. After 0.5 seconds, the solenoid valve 22 is closed to allow oxygen gas to flow only from the main pipeline 20a to the torch 30. Supplied. As a result, the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas becomes a ratio suitable for ignition (for example, 68% to 74%) from the start of the supply of the fuel gas until 0.5 seconds elapses. After 0.5 seconds, the ratio becomes an appropriate ratio (for example, 55% to 63%). The “appropriate ratio” is a ratio such that the brazing flame becomes a flame suitable for brazing work (a flame having a white core length of about 30 mm to 35 mm).

  As shown in FIGS. 1 and 2, the torch 30 is supported by a support lever 50 described later, and is used by being detached from the support lever 50 during brazing work. The torch 30 is a cylindrical member through which fuel gas and oxygen gas pass. The torch 30 is provided with a crater 31 at one end, and the oxygen gas supply pipe 20 is connected to the other end. An oxygen gas side connection portion 32 is provided. Further, a fuel gas side connection portion 33 to which the above-described fuel gas supply pipe 10 is connected is provided on the side surface of the torch 30. The oxygen gas side connection portion 32 and the fuel gas side connection portion 33 are opened in directions different from each other by 90 °, and the connection direction of the oxygen gas supply pipe 20 to the torch 30 and the fuel gas supply pipe to the torch 30. 10 connection directions are different from each other by 90 °. For this reason, the fuel gas merges in the direction perpendicular to the flow direction of the oxygen gas.

  The saver 40 has the above-described electromagnetic valves 41 and 42, adjusts the flow rate of the fuel gas supplied from the fuel gas supply line 10 to the torch 30, and supplies it from the oxygen gas supply line 20 to the torch 30. It has a function of adjusting the flow rate of the oxygen gas.

  As shown in FIG. 1, the support lever 50 is provided for hooking and supporting the torch 30. The support lever 50 has one end supported by a support block in the saver 40 and the other end swingable in the vertical direction. The other end is substantially V-shaped for hooking the torch 30. When the torch 30 is hooked, the other end is swung downward by the weight of the torch 30, and when the torch 30 is removed, the other end is illustrated. In response to the urging force of the leaf spring not to be swung upward. In this embodiment, when the support lever 50 is changed from the state where the torch 30 is supported to the state where it is not supported, the supply of fuel gas and oxygen gas to the torch 30 and the pilot burner 60 is started. Specifically, when the support lever 50 is changed from the state in which the torch 30 is supported to the state in which it is not supported, the contact of the limit switch 51 (see FIG. 4) is switched, and the electromagnetic valves 41 and 42 described above are opened. Thus, supply of fuel gas and oxygen gas to the torch 30 and the pilot burner 60 is started. At this time, the supply of fuel gas and the supply of oxygen gas are started almost simultaneously. Contrary to the above, when the support lever 50 changes from a state in which the torch 30 is not supported to the support lever 50, the supply of fuel gas and oxygen gas to the torch 30 and the pilot burner 60 is stopped. Specifically, when the support lever 50 changes from a state in which the torch 30 is not supported to a state in which the torch 30 is supported, the contact of the limit switch 51 is switched, the electromagnetic valves 41 and 42 are closed, and the torch 30 and pilot Supply of fuel gas and oxygen gas to the burner 60 is stopped. At this time, the backfire prevention mechanism works, and only oxygen gas continues to be released for about 2 seconds after the torch 30 is supported by the support lever 50. For this reason, the fuel gas in the torch 30 and the fuel gas supply pipe 10 is eliminated, but the oxygen gas remains in the torch 30 and the oxygen gas supply pipe 20.

  The pilot burner 60 is provided for igniting the mixed gas ejected from the crater 31 of the torch 30. When the pilot burner 60 changes from the state in which the torch 30 is supported to the state in which the torch 30 is not supported, the ignition plug is activated to form an ignition flame.

FIG. 4 is a control block diagram of the combustion apparatus shown in FIG.
As shown in FIG. 4, the combustion device 1 is provided with a control unit 70 configured by a microcomputer, a memory, and the like. The control unit 70 receives signals transmitted from the respective units and controls the above-described electromagnetic valves 22, 41 and 42. The control unit 70 is connected to the electromagnetic valves 22, 41 and 42, the limit switch 51, the timer 52, the flow rate adjusting units 11, 21, 23 and the like so as to be communicable by wire or wirelessly. The timer 52 measures the time from the time when the contact of the limit switch 51 is switched, and the control unit 70 of the present embodiment controls the limit switch 51 based on a signal related to the time counted by the timer 52. The electromagnetic valve 22 is opened until 0.5 seconds have elapsed since the contact point was switched, and after 0.5 seconds, the electromagnetic valve 22 is closed. As a result, the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas is 68% to 74% until 0.5 seconds elapse after starting the supply of the fuel gas, and after 0.5 seconds elapses The ratio is 55% to 63%.

  Next, an experiment demonstrating that a single ignition is possible in the pilot burner will be described. In this experiment, the ratio of the flow rate of oxygen gas to the flow rate of fuel gas was set to 68% to 74% and the supply was started, and the ratio of the flow rate of oxygen gas to the flow rate of fuel gas was 55% to 63%. Thus, it was investigated whether or not the single ignition could be performed with respect to the comparative example in which the supply was started. The above-mentioned “one-shot ignition” means that when the torch is brought close to the pilot burner, a brazing flame is immediately formed. The operator waits for a predetermined time with the torch brought close to the pilot burner. It is a concept that does not need to be done.

  First, in the comparative example, the flow rate of oxygen gas is changed from 5.5 l / min to 9.5 l / min so that the ratio of the flow rate of oxygen gas to the flow rate of fuel gas is within the range of 55% to 63%. In addition, the flow rate of the fuel gas was changed from 10.0 l / min to 15.0 l / min. Then, after removing the torch from the support lever, it was examined whether or not a single ignition could be performed when the torch crater was brought close to the pilot burner after 0.5 seconds had elapsed. The results are shown in Table 1 below.

  As shown in Table 1, in the comparative example in which the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas was within the range of 55% to 63%, none of the ignitions could be performed. This is probably because the fuel gas has not reached the crater after 0.5 seconds have elapsed after the torch is removed from the support lever.

  Next, in the embodiment, the flow rate of oxygen gas is from 3.5 l / min to 13.0 l / min so that the ratio of the flow rate of oxygen gas to the flow rate of fuel gas is within the range of 68% to 74%. At the same time, the flow rate of the fuel gas was changed from 7.3 l / min to 18.0 l / min. Then, after removing the torch from the support lever, it was examined whether or not a single ignition could be performed when the torch crater was brought close to the pilot burner after 0.5 seconds had elapsed. The results are shown in Table 2 below.

  As shown in Table 2, in each of the examples in which the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas was in the range of 68% to 74%, one ignition could be performed. This is because by increasing the flow rate of oxygen gas relative to the fuel gas as compared with the comparative example, the fuel gas reaches the crater faster, and 0.5 seconds before the torch is removed from the support lever, This is thought to be because the mixed gas of fuel gas and oxygen gas reaches the crater.

  In the examples, all can be ignited, but the flame is not suitable for brazing work (flame having a white core length of about 20 mm to 30 mm). The ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas needs to be within a range of 55% to 63% so that an appropriate flame is obtained.

[Characteristics of Combustion Device 1 of the Present Embodiment]
The combustion apparatus 1 of the present embodiment has the following characteristics.

  In the combustion apparatus 1 of the present embodiment, the fuel gas in the torch 30 and the fuel gas supply pipe 10 is eliminated by the function of the above-described backfire prevention mechanism. However, the fuel gas is supplied to the fuel gas supply pipe 10. Until a predetermined time has elapsed from the start of the operation, by increasing the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas, the fuel gas side becomes a suction pressure, and the fuel gas is attracted to the merging pipe line. The fuel gas can reach the torch 30 quickly. Therefore, since the mixed gas of fuel gas and oxygen gas can be ejected earlier, one ignition can be performed in the pilot burner 60.

  In the combustion apparatus 1 of the present embodiment, the supply of the fuel gas is started by increasing the flow rate of the oxygen gas until 0.5 seconds elapses after starting the supply of the fuel gas, and then decreasing the flow rate. Until 0.5 seconds elapses, the ratio of the flow rate of oxygen gas to the flow rate of fuel gas is a ratio suitable for ignition (for example, 68% to 74%). The ratio is such that the brazing flame becomes an appropriate flame for the brazing operation (for example, 55% to 63%).

  Further, as in this embodiment, in the combustion apparatus 1 in which the supply of the fuel gas and the oxygen gas is automatically started by removing the torch 30 from the support lever 50, the supply of the fuel gas and the supply of the oxygen gas are performed. The flow of oxygen gas with respect to the flow rate of the fuel gas is started at almost the same time, but still there is a variation in the time until the fuel gas reaches the torch 30 and the time until the oxygen gas reaches the torch 30. By increasing the ratio, the flow rate of oxygen gas in the torch 30 increases, and the fuel gas can reach the torch 30 quickly.

  In the combustion apparatus 1 of the present embodiment, supply of fuel gas and oxygen gas is automatically started only by removing the torch 30 from the support lever 50.

  Moreover, in the combustion apparatus 1 of this embodiment, since only the bypass line 20b is provided, the amount of oxygen gas can be increased with a simple configuration.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas is made larger than the predetermined range by increasing the flow rate of the oxygen gas. However, the present invention is not limited to this, and the flow rate of the fuel gas is reduced. Accordingly, the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas may be larger than a predetermined range.

  Moreover, although the said embodiment demonstrated the example which enlarges the flow volume of oxygen gas using a bypass pipe line, this invention is not restricted to this, By controlling the opening degree of a solenoid valve, the flow volume of oxygen gas is controlled. You may enlarge it.

  By using the present invention, it is possible to obtain a combustion apparatus that can perform one-shot ignition in the ignition unit by ejecting a mixed gas of fuel gas and oxygen gas earlier.

It is an external view of the combustion apparatus which concerns on one Embodiment of this invention. It is a schematic diagram of the combustion apparatus shown in FIG. It is the schematic diagram which showed the mode in the torch immediately after the gas supply start and after predetermined time progress. It is a control block diagram of the combustion apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustion apparatus 10 Fuel gas supply line 20 Oxygen gas supply line 20a Main line (1st supply flow path)
20b Bypass pipeline (second supply channel)
30 Torch (Joint pipeline)
40 Saver 50 Support lever (support part)
60 Pilot burner 70 Control unit

Claims (4)

A merging pipe that is connected to each of the fuel gas supply pipe and the oxygen gas supply pipe and jets a mixed gas of the fuel gas and the oxygen gas supplied from these pipes;
Gas amount adjusting means for adjusting the flow rate of the fuel gas supplied from the fuel gas supply line to the merge line and the flow rate of the oxygen gas supplied from the oxygen gas supply line to the merge line, respectively. ,
The gas amount adjusting means adjusts the ratio of the flow rate of the oxygen gas to the flow rate of the fuel gas to be larger than a predetermined range until a predetermined time elapses after the supply of the fuel gas is started, and the predetermined time After the elapse of time, the combustion apparatus adjusts the flow rate of the fuel gas and the flow rate of the oxygen gas so that the ratio falls within the predetermined range.   The combustion apparatus according to claim 1, wherein the gas amount adjusting unit starts supplying fuel gas and oxygen gas almost simultaneously. A support portion for supporting the merging pipeline;
The gas amount adjusting means starts supplying fuel gas and supplying oxygen gas when the support portion is not supported from the state where the support pipe is supported. 2. The combustion apparatus according to 2. The oxygen gas supply line is
A first supply flow path including a flow rate regulator that connects an oxygen gas supply source and the merging pipe and adjusts a flow rate of oxygen gas supplied to the merging pipe;
The oxygen gas supply source, and a second supply channel connected to a position closer to the merging pipeline than the flow rate regulator in the first supply channel,
The gas amount adjusting means supplies oxygen gas from both the first supply flow path and the second supply flow path to the junction pipe until a predetermined time elapses after the fuel gas supply is started. The oxygen gas is supplied from only the first supply flow path to the merge pipe line by closing the second supply flow path after the predetermined time has passed. The combustion apparatus according to any one of the above.

Images