Gas regulation and control system for flame brazing

Abstract

The utility model relates to a gas regulation and control system for flame brazing, which comprises a fuel gas pipeline, a first fuel gas electromagnetic valve, a fuel gas mass flow controller and a second fuel gas electromagnetic valve are sequentially arranged on the fuel gas pipeline along the flow direction of gas; an air electromagnetic valve and an air mass flow controller are arranged on the air pipeline; an oxygen electromagnetic valve and an oxygen mass flow controller are arranged on the oxygen pipeline; the flame-retardant gas pipeline comprises a fuel gas mass flow controller cleaning pipeline, an anti-backfire pipeline and a gas protection pipeline; and the control system is used for controlling the mass flow controllers and the electromagnetic valves. According to the gas regulation and control system for flame brazing, the fire power of combustion flames can be more precisely controlled, the backfire risk can be effectively avoided, the structure is simple, and the flame regulation and control effect is good.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flame brazing technical field, concretely relates to a gas control system for flame brazing. BACKGROUND

[0002] Brazing is a material connecting method that the base material is heated at a certain temperature lower than the melting point of the base material and higher than the melting point of the filler metal, the liquid filler metal wets, spreads and capillary flows in the gap between the base material and the filler metal to fill the gap, and finally solidifies and crystallizes to realize atomic combination. Because it has the advantages of less influence on the performance of the base material, beautiful joint, guaranteeing the dimensional accuracy of the workpiece, high productivity and the like, it is widely used in various fields such as mechanical manufacturing.

[0003] Flame brazing is a brazing method that uses the flame formed by the combustion of combustible gas for heating. By using the characteristic that the melting point of the metal filler is lower than that of the welding metal, the temperature is heated to a range greater than the filler metal and less than the melting point of the welding metal, the filler metal melts and reacts with the welding metal, and the connection is realized by capillary action. Flame brazing is widely used, mainly for brazing carbon steel, low alloy steel, stainless steel, copper and copper alloy, aluminum and aluminum alloy, and the like. Since brazing only needs to heat the base material to a temperature higher than the melting point of the filler metal, it is necessary to control the flame to be relatively soft and the temperature to be appropriate, which is conducive to ensuring uniform heating. The gas flow control device for flame brazing is particularly important for the quality of flame brazing.

[0004] CN212408669U discloses a gas flow control device for flame brazing, comprising: a gas control pipeline, a first gas solenoid valve and a first mass flow controller are arranged on the pipeline; a combustion-supporting gas control pipeline, a combustion-supporting gas solenoid valve and a second mass flow controller are arranged on the pipeline; a fire-retardant gas control pipeline, a fire-retardant gas solenoid valve is arranged on the pipeline, the outlet of the combustion-supporting gas control pipeline is communicated with the outlet of the fire-retardant gas control pipeline; a control system for controlling each mass flow controller and solenoid valve. The patent technology only designs a single combustion-supporting gas pipeline, which can only selectively pass oxygen or air.

[0005] CN219520768U discloses an automatic brazing flame control system, comprising: a gas pipeline, the pipeline is provided with a ball valve, a manual pressure regulating valve, a first electromagnetic valve, a three-way branch pipeline input point, a mass flow controller, a flux generator, a high-pressure check valve in sequence; a nitrogen pipeline, the pipeline is provided with a ball valve, a manual pressure regulating valve, a three-way branch pipeline output point, a second electromagnetic valve, a two-way gas slip ring, a branch block in sequence; an oxygen pipeline, the pipeline is provided with a ball valve, a manual pressure regulating valve, a third electromagnetic valve, a mass flow controller, a high-pressure check valve in sequence; the manual pressure regulating valve is connected to a pressure gauge with display function, and the ends of the gas pipeline and the oxygen pipeline are connected to a welding gun. Among them, the nitrogen pipeline communicates with the gas pipeline, after closing the brazing system, the nitrogen gas as a cleaning agent and a replacement agent flows into the gas pipeline, and the combustible gas in the gas pipeline is discharged, so as to eliminate the risk of deflagration when starting the brazing system next time. The patent technology is only applicable to manual brazing, can only be used for oxygen combustion support, and needs to be provided with a flame arrester at the front end of the gas pipeline and the oxygen pipeline and a backfire preventer at the tail end.

[0006] The above-mentioned patent technologies only design one combustion-supporting gas pipeline, which can only select oxygen or air, can only adjust the flow of combustion-supporting gas, and cannot switch different combustion-supporting gases or adjust the mixing ratio of mixed combustion-supporting gases. Since different base materials have a large difference in melting point, different brazing filler metals have a large difference in brazing temperature, and the existing gas control system for flame brazing cannot control the flame temperature as required. Therefore, it is necessary to develop a gas control system for flame brazing that can more precisely control the firepower of the burning flame. Practical new type content

[0007] In order to solve the above technical problems, the utility model provides a kind of gas control system for flame brazing, can more precisely control the firepower of the burning flame, can effectively avoid backfire risk and structure is simple, and flame control effect is good.

[0008] Specific technical scheme is as follows:

[0009] A kind of gas control system for flame brazing, comprising:

[0010] Gas pipeline, first gas electromagnetic valve, gas mass flow controller and second gas electromagnetic valve are sequentially provided on it along the gas flow direction;

[0011] Air pipeline, air electromagnetic valve and air mass flow controller are provided on it;

[0012] Oxygen pipeline, oxygen electromagnetic valve and oxygen mass flow controller are provided on it;

[0013] Combustion-supporting gas pipeline, including gas mass flow controller cleaning pipeline, backfire prevention pipeline and gas protection pipeline;

[0014] A control system for controlling the mass flow controllers and solenoid valves.

[0015] In a preferred embodiment, the fire-resistant gas in the control system for controlling the mass flow controllers and solenoid valves.

[0016] In a preferred embodiment, the fire-resistant gas in the control system for controlling the mass flow controllers and solenoid valves.

[0017] In a preferred embodiment, the gas protection pipeline is provided with a third fire-resistant gas solenoid valve.

[0018] Further, in a preferred embodiment, the gas protection pipeline is provided with a fire-resistant gas mass flow controller.

[0019] In a preferred embodiment, the flame brazing gas control system further comprises a mixer.

[0020] Further, in a preferred embodiment, the gas pipeline outlet is connected to the mixer through a first air inlet pipe.

[0021] Further, in a preferred embodiment, the oxygen pipeline outlet and the air pipeline outlet are connected to the mixer through a second air inlet pipe.

[0022] In a preferred embodiment, the control system comprises a control circuit board, and a capacitor element with power storage function is arranged on the control circuit board to provide power to open the second fire-resistant gas solenoid valve when power is off.

[0023] In a preferred embodiment, the control system comprises a PLC module unit connected to the control circuit board to control the opening and closing of the solenoid valves; the interfaces of the mass flow controllers and solenoid valves are arranged on the control circuit board; and a transistor for amplifying the control loop is arranged on the control circuit board.

[0024] In a preferred embodiment, the control circuit board, the PLC module unit, the capacitor element, and the transistor are arranged in a box with two open sides; one side of the box is provided with a fan for introducing fresh air to sweep and cool the control circuit board, the PLC module unit, the capacitor element, and the transistor, and the other side is provided with an exhaust opening.

[0025] In a preferred embodiment, the fan is controlled by the control system and is provided with a filter screen.

[0026] Compared with the prior art, the utility model has the beneficial effects including:

[0027] The gas regulation system for flame brazing adopts double-channel combustion-supporting gas pipelines, namely, an air control pipeline and an oxygen control pipeline, which can be independently controlled, is beneficial to real-time regulation of oxygen content in the combustion-supporting gas, can more precisely control the firepower of the combustion flame, improves operation flexibility, and widens application range.

[0028] In addition, during the flame brazing process, the used combustion gas generally contains various impurities, and the mass flow controller is a precision instrument, and during long-term use, the impurities in the combustion gas can affect the precision of the mass flow controller, etc.

[0029] In addition, the flame brazing gas regulation system in the preferred embodiment of the utility model adopts the flame-resistant gas for anti-backfire, which is introduced into the downstream of the second gas solenoid valve, has a simple structure, can quickly blow out the combustion gas, and effectively avoids the backfire risk.

[0030] In addition, the flame brazing gas regulation system in the preferred embodiment of the utility model adopts the flame-resistant gas for anti-backfire, which is introduced into the downstream of the second gas solenoid valve, has a simple structure, can quickly blow out the combustion gas, and effectively avoids the backfire risk.

[0031] In addition, the flame brazing gas regulation system in the preferred embodiment of the utility model adopts the flame-resistant gas for anti-backfire, which is introduced into the downstream of the second gas solenoid valve, has a simple structure, can quickly blow out the combustion gas, and effectively avoids the backfire risk.

[0032] Other beneficial effects of the utility model are embodied in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1Structure schematic diagram of the gas regulating system for the flame brazing of Example 1.

[0034] In the figure: 1, gas pipeline; 2, air pipeline; 3, oxygen pipeline; 4, flame-retardant gas pipeline; 5, tee; 6, control system; 7, first gas solenoid valve; 8, gas mass flow controller; 9, air solenoid valve; 10, air mass flow controller; 11, oxygen solenoid valve; 12, oxygen mass flow controller; 13, third flame-retardant gas solenoid valve; 14, second gas solenoid valve; 15, control circuit board; 16, PLC module unit; 17, mixer; 18, first air inlet pipe; 19, second air inlet pipe; 20, four-way pipe; 21, second flame-retardant gas solenoid valve; 22, first flame-retardant gas solenoid valve; 23, fan; 24, tee; 25, gas mass flow controller cleaning pipeline; 26, anti-backfire pipeline; 27, gas protection pipeline; 28, tee. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described below in connection with specific embodiments, and the embodiments are given only for better illustration of the present application, rather than for limiting the scope of the present application.

[0036] Example 1

[0037] Referring to Figure 1 A gas regulating system for flame brazing, comprising a gas pipeline 1, an air pipeline 2, an oxygen pipeline 3, a flame-retardant gas pipeline 4, a mixer 17 and a control system 6.

[0038] The first gas solenoid valve 7, the tee 24, the gas mass flow controller 8 and the second gas solenoid valve 14 are sequentially arranged on the gas pipeline 1 along the gas flow direction. The outlet of the gas pipeline 1 is connected to the mixer 17 through the first air inlet pipe 18. The inlet end of the gas pipeline 1 can be connected to natural gas, propane, liquefied gas and other gases.

[0039] The air mass flow controller 10 and the air solenoid valve 9 are sequentially arranged on the air pipeline 2 along the gas flow direction.

[0040] The oxygen mass flow controller 12 and the oxygen solenoid valve 11 are sequentially arranged on the oxygen pipeline 3 along the gas flow direction.

[0041] The flame-retardant gas pipeline 4 comprises a gas mass flow controller cleaning pipeline 25, an anti-backfire pipeline 26 and a gas protection pipeline 27.

[0042] The inlet end of the flame-retardant gas pipeline 4 can be connected to non-combustible gas (flame-retardant gas) such as nitrogen. The outlet end of the flame-retardant gas pipeline 4 is connected to the gas mass flow controller cleaning pipeline 25, the anti-backfire pipeline 26 and the gas protection pipeline 27 through the four-way pipe 20.

[0043] The gas mass flow controller cleaning pipeline 25 is provided with a first fire-resistant gas electromagnetic valve 22 and is connected to the gas pipeline 1 through a tee pipe 24. The gas mass flow controller cleaning pipeline 25 is mainly used for purging the gas mass flow controller 8 after each use of gas, keeping the gas mass flow controller clean, ensuring its precision, and prolonging its service life.

[0044] The anti-backfire pipeline 26 is provided with a second fire-resistant gas electromagnetic valve 21. The anti-backfire pipeline 26 is used for extinguishing fire with fire-resistant gas when the equipment is turned off, ensuring that backfire does not occur. When the equipment is turned off, the second fire-resistant gas electromagnetic valve 21 is energized for a certain period of time, allowing fire-resistant gas to enter the mixer 17 and extinguish the flame.

[0045] The gas protection pipeline 27 is provided with a third fire-resistant gas electromagnetic valve 13. The gas protection pipeline 27 is mainly used for atmosphere protection of the welding workpiece to prevent over-oxidation and ensure welding quality.

[0046] The outlet of the air pipeline 2 and the outlet of the oxygen pipeline 3 are connected to the tee pipe 5, which is connected to the mixer 17 through the second air inlet pipe 19.

[0047] After the gas, air, and oxygen are mixed in the mixer 17, mixed gas is formed, and the outlet of the mixer 17 can be connected to a torch.

[0048] The control system 6 is electrically connected to each mass flow controller and electromagnetic valve for controlling each mass flow controller and electromagnetic valve. The control system 6 includes a control circuit board 15 and a PLC module unit 16 connected to the control circuit board 15. The control circuit board 15 is provided with a capacitor element with power storage function for providing power to open the second fire-resistant gas electromagnetic valve 21 when power is off. After the external input voltage is off, the power stored in the capacitor element can energize the second fire-resistant gas electromagnetic valve 21 for 1-2 seconds, allowing fire-resistant gas to enter the mixer 17, ensuring that backfire does not occur when the equipment is extinguished during abnormal power failure.

[0049] The PLC module unit 16 is used to control the opening and closing of each electromagnetic valve. The interfaces of each mass flow controller and electromagnetic valve are provided on the control circuit board 15. The control circuit board 15 is also provided with a transistor for amplifying the control loop. The control circuit board 15 serves as an intermediate bridge for connecting the PLC module unit 16 and external control elements, greatly improving the efficiency of wiring. The transistor is used to improve the output load capacity of the PLC module unit 16, allowing the PLC module unit 16 to be directly connected to the electromagnetic valve for controlling its on-off, which uses non-contact on-off switching and can respond quickly.

[0050] The gas regulating system for flame brazing of the embodiment adopts double-channel combustion-supporting gas pipelines, namely, an air control pipeline and an oxygen control pipeline, which can be independently controlled, is beneficial to real-time adjustment of oxygen content in combustion-supporting gas, can more precisely control the firepower of the combustion flame, improves the operation flexibility, and widens the application range.

[0051] Embodiment 2

[0052] On the basis of the gas regulating system for flame brazing of embodiment 1, the control circuit board 15, the PLC module unit 16, the capacitor element and the transistor of the embodiment are all arranged in a box with two open sides. One side of the box is provided with a fan 23 connected with the circuit board unit 15 and provided with a filter screen, which is used to introduce fresh air to sweep and cool the control circuit board 15, the PLC module unit 16, the capacitor element and the transistor and exhaust through the other side. Such a design not only ensures that the electronic components are not damaged by overheating during operation, but also avoids the problem of dust accumulation of the electronic components.

[0053] Embodiment 3

[0054] On the basis of the gas regulating system for flame brazing of embodiment 1, the gas regulating system for flame brazing of the embodiment increases a fire-retardant gas mass flow controller on the gas protection pipeline 27. Specifically, the fire-retardant gas mass flow controller is arranged between the four-way pipe 20 and the third fire-retardant gas electromagnetic valve 13.

[0055] The gas regulating system for flame brazing of the embodiment ensures the constant flow of fire-retardant gas from the gas protection pipeline by adding the fire-retardant gas mass flow controller, thereby avoiding the influence of fire-retardant gas flow fluctuation on the temperature of the welding workpiece and ensuring the stability of welding.

[0056] In addition, it should be understood that, after reading the above description of the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the claims attached to the present application.

Claims

1. A gas regulation system for flame brazing, characterized in that The application relates to a gas control system for flame brazing. The gas pipeline is sequentially provided with a first gas electromagnetic valve, a gas mass flow controller and a second gas electromagnetic valve along the gas flow direction; The air pipeline is provided with an air electromagnetic valve and an air mass flow controller; The oxygen pipeline is provided with an oxygen electromagnetic valve and an oxygen mass flow controller; The fire-resistant gas pipeline comprises a gas mass flow controller cleaning pipeline, an anti-backfire pipeline and a gas protection pipeline; The control system is used for controlling the mass flow controllers and the electromagnetic valves.

2. A gas control system for flame brazing according to claim 1, characterized in that The fire-resistant gas in the gas mass flow controller cleaning pipeline is introduced into the gas mass flow controller through a first fire-resistant gas electromagnetic valve.

3. A gas control system for flame brazing as defined in claim 1, wherein The fire-resistant gas in the anti-backfire pipeline is introduced into the gas pipeline downstream of the second gas electromagnetic valve through a second fire-resistant gas electromagnetic valve.

4. A gas control system for flame brazing as defined in claim 1, wherein The gas protection pipeline is provided with a third fire-resistant gas electromagnetic valve.

5. A gas control system for flame brazing as claimed in claim 4, wherein The gas protection pipeline is provided with a fire-resistant gas mass flow controller.

6. A gas control system for flame brazing as defined in claim 1, wherein The gas control system for flame brazing further comprises a mixer, the outlet of the gas pipeline is connected with the mixer through a first air inlet pipe, and the outlet of the oxygen pipeline and the outlet of the air pipeline are connected with the mixer through a second air inlet pipe.

7. A gas control system for flame brazing according to any one of claims 1 to 6, characterised in that The control system comprises a control circuit board, the control circuit board is provided with a capacitor element with an electric quantity storage function, and the capacitor element is used for providing electric quantity to open the second fire-resistant gas electromagnetic valve when power is off.

8. A gas control system for flame brazing according to claim 7, characterized in that The control system comprises a PLC module unit connected with the control circuit board, and the PLC module unit is used for controlling the opening and closing of the electromagnetic valves; the interfaces of the mass flow controllers and the electromagnetic valves are arranged on the control circuit board; and the control circuit board is provided with a transistor used for amplifying a control loop.

9. A gas control system for flame brazing according to claim 8, characterized in that The control circuit board, the PLC module unit, the capacitor element and the transistor are arranged in a box with two open sides; one side of the box is provided with a fan used for introducing fresh air to sweep and cool the control circuit board, the PLC module unit, the capacitor element and the transistor and discharging air through the other side.

10. A gas control system for flame brazing according to claim 9, characterized in that The fan is controlled to open and close by the control system, and the fan is provided with a filter screen.

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