Protective gas supply system for brazing furnace

Abstract

The utility model discloses a protective gas supply system of a brazing furnace. The protective gas supply system comprises a plurality of protective gas grids, one end of the gas conveying pipeline is in butt joint with the connector of the protection gas tank in parallel, the other end of the gas conveying pipeline is communicated with a connector on gas equipment of the brazing furnace, and a protection gas access valve, a first barometer, a pressure regulating valve, a second barometer and a main output valve are sequentially arranged in the gas supply direction of the gas conveying pipeline. Compared with a common gas supply system, a plurality of shielding gas supply systems are designed to supply gas to the brazing furnace independently, one shielding gas supply system is used, other shielding gas supply systems are standby, when the pressure of nitrogen in use is too low, the system gives an alarm, staff can switch to standby nitrogen for use in a short time, the staff have sufficient time to replace and maintain the nitrogen grid, and the working efficiency is improved. The equipment can realize continuous production without shutdown, and potential safety hazards are avoided. The design of the preheating equipment and the protective sleeve can heat and preheat the low-temperature nitrogen output by the nitrogen grid, so that the influence of the protective gas temperature on the operation of the brazing furnace is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas supply systems, in particular to a shielding gas supply system for a brazing furnace. Background Art

[0002] Currently, the shielding gas supply for brazing furnaces generally uses a set of nitrogen cells. During startup or shutdown, if there is insufficient nitrogen and personnel do not have enough time to replace the nitrogen cells, there is a risk of the equipment exploding. The replacement and maintenance of nitrogen cells also need to be carried out during the shutdown of the device, affecting the actual production efficiency. Personnel need to constantly monitor the gas consumption of the equipment, and the equipment cannot operate without personnel, resulting in increased labor costs. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a shielding gas supply system for a brazing furnace to solve the problems that the shielding gas supply of common brazing furnaces generally uses a set of nitrogen cells. During startup or shutdown, if there is insufficient nitrogen and personnel do not have enough time to replace the nitrogen cells, there is a risk of the equipment exploding. The replacement and maintenance of nitrogen cells also need to be carried out during the shutdown of the device, affecting the actual production efficiency. In addition, personnel need to constantly monitor the gas consumption of the equipment, and the equipment cannot operate without personnel, resulting in increased labor costs.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: A shielding gas supply system for a brazing furnace, comprising:

[0005] A plurality of shielding gas cells, with a plurality of shielding gas cylinders assembled inside;

[0006] A gas pipeline, one end of which is connected in parallel to the joints of the shielding gas cylinders, and the other end is connected to the joints on the gas-using equipment of the brazing furnace. Along the gas supply direction of the gas pipeline, a shielding gas access valve, a first pressure gauge, a pressure regulating valve, a second pressure gauge, and a total output valve corresponding to the shielding gas cells are sequentially arranged.

[0007] As a further description of the above technical scheme:

[0008] The shielding gas cells are nitrogen cells, and the shielding gas cylinders are nitrogen cylinders.

[0009] As a further description of the above technical scheme:

[0010] The shielding gas access valve, the pressure regulating valve, and the total output valve are electromagnetic valves.

[0011] As a further description of the above technical scheme:

[0012] A high-pressure stop valve is arranged between the shielding gas access valve and the pressure regulating valve.

[0013] As a further description of the above technical scheme:

[0014] A preheating device is arranged between the pressure regulating valve and the total output valve, and a heat preservation sleeve is sleeved outside the gas pipeline at the rear end of the pressure regulating valve.

[0015] As a further description of the above technical solution:

[0016] An air vent branch is arranged between the pressure regulating valve and the total output valve, and a vent valve and a safety valve are arranged on the air vent branch.

[0017] To sum up, due to the adoption of the above technical solution, the present utility model has the following

[0018] beneficial effects compared with the prior art:

[0019] The present gas supply system is designed with multiple groups of protective gas supply systems to supply gas to the brazing furnace separately. One group is in use and the others are in standby. When the nitrogen pressure in use is too low, the system alarms, and the staff can switch to the standby nitrogen in a short time, and the staff has sufficient time to replace the gas cylinder of the used nitrogen cartridge. The equipment can continuously produce without stopping, and potential safety hazards are avoided. The design of the preheating device and the protective sleeve can heat up and preheat the low-temperature nitrogen output by the nitrogen cartridge to reduce the influence of the protective gas temperature on the operation of the brazing furnace and improve the production efficiency. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of a protective gas supply system for a brazing furnace.

[0022] Legend Explanation:

[0023] 1. Protective gas cartridge; 2. Protective gas tank; 3. Protective gas access valve; 4. First barometer; 5. High-pressure stop valve; 6. Pressure regulating valve; 7. Second barometer; 8. Preheating device; 9. Total output valve; 10. Gas-using equipment; 11. Vent valve; 12. Safety valve. Detailed Embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0026] Please refer to Figure 1 , the present utility model provides a technical solution: a brazing furnace protective gas supply system, including:

[0027] Several protective gas compartments 1, with several protective gas cylinders 2 assembled inside;

[0028] A gas pipeline, one end of which is connected in parallel to the joint of the protective gas cylinder 2, and the other end is connected to the joint on the gas-using equipment 10 of the brazing furnace. Along the gas supply direction of the gas pipeline, a protective gas access valve 3, a first pressure gauge 4, a pressure regulating valve 6, a second pressure gauge 7, and a total output valve 9 corresponding to the protective gas compartment 1 are sequentially arranged. The pressure range of the first pressure gauge 4 is 1 - 13 MPa, the pressure range of the second pressure gauge 7 is 0.1 - 0.2 MPa, and the pressure of the protective gas input by the gas-using equipment is 0.2 MPa.

[0029] The protective gas compartment 1 is a nitrogen compartment, and the protective gas cylinder 2 is a nitrogen cylinder, which improves the protection of the operation of the brazing furnace.

[0030] The protective gas access valve 3, the pressure regulating valve 6, and the total output valve 9 are solenoid valves, and the above valves are uniformly controlled by a controller to achieve precise and automatic supply of protective gas.

[0031] A high-pressure cut-off valve 5 is arranged between the protective gas access valve 3 and the pressure regulating valve 6 to respond to the high-pressure environment in the gas supply system and improve the stable and safe operation of the gas supply system.

[0032] A preheating device 8 is arranged between the pressure regulating valve 6 and the main output valve 9. A heat preservation sleeve is sleeved outside the gas pipeline at the rear end of the pressure regulating valve 6. Based on the fact that nitrogen gas cylinders mostly use liquid nitrogen for low-temperature storage, resulting in a relatively low temperature of the output nitrogen gas, the output nitrogen gas is heated to a set range by the preheating device 8 and insulated by the heat preservation sleeve, so that the temperature of the nitrogen gas input into the brazing furnace gas-using device 10 will not affect the use of the brazing furnace.

[0033] An air vent branch is arranged between the pressure regulating valve 6 and the main output valve 9. A vent valve 11 and a safety valve 12 are arranged on the air vent branch, which is convenient for exhausting the gas in the pipeline, ensuring the stability of the nitrogen gas purity input into the device, or facilitating pipeline maintenance and replacement. Among them, the pressure threshold of the safety valve 12 is 0.4 MPa.

[0034] The working principle of a brazing furnace protective gas supply system in this embodiment includes: when in use for gas supply, the two groups of nitrogen gas cells arranged in this embodiment are connected to the system; the left nitrogen gas cell is used as the protective gas, and the corresponding protective gas access valve 3, pressure regulating valve 6, and main output valve 9 are opened to protect the brazing furnace. The preheating device 8 heats the output nitrogen gas to a set temperature to avoid the influence of injecting low-temperature gas on the operation of the brazing furnace; after the left nitrogen gas cell is used up, the device alarms and the staff switches the system; the corresponding protective gas access valve 3 is opened and closed, and the system switches to the right nitrogen gas cell for protection; the used-up left nitrogen gas cell is replaced; after the right nitrogen gas cell is used up, the device alarms and the staff switches the system; the system switches to the left nitrogen gas cell for protection; the used-up right nitrogen gas cell is replaced, and so on. The personnel have sufficient time to replace the gas cylinders of the used-up nitrogen gas cells, and the device can continuously produce without stopping, avoiding potential safety hazards.

[0035] In summary, due to the adoption of the above technical solutions, a brazing furnace protective gas supply system in this embodiment has the following beneficial effects compared with the prior art:

[0036] This gas supply system is designed with multiple groups of protective gas supply systems to supply gas to the brazing furnace separately. One group is in use and the others are in standby. When the nitrogen gas pressure during use is too low, the system alarms, and the staff can switch to the standby nitrogen gas in a short time. Moreover, the personnel have sufficient time to replace the gas cylinders of the used-up nitrogen gas cells, and the device can continuously produce without stopping, and potential safety hazards are avoided. The design of the preheating device and the protective sleeve can heat and preheat the low-temperature nitrogen gas output from the nitrogen gas cell to reduce the influence of the protective gas temperature on the operation of the brazing furnace and improve production efficiency.

[0037] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A brazing furnace protective gas supply system, characterized in that: include: A plurality of protective gas grids, each of which is equipped with a plurality of protective gas tanks; A gas transmission pipeline, one end of which is connected in parallel to the joint of the protective gas tank, and the other end is connected to the joint on the gas equipment for the brazing furnace. A protective gas access valve, a first barometer, a pressure regulating valve, a second barometer and a total output valve corresponding to the protective gas grid are arranged in sequence along the gas delivery direction of the gas transmission pipeline.

2. A brazing furnace protective gas supply system according to claim 1, characterized in that: The protective gas grid is a nitrogen grid, and the protective gas tank is a nitrogen tank.

3. A brazing furnace protective gas supply system according to claim 1, characterized in that: The protective gas inlet valve, the pressure regulating valve and the main output valve are solenoid valves.

4. A brazing furnace protective gas supply system according to claim 1, characterized in that: A high-pressure stop valve is arranged between the protective gas inlet valve and the pressure regulating valve.

5. A brazing furnace protective gas supply system according to claim 1, characterized in that: A preheating device is arranged between the pressure regulating valve and the main output valve, and a heat preservation sleeve is arranged on the outer side of the gas transmission pipeline at the rear end of the pressure regulating valve.

6. A brazing furnace protective gas supply system according to claim 1, characterized in that: A ventilation branch is arranged between the pressure regulating valve and the main output valve, and a vent valve and a safety valve are arranged on the ventilation branch.

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