CN207971548U - The automatic fireproof tempering device of gas welding or gas cutting - Google Patents

Abstract

The utility model provides an automatic backfire prevention device for gas welding or gas cutting, which comprises a casing, one end of the casing is provided with an interface, and a through hole communicating with the interface is provided on the casing along the axial direction, and a piston is arranged in the through hole , one end of the piston is connected with the spring fixed in the through hole, and a plurality of air intake holes connected with the interface are provided along the circumferential direction at one end of the housing, and the plurality of air intake holes are also connected with the through hole, when the spring naturally elongates At the same time, the piston closes one end of the multiple air intake holes, the spring is compressed, the piston moves, the multiple air intake holes communicate with the through hole, and the other end of the housing is provided with multiple thermocouples along the circumference, and the multiple thermocouples are Extending to the outside of the housing, multiple thermocouples are respectively connected to multiple sets of coils to form a closed loop, and the end of the piston away from the interface is located in the area surrounded by multiple sets of coils. The utility model can automatically prevent tempering and avoid explosion accidents; after flameout, it can also avoid gas leakage caused by forgetting to close the oxygen or combustible gas valve.

Description

Automatic backfire prevention device for gas welding or gas cutting

technical field

The utility model relates to the technical field of a protection device for a gas welding torch or a gas cutting torch, and more particularly relates to an automatic anti-backfire device for a gas welding torch or a gas cutting torch.

Background technique

Gas welding or gas cutting technology has been widely used in modern industry and construction industry. In the field of steel structure, gas welding or gas cutting runs through the whole project from beginning to end. However, in the process of gas welding or gas cutting, the phenomenon of "tempering" and "flame out" occurs from time to time. Gas welding tempering is a phenomenon in which oxygen or combustible gas (such as acetylene gas) burns in the mixing chamber of welding and cutting torches during welding and cutting operations, and diffuses back to the hose that transports acetylene gas. If the tempering is serious, the welding and cutting torch will be burnt, and even an explosion may occur. The reason for the flashback is that the muzzle is blocked or the mixed gas flow velocity is lower than the flame burning velocity, or the proportion of oxygen or air in the mixed gas is too large. Flame extinguishing means that during the process of gas welding or gas cutting, the nozzle fire of the welding torch is extinguished, but the combustible gas is not closed, and the mixed gas spreads to the surroundings, which will cause human poisoning or the mixed gas will explode in case of fire. Therefore, "tempering" or "flame extinguishing" is a great safety hazard in gas welding or gas cutting operations, and corresponding devices need to be developed to solve this problem.

Utility model content

In view of the above problems, the purpose of this utility model is to provide an automatic anti-backfire device for gas welding or gas cutting to solve the problem in the prior art that the gas pressure welding torch is prone to backfire or flameout during gas welding or gas cutting operations.

In order to achieve the above object, the utility model is achieved through the following technical solutions:

An automatic anti-backfire device for gas welding or gas cutting, comprising a housing, one end of the housing is provided with an interface matched with the air inlet of the welding torch, and an opening communicating with the interface is arranged on the housing along the axial direction. A through hole, a piston with a diameter matching the inner diameter of the through hole is arranged in the through hole, and one end of the piston close to the interface is connected with a spring fixed in the through hole, and a piston is arranged at one end of the housing. There are a plurality of air intake holes communicated with the interface, the plurality of air intake holes are circumferentially arranged on the outer periphery of the through hole and one end of the plurality of air intake holes is connected to the through hole, the The other end of the casing is provided with multiple thermocouples and multiple sets of coils along the circumference, one end of the multiple thermocouples all extends to the outside of the shell, and the other ends of the multiple thermocouples correspond to the multiple sets of coils respectively connected to form a closed loop,

When the spring is in a state of natural elongation, the piston closes one end connecting the plurality of air inlet holes with the through hole so that the plurality of air inlet holes do not communicate with the through hole,

When the automatic backfire prevention device is connected with the welding torch for gas welding or gas cutting, the spring is compressed, and the piston moves toward the interface so that one end of the plurality of air inlet holes connected to the through hole is opened so that The plurality of air intake holes communicate with the through hole.

Preferably, a first connecting rod is provided between an end of the piston close to the interface and the spring.

Preferably, a push plate is further arranged between the first connecting rod and the spring, one end of the push plate is fixedly connected to the first connecting rod, and the other end of the push plate is fixed to the spring. connected, the diameter of the other end of the push plate corresponds to the inner diameter of the through hole.

Preferably, a second connecting rod is provided at the end of the piston away from the interface, the second connecting rod is located in the area surrounded by multiple groups of the coils, and the second connecting rod is a magnet.

Preferably, the second connecting rod is located at the center of the area surrounded by multiple sets of coils.

Preferably, the inner peripheral surface of the interface is provided with internal threads matching the external threads on the air inlet of the welding torch.

Preferably, a sealing ring is provided at one end of the interface close to the through hole.

Preferably, when the spring is in natural extension, the second connecting rod protrudes from the through hole to the outside of the housing or the second connecting rod is flush with the other end of the housing.

Compared with the prior art, the utility model has at least the following beneficial effects: the utility model generates a magnetic field in the coil through the thermoelectric effect of the thermocouple, generates a thrust to the piston under the action of the magnetic field, and then automatically opens the oxygen and combustible gas of the welding torch. The air inlet hole is used for welding or cutting; and when tempering or flameout occurs, the thermoelectric effect of the thermocouple disappears, so the magnetic field disappears, and the piston returns to its original position under the action of the spring restoring force, and then the oxygen and combustible gas of the welding torch are fed into the air. The hole is closed to prevent backfire and prevent the flame from blowing back and burning the rubber hose, and also avoid the occurrence of explosion accidents; in addition, after the flame is turned off, it also avoids gas leakage caused by workers forgetting to close the valve of the oxygen cylinder or the valve of the combustible gas. Leakage will not only cause air pollution but also explode in case of fire.

Description of drawings

By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the utility model, other objectives and results of the utility model will be more clear and easy to understand. In the attached picture:

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the A-A direction sectional view of Fig. 1;

Fig. 3 is the B-B direction sectional view of Fig. 1;

Fig. 4 is a schematic structural view of the embodiment of the utility model during gas welding or gas cutting operation.

The same reference numerals indicate similar or corresponding features or functions throughout the drawings.

Detailed ways

Specific embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Fig. 1, Fig. 2 and Fig. 3 together, the utility model provides an automatic anti-temper device for gas welding or gas cutting, comprising a shell 1, in this embodiment, the shell 1 is a cylinder, the shell The body 1 can also be in other shapes, such as a frustum of a cone. One end of the shell 1 is provided with an interface 10 matched with the air inlet of the welding torch. The interface 10 is a groove provided at one end of the housing 1 and recessed into the housing 1 . Of course, the interface 10 can also be an outwardly extending cylinder provided at one end of the housing 1 . In order to facilitate the connection between the interface 10 and the air inlet of the welding torch, a section of internal thread matching the outer thread of the air inlet of the welding torch is provided on the inner peripheral surface of the interface 10 . In addition, in order to prevent air leakage, a rubber sealing ring is also provided on the inner end surface of the interface 10 .

A through hole 11 is arranged in the center of the housing 1 in the axial direction, and the through hole 11 communicates with the interface 10 . A piston 2 whose diameter matches the inner diameter of the through hole 11 is disposed in the through hole 11 . One end of the piston 2 close to the interface 10 is provided with a first connecting rod 3 , and the first connecting rod 3 is connected with a spring 4 fixed in the through hole 11 near the end of the interface 10 . In order to make the connection between the first connecting rod 3 and the spring 4 more firm, a push plate 5 is arranged between the first connecting rod 3 and the spring 4 . In this embodiment, the push plate 5 is in the shape of a truncated cone, that is, the diameter of the push plate 5 gradually increases as it moves away from the first connecting rod 3 . More preferably, the diameter of the end of the push plate 5 connected to the spring 4 corresponds to the inner diameter of the through hole 11 . One end of the housing 1 is also provided with a plurality of air intake holes 12, and the plurality of air intake holes 12 are arranged on the outer periphery of the through hole along the circumferential direction. The other end of air hole 12 is all connected with through hole 11, and when spring 4 was in the state of natural elongation, piston 3 closed one end that a plurality of air inlet holes 12 were connected with through hole 11, and at this moment, a plurality of air inlet holes 12 is not communicated with the through hole 11; the spring 4 is compressed, the piston 3 moves in the direction of the interface 10 in the through hole 11, and one end connected with the through hole 11 of a plurality of air inlet holes 12 is exposed, and at this moment, a plurality of air inlet holes 12 Both communicate with the through hole 11.

A plurality of thermocouples 6 are arranged on the other end of the casing 1 along the circumference, and the plurality of thermocouples 6 are arranged on the outer periphery of the through hole 11 , and the plurality of thermocouples 6 extend out of the casing 1 . Each thermocouple 6 is connected to a group of coils 7 through a converter to form a closed loop. Each group of coils 7 is arranged in the casing 1 corresponding to the thermocouple 6 connected thereto. And the end of the piston 3 close to the thermocouple 6 is provided with a second connecting rod 8, the second connecting rod 8 is a magnet, and in this embodiment, the second connecting rod 8 is made of steel material. In order to make the magnetic force generated by the coil 7 act on the second connecting rod 8 better, one end of the second connecting rod 8 extends out of the housing 1 or one end of the second connecting rod 8 is flush with the other end of the housing 1 , and the second connecting rod 8 is located at the center of the area surrounded by multiple sets of coils 7 .

When applying the automatic anti-tempering device of gas welding or gas cutting of the present embodiment, see Fig. 4, the oxygen inlet of welding torch is fixedly connected with the interface 10 of this device by thread, the combustible gas inlet of welding torch is connected with another An interface 10 of the device is fixedly connected by screwing. Then the thermocouples 6 at the other ends of the shells 1 of the two devices are all connected to the gun head part of the welding torch. Ignite at the tip of the gun. After ignition, the thermoelectric effect produced by each thermocouple 6 causes current to be generated in the coil 7 connected to it, and the current generates a magnetic field in multiple groups of coils 7 . The magnetic field generates a thrust on the second connecting rod 8 made of steel, and then pushes the second connecting rod 8, the piston 2, the first connecting rod 3 and the push plate 5 to move toward the interface 10 to compress the spring 4. When the spring 4 is compressed to a certain extent , the piston 2 moves away from the joints between a plurality of air intake holes 12 and the through hole 11. At this time, the plurality of air intake holes 12 are all communicated with the through hole 11, and the oxygen and combustible gas on the welding torch pass through two ports on the device respectively. The gas inlet hole 12 enters into the mixing chamber of the welding torch. In gas welding or gas cutting operations, the opening degree of the oxygen valve can be adjusted according to the requirements of the flame to obtain the required size of the flame for gas welding or gas cutting. After welding, first close the combustible gas valve, and then close the oxygen valve. The thermocouple 6 on the device connected to the oxygen inlet and the combustible gas inlet on the welding torch is cooled, and the thermoelectric effect disappears, then the current in the multi-group coil 7 disappears, and the magnetic field generated by the multi-group coil 7 also disappears. Thereupon the thrust acting on the second connecting rod 8 disappears, and under the action of the restoring force of the spring 4, the push plate 5 connected with the spring 4 pushes the first connecting rod 3 and the piston 2 connected with the first connecting rod 3 in the communication. Move in the direction of the thermocouple 6 in the hole 11, and when the spring 4 recovers naturally, the piston 2 moves to the connection between the through hole 11 and the multiple air intake holes 12 so as to connect the multiple air intake holes 12 with the through holes 11 Closed, so that the oxygen inlet pipe and combustible gas inlet pipe of the welding torch are closed, preventing backfire. Safety.

The automatic backfire prevention device for gas welding or gas cutting according to the present utility model is described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that for the automatic backfire prevention device for gas welding or gas cutting proposed by the utility model, various improvements can be made without departing from the content of the utility model. Therefore, the protection scope of the present utility model should be determined by the contents of the appended claims.

Claims (8)

1. the automatic fireproof tempering device of a kind of gas welding or gas cutting, which is characterized in that including shell, one end of the shell is provided with The interface of connection is matched with welding gun air inlet, and the through-hole of one and the orifice are provided in the axial direction on the shell, it is described The piston that a diameter matches with through-hole internal diameter is provided in through-hole, the piston is close to one end of the interface and is fixed on institute The spring connection in through-hole is stated, multiple air admission holes with the orifice are additionally provided in one end of the shell, it is described more A air admission hole is circumferentially disposed at the periphery of the through-hole and one end of the multiple air admission hole and is connect with the through-hole, described The other end of shell is circumferentially arranged a multiple thermocouples and multigroup coil, and one end of the multiple thermocouple all extends to described Outside shell, the other end of the multiple thermocouple is correspondingly connected with to form closed circuit with multigroup coil respectively,

When the spring is in nature elongation state, one end that the multiple air admission hole is connect by the piston with the through-hole Closing makes the multiple air admission hole be not connected to the through-hole,

When the automatic fireproof tempering device, which is connect with welding gun, carries out gas welding or gas cutting, the spring is compressed, the piston is to institute Interface direction is stated to move so that one end that the multiple air admission hole is connect with the through-hole is opened to the multiple air admission hole It is connected to the through-hole.

2. the automatic fireproof tempering device of gas welding as described in claim 1 or gas cutting, which is characterized in that in the piston close to institute It states and is provided with first connecting rod between one end of interface and the spring.

3. the automatic fireproof tempering device of gas welding as claimed in claim 2 or gas cutting, which is characterized in that the first connecting rod and institute State and be additionally provided with a push-plate between spring, one end of the push-plate is fixedly connected with the first connecting rod, the push-plate it is another End is fixedly connected with the spring, and the other end diameter of the push-plate is corresponding to the internal diameter of the through-hole.

4. the automatic fireproof tempering device of gas welding as described in claim 1 or gas cutting, which is characterized in that in the piston far from institute The one end for stating interface is provided with second connecting rod, and the second connecting rod is located in the region that multigroup coil encloses, and described second Connecting rod is magnet.

5. the automatic fireproof tempering device of gas welding as claimed in claim 4 or gas cutting, which is characterized in that the second connecting rod is located at On the center in the region that multigroup coil encloses.

6. the automatic fireproof tempering device of gas welding as described in claim 1 or gas cutting, which is characterized in that the inner periphery of the interface The internal thread to match with the external screw thread on welding gun air inlet is provided on face.

7. the automatic fireproof tempering device of gas welding as described in claim 1 or gas cutting, which is characterized in that close to institute in the interface The one end for stating through-hole is provided with a sealing ring.

8. the automatic fireproof tempering device of gas welding as claimed in claim 4 or gas cutting, which is characterized in that when the spring is in certainly So when elongation, the second connecting rod extend out to from the through-hole outside shell or the second connecting rod and the shell it is another Hold level with both hands neat.