CN115451145A - Fluid valve and flame gun - Google Patents

Abstract

The invention relates to a fluid valve and a spray gun, comprising: a valve body, the valve body has a valve core hole intersecting with the internal flow channel, the inner end of the valve core hole ends in the valve body and is provided with an internal thread section; A mandrel, the spool shaft is provided with an external thread section and a sealing section, the external thread section is threadedly connected with the internal thread section, and the on-off state of the internal flow channel is controlled by the movement of the external thread section on the internal thread section. The fluid valve provided by the present invention is simple and reasonable in structure, small in size, convenient for installation, use and maintenance, and can be used on a fire spray gun to control the fluid flow conveniently and accurately, so as to improve the working efficiency of the fire spray gun. Liquid mixing and atomization to achieve liquid fuel injection combustion, liquid fuel atomization effect is good, to achieve cutting processing, so it is suitable for liquid fuel for combustion cutting processing, solves the defect that the existing flame gun can only use flammable gas, fills This application is vacant and expands the application of energy, which has better economic and social benefits.

Description

Fluid valve and spray gun

technical field

The invention relates to the technical field of cutting production, in particular to a spray gun for cutting.

Background technique

In current industrial production, the flame-throwing gun is a tool commonly used for burning and cutting, and the workpiece is partially melted by flame-throwing and burning to achieve cutting. Yet existing torch all is to utilize combustible gas as fuel, as acetylene, butane etc., and does not have the torch that is suitable for liquid fuel, and, for the size of the flame that torch provides and the requirement of fire mode is different, It is necessary to adjust the flame sprayed by the torch according to the cutting needs. At this time, switch control is adopted. The traditional switch is mainly a valve structure, such as a ball valve, but the structure is relatively complicated, fragile and difficult to maintain, which affects the service life. Therefore, the applicant proposes a fluid valve and a torch according to the current situation. The fluid valve is suitable for use on a torch, and the torch is suitable for cutting with liquid fuel, which is the application of this case.

Contents of the invention

The object of the present invention is to provide a fluid valve and a torch, which have a simple and reasonable structure, are suitable for burning and cutting liquid fuels, and fill the gap in this application.

To achieve the above object, the present invention adopts the following technical solutions:

A fluid valve having:

A valve body, the valve body has an input port, an output port, an internal flow channel connecting the input port and the output port, and a spool hole cross-communicating with the internal flow channel, the inner end of the spool hole ends in the valve body and is set There is an internally threaded section, and the outer end of the spool hole extends from the valve body; the internally threaded section traverses said internal flow passage;

The spool shaft, the spool shaft is provided with an external thread section and a sealing section, and the external thread section and the sealing section are inserted into the valve body along the spool hole, and the outer end of the spool shaft is connected to the operating part; the external thread The segment is threadedly connected with the internal thread segment, and the on-off state of the internal flow channel is controlled by the movement of the external thread segment on the internal thread segment.

In the above solution, the spool hole is vertically cross-communicated with the internal flow channel, and the diameter of the intersection of the internal flow channel and the spool hole is smaller than the pore diameter of the internal thread section.

A spray gun, characterized in that the spray gun includes the above-mentioned fluid valve.

The above scheme is further that the torch is a tool for cutting and processing using liquid fuel combustion, and has:

The support seat has a first oxygen inlet, a liquid fuel inlet, an oxygen outlet, a gas-liquid mixing outlet, a first oxygen flow channel, a second oxygen flow channel and a liquid flow channel, the first oxygen flow channel and the second oxygen flow The channel is two flow channels drawn from the first oxygen inlet, the first oxygen inlet is connected to the oxygen outlet through the first oxygen flow channel, and the first oxygen inlet is connected to the gas-liquid mixing outlet through the second oxygen flow channel; the liquid The fuel inlet is connected to the gas-liquid mixing outlet through the liquid flow channel, and the liquid fuel is mixed with oxygen in the gas-liquid mixing outlet to form a gas-liquid mixture;

The control unit is connected to the support base. The control unit includes a first pressure regulating assembly, a second pressure regulating assembly and a third pressure regulating assembly. The first pressure regulating assembly controls the working state of the first oxygen flow channel. The second pressure regulating component controls the working state of the second oxygen flow channel; the third pressure regulating component controls the working state of the liquid flow channel;

Front-end assembly, the front-end assembly has a second oxygen inlet, a gas-liquid mixing inlet and a live interface, the second oxygen inlet is connected to the oxygen outlet through the gas outlet pipe; the gas-liquid mixing inlet is connected to the gas-liquid mixing outlet through the gas-liquid pipe, and A fluid valve and a Venturi tube are embedded between the gas-liquid pipe and the gas-liquid mixing outlet, and the Venturi tube is connected to the gas-liquid mixing outlet to guide the movement of the gas-liquid mixture based on the Venturi principle; the fluid valve controls the gas-liquid mixture in the gas-liquid pipe traffic;

The nozzle, which is assembled on the live interface of the front end assembly, is used to atomize and spray the oxygen and gas-liquid mixture introduced by the front end assembly to achieve combustion and cutting work.

The above scheme further includes that the nozzle includes an outer tube and an inner core, the inner core is positioned in the outer tube and arranged coaxially with the outer tube; the air outlet end of the inner core is provided with a tapered surface along the air outlet direction, and the tapered surface There are tapered grooves, and the corresponding inner peripheral surface of the outer tube is assembled with the tapered surface of the inner core and enclosed with the tapered grooves to form a spray hole; the inner core is also provided with air blowing holes, which are distributed in The inner middle part of the inner core is axially penetrated, and the tapered grooves are distributed on the outer periphery of the air blowing hole; the oxygen introduced by the front end assembly is blown out in a straight line toward the first direction from the air blowing hole, and the gas-liquid mixture introduced by the front end assembly is blown out from the cone Atomized and sprayed from the spray hole formed by the tapered groove, and the spray direction of the tapered groove intersects with the blowing direction of the air blowing hole to form an intersection, which is located directly in front of the air blowing hole.

The above scheme further includes that the nozzle is locked on the live interface of the front end assembly through a nut, and the inner core is also provided with a ring platform, which is close to the inner end of the inner core and is stuck on the inner end of the outer tube. The inner end of the pipe is provided with an everted ring, the nut is threadedly connected with the front end assembly and supported to support the everted ring, and the ring platform is embedded in the joint through a bevel fit; the ring platform is provided with The distribution holes are distributed around the blowing holes of the inner core, and the distribution holes communicate with the gas-liquid mixing inlet and the tapered groove.

The above scheme is further characterized in that the inside of the outer tube is also provided with a pressure equalization chamber, which buffers the gas-liquid mixture introduced by the front end assembly before being sprayed out; the gas outlet end of the inner core is relatively The end is retracted by a certain distance.

The above scheme is further characterized in that the support seat is also provided with a connecting hole coaxially connected with the gas-liquid mixing outlet, the connecting hole extends from the opposite direction of the gas-liquid mixing outlet, and the connecting hole connects the second oxygen flow channel, the liquid flow channel, and the gas-liquid mixing outlet. The airway and the gas-liquid mixing outlet are connected together, and an air guide tube is embedded in the connecting hole. One end of the air guide tube is connected to the second oxygen flow channel, and the other end of the air guide tube points to the gas-liquid mixing outlet and is connected to the outlet of the gas-liquid mixing outlet. The direction is coaxial, and the liquid flow channel guides the liquid fuel from the outer periphery of the air guide tube into the gas-liquid mixing outlet; the third pressure regulating component is assembled corresponding to the connecting hole and cooperates with the air guide tube to control the working state of the second oxygen flow channel.

The above solution further includes that the first oxygen inlet is extended to connect to the first hose nozzle through the inlet pipe, and the liquid fuel inlet is connected to the second hose nozzle through the extension of the liquid inlet pipe; the inlet pipe and the liquid inlet pipe are connected together Wrapped by the handle.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The fluid valve provided by the present invention has a simple and reasonable structure, small size, and is convenient for installation, use and maintenance. It can be used on a flamethrower to control the fluid flow conveniently and accurately, so as to improve the working efficiency of the flamethrower.

(2) The spray gun provided by the present invention achieves liquid fuel injection combustion through gas-liquid mixing and atomization, and the liquid fuel atomization effect is good, so as to achieve cutting processing, so it is suitable for liquid fuel for combustion cutting processing, and solves the problem of existing spray guns. The defect that muskets can only use flammable gases fills the gap in this application, expands energy applications, and has better economic and social benefits.

Description of drawings

Accompanying drawing 1 is the structural representation of fluid valve of the present invention;

Accompanying drawing 2 is the schematic diagram of the internal structure of the fluid valve of the embodiment of Fig. 1;

Accompanying drawing 3 is the schematic structural view of one embodiment of the spray gun of the present invention;

Accompanying drawing 4 is the schematic diagram of structural decomposition of Fig. 3 embodiment;

Accompanying drawing 5,6 is the enlarged schematic view of the partial structure of Fig. 4;

Accompanying drawing 7 is a schematic diagram of the shape and structure of the support seat;

Accompanying drawing 8 is a schematic diagram of the distribution of the internal structure of the support seat;

Accompanying drawing 9 is a schematic cross-sectional view of the combined structure of the front end assembly and the nozzle.

detailed description

The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and so on indicate directions or The terms of positional relationship are based on the direction or positional relationship shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood To limit the present invention. In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only, and should not be interpreted as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

Referring to FIGS. 1 and 2 , the fluid valve 7 provided by the present invention has a valve body 71 , a valve core shaft 72 and an operating member 73 .

The valve body 71 has an input port 711, an output port 712, an internal flow passage 713 connecting the input port and the output port, and a spool hole 714 cross-communicating with the internal flow passage. The input port 711, output port shown in the figure 712 and the internal flow channel 713 form a straight line and continuous arrangement, which is simple in structure and convenient to manufacture; the spool hole 714 is vertically intersected with the internal flow channel 713, and the spool hole 714 is in the form of a blind hole, that is, the inner end of the spool hole 714 It ends in the valve body 71 and is provided with an internal thread segment 7141, while the outer end of the valve core hole 714 extends from the valve body. The internal thread section 7141 crosses the internal flow channel 713 , and the diameter of the intersection of the internal flow channel 713 and the valve core hole 714 is smaller than that of the internal thread section 7141 . The spool shaft 72 is provided with an external thread section 721 and a sealing section 722, and the external thread section 721 and the sealing section 722 are inserted into the valve body 71 along the spool hole 714, and the outer end of the spool shaft 72 is connected to the operating member 73 , the operating member 73 in the figure is a running wheel, which is convenient for manipulation. The external threaded section 721 is threadedly connected with the internal threaded section 7141, and the external threaded section 721 moves on the internal threaded section 7141 by rotating the spool shaft 72 forward and reverse, thereby changing the cross section of the internal flow channel 713, thereby controlling the internal flow. The on-off state of the channel 713. The fluid valve has a simple and reasonable structure, small size, and is convenient for installation, use and maintenance. The cross-section is changed by the movement of screw thread screwing in and out, which reduces manufacturing difficulty and reduces parts, so it is more practical and has a long service life.

Referring to Figures 3 to 9, the present invention provides a torch, which includes the above-mentioned fluid valve, and uses liquid fuel to burn for cutting, which solves the problem that the existing torch can only use flammable gas defect. The torch has a support base 1, a control unit, a front end assembly 2 and a nozzle 3.

The input end of the support base 1 is provided with a first oxygen inlet 11 and a liquid fuel inlet 12, the output end of the support base 1 is provided with an oxygen outlet 13 and a gas-liquid mixing outlet 14, and the internal flow channel includes a first oxygen flow channel 15, The second oxygen flow channel 16 and the liquid flow channel 17; the first oxygen flow channel 15 and the second oxygen flow channel 16 are two parallel flow channels drawn from the first oxygen inlet 11, and the first oxygen inlet 11 passes through The first oxygen flow channel 15 is connected to the oxygen outlet 13 , and the first oxygen inlet 11 is connected to the gas-liquid mixing outlet 14 through the second oxygen flow channel 16 . The liquid fuel inlet 12 is connected to the gas-liquid mixing outlet 14 through a liquid flow channel 17, and the liquid fuel is mixed with oxygen in the gas-liquid mixing outlet 14 to form a gas-liquid mixture. In this embodiment, a buffer portion is provided in the gas-liquid mixing outlet 14, so that the second oxygen flow channel 16 and the liquid flow channel 17 meet in the buffer portion, so that the liquid fuel and oxygen can depressurize and slow down in the buffer portion. , to achieve gas-liquid mixing and output. The control unit includes a first pressure regulating assembly 41, a second pressure regulating assembly 42 and a third pressure regulating assembly 43, the first pressure regulating assembly 41 controls the working state of the first oxygen flow channel 15, and the second pressure regulating assembly The component 42 controls the working state of the second oxygen flow channel 16; the third pressure regulating component 43 controls the working state of the liquid flow channel 17; in this embodiment, the first pressure regulating component 41, the second pressure regulating component 42 and the The third pressure regulating assembly 43 is in the form of a pressure regulating valve, and the flow of the corresponding flow channel is controlled by turning the handwheel to drive the spool to move. The specific adjustment principle is the prior art, and will not be repeated here. The front end assembly 2 has a second oxygen inlet 21, a gas-liquid mixing inlet 22 and a live interface 23 for connecting the nozzle 3, the second oxygen inlet 21 is connected to the oxygen outlet 13 through the outlet pipe 5; the gas-liquid mixing inlet 22 The gas-liquid mixing outlet 14 is connected through the gas-liquid pipe 6, and a fluid valve 7 and a venturi tube 8 are embedded between the gas-liquid pipe 6 and the gas-liquid mixing outlet 14. The structure of the fluid valve 7 is as described above, which meets the switch control requirements. After the Venturi tube 8 is connected with the gas-liquid mixing outlet 14, it guides the movement of the gas-liquid mixture based on the Venturi principle. The inside of the Venturi tube 8 has a through hole that forms an inverted cone along the gas outlet direction, and is connected with the gas-liquid mixing outlet 14 to form a Venturi tube. structure. This creates a pressure difference in the flow of the gas-liquid mixture leading to the front end assembly 2, and obtains the adsorption function, which is conducive to the inhalation and mixing of the combustion liquid, so that the torch can adjust itself to achieve its best combustion performance, which is beneficial to the cutting work.

Referring to Figures 3 to 9, in this embodiment, the nozzle 3 includes an outer tube 31 and an inner core 32, the inner core 32 is positioned in the outer tube 31 and arranged coaxially with the outer tube 31; the gas outlet end of the inner core 32 There is a tapered surface along the air outlet direction, and a tapered groove 321 is provided on the tapered surface. The corresponding inner peripheral surface of the outer tube 31 is assembled with the tapered surface of the inner core 32 and enclosed by the tapered groove 321 The spray hole is formed, and the tapered groove 321 is processed on the surface, which has a simple structure, is convenient for manufacture, maintenance and cleaning, etc., and also satisfies the atomization and spraying of the gas-liquid mixture. The inner core 32 is also provided with blowing holes 322 , which are distributed in the inner middle of the inner core 32 and penetrate axially, and the tapered grooves 321 are distributed on the outer periphery of the blowing holes 322 . The blowing hole 322 communicates with the second oxygen inlet 21, and the end of the blowing hole 322 away from the second oxygen inlet 21 is designed to be narrowed to obtain pressurized blowing; the spray hole formed by the tapered groove 321 communicates with the gas-liquid mixing inlet 22 The oxygen introduced by the front-end assembly 2 is blown out in a straight line toward the first direction from the air-blowing hole 322, while the gas-liquid mixture introduced by the front-end assembly 2 is atomized and ejected from the spray hole formed by the conical groove 321, and the conical The spraying direction of the groove 321 intersects the blowing direction of the air blowing hole 322 to form an intersection point, which is located directly in front of the air blowing hole 322 and falls on the central axis of the air blowing hole 322 . In this embodiment, the air outlet end of the inner core 32 is retracted by a certain distance relative to the outer end of the outer tube 31, so as to ensure that the atomized spray is not affected by the external environment, and at the same time effectively prevent impurities such as cutting dust from clogging the spray hole , to ensure the service life. In this embodiment, it is preferable that the intersection point formed by the spray and air blow is outside the outer end of the outer tube 31 in order to obtain a better combustion cutting point.

In this embodiment, the nozzle 3 is locked to the live interface 23 of the front end assembly 2 through a nut, which is convenient for disassembly and maintenance, and is assembled with multi-cone surfaces, which is accurately positioned and easy to install, and the positional relationship between the parts And good coaxiality. The inner core 32 is also provided with a ring platform 323, which is close to the inner end of the inner core and is stuck on the inner end of the outer tube 31. The inner end of the outer tube 31 is provided with an eversion ring 312, and the nut It is threadedly connected with the front end assembly 2 and supports the everted ring rim 312, and the ring platform 323 is embedded in the joint 23 through a bevel fitting method, and the assembly of the nozzle is established by pushing outward and internally, and the assembly structure is stable. The ring platform 323 is provided with distribution holes 324 , which are distributed around the blowing holes 322 of the inner core 32 , and the distribution holes 324 communicate with the gas-liquid mixing inlet 22 and the tapered groove 321 . In this embodiment, the inside of the outer tube 31 is also provided with a pressure equalization chamber 311, which is located between the distribution hole 324 and the tapered groove 321, and sprays the gas-liquid mixture introduced by the front end assembly 2. The pre-exit buffer not only enables the gas-liquid mixture to be mixed again, but also ensures that the gas-liquid mixture in each tapered groove 321 is atomized and sprayed evenly and continuously, which is beneficial to combustion and cutting.

In this embodiment, the support base 1 is also provided with a connecting hole 18 coaxially connected with the gas-liquid mixing outlet 14. The connecting hole 18 extends from the opposite direction of the gas-liquid mixing outlet 14, and the connecting hole 18 connects the second The oxygen flow channel 16, the liquid flow channel 17 and the gas-liquid mixing outlet 14 are connected together, and an air guide tube 181 is embedded in the connecting hole 18. One end of the air guide tube 181 communicates with the second oxygen flow channel 16, and the other end of the air guide tube 181 One end points to the gas-liquid mixing outlet 14 and is coaxial with the gas outlet direction of the gas-liquid mixing outlet 14, and the liquid flow channel 17 guides the liquid fuel from the outer periphery of the air guide pipe 181 into the gas-liquid mixing outlet 14; the third pressure regulating assembly 43 is correspondingly connected The hole 18 is assembled and cooperates with the air duct 181 to control the working state of the second oxygen flow channel 16 . The structure is simple, convenient for processing and assembling, and can facilitate the construction of a Venturi tube structure system. The first oxygen inlet 11 is extended and connected to the first hose nozzle 112 through the inlet pipe 111, and the liquid fuel inlet 12 is extended and connected to the second hose nozzle 122 through the liquid inlet pipe 121; the inlet pipe 111 and the liquid inlet The tubes 121 are wrapped together by the handle 9 to provide hand-held use, the overall structure is simple, easy to manufacture, and low investment cost.

The torch provided by the present invention achieves liquid fuel jet combustion through gas-liquid mixing and atomization, and the atomization effect of the liquid fuel is good to achieve cutting processing, so it is suitable for liquid fuel to be used for combustion and cutting processing, and solves the problem that the existing torch can only Using the defect of flammable gas to fill the application vacancy and expand the application of energy has better economic and social benefits. The above-mentioned fluid valve is used to control the firepower, the structure is simple and reasonable, the volume is small, the installation, use and maintenance are convenient, the working efficiency of the flamethrower is improved, and the service life is long.

Of course, the present invention has been described in detail above in conjunction with the embodiments, only to illustrate the technical conception and characteristics of the present invention, and its purpose is to allow those familiar with this technology to understand the content of the present invention and implement it. Substantial equivalent changes or modifications shall fall within the protection scope of the present invention.

Claims (9)

1. A fluid valve, characterized in that, comprising: A valve body (71), the valve body (71) has an input port (711), an output port (712), an internal flow channel (713) connecting the input port and the output port, and a valve core cross-communicated with the internal flow channel hole (714), the inner end of the spool hole (714) ends in the valve body (71) and is provided with an internal thread segment (7141), and the outer end of the spool hole (714) extends from the valve body, the The internal thread segment (7141) traverses the internal flow channel (713); The spool shaft (72), the spool shaft (72) is provided with an external thread section (721) and a sealing section (722), and the external thread section (721) and the sealing section (722) conform to the spool hole (714) Insert the valve body (71), and the outer end of the spool shaft (72) is connected to the operating piece (73), the outer threaded section (721) is threaded with the inner threaded section (7141), and through the outer threaded section ( 721) moves on the internal thread segment (7141) to control the on-off state of the internal flow channel (713). 2. A fluid valve according to claim 1, characterized in that, the valve core hole (714) is in vertical cross communication with the internal flow channel (713), and the internal flow channel (713) is connected to the valve core hole (714) ) The hole diameter of the junction is smaller than the hole diameter of the internal thread section (7141). 3. A spray gun, characterized in that it comprises a fluid valve according to claim 1 or 2 above. 4. A kind of flame-throwing gun according to claim 3, characterized in that, the flame-throwing gun is a tool that adopts liquid fuel combustion for cutting and processing, and has: A support seat (1), the support seat (1) has a first oxygen inlet (11), a liquid fuel inlet (12), an oxygen outlet (13), a gas-liquid mixing outlet (14), and a first oxygen flow channel (15) , the second oxygen flow channel (16) and the liquid flow channel (17), the first oxygen flow channel (15) and the second oxygen flow channel (16) are two flow channels drawn from the first oxygen inlet (11), The first oxygen inlet (11) is connected to the oxygen outlet (13) through the first oxygen flow channel (15), and the first oxygen inlet (11) is connected to the gas-liquid mixing outlet (14) through the second oxygen flow channel (16), The liquid fuel inlet (12) is connected to the gas-liquid mixing outlet (14) through a liquid flow channel (17); The control unit is connected to the support base (1), the control unit includes a first pressure regulating assembly (41), a second pressure regulating assembly (42) and a third pressure regulating assembly (43), the first pressure regulating assembly The component (41) controls the working state of the first oxygen flow channel (15), the second pressure regulating component (42) controls the working state of the second oxygen flow channel (16), and the third pressure regulating component (43) controls the liquid flow channel (17) working status; Front end assembly (2), the front end assembly (2) has a second oxygen inlet (21), a gas-liquid mixing inlet (22) and a joint (23), the second oxygen inlet (21) through the outlet pipe (5 ) is connected to the oxygen outlet (13), the gas-liquid mixing inlet (22) is connected to the gas-liquid mixing outlet (14) through the gas-liquid pipe (6), and is between the gas-liquid pipe (6) and the gas-liquid mixing outlet (14) Embed the fluid valve (7) and the venturi tube (8), the venturi tube (8) is connected with the gas-liquid mixing outlet (14) to guide the movement of the gas-liquid mixture based on the Venturi principle, and the fluid valve (7) controls the gas-liquid tube ( 6) The flow rate of the gas-liquid mixture; The nozzle (3), which is assembled on the joint (23) of the front end assembly (2), is used to atomize and spray the oxygen and gas-liquid mixture introduced by the front end assembly (2). 5. A spray gun according to claim 4, characterized in that, the nozzle (3) includes an outer tube (31) and an inner core (32), and the inner core (32) is positioned inside the outer tube (31) And arranged coaxially with the outer pipe (31), the air outlet end of the inner core (32) is provided with a tapered surface along the air outlet direction, and the tapered surface is provided with a tapered groove (321), and the outer pipe (31) The corresponding inner peripheral surface matches the tapered surface of the inner core (32) and is enclosed with the tapered groove (321) to form a spray hole. The inner core (32) is also provided with a blow hole (322). The air holes (322) are distributed in the inner middle of the inner core (32) and penetrate axially, and the tapered grooves (321) are distributed on the outer periphery of the air blowing holes (322). 6. A spray gun according to claim 5, characterized in that the nozzle (3) is locked to the live joint (23) of the front end assembly (2) through a nut, and the inner core (32) is also A ring platform (323) is provided, the ring platform (323) is close to the inner end of the inner core and is stuck on the inner end of the outer tube (31), and the inner end of the outer tube (31) is provided with an eversion ring (312 ), the nut is threadedly connected with the front end assembly (2) and supports the everted ring edge (312), and the ring platform (323) is embedded in the joint (23) through a bevel fitting method, and the ring platform ( 323) is provided with a split hole (324), the split hole (324) is distributed around the blowing hole (322) of the inner core (32), and the split hole (324) communicates with the gas-liquid mixing inlet (22) and the tapered groove (321 ). 7. A spray gun according to claim 5 or 6, characterized in that a pressure equalization chamber (311) is further provided inside the outer tube (31). 8. A fire spray gun according to claim 4, characterized in that, the support base (1) is also provided with a connecting hole (18) coaxially connected with the gas-liquid mixing outlet (14), and the connecting hole (18) Extending in the opposite direction from the gas-liquid mixing outlet (14), the connecting hole (18) connects the second oxygen flow channel (16), the liquid flow channel (17) and the gas-liquid mixing outlet (14), And an air guide tube (181) is embedded in the connecting hole (18), one end of the air guide tube (181) is connected to the second oxygen flow channel (16), and the other end of the air guide tube (181) points to the gas-liquid mixing outlet (14) And it is coaxial with the air outlet direction of the gas-liquid mixing outlet (14), the liquid flow channel (17) guides the liquid fuel from the outer periphery of the air guide tube (181) into the gas-liquid mixing outlet (14), and the third pressure regulating assembly (43 ) is assembled corresponding to the connecting hole (18) and cooperates with the airway tube (181) to control the working state of the second oxygen flow channel (16). 9. The torch according to claim 4, characterized in that, the first oxygen inlet (11) extends through an air intake pipe (111) and is connected to the first hose nozzle (112), and the liquid fuel inlet (12) Extend and connect the second hose nozzle (122) through the liquid inlet pipe (121), and the air inlet pipe (111) and the liquid inlet pipe (121) are wrapped together by the handle (9).

Images