Air-cooled plasma torch with protective gas

Abstract

The utility model relates to a kind of air-cooled plasma cutting torch with protective gas, it is related to cutting torch technical field, including cutting torch body, gun head is installed on the cutting torch body, electrode holder is equipped in the gun head, the one end of the electrode holder is equipped with electrode, the other end of the electrode holder is equipped with gas core assembly, the periphery of the gas core assembly is equipped with insulating sleeve and protective cover, the inside of gun head is separated by insulating sleeve, gas core assembly with first flow channel and second flow channel of inside and outside, first gas guide hole and second gas guide hole are equipped on the insulating sleeve, the first gas guide hole is used to guide compressed gas into first flow channel, compressed gas is branched in the utility model, part acts on key heating component, heat is quickly taken away using gas flow, forms continuous efficient cooling circulation, another part compressed gas forms protective gas curtain at gun head end, air is isolated from cutting area contact, can reduce oxidation reaction, reduce kerf burr, crack and other defects.

Description

Technical Field

[0001] This utility model relates to the field of cutting torch technology, and in particular to an air-cooled plasma cutting torch with a protective gas. Background Technology

[0002] Plasma cutting technology is widely used in metal processing, machinery manufacturing and other fields due to its high efficiency and precision. Its core principle is to melt the metal by generating a high-temperature plasma arc between the electrode and the workpiece, thereby achieving the cutting operation.

[0003] Traditional plasma cutting torches still have the following technical defects in practical applications: On the one hand, during the cutting process, core components such as electrodes and nozzles are constantly exposed to the high-temperature plasma arc environment, which easily generates a large amount of heat accumulation. If the heat cannot be dissipated in time, the temperature of the components will rise sharply, which will shorten their service life. Existing cooling methods mostly rely on additional water cooling systems, which can meet certain cooling requirements, but increase the complexity, weight and maintenance costs of the equipment, and are limited in applicability in mobile operations or small equipment. On the other hand, the high-temperature environment in the cutting area easily causes the metal to undergo a violent oxidation reaction with oxygen in the air, resulting in defects such as oxide layers, burrs and cracks on the cut surface. This not only affects the smoothness of the cut surface and the subsequent processing accuracy, but may also reduce the mechanical properties of the workpiece. Based on this, an air-cooled plasma cutting torch with a protective gas is proposed. Utility Model Content

[0004] To overcome the problems existing in related technologies, this utility model provides an air-cooled plasma cutting torch with protective gas. By splitting the compressed gas, one part acts on the key heating components, and the heat is quickly removed by utilizing the heat absorption and heat dissipation characteristics of gas flow. The other part forms a protective gas curtain at the end of the torch head.

[0005] To achieve the above objectives, this utility model provides an air-cooled plasma cutting torch with a protective gas, comprising a cutting torch body, a torch head mounted on the cutting torch body, an electrode seat inside the torch head, an electrode at one end of the electrode seat, and a gas core assembly at the other end of the electrode seat. An insulating sleeve and a protective cover are provided around the gas core assembly. The torch head is internally divided into a first flow channel and a second flow channel by the insulating sleeve and the gas core assembly. The insulating sleeve has a first air guide hole and a second air guide hole. The first air guide hole is used to guide compressed gas into the first flow channel, and the second air guide hole is used to guide compressed gas into the second flow channel.

[0006] Preferably, a connecting sleeve is provided at the connection between the cutting torch body and the torch head, and a retaining ring is provided at the transition between the connecting sleeve and the insulating sleeve, with a retaining ring hole provided on the retaining ring.

[0007] Preferably, the first flow channel is provided with a vortex ring, and the vortex ring is provided with a vortex ring oblique hole.

[0008] Preferably, the gas core assembly includes a gas core facing the electrode, an inner core connected to one end of the gas core, and an extension rod connected to one end of the inner core facing away from the gas core.

[0009] Preferably, the end of the extended rod of the main body core away from the main body core is provided with a ventilation conductive rod extending into the cutting torch body, and the end of the ventilation conductive rod is provided with an air inlet.

[0010] Preferably, a nozzle is provided inside the gun head and in front of the electrode, and a plurality of vent holes are provided at the end of the protective cover and opposite the nozzle.

[0011] Preferably, a spring is provided on the outside of the inner core extension rod of the main body, and the spring presses against the inner core extension rod of the main body.

[0012] The technical solution provided by this utility model can include the following beneficial effects: 1. In this utility model, after the compressed gas is diverted, a portion of it acts on the key heat-generating components. The heat is quickly removed by utilizing the heat absorption and dissipation characteristics of the gas flow, forming a continuous and efficient cooling cycle. No additional cooling equipment is required; cooling can be achieved by relying on the existing compressed air system, ensuring that the cutting torch maintains a suitable temperature during long-term, high-intensity operations and guaranteeing the stability of the cutting torch.

[0013] 2. In this utility model, another part of the compressed gas forms a protective air curtain at the end of the gun head, which isolates the air from contact with the cutting area, thereby reducing oxidation reaction, reducing defects such as burrs and cracks on the cut surface, and ensuring the smoothness and quality of the cut surface.

[0014] 3. The vortex ring with oblique holes can make the gas form a rotating airflow, which can not only cool the gas evenly, but also enhance the concentration of the plasma arc.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0016] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0017] Figure 1 This is a cross-sectional structural schematic diagram of the present invention; Figure 2 This is a utility model Figure 1 Enlarged diagram of point A in the diagram; Figure 3This is an overall appearance drawing of this utility model; Figure 4 This is a cross-sectional view of the cutting torch body and nozzle of this utility model.

[0018] The correspondence between the labels and component names in the attached figures is as follows: 1. Cutting torch body; 101. Torch head; 2. Air inlet; 3. Air-conducting rod; 4. Inner core extension rod; 5. Inner core; 6. Insulating sleeve; 61. First air guide hole; 62. Second air guide hole; 7. Protective cover; 8. Nozzle; 9. Electrode holder; 10. Air core; 11. Electrode; 12. Connecting sleeve; 13. Spring; 14. Vortex ring; 141. Vortex ring oblique hole; 15. Retaining ring; 16. Retaining ring small hole; 17. First flow channel; 18. Second flow channel. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. The preferred embodiments of this utility model will now be described in more detail with reference to the accompanying drawings. Although preferred embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this utility model more thorough and complete, and to fully convey the scope of this utility model to those skilled in the art.

[0020] The technical solutions of the embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0021] See Figures 1-4As shown, this utility model proposes an air-cooled plasma cutting torch with a protective gas, including a cutting torch body 1, a torch head 101 mounted on the cutting torch body 1, an electrode seat 9 inside the torch head 101, an electrode 11 at one end of the electrode seat 9, a nozzle 8 inside the torch head 101 and located in front of the electrode 11, and a protective cover 7 with several vent holes at its end facing the nozzle 8. The electrode 11 serves as the source of the plasma arc, and a gas core assembly is located at the other end of the electrode seat 9. The electrode seat 9 not only provides stable support for the electrode 11, but also forms a basic channel for gas flow through cooperation with the gas core assembly. The component is surrounded by an insulating sleeve 6 and a protective cover 7, with the protective cover 7 located on the outermost side. The insulating sleeve 6 uses material properties (such as high-temperature resistant ceramic) to block the current conduction between the electrode 11 and external components, avoiding the risk of leakage. The protective cover 7 can be made of high-strength plastic or alloy material, which can resist the splashing slag and high-temperature radiation during the cutting process, extending the service life of the gun head 101. The gun head 101 is internally separated into a first flow channel 17 and a second flow channel 18 by the insulating sleeve 6 and the air core assembly. The insulating sleeve 6 is provided with a first air guide hole 61 and a second air guide hole 62. The first air guide hole 61 is used to guide compressed gas. The first flow channel 17 is connected to the second flow channel 18 via a second air guide hole 62. A connecting sleeve 12 is provided at the connection between the cutting torch body 1 and the torch head 101. A retaining ring 15 is provided at the transition between the connecting sleeve 12 and the insulating sleeve 6. The retaining ring 15 has a retaining ring hole 16. A vortex ring 14 is provided in the first flow channel 17. The vortex ring 14 has vortex ring oblique holes 141. These vortex ring oblique holes 141 are distributed at a specific angle to form a rotating airflow, which not only provides uniform cooling but also enhances the concentration of the plasma arc. The uniform gas distribution ensures stable arc combustion and reduces the risk of arc burn-out. The fluctuations and instabilities of the electric arc improve the cutting quality. The gas entering the second flow channel 18 through the second air guide hole 62 will flow along the gap between the insulating sleeve 6 and the protective cover 7, and finally form a protective air curtain at the end of the gun head 101, which isolates the air from the cutting area, reduces oxidation reaction, and ensures the smoothness of the cutting surface. Secondly, baffles (not shown) can be set on the vortex ring 14 to change the flow direction of the compressed gas in the first flow channel 17, so that more compressed gas away from the center of the gun head 101 flows to the center of the gun head 101 to improve the air cooling effect.

[0022] Among them, the first flow channel 17 and the second flow channel 18, the first air guide hole 61 and the second air guide hole 62 play an important role. Through multi-dimensional design, they can control the gas, among which the size, number and length of the holes are key influencing factors.

[0023] Firstly, the difference in aperture between the first flow channel 17 and the second flow channel 18 directly affects the gas flow rate and volume. When the aperture of the first flow channel 17 is larger than that of the second flow channel 18, under the same gas source pressure, more gas will preferentially flow through the first flow channel 17, thereby achieving preliminary control over the gas distribution ratio in the two channels. As for the first air guide hole 61 and the second air guide hole 62, the aperture size determines the amount and rate of gas entering the corresponding flow channel. A smaller air guide hole aperture can play a throttling role and slow down the gas output speed, while a larger aperture allows the gas to pass through more quickly.

[0024] Secondly, the number of holes is also an important factor in achieving gas distribution and control. If the number of first air guide holes 61 corresponding to the first flow channel 17 is large, while the number of second air guide holes 62 corresponding to the second flow channel 18 is small, then under the condition that the total gas supply is stable, the total amount of gas distributed to each first air guide hole 61 through the first flow channel 17 will increase accordingly, thereby allowing the area connected to the first air guide hole 61 to obtain more gas.

[0025] Furthermore, the length of the orifice also affects gas distribution and control. For example, if the lengths of the first flow channel 17 and the second flow channel 18 are different, the resistance encountered by the gas flowing within them will differ. A longer flow channel will increase the pressure loss during gas flow, resulting in a lower gas pressure reaching the end vent. Conversely, a shorter flow channel can reduce pressure loss, allowing the gas to be delivered to the end at a higher pressure. The lengths of the first vent 61 and the second vent 62 also affect gas output. A longer vent will create some obstruction to the gas, making the gas output more stable, while a shorter vent will allow the gas to be discharged more directly. The specific settings can be configured according to actual needs.

[0026] In addition, the shape and surface roughness of the flow channel and air guide hole can also affect the distribution and control of gas to a certain extent. For example, a smooth inner wall can reduce the frictional resistance of gas flow and ensure the smoothness of gas flow; while a specific curved shape can change the direction of gas flow and realize the directional distribution of gas. By comprehensively adjusting these parameters, more precise and efficient distribution and control of gas can be achieved to meet the needs of different processes.

[0027] Among them, see Figure 1 and Figure 2As shown, the gas core assembly includes a gas core 10 facing the electrode 11. The gas core 10 is a key component for gas flow and discharge coordination. Its end is tightly connected to the inner core 5 of the main body. The two are precisely matched to ensure the continuity of gas transmission. The end of the inner core 5 away from the gas core 10 extends and is connected to the inner core extension rod 4. A spring 13 is sleeved on the outside of the inner core extension rod 4. The spring 13 provides a stable axial force to the inner core extension rod 4 in an elastic pressing manner, ensuring that the position of the inner core 5 and related components is relatively stable during the cutting operation, maintaining the consistency of the gas passage and the discharge gap. A ventilation conductive rod 3 is provided at the end of the inner core extension rod 4 away from the inner core 5. The ventilation conductive rod 3 extends into the interior of the cutting torch body 1, and an air inlet 2 is provided at the end of the ventilation conductive rod 3.

[0028] As described above, during actual operation, compressed gas enters from the air inlet 2, passes through the ventilation conductive rod 3, enters the inner core extension rod 4 of the main body, then enters the gas core 10 through the inner core 5 of the main body, passes through the inner wall of the electrode 11, enters the inner wall of the electrode seat 9, and then enters the interior of the connecting sleeve 12 through the small hole 16 of the retaining ring 15. After passing through the first air guide hole 61 and the second air guide hole 62 of the insulating sleeve 6, a portion of the gas is diverted to the nozzle seat to form protective gas. Specifically, after passing through the small hole of the nozzle seat, it passes through the interior of the protective cover 7 to protect the electric arc at the end of the protective cover 7. The other portion enters the space between the insulating sleeve 6 and the eddy ring 14, and after passing through the oblique hole 141 of the eddy ring, it forms cutting gas. After being ionized between the electrode 11 and the nozzle 8 to form a plasma arc, it is ejected through the small hole of the nozzle to cut the metal.

[0029] The purpose of this design is to split the compressed air, so that a portion of the airflow can be precisely applied to the key heat-generating components of the cutting torch. By utilizing the heat absorption and dissipation characteristics of compressed air flow, the heat generated by the cutting torch can be quickly removed, forming a continuous and efficient cooling cycle. This self-cooling method does not require the addition of complex cooling equipment and can be achieved by relying on the existing compressed air supply system. This simplifies the structure, reduces energy consumption, and ensures that the cutting torch maintains a suitable working temperature during long-term, high-intensity cutting operations, thus guaranteeing the stability and durability of the cutting torch. Meanwhile, the other part of the compressed gas after diversion can act as a protective gas. During the cutting process, the cutting area is prone to react with oxygen and other components in the air, leading to oxidation and other problems on the cut surface, affecting the smoothness, precision and internal quality of the cut surface. Introducing the diverted compressed gas into the cutting area can form a dense gas protective layer around the cutting point, effectively isolating the cutting area from external air interference. This protective gas can prevent active gases such as oxygen from reacting with high-temperature metals, reducing the generation of slag, reducing defects such as burrs and cracks on the cut surface, and thus significantly improving the cutting quality.

[0030] The present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to the present invention. Furthermore, it is understood that the steps in the method of the present invention embodiments can be adjusted, combined, and deleted according to actual needs, and the structure in the device of the present invention embodiments can be combined, divided, and deleted according to actual needs. The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An air-cooled plasma cutting torch with a protective gas, comprising a cutting torch body (1), wherein a torch head (101) is mounted on the cutting torch body (1), characterized in that, The gun head (101) is provided with an electrode seat (9), one end of the electrode seat (9) is provided with an electrode (11), the other end of the electrode seat (9) is provided with a gas core assembly, and the gas core assembly is provided with an insulating sleeve (6) and a protective cover (7) around its periphery. The gun head (101) is divided into an inner and outer first flow channel (17) and a second flow channel (18) by an insulating sleeve (6) and a gas core assembly. The insulating sleeve (6) is provided with a first air guide hole (61) and a second air guide hole (62). The first air guide hole (61) is used to guide compressed gas into the first flow channel (17), and the second air guide hole (62) is used to guide compressed gas into the second flow channel (18). The distribution and control of compressed gas are realized through the first air guide hole (61), the second air guide hole (62), the first flow channel (17) and the second flow channel (18).

2. The air-cooled plasma cutting torch with protective gas according to claim 1, characterized in that, A connecting sleeve (12) is provided at the connection between the cutting torch body (1) and the torch head (101), and a retaining ring (15) is provided at the transition between the connecting sleeve (12) and the insulating sleeve (6), and a retaining ring hole (16) is provided on the retaining ring (15).

3. The air-cooled plasma cutting torch with protective gas according to claim 1, characterized in that, The first flow channel (17) is provided with a vortex ring (14), and the vortex ring (14) is provided with a vortex ring oblique hole (141).

4. The air-cooled plasma cutting torch with protective gas according to claim 1, characterized in that, The gas core assembly includes a gas core (10) facing the electrode (11), and an inner core (5) is connected to the end of the gas core (10). An extension rod (4) is connected to the end of the inner core (5) facing away from the gas core (10).

5. The air-cooled plasma cutting torch with protective gas according to claim 4, characterized in that, The extended rod (4) of the main body core is provided with a ventilation conductive rod (3) extending into the cutting torch body (1) at one end away from the main body core (5), and an air inlet (2) is provided at the end of the ventilation conductive rod (3).

6. The air-cooled plasma cutting torch with protective gas according to claim 1, characterized in that, The nozzle (8) is provided inside the gun head (101) and in front of the electrode (11), and the protective cover (7) has several ventilation holes at its end and facing the nozzle (8).

7. The air-cooled plasma cutting torch with protective gas according to claim 4, characterized in that, The inner core extension rod (4) of the main body is provided with a spring (13) on the outside, and the inner core extension rod (4) is pressed by the spring (13).

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