Plasma arc cutting torch

Abstract

The utility model discloses a plasma arc cutting torch, and belongs to the technical field of plasma. The device mainly comprises an outer sleeve, a base, a protective cap, an electrode holder, a nozzle and an electrode, the nozzle is mounted at the front end of the base, the electrode is mounted on the electrode holder and close to the nozzle, the front end of the electrode extends into the nozzle, the protective cap sleeves the outer side of the nozzle, a water inlet runner is communicated with a central water pipe, and one end of the central water pipe extends into an inner cavity of the electrode. An electrode cooling cavity communicated with the central water pipe is arranged between the outer wall of the central water pipe and the inner wall of the inner hole, the second cooling runner is in contact with the nozzle, a protective gas cavity is arranged between the outer wall of the nozzle and the inner wall of the protective cap, a protective cap center hole aligned with a nozzle center hole of the nozzle is formed in the end of the protective cap, and the protective gas cavity is communicated with the protective cap center hole. The electrode cooling cavity is communicated with the second cooling flow channel, the protective gas cavity is communicated with the second cooling flow channel, and the water outlet flow channel is communicated with the second cooling flow channel. The plasma arc cutting torch can restrain smoke emission.

Description

Technical Field

[0001] This utility model relates to the field of plasma technology, specifically to a plasma arc cutting torch. Background Technology

[0002] Plasma arc cutting involves passing a mixture of gases through a high-frequency electric arc. The gases can be air, or a mixture of hydrogen, argon, and nitrogen. The high-frequency arc "decomposes" or ionizes some of the gases, breaking them down into basic atomic particles, thus generating "plasma." The arc then jumps onto the workpiece, and high-pressure gas blows the plasma out of the torch nozzle. The high energy released when the various gases in the plasma return to their normal state generates high temperatures, rapidly melting the part of the workpiece to be cut. The molten metal is then blown away by the high-pressure gas stream. The plasma arc cutting torch is the device that generates the plasma arc in plasma arc cutting.

[0003] Existing plasma arc cutting torches often produce a large amount of smoke and dust during combustion due to incomplete combustion of the workpiece or impurities in the gas used in the plasma arc cutting torch. The random release of smoke and dust can harm the human body and is not in line with the concept of environmental protection.

[0004] Therefore, it is necessary to provide a new plasma arc cutting torch. Utility Model Content

[0005] Based on the aforementioned problems in the existing technology, the purpose of this utility model embodiment is to provide a plasma arc cutting torch that can suppress the emission of smoke and dust.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A plasma arc cutting torch is provided, comprising an outer casing, a base, a protective cap, an electrode holder, a nozzle, and an electrode. The base, electrode holder, nozzle, and electrode are all housed and installed inside the outer casing. The nozzle is installed at the front end of the base. The electrode is installed on the electrode holder and close to the nozzle, with its front end extending into the interior of the nozzle. The protective cap is fitted over the outside of the nozzle. The electrode holder has an inlet channel and an outlet channel. A central water pipe is connected to the inlet channel. One end extends into the inner cavity of the electrode. An electrode cooling cavity communicating with the central water pipe is provided between the outer wall of the central water pipe and the inner wall of the inner hole. A second cooling channel is provided on the base. The second cooling channel contacts the nozzle. A protective air cavity is provided between the outer wall of the nozzle and the inner wall of the protective cap. The end of the protective cap is provided with a protective cap center hole aligned with the nozzle center hole. The protective air cavity communicates with the protective cap center hole. The electrode cooling cavity communicates with the second cooling channel. The water outlet channel communicates with the second cooling channel.

[0007] Furthermore, the plasma arc cutting torch also includes an insulating base, which is disposed between the electrode base and the base.

[0008] Furthermore, an annular nozzle cooling chamber is formed between the outer wall of the base and the nozzle, and the nozzle cooling chamber is connected to the cooling channel and the water outlet channel.

[0009] Furthermore, the base is also provided with a cooling channel three spaced apart from the cooling channel two. The cooling channel three communicates with the nozzle cooling chamber. A distribution chamber two is provided between the outer wall of the base and the inner wall of the outer sleeve. The distribution chamber two communicates with the protective gas chamber. A guide hole two is provided on the outer wall of the base, which communicates between the cooling channel two and the distribution chamber two. A guide hole three is also provided on the outer wall of the base, which communicates between the cooling channel three and the distribution chamber two.

[0010] Furthermore, the plasma arc cutting torch also includes a protective gas pipe for connecting the protective gas, the base is provided with a protective gas flow channel communicating with the protective gas pipe, and the outer wall of the base is provided with a guide hole four communicating with the protective gas flow channel and the distribution chamber two.

[0011] Furthermore, the plasma arc cutting torch also includes a plasma pipe for receiving the ion gas flow, a distribution ring is provided on the outer sleeve of the electrode, an ion gas flow channel connected to the plasma pipe is provided on the base, a distribution cavity four is provided between the inner wall of the base, the outer wall of the insulating seat and the outer wall of the distribution ring, an ion gas flow chamber is provided between the inner wall of the distribution ring, the outer wall of the electrode and the inner wall of the nozzle, the distribution cavity four is connected to the ion gas flow chamber, and the ion gas flow chamber is connected to the central hole of the nozzle.

[0012] Furthermore, the distribution ring is provided with interconnected homogenization channels and vortex channels. The distribution ring is provided with multiple homogenization channels, which are arranged circumferentially around the distribution ring. The end of the homogenization channel away from the nozzle is connected to the distribution chamber. The distribution ring is provided with multiple vortex channels, and the end of the vortex channel near the nozzle is connected to the ion flow chamber.

[0013] Furthermore, a cooling channel 1 is provided between the outer wall of the central water pipe and the inner wall of the electrode holder, the cooling channel 1 being connected to the water inlet channel, and a distribution cavity 1 is provided between the inner wall of the insulating seat and the outer wall of the electrode holder, the distribution cavity 1 being connected between the cooling channel 1 and the cooling channel 2.

[0014] Furthermore, the plasma arc cutting torch also includes an inlet pipe for receiving coolant and an outlet pipe for returning coolant. The inlet pipe is connected to the electrode base and communicates with the inlet channel, and the outlet pipe is connected to the electrode base and communicates with the outlet channel.

[0015] Furthermore, one end of the distribution ring abuts against the insulating seat, and the other end of the distribution ring abuts against the stepped surface of the nozzle inner wall.

[0016] Compared with the prior art, the above-described technical solutions in this utility model embodiment have at least one of the following beneficial effects:

[0017] The plasma arc cutting torch provided by this utility model includes an outer casing, a base, a protective cap, an electrode holder, a nozzle, and an electrode. The base, electrode holder, nozzle, and electrode are all housed and installed inside the outer casing. The nozzle is installed at the front end of the base, and the electrode is installed on the electrode holder and close to the nozzle, with the front end of the electrode extending into the interior of the nozzle. The protective cap is fitted over the outside of the nozzle. The electrode holder has an inlet channel and an outlet channel. A central water pipe is connected to the inlet channel, and one end of the central water pipe extends into the inner cavity of the electrode. An electrode cooling cavity, communicating with the central water pipe, is formed between the outer wall of the central water pipe and the inner wall of the inner bore. The base has a second cooling channel that contacts the nozzle. The outer wall of the nozzle is in contact with the protective cap. The inner walls of the device are spaced apart to form a protective air chamber. The end of the protective cap is provided with a protective cap center hole that is aligned with the nozzle center hole of the nozzle. The protective air chamber is connected to the protective cap center hole. The electrode cooling chamber is connected to the second cooling channel. The water outlet channel is connected to the second cooling channel. Through the above design, the coolant can not only cool the electrode when it enters the electrode cooling chamber, but also cool the nozzle when it enters the second cooling channel and contacts the nozzle. The coolant can also adhere to the smoke particles generated by plasma arc cutting when it enters the protective air chamber and is sprayed out, causing the smoke particles to settle, inhibiting the emission of smoke, reducing the harm to the human body, and improving environmental protection. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 A cross-sectional view of a plasma arc cutting torch provided in an embodiment of this utility model.

[0020] Figure 2 for Figure 1 An enlarged schematic diagram of region A in the middle.

[0021] Figure 3 Another cross-sectional view of the plasma arc cutting torch provided in this embodiment of the utility model.

[0022] Figure 4 for Figure 3 A magnified view of region B in the middle.

[0023] Figure 5 A three-dimensional structural schematic diagram of the distribution ring provided in an embodiment of this utility model.

[0024] Figure 6 A top view of the distribution ring provided in an embodiment of this utility model.

[0025] Figure 7 For along Figure 6 A cross-sectional view along the EE direction.

[0026] The figures in the diagram are labeled as follows: 1. Outer jacket; 2. Base; 21. Cooling channel two; 22. Cooling channel three; 23. Guide hole two; 24. Guide hole three; 25. Ion gas flow channel; 26. Protective gas flow channel; 27. Guide hole four; 3. Protective cap; 31. Protective cap center hole; 4. Electrode seat; 41. Water inlet channel; 42. Water outlet channel; 43. Guide hole one; 5. Insulating seat; 51. Cooling channel four; 6. Nozzle; 61. Nozzle center hole; 7. Electrode; 8. Central water pipe; 9. Distribution ring; 10. Protective gas chamber; 11. Distribution chamber one; 12. Distribution chamber two; 13. Cooling channel one; 14. Distribution chamber four; 16. Electrode cooling chamber; 17. Ion gas flow chamber; 100. Water inlet pipe; 200. Water outlet pipe; 300. Protective gas pipe; 400. Plasma gas pipe. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0032] Please refer to Figures 1 to 7 As shown, the plasma arc cutting torch provided by this utility model will now be described, and will be... Figure 2 The flow path of the coolant is simply illustrated by arrows. Figure 4The flow paths of the protective gas and ion gas are simply illustrated by arrows. This plasma arc cutting torch includes an outer casing 1, a base 2, a protective cap 3, an electrode holder 4, a nozzle 6, and an electrode 7. The base 2, electrode holder 4, nozzle 6, and electrode 7 are all housed and installed inside the outer casing 1. The nozzle 6 is installed at the front end of the base 2. The electrode 7 is installed on the electrode holder 4 and close to the nozzle 6, with its front end extending into the interior of the nozzle 6. The protective cap 3 is fitted over the outside of the nozzle 6. The electrode holder 4 has an inlet channel 41 and an outlet channel 42. A central water pipe 8 is connected to the inlet channel 41, and one end of the central water pipe 8 extends into the inner cavity of the electrode 7. An electrode cooling chamber 16, communicating with the central water pipe 8, is formed between the outer wall of the central water pipe 8 and the inner wall of its inner bore. The base 2 has a second cooling channel 21, which contacts the nozzle 6. A protective air chamber 10 is formed between the outer wall of the nozzle 6 and the inner wall of the protective cap 3. The end of the protective cap 3 is provided with a protective cap center hole 31 that is aligned with the nozzle center hole 61 of the nozzle 6. The protective air chamber 10 is connected to the protective cap center hole 31. The electrode cooling chamber 16 is connected to the second cooling channel 21. The water outlet channel 42 is connected to the second cooling channel 21. Thus, through the above design, the coolant can not only cool the electrode 7 when it enters the electrode cooling chamber 16, but also cool the nozzle 6 when it enters the second cooling channel 21 and contacts the nozzle 6. The coolant can also adhere to the smoke particles generated by plasma arc cutting when it enters the protective air chamber 10 and is sprayed out through the protective cap center hole 31, causing the smoke particles to settle, inhibiting the emission of smoke, reducing harm to the human body, and improving environmental protection.

[0033] In some embodiments, the protective cap 3 is connected and fixed to the outer jacket 1. Specifically, the protective cap 3 is fixed to the outer jacket 1 by a threaded connection. The protective cap 3 can also protect the nozzle 6. In addition, the outer jacket 1 is made of metal, which on the one hand gives the outer jacket 1 excellent mechanical properties to achieve better protection, on the other hand gives the outer jacket 1 excellent thermal conductivity to assist cooling, and on the other hand can improve the aesthetics of the product.

[0034] like Figure 2 As shown, in some embodiments, the plasma arc cutting torch further includes an insulating seat 5, which is disposed between the electrode seat 4 and the base 2.

[0035] In some embodiments, an annular nozzle cooling chamber is formed between the outer walls of the base 2 and the nozzle 6. The nozzle cooling chamber is connected to the cooling channel 21 and the water outlet channel 42, so that the coolant can be discharged from the cooling channel 21 to the nozzle cooling chamber to achieve contact heat exchange with the nozzle 6. At the same time, the coolant in the nozzle cooling chamber can be discharged from the water outlet channel 42 to achieve the circulation and conversion of the coolant.

[0036] like Figure 2As shown, in some embodiments, the base 2 is also provided with a third cooling channel 22 spaced apart from the second cooling channel 21. The third cooling channel 22 communicates with the nozzle cooling chamber. A second distribution chamber 12 is formed between the outer wall of the base 2 and the inner wall of the outer sleeve 1. The second distribution chamber 12 communicates with the protective air chamber 10. The outer wall of the base 2 is provided with a second guide hole 23 communicating between the second cooling channel 21 and the second distribution chamber 12. The outer wall of the base 2 is also provided with a third guide hole 24 communicating between the third cooling channel 22 and the second distribution chamber 12. In this way, the coolant in the second cooling channel 21 can not only enter the nozzle cooling chamber to cool the nozzle 6, but also enter the second distribution chamber 12 to flow to the protective air chamber 10, so that the coolant in the protective air chamber 10 is finally sprayed out from the central hole 31 of the protective cap, realizing the settling of dust particles. Specifically, in this embodiment, the second cooling channel 21 extends along the axial direction of the base 2, and the third cooling channel 22 also extends along the axial direction of the base 2.

[0037] like Figure 3 and Figure 4 As shown, in some embodiments, the plasma arc cutting torch further includes a protective gas pipe 300 for receiving protective gas. The base 2 is provided with a protective gas flow channel 26 that connects to the protective gas pipe 300. The outer wall of the base 2 is provided with a guide hole 27 that connects the protective gas flow channel 26 and the distribution chamber 12. In this way, the protective gas can flow sequentially through the protective gas pipe 300, the protective gas flow channel 26, the guide hole 27, the distribution chamber 12 and the protective gas chamber 10, and finally be sprayed from the center hole 31 of the protective cap. On the one hand, the protective gas mixes with the coolant and is sprayed from the center hole 31 of the protective cap to protect the workpiece from slag splashing. On the other hand, the protective gas can isolate the air and prevent the molten workpiece from oxidizing violently, thereby reducing the loss of the workpiece caused by cutting.

[0038] like Figure 4 As shown, in some embodiments, the plasma arc cutting torch further includes a plasma gas pipe 400 for receiving the ion gas flow. A distribution ring 9 is fitted over the electrode 7. An ion gas flow channel 25 communicating with the plasma gas pipe 400 is provided on the base 2. A distribution cavity 14 is formed between the inner wall of the base 2, the outer wall of the insulating seat 5, and the outer wall of the distribution ring 9. An ion gas flow chamber 17 is formed between the inner wall of the distribution ring 9, the outer wall of the electrode 7, and the inner wall of the nozzle 6. The distribution cavity 14 communicates with the ion gas flow chamber 17, and the ion gas flow chamber 17 communicates with the nozzle center hole 61. Thus, the ion gas flow can sequentially pass through the plasma gas pipe 400, the ion gas flow channel 25, the distribution cavity 14, and the ion gas flow chamber 17, and finally be focused and ejected from the nozzle center hole 61. When the plasma arc cutting torch is working, the electrode 7 is energized to generate an electric arc. The electric arc ionizes the ion gas flow discharged through the ion gas flow chamber 17, achieving the purpose of cutting the workpiece by melting and blowing away the molten metal with the help of high-speed hot ion gas. Figure 5 and Figure 6 As shown, the distribution ring 9 is provided with a homogenization channel 91 and a vortex channel 92 that are connected. The distribution ring 9 is provided with a plurality of homogenization channels 91, which are arranged circumferentially around the distribution ring 9. The end of the homogenization channel 91 facing away from the nozzle 6 is connected to the distribution chamber 14, so that the ion gas flow in the distribution chamber 14 is uniformly split and accelerated when it enters the narrow homogenization channel 91. The distribution ring 9 is provided with a plurality of vortex channels 92, and the end of the vortex channel 92 near the nozzle 6 is connected to the ion gas flow chamber 17, so that the ion gas flow is accelerated by vortex after entering the vortex channel 92 from the homogenization channel 91.

[0039] like Figure 2 and Figure 4 As shown, in some embodiments, the electrode 7 and the electrode seat 4 are connected and fixed by a threaded engagement, and a portion of the electrode 7 extending outside the electrode seat 4 is inserted into the insulating seat 5. A sealing ring for sealing is provided between the electrode 7 and the insulating seat 5.

[0040] like Figure 2 and Figure 4 As shown, in some embodiments, a cooling channel 13 is spaced between the outer wall of the central water pipe 8 and the inner wall of the electrode seat 4. The cooling channel 13 is connected to the water inlet channel 41. A distribution cavity 11 is spaced between the inner wall of the insulating seat 5 and the outer wall of the electrode seat 4. The distribution cavity 11 is connected between the cooling channel 13 and the cooling channel 21. Specifically, the electrode seat 4 is provided with a guide hole 43 that connects the distribution cavity 11 and the cooling channel 13.

[0041] like Figure 2 As shown, in some embodiments, the electrode holder 4 is provided with a cooling channel 51 that connects the water outlet channel 42 and the cooling channel 22.

[0042] like Figure 1 and Figure 2 As shown, in some embodiments, the plasma arc cutting torch further includes an inlet pipe 100 for receiving coolant and an outlet pipe 200 for returning coolant. The inlet pipe 100 is connected to the electrode base 4 and communicates with the inlet channel 41, and the outlet pipe 200 is connected to the electrode base 4 and communicates with the outlet channel 42.

[0043] like Figure 2 As shown, in some embodiments, a hafnium wire is embedded in the end of the electrode 7 near the nozzle 6.

[0044] like Figure 2As shown, in some embodiments, there is a gap between the bottom end of the central water pipe 8 and the bottom wall of the inner cavity of the electrode 7, and a protrusion is provided on the bottom wall of the inner cavity of the electrode 7, which is directly opposite the hafnium wire. This protrusion design can increase the contact surface between the heating end of the electrode 7 and the coolant, thereby improving the heat dissipation performance of the electrode 7.

[0045] like Figure 2 As shown, in some embodiments, one end of the distribution ring 9 abuts against the insulating seat 5, and the other end of the distribution ring 9 abuts against the stepped surface of the inner wall of the nozzle 6.

[0046] Cooling water circuit: The coolant enters the inlet channel 41 of the electrode holder 4 from the inlet pipe 100, and then reaches the electrode cooling chamber 16 through the central water pipe 8 to water cool the electrode 7. Subsequently, it flows through the first cooling channel 13, the first guide hole 43, the first distribution chamber 11, and the second cooling channel 21 to reach the nozzle cooling chamber to water cool the nozzle 6. Then, it flows back to the outlet channel 42 through the third cooling channel 22 and the fourth cooling channel 51, and is discharged from the outlet channel 42 through the outlet pipe 200. At the same time, the coolant also passes through the second cooling channel 21, the second guide hole 23, the second distribution chamber 12, and the protective gas chamber 10 to reach the center hole 31 of the protective cap.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A plasma arc cutting torch, characterized in that: The device includes an outer casing, a base, a protective cap, an electrode holder, a nozzle, and an electrode. The base, electrode holder, nozzle, and electrode are all housed and installed inside the outer casing. The nozzle is installed at the front end of the base. The electrode is installed on the electrode holder and close to the nozzle, with its front end extending into the nozzle. The protective cap is fitted over the outside of the nozzle. The electrode holder has an inlet channel and an outlet channel. A central water pipe is connected to the inlet channel. One end of the central water pipe extends into the inner cavity of the electrode. An electrode cooling chamber, communicating with the central water pipe, is located between the outer wall of the central water pipe and the inner wall of the inner hole. The base has a second cooling channel that contacts the nozzle. A protective air chamber is located between the outer wall of the nozzle and the inner wall of the protective cap. The end of the protective cap has a protective cap center hole aligned with the nozzle center hole. The protective air chamber communicates with the protective cap center hole. The electrode cooling chamber communicates with the second cooling channel. The outlet channel communicates with the second cooling channel.

2. The plasma arc cutting torch according to claim 1, characterized in that: The plasma arc cutting torch also includes an insulating base, which is disposed between the electrode base and the base.

3. The plasma arc cutting torch according to claim 1, characterized in that: An annular nozzle cooling chamber is formed between the outer wall of the base and the nozzle, and the nozzle cooling chamber is connected to the cooling channel and the water outlet channel.

4. The plasma arc cutting torch according to claim 3, characterized in that: The base is also provided with a cooling channel three that is spaced apart from the cooling channel two. The cooling channel three is connected to the nozzle cooling chamber. A distribution chamber two is provided between the outer wall of the base and the inner wall of the outer sleeve. The distribution chamber two is connected to the protective gas chamber. A guide hole two is provided on the outer wall of the base that connects the cooling channel two and the distribution chamber two. A guide hole three is also provided on the outer wall of the base that connects the cooling channel three and the distribution chamber two.

5. The plasma arc cutting torch according to claim 4, characterized in that: The plasma arc cutting torch also includes a protective gas pipe for receiving protective gas. The base is provided with a protective gas flow channel that connects to the protective gas pipe, and the outer wall of the base is provided with a guide hole four that connects the protective gas flow channel and the distribution chamber two.

6. The plasma arc cutting torch according to claim 2, characterized in that: The plasma arc cutting torch also includes a plasma pipe for receiving ion gas flow. The electrode is fitted with a distribution ring, and the base is provided with an ion gas flow channel that connects to the plasma pipe. A distribution cavity four is provided between the inner wall of the base, the outer wall of the insulating seat, and the outer wall of the distribution ring. An ion gas flow chamber is provided between the inner wall of the distribution ring, the outer wall of the electrode, and the inner wall of the nozzle. The distribution cavity four is connected to the ion gas flow chamber, and the ion gas flow chamber is connected to the central hole of the nozzle.

7. The plasma arc cutting torch according to claim 6, characterized in that: The distribution ring is provided with a homogenization channel and a vortex channel that are connected to each other. The distribution ring is provided with multiple homogenization channels that are circumferentially spaced around the distribution ring. The end of the homogenization channel away from the nozzle is connected to the distribution chamber. The distribution ring is provided with multiple vortex channels, and the end of the vortex channel near the nozzle is connected to the ion flow chamber.

8. The plasma arc cutting torch according to claim 2, characterized in that: A cooling channel 1 is provided between the outer wall of the central water pipe and the inner wall of the electrode holder. The cooling channel 1 is connected to the water inlet channel. A distribution cavity 1 is provided between the inner wall of the insulating seat and the outer wall of the electrode holder. The distribution cavity 1 is connected between the cooling channel 1 and the cooling channel 2.

9. The plasma arc cutting torch according to claim 1, characterized in that: The plasma arc cutting torch also includes an inlet pipe for receiving coolant and an outlet pipe for returning coolant. The inlet pipe is connected to the electrode base and communicates with the inlet channel, and the outlet pipe is connected to the electrode base and communicates with the outlet channel.

10. The plasma arc cutting torch according to claim 6, characterized in that: One end of the distribution ring rests against the insulating base, and the other end of the distribution ring rests against the stepped surface of the inner wall of the nozzle.

Images