Liquid-cooled plasma arc torch

Abstract

The utility model discloses a liquid cooling plasma arc torch, which belongs to the technical field of plasma arc torches and comprises a sleeve and an electrode inserted into the sleeve, a cooling sleeve is sleeved outside the electrode, a first flow guide body and a second flow guide body which are vertically arranged are arranged between the electrode and the cooling sleeve, the cooling sleeve is of a hollow structure, and the bottom end of the cooling sleeve is open. A heat exchange sleeve is slidably connected into the cooling sleeve. The device can provide liquid cooling for the electrode, is also provided with a structure for rectifying combustible gas entering the plasma torch, is free of environmental pollution, can prolong the service life of the electrode, and is simple in structure and easy to manufacture.

Description

Technical Field

[0001] The utility model relates to the technical field of plasma arc torches, in particular to a liquid-cooled plasma arc torch. Background Art

[0002] A liquid-cooled plasma arc torch is a device used for processing materials at high temperatures. It cools the plasma arc torch through a liquid coolant tube to maintain the normal operating temperature of the cutting torch electrode. The design of the liquid coolant tube generally includes a hollow elongated main body and a hollow elongated external body, wherein the internal body is fixedly connected to the plasma cutting torch, and the external body includes a set of electrode guides for guiding and conveying the coolant flow. During operation, the plasma arc cutting machine uses the internal coolant convection of the equipment to quickly remove the huge heat generated by the cutting torch from the flowing coolant to ensure the normal operating temperature of the cutting torch electrode. However, the cost of special coolant is expensive, the installation and maintenance of the cooling system is relatively complicated, the equipment is not easy to clean, and the handling and discharge of the coolant may burden the environment.

[0003] There are solutions in the prior art that use liquid to cool plasma arc torches. For example, patent CN200780006389.9 discloses a liquid-cooled plasma arc torch. The technical solution in this patent is a transferred arc plasma torch having a sleeve cooled by a cooling fluid and an electrode inserted into the sleeve, wherein the electrode is made of a consumable material, and the plasma torch has a device for supplying an electrode made of the electrode material to compensate for corrosion of the electrode. This patent still has room for improvement in the cooling solution.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a liquid-cooled plasma arc torch, which can provide liquid cooling for the electrode and is also provided with a structure for rectifying the combustible gas entering the plasma torch. It has no environmental pollution and extends the service life of the electrode. The device has a simple structure and is easy to manufacture.

[0006] In order to solve the above technical problems, the utility model specifically provides the following technical solutions:

[0007] A liquid-cooled plasma arc torch comprises a sleeve and an electrode inserted into the sleeve, a cooling sleeve is sleeved on the outer side of the electrode, a first flow guide and a second flow guide arranged up and down are arranged between the electrode and the cooling sleeve, the cooling sleeve is a hollow structure with an opening at the bottom, and a heat exchange sleeve is slidably connected inside the cooling sleeve.

[0008] According to one embodiment of the utility model, the heat exchange sleeve is a tube sleeve-like structure with openings at both ends and an annular through groove on the side. The annular through groove divides the heat exchange sleeve into a number of sub-annular sleeves with upper and lower through holes with a certain gap and hollow inside. Square through holes are also regularly provided on the sides of the top and bottom structures of the heat exchange sleeve. This structure can increase the contact area between the cooling liquid and the heat exchange sleeve, and more efficiently exchange liquid heat, and also has a certain lightweight effect. A vertical strip structure is provided on the side of the heat exchange sleeve, which vertically penetrates the side wall of the heat exchange sleeve and is used to connect and fix the heat exchange sleeve. A vertical sheet body is provided on the opposite side of the vertical strip structure, which vertically penetrates the side wall of the heat exchange sleeve and is used to further enhance the strength and stability of the heat exchange sleeve, and ensure that the heat exchange sleeve will not deform or break under working pressure.

[0009] According to one embodiment of the utility model, an inlet and outlet pipe connected to the interior of the cooling jacket is provided on the side of the cooling jacket, and the inlet and outlet pipe includes a water inlet pipe and a water outlet pipe for supplying and recovering cooling liquid.

[0010] According to one embodiment of the utility model, a spring is arranged around the end of the heat exchange jacket for pulling back the heat exchange jacket, a threaded structure matching the threaded hole on the bottom surface of the mounting base is arranged on the side of the spring close to the mounting base, threads and threaded holes are arranged on the bottom surface of the mounting base, the spring is connected to the threaded hole on the bottom surface of the mounting base, the mounting base is located on the top of the cooling jacket, the heat exchange jacket is installed inside the cooling jacket, a threaded structure is also arranged on the top of the cooling jacket, and the cooling jacket can be screwed into the threads of the mounting base.

[0011] According to one embodiment of the utility model, a pair of high-temperature heat-resistant rubber strips are provided at the opening portion at the bottom end of the cooling jacket, which are used to seal the cooling jacket to ensure that the cooling liquid does not leak out during operation. When the cooling liquid enters from the inlet and outlet pipes, the heat exchange jacket inside the cooling jacket moves in the opposite direction to the mounting base under the action of the cooling liquid pressure, and the spring connected to the bottom of the mounting base at the top of the heat exchange jacket will be stretched, and then the heat exchange jacket will be pushed out from between the high-temperature heat-resistant rubber strips. In the process of the heat exchange jacket being pushed out, a part of the high-temperature cooling liquid will be brought out, and this part of the high-temperature cooling liquid will be quickly evaporated, and the pushed-out heat exchange jacket will also naturally cool down in the air, and the pushed-out part of the heat exchange jacket will also serve as a protective device to limit the range of the plasma torch.

[0012] According to one embodiment of the utility model, after the heat exchange jacket is pushed out, the cooling liquid inside the cooling jacket will flow and exchange at an extremely fast flow rate, thereby taking away the heat emitted by the electrode more quickly. When the pressure of the cooling liquid entering from the inlet and outlet pipes decreases, the heat exchange jacket will be gradually pulled back into the cooling jacket under the tension of the spring at its top end. When the heat exchange jacket completely enters the cooling jacket, the high-temperature and heat-resistant rubber strip at the opening part of the bottom end of the cooling jacket will close to play its sealing role. The pressure of the cooling liquid entering the cooling jacket can be controlled by relevant technical personnel. When the temperature of the plasma torch is too high, the pressure of the cooling liquid entering the cooling jacket can be increased to achieve a rapid cooling effect.

[0013] According to one embodiment of the utility model, the first guide body includes a metal sleeve sleeved on the electrode and guide vanes connected to the metal sleeve, the guide vanes are located between the inner surface of the cooling sleeve and the metal sleeve, the guide vanes are curved sheet structures and are obliquely arranged on the outer surface of the metal sleeve, this structure can make the combustible gas entering the plasma torch be rectified when passing around the electrode, and form a vortex, so as to improve the gas utilization rate and gas outlet smoothness, and the vortex gas also helps to use the vortex thrust to remove possible adhesions on the electrode surface.

[0014] According to one embodiment of the utility model, the second flow guide sleeve is arranged on the outside of the electrode, between the inner surface of the cooling sleeve and the metal sleeve, the second flow guide is an internally hollow upper and lower layered annular structure, including a first plate body and a second plate body, the first plate body and the second plate body are connected by a support plate, the support plate is a square sheet structure and is vertically and obliquely arranged between the first plate body and the second plate body, the structure divides the hollow cavity inside the second flow guide into small cavities interconnected with each other, and can divert and reduce the pressure of the gas flowing through, avoid the exhaust gas in one impact direction, and further avoid the excessive pressure of the discharged high-temperature gas.

[0015] According to one embodiment of the utility model, semicircular notches are evenly arranged on the edges of the first plate body and the second plate body, and corresponding annular holes are opened on the first plate body and the second plate body for gas to flow through, so that the high-temperature gas inside the plasma torch can be discharged from multiple outlets, avoiding the use of one air hole causing excessive local gas pressure. This structure cooperates with the support plate between the first plate body and the second plate body, and has a good pressure relief effect.

[0016] According to one embodiment of the utility model, a threaded structure is provided at a contact portion between the second fluid conductor and the electrode, and a threaded structure is also provided at a contact portion between the electrode and the second fluid conductor to match the threaded structure. The two threaded structures cooperate to set the second fluid conductor at the end of the electrode and limit the movement of the second fluid conductor. A vertical block structure connected to and tangent to the first plate body and the second plate body is also provided on the side of the second fluid conductor. The structure can fix the first plate body and the second plate body so that the relative position of the first plate body and the second plate body remains unchanged, and strengthen the structural strength of the second fluid conductor to increase its service life.

[0017] According to an embodiment of the utility model, the coaxiality of the heat exchange sleeve and the electrode is made consistent through the second flow guide, and the adjacent spacing between the heat exchange sleeve and the electrode is controlled within a consistent range, so that the uniformity of heat exchange is guaranteed. In addition, the second flow guide is arranged at the end of the electrode, which has a certain shielding effect on the entry of foreign impurities into the electrode. If the debris on the electrode falls, the airflow that continues to flow in the direction of the second flow guide can easily discharge the debris from the annular holes on the first and second plates and the semicircular notches on the edges of the first and second plates.

[0018] The cooling liquid includes but is not limited to pure water.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model dissipates heat through a heat exchange sleeve, thereby improving the heat dissipation efficiency of the plasma torch. When the temperature of the plasma torch is too high, the heat exchange sleeve extends the cooling sleeve under the pressure of the cooling liquid entering from the inlet and outlet pipes, thereby limiting the range of the plasma torch while dissipating heat and ensuring the safety of the equipment. When pure water is used as a cooling liquid, it can be recycled to reduce resource waste and avoid environmental pollution. The presence of the first flow conductor and the second flow conductor can rectify the combustible gas in the electrode part, change the gas flow direction, and avoid high-temperature gas from spraying directly in one direction. At the same time, the swirling gas generated after rectification can also remove possible adhesions on the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the liquid-cooled plasma arc torch scheme of the utility model;

[0023] Figure 2 This is a schematic diagram of the matching scheme of the installation base and the cooling jacket of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the heat exchange jacket of the utility model;

[0025] Figure 4 It is a schematic diagram of the matching scheme of the cooling jacket, the heat exchange jacket and the first flow guide body of the utility model;

[0026] Figure 5This is a schematic diagram of the structure of the second body guide of the utility model.

[0027] Figure numbers: 100-sleeve; 10-cooling jacket; 101-electrode; 102-inlet and outlet pipes; 103-mounting base; 20-heat exchange jacket; 30-first guide body; 301-metal jacket; 302-guide blades; 40-second guide body; 401-first plate body; 402-second plate body; 403-annular hole; 404-support plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0030] Example 1

[0031] The liquid-cooled plasma arc torch provided by the utility model comprises a sleeve 100 and an electrode 101 inserted into the sleeve 100, a cooling sleeve 10 is sleeved on the outer side of the electrode 101, a first flow guide 30 and a second flow guide 40 arranged up and down are provided between the electrode 101 and the cooling sleeve 10, the cooling sleeve 10 is a hollow structure with an opening at the bottom, and a heat exchange sleeve 20 is slidably connected inside the cooling sleeve 10.

[0032] The heat exchange sleeve 20 is a tube sleeve structure with openings at both ends and an annular groove on the side. The annular groove divides the heat exchange sleeve 20 into a number of sub-annular sleeves with upper and lower through holes with a certain gap and hollow inside. The top and bottom structure sides of the heat exchange sleeve 20 are also regularly provided with square through holes. This structure can increase the contact area between the cooling liquid and the heat exchange sleeve, more efficiently exchange liquid heat, and also has a certain lightweight effect. A vertical strip structure vertically penetrating the side wall of the heat exchange sleeve 20 is provided on the side of the heat exchange sleeve 20 for connecting and fixing the heat exchange sleeve 20. A vertical sheet body vertically penetrating the side wall of the heat exchange sleeve 20 is provided on the opposite side of the vertical strip structure to further enhance the strength and stability of the heat exchange sleeve 20, and ensure that the heat exchange sleeve 20 will not deform or break under working pressure.

[0033] An inlet and outlet pipe 102 connected to the interior of the cooling jacket 10 is provided on the side of the cooling jacket 10. The inlet and outlet pipe 102 includes a water inlet pipe and a water outlet pipe for supplying and recovering cooling liquid.

[0034] A spring is arranged around the end of the heat exchange jacket 20 for pulling back the heat exchange jacket 20. A threaded structure matching the threaded hole on the bottom surface of the mounting base 103 is arranged on the side of the spring close to the mounting base 103. Threads and threaded holes are arranged on the bottom surface of the mounting base 103. The spring is connected to the threaded hole on the bottom surface of the mounting base 103. The mounting base 103 is located on the top of the cooling jacket 10. The heat exchange jacket 20 is installed inside the cooling jacket 10. A threaded structure is also arranged on the top of the cooling jacket 10, and the cooling jacket 10 can be screwed into the thread of the mounting base 103.

[0035] A pair of high-temperature heat-resistant rubber strips are provided at the opening portion at the bottom end of the cooling jacket 10, which are used to seal the cooling jacket 10 to ensure that the cooling liquid does not leak out during operation. When the cooling liquid enters from the inlet and outlet pipes 102, the heat exchange jacket 20 inside the cooling jacket 10 moves in the opposite direction of the mounting base 103 under the action of the cooling liquid pressure, and the spring at the top of the heat exchange jacket 20 connected to the bottom of the mounting base 103 will be stretched, and then the heat exchange jacket 20 will be pushed out from between the high-temperature heat-resistant rubber strips. In the process of the heat exchange jacket 20 being pushed out, a part of the high-temperature cooling liquid will be brought out, and this part of the high-temperature cooling liquid will be quickly evaporated, and the pushed-out heat exchange jacket 20 will also naturally cool down in the air, and the pushed-out part of the heat exchange jacket 20 will also serve as a protective device to limit the range of the plasma torch.

[0036] After the heat exchange sleeve 20 is pushed out, the cooling liquid inside the cooling sleeve 10 will flow and exchange at an extremely fast flow rate, thereby taking away the heat emitted by the electrode 101 more quickly. When the pressure of the cooling liquid entering from the inlet and outlet pipes 102 decreases, the heat exchange sleeve 20 will be gradually pulled back into the cooling sleeve 10 under the tension of the spring at its top end. When the heat exchange sleeve 20 completely enters the cooling sleeve 10, the high-temperature heat-resistant rubber strip at the opening at the bottom end of the cooling sleeve 10 will close to play its sealing role. The pressure of the cooling liquid entering the cooling sleeve 10 can be controlled by relevant technical personnel. When the temperature of the plasma torch is too high, the pressure of the cooling liquid entering the cooling sleeve 10 can be increased to achieve a rapid cooling effect.

[0037] The first flow guide 30 includes a metal sleeve 301 sleeved on the electrode 101 and guide blades 302 connected to the metal sleeve 301. The guide blades 302 are located between the inner surface of the cooling sleeve 10 and the metal sleeve 301. The guide blades 302 are curved sheet structures and are obliquely arranged on the outer surface of the metal sleeve 301. This structure can make the combustible gas entering the plasma torch be rectified when passing around the electrode 101 and form a vortex, thereby improving the gas utilization rate and gas outlet smoothness, and the vortex gas also helps to use the vortex thrust to remove possible adhesions on the surface of the electrode 101.

[0038] The second flow guide 40 is sleeved on the outside of the electrode 101 and is located between the inner surface of the cooling sleeve 10 and the metal sleeve 301. The second flow guide 40 is an internally hollow upper and lower layered annular structure, including a first plate body 401 and a second plate body 402. The first plate body 401 and the second plate body 402 are connected by a support plate 404. The support plate 404 is a square sheet structure and is vertically and obliquely arranged between the first plate body 401 and the second plate body 402. This structure divides the hollow cavity inside the second flow guide 40 into small cavities that are interconnected, which can divert and reduce the pressure of the gas flowing through, avoid the exhaust gas from having an impact direction, and further avoid excessive pressure of the discharged high-temperature gas.

[0039] Semicircular notches are evenly arranged on the edges of the first plate body 401 and the second plate body 402, and corresponding annular holes 403 are opened on the first plate body 401 and the second plate body 402 for gas to flow through, so that the high-temperature gas inside the plasma torch can be discharged from multiple outlets, avoiding the use of one air hole causing excessive local gas pressure. This structure cooperates with the support plate 404 between the first plate body 401 and the second plate body 402, and has a good pressure relief effect.

[0040] The contact portion between the second flow conductor 40 and the electrode 101 is provided with a threaded structure, and the contact portion between the electrode 101 and the second flow conductor 40 is also provided with a threaded structure matching therewith. The two threaded structures cooperate to set the second flow conductor 40 at the end of the electrode 101 and limit the movement of the second flow conductor 40. The side of the second flow conductor 40 is also provided with a vertical block structure connected to and tangent to the first plate body 401 and the second plate body 402. The structure can fix the first plate body 401 and the second plate body 402, so that the relative position of the first plate body 401 and the second plate body 402 remains unchanged, and strengthen the structural strength of the second flow conductor 40 to increase its service life.

[0041] The second flow guide 40 is used to make the coaxiality of the heat exchange sleeve 20 and the electrode 101 consistent, and the adjacent spacing between the heat exchange sleeve 20 and the electrode 101 is controlled within a consistent range, so that the heat exchange uniformity is guaranteed. In addition, the second flow guide 40 is arranged at the end of the electrode 101, which has a certain shielding effect on the external impurities entering the electrode 101. If the debris on the electrode 101 falls, under the action of the airflow that continues to flow in the direction of the second flow guide 40, the debris can be easily discharged from the annular holes 403 on the first plate body 401 and the second plate body 402 and the semicircular notches on the edges of the first plate body 401 and the second plate body 402.

[0042] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the utility model, and are not intended to limit the implementation methods of the technology of the utility model in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the utility model, but they should still be regarded as technologies or embodiments that are essentially the same as the utility model.

[0043] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A liquid-cooled plasma arc torch, comprising a sleeve (100), and an electrode (101) inserted into the sleeve (100), Features: A cooling jacket (10) is provided on the outer side of the electrode (101), a first flow guide (30) and a second flow guide (40) arranged vertically are provided between the electrode (101) and the cooling jacket (10), the cooling jacket (10) is a hollow structure with an open bottom, and a heat exchange jacket (20) is slidably connected to the interior of the cooling jacket (10).

2. A liquid-cooled plasma arc torch according to claim 1, characterized in that: The heat exchange jacket (20) is a tube-shaped structure with openings at both ends and an annular through groove on the side surface; the top and bottom structure sides of the heat exchange jacket (20) are provided with square through holes in array; the side surface of the heat exchange jacket (20) is provided with a vertical strip structure vertically penetrating the side wall of the heat exchange jacket (20); and a vertical sheet body vertically penetrating the side wall of the heat exchange jacket (20) is provided on the opposite side of the vertical strip structure.

3. A liquid-cooled plasma arc torch according to claim 2, characterized in that: A spring is provided around the end of the heat exchange jacket (20), the spring is connected to the bottom surface of the mounting base (103), the mounting base (103) is located on the top of the cooling jacket (10), a threaded hole is provided on the bottom surface of the mounting base (103), and the cooling jacket (10) is threadedly connected to the mounting base (103).

4. A liquid-cooled plasma arc torch according to claim 1, characterized in that: An inlet and outlet pipe (102) connected to the interior of the cooling jacket (10) is provided on the side of the cooling jacket (10).

5. A liquid-cooled plasma arc torch according to claim 1, characterized in that: The first flow guide (30) comprises a metal sleeve (301) sleeved on the electrode (101) and a flow guide vane (302) connected to the metal sleeve (301); the flow guide vane (302) is a curved sheet structure and is obliquely arranged on the outer surface of the metal sleeve (301); the flow guide vane (302) is located between the inner surface of the cooling sleeve (10) and the metal sleeve (301).

6. A liquid-cooled plasma arc torch according to claim 5, characterized in that: The second flow guide (40) is sleeved on the outside of the electrode (101), the second flow guide (40) is located between the inner surface of the cooling sleeve (10) and the metal sleeve (301), the second flow guide (40) is an upper and lower layered annular structure with a hollow interior, the second flow guide (40) comprises a first plate body (401) and a second plate body (402), and semicircular notches are evenly arranged on the edges of the first plate body (401) and the second plate body (402).

7. A liquid-cooled plasma arc torch according to claim 6, characterized in that: The first plate body (401) and the second plate body (402) are connected via a support plate (404); the support plate (404) is a square sheet structure and is vertically and obliquely arranged between the first plate body (401) and the second plate body (402).

8. A liquid-cooled plasma arc torch according to claim 7, characterized in that: A vertical block structure connected to and tangent to the first plate body (401) and the second plate body (402) is also provided on the side of the second flow guide (40), and annular holes (403) are correspondingly provided on the first plate body (401) and the second plate body (402).

9. A liquid-cooled plasma arc torch according to claim 8, characterized in that: The second flow conductor (40) is arranged at the end of the electrode (101).

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