A plasma torch jet device

Abstract

The utility model discloses a kind of plasma torch jet device, including jet pipe body, flange seat, control ring and adjustable valve group, the jet pipe body inner cavity constitutes contraction-throat-expansion type venturi passage;The adjustable valve group is set between throat pipe section and injection end, is composed of static guide ring, moving ring and multiple valve leaves, each valve leaf is slidably connected by guide groove and sliding sleeve groove, it is symmetrically arranged around central axis, and can be opened and closed synchronously under the drive of control ring, realize the continuous regulation of throat aperture. The structure uses iris mechanism adjustment principle, combines venturi acceleration effect, realizes the dynamic regulation and control to plasma jet speed and energy distribution, effectively improves cutting efficiency and jet stability, and is suitable for multi-working condition plasma processing application.

Description

Technical Field

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

[0002] Plasma cutting, a highly efficient thermal processing technology that utilizes high-temperature, high-speed plasma gas flow to melt and blow away metal materials, is widely used in heavy industry, metal manufacturing, automotive, and aerospace fields. The plasma torch, as the core execution unit, has a direct impact on cutting efficiency, jet stability, and energy utilization due to its jet channel structure.

[0003] In existing technologies, common plasma torch nozzle structures typically employ a fixed-diameter Venturi jet channel, whose internal flow path includes a contraction section, a throat section, and an expansion section. The throat section has fixed geometric dimensions, and the airflow velocity is adjusted solely by the inlet pressure, making dynamic cross-sectional control impossible. This results in difficulty matching the jet velocity and energy density under different operating conditions, particularly when cutting materials of varying materials or thicknesses, leading to problems such as adjustment lag, uneven cutting surfaces, and high energy consumption.

[0004] To improve jet performance, some technologies have attempted to introduce multi-stage gas channels or replaceable nozzle structures, but these are often complex in structure and slow in response, making them unsuitable for dynamic control. Other solutions use solenoid valves to control the flow rate distribution of multiple gas channels, but their adjustment accuracy is limited and their cost is high, which is not conducive to widespread adoption.

[0005] In addition, existing adjustable nozzle structures generally suffer from small adjustment range and poor coordination of mechanical components. In some structures, the adjustment mechanism is located outside the nozzle, which cannot be integrated into the standard torch system due to volume and space limitations. Furthermore, the structure has poor sealing, which leads to increased airflow disturbance and insufficient jet focusing performance, affecting cutting quality and equipment lifespan.

[0006] In summary, existing plasma torch jet devices still have significant shortcomings in terms of nozzle channel adjustability, structural compactness, and jet stability. There is an urgent need for an improved jet control structure with high structural adjustability, fast response, good jet shaping, and energy-saving effect. Utility Model Content

[0007] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0008] Therefore, the technical solution adopted by this utility model is as follows: a plasma torch jet device, including a jet tube body, a flange seat, a control ring, and an adjustable valve group set in the throat region. The adjustable valve group consists of a static guide ring, a dynamic ring, and multiple controllable and synchronously opening and closing valve leaves. It has the significant characteristics of simple structure, flexible response, and high control precision. It can dynamically adjust the throat diameter of the jet channel according to the working requirements and adapt to plasma jetting scenarios with different materials, thicknesses, and speed requirements.

[0009] In a preferred example, the jet tube includes a jet end, an air inlet section, and a throat section. The internal channel structure formed by the three sections is a contraction-throat-expansion Venturi-shaped airway structure, which can drive the airflow in the throat section through pressure difference to produce an accelerated jet effect. The air inlet section is provided with a flange seat for overall installation and connection with the gas channel to ensure sealing and disassembly.

[0010] In a preferred embodiment, the adjustable valve assembly is disposed between the throat section and the injection end, including a stationary guide ring fixed to the inner wall of the jet pipe, the stationary guide ring having a plurality of guide grooves circumferentially provided; it also includes a rotating ring that can rotate around an axis, the inner circumference of which has a sliding sleeve groove structure for cooperating to drive the movement of multiple valve blades disposed in the stationary guide ring; the multiple valve blades are arranged circumferentially along the central axis, each slidingly engaged with the guide grooves by sliding pins, and a convex sliding block is provided on the back side to cooperate with the sliding sleeve groove, forming a linkage adjustment mechanism.

[0011] In a preferred example, the control ring is rotatably disposed on the outside of the flange seat, and its inner side is fixedly connected to the outer periphery of the moving ring through a pin rod penetrating the outer shell of the throat section. The control ring can be rotated manually or automatically, driving the moving ring to achieve synchronous adjustment of all valve leaves and complete the continuous variable control of the center orifice. The specific adjustment structure is simple to match, reliable in transmission, and fast in response.

[0012] In a preferred example, the valve leaf is designed to be tapered and gradually thinner, with its two sides narrowing from the outer edge to the center and the thickness gradually decreasing. When closed, the two sides overlap to form a complete cone opening, thereby forming a stable tapered airflow guide. This structure can effectively avoid fluid disturbance caused by conventional structural seams, ensuring the symmetry and focusing of the jet airflow, and is particularly suitable for high-precision plasma cutting scenarios.

[0013] In a preferred example, the number of valve blades is no less than 6, forming a uniformly distributed symmetrical structure to ensure the integrity of the jet center hole shape, the continuity of the diameter change process, and the linearity of airflow control.

[0014] In a preferred embodiment, both the stationary guide ring and the rotating ring are coaxial ring structures, and are respectively installed and fixed to the inner wall between the throat section and the injection end by means of a slot or thread, which facilitates maintenance and replacement and ensures assembly stability and airtightness.

[0015] In a preferred example, the valve leaf is connected to the guide groove by a sliding pin and is embedded in the sliding sleeve groove in the moving ring by a convex sliding block on its back. During the rotation of the moving ring, it slides along the spiral guide trajectory, driving all valve leaves to perform synchronous opening and closing actions, thereby realizing real-time adjustment and dynamic control of the central throat opening.

[0016] Specifically, the structure enables the linkage adjustment of the plasma jet outlet gas velocity and cross-sectional dimensions, allowing the plasma energy density, heat distribution, and effective range to be precisely set according to cutting requirements, thereby improving cutting quality and equipment adaptability. At the same time, the conical guide structure significantly improves the jet disturbance problem, extends the nozzle service life, and enhances the overall system thermal efficiency and process stability.

[0017] In summary, the plasma torch jet device proposed in this invention achieves dynamic, efficient, and controllable jet structure adjustment capabilities by integrating a Venturi channel and a multi-plate iris adjustment mechanism, and has significant practical value and engineering application prospects in the field of plasma processing equipment.

[0018] The beneficial effects achieved by this utility model are as follows: 1. In this invention, by introducing a multi-bladed adjustable valve mechanism combined with a Venturi jet structure, the airflow control precision is improved to a continuously adjustable state. An external control ring drives the rotating ring to rotate, thereby driving each valve blade to open and close synchronously along the guide rail. This dynamically adjusts the effective diameter of the minimum jet channel in the throat, enabling flexible matching of plasma jet velocity, density, and cross-sectional shape under different operating conditions, thus improving cutting efficiency and energy utilization.

[0019] 2. In this utility model, each valve leaf adopts a tapered and gradually thinning design, which can form a tapered nozzle with uniform structural transition and good symmetrical guidance in the closed state. This avoids the airflow disturbance, turbulence and focus divergence problems caused by traditional vertical end face adjustment mechanisms, effectively improving the focusing performance and process consistency of plasma jets. The device has a compact structure, sensitive response, and is easy to integrate into existing torch systems, with good industrial adaptability and engineering promotion prospects. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model; Figure 2 This is a cross-sectional structural diagram of one embodiment of the present invention; Figure 3 This is an exploded view of an adjustable valve assembly according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the surface structure of the stationary guide ring and valve blade according to an embodiment of the present invention; Figure 5This is a schematic diagram of the valve leaf structure according to an embodiment of the present invention.

[0021] Figure label: 100. Jet tube body; 110. Flange seat; 120. Control ring; 101. Injection end; 102. Inlet section; 103. Throat section; 200. Adjustable valve assembly; 210. Stationary guide ring; 220. Dynamic ring; 230. Valve leaf; 211. Guide groove; 221. Sliding sleeve groove; 231. Sliding pin; 232. Convex sliding block. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0023] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0024] The following describes, with reference to the accompanying drawings, some embodiments of a plasma torch jet device provided by this utility model.

[0025] Combination Figures 1-5 As shown, the present invention provides a plasma torch jet device, including a jet tube body 100, a flange seat 110, a control ring 120, and an adjustable valve group 200.

[0026] The jet tube 100 is an integrally formed hollow tubular structure, with one end being the jet end 101 and the other end being the air inlet section 102. A throat section 103 connects the two. The internal cavity of the jet tube 100 forms a contraction-throat-expansion venturi channel structure from the air inlet section 102 to the jet end 101, which is used to accelerate, depressurize and stabilize the flow of the working gas, providing the high-speed jet required for the operation of the plasma torch.

[0027] The flange seat 110 is located outside the air inlet section 102 and is connected to the jet tube body 100 by screwing or welding. It is used to install the entire device on the main body of the plasma torch equipment to achieve airflow sealing and stable support of the mechanism.

[0028] The control ring 120 is rotatably mounted outside the flange seat 110. Its circumferential rotation controls the opening and closing angle of the valve leaflet, thereby dynamically adjusting the diameter of the jet stream at the throat. A pin passes through the housing of the throat section 103 on the inner side of the control ring 120. The pin is fixedly connected to the outer circumference of the moving ring 220, thus enabling synchronous rotation and linkage between the control ring 120 and the moving ring 220.

[0029] The adjustable valve assembly 200 is located in the connection area between the throat section 103 and the injection end 101, and is used to continuously adjust the minimum throat cross-sectional orifice diameter. Its specific structure includes a stationary guide ring 210, a moving ring 220, and several valve vanes 230. The stationary guide ring 210 is fixedly installed on the inner wall of the jet tube body 100 and positioned by a snap-fit ​​or threaded structure. The inner ring surface of the stationary guide ring 210 has several guide grooves 211 along the circumferential direction, each guide groove 211 guiding the valve vanes 230 to move axially and radially.

[0030] Specifically, the jet tube 100 includes a jet end 101, an air inlet section 102, and a throat section 103. The inner cavity of the jet tube 100 forms a contraction-throat-expansion Venturi channel. The flange seat 110 is connected to the outside of the air inlet section 102 and is used for overall installation and fixation. The control ring 120 is rotatably mounted on the flange seat 110.

[0031] The moving ring 220 is a concentric ring structure, disposed in the annular cavity between the stationary guide ring 210 and the jet tube body 100. Its inner circumferential surface is provided with multiple sliding sleeve grooves 221, each corresponding to a guide groove 211. The moving ring 220 is synchronously rotated and connected to the control ring 120 via a pin.

[0032] The valve blades 230 are a plurality of independent blade structures, preferably with a number of no less than six blades, each valve blade 230 being distributed at equal angles around the central axis. In practical applications, the number of valve blades 230 can be increased according to the requirements of jet flow control accuracy. Each valve blade 230 is slidably engaged with the guide groove 211 on the stationary guide ring 210 via a sliding pin 231, and is simultaneously inserted into the sliding sleeve groove 221 of the moving ring 220 via a convex sliding block 232 located on its back side. The rotation of the control ring 120 drives the moving ring 220 to rotate, thereby guiding all valve blades 230 to open and close synchronously through the sliding groove trajectory, thus realizing continuous adjustment of the diameter of the central throat.

[0033] like Figure 4 and Figure 5 As shown, the body of the valve blade 230 is wedge-shaped and tapered, with its two sides gradually narrowing towards the center and its thickness gradually decreasing along the radial direction. Multiple valve blades 230 are joined together in the closed state and form a continuous conical jet guide around the center, which effectively avoids sharp flow field disturbances caused by end face seams, realizes smooth gas compression and transition, and enhances jet stability and symmetry.

[0034] Specifically, the adjustable valve assembly 200 is located at the junction of the throat section 103 and the injection end 101, and includes: a stationary guide ring 210, which is fixedly installed on the inner wall of the jet tube body 100, and the stationary guide ring 210 is provided with a plurality of guide grooves 211; a moving ring 220, which rotates synchronously with the control ring 120, and the moving ring 220 is provided with a plurality of sliding sleeve grooves 221; and a plurality of valve blades 230, which are slidably connected to the guide grooves 211 and the sliding sleeve grooves 221 respectively through sliding pins 231 and convex sliding blocks 232, so that the plurality of valve blades 230 are concentrically arranged around the central axis and can open and close synchronously to form an adjustable throat orifice diameter.

[0035] The valve leaflets 230 are not less than 6 in number, and each valve leaflet is engaged with each other in the closed state and arranged in a circular pattern to form a continuously variable orifice. The control ring 120 has a pin that penetrates the surface of the throat section 103 on its inner side, and the pin is fixedly connected to the outer periphery of the moving ring 220. The control ring 120 is driven by an external drive mechanism and can be rotated manually or automatically to synchronously adjust the opening and closing angle of the valve leaf 230. The throat section 103 is the fluid acceleration channel with the smallest diameter in the middle, and together with the adjustable diameter of the adjustable valve group 200, it forms the smallest cross-section of the Venturi jet channel.

[0036] The stationary guide ring 210 and the moving ring 220 are both concentric ring structures, and are respectively installed at the junction of the throat section 103 and the injection end 101 by threaded connection or slot positioning. The valve leaf 230 is connected to the sliding pin 231 by an integral hinge structure, and the convex sliding block 232 slides along an arc trajectory in the sliding sleeve groove 221 to achieve synchronous opening and closing.

[0037] In practical use, the gas enters from the inlet section 102, flows through the venturi-shaped channel, and forms a high-speed and stable jet under the adjustment of the adjustable valve group 200. The diameter of the outlet jet can be dynamically adjusted according to the cutting material or thickness requirements, thereby improving the working efficiency, cutting quality and application adaptability of the plasma torch.

[0038] The present invention provides a compact structure, precise adjustment, and sensitive response, making it particularly suitable for industrial scenarios requiring real-time control of the output airflow of a plasma torch. It has significant practical value and promising prospects for engineering promotion.

[0039] Working principle and usage process of this utility model: This invention constructs an adjustable throat device based on an iris structure, combined with the Venturi jet principle, to achieve dynamic adjustment of the gas velocity and cross-sectional size at the plasma jet exit, thereby optimizing the plasma energy distribution and jet focusing effect under cutting conditions.

[0040] In the specific working process, the air source enters the throat section 103 from the air intake section 102, and flows sequentially along the internal contraction-throat-expansion Venturi channel, wherein: When the gas flows through the throat section 103, due to the smallest inner diameter of the flow channel, its velocity increases rapidly and its pressure decreases under the action of the Venturi effect, forming the basis of a high-speed jet. The adjustable valve group 200, located between the throat section 103 and the injection end 101, is used to continuously adjust the effective jet cross section of the throat region. Its core structure includes a static guide ring 210, a dynamic ring 220, and several valve blades 230 arranged circumferentially. A guide groove 211 and a sliding sleeve groove 221 are constructed between the moving ring 220 and the stationary guide ring 210 to guide the valve leaf 230 to slide precisely along the spiral trajectory under the cooperation of the sliding pin 231 and the convex sliding block 232, so that all valve leaves 230 can open and close synchronously, thereby adjusting the diameter of the central throat. The outer side of valve leaf 230 is an integral conical structure. When it is fully closed, the central orifice diameter is the smallest, which is suitable for high-speed, low-flow jet scenarios. When it is open, the orifice diameter increases, which is suitable for high-flow, large-area energy distribution scenarios.

[0041] Throughout the adjustment process, the valve vanes 230 form a conical guide valve control through a conical transition, avoiding airflow impact and turbulence caused by the vertical end face, and ensuring that the jet flow field is stable, symmetrical and controllable.

[0042] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A plasma torch jet device, characterized in that, include: The jet tube (100) includes a jet end (101), an air intake section (102) and a throat section (103), and the inner cavity of the jet tube (100) forms a contraction-throat-expansion Venturi channel. A flange seat (110) is connected to the outside of the air intake section (102) and is used for overall installation and fixation; A control ring (120) is rotatably mounted on the flange seat (110); An adjustable valve assembly (200) is provided at the junction of the throat section (103) and the injection end (101), and includes: a stationary guide ring (210) fixedly installed on the inner wall of the jet tube body (100), and the stationary guide ring (210) is provided with a plurality of guide grooves (211). The moving ring (220) rotates synchronously with the control ring (120), and the moving ring (220) is provided with multiple sliding sleeve grooves (221). Several valve blades (230) are slidably connected to the guide groove (211) and the sliding sleeve groove (221) respectively through sliding pins (231) and convex sliding blocks (232), so that multiple valve blades (230) are arranged concentrically around the central axis and can open and close synchronously to form an adjustable throat orifice.

2. The plasma torch jet device according to claim 1, characterized in that, The number of valve leaves (230) is not less than 6, and each valve leaf is engaged with each other in the closed state and arranged in a circular pattern to form a continuously variable aperture.

3. The plasma torch jet device according to claim 1, characterized in that, The inner side of the control ring (120) is provided with a pin that penetrates the surface of the throat section (103), and the pin is fixedly connected to the outer periphery of the moving ring (220). The control ring (120) is driven by an external drive mechanism and can be manually or automatically rotated to realize the synchronous adjustment of the opening and closing angle of the valve leaf (230).

4. A plasma torch jet device according to claim 1, characterized in that, The throat section (103) is the fluid acceleration channel with the smallest diameter in the middle, and together with the adjustable valve group (200), it forms the smallest cross-section of the Venturi jet channel.

5. A plasma torch jet device according to claim 1, characterized in that, The stationary guide ring (210) and the moving ring (220) are both concentric ring structures, and are respectively installed at the junction of the throat section (103) and the injection end (101) by threaded connection or slot positioning.

6. A plasma torch jet device according to claim 1, characterized in that, The valve leaf (230) is connected to the sliding pin (231) through an integral hinge structure, and the convex sliding block (232) slides along an arc trajectory in the sliding sleeve groove (221) to achieve synchronous opening and closing.

7. A plasma torch jet device according to claim 1, characterized in that, The valve leaf (230) has a tapered shape with its thickness gradually decreasing towards the center along the radial direction of the static guide ring (210), which is used to form a tapered cross-section on both sides of several valve leaves (230).

Images