Multi-point discharge plasma arc generator

Abstract

The invention provides a multi-point discharge plasma arc generator. A plasma arc generator relates to a plasma arc generator, overcomes the problem that an existing plasma arc generator ablates electrodes and leads to unstable ignition effect, and comprises an anode and a cathode which are coaxially arranged, the cathode is located in the anode, and a ventilation channel is reserved between the cathode and the anode; the anode comprises an anode shell and an end part, the anode shell is in a circular tube shape, the end part is a circular end surface matched with the anode shell, and the end part is positioned at one end of the anode shell; the cathode comprises a cathode shaft rod and a cathode head, the cathode head is located at one end of the cathode shaft rod and is in a conical shape, and the tip end of the cathode head faces the circle center of the end face. A plurality of discharge ports are formed in the end part, and are uniformly formed in the circular end surface in a ring shape or a ring-like shape. According to the invention, full plasma arcs can be formed at the plurality of openings at the end part of the anode, so that the effect of multi-point discharge is achieved.

Description

Technical Field

[0001] This invention relates to plasma arc generators, and more particularly to a multi-point discharge plasma arc generator. Background Technology

[0002] Plasma ignition overcomes the shortcomings of traditional ignition methods. Through mechanical compression, thermal compression, and electromagnetic compression of plasma at the nozzle exit, it easily forms a stable ignition core. It has advantages such as high ignition energy, concentrated ignition core, and strong penetration, which can improve the reliability of ignition. It can also generate active particles to reduce the activation energy of chemical reactions and broaden the ignition boundary of the gas turbine combustion chamber.

[0003] The plasma arc generator is the core component of a plasma ignition device. A high voltage is generated between its anode and cathode via a power supply. This high voltage breaks down the dielectric between the anode and cathode, forming a high-energy, directional plasma arc, thus achieving ignition. A schematic diagram of an existing plasma arc generator is shown below. Figure 1 As shown, the anode of the plasma arc generator is annular, and the cathode is coaxially arranged with the anode. The distance between the cathode head and the anode annulus meets certain conditions. When the voltage applied between the cathode and anode is greater than the breakdown voltage of the dielectric between them, breakdown occurs, generating a plasma arc and creating a conductive state. Existing plasma arc generators have high ignition energy and high temperature, which can damage the electrodes, leading to unstable ignition effects, shortened lifespan, and reduced reliability. Furthermore, the generated plasma arc is fixed and uniform, resulting in low generation efficiency. Summary of the Invention

[0004] A brief overview of the invention is given below to provide a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0005] In view of this, in order to solve the above problems, the present invention proposes a multi-point discharge plasma arc generator, comprising:

[0006] The anode and cathode are coaxially arranged, with the cathode located inside the anode and a ventilation channel provided between the cathode and the anode;

[0007] The anode includes an anode housing and an end. The anode housing is in the shape of a cylindrical tube, and the end is a circular end face that matches the anode housing. The end is located at one end of the anode housing.

[0008] The cathode includes a cathode shaft and a cathode head. The cathode head is located at one end of the cathode shaft and is conical, with the tip of the cathode head facing the center of the end face.

[0009] The end is provided with multiple discharge ports, which are uniformly arranged in a ring or similar ring shape on the circular end face.

[0010] Preferably, the plasma arc generator further includes an insulating connection structure, wherein the insulating connection structure is annular and fills the space between the anode housing and the cathode shaft.

[0011] Preferably, the anode housing is provided with multiple evenly distributed air inlets, through which the ignition medium enters the ventilation channel.

[0012] Preferably, the discharge port is circular or elliptical in shape, and the center of each discharge port is equidistant from the tip of the cathode head.

[0013] Preferably, the discharge port is circular in shape, and the diameter of the discharge port is 1 / 4 to 1 / 6 of the diameter of the end.

[0014] Preferably, the gap between the tip of the cathode head and the end is 0.5 mm to 2 mm.

[0015] Preferably, the number of discharge ports is either odd or even.

[0016] Preferably, the number of discharge ports is even, and the discharge ports are arranged alternately in circular and elliptical shapes.

[0017] Preferably, the anode housing is provided with connecting threads on the outer side away from the end for assembling a cable connector.

[0018] Preferably, the portion where the cathode shaft intersects with the insulating connection structure is provided with one or more sealing recesses for filling with sealing material.

[0019] The multi-point discharge plasma arc generator of the present invention includes an anode and a cathode arranged coaxially. Multiple discharge ports are provided at the end of the anode, and these ports are evenly distributed around the center of the anode end. This invention can form a densely distributed plasma arc at multiple openings at the anode end, achieving a multi-point discharge effect. This can shorten the ignition delay time of the plasma igniter, increase ignition efficiency, and enhance ignition stability and reliability. Simultaneously, multi-point discharge avoids the problem of a fixed, single plasma arc and low efficiency in generating active particles. Furthermore, this invention is applicable to various working conditions and has strong practical value.

[0020] These and other advantages of the invention will become more apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0021] The present invention can be better understood by referring to the description given below in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to denote the same or similar parts. These drawings, together with the following detailed description, are incorporated in and form part of this specification, and are used to further illustrate preferred embodiments of the invention and explain the principles and advantages of the invention. In the drawings:

[0022] Figure 1 This is a schematic diagram illustrating the structure of a prior art plasma arc generator;

[0023] Figure 2 This is a schematic diagram illustrating the structure of the multi-point discharge plasma arc generator of the present invention;

[0024] Figure 3 This is a schematic diagram showing the end portion of the multi-point discharge plasma arc generator of the present invention;

[0025] Figure 4 This is a schematic diagram showing the end portion of the multi-point discharge plasma arc generator of the present invention;

[0026] Figure 5 This is a schematic diagram showing the end of the multi-point discharge plasma arc generator of the present invention.

[0027] Among them, 1. anode; 2. cathode; 3. insulating connection structure; 4. air inlet; 5. connecting thread; 6. discharge port; 7. sealing pit.

[0028] Those skilled in the art will understand that the elements in the accompanying drawings are shown for simplicity and clarity only, and are not necessarily drawn to scale. For example, the dimensions of some elements in the drawings may be enlarged relative to other elements to aid in understanding the embodiments of the invention. Detailed Implementation

[0029] Specific embodiments of the present invention will be described in conjunction with the accompanying drawings. It should be noted that the specific embodiments described are for illustrative purposes only and are not intended to limit the invention. Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing fixed or detachable connections, mechanical or electrical connections, direct or indirect connections via an intermediate medium, and internal communication between two components. Those skilled in the art should understand the meaning of these terms in this invention according to the specific circumstances.

[0030] In this invention, unless explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact through other features between them without direct contact. Furthermore, "above," "over," and "on top" include the first feature directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature; "below," "below," and "under" include the first feature directly below or diagonally below the second feature, or simply indicate that the first feature is at a lower horizontal level than the second feature.

[0031] Furthermore, the technical features involved in different embodiments of the present invention can be combined with each other, as long as they do not conflict with each other. In this disclosure, for ease of description, the accompanying drawings typically show only the parts relevant to the present invention, and not all of them.

[0032] like Figure 2 As shown, an embodiment of the present invention provides a multi-point discharge plasma arc generator, comprising:

[0033] An anode 1 and a cathode 2 are coaxially arranged, with the cathode 2 located inside the anode 1 and a ventilation channel left between the cathode 2 and the anode 1;

[0034] The anode 1 includes an anode housing and an end. The anode housing is in the shape of a cylindrical tube, and the end is a circular end face that matches the anode housing. The end is located at one end of the anode housing.

[0035] The cathode 2 includes a cathode shaft and a cathode head. The cathode head is located at one end of the cathode shaft and is conical. The tip of the cathode head faces the center of the end face.

[0036] The end is provided with a plurality of discharge ports 6, which are uniformly arranged in a ring or similar ring on the circular end face.

[0037] In existing gas turbines, high-energy ignition and plasma ignition are commonly used to improve ignition reliability and shorten ignition delay time. However, existing plasma arc generators generally suffer from high ignition energy and high temperature, causing electrode erosion, resulting in unstable ignition effects, shortened service life, reduced reliability, and a fixed, singular plasma arc formation with low efficiency in generating active particles. This invention's multi-point discharge plasma arc generator includes a coaxially arranged cylindrical anode shell, a cathode 2 with a pointed conical tip, and a ring-shaped insulating connection structure 3. Multiple discharge ports 6 are provided at the end of the anode, and these ports are evenly distributed in a ring or similar ring shape around the center of the anode end. This invention can form a full-coverage plasma arc around the multiple ports at the anode end, achieving a multi-point discharge effect.

[0038] In this embodiment of the invention, the anode shell and the cathode shaft can be made of 316L stainless steel, which has excellent corrosion resistance, high temperature strength, thermal stability, electrical conductivity and thermal conductivity.

[0039] In this embodiment of the invention, the plasma arc generator further includes an insulating connection structure 3, which is annular and fills the space between the anode housing and the cathode shaft.

[0040] In this embodiment of the invention, the insulating connection structure 3 is annularly filled between the anode shell and the cathode shaft, and the anode, cathode, and insulating connection structure are all coaxially arranged. The maximum outer diameter of the insulating connection structure 3 is equal to the inner diameter of the anode shell, and the inner diameter of the insulating connection structure 3 is equal to the maximum outer diameter of the cathode shaft. The insulating connection structure 3 can be made of an integrally sintered ceramic material.

[0041] In this embodiment of the invention, the anode housing is provided with a plurality of uniformly distributed air inlets 4, and the ignition medium enters the ventilation channel through the air inlets 4.

[0042] like Figure 3-5 As shown in the embodiment of the present invention, the shape of the discharge port 6 is circular or elliptical, and the center of each discharge port 6 is equidistant from the tip of the cathode head.

[0043] In this embodiment of the invention, multiple discharge ports 6 are evenly distributed in a ring or similar ring around the center of the anode end. The center of each discharge port 6 is equidistant from the conical tip of the cathode head. The discharge ports 6 are circular or elliptical in shape.

[0044] In this embodiment of the invention, the discharge port 6 is circular in shape, and the diameter of the discharge port 6 is 1 / 4 to 1 / 6 of the diameter of the end.

[0045] In this embodiment of the invention, the gap between the tip of the cathode head and the end is 0.5 mm to 2 mm.

[0046] In this embodiment of the invention, a certain gap is left between the tip of the cathode head and the end of the anode, preferably 0.5 mm to 2 mm.

[0047] In this embodiment of the invention, the number of discharge ports 6 is either odd or even.

[0048] like Figure 3-5 As shown in the embodiment of the present invention, there are 4 to 6 discharge ports 6 evenly distributed along the center of the anode end.

[0049] In this embodiment of the invention, the number of discharge ports is even, and the discharge ports are arranged alternately in circular and elliptical shapes.

[0050] In this embodiment of the invention, a connecting thread 5 is provided on the outer side of the anode housing away from the end, for assembling a cable connector.

[0051] In this embodiment of the invention, one or more sealing recesses 7 are provided at the junction of the cathode shaft and the insulating connection structure for filling with sealing material.

[0052] Example

[0053] like Figure 2 and 3 As shown in the embodiment of the invention, the anode housing is provided with multiple evenly distributed air inlets 4. Air (ignition medium) enters the anode housing through the air inlets 4, passes through the dense plasma arc, and is excited to form active particles that are ejected from the end of the anode to enhance ignition and assist combustion. The insulating connection structure 3 is made of ceramic using integrated sintering technology. Four perfectly circular discharge ports 6 are provided at the end of the anode, evenly distributed around the center of the end of the anode.

[0054] The multi-point discharge plasma arc generator of this embodiment is further connected to a cable base, a power supply device, and a control device. The connecting thread 5 is used to fix the plasma arc generator in the combustion chamber. At the same time, the power supply device and the control device are connected. The power supply device provides a high-frequency high voltage to break down the gap between the cathode tip and the anode end, thereby forming a diffuse multi-point discharge around the four circular holes at the anode end. At the same time, the introduced air is ionized to form excited-state active particles that are injected into the combustion chamber, thereby shortening the ignition delay time and enhancing the stability of plasma ignition. It has strong practical value.

[0055] Although the invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A multi-point discharge plasma arc generator, characterized in that, include: The anode and cathode are coaxially arranged, with the cathode located inside the anode and a ventilation channel provided between the cathode and the anode; The anode includes an anode housing and an end. The anode housing is in the shape of a cylindrical tube, and the end is a circular end face that matches the anode housing. The end is located at one end of the anode housing. The cathode includes a cathode shaft and a cathode head. The cathode head is located at one end of the cathode shaft and is conical, with the tip of the cathode head facing the center of the end face. The end is provided with multiple discharge ports, which are uniformly arranged in a ring or similar ring shape on the circular end face.

2. The plasma arc generator as described in claim 1, characterized in that, Also includes: An insulating connection structure, wherein the insulating connection structure is annular and fills the space between the anode housing and the cathode shaft.

3. The plasma arc generator as described in claim 1 or 2, characterized in that, The anode housing is provided with multiple evenly distributed air inlets, through which the ignition medium enters the ventilation channel.

4. The plasma arc generator as described in claim 1 or 2, characterized in that, The discharge port is circular or elliptical in shape, and the center of each discharge port is equidistant from the tip of the cathode head.

5. The plasma arc generator as described in claim 4, characterized in that, The discharge port is circular in shape, and the diameter of the discharge port is 1 / 4 to 1 / 6 of the diameter of the end.

6. The plasma arc generator as described in claim 4, characterized in that, The gap between the tip of the cathode head and the end is 0.5 mm to 2 mm.

7. The plasma arc generator as described in claim 4, characterized in that, The number of discharge ports is either odd or even.

8. The plasma arc generator as described in claim 7, characterized in that, The number of discharge ports is even, and the discharge ports are arranged alternately in circular and elliptical shapes.

9. The plasma arc generator as described in claim 1, characterized in that, The anode housing is provided with connecting threads on the outer side away from the end for assembling cable connectors.

10. The plasma arc generator as described in claim 2, characterized in that, The portion where the cathode shaft intersects with the insulating connection structure is provided with one or more sealing recesses for filling with sealing material.

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