Arc extinction device and method based on enhanced special linear motor

Abstract

The invention discloses an arc extinction device and method based on an enhanced special linear motor, and belongs to the field of pulse power technology and application, a resistance-inductive element is bridged to the bore openings of two main rails, so that the main rails with the original open bore openings are electrically connected through the resistance-inductive element; before the armature goes out of the chamber, the resistive and inductive element and the main rail at the front end of the armature operate as a parallel branch of the armature in the circuit topology, and after the armature goes out of the chamber, the resistive and inductive element operates as a series branch between the two main rails in the circuit topology; according to the arc extinguishing method, the operation characteristics of the enhanced special linear motor are combined, the pivot rail current at the moment of out-of-chamber can be remarkably reduced or even eliminated, flash, sound and impact caused by chamber opening electric arcs are greatly reduced, and under the same operation working condition, the device concealment, safety, service life and other performance are remarkably improved.

Description

Technical Field

[0001] The invention belongs to the field of pulse power technology and applications, and specifically relates to an arc extinguishing device and method based on an enhanced special linear motor. Background Art

[0002] The special linear motor is a new concept device that uses electromagnetic force to push the armature to accelerate. From the perspective of guide rail layout, it can be divided into simple special linear motors and enhanced special linear motors. The enhanced special linear motor is composed of multi-turn guide rails; among them, the guide rail in close contact with the armature serves as the main rail, and the current flows into the armature through the main rail to provide electromagnetic thrust for the armature. The remaining guide rails serve as auxiliary rails to provide additional magnetic fields for the enhanced special linear motor. When the same load current is input, the equivalent inductance gradient of the enhanced special linear motor increases significantly due to the existence of the additional magnetic field, which can provide greater electromagnetic thrust.

[0003] Theoretically, special linear motors can be silent and lightless, and have extremely high concealment. Due to the low power conversion efficiency of special linear motors, a large amount of energy still remains in the system when the armature is ejected, and the residual current corresponding to the moment of ejection is generally tens to hundreds of kiloamperes. At the moment of ejection, the gap between the armature and the guide rail changes suddenly, and the higher residual current causes the electrical contact between the armature and the guide rail to change to arc contact, and the continuous burning of the arc forms a muzzle arc. The residual energy in the system is fully released in the form of a muzzle arc, resulting in severe ablation of the muzzle insulation and the guide rail, accompanied by flashes, sounds and impacts, which have an adverse effect on the concealment, safety and life of the device. In order to prevent the residual energy in the system from being released in the form of a muzzle arc, corresponding suppression methods need to be adopted. At this stage, the mainstream method of suppressing the muzzle arc is to install an arc starter. At the moment of ejection, the armature rail current is quickly transferred to the electrode of the arc starter, which can alleviate the damage caused by the muzzle arc to a certain extent. However, the heat and arc force generated by the arcing process on the arc starter will cause ablation of the electrode material, which will affect the service performance of the arc starter and eventually lead to the failure of the pivot rail current to be fully transferred to the arc starter after the bolt is fired. At the same time, since the function of the arc starter is only to transfer but not eliminate the pivot rail current at the moment of firing, the flash, sound and impact generated when firing still exist, and the impact of the muzzle arc is not completely eliminated. Summary of the invention

[0004] In view of this, the present invention provides an arc extinguishing device based on an enhanced special linear motor, comprising an armature, a resistive-inductive element, and a main rail and a secondary rail of the enhanced special linear motor; wherein the armature is the emission object of the enhanced special linear motor, and the electromagnetic force generated after the armature passes current drives the armature to perform accelerated motion, and the enhanced special linear motor is composed of multiple pairs of guide rails, and the multiple pairs of guide rails are divided into main rails and secondary rails, the main rails refer to a pair of guide rails that are in direct contact with the tail of the armature, and the secondary rails refer to other pairs of guide rails except the main rails, and the two ends of the enhanced special linear motor are divided into the tail and the mouth of the bore according to the movement direction of the armature, and the armature moves from the tail of the bore to the mouth of the bore under the action of the electromagnetic force, and the ejection of the bore refers to the process in which the armature is pushed out of the mouth of the bore by the electromagnetic force;

[0005] The resistive-inductive element forms an electrical connection with the main rail at the bore, that is, the resistive-inductive element is connected across the bore of the two main rails, so that the main rails form an electrical connection through the resistive-inductive element; before the armature is ejected from the bore, the resistive-inductive element and the main rail at the front end of the armature operate as a parallel branch of the armature in the circuit topology, and after the armature is ejected from the bore, the resistive-inductive element operates as a series branch of the main rail in the circuit topology.

[0006] The present invention also provides an arc extinguishing method of the arc extinguishing device based on the enhanced special linear motor, the method comprising:

[0007] During the rising edge of the load current, the magnetic field generated by the load current on the main rail and the auxiliary rail also increases rapidly, causing the magnetic flux in the closed loop at the front end of the armature to increase rapidly, generating an induced current in the closed loop at the front end of the armature. The induced magnetic field generated by the induced current hinders the change of the magnetic flux in the closed loop. At this time, the induced current increases rapidly from zero and flows into the armature together with the load current, providing electromagnetic thrust for the armature at the same time. Among them, the closed loop at the front end of the armature refers to the loop composed of the main rail at the front end of the armature, the branch where the resistive and inductive elements are located, and the armature. The load current refers to the pulsed large current fed from the tail end of the bore to the enhanced special linear motor;

[0008] After the rising edge of the load current ends, the armature is already in the motion stage, which causes the area surrounded by the closed loop at the front end of the armature to decrease, and then causes the magnetic flux in the closed loop at the front end of the armature to decrease. At this time, the amplitude of the induced current in the closed loop begins to gradually decrease;

[0009] At the falling edge of the load current and before the armature is ejected from the barrel, the magnetic flux in the closed loop at the front end of the armature decreases rapidly as the load current decreases. At the same time, the area surrounded by the closed loop at the front end of the armature also continues to decrease due to the movement of the armature. Under the combined effect of these two factors, the induced current in the closed loop will decrease at an accelerated rate, and increase in the reverse direction after the induced current decreases to zero. When the induced current reverses, the amplitude of the armature current is the difference between the load current and the induced current. At this time, the resistive-inductive element acts as a shunt to divert part of the current that should flow into the armature. This shunting effect continues until the armature is ejected from the barrel, thereby achieving the purpose of eliminating the ejection current.

[0010] After the armature is ejected from the barrel, the resistive-inductive element acts as a series branch between the two main rails to consume the remaining energy.

[0011] The present invention has the following beneficial effects:

[0012] The arc extinguishing device and method of the present invention utilize the operating characteristics of the enhanced special linear motor with an additional magnetic field, so that the resistive inductive element no longer exists in the form of a shunt throughout the entire launch process. In the early and middle stages of the launch process, the induced current generated by the closed loop at the front end of the armature where the arc extinguishing device is located is in the same direction as the load current. At this time, the armature current is the sum of the two, which will enhance the electromagnetic force acting on the armature, so that part of the electromagnetic energy in the closed loop at the front end of the armature is converted into armature kinetic energy, which is used for the accelerated movement of the armature, ensuring that the energy is not completely lost in the form of heat energy, thereby ensuring system efficiency; at the falling edge stage of the load current, the induced current reverses, and at this time it plays the role of a shunt, reducing the armature current until it leaves the chamber, thereby achieving the purpose of arc extinguishing.

[0013] The arc extinguishing device and method of the present invention utilizes Lenz's law to significantly reduce or even completely eliminate the pivot rail current at the time of discharge, greatly reducing the flash, sound and impact caused by the muzzle arc. Under the same operating conditions, the concealment, safety, life and other performance of the device are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0015] Figure 1 A structural topological diagram of an arc extinguishing device based on an enhanced special linear motor provided in an embodiment of the present invention;

[0016] Figure 2 A circuit diagram of an arc extinguishing method based on an enhanced special linear motor at the rising edge stage of a load current provided by an embodiment of the present invention;

[0017] Figure 3A circuit diagram of an arc extinguishing method based on an enhanced special linear motor provided by an embodiment of the present invention after the load current rising edge stage ends;

[0018] Figure 4 A circuit diagram of an arc extinguishing method based on an enhanced special linear motor provided by an embodiment of the present invention at the falling edge stage of the load current and before the armature is ejected from the chamber;

[0019] Figure 5 A circuit diagram of an arc extinguishing method based on an enhanced special linear motor after the armature is ejected from the barrel provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other. To achieve the above-mentioned purpose, the present invention adopts the following technical scheme.

[0021] See also Figure 1 , the embodiment of the present invention provides a structural topology diagram of an arc extinguishing device based on an enhanced special linear motor. Among them, the armature is the launch object of the enhanced special linear motor. The electromagnetic force generated after the armature passes through the current pushes the armature to accelerate and is the power source of the armature. The enhanced special linear motor is composed of multiple pairs of guide rails, which are divided into main rails and auxiliary rails. The main rail refers to a pair of guide rails that are in direct contact with the tail of the armature, and the auxiliary rail refers to other pairs of guide rails except the main rail. The two ends of the enhanced special linear motor are divided into the tail and the mouth of the bore according to the movement direction of the armature. The armature moves from the tail of the bore to the mouth of the bore under the action of the electromagnetic force, and the ejection of the bore refers to the process in which the armature is pushed out of the mouth of the bore by the electromagnetic force.

[0022] The resistive-inductive element forms an electrical connection with the main rail at the muzzle, that is, the resistive-inductive element is bridged to the muzzle of the two main rails, so that the main rail that was originally open at the muzzle forms an electrical connection through the resistive-inductive element; before the armature is ejected from the muzzle, the resistive-inductive element and the main rail at the front end of the armature operate as a parallel branch of the armature in the circuit topology, and after the armature is ejected from the muzzle, the resistive-inductive element operates as a series branch of the main rail in the circuit topology.

[0023] The electrical parameters of the resistive-inductive element can be determined by an inductance value R X and a resistor value L X Indicates that the inductance value R X Including the inductance value and stray inductance value of the resistive and inductive components, the resistance value L X It includes the resistance value of the resistive and inductive components themselves, the stray resistance value and the contact resistance value between the connecting parts.

[0024] Figure 2 The circuit diagram of an arc extinguishing method based on an enhanced special linear motor provided by an embodiment of the present invention at the rising edge stage of the load current. Figure 2 As shown in the figure, during the rising edge of the load current, the magnetic field generated by the load current on the main rail and the auxiliary rail also increases rapidly, causing the magnetic flux Φ in the closed loop at the front end of the armature to M It also increases rapidly, generating an induced current i in the closed loop at the front end of the armature X According to Lenz's law, the induced magnetic field Φ generated by the induced current X It will hinder the change of magnetic flux in the closed loop. At this time, the induced current i X It starts to increase rapidly from zero, and the load current i M The load current i M Refers to the pulsed high current fed from the rear end of the bore to the enhanced special linear motor, i a is the armature current.

[0025] Figure 3 A circuit diagram of an arc extinguishing method based on an enhanced special linear motor provided by an embodiment of the present invention after the load current rising edge stage ends. Figure 3 As shown in the figure, when the load current rises, the armature is already in the motion stage, which causes the area surrounded by the closed loop at the front end of the armature to decrease, and the magnetic flux Φ in the closed loop at the front end of the armature M decreases, and the induced current i in the closed loop X The amplitude begins to decrease gradually.

[0026] Figure 4 A circuit diagram of an arc extinguishing method based on an enhanced special linear motor provided by an embodiment of the present invention at the falling edge of the load current and before the armature is ejected. Figure 4 As shown in the figure, at the falling edge of the load current and before the armature is ejected, the magnetic flux Φ in the closed loop at the front end of the armature is M As the load current i M At the same time, the area surrounded by the closed loop at the front end of the armature also continues to decrease due to the movement of the armature. Under the combined effect of these two factors, the induced current i in the closed loop X The acceleration decreases, and increases in the reverse direction after the induced current decreases to zero. X In the reverse direction, the armature current i a The amplitude is the load current i M With the induced current i XThe difference between the two, at this time, the resistive and inductive elements act as shunts, diverting part of the current that should flow into the armature. This shunting effect continues until the armature is ejected from the barrel, thereby achieving the purpose of eliminating the current.

[0027] Figure 5 A circuit diagram of an arc extinguishing method based on an enhanced special linear motor after the armature is ejected from the chamber is provided in an embodiment of the present invention. Figure 5 As shown, after the armature is ejected, the resistive-inductive element acts as a series branch between the two main rails, and the load current i M The residual energy of the armature after it leaves the barrel is gradually decayed to zero, and is released through the series circuit composed of the guide rail and the resistive and inductive elements, thus avoiding the adverse effects of release in the form of an arc.

Claims

1. An arc extinguishing device based on an enhanced special linear motor, characterized in that: The device includes an armature, a resistive-inductive element, and a main rail and a secondary rail of an enhanced special linear motor; wherein the armature is the launch object of the enhanced special linear motor, and the electromagnetic force generated after the armature is energized drives the armature to perform accelerated motion. The enhanced special linear motor is composed of multiple pairs of guide rails, and the multiple pairs of guide rails are divided into main rails and secondary rails. The main rail refers to a pair of guide rails that are in direct contact with the tail of the armature, and the secondary rail refers to other pairs of guide rails except the main rail. The two ends of the enhanced special linear motor are divided into the tail and the mouth of the bore according to the movement direction of the armature. The armature moves from the tail of the bore to the mouth of the bore under the action of the electromagnetic force, and the ejection of the bore refers to the process in which the armature is pushed out of the mouth of the bore by the electromagnetic force; The resistive-inductive element forms an electrical connection with the main rail at the bore, that is, the resistive-inductive element is connected across the bore of the two main rails, so that the main rails form an electrical connection through the resistive-inductive element; before the armature is ejected from the bore, the resistive-inductive element and the main rail at the front end of the armature operate as a parallel branch of the armature in the circuit topology, and after the armature is ejected from the bore, the resistive-inductive element operates as a series branch of the main rail in the circuit topology.

2. The arc extinguishing device based on the enhanced special linear motor according to claim 1, characterized in that: The electrical parameters of the resistive-inductive element are represented by an inductance value and a resistance value. The inductance value includes the inductance value and stray inductance value of the resistive-inductive element itself, and the resistance value includes the resistance value, stray resistance value and contact resistance value between the connecting parts of the resistive-inductive element.

3. An arc extinguishing method based on an arc extinguishing device of an enhanced special linear motor according to any one of claims 1 to 2, characterized in that: The method comprises: During the rising edge of the load current, the magnetic field generated by the load current on the main rail and the auxiliary rail also increases rapidly, causing the magnetic flux in the closed loop at the front end of the armature to increase rapidly, generating an induced current in the closed loop at the front end of the armature. The induced magnetic field generated by the induced current hinders the change of the magnetic flux in the closed loop. At this time, the induced current increases rapidly from zero and flows into the armature together with the load current, providing electromagnetic thrust for the armature at the same time. Among them, the closed loop at the front end of the armature refers to the loop composed of the main rail at the front end of the armature, the branch where the resistive and inductive elements are located, and the armature. The load current refers to the pulsed large current fed from the tail end of the bore to the enhanced special linear motor; After the rising edge of the load current ends, the armature is already in the motion stage, which causes the area surrounded by the closed loop at the front end of the armature to decrease, and then causes the magnetic flux in the closed loop at the front end of the armature to decrease. At this time, the amplitude of the induced current in the closed loop begins to gradually decrease; At the falling edge of the load current and before the armature is ejected from the barrel, the magnetic flux in the closed loop at the front end of the armature decreases rapidly as the load current decreases. At the same time, the area surrounded by the closed loop at the front end of the armature also continues to decrease due to the movement of the armature. Under the combined effect of these two factors, the induced current in the closed loop will decrease at an accelerated rate, and increase in the reverse direction after the induced current decreases to zero. When the induced current reverses, the amplitude of the armature current is the difference between the load current and the induced current. At this time, the resistive-inductive element acts as a shunt to divert part of the current that should flow into the armature. This shunting effect continues until the armature is ejected from the barrel, thereby achieving the purpose of eliminating the ejection current. After the armature is ejected from the barrel, the resistive-inductive element acts as a series branch between the two main rails to consume the remaining energy.

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