A combined voltage transformer with fuse and anti-ferromagnetic resonance

Abstract

This invention discloses a combined voltage transformer with fuses and anti-ferromagnetic resonance, comprising a base, three main voltage transformers arranged parallel to each other on the base, a zero-sequence voltage transformer arranged on the same side of the arrangement direction, and three corresponding fuses conductively connected to the high-voltage side of the main voltage transformers. The fuses internally have a labyrinthine frame covered with a vaporized arc-extinguishing layer, and a spiral strip-shaped fusible element with holes. The end cap contains a striking pin mechanism composed of a metal wire, an elastic element, and a metal ball, and has an exhaust port. In the event of a short circuit or overload, this invention can isolate and divide the arc, efficiently extinguishing it using airflow. Simultaneously, the striking pin mechanism triggers an alarm and accelerates the retraction of the metal ball, instantly and directionally releasing the internal overload pressure, significantly improving the arc-extinguishing efficiency and safety performance of the equipment.

Description

Technical Field

[0001] This invention relates to the field of voltage transformer technology, and in particular to a combined voltage transformer with a fuse and anti-ferromagnetic resonance. Background Technology

[0002] Voltage transformers are crucial measurement and protection devices in power systems. In actual operation, influenced by grid operating conditions, voltage transformers face risks such as ferroresonance. When an overload or short-circuit fault occurs inside the transformer, generating an electric arc, existing equipment has limitations in rapidly interrupting the short-circuit current, separating and cooling the arc, and instantly releasing internal expansion pressure. This can easily lead to the inability to effectively and promptly expel high-pressure gas, thus affecting the equipment's safety performance. Summary of the Invention

[0003] The purpose of this invention is to provide a combined voltage transformer with fracturing circuit breaker to solve the technical problems of arc extinguishing efficiency and internal high-pressure gas venting and depressurization in traditional voltage transformers under overload or short circuit conditions.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a combined voltage transformer with a fuse and anti-ferromagnetic resonance, wherein the combined voltage transformer with a fuse includes: Base; Three main voltage transformers are arranged parallel to each other and side by side on the base. A zero-sequence voltage transformer is disposed on the same side of the arrangement direction of the three main voltage transformers and is mounted on the base together with the three main voltage transformers. The fuse is connected to the main voltage transformer. There are three fuses, each corresponding to one of the three main voltage transformers, and one end of each fuse is conductively connected to the high-voltage side of the main voltage transformer.

[0005] In one embodiment, each of the three main voltage transformers has an independent high-voltage terminal block insulated on its top; the three fuses are disposed outside the insulating housing of the main voltage transformers, one end of the fuse is horizontally fixed to the high-voltage terminal block of the corresponding main voltage transformer by a metal connector, and the other end is suspended or supported by an independent insulating support; the end caps of the fuses are directly exposed to the external environment.

[0006] In one embodiment, the fuse includes: The outer tube is an epoxy resin fiberglass pipe; End caps, which are sealed and fixed to both ends of the outer tube, are made of insulating material; Metal terminals are disposed on the end cap; A labyrinth-type frame, wherein the labyrinth-type frame is located inside the outer tube, and both ends of the labyrinth-type frame are fixed to the metal terminals; A melt, which is mounted on the labyrinth-like frame, with both ends of the melt electrically connected to the metal terminals; A quartz sand filling layer is densely filled inside the outer tube and covers the labyrinth skeleton and the melt.

[0007] In one embodiment, the labyrinthine skeleton includes: The skeleton body has a cylindrical structure and a spiral groove on its surface. The melt is located in the groove. The skeleton body is made of high-temperature resistant ceramic. A vaporization arc-extinguishing layer is provided, which covers the surface of the groove. The vaporization arc-extinguishing layer is used to vaporize when the melt breaks and generates an electric arc, so as to extinguish the arc by utilizing the dynamic effect of the airflow.

[0008] In one embodiment, the melt is in the shape of a spiral strip, and a plurality of holes are evenly distributed along its length. The holes distributed on the melt form multiple narrow necks in the width direction of the melt; when an overload or short-circuit current passes through, multiple necks melt simultaneously, dividing the single cutting arc into multiple short arcs connected in series; the spiral grooves of the labyrinth-like skeleton physically isolate the short arcs to cooperate with the vaporized arc-extinguishing layer for segmented arc extinguishing.

[0009] In one embodiment, the fuse further includes a striking pin actuation mechanism, the striking pin actuation mechanism comprising: The mounting groove is formed inside the end cap, and one end of the mounting groove has a through hole; An electrical connector is fixedly disposed in the mounting groove, and the electrical connector is connected to the metal terminal on the same side via a connecting wire; A metal wire, one end of which is connected to the metal terminal on the opposite side, and the other end extends through the through hole into the mounting groove; A metal ball, which is movably disposed in the mounting groove and fixedly connected to the other end of the metal wire; An elastic element is disposed in the mounting groove, one end of which is fixed to the inner wall of the mounting groove, and the other end is connected to the metal ball. A micro switch, which is fixed to the inner wall of the mounting groove and positioned adjacent to the movement trajectory of the metal ball; In normal operation, the metal wire overcomes the tension of the elastic element, pulls the metal ball tight, and abuts it against the electrical connection piece, so that the metal wire and the molten material form a parallel circuit.

[0010] In one embodiment, the end cap is further provided with a vent hole, which connects the mounting groove to the external environment of the fuse; the end of the through hole near the mounting groove has a chamfered structure, the electrical connection piece is attached to and covers the surface of the chamfered structure, and the metal ball is sealed at the through hole under the tension of the metal wire; When the melt breaks, causing the metal wire to break, the elastic element resets and pulls the metal ball to trigger the micro switch to trigger an alarm. At the same time, the vent hole is connected to the inside of the outer tube through the mounting groove and the through hole to release air.

[0011] In one embodiment, the vaporization arc-extinguishing layer is made of a high-molecular gas-generating material. When the melt breaks and generates an electric arc, the vaporization arc-extinguishing layer decomposes instantly upon heating to generate high-pressure arc-extinguishing gas. The generated high-pressure arc-extinguishing gas forms a longitudinal airflow to cool the electric arc within the spiral groove of the labyrinth-type skeleton, and simultaneously causes the gas pressure inside the outer tube to rise sharply. The increased gas pressure acts on the metal ball at the through hole, helping to overcome the residual tension when the metal wire breaks, and accelerating the metal ball to retreat towards the exhaust hole, thereby achieving the instantaneous release of overload gas pressure.

[0012] In one embodiment, the surface of the metal ball has an arc-resistant conductive coating, and the spherical surface of the metal ball and the chamfered structure at the end of the through hole form an airtight spherical seal. Under normal operating conditions, the electrical connector is clamped between the metal ball and the chamfered structure, and the metal ball simultaneously performs the dual functions of electrical conduction and sealing of the quartz sand and gas inside the outer tube. Under venting conditions, the metal ball retracts, and the expanding gas inside the outer tube is directed through the spherical surface of the metal ball and injected directionally from the vent hole via the mounting groove.

[0013] The above-described technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: The anti-ferromagnetic resonance combined voltage transformer with fuse provided in this embodiment of the invention uses a vaporized arc-extinguishing layer on a labyrinth-type frame. When the melt melts and generates an electric arc, the gas is instantly decomposed by heat to generate high-pressure arc-extinguishing gas, which forms a longitudinal airflow in the spiral groove to cool the electric arc, and achieves efficient arc extinguishing by utilizing the dynamic effect of the airflow.

[0014] In addition, multiple narrow necks are formed by the holes in the melt, which melt simultaneously in case of overload or short circuit, dividing the long arc into multiple short arcs in series. Combined with the physical isolation of the labyrinthine spiral grooves, it achieves an excellent segmented arc extinguishing effect.

[0015] Finally, by setting up a striker action mechanism, not only can the metal ball be pulled by the elastic element to trigger the micro switch to realize the alarm when the fuse blows, but it can also open the exhaust port in conjunction with the metal ball to accelerate the retraction of the metal ball, thereby realizing the instantaneous directional release of the overload pressure inside the transformer, which greatly improves the safety of the equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the anti-ferromagnetic resonance combined voltage transformer with fuse provided in an embodiment of the present invention; Figure 2 This is an internal schematic diagram of an anti-ferromagnetic resonance combined voltage transformer with a fuse provided in an embodiment of the present invention; Figure 3 This is a cross-sectional view of a combined voltage transformer with fuse and anti-ferromagnetic resonance provided in an embodiment of the present invention. Figure 4 A cross-sectional view of a fuse in normal operating condition provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the striking pin action mechanism under normal operating conditions provided in an embodiment of the present invention; Figure 6 This is a cross-sectional view of a fuse for fusible protection provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the striking pin action mechanism for fuse protection provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the melt structure provided in an embodiment of the present invention.

[0018] The labels for the various figures are as follows: 1. Base; 2. Main voltage transformer; 3. Zero-sequence voltage transformer; 4. Fuse; 5. Insulating shell; 41. Outer tube; 42. End cap; 43. Metal terminal; 44. Labyrinth frame; 45. Fusible element; 46. Quartz sand filling layer; 421. Vent hole; 451. Hole; 471. Mounting slot; 472. Electrical connection piece; 473. Metal pull wire; 474. Metal ball; 475. Elastic element; 476. Micro switch; 4711. Through hole. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Please see Figures 1 to 3This application provides a three-phase five-limb voltage transformer with ferroresonant protection and a fuse 4. It mainly includes a base 1, preferably made of hot-dip galvanized anti-corrosion channel steel or high-strength aluminum alloy to ensure structural stability under outdoor and complex working conditions; three main voltage transformers 2; a zero-sequence voltage transformer 3; and a fuse 4. The three main voltage transformers 2 are arranged parallel to each other and side-by-side on the base 1. The zero-sequence voltage transformer 3 is located on the same side of the arrangement direction of the three main voltage transformers 2 and is mounted on the base 1 together with the three main voltage transformers 2, forming a compact combined structure.

[0024] Specifically, three fuses 4 are provided, each corresponding to one of the three main voltage transformers 2. One end of each fuse 4 is conductively connected to the high-voltage side of the main voltage transformer 2 to provide overload and short-circuit protection. Specifically, each of the three main voltage transformers 2 has an independent high-voltage terminal block (vacuum-cast using high-purity epoxy resin with anti-tracking properties) insulated enclosure on its top. In this embodiment, the three fuses 4 are placed outside the insulating shell 5 of the main voltage transformer 2. One end of each fuse 4 is horizontally fixed to the corresponding high-voltage terminal block of the main voltage transformer 2 via a metal connector (specifically, a copper busbar with high conductivity and tin or silver plating for oxidation prevention). The other end is suspended or supported by an independent insulating support. This allows the end cap 42 of the fuse 4 to be directly exposed to the external environment, significantly improving the heat dissipation of the fuse 4 and providing an unobstructed channel for directional venting and pressure relief in case of a fault, while also facilitating subsequent maintenance and replacement.

[0025] Please see Figure 4 and Figure 8 The fuse 4 has a precise internal structure, including an outer tube 41, end caps 42, metal terminals 43, a labyrinth-type frame 44, a fusible element 45, and a quartz sand filling layer 46. The outer tube 41 is made of epoxy resin fiberglass tubing, possessing excellent mechanical strength and insulation withstand voltage performance. The end caps 42 are made of insulating material and are sealed and fixed to both ends of the outer tube 41. Specifically, the end caps 42 can be made of high-temperature resistant, arc-resistant polytetrafluoroethylene (PTFE) or high-strength flame-retardant engineering plastic. The metal terminals 43 are located on the end caps 42 for external electrical connection. The metal terminals 43 can be made of pure copper with a silver-plated surface to minimize contact resistance and improve oxidation resistance.

[0026] The core labyrinthine skeleton 44 inside the outer tube 41 is made of high-temperature resistant ceramic (such as 95% or 99% alumina ceramic, which has extremely high thermal stability and mechanical strength), and has a cylindrical structure with unique spiral grooves on its surface. The skeleton is fixed at both ends to metal terminals 43. The molten material 45 is installed within these spiral grooves, forming a spiral strip, and its two ends are electrically connected to the metal terminals 43. The molten material 45 can specifically be a pure silver strip or a silver-copper alloy strip. Furthermore, several holes 451 are evenly distributed along the length of the molten material 45, and these holes 451 artificially create multiple narrow necks along the width of the molten material 45. In addition, the groove surface of the skeleton body is covered with a vaporization arc-extinguishing layer, which is made of a high-molecular gas-generating material, such as polyoxymethylene (POM) or melamine urate, which can rapidly decompose at the high temperature of the electric arc to produce a large amount of non-flammable gas. Finally, the quartz sand filling layer 46 densely fills the inside of the outer tube 41, completely covering the labyrinth skeleton 44 and the melt 45, serving as the main physical cooling and insulation medium.

[0027] Please see Figure 5 The fuse 4 has an integrated striker mechanism at the end cap 42 for fault alarm and assisting in venting and depressurization. The mechanism includes a mounting groove 471 inside the end cap 42, one end of which has a through hole 4711, and the end cap 42 also has a vent hole 421 that connects the mounting groove 471 to the external environment.

[0028] Inside the mounting groove 471, an electrical connector 472 is fixedly installed, which is connected to a metal terminal 43 on the same side via a connecting wire. One end of a metal pull wire 473 is connected to the metal terminal 43 on the opposite side, and the other end extends through the through hole 4711 into the mounting groove 471, and is fixedly connected to a movable metal ball 474. The surface of the metal ball 474 has an arc-resistant conductive plating. The end of the through hole 4711 near the mounting groove 471 has a chamfered structure, and the electrical connector 472 fits and covers the chamfered structure surface. In addition, the mounting groove 471 also has an elastic element 475 (such as a spring) with one end fixed to the inner wall and the other end connected to the metal ball 474, and a micro switch 476 adjacent to the movement trajectory of the metal ball 474.

[0029] Specifically, the electrical connector 472 can be made of beryllium bronze or copper sheet, which has good elasticity and high conductivity. The metal wire 473 can be made of high-resistance nickel-chromium alloy wire or fine tungsten wire, which has high tensile strength and can reliably melt under specific fault currents. The metal ball 474 can be a high-hardness stainless steel ball, and the conductive coating on its surface can be a silver plating layer.

[0030] In normal working condition, such as Figure 4 and Figure 5As shown, during normal operation of the equipment, the metal wire 473 is in a taut state, overcoming the tension of the elastic element 475 and tightly pulling the metal ball 474 against the electrical connector 472. In this state, the metal wire 473 and the spiral melt 45 form a parallel conductive circuit. Simultaneously, because the metal ball 474 is taut, its spherical surface forms an airtight spherical seal with the chamfered structure at the end of the through hole 4711, sealing the through hole 4711. The electrical connector 472 is clamped between the metal ball 474 and the chamfered structure, enabling the metal ball 474 to both achieve electrical conduction and seal the quartz sand and gas inside the outer tube 41, preventing the internal medium from becoming damp or leaking.

[0031] When the faulty fuse 4 blows, if an overload or short circuit occurs in the circuit containing the voltage transformer, causing a surge in current, such as... Figure 6 and Figure 7 As shown: When a large current passes through the melt 45, multiple narrow necks with small cross-sectional areas heat up and melt simultaneously, instantly dividing the originally large, long electric arc into multiple short arcs connected in series. At this time, the spiral grooves of the labyrinth-like skeleton 44 not only physically isolate these short arcs, limiting their spread, but the high temperature of the arc also causes the vaporized arc-extinguishing layer on the surface of the grooves to decompose instantly, generating high-pressure arc-extinguishing gas. Under the constraint of the spiral grooves, these gases form a strong longitudinal airflow, rapidly cooling the arc and achieving a highly efficient arc-extinguishing effect.

[0032] As the main melt element 45 melts, the parallel metal pull wire 473 also melts instantly due to bearing all the current. At this time, the metal ball 474 loses its tension, the elastic element 475 quickly resets and pulls the metal ball 474 backward, triggering the micro switch 476 in the backward trajectory, sending an action alarm signal to the control system.

[0033] Furthermore, the large amount of high-pressure gas generated by the vaporization arc-extinguishing layer causes a sharp increase in the gas pressure inside the outer tube 41. This increased gas pressure acts directly on the metal ball 474 at the through hole 4711, helping to overcome the residual tension when the metal wire 473 breaks, and significantly accelerating the retreat speed of the metal ball 474 towards the exhaust hole 421. After the metal ball 474 retreats, the original seal is broken, and the exhaust hole 421 is instantly connected to the inside of the outer tube 41 through the mounting groove 471 and the through hole 4711. The high-pressure expanding gas inside the outer tube 41 uses the smooth spherical surface of the metal ball 474 as a guide surface, smoothly and directionally ejected from the exhaust hole 421 through the mounting groove 471 to the external environment, instantly releasing the overload gas pressure. This solves the danger of tube explosion that is prone to occur when traditional sealed fuses 4 interrupt large short-circuit currents, greatly improving the reliability and safety of equipment operation.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined voltage transformer with fracturing circuit breaker and anti-ferromagnetic resonance, characterized in that, The ferroresonant-resistant three-phase five-limb voltage transformer with fuse includes: Base; Three main voltage transformers are arranged parallel to each other and side by side on the base. A zero-sequence voltage transformer is disposed on the same side of the arrangement direction of the three main voltage transformers and is mounted on the base together with the three main voltage transformers. A fuse is provided, which is connected to the main voltage transformer. There are three fuses, each corresponding to one of the three main voltage transformers, and one end of each fuse is conductively connected to the high-voltage side of the main voltage transformer.

2. The anti-ferromagnetic resonance combined voltage transformer with fuse according to claim 1, characterized in that: Each of the three main voltage transformers has an independent high-voltage terminal block insulated on its top. The three fuses are located outside the insulating shell of the main voltage transformers. One end of each fuse is horizontally fixed to the high-voltage terminal block of the corresponding main voltage transformer by a metal connector, while the other end is suspended or supported by an independent insulating support. The end caps of the fuses are directly exposed to the external environment.

3. A combined voltage transformer with fuse and anti-ferromagnetic resonance as described in claim 1, characterized in that, The fuse includes: The outer tube is an epoxy resin fiberglass pipe; End caps, which are sealed and fixed to both ends of the outer tube, are made of insulating material; Metal terminals are disposed on the end cap; A labyrinth-type frame, wherein the labyrinth-type frame is located inside the outer tube, and both ends of the labyrinth-type frame are fixed to the metal terminals; A melt, which is mounted on the labyrinth-like frame, with both ends of the melt electrically connected to the metal terminals; A quartz sand filling layer is densely filled inside the outer tube and covers the labyrinth skeleton and the melt.

4. A combined voltage transformer with fuse and anti-ferromagnetic resonance as described in claim 3, characterized in that, The labyrinthine skeleton includes: The skeleton body has a cylindrical structure and a spiral groove on its surface. The melt is located in the groove. The skeleton body is made of high-temperature resistant ceramic. A vaporization arc-extinguishing layer is provided, which covers the surface of the groove. The vaporization arc-extinguishing layer is used to vaporize when the melt breaks and generates an electric arc, so as to extinguish the arc by utilizing the dynamic effect of the airflow.

5. A combined voltage transformer with fuse and anti-ferromagnetic resonance as described in claim 4, characterized in that: The melt is in the shape of a spiral strip, and several holes are evenly distributed along its length. The holes distributed on the melt form multiple narrow necks in the width direction of the melt; when an overload or short-circuit current passes through, multiple necks melt simultaneously, dividing the single cutting arc into multiple short arcs connected in series; the spiral grooves of the labyrinth-like skeleton physically isolate the short arcs to cooperate with the vaporized arc-extinguishing layer for segmented arc extinguishing.

6. A combined voltage transformer with fuse and anti-ferromagnetic resonance as described in claim 3, characterized in that, The fuse further includes a striking pin actuation mechanism, which includes: The mounting groove is formed inside the end cap, and one end of the mounting groove has a through hole; An electrical connector is fixedly disposed in the mounting groove, and the electrical connector is connected to the metal terminal on the same side via a connecting wire; A metal wire, one end of which is connected to the metal terminal on the opposite side, and the other end extends through the through hole into the mounting groove; A metal ball, which is movably disposed in the mounting groove and fixedly connected to the other end of the metal wire; An elastic element is disposed in the mounting groove, one end of which is fixed to the inner wall of the mounting groove, and the other end is connected to the metal ball. A micro switch, which is fixed to the inner wall of the mounting groove and positioned adjacent to the movement trajectory of the metal ball; In normal operation, the metal wire overcomes the tension of the elastic element, pulls the metal ball tight, and abuts it against the electrical connection piece, so that the metal wire and the molten material form a parallel circuit.

7. A combined voltage transformer with fuse and anti-ferromagnetic resonance as described in claim 6, characterized in that: The end cap is also provided with a vent hole, which connects the mounting groove to the external environment of the fuse; the end of the through hole near the mounting groove has a chamfered structure, the electrical connection piece is attached to and covers the surface of the chamfered structure, and the metal ball is sealed at the through hole under the tension of the metal wire. When the melt breaks, causing the metal wire to break, the elastic element resets and pulls the metal ball to trigger the micro switch to trigger an alarm. At the same time, the vent hole is connected to the inside of the outer tube through the mounting groove and the through hole to release air.

8. A combined voltage transformer with fuse and anti-ferromagnetic resonance as described in claim 7, characterized in that: The vaporization arc-extinguishing layer is made of a high-molecular gas-generating material. When the melt breaks and generates an electric arc, the vaporization arc-extinguishing layer decomposes instantly upon heating to generate high-pressure arc-extinguishing gas. The generated high-pressure arc-extinguishing gas forms a longitudinal airflow to cool the electric arc within the spiral groove of the labyrinth-type skeleton, and on the other hand, causes the gas pressure inside the outer tube to rise sharply. The increased gas pressure acts on the metal ball at the through hole, helping to overcome the residual tension when the metal wire breaks, and accelerating the metal ball to retreat towards the exhaust hole, thereby achieving the instantaneous release of overload gas pressure.

9. A combined voltage transformer with fuse and anti-ferromagnetic resonance as described in claim 7, characterized in that: The surface of the metal ball has an arc-resistant conductive coating, and the spherical surface of the metal ball and the chamfered structure at the end of the through hole form an airtight spherical seal. Under normal operating conditions, the electrical connector is clamped between the metal ball and the chamfered structure, and the metal ball simultaneously performs the dual functions of electrical conduction and sealing of the quartz sand and gas inside the outer tube. Under venting conditions, the metal ball retracts, and the expanding gas inside the outer tube is directed through the spherical surface of the metal ball and injected directionally from the vent hole via the mounting groove.

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