Excitation fuse structure with closely arranged melts

Abstract

The utility model discloses an excitation fuse structure with closely arranged melts. The excitation fuse structure comprises a shell, an electronic ignition device, a piston, a first conducting bar and a second conducting bar, the conducting bars are arranged in the displacement direction of the piston at intervals in an insulated and staggered mode. The piston is provided with impact ends corresponding to the first conducting bar and the second conducting bar. Each conducting bar is connected with a melt in parallel, arc extinguishing chambers are arranged between the first conducting bar and the second conducting bar and between the periphery of the piston displacement path and the outer side wall of the shell, and the arc extinguishing chambers are arranged at intervals up and down or side by side; in the melts connected in parallel on the first conducting bar and the second conducting bar, at least one of the melts is arranged in the arc extinguishing chamber in a penetrating manner; when the electronic ignition device releases driving force to drive the piston to displace, the melt is fused after the piston disconnects the conducting bar. The fuse bodies connected in parallel with the conducting bar are densely arranged between the periphery of the displacement path of the piston and the outer side wall of the shell, so that the excitation fuse is more compact in structure, smaller in size and better in arc extinguishing capacity.

Description

Technical Field

[0001] The present invention relates to the fields of power control and electric vehicles, and in particular to a melt closely arranged excitation fuse structure for current interruption and arc extinguishing capacity improvement. Background Art

[0002] At present, a relatively mature excitation fuse product already exists in the market, which interrupts the circuit in a mechanical disconnection manner. Its general structure composition is: an upper housing, a conductive busbar, and a lower housing arranged in sequence. An electronic ignition device and a piston are sequentially arranged in the upper housing. A melt inner shell and a melt outer cover are arranged in the lower housing. A melt is inserted between the melt inner shell and the melt outer cover, and the melt is connected in parallel to the conductive busbar. A melt upper cutter and a melt lower cutter for clamping the melt are arranged in the melt inner shell and the melt outer shell. A melt cutter push plate is arranged at one end of the melt upper cutter. A pre-break port is arranged on the conductive busbar. Both ends of the melt are connected in parallel to both sides of the pre-break port of the conductive busbar.

[0003] The working principle is as follows: The excitation fuse is connected in series in the circuit. When the vehicle is in a normal working state, the current flows through the conductive busbar of the excitation fuse, and the product can be regarded as a conductor. When the vehicle is in an abnormal working state and needs to cut off the circuit, the vehicle control system sends a specified electrical signal to the electronic ignition device. The electronic ignition device triggers and releases high-pressure gas, which pushes the piston downward to break the pre-break port of the conductive busbar, forming a physical break port. Then the current flows through the melt connected in parallel to the conductive busbar. Subsequently, the piston pushes the melt cutter push plate to displace, and the melt cutter push plate pushes the melt upper and lower cutters to displace, thereby cutting off the melt and completely cutting off the circuit. Although the performance of this excitation fuse has been improved compared with that of the thermal fuse, there are still the following deficiencies: Since the existing excitation fuse has a large volume and the conductive busbar is mostly single-circuit, it cannot adapt to some relatively complex circuit conditions; the melt structure requires too much space. When the number of parallel melts increases, the overall volume of the excitation fuse increases significantly, and at the same time, the weight and size of the excitation fuse increase. Summary of the Invention

[0004] The purpose of the present invention is to provide a melt closely arranged excitation fuse structure. Through reasonable design of the spatial positions of the conductive busbar and multiple parallel melts, the existing space inside the excitation fuse housing is fully utilized to make its structure more compact and the volume smaller, realizing the miniaturization and light weight of the excitation fuse.

[0005] To achieve the above object, a melt closely arranged type excitation fuse structure of the present invention includes a housing, and an electronic ignition device, a piston, and a conductive bar located in the housing. The conductive bar includes a first conductive bar and a second conductive bar; the first conductive bar and the second conductive bar are insulated and spaced apart and arranged in a staggered manner in the piston displacement direction; the piston is provided with impact ends corresponding to the first conductive bar and the second conductive bar, and the cavity where the driving force release end of the electronic ignition device is located communicates with the cavity where one end of the piston facing the electronic ignition device is located; melts are connected in parallel to both the first conductive bar and the second conductive bar, and arc extinguishing chambers are respectively arranged in the part of the housing between the first conductive bar and the second conductive bar. The arc extinguishing chambers are located between the outer periphery of the piston displacement path and the outer side wall of the housing. In the piston displacement direction, the arc extinguishing chambers are arranged at intervals up and down or side by side; among the melts connected in parallel to the first conductive bar and the second conductive bar, at least one melt penetrates through the arc extinguishing chamber between the first conductive bar and the second conductive bar; when the electronic ignition device releases the driving force to drive the piston to displace, after the piston disconnects the conductive bar, the melt fuses.

[0006] Preferably, when the arc extinguishing chambers are arranged at intervals up and down, the arc extinguishing chambers are respectively located on opposite sides of the piston displacement path.

[0007] Preferably, the first conductive bar and / or the second conductive bar are respectively connected in parallel with the melt on one side or both sides in the piston displacement direction. When the melt is connected in parallel to one side of the first conductive bar and / or the second conductive bar, the melt is arranged in the arc extinguishing chamber between the first conductive bar and the second conductive bar; when the melt is connected in parallel to both sides of the first conductive bar and / or the second conductive bar, arc extinguishing chambers are respectively arranged between the outer periphery of the piston displacement path and the outer side wall of the housing on both sides of the first conductive bar and / or the second conductive bar. The melts located on both sides of the first conductive bar and / or the second conductive bar respectively penetrate through the arc extinguishing chambers on both sides of the corresponding first conductive bar and / or the second conductive bar.

[0008] Preferably, a third conductive bar is further included. The first conductive bar, the second conductive bar, and the third conductive bar are sequentially insulated and spaced apart and are arranged in a staggered manner in the piston displacement direction. Impact ends corresponding to the first conductive bar, the second conductive bar, and the third conductive bar are provided on the piston. A melt is connected in parallel on one side or both sides of the third conductive bar in the piston displacement direction. When the melt is connected in parallel on one side of the third conductive bar, an arc extinguishing chamber is provided in the housing between one side or both sides of the third conductive bar and the outer side wall of the housing, and on the outer periphery of the piston displacement path. When the melt is connected in parallel on one side of the third conductive bar, the melt penetrates through the corresponding arc extinguishing chamber between the second conductive bar and the third conductive bar. When the melt is connected in parallel on both sides of the third conductive bar, the melts respectively penetrate through the corresponding arc extinguishing chambers on both sides of the third conductive bar.

[0009] Preferably, the housing includes an excitation source protective sleeve, a first housing, a second housing, and a third housing which are sequentially arranged. The first conductive bar penetrates between the first housing and the second housing, and the second conductive bar penetrates between the second housing and the third housing. The first conductive bar and the second conductive bar are insulated and arranged in a staggered manner. The piston is provided with a first impact end and a second impact end. The first impact end corresponds to the first conductive bar, and the second impact end corresponds to the second conductive bar. When a melt is connected in parallel to each of the first conductive bar and the second conductive bar, arc extinguishing chambers are respectively provided at both ends of the second housing between the first conductive bar and the second conductive bar. The melts connected in parallel to the first conductive bar and the second conductive bar respectively penetrate through the corresponding arc extinguishing chambers.

[0010] Preferably, a first arc extinguishing groove and a second arc extinguishing groove are respectively provided on the end faces of the second housing between the first conductive bar and the second conductive bar. The open ends of the first arc extinguishing groove and the second arc extinguishing groove are respectively sealed by a first sealing cover plate and a second sealing cover plate to form a first arc extinguishing chamber and a second arc extinguishing chamber. A filling hole communicating with the first arc extinguishing chamber is provided on the first sealing cover plate, and a filling hole communicating with the second arc extinguishing chamber is provided on the end face of the second housing close to the first conductive bar. The filling hole is blocked by a sealing plug. The melt connected in parallel to the first conductive bar penetrates through the first arc extinguishing chamber, and the melt connected in parallel to the second conductive bar penetrates through the second arc extinguishing chamber.

[0011] Preferably, the arc extinguishing chamber is an arc-shaped structure, and the melt is an arc-shaped structure matching the arc extinguishing chamber.

[0012] Preferably, a sealing ring is provided between the contacting surfaces of the excitation source protective sleeve, the first housing, the second housing, and the third housing, and silica gel is filled for sealing.

[0013] Preferably, the conductive bars of each path are arranged opposite to each other. The part of the conductive bar located inside the housing and corresponding to the impact end of the piston is provided with a narrow-neck structure, and the narrow-neck structures of the conductive bars of each path are arranged in a staggered manner.

[0014] Preferably, the lengths of the respective impact ends of the piston corresponding to the conductive bars are different.

[0015] In the excitation fuse structure of the present invention, by connecting fuses in parallel on at least two conductive bars, and arranging the fuses densely on the outer periphery of the piston displacement path, and on one side or both sides of the conductive bars in parallel therewith, preferably arranging the jointly actuated fuses densely in the arc extinguishing chamber between the conductive bars, the existing housing space of the excitation fuse is fully utilized, while improving the arc extinguishing ability of the excitation fuse, without increasing the volume of the excitation fuse, making the excitation fuse structure of the same specification more compact, smaller in volume, and lighter in weight.

[0016] When using more than two conductive bars, the conductive bars are arranged opposite to each other. The conductive bars are designed with a narrow-neck structure inside the housing, and the narrow-neck structures of the two conductive bars are designed in a staggered manner, so that the two conductive bars can be simultaneously disconnected from the narrow-neck structure by the piston, and the conductive bars of more than two paths are disconnected and insulated from each other without interference. Further, the volume of the excitation fuse is made smaller and more compact, and the simultaneous on-off of multiple circuits can be achieved.

[0017] The current flows through both ends of the conductive bar connected in series in the protection system loop, which will not cause adverse effects on the fuses connected in parallel. And because the cross-section of the conductive bar is large and the resistance is small, the current impact resistance is good.

[0018] Through the sealed design of the excitation fuse housing, there are no vent holes, which can prevent foreign objects from contaminating the fracture, and can also prevent the high-temperature arc from spraying out of the housing and damaging the surrounding devices, improving the protection level. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the principle structure of the excitation fuse.

[0020] Figure 2 is a schematic diagram of the principle structure of the excitation fuse.

[0021] Figure 3 is a sectional view of the excitation fuse along the length direction of the conductive bar.

[0022] Figure 4 is a sectional view of the excitation fuse along the direction perpendicular to the conductive bar.

[0023] Figure 5 It is a schematic diagram of the structural relationship between the conductive busbar and the sealing cover plate.

[0024] Figure 6 It is a schematic cross-sectional view of the structural relationship between the second housing and the conductive busbar.

[0025] Figure 7 It is a schematic diagram of the sealing cover plate structure.

[0026] Figure 8 It is a schematic diagram of the misaligned arrangement of the narrow neck structures of the first conductive busbar and the second conductive busbar located inside the housing.

[0027] Figure 9 It is a schematic diagram of the piston structure.

[0028] Reference numerals:

[0029] Housing 100, excitation source protection sleeve 101, first housing 102, second housing 103, first arc-shaped groove 103a, second arc-shaped groove 103b, third housing 104, excitation source 105, piston 106, first impact end 106a, second impact end 106b, limit bump 106c, sealing groove 106d, first conductive busbar 107, narrow neck structure 107a, second conductive busbar 108, narrow neck structure 108a, first fuse melt 109, second fuse melt 110, first sealing cover plate 114, second sealing cover plate 115, filling hole 116, filling hole 117. Detailed implementation manners

[0030] The melt closely arranged type excitation fuse structure of the present invention is characterized in that it includes a housing, and an electronic ignition device, a piston, and a conductive busbar located in the housing. The conductive busbar includes a first conductive busbar and a second conductive busbar. The first conductive busbar and the second conductive busbar are insulated and spaced apart and misaligned in the piston displacement direction. The piston is provided with impact ends corresponding to the first conductive busbar and the second conductive busbar. The cavity where the driving force release end of the electronic ignition device is located communicates with the cavity where one end of the piston facing the electronic ignition device is located. Melts are connected in parallel to both the first conductive busbar and the second conductive busbar. Arc extinguishing chambers are respectively arranged in the housing part between the first conductive busbar and the second conductive busbar. The arc extinguishing chambers are located between the outer circumference of the piston displacement path and the outer side wall of the housing. In the piston displacement direction, the arc extinguishing chambers are arranged at intervals up and down or side by side at intervals. Among the melts connected in parallel to the first conductive busbar and the second conductive busbar, at least one melt penetrates through the arc extinguishing chamber between the first conductive busbar and the second conductive busbar. When the electronic ignition device releases the driving force to drive the piston to displace, after the piston disconnects the conductive busbar, the melt fuses.

[0031] See Figure 1, the busbar is arranged in two paths, including a housing 100, in which an excitation source 105, a piston 106, a first busbar 107 and a second busbar 108 are arranged. The first busbar 107 and the second busbar 108 are arranged at an insulating interval in the piston displacement direction. The first busbar 107 and the second busbar 108 located inside the housing and corresponding to the impact end of the piston are partially misaligned. When the piston disconnects the first busbar 107 and the second busbar 108, they do not interfere with each other. A first fuse 109 is connected in parallel on the first busbar 107, and a second fuse 110 is connected in parallel on the second busbar 108. In the housing 100 between the first busbar 107 and the second busbar 108 and between the outer periphery of the displacement path of the piston 106 and the outer side wall of the housing 100, arc extinguishing chambers corresponding to the first fuse 109 and the second fuse 110 are arranged respectively. The two arc extinguishing chambers are arranged at an upper and lower interval or side by side at an interval. When arranged at an upper and lower interval, the two arc extinguishing chambers are respectively located on the opposite outer sides of the piston displacement path. An arc extinguishing medium is filled in the arc extinguishing chamber. Preferably, the arc extinguishing medium is solid quartz sand. The first fuse 109 and the second fuse 110 are respectively arranged through the corresponding arc extinguishing chambers.

[0032] Figure 1 In the structure, the fuses connected in parallel on the first busbar 107 and the second busbar 108 are arranged closely between the first busbar 107 and the second busbar 108, and the existing space between the outer periphery of the piston displacement path and the outer side wall of the housing is fully utilized. Since the housing space around the outer periphery of the piston displacement path is an annular structure, in order to make the best use of the existing housing space, the shapes of the arc extinguishing chambers and the first fuse and the second fuse are also set to be matching arc structures.

[0033] Figure 2 is based on Figure 1 On this basis, the first fuse 109 and the second fuse 110 are respectively connected in parallel on the two sides of the first busbar 107 and the second busbar 108 in the piston displacement direction. That is to say, two first fuses 109 and two second fuses 110 are respectively connected in parallel on the first busbar 107 and the second busbar 108. Arc extinguishing chambers are respectively arranged in the housing where the upper and lower sides of the first busbar 107 and the second busbar 108 are located in the piston displacement direction. That is, two arc extinguishing chambers for the first fuse 109 to pass through are respectively arranged in the housing where the upper and lower sides of the first busbar 107 are located, and two arc extinguishing chambers for the second fuse 110 to pass through are respectively arranged in the housing where the upper and lower sides of the second busbar 108 are located. All the arc extinguishing chambers are located in the housing between the outer side of the piston displacement path and the outer side wall of the housing. Figure 2 The structure can better distribute the fuses and can use the existing housing space to arrange more fuses connected in parallel with the busbar.

[0034] The following are preferred embodiments and specific descriptions will be made in conjunction with the drawings. The directional terms involved are only based on the directions shown in the drawings and do not constitute a limitation on the technical solutions of the present invention.

[0035] Specifically, two busbars are used, and one fuse element is connected in parallel to each busbar. That is, specific examples will be given and detailed descriptions will be made based on the principle of Figure 1 .

[0036] Referring to Figures 3 to 9 , the excitation fuse of the present invention mainly includes an excitation source protective sleeve 101, a first housing 102, a second housing 103, a third housing 104, an excitation source 105, a piston 106, a first busbar 107, a second busbar 108, a first fuse element 109, and a second fuse element 110, where:

[0037] The excitation source protective sleeve 101, the first housing 102, the second housing 103, and the third housing 104 are sequentially butted to form an excitation fuse housing. The excitation fuse housing is designed to be sealed without air vents. Therefore, sealing rings are provided at the contact surfaces of the parts of the excitation source protective sleeve 101, the first housing 102, the second housing 103, and the third housing 104 that cooperate with each other, and are filled with silica gel to ensure excellent sealing performance. This can not only prevent foreign objects from contaminating the fracture, but also prevent high-temperature electric arcs from spraying out of the housing and damaging surrounding devices.

[0038] Interconnected cavities for installing the excitation source, the piston, and for the piston to displace are respectively provided in the excitation source protective sleeve 101, the first housing 102, the second housing 103, and the third housing 104.

[0039] The excitation source 105 is an electronic igniter that can act under the action of a trigger signal and release high-pressure gas as a driving force. The excitation source 105 is arranged in the cavity in the excitation source protective sleeve 101 that matches it. The signal receiving end of the excitation source is located at one end of the cavity in the excitation source protective sleeve facing the outside of the excitation fuse housing. The driving force release end of the excitation source 105 faces the piston 106. An electrostatic ring and a short-circuit ring are installed at the signal receiving end of the excitation source 105. The short-circuit ring shorts the signal receiving end of the excitation source to prevent the excitation source from malfunctioning due to static electricity or other misoperations during the non-use state, such as during warehousing, transportation, and installation, resulting in the excitation fuse acting and causing the product to be scrapped.

[0040] The first conductive bar 107 is disposed between the first housing 102 and the second housing 103, and the second conductive bar 108 is disposed between the second housing 103 and the third housing 104. The second housing 103 is made of an insulating material to insulate and isolate the first conductive bar 107 and the second conductive bar 108. In order to save the space of the excitation fuse, in this embodiment, the first conductive bar 107 and the second conductive bar 108 are disposed opposite to each other. The two ends of the first conductive bar 107 and the second conductive bar 108 located outside the housing are respectively used as the connection terminals of the two paths of the excitation fuse. The portions of the first conductive bar 107 and the second conductive bar 108 that are located inside the housing and on the displacement path of the piston 106 are both provided with a narrow neck structure (107a, 108a), and the narrow neck structures (107a, 108a) of the first conductive bar 107 and the second conductive bar 108 are disposed in a staggered manner. The widths at the narrow neck structures (107a, 108a) are respectively smaller than the widths of the main bodies of the first conductive bar 107 and the second conductive bar 108. Disconnection weak points for reducing mechanical strength are respectively provided on the narrow neck structures (107a, 108a). The disconnection weak points can be various structural forms such as grooves, variable cross-section structures, overlaps, etc. In this embodiment, the disconnection weak points are grooves in the form of U-shaped, V-shaped or a combination thereof opened on one or both sides of the narrow neck structures (107a, 108a).

[0041] The piston 106 is installed in the cavity of the first housing 102. One end of the driving force release of the excitation source 105 is disposed corresponding to one end of the piston 106 facing the excitation source 105, and the cavity where the driving force release end of the excitation source 105 is located communicates with the cavity where one end of the piston 106 facing the excitation source 105 is located.

[0042] The piston 106, refer to Figure 9 , has two impact ends, namely a first impact end and a second impact end, and the two impact ends have different lengths and are disposed in a staggered manner. The first impact end is disposed corresponding to the disconnection weak point at the narrow neck structure 107a of the first conductive bar 107, and the second impact end is disposed corresponding to the disconnection weak point at the narrow neck structure 108a of the second conductive bar 108, that is, the narrow neck structure 107a of the first conductive bar 107 is located on the displacement path of the first impact end, and the narrow neck structure 108a of the second conductive bar 108 is located on the displacement path of the second impact end 106b. In the initial position, the first impact end 106a is located in the first housing 102, and the second impact end passes through the first housing 102 and is located in the second housing 103. A receiving groove for the disconnected part of the narrow neck structure of the first conductive bar 107 and the first impact end to enter is provided in the second housing 102, and a receiving groove for the disconnected part of the narrow neck structure of the second conductive bar 108 and the second impact end to enter is also provided on the third housing 103. When the first conductive bar and the second conductive bar are disconnected, they do not affect each other.

[0043] The two impact ends of the piston are set as a three-step structure, that is, the end of each impact end is set as a notch structure for positioning and cutting, and the bottom of the notch is the part that directly cuts the conductive bar. Therefore, the mechanical strength of the bottom of the notch is relatively large, and the structure of the bottom of the notch is also a structure that is convenient for force concentration, such as a prism shape, a blade shape, etc. The two sides of the bottom of the notch at the end of the impact end are respectively located on both sides of the width direction of the part where the conductive bar needs to be disconnected, which is convenient for ensuring that the conductive bar enters the notch structure of the impact end after the piston moves, forming positioning and guidance, and avoiding horizontal relative displacement between the narrow neck structure of the conductive bar and the impact end of the piston when cutting.

[0044] A sealing groove 106d is provided on the outer periphery of the piston head of the piston 106 facing the excitation source 105, and a sealing ring is provided in the sealing groove, so that the sealing piston 106 is in sealed contact with the inner wall of the cavity of the first shell 102. In other embodiments, the sealing can also be achieved by an interference fit between the piston and the first shell. Limiting protrusions 106c are formed integrally on opposite sides of the end surface of the piston 106 facing the excitation source 105. When the piston 106 is installed, the limiting protrusion is located between the contact surface of the excitation source protection sleeve 101 and the first shell 102, forming an initial position limit for the piston 106.

[0045] A first arc-shaped groove 103a is provided on the end surface of the second housing 103 in contact with the first conductive row 107, and a first sealing cover plate 114 is provided at the open end of the first arc-shaped groove 103a. The first sealing cover plate 114 is an arc-shaped cover plate matching the first arc-shaped groove 103a. The first sealing cover plate 114 is clamped at the open end of the first arc-shaped groove 103a and seals it. The first sealing cover plate 114 and the first arc-shaped groove 103a form a sealed first arc-extinguishing chamber, and the first arc-extinguishing chamber is filled with an arc-extinguishing medium. A filling hole 116 for filling the arc-extinguishing medium is provided on the first sealing cover plate 114, and the arc-extinguishing medium in the first arc-extinguishing chamber is filled through the filling hole 116 on the first sealing cover plate 114. The first melt 109 is an arc-shaped filament structure, and the first melt 109 is inserted into the arc-extinguishing medium in the first arc-extinguishing chamber in an insulating manner. Both ends of the first melt 109 pass through the first arc-extinguishing chamber and are connected in parallel with the first conductive row 107.

[0046] A second arc-shaped groove 103b is provided on the end surface of the second shell 103 in contact with the second conductive row 108, and the open end of the second arc-shaped groove 103b faces the second conductive row 108. A second sealing cover plate 115 is provided at the open end of the second arc-shaped groove 103b, and the second sealing cover plate 115 is clamped on the open end of the second arc-shaped groove 103b and seals it. The second sealing cover plate 115 and the second arc-shaped groove 103b form a sealed second arc-extinguishing chamber, and the second arc-extinguishing chamber is filled with an arc-extinguishing medium. A filling hole 117 is provided on the second shell 103, which passes through the end surface of the second shell 103 facing the first conductive row 107 and the bottom of the second arc-shaped groove 103b, and the arc-extinguishing medium of the second arc-extinguishing chamber is filled through the filling hole 117. After the arc-extinguishing medium is filled, the filling holes (116, 117) are respectively blocked by sealing plugs.

[0047] The second fuse 110 is an arc-shaped filament structure. The second fuse 110 is arranged in an insulating manner through the arc extinguishing medium in the second arc extinguishing chamber. Both ends of the second fuse 110 pass through the second arc extinguishing chamber and are connected in parallel with the second conductive bar 108 .

[0048] The resistance of the first melt 109 and the second melt 110 is much greater than the resistance of the first conductive bar 107 and the second conductive bar 108 . When the current is normally flowing, most of the current flows through the first conductive bar 107 and the second conductive bar 108 , and only a weak current flows through the first melt 109 and the second melt 110 .

[0049] When in use, the first conductive bar 107 and the second conductive bar 108 are connected to one path respectively, so that the excitation fuse is connected to two paths at the same time. When used in a three-phase circuit, two phase circuits are connected at the same time to control the simultaneous on and off of the two phase circuits.

[0050] Working principle:

[0051] During normal operation, the first conductive bar 107 and the second conductive bar 108 are respectively connected to a circuit.

[0052] The excitation source 105 is actuated according to the received trigger signal, and releases high-pressure gas as a driving force. The high-pressure gas acts on the piston 106, disconnecting the piston 106 and the limiting protrusion, driving the piston 106 to move along the cavity of the first shell 102, and the first impact end and the second impact end of the piston 106 simultaneously disconnect the first conductive bar 107 and the second conductive bar 108. The current flowing through the first conductive bar 107 and the second conductive bar 108 flows through the first melt 109 and the second melt 110 connected in parallel therewith, and the first melt 109 and the second melt 110 are melted.

[0053] Arc extinguishing principle:

[0054] The first conductive bar 107 and the second conductive bar 108 are disconnected simultaneously. Since most of the current flows through the first fuse 109 and the second fuse 110 during disconnection, the arc is very small when the first conductive bar 107 and the second conductive bar 108 are disconnected. When the first fuse 109 and the second fuse 110 are blown, due to the current-limiting effect of the first fuse 109 and the second fuse 110, the arc generated during blowing is relatively small, and the arc is directly extinguished by the arc extinguishing medium.

[0055] In the above embodiment, the conductive bars are arranged in two paths. In other embodiments, the conductive bars can be arranged in one path or multiple paths. When arranged in multiple paths, the conductive bars are insulated from each other with intervals, and the corresponding positions of the impact ends of the piston need to be arranged in a staggered manner. There are more than two fuses connected in parallel on the conductive bars. For example, on the basis of the above embodiments, a third conductive bar is added. The first conductive bar, the second conductive bar, and the third conductive bar are insulated and spaced apart in a staggered manner along the piston displacement path in sequence. The piston corresponds to the third conductive bar, and the first conductive bar, the second conductive bar, and the third conductive bar are respectively provided with corresponding impact ends. On one side or both sides of the third conductive bar in the piston displacement direction, there are fuses connected in parallel.

[0056] When there is a fuse connected in parallel on one side of the third conductive bar, the fuse is preferably passed through the arc extinguishing chamber between the third conductive bar and the second conductive bar. The principle of setting the arc extinguishing chamber is the same as that of the above embodiment, that is, in the housing between the outer periphery of the piston displacement path and the outer side wall of the housing.

[0057] When there are fuses connected in parallel on both sides of the third conductive bar, arc extinguishing chambers are respectively opened on both sides of the third conductive bar in the housing between the outer periphery of the piston displacement path and the outer side wall of the housing, and the fuses connected in parallel on both sides of the third conductive bar are respectively passed through the corresponding arc extinguishing chambers. The arc extinguishing chamber for the fuse connected in parallel on the third conductive bar and located between the third conductive bar and the second conductive bar and the arc extinguishing chamber for the fuse connected in parallel on the third conductive bar and located between the third conductive bar and the second conductive bar can be arranged at intervals vertically or side by side in the piston displacement direction.

Claims

1. A tightly arranged fuse excitation fuse structure, characterized in that: The invention comprises a shell, an electronic ignition device, a piston and a conductive row in the shell, wherein the conductive row comprises a first conductive row and a second conductive row; the first conductive row and the second conductive row are insulated and spaced apart and staggered in the piston displacement direction; the piston is provided with impact ends corresponding to the first conductive row and the second conductive row, and the cavity where the driving force release end of the electronic ignition device is located is connected with the cavity where the end of the piston facing the electronic ignition device is located; the first conductive row and the second conductive row are both connected in parallel with a melt, and arc extinguishing chambers are respectively provided in the shell part between the first conductive row and the second conductive row, and the arc extinguishing chambers are located between the outer periphery of the piston displacement path and the outer side wall of the shell, and in the piston displacement direction, each arc extinguishing chamber is spaced apart up and down or spaced apart side by side; among the melts connected in parallel on the first conductive row and the second conductive row, at least one melt is arranged in the arc extinguishing chamber between the first conductive row and the second conductive row; when the electronic ignition device releases the driving force to drive the piston to displace, the melt is melted after the piston disconnects the conductive row.

2. The closely arranged fuse excitation fuse structure according to claim 1 is characterized in that: When the arc extinguishing chambers are arranged with an interval up and down, the arc extinguishing chambers are respectively located on two opposite sides of the piston displacement path.

3. The closely arranged fuse excitation fuse structure according to claim 1 is characterized in that: The first conductive bar and / or the second conductive bar are respectively connected in parallel with the melt on one side or both sides of the piston displacement direction. When the melt is connected in parallel on one side of the first conductive bar and / or the second conductive bar, the melt is arranged in the arc extinguishing chamber between the first conductive bar and the second conductive bar; when the melt is connected in parallel on both sides of the first conductive bar and / or the second conductive bar, the arc extinguishing chamber is respectively arranged on both sides of the first conductive bar and / or the second conductive bar, between the outer periphery of the piston displacement path and the outer side wall of the shell, and the melt located on both sides of the first conductive bar and / or the second conductive bar is respectively penetrated into the arc extinguishing chamber on both sides of the corresponding first conductive bar and / or the second conductive bar.

4. The closely arranged fuse excitation fuse structure according to claim 3 is characterized in that: It also includes a third conductive bar, wherein the first conductive bar, the second conductive bar and the third conductive bar are sequentially insulated and staggered in the direction of piston displacement; the piston is provided with impact ends corresponding to the first conductive bar, the second conductive bar and the third conductive bar; a melt is connected in parallel on one side or both sides of the third conductive bar in the direction of piston displacement; when the melt is connected in parallel on one side of the third conductive bar, the arc extinguishing chamber is provided in the shell on one side or both sides of the third conductive bar and between the outer periphery of the piston displacement path and the outer side wall of the shell, and when the melt is connected in parallel on one side of the third conductive bar, the melt is passed through the arc extinguishing chamber corresponding to the second conductive bar and the third conductive bar; when the melt is connected in parallel on both sides of the third conductive bar, the melt is respectively passed through the arc extinguishing chambers corresponding to the third conductive bar on both sides of the third conductive bar.

5. The closely arranged fuse excitation fuse structure according to claim 3 is characterized in that: The shell includes an excitation source protection cover, a first shell, a second shell, and a third shell which are arranged in sequence, the first conductive bar is inserted between the first shell and the second shell, and the second conductive bar is inserted between the second shell and the third shell; the first conductive bar is insulated from the second conductive bar and is staggered, the piston is provided with a first impact end and a second impact end, the first impact end is arranged corresponding to the first conductive bar, and the second impact end is arranged corresponding to the second conductive bar; when the first conductive bar and the second conductive bar are respectively connected in parallel with one of the melts, the arc extinguishing chambers are respectively arranged at both ends of the second shell between the first conductive bar and the second conductive bar, and the melts connected in parallel to the first conductive bar and the second conductive bar are respectively inserted into the arc extinguishing chambers corresponding thereto.

6. The closely arranged fuse excitation fuse structure according to claim 5, characterized in that: A first arc-extinguishing groove and a second arc-extinguishing groove are respectively arranged on the end surface of the second shell between the first conductive row and the second conductive row, and the opening ends of the first arc-extinguishing groove and the second arc-extinguishing groove are respectively sealed by a first sealing cover plate and a second sealing cover plate to form a first arc-extinguishing chamber and a second arc-extinguishing chamber respectively; a filling hole connected to the first arc-extinguishing chamber is opened on the first sealing cover plate, and a filling hole connected to the second arc-extinguishing chamber is opened on the end surface of the second shell close to the first conductive row; the filling hole is blocked by a sealing plug, and the melt connected in parallel to the first conductive row is passed through the first arc-extinguishing chamber, and the melt connected in parallel to the second conductive row is passed through the second arc-extinguishing chamber.

7. The closely arranged fuse excitation fuse structure according to claim 6, characterized in that: The arc extinguishing chamber is an arc-shaped structure, and the melt is an arc-shaped structure matching the arc extinguishing chamber.

8. The closely arranged fuse excitation fuse structure according to claim 5, characterized in that: A sealing ring is arranged between the contact surfaces of the excitation source protection cover, the first shell, the second shell, and the third shell and is filled with silica gel for sealing.

9. The closely arranged fuse excitation fuse structure according to any one of claims 1 to 8, characterized in that: The conductive bars of each path are arranged opposite to each other, and the conductive bar portion located inside the shell and corresponding to the impact end of the piston is arranged as a narrow neck structure, and the narrow neck structures of the conductive bars of each path are arranged in a staggered manner.

10. The closely arranged fuse excitation fuse structure according to claim 9, characterized in that: The lengths of the impact ends of the pistons corresponding to the conductive row are different.

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