A closed-type jet fuse

Abstract

The present invention relates to the technical field of fuses, and provides a closed type jet fuse, comprising: a porcelain bushing, which defines a cavity inside, and an upper terminal block and a lower terminal block are fixedly connected inside the cavity respectively. The upper terminal block is used for being electrically connected to a first external wire, and the lower terminal block is used for being electrically connected to a second external wire; a tube body, with a first contact and a second contact fixedly connected to both ends respectively. A connecting seat is arranged inside the cavity. One end of the tube body penetrates through the connecting seat and is clamped with the connecting seat. The tube body abuts against the inner wall of the cavity through the connecting seat, and the first contact contacts the upper terminal block, and the second contact contacts the lower terminal block; a communicating pipe, arranged on one side of the porcelain bushing and communicating with both ends of the cavity respectively. A closing assembly is arranged at one end of the tube body. When the fuse wire melts, the closing assembly opens the tube body to enable the tube body to communicate with one end of the adjacent communicating pipe. It can facilitate the installation of the tube body, ensure the contact effect between the contacts and the terminal blocks, and protect the structure of the porcelain bushing to extend its service life.

Description

Technical Field

[0001] The present invention relates to the technical field of fuses, and particularly to a closed jet fuse. Background Art

[0002] With the increasing progress of high-voltage products, the requirements for power grid transmission and distribution line products are gradually increasing. Conventional drop fuses cannot meet the conventional requirements, have a high failure rate, and pose a great safety hazard. Jet fuses can utilize the melting of their own fuse wire to form an arc, and a large amount of gas is generated by special materials in the tube body to blow out the arc, forming an electrical break to disconnect the circuit, effectively improving the use safety and the breaking effect, and are widely used.

[0003] However, for traditional closed jet fuses, the tube body needs to be rotated, and it is threadedly connected through a screw head and a porcelain bushing. After long-term replacement and use, the screw head and the porcelain bushing are prone to slipping threads, resulting in ineffective installation of the tube body, and the contact head and the terminal block cannot contact to form a path, causing the overall fuse to be unusable;

[0004] In addition, when a large amount of gas is generated in the tube body to blow out the arc, the porcelain bushing structure is also prone to structural bursting, breakage, etc. under the influence of air pressure, and the service life is relatively low. Therefore, there is an urgent need for a closed jet fuse to solve the above existing problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a closed jet fuse to solve the above problems existing in the prior art, which can achieve convenient installation of the tube body, ensure the contact effect between the contact head and the terminal block, and protect the porcelain bushing structure to extend the service life.

[0006] To achieve the above purpose, the present invention provides the following solutions: The present invention provides a closed jet fuse, including:

[0007] A porcelain bushing, with a cavity defined inside. An upper terminal block and a lower terminal block are fixedly connected inside the cavity. The upper terminal block is used for being electrically connected to a first external wire, and the lower terminal block is used for being electrically connected to a second external wire;

[0008] A tube body, with a first contact head and a second contact head fixedly connected to both ends respectively. The first contact head and the second contact head are electrically connected through a fuse wire;

[0009] A connection block, arranged inside the cavity. One end of the tube body penetrates through the connection block and is clamped with the connection block. The tube body abuts against the inner wall of the cavity through the connection block, and the first contact head contacts the upper terminal block, and the second contact head contacts the lower terminal block;

[0010] A communicating pipe is arranged on one side of the porcelain bushing and communicates with both ends of the cavity respectively. A closing component is arranged at one end of the pipe body. When the fuse melts, the closing component opens the pipe body to enable the pipe body to communicate with one end of the adjacent communicating pipe.

[0011] Preferably, the closing component includes:

[0012] A baffle plate is movably fitted at the bottom end of the pipe body. An elastic member is arranged in the pipe body. The baffle plate is connected to the fuse through the elastic member, and the baffle plate has an elastic tendency away from the pipe body direction. The baffle plate is used to block the opening at the bottom end of the pipe body.

[0013] Preferably, the elastic member includes:

[0014] A connecting column is slidably connected to the bottom end of the pipe body. Both ends of the fuse are fixedly connected to the first contact and the connecting column respectively. The bottom end of the connecting column is fixedly connected with the baffle plate. A first spring is sleeved on the connecting column, and both ends of the first spring abut against the bottom surface of the pipe body and the baffle plate respectively.

[0015] Preferably, a conductive seat is fixedly connected to the bottom side wall surface of the pipe body. The baffle plate abuts against the conductive seat through the fuse, and the outer side wall of the conductive seat is used to contact the lower wiring seat.

[0016] Preferably, it further includes:

[0017] An alarm is fixedly connected to the porcelain bushing. The bottom end of the porcelain bushing is detachably connected with an end cover. A trigger is arranged in the end cover. The trigger end of the trigger is fixedly connected to the bottom surface of the baffle plate, and the trigger is communicatively connected with the alarm.

[0018] Preferably, it further includes:

[0019] A support seat is fixedly connected to one side of the porcelain bushing. A limiting groove is opened in the support seat. One end of the connecting seat penetrates through the support seat and is fixedly connected with a pull ring. Limiting columns are fixedly connected to both sides of the connecting seat respectively. The limiting columns are slidably connected with the limiting groove. A second spring is fixedly connected to the bottom end of the limiting column. The end of the second spring away from the limiting column is fixedly connected with the support seat. The connecting seat has an elastic tendency in the vertical upward direction.

[0020] Preferably, the connecting seat is of an annular structure. A sliding groove is opened on the inner side wall of the top of the cavity. The connecting seat is slidably connected in the sliding groove. A clamping groove is opened on the inner side wall surface of the inner ring of the connecting seat. A clamping block is fixedly connected to the outer wall surface of the pipe body. The clamping block is slidably matched with the clamping groove and is distributed in a vertical offset manner.

[0021] Preferably, a supporting block is fixedly connected to the inner ring side of the connecting seat. An empty groove that slidably cooperates with the pipe body is formed in the center of the supporting block. Two clamping grooves are oppositely arranged along the inner wall surface of the empty groove. The supporting block is clamped with the clamping block.

[0022] Preferably, it further includes:

[0023] At least one buffer valve, which is arranged in the communicating pipe.

[0024] Preferably, a groove is formed in the inner wall of the top end of the cavity. The upper wiring seat is fixedly connected to the inner wall of the top end of the groove. A fixing seat is fixedly connected to the inner side wall of the groove. A positioning groove is formed in the center of the fixing seat. The first contact extends into the positioning groove and contacts the upper wiring seat.

[0025] The present invention discloses the following technical effects:

[0026] 1. In the present invention, the upper wiring seat and the lower wiring seat are respectively fixedly connected to the top end and the bottom end of the cavity. The upper wiring seat is energized through the first external wiring correspondingly, and the second external wiring is energized with the lower wiring seat. After the pipe body is placed in the cavity, only by contacting the first contact with the upper wiring seat and the second contact with the lower wiring seat, the connection between the enclosed jet fuse and the power grid line can be realized.

[0027] 2. By clamping the connecting seat arranged in the cavity with the pipe body, compared with the traditional method, the situation that the pipe body cannot be effectively connected when the thread connection slips after a long time is avoided. On the basis of the above clamping of the connecting seat and the pipe body, the pipe body also abuts against the inner wall of the cavity through the connecting seat, thus ensuring the connection stability between the pipe body and the porcelain bushing.

[0028] 3. By using the communicating pipe arranged on one side of the porcelain bushing, the two ends of the communicating pipe are respectively communicated with both sides of the porcelain bushing. At the same time, a closing component is arranged at one end of the pipe body, and the closing component can open one end of the pipe body when the fuse wire melts. A large amount of gas generated in the pipe body due to the melting of the fuse wire can be vented out through the opening end of the pipe body. During the gas flow process, the arc can be blown out, and the gas can flow along one end of the adjacent communicating pipe, avoiding the structural damage caused by the sudden formation of high-intensity air pressure in the porcelain bushing and effectively prolonging the service life of the porcelain bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1This is a structural cross-sectional view of the enclosed jet fuse of the present invention;

[0031] Figure 2 This is a positional relationship diagram of the connection seat and the pull ring in the present invention;

[0032] Figure 3 This is the main structural view of the tube body in the present invention;

[0033] Among them, 1. Porcelain sleeve; 2. Upper terminal block; 3. Lower terminal block; 4. First external connection; 5. Second external connection; 6. Tube body; 7. First contact; 8. Connection seat; 9. Connecting pipe; 10. Baffle; 11. Fuse wire; 12. Connecting column; 13. First spring; 14. Conductive seat; 15. Alarm; 16. End cover; 17. Trigger; 18. Support seat; 19. Pull ring; 20. Limit post; 21. Second spring; 22. Clamping block; 23. Supporting block; 24. Buffer valve; 25. Fixed seat. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0036] Referring to Figures 1 - 3 , the present invention provides an enclosed jet fuse, including:

[0037] A porcelain sleeve 1, with a cavity defined inside. An upper terminal block 2 and a lower terminal block 3 are fixedly connected inside the cavity. The upper terminal block 2 is used for electrically connecting with the first external connection 4, and the lower terminal block 3 is used for electrically connecting with the second external connection 5;

[0038] A tube body 6, with a first contact 7 and a second contact fixedly connected to both ends respectively. The first contact 7 and the second contact are electrically connected through a fuse wire 11;

[0039] A connection seat 8, arranged inside the cavity. One end of the tube body 6 penetrates through the connection seat 8 and is clamped with the connection seat 8. The tube body 6 abuts against the inner wall of the cavity through the connection seat 8, and the first contact 7 contacts the upper terminal block 2, and the second contact contacts the lower terminal block 3;

[0040] The communicating pipe 9 is arranged on one side of the porcelain bushing 1 and communicates with both ends of the cavity respectively. A closing assembly is provided at one end of the pipe body 6. When the fuse wire 11 melts, the closing assembly opens the pipe body 6 to enable the pipe body 6 to communicate with one end of the adjacent communicating pipe 9.

[0041] In the present invention, the upper terminal block 2 and the lower terminal block 3 are respectively fixed to the top end and the bottom end of the cavity, and are correspondingly energized through the first external wire 4 to the upper terminal block 2 and the second external wire 5 to the lower terminal block 3. After the pipe body 6 is placed in the cavity, only by contacting the first contact 7 with the upper terminal block 2 and the second contact with the lower terminal block 3, the connection between the enclosed jet fuse and the power grid line can be realized.

[0042] By clamping the pipe body 6 with the connecting seat 8 arranged in the cavity, compared with the traditional method, the situation that the pipe body 6 cannot be effectively connected when the thread connection slips after a long time is avoided. On the basis of the above-mentioned clamping of the connecting seat 8 and the pipe body 6, the pipe body 6 also abuts against the inner wall of the cavity through the connecting seat 8, thereby ensuring the connection stability between the pipe body 6 and the porcelain bushing 1.

[0043] By using the communicating pipe 9 arranged on one side of the porcelain bushing 1, both ends of the communicating pipe 9 are respectively communicated with both sides of the porcelain bushing 1. At the same time, a closing assembly is provided at one end of the pipe body 6, and the closing assembly can open one end of the pipe body 6 when the fuse wire 11 melts, so that a large amount of gas generated in the pipe body 6 due to the melting of the fuse wire 11 can be vented out through the opening end of the pipe body 6. During the gas flow, the arc can be blown out, and the gas can flow along one end of the adjacent communicating pipe 9, avoiding the structural damage caused by the sudden formation of high-intensity air pressure in the porcelain bushing 1 and effectively prolonging the service life of the porcelain bushing 1.

[0044] Further, the closing assembly includes:

[0045] A baffle 10 is movably fitted at the bottom end of the pipe body 6. An elastic member is arranged in the pipe body 6. The baffle 10 is connected to the fuse wire 11 through the elastic member, and the baffle 10 has an elastic tendency away from the pipe body 6. The baffle 10 is used to block the opening at the bottom end of the pipe body 6.

[0046] The fuse wire 11 is connected to the baffle 10 through the elastic member, so that the baffle 10 has an elastic tendency away from the pipe body 6. Thus, when the fuse wire 11 melts, the baffle 10 can pop out of the pipe body 6 to connect the pipe body 6 with one end of the communicating pipe 9, and when the fuse wire 11 remains energized, the baffle 10 blocks the inside of the pipe body 6 under the traction of the fuse wire 11.

[0047] Further, the elastic member includes:

[0048] The connecting column 12 is slidably connected to the bottom end of the pipe body 6. Both ends of the fuse wire 11 are fixedly connected to the first contact 7 and the connecting column 12 respectively. A baffle 10 is fixedly connected to the bottom end of the connecting column 12. A first spring 13 is sleeved on the connecting column 12, and both ends of the first spring 13 abut against the bottom surface of the pipe body 6 and the baffle 10 respectively.

[0049] By threading the fuse wire 11 through the pipe body 6, and the bottom end of the fuse wire 11 extends out of the pipe body 6 and is fixedly connected to the baffle 10. Under the traction of the fuse wire 11, the baffle 10 seals the bottom end of the pipe body 6. At the same time, a first spring 13 and a connecting column 12 are arranged between the baffle 10 and the pipe body 6. After the fuse wire 11 is melted, the baffle 10 moves in a direction away from the pipe body 6 under the action of the first spring 13.

[0050] In this technical solution, the connecting column 12 is made of a wire material as the second contact, and is of a cylindrical structure so that the first spring 13 can be sleeved on the connecting column 12. The material of the first contact 7 is the same as that of the connecting column 12, which will not be elaborated here.

[0051] Further, a conductive seat 14 is fixedly connected to the bottom side wall of the pipe body 6. The baffle 10 abuts against the conductive seat 14 through the fuse wire 11, and the outer side wall of the conductive seat 14 is used to contact the lower terminal block 3.

[0052] The conductive seat 14 fixedly connected to the bottom of the pipe body 6 is used to electrically connect the baffle 10 and the lower terminal block 3 respectively, so as to ensure that the upper terminal block 2 is electrically connected along the direction of the first contact 7, the fuse wire 11, the connecting column 12, the baffle 10 and the conductive seat 14. When the baffle 10 seals the pipe body 6, the overall fuse forms a circuit with the power grid line. When the baffle 10 pops out of the pipe body 6, it can not only release the gas generated when the fuse wire 11 is melted, but also disconnect the electrical connection between the conductive seat 14 and the connecting column 12.

[0053] Further, it further includes:

[0054] An alarm 15, fixedly connected to the porcelain bushing 1. The bottom end of the porcelain bushing 1 is detachably connected with an end cover 16. A trigger 17 is arranged inside the end cover 16. The trigger end of the trigger 17 is fixedly connected to the bottom surface of the baffle 10, and the trigger 17 is communicatively connected to the alarm 15.

[0055] By using the trigger 17 arranged on the end cover 16 and cooperating with the alarm 15, and the trigger end is driven and controlled by the baffle 10. After the fuse wire 11 is melted, the baffle 10 pops out under the action of the first spring 13, so that the trigger end of the trigger 17 contacts the trigger 17. By using the communicative connection between the alarm 15 and the trigger 17, an alarm is given outside the porcelain bushing 1 to prompt the personnel that the fuse has melted.

[0056] In this technical solution, the trigger 17 is a pressure sensor, and the alarm 15 is an acoustic-optic alarm 15. It is communicatively connected through the pressure sensor. After the baffle 10 pops out and the pressure acts on the pressure sensor, an electrical signal to activate the acoustic-optic alarm 15 is formed to control the alarm 15 to give an alarm.

[0057] Furthermore, it further includes:

[0058] A support seat 18 is fixedly connected to one side of the porcelain bushing 1. A limiting groove is provided inside the support seat 18. One end of the connecting seat 8 penetrates through the support seat 18 and is fixedly connected with a pull ring 19. And two limiting posts 20 are respectively fixedly connected to both sides of the connecting seat 8. The limiting posts 20 are slidably connected with the limiting groove. A second spring 21 is fixedly connected to the bottom end of the limiting post 20. The end of the second spring 21 away from the limiting post 20 is fixedly connected with the support seat 18. The connecting seat 8 has an elastic tendency in the vertical upward direction.

[0059] By pulling the pull ring 19 to move the connecting seat 8, and the connecting seat 8 maintains stable vertical sliding under the combined action of the limiting post 20 and the support seat 18. By arranging the second spring 21 between the limiting post 20 and the support seat 18, the connecting seat 8 has an elastic tendency in the vertical upward direction. On the basis of the connection between the connecting seat 8 and the pipe body 6, the pipe body 6 can be abutted against the inner wall of the cavity, ensuring the fixing stability of the pipe body 6. And when the pipe body 6 needs to be replaced, only need to pull the pull ring 19 to move the connecting seat 8 along the direction of squeezing the second spring 21. The pipe body 6 loses the abutting effect of the connecting seat 8 and can be taken out of the cavity movably.

[0060] Furthermore, the connecting seat 8 is of an annular structure. A chute is provided on the inner side wall of the top of the cavity. The connecting seat 8 is slidably connected in the chute. A clamping groove is provided on the inner side wall surface of the inner ring of the connecting seat 8. A clamping block 22 is fixedly connected to the outer wall surface of the pipe body 6. The clamping block 22 is slidably matched with the clamping groove and is distributed in a vertical dislocation manner.

[0061] Specifically, an empty groove is provided in the supporting block 23 fixedly connected inside the connecting seat 8, so that the pipe body 6 is slidably matched with the empty groove. At the same time, a clamping groove is provided on the inner side wall of the empty groove. A clamping block 22 is fixedly connected to the outer side wall of the top of the pipe body 6. The clamping block 22 and the clamping groove are distributed in a vertical dislocation manner. Thus, by rotating the pipe body 6, the state of being clamped or slidably connected with the connecting seat 8 can be switched, realizing the detachable connection between the pipe body 6 and the porcelain bushing 1.

[0062] Furthermore, a supporting block 23 is fixedly connected to the inner ring side of the connecting seat 8. An empty groove slidably matched with the pipe body 6 is provided at the center of the supporting block 23. Two clamping grooves are oppositely arranged along the inner wall surface of the empty groove. The supporting block 23 is clamped with the clamping block 22.

[0063] By using the supporting block 23 to abut against the clamping block 22, the fixing stability of the pipe body 6 is enhanced. At the same time, by adjusting the setting height of the supporting block 23, the pipe body 6 can be abutted against the inner wall of the cavity, improving the adaptability and matching degree of the fixing of the pipe body 6 with the cavity.

[0064] Further, it further includes:

[0065] At least one buffer valve 24, which is arranged in the connecting pipe 9.

[0066] By arranging the buffer valve 24 in the connecting pipe 9, after the baffle 10 is opened, the gas released by the melting of the fuse wire 11 can enter the top of the cavity along the direction of the connecting pipe 9. Since the connecting seat 8 penetrates the cavity and the support seat 18, a gas guiding path is formed, which can not only effectively release the gas, but also further reduce the situation of the porcelain bushing 1 being damaged due to air pressure in combination with the buffer valve 24.

[0067] Further, a groove is opened on the inner wall of the top end of the cavity. The inner wall of the top end of the groove is fixedly connected with an upper terminal block 2, and the inner side wall of the groove is fixedly connected with a fixing seat 25. A positioning groove is opened at the center of the fixing seat 25, and the first contact 7 extends into the positioning groove to contact the upper terminal block 2.

[0068] The wiring seat is fixed through the fixing seat 25 outside the groove, which improves the connection stability between the upper terminal block 2 and the porcelain bushing 1. The lower terminal block 3 is arranged at the bottom end of the porcelain bushing 1, and the bottom end of the porcelain bushing 1 is threadedly connected with an end cover 16, which is convenient for adjusting and fixing the lower terminal block 3 and ensuring the contact effect between the second external wiring 5 and the conductive seat 14.

[0069] The working principle of the enclosed jet fuse of the present invention is as follows:

[0070] When a fuse break occurs, the fuse wire 11 melts and releases gas from the tube body 6 to extinguish the arc. After the connecting column 12 loses the traction of the fuse wire 11, the first spring 13 drives the baffle 10 to pop out of the tube body 6, opening the bottom end of the tube body 6. At the same time, the baffle 10 contacts the trigger 17 to start the alarm 15. The opening of the bottom end of the tube body 6 can conduct the gas out. The discharged gas enters the chute along the connecting pipe and passes out of the porcelain bushing 1 through the gap between the connecting seat 8 and the porcelain bushing 1, ensuring effective arc extinguishing and extending the service life of the porcelain bushing 1.

[0071] When the tube body 6 needs to be replaced, only need to pull the pull ring 19 to leave a space between the connecting seat 8 and the inner wall of the top end of the cavity, so that the clamping block 22 can rotate in the space. When the clamping block 22 corresponds to and matches the clamping groove, the tube body 6 can be taken out of the porcelain bushing 1. Similarly, when installing the tube body 6, the clamping block 22 penetrates the supporting block 23 corresponding to the clamping groove, and then the tube body 6 is rotated to make the clamping block 22 misaligned with the clamping groove. Release the pull ring 19, and under the action of the second spring 21, the clamping block 22 abuts against the inner wall of the cavity to complete the fixing of the tube body 6.

[0072] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A closed ejection fuse, characterized in that: include: A porcelain sleeve (1) defines a cavity therein, wherein an upper wiring seat (2) and a lower wiring seat (3) are fixedly connected to the cavity, respectively, wherein the upper wiring seat (2) is used to be electrically connected to a first external wiring seat (4), and the lower wiring seat (3) is used to be electrically connected to a second external wiring seat (5); The tube body (6) has a first contact (7) and a second contact fixedly connected at both ends, respectively, and the first contact (7) and the second contact are electrically connected via a fuse (11); A connecting seat (8) is arranged in the cavity, one end of the tube body (6) passes through the connecting seat (8) and is clamped with the connecting seat (8), the tube body (6) abuts against the inner wall of the cavity through the connecting seat (8), and the first contact (7) contacts the upper wiring seat (2), and the second contact contacts the lower wiring seat (3); a connecting pipe (9) arranged on one side of the porcelain sleeve (1) and respectively connected to both ends of the cavity; a sealing component is provided at one end of the tube body (6); when the fuse (11) is blown, the sealing component opens the tube body (6) so that the tube body (6) is connected to one end of the adjacent connecting pipe (9); A support seat (18) is fixedly connected to one side of the porcelain sleeve (1), a limiting groove is provided in the support seat (18), one end of the connecting seat (8) passes through the support seat (18) and is fixedly connected with a pull ring (19), and both sides of the connecting seat (8) are respectively fixedly connected with limiting columns (20), the limiting columns (20) are slidably connected with the limiting groove, the bottom end of the limiting column (20) is fixedly connected with a second spring (21), and one end of the second spring (21) away from the limiting column (20) is fixedly connected to the support seat (18), and the connecting seat (8) has an elastic tendency in a vertically upward direction.

2. The enclosed ejection fuse according to claim 1, characterized in that: The closure assembly comprises: A baffle (10) is movably fitted at the bottom end of the tube body (6); an elastic member is provided in the tube body (6); the baffle (10) is connected to the fusible link (11) via the elastic member; and the baffle (10) has an elastic tendency to move away from the tube body (6); the baffle (10) is used to seal the bottom end opening of the tube body (6).

3. The enclosed ejection fuse according to claim 2, characterized in that: The elastic member comprises: A connecting column (12) is slidably connected to the bottom end of the tube body (6); two ends of the fuse (11) are respectively fixedly connected to the first contact (7) and the connecting column (12); the baffle (10) is fixedly connected to the bottom end of the connecting column (12); a first spring (13) is sleeved on the connecting column (12); two ends of the first spring (13) are respectively abutted against the bottom surface of the tube body (6) and the baffle (10).

4. The enclosed ejection fuse according to claim 3, characterized in that: A conductive seat (14) is fixedly connected to the bottom side wall of the tube body (6); the baffle (10) abuts against the conductive seat (14) via the fuse (11); and the outer side wall of the conductive seat (14) is used to contact the lower terminal seat (3).

5. The enclosed ejection fuse according to claim 2, characterized in that: Also includes: An alarm (15) is fixedly connected to the porcelain sleeve (1); the bottom end of the porcelain sleeve (1) is detachably connected to an end cover (16); a trigger (17) is arranged inside the end cover (16); a trigger end of the trigger (17) is fixedly connected to the bottom surface of the baffle (10); and the trigger (17) is communicatively connected to the alarm (15).

6. The enclosed ejection fuse according to claim 1, characterized in that: The connecting seat (8) is an annular structure, the top inner side wall of the cavity is provided with a slide groove, the connecting seat (8) is slidably connected in the slide groove, the inner ring side wall surface of the connecting seat (8) is provided with a clamping groove, the outer wall surface of the tube body (6) is fixedly connected with a clamping block (22), the clamping block (22) is slidably matched with the clamping groove, and is staggered in the vertical direction.

7. The enclosed ejection fuse according to claim 6, characterized in that: A support block (23) is fixedly connected to the inner ring side of the connecting seat (8), a hollow groove for slidingly cooperating with the tube body (6) is provided at the center of the support block (23), two clamping grooves are arranged opposite to each other along the inner wall surface of the hollow groove, and the support block (23) is clamped with the clamping block (22).

8. The enclosed ejection fuse according to claim 1, characterized in that: Also includes: At least one buffer valve (24) is arranged in the connecting pipe (9).

9. The enclosed ejection fuse according to claim 1, characterized in that: A groove is formed on the inner wall at the top of the cavity, the upper wiring seat (2) is fixedly connected to the inner wall at the top of the groove, a fixing seat (25) is fixedly connected to the inner wall of the groove, a positioning groove is formed at the center of the fixing seat (25), and the first contact (7) extends into the positioning groove to contact the upper wiring seat (2).

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