Enclosed jet fuse

Abstract

The invention relates to the technical field of fuses, and provides a closed jet fuse, which comprises a porcelain bushing, an upper wire holder and a lower wire holder which are respectively and fixedly connected in a cavity defined in the porcelain bushing, the upper wire holder is used for being electrically connected with a first external wire, and the lower wire holder is used for being electrically connected with a second external wire; the two ends of the pipe body are fixedly connected with a first contact and a second contact respectively, the connecting base is arranged in the cavity, one end of the pipe body penetrates through the connecting base and is clamped with the connecting base, the pipe body abuts against the inner wall of the cavity through the connecting base, the first contact is in contact with the upper wire holder, and the second contact is in contact with the lower wire holder; the communicating pipes are arranged on one side of the porcelain bushing and communicated with the two ends of the cavity respectively, a sealing assembly is arranged at one end of the pipe body, and when the fuse wire is fused, the sealing assembly opens the pipe body so that the pipe body can be communicated with one end of the adjacent communicating pipe. The pipe body can be conveniently installed, the contact effect of the contact and the wire holder is guaranteed, the porcelain bushing structure is protected, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of fuses, in particular to a closed ejection type fuse. Background Art

[0002] With the continuous advancement of high-voltage products, the requirements for power grid distribution line products are gradually increasing. Conventional drop-out fuses cannot meet conventional needs, have a high failure rate, and have great safety hazards. Ejector fuses can use their own melt to form an arc, and generate a large amount of gas through special materials in the tube to blow out the arc, forming an electrical break to disconnect the circuit, effectively improving the safety of use and circuit-breaking effect, and are widely used.

[0003] However, the traditional enclosed ejection fuse needs to twist the tube body, which is connected by screw head and porcelain sleeve thread. After long-term replacement and use, the screw head and porcelain sleeve are prone to slipping, resulting in the tube body cannot be effectively installed, the contact and the terminal block cannot contact to form a path, and the overall fuse cannot be used;

[0004] In addition, when a large amount of gas is generated in the tube body to blow out the arc, the porcelain sleeve structure is also prone to structural explosion and damage under the influence of gas pressure, and its service life is relatively low. Therefore, a closed ejection fuse is urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a closed ejection type fuse to solve the problems existing in the above-mentioned prior art, to facilitate the installation of the tube body, to ensure the contact effect between the contact and the terminal block, and to protect the porcelain sleeve structure to extend the service life.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a closed ejection fuse, comprising:

[0007] The porcelain sleeve defines a cavity inside, wherein an upper wiring seat and a lower wiring seat are respectively fixed in the cavity, wherein the upper wiring seat is used to be electrically connected to a first external wiring, and the lower wiring seat is used to be electrically connected to a second external wiring;

[0008] The tube body has a first contact and a second contact fixedly connected at both ends, respectively, and the first contact and the second contact are electrically connected via a fusible wire;

[0009] A connection seat is arranged in the cavity, one end of the tube body passes through the connection seat and is engaged with the connection seat, the tube body abuts against the inner wall of the cavity through the connection seat, the first contact contacts the upper connection seat, and the second contact contacts the lower connection seat;

[0010] A connecting pipe is arranged on one side of the porcelain sleeve and is connected to both ends of the cavity respectively. A closing component is provided at one end of the tube body. When the fuse is blown, the closing component opens the tube body to connect the tube body with one end of the adjacent connecting pipe.

[0011] Preferably, the closure assembly comprises:

[0012] A baffle is movably fitted in the bottom end of the tube body, an elastic member is arranged in the tube body, the baffle is connected to the fusible line through the elastic member, and the baffle has an elastic tendency to move away from the tube body, and the baffle is used to block the bottom end opening of the tube body.

[0013] Preferably, the elastic member comprises:

[0014] A connecting column is slidably connected to the bottom end of the tube body, two ends of the fusible line are respectively fixedly connected to the first contact and the connecting column, the bottom end of the connecting column is fixedly connected to the baffle, a first spring is sleeved on the connecting column, and two ends of the first spring are respectively against the bottom surface of the tube body and the baffle.

[0015] Preferably, a conductive seat is fixedly connected to the bottom side wall of the tube body, the baffle is abutted against the conductive seat through the fusible link, and the outer side wall of the conductive seat is used to contact the lower terminal seat.

[0016] Preferably, it also includes:

[0017] The alarm is fixedly connected to the porcelain sleeve, the bottom end of the porcelain sleeve 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, and the trigger is communicatively connected with the alarm.

[0018] Preferably, it also includes:

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

[0020] Preferably, the connecting seat is an annular structure, the top inner wall of the cavity is provided with a slide groove, the connecting seat is slidably connected in the slide groove, the inner ring side wall of the connecting seat is provided with a clamping groove, the outer wall of the tube body is fixed with a clamping block, the clamping block slides with the clamping groove and is staggered in the vertical direction.

[0021] Preferably, a support block is fixedly connected to the inner ring side of the connecting seat, a hollow groove for slidingly cooperating with the tube body is opened in the center of the support block, two clamping grooves are arranged opposite to each other along the inner wall surface of the hollow groove, and the support block is clamped with the clamping block.

[0022] Preferably, it also includes:

[0023] At least one buffer valve is arranged in the connecting pipe.

[0024] Preferably, a groove is formed on the inner wall at the top of the cavity, the upper terminal block is fixedly connected to the inner wall at the top of the groove, a fixing seat is fixedly connected to the inner side wall of the groove, a positioning groove is formed at the center of the fixing seat, and the first contact extends into the positioning groove to contact the upper terminal block.

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

[0026] 1. The present invention fixes an upper wiring seat and a lower wiring seat at the top and bottom of the cavity respectively, and energizes the upper wiring seat through a first external wire and energizes the lower wiring seat through a second external wire. After the tube body is placed in the cavity, it is only necessary to contact the first contact with the upper wiring seat and the second contact with the lower wiring seat to achieve the connection between the enclosed ejection fuse and the power grid line.

[0027] 2. By clamping the connecting seat set in the cavity with the tube body, compared with the traditional method, it is avoided that the tube body cannot be effectively connected when the thread slips during a long period of threaded connection. On the basis of the clamping of the connecting seat and the tube body, the tube body is also abutted against the inner wall of the cavity through the connecting seat, thereby ensuring the connection stability between the tube body and the porcelain sleeve.

[0028] 3. Use a connecting pipe arranged on one side of the porcelain sleeve, connect the two ends of the connecting pipe with the two sides of the porcelain sleeve respectively, and arrange a closing component at one end of the tube body, and the closing component can open one end of the tube body when the fuse melts, so that a large amount of gas generated in the tube body due to the melting of the fuse can flow out along the open end of the tube body, and the arc can be blown out during the gas flow, and the gas can flow along one end of the adjacent connecting pipe, avoiding structural damage caused by the sudden formation of high-intensity gas pressure in the porcelain sleeve, and effectively extending the service life of the porcelain sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1It is a structural cross-sectional view of the enclosed ejection type fuse of the present invention;

[0031] Figure 2 A diagram showing the positional relationship between the connecting seat and the pull ring in the present invention;

[0032] Figure 3 This is a structural front 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 terminal; 5. second external terminal; 6. tube body; 7. first contact; 8. connecting seat; 9. connecting pipe; 10. baffle; 11. fuse; 12. connecting column; 13. first spring; 14. conductive seat; 15. alarm; 16. end cover; 17. trigger; 18. support seat; 19. pull ring; 20. limit column; 21. second spring; 22. block; 23. support block; 24. buffer valve; 25. fixed seat. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figure 1-Figure 3 The present invention provides a closed ejection type fuse, comprising:

[0037] The porcelain sleeve 1 defines a cavity inside, and an upper terminal block 2 and a lower terminal block 3 are fixedly connected in the cavity, the upper terminal block 2 is used to be electrically connected to a first external terminal 4, and the lower terminal block 3 is used to be electrically connected to a second external terminal 5;

[0038] The tube body 6 has a first contact 7 and a second contact fixedly connected at both ends, and the first contact 7 and the second contact are electrically connected via a fuse 11;

[0039] The 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;

[0040] The connecting pipe 9 is arranged on one side of the porcelain sleeve 1 and is connected to both ends of the cavity respectively. A closing component is provided at one end of the tube body 6. When the fuse 11 is blown, the closing component opens the tube body 6 to connect the tube body 6 with one end of the adjacent connecting pipe 9.

[0041] The present invention fixes an upper terminal block 2 and a lower terminal block 3 at the top and bottom ends of the cavity respectively, and energizes the upper terminal block 2 and the second external terminal block 5 with the lower terminal block 3 respectively, and after the tube body 6 is placed in the cavity, it is only necessary to contact the first contact 7 with the upper terminal block 2 and the second contact with the lower terminal block 3 to realize the connection between the enclosed ejection fuse and the power grid line.

[0042] By clamping the connecting seat 8 set in the cavity with the tube body 6, compared with the traditional method, the situation where the tube body 6 cannot be effectively connected when the thread slips during a long period of threaded connection is avoided. On the basis of the clamping of the connecting seat 8 and the tube body 6, the tube body 6 is also abutted against the inner wall of the cavity through the connecting seat 8, thereby ensuring the connection stability between the tube body 6 and the porcelain sleeve 1.

[0043] By using the connecting tube 9 arranged on one side of the porcelain sleeve 1, the two ends of the connecting tube 9 are respectively connected with the two sides of the porcelain sleeve 1, and a closing component is arranged at one end of the tube body 6, and the closing component can open one end of the tube body 6 when the fuse 11 is blown, so that a large amount of gas generated in the tube body 6 due to the melting of the fuse 11 can flow out along the open end of the tube body 6, and the arc can be blown out during the gas flow process, and the gas can flow along one end of the adjacent connecting tube 9, thereby avoiding structural damage caused by the sudden formation of high-intensity gas pressure in the porcelain sleeve 1, and effectively extending the service life of the porcelain sleeve 1.

[0044] Further, the closure assembly comprises:

[0045] The baffle 10 is movably fitted at the bottom end of the tube body 6. An elastic member is provided inside the tube body 6. The baffle 10 is connected to the fuse 11 through 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.

[0046] The fusible link 11 is connected to the baffle 10 through an elastic member, so that the baffle 10 has an elastic tendency in a direction away from the tube body 6, so that when the fusible link 11 is blown, the baffle 10 can pop out of the tube body 6 to connect one end of the tube body 6 to the tube 9, and when the fusible link 11 remains energized, the baffle 10 seals the inside of the tube body 6 under the traction of the fusible link 11.

[0047] Furthermore, the elastic member comprises:

[0048] The connecting column 12 is slidably connected to the bottom end of the tube body 6. The two ends of the fuse 11 are fixedly connected to the first contact 7 and the connecting column 12 respectively. The bottom end of the connecting column 12 is fixedly connected with a baffle 10. The connecting column 12 is sleeved with a first spring 13. The two ends of the first spring 13 are respectively against the bottom surface of the tube body 6 and the baffle 10.

[0049] The fusible link 11 is passed through the tube body 6, and the bottom end of the fusible link 11 extends out of the tube body 6 and is fixedly connected to the baffle 10. Under the traction of the fusible link 11, the baffle 10 blocks the bottom end of the tube body 6. At the same time, a first spring 13 and a connecting column 12 are arranged between the baffle 10 and the tube body 6. After the fusible link 11 is blown, the baffle 10 moves in a direction away from the tube body 6 under the action of the first spring 13.

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

[0051] Furthermore, 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 fusible wire 11 , and the outer side wall of the conductive seat 14 is used to contact the lower terminal seat 3 .

[0052] The baffle 10 and the lower terminal block 3 are electrically connected respectively by using the conductive seat 14 fixed to the bottom of the tube body 6, so as to ensure that the fusible link 11 electrically connects the upper terminal block 2 along the direction of the first contact 7, the fusible link 11, the connecting column 12, the baffle 10 and the conductive seat 14. When the baffle 10 blocks the tube body 6, the integral fuse forms a passage with the power grid line. When the baffle 10 pops out of the tube body 6, it can not only release the gas generated when the fusible link 11 is melted, but also disconnect the electrical connection between the conductive seat 14 and the connecting column 12.

[0053] Furthermore, it also includes:

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

[0055] A trigger 17 cooperating with the alarm 15 is provided on the end cover 16, and the trigger end is driven and controlled by the baffle 10. After the fusible link 11 is blown, the baffle 10 pops up under the action of the first spring 13, so that the trigger end of the trigger 17 contacts with the trigger 17, and the alarm 15 is connected to the trigger 17 by communication, so that an alarm is sounded outside the porcelain sleeve 1 to remind personnel that the fuse is blown.

[0056] In this technical solution, the trigger 17 is a pressure sensor, and the alarm 15 is an audible and visual alarm 15. The pressure sensor is connected to the audible and visual alarm 15 through communication. After the baffle 10 pops out and the pressure acts on the pressure sensor, an electrical signal is generated to start the audible and visual alarm 15, thereby controlling the alarm 15 to sound an alarm.

[0057] Furthermore, it also includes:

[0058] The support seat 18 is fixedly connected to one side of the porcelain sleeve 1, and 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 the two sides of the connecting seat 8 are respectively fixedly connected with limiting columns 20, and 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 the 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 the vertical upward direction.

[0059] The connecting seat 8 is moved by pulling the pull ring 19, and the connecting seat 8 maintains vertical stable sliding under the cooperation of the limit column 20 and the support seat 18. By setting a second spring 21 between the limit column 20 and the support seat 18, the connecting seat 8 has an elastic tendency in the vertical upward direction. On the basis of the clamping connection between the connecting seat 8 and the tube body 6, the tube body 6 can be abutted against the inner wall of the cavity to ensure the fixed stability of the tube body 6. When the tube body 6 needs to be replaced, it is only necessary to pull the pull ring 19 to move the connecting seat 8 in the direction of squeezing the second spring 21. The tube body 6 loses the abutment of the connecting seat 8 and can be moved out of the cavity.

[0060] Furthermore, the connecting seat 8 is an annular structure, and a sliding groove is provided on the inner wall of the top of the cavity. The connecting seat 8 is slidably connected in the sliding groove. A clamping groove is provided on the inner ring side wall of the connecting seat 8. A clamping block 22 is fixedly connected to the outer wall of the tube body 6. The clamping block 22 slides with the clamping groove and is staggered in the vertical direction.

[0061] Specifically, an empty groove is opened by using the supporting block 23 fixed in the connecting seat 8, so that the tube body 6 can be slidably matched with the empty groove. At the same time, a clamping groove is opened on the inner side wall of the empty groove, and a clamping block 22 is fixed on the top outer side wall of the tube body 6. The clamping block 22 and the clamping groove are staggered in the vertical direction, so that the state of clamping or sliding connection with the connecting seat 8 can be switched by rotating the tube body 6, thereby realizing a detachable connection between the tube body 6 and the porcelain sleeve 1.

[0062] Furthermore, a support block 23 is fixedly connected to the inner ring side of the connecting seat 8 , and a hollow groove for slidingly cooperating with the tube body 6 is opened in the center of the support block 23 . Two clamping grooves are arranged opposite to each other along the inner wall of the hollow groove, and the support block 23 is clamped with the clamping block 22 .

[0063] The supporting block 23 is used to abut against the clamping block 22 to enhance the fixing stability of the tube body 6. Meanwhile, the setting height of the supporting block 23 can be adjusted so that the tube body 6 abuts against the inner wall of the cavity, thereby improving the adaptability and matching degree between the tube body 6 and the cavity.

[0064] Furthermore, it also includes:

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

[0066] By arranging a buffer valve 24 in the connecting pipe 9, when the baffle 10 is opened, the gas released by the melting of the fusible link 11 can flow into the top of the cavity along the direction of the connecting pipe 9. Since the connecting seat 8 passes through the cavity and the supporting seat 18, a gas guiding outlet is formed, which not only effectively releases the gas, but also can further reduce the gas pressure in combination with the buffer valve 24, which may cause damage to the structure of the porcelain sleeve 1.

[0067] Furthermore, a groove is formed on the inner wall at the top of the cavity, an upper terminal block 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 terminal block 2.

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

[0069] The working principle of the enclosed ejection fuse of the present invention is:

[0070] When melting occurs, the fusible link 11 melts and releases gas from the tube body 6 to extinguish the arc. After the connecting column 12 loses the traction effect of the fusible link 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 activate the alarm 15. The bottom end of the tube body 6 is opened to discharge the gas. The discharged gas enters the slide groove along the connecting pipe and passes through the gap between the connecting seat 8 and the porcelain sleeve 1 to pass through the porcelain sleeve 1, thereby ensuring effective arc extinguishing and extending the service life of the porcelain sleeve 1.

[0071] When the tube body 6 needs to be replaced, it is only necessary to pull the pull ring 19 to reserve space between the connecting seat 8 and the inner wall of the top of the cavity so that the block 22 can rotate in the space. When the block 22 corresponds to the slot, the tube body 6 can be taken out of the porcelain sleeve 1. Similarly, when the tube body 6 is in place, the block 22 is passed through the supporting block 23 in the corresponding slot, and then the tube body 6 is rotated to dislocate the block 22 from the slot. The pull ring 19 is released and the block 22 is abutted against the inner wall of the cavity under the action of the second spring 21, thereby completing the fixation of the tube body 6.

[0072] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as limiting the present invention. The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solution of the present invention by ordinary technicians in this field should all fall within the scope of protection 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 in 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) is arranged on one side of the porcelain sleeve (1) and is 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).

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 arranged inside 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), the 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), and the two ends of the first spring (13) are respectively 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 wiring 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: Also includes: A support seat (18) is fixedly connected to one side of the porcelain sleeve (1), and 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), and 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.

7. The enclosed ejection fuse according to claim 1, characterized in that: The connecting seat (8) is an annular structure, the top inner 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 of the connecting seat (8) is provided with a clamping groove, the outer wall 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.

8. The enclosed ejection fuse according to claim 7, characterized in that: A support block (23) is fixedly connected to the inner ring side of the connecting seat (8), and a hollow groove for slidingly matching 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).

9. 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).

10. 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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