Base-modularized enclosed fuse with sensing contact and manufacturing method thereof

Abstract

The invention relates to a base-modularized closed fuse with a sensing contact and a manufacturing method thereof. The fuse comprises an upper wiring end, an upper contact group, an arc extinction tube, an arc extinction rod, a lower contact group, a base group, a lower wiring end, a connecting piece, an insulating jacket, an insulating cylinder, a base group body, a base group lower wiring seat and a fuse carrier group, the upper contact group comprises an upper contact group electrode, a conductor, a spring, a temperature sensor and a contact seat, the lower contact group comprises a rivet, a fixed plate, an elastic contact piece and a hoop spring, the base group comprises a base group body and a lower wire holder, and the fuse carrier group comprises a fuse carrier group upper contact, a fuse tube, a lower contact and a fuse link. According to the invention, the problems of difficult fuse operation state monitoring, difficult fault point positioning and the like are solved. According to the invention, the assembly process of the fuse base is simplified to the greatest extent, so that the qualification rate and quality of the fuse base are greatly improved. According to the invention, the problem of inaccurate measurement result caused by indirect temperature measurement of the product contact is solved.

Description

Technical Field

[0001] The invention relates to the technical field of power accessories, and specifically discloses a base modular enclosed fuse with a sensing contact and a manufacturing method thereof. Background Art

[0002] With the continuous development and improvement of my country's industrial economy, the State Grid has increased investment in the construction of overhead distribution lines, and the lightning protection technology of overhead distribution lines has developed rapidly. Fuses are installed on the incoming side of the line tower transformer. The fuses have the characteristics of low cost, large breaking capacity and fast fault current removal. The transformer is protected from overload and fault current. It can also be used to protect the branch lines of the distribution network.

[0003] Compared with drop-out fuses, enclosed fuses have all live parts placed inside the insulating jacket, i.e., a built-in contact structure. This significantly improves their anti-fouling performance and effectively prevents the influence of foreign matter (domestic garbage, birds, branches, etc.). The conductive parts are not exposed to the natural environment, thus overcoming the influence of rain and snow, improving the anti-oxidation ability of the contacts, and extending the service life of the equipment. However, it is precisely because of this built-in contact structure that the manufacturing process is complicated and cumbersome, which affects the product qualification rate and causes unstable product quality.

[0004] It is not uncommon for fuses to have quality problems or be affected by the environment during use, which may affect the normal operation of the power grid. Most of the problems are caused by poor contact, which leads to heating and eventually burns the contacts. There are many fuse products with temperature sensors on the market, but the temperature sensors of these products are all set near the contacts due to the structural problems of the products themselves. This makes it difficult to measure the contact temperature directly and accurately. Summary of the invention

[0005] The object of the present invention is to overcome the deficiencies in the prior art and to provide a base modular enclosed fuse with a sensing contact and a manufacturing method thereof.

[0006] According to the technical solution provided by the present invention, the base modular enclosed fuse with a sensing contact comprises an upper terminal, an upper contact group, an arc extinguishing tube, an arc extinguishing rod, a lower contact group, a base group, a lower terminal, a connector, an insulating jacket, an insulating tube, a base group body, a base group lower terminal seat and a fuse carrier group; The outer circle of the lower end of the upper terminal is provided with an upper contact group electrode connecting external thread; The upper contact group includes an upper contact group electrode, an upper contact group conductor, an upper contact group spring, an upper contact group temperature sensor and an upper contact group contact seat; an upper terminal connection internal thread is provided on the upper contact group electrode, an insulating tube connection external thread is provided on the outer circle of the upper contact group electrode, an upper contact group contact seat is provided below the upper contact group electrode, an arc extinguishing rod connection external thread is provided on the outer circle of the upper contact group contact seat, an upper contact group temperature sensor is installed in the upper contact group contact seat, the upper contact group electrode and the upper contact group contact seat are connected through the upper contact group conductor, the upper end of the upper contact group conductor is installed in the upper contact group electrode, the lower end of the upper contact group conductor passes through the upper contact group temperature sensor and is installed in the upper contact group contact seat, and an upper contact group spring is installed between the upper contact group electrode and the upper contact group contact seat; The upper end of the arc extinguishing rod is provided with an internal thread for connecting the upper contact group contact seat; The lower contact group comprises a lower contact group rivet, a lower contact group fixing plate, a lower contact group elastic contact piece and a lower contact group hoop spring; a fuse-carrying member through hole is provided on the lower contact group fixing plate, a plurality of lower contact group elastic contact pieces evenly distributed around the fuse-carrying member through hole are fixed on the lower surface of the lower contact group fixing plate through the lower contact group rivet, and a lower contact group hoop spring is sleeved on the outer side of the lower contact group elastic contact piece; The base assembly comprises a base assembly body and a base assembly lower wiring seat fixed together; the base assembly lower wiring seat is fixed in the base assembly body, an internal thread hole for installing a lower wiring terminal is provided on the base assembly lower wiring seat, and an insulating tube is provided on the inner circle of the base assembly lower wiring seat to connect the internal thread; The inner end outer circle of the lower terminal is provided with a base assembly lower terminal seat connecting external thread; The fuse carrier group comprises an upper contact of the fuse carrier group, a fuse tube of the fuse carrier group, a lower contact of the fuse carrier group and a fuse of the fuse carrier group; an outer thread of the upper contact of the fuse carrier group is provided at the lower end of the upper contact of the fuse carrier group, an inner thread of the fuse tube of the fuse carrier group is provided at the upper end of the fuse tube of the fuse carrier group, the outer thread of the upper contact of the fuse carrier group is engaged with the inner thread of the fuse tube of the fuse carrier group so that the upper contact of the fuse carrier group is installed on the upper end of the fuse tube of the fuse carrier group, a lower contact of the fuse carrier group is installed on the outer side of the lower end of the fuse tube of the fuse carrier group, a fuse of the fuse carrier group is installed in the fuse tube of the fuse carrier group below the upper contact of the fuse carrier group, the upper end of the fuse of the fuse carrier group contacts the lower end of the upper contact of the fuse carrier group, the lower end of the fuse of the fuse carrier group extends out of the fuse tube of the fuse carrier group and is fixed on the lower contact of the fuse carrier group; An insulating cylinder is fixed in the insulating outer sleeve, and the insulating cylinder is provided with a first inner step, a second inner step and a third inner step arranged in sequence from top to bottom, an upper contact group electrode connecting inner thread is provided on the inner wall of the insulating cylinder corresponding to the upper part of the first inner step, and a base group lower terminal seat connecting outer thread is provided on the outer circle of the lower end of the insulating cylinder; The upper contact group is installed as a whole in the insulating cylinder, the insulating cylinder connecting external thread on the upper contact group electrode is meshed with the upper contact group electrode connecting internal thread on the insulating cylinder, high-temperature epoxy glue is provided between the insulating cylinder connecting external thread on the upper contact group electrode and the upper contact group electrode connecting internal thread on the insulating cylinder, the upper contact group electrode connecting external thread on the upper terminal is meshed with the upper terminal connecting internal thread on the upper contact group electrode, high-temperature conductive glue is provided between the upper contact group electrode connecting external thread on the upper terminal and the upper terminal connecting internal thread on the upper contact group electrode, the upper contact group contact seat and the insulating cylinder are clearance-matched, an arc-extinguishing tube is installed between the second inner step and the third inner step of the insulating cylinder, the upper contact group contact seat connecting internal thread on the arc-extinguishing rod is meshed with the arc-extinguishing rod connecting external thread on the upper contact group contact seat, the arc-extinguishing rod is located on the inner side of the arc-extinguishing tube, and the connection The connector is sleeved on the outside of the middle part of the insulating cylinder, high-temperature epoxy glue is provided between the inner circle of the connector and the outer circle of the middle part of the insulating cylinder, part of the connector extends out of the insulating jacket, the base group is fixed as a whole to the lower end of the insulating cylinder, the insulating cylinder connecting internal thread on the lower terminal block of the base group is engaged with the connecting external thread of the lower terminal block of the base group on the insulating cylinder, high-temperature epoxy glue is provided between the insulating cylinder connecting internal thread on the lower terminal block of the base group and the connecting external thread of the lower terminal block of the base group on the insulating cylinder, the lower contact group is fixed as a whole to the lower surface of the lower terminal block of the base group, the connecting external thread of the lower terminal block of the base group on the lower terminal terminal is engaged with the lower terminal mounting internal thread hole on the lower terminal block of the base group, and high-temperature conductive glue is provided between the connecting external thread of the lower terminal block of the base group on the lower terminal terminal and the lower terminal mounting internal thread hole on the lower terminal block of the base group; The fuse-carrying component group is installed as a whole in the spring contact piece of the lower contact group. The spring contact piece of the lower contact group clamps the lower contact of the fuse-carrying component group through the lower contact group hoop spring. The upper contact of the fuse-carrying component group is inserted between the arc-extinguishing rod and the arc-extinguishing tube. The upper end of the upper contact of the fuse-carrying component group contacts the contact seat of the upper contact group.

[0007] Preferably, the insulating jacket is a multi-section umbrella-shaped structure.

[0008] Preferably, 3-6 lower contact group elastic contact pieces evenly distributed around the fuse-carrying member through-hole are fixed on the lower surface of the lower contact group fixing plate by lower contact group rivets.

[0009] The manufacturing method of the modular enclosed fuse with a sensing contact comprises the following steps: S1, heat and soften the arc-extinguishing tube and place it between the second inner step and the third inner step of the insulating tube; S2. Tighten and fix the arc-extinguishing rod and the upper contact group contact seat together through the upper contact group contact seat connecting internal threads and the arc-extinguishing rod connecting external threads, apply high-temperature epoxy glue on the insulating tube connecting external threads of the upper contact group electrode, put the upper contact group and the arc-extinguishing rod into the insulating tube, make the bottom surface of the upper contact group contact seat contact the top surface of the arc-extinguishing tube, tighten and fix the upper contact group electrode and the insulating tube through the insulating tube connecting external threads and the upper contact group electrode connecting internal threads, eliminate the gap between the insulating tube connecting external threads of the upper contact group electrode and the upper contact group electrode connecting internal threads of the insulating tube, and form a sealing protective layer; S3, the lower contact group is fixed on the bottom surface of the base group lower terminal block of the base group through the lower contact group fixing plate and bolted, high-temperature epoxy glue is applied on the base group lower terminal block connecting external threads of the insulating tube, the base group lower terminal block and the insulating tube are tightened and fixed together through the insulating tube connecting internal threads and the base group lower terminal block connecting external threads, so that the gap between the insulating tube connecting internal threads of the base group lower terminal block and the base group lower terminal block connecting external threads of the insulating tube are eliminated to form a sealing protective layer; S4. Apply high-temperature epoxy glue on the middle outer circle of the insulating cylinder, insert the connecting piece into the middle outer circle of the insulating cylinder, and then fix the connecting piece with a rivet pin; S5, applying high temperature conductive glue to the upper contact group electrode connection external thread of the upper terminal, and tightening and fixing the upper terminal and the upper contact group electrode together through the upper contact group electrode connection external thread and the upper terminal connection internal thread; S6, applying high temperature conductive glue on the external thread of the base assembly lower terminal, tightening and fixing the lower terminal and the base assembly lower terminal through the base assembly lower terminal assembly external thread and the lower terminal mounting internal thread hole to form a core body; S7. Apply coupling agent to all the bonding surfaces of the core and the insulating jacket, let them dry, and then put them in a 90-120℃ oven to dry for 2-4 hours; S8, after the positioning block is installed in the core body, the core body is placed in the preheated mold, and the relative positions of the upper terminal, the lower terminal and the connector of the core body are calibrated by adjusting the position of the positioning block; S9, after calibration, mold closing, after mold closing, high temperature silicone rubber is injected, and the rubber is vulcanized and molded according to the vulcanization process to form an insulating jacket, and the insulating jacket and the core body cooperate to form a fuse base, and after the vulcanization is completed, the fuse base is taken out and the positioning block is removed; S10, assembling the fuse carrier into the contact pieces of the lower contact group to obtain a base modular enclosed fuse with a sensing contact.

[0010] The present invention has the following advantages: 1. The present invention places all live parts inside the insulating jacket, i.e., the contact built-in structure, which solves the problems of foreign body contact, fuse contact displacement or jamming caused by the exposed conductive part of the traditional drop-out fuse, and solves the difficulties of monitoring the operating status of the fuse and locating the fault point. It also solves the problem that the manufacturing process of the closed-type fuse contact built-in is complicated and cumbersome, affecting the product qualification rate and unstable quality.

[0011] 2. The manufacturing method of the present invention simplifies the assembly process of the fuse base to the greatest extent, and the integrated composite jacket vulcanization process greatly improves the qualification rate and quality of the product.

[0012] 3. The present invention implants the temperature sensor inside the contact seat of the upper contact group, which is the most direct measurement result. The accuracy of the measurement is guaranteed, and the problem of inaccurate measurement results caused by indirect measurement of the product contact temperature is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention.

[0014] Figure 2 It is an enlarged schematic diagram of the upper contact group in the present invention.

[0015] Figure 3 It is an enlarged schematic diagram of the lower contact group in the present invention.

[0016] Figure 4 It is an enlarged schematic diagram of the fuse carrier assembly in the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] A base modular enclosed fuse with sensing contacts, such as Figure 1 As shown, it includes an upper terminal 11, an upper contact group 12, an arc extinguishing tube 13, an arc extinguishing rod 14, a lower contact group 15, a base group 16, a lower terminal 17, a connector 18, an insulating jacket 19, an insulating tube 110, a base group body 161, a base group lower terminal seat 162 and a fuse carrier group 2; The outer circle of the lower end of the upper terminal 11 is provided with an upper contact group electrode connecting external thread; like Figure 2As shown, the upper contact group 12 includes an upper contact group electrode 121, an upper contact group conductor 122, an upper contact group spring 123, an upper contact group temperature sensor 124 and an upper contact group contact seat 125; an upper terminal connection internal thread is provided on the upper contact group electrode 121, an insulating tube connection external thread is provided on the outer circle of the upper contact group electrode 121, an upper contact group contact seat 125 is provided below the upper contact group electrode 121, and an arc extinguishing rod connection external thread is provided on the outer circle of the upper contact group contact seat 125 The upper contact group contact seat 125 is provided with an upper contact group temperature sensor 124, the upper contact group electrode 121 is connected with the upper contact group contact seat 125 through an upper contact group conductor 122, the upper end of the upper contact group conductor 122 is installed in the upper contact group electrode 121, the lower end of the upper contact group conductor 122 passes through the upper contact group temperature sensor 124 and is installed in the upper contact group contact seat 125, and an upper contact group spring 123 is installed between the upper contact group electrode 121 and the upper contact group contact seat 125; The upper end of the arc extinguishing rod 14 is provided with an internal thread for connecting the upper contact group contact seat; like Figure 3 As shown, the lower contact group 15 comprises a lower contact group rivet 151, a lower contact group fixing plate 152, a lower contact group elastic contact piece 153 and a lower contact group hoop spring 154; a fuse-carrying member through hole is provided on the lower contact group fixing plate 152, a plurality of lower contact group elastic contact pieces 153 evenly distributed around the fuse-carrying member through hole are fixed on the lower surface of the lower contact group fixing plate 152 through the lower contact group rivet 151, and a lower contact group hoop spring 154 is sleeved on the outer side of the lower contact group elastic contact piece 153; The base assembly 16 includes a base assembly body 161 and a base assembly lower wiring seat 162 fixed together; the base assembly lower wiring seat 162 is fixed in the base assembly body 161, and an internal threaded hole for mounting a lower wiring terminal is provided on the base assembly lower wiring seat 162, and an insulating tube is connected to the inner circle of the base assembly lower wiring seat 162. The inner end outer circle of the lower terminal 17 is provided with a base assembly lower terminal seat connecting external thread; like Figure 4 As shown, the fuse group 2 includes an upper contact 21 of the fuse group, a fuse tube 22 of the fuse group, a lower contact 23 of the fuse group and a fuse 24 of the fuse group; the lower end of the upper contact 21 of the fuse group is provided with an outer thread of the upper contact of the fuse group, and the upper end of the fuse tube 22 of the fuse group is provided with an inner thread of the fuse tube of the fuse group, and the upper contact 21 of the fuse group is installed on the fuse group by meshing the outer thread of the upper contact of the fuse group with the inner thread of the fuse tube of the fuse group The upper end of the fuse tube 22 of the fuse group is provided with a lower contact 23 of the fuse group, and a fuse 24 of the fuse group is provided in the fuse tube 22 of the fuse group below the upper contact 21 of the fuse group. The upper end of the fuse 24 of the fuse group contacts the lower end of the upper contact 21 of the fuse group, and the lower end of the fuse 24 of the fuse group extends out of the fuse tube 22 of the fuse group and is fixed on the lower contact 23 of the fuse group. An insulating cylinder 110 is fixed in the insulating jacket 19. The insulating cylinder 110 is provided with a first inner step, a second inner step and a third inner step arranged in sequence from top to bottom. An inner thread for connecting the upper contact group electrode is provided on the inner wall of the insulating cylinder 110 corresponding to the upper part of the first inner step, and an outer thread for connecting the lower terminal block of the base group is provided on the outer circle of the lower end of the insulating cylinder 110. The upper contact group 12 is installed as a whole in the insulating cylinder 110, the insulating cylinder connection external thread on the upper contact group electrode 121 is meshed with the upper contact group electrode connection internal thread on the insulating cylinder 110, high-temperature epoxy glue is provided between the insulating cylinder connection external thread on the upper contact group electrode 121 and the upper contact group electrode connection internal thread on the insulating cylinder 110, the upper contact group electrode connection external thread on the upper terminal 11 is meshed with the upper terminal connection internal thread on the upper contact group electrode 121, high-temperature conductive glue is provided between the upper contact group electrode connection external thread on the upper terminal 11 and the upper terminal connection internal thread on the upper contact group electrode 121, the upper contact group contact seat 125 and the insulating cylinder 110 are clearance-matched, an arc-extinguishing tube 13 is installed between the second inner step and the third inner step of the insulating cylinder 110, the upper contact group contact seat connection internal thread on the arc-extinguishing rod 14 is meshed with the arc-extinguishing rod connection external thread on the upper contact group contact seat 125, the arc-extinguishing rod 14 is located on the inner side of the arc-extinguishing tube 13, and the arc-extinguishing rod 14 is located on the inner side of the arc-extinguishing tube 13. The connector 18 is sleeved on the outer middle part of the insulating tube 110, and high-temperature epoxy glue is provided between the inner circle of the connector 18 and the outer circle of the middle part of the insulating tube 110. Part of the connector 18 extends out of the insulating jacket 19. The base group 16 is fixed as a whole to the lower end of the insulating tube 110. The insulating tube connecting internal thread on the base group lower terminal block 162 is meshed with the base group lower terminal block connecting external thread on the insulating tube 110. High-temperature epoxy glue is provided between the insulating tube connecting internal thread on the base group lower terminal block 162 and the base group lower terminal block connecting external thread on the insulating tube 110. The lower contact group 15 is fixed as a whole to the lower surface of the base group lower terminal block 162. The base group lower terminal block connecting external thread on the lower terminal 17 is meshed with the lower terminal mounting internal thread hole on the base group lower terminal block 162. High-temperature conductive glue is provided between the base group lower terminal block connecting external thread on the lower terminal 17 and the lower terminal mounting internal thread hole on the base group lower terminal block 162. The fuse-carrying component group 2 is installed as a whole in the lower contact group spring contact piece 153, and the lower contact group spring contact piece 153 clamps the lower contact 23 of the fuse-carrying component group through the lower contact group hoop spring 154. The upper contact 21 of the fuse-carrying component group is inserted between the arc-extinguishing rod 14 and the arc-extinguishing tube 13, and the upper end of the upper contact 21 of the fuse-carrying component group contacts with the upper contact group contact seat 125.

[0019] The insulating jacket 19 is a multi-section umbrella-shaped structure.

[0020] 3 to 6 lower contact group spring contact pieces 153 evenly distributed around the fuse-carrying hole are fixed on the lower surface of the lower contact group fixing plate 152 through lower contact group rivets 151 .

[0021] The manufacturing method of the modular enclosed fuse with a sensing contact comprises the following steps: S1, heat and soften the arc-extinguishing tube 13 and then put it between the second inner step and the third inner step of the insulating tube 110; S2, tighten and fix the arc-extinguishing rod 14 and the upper contact group contact seat 125 together through the upper contact group contact seat connecting internal threads and the arc-extinguishing rod connecting external threads, apply high-temperature epoxy glue on the insulating tube connecting external threads of the upper contact group electrode 121, put the upper contact group 12 and the arc-extinguishing rod 14 into the insulating tube 110, make the bottom surface of the upper contact group contact seat 125 contact the top surface of the arc-extinguishing tube 13, tighten and fix the upper contact group electrode 121 and the insulating tube 110 together through the insulating tube connecting external threads and the upper contact group electrode connecting internal threads, eliminate the gap between the insulating tube connecting external threads of the upper contact group electrode 121 and the upper contact group electrode connecting internal threads of the insulating tube 110, and form a sealing protective layer; S3, the lower contact group 15 is fixedly mounted on the bottom surface of the base group lower terminal block 162 of the base group 16 through the lower contact group fixing plate 152 and bolted, and high-temperature epoxy glue is applied on the base group lower terminal block connecting external threads of the insulating tube 110, and the base group lower terminal block 162 and the insulating tube 110 are tightened and fixed together through the insulating tube connecting internal threads and the base group lower terminal block connecting external threads, so that the gap between the insulating tube connecting internal threads of the base group lower terminal block 162 and the base group lower terminal block connecting external threads of the insulating tube 110 is eliminated, and a sealing protective layer is formed; S4, applying high temperature epoxy glue on the middle outer circle of the insulating tube 110, inserting the connecting piece 18 into the middle outer circle of the insulating tube 110, and then fixing the connecting piece 18 with a rivet pin; S5, applying high temperature conductive glue to the upper contact group electrode connection external thread of the upper terminal 11, and tightening and fixing the upper terminal 11 and the upper contact group electrode 121 together through the upper contact group electrode connection external thread and the upper terminal connection internal thread; S6, applying high temperature conductive glue to the external thread of the base assembly lower terminal 17, tightening and fixing the lower terminal 17 and the base assembly lower terminal 162 together through the base assembly lower terminal assembly external thread and the lower terminal mounting internal thread hole to form a core body; S7. Apply coupling agent to all the bonding surfaces of the core and the insulating jacket, let them dry, and then put them in a 90-120℃ oven to dry for 2-4 hours; S8, after the positioning block is installed in the core body, it is placed in the preheated mold, and the relative positions of the upper terminal 11, the lower terminal 17 and the connector 18 of the core body are calibrated by adjusting the position of the positioning block; S9, after calibration, the mold is closed, and high-temperature silicone rubber is injected after the mold is closed. The rubber is vulcanized and molded according to the vulcanization process to form an insulating jacket 19. The insulating jacket 19 cooperates with the core body to form a fuse base. After the vulcanization is completed, the fuse base is taken out and the positioning block is removed; S10, installing the fuse carrier group 2 into the contact piece 153 of the lower contact group to obtain a base modular enclosed fuse with a sensing contact.

[0022] The base modular enclosed fuse with sensing contact of the present invention is installed on the high voltage side of the distribution transformer or the distribution branch line during actual use, and is used for overcurrent protection of the distribution transformer and the distribution branch line. The upper terminal 11 is connected to the line incoming line (upper lead), the lower terminal 17 is connected to the outgoing line (lower lead), and the connector 18 is connected to the cross arm (ground).

[0023] The present invention adopts a modular design, the insulating jacket 19 is made of a silicone rubber composite material, and the temperature sensor 124 is implanted in the upper contact group contact seat 125 of the upper contact group 12. In the closed state, the fuse carrier group 2 is placed in the closed insulating cylinder 110, achieving a fully enclosed and fully insulated effect. Compared with the traditional drop-out fuse, it has superior environmental adaptability and stability, and is particularly suitable for areas with harsh climate, complex natural environment, and severe air pollution.

[0024] When a short circuit or excessive current occurs, the fault current causes the fuse 24 to melt rapidly to form an arc. The polymer gas-generating material built into the melting tube instantly releases a large amount of gas under the high temperature of the arc, and blows strongly longitudinally along the pipeline, and the arc is rapidly elongated and extinguished. After the fuse 24 melts, the lower contact of the fuse carrier 24 loses its pulling force, and the fuse carrier 24 falls to form a fracture.

[0025] When it is necessary to pull the load, the fuse-carrying component group 2 is pulled apart with an insulating rod. At this time, the upper contact 21 of the fuse-carrying component group 2 is separated from the upper contact group contact seat 125, and an arc is generated between the two. The arc is elongated in the slit formed by the arc-extinguishing tube 13 and the arc-extinguishing rod 14. At the same time, the arc-extinguishing tube 13 and the arc-extinguishing rod 14 generate gas, which extinguishes the arc when the current passes through zero.

[0026] The modular enclosed fuse with a base and a sensing contact provided by the present invention and the manufacturing method thereof place all the live parts inside the insulating jacket, i.e., a contact built-in structure, which solves the problems of foreign body contact, fuse contact displacement or jamming caused by the exposed conductive part of the traditional drop-out fuse, and solves the difficulties of monitoring the operating status of the fuse and locating the fault point. It also solves the problem that the manufacturing process of the enclosed fuse contact built-in is complicated and cumbersome, affecting the product qualification rate and unstable quality.

[0027] The manufacturing method of the present invention simplifies the assembly process of the fuse base to the greatest extent, and the integrated composite jacket vulcanization process greatly improves the qualification rate and quality of the product.

[0028] It is common for fuses to have quality problems during use or to fail due to environmental influences, which affect the normal operation of the power grid. Most of the problems are caused by poor contact points, which lead to heating and eventually burn the contacts. The present invention implants the temperature sensor 124 inside the upper contact group contact seat 125, which is a most direct measurement structure. The accuracy of the measurement is guaranteed, which solves the problem of indirect and inaccurate temperature measurement of the product contacts.

[0029] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A base modular enclosed fuse with a sensing contact, characterized by: It comprises an upper terminal (11), an upper contact group (12), an arc extinguishing tube (13), an arc extinguishing rod (14), a lower contact group (15), a base group (16), a lower terminal (17), a connecting piece (18), an insulating jacket (19), an insulating tube (110), a base group body (161), a base group lower terminal seat (162) and a fuse carrier group (2); The outer circle of the lower end of the upper terminal (11) is provided with an upper contact group electrode connecting external thread; The upper contact group (12) comprises an upper contact group electrode (121), an upper contact group conductor (122), an upper contact group spring (123), an upper contact group temperature sensor (124) and an upper contact group contact seat (125); an upper terminal connection internal thread is provided on the upper contact group electrode (121), an insulating tube connection external thread is provided on the outer circle of the upper contact group electrode (121), an upper contact group contact seat (125) is provided below the upper contact group electrode (121), an arc extinguishing rod connection external thread is provided on the outer circle of the upper contact group contact seat (125), and an arc extinguishing rod connection external thread is provided on the outer circle of the upper contact group contact seat (125). An upper contact group temperature sensor (124) is installed in the upper contact group contact seat (125); the upper contact group electrode (121) is connected to the upper contact group contact seat (125) via an upper contact group conductor (122); the upper end of the upper contact group conductor (122) is installed in the upper contact group electrode (121); the lower end of the upper contact group conductor (122) passes through the upper contact group temperature sensor (124) and is installed in the upper contact group contact seat (125); an upper contact group spring (123) is installed between the upper contact group electrode (121) and the upper contact group contact seat (125); The upper end of the arc extinguishing rod (14) is provided with an internal thread for connecting the upper contact group contact seat; The lower contact group (15) comprises a lower contact group rivet (151), a lower contact group fixing plate (152), a lower contact group elastic contact piece (153) and a lower contact group hoop spring (154); a fuse-carrying member through hole is provided on the lower contact group fixing plate (152); a plurality of lower contact group elastic contact pieces (153) evenly distributed around the fuse-carrying member through hole are fixed on the lower surface of the lower contact group fixing plate (152) via the lower contact group rivet (151); and a lower contact group hoop spring (154) is sleeved on the outer side of the lower contact group elastic contact piece (153); The base assembly (16) comprises a base assembly body (161) and a base assembly lower wiring seat (162) fixed together; the base assembly lower wiring seat (162) is fixed in the base assembly body (161), a lower wiring terminal mounting internal thread hole is provided on the base assembly lower wiring seat (162), and an insulating tube connecting internal thread is provided on the inner circle of the base assembly lower wiring seat (162); The inner end outer circle of the lower terminal (17) is provided with an external thread for connecting the lower terminal seat of the base assembly; The fuse carrier group (2) comprises a fuse carrier group upper contact (21), a fuse carrier group fusion tube (22), a fuse carrier group lower contact (23) and a fuse carrier group fuse (24); the lower end of the fuse carrier group upper contact (21) is provided with a fuse carrier group upper contact external thread, the upper end of the fuse carrier group fusion tube (22) is provided with a fuse carrier group fusion tube internal thread, and the fuse carrier group upper contact (21) is mounted on the fuse carrier group fusion tube by meshing the fuse carrier group upper contact external thread with the fuse carrier group fusion tube internal thread. The upper end of the fuse group (22) is provided with a fuse group lower contact (23) installed on the outer side of the lower end of the fuse group fuse tube (22), and a fuse member (24) of the fuse group is installed in the fuse group fuse tube (22) below the upper contact (21) of the fuse group, the upper end of the fuse member (24) of the fuse group contacts the lower end of the upper contact (21) of the fuse group, and the lower end of the fuse member (24) of the fuse group extends out of the fuse group fuse tube (22) and is fixed on the lower contact (23) of the fuse group; An insulating cylinder (110) is fixed in the insulating outer sleeve (19), the insulating cylinder (110) being provided with a first inner step, a second inner step and a third inner step arranged in sequence from top to bottom, an upper contact group electrode connection inner thread being provided on the inner wall of the insulating cylinder (110) above the first inner step, and a base group lower terminal seat connection outer thread being provided on the outer circle of the lower end of the insulating cylinder (110); The upper contact group (12) is integrally installed in the insulating tube (110); the insulating tube connection external thread on the upper contact group electrode (121) is meshed with the upper contact group electrode connection internal thread on the insulating tube (110); high-temperature epoxy glue is provided between the insulating tube connection external thread on the upper contact group electrode (121) and the upper contact group electrode connection internal thread on the insulating tube (110); the upper contact group electrode connection external thread on the upper terminal (11) is meshed with the upper terminal connection internal thread on the upper contact group electrode (121); the upper terminal (11) is 1) is provided with a high temperature conductive adhesive between the upper contact group electrode connecting external thread on the upper contact group electrode (121) and the upper terminal connecting internal thread on the upper contact group electrode (121); the upper contact group contact seat (125) and the insulating tube (110) are clearance-matched; an arc-extinguishing tube (13) is installed between the second inner step and the third inner step of the insulating tube (110); the upper contact group contact seat connecting internal thread on the arc-extinguishing rod (14) is meshed with the arc-extinguishing rod connecting external thread on the upper contact group contact seat (125); the arc-extinguishing rod (14) is located on the inner side of the arc-extinguishing tube (13); The connecting piece (18) is sleeved on the outer middle part of the insulating tube (110), and a high-temperature epoxy adhesive is provided between the inner circle of the connecting piece (18) and the outer circle of the middle part of the insulating tube (110). A portion of the connecting piece (18) extends out of the insulating jacket (19). The base assembly (16) is fixed as a whole to the lower end of the insulating tube (110). The insulating tube connecting inner thread on the base assembly lower wiring seat (162) is engaged with the base assembly lower wiring seat connecting outer thread on the insulating tube (110). The insulating tube connecting inner thread on the base assembly lower wiring seat (162) is engaged with the insulating tube connecting outer thread on the insulating tube (110). A high-temperature epoxy adhesive is provided between the thread and the external thread connecting the lower terminal block of the base group on the insulating tube (110); the lower contact group (15) is fixed as a whole to the lower surface of the lower terminal block of the base group (162); the external thread connecting the lower terminal block of the base group on the lower terminal (17) is engaged with the lower terminal mounting internal thread hole on the lower terminal block of the base group (162); and a high-temperature conductive adhesive is provided between the external thread connecting the lower terminal block of the base group on the lower terminal (17) and the lower terminal mounting internal thread hole on the lower terminal block of the base group (162); The fuse carrier group (2) is integrally mounted in a lower contact group spring contact piece (153); the lower contact group spring contact piece (153) holds the fuse carrier group lower contact (23) via a lower contact group hoop spring (154); the fuse carrier group upper contact (21) is inserted between the arc extinguishing rod (14) and the arc extinguishing tube (13); and the upper end of the fuse carrier group upper contact (21) contacts the upper contact group contact seat (125).

2. The base modular enclosed fuse with sensing contacts as claimed in claim 1, characterized in that: The insulating jacket (19) is a multi-section umbrella-shaped structure.

3. The base modular enclosed fuse with sensing contact as claimed in claim 1, characterized in that: The lower surface of the lower contact group fixing plate (152) is fixed with 3 to 6 lower contact group elastic contact pieces (153) evenly distributed around the fuse carrier through hole via lower contact group rivets (151).

4. The method for manufacturing a base modular enclosed fuse with a sensing contact as claimed in claim 1, characterized in that The method comprises the following steps: S1, heating and softening the arc-extinguishing tube (13), and then placing the arc-extinguishing tube (13) between the second inner step and the third inner step of the insulating tube (110); S2, tightening and fixing the arc extinguishing rod (14) and the upper contact group contact seat (125) together through the upper contact group contact seat connecting internal threads and the arc extinguishing rod connecting external threads, applying high-temperature epoxy glue on the insulating tube connecting external threads of the upper contact group electrode (121), placing the upper contact group (12) and the arc extinguishing rod (14) into the insulating tube (110), making the bottom surface of the upper contact group contact seat (125) contact the top surface of the arc extinguishing tube (13), tightening and fixing the upper contact group electrode (121) and the insulating tube (110) together through the insulating tube connecting external threads and the upper contact group electrode connecting internal threads, eliminating the gap between the insulating tube connecting external threads of the upper contact group electrode (121) and the upper contact group electrode connecting internal threads of the insulating tube (110), and forming a sealing protective layer; S3, the lower contact group (15) is fixedly mounted on the bottom surface of the base group lower terminal block (162) of the base group (16) through the lower contact group fixing plate (152) and bolted, and high-temperature epoxy glue is applied to the base group lower terminal block connecting external threads of the insulating tube (110), and the base group lower terminal block (162) and the insulating tube (110) are tightened and fixed together through the insulating tube connecting internal threads and the base group lower terminal block connecting external threads, so that the gap between the insulating tube connecting internal threads of the base group lower terminal block (162) and the base group lower terminal block connecting external threads of the insulating tube (110) is eliminated, and a sealing protective layer is formed; S4, applying high temperature epoxy glue on the middle outer circle of the insulating tube (110), inserting the connecting piece (18) into the middle outer circle of the insulating tube (110), and then fixing the connecting piece (18) with a rivet pin; S5, applying high temperature conductive glue to the upper contact group electrode connection external thread of the upper terminal (11), and tightening and fixing the upper terminal (11) and the upper contact group electrode (121) together through the upper contact group electrode connection external thread and the upper terminal connection internal thread; S6, applying high temperature conductive glue to the external thread of the base assembly lower terminal (17), tightening and fixing the lower terminal (17) and the base assembly lower terminal (162) together through the base assembly lower terminal assembly external thread and the lower terminal mounting internal thread hole to form a core body; S7. Apply coupling agent to all the bonding surfaces of the core and the insulating jacket, let them dry, and then put them in a 90-120℃ oven to dry for 2-4 hours; S8, after the positioning block is installed in the core body, it is placed in the preheated mold, and the relative positions of the upper terminal (11), the lower terminal (17) and the connector (18) of the core body are calibrated by adjusting the position of the positioning block; S9, after calibration, the mold is closed, and after the mold is closed, high-temperature silicone rubber is injected, and the rubber is vulcanized and molded according to the vulcanization process to form an insulating jacket (19), and the insulating jacket (19) cooperates with the core body to form a fuse base. After the vulcanization is completed, the fuse base is taken out and the positioning block is removed; S10, installing the fuse carrier group (2) into the contact piece (153) of the lower contact group to obtain a base modular enclosed fuse with a sensing contact.

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