CN212209410U - Fuse protector - Google Patents

Abstract

The utility model relates to a fuse, which comprises an insulating porcelain bushing, wherein the upper end of the insulating porcelain bushing is connected with an upper wiring seat, and the lower end of the insulating porcelain bushing is connected with a lower wiring seat; the upper end in the insulating porcelain sleeve is provided with an upper static contact body, and the lower end in the insulating porcelain sleeve is provided with a lower static contact body; the arc extinguishing tube is installed between the upper static contact body and the lower static contact body, the rubber base is installed at the bottom end of the insulating porcelain sleeve, the insulating cylinder is installed on the periphery of the upper static contact body, and the isolation barrel is arranged outside the upper insulating cylinder. The utility model provides a fuse has set up the isolation barrel in the periphery of last insulating cylinder, has blocked the air that exists in the space, fine improvement the effect of arc extinguishing, has established the basis of consolidating for the development of fuse.

Description

Fuse protector

Technical Field

The utility model relates to a circuit protection device technical field, concretely relates to fuse.

Background

The fuse is an electric appliance which fuses a melt by heat generated by itself to open a circuit when a current exceeds a predetermined value. Therefore, the protective device is widely applied to high and low voltage distribution systems, control systems and electric equipment, and is one of the most commonly applied protective devices as a short circuit protector and an overcurrent protector.

The fuse on the market can not reach the standard when extinguishing the arc, and the number of times of arc extinguishing generally can not reach the use requirement of three times, therefore, the development of the fuse is limited.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a fuse.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the fuse comprises an insulating porcelain bushing, wherein the upper end of the insulating porcelain bushing is connected with an upper wiring seat, and the lower end of the insulating porcelain bushing is connected with a lower wiring seat; the upper end in the insulating porcelain sleeve is provided with an upper static contact body, and the lower end in the insulating porcelain sleeve is provided with a lower static contact body; the arc extinguishing tube is installed between the upper static contact body and the lower static contact body, the rubber base is installed at the bottom end of the insulating porcelain sleeve, the insulating cylinder is installed on the periphery of the upper static contact body, and the isolation barrel is arranged outside the upper insulating cylinder.

Further, the upper stationary contact is electrically connected with the upper wire holder, and the upper stationary contact includes a contact spring and a contact cover covering the contact spring.

Further, the lower static contact body is electrically connected with the lower wiring seat.

Further, the arc extinguishing tube comprises an upper moving contact, a lower static contact, an arc extinguishing tube spring and a fuse wire, wherein the fuse wire is installed to be electrically connected with the upper moving contact and the lower static contact so as to enable the arc extinguishing tube spring to be in a compressed state.

Further, the top of going up the insulating cylinder is equipped with joint portion, joint portion includes spacing boss and lug, the lug symmetry sets up the both sides at spacing boss.

Further, go up the stationary contact and include connecting screw, connecting screw stretches out the through-hole at insulating insulator top, with the binding post electricity of going up the connection terminal is connected.

The arc extinguishing tube is used for accommodating the arc extinguishing tube and is in clearance fit with the arc extinguishing tube.

Further, still include lower insulating cylinder support, lower insulating cylinder support install the bottom of lower insulating cylinder in order to support lower insulating cylinder.

Further, the lower stationary contact body includes the lower stationary contact body fixing ring, the lower stationary contact body fixing ring with the lower stationary contact body electric property butt, be provided with the threaded connection hole on the lower stationary contact body fixing ring, will through threaded fastener the binding post of lower junction box is connected to the threaded connection hole.

Further, the lower stationary contact body includes the screens dish, the screens dish has the holding the lower wiring seat wiring terminal's installation breach, the lower stationary contact body is fixed the ring and is installed extremely on the screens dish, makes the threaded connection hole correspond to the installation breach sets up.

Compared with the prior art, the utility model, have following advantage: the utility model provides a fuse has set up the isolation barrel in the periphery of last insulating cylinder, has blocked the air that exists in the space, fine improvement the effect of arc extinguishing, has established the basis of consolidating for the development of fuse.

Drawings

Fig. 1 is a front view of a fuse according to a preferred embodiment of the present invention;

3 FIG. 3 2 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 31 3; 3

Figure 3 is a perspective view of an upper insulating cylinder of a fuse according to a preferred embodiment of the present invention;

fig. 4 is a schematic structural view of an upper stationary contact of a fuse according to a preferred embodiment of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. insulating porcelain bushing, 2, upper wire holder, 3, lower wire holder, 4, upper static contact body, 5, lower static contact body, 6, arc extinguishing tube, 7, upper insulating cylinder, 8, lower insulating cylinder, 9, rubber base, 10, isolation barrel, 42, connecting stud, 52, clamping disc, 521, installation gap, 71, clamping part, 711, limiting boss, 712 and lug

Detailed Description

The principles and features of the present invention are described below, with the examples being given only for the purpose of illustration and not for the purpose of limiting the scope of the invention.

As shown in fig. 1 and 2, the utility model provides a fuse, which comprises an insulating porcelain bushing 1, wherein the upper end of the insulating porcelain bushing 1 is connected with an upper wire holder 2, and the lower end is connected with a lower wire holder 3; the inside upper end of insulating insulator 1 is equipped with stationary contact 4, it is connected with last connection terminal 2 electricity to go up stationary contact 4, it includes contact spring, cover to go up stationary contact 4 contact cover and connecting stud 42 of contact spring, connecting stud 42 stretches out the through-hole at 1 top of insulating insulator, with the binding post electricity of going up connection terminal 2 is connected. The lower end in the insulating porcelain sleeve 1 is provided with a lower static contact body 5, and the lower static contact body 5 is electrically connected with the lower wiring seat 3; an arc extinguishing tube 6 is arranged between the upper static contact 4 and the lower static contact 5, the arc extinguishing tube 6 comprises an upper moving contact, a lower static contact, an arc extinguishing tube spring and a fuse wire, and the fuse wire is arranged to be electrically connected with the upper moving contact and the lower static contact so as to enable the arc extinguishing tube spring to be in a compressed state. The bottom end of the insulating porcelain bushing 1 is provided with a rubber base 9, and the rubber base 9 is of an integrated structure. The fuse still includes insulating cylinder 7, is equipped with the isolation barrel in the outside of last insulating cylinder, the top of going up insulating cylinder 7 is equipped with joint portion 71, joint portion 71 includes spacing boss 711 and lug 712, lug 712 symmetry sets up the both sides at spacing boss 711.

The fuse further comprises a lower insulating cylinder 8 and a lower insulating cylinder support, wherein the lower insulating cylinder 8 is used for accommodating the arc extinguishing tube 6 and is in clearance fit with the arc extinguishing tube 6. The lower insulation barrel support is installed at the bottom of the lower insulation barrel 8 to support the lower insulation barrel 8.

The lower static contact body 5 comprises a lower static contact body fixing ring, the lower static contact body fixing ring and the lower static contact body 5 electric butt, a threaded connecting hole is formed in the lower static contact body fixing ring, and the lower wiring seat 3 wiring terminal is connected to the threaded connecting hole through a threaded fastener. Lower stationary contact 5 includes screens dish 52, screens dish 52 has the holding down the wire holder wiring terminal's installation breach, the solid fixed ring of lower stationary contact installs extremely on screens dish 52, makes the threaded connection hole correspond to installation breach 521 sets up.

The utility model discloses a fuse includes insulator 1, goes up connection terminal 2, lower connection terminal 3, goes up stationary contact 4, lower stationary contact 5, arc-extinguishing tube 6, goes up insulating cylinder 7.

The upper wiring seat 2 is connected to the upper end of the insulating porcelain sleeve 1, and the lower wiring seat 3 is connected to the lower end of the insulating porcelain sleeve 1. The upper static contact body 4 is positioned at the upper end in the insulating porcelain sleeve 1 and is electrically connected with the upper wiring seat 2, and the lower static contact body 5 is positioned at the lower end in the insulating porcelain sleeve 1 and is electrically connected with the lower wiring seat 3.

The upper stationary contact 4 includes a contact spring 41 and a contact cover 43 covering the contact spring 41. The contact housing 43 is adapted to be electrically connected to an upper movable contact 62 (described in more detail below) of the arc tube 6.

With continued reference to figure 2, an arc tube 6 is positioned between the upper stationary contact 4 and the lower stationary contact 5, the arc tube 6 including an upper movable contact 62, a lower stationary contact (not shown), an arc tube spring (not shown), and a fuse 61. A fuse 61 is mounted in electrical communication with the upper movable contact 62 and with the lower stationary contact to place the arc tube spring in compression.

Specifically, arc extinguishing tube 6 generally includes middle body, and arc extinguishing tube connecting piece 63 is installed to the upper end of middle body, goes up moving contact 62 and arc extinguishing tube connecting piece 63 threaded connection, and lower stationary contact overlaps at the middle part of middle body from the lower pot head of middle body down, makes lower stationary contact and middle body tight fit, and arc extinguishing tube spring housing establishes the below of stationary contact under, through the connection of fuse 61 with lower stationary contact, will extinguish tube spring in compression state. The fuse 61 can be blown out when the line is overloaded or short-circuited, so that the line is disconnected, and the purpose of protecting the transformer or the distribution line is achieved.

As shown in fig. 3, the top end of the upper insulating cylinder 7 has a clamping portion 71 for supporting the contact spring 41, and the upper insulating cylinder 7 is disposed in the upper movable contact 62 and clamped at the upper end of the upper movable contact 62 through the clamping portion 71. The lower stationary contact 5 is mounted in electrical contact with the lower stationary contact to place the contact spring 41 in a compressed state, and at this time, the upper movable contact 62 is positioned between the contact cover 43 and the contact spring 41, and the contact cover 43 and the upper movable contact 62 are electrically connected.

Therefore, when the lower static contact 5 is electrically abutted to the lower static contact, the contact spring 41 is in a compressed state through the clamping portion 71 of the upper insulating cylinder 7, the contact cover 43 is electrically connected with the upper moving contact 62, when the fuse wire 61 is fused, the impact of the upper moving contact 62 on the upper static contact 4 is buffered, and the explosion of the insulating porcelain bushing 1 is avoided.

The catching portion 71 may include a limit boss 711, and a maximum diameter of the limit boss 711 is smaller than a diameter of the contact spring 41 to limit the contact spring 41. Further, the clamping portion 71 includes symmetrically disposed lugs 712, and the lugs 712 are clamped on the upper movable contact 62. Therefore, the upper insulating cylinder 7 is more stably installed in the upper movable contact 62, and the contact spring 41 is further compressed, so that the electrical connection between the contact cover 43 and the upper movable contact 62 is more stable. Further, the contact cover 43 is provided with an opening 431 symmetrically along the axial direction of the contact spring 41, so that during the compression state of the contact spring 41, the lug 712 moves along the opening 431, and finally the contact cover 43 is electrically connected with the upper movable contact 62.

As shown in fig. 4, the upper stationary contact 4 may specifically comprise a connection stud 42 protruding out of a contact housing 43. The connecting stud 42 extends out of the through hole at the top of the insulating porcelain bushing 1 to be electrically connected with the wiring terminal of the upper wiring holder 2. Further, the connection stud 42 may be screw-coupled with a connection nut to fix the upper stationary contact 4 to the upper end inside the porcelain insulator 1.

The lower stationary contact 5 may specifically include a lower stationary contact fixing ring 51, the lower stationary contact fixing ring 51 is electrically abutted to the lower stationary contact, a thread connecting hole 511 is provided on the lower stationary contact fixing ring 51, and a terminal of the lower terminal holder 3 is connected to the thread connecting hole 511 by a thread fastener. Therefore, the lower wire holder 3, the lower static contact 5 and the lower static contact of the arc extinguishing tube 6 are electrically connected.

Preferably, in order to better support the lower stationary contact fixing ring 51, the lower stationary contact 5 may include a catching disc 52, the catching disc 52 having a mounting notch 521 to receive the lower wire holder 3, the lower stationary contact fixing ring 51 being mounted to the catching disc 52 such that the screw coupling hole 511 is disposed corresponding to the mounting notch 521. From this, lower wire holder 3 can pass through the through-hole on the lateral wall of the lower extreme of insulating porcelain 1, be connected with insulating porcelain 1 through the nut, and make lower wire holder 3's binding post stretch into insulating porcelain 1 in, and hold in installation breach 521, and installation breach 521 sets up with threaded connection hole 511 correspondingly, make lower wire holder 3's binding post can be conveniently, accurately be connected to threaded connection hole 511 through the screw in, and then realize lower wire holder 3 and lower static contact 5's electricity be connected.

Specifically, the lower stationary contact fixing ring 51 is uniformly provided with a plurality of lower stationary contacts 512 extending upward, and the lower stationary contacts are in electrical contact with the plurality of lower stationary contacts 512 in an engaging manner. Thereby, stable electrical connection between the lower stationary contact 5 and the lower stationary contact of the arc-extinguishing tube 6 is achieved.

Preferably, according to the utility model discloses a fuse can also include lower insulating cylinder 8, and lower insulating cylinder 8 is used for acceping arc-extinguishing tube 6, and with arc-extinguishing tube 6 clearance fit. Further preferably, according to the utility model discloses a fuse can also include lower insulating cylinder support 81, and lower insulating cylinder support 81 is installed in the bottom of insulating cylinder 8 down to supporting insulating cylinder 8 down, and a plurality of lower stationary contact 512 can stretch into lower insulating cylinder support 81 and be connected with lower stationary contact electricity.

Preferably, the fuse according to the present invention may further include a sealing assembly installed inside the lower port of the insulating porcelain 1 to support the arc extinguishing tube 6. Specifically, the sealing assembly may include a rubber base 91 and a rubber bottom plate 92, the rubber base 91 is installed inside the lower port of the insulator 1, and the rubber bottom plate 92 is installed at the bottom of the rubber base 91 to seal the fuse for normal use.

Hereinafter, an assembling process of the fuse according to the preferred embodiment of the present invention will be described in detail.

Firstly, an upper stationary contact 4 is arranged in an insulating porcelain sleeve 1, a connecting stud 42 extends out of a through hole in the top of the insulating porcelain sleeve 1, a leather gasket, a copper gasket and a copper nut are sequentially arranged on the connecting stud 42, the copper nut is screwed, the upper stationary contact 4 is positioned at the upper end in the insulating porcelain sleeve 1, a wiring terminal of an upper wiring seat 2 is wound on the residual threads of the connecting stud 42, and the other copper nut is in threaded connection with the connecting stud 42 and screwed; then, the upper insulating cylinder 7, the lower insulating cylinder 8 and the lower insulating cylinder bracket 81 are sequentially arranged, so that the lower end of the contact spring 41 is limited by a limit boss 711 of the clamping part 71 of the upper insulating cylinder 7; the insulating barrel 10 is filled again, so that the insulating barrel 10 just covers the periphery of the upper insulating barrel 7; the lower static contact fixing ring 51 is arranged on the clamping disc 52, so that the lower static contact 512 extends into the lower insulating cylinder bracket 81; then, the terminal of the lower terminal block 3 is connected to the lower stationary contact fixing ring 51; continuously loading the arc extinguishing tube 6 into the lower insulating cylinder 8, enabling the arc extinguishing tube to sequentially pass through the clamping disc 52 and the lower static contact body fixing ring 51, enabling the lower static contact body and the lower static contact body 512 to be clamped and electrically abutted, enabling the contact spring 41 to be in a compressed state, enabling the upper moving contact 62 to be located between the contact cover 43 and the contact spring 41, and enabling the contact cover 43 to be electrically connected with the upper moving contact 62; finally, the rubber base 91 and the rubber base plate 92 are sequentially loaded. When the fuse wire 61 is fused, the contact spring 41 and the arc-extinguishing tube spring are both relaxed to the original uncompressed state, so that the arc-extinguishing tube 6 is ejected from the lower insulating cylinder 8, and it should be noted that the rubber base 91 and the rubber chassis 92 are both provided with rubber openings for the arc-extinguishing tube 6 to pass through.

According to the utility model discloses a fuse, static contact body and lower static contact body electrical property butt under, through the joint portion of last insulating cylinder, make the contact spring be in compression state, when the fuse wire fusing, also cushioned the impact of moving the contact to last static contact body, avoided the burst of insulating porcelain cover to split.

To sum up, compared with the prior art, the utility model, have following advantage: the utility model provides a fuse has set up the isolation barrel in the periphery of last insulating cylinder, has blocked the air that exists in the space, fine improvement the effect of arc extinguishing, has established the basis of consolidating for the development of fuse.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The fuse comprises an insulating porcelain bushing (1), wherein the upper end of the insulating porcelain bushing (1) is connected with an upper wiring seat (2), and the lower end of the insulating porcelain bushing is connected with a lower wiring seat (3); an upper static contact body (4) is arranged at the upper end in the insulating porcelain sleeve (1), and a lower static contact body (5) is arranged at the lower end in the insulating porcelain sleeve (1); go up between static contact body (4) and the lower static contact body (5) installation arc-extinguishing tube (6), rubber base (9) are installed to the bottom of insulating insulator (1), go up the periphery of static contact body (4) and install insulating cylinder (7), its characterized in that, the outside of going up insulating cylinder (7) is equipped with keeps apart bucket (10).

2. A fuse as per claim 1, characterised in that said upper static contact (4) is electrically connected to the upper wire holder (2), said upper static contact (4) comprising a contact spring and a contact cage covering said contact spring.

3. A fuse as per claim 1, characterised in that said lower static contact (5) is electrically connected to the lower socket (3).

4. A fuse as per claim 1, characterised in that said arc-extinguishing tube (6) comprises an upper moving contact, a lower static contact, an arc-extinguishing tube spring and a fuse mounted in electrical connection with said upper moving contact and with said lower static contact so as to place said arc-extinguishing tube spring in compression.

5. A fuse as per claim 1, characterized in that the top of the upper insulating cylinder (7) is equipped with a snap-in part (71), the snap-in part (71) includes a limit boss (711) and lugs (712), the lugs (712) are symmetrically arranged on both sides of the limit boss (711).

6. A fuse as per claim 1, characterised in that said upper static contact (4) comprises a connection stud (42), said connection stud (42) protruding through a through hole in the top of said insulator (1) and electrically connected to the terminal of said upper terminal block (2).

7. A fuse as per claim 1, characterised by the fact that it also comprises a lower insulating cylinder (8), said lower insulating cylinder (8) being intended to house said arc-extinguishing tube (6) and being clearance-fitted to said arc-extinguishing tube (6).

8. A fuse as per claim 7, characterized by further comprising a lower insulating cylinder holder mounted at the bottom of the lower insulating cylinder (8) to support the lower insulating cylinder (8).

9. A fuse as per claim 1, characterised in that said lower static contact (5) comprises a lower static contact fixing ring, electrically abutted against said lower static contact (5), said lower static contact fixing ring being provided with a threaded connection hole to which a terminal of said lower terminal block (3) is connected by means of a threaded fastener.

10. A fuse as per claim 9, characterised in that said lower static contact (5) comprises a catching disc (52), said catching disc (52) having a mounting notch to receive said terminal of said lower socket, said lower static contact fixing ring being mounted onto said catching disc (52) with said threaded connection hole being arranged in correspondence of said mounting notch (521).

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