CN107527777B - Fuse assembly - Google Patents
Fuse assembly Download PDFInfo
- Publication number
- CN107527777B CN107527777B CN201610458465.0A CN201610458465A CN107527777B CN 107527777 B CN107527777 B CN 107527777B CN 201610458465 A CN201610458465 A CN 201610458465A CN 107527777 B CN107527777 B CN 107527777B
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- Prior art keywords
- fuse
- finger
- assembly
- contact finger
- contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/143—Electrical contacts; Fastening fusible members to such contacts
- H01H85/15—Screw-in contacts
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Abstract
A fuse assembly, wherein the fuse assembly comprises a fuse well, a fuse, a contact finger assembly and a fuse end cover, wherein one end of the fuse well is connected with the fuse end cover, the fuse is accommodated in the fuse well, the contact finger assembly is used for holding a fuse end of the fuse, a contact finger external thread is arranged on the contact finger assembly, an end cover internal thread is arranged in an internal space of the fuse end cover, and the contact finger assembly is installed in the internal space of the fuse end cover through threaded matching between the contact finger external thread and the end cover internal thread.
Description
Technical Field
The present disclosure relates to a fuse assembly and, more particularly, to a fuse assembly that connects a finger assembly and a fuse end cap together by a threaded fit. The fuse assembly according to the present disclosure further includes an annular protective sheath.
Background
In the prior art, screw fasteners are required to mount the finger assembly in the fuse end cap. The method is that a threaded hole is arranged in the fuse end cover, and a screw with a certain length is screwed into the threaded hole through a through hole arranged at the bottom of the contact finger assembly, so that the contact finger assembly is installed in the fuse end cover. Due to the need to provide threaded holes in the fuse end cap, the fuse end cap is relatively large in size. In addition, the head of the screw occupies the inner space of the finger assembly, so that the end of the fuse and the finger assembly do not have sufficient contact area, and the junction depth is insufficient, and the contact is poor, that is, the finger assembly cannot stably hold the fuse. In addition, since the fuse finger is made of a single thickness of a metal material, the temperature of the contact portion between the end of the fuse and the finger assembly rises too fast.
The combination of the finger assembly and the fuse end cap needs to be accommodated in a gas box filled with insulating gas, and since the size of the fuse end cap is relatively large, the size of the gas box is difficult to be further reduced.
Disclosure of Invention
In order to solve the above-mentioned drawbacks of the prior art, a first aspect of the present disclosure provides a fuse assembly, wherein the fuse assembly includes a fuse well, a fuse, a contact finger assembly and a fuse end cover, one end of the fuse well is connected to the fuse end cover, the fuse is accommodated in the fuse well, the contact finger assembly is used for holding a fuse end of the fuse, a contact finger external thread is disposed on the contact finger assembly, an end cover internal thread is disposed in an internal space of the fuse end cover, and the contact finger assembly is installed in the internal space of the fuse end cover through a threaded fit between the contact finger external thread and the end cover internal thread.
The contact finger assembly comprises a fuse contact finger, and the fuse contact finger is provided with the contact finger external thread.
The contact finger assembly comprises a contact finger nut, and the contact finger nut is provided with the contact finger external thread.
The contact finger nut is annular, the contact finger external thread is arranged on the outer circumferential surface of the contact finger nut, and the contact finger nut is installed in the inner space of the fuse wire end cover through the thread fit between the contact finger external thread and the end cover internal thread.
The contact finger assembly further comprises a fuse contact finger, the fuse contact finger comprises a circular fuse contact finger base and a plurality of contact finger branches, and the contact finger nut is sleeved on the plurality of contact finger branches from the fuse contact finger base.
The plurality of finger branches extend axially from a circumferential edge of the fuse finger base along an axis of the finger assembly and extend in a radially inward direction such that the plurality of finger branches form an included angle with the fuse finger base, each of the plurality of finger branches being resilient.
The fuse contact finger further includes a contact finger positioning portion formed on a circumferential edge of the fuse contact finger base portion, the contact finger positioning portion cooperating with a nut positioning portion formed on an inner circumferential surface of the contact finger nut, thereby restricting relative rotation between the fuse contact finger and the contact finger nut when the fuse contact finger is assembled with the contact finger nut.
The finger positioning portion is a protruding piece, the nut positioning portion is a groove, and the protruding piece can be fitted in the groove.
An end of each of the plurality of finger branches is bent radially outward, and the bent slope facilitates insertion of a fuse end of a fuse into the fuse finger.
The fuse contact finger is made of a conductive metal material, the fuse contact fingers made of materials with different thicknesses are selected according to the requirements of application occasions, such as copper, and the fuse contact finger with the larger thickness has better heat dissipation performance.
The finger assembly further includes a ring spring disposed around the plurality of finger branches such that the ring spring presses the plurality of finger branches against an outer surface of the fuse end of the fuse when the fuse end of the fuse is inserted into the fuse finger.
The finger assembly further includes an expansion collar disposed at a junction of the fuse finger base and the plurality of finger branches.
The nut positioning portion provided on the inner circumferential surface of the finger nut is used to press the expansion collar against the fuse finger base and is engageable with an installation tool.
The fuse contact finger base is provided with an opening.
In accordance with a second aspect of the present disclosure, the fuse assembly further includes an annular protective sheath having a conductive semiconductive coating disposed on an inner circumferential surface thereof and a slot opening to an exterior of the annular protective sheath.
The fuse assembly further comprises a conductive ring, and the other end of the fuse well is connected with one end of the conductive ring.
The annular protective sleeve is sleeved on the other end of the conductive ring, the slot faces to the outer surface of the conductive ring, and the conductive semiconductor coating is in contact with the outer surface of the conductive ring.
The conductive ring is in communication with a fuse loop (not shown) and is not in direct contact with the fuse, wherein discharge of the fuse is directed to the fuse loop via the conductive ring.
The annular protective sleeve is made of silicon rubber.
The fuse assembly is disposed in the gas box.
A safety gap is kept between the fuse wire end cover of the fuse wire assembly and the gas box, and insulating gas is filled in the safety gap.
Experiment surface, because the existence of the annular protective sheath that has electrically conductive semiconductor coating, the electric field erosion to the conducting ring has been alleviated. In addition, due to the existence of the slot on the annular protective sleeve, which leads to the outside of the annular protective sleeve, the pressure balance between the inside and the outside of the annular protective sleeve is favorably maintained when the insulating gas is filled and pumped, so that the deformation of the annular protective sleeve is reduced, and the stable connection between the annular protective sleeve and the conducting ring is further maintained.
The method based on the structure is that a contact finger external thread is arranged on a contact finger assembly, an end cover internal thread is arranged in the internal space of the fuse wire end cover, and the contact finger assembly is arranged in the internal space of the fuse wire end cover through the thread matching between the contact finger external thread and the end cover internal thread.
The construction according to the present disclosure does not require the use of threaded holes and the size of the fuse end cap required is reduced, and therefore the size of the air box is further reduced. Since no screw is required, the head of the screw does not occupy the inner space of the finger assembly, which ensures a sufficient contact area between the end of the fuse and the finger assembly, thereby increasing the coupling depth, i.e., the finger assembly stably holds the fuse.
In addition, since the effective contact area of the base portion of the fuse finger is increased to improve the efficiency of conducting heat and current, the heat dissipation performance of the finger branch portion is improved, so that the temperature rise of the contact portion between the end portion of the fuse and the finger branch becomes slow.
So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. There are, of course, embodiments of the invention that will be described below and which will form the subject matter of the claims appended hereto.
As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the appended claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
Drawings
The present invention will be better understood and its advantages will become more apparent to those skilled in the art from the following drawings. The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations and are not intended to limit the scope of the present disclosure.
FIG. 1 illustrates an exploded view with a fuse assembly according to the present disclosure;
FIG. 2 illustrates an assembly view of a stylus assembly according to the present disclosure;
FIG. 3 is a half sectional view showing a fuse end cap and a finger assembly received therein according to the present disclosure;
FIG. 4 illustrates a reduction in size of a fuse end cap and a corresponding reduction in size of an air box;
FIG. 5 illustrates a fuse finger according to the present disclosure;
FIG. 6 illustrates a stylus nut according to the present disclosure;
FIG. 7 illustrates an annular spring according to the present disclosure;
figure 8 illustrates an expansion hoop according to the present disclosure;
FIG. 9 illustrates the fuse assembly further including a fuse well, a conductive ring, and an annular protective sheath according to the present disclosure;
FIG. 10 shows a form sleeve according to the present disclosure;
FIG. 11 illustrates a fuse according to the present disclosure.
Detailed Description
Embodiments of the present disclosure are described in detail below with reference to the above-described drawings.
Fig. 1 shows an exploded view with a fuse assembly according to the present disclosure, wherein a finger assembly 1, a fuse end cap 2 and a fuse well 3 are shown, the finger assembly 1 being mounted in the fuse end cap 2, the fuse well 3 being connected to the fuse end cap 2, the finger assembly 1 being for holding a fuse end 4-1 of a fuse 4, a fuse body 4-2 of the fuse 4 being received in the fuse well 3. Specifically, a contact finger external thread is provided on the contact finger assembly 1, an end cover internal thread 2-1 (see fig. 3) is provided in the internal space of the fuse end cover 2, and the contact finger assembly 1 is installed in the internal space of the fuse end cover 2 by the thread fit between the contact finger external thread and the end cover internal thread.
Fig. 2 shows an assembly view of a finger assembly 1 according to the present disclosure, the finger assembly 1 comprising a fuse finger 5 (also shown in fig. 5). According to one embodiment, the fuse contact finger 5 is provided with the external contact finger thread (not shown in the figures) on its peripheral surface. In this embodiment, the fuse contact finger 5 may be directly screwed to the internal end cap thread provided in the internal space of the fuse end cap 2, thereby being fixed therein.
According to another embodiment, as also shown in fig. 2, the finger assembly 1 includes a finger nut 6, and the finger nut 6 is provided with the finger external thread 6-1.
In fig. 2, the contact finger nut 6 is in a ring shape, the contact finger external thread 6-1 is arranged on the outer circumferential surface of the contact finger nut 6, and the contact finger nut is installed in the inner space of the fuse end cover through the thread fit between the contact finger external thread 6-1 and the end cover internal thread.
As shown in fig. 2 and 5, the fuse contact finger 5 includes a fuse contact finger base 5-1 having a circular shape and a plurality of contact finger branches 5-2, and the contact finger nut 6 is fitted over the plurality of contact finger branches 5-2 from the fuse contact finger base 5-1.
The plurality of finger branches 5-2 extend axially along an axis a (see fig. 5) of the finger assembly from a circumferential edge of the fuse finger base 5-1 and extend in a radially inward direction such that the plurality of finger branches form an included angle with the fuse finger base, each of the plurality of finger branches 5-2 being resilient.
The fuse finger 5 further includes a finger positioning portion 5-3 formed on a circumferential edge of the fuse finger base portion 5-1, the finger positioning portion 5-3 cooperating with a nut positioning portion 6-2 formed on an inner circumferential surface of the finger nut 6, thereby restricting relative rotation between the fuse finger 5 and the finger nut 6 when the fuse finger 5 is assembled with the finger nut 6.
As shown in fig. 5, the finger positioning portion 5-3 is a tab. As shown in fig. 6, the nut positioning portion 6-2 is a groove in which the tab can be fitted.
The end of each of the plurality of finger branches 5-2 is bent radially outward, and the bent slope facilitates insertion of the fuse end 4-1 (see fig. 11) of the fuse 4 into the finger positioning portion 5-3 of the fuse finger 5.
The fuse finger 5 is made of a conductive metal material, and the effective contact area of the fuse finger base 5-1 is increased to improve the efficiency of conducting heat and current, so that the heat dissipation performance of the finger branch 5-2 is improved, thereby slowing down the temperature rise of the contact portion between the fuse end 4-1 of the fuse 4 and the finger branch 5-2 while reducing the temperature.
According to yet another embodiment, as shown in fig. 2 and 7, the finger assembly 1 further comprises a ring spring 7, the ring spring 7 being arranged to surround the plurality of finger branches 5-2, such that the ring spring 7 presses the plurality of finger branches 5-2 against the outer surface of the fuse end 4-1 of the fuse 4 when the fuse end of the fuse is inserted in the fuse finger.
As shown in fig. 2 and 8, according to yet another embodiment, the finger assembly 1 further comprises an expansion collar 8, the expansion collar 8 being disposed at the junction of the fuse finger base 5-1 and the plurality of finger branches 5-2.
The nut positioning portion 6-2 provided on the inner circumferential surface of the finger nut 6 also serves to press the expansion collar 8 against the fuse finger base 5-1 and to be able to be engaged with an installation tool.
An opening 5-1-1 is formed in the fuse finger base 5-1.
Figure 9 shows that the fuse assembly according to the present disclosure further comprises a fuse well 3, a conductive ring 10 and an annular protective sheath 9.
Figure 10 shows a protective annular sheath according to the present disclosure, wherein the annular sheath 9 is provided with a conductive semiconductor coating 9-1 on its inner circumferential surface and with a slot 9-2 leading to the outside of the annular sheath 9.
One end of the fuse well 3 is connected with the fuse end cover 2, and the other end of the fuse well 3 is connected with one end of the conductive ring 10; the annular protective sheath 9 is sleeved on the other end of the conductive ring 10, the slot 9-2 faces the outer surface of the conductive ring 10, and the conductive semiconductor coating 9-1 contacts the outer surface of the conductive ring 10. The conductive loop 10 is conductive with a fuse loop (not shown) and is not in direct contact with the fuse 4, wherein the discharge of the fuse 4 leads to the fuse loop via the conductive loop 10.
The annular protective sleeve 9 is made of silicone rubber.
Experiment surface, because the existence of the annular protective sheath that has electrically conductive semiconductor coating, the electric field erosion to the conducting ring has been alleviated. In addition, due to the existence of the slot on the annular protective sleeve, which leads to the outside of the annular protective sleeve, the pressure balance between the inside and the outside of the annular protective sleeve is favorably maintained when the insulating gas is filled and pumped, so that the deformation of the annular protective sleeve is reduced, and the stable connection between the annular protective sleeve and the conducting ring is further maintained.
Figure 4 shows a reduction in the size of the fuse end cap and a corresponding reduction in the size of the air box 11. The fuse assembly is disposed in the air box 11, wherein the upper part of fig. 4 shows the positional relationship between the air box using screws and the fuse end cap 2 in the prior art, and the lower part of fig. 4 shows the positional relationship between the air box 11 and the fuse end cap 2 without using screws in the present disclosure. It can be seen that the dimensions of the fuse end cap 2 in the upper part of fig. 4 are significantly larger than the dimensions of the fuse end cap 2 in the lower part of fig. 4.
In fig. 4, a safety gap is maintained between the fuse end cap 2 of the fuse assembly and the gas box 11, and an insulating gas is filled in the safety gap.
This structure according to the present disclosure requires a reduction in the size of the fuse end cap required since neither threaded holes provided in the fuse end cap 2 nor screw fasteners are required, and therefore the size of the air box is also reduced accordingly, for example the size of the air box 11 in the lower part of fig. 4 can be reduced to the right compared to the size of the air box 11 in the upper part of fig. 4.
While the invention has been described in the specification and drawings with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention as defined in the claims. Moreover, the combination and arrangement of features, elements and/or functions between specific embodiments herein is clearly apparent and thus, in light of this disclosure, one skilled in the art will appreciate that features, elements and/or functions of an embodiment may be incorporated into another specific embodiment as appropriate, unless described otherwise, above. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the foregoing description and the appended claims.
Claims (17)
1. A fuse assembly, wherein the fuse assembly comprises a fuse well, a fuse, a contact finger assembly and a fuse end cover, wherein one end of the fuse well is connected with the fuse end cover, the fuse is accommodated in the fuse well, the contact finger assembly is used for holding a fuse end of the fuse, a contact finger external thread is arranged on the contact finger assembly, an end cover internal thread is arranged in an internal space of the fuse end cover, and the contact finger assembly is installed in the internal space of the fuse end cover through threaded matching between the contact finger external thread and the end cover internal thread;
the contact finger assembly comprises a fuse contact finger, and the fuse contact finger is provided with the contact finger external thread.
2. The fuse assembly of claim 1, wherein:
the contact finger assembly comprises a contact finger nut, and the contact finger nut is provided with the contact finger external thread.
3. The fuse assembly of claim 2, wherein:
the contact finger nut is annular, the contact finger external thread is arranged on the outer circumferential surface of the contact finger nut, and the contact finger nut is installed in the inner space of the fuse wire end cover through the thread fit between the contact finger external thread and the end cover internal thread.
4. The fuse assembly of claim 3, wherein:
the contact finger assembly further comprises a fuse contact finger, the fuse contact finger comprises a circular fuse contact finger base and a plurality of contact finger branches, and the contact finger nut is sleeved on the plurality of contact finger branches from the fuse contact finger base.
5. The fuse assembly of claim 4, wherein:
the plurality of finger branches extend axially from a circumferential edge of the fuse finger base along an axis of the finger assembly and extend in a radially inward direction such that the plurality of finger branches form an included angle with the fuse finger base, each of the plurality of finger branches being resilient.
6. The fuse assembly of claim 4, wherein:
the fuse contact finger further includes a contact finger positioning portion formed on a circumferential edge of the fuse contact finger base portion, the contact finger positioning portion cooperating with a nut positioning portion formed on an inner circumferential surface of the contact finger nut, thereby restricting relative rotation between the fuse contact finger and the contact finger nut when the fuse contact finger is assembled with the contact finger nut.
7. The fuse assembly of claim 6, wherein:
the finger positioning portion is a protruding piece, the nut positioning portion is a groove, and the protruding piece can be fitted in the groove.
8. The fuse assembly of claim 5, wherein:
an end of each of the plurality of finger branches is bent radially outward, and the bent slope facilitates insertion of a fuse end of a fuse into the fuse finger.
9. The fuse assembly of claim 4, wherein:
the fuse wire contact finger is made of conductive metal materials, and the fuse wire contact fingers made of materials with different thicknesses are selected and installed according to the requirements of application occasions.
10. The fuse assembly of claim 4, wherein:
the finger assembly further includes a ring spring disposed around the plurality of finger branches such that the ring spring presses the plurality of finger branches against an outer surface of the fuse end of the fuse when the fuse end of the fuse is inserted into the fuse finger.
11. The fuse assembly of claim 4, wherein:
the finger assembly further includes an expansion collar disposed at a junction of the fuse finger base and the plurality of finger branches.
12. The fuse assembly of claim 6, wherein:
the nut positioning portion provided on the inner circumferential surface of the finger nut is used to press the expansion hoop of the finger assembly against the fuse finger base and is capable of being engaged with an installation tool.
13. The fuse assembly of claim 4, wherein:
the fuse contact finger base is provided with an opening.
14. The fuse assembly of claim 1, wherein:
the fuse assembly further includes an annular protective sheath having a conductive semiconductive coating disposed on an inner circumferential surface thereof and a slot opening to an exterior of the annular protective sheath.
15. The fuse assembly of claim 14, wherein:
the fuse assembly further comprises a conductive ring, and the other end of the fuse well is connected with one end of the conductive ring;
the annular protective sleeve is sleeved on the other end of the conductive ring, the slot faces to the outer surface of the conductive ring, and the conductive semiconductor coating is in contact with the outer surface of the conductive ring.
16. The fuse assembly of claim 14, wherein:
the annular protective sleeve is made of silicon rubber.
17. The fuse assembly of one of claims 1 to 16, wherein:
the fuse assembly is disposed in a gas box;
a safety gap is kept between the fuse wire end cover of the fuse wire assembly and the gas box, and insulating gas is filled in the safety gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610458465.0A CN107527777B (en) | 2016-06-22 | 2016-06-22 | Fuse assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610458465.0A CN107527777B (en) | 2016-06-22 | 2016-06-22 | Fuse assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107527777A CN107527777A (en) | 2017-12-29 |
| CN107527777B true CN107527777B (en) | 2020-05-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610458465.0A Active CN107527777B (en) | 2016-06-22 | 2016-06-22 | Fuse assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107527777B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108648950A (en) * | 2018-04-03 | 2018-10-12 | 泸州诚远投资管理有限公司 | A kind of connection electric conductor of high-tension fuse |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191017047A (en) * | 1908-06-23 | 1910-11-10 | Siemens Schuckertwerke Gmbh | Improvements in or relating to Electric Fuses. |
| GB487424A (en) * | 1937-01-26 | 1938-06-21 | Crabtree & Co Ltd J A | Improvements in or relating to, electrical fuses of the rewirable type |
| US4059816A (en) * | 1975-11-20 | 1977-11-22 | Mcgraw-Edison Company | Electrical loadbreak fuse and canister assembly |
| DE19831376B4 (en) * | 1998-07-13 | 2005-06-09 | M. Schneider Gmbh - Annaberg | Switching status indicator for fuse links |
| CN200969312Y (en) * | 2006-09-28 | 2007-10-31 | 厦门市恒源新电力设备有限公司 | Combined electrical equipment of high-voltage vacuum switch with fuse |
| CN202871733U (en) * | 2012-10-30 | 2013-04-10 | 中国西电集团公司 | Contact pawl connection device for fuse |
| CN204349231U (en) * | 2014-10-31 | 2015-05-20 | 许继集团有限公司 | A kind of fuse unit and use the switch cubicle of this fuse unit |
| CN204809177U (en) * | 2014-11-07 | 2015-11-25 | 施耐德电器工业公司 | Contact spring and self -adaptation type fuse holder structure |
-
2016
- 2016-06-22 CN CN201610458465.0A patent/CN107527777B/en active Active
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| Publication number | Publication date |
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| CN107527777A (en) | 2017-12-29 |
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