CN209859896U - Composite insulating pull rod for direct current breaker - Google Patents
Composite insulating pull rod for direct current breaker Download PDFInfo
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- CN209859896U CN209859896U CN201921150266.9U CN201921150266U CN209859896U CN 209859896 U CN209859896 U CN 209859896U CN 201921150266 U CN201921150266 U CN 201921150266U CN 209859896 U CN209859896 U CN 209859896U
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- direct current
- metal joint
- pull rod
- rod
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Abstract
The utility model relates to a compound insulation pull rod for direct current circuit breaker, install including main insulator spindle and through the screw thread the metal joint at main insulator spindle both ends, and the cover is in the insulation support in the metal joint outside, insulation support's inner end is provided with the orientation the step of main insulator spindle outer wall direction, the step parcel is lived the inner end of metal joint. The utility model discloses form seamless concatenation insulating layer with main insulator spindle and insulation support, avoided the metal joint lateral surface and the contact of outside air, form the structure of side all insulation, be favorable to the improvement of whole direct current circuit breaker subassembly's insulating properties, be convenient for reduce its occupation space.
Description
Technical Field
The utility model belongs to the technical field of insulating pull rod, concretely relates to compound insulation pull rod for direct current circuit breaker.
Background
One of the key points in the development of the dc circuit breaker is the series connection technology of multiple power electronic switching devices, and a reliable valve set structural member is required to withstand the transient overvoltage condition when the large current is turned off. The insulating pull rod is a key ring in a valve group structural member, is a core component for constructing direct current transmission equipment, and is required to have long-term overvoltage resistance and high mechanical strength reliability.
At present, an insulating pull rod is limited by an installation mode and tensile strength, metal fixing parts are exposed, the creepage distance is limited, and the problem of poor insulating property such as insufficient insulating gaps and the like is caused between the insulating pull rod and other surrounding parts frequently due to the influence of space in a circuit breaker valve group.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compound insulation pull rod for direct current circuit breaker to solve its insulating properties poor problem.
The utility model discloses a compound insulation pull rod for direct current circuit breaker is realized like this:
the utility model provides a compound insulation pull rod for direct current circuit breaker, includes main insulator spindle and installs through the screw thread the metal joint at main insulator spindle both ends, and the cover is in the insulation support in the metal joint outside, insulation support's inner end is provided with the orientation the step of main insulator spindle outer wall direction, the step parcel is lived the inner end of metal joint.
Furthermore, the outer end of the metal joint is provided with an exposed part exposed outside the insulating sleeve.
Further, the exposed part has an axial length of 0.3 to 1 mm.
Furthermore, the metal joint comprises an inner connecting end and an outer connecting end, inner threads are arranged on the inner wall of the inner connecting end, outer threads are arranged on the annular surfaces of the two ends of the main insulating rod, and the metal joint is connected with the main insulating rod through the matching of the inner threads and the outer threads.
Furthermore, filling grooves are formed in two ends of the internal thread, and epoxy adhesive is filled in the filling grooves.
Furthermore, silica gel is filled between the inner ring of the step and the annular outer wall of the main insulating rod.
Furthermore, the insulating sleeve is sleeved on the outer side of the metal joint through an epoxy adhesive.
Furthermore, the outer surface of the main insulating rod is sprayed with polyester insulating paint.
Furthermore, the main insulating rod and the insulating sleeve are made of vacuum glue dipping rods.
Furthermore, the metal joint is made of 45 steel with the hardness of HRC 28-32.
After the technical scheme is adopted, the utility model discloses the beneficial effect who has does:
(1) the insulating sleeve is sleeved outside the metal joint, so that the external creepage distance of the whole composite insulating pull rod can be increased under the condition of not increasing the length of the main insulating rod, and the insulating matching when the composite insulating pull rod is matched with other parts for use is improved;
(2) the utility model discloses because utilize insulation support's step to wrap up metal joint's inner end, avoided metal joint lateral surface and outside air contact, formed the structure of side full insulation, be favorable to the improvement of whole direct current circuit breaker subassembly's insulating properties, be convenient for reduce its occupation space.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a structural view of a composite insulating tie bar for a dc circuit breaker according to a preferred embodiment of the present invention;
fig. 2 is a front view of the composite insulating tie bar for the dc circuit breaker according to the preferred embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is an enlarged view of portion B of FIG. 3;
FIG. 5 is an enlarged view of portion C of FIG. 3;
fig. 6 is an axial sectional view of the main insulating rod of the composite insulating tie rod for the dc circuit breaker according to the preferred embodiment of the present invention;
fig. 7 is an axial sectional view of a metal joint of a composite insulating tie rod for a dc circuit breaker according to a preferred embodiment of the present invention;
in the figure: the insulation structure comprises a main insulation rod 1, external threads 11, a metal joint 2, an internal connection end 21, an external connection end 22, internal threads 23, a filling groove 24, an insulation sleeve 3, a step 4, an exposed part 5, epoxy adhesive 6 and silica gel 7.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1 to 7, the composite insulating pull rod for the dc circuit breaker includes a main insulating rod 1, metal connectors 2 installed at two ends of the main insulating rod 1 through threads, and an insulating sleeve 3 sleeved outside the metal connectors 2, wherein a step 4 facing the outer wall direction of the main insulating rod 1 is arranged at the inner end of the insulating sleeve 3, and the step 4 wraps the inner end of the metal connector 2.
When the composite insulating pull rod is connected with other parts in the direct current circuit breaker, the composite insulating pull rod is connected by the metal joint 2, if the outer end of the insulating sleeve 3 is flush with the outer end of the metal joint 2, the composite insulating pull rod can bear tensile force to cause the deformation of the insulating sleeve 3 and even be stripped from the metal joint 2, and in order to prevent the occurrence of the condition, the outer end of the metal joint 2 is provided with an exposed part 5 exposed outside the insulating sleeve 3.
The exposed part 5 can avoid the stress deformation of the insulating sleeve when the composite insulating pull rod bears the force, thereby ensuring the connection firmness of the insulating sleeve 3 and the metal joint 2 and the insulating property of the composite insulating pull rod.
In order to prevent the insulating sleeve 3 from deforming and falling off and ensure that the metal joint 2 is not contacted with the outside air, the axial length of the exposed part 5 is 0.3-1 mm.
Preferably, the exposed portion 5 has an axial length of 0.5 mm.
The metal joint 2 is arranged to connect the whole composite insulating pull rod to the dc circuit breaker assembly, the length of the insulating pull rod can be adjusted according to the environment to which the insulating pull rod is applied, in order to increase the application range of the insulating pull rod provided by the embodiment, the metal joint 2 comprises an inner connecting end 21 and an outer connecting end 22, an inner thread 23 is arranged on the inner wall of the inner connecting end 21, an outer thread 11 is arranged on the annular surfaces of two ends of the main insulating rod 1, and the metal joint 2 is connected with the main insulating rod 1 through the matching of the inner thread 23 and the outer thread 11.
The metal joint 2 is connected with the main insulating rod 1 through threads, and the metal joint 2 can be connected with the main insulating rod 1 with different lengths to form insulating pull rods with different length specifications.
And filling grooves 24 are formed at two ends of the internal thread 23, and the filling grooves 24 are filled with epoxy adhesive 6. Partial discharge under the condition of direct current tolerance can be avoided.
In order to increase the sealing property of the connection between the insulating sleeve 3 and the insulating main rod 1, silica gel 7 is filled between the inner ring of the step 4 and the annular outer wall of the main insulating rod 1.
After the silica gel 7 is filled, the sealing performance of the connection between the metal joint 2 and the main insulating rod 1 can be improved, and the insulating performance is further improved.
In order to increase the firmness of the connection between the insulating sleeve 3 and the metal joint 2, the insulating sleeve 3 is sleeved outside the metal joint 2 through epoxy adhesive.
In order to increase the aesthetic appearance of the exterior of the main insulating rod 1, the outer surface of the main insulating rod 1 is sprayed with a polyester insulating varnish.
The main insulating rod 1 and the insulating sleeve 3 are made of vacuum glue dipping rods.
The main insulating rod 1 and the insulating sleeve 3 are made of the same material, so that a medium can be endured between the ends of the metal joint 2 under the condition that the insulating part is made of the same material, and the effect of full insulation of the side surface of the composite insulating pull rod is achieved.
Specifically, the main insulating rod 1 is formed by rolling glass fiber cloth coaxially into a columnar blank, filling epoxy resin glue in the columnar blank in vacuum, and curing the epoxy resin glue. The insulating sleeve 3 is made of the same material as the main insulating rod, is made into a vacuum rubber-impregnated tube and is machined.
Optionally, the insulating sleeve 3 may also be made of an epoxy glass spacing cloth laminated board, such as model epgc202 or epgc306, so as to reduce the cost of the insulating sleeve 3.
Joints of the conventional composite insulating pull rod are made of non-metal materials and have poor tensile strength, and in the embodiment, the metal joint 2 is made of 45 steel with the hardness of HRC 28-32.
The 45 steel is quenched and tempered to HRC28-32 to be made into the metal joint 2, and the metal joint has high tensile strength and long service life.
When the composite insulating pull rod is installed, firstly, the insulating sleeve 3 is sleeved outside the metal joint 2 through epoxy adhesive, then the filling groove 24, close to the outer connecting end, in the metal joint 2 is filled with the epoxy adhesive 6, the metal joint 2 is screwed at the end part of the main insulating rod 1 through the matching of the internal thread 23 and the external thread 11, then the other filling groove 24 of the metal joint 2 is filled with the epoxy adhesive 6, after the solidification of the epoxy adhesive is waited, silica gel 7 is filled between the step 4 of the insulating sleeve 3 and the main insulating rod 1, and sealing is carried out.
The utility model discloses in there have insulation support 3 at the outside parcel of metal joint 2 to through the insulating layer that forms seamless concatenation between step 4 and the main insulator spindle 1, thereby avoid 2 lateral surfaces of metal joint and outside air contact, lead to and influence whole insulation with the circuit breaker subassembly in the clearance between other spare parts less the utility model discloses a compound insulation pull rod for the direct current circuit breaker adopts the structure of side complete insulation, is favorable to improving the insulating properties of direct current circuit breaker subassembly, is convenient for reduce its occupation space.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The utility model provides a compound insulating pull rod for direct current circuit breaker, its characterized in that includes main insulator spindle (1) and installs through the screw thread metal joint (2) at main insulator spindle (1) both ends, and cover are in insulation support (3) in the metal joint (2) outside, the inner end of insulation support (3) is provided with the orientation step (4) of main insulator spindle (1) outer wall direction, step (4) parcel is lived the inner end of metal joint (2).
2. The composite insulating tie rod for a direct current circuit breaker according to claim 1, characterized in that the outer end of the metal joint (2) is provided with an exposed portion (5) exposed outside the insulating sleeve (3).
3. The composite insulating tie rod for a direct current breaker according to claim 2, characterized in that the axial length of the bare portion (5) is 0.3-1 mm.
4. The composite insulation pull rod for the direct current breaker according to claim 1, wherein the metal joint (2) comprises an inner connection end (21) and an outer connection end (22), an inner thread (23) is arranged on the inner wall of the inner connection end (21), an outer thread (11) is arranged on the annular surface of the two ends of the main insulation rod (1), and the metal joint (2) is connected with the main insulation rod (1) through the matching of the inner thread (23) and the outer thread (11).
5. The composite insulating pull rod for the direct current circuit breaker according to claim 4, wherein filling grooves (24) are formed at two ends of the internal thread (23), and the filling grooves (24) are filled with the epoxy adhesive (6).
6. The composite insulating pull rod for the direct current breaker according to claim 5, wherein a silica gel (7) is filled between the inner ring of the step (4) and the annular outer wall of the main insulating rod (1).
7. The composite insulating pull rod for the direct current circuit breaker is characterized in that the insulating sleeve (3) is sleeved on the outer side of the metal joint (2) through epoxy adhesive (6).
8. The composite insulating pull rod for the direct current breaker according to claim 1, characterized in that the outer surface of the main insulating rod (1) is coated with polyester insulating paint.
9. The composite insulating pull rod for the direct current circuit breaker according to claim 1, wherein the main insulating rod (1) and the insulating sleeve (3) are made of vacuum impregnated rubber bars.
10. The composite insulating pull rod for the direct current breaker according to claim 1, wherein the metal joint (2) is made of 45 steel with the hardness of HRC 28-32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921150266.9U CN209859896U (en) | 2019-07-19 | 2019-07-19 | Composite insulating pull rod for direct current breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921150266.9U CN209859896U (en) | 2019-07-19 | 2019-07-19 | Composite insulating pull rod for direct current breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209859896U true CN209859896U (en) | 2019-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921150266.9U Active CN209859896U (en) | 2019-07-19 | 2019-07-19 | Composite insulating pull rod for direct current breaker |
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| Country | Link |
|---|---|
| CN (1) | CN209859896U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110246730A (en) * | 2019-07-19 | 2019-09-17 | 常州博瑞电力自动化设备有限公司 | A kind of dc circuit breaker composite insulated pull-rod |
-
2019
- 2019-07-19 CN CN201921150266.9U patent/CN209859896U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110246730A (en) * | 2019-07-19 | 2019-09-17 | 常州博瑞电力自动化设备有限公司 | A kind of dc circuit breaker composite insulated pull-rod |
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