CN209515351U - A kind of metal tube resistor extending creepage distance - Google Patents

Abstract

A kind of metal tube resistor of the extension creepage distance of the utility model, including metal tube and the resistance wire being threaded through in metal tube, the both ends of metal tube are equipped with metal bar, the inner end of metal bar is inserted into metal tube and connect with the resistance wire, and the outer end of metal bar, which extends to outside metal tube, is used as exit；Metal oxide filler is filled in metal tube；Insulating part is injection molded between metal bar on the inside of the both ends of metal tube, insulating part seals up the port of metal tube and coats the lateral surface for extending metal tube of metal bar, and the lateral surface of insulating part is wavy shaped configuration.Due to the lateral surface for extending metal tube of insulating part cladding metal bar, the lateral surface of insulating part is wavy shaped configuration, therefore the power path of climbing between metal tube and metal bar can be by the wavy shaped configuration of insulating part lateral surface, form tortuous extended creepage distance, therefore short circuit between metal tube and metal bar can be prevented, the use demand of high-tension high-power is met.

Description

A kind of metal tube resistor extending creepage distance

Technical field

The utility model relates to resistor technologies fields, and in particular to a kind of metal tube resistor for extending creepage distance.

Background technique

Existing metal tube resistor, the resistance wire that structure generally comprises metal tube and is threaded through in metal tube, metal The both ends of pipe are inserted with metal bar, and resistance wire both ends are connected with the metal bar at metal tube both ends respectively, in metal tube Metal oxide filler is equipped between internal resistance wire and metal tube, inserted with insulation between the both ends and metal bar of metal tube Part.Although however there is insulating part to be separated by between metal tube and metal bar, since the length of the stretching metal tube of metal bar cannot mistake It is long, cause the creepage distance between metal bar and metal tube shorter, easily causes short circuit when high-tension high-power, exist Security risk.

Summary of the invention

For the prior art there are above-mentioned technical problem, the utility model provides a kind of metal tube electricity for extending creepage distance Device is hindered, short circuit can be prevented, meet the use demand of high-tension high-power.

To achieve the above object, the utility model the following technical schemes are provided:

A kind of metal tube resistor for extending creepage distance is provided, including metal tube and the resistance being threaded through in metal tube Silk, the both ends of metal tube are equipped with metal bar, and the inner end of metal bar is inserted into metal tube and connect with the resistance wire, The outer end of metal bar, which extends to outside metal tube, is used as exit；Between inner wall of metal tube and metal bar outer wall, in metal tube Metal oxide filler is filled between wall and resistance wire；The injection molding between metal bar on the inside of the both ends of metal tube There is insulating part, insulating part seals up the port of metal tube and coats the lateral surface for extending metal tube of metal bar, insulating part Lateral surface is wavy shaped configuration.

Wherein, the insulating part is bakelite.

Wherein, the resistance wire is screw type.

Wherein, the metal oxide filler is magnesia powder filler.

Wherein, the end of the resistance wire is fastened on the end of the metal bar.

Wherein, the outside riveting of the metal tube forms fixinig plate.

The utility model has the beneficial effects that

The metal tube resistor of a kind of extension creepage distance of the utility model, compared with prior art, due to insulating part Coat the lateral surface for extending metal tube of metal bar, the lateral surface of insulating part is wavy shaped configuration, therefore metal tube and metal Climbing power path and can pass through the wavy shaped configuration of insulating part lateral surface between stick, forms tortuous extended creepage distance, therefore energy Short circuit between metal tube and metal bar is enough prevented, the use demand of high-tension high-power is met.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of the metal tube resistor of extension creepage distance of the utility model.

Fig. 2 is the enlarged view in Fig. 1 at A.

Appended drawing reference:

Metal tube 1；

Resistance wire 2；

Metal bar 3；

Metal oxide filler 4；

Bakelite 5, wavy shaped configuration 51；

Fixinig plate 6；

Locking member 7.

Specific embodiment

The utility model is described in detail below in conjunction with specific embodiments and drawings.

A kind of metal tube resistor of the extension creepage distance of the present embodiment, as depicted in figs. 1 and 2, including 1 He of metal tube The resistance wire 2 being threaded through in metal tube 1, resistance wire 2 are in spring like, are screw types.Metal tube 1 is seamless steel pipe.Metal tube 1 Both ends be equipped with metal bar 3, the inner end of metal bar 3 is inserted into metal tube 1 and connect with resistance wire 2, metal bar 3 Outer end is extended to as exit outside metal tube 1, between 3 outer wall of 1 inner wall of metal tube and metal bar, 1 inner wall of metal tube with Nonconducting metal oxide filler 4 is filled between resistance wire 2, metal oxide filler 4 is preferably magnesia powder filler, Metal oxide filler 4 plays certain fixed function to metal bar 3.On the inside of the both ends of metal tube 1 between metal bar 3 It is injection molded with bakelite 5, bakelite 5 seals up the port of metal tube 1 as insulating part, and coat metal bar 3 extends metal The lateral surface of pipe 1.The outside riveting of metal tube 1 forms fixinig plate 6.

In the present embodiment, since bakelite 5, bakelite are injection molded between metal bar 3 on the inside of the both ends of metal tube 1 5 seal up the port of metal tube 1, and coat the lateral surface for extending metal tube 1 of metal bar 3.The chemical name of bakelite 5 is phenol Aldehyde plastics do not absorb water non-conductive, have good insulating properties.Furthermore bakelite 5 is molded in metal tube 1, compared to tradition The direct-insert mode of insulating part finished product, the mode sealing performance of injection molding is more preferable.And bakelite 5 has good resistance to Hot corrosion resistance can satisfy the requirement that resistor uses under rugged environment.

In the present embodiment, since bakelite 5 coats the lateral surface for extending metal tube 1 of metal bar 3, the lateral surface of bakelite 5 Power path of climbing for wavy shaped configuration 51, therefore between metal tube 1 and metal bar 3 can be by the waveform of the lateral surface of bakelite 5 Structure 51 forms tortuous extended creepage distance, therefore can prevent short circuit between metal tube 1 and metal bar 3, meets high voltage Powerful use demand.

In the present embodiment, the end of resistance wire 2 is fastened on the end of metal bar 3, can be in order to preferably wind Annular groove is provided on the outside of the end of metal bar 3, the end of resistance wire 2 is wrapped in annular groove, is twined for resistance wire 2 It is stronger around obtaining, it is simpler by the way of winding compared to the mode that traditional resistor silk 2 is welded on metal bar 3, reduce processing Difficulty and cost.

In the present embodiment, the outside of metal bar 3 is fixed with the locking member 7 of tubular, and the outside of locking member 7 (is pasted with bakelite 5 The side of conjunction) it is provided with annular knurl convex-concave slot (not shown), the inside of bakelite 5 is embedded in the annular knurl convex-concave slot.Annular knurl convex-concave The lines of slot can be along its own length direction, be also possible to circumferential around itself, be also possible to staggeredly knurling.By It is fixed with locking member 7 in the outside of metal bar 3, the outside of locking member 7 is provided with annular knurl convex-concave slot, therefore 7 pairs of locking member insulation Part applies coupling mechanism force, prevents insulating part to be displaced outwardly or rotate, stable structure meets the requirement of severe use environment.

When processing, first the both ends of resistance wire 2 are wrapped on metal bar 3, are put into metal tube 1, are filled in metal tube 1 Magnesium oxide powder can play the role of fixed resistance silk 2 and fixed metal bar 3 by being repeatedly compacted magnesium oxide powder.Then It is inserted in locking member 7 far from the end of resistance wire 2 in metal bar 3, it, can be with about the fixed form between locking member 7 and metal bar 3 The inner hole for being locking member 7 is taper, is inserted in after metal bar 3 and gradually tightens until fixation, is also possible to locking member 7 and metal bar It is screwed between 3.After fixing locking member 7, then integral molded plastic bakelite 5, last riveting form fixinig plate 6, electricity can be completed Resistance device integrally manufactures.

Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than to this reality With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is general Lead to it will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this The spirit and scope of utility model technical solution.

Claims (6)

1. a kind of metal tube resistor for extending creepage distance, it is characterized in that: including metal tube and the electricity being threaded through in metal tube Silk is hindered, the both ends of metal tube are equipped with metal bar, and the inner end of metal bar is inserted into metal tube and connects with the resistance wire It connects, the outer end of metal bar, which extends to outside metal tube, is used as exit；Between inner wall of metal tube and metal bar outer wall, metal tube Metal oxide filler is filled between inner wall and resistance wire；It is molded between metal bar on the inside of the both ends of metal tube Type has insulating part, and insulating part seals up the port of metal tube, and coats the lateral surface for extending metal tube of metal bar, insulating part Lateral surface be wavy shaped configuration；The locking member of tubular is fixed on the outside of metal bar, it is convex to be provided with annular knurl on the outside of locking member The inside of groove, insulating part is embedded in the annular knurl convex-concave slot.

2. a kind of metal tube resistor for extending creepage distance according to claim 1, it is characterized in that: the insulating part is Bakelite.

3. a kind of metal tube resistor for extending creepage distance according to claim 1, it is characterized in that: the resistance wire is Screw type.

4. a kind of metal tube resistor for extending creepage distance according to claim 1, it is characterized in that: the metal aoxidizes Object filler is magnesia powder filler.

5. a kind of metal tube resistor for extending creepage distance according to claim 1, it is characterized in that: the resistance wire End is fastened on the end of the metal bar.

6. a kind of metal tube resistor for extending creepage distance according to claim 1, it is characterized in that: the metal tube Outside riveting forms fixinig plate.