CN2376053Y - Composite casing metal oxide arrester - Google Patents

Abstract

The utility model relates to a compound outer sleeve metal oxide lightning arrester, which is a lightning arrester of a cage type core body integration structure with a base seat or a hanging type structure. The utility model is composed of an upper electrode, a spring, a soft rubber sheet, a valve sheet, an insulating pull rod, a compound outer sleeve, a pin, a base seat electrode, a base seat flange and a base seat sleeve barrel. The connection relationship is that the core body which is distributed at the circumference of the valve sheet by the insulating pull rod is connected with the upper electrode and the base seat electrode by the pull rod; the rubber sheet is loaded between the upper electrode, the spring and the valve sheet; the lower side of the base seat electrode can be orderly connected with the sleeve barrel and the flange. The utility model has the advantages of high mechanical intensity, reliable capability of pressure release, high safety, low cost and high reliability, and can not happen blast.

Description

Polymeric metal oxide surge arrester

The utility model is a polymeric metal oxide surge arrester, belongs to overvoltage protection.

Polymeric housed metal oxide arrester is existing at home and abroad to be produced, and their structure is different, but is mainly wound form chipware or tube-containing type chipware.The polymeric housed metal oxide arrester chipware then is that part of element that polymeric housed metal oxide arrester removes overcoat, and the performance of chipware has determined the mechanical strength properties of lightning arrester, pressure release performance and electric property.The wound form chipware be with the glass wool cloth of having smeared epoxy adhesive the valve block post multilayer of chipware wrap up, the mechanical strength of this chipware structure is lower, when lightning arrester is inner arc burning takes place particularly, when producing the gas expansion, owing to there is not the passage of release of gas pressure, the fragment of valve block flies out easily internally, poor stability, and the pressure releasability is relatively poor; The tube-containing type core body then be with the higher epoxy fibreglass cloth jacket casing of mechanical strength on the valve block post, two ends are with the electrode that is threaded, though this structure is improved the mechanical strength of chipware, the pressure releasability is still relatively poor, and the cost height.

The purpose of this utility model is exactly to have the polymeric housed metal oxide arrester internal structure now and be mainly wound form or tube-containing type and exist lower, the no gas pressure release channel of mechanical strength, pressure releasability poor in order to overcome and to solve, the valve block fragment easily flies out internally, poor stability, more high shortcoming and the problem of cost, a kind of mechanical strength height of research and design, have reliable releasability, comminuted blast can not take place, fail safe is good, lower-cost polymeric metal oxide surge arrester.

The utility model is realized by following structure technology scheme: the structural representation of polymeric metal oxide surge arrester as shown in Figure 1.It is cage core body band base integral structure or suspended structure lightning arrester, it is mainly by top electrode 1, spring 2, soft rubber sheet 3, valve block 4, insulated tension pole 5, composite sheath 6, pin 7,11, base electrode 8, base flange 9, base sleeve 10 connects and composes jointly, its mutual alignment and annexation are: core body is uniformly distributed in around the valve block 4 by the many higher insulated tension poles 5 of tensile strength, and by insulated tension pole 5 the Connect Power utmost point 1 and base electrode 8, the spring 2 that pressure is bigger is installed on top electrode, soft rubber sheet 3 is loaded between top electrode 1 and spring 2 and the valve block post 4, rubber-like composite sheath 6 directly is close to valve block post 4 sides and insulated tension pole 5 is coated, base electrode 8 is by pin 7 and insulated tension pole 5 lower end Joints, the upper end of insulated tension pole 5 constitutes (suspension type) composite sheath metal oxide by pin 11 and top electrode 1 Joint to be kept away and needs device, is connected mutually with base sleeve 10 and base flange 9 successively below the base electrode 8 again and constitutes the polymeric metal oxide surge arrester of a band base integral structure.Its critical piece action principle is: spring 2 can guarantee that valve block is electrically connected reliably, considers that simultaneously polymeric housed metal oxide arrester is to use out of doors, need stand the cold and hot difference variation of weather and the limit phenomenon of wriggling that insulated tension pole produces under the mechanical stress effect.This lightning arrester has been installed a soft rubber sheet 3 especially between electrode and valve block, thisly may cause great stress to offset because of two kinds of part coefficients of expansion are different, and prevent spring space air excessive formation bubble in the vulcanization forming of composite sheath, and rubber-like composite sheath 6 is under the pressure of machine, directly be close to the valve block side, and insulated tension pole coated, constitute a polymeric housed metal oxide arrester, the mechanical strength of this lightning arrester is provided by the framework that insulated tension pole and valve block post constitute, produce electric arc when lightning arrester is inner, when the gas expansion takes place, electric arc can burn composite sheath, thereby the release internal gas pressure avoids lightning arrester that comminuted blast takes place, and has had reliable pressure releasability.Through our national High-Voltage Electrical Appliances quality testing center test, confirmed the said structure principle.Overcoat is really burnt by electric arc, but lightning arrester integral body is not blasted.The lightning arrester of the general above grade of 35kv mostly is upright installation greatly when mounted, need an insulator foot be set in the lightning arrester bottom, existing producer all is as two parts independently insulator foot and lightning arrester, when the user uses, be fitted together again, this makes cost higher.And this lightning arrester can connect the core body spare that a base epoxy sleeve 10 and base flange 9 constitute a tape insulation base successively below base electrode 8, when core body spare is placed into rubber vulcanizing machine through molded vulcanization when becoming lightning arrester, also produced the insulator foot of a composite sheath, sulfuration forms the integral structure of insulator foot and lightning arrester.

The utility model is compared with existing polymeric housed metal oxide arrester, have following advantage and beneficial effect: (1) is owing to the architectural feature that this lightning arrester had determines, the mechanical strength of this lightning arrester is provided by the framework that many eradications edge pull bar and valve block post constitute, so mechanical strength is higher; (2) because the architectural feature that the utility model had produces electric arc when lightning arrester is inner, when the gas expansion takes place, electric arc can burn composite sheath, thereby the release internal gas pressure avoids lightning arrester that comminuted blast takes place, and has had reliable pressure releasability.Through the test of national High-Voltage Electrical Appliances quality testing center, confirmed that overcoat is really burnt by electric arc, the accident but lightning arrester integral body is not blasted, fail safe is higher; (3) between top electrode and spring and valve block post, adorned the soft rubber sheet by the utility model, make this lightning arrester can hold out against the cold and hot difference variation of outdoor use, exempt two kinds of rigid body part coefficients of expansion differences and cause great stress influence, make this lightning arrester reliability height, and cost is low.

Below Figure of description is further specified as follows: Fig. 1 is the structural representation of polymeric metal oxide surge arrester.Among the figure: 1 for top electrode, 2 for spring, 3 for the soft rubber sheet, 4 for valve block, 5 for insulated tension pole, 6 for composite sheath, 7,11 be pin, 8 for base electrode, 9 for base flange, 10 for the base sleeve.

Execution mode of the present utility model can be as follows: (1) by design shown in Figure 1, processing, make some parts: for example top electrode 1, base electrode 8, base flange 9 can select for use aluminium bar to be processed into through the machine-tooled method of routine, spring 2 can be made or choose in market through machine-tooled method with the 65mn steel wire, base sleeve 10 can select for use the epoxy glass fiber tube material to process through machine-tooled method, insulation railing 5 can select for use different size to order by insulating material factory or choose at material market, its specification can be the long 500mm that is, diameter of phi can be 10mm; Pin 7,11 is by market purchasing standard spare, and valve block post 4 can be selected the D5 type for use, and soft rubber sheet 3 can select for use silicon rubber to be processed into, and composite sheath 6 available silicon rubber form through the rubber vulcanization process sulfuration; (2) parts of being processed into or choosing are installed connection by the described interconnected relationship of top specification, its installation steps can be: 1. insert insulated tension pole 5 in the jack of base electrode 8 and throw pin 7 into and fix; 2. put into valve block 4, soft rubber sheet 3, spring 2, top electrode 1 successively; 3. the chipware of the formation core body of putting into is successively compressed and throw into pin 11 in the pin hole of top electrode 1 and just can make suspended-type surge arrester; 4. in the time will making the lightning arrester of band base integral structure, again base sleeve 10 tops are screwed into base electrode 8 bottoms by screw thread; 5. base flange 9 is screwed into the bottom of base sleeve 10 by screw thread; 6. at last core body spare is put in the composite sheath mould, mould is advanced rubber vulcanizing machine, after baking and mold pressing, take out, just finished the enforcement of this lightning arrester.

Claims (1)

1, a kind of polymeric metal oxide surge arrester, it is characterized in that: it is cage core body band base integral structure or suspended structure lightning arrester, it is mainly by top electrode (1), spring (2), soft rubber sheet (3), valve block (4), insulated tension pole (5), composite sheath (6), pin (7), (11), base electrode (8), base flange (9), base sleeve (10) connects and composes jointly, its mutual alignment and annexation are: core body is uniformly distributed in valve block (4) on every side by the many higher insulated tension poles (5) of tensile strength, and by insulated tension pole (5) the Connect Power utmost point (1) and base electrode (8), the spring (2) that pressure is bigger is installed on top electrode, soft rubber sheet (3) is loaded between top electrode (1) and spring (2) and the valve block post (4), rubber-like composite sheath (6) directly is close to valve block post (4) side and insulated tension pole (5) is coated, base electrode (8) is by pin (7) and insulated tension pole (5) lower end Joint, and the upper end of insulated tension pole (5) constitutes a polymeric metal oxide surge arrester by pin (11) and top electrode (1) Joint; Be connected mutually with base sleeve (10) and base flange (9) successively again below the base electrode (8) and constitute the polymeric metal oxide surge arrester of a band base integral structure.