CN2081089U

CN2081089U - In-line detector for vacuity of vacuum switch

Info

Publication number: CN2081089U
Application number: CN 90214493
Authority: CN
Inventors: 唐政清; 许钢; 崔秀华
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 1990-09-03
Filing date: 1990-09-03
Publication date: 1991-07-17

Abstract

The utility model discloses an in-line detector for vacuum degree of a vacuum switch which is a device used for detecting the vacuum degree of a vacuum switch promptly and relates to the detection for vacuum degree. The in-line detector for vacuum degree of a vacuum switch is mainly composed of a vacuum switch, a power supply and a gauge pipe, wherein, the gauge pipe is composed of a cathode, a cathode rod, a cathode lower end plate, an ignitor electrode and a magnetic steel. The cathode is columnar. A cavity which is in the shape of a scalariform through hole is arranged in the cathode. The cavity is communicated with the cavity of the electrode of the vacuum switch. The cavity is fixed with the anode bar of the ignitor electrode which is composed of two bifarious bending metal slices whose both ends are pointed and point to the inner side of the small cavity of the cathode. The anode bar of the ignitor electrode extends into the small cavity from the small cavity, which leads the ignitor electrode to be positioned in the small cavity. The utility model can be widely used for the in-line detection for vacuum degree of vacuum switches.

Description

In-line detector for vacuity of vacuum switch

A kind of vacuum degree of vacuum switch on-line measuring device that is used for the online detection of vacuum degree of vacuum switch belongs to vacuum tightness detection technique field.

The vacuum tightness of vacuum switch is lower than 10 ^-2P _aCan cause electric arc between contact not extinguish and have an accident.Therefore, be very important in vacuum switch vacuum tightness of monitoring at any time in the switching tube in service, but existing device can not be done online detection to vacuum degree of vacuum switch, use is very restricted.For example: can only do vacuum measurement to single vacuum switch according to the pick-up unit that the magnetic charging method is made, it is when measuring the vacuum tightness of vacuum switch, it must be disassembled from operating mechanism, be reinstalled again after the mensuration, and need readjust two contacts open the distance and the excess of stroke, this has brought many troubles for its use.At present, the most general device of domestic use is the device of making according to the industrial frequency withstand voltage method, can not do online detection.

Goal of the invention of the present utility model be to propose a kind of economical, cost is low, the vacuum degree of vacuum switch on-line measuring device of easy processing.

The utility model is mainly by power supply, meter pipe and vacuum switch are formed, the meter pipe is by negative electrode, negative electrode bottom plate (4), magnet steel (5), anode rod (6), ignitor electrode (7) is formed, wherein, negative electrode is column, in establish ladder hole shape cavity, this cavity is connected with the electrode cavity of vacuum switch (1), the ignitor electrode (7) that is fixed on the anode rod (6) extends in the big cavity (9) from its areola (10), ignitor electrode (7) is by two opposing bendings that are, sheet metal pointed at both ends and that sensing negative electrode areola (10) is inboard is formed, magnet steel (5) is enclosed within outside the negative electrode, be in its middle part, thickness is no more than 1/3rd of negative electrode axial length, magnet steel (5) and anode rod (6), negative electrode is coaxial, middle part negative electrode bottom plate (4) with holes is located at cathode bottom, when applying the high direct voltage of thousands of volts between anode and negative electrode, ignitor electrode produces and causes emission by force, for the discharge of counting tube space provides initiating electron.In the non-uniform electromagnetic field of quadrature, electronics can have very long stroke at the meter tube space, and produces ionization with gas molecule collision, and its positive ion bombardment cathode surface is just launched secondary electron, these electronics make gas molecule ionization with gas molecule collision again, produce new positive ion and electronics.Numerous journey that flows through of gas discharge finally makes the meter tube space set up stable self-maintained discharge, and the size of discharge current is the function of gas pressure intensity, so can measure gas pressure intensity according to the size of discharge current.

Compared with prior art, the utility model can be carried out online detection to the vacuum tightness of vacuum switch, promptly do not need vacuum switch is disassembled from its operating mechanism, do not need to break power supply yet, this has just saved the troubles such as vacuum switch is dismantled, reinstalled, readjusts that adopt prior art to bring from operating mechanism, also can avoid also having overcome the limitation that existing detector can not be done online detection simultaneously because of measuring the economic loss that vacuum degree of vacuum switch is cut off the electricity supply and caused.Have characteristics such as economic, practical, instant detection.In addition, because some part, makes handling ease as the change of ignitor electrode shape, processing cost reduces.

Fig. 1 is a meter tubular construction principle schematic of the present utility model.

Fig. 2 is the utility model meter pipe A-A cut-open view.

Fig. 3 is the synoptic diagram of a kind of embodiment of the present utility model.

The utility model can be realized by following:

The meter pipe can be arranged on of vacuum switch (1) to be had on the conducting rod of exhaust passage, the negative electrode diameter adopts 7～9 millimeters and be the best with 8 millimeters, negative electrode can directly be made by the extension of conducting rod (2), its axial length is decided according to the requirement of pressure measurement scope, the outside is the garden post, in establish garden post cavity (9) and (10) of two connections that vary in size, the diameter of big garden post cavity is greater than exhaust passage (3), their interface (8) is promptly as negative electrode bottom plate (4), anode is selected the metallic ceramics lead-in wire for use, this lead-in wire can be by kovar cap, can cut down pipe, vacuum ceramic pipe and molybdenum rod lead-in wire are formed, ignitor electrode (7) is become by the tantalum leather, it is pointed at both ends and it is welded on the anode rod (6) of anode that it is shaped as middle bent, magnet steel (5) adopts the monocycle magnet steel of axial magnetized, its axial length is no more than 1/3rd of negative electrode axial length, anode rod (6) enters areola (10) from areola (10) insertion of negative electrode until ignitor electrode (7), and the anode rod end extends in the big cavity.At last, select the 2KV high direct voltage for use, its positive pole is received the anode of counting pipe through microampere meter and current-limiting resistance (about 1M Ω), and negative pole connects its negative electrode, by the above, just can be made into the utility model.

Claims

1, a kind of pick-up unit that is used to detect the vacuum degree of vacuum switch of vacuum degree of vacuum switch, contain power supply, it is characterized in that it also comprises the meter pipe, this meter pipe is by negative electrode, negative electrode bottom plate (4), magnet steel (5), anode rod (6), ignitor electrode (7) is formed, wherein, negative electrode is column, in establish ladder hole shape cavity, this cavity is connected with the electrode cavity of vacuum switch (1), middle part cathode end plate (4) with holes is located at its bottom, magnet steel (5) is enclosed within outside it, anode rod (6) extends to big cavity (9) from its areola (10), and magnet steel (5), anode rod (6) is coaxial with negative electrode, and the ignitor electrode (7) that is fixed on the anode rod (6) is in the interior areola (10) of negative electrode.

2, pick-up unit according to claim 1 is characterized in that ignitor electrode (7) by two opposing bendings that are, and is pointed at both ends and point to the inboard sheet metal of negative electrode areola (10) and form.

3, pick-up unit according to claim 1 is characterized in that the thickness of magnet steel (5) is no more than 1/3rd of negative electrode axial length.

4, according to right 1 described pick-up unit, it is characterized in that negative electrode is the garden column, its diameter is 7～9 millimeters, wherein, is the best with 8 millimeters.

5,, it is characterized in that magnet steel (5) is enclosed among the negative electrode according to claim 1 or 3 described pick-up units.

6, pick-up unit according to claim 1 is characterized in that counting pipe and can be arranged on of vacuum switch (1) and have on the conducting rod (2) of exhaust passage.