CN103456442A

CN103456442A - Sliding rheostat

Info

Publication number: CN103456442A
Application number: CN201310398661XA
Authority: CN
Inventors: 徐冠侠
Original assignee: YUYAO KEYI EDUCATIONAL EQUIPMENTS Co Ltd
Current assignee: YUYAO KEYI EDUCATIONAL EQUIPMENTS Co Ltd
Priority date: 2013-09-04
Filing date: 2013-09-04
Publication date: 2013-12-18

Abstract

The invention discloses a sliding rheostat. The sliding rheostat comprises a bracket (3) and a protective sleeve (1), wherein a slide bar (9) and a porcelain tube (5) are arranged in the protective sleeve (1), a resistance wire (6) is sleeved at the periphery of the porcelain tube (5), the slide bar (9) is fixed above the porcelain tube (5) by a fixing piece (2) with a binding post, a slide head (10) moving left and right is sleeved on the slide bar (9), a bar-type sliding groove corresponding to the slide head (10) is arranged above the protective sleeve (1), the slide head (10) stretches out of the protective sleeve (1) through the sliding groove, an electric conduction brush connected below the slide head (10) is contacted with the resistance wire (6), conducting strips (4) are connected at the left end and the right end of the resistance wire (6) respectively, and each conducting strip (4) is connected with a binding post (8) fixed on the bracket (3). The sliding rheostat has the beneficial effects of good waterproof and dustproof effects, sensitivity in reaction and long service life.

Description

A kind of slide rheostat

Technical field

The present invention relates to a kind of variable resistor in electric field, particularly a kind of slide rheostat.

Background technology

Slide rheostat is in the calibration electric meter and a kind of rheostat often used in middle school physical experiment, resistance wire in existing slide rheostat and conduction brush be all directly exposed outside, easily be stained with the things such as dust, water, affect rheostatic performance and life-span after being stained with these foreign material, even can damage rheostat.

Summary of the invention

The defect existed for existing slide rheostat, the invention provides a kind of slide rheostat.

To achieve these goals, the technical solution used in the present invention is:

A kind of slide rheostat, comprise support and be connected to the protective sleeve on support, be provided with slide bar and porcelain tube in protective sleeve, porcelain tube is screwed in the center of support, around porcelain tube, cover has resistance wire, slide bar is fixed on the porcelain tube top by the fixture with binding post, be socketed with the slide head that can move left and right on slide bar, the top of protective sleeve is provided with the bar shaped chute corresponding with slide head, slide head stretches out protective sleeve from chute, the conduction brush that the slide head below connects contacts with resistance wire, conduction brush can be at the resistance wire surface sliding, the two ends, left and right of resistance wire respectively are connected with a conducting strip, each conducting strip all is connected with a binding post be fixed on support,

Described resistance wire is the corronil resistance wire with the anodized insulation layer;

Described protective sleeve is Split type structure, comprises protective sleeve and lower protective sleeve.

Binding post is electrically connected to electric quantity display device.

Beneficial effect of the present invention: protective sleeve is enclosed in inside by resistance wire and conduction brush, can effectively play the water proof and dust proof effect, and the protective resistance silk, be quick on the draw, long service life.

The accompanying drawing explanation

Fig. 1, STRUCTURE DECOMPOSITION schematic diagram of the present invention;

Fig. 2, overall structure schematic diagram of the present invention.

Embodiment

A kind of slide rheostat, comprise support 3 and be connected to the protective sleeve 1 on support 3, be provided with slide bar 9 and porcelain tube 5 in protective sleeve 1, porcelain tube 5 is fixed on the center of support 3 by screw 7, around porcelain tube 5, cover has resistance wire 6, slide bar 9 is fixed on porcelain tube 5 tops by the fixture 2 with binding post, be socketed with the slide head 10 that can move left and right on slide bar 9, the top of protective sleeve 1 is provided with the bar shaped chute corresponding with slide head 10, slide head 10 stretches out protective sleeve 1 from chute, the conduction brush that slide head 10 belows connect contacts with resistance wire 6, conduction brush can be at resistance wire 6 surface slidings, the two ends, left and right of resistance wire 6 respectively are connected with a conducting strip 4, each conducting strip 4 all is connected with a binding post 8 be fixed on support 3, described resistance wire 6 is the corronil resistance wire with the anodized insulation layer, described protective sleeve 1 is Split type structure, comprises protective sleeve and lower protective sleeve.

The present invention can do development test in laboratory, in calibration, is used as change electric current and voltage or the variable resistance of uncertain resistance instead in electric meter, in teaching, can demonstrate or student experiment in group for the Middle School Physics teacher.

In use procedure, if, in the time of will being used for current strength in regulating circuit, the present invention should be connected in circuit, and first by resistance adjustment at the maximum place, then connect with the mains, then the sliding conduction brush, reducing gradually resistance, is that current strength is increased to suitable current strength gradually.If while being used for the voltage of point-to-point transmission in regulating circuit, should be by the present invention and circuit parallel connection, and first by resistance adjustment to the minimum value place, then connect with the mains, then the sliding conduction brush, increase resistance gradually, is that the voltage at circuit two ends increases and applicable position gradually.

The simple replacement of those ordinary skill in the art and replacing are all within this patent protection range.

Claims

1. a slide rheostat, it is characterized in that: comprise support (3) and be connected to the protective sleeve (1) on support (3), be provided with slide bar (9) and porcelain tube (5) in protective sleeve (1), porcelain tube (5) is fixed on the center of support (3) by screw (7), around porcelain tube (5), cover has resistance wire (6), slide bar (9) is fixed on porcelain tube (5) top by the fixture with binding post (2), be socketed with the slide head (10) that can move left and right on slide bar (9), the top of protective sleeve (1) is provided with the bar shaped chute corresponding with slide head (10), slide head (10) stretches out protective sleeve (1) from chute, the conduction brush that slide head (10) below connects contacts with resistance wire (6), conduction brush can be at resistance wire (6) surface sliding, the two ends, left and right of resistance wire (6) respectively are connected with a conducting strip (4), each conducting strip (4) all is connected with a binding post (8) be fixed on support (3).

2. a kind of slide rheostat according to claim 1 is characterized in that: described resistance wire (6) is the corronil resistance wire with the anodized insulation layer.

3. a kind of slide rheostat according to claim 1 and 2, it is characterized in that: described protective sleeve (1) is Split type structure, comprises protective sleeve and lower protective sleeve.

4. a kind of slide rheostat according to claim 3, it is characterized in that: binding post (8) is electrically connected to electric quantity display device.