CN201036195Y

CN201036195Y - Three-segment type structure travel switch for electric cutoff valve

Info

Publication number: CN201036195Y
Application number: CNU2007201238489U
Authority: CN
Inventors: 朱建
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-22
Filing date: 2007-03-22
Publication date: 2008-03-12
Anticipated expiration: 2017-03-22

Abstract

The utility model discloses a three-segment structure travel switch applied to an electric stop valve. In low-pressure fluid control, the utility model particularly relates to a locked-rotor-free electric stop valve used in a controllable fuel-gas meter, the travel switch has technical problems of difficult designed open-degree guarantee and questionable valve-core position signals due to the existence of different electrode formalizing deviations. The utility model modifies the traditional structure of the travel switch into a three-segment structure, effectively reduces the influence of electrode formalizing deviations and improves the performance of the travel switch applied to the electric stop valve, thereby not only effectively guaranteeing the designed open degree, but also enabling the travel switch to output reliable position signals.

Description

Electric check valve three stage structure travel switch

Technical field

The utility model is the control assembly of small-sized electric break valve, and being particularly useful for controlled gas meter, flow meter does not have among the stall electric check valve (hereinafter to be referred as the motor valve).

Background technology

Not having at controlled gas meter, flow meter needs a kind of travel switch in the stall electric check valve, this trip switch is opened at the motor valve and is provided the out-of-work signal of motor when valve puts in place, and its performance requirement is: one. and switch was accurately closed when motor promotion spool entered design aperture scope; Two. because the promotion of the no stall of motor is needed, the promotion structure of switch can be in the type frequently reciprocating situation, so construction of switch also will adapt to the motion of this frequent reciprocating manner, i.e. in the reciprocating motion process, its position signalling intensity high conformity can not interrupt; Three. the pole piece of switch does not have destructive stressed when work.For reaching above performance requirement, existing motor valve technology gets along with, as patent 2005200335514 " controlled gas meter motor valve travel switch ".This technology is reaching technical purpose aspect the frequent reciprocal promotion of the pole piece extrusion damage of eliminating switch and adaptation.But the problem that this technology exists is: the shaping of two pole pieces is required very high, if the angle of the bent reshaping of pole piece has little difference, its operation that promotes structure makes the travel switch closure, provides between the lane place of spool position signal just very big.Because signal is once providing, circuit will stop the driving to motor, and this just makes the spool aperture of electric check valve form a very big aperture interval, thereby breaks away from designing requirement.Simultaneously the compression on the contact loses consistency, can not guarantee necessary compression, so what follow appearance is the poor reliability of the aperture signal of travel switch.

Summary of the invention

The utility model will solve the problem that patent 2005200335514 " controlled gas meter motor valve travel switch " exists, and promptly the minute differences of pole piece bent reshaping causes the problem of the interval excessive and aperture signal reliability difference of the spool aperture of motor valve.

For reaching above purpose, the technical solution of the utility model is: adopt a kind of electric check valve three stage structure travel switch, this switch has the structure of promotion and switch bracket, be fixed with lower contact and pole piece on the switch bracket, pole piece has the contact, it is characterized in that pole piece has the three stage structure of preceding bending part and back bending part.The course of work of this trip switch is, when driving valve, the promotion structure of travel switch is pressed the direction motion of closing contact, the idle running section of the assurance aperture before preceding bending part, switch upper contact and lower contact can not drawn close mutually, when promoting the inclined-plane between preceding bending part of structure contact and the back bending part and promoting the inclined-plane, upper contact and lower contact begin to draw close, short chamfer length makes and promotes structure is finished switch contact on very short actuating length closed action, and the compression that makes the contact of switch reaches the determined value of ramp structure, and the spool of motor valve enters design aperture scope simultaneously.When promoting structure and entering down afterwards stable section of bending part, the closed action of switch contact is finished, and circuit stops the driving of motor.At stable section, the direction of motion that promotes structure is substantially parallel with pole piece stable section plate face, so on the optional position between them, the compression of switch contact can be basic identical.

Description from the above course of work, can see that the utility model is designed to three stage structure with the pole piece of travel switch, can make the motor valve core when reaching design aperture scope, travel switch just provides signal accurately, and its contact also can guarantee reliable contact.Because the actuating length of switch contact closed action is very short, the minute differences of pole piece shaping can not produce the influence that breaks away from designing requirement to the aperture of motor valve core, therefore adopts the utility model can overcome the problem of the interval excessive and signal reliability difference of the spool aperture of known motor valve.

Description of drawings

Accompanying drawing 1 is a structural representation of the present utility model, is the travel switch not closed state of electric check valve with three stage structure among the figure.

Accompanying drawing 2 is the utility model electric check valve structural representations when being in closure state with the three stage structure travel switch.

Embodiment

Contrast the description of drawings embodiment below, travel switch has the structure 3 of promotion and switch bracket 2 in the accompanying drawings, be fixed with lower contact 9 and pole piece 1 on the switch bracket 2, have contact 8 on the pole piece 1, particularly pole piece 1 has the three stage structure of preceding bending part 5 and back bending part 6.When travel switch carried out closure, the promotion structure 3 that spool drives guaranteed the idle running section 4 of spool aperture by the direction motion of arrow A before preceding bending part 5, promote structure 3 and do not contact pole piece 1, and what the upper contact 8 of switch and lower contact 9 were not drawn close mutually moves.When promoting the bevel phase between preceding bending part 5 of structure 3 contacts and the back bending part 6 and promoting bevel phase, pole piece 1 strain, upper contact 8 and lower contact 9 are drawn close rapidly in very little promotion stroke, and finish closed conducting in the moment that enters stable section 7, the spool aperture of electric check valve also enters within the designing requirement simultaneously, and this moment, circuit stopped the driving of motor.At stable section 7, the direction of motion that promotes structure 3 is substantially parallel with the plate face of the stable section of pole piece, therefore do not have ramp effect, rest on which relative position on the stable section 7, the basic no change of compression of the contact point on upper contact 8 and the lower contact 9 so no matter promote structure 3.Even promote structure 3 fast at stable section 7 places, the reciprocating motion on the opposite direction of arrow A and A can not change the compression of the contact point on upper contact 8 and the lower contact 9 yet.

Claims

1. electric check valve three stage structure travel switch, have promotion structure (3) and switch bracket (2), be fixed with lower contact (9) and pole piece (1) on the switch bracket (2), pole piece (1) has upper contact (8), it is characterized in that pole piece (1) has the three stage structure of preceding bending part (5) and back bending part (6).