CN2426821Y

CN2426821Y - Fluid media pressure sensor for vehicle and ship

Info

Publication number: CN2426821Y
Application number: CN 00230117
Authority: CN
Inventors: 金太来; 范旭
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-06-07
Filing date: 2000-06-07
Publication date: 2001-04-18
Anticipated expiration: 2010-06-07

Abstract

The utility model relates to a fluid medium pressure sensor for a vehicle and a ship. The utility model is characterized in that a corrugated pipe cavity chamber is combined with a sliding contact through an insulating piece; the contact moves along the radial direction corresponding to a linear type grating element plate; two pressure springs are positioned at both sides of a spring bearing frame at the upper part of the cavity chamber; guide pillars are respectively inserted into the pressure springs in a concentric mode; the upper part of each spring is provided with a spring stiffness trimming nut. Following the rise and fall of the pressure of an oil circuit, the corrugated pipe cavity chamber and the top part move to drive the contact to move from top to bottom so that the output resistance of a grating element resistance plate and the pressure of the oil circuit of the sensitive cavity are altered. The utility model has the advantages of little drift for measurement results, high accuracy and long service life, and the utility model is a two-wire system.

Description

Car, ship fluid pressure medium sensor

The utility model relates to car, ship fluid pressure medium sensor.

The known car and boat lubricating oil pressure measured sensor that is used for, extensively adopt the responsive theory structure of German VDO as shown in Figure 1: tested oil pocket and one measure film and close connection, and when film closed inner engine oil pressure and changes, film closed protuberance or falls, about variation 0.4mm.Slided on chain-wales by bead, drive lever and rotate around fulcrum, through tens of times of amplifications, cause that contact slides on wire-wound resistance, change resistance value, the electric current that causes flowing through gauge outfit P changes, thus size that can responsive vent line pressure.

As seen from Figure 1, the shortcoming of known technology is: when diaphragm trace when tired takes place, when trace takes place and changes in bead circularity in frequent friction, when fulcrum and lever rotation gap, cooperation place trace takes place increase, amplify the gross errors that all can cause result of a measurement through tens of times of machineries.Directly at high temperature work measurement temperature drift amount as a result is very big for the bellows sheet.Shown by above-mentioned: its metering system accuracy is low, the life-span short.And " signal ground " unavoidable and casing is electrically connected, and is unfavorable for the measuring system disturbance rejection.

The purpose of this utility model is to overcome the shortcoming of above-mentioned pressure sensor, thus provide a kind of life-span long, measure good reliability, two wire system pressure sensor that accuracy is high.

For finishing above-mentioned task, the technical solution of the utility model is: adopt compressed setting to be the bellows chamber of extension spring state, its top with a plug seal, built-in corrugated pipe guidepost, bellows axially stretches with the raising of internal pressure, slider is equipped with in a side at plug, slider is by insolator disc and plug combination, and this contact moves relative to straight line grid element resistance board.Bearing spring frame of plug top nested, two stage clip balance sits drop on the both sides of bearing spring frame, and each inserts a guide upright post with one heart in two stage clips, and a spring stiffness fine-tuning nut respectively is equipped with on the top of two stage clips of guide upright post.Slider should guarantee to be the 1-6 ° of angle that tilts with the plane when mounted.Grid element plate face can be resistance unit wire-wound, photoetching, or is grating.

The advantage of technical solutions of the utility model is: owing to cancelled the mechanical shaft thick stick amplifier of known technology, so the two process lag errors that pressure can be risen, descend are fallen very for a short time; Its mechanical balance key element mainly is that two stage clips that are positioned at beyond the high-temperature medium substitute the known technology diaphragm, so the result of a measurement drift value is little, accuracy height, life-span are long; And " signal ground " and casing insulation, never be electrically connected, help the measuring system disturbance rejection.Because conductive contact is by insolator disc and integral insulation, so can make the two wire system sensor.The two wire system sensor is widely used in automated detection system and ship machine testing system.

The utility model description of drawings is as follows: accompanying drawing 1 is the known technology structure principle chart; Accompanying drawing 2 is the utility model structure principle chart.

The utility model is described in further detail below in conjunction with accompanying drawing.

As accompanying drawing 2: compressed setting is the bellows chamber 14 of extension spring state, its top with a plug seal, built-in corrugated pipe guidepost 11, bellows axially stretches with the raising of internal pressure, slider 10 is equipped with in a side at plug, slider 10 is by insolator disc 8 and plug combination, and this contact moves relative to straight line grid element resistance board 9.13, two stage clip 15 balance sits of bearing spring frame of plug top nested drop on the both sides of bearing spring frame 13, or many stage clip 15 balances are distributed on around the bellows.Each inserts a guide upright post 12 with one heart in two stage clips 15, and a spring stiffness fine-tuning nut 16 respectively is equipped with on the top of 12 two stage clips 15 of guide upright post.Slider 10 should guarantee to be the 1-6 ° of angle that tilts with the plane when mounted.Grid element resistance board 9 can be resistance unit wire-wound, photoetching, or is grating.Lubricating oil in tested oil circuit enters bellows cavity 14 by oil inlet, along with the oil circuit pressure lifting, bellows top up-and-down movement, thereby drive contact 10 up-and-down movements of bellows top one side, along with the motion of contact 10 on resistance board 9 palisade conducting surfaces, can change its output resistance size, thus the size of responsive oil circuit pressure.

Claims

1, a kind of car, ship fluid pressure medium sensor is characterized in that: a weak stiffness seal bellows chamber (14), and the one side is fixed with slider (10) by insolator disc (8), this contact (10) grid element plate face (9) motion relatively; Bellows chamber (a 14) top bearing spring frame of suit (13), two pressing springs (15) balance sit drops on the both sides of bearing spring frame (13).

2,, it is characterized in that the bellows in the said seal bellows chamber (14) is the extension spring state through the setting processing as claims 1 described car, ship fluid pressure medium sensor; And guidepost (11) arranged in the chamber.

3, car as claimed in claim 1, ship fluid pressure medium sensor, it is characterized in that: said slider (10) installation direction and sagittal plane are 1-6 ° of leaning angle.

4, car as claimed in claim 1, ship fluid pressure medium sensor, it is characterized in that: said stage clip (15) also can be to be located on the bearing spring frame (13), and balance is distributed on many springs around the bellows or is sleeved on a spring on the bearing spring frame (13); And, all pressing a spring stiffness to proofread and correct nut (16) on each spring.

5, car as claimed in claim 1, ship fluid pressure medium sensor, it is characterized in that: said grid element plate face (9) can be resistance unit wire-wound, photoetching, or is grating.