CN2463815Y

CN2463815Y - Fluid pressure transducer

Info

Publication number: CN2463815Y
Application number: CN 00267785
Authority: CN
Inventors: 韩悦东
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-27
Filing date: 2000-12-27
Publication date: 2001-12-05
Anticipated expiration: 2010-12-27

Abstract

The utility model relates to a liquid pressure sensor, particularly a sensor used for measuring the lub-oil pressure of an engine. The upper end part of a center hole B of a base is fixedly connected with a corrugated diaphragm box which is formed by that two slices of metal corrugated diaphragms are overlapped to be welded. The upper end surface of the corrugated diaphragm box is provided with a flat center which contacts a rocking frame mechanism through a roller. A rocking plate is fixedly provided with a spring slice which contacts a wire-wound resistor plate in a sliding mode. The utility model has the advantages of reasonable structure, stable sensing performance, volume reduction, sealing area reduction and high sensing precision, a sensing element adopts the corrugated diaphragm box, the transferring pressure is improved by 2.5 times, the pressure resistance of the sensing element is improved, the service life can reach hundreds of thousands of times and the sensing precision can reach an instrument accuracy standard with 2.5 levels.

Description

Fluid pressure sensor

The utility model relates to a kind of fluid pressure sensor, in particular for measuring the sensor of engine motor oil pressure.

In the prior art, engine pressure sensor both domestic and external all is to adopt metallic membrane as sensing element, when pressure fluid is chewed when entering in the sensor convoluted diaphragm chamber through shell oil, owing to the little displacement that produces of diameter of diaphragm is too big, only depend on a spring leaf to reset during resilience.The general diameter of this sensor is 45 millimeters on the market, highly be 50 millimeters, under 0.6MPA pressure, will produce 1 millimeters of vertical displacement, the indicating value point is generally 3-4, this structural design does not satisfy the required precision of output signal, cause product indicated value instability, zero point drift, return difference are big, defective such as serviceable life is low.In addition in the existing structure, each mechanism transmission error between the parts in addition is bigger, does not reach design accuracy, and the protruding platform of diaphragm upper end drives the swing of pendulum plate mechanism by a push rod, and it is big that flat center and push rod contact friction.Each transmission shaft component of rocker mechanism is too many, has the decentraction problem, and the tensile force of belt two-man act sheet that is fixed on the pendulum plate slides on the wire-wound resistance board, because the contact friction is big, directly influences the precision of resistance variations.

The purpose of this utility model be for overcome above-mentioned deficiency provide a kind of rational in infrastructure, volume is little, sensing accuracy is high, the fluid pressure sensor that is used to measure engine oil pressure of long service life.

The utility model is realized by following measure:

A kind of fluid pressure sensor, form by base, shell, wavy metal diaphragm, rocker mechanism and wire-wound resistor plate, there is a threaded hole B in base central authorities, its upper end has threaded boss, and be threaded with ripple sylphon by an O-ring seal, ripple sylphon is formed by the identical convoluted diaphragm stitch welding of two plate shapes, the ripple sylphon upper surface has flat center to contact at the C face with rocker mechanism by roller, roller is connected with the roller adjustment sheet with the pendulum plate by turning rolls, pendulum is fixed the spring leaf of a biplate on the plate, and with the sliding contact of wire-wound resistor plate.The ripple sylphon diameter is the 30-70 millimeter, highly is the 4-25 millimeter, and the ripple of ripple sylphon is 2-4.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the A-A diagrammatic cross-section of Fig. 1;

Fig. 3 is the ripple sylphon structural representation of embodiment;

Among the figure: 1, base 2, boss 3, ripple sylphon 4, wavy metal diaphragm

5, extension spring 6, shell 7, flat center 8, roller

9, rocker mechanism 10, turning rolls 11, pendulum plate 12, roller adjustment sheet

13, spring leaf 14, mechanism's support plate 15, supporting base 16, pendulum panel seat

17, pendulum plate fulcrum 18, resistance board support 19, bolt 20, wire-wound resistor plate

21, O-ring seal 22, shell plastic 23, signal output board

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

Embodiment 1 as shown in Figure 1 and Figure 2, fluid pressure sensor has base 1 and shell 6, there is a tapped through hole B in the central authorities of base, its upper end has threaded boss 2, is threaded with ripple sylphon 3 by an O-ring seal 21.Ripple sylphon is one by the identical wavy metal diaphragm 4 of two plate shapes of 45 millimeters of diameters in periphery sealing stitch welding as shown in Figure 3, and ripple sylphon is 45 millimeters of diameters, 7 millimeters of height, and its ripple has 2.There is flat center 7 upper surface of ripple sylphon, mechanism's support plate 14 of upper end build-in one annular of base, the F supporting surface of mechanism's support plate is rocker mechanism 9 fixedly, rocker mechanism is made up of pendulum plate 11, roller 8, turning rolls 10, roller adjustment sheet 12 and spring leaf 13, the flat center that is fixed on the ripple sylphon contacts at the C face with rocker mechanism by roller, roller is equipped with in the turning rolls lower end, middle nested pendulum plate of riveting with the roller adjustment sheet, upper end are fixed on the roller adjustment sheet by bolt 19 and make roller in the contacted position of C face and flat center with the pendulum plate.Pendulum plate one end is connected on mechanism's support plate by extension spring 5, its both sides of the other end of pendulum plate have supporting base 15 to be fixed on the support plate F of the mechanism face respectively, there is a pendulum plate fulcrum 17 on a center line, two pendulum panel seats 16 to be separately fixed at two supporting base inboards, the pendulum plate is welded on the pendulum panel seat, the

spring leaf

13 and 20 sliding contacts of wire-wound resistor plate of riveted joint one biplate on the pendulum plate, two resistance board supports 18 are fixed in welding on the relevant position of mechanism's support plate, and its upper end is fixedly connected as an integral body with bolt 19 with wire-wound resistor plate 20 and resistance board support respectively.A shell plastic 22 is fixed in the shell upper end, and the resistance wire output terminal on the wire-wound resistor plate passes the shell plastic, is fixed on the signal output board 23.

When the utility model is in running order, pressure fluid is through the oilhole B of base central authorities, enter in the ripple sylphon chamber of sealing, ripple sylphon produces the variation of upper and lower displacement with the variation of hydrodynamic pressure size, at this moment the roller with the flat center contact of ripple sylphon upper surface produces relative slip along C face and flat center, swing thereby drive rocker mechanism, just the variation of the upper and lower displacement of ripple sylphon is converted to the motion that rocker mechanism swings around pendulum plate fulcrum by roller.At this moment the spring leaf that is fixed on the monolithic on the pendulum plate because the variation of displacement changes resistance length, also changes the resistance signal of output along with swinging in the enterprising line slip of the surface of contact of wire-wound resistance board.The rectangular cross section of surface of contact E of spring leaf and wire-wound resistor plate is no wide variety contact, has improved the precision of sensor.

The utility model has the advantage of:

1. because sensing element adopts the ripple sylphon of sealing, rational in infrastructure, globality is strong, sensing capabilities is stable.

2. ripple sylphon is formed by two convoluted diaphragm stitch welding, and ripple sylphon adopts with base and is threaded simultaneously, reduces Sealing area, avoided the leakage of liquid under the HTHP, improved the compression resistance of sensing element.

3. reduced volume, transmitted pressure by original 0.6MPA, improved 2.5 times, can reach 1.5MPA with the sensor of diameter.

-40 ℃-120 ℃ shock-resistant, reach hundreds of thousands time serviceable life.

5. improved the transferring structure between each parts of rocker mechanism, owing to adopt roller and biplate spring leaf, reduced the contact friction, the sensing accuracy height reaches 2.5 grades of accuracy of instrument standards fully.

Claims

1. fluid pressure sensor, be by base (11), shell (6), wavy metal diaphragm (4), rocker mechanism (9) and wire-wound resistor plate (20) are formed, it is characterized in that there is threaded hole B in base central authorities, its upper end has threaded boss (2) and is threaded with ripple sylphon (3) by an O-ring seal (21), ripple sylphon (3) is formed by the identical convoluted diaphragm of two plate shapes (4) stitch welding, the ripple sylphon upper surface has flat center (7) to contact at the C face with rocker mechanism (9) by roller (8), roller is connected with roller adjustment sheet (12) with pendulum plate (11) by turning rolls (10), pendulum is fixed the spring leaf (13) of a biplate on the plate, and with wire-wound resistor plate (20) sliding contact.

2. fluid pressure sensor according to claim 1 is characterized in that ripple sylphon (3) diameter is the 30-70 millimeter, highly is the 4-25 millimeter, and the ripple of ripple sylphon is 2-4.