CN2234612Y

CN2234612Y - Pressure transducer

Info

Publication number: CN2234612Y
Application number: CN 95220190
Authority: CN
Inventors: 李育森
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-29
Filing date: 1995-08-29
Publication date: 1996-09-04
Anticipated expiration: 2005-08-29

Abstract

The utility model relates to a pressure sensor used for detecting gases and liquids. The utility model is composed of a housing, adjustable elastic static joint assemblies (joint assemblies for short), an elastic membrane, etc. The inner of one pressure sensor can be provided with a plurality of joint assemblies. Through adjusting the distance between the joint of each joint assembly and the elastic membrance, different detecting predetermined pressure can be set. Because the joint assemblies self have an elastic function, when the pressure changes, the proper function of each joint assembly and the elastic membrance can not be affected. The utility model is contacted through a guiding pillar, and can detect the pressure coming from a certain object.

Description

Pressure transducer

The utility model relates to a kind of pressure transducer that gas, fluid pressure are detected.

Pressure transducer of the prior art, general structure is complicated.As the pressure transducer among the Chinese patent ZL94245243.7, drive a movable contact reed by flexible sheet.Because this movable contact reed has certain mass, when the work on the spot of judder, contact is easily shaken, and is slightly influential to accuracy of detection.

Task of the present utility model provides a kind of simple in structure, and cost is low, is easy to produce and widely used pressure transducer.

For achieving the above object, the scheme that the utility model is taked is: on the base plane of base, an insulcrete is housed, one or several adjustable elastic break assemblies (hereinafter to be referred as contact unit) are installed on this plate.Above this contact unit flexible sheet is housed, it is the main flexible member that bears pressure, and has the effect of movable contact concurrently, and flexible sheet is connected with the upper port of base.Fix a guide pillar in the centre of flexible sheet upper surface.A protecting cover is equipped with in the base top, and it and base fit are connected to form housing.

Through hole on protecting cover enters upper plenum when gas or liquid, and its pressure acts on flexible sheet; Or through guide pillar contact, make from the pressure of object and pass to flexible sheet, elastic deformation promptly takes place in flexible sheet, produces the displacement of downward cavity direction, and its displacement is directly proportional with pressure on acting on flexible sheet.When flexible sheet moves down into when contacting with the contact of contact unit, both are on-state; When pressure reduced, flexible sheet produced resilience under the effect of itself elastic force, and the contact of flexible sheet and contact unit disengages, and both are in off-state.

This pressure transducer can adopt several contact units, adjusts the contact of each contact unit and the distance in flexible sheet centre by adjusting screw, is used for realizing detection, warning or control to different predetermined pressures.

Contact unit has three kinds of basic structures: first, second kind is made up of flexure strip and contact, is characterized in simple in structure, is convenient to make; The third is made up of spring, movable contact and shell, is characterized in that anti-shake performance is good, and reproducibility error is less when working under apocarpy.The basic function of above contact unit is: when the nearer contact of distance flexible sheet or movable contact with after flexible sheet contacts, if flexible sheet is constantly continuing to move down under the increased pressure effect, contact or movable contact can move down thereupon, can avoid both roof pressures and damage.Simultaneously, do not influence the normal function of flexible sheet and other contact or movable contact; When the pressure minimizing, after the flexible sheet resilience, contact or movable contact will return to the position of originally having set up under the elastic force effect of flexure strip or spring.This function is applicable to the pressure transducer that a plurality of contact units are installed.

Advantage of the present utility model is as follows:

(1) directly replaces the movable contact reed by flexible sheet, shake is reduced.

(2) in a pressure transducer, a plurality of contact units can be installed, and set up, be independent of each other by different predetermined pressures.

Below in conjunction with drawings and Examples the utility model is elaborated.

Fig. 1 is the structural representation of the utility model first embodiment.

Fig. 2 is the contact unit scheme of installation of the utility model second embodiment.

Fig. 3 is the contact unit structural representation of the utility model the 3rd embodiment.

In structural representation shown in Figure 1, fix an insulcrete [11] on the base [2], one or several contact units are installed on it.Contact unit is made up of flexure strip [6] and contact [13], and their fixed endpoint is fixed on the insulcrete [11] with the mode of conductive rivet [9] or welding.Upper port in base [2] is equipped with flexible sheet [3], and both do the impermeability combination by joint face [8].Flexible sheet [3] is the main flexible member that bears pressure, and has the effect of movable contact concurrently.Constitute cavity [14] down between base [2] and the flexible sheet [3].Base [2] and protecting cover [1] are combined as a whole by fit face [16], constitute the housing of this pressure transducer.Form upper plenum [7] between protecting cover [1] and the flexible sheet [3].On the insulcrete [11] of corresponding flexure strip [6] on-fixed end, done internal thread, in debug whole screw [15], be used to adjust the distance between corresponding contact [13] and the flexible sheet [3], when being set in each predetermined pressure, allow each contact [13] and flexible sheet [3] be in on-state.Guide pillar [5] is loaded on the centre of flexible sheet [3] upper surface, makes from the pressure of object and passes to flexible sheet [3]; Through the through hole [4] on the protecting cover [1], gas or liquid enter upper plenum [7], and its pressure directly acts on flexible sheet [3].When elastic deformation takes place in flexible sheet [3] effect of being stressed, the displacement that produces downward cavity [14] direction.When pressure reached less predetermined value, flexible sheet [3] was connected with the contact [13] of close together, continues to increase as pressure, and flexible sheet [3] will promote this contact [13], overcome the elastic force effect of flexure strip [6], continue to move down.When pressure reached big predetermined value, flexible sheet [3] was connected with corresponding contact [13]; When the pressure that acts on flexible sheet [3] reduces, flexible sheet [3] produces resilience under self elastic force effect, at first with than the contact of connecting under the big predetermined pressure [13] disengage, other contact [13] is under the effect of flexure strip [6] resilience simultaneously, move up with flexible sheet [3], when pressure was reduced to low predetermined value, corresponding contact returned to the position of having set up, and flexible sheet [3] disengages with corresponding contact [13].

The switching process of each contact [13] and flexible sheet [3] will be carried out successively with the ascending or descending order of the pressure that acts on flexible sheet [3].

Each contact unit all is connected with separately output lead [10], and they become output terminal of the present utility model with concentric line [12] mutual group.Detection, control circuit that its inner switching can be prior art provide input signal.

Contact unit employed in figure 1 is made up of flexure strip [6] and contact [13], and the characteristics of this contact unit are simple in structure, and assembling can be assembled two contact units in the pressure transducer easily.The pressure transducer that adopts this contact unit is first embodiment of the present utility model.

Fig. 2 is the scheme of installation that adopts another kind of structure contact unit.This contact unit also is made up of flexure strip [6] and contact [13], is characterized in can assembling many contact units in a pressure transducer.The pressure transducer that adopts this assembly is second embodiment of the present utility model

Fig. 3 is the structural representation of another contact unit.This contact unit is made up of shell [17], movable contact [18] and spring [19].Shell [17] is to have externally threaded cylinder-like body, interior dress movable contact [18] and spring [19].By spring [19] movable contact [18] is pushed up the top of shell [17], its tip portion stretches out on shell [17].This contact unit is by pack into internal thread on the insulcrete [11] of the external thread on the shell [17].Therefore, this contact unit also has the effect of adjusting screw concurrently.Adopt the pressure transducer of this contact unit, be characterized in to assemble many contact units in the pressure transducer; Anti-shake performance is good, when under the bigger state of centrifugal force, working, reproducibility error is less.The pressure transducer that adopts this contact unit is the 3rd embodiment of the present utility model.

Claims

1. pressure transducer, by shell, flexible sheet and adjustable elastic break assembly (hereinafter to be referred as contact unit) are formed, it is characterized in that: fix an insulcrete [11] on the base plane of base [2], one or several contact units are installed above, contact unit is made up of flexure strip [6] and contact [13], their stiff end is fixed on the insulcrete [11], upper port in base [2], flexible sheet [3] is housed, both do the impermeability combination by joint face [8], constitute cavity [14] down between base [2] and the flexible sheet [3], base [2] and protecting cover [1] constitute housing by fit face [16] combination, form upper plenum [7] between protecting cover [1] and the flexible sheet [3], on the insulcrete [11] of corresponding flexure strip [6] on-fixed end, done internal thread, in debug whole screw [15], guide pillar [5] is loaded on the centre of flexible sheet [3] upper surface, has done through hole [4] on protecting cover [1].

2. pressure transducer, by shell, flexible sheet and adjustable elastic break assembly (hereinafter to be referred as contact unit) are formed, it is characterized in that: fix an insulcrete [11] on the base plane of base [2], one or several contact units are installed above, the shell of contact unit [17] is to have externally threaded cylinder-like body, interior dress movable contact [18] and spring [19], movable contact [18] is pushed up the top of shell [17] by spring [19], its tip portion stretches out on shell [17], by the external thread on the shell [17], with pack into internal thread on the insulcrete [11] of contact unit, upper port in base [2], flexible sheet [3] is housed, both do the impermeability combination by joint face [8], constitute cavity [14] down between base [2] and the flexible sheet [3], base [2] and protecting cover [1] constitute housing by fit face [16] combination, form upper plenum [7] between protecting cover [1] and the flexure strip [3], guide pillar [5] is loaded on the centre of flexible sheet [3] upper surface, has done through hole [4] on protecting cover [1].