CN1119469A - 压差测量变送器 - Google Patents

压差测量变送器 Download PDF

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CN1119469A
CN1119469A CN94191465A CN94191465A CN1119469A CN 1119469 A CN1119469 A CN 1119469A CN 94191465 A CN94191465 A CN 94191465A CN 94191465 A CN94191465 A CN 94191465A CN 1119469 A CN1119469 A CN 1119469A
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pressure difference
difference measurement
electrical lead
measurement converter
hole
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CN1059035C (zh
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沃纳·西斯
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Siemens AG
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/14—Housings
    • G01L19/142—Multiple part housings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
    • G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0007—Fluidic connecting means
    • G01L19/0038—Fluidic connecting means being part of the housing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0061—Electrical connection means
    • G01L19/0084—Electrical connection means to the outside of the housing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0627—Protection against aggressive medium in general
    • G01L19/0645—Protection against aggressive medium in general using isolation membranes, specially adapted for protection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
    • G01L9/06—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of piezo-resistive devices

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

本发明涉及一种压差测量变送器，其带有与其纵轴横向分开成两部分的内箱，在两个箱体之间固定了一个带有压力传感器的中隔膜，其中一个箱体在一个孔内装有一根电引线，该引线有外部接头位于孔的延伸处。考虑到电引线，为在制造本压差测量变送器简化电引线，孔31与测量变送器的纵轴32平行。孔31在其与另一箱体部件的相向端有一扩大部分33，在与另一箱体部件3的相对端变成一个通向外部的横孔44。

Description

压差测量变送器
本发明涉及一种压差测量变送器，其带有与其纵轴垂直的两分开的内箱，在两个箱体之间固定了一个带有压力传感器的中隔膜，其中一个箱体在一个孔内装有一电引线，该引线有外部接头位于孔的扩大部分。
在已有的压差测量变送器中(US4135408)容放电引线的孔从外向内横穿测量变送器的纵轴。该孔向外扩展，以便电引线能以外接头挤压内凸台。在外接头和内凸台之间安有O型圈，以便与外部实现可靠的密封。在已有的压差测量变送器中，由于测量变送器内部的全部静压力作用在电引线上，因此电引线的外部接头用坚固的螺栓固定在孔的内部。
本发明的目的在于提出一种压差测量变送器，使电引线的安放相对简便的实现。
本发明的目的是这样实现的，即提供一种本发明开头给定的形式的压差测量变送器，其与纵轴平行的孔在与另一个箱体部件的相向端有一扩大部分，而在与另一箱体部件的相对端变成一个通向外部的横孔。
依照本发明的压差测量变送器的主要优点在于，通过孔的安置和扩展，使电引线以其外部接头通过静内压挤压一个因孔的扩大而形成的接头，这样由于静内压产生于电引线上的压应力被箱体所承受。一个用于承受施加于电引线的静压力的牢固的螺栓联结，在按照本发明的压差测量变送器中是不必要的。
按照本发明的压差测量变送器以有利的方法，容纳电引线的孔的布置和电引线的引入使电引线在其外接头部分与箱体焊接成为可能。在这里焊接仅仅用于内部对外部的密封；焊点不承受压力负荷，因此不需要很高的质量要求。
按照本发明的压差测量变送器，其压力传感器和电引线之间的电联结可以采用各种的方法实现，例如通过单个的电导线。当压力传感器和电引线之间用一种带状导电箔联结时，做为特别突出的优点是在于其装配时的简易性。尽管一种压电阻(Piezoresistiv)测压装置其联结总线(Bonddraehte)直接与引线在一种塑料薄膜材料层上联结已通过DE3500613A1公知，然而却不能将一种已制成的、装有联结板(Bondplatte)和外壳的压力传感器与电引线以简单的方式方法联结在一起。
在考虑到通常的、在本发明的压力测量变送器中可用的压力传感器的设计高度时，使带状导体箔通过弯曲在压力传感器旁紧贴于中隔膜上是有优势的。采用这种方法可以方便的排除中隔膜以及安放其上的压力传感器的运动自由度的影响。
考虑到压力传感器和电导线之间的电联结，为使本发明的压力测量变送器的特别简单的装配成为可能，让带状导体箔在电引线部分构成环形是有利的。通过这个环可以将带状导电箔按照其与压力传感器的电流联结，采用较简易的方法与电引线的电接头焊接，因为对这个焊点的可接近性通过这个环的打开而得到特别好的保证。
本发明通过附图再作说明：
图1为本发明的压差测量变送器一实施例的纵剖面。
图2为图1所示的压差测量变送器内箱的箱体部件部分的分解图。
图1所示的压差测量变送器有一个内箱1，该内箱包括在图上部的箱体部件2和另一个(在图下部的)箱体部件3。箱体部件2有一个中心凹槽4；另一箱体部件3有另一中心凹槽5。在由中心凹槽4和5构成的空腔里有一个压力传感器6，该压力传感器被固定在中隔膜7上。中隔膜7位于内箱1的箱体部件2和3之间并在外边缘8以公知方式通过焊接而固定。
压力传感器6可以是例如单个结构的，如同G.埃尔勒(G.Ehrler)在海德保89年3月14-15日举办的微力学AMA研讨会上发表的“压电阻-硅-单位压力传感器(Elmentardrucksensoren)”一文中第81至95页所描述的。压力传感器由目前已公知的传感元件9所组成，并且用同样公知的方法固定在联结板10上。其电接头通过一个带状的导体箔11与电引线12相联结，下面在图2的描述中对此还有详细解释。
箱体部件2的中心凹槽4通过一个内部通道13以公知方式由分隔膜14与通过孔16引入压力的前室15压力传导性的相联结。前室15由一个外部壳盖17内的凹槽形成。
相应地，另一个箱体部件3的中心凹槽5通过另一个内部通道18和另一分隔膜19与通过孔21引入另一个压力的另一前室20压力传导性的相联结。前室20由另一个壳盖22形成。壳盖22通过紧固螺栓23和24与另一个壳盖17以止口压住O形圈25和26固定。
在两个箱体部件2和3的内通道13和18内部有以公知方式通过通道27和28注入的油；该通道27和28随后通过仅示意表示的闭塞装置29和30严密锁紧。
此外如图1所示，箱体部件2有一个与压差测量变送器纵轴32平行的孔31。该孔31的在其与另一个箱体部件3的相向端上有一扩大部分33。电引线12有一个相应的接头34在电引线12的外金属柱体35旁。电引线12以该外接头34挤压由扩大部分33构成的凸台36。
电引线12含有埋入玻璃体37的由电引线两侧突出的触针38。因此有此可能，图1中触针38的下端39与带状导体箔相联结，该箔弯曲后在一平面内平行于中隔膜7并围绕陶瓷件40形成一个环41，以便通过在返回压力传感器方向上的端与触针38焊接。此外，另一个陶瓷件42已经预先穿过触针38的末端39。在图1示的上端触针38同样与线路在另一个带状导电箔43上焊接。这另一个带状导电箔通过一个延伸到孔31的横孔44被引到外面。
在图1所示的压差测量变送器中，电引线12下部的空间受到静压力的冲击，由此也影响到电引线12。由此产生的施加于电引线12的负荷通过外接头34由箱体部件2承受，于是在外部接头的周围有一单一的焊缝就足够使压差测量变送器的内部对外部良好密封。进一步的用于在电引线周围承受静压力的措施是不必要的。
图2摘引的是已经装有联结板10的压力传感器6与中隔板7的联结，其与图1一致的部件以相同符号标示。在一般情况下，具有与压力传感器6的电连接插销的安放相适应的凹槽的陶瓷件50用于使常规下带有金属壳的压力传感器6与带状导电箔11绝缘。
当带状导电箔11在其相连部分52处与压力传感器6的电连接插销51焊接之后，装上陶瓷盖板53，为的是当中隔膜7相对于箱体部件2出现大的偏移时，压力传感器6具有良好的绝缘。
另一方面，在内箱1的箱体部件2和3进一步接合之前电引线12应被装入箱体部件2的孔31内，同时触针38于另一个带状导电箔43的端点54焊接。接着将另一个陶瓷件42接在电引线12的触针38的另一端39(图2未画出)上，然后焊接带状导电箔11的另一端55。在此装配应构成一个围绕瓷片40的带状导电箔环，瓷片40在此的作用是防止带状导电箔11在环范围里弯曲。
如果照此进行装配，则内箱的箱体部件2和3可以在装有压力传感器6的中隔膜7固定后焊接在一起。

Claims (5)

1.压差测量变送器，带有与其纵轴横向分开成两部分的内箱，在两个箱体之间固定了一个带有压力传感器的中隔膜，其中一个箱体在一个孔内装有一根电引线，该引线有外部接头位于孔的延伸处，
其特征在于：孔(31)与纵轴(32)平行；孔(31)在其与另一箱体部件的相向端有一扩大部分(33)，在与另一箱体部件3的相对端变成一个通向外部的横孔(44)。
2.根据权利要求1所述的压差测量变送器，
其特征在于：电引线(12)在其外部接头(34)处与箱体部件(2)焊接。
3.根据权利要求1或2所述的压差测量变送器，
其特征在于：在压力传感器(6)与电引线(12)之间有一带状导电箔(11)。
4.根据权利要求3所述的压差测量变送器，
其特征在于：带状导电箔(11)通过弯曲在压力传感器(6)旁与中隔膜7紧贴。
5.根据权利要求3或4所述的压差测量变送器，
其特征在于：带状导电箔(11)在电引线(12)周围构成一个环(41)。
CN94191465A 1993-03-15 1994-03-09 压差测量变送器 Expired - Fee Related CN1059035C (zh)

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DEP4308718.3 1993-03-15
DE4308718A DE4308718C2 (de) 1993-03-15 1993-03-15 Druckdifferenz-Meßumformer

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CN1119469A true CN1119469A (zh) 1996-03-27
CN1059035C CN1059035C (zh) 2000-11-29

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EP (1) EP0689668B1 (zh)
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KR (1) KR960701356A (zh)
CN (1) CN1059035C (zh)
AT (1) ATE162624T1 (zh)
DE (2) DE4308718C2 (zh)
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CN103063356A (zh) * 2012-12-25 2013-04-24 天津俞昌科技有限公司 一种高精度差压变送器

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DE4308718C2 (de) 1996-04-25
JPH08507862A (ja) 1996-08-20
DE4308718A1 (de) 1994-09-22
EP0689668B1 (de) 1998-01-21
DE59405115D1 (de) 1998-02-26
ATE162624T1 (de) 1998-02-15
EP0689668A1 (de) 1996-01-03
JP3408813B2 (ja) 2003-05-19
KR960701356A (ko) 1996-02-24
US5596148A (en) 1997-01-21
CN1059035C (zh) 2000-11-29
WO1994021992A1 (de) 1994-09-29
RU2114407C1 (ru) 1998-06-27

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