EP0173090A1 - Organe presseur pour interrupteur ou régulateur de pression - Google Patents

Organe presseur pour interrupteur ou régulateur de pression Download PDF

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Publication number
EP0173090A1
EP0173090A1 EP85109478A EP85109478A EP0173090A1 EP 0173090 A1 EP0173090 A1 EP 0173090A1 EP 85109478 A EP85109478 A EP 85109478A EP 85109478 A EP85109478 A EP 85109478A EP 0173090 A1 EP0173090 A1 EP 0173090A1
Authority
EP
European Patent Office
Prior art keywords
pressure
bimetallic
spring
sensor according
pressure sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85109478A
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German (de)
English (en)
Other versions
EP0173090B1 (fr
Inventor
Peter Oliver Honegger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huba Control AG
Original Assignee
Huba Control AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huba Control AG filed Critical Huba Control AG
Publication of EP0173090A1 publication Critical patent/EP0173090A1/fr
Application granted granted Critical
Publication of EP0173090B1 publication Critical patent/EP0173090B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/28—Compensation for variation of ambient pressure or temperature

Definitions

  • the invention relates to a pressure transmitter according to the preamble of claim 1.
  • Such a pressure transmitter is used either to actuate a switching contact in a pressure switch or to emit a constant output signal, which can be an electrical or a pneumatic signal. It can serve as an input signal for a continuously acting controller or a two-point controller.
  • the pressure to be measured by the pressure transmitter can be a differential pressure, a negative pressure or an excess pressure.
  • the switching point can be set within a limited range.
  • the sensor element to which pressure can be applied is usually a membrane or occasionally also a piston.
  • the switching accuracy or the scanning accuracy is influenced by fluctuations in the ambient temperature.
  • the main causes of the influence are the changing flexing forces, in particular in the case of rubber membranes, and in the case of heat-expanding housings, in particular in the case of plastic parts.
  • Circuit arrangements for compensating the ambient temperature are known in the case of electronic transmitters, but these generally relate to the fluctuations caused in the electronic components, the characteristics of which largely differ from the mechanically caused fluctuations.
  • the invention is therefore based on the object of creating a pressure transmitter in which the influences of the ambient temperature do not or only very slightly influence the switching or scanning accuracy.
  • the solution according to the invention is characterized by its simplicity and is largely applicable to already existing constructions.
  • the effect of the spring is changed by the bimetallic element arranged in series with the spring, in order to compensate for the temperature-related changes in the membrane, the housing parts and the changed friction conditions.
  • Claims 2 and 3 indicate preferred embodiments, according to which the bimetallic element is arranged between the spring and the supporting adjusting element. It follows from this that the bimetal element can be designed as an intermediate layer.
  • a particularly preferred embodiment according to claim 4 enables the compensation effect of the bimetal element to be compared in a simple manner by adding or removing bimetal disks.
  • the bimetal disks are lined up alternately on a mandrel as perforated disks.
  • the alternating arrangement results in a larger stroke than an arrangement in the same direction, since the strokes of the individual disks add up.
  • An embodiment according to claim 6 corresponds not only to a structurally favorable solution, but is also associated with the advantage that the bimetallic disks prevent the spring from turning when the pressure adjusting screw is adjusted, since they can be easily rotated relative to one another. This enables the setting accuracy to be increased because disruptive deviations in the switching point are avoided by turning the spring.
  • a chamber 10 which can be acted upon by the pressure to be measured is closed off by means of a membrane 12, which is reinforced by a disk 14 on the side opposite the pressure.
  • a plunger 16 is supported on the disk 14, the opposite end of which is centered in a guide piece 20 connected to a leaf spring 18 clamped on one side.
  • a compression spring 22 engages the guide piece 20, which loads the membrane 12 serving as a pressurizable sensor element against the pressure to be measured.
  • the leaf spring 18, which acts as an actuating element is coupled at its free end to a c-shaped snap spring 24, which engages a switching contact 28 biased against a fixed contact 26.
  • the bias of the compression spring 22 is adjustable on a pressure adjusting screw 34, on which the pressure spring 22 is supported by means of a plate-like vaulted bimetal disk 36 of a bimetal element 38.
  • the bimetallic disks 36 are perforated in their center and lined up alternately on a mandrel 40 which is rigidly connected to the pressure adjusting screw 34.
  • a second guide piece 42 is located between the lowermost bimetallic disk 36 and the compression spring 22 for centering the upper end of the compression spring 22.
  • the pressure adjusting screw 34 is screwed into a thread arranged in a housing projection 44.
  • a piston can be provided instead of the membrane 12, which can be acted upon by the pressure of the medium to be measured against the force of the compression spring 22.
  • a plurality of switching contacts can also be provided, which switch either simultaneously or at different pressures.
  • the switch contacts can be designed as change-over switches, openers or closers.
  • FIG. 2 shows a detail from FIG. 1 on a larger scale.
  • FIG. 2 shows the shape of the bimetallic disks 36, which are curved like a plate spring, and their arrangement.
  • FIG. 2 shows the bimetal discs: 36 in the normal position, the effect of the bimetal discs 36 at an elevated ambient temperature can be seen from the right half of this figure.
  • the bimetallic disks 36 are curved more strongly.
  • bimetal disks can be added or removed. Due to the alternating arrangement of the bimetallic disks 36, the compensation stroke increases by each added bimetallic disk.
  • slightly curved, round perforated disks are preferred as bimetallic disks.
  • the bimetallic element 38 formed by the bimetallic disks 36 serves as an axially movable support for the compression spring 22.
  • FIG. 3 shows, as a variant of FIG. 1, a measuring transducer 46 which emits a continuous signal depending on the approach of a tongue 48.
  • a transmitter preferably has electronic components and can, for example, inductively, capacitively or optically sense the approach of the tongue 48.
  • the tongue 48 is arranged instead of the leaf spring 18 shown in FIG. 1 and acts in the same way as the leaf spring 18 as an actuating element.
  • bimetal perforated disks lined up on the mandrel 40 it is also possible to use bimetal disks without a hole, which must be lined up in a sleeve. It is also possible to use perforated bimetal strips instead of round bimetal discs, which are lined up on a mandrel and insured against rotation.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Fluid Pressure (AREA)
EP19850109478 1984-08-15 1985-07-27 Organe presseur pour interrupteur ou régulateur de pression Expired EP0173090B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3913/84 1984-08-15
CH391384A CH664220A5 (de) 1984-08-15 1984-08-15 Druckgeber fuer einen druckschalter oder einen regler.

Publications (2)

Publication Number Publication Date
EP0173090A1 true EP0173090A1 (fr) 1986-03-05
EP0173090B1 EP0173090B1 (fr) 1988-05-25

Family

ID=4266191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850109478 Expired EP0173090B1 (fr) 1984-08-15 1985-07-27 Organe presseur pour interrupteur ou régulateur de pression

Country Status (3)

Country Link
EP (1) EP0173090B1 (fr)
CH (1) CH664220A5 (fr)
DE (1) DE3562961D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0423462A1 (fr) * 1989-10-14 1991-04-24 WABCO GmbH Dispositif de surveillance de l'étanchéité d'un pneu
CN110391110A (zh) * 2019-09-04 2019-10-29 济南迈克阀门科技有限公司 一种消防用双输出式可调压压力开关
CN114659698A (zh) * 2022-03-06 2022-06-24 淮安市格洋浩瑞电子科技有限公司 一种抗冲击高稳定平膜型压力传感器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112652503A (zh) * 2019-10-10 2021-04-13 侯耀淞 压差开关

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2514881A (en) * 1947-05-23 1950-07-11 United Electric Controls Co Thermostatic switch
US2635157A (en) * 1949-05-03 1953-04-14 Rheostatic Co Ltd Thermostatic control switch
CH315978A (de) * 1952-08-04 1956-09-15 Buerkert Christian Elektrothermisch betätigte, stetig arbeitende Verstelleinrichtung
FR1357961A (fr) * 1962-06-02 1964-04-10 Danfoss As Perfectionnements apportés aux appareils \thermostatiques
CH528142A (de) * 1971-02-24 1972-09-15 Bbc Brown Boveri & Cie Druckabhängiger temperaturkompensierter Schalter
FR2261608A1 (fr) * 1974-02-15 1975-09-12 Vdo Schindling

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2514881A (en) * 1947-05-23 1950-07-11 United Electric Controls Co Thermostatic switch
US2635157A (en) * 1949-05-03 1953-04-14 Rheostatic Co Ltd Thermostatic control switch
CH315978A (de) * 1952-08-04 1956-09-15 Buerkert Christian Elektrothermisch betätigte, stetig arbeitende Verstelleinrichtung
FR1357961A (fr) * 1962-06-02 1964-04-10 Danfoss As Perfectionnements apportés aux appareils \thermostatiques
CH528142A (de) * 1971-02-24 1972-09-15 Bbc Brown Boveri & Cie Druckabhängiger temperaturkompensierter Schalter
FR2261608A1 (fr) * 1974-02-15 1975-09-12 Vdo Schindling

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0423462A1 (fr) * 1989-10-14 1991-04-24 WABCO GmbH Dispositif de surveillance de l'étanchéité d'un pneu
CN110391110A (zh) * 2019-09-04 2019-10-29 济南迈克阀门科技有限公司 一种消防用双输出式可调压压力开关
CN110391110B (zh) * 2019-09-04 2024-04-26 济南迈克阀门科技有限公司 一种消防用双输出式可调压压力开关
CN114659698A (zh) * 2022-03-06 2022-06-24 淮安市格洋浩瑞电子科技有限公司 一种抗冲击高稳定平膜型压力传感器
CN114659698B (zh) * 2022-03-06 2024-04-09 淮安市格洋浩瑞电子科技有限公司 一种抗冲击高稳定平膜型压力传感器

Also Published As

Publication number Publication date
CH664220A5 (de) 1988-02-15
DE3562961D1 (en) 1988-06-30
EP0173090B1 (fr) 1988-05-25

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