EP0336805A1 - Hochdruckschalter - Google Patents

Hochdruckschalter Download PDF

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Publication number
EP0336805A1
EP0336805A1 EP89400758A EP89400758A EP0336805A1 EP 0336805 A1 EP0336805 A1 EP 0336805A1 EP 89400758 A EP89400758 A EP 89400758A EP 89400758 A EP89400758 A EP 89400758A EP 0336805 A1 EP0336805 A1 EP 0336805A1
Authority
EP
European Patent Office
Prior art keywords
contactor
piston
electrical
contactor according
elastic blade
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
EP89400758A
Other languages
English (en)
French (fr)
Other versions
EP0336805B1 (de
Inventor
Georges Dumoulin
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.)
Jaeger SA
Original Assignee
Jaeger SA
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 Jaeger SA filed Critical Jaeger SA
Publication of EP0336805A1 publication Critical patent/EP0336805A1/de
Application granted granted Critical
Publication of EP0336805B1 publication Critical patent/EP0336805B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder

Definitions

  • the present invention relates to the field of electrical contactors sensitive to pressure.
  • the control module generally comprises a membrane subjected to the pressure to be checked, a coil return spring which biases the membrane against said pressure and transforms the pressure into displacement, and means associated with the membrane which act on the movable contact of the contact module, when the pressure to be checked exceeds a determined threshold.
  • an electrical pressure-sensitive contactor comprising a body which houses a contact module provided with at least one movable electrical contact formed by an elastic blade of electrically conductive material and a control module comprising a piston subjected to the pressure to be detected and guided in translation in the body of the contactor, in which the return member controlling the movements of the movable contact and of the piston is constituted by the elastic blade itself.
  • the piston is made of elastic elastomeric material.
  • the elastic blade extends perpendicular to the direction of translation of the piston.
  • the conventional contactors hitherto proposed generally do not withstand pressures greater than 25 bars. Beyond these pressures, the membrane or the elastic piston is damaged.
  • DE-B-2 547 257 has also described an electrical contactor comprising an elastic blade cooperating with an actuating membrane which is transverse to it.
  • the elastic blade is anchored at its ends in a fixed support, on the one hand, and in a support integral with the membrane, on the other hand.
  • the device described in this document has a sudden tilting operation and cannot be used for pressure detection.
  • the object of the present invention is to eliminate the drawbacks of the prior devices.
  • the object of the present invention is in particular to propose an electrical contactor adapted to detect without damage pressures exceeding 100 bars, and to tolerate overpressures of 650 bars minimum.
  • an electrical contactor sensitive to pressure of the type known per se comprising a body which houses a contact module provided with at least one movable electrical contact formed by an elastic blade in electrically conductive material and a control module comprising a piston subjected to the pressure to be detected and guided in translation in the body of the contactor, in which the return member controlling the movements of the movable contact and of the piston is constituted by the elastic blade it - itself, characterized by the fact that: - the piston subjected to the pressure to be detected is rigid, the mean plane of the elastic blade extends parallel to the direction of translation of the piston, and - The elastic blade bears, on the one hand, by a first end against the piston, on the other hand, by a second end on a stopper linked to the body of the contactor so that the elastic blade is curved and armed at rest.
  • the present invention finds particular, but not exclusively, application in the pressure control of braking circuits or suspensions of a motor vehicle.
  • FIG. 1 shows, in a view in longitudinal axial section, an electrical contactor in accordance with the present invention.
  • the body of the contactor illustrated in the appended figure is referenced 10. It has an axis of symmetry 11.
  • the body 10 defines an internal chamber 12 capable of receiving the contact module 100 which will be defined in more detail below, and a piston rigid control 200.
  • Room 12 is blind. It opens axially at a first end 13 of the body. However, a cylindrical bore 14 centered on the axis 11 is formed at the second end 15 of the body 10 to connect the bottom of the chamber 12 to the outside.
  • the chamber 12 is delimited by two cylindrical portions 16, 17, juxtaposed axially.
  • the cylindrical portion 16 of a smaller diameter forms the bottom of the internal chamber 12. It is adjacent to the second end 15 of the body 10. The above-mentioned bore 14 opens into this portion 16.
  • the front end 18 adjacent to the first end 13 of the body 10) of the second cylindrical portion 17 of larger diameter is tapped. It receives a ring 110 having a complementary external thread 111.
  • the ring 110 serves as a support for a washer 120 placed inside the second portion 17 of the chamber 12.
  • the washer 120 itself serves to support a sleeve 130 placed in the cylindrical portion 17, that is to say between the washer 120 and the first cylindrical portion 16.
  • a strip 140 made of electrically conductive material passes through the washer 120.
  • the strip 140 extends parallel to the axis 11 but is offset relative to the latter inside the chamber 12.
  • the end 141 of the strip 140 carries a contact pad 142.
  • the stud 142 is formed by a screw engaged by thread in the strip 140.
  • the axis 143 of the screw 142 extends transversely to the axis 11.
  • the thread engagement of the stud 142 in the strip 140 makes it possible to adjust the radial position of the stud 142.
  • the stud 142 is positioned on the strip 140 so that its radially innermost point 144 coincides with the axis 11.
  • the adjustment of the stud 142 on the strip 140 can be operated from the outside after assembly of the contactor, thanks to an opening 19 made in the side wall of the body 10, opposite the screw 142.
  • An annular recess 20 is formed between the cylindrical portions 16 and 17. The recess 20 is directed towards the first end 13 of the body 10.
  • the sleeve 130 defines an internal flaring 131 near the recess 20.
  • the internal diameter of the channel 132 defined at the level of the internal flaring is less than the diameter of the first cylindrical portion 16.
  • the internal flaring 131 defines an annular bearing 133 centered on the axis 11 and directed towards the bottom of the chamber 12, that is to say towards the second end 15 of the body.
  • An annular seal 134 rests against the bearing surface 133.
  • the piston 200 is engaged in the first cylindrical portion 16 of the chamber 12.
  • the piston 200 is formed of a cylindrical body centered on the axis 11 and having a diameter substantially equal, while being very slightly smaller, to the diameter of the first cylindrical portion 16 of the chamber 12.
  • the piston 200 is guided in translation parallel to the axis 11 in the chamber 12.
  • the piston 200 is provided, substantially at mid -length, an annular groove 202. This receives an annular seal 204.
  • the seal 204 preferably has a cross section in X. It rests against the cylindrical portion 16 of the chamber 12 and provides sealing between the piston 200 and the body 10.
  • the piston 200 receives the pressure applied to the bore 14 on its surface 206 transverse to the axis 11 and directed towards the second end 15 of the body.
  • the pressure applied to the bore 14 therefore tends to move the piston 200 towards the first end 13 of the body.
  • the piston 200 is biased towards the second end 15 of the body by a blade 150.
  • the latter is supported, on the one hand, by a first end 151 on the piston 200 and, on the other hand, by a second end 152 on the washer 120.
  • the piston 200 is provided on its second face 208 transverse to the axis 11 and directed towards the first end 13 of the body, with a slot 209. This is oriented diametrically relative to the axis 11. It has a width substantially equal to the thickness of the blade 150 to freely receive the aforementioned end 151 of the latter.
  • the washer 120 is provided on its face 121 directed towards the piston 200, with a slot 122 oriented diametrically relative to the axis 11 and designed to freely receive the second end 152 of the blade 150.
  • the blade 150 is slightly bent at rest. Its mean plane defined at mid-thickness of the ends 151, 152, is advantageously intersecting with the axis 11.
  • the blade 150 is made of an electrically conductive elastic material, with a neighboring thermoelastic temperature coefficient from zero.
  • the blade 150 can be formed for example of an alloy of nickel and chromium, such as the material sold under the name "DURINVAL" by the company METALIMPHY.
  • the blade 150 may be formed from a blistering blade.
  • the contactor further comprises a cap 160 set on the first end 13 of the body 10.
  • the cap 160 carries a connection blade 161 electrically connected to the strip 140.
  • the stud 142 fixed on the strip 140 is placed substantially opposite the center of the strip 150.
  • the two electrical contacts of the contact module 100 integrated into the contactor shown in the appended figure are formed one by the stud 142 associated with the strip 140, the other by the movable blade 150 also serving as a return member.
  • the two contactor output terminals are formed, however, one by the blade 161 carried by the cap 160, the other by the body 10 of the contactor itself.
  • a direct electrical connection is defined, for example, by welding or any other equivalent means between the output blade 161 and the internal strip 140.
  • the body 10 of the contactor must be made of an electrically conductive material, preferably metal.
  • the electrical connection between the body 10 and the blade 150 is ensured by the piston 200.
  • This must therefore also be made of an electrically conductive material, preferably metal.
  • the washer 120 must not electrically connect the strip 140 and the blade 150.
  • the washer 120 can be formed from electrically insulating material.
  • the strip 140 can pass through the washer 120 without contact with the latter.
  • the blade 150 rests against the stud 142 in the rest position, that is to say when no high pressure is applied to the bore 14.
  • the piston 200 When, on the other hand, the high pressure to be detected is applied to the face 206 of the piston via the bore 14, the piston 200 axially compresses the blade 50 which works in buckling.
  • the deformation in the radial direction of the blade 150 modifies the state of connection between the stud 142 and the blade 150. It will in fact be noted that when the pressure applied to the bore 14 pushes the piston 200 towards the washer 120, the radius curvature of the central curved part of the blade 150 tends to decrease.
  • the contact is interrupted between the stud 142 and the blade 150.
  • Such a type contactor is generally called downward contactor, insofar as the electrical contact closes when the pressure applied to the bore 14 is less than the threshold pressure to be detected.
  • the electrical contactor can constitute an upward contactor, having an electrical contact between the stud 142 and the blade 150 which closes when the pressure applied to bore 14 is greater than the threshold pressure to be detected.
  • the nominal winding of the blade 150 which determines the restoring force exerted on the piston 200 can be controlled by axial adjustment of the ring 110 serving to support the washer 120.
  • the pressure setting determining the change of state of the contactor is operated by axial adjustment of this ring 110, in combination with the adjustment in position of the stud 142 on the strip 140.
  • the washer 120 which serves as a stop linked to the body 10 for the blade 150 is adjustable parallel to the direction of movement of the rigid piston.
  • seal 202 seals the contactor, that is to say between the piston 200 urged by the pressurized fluid and the body 10, within the normal operating range.
  • the piston 200 comes to rest against the annular seal 134 which has the general shape of a flat washer transverse to the axis 11 and centered on it.
  • the seal 134 guarantees the tightness of the contactor whatever the pressure applied to the bore 14.
  • the seal 134 is glued against the bearing surface 133 of the sleeve 130.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
EP19890400758 1988-03-18 1989-03-17 Hochdruckschalter Expired - Lifetime EP0336805B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8803532 1988-03-18
FR8803532A FR2628888B1 (fr) 1988-03-18 1988-03-18 Contacteur haute pression perfectionne

Publications (2)

Publication Number Publication Date
EP0336805A1 true EP0336805A1 (de) 1989-10-11
EP0336805B1 EP0336805B1 (de) 1993-06-23

Family

ID=9364397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890400758 Expired - Lifetime EP0336805B1 (de) 1988-03-18 1989-03-17 Hochdruckschalter

Country Status (3)

Country Link
EP (1) EP0336805B1 (de)
DE (1) DE68907250T2 (de)
FR (1) FR2628888B1 (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE918577C (de) * 1951-04-29 1954-09-30 Standard Elek Zitaets Ges Ag Schalter
US2851565A (en) * 1956-10-15 1958-09-09 Pratt & Whitney Co Inc Pressure responsive switch
CH352025A (fr) * 1959-03-09 1961-02-15 Hydro Mecanique De Precision S Interrupteur manométrique
US3418001A (en) * 1967-11-01 1968-12-24 Minnesota Rubber Co Fluid seal
US3501959A (en) * 1969-02-11 1970-03-24 Stewart Warner Corp Pressure sensing apparatus
US3631389A (en) * 1970-04-17 1971-12-28 Gen Motors Corp Brake system condition warning system and switch assembly therefor
US3939316A (en) * 1973-10-19 1976-02-17 Stropkay Edward J Panic stoplight system for automobiles using a fluid pressure switching device
DE2547257B2 (de) * 1975-10-22 1977-08-18 Roth, Michael; Roth geb. Werner, Veronika; 5060 Bergisch Gladbach Elektrischer schaltkontakt mit extrem kleinem betaetigungsweg

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE918577C (de) * 1951-04-29 1954-09-30 Standard Elek Zitaets Ges Ag Schalter
US2851565A (en) * 1956-10-15 1958-09-09 Pratt & Whitney Co Inc Pressure responsive switch
CH352025A (fr) * 1959-03-09 1961-02-15 Hydro Mecanique De Precision S Interrupteur manométrique
US3418001A (en) * 1967-11-01 1968-12-24 Minnesota Rubber Co Fluid seal
US3501959A (en) * 1969-02-11 1970-03-24 Stewart Warner Corp Pressure sensing apparatus
US3631389A (en) * 1970-04-17 1971-12-28 Gen Motors Corp Brake system condition warning system and switch assembly therefor
US3939316A (en) * 1973-10-19 1976-02-17 Stropkay Edward J Panic stoplight system for automobiles using a fluid pressure switching device
DE2547257B2 (de) * 1975-10-22 1977-08-18 Roth, Michael; Roth geb. Werner, Veronika; 5060 Bergisch Gladbach Elektrischer schaltkontakt mit extrem kleinem betaetigungsweg

Also Published As

Publication number Publication date
FR2628888A1 (fr) 1989-09-22
FR2628888B1 (fr) 1994-04-08
EP0336805B1 (de) 1993-06-23
DE68907250D1 (de) 1993-07-29
DE68907250T2 (de) 1993-09-30

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