GB2201000A - Holder for holding a plate-like thin-film electric resistor - Google Patents

Holder for holding a plate-like thin-film electric resistor Download PDF

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Publication number
GB2201000A
GB2201000A GB08800569A GB8800569A GB2201000A GB 2201000 A GB2201000 A GB 2201000A GB 08800569 A GB08800569 A GB 08800569A GB 8800569 A GB8800569 A GB 8800569A GB 2201000 A GB2201000 A GB 2201000A
Authority
GB
United Kingdom
Prior art keywords
base
holder
thin
plate
resistor
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
GB08800569A
Other versions
GB8800569D0 (en
GB2201000B (en
Inventor
Hans Gerards
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.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of GB8800569D0 publication Critical patent/GB8800569D0/en
Publication of GB2201000A publication Critical patent/GB2201000A/en
Application granted granted Critical
Publication of GB2201000B publication Critical patent/GB2201000B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/688—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element
    • G01F1/69—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element of resistive type
    • G01F1/692—Thin-film arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/01—Mounting; Supporting
    • H01C1/014—Mounting; Supporting the resistor being suspended between and being supported by two supporting sections

Abstract

The invention concerns devices for holding between them a plate-like thin-film electric resistor 2 mounted on a base plate 1. Rectangular parallelepiped holders 4 made of a heat-insulating material, and acting substantially with only point contact on the short edges of the base 1 which supports the resistor 2, have vertical surfaces 7 and V-notches 9 arranged so that the base 1 is self-centering and subjected to longitudinal compressive stress, e.g. from a compression spring or from elastic steel strip retainer brackets 5. Electric leads may be secured between layer 4 and brackets 5. The plate-like thin-film electric resistor 2 supported by the holders 4 can be mounted in the induction pipe of an internal combustion engine and employed for measuring the mass-rate-of-flow of air. <IMAGE>

Description

HOLDER FOR HOLDING A PLATE-LIKE THIN-FILM ELECTRIC RESISTOR This invention concerns a holder for holding a plate-like thin-film electric resistor comprising a thin metal layer applied to a rectangular electrically insulating base. Such thin-film electric resistors are employed particularly for measuring the mass-rate-of-flow of air in the induction pipe of an internal combustion engine.
A device of this kind is known from the German Offenlegungsschrift DE-OS 33 28 853. But in this known device a problem arises in that when it is used in measuring the mass-rate-of-flow af air in the induct ion pipe of an internal combustion engine, heat is lost from the electrically heated resistor not only to the air-stream but also through the base of the resistor to the holder, with the consequence that a false reading of the air-flow is obtained. Furthermore. the holder is fixed to an anchor-plate and, in order to prevent engine vibration from applying bending stresses to the base of resistor. as well as to the electric conductors supplying current, the holder is arranged to apply a compressive stress to the base of the resistor.
The intention of the invention is to thermally insulate the base of the resistor from the holder by appropriate construction of the holder.
The problem is solved in that the holder is a parallelepiped made of heat-insulating material and has a vertical middle-surface in its forward face. towards the base, forming a recess in this face, and two pairs of vertical surfaces, each pairforming an angle with the other pair. extending from the recess out to the side-ends of the holder, the two members of each pair being separated from each other by a horizontal V-notch of constant depth for accomodating the base.
The invention ensures a very rapid establishment of thermal equilibrium in the thin-film resistor. Heat loss to the holder is minimal. Removal of heat form the resistor by the air-stream remains constant over the working life of the device.
An example of the invention will now be described in greater detail with the help of the drawing.
The plate-like thin-film electric resistor comprises a thin metal layer 2 applied to a rectangular base 1. The base 1 is held at each of its two short edges 3 by a holder 4 in the form of a rectangular parallelepiped. Each of the two holders 4, one at each end of the base 1, is supported by a retainer bracket 5 fixed to an anchor plate, which is not shown in the drawing. Of the two holders 4 and retainer brackets 5 only one is shown, for greater clarity in the drawing, the other being a mirror image of the first The holder 4 is made of heat-insulating material and has, in its forward face, towards the base 1 of the resistor, a set-back vertical middle surface 6 forming a recess. From this, two parallel pairs of vertical surfaces 7, each pair forming an angle with the other pair,. extend outwards to the side-ends 8 of the holder 4.The two members of each pair 7 are separated from each other by a horizontal V-notch 9 running parallel to the pair of vertical surfaces 7, the V-notch having a constant depth.
The base 1 of the resistor is held by two corners in the two V-notches 9.
Opposite the set-back middle surface 6 and projecting backwards, away from the base l, is a projection 10 which snaps into engagement with the retainer bracket 5. The retainer bracket 5 is made of elastic steel strip. The two resilient retainer brackets 5, one at each end of the base 1, between them apply a longitudinal compressive stress to the base 1.
If some other arrangement is used, without retainer brackets 5, longitudinal compressive stress can be applied to the base 1 by a compression spring acting behind one of the holders 4.
In this example of the invention electric voltage is applied to the metal layer 2 over electric leads which are not shown in the drawing. Each electric lead is soldered or brazed, at one end, to the metal layer 4 and, at its other end, to the retainer bracket 5. By choosing suitable lengths for the electric leads they can be kept free from tensile stresses and, consequently, are not influenced by thermal expansion of the base 1, or by vibration.
The arrangement of vertical surfaces 7 and V-notches 9 ensures that the base 1 is self-centred between its two holders 4, and the longitudinal compressive stress applied compensates for tolerances in the dimensions of the parts of the device. Furthermore, it will be observed that the base 1 makes practically point-contacts in the V-notches 9, and, consequently, heat loss from the base 1 to the holders 4 is minimal.

Claims (1)

1. A holder for holding a plate-like thin-film electric resistor comprising a thin metal layer mounted on a rectangular electrically insulating base, such resistor being employed in particular for measuring the mass-rate-of-flow of air in the induction pipe of an internal combustion engine, the base being partly surrounded by a holder which applies a longitudinal compressive stress to the base, and wherein he holder (4) is a parallelepiped made of heat-insulating material and has a vertical middle-surface (6) in its forward face, towards the base (1), forming a recess in this face, and two pairs of vertical surfaces (7). each pair forming an angle with the other pair. extending from the recess out to the side-ends (8) of the holder (4), the two members of each pair (7j being separated from each other by a horizontal V-notch (9) of constant depth for accomodating the base (1).
2 A holder for holding a base for a plate-like thin--film electric resistor substantially as hereinbefore described with reference to the accompanying drawing.
GB8800569A 1987-02-12 1988-01-12 Holder for holding a plate-like thin-film electric resistor Expired - Fee Related GB2201000B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873704347 DE3704347A1 (en) 1987-02-12 1987-02-12 DEVICE FOR HOLDING A PLATE-SHAPED ELECTRIC THICK FILM RESISTOR

Publications (3)

Publication Number Publication Date
GB8800569D0 GB8800569D0 (en) 1988-02-10
GB2201000A true GB2201000A (en) 1988-08-17
GB2201000B GB2201000B (en) 1990-10-24

Family

ID=6320821

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8800569A Expired - Fee Related GB2201000B (en) 1987-02-12 1988-01-12 Holder for holding a plate-like thin-film electric resistor

Country Status (4)

Country Link
DE (1) DE3704347A1 (en)
FR (1) FR2611078B1 (en)
GB (1) GB2201000B (en)
IT (1) IT1219796B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995023338A1 (en) * 1994-02-28 1995-08-31 Heraeus Sensor Gmbh Sensor arrangement for a hot-film anemometer
US5841341A (en) * 1996-09-27 1998-11-24 Therm-O-Disc, Incorporated Clip for PTC devices

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3328853C2 (en) * 1983-08-10 1994-07-14 Bosch Gmbh Robert Device for measuring the mass of a flowing medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995023338A1 (en) * 1994-02-28 1995-08-31 Heraeus Sensor Gmbh Sensor arrangement for a hot-film anemometer
US6079265A (en) * 1994-02-28 2000-06-27 Heraeus Electro-Nite International N.V. Method for attaching and insulating resistors
US5841341A (en) * 1996-09-27 1998-11-24 Therm-O-Disc, Incorporated Clip for PTC devices

Also Published As

Publication number Publication date
FR2611078B1 (en) 1992-05-22
GB8800569D0 (en) 1988-02-10
DE3704347A1 (en) 1988-08-25
IT1219796B (en) 1990-05-24
IT8847531A0 (en) 1988-01-14
GB2201000B (en) 1990-10-24
FR2611078A1 (en) 1988-08-19

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940112