EP3227642A1 - Dispositif de détection - Google Patents

Dispositif de détection

Info

Publication number
EP3227642A1
EP3227642A1 EP15800772.4A EP15800772A EP3227642A1 EP 3227642 A1 EP3227642 A1 EP 3227642A1 EP 15800772 A EP15800772 A EP 15800772A EP 3227642 A1 EP3227642 A1 EP 3227642A1
Authority
EP
European Patent Office
Prior art keywords
housing
sensor
arrangement according
sensor arrangement
absorption body
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.)
Withdrawn
Application number
EP15800772.4A
Other languages
German (de)
English (en)
Inventor
Kjeld Winther Jacobsen
John B. Jacobsen
Mikkel HAUGAARD
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.)
Grundfos Holdings AS
Original Assignee
Grundfos Holdings AS
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 Grundfos Holdings AS filed Critical Grundfos Holdings AS
Publication of EP3227642A1 publication Critical patent/EP3227642A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/245—Housings for sensors
    • 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
    • G—PHYSICS
    • G12—INSTRUMENT DETAILS
    • G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G12B9/00—Housing or supporting of instruments or other apparatus
    • G12B9/02—Casings; Housings; Cabinets
    • G12B9/04—Details, e.g. cover
    • 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
    • G01L13/025—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements using diaphragms

Definitions

  • the invention relates to a sensor arrangement with the features specified in the preamble of claim 1.
  • Such sensor arrangements belong to the state of the art and have one or more sensors, which are arranged in a housing which consists of at least one plastic injection-molded part.
  • the sensor is connected either directly or via sensor electronics located in the housing to at least one conductor which is to be guided sealingly through the housing.
  • Cable bushings are state of the art and, depending on the design, are of different complexity but also of different density. While for larger housings for electrical devices a sealed cable gland is one of the prior art, which is again solvable, such a seal for the usually relatively small sensor housing is not suitable.
  • the invention has the object to improve a generic sensor arrangement to the effect that on the one hand the housing is better sealed against the ingress of liquid, on the other hand, the conductor feedthrough in the housing is structurally simple and inexpensive.
  • the penetrating liquid to be bound to obtain the longest possible life of the sensor assembly.
  • the term "sensor” is to be understood as the part of the sensor arrangement via which the variable to be measured is detected, ie the actual electronic and / or mechanical element whose change is detected and whose signal is actively or passively processed by means of sensor electronics becomes.
  • a sensor can be formed for example by a thermocouple, by a strain gauge or other known sensor elements.
  • the sensor arrangement according to the invention has at least one sensor, which is arranged in or on a housing which consists of plastic and is constructed from at least one plastic injection-molded part. At least one electrical conductor is guided through the housing in a sealing manner and is electrically conductively connected to the sensor or any sensor electronics present in the housing. According to the invention, the seal between the housing and conductor is formed by an O-ring.
  • the basic idea of the sensor arrangement according to the invention is not, as in the state of the art, to insert a cable sealingly into the housing or to directly encase the conductor leading into the housing with plastic, but to guide each conductor individually by means of an O-ring relative to the housing, ie the housing leadthrough seal in order to produce a reliable and long-term stable seal between the conductor and housing in this way, regardless of the further sheath.
  • a seal is structurally simple, cost-effective ⁇ ig in the production and assembly as well as long-term stability. It reliably prevents moisture between sheath and conductor can penetrate into the housing, as is the case in the prior art.
  • This sealing of the conductor itself with respect to the housing forms the basis for a long-time-tight conductor feedthrough.
  • a recess is provided in the housing, which is provided for the implementation of a conductor and in which the O-ring comes to rest, which sits on the recess passing through the head.
  • This is a classic seal between two surfaces by means of an O-ring.
  • the O-ring is thereby arranged in a circumferential groove of the conductor so as to ensure a defined position and to facilitate the assembly by the O-ring is pushed onto the conductor before assembly and held back springing within the groove.
  • the housing of the sensor arrangement according to the invention advantageously consists of at least two housing parts, which are each formed of non-material injection molding, wherein within the housing advantageously at least a part of the sensor electronics is located.
  • the two-part design simplifies installation, allows reopening of the housing in the event of a repair, and ensures that it can be re-opened the sealing conductor bushing can be made substantially independent of the remaining assembly steps.
  • At least one absorption body for receiving and binding moisture which has a defined spatial form, is arranged inside the housing according to a development of the invention and which is designed as a plastic injection molded part, that is defined within the housing and how a solid can be mounted.
  • Absorbent body in the sense of the invention is to be understood as meaning a body which can bind water and / or moisture permanently.
  • the plastic can absorb at least 0.5 percent by mass of water and / or at least 0.2 percent by mass of moisture, preferably more than 5 percent by mass of water and / or more than 2 percent by mass of moisture.
  • plastics known that are predestined for this purpose it is advantageous to use polyoxymethylene, polyethersulfone, acrylonitrile-butadiene-styrene or preferably polyamide.
  • Moisture in the sense of the invention is to be understood as meaning not only water but also any other liquid which is to be bound in such a housing, such as alcohol or gasoline, depending on which liquid environment the sensor arrangement is intended for. It is understood that the absorbent body is adapted to bond this liquid accordingly. Also, absorption bodies for different liquids can be provided in a housing.
  • O-rings are standard components that are available at low cost and ensure high tightness. If the housing is made up of more than two housing parts, it is advantageous to seal all housing parts to each other via O-rings.
  • a particularly advantageous sensor arrangement is obtained when the housing has an at least partially tubular housing part and a lid which terminates at one end.
  • This cover is then advantageously connected by incorporation of an O-ring with the other housing part.
  • the tubular portion in the region in which the seal is incorporated advantageously circular, but not necessarily.
  • the O-ring can also follow an oval or other housing contour, which may be predetermined or advantageous for example in view of the installation situation of the sensor arrangement in a device.
  • the at least one electrical conductor is guided through a housing part, preferably the cover of the housing.
  • all cable bushings are in only one housing part, since then only one housing part with the necessary for the conductor bushing manufacturing and assembly steps is to occupy.
  • the sealing of the conductor relative to the housing part takes place according to the invention by an O-ring.
  • the conductor or each conductor is connected according to an advantageous development of the invention on its housing-side electrically conductive to a line, said cable connection advantageously coated with an electrically insulating shrink tube and then with plastic is overmoulded. If here, which is usually the case, several conductors are arranged, it is understood that these are each coated after completion of the electrical connection each with a shrink tube and then encapsulated with plastic.
  • the electrical connection is advantageously carried out by soldering, but can also be done by welding or by a clamp connection.
  • the conductors with the O-rings mounted thereon are arranged in the corresponding recesses in the cover or, if appropriate, in another housing part, after which the electrical connections are made, the heat-shrink tubings are attached and finally the line connection formed in this way is encapsulated with plastic so as to be firmly and permanently connected to the lid or the corresponding housing part.
  • the lid is plug-shaped and one of the end face of the tubular housing part overlap Having the cover part, which closes with this housing part and having a stepped plug-shaped cover part which engages in the rohrformigen housing part.
  • an O-ring is arranged between the stepped cover part and the inner side of the tubular housing part.
  • the cover distal end of the rohrformigen housing part is formed into a point in which the sensor is arranged.
  • the sensor is arranged in the tip at one end of the rohrformigen housing part and at the other end of the lid, which has the electrical line feedthroughs.
  • the sensor electronics are advantageously arranged at least partially on a printed circuit board which passes through the rohrformigen housing part longitudinally and carries at one end the sensor or sensors and is connected at the other end to the guided through the housing cover conductors and carries the corresponding line contacts.
  • the absorption body of the inner contour of the housing adapted and arranged by means of spacers at a distance from the housing wall according to a development. These spacers prevent on the one hand, that the absorption body rests against the housing wall, so that a certain circulation and thus also distribution of the moisture is possible around the absorption body.
  • the spacers are important, so that a certain amount of free space remains between the absorption body and the housing wall, which the absorption body requires in order to be able to expand correspondingly upon absorption of moisture.
  • the spacers are advantageously part of the absorption body and preferably formed by projecting from the absorption body laterally projecting spring tongues, which are supported in the installed position on the housing wall and thus hold the absorption body at a distance from the housing wall within the housing.
  • the absorption body has a central and in cross-section substantially rectangular recess which is provided for receiving the printed circuit board.
  • the recess is designed so that the circuit board passes through the absorption body longitudinally, but is spaced therefrom.
  • positive locking means are advantageously provided between these components, which unambiguously determine their arrangement with respect to one another.
  • positive engagement means are provided between the housing cover and the absorption body, which unambiguously determine their arrangement with respect to one another.
  • the absorption body can advantageously limit the space for receiving the O-ring between the tubular housing part and the lid on one side, so that on the housing components virtually no special embodiments for receiving the O-ring are required, as shown in detail below the construction ,
  • the housing in the region of the sensor has an opening and the sensor is sealed by means of an O-ring in the region of the opening relative to the housing. Also in this area, the O-ring is a simple, easy-to-install and cost-effective and long-term stable seal.
  • the senor as for example when used in circulation pumps, especially heating circulation pumps, but also in other areas as a differential pressure sensor, then two openings are provided on opposite sides of the sensor in the housing in the region of the sensor, wherein advantageously each of these openings by means of a O-ring is sealed against the sensor.
  • FIG. 2 shows the sensor arrangement according to FIG. 1 after a first assembly step
  • FIG. 3 shows the sensor arrangement according to FIG. 1 after a second assembly step
  • FIG. 4 shows a view of the components of the sensor arrangement according to FIG. 1
  • FIG. 5 shows a longitudinal section through the components according to FIG. 4,
  • FIG. 6 shows a longitudinal section through the assembled sensor arrangement
  • Fig. 7 shows an enlarged view of the detail VII of Fig. 6 and
  • the illustrated with the figures sensor assembly comprises a housing 1, which is formed from a tubular housing part 2 and a de- ekel 3.
  • a housing 1 which is formed from a tubular housing part 2 and a de- ekel 3.
  • an absorption body 4 and a circuit board 5 are arranged.
  • the board 5 carries the sensor electronics and is provided at one end with electrical contacts 6 for electrical connection and at the other end with the actual sensor 7, which is a differential pressure sensor.
  • the housings 2 and 3 are designed as plastic injection-molded parts, as is the absorption body 4, which is provided for receiving liquid, in this case water.
  • the absorbent body 4 binds this inside the fabric. Housing 1 water or moisture, so as to protect the electronic components arranged on the board 5 from moisture.
  • the housing part 2 has a tubular section 8, which essentially has a hollow cylindrical shape and is formed at one axial end (in FIGS. 4, 5 and 6 at the right end) for receiving the cover 3 and at the other axial end a tip 9 is formed, which is likewise designed as a hollow body and at two 180 ° facing away from each other flat sides each with a recess 10 and 1 1 is provided.
  • the sensor 7, which is acted upon as a differential pressure sensor from two sides and connected to the respective fluid whose pressure is to be detected.
  • the illustrated sensor arrangement is intended for incorporation into a corresponding recess in a pump housing, as is known from EP 2 626 567 A1, for example, from the prior art.
  • the tip 9 is seated within a soft elastic sealing sleeve 12 which surrounds the tip and in alignment with the recesses 10 and 1 1 recesses 13 and 14 which lead to corresponding channels in the pump housing.
  • the collar is formed into a sealing ring 15, which axially adjoins the sealing collar 12 and is arranged on a shoulder 16 of the tubular housing part 2 between the tubular portion 8 and the tip 9.
  • a spacer body 18 which consists of soft elastic material, the board 5 at her surmounted tip-side end and the space between the tip-side end of the board 5 and the cavity within the housing tip 9 fills and thus determines the axial position of the board 5.
  • This spacer 18 is within the housing part 2 approximately in the area in which the sealing ring 15 comes to rest outside, and has in alignment with the sensor 7 and the recess 1 1, a recess 19 which as well as the recess 17 in the circuit board circumferentially supports an O-ring 20, the one side is supported by the sensor 7 and on the other side by a wall of the housing part 2.
  • the board 5 is received in a recess 21 passing through the essentially cylindrical absorption body 4.
  • the absorption body 4 is substantially adapted to the inner contour of the tubular housing part 2 in this area. He has three circumferentially uniformly distributed projections 22 in the form of tongues as spacers, which project obliquely backwards, ie in the direction of the connection-side end and radially outwards and ensure that the absorption body 4 with a radial distance within the tubular Housing part 2 is applied.
  • the board 5 is located at a small distance within the recess 21 and on the other side with a much greater distance to a space for the board 5 located on the electronic construction - to form parts.
  • an obliquely inwardly projecting towards the inside and the connection end end spring tongue 23 is formed in the absorption body 4, which ensures that after connecting absorption body 4 and board 5, as shown in Fig. 2, these components remain connected , so they can be handled like a component during assembly.
  • the spring tongue 23 engages behind a projection 24 on the board 5, which serves to lead out the electrical contacts.
  • the lid 3 is plug-shaped and has an annular portion 25 which projects inwardly into the rohrformigen section 8 of the housing part 2 and is surrounded by this at a distance (in assembled state, see Fig. 6).
  • This annular portion 25 is radially surmounted by a flange 26, which closes the rohrformigen section 8 end face and rests against this.
  • the inside of this flange 26 and the outside of the annular portion 25 form the lid-side part of a seat for an O-ring 27 which is bounded radially outward by the rohrformigen portion of the housing part 2 and axially by the projections 22 of the absorbent body 4.
  • the O-ring 27 seals the housing parts 2 and 3 from each other.
  • the components are connected by lateral to the flange 26 and extending in the direction of the housing part 2 locking tongues 29 which rust when pushing the housing parts 2 and 3 behind projections 30 on the outside of the housing part 2 and thus firmly connect the components together.
  • the housing part 2 and 3 can thus be permanently connected to each other by simply plugging together, as can be seen in particular from FIG. 3.
  • the absorption body 4 at its end facing the cover has, in addition to the contacts 6, a projection 31 which, when the board 5 enters the recess 21 is incorporated in the absorption body 4, is received in a correspondingly formed blind hole on the inside of the lid 3. Since the projection 31 in the absorption body 4 and the corresponding blind hole-shaped recess in the lid 3 are asymmetrically arranged and formed with respect to the longitudinal central axis, an assembly of these components is possible only in the intended position.
  • the sensor assembly is wired in the illustrated embodiment, ie, the contacts 6 are connected via electrical conductors 32 which are guided through the cover 3, with conductors of a cable 23, via which the sensor arrangement is signal-connected and electrically connected.
  • a wireless electrical supply for example, be provided inductively.
  • the signal connection can then be made via radio (WLAN, Bluetooth or the like).
  • the electrical conductors 32 are made of metal and each have a sleeve-like in the housing interior facing part 34, which is provided for receiving a contact 6 and for electrical connection thereto.
  • the sleeve-like part 34 of each conductor 32 is formed on the outside cylindrical and provided with a circumferential groove 35 which is provided for receiving an O-ring 36. Beyond the groove 35 and in the region of the groove 35, the conductor is solid and circular in cross-section and continued in a pin-like manner.
  • This pin-like part 37 passes through the cover 3 and is continued on the outside, where the corresponding conductor of the cable 33 is connected to this part 37 by soldering. Beyond the cover 3, the part 37 of the electrical conductor 32 and the soldered conductor of the cable 33 is electrically insulated by a shrink tube to the outside. All conductors are then plastic encapsulated, such that this is a strain relief 38 for the cable 33 forming plastic part molded on the cover 3 including all the conductors form fit.
  • cylindrical stepped recesses 39 are provided inside the cover 3, parallel to the longitudinal axis, which have an outwardly tapered section 40 and which each have an electrical conductor 32 under inclusion of the O-ring in the groove 35 36 record sealing.
  • the electrical conductor 32 is inserted from the inside of the cover in the recess 39, wherein the tapered portion to serves to guide the conductor 32 with the O-ring 36 in the intended position, in which the conductor 32 is held in a form-fitting manner axially outwardly through the stepped recess and the O-ring 36 sealingly abuts between the recess 39 and the conductor 32.
  • the lid 3 forming plastic injection molded part is fitted by the interior of the housing facing side in the recesses 39 with the conductors 32 by these provided with O-ring 36 conductors 32 are inserted axially into the corresponding recesses 39 until they are within the appropriate gradation within the recess 39 abut. Then the conductors of the cable 33 are soldered, the shrink tubing, which have been previously pulled over the cable ends, shrunk by heat, after which the strain relief 38 is encapsulated and thus the cover 3 is firmly and permanently connected to the cable 33 and the electrical connections to Cable has.
  • the board 5 which is provided with the spacer body 18 and equipped with the O-rings 20, inserted into the recess 21 of the absorbent body 3, with the contacts 6 in advance, until the spring tongue 23 springs back behind the projection 24 and so that the board 5 and absorption body 4 connects to each other.
  • the housing parts 3 and 4 are still the housing parts 3 and 4 to be connected by plugging together, whereby ensured by the projection 31 is that the connection is made so that the contacts 6 in the designated socket-like parts of the electrical conductors 32 come into engagement and the cover 6 is firmly and tightly connected to the housing part 2 by incorporation of the O-ring 27.
  • the connection is secured by the locking tongues 29, which then grip behind the projections 30 on the housing part 2 and thus hold the sensor arrangement in the intended assembly position so that the housing 1 is sealed to the board 5 located therein to the outside.
  • the absorption body 4 is arranged at a distance from the circuit board 5 and from the housing wall, so that it can expand and thus also absorb moisture when absorbing liquid which can diffuse through the housing or otherwise reach it.
  • All seals of the sensor arrangement according to the invention are formed by O-rings, which is particularly advantageous because they are inexpensive to manufacture, easy to install and have a high static sealing effect over a long time.
  • the O-ring assembly allows easy replacement of the seals.
  • the sensor assembly thus formed is then inserted under inclusion of the sealing sleeve 12 in the recess provided in the pump housing and secured by a circumferential groove 41 on the outside of the housing part 2 in this position by means of a corresponding bracket.

Landscapes

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

Abstract

L'invention concerne un dispositif de détection qui comporte un capteur disposé dans un boîtier constitué de deux éléments moulés par injection de matière plastique (2, 3). Les conducteurs électriques, qui traversent de manière étanche le boîtier (1), sont rendus étanches au moyen de joints toriques qui reposent d'une part dans une rainure du conducteur et d'autre part dans un évidement formant une traversée de boîtier.
EP15800772.4A 2014-12-03 2015-11-24 Dispositif de détection Withdrawn EP3227642A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14196095 2014-12-03
PCT/EP2015/077413 WO2016087256A1 (fr) 2014-12-03 2015-11-24 Dispositif de détection

Publications (1)

Publication Number Publication Date
EP3227642A1 true EP3227642A1 (fr) 2017-10-11

Family

ID=52003631

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15800772.4A Withdrawn EP3227642A1 (fr) 2014-12-03 2015-11-24 Dispositif de détection

Country Status (5)

Country Link
US (1) US10288457B2 (fr)
EP (1) EP3227642A1 (fr)
CN (1) CN107003158A (fr)
RU (1) RU2017119006A (fr)
WO (1) WO2016087256A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP6718855B2 (ja) * 2017-11-30 2020-07-08 株式会社鷺宮製作所 圧力センサのシールド構造、および、それを備える圧力センサ
WO2019166605A1 (fr) * 2018-03-02 2019-09-06 Grundfos Holding A/S Capteur de pression
DE102018206210A1 (de) * 2018-04-23 2019-10-24 Continental Automotive Gmbh Deckelanordnung für einen Sensor sowie Fußgängerschutzsensor für ein Fahrzeug
CN108801315A (zh) * 2018-06-29 2018-11-13 池州市清心信息技术服务有限公司 一种基于传感器的高安全性保护装置
DE202019004415U1 (de) * 2019-10-28 2019-11-06 K.W.H. Ciclosport Vertriebs GmbH Sensorvorrichtung

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Also Published As

Publication number Publication date
CN107003158A (zh) 2017-08-01
RU2017119006A3 (fr) 2019-01-09
WO2016087256A1 (fr) 2016-06-09
US20170328747A1 (en) 2017-11-16
US10288457B2 (en) 2019-05-14
RU2017119006A (ru) 2019-01-09

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