DE102022108187A1 - Fixing device and electronic device - Google Patents

Abstract

The invention relates to a fixing device (10) designed for fixing at least one electrical line (2), comprising: - a housing (11) with a first housing part (11.1) and a second housing part (11.2), which form a housing cavity (11.3). , wherein the first housing part and the second housing part each have at least one feedthrough opening (11.4) for passing through at least one of the electrical lines; - an elastic body (12), which is compressed by the first housing part and the second housing part in the assembled state, wherein the elastic body has at least one feed-through channel (12.1) for the at least one electrical line, the elastic body having at least one body cavity (12.2), such as a bore (12.21), in which at least one body cavity each has a support element (13) arranged by means of which at least one support element causes a local stiffening of the elastic body, wherein the at least one support element is designed to bring about a local change in shape, such as a bend, when the first housing part and the second housing part are joined together in at least one electrical line.

Description

The invention relates to a fixing device and an electronic device with such a fixing device.

The technical problem of securing electrical cables has been known for a long time, as shown, for example DD265037A1 a version of a strain relief for a cable bushing.

However, the implementation shown there shows a quite complicated mechanical implementation of strain relief.

It can therefore be seen as the object of the invention to propose a simple and robust fixing device.

The task is solved by a fixing device according to independent claim 1 and by an electronic device according to independent claim 9.

• - ein Gehäuse mit einem ersten Gehäuseteil und einem zweiten Gehäuseteil, welche Gehäuseteile in einem zusammengefügten Zustand einen Gehäusehohlraum ausbilden,

wobei das erste Gehäuseteil und das zweite Gehäuseteil jeweils zumindest eine Durchführungsöffnung zum Durchführen mindestens einer der elektrischen Leitungen aufweisen;

• - einen elastischen Körper, welcher im Gehäusehohlraum angeordnet ist und durch das erste Gehäuseteil und das zweite Gehäuseteil in zusammengefügten Zustand komprimiert wird, wobei der elastische Körper zumindest einen Durchführungskanal für die mindestens eine elektrische Leitung aufweist,

wobei der elastische Körper zumindest einen Körperhohlraum wie beispielsweise eine Bohrung aufweist, in welchem zumindest einen Körperhohlraum jeweils ein Stützelement angeordnet ist, mittels welchem zumindest einen Stützelement eine lokale Versteifung des elastischen Körpers verursacht ist,
wobei das mindestens eine Stützelement dazu eingerichtet ist, bei Zusammenfügen des ersten Gehäuseteils und des zweiten Gehäuseteils bei zumindest einer elektrischen Leitung eine lokale Formänderung wie beispielsweise eine Biegung oder einen Knick zu bewirken.A fixing device according to the invention set up for fixing at least one electrical line, comprises:

• - a housing with a first housing part and a second housing part, which housing parts form a housing cavity in an assembled state,

wherein the first housing part and the second housing part each have at least one feedthrough opening for passing through at least one of the electrical lines;

• - an elastic body which is arranged in the housing cavity and is compressed in the assembled state by the first housing part and the second housing part, the elastic body having at least one feedthrough channel for the at least one electrical line,

wherein the elastic body has at least one body cavity such as a bore, in which at least one body cavity a support element is arranged, by means of which at least one support element causes a local stiffening of the elastic body,
wherein the at least one support element is designed to bring about a local change in shape, such as a bend or a kink, in at least one electrical line when the first housing part and the second housing part are joined together.

By causing a local change in shape, the mechanical resistance of the electrical line in the elastic body is considerably increased, so that good strain relief is provided.

The first housing part and the second housing part can be joined together, for example, via a screw closure or a snap closure.

In one embodiment, several support elements are arranged in the elastic body,
wherein the support elements are designed to bring about several local changes in shape, such as several kinks, in at least one electrical line when the first housing part and the second housing part are joined together.

In one embodiment, the at least one support element can be integrated after production of the elastic body, or the at least one support element is integrated into the elastic body during production of the elastic body.

In one embodiment, the elastic body has a first modulus of elasticity, wherein the at least one support element has a second modulus of elasticity,
wherein the second modulus of elasticity is greater than the first modulus of elasticity by at least a factor of 10 and in particular at least a factor of 50.

It is important that the local stiffening of the elastic body caused by the at least one support element has a higher bending moment than the electrical line to be formed. For example, the bending moment of the local stiffening can be greater than a bending moment of the electrical line by at least a factor of 3.

In one embodiment, the at least one support element has a metal or a plastic. The plastic can be, for example, a polymer or an elastomer.

In one embodiment, the elastic body has a polymer such as silicone, in particular a vinyl-methyl silicone, thermoplastic elastomer or rubber, in particular acrylonitrile-butadiene rubber or ethylene-propylene-diene rubber.

In one embodiment, the elastic body has a greater hardness in a deformation area than outside the contact area.

This can be done, for example, by controlling the polymerization process or by process parameter changes can be achieved in additive manufacturing.

In one embodiment, the fixing device is set up to ensure a minimum pull-off force of 150 Newtons.

• IEC 60079-0:2017 Explosive atmospheres- Part 0: Equipment - General requirements Edition:7.0
• IEC 60079-31 :2013 Explosive atmospheres- Part 31: Equipment dust ignition protection by enclosure „t“ Edition:2
• IEC 60079-7:2017 Explosive atmospheres - Part 7: Equipment protection by increased safety „e“ Edition:5.1

Ein erfindungsgemäßes elektronisches Gerät umfasst:

• eine elektronische Schaltung;
• ein Gerätegehäuse, in welchem die elektronische Schaltung angeordnet ist;
• zumindest eine elektrische Leitung;
• eine erfindungsgemäße Fixiervorrichtung,
• wobei die Fixiervorrichtung beispielsweise an oder in einer Gerätegehäusewandung fixiert ist.

In this way, the following standards are met:

• IEC 60079-0:2017 Explosive atmospheres - Part 0: Equipment - General requirements Edition:7.0
• IEC 60079-31 :2013 Explosive atmospheres- Part 31: Equipment dust ignition protection by enclosure “t” Edition:2
• IEC 60079-7:2017 Explosive atmospheres - Part 7: Equipment protection by increased safety “e” Edition:5.1

An electronic device according to the invention comprises:

• an electronic circuit;
• a device housing in which the electronic circuit is arranged;
• at least one electrical line;
• a fixing device according to the invention,
• wherein the fixing device is fixed, for example, on or in a device housing wall.

In one embodiment, the electronic device is a field device of measurement/automation technology set up to measure at least one measured variable,
wherein the electronic circuit is an electronic measuring/operating circuit and is set up to determine and provide measured values of the measured variable.

• zumindest einen Ultraschallwandler;
• wobei die elektronische Mess-/Betriebsschaltung zum Betreiben des Ultraschallwandlers eingerichtet ist.

In one embodiment, the field device is an ultrasonic measuring device and includes the following:

• at least one ultrasonic transducer;
• wherein the electronic measuring/operating circuit is set up to operate the ultrasonic transducer.

In one embodiment, the ultrasonic measuring device is an ultrasonic flow measuring device or an ultrasonic level measuring device.

• 1 a), b) und c) zeigen eine beispielhafte erfinderische Fixiervorrichtung;
• 2 a) und b) skizzieren zwei Schrägansichten auf einen aufgeschnittenen beispielhaften erfindungsgemäßen elastischen Körper;
• 3 skizziert einen Verlauf einer elektrischen Leitung durch den elastischen Körper;
• 4 skizziert ein beispielhaftes erfindungsgemäßes elektronisches Gerät mit einer erfindungsgemäßen elektrischen Fixiervorrichtung.

The invention is described below using exemplary embodiments according to the invention.

• 1 a), b ) and c) show an exemplary inventive fixing device;
• 2a) and b) sketch two oblique views of a cut-away exemplary elastic body according to the invention;
• 3 sketches a course of an electrical line through the elastic body;
• 4 outlines an exemplary electronic device according to the invention with an electrical fixing device according to the invention.

1a) until c ) show three oblique views of an exemplary inventive fixing device 10 with a housing 11 comprising a first housing part 11.1 and a second housing part 11.2, which are in an assembled state, see 1c) , form a housing cavity 11.3. The fixing device also has an elastic body 12, which is designed to guide electrical lines 2. The lines run through through openings 11.4 of the housing parts and through through channels 12.1 of the elastic body 12.

The housing parts 11.1 and 11.2 can be joined together using a screw mechanism, as shown here purely as an example. However, other joining mechanisms such as a snap mechanism can also be implemented.

The number of lines 2 shown here is intended to be purely exemplary and not restrictive.

According to the invention, at least one support element 13 is arranged in the elastic body, see 1b) , which is designed to form a locally stiff area. In this way, an electrical line 2 is locally deformed, for example bent, when the housing parts are joined together. This increases the mechanical frictional resistance of the electrical line in the elastic body, so that a simple and robust securing of the electrical line is implemented in the fixing device. In one embodiment, the fixing device is set up to ensure a minimum pull-off force of 150 Newtons.

The support element can be, for example, rod-shaped or spherical, or can take on any other geometric shape.

• IEC 60079-0:2017 Explosive atmospheres- Part 0: Equipment - General requirements Edition:7.0
• IEC 60079-31:2013 Explosive atmospheres- Part 31: Equipment dust ignition protection by enclosure „t“ Edition:2
• IEC 60079-7:2017 Explosive atmospheres - Part 7: Equipment protection by increased safety „e“ Edition:5.1

In this way, the requirements of the following standards are met:

• IEC 60079-0:2017 Explosive atmospheres - Part 0: Equipment - General requirements Edition:7.0
• IEC 60079-31:2013 Explosive atmospheres- Part 31: Equipment dust ignition protection by enclosure “t” Edition:2
• IEC 60079-7:2017 Explosive atmospheres - Part 7: Equipment protection by increased safety “e” Edition:5.1

The elastic body can have a polymer such as silicone, thermoplastic elastomer or rubber, in particular acrylonitrile-butadiene rubber. In one embodiment, the elastic body has a first modulus of elasticity, wherein the at least one support element has a second modulus of elasticity, wherein the second modulus of elasticity is greater than the first modulus of elasticity by at least a factor of 10 and in particular at least a factor of 50. It is important that the increased local stiffening of the elastic body caused by the at least one support element has a higher bending moment than the electrical line to be formed. For example, the bending moment of the local stiffening can be greater than a bending moment of the electrical line by at least a factor of 3.

In one embodiment, the at least one support element has a metal or a plastic.

In one embodiment, several support elements 13 can also be arranged in the elastic body, so that, for example, more than one local change in shape or one spatially extensive change in shape is imposed on at least one electrical line.

2a) and b) take two oblique views of the cut open elastic body 12 1a) until c ), once in a relieved state, 2a) , and once in a loaded state, 2 B) . By loading or joining the housing parts 11.1, 11.2, the elastic body is deformed at least in one area, so that the feedthrough channels 12.1 are deformed. In this way, an electrical line in a feedthrough channel is subjected to a bending moment, so that the electrical line is formed.

3 sketches a cross section through the elastic, deformed body 12 according to 1c) and 2 B) . Lines guided through the feedthrough channels 12.1 are pressed and bent or kinked by the feedthrough channels in the shape change area 12.3.

4 outlines an exemplary electronic device 1 according to the invention with an electrical fixing device 10 according to the invention.

The electronic device is an ultrasonic flow measuring device with an electronic operating circuit 20, which is arranged in a device housing 30. A fixing device 10 according to the invention is arranged in a device housing wall 31 and leads electrical lines 2 to ultrasonic transducers 40, which are arranged on a measuring tube.

The electronic device sketched here is purely an example. The fixing device according to the invention can be a general electronic device with an operating circuit or a general field device of measurement/automation technology, which is set up to measure at least one measured variable, wherein the electronic operating circuit 20 is an electronic measurement/operating circuit and is set up to receive measured values of the Determine and provide metrics.

Reference symbol list

1

Electronic device

2

electrical line

10

Fixing device

11

Housing

11.1

first housing part

11.2

second housing part

11.3

Housing cavity

11.4

Passage opening

12

elastic body

12.1

implementation channel

12.2

body cavity

12.21

drilling

12.3

Shape change area

13

Support element

20

electronic operating circuit

30

Device housing

31

Device housing wall

40

Ultrasonic transducer

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DD 265037 A1 [0002]

Claims (12)

Fixing device (10) set up for fixing at least one electrical line (2), comprising: - a housing (11) with a first housing part (11.1) and a second housing part (11.2), which housing parts in an assembled state form a housing cavity (11.3) form, wherein the first housing part and the second housing part each have at least one feedthrough opening (11.4) for passing through at least one of the electrical lines; - an elastic body (12), which is arranged in the housing cavity and is compressed in the assembled state by the first housing part and the second housing part, the elastic body having at least one feed-through channel (12.1) for the at least one electrical line, characterized in that the elastic body has at least one body cavity (12.2), such as a bore (12.21), in which at least one body cavity a support element (13) is arranged, by means of which at least one support element causes a local stiffening of the elastic body, wherein the at least one Support element is designed to bring about a local change in shape, such as a bend or a kink, when the first housing part and the second housing part are joined together in at least one electrical line. Fixing device after Claim 1 , wherein a plurality of support elements (13) are arranged in the elastic body (12), the support elements being designed to produce several local changes in shape when the first housing part (11.1) and the second housing part (11.2) are joined together in at least one electrical line (2). cause. Fixing device after Claim 1 or 2 , wherein the at least one support element (13) can be integrated after production of the elastic body (12), or wherein the at least one support element is integrated into the elastic body during production of the elastic body. Fixing device according to one of the preceding claims, wherein the elastic body (12) has a first modulus of elasticity, and wherein the at least one support element (13) has a second modulus of elasticity, wherein the second modulus of elasticity is greater than the first modulus of elasticity by at least a factor of 10 and in particular at least a factor of 50. Fixing device according to one of the preceding claims, wherein the at least one support element (13) has a metal or a plastic. Fixing device according to one of the preceding claims, wherein the elastic body (12) has a polymer such as silicone, thermoplastic elastomer or rubber, in particular acrylonitrile-butadiene rubber. Fixing device according to one of the preceding claims, wherein the elastic body (12) has a greater hardness in a deformation area (12.3) than outside the contact area. Fixing device according to one of the preceding claims, wherein the fixing device (10) is designed to ensure a minimum pull-off force of 150 Newton. Electronic device (1) comprising: an electronic operating circuit (20) for operating the device; a device housing (30) in which the electronic operating circuit is arranged; at least one electrical line (2); a fixing device (10) according to one of the preceding claims, wherein the fixing device is fixed, for example, on or in a device housing wall (31). Electronic device according to Claim 9 , wherein the electronic device (1) is a field device of measurement/automation technology set up to measure at least one measured variable, wherein the electronic operating circuit (20) is an electronic measuring/operating circuit and is set up to determine and provide measured values of the measured variable. Electronic device according to Claim 10 , wherein the field device is an ultrasonic measuring device and comprises: at least one ultrasonic transducer (40); wherein the electronic measuring/operating circuit (20) is set up to operate the ultrasonic transducer. Electronic device according to Claim 11 , where the ultrasonic measuring device is an ultrasonic flowmeter or an ultrasonic level measuring device.

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