DE202018104672U1 - Line adapter and line structure - Google Patents

Abstract

Line adapter (1), in particular for a diesel emission fluid sensor, comprising a pipe section (2) with a radially projecting shoulder (4), the shoulder (4) having a planar abutment surface (6) perpendicular to an axial direction (A ) for a sealing ring (44).

Description

The invention relates to a line adapter, in particular a suction line adapter for a diesel emission fluid sensor (DEF sensor) or a filter of a DEF sensor.

The invention further relates to a line structure, in particular for a DEF sensor or its filter.

For example, DEF sensors are installed in DEF tanks in motor vehicles to control the purity of the fluid.

Bead suction lines are usually inserted directly into DEF sensors. The suction line is at least partially immersed in the fluid and transports the fluid through the sensor to the SCR system, e.g. B. via a pump. In order to prevent the entry of deposits such as solid particles, a filter is provided in front of the suction line. The filter is mounted on the suction line, for example by inserting the suction line into a socket of a filter housing. To prevent the sensor from malfunctioning, the connection between the suction line and the filter housing must be well sealed. In order to achieve a good seal, a sealing ring is provided, which is compressed between the housing and the suction line. In today's designs of a bead suction line, however, it has proven difficult to ensure the tightness of the seal.

The aim of the invention is therefore to provide a line adapter, in particular a suction line adapter for a diesel emission fluid sensor, and a line structure with a higher degree of reliability.

The object is achieved according to the invention by a line adapter which comprises a tube section with a radially projecting shoulder, the shoulder comprising a planar abutment surface perpendicular to an axial direction for a sealing ring.

Furthermore, the object is achieved according to the invention by a line structure comprising a housing, in particular for a filter, for. B. a DEF sensor, with a through hole extending in the axial direction, a line adapter according to the invention and a sealing ring, wherein the through hole comprises a counter abutment surface, which is arranged sealingly in the axial direction with respect to the abutment surface, and wherein the sealing ring is suitable for this is to be placed between the abutment surface and the counter abutment surface in the housing.

In this solution according to the invention, a sealing ring track is provided in which the sealing ring, when it is compressed, can expand in the axial direction. Due to the flat butt surface, the dimension of the web can be precisely specified in relation to the distance between the butt surface and the counter-butt surface. The better control in view of the dimension mentioned above leads to better control over the sealing ring compression on the one hand and less difficulties in the manufacture of the line adapter and / or the line construction according to the given specifications on the other hand. The solution according to the invention thus provides improved sealing performance and considerably reduces the risk of a leak in the structure.

In the context of the invention, the formulation “perpendicular to” can also cover embodiments which deviate from the vertical axis by a margin of ± 15 °. With this scope, the compression force that acts on the sealing ring is largely directed in the axial direction. Unwanted radial deformations of the sealing ring can thus be avoided.

The invention can be further improved by the following features that are independent of each other in terms of their respective technical effects and can be arbitrarily combined with each other.

For example, the butt surface can be annular. In this embodiment, the shoulder can form a closed ring and surround the pipe section.

According to one embodiment of the invention, the tube or tube section and the shoulder can be formed by two separate joined parts. Thus, the design of each part can be customized according to its specific task, and the line adapter can be easily repaired if one of the parts malfunctions.

The pipe section part and the heel part can preferably be joined together by cohesive bonding, for example by welding, in order to create a robust and tight connection. In particular, welding ensures permanent joints with a strength equal to or sometimes even better than that which can be achieved by the base metal, thereby ensuring the relative positions of the part comprising the pipe section and the part comprising the shoulder can be.

The pipe section part and the part comprising the shoulder can be joined in the axial direction. The part that makes up the paragraph includes, for example, at least partially enclose the pipe section in the radial direction. The pipe section can be partially received in an opening of the heel part and z. B. be joined by welding.

The part comprising the shoulder can be provided with a central flange which projects beyond the pipe section. This leads to a secure positioning of the sealing ring even during the movement of the housing in the axial direction relative to the line adapter. The part comprising the shoulder can be a machined workpiece and welded to the pipe section.

The part comprising the shoulder can be provided with a bushing to receive a part of the pipe section in the axial direction. The pipe section can then be welded to the socket, which enables a light and robust connection between the part comprising the shoulder and the pipe section. The central flange and the pipe section can have the same inner diameter and can preferably be arranged coaxially to one another.

The part that includes the heel can be a ring that can be placed on the pipe section, creating a large contact area. A more robust and easily weldable connection can thus be provided. The ring can be a simple sealing washer, which is cost-effective to manufacture and has a low weight.

The line adapter can preferably comprise a metal, which comprises or consists of steel, so that the line adapter can be highly mechanically robust. Since the line adapter is subjected to a high mechanical load in the form of vibrations and / or shocks, the mechanical robustness further increases the durability of the line adapter.

The pipe section of the line adapter can preferably be a suction line of a DEF sensor for drawing in the diesel emission fluid and transporting it to the sensor. For this purpose, the pipe section can be connected to a pump or can comprise such a pump in order to draw the fluid through the suction line.

According to a further embodiment of the invention, the abutment surface can be formed on one end of an extension which extends away from a radial bulge in the axial direction. The cross section of the bulge in an axial plane, i.e. H. a plane perpendicular to the radial direction can in particular be a polygon, preferably a rectangle.

According to an exemplary embodiment, the radial bulge cannot be rotationally symmetrical in a plane perpendicular to the axial direction. In this way, a rotational position of the cable adapter can be precisely defined. As a result, the orientation of the line adapter relative to the housing of the line structure can be determined, and rotation of the line adapter relative to the housing can be prevented. This in turn reduces wear due to friction between the housing and the line adapter, thereby further preventing misalignment of the pipe section and a filter located at one end of the housing. It should be noted that in the context of the invention, the phrase “rotationally symmetrical” does not include n-fold rotationally symmetrical shapes, such as 2-fold, 6-fold or 8-fold rotationally symmetrical forms. The radial bulge can be 2-fold, 4-fold, 6-fold rotationally symmetrical, as long as the rotational position of the radial bulge can be precisely determined.

The through hole can comprise a bushing in which the shoulder and the insert ring are inserted in a plug-in direction, the bushing widening in a guide chamfer against the plug-in direction. The chamfer can prevent the sealing ring from touching any sharp edge when the sealing ring and the cable adapter are mounted in the through hole of the housing. The sealing ring can lie tangentially on the guide chamfer and slide smoothly along the guide chamfer if the sealing ring and the cable adapter are inserted into the through hole in the direction of insertion, thereby avoiding damage to the sealing ring during the installation process. The sealing ring can lie against the guide chamfer at an angle of 15 ° to 25 °. The guide chamfer is preferably positioned at a cone angle of 15 ° to 20 °.

The housing can be a filter housing, which comprises a particle filter, which is arranged at one end of the through hole at the distal end in the insertion direction.

The sealing ring can preferably be an O-ring.

According to a further advantageous embodiment of the invention, the guide chamfer can meet in a direction opposite to the insertion direction in a region that is not rotationally symmetrical. The non-rotationally symmetrical region and the non-rotationally symmetrical line adapter can in particular be complementary and / or complement one another, eg. B. to form a positive connection that blocks the rotational movement between the line adapter and the housing. Thus, when the complementary and / or complementary parts are engaged with each other, the rotational position of the line adapter in the housing can be locked, which further prevents misalignment between the filter and the line adapter. The housing and the line adapter may include complementary locking features, such as a latch and a complementary notch for locking the relative rotational position of the housing and the line adapter.

The non-rotationally symmetrical region can comprise a 2-fold, 4-fold, 6-fold or 12-fold rotational symmetry, e.g. B. a hexagonal shape as long as the rotational position can be locked.

The housing can further comprise a securing groove for receiving an element securing the adapter, the securing groove extending at least partially to the through hole. The securing groove enables the insertion of an element securing the adapter, e.g. B. a clip ring. The movement of the element securing the adapter, which is mounted in the securing groove in the axial direction, can be blocked. Thus, the shoulder can rest against the element securing the adapter in the axial direction and be prevented from moving further. Due to the strong vibrations to which the structure is exposed, for example in motor vehicles, unintentional removal of the line adapter from the through hole can be prevented by the element securing the adapter.

In order to also provide a secure receptacle for the sealing ring even during a relative movement of the housing and the line adapter in the axial direction, the securing groove can be arranged in particular in a direction opposite to the insertion direction along the guide chamfers.

The line adapter and the line structure according to the invention are explained in more detail below with reference to the attached drawings, in which exemplary embodiments are shown.

In the figures, the same reference symbols are used for elements that correspond to one another in terms of their function and / or structure.

According to the description of the various aspects and embodiments, elements shown in the drawings may be omitted if the technical effects of these elements are not necessary for a particular application, and vice versa: d. H. Elements which are not shown or described in relation to the figures, but which have been described above can be added if the technical effect of these particular elements is advantageous in a specific application.

• 1 eine schematische Perspektivansicht einer ersten Ausführungsform eines erfindungsgemäßen Leitungsadapters;
• 2 eine schematische Ansicht eines erfindungsgemäßen Leitungsaufbaus mit dem in 1 gezeigten Leitungsadapter;
• 3 eine schematische Draufsicht des in 2 gezeigten erfindungsgemäßen Leitungsaufbaus;
• 4 eine schematische Perspektivansicht eines erfindungsgemäßen Leitungsaufbaus mit einer zweiten Ausführungsform eines erfindungsgemäßen Leitungsadapters;
• 5 eine dritte Ausführungsform eines erfindungsgemäßen Leitungsadapters in einer Draufsicht, einer Seitenansicht und einer geschnittenen Ansicht; und
• 6 eine schematische Schnittansicht eines erfindungsgemäßen Leitungsaufbaus mit dem in 5 gezeigten Leitungsadapter.

The figures show:

• 1 a schematic perspective view of a first embodiment of a line adapter according to the invention;
• 2 is a schematic view of a line structure according to the invention with the in 1 line adapter shown;
• 3 a schematic plan view of the in 2 shown line structure according to the invention;
• 4 a schematic perspective view of a line structure according to the invention with a second embodiment of a line adapter according to the invention;
• 5 a third embodiment of a line adapter according to the invention in a plan view, a side view and a sectional view; and
• 6 is a schematic sectional view of a line structure according to the invention with the in 5 shown cable adapter.

In 1 is a schematic perspective view of a first embodiment of a line adapter according to the invention 1 shown. The cable adapter 1 comprises a tubular tube section 2 and a radially projecting paragraph 4 , where the paragraph 4 also a planar butt surface 6 comprises perpendicular to an axial direction A is arranged for a sealing ring.

The pipe section 2 and the paragraph 4 are on two separate parts 8th . 10 trained, the part 8th that the paragraph 4 includes, to the part 10 that the pipe section 2 includes, is attached. The pipe section 2 is from a tubular body 12 formed which is in the axial direction A extends, and can be used as a suction line of a diesel emission fluid sensor for measuring the purity of diesel emission fluid in a tank (not shown). Thus, the pipe section 2 to a pump 14 be connected, the schematic in 1 is shown to allow fluid from the tank to the sensor 15 to flow what's schematically in drawing 1 is shown.

The part 8th that the paragraph 4 is ring-shaped with a ring opening 16 that have a diameter 18 which is substantially equal to an outer diameter 20 of the pipe section 2 is. The pipe section 2 is smooth in the ring opening 16 introduced, and the two parts 8th . 10 are put together. Preferably the two parts 8th . 10 joined by welding to make it safe and sturdy Link between the part comprising the paragraph 8th and the pipe section 2 provide. The two parts 8th . 10 may particularly include tack welds (not shown). By merging the paragraph 8th comprehensive part and the pipe section 2 there can be a relative movement between the parts 8th . 10 be prevented.

The part comprising the paragraph 8th has a notch 22 on its outer circumference 24 , causing the part 8th becomes rotationally asymmetrical. This allows the rotational position of the part comprising the paragraph 8th and / or the line adapter 1 to be determined exactly. The notch 22 can be a locking feature 26 serve that can intervene in a complementary locking feature that is formed in the housing.

In 2 is a sectional view of a line structure according to the invention 30 shown. In 3 is a top view of the line structure according to the invention 30 shown.

The line structure 30 includes a housing 32 , A filter 34 , which is only shown schematically, can be in the housing 32 be arranged. The housing 32 is with a through hole 36 provided that in the axial direction A extends. The filter is on a distal end 38 of the through hole 36 arranged and filters deposits from the liquid, especially the diesel emission fluid.

A line adapter 1 as he is in 1 is described is in a plug-in direction S from a proximal end 40 of the through hole 36 opposite to the distal end 38 in the axial direction A in the through hole 36 inserted. The direction of insertion S is essentially parallel to the axial direction A arranged.

The through hole 36 is with a mating face 42 provided in the axial direction A opposite the bump 6 is arranged. A sealing ring 44 to seal the connection between the cable adapter 1 and the housing 32 is on the tubular body 12 arranged and prevents the leakage of fluids. So that the sealing ring 44 the sealing ring must achieve its intended sealing performance 44 be squeezed together. A little compression of the sealing ring 44 can promote leakage and must therefore be avoided. While moving in the direction perpendicular to the axial direction A is compressed, the sealing ring extends 44 in the axial direction A ,

The through hole 36 includes a socket 46 , the socket 46 in a leadership phase 48 in a direction opposite to the direction of insertion S expands and into a non-rotationally symmetrical area 49 coincides. The socket 46 also widens from the leadership phase 48 in one stage 50 in the direction opposite to the direction of insertion S , The stage 50 includes a stop surface that is perpendicular to the direction of insertion S is arranged and to the butt surface 6 of the paragraph 4 has. At least a portion of the bump surface 6 bumps into the stop surface 52 when the line adapter 1 in the housing 32 is introduced, causing any further movement of the paragraph 4 in the direction of insertion S about the stage 50 is blocked out.

In an alternative embodiment, the part 8th that the paragraph 4 comprises, be formed with two flattened surfaces which are arranged diametrically to one another on the outer circumference. The non-rotationally symmetrical area 49 can be a complementary shape with a circular socket 46 have two flattened surfaces so that the part 8th in two possible rotary positions smooth into the socket 46 can be introduced (see 5 ). This design can be a simple and inexpensive effective manufacture of the part comprising the paragraph 8th enable.

The sealing ring 44 has a cross section 54 perpendicular to the axial direction A which, when not compressed, is smaller than the widest section of the chamfer 48 is so that the sealing ring 44 tangential to the leading bevel 48 fits smoothly along the chamfer 48 slides when the line adapter 1 is inserted into the housing. The sealing ring is in the fully assembled state (not shown) 44 in a geomembrane 56 arranged, which is in a circumferential slot 84 between the bump 6 and the mating face 42 in the axial direction A located. Due to the compression of the sealing ring 44 can the sealing ring 44 in the axial direction A expand.

The housing 32 is preferably made of a plastic material that has a higher thermal expansion coefficient than the cable adapter 1 having. The line structure is particularly important in motor vehicle applications 30 Exposed to heat, causing the components to expand. If the thermal expansion of the housing 32 the thermal expansion of the cable adapter 1 and / or the sealing ring 44 exceeds the compression of the sealing ring 44 from. If, conversely, the thermal expansion of the housing 32 lower than the thermal expansion of the cable adapter 1 and / or the sealing ring 44 the compression increases, causing the sealing ring 44 can be damaged.

The compression of the sealing ring 44 , measured by reducing the cross section 54 by extension, preferably based on the ISO 3601-2 and can have a cross section of about 14% to 34% compared to the cross section 54 of seal 44 in the uncompressed state.

By providing a flat butt surface 6 can the dimension 58 the geomembrane 56 in the axial direction A be specified exactly so that it has a low tolerance, whereby the degree of compression can be precisely controlled and thus the sealing performance can be improved and thereby the risk of leakage is significantly reduced. It is easier to use the line adapter 1 to be manufactured in such a way that it meets the given specifications

The housing 32 also includes a locking latch 60 from an inner surface of the through hole 36 perpendicular to the axial direction A between the proximal end 40 and the level 50 protrudes. The locking bolt 60 is a complementary blocking feature 62 to the notch 22 formed on the outer circumference 24 of the part comprising the paragraph 8th is formed. So the cable adapter 1 and the housing 32 engage each other with a positive fit, blocking any relative rotation and misalignment of the filter 34 and the tubular body 12 is prevented.

To build the line 30 to keep in the assembled state and to prevent the cable adapter 1 against the direction of insertion S from the through hole 36 falls, the housing can be secured with a locking groove 64 be provided, which are at least partially to the through hole 36 extends. An element securing the adapter 66 , for example a clip ring 68 , can be in the locking groove 64 be introduced and at least partially the cross section of the paragraph 4 comprehensive part 8th overlap. So that's the paragraph 4 comprehensive part 8th against the element securing the adapter 66 at, the surface from the butt surface 6 points away when it is in a direction opposite to the direction of insertion S is moved, causing any further movement of the cable adapter 1 relative to the housing 32 against the direction of insertion S is blocked.

The element securing the adapter 66 includes curved end portions 70 going around pillar 72 can be bent in the locking groove 64 are arranged and in the axial direction A extend to inadvertently remove the element securing the adapter 66 to prevent due to vibration and / or shocks.

In 4 is a second embodiment of the line structure according to the invention 30 and the line adapter 1 shown. In contrast to in 2 The embodiment shown is the through hole 36 not with one level 50 provided the through hole 36 further between the proximal end 40 and the leadership phase 48 expands.

The part 8th , which includes the heel, further includes a central flange 74 that over the pipe section 2 protrudes and a tube section 76 forms. A free end 78 of the pipe section 2 is at least partially in the part comprising the paragraph 8th added the one with a slant 80 is provided, which is in the direction opposite to the direction of insertion S expands. A welded joint 82 can on the slope 80 be provided to the two parts 8th . 10 fit together securely.

Paragraph 4 is partially in a slot 84 introduced in which the sealing ring 44 is arranged. Hence the sealing ring 44 safely recorded, even if the housing 32 in the axial direction A relative to the part 8th that includes the paragraph is moved. This creates a thicker chamfer 48 possible because of the paragraph 4 the sealing ring 44 blocked so that it is not the leading bevel 48 in the direction opposite to the direction of insertion S can reach. This can cause the sealing ring to expand 44 when he's the lead 48 reached, prevented.

As in 4 you can see is the inside diameter 86 of the tube section 76 equal to the inside diameter 88 of the pipe section that is seamless in the axial direction A are arranged. Thus, the tube section forms 76 also part of the suction line.

The tube section 76 is also with the locking feature 26 in the form of a cutout 90 provided the tube section 76 pierces in the radial direction. The cutout 90 can have a rectangular shape and in the axial direction A be open at a distal end, making a complementary locking feature 62 when inserting the cable adapter 1 in the housing 32 easy in the neckline 90 can be introduced. Thus, the blocking features in engagement can 26 . 62 another movement of the line adapter 1 in the direction of insertion and a rotary movement of the cable adapter 1 To block.

In 5 is a third embodiment of the line adapter 1 shown in a top view, a side view and a sectional view. 6 shows the cable adapter 1 out 5 in a line setup 30 ,

The cable adapter 1 comprises an annular part 8th , which includes the paragraph, and a pipe section 2 that the ring opening 16 of the part comprising the paragraph 8th pierces in the axial direction. Similar to the first embodiment shown in FIGS 1 to 3 shown is the paragraph comprehensive part 8th to the outer circumference of the pipe section 2 attached by welding.

The part 8th , which includes the heel, includes a radial bulge 92 and an extension 94 that differ from the radial bulge 92 extends in the axial direction. The bump 6 is at one end 96 the extension formed by the radial bulge 92 points away.

At least part of the extension 94 can smooth in the slot 84 be introduced so that there is an overlap 94 between the slot 84 and the extension 94 is created. The overlap 100 provides a tolerance for the relative movement of the case 32 and the line adapter 1 in the axial direction A , whereby the sealing ring 44 safe in the slot 84 is recorded.

The radial bulge 92 lies on the stop surface 52 every further movement in the direction of insertion S blocked. The element securing the adapter 66 also prevents movement in the opposite direction to the plugging direction S as described above.

The radial bulge 92 has two flattened surfaces 98 , which are arranged diametrically opposite one another on their outer circumference, and is not rotationally symmetrical in a plane perpendicular to the axial direction A , The flattened surfaces 98 serve as locking features 26 that have a rotational movement between the line adapter 1 and the housing 32 To block. For form-locking intervention in the blocking feature 26 is the through hole 36 the housing with a complementarily formed locking feature 62 Mistake.

LIST OF REFERENCE NUMBERS

1

line adapter

2

pipe section

4

paragraph

6

abutting face

8th

part of the paragraph

10

part comprising the pipe section

12

tubular body

14

pump

16

ring opening

18

Diameter of the ring opening

20

Outside diameter of the pipe section

22

score

24

outer periphery

26

locking feature

30

cable construction

32

casing

34

filter

36

Through Hole

38

distal end

40

proximal end

42

Against abutment surface

44

poetry

46

Rifle

48

guide land

49

not rotationally symmetrical area

50

step

52

stop surface

54

cross-section

54

seal

56

geomembrane

58

Dimension of the geomembrane

60

safety catch

62

complementary locking feature

64

securing groove

66

element securing the adapter

68

clip ring

70

curved end sections

72

pier

74

central flange

76

tube portion

78

free end

80

slope

82

welded joint

84

slot

86

Inner diameter of the tube section

88

Inner diameter of the pipe section

90

neckline

92

radial bulge

94

renewal

96

End of extension

A

axial direction

S

plug-in direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Non-patent literature cited

• ISO 3601-2 [0045]

Claims (12)

Line adapter (1), in particular for a diesel emission fluid sensor, comprising a pipe section (2) with a radially projecting shoulder (4), the shoulder (4) having a planar abutment surface (6) perpendicular to an axial direction (A ) for a sealing ring (44). Cable adapter (1) according to Claim 1 , wherein the pipe section (2) and the shoulder (4) are formed by two separate joined parts (8, 10). Cable adapter (1) according to Claim 2 , wherein the pipe section (2) and the part comprising the paragraph (8) are joined together in the axial direction (A). Line adapter (1) according to one of the Claims 1 to 3 , wherein the pipe section (2) is at least partially received in the part (8) comprising the shoulder. Line adapter (1) according to one of the Claims 1 to 4 , wherein the abutting surface (6) is formed at one end of an extension (94) which extends in the axial direction (A) from a radial bulge (92). Cable adapter (1) according to Claim 5 , wherein the bulge (92) in a plane perpendicular to the axial direction (A) is not rotationally symmetrical. Line adapter (1) according to one of the Claims 2 to 6 wherein the part (8) comprising the shoulder (4) further comprises a central flange (74) which projects in the axial direction (A) beyond the pipe section (2). Line structure (30) comprising a housing (32), in particular a filter housing (32), with a through hole (36) which extends in the axial direction (A), a line adapter (1) according to one of the Claims 1 to 7 and a sealing ring (44), the through-hole (36) comprising a counter abutment surface (42) and the sealing ring (44) being suitable for sealingly arranged between the abutment surface (6) and the counter abutment surface (42) in the housing (34) to become. Line structure (30) according to Claim 8 , wherein the through hole (36) comprises a socket (46) in which the shoulder (4) and the sealing ring (44) are inserted in a plug-in direction (S) and the socket (46) is in a guide chamfer (48) in a direction opposite to the direction of insertion (S). Line structure (30) according to Claim 9 , the guide chamfer (48) meeting in a direction opposite to the insertion direction (S) in a non-rotationally symmetrical region (49). Line structure (30) according to one of the Claims 8 to 10 , wherein the housing (32) comprises a securing groove (64) for receiving an element (66) securing the adapter, and wherein the securing groove (64) extends at least partially to the through hole (36). Line structure (30) according to Claim 11 , wherein the securing groove (64) of the guide chamfer (48) follows opposite to the direction of insertion (S).

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