[0001] The invention relates to a fluid fitting arrangement. Furthermore, the invention
relates to a fluid system comprising such fluid fitting arrangement.
[0002] With respect to fuel systems in vehicles, fittings are known that are welded, for
example, on high-pressure fuel pumps. These fittings conventionally provide a hydraulic
as well as a mechanical connection in one single element. Particularly with regard
to the outlet connections of the high-pressure fuel pumps, these conventional fittings
are subjected to fatigue stresses due to pressure pulsations of the fluid.
[0003] The fluid fitting arrangement of prior art document
FR 2 872 252 comprises an intermediate part disposed in a junction fixed to a common rail at each
connection which is arranged in a wall and comprises a conical flare whose base is
oriented towards the outside of said rail and comprises a connector which is provided
with an internal channel which is arranged in the junction and whose top end interacts
with the end of the tube and whose low end interacts with said conical flare.
[0004] It is desirable to create a fluid fitting arrangement which is reliable. Furthermore,
it is desirable to create a fluid system which works reliably.
[0005] According to one embodiment of the invention, the fluid fitting arrangement comprises
a first part of a fluid system. The fluid fitting arrangement further comprises a
coupling arrangement.
[0006] The coupling arrangement comprises a tube element for hydraulically coupling the
first part of the fluid system with a second part of the fluid system. The tube element
is hydraulically coupled with the first part of the fluid system. Furthermore, the
tube element is hydraulically coupleable with the second part of the fluid system.
[0007] The coupling arrangement further comprises a threaded sleeve for mechanically coupling
the first part of the fluid system with the second part of the fluid system. The threaded
sleeve is mechanically coupled with the first part of the fluid system. The threaded
sleeve is further mechanically coupleable with the second part of the fluid system.
[0008] The coupling arrangement comprises two elements for providing the hydraulic and the
mechanical coupling to the first part of the fluid system. Therefore, the threaded
sleeve that provides the mechanical coupling is not subject to direct pressure pulsations
since the fluid under pressure is guided only in the tube element during operation.
Therefore, the coupling between the threaded sleeve and the first part of the fluid
system, for example a high-pressure pump, is reliable and durable. Particularly, a
tension force in direction away from the first part is only affected to the threaded
sleeve. The tension force is not affected to the tube element. The tension force is
for example affected due to the pressure pulsation of the fluid during operation.
[0009] Furthermore, a welded connection to couple the treaded sleeve with the first part
is provided, wherein the tube element and the threaded sleeve are provided as separate
parts. The threaded sleeve surrounds the tube element coaxially and the threaded sleeve
is radially disposed at a distance from the tube element.
[0010] Due to the separation of the tube element and the threaded sleeve the coupling of
the coupling arrangement with the first part of the fluid system is particularly reliable,
since the tube element primarily serves for the hydraulic coupling and the threaded
sleeve primarily serves for the mechanical coupling. On the other hand, that means
that the tube element primarily serves not for a mechanical coupling of the first
part with the second part and the threaded sleeve primarily serves not for a hydraulic
coupling of the first part with the second part.
[0011] According to further embodiments, the first part of the fluid fitting arrangement
is a pump for the delivery of the fluid, for example a high-pressure pump for the
delivery of fuel in a vehicle. The coupling arrangement provides a reliable fluid
supply to the high-pressure pump. In particular, the coupling arrangement provides
a reliable fluid supply on the outlet of the pump.
[0012] According to an embodiment, the fluid system comprises such a fluid fitting arrangement.
The fluid system further comprises the second part that is coupled to the coupling
arrangement.
[0013] That way, a coupling between the first and the second part of the fluid system is
provided in which the hydraulic coupling and the mechanical coupling are separate
from each other. Therefore, the coupling is reliable. Particularly, a tension force
by the second part in direction away from the first part is only affected to the threaded
sleeve. The tension force is not affected to the tube element. The tension force is
for example affected due to the pressure pulsation of the fluid during operation.
[0014] Reference will now be made in detail to the preferred embodiments, examples of which
are illustrated in the accompanying drawing.
[0015] The figure schematically shows a fluid fitting arrangement according to an embodiment.
[0016] The figure schematically shows a fluid fitting arrangement 100. The fluid fitting
arrangement 100 comprises a first part 101 of a fluid system. In the exemplary embodiment,
the first part 101 is part of a high-pressure pump for the delivery of the fluid.
For example, the first part 101 is a housing of the pump.
[0017] The fluid fitting arrangement 100 further comprises a coupling arrangement 110. The
coupling arrangement 110 is coupled with the first part 101, for example with the
housing of the pump 101.
[0018] The coupling arrangement comprises a tube element 111 and a threaded sleeve 112.
The threaded sleeve 112 comprises a hollow cylindrical form such that the threaded
sleeve 112 surrounds the tube element 111 radially. The threaded sleeve 112 surrounds
the tube element 111 such that a distance 113 is disposed between the tube element
111 and the threaded sleeve 112 along the longitudinal extension of the threaded sleeve
112 and the tube element 111. Furthermore, the threaded sleeve 112 comprises a thread
114 which provides a mechanical coupling interface for a second part 120 of the fluid
system.
[0019] The tube element 111 and the threaded sleeve 112 of the coupling arrangement 110
are provided as separate parts. The tube element 101 is hydraulically coupled with
the pump 101. Further, the tube element 111 is coupled with the pump 101 via a welded
connection 103. A first end of the tube element 111 is coupled with the pump 101 and
the opposite end region of the tube element is hydraulically coupleable. The tube
element 111 provides a hydraulic interface to the pump 101 for a hydraulically coupling
with the second part of the fluid system.
[0020] The threaded sleeve 112 of the coupling arrangement 110 is mechanically coupled to
the pump 101 via a second welded connection 104. A first end of the threaded sleeve
112 is coupled with the pump 101 and the opposite end region of the threaded sleeve
is mechanically coupleable. The threaded sleeve 112 provides a mechanical interface
to the pump 101 for a coupling with the second part of the fluid system.
[0021] Each of the threaded sleeve 112 and the tube element 111 is coupled to the pump 101
by the respective welded connection 103, 104. The welded connections 103 and 104 are
separate as well.
[0022] When the coupling arrangement 110 is coupled with the second part 120 of the fluid
system during operation, the threaded sleeve 110 provides the mechanical coupling
between the pump 101 and the second part 120. The hydraulic coupling to the second
part 120 is provided by the tube element 111. During operation, the fluid is guided
from the pump 101 via the tube element 111 to a tube 121 of the second part 120. During
operation, the threaded sleeve 111 is free of fluid and does not guide any fluid but
secures the second part 120 to the pump 101, for example via a coupling nut 122 that
is connected with the thread 114 of the threaded sleeve 112. The nut 122 mechanically
couples the second part 120 to the pump 101 via the threaded sleeve 111. The threaded
sleeve 121 is mechanically coupled to the pipe 121 that is hydraulically coupled to
the tube element 111.
[0023] Since the mechanical and the hydraulic couplings are divided into two separate couplings,
the mechanical coupling is particularly independent from the hydraulic coupling. The
welded connection 103 that couples the tube element 111 with the pump 101 primarily
needs to resist the pressure of the fluid during operation. The welding 104 primarily
needs to resist the mechanical connection of the second part 120. The welding 104
does primarily not need to resist the hydraulic pressure of the fluid guided through
the coupling arrangement. Therefore, each of the welded connections 103 and 104 is
particularly reliable. Furthermore, the tube element 101 provides a hermetically sealed
fluid connection from the pump 101 via the outlet valve 102 to the tube 121. Since
the hermetic fluid connection is provided by the tube element 111, the welded connection
104 of the threaded sleeve 112 must not be a hermetic welding.
[0024] In a preferred embodiment, the coupling arrangement is part of an outlet valve 102
of the pump 101. The outlet valve 102 is arranged in a cavity of the housing of the
pump 101 and provides an outlet of the delivered fluid under high pressure.
[0025] According to further embodiments, the coupling between the tube element 111 and the
housing of the pump 101 is provided by a threaded connection between the tube element
and the pump.
1. Fluid fitting arrangement (100), comprising
- a first part (101) of a fluid system and
- a coupling arrangement (110), the coupling arrangement comprising:
- a tube element (111) for hydraulically coupling the first part (101) of the fluid
system with a second part (120) of the fluid system, the tube element (111) being
hydraulically coupled with the first part (101) of the fluid system and being hydraulically
coupleable with the second part (120) of the fluid system,
- a threaded sleeve (112) for mechanically coupling the first part (101) of the fluid
system with the second part (120) of the fluid system, the threaded sleeve being mechanically
coupled with the first part (101) of the fluid system and being mechanically coupleable
with the second part (120) of the fluid system,
- a welded connection (104) to couple the threaded sleeve (112) with the first part
(101), wherein
- the tube element (111) and the threaded sleeve (112) are provided as separate parts,
- the threaded sleeve (112) surrounds the tube element (111) coaxially, and
- the threaded sleeve (112) is radially disposed at a distance (113) from the tube
element (111),
characterized in that the fitting arrangement comprises a welded connection (103) to couple the tube element
(111) with the first part (101).
2. Fluid fitting arrangement according claim 1, wherein the threaded sleeve (112) comprises
an elongated hollow cylindrical form.
3. Fluid fitting arrangement according to claim 1 or 2, wherein the threaded sleeve (112)
comprises a thread (114) for mechanically coupling the threaded sleeve (112) with
the second part (120) of the fluid system.
4. Fluid fitting arrangement according to one of claims 1 to 3, wherein the threaded
sleeve (112) is free of fluid.
5. Fluid fitting arrangement according to one of claims 1 to 4, wherein the first part
(101) is a pump for the delivery of the fluid.
6. Fluid fitting arrangement according to claim 5, wherein the coupling arrangement (110)
is part of an outlet valve (102) of the pump (101).
7. Fluid system, comprising:
- a fluid fitting arrangement according to one of claims 1 to 6, and
- the second part (120), the second part (120) being coupled to the coupling arrangement
(110).
1. Flüssigkeitsrohrleitungsverschraubungsanordnung (100), umfassend:
- einen ersten Teil (101) eines Flüssigkeitssystems und
- eine Kupplungsanordnung (110), wobei die Kupplungsanordnung umfasst:
- ein Rohrelement (111) zum hydraulischen Kuppeln des ersten Teils (101) des Flüssigkeitssystem
mit einem zweiten Teil (120) des Flüssigkeitssystems, wobei das Rohrelement (111)
mit dem ersten Teil (101) des Flüssigkeitssystems hydraulisch gekuppelt ist und mit
dem zweiten Teil (120) des Flüssigkeitssystems hydraulisch kuppelbar ist,
- eine Gewindemuffe (112) zum mechanischen Kuppeln des ersten Teils (101) des Flüssigkeitssystems
mit dem zweiten Teil (120) des Flüssigkeitssystems, wobei die Gewindemuffe mechanisch
mit dem ersten Teil (101) des Flüssigkeitssystems gekuppelt ist und mit dem zweiten
Teil (120) des Flüssigkeitssystems mechanisch kuppelbar ist,
- eine Schweißverbindung (104) zum Kuppeln der Gewindemuffe (112) mit dem ersten Teil
(101), wobei
- das Rohrelement (111) und die Gewindemuffe (112) als einzelne Teile bereitgestellt
sind,
- die Gewindemuffe (112) das Rohrelement (111) koaxial umgibt, und
- die Gewindemuffe (112) radial in einer Entfernung (113) von dem Rohrelement (111)
angeordnet ist,
dadurch gekennzeichnet, dass die
Rohrleitungsverschraubungsanordnung eine Schweißverbindung (103) zum Kuppeln des Rohrelements
(111) mit dem ersten Teil (101) umfasst.
2. Flüssigkeitsrohrleitungsverschraubungsanordnung nach Anspruch 1, wobei die Gewindemuffe
(112) eine längliche hohlzylindrische Form umfasst.
3. Flüssigkeitsrohrleitungsverschraubungsanordnung nach Anspruch 1 oder 2, wobei die
Gewindemuffe (112) ein Gewinde (114) zum mechanischen Koppeln der Gewindemuffe (112)
mit dem zweiten Teil (120) des Flüssigkeitssystems umfasst.
4. Flüssigkeitsrohrleitungsverschraubungsanordnung nach einem der Ansprüche 1 bis 3,
wobei die Gewindemuffe (112) frei von Flüssigkeit ist.
5. Flüssigkeitsrohrleitungsverschraubungsanordnung nach einem der Ansprüche 1 bis 4,
wobei der erste Teil (101) eine Pumpe für die Förderung der Flüssigkeit ist.
6. Flüssigkeitsrohrleitungsverschraubungsanordnung nach Anspruch 5, wobei die Kupplungsanordnung
(110) Teil eines Auslassventils (102) der Pumpe (101) ist.
7. Flüssigkeitssystem, umfassend:
- eine Flüssigkeitsrohrleitungsverschraubungsanordnung nach einem der Ansprüche 1
bis 6, und
- den zweiten Teil (120), wobei der zweite Teil (120) mit der Kupplungsanordnung (110)
gekuppelt ist.
1. Agencement de raccord de fluide (100), comprenant :
- une première partie (101) d'un système de fluide ; et
- un agencement d'accouplement (110), l'agencement d'accouplement comprenant :
- un élément de tube (111) destiné à accoupler de manière hydraulique la première
partie (101) du système de fluide à une seconde partie (120) du système de fluide,
l'élément de tube (111) étant accouplé de manière hydraulique à la première partie
(101) du système de fluide, et pouvant être accouplé de manière hydraulique à la seconde
partie (120) du système de fluide ;
- un manchon fileté (112) destiné à accoupler de manière mécanique la première partie
(101) du système de fluide à la seconde partie (120) du système de fluide, le manchon
fileté étant accouplé de manière mécanique à la première partie (101) du système de
fluide, et pouvant être accouplé de manière mécanique à la seconde partie (120) du
système de fluide ;
- une connexion soudée (104) destinée à accoupler le manchon fileté (112) à la première
partie (101), dans lequel :
- l'élément de tube (111) et le manchon fileté (112) sont prévus en tant que parties
distinctes ;
- le manchon fileté (112) entoure l'élément de tube (111) de manière coaxiale ; et
- le manchon fileté (112) est disposé de manière radiale à une certaine distance (113)
de l'élément de tube (111) ;
caractérisé en ce que l'agencement de raccord comprend une connexion soudée (103) destinée à accoupler
l'élément de tube (111) à la première partie (101).
2. Agencement de raccord de fluide selon la revendication 1, dans lequel le manchon fileté
(112) présente une forme cylindrique creuse allongée.
3. Agencement de raccord de fluide selon la revendication 1 ou la revendication 2, dans
lequel le manchon fileté (112) comprend un filetage (114) destiné à accoupler de manière
mécanique le manchon fileté (112) à la seconde partie (120) du système de fluide.
4. Agencement de raccord de fluide selon l'une quelconque des revendications 1 à 3, dans
lequel le manchon fileté (112) est exempt de fluide.
5. Agencement de raccord de fluide selon l'une quelconque des revendications 1 à 4, dans
lequel la première partie (101) est une pompe destinée à distribuer le fluide.
6. Agencement de raccord de fluide selon la revendication 5, dans lequel l'agencement
d'accouplement (110) fait partie d'une soupape de sortie (102) de la pompe (101).
7. Système de fluide, comprenant :
- un agencement de raccord de fluide selon l'une quelconque des revendications 1 à
6 ; et
- la seconde partie (120), la seconde partie (120) étant accouplée à l'agencement
d'accouplement (110).