NZ720984B2 - Fluid transmission coupler with rear chamber fed by oblique pipe - Google Patents
Fluid transmission coupler with rear chamber fed by oblique pipe Download PDFInfo
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- NZ720984B2 NZ720984B2 NZ720984A NZ72098414A NZ720984B2 NZ 720984 B2 NZ720984 B2 NZ 720984B2 NZ 720984 A NZ720984 A NZ 720984A NZ 72098414 A NZ72098414 A NZ 72098414A NZ 720984 B2 NZ720984 B2 NZ 720984B2
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- New Zealand
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- chamber
- coupler
- female coupler
- assembly
- axis
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- 239000012530 fluid Substances 0.000 title claims abstract description 54
- 230000005540 biological transmission Effects 0.000 title claims abstract description 16
- 230000001808 coupling Effects 0.000 claims abstract description 33
- 238000010168 coupling process Methods 0.000 claims abstract description 33
- 238000005859 coupling reaction Methods 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 2
- 230000036633 rest Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000037250 Clearance Effects 0.000 description 2
- 230000035512 clearance Effects 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000284 resting Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000000295 complement Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
Abstract
Fittings which may be rapidly coupled to one another to connect a fluid feed, by means of rigid pipes or flexible hoses, are frequently required for fluid transmission for example in operating machines and hydraulic equipment. The known quick coupling fittings usually consist of two couplers, named male and female, which are fastened to respective pipes to be joined and which can be coupled together by screwing or by snapping. The currently marketed fluid transmission solutions show that the coupling between the male coupler and the female coupler is not always very easy with effort increasing incrementally as the residual pressure present in the circuit increases. There is provided a fluid transmission coupling assembly comprising a hydraulic feeding block, a female coupler inserted in the hydraulic feeding block, and a male coupler adapted to be coupled with said female coupler. The block includes at least one hydraulic line and a draining line, and a lever integral with a cam adapted to relieve the pressure from a chamber inside the female coupler and adapted to uncouple the male coupler from the female coupler. The female coupler comprises a pressure relief valve which puts said chamber into communication with the draining line. The female coupler comprises a seal adapted to close a calibrated communication pipe. The seal is located between the chamber and the hydraulic line. The calibrated communication pipe is contained in a body of the female coupler external to the chamber with respect to the axis of the assembly, thus generating a pressure difference between the hydraulic line and the chamber. The at least one hydraulic line, in coupled configuration of the assembly, is in fluid connection with the said male coupler through multiple openings provided in the body of the female coupler. The multiple openings are arranged around the axis of the assembly with an oblique axis with respect to the axis of the assembly. The calibrated communication pipe is arranged external to said chamber and having an oblique axis with respect to the axis of the assembly. The seal has an annular shape, and comprises a non-deformable portion and a deformable portion. The deformable portion bends towards the inside of the chamber when a given nominal pressure is reached, thus determining the entrance of the pressurized fluid in the chamber of the hydraulic line. The deformable portion returns to its initial position thus obstructing the passage of fluid when the pressure returns under said nominal pressure. male and female, which are fastened to respective pipes to be joined and which can be coupled together by screwing or by snapping. The currently marketed fluid transmission solutions show that the coupling between the male coupler and the female coupler is not always very easy with effort increasing incrementally as the residual pressure present in the circuit increases. There is provided a fluid transmission coupling assembly comprising a hydraulic feeding block, a female coupler inserted in the hydraulic feeding block, and a male coupler adapted to be coupled with said female coupler. The block includes at least one hydraulic line and a draining line, and a lever integral with a cam adapted to relieve the pressure from a chamber inside the female coupler and adapted to uncouple the male coupler from the female coupler. The female coupler comprises a pressure relief valve which puts said chamber into communication with the draining line. The female coupler comprises a seal adapted to close a calibrated communication pipe. The seal is located between the chamber and the hydraulic line. The calibrated communication pipe is contained in a body of the female coupler external to the chamber with respect to the axis of the assembly, thus generating a pressure difference between the hydraulic line and the chamber. The at least one hydraulic line, in coupled configuration of the assembly, is in fluid connection with the said male coupler through multiple openings provided in the body of the female coupler. The multiple openings are arranged around the axis of the assembly with an oblique axis with respect to the axis of the assembly. The calibrated communication pipe is arranged external to said chamber and having an oblique axis with respect to the axis of the assembly. The seal has an annular shape, and comprises a non-deformable portion and a deformable portion. The deformable portion bends towards the inside of the chamber when a given nominal pressure is reached, thus determining the entrance of the pressurized fluid in the chamber of the hydraulic line. The deformable portion returns to its initial position thus obstructing the passage of fluid when the pressure returns under said nominal pressure.
Description
“Fluid transmission coupler with rear chamber fed by oblique pipe”
* * * *
DESCRIPTION
The present invention relates to a fluid transmission coupler with rear
chamber fed by oblique pipe.
Fittings which may be rapidly coupled to one another to connect a fluid
feed, by means of rigid pipes or flexible hoses, are frequently required for
fluid transmission for example in operating machines and hydraulic
equipment.
The known quick coupling fittings usually consist of two couplers,
named male and female, which are fastened to respective pipes to be joined
and which can be coupled together by screwing or by snapping.
The aforesaid male and female couplers are formed by fixed parts and
axially sliding parts, which at rest are arranged in a closing position of a fluid
passage gap and during the coupling between two members are displaced by
engaging with corresponding parts of the other member to an opening position
of said passage gap.
The currently marketed fluid transmission solutions show that the
coupling between the male coupler and the female coupler is not always very
easy with effort increasing incrementally as the residual pressure present in
the circuit increases.
Italian patent application MI2012A001254 by the present Applicant
concerns a fluid transmission coupling connectable with constant effort
provided with a pressure compensation and relief system which is complex
and not very cost-effective. Said known fitting further comprises a central
locking system which is mechanically cumbersome and ineffective in some
situations of accidental actuating by the user.
US-6016835 and US-2006/0273580 describe a fluid transmission fitting
with a female coupler having a rear chamber fed by a pipe with axis parallel
to the fitting axis.
In this specification where reference has been made to patent
specifications, other external documents, or other sources of information, this
is generally for the purpose of providing a context for discussing the features
of the invention. Unless specifically stated otherwise, reference to such
external documents or such sources of information is not to be construed as
an admission that such documents or such sources of information, in any
jurisdiction, are prior art or form part of the common general knowledge in
the art.
It is an object of the present invention to make a pipe fitting, in which
the effort required for the coupling operation is minimum and independent
from the residual pressure present in the circuit.
It is a further object of the present invention to make the fitting
mechanically simpler and allow a suitable hydraulic control to guarantee user
safety also in the event of accidental actuation.
A yet further object of is that said fitting has a rear chamber which, when
pressurized, allows to maintain the main valve of the female coupler in
position by opposing to the thrust of the fluid coming from the male coupler,
thus guaranteeing the complete opening of valves after coupling the coupler.
An additional or alternative object is to at least provide the public with
a useful choice.
According to the present invention, such objects are reached by means
of a fluid transmission coupling assembly as described in claim 1.
There is provided a fluid transmission coupling assembly comprising a
hydraulic feeding block, a female coupler inserted in the hydraulic feeding
block, and a male coupler adapted to be coupled with said female coupler,
said block including at least one hydraulic line and a draining line, and a
lever integral with a cam adapted to relieve the pressure from a chamber
inside the female coupler and adapted to uncouple the male coupler from the
female coupler, said female coupler comprises a pressure relief valve which
puts said chamber into communication with the draining line, the female
coupler comprises a seal adapted to close a calibrated communication pipe,
the seal located between the chamber and the hydraulic line, the said
calibrated communication pipe being contained in a body of the female
coupler external to said chamber with respect to the axis of the assembly,
thus generating a pressure difference between the hydraulic line and the
chamber, wherein the said at least one hydraulic line, in coupled
configuration of the assembly, is in fluid connection with the said male
coupler through multiple openings provided in the body of the female
coupler, wherein the said multiple openings are arranged around the axis of
the assembly with an oblique axis with respect to the axis of the assembly,
said calibrated communication pipe being arranged external to said chamber
and having an oblique axis with respect to the axis of the assembly, said seal
having an annular shape, and comprising a non-deformable portion and a
deformable portion, the deformable portion bending towards the inside of
the chamber when a given nominal pressure is reached, thus determining the
entrance of the pressurized fluid in the chamber of the hydraulic line and the
deformable portion returning to its initial position thus obstructing the
passage of fluid when the pressure returns under said nominal pressure.
The features of the present invention will be more apparent from the
following detailed description of a non-limitative example thereof shown in
the accompanying drawings, in which:
figure 1 shows a section view taken along line I-I in figure 24 of a fluid
transmission fitting with uncoupled male and female coupler;
figure 1A shows an enlarged detail comprised in circle C in figure 1;
figure 1B shows a section view taken along line B-B in figure 1;
figure 1C shows a section view taken along line C-C in figure 1A;
figure 1D shows a section view taken along line D-D in figure 1A;
figure 2 shows a section view similar to the one in figure 1 of the fitting
in a step of relieving the residual pressure of the hydraulic line before the
coupling between male coupler and female coupler;
figure 2A shows an enlarged detail comprised in circle Y in figure 2;
figure 3 shows a section view similar to the one in figure 1 of the fitting
before the coupling between male coupler and female coupler without
presence of residual pressure in the hydraulic line;
figure 4 shows a section view similar to the one in figure 1 of the fitting
in a first step of coupling between male coupler and female coupler, with
contact of a valve of the male coupler and a valve of the female coupler;
figure 5 shows a section view similar to that in figure 1 of the fitting in
a second step of coupling between male coupler and female coupler, with
displacement of the inner part of the female coupler in the hydraulic feeding
block and opening of the rear pressure relief;
figures 6 and 7 show two section views similar to the ones in figure 1
of the fitting in a third and a fourth step of coupling between male coupler and
female coupler with radial displacement of the locking balls of the female
coupler in the housing of a fixing ring nut;
figure 8 shows a similar view to the one in figure 1 of the fitting in a
fifth step of coupling between male coupler and female coupler, with
positioning of the locking balls within a recess present on the male body;
figure 9 shows a similar view to the one in figure 1 of the fitting in a
sixth step of coupling between male coupler and female coupler, with
displacement of the outer assembly with locking balls to the locking position
of the male coupler;
figure 10 shows a section view similar to the one in figure 1 of the fitting
in a seventh step of coupling between male coupler and female coupler, with
opening of the male valve by effect of the hydraulic thrust caused by the
feeding of the circuit;
figures 11 and 12 show section views similar to the ones in figure 1 of
the fitting in a first and a second step of uncoupling between male coupler and
female coupler, with pressure relief and closing of the male valve;
figure 13 shows a section view similar to the one in figure 1 of the fitting
in a third step of uncoupling between male coupler and female coupler, with
displacement of the inner parts until the locking balls are released;
figure 14 shows a section view similar to the one in figure 1 of the fitting
in a fourth step of uncoupling between male coupler and female coupler, with
releasing of the male coupler;
figure 15 shows a section view similar to the one in figure 1 of the
fitting, with male coupler and female coupler uncoupled;
figure 16 shows an enlarged detail of the content of circle W in figure
figure 17 shows a section view taken along line XVII-XVII in figure 16;
figure 18 shows an enlarged detail of the content of circle U in figure 2;
figure 19 shows a section view taken along line XIX-XIX in figure 18;
figure 20 shows an enlarged detail of the content of circle Z in figure
figure 21 shows a section view taken along line XXI-XXI in figure 20;
figure 22 shows an enlarged detail of the content of circle V in figure
figure 23 shows a section view taken along line XXIII-XXIII in figure
figure 24 shows a front view of the fitting according to the present
invention;
figure 25 shows a section view similar to the one in figure 1 of the fitting
in a step of relieving of the residual pressure before the coupling between male
coupler and female coupler of the lower hydraulic line.
Figure 1 shows a coupling fitting 100 comprising a female valve coupler
47 inserted in a hydraulic feeding block 1 and a male valve coupler 48 which
can be coupled to said female coupler 47.
The block 1, which feeds the fluid, comprises at least one hydraulic line
49 and a draining line 50, both interfacing with one or more female couplers
47.
In the description of the operation, reference will be made to only one
male-female line (the one shown on the top in the drawings), but the
considerations are applicable to all lines of a same fitting. It is worth noting
that in the drawings the female coupler in the lower line is not shown in
section but only as a view, the section being identical to that of the upper line.
The block 1 further comprises a lever 4 integral with a cam 7 adapted to
relieve the pressure from a chamber 54 inside the female coupler 47, and
adapted to uncouple the male coupler 48 from the female coupler 47.
The cam 7 consists of two independent parts, an upper one 82, which
acts on the coupling of the upper hydraulic line, and a lower one 83, which
acts on the coupling of the lower hydraulic line (figure 1)
The cams 82, 83 each have a disc-shaped attachment portion 821, 831
(figures 16-23) assembled on a central shaft 5 with a substantially rectangular
section with rounded short sides 501 (figure 16) so as to allow the rotation of
said shaft 5 in loops 822, 832 of said attachment portions 821, 831.
The rotation of the central shaft 5 is controlled by applying stress to the
lever 4, which moves the attachment portion 821 of the upper cam 82
clockwise, but being free in the second loop 832 it does not move the
attachment portion 831 of the lower cam 83, and moves the attachment portion
831 of the lower cam 83 anticlockwise but by being free in the loop 822 it
does not move the attachment portion 821 of the upper cam 82.
The shape of said loops 822, 832 is substantially complementary to the
shape of the central shaft 5, but their width is greater to allow a rotation
clearance such to be able to move one cam 82 while maintaining the other 83
stationary, and vice versa, as will be more apparent below.
The cams 82, 83 are held in position by means of a stop of the block 1
and the head of the shutter 25 which is pushed, in turn, into position by the
spring 84. The central shaft 5 is integral with the lever 4, in turn.
The female coupler 47 comprises a pressure relief valve 51 which puts
said chamber 54 into communication with the draining line 50 (figure 1).
Said valve 51 comprises a valve body 23, which forms a housing for a
sliding shutter 25, stressed by a spring 84, which reacts against a protrusion
of the head of the shutter 25 and a valve body 23.
The valve body 23 also contains a hollow body 72 which integrally
surrounds an inner portion of the shutter 25.
The sealing is ensured by the contact between a seal 251 of the shutter
and a conical seat 231 of the valve body 23 (figure 1A).
The member 72 has an annular portion 721 with three cavities at 120°
for the passage of the fluid and is in contact with the seal 251 which co-
operates to sealing the body valve 23.
Between the upper cam 82 and the head of the shutter 25 there is a slight
clearance to guarantee that the shutter is in the closed position when the cam
7 is not actuated.
The shutter 25 has therein a hole 252 (figure 2) for venting the air and a
hydraulic thrust section reduced to the minimum. Such a hydraulic thrust
section is determined by the interface diameter between the sealing diameter
of the seal 251 and the valve body 23, and by the diameter of slightly smaller
size of the member 72 on which a seal 28 acts. The described configuration
of the shutter 25 - valve body 23 coupling allows to minimize the actuation
force of the shutter 25 itself in presence of residual pressure present inside the
chamber 54.
The female coupler 47 further comprises a valve 52 axially sliding
inside an outer assembly 53 of the female coupler 47 itself, and a seal 19
adapted to generate a pressure difference between the hydraulic line 49 and
the chamber 54.
Said seal 19 is adapted to close a calibrated communication pipe 191
between the chamber 54 and the hydraulic line 49; said pipe 191 is contained
in a body 13 external to said chamber 54 with respect to the axis α of the fitting
100 (figure 2).
Said seal 19 is ring-shaped, determines a radial type sealing, i.e.
orthogonal to the axis α of the fitting 100, and comprises a non-deformable
portion 192 and a deformable portion 193 (detail Y in figure 2).
Said pipe 191 is external to the chamber 54 and the pressurized fluid
flow inside it insists radially outwards from the inside of the chamber 54 at an
annular gap 73 extending on the entire circumference of the valve body 23
(detail C in figure 1).
Furthermore, it is worth noting that said pipe 191 is oblique, i.e. has
axis β oblique with respect to the axis α of the fitting 100 thus determining a
sealing of the radial type of the seal 19 inwards from the outside towards the
axis α of the fitting 100.
The chamber 54 is comprised between the bottom 16 by means of the
seal 17 and the conical seat of the valve body 231 by means of the seal 251
placed on the shutter 25 (detail C in figure 1).
When actuated by the cam 82, the shutter 25 opens and releases the fluid
from the chamber 54 to the draining line 50. A ring 64 is placed within the
chamber 54 which supports a seal 19 and is externally integral with a hollow
body 641 in which the shutter 25 slides with a member 72. The sealing is
guaranteed here by the seal 28.
Said hollow body 641 is axially stressed by a spring 22 and has a ring-
shaped end 644 where the ring 64 rests.
The ring 64, in addition to having the function of supporting the seal 19
also has the function of making the fluid pass through holes 65 only in the
upper side of the chamber 54 by virtue of the fact that there is a cavity 67 for
passing only in that point (figure 1A).
Indeed, the ring 64 abuts on the bottom on the valve body 23, while the
cavity 67, which keeps the ring 64 and the valve body 23 at distance without
contact, remains on the top. It is thus apparent that the valve body 23 is
asymmetric to allow the passage of fluid only on top, so as to limit the
emptying of the chamber 54.
The cavity 67 on the upper top side of the chamber 54, is opposed by
180° with respect to the fluid inlet pipe 191, which, as mentioned, is placed
on the lower side of the chamber 54.
The position of said cavity 67 with respect to the pipe 191 is guaranteed
for the timing of the valve body 23 with the body 13 by means of a pin 62
(figure 1C) and a timing ring 60 (figure 1B), which has a timing surface 68
which interacts with the body 13.
The timing ring 60 also allows the timing with respect to the block 1,
because it comprises a timing protrusion 601 adapted to couple with a timing
seat 61 of the block 1.
The body valve 23 is locked by the ring nut 63. Functionally, the fluid
enters into the chamber 54 from the bottom by means of the pipe 191 and after
having opened the shutter 25 exits from the top through the cavity 67 always
keeping the chamber filled to a level 66 corresponding to the diameter 69 of
the valve body 23. In absence of the system described above, once the shutter
25 opens, the fluid would pass from the chamber 54 to the draining line 50
emptying the chamber 54 to level 70 (detail C in figure 1). Keeping the
chamber 54 filled with fluid to level 66 has the advantage of limiting the
presence of air, thus the chamber full of fluid is incompressible and the bottom
16 is held in position as shown below. A further advantage is that by having
the chamber 54 full of fluid to level 66, its complete filling is faster,
particularly when the fluid arrives from male coupler to female coupler.
When a given nominal pressure of the hydraulic line 49 is reached, the
fluid passes through the pipe 191, enters into the annular gap 73, is distributed
on the entire circumference and makes the deformable portion 193 bend
towards the inside of the chamber 54 thus determining the entrance of
pressurized fluid into the chamber 54 from the hydraulic line 49. When the
pressure returns under said nominal pressure, the deformable portion 193
returns to its initial position thus obstructing the passage of fluid in the
opposite direction. The features of the chamber 54 and of the seal 19 described
above can be used with identical operating principle also in case of flat-faced
male-female couplers.
The outer assembly 53 (figure 1) comprises a ring nut holder 29, a ring
nut 30 and at least one locking ball 32 arranged inside a housing of the ring
nut holder 29. A spring 31, by reacting against appropriate protrusions 292,
302, against the ring nut 30, the spacer 37 and the ring 60, constrains the outer
assembly 53 in a central resting position which guarantees the locking of the
male coupler 48 after the coupling.
A bottom 16 also slides inside the female coupler 47 and has two seals
14 and 17 (figure 9) on the side of the hydraulic line 49 and on that of the
chamber 54, respectively. The zone comprised between the two seals 14, 17
is in contact with the draining line 50 by means of the pipe 56. The bottom 16
is held in position by a spring 22.
The male coupler 48 is shown, in turn, in figure 1 and comprises a
threaded male body 41 for connecting to a user (not shown), e.g. to a hydraulic
equipment. There is a valve 451 held in position by a spring 44 which acts on
a bottom 42 within the male body 41. Such a valve 451 guarantees the sealing
of the male coupler 48 in uncoupled condition.
Residual pressure may be present in one or more of the hydraulic lines
49 in operation. By moving the lever 4 rightwards, the upper cam 82 is
actuated and pushes the head of the shutter 25, putting the hydraulic line 49
into connection with the draining line 50 allowing to relieve the inner residual
pressure (figure 2). During such a function, the seal 19 is deformed at the
deformable portion 193 allowing the passage of fluid through the pipe 191.
From the hydraulic line 49 to the draining line 50, the fluid always passes
through the chamber 54 in the cavity 67 placed on the upper side, thus
maintaining the chamber 54 always full of fluid to level 66. During this step,
the lower cam 83 does not move because the shaft 5 by rotating rightwards
meets a side of the loop 822 of the upper cam 82 feeding it, while the loop
832 of the attachment portion 831 is sufficiently wide to make the shaft 5
rotate without touching any of its sides (figures 18-19).
The force applied by the lever 4 must be such to overcome the resistance
of the spring 84, which holds the shutter 25 in position.
Having relieved the residual pressure inside the line 49, the system is
ready for coupling.
The first coupling step (figure 4) consists in pushing the male coupler
48 into the female coupler 47. Residual pressure may be present in the
chamber 57 upstream of the valve 451. The valve 451 comes into contact with
the valve 52 by approaching the male coupler 48 to the female coupler 47. In
absence of residual pressure in the chamber 57, the load of the springs 21 and
44 is equivalent and both valves 451, 52 are displaced. Only valve 52 is
displaced in case of pressure in the chamber 57. By pushing the male coupler
48 into the female coupler 47, the male body 41 goes into contact with the
balls 32, thus displacing the outer assembly 53 into the block 1 (figure 5).
During the displacement, the head of the shutter 25 goes into contact with the
upper cam 82, which, in turn, goes into contact with the block 1. Thus, the
shutter 25 opens and turns the hydraulic line 49 into an open circuit. This
function allows to relieve the pressure during coupling even if the lever 4 is
not operated in advance. The upper cam 82 is not free to move with the shutter
in the opening position.
Proceeding with the insertion of the male coupler 48 in the female
coupler 47 (figures 6-7), the locking balls 32 enter into the seat 301 of the ring
nut 30 thus allowing the entrance of the male coupler 48 until the locking balls
32 fall into the cavity 411 obtained in the male body 41 (figures 8-9).
In this position, the spring 31 returns the assembly consisting of the
outer assembly 53 and the male coupler 48 to the coupled balanced position
by working on the shoulder 292 of the lock ring holder 29 (figure 9). In case
of absence of pressure in the chamber 57, as mentioned above, the bottom 16
is not moved and is held in position by the spring 22, and the valve 451 is
retracted; in this case the circuit is open and the coupler is coupled as shown
in figure 9.
The bottom 16 retracts instead in case of pressure in the chamber 57.
The manual mechanical coupling operation is complete at this point; the
male coupler 48 is mechanically coupled to the female coupler 47, but by
virtue of the fact that the bottom 16 was moved towards the inside of the
female coupler 47, the valve 451 which retains the residual pressure of the
male coupler 48 is still not open. Thus, the effort required for the coupling
operation is independent from the residual pressure present inside the male
coupler 48 because it does not work on the valves which retain the residual
pressure.
For opening the valve 451, in case of pressure in the chamber 57, it is
necessary to send a pressure pulse from the hydraulic line 49, which by
passing through the pipe 191 deforms the deformable portion 193 of the seal
19, fills the chamber 54 and pushes the bottom 16 which acts on the valve 52,
which opens the valve 451, the thrust section of the bottom 16 being higher
than that of the valve 451. During the movement of the bottom 16, the air
contained in the chamber comprised between the seals 17 and 14 may enter
and exit through the pipe 56 (figure 10).
The circuit totally opens when the bottom 16 abuts on the body 13
(again in figure 10). By virtue of the fact that the chamber 54 is always kept
at nearly full level 66 to minimize the presence of compressible air, once filled
with pressurized oil the movement of the bottom 16 is no longer permitted
except for a movement of the shutter 25 because the seal 19 does not allow
the return of fluid towards the hydraulic line 49. The presence of compressible
air would make the bottom 16 retract and consequently close the valve 451 of
the male coupler 48.
The uncoupling between male coupler 48 and female coupler 47 starts
by acting on the lever 4 (figure 11) which moves the upper cam 82, according
to the same methods as the initial relieving described above shown in figures
2, 18 and 19, which acts on the head of the shutter 25 putting the hydraulic
line 49 into communication with the draining line 50, thus discharging the
pressure inside them. In case of pressure and possible flow in the hydraulic
line 49 (e.g. caused by a load applied upstream of the male coupler), by
actuating the shutter 25 there is a drop of pressure in the chamber 54, while
the presence of the seal 19 and of the calibrated pipe 191 causes a higher
pressure in the hydraulic line 49, which acts on the seal 14 causing a thrust on
the bottom 16, which overcomes the spring 22 and thus moves the bottom 16
itself, the valve 52 and the valve 451 which close (figure 12).
Continuing the movement, the upper cam 82 pushes the head of the
shutter to act on the valve body 23, which in turn moves the whole formed by
female coupler 47 and male coupler 48 outwards to the locking balls 32 with
the recess 303 on the fixing ring nut 30. In such a position, the locking balls
32 exit from the recess 411 in the male body 41 and release it letting it out
(figures 13-14).
It is worth noting that the loop 832 of the lower cam 83 is sufficiently
wide to allow a double movement of the upper cam 82 at the end of the second
movement, the shaft 5 nearly abutting onto a side of said loop 832 (figures
-21).
The unrestrained male coupler 48 is uncoupled by effect of the thrust of
the inner springs. Having released the balls 32, the spring 31 returns the
female coupler 47 to the resting position by working on the spacer 37 (figures
and 1).
The system is ready for a new connection.
The female coupler 47 coupled by means of the locking balls 32 is fed
outwards when coupled, if the male coupler 48 is pulled. When the locking
balls 32 reach the recess 303 of the ring nut 30, the male coupler 48 is
uncoupled (accidental uncoupling, “breakaway” function).
The engagement of the lower line is similar to that of the upper line it
being worth noting that the lever 4 moves leftwards in opposite sense (figure
27): the interaction between the shaft 5 and the attachment portion 831 of
the lower cam 83 is similar to that described above for the attachment
portion 821 of the upper cam 82, in which the loop 822 allows the rotation
of the attachment portion 831 of the lower cam 83 without moving the upper
cam 82.
The term ‘comprising’ as used in this specification and claims means
‘consisting at least in part of’. When interpreting statements in this
specification and claims which include the term ‘comprising’, other features
besides the features prefaced by this term in each statement can also be
present. Related terms such as ‘comprise’ and ‘comprised’ are to be
interpreted in a similar manner.
Claims (7)
1. A fluid transmission coupling assembly comprising a hydraulic feeding block, a female coupler inserted in the hydraulic feeding block, and a male coupler adapted to be coupled with said female coupler, 5 said block including at least one hydraulic line and a draining line, and a lever integral with a cam adapted to relieve the pressure from a chamber inside the female coupler and adapted to uncouple the male coupler from the female coupler, said female coupler comprises a pressure relief valve which puts said 10 chamber into communication with the draining line, the female coupler comprises a seal adapted to close a calibrated communication pipe, the seal located between the chamber and the hydraulic line, the said calibrated communication pipe being contained in a body of the female coupler external to said chamber with respect to the axis of the 15 assembly, thus generating a pressure difference between the hydraulic line and the chamber, wherein the said at least one hydraulic line, in coupled configuration of the assembly, is in fluid connection with the said male coupler through multiple openings provided in the body of the female coupler, wherein the 20 said multiple openings are arranged around the axis of the assembly with an oblique axis with respect to the axis of the assembly, said calibrated communication pipe being arranged external to said chamber and having an oblique axis with respect to the axis of the assembly, said seal having an annular shape, and comprising a non-deformable 25 portion and a deformable portion, the deformable portion bending towards the inside of the chamber when a given nominal pressure is reached, thus determining the entrance of the pressurized fluid in the chamber of the hydraulic line and the deformable portion returning to its initial position thus obstructing the passage of fluid when the pressure returns under said 30 nominal pressure.
2. An assembly according to claim 1, wherein the calibrated communication pipe leads into an annular gap situated on the valve body so as to protect the seal from the direct flow coming from the pipe.
3. An assembly according to claim 1, wherein said valve comprises a valve 5 body, a sliding shutter and a spring, said valve body forming a housing for the sliding shutter stressed by the spring which reacts against a protrusion of the head of the shutter and the valve body, said valve body also containing a hollow member which integrally envelops an inner portion of the shutter, the sealing being ensured by the 10 contact between a seal of the shutter and a conical seat of the valve body, a ring, externally integral with a hollow body within which the shutter slides with the hollow member, being placed inside the chamber, said hollow body having a ring-shaped end in which the ring rests so that the fluid moves axially towards the draining line only from the upper 15 side of the chamber through a cavity, said ring abutting on the bottom on the valve body.
4. An assembly according to claim 3, wherein the hollow member has an annular portion with three cavities at 120° for the passage of the fluid and is contact with the seal which collaborates with the sealing on the valve 20 body.
5. An assembly according to claim 3 or 4, further comprising a pin and a timing ring which includes a timing surface which interacts with a body, the position of the cavity with respect to the pipe is guaranteed for the timing of the valve body with the body by the pin and the timing ring. 25
6. An assembly according to claim 5, wherein the timing ring allows the timing with respect to the block, because the timing ring comprises a timing protrusion adapted to couple with a timing seat of the block.
7. An assembly according to claim 1, substantially as herein described 30 with reference to any embodiment disclosed.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT001864A ITMI20131864A1 (en) | 2013-11-11 | 2013-11-11 | ENGAGEMENT FOR TRANSMISSION OF FLUIDS WITH RADIAL GASKET. |
PCT/IB2014/065922 WO2015068141A2 (en) | 2013-11-11 | 2014-11-10 | Fluid transmission coupler with rear chamber fed by oblique pipe |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ720984A NZ720984A (en) | 2021-06-25 |
NZ720984B2 true NZ720984B2 (en) | 2021-09-28 |
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