Quick coupler for two-way check valve and fluid coupling device comprising two such quick couplers

Abstract

A quick coupling comprising a tubular body (3) having an outer surface (19), an inner cavity and a valve seat (18), an expansion body (2) having an axial fluid flow passage (14) therethrough and an outer sleeve surface (20), and a valve comprising a valve ball (4), a valve stem (1) and a compression spring (6) wherein the outer sleeve surface (20) of the expansion body (2) is oversized relative to the inner receiving cavity of the tubular body (3), the valve rod (1) is provided with a spring (6) for generating an outward force on an outer sleeve surface (19) of the tubular body (3) upon introduction of the tubular body (3), in which the valve ball (4) is positioned between the spring (6) and the valve rod (1), in which the spring (6) is positioned to pre-tighten the valve ball (4) relative to the valve seat (18), and in the event that any pressure against the valve ball (4) from the direction of the valve rod (1) is below a predetermined threshold, the valve rod (1) is pressed against the valve seat (18). The valve rod (1) extends beyond the front surface of the tubular body (3) when the valve ball (4) is in contact with the valve seat (18), and wherein the axial fluid flow passages (12, 13) through the quick coupler are opened when the valve rod (1) is pushed in the direction of the valve ball (4) such that the front surface of the valve rod (1) is flush with the front surface of the tubular body (3).

Description

Technical Field

[0001] The invention relates to a quick coupler for a two-way check valve and a fluid coupling device comprising two quick couplers. Background Art

[0002] WO 03 / 087638A1 discloses a two-way check valve for controlling fluid movement. The valve body has an opening on one side of the valve, another opening on the opposite side of the valve, and a channel connecting the opening and the other opening. A movable lift valve defines a cavity and is arranged in the channel of the valve body. A spring is coupled to the movable lift valve. Another lift valve is arranged in the cavity, and another spring is coupled to the movable lift valve and the other lift valve, and the other spring is opposite to the spring. When the fluid passes through the opening in the valve body and applies a force greater than the spring force to the movable lift valve, another portion of the outer surface of the movable lift valve is guided away from another portion of the channel wall and allows the fluid to flow from the opening in the valve body through the pipeline to the other opening in the valve body. When fluid passes through the additional opening in the valve body and applies a force on the additional poppet valve that is greater than the additional spring force, another portion of the outer surface of the additional poppet valve is directed away from the additional opening in the valve body to open the additional conduit in the movable poppet valve and allow fluid to flow from the additional opening in the valve body through the additional passage and multiple folds or recesses in the outer surface of the additional poppet valve to the opening of the valve body.

[0003] US2017 / 191595 A1 discloses a coupling device including a coupler and a joint. The joint has a valve in a normally closed position and an outer peripheral surface with a plurality of spaced closed-end cam paths. The coupler has a valve in a normally closed position and includes a set of locking balls for engaging with the cam path to secure the coupler to the joint. The coupler also includes a sleeve mounted thereon, which can move between an advanced position and a retracted position. In the advanced position, the locking ball is forced into an inward position that prevents the locking ball from disengaging from the cam path; in the retracted position, the locking ball is allowed to extend to an outward position that can initially engage or disengage with the cam path. The coupler also includes a set of locking balls for preventing the sleeve from moving to the retracted position.

[0004] In addition, US 6,354,564 B1 discloses a ball-stop fluid coupling for liquid and gas applications, which has a ball-retaining sleeve on the socket that can be retracted by hand for connecting and disconnecting the socket and the plug, and includes a pressure-actuated check valve mounted on a valve guide within the flow path to prevent backflow to the supply side of the coupling. The valve is also used to shut off the flow when the mating parts of the coupling are disconnected or the flow through the coupling is shut off. A conventional valve can be installed in the fluid flow channel opposite the pressure-actuated check valve to cause the mating plug and socket to decouple and stop the flow in the discharge line when the sleeve releases the ball stop from engagement with the plug.

[0005] US 5,540,250 A discloses another ball stop fluid coupling for appliances and the like having a push to connect feature and a pull to disconnect feature as well as a thermally responsive disconnect feature.

[0006] EP 1 148 285 A2 discloses a quick-acting fluid coupling device for connecting two fluid-conducting circuits, the quick-acting fluid coupling device comprising a plug for attaching to one of the circuits and a socket for attaching to the other of the circuits. The socket has a tubular body and includes a valve having a valve sleeve and a fixed valve stem coaxially arranged in the tubular body. When the plug and the socket are connected, the valve sleeve moves axially to open a fluid flow channel between the valve sleeve and the valve stem. The outer surface of the valve stem defines a plurality of circumferentially spaced recesses therein. The circumferential recess is defined in the inner surface of the tubular body and is radially spaced outwardly from the recess in the valve stem and is axially aligned with the recess in the valve stem. A plurality of separately formed discrete retaining elements are respectively partially engaged in the recess of the valve stem and partially engaged in the recess of the tubular body. Each retaining element is captively retained between the forward and rearward inclined surfaces of the corresponding recess and between the forward and rearward inclined surfaces of the recess. Thus, the retaining element cooperates with the surfaces of the recess and the recess to prevent the valve stem from axial movement. The plug includes a valve member that slides to an open position by engaging a valve stem of the socket when the plug is inserted into the socket.

[0007] Other documents related to this technical field include EP 2 376 741 B1, US 1,331,720 A and GB 2,571,933. Summary of the invention

[0008] Based on this prior art, the object of the present invention is to provide a quick coupler for a fluid conducting line which can be easily used in a fluid coupling device.

[0009] The quick coupler comprises: a tubular body having an outer sleeve surface, an inner receiving cavity, an axial fluid flow passage therethrough and a valve seat; an expansion body having an axial fluid flow passage through the expansion body and an outer sleeve surface; and a valve including a valve ball, a valve stem and a compression spring. The outer sleeve surface of the expansion body is oversized relative to the inner receiving cavity of the tubular body to generate an outward force on the outer sleeve surface of the tubular body when the tubular body is introduced. The valve ball is positioned between the spring and the valve stem, wherein the spring is positioned to preload the valve ball relative to the valve seat and close the axial fluid flow passage through the quick coupler when any pressure on the valve ball from the direction of the valve stem is below a predetermined threshold, wherein when the valve ball contacts the valve seat, the valve stem extends beyond the front surface of the tubular body, and wherein when the valve stem is pushed in the direction of the valve ball so that the front surface of the valve stem is flush with the front surface of the tubular body, the axial fluid flow passage through the quick coupler is opened, wherein the spring and the valve ball are at least partially positioned in a cylindrical housing attached to the tubular body.

[0010] The valve stem may have a flange having a diameter larger than the guide hole of the expansion body.

[0011] The housing may have a side opening near the attachment portion to the tubular body to allow the fluid ball to pass through the valve ball to exit the housing.

[0012] The housing may have a first inner diameter near the attachment portion to the tubular body and a second inner diameter on the opposite side of the attachment portion to the tubular body, the first inner diameter being adapted to accommodate and guide the valve ball and the second inner diameter being adapted to accommodate and guide the spring.

[0013] The housing may then have an open bottom surface and / or side openings at a portion along which the housing has the second diameter.

[0014] Furthermore, the first diameter may be greater than the second diameter, and a tapered section may be provided between the two portions of different diameters.

[0015] The axial fluid flow passage inside the expansion body may comprise at least one, preferably a plurality of, axial through holes in the expansion body at a radial distance from the longitudinal axis of the expansion body.

[0016] A fluid coupling device for a fluid guide line includes: a first quick coupler and a second quick coupler according to the present invention, and a male hydraulic connector and a female hydraulic connector. The male hydraulic connector has an axial fluid flow passage through the male hydraulic connector, a receiving cavity having the diameter of the tubular body of the first quick coupler, and has a rear end and an opposite front end for connecting with the first fluid guide line, and includes a coupling end. The female hydraulic connector has an axial fluid flow passage through the female hydraulic connector, including a receiving cavity having the diameter of the tubular body of the second quick coupler, and has a rear end and an opposite front end for connecting with the second fluid guide line and a receiving cavity for the coupling end of the male hydraulic connector. The first quick coupler and the second quick coupler are positioned in the male hydraulic connector and the female hydraulic connector, respectively, and when the expansion body of the quick coupler is fully positioned in the corresponding quick coupler, the front surface does not extend beyond the front surface of the male hydraulic connector or the inner wall surface of the receiving cavity of the female hydraulic connector. The male hydraulic connector and the female hydraulic connector are configured so that the front end of the male hydraulic connector can be axially inserted into the front end of the female hydraulic connector to establish a continuous fluid flow path between the hydraulic connectors.

[0017] Such a fluid coupling device may have a male hydraulic connector including a connection device, in particular a screw, and a female hydraulic connector. In one coupling system, the fixing of the male connector to the female connector is achieved by a tightening screw placed on one side of the connector. This may introduce an angle of inclination in the opening force applied to the non-return valve, making it impossible to align it perfectly along the longitudinal axis of symmetry. In a different solution, a linear axisymmetric geometry of the connector is chosen, in which the engagement of the cylindrical surfaces of the male and female connectors and the axisymmetric engagement of the threads on the nut (as part of the connection device) with the complementary threads on the female connector ensure that the opening force is applied in a perfectly straight line along the longitudinal axis of symmetry.

[0018] Further embodiments of the invention are defined in the dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, which are used to illustrate the preferred embodiments of the present invention, but not to limit the present invention.

[0020] Figure 1 A schematic cross-sectional view showing a fluid control element in a closed position of a valve when uncoupled according to an embodiment of the present invention;

[0021] Figure 2 shows when the valve is in the open position, i.e. when the fluid control element is coupled, Figure 1 A schematic cross-sectional view of a fluid control element;

[0022] Figure 3Two male and female hydraulic connectors facing each other positioned in a two-way check valve are shown according to Figure 1 A schematic cross-sectional view of a fluid control element;

[0023] Figure 4 Shows when the two-way check valve is closed Figure 3 A schematic cross-sectional view of;

[0024] Figure 5 showing a view of the front surface of a fluid control element;

[0025] Figure 6 Shows Figure 1 A three-dimensional view of a fluid control component;

[0026] Figure 7 Two pairs of male and female hydraulic connectors facing each other with two-way check valves positioned in front of each other are shown. Figure 1 A schematic cross-sectional view of a fluid control element; and

[0027] Figure 8 Shown when the other two-way check valve is closed Figure 7 Schematic cross-sectional view of . DETAILED DESCRIPTION

[0028] Figure 1 A schematic cross-sectional view of a fluid control element in accordance with an embodiment of the present invention when uncoupled is shown in a closed position of the valve. Figure 2 1 shows when the valve is in the open position, ie when the fluid control element 100 is coupled, Figure 1 Schematic cross-sectional view of the fluid control element 100. It should be noted that Figure 1 and Figure 2 The fluid control element 100 is shown with a fully inserted expansion pin 2 which effectively prevents the fluid control element 100 from being removed from the corresponding female or male hydraulic connector 22, 23 into which it is functionally inserted.

[0029] The fluid control element 100 according to the invention is a quick coupling element to be inserted into a coupling member, in particular a hydraulic connector 200 of a male hydraulic connector 23 and a female hydraulic connector 22 at a junction between two hoses 25, 25' or inside a hydraulic system, as will be shown in FIG. Figure 3 and Figure 4 , the fluid coupling element 100 is shown in a fully inserted state as described below.

[0030] The quick coupling element 100 comprises a sleeve-shaped or tubular base 3, an expansion pin 2, a sealing ball 4, a loading spring 6, a housing 5 for the loading spring 6 and the sealing ball 4, and an opening piston 1. All these elements are arranged around the longitudinal axis 10 of the quick coupling element 100, which is also the longitudinal axis 10 of the female hydraulic connector 22 and the male hydraulic connector 23. The tubular base 3 comprises a shoulder 31 with reduced diameter and a matching curved seat 18 for the sealing ball 4, in which a receiving part for the housing 5 is arranged. On the outside of the receiving part for the housing 5, a circumferential extension 37 or a plurality of longitudinal extensions around the circumference is arranged, which is bent towards the center line 10 to fix the position of the housing 5.

[0031] The housing 5 is a hollow cylinder with a diameter to accommodate the loading spring 6. It may have an open bottom and / or side openings along the spring 6. The diameter of the housing 5 may be increased to accommodate a sealing ball 4 having a larger diameter than the spring 6. Since the ball 4 is guided to move longitudinally against the force of the spring 6 through the housing, by the push of the opening piston, at least one side duct 11 is provided to allow the fluid entering through the coaxial cavity 12 to flow around the ball 4 and leave the housing 5.

[0032] Two identical quick coupling elements 100 can be inserted inside the mounting holes 30, 30' of two hydraulic connectors 23, 22 of a hydraulic connector 200, which has a shoulder section or stepped section 26, 26' with a limited diameter, allowing installation from one side of the outer surface 27, 27' of the hydraulic connector 23, 22. During installation, when the stepped feature or shoulder 31 of the base 3 contacts the opposite stepped feature or shoulder 26, 26' of the mounting holes 30, 30', the thrust applied to the expansion pin 2 allows the element to be inserted inside the base 3, thereby generating an outward radial force, resulting in plastic expansion of the inner wall 20 of the hollow portion of the base 3. This plastic deformation is transmitted to the outer surface 19 of the base 3, which is tightly pressed against the hole surfaces 32, 32' of the corresponding male hydraulic connector 22 and female hydraulic connector 23, so that in Figure 3 and Figure 4 In the fully mounted state shown, anchoring and sealing functions are provided between the outer surface 19 of the base 3 and the bore walls 32, 32' of the respective male and female hydraulic connectors 22, 23. The front surface 38 of the base 3 is then flush with the aforementioned front surfaces of the hydraulic connectors 23, 22, respectively; therefore, reference numerals 38 and 27 are used to indicate the central vicinity and central distance portions of this front surface.

[0033] The closed position of the quick coupling element is Figure 1 and Figure 3In this closed state, the spring 6 pushes the ball 4 toward the base 3, and the thin spherical segment of the ball 4 contacts the corresponding thin spherical segment 18 on the base 3 with a matching radius of curvature. Figure 3 In the configuration shown, a fluid, in particular a liquid, is present in the circuit 25, 25' at a defined pressure and exerts a pressure, called a back pressure, on the back side of the quick coupling element 100. This back pressure presses the ball 4 tightly against the thin ball section 18 of the base 3, thereby providing a sealing function and zero leakage of the liquid. In this configuration, the opening piston 1 does not produce any resistance to the movement of the ball 4 and is located Figure 1 The rest position is shown. Compared to prior art solutions, the quick coupling element 100 has reduced dimensions, making it suitable for high pressure applications and achieving a liquid-tight seal without the use of any plastic O-rings.

[0034] The quick-coupler is in the open position. Figure 2 and Figure 4 This occurs when a male hydraulic connector 23 with an inserted and expanded quick coupling element 100 is mated with a female hydraulic connector 22 with another oppositely facing quick coupling element 100 inserted and expanded. In this configuration, the outer surface 34 of the male connector 23 and the inner surface 33 of the female connector 22 together form a guide system that forces the two oppositely facing quick coupling elements 100 to align along their common main longitudinal symmetry axis 10, which in turn is also aligned with the inner surface 34 of the female connector 22. Figure 4 The main longitudinal symmetry axes 10 of the male connector system 23 and the female connector system 22 in the plugged state coincide.

[0035] During the transition from closed to open, when the male connector 23 and the female connector 22 are plugged together, as shown in FIG. Figure 3 and Figure 4 As shown in the transition between, the outermost front surface 21 of the piston 1 is the first element in contact with each other in the quick coupling device 100. Further connecting the two plugs 23 and 22 to the final position where the front 27 of the male connector 23 contacts the rear 27' of the female connector 22 will cause the ball 4 to be pushed back through the contact surface 16 between the ball 4 and the piston 1, thereby causing the spring 6 in the housing 5 to compress and put the two opposing quick coupling elements 23 and 22 in a fully open state, as shown in FIG. Figure 4 As shown. The expansion pin 2 has a central hole 17 which guides the piston 1 during its forward and backward movement so that the piston 1 is always centered on the main longitudinal symmetry axis 10 of the quick coupling element 100. This is achieved due to the tolerance between the diameter of the middle section 8 of the piston 1 and the diameter of the central hole 17 of the expansion pin 2. Figure 2In the figure, the reference numeral 17 of the center hole seems to indicate the cylindrical surface facing the opening piston 1, but there is a sliding tolerance distance between the piston 1 and the expansion pin 2. This guidance ensures the functional reliability of the quick coupling element 100 in multiple opening and closing cycles by ensuring reliable contact between the piston rear surface 16 and the front surface of the ball, symmetrically centered relative to their common symmetry axis 10.

[0036] Thanks to the large diameter of the front section of the piston 1 and the flange 9, the contact surface 21 of the part of the piston 1 responsible for opening the quick coupling element is increased, thereby also enhancing the reliability of the quick coupling opening and closing mechanism. The flange 9 can be a disk, and when pushed into the expansion pin 2, the back side of the flange 9 can abut against the inner front surface or front side 15 of the expansion pin 2, thereby affecting the maximum opening displacement of the ball 4.

[0037] Furthermore, the piston 1 is characterized by a ball-adjacent portion 7, the diameter of which is slightly greater than the diameter of the middle section 8 of the piston 1 guided by the expansion pin 2. Although the diameter difference between the middle section 8 and the flange 9 of the piston 1 is clearly visible in the figure, the thickness difference between the middle section 8 and the ball-adjacent portion 7 is smaller. Figure 1 and Figure 2 This diameter difference forces the piston 1 to move within the permitted limits and prevents it from disengaging from the quick coupling element 100 during standard operation due to the forces acting on the pin 1. In fact, the rear section 7 of the piston 1 with the contact surface is designed with a finely adjusted diameter that prevents the piston 1 from passing through the central hole 17 of the expansion pin 2. In the opening phase, when the ball 4 is pushed backwards by the actuating flange 9, the reference numeral 29 indicates the section following the coaxial duct 12 for the flow of the liquid, which opens as a thin spherical section 18 between the ball 4 and the base 3 in the closed state of the quick coupling element 100 corresponding to the position of the sealing point provided by the tight contact. In the opening phase, the compression of the loading spring 6 is guided by the housing element 5, the geometry of which has a side duct 11 for the passage of the fluid.

[0038] The passage of fluid through the expansion pin 2 is achieved through a series of circular holes 14 that connect the front side 15 of the quick coupling 100 to the rear side of the expansion pin 2. Figure 4 In the fully open configuration shown, the flow duct is provided by the opening sections 15, 14, 13, 12, 29 and 11. The same open duct is also present on the opposite quick coupling element, but is mirrored with respect to the contact plane 35 between the male and female connectors. A cavity 13 allowing flow is provided on the rear side of the expansion pin 2, which cavity can be a circumferential cavity around the pin 1, the diameter of which allows the fluid to flow out of the circular hole 14 into the cavity 13.

[0039] Then, these pipes further pass through the mounting holes 30, 30' into the hoses 25, 25 respectively, and pass from the quick connector 100 to the adjacent quick connector 100, and when the outer surface 34 of the male hydraulic connector 23 is inserted into the corresponding cavity 28 of the female hydraulic connector 22 until the hydraulic connector 200 is coupled (this can be done by bayonet, cam follower, complementary thread, etc.), these quick connectors 100 together form a two-way check valve 200. It can also include an O-ring positioned in the recess 24 of the outer surface 34 of the male hydraulic connector and a screw or bolt connector in the corresponding opening.

[0040] Finally, when disconnected (such as from Figure 4 to Figure 3 When the two front surfaces 21 of the piston 1 of the fluid coupling element 100 separate, the quick coupling device 100 gradually closes on both sides, thereby providing a liquid seal in the transition phase of the circuits 25 and 25', respectively, and the liquid loss is negligible because the thin spherical section 18 with a curvature radius matching that of the sphere 4 blocks the connection at the central pipe 29.

[0041] Figure 5 A view of the front surface of the fluid control element 100 is shown. The opening piston 1 is positioned on the central longitudinal axis 10, with its outermost front surface 21 extending beyond the base body 3 (extending out of the drawing plane). When the base body 3 is fully inserted, the front surface 27 of the base body 3 is also flush with the front surface of the expansion pin 2. Six circular holes are provided in the expansion pin. Of course, there may be only one or two circular holes, and the flow distribution is less disturbed when the ball 4 moves backwards from the thin ball section 18.

[0042] Figure 6 Shows Figure 1 1. A perspective view of a fluid control element 100. The housing 5 has an open side duct 11. The flange 9 is larger than the middle section 8 of the piston 1. The middle section 8 has a diameter slightly larger than the adjacent part 7 of the ball to allow the piston 1 to be introduced under pressure while ensuring that the piston 1 does not slip out of the fluid control element 100 when the fluid control element 100 is oriented with its flange 9 facing downwards.

[0043] Figure 7 Two pairs of male hydraulic connectors 123 and female hydraulic connectors 122 facing each other with two-way check valves are shown. Figure 1 A schematic cross-sectional view of a fluid control element; Figure 8 Shown when the other two-way check valve is closed Figure 7 Schematic cross-sectional view of. Figure 3 and Figure 4 The features of the embodiments are the same Figure 7 and Figure 8 The same reference numerals are used for features of the embodiments shown in FIG.

[0044] Two identical quick coupling elements 100 can be inserted into the interior of the mounting holes 30, 30' of two other hydraulic connectors 123, 122 of a hydraulic connector 210, which has a shoulder section or stepped section 26, 26' (e.g. Figure 3 ), allowing installation from one side of the outer surface 27, 27' of the hydraulic connector 123, 122. During installation, when the stepped feature or shoulder 31 of the base 3 contacts the opposite stepped feature or shoulder 26, 26' of the mounting hole 30, 30', the thrust applied to the expansion pin 2 allows the element to be inserted into the interior of the base 3, thereby generating an outward radial force, resulting in plastic expansion of the inner wall 20 of the hollow portion of the base 3. This plastic deformation is transmitted to the outer surface 19 of the base 3, which is tightly pressed against the hole surfaces 32, 32' of the corresponding male hydraulic connector 122 and female hydraulic connector 123, thereby Figure 7 and Figure 8 In the fully mounted state shown, an anchoring and sealing function is provided between the outer surface 19 of the base body 3 and the bore walls 32 , 32 ′ of the respective male and female hydraulic connectors 122 , 123 .

[0045] The cylindrically shaped male and female connectors 123, 122 are secured together by threaded nuts 130. The cylindrical nature of the male and female couplers 123, 122 ensures greater control over tighter tolerances than conical couplers. This allows for symmetrical and reproducible opening of the quick coupling system 210 when the rear and front surfaces 127', 127 of the male and female connectors engage.

[0046] The nut 130 having a threaded inner surface 131 engages with the threaded outer surface 135 of the female connector 122. This engagement mechanism ensures a gradual and smooth opening of the two check valves, which together form the quick coupling system 210.

[0047] The O-ring 150 is arranged in a circular groove on the outer surface of the male connector 123, preferably in the front half of this surface. The O-ring is used for pre-sealing before the coupling system 210 is opened. In fact, before the quick coupling system 210 is opened, the O-ring 150 is engaged with the inner surface 133 of the female connector 122. The further engagement of the nut thread 132 with the thread 135 on the female connector 122 opens the quick coupling system 210; when the outermost front surfaces 21 of the two pistons 1, preferably the outermost front surfaces of the corresponding flanges 9 of the pistons 1 of the male hydraulic connector 123 and the female hydraulic connector 122, are in contact with each other and pushed back into the fluid coupling element 100. Thanks to the seal provided by the O-ring 150, it is ensured that the fluid does not leak to the outside at any time during this opening phase.

[0048] The presence of the step-like feature 140 on the male connector 123 ensures controlled and optimal opening of the quick coupling system 210 when fully closed, as the front surface 127 of the female connector 122 is blocked by the front surface 127 ′ of the step 140 .

[0049] The closed position of the quick coupling element is Figure 1 and Figure 7 In this closed state, the spring 6 pushes the ball 4 toward the base 3, and the thin spherical segment of the ball 4 contacts the corresponding thin spherical segment 18 on the base 3 with a matching radius of curvature. Figure 7 In the configuration shown, a fluid, in particular a liquid, is present at a defined pressure on the axis of symmetry 10 in mounting holes 30, 30', which can be connected to circuits 25, 25' (eg Figure 3 As shown, in Figure 7 The back pressure of the quick coupling element 100 is described by holes 30 and 30', and applies pressure to the back side of the quick coupling element 100, which is called reverse pressure. This reverse pressure presses the ball 4 tightly against the base 3 and the thin ball segment 18, thereby providing a sealing function and zero leakage of liquid. In this configuration, the opening piston 1 does not produce any resistance to the movement of the ball 4 and is located Figure 1 The resting position is shown.

[0050] It should be noted that the front surface of the nut 130 extends further along the axis 10 than the front surface 21 of the flange 9 of the piston 1 , thereby protecting the piston 1 .

[0051] The quick-coupler is in the open position. Figure 2 and Figure 8 This occurs when a male hydraulic connector 123 with an inserted and expanded quick coupling element 100 is mated with a female hydraulic connector 122 with another oppositely facing quick coupling element 100 inserted and expanded. In this configuration, the outer surface 132 of the male connector 123 and the inner surface 133 of the female connector 122 together form a guide system that forces the two oppositely facing quick coupling elements 100 to align along their common main longitudinal symmetry axis 10, which in turn is also aligned with the longitudinal axis 10. Figure 8 The main longitudinal symmetry axes 10 of the male connector system 123 and the female connector system 122 in the plugged state are consistent.

[0052] The groove in the outer surface 132 of the male connector 123 includes an O-ring 150, which is engaged by the inner surface 133 of the female connector 122, thereby avoiding Figure 8The nut 130 is rotated about its axis of symmetry 10 and moves the male connector 123 and the female connector 122 together until the front surface 127 of the female connector 122 contacts the front shoulder of the step 140 .

[0053] During the transition from closed to open, when the male connector 123 and the female connector 222 are plugged together, as shown in FIG. Figure 7 and Figure 8 As shown in the transition between the two, the hollow sleeve of the quick coupling device 100 is the first element in the quick coupling device 100 to contact each other, and the female connector 122 engages the O-ring 150 of the male connector 123 before the outermost front surface 21 of the piston 1 contacts each other. Further connecting the two plugs 123 and 122 to the final position causes the ball 4 to be pushed back through the contact surface 16 between the ball 4 and the piston 1, thereby causing the spring 6 in the housing 5 to compress and put the two opposing quick coupling elements 123 and 122 in a fully open state, as shown in FIG. Figure 8 The expansion pin 2 has a central hole 17 which guides the piston 1 during its forward and backward movement so that the piston 1 is always centered on the main longitudinal symmetry axis 10 of the quick coupling element 100. This is achieved due to the tolerance between the diameter of the middle section 8 of the piston 1 and the diameter of the central hole 17 of the expansion pin 2.

[0054] Thanks to the large diameter of the front part of the piston 1 and the flange 9, the contact surface 21 of the part of the piston 1 responsible for opening the quick coupling element is increased, thereby also enhancing the reliability of the quick coupling opening and closing mechanism. The flange 9 can be a disk. When pushed into the expansion pin 2, the back side of the flange 9 can abut against the inner front surface or front side 15 of the expansion pin 2, thereby affecting the maximum opening displacement of the ball 4.

[0055] The passage of fluid through the expansion pin 2 is achieved through a series of circular holes 14 that connect the front side 15 of the quick coupling 100 to the rear side of the expansion pin 2. Figure 8 In the fully open configuration shown, flow conduits are provided by opening sections 15, 14, 13, 12, 29 and 11, with reference to Figure 1 and Figure 2 The same open duct is also present on the opposite quick coupling element, only mirrored with respect to the contact plane between the male connector 123 and the female connector 122. A cavity 13 allowing flow is provided on the rear side of the expansion pin 2, which cavity may be a circumferential cavity around the pin 1, the diameter of which allows the fluid to flow out of the circular hole 14 into the cavity 13.

[0056] Reference numerals list

[0057] 1 Open the piston

[0058] 2 expansion pin

[0059] 3 Sleeve-shaped base

[0060] 4 spheres

[0061] 5 Housing

[0062] 6 Loading spring

[0063] 7 Adjacent parts of the sphere

[0064] 8 Middle section

[0065] 9 Piston flange

[0066] 10 Axis of symmetry

[0067] 11 Side pipe

[0068] 12 Coaxial cavity

[0069] 13 Dorsal

[0070] 14 Round hole

[0071] 15 Front

[0072] 16 Contact surface

[0073] 17 Center hole

[0074] 18 Thin sphere segments with matching radii of curvature

[0075] 19 Outer surface

[0076] 20 Inner wall

[0077] 21 Outermost front surface

[0078] 22 Female hydraulic connector

[0079] 23 Male Hydraulic Connector

[0080] 24 Recess for O-ring

[0081] 25, 25' loop / hose

[0082] 26, 26' shoulder section

[0083] 27 front

[0084] 27' behind

[0085] 28 chambers

[0086] 29 Center Pipe

[0087] 30, 30' mounting hole

[0088] 31 Shoulders

[0089] 32, 32' hole surface

[0090] 33 Inner surface

[0091] 34 External surface

[0092] 35 Contact plane

[0093] 36 Locking opening

[0094] 37 Extension

[0095] 38 front surface

[0096] 100 Fluid coupling components

[0097] 122 Female hydraulic connector

[0098] 123 Male Hydraulic Connector

[0099] 127 Front surface of female connector

[0100] 127' Front surface of male connector

[0101] 130 threaded nut

[0102] 131 Internal thread surface

[0103] 132 Nut thread

[0104] 133 Inner surface

[0105] 134 External surface

[0106] 135 External thread surface

[0107] 140 Step with front shoulder

[0108] 150 O-ring

[0109] 200 Hydraulic connector

[0110] 210 Hydraulic connector

Claims

1. A quick coupler for a fluid guiding line, the quick coupler comprising: a tubular body (3) having an outer sleeve surface (19), an inner receiving cavity, an axial fluid flow passage (12) therethrough, and a valve seat (18), An expansion body (2) having an axial fluid flow passage (14) passing through the expansion body and an outer sleeve surface (20), and A valve comprising a valve ball (4), a valve stem (1) and a compression spring (6), The outer sleeve surface (20) of the expansion body (2) is oversized relative to the inner receiving cavity of the tubular body (3) so as to generate an outward force on the outer sleeve surface (19) of the tubular body (3) when the tubular body (3) is introduced. wherein the valve ball (4) is positioned between the spring (6) and the valve stem (1), wherein the spring (6) is positioned to preload the valve ball (4) relative to the valve seat (18) and to close the axial fluid flow passage (12, 14) through the quick coupler in the event of any pressure on the valve ball (4) from the direction of the valve stem (1) below a predetermined threshold, wherein when the valve ball (4) is in contact with the valve seat (18), the valve stem (1) extends beyond the front surface (38) of the tubular body (3), and wherein when the valve stem (1) is pushed toward the valve ball (4) so ​​that the front surface (21) of the valve stem (1) is flush with the front surface (38) of the tubular body (3), the axial fluid flow passage (12, 14) through the quick coupler is opened, Therein, the spring (6) and the valve ball (4) are at least partially positioned in a cylindrical housing (5) attached to the tubular body (3).

2. The quick coupler according to claim 1, wherein: The valve stem (1) has a flange (9) having a diameter greater than that of the guide hole of the expansion body (2).

3. The quick coupler according to claim 1 or 2, wherein: The housing (5) has a side opening (11) near its attachment portion to the tubular body (11).

4. The quick coupler according to any one of claims 1 to 3, wherein: The housing (5) has a first inner diameter near the attachment portion to the tubular body (11), and has a second inner diameter on the side opposite to the attachment portion to the tubular body (11), the first inner diameter being suitable for accommodating and guiding the valve ball (4), and the second inner diameter being suitable for accommodating and guiding the spring (6).

5. The quick coupler according to claim 4, wherein: The housing (5) has an open bottom surface and / or side openings along a portion thereof having the second diameter.

6. The quick coupler according to claim 4 or 5, wherein: The first diameter is greater than the second diameter, and a tapered section is provided between the two portions of different diameters.

7. The quick coupler according to any one of claims 1 to 6, wherein: The axial fluid flow channel (14) inside the expansion body (2) comprises at least one, preferably a plurality of axial through holes in the expansion body (2) at a radial distance from the longitudinal axis (10) of the expansion body (2).

8. A fluid coupling device (200, 210) for a fluid guiding line, the fluid coupling device comprising: A first quick coupler (100) and a second quick coupler (100), wherein the first quick coupler and the second quick coupler are both according to any one of claims 1 to 7, A male hydraulic connector (23, 123) having an axial fluid flow passage (14) passing through the male hydraulic connector, a receiving cavity having a diameter of the tubular body (3) of the second quick coupler (100), and having a rear end for connection with a second fluid guide line (25) and an opposite front end (27), and including a coupling end (34, 134), a female hydraulic connector (22, 122) having an axial fluid flow passage (14) passing through the female hydraulic connector, including a receiving cavity having the diameter of the tubular body (3) of the first quick coupler (100), and having a rear end for connection with a first fluid guide line (25') and an opposite front end and a receiving cavity (28) for a coupling end (34, 134) of the male hydraulic connector (23, 123); wherein the first quick coupler (100) and the second quick coupler (100) are positioned in the male hydraulic connector (23, 123) and the female hydraulic connector (22, 122), respectively, and when the expansion body (2) of the quick coupler (100) is completely positioned in the corresponding quick coupler (100), the front surface does not extend beyond the front surface (27) of the male hydraulic connector (23, 123) or the inner wall surface (27') of the receiving cavity (28) of the female hydraulic connector (22, 122); The female hydraulic connector (22, 122) and the male hydraulic connector (23, 123) are configured so that the front end of the male hydraulic connector can be axially inserted into the front end of the female hydraulic connector to establish a continuous fluid flow path between the hydraulic connectors (22, 23; 122, 123).

9. The fluid coupling device (200, 210) according to claim 8, wherein: The male hydraulic connector (23) and the female hydraulic connector (22) have connection devices (36, 130).

10. The fluid coupling device (200) according to claim 9, wherein: The connection device comprises a screw connecting the male connector (22) and the female connector (23) at a radial distance from the axis (10) of the male connector (22) and the female connector (23), wherein the screw is oriented parallel to the axis (10).

11. The fluid coupling device according to claim 9, wherein: The male connector and the female connector are connected using a connection device including a bayonet fastener, a tension lock or a swing stop.

12. The fluid coupling device (210) according to claim 9, wherein: The connection device comprises a nut (130) having an internal thread (132) surrounding the sleeve of the male connector (123) and an external threaded surface (135) disposed on the sleeve of the female connector (122).

13. The fluid coupling device (210) according to claim 12, wherein: A circumferential groove is provided on the sleeve of the male connector (123), and wherein an O-ring (150) is provided in the groove so as to engage the inner surface (133) of the female connector (122), and the nut (130) moves the female connector (122) toward the male connector (123) when rotated until the front surface of the female connector (122) contacts the step (140) of the front shoulder, thereby realizing an open fluid coupling device (210).

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