CN1018291B - Coupling, in particular quick-acting coupling for fluid conduits - Google Patents

Abstract

A coupling, preferably designed as a quick-acting coupling, comprises two coupling halves (2, 3) whose sealing surfaces are made of materials having identical coefficients of thermal expansion, in particular a hard metal, and designed to connect by precise clearance fit without conicity or pressing. This dispenses without the need for sealing rings. The coupling gives maintenance-free, trouble-free service with aggressive fluids over a wide range of temperatures.

Description

Coupling, in particular quick-acting coupling for fluid conduits

The present invention is about a kind of joiner, especially a kind of joiner of fluid line of snap action.

Such joiner is particularly useful for connecting closely fast of flexible pipe or other flexible liquid pipeline.

Such joiner has been described in Swiss Patent NO.CH-A-626696, it has two sealing components, one of them is designed to the plug valve, another is designed to the socket valve, each all has a coupling part, it can be driven by a spring component and enter closed state, and the seal ring by sealing state in each cavity is pressed on the interior tapered surface of sealing component.The sealing of two sealing components is by sealing component the seal ring of elastic material to be forced together to obtain.In coupled situation, coupling part can be locked in the release position by a pinning device, like this, when pressure surge, does not just have moving axially of the release position that exceeds it.This means and in most of ill environment, close, therefore pin whole system fully in order to prevent valve.Two sealing components are pinned by lock ball, and in coupled situation, these lock balls are positioned at the groove of socket valve and sleeve.The additional groove that can slip in the sleeve of plug and socket valve can make ball enter non-lock bolt position; When connecting and taking apart, must replace these lock balls, may bring some in this process as problem such as polluting or block.

Seal wears is rapid, can only just can avoid sewing the damage that causes by frequent periodic maintenance (displacement seal ring).In order to change seal ring, whole joiner must be taken apart, has so not only required great effort but also time-consuming, also must close the plant.Elastic sealing ring can not be used for corrosive fluid or gas, the occasion that high and low or bigger temperature fluctuation and radioactivity exist.Up to now, can't use the joiner of any this character in this state.Another shortcoming of the joiner that this class is general is to have a large amount of parts, and this just makes it not only unreliable but also expensive.

Described another kind of this class joiner in F.P. No.FR-A-1288938 and Swiss Patent No.CH-A-474010, it has the sealing conical surface, and an elastic packing flange is pressed on the conical surface.Often open and close the wearing and tearing that sealing component can cause sealing flange and conical surface, damage the tightness of whole joiner.If seldom open this joiner, the sealing bead that compresses may be attached on the opposite face, just can not discharge joiner thereby do not damage it.In addition, when two sealing components force together, may pollute between conical surface, it is impossible that the suitable tightness of generation is become.

The joiner that the object of the present invention is to provide simplicity of design to safeguard, it can be used for the occasion of corrosive fluid and large-temperature range.This joiner especially can be used for high temperature, low temperature and temperature fluctuation occasion big, that have radioactivity, harsh environmental conditions and reach under water.

According to the present invention, this purpose can be reached by the method that is arranged at claim 1 characteristic: promptly a kind of joiner, especially have two and can connect sealing component in order to connect the joiner of fluid line, it is characterized in that: the sealing surfaces of two sealing components is periphery and/or prismatic surface, these surfaces are by being separated from each other movingly, periphery or the surface line that prismatic surface produced are parallel to the axle of joiner, and therefore in coupled condition, they do not force together mutually; Do to such an extent that the very for a short time fluid that makes can not spill between the sealing surface movingly.

Advantage of the present invention is substantially based on such fact: opposite with popular actual practice, it is without elastic sealing ring, cone seal surface or elastic flange; Cancellation maintenance requirement, permission are adopted than the simple structure of popular joiner, only reach the tightness of sealing component with element seldom, therefore when assembling and manufacturing, only require seldom processing and process step.

The preferred embodiment of joiner of the present invention is listed among the claim 2-15

Referring now to accompanying drawing the embodiment of joiner of the present invention is described in more detail, wherein:

Fig. 1 is the longitudinal sectional view of the snap action joiner of not coupled situation,

Fig. 2 is the longitudinal sectional view of this joiner of coupled situation,

Fig. 3 is the side view of this joiner coupling part,

Fig. 4 be Fig. 3 IV to the coupling part view,

Fig. 5 is the longitudinal sectional view of coupled situation joiner remodeling not

The joiner of the snap action that Fig. 1-4 is represented is used to connect the flexible pipe that water or the such flow of liquid of oil are crossed.It is made up of two sealing components 2 and 3, and coupling member 2 is made imaging plug valve, and member 3 is made imaging socket valve.In two sealing components 2 and 3, all elements, the spring 6,19 that will describe after comprising and spring clip 14 and lock ring 13 all use same material to make, and the most handy steel is especially made with the erosion-resisting steel of high hardness; Therefore, their thermal expansion coefficient is identical.The material that use has same thermal expansion coefficient is necessary, under the situation of temperature generation fluctuation of environment or fluid sealing surfaces is kept movingly with this, makes their gap width not develop into inseparable drive fit or sew cooperation.The spiral spring 6 that each sealing component 2 or 3 all has coupling part 5 and uses as Packing spring.The external diameter of helical spring 6 is hanked and is made it diameter close fit with the following hole that will describe 35 or 36.

Plug valve 2 has plug portion 10, and its coaxial convex portion 12 nestles up its fore-end 16, and when anterior 16 connect, 16 parts are towards socket valve 3, and subsequent is a groove 15.Six elastic tongue pieces (14) that socket valve 3 has jack part 11 and has hook recess at its free end, they are welded on the slit lock ring 13, above-mentioned notch part surpasses the previous section 18 of jack part 11, and spiral spring member 19 is slided on it.A capping 7 securely all is being spirally connected on each plug portion 10 and jack part 11.

Slit lock ring 13 is clamped in the coaxial groove 20 of jack part 11 securely, and helical spring 19 is slidingly fitted on the partial-length of lock ring 13 and tongue piece 14.One end of helical spring 19 nestles up on the projection 24 of jack part 11, and this convex portion 24 is edges that radially extend that groove 20 leaves front end 18, and the interior teat that the other end is supported on groove 17 almost coaxials divides on 29, approximately is positioned at its centre.

In order to carry out connection, the power that overcomes spring 19 by hand makes sleeve 17 retractions, and tongue piece 14 has elasticity, and it can be pulled on the convex portion 12, up to seat in groove 15.The elastic force of spring 19 back into sleeve 17 on the tongue piece 14 again, makes the tongue piece 14 can not the radially outward bending, and like this, two sealing components 2 and 3 just are fixed together in the mode that can't slip off.Under the state that connects and do not connect, convex portion 29 is located on first bending point that leaves tongue piece 14 joining shaft, that stretch out from lock ring 13, therefore can prevent sleeve 17 to lower slider, can also when assembly and disassembly, sleeve 17 be shifted onto on the elastic tongue piece 14 by the increased pressure gradually that adds.

Front end 16 at plug portion 10 has a coaxial annular protruding portion 21, and the front end 18 of jack part 11 also has the inner coaxial annular projection 22 and the circular protrusion part 23 of outer, coaxial, forms a circular groove between them.Projection 21 has two barrel surfaces 25 and 26, and interior projection 22 has a barrel surface 27.Outer outstanding part 23 has a barrel surface 28 when sealing component 2 and 3 links together, and surface 25 and 27 and 26 and 28 is slidingly matched in couples and is in the same place.Between surface 25 and 27, the maximal clearance is 5um, and this only is the situation (if be used for the property condition of water, the stringency of maximal clearance width requirement is smaller) of helium sealing.Therefore parallel grafting valve 2 with 28 pipeline in cylindrical tube surface 25,26,27 or 3 axle also are parallel to joining shaft, thereby should reduce tapering as far as possible, tapering at most only can be somewhat, can not surpass, otherwise as quick connector the time, the plug valve may be stuck in the socket valve.

Each all has a coaxial hole 31 and 32 plug portion 10 and jack part 11, and their diameter is identical, when being linked together, flushing mutually and aims at mutually. Hole 31 and 32 edge are the wedge angle that does not have burr.Hole 31 and 32 length are equivalent to the half as much again of its diameter respectively basically, slightly are longer than the bobbin length on surface 25 or 27.As following described, the tube length on hole of representing among Fig. 1 31 and 32 length and surface 25 or 27 depends on machining accuracy and desired sealing effect.Hole 31 feeds the hole with coaxial internal surface 25 at the end towards front end 16, the internal diameter in this hole divides 22 external diameter identical with cyclic lug under the situation of not considering to be slidingly matched, hole 32 is divided in 22 at cyclic lug and is extended, and approximately to add the tube length sum of upper surface 25 identical with the length in hole 31 for its total length.

The radially ledge surface 42 perpendicular to the hole axle is stretched out in hole 31 and 32 respectively, enters hole 35 and 36; Hole 35 and 36 diameter are basic identical, the axle in these holes and sealing component spool also be identical.Hole 35 and 36 diameter are structurally determined by the diameter of the diameter of the top cap that is mounted in it coupling part 5 (describing later on) and spiral spring.The length in hole 35 is derived by following length: the length of the spiral spring 6 that compresses fully, add the thickness of top cap 39, and add the length (below will describe) of the joint 40 of coupling part 5, add several millimeters b.After making fluid flow through the opening of coupling part 5 and guide member 41(, will describe) to add several millimeters b again be necessary, this point is later will be described.

Be in the annular protruding portion 21 of mutual sealing state, 22,23, the axial length of surface of contact stretch out connecting hole 31 when the coupled situation greater than opening and guide member, the twice of 32 outer length b is being drawn back when being connected sealing component 2,3 like this, fluid can not run out of from pipeline and/or sealing component 2,3.

Just as illustrated in fig. 1 and 2, capping 7 is that coaxial threaded joint 43 is linked on the coaxial hexagon nut and made, and a hole 47 is arranged at the middle part of inipple 43, and it stretches into the axial interior threaded hole 50 in the hexagon nut on the radial wall 49 perpendicular to the hole axle.As mentioned above, top cover 7 is screwed on plug portion 10 and the jack part 11 at the other end of lid end 16 or 18 by internal thread 50 and outside thread 52 respectively.At assembling condition, capping 7 is placed on plug portion 10 and the jack part 11 securely.Push down plug portion and jack part by wall 49 and obtain sealing away from another front ends of front end 16 or 18.For being screwed to capping 7 on plug portion 10 and the jack part 11 securely and backing out later on, they adopt and the circular surface 54 or 55 same procedure of interface 10 and 11 shape, i.e. the shape of top said hexagon nut 44.

Flexible pipe or flexible pipe (not shown) are fixed on sealing component 2 or 3, under situation as illustrated in fig. 1 and 2, are fixed to an end of the inipple of capping 7, can certainly clamp hose coupling securely with hose clip and replace inipple.

Disc top cap 39 is made mushroom-like coupling part 5 with the cylindrical bolt as push rod.The upper surface 60 of top cap and lower surface 59 are parallel to each other and basically perpendicular to the bar axle.Disc top cap 39 to cut away part be the part 57 of two relative circles, the space that they flow through as fluid.In coupled situation not, the lower surface 59 of top cap 39 is overlayed on stop surface 42 by spiral spring 6.The upside 60 of top cap 39 supports an end of spiral spring 6.Push rod has three semi-circular indentation 56 at its end that leaves the top cap, and the circle distribution of recess distaff, length are 2/3rds of total length.The cross-section area of two part circles 57 is substantially equal to the area of three recesses 56, and in coupled situation, fluid flows through them.Joint 40 is designed to cylindrical, it only account for opening and guide member 41 length 1/3rd.These length ratios are hanked like this: fluid is flow on the segment distance b between the end of joint 40 and the surface 42 and flow out three recesses 56, this point can be as seen from Figure 2.

In Fig. 1 and Fig. 2, for clearly illustrate that fluid when connecting freedom and stop up path, the bar axle around them has rotated 90 degree to coupling part 5 from the represented position of Fig. 3.

In coupled situation, the opening of coupling part 5 and guide member 41 are aimed at mutually, and when assembling, coupling part 5 freely rotates in hole 31 or 32, sealing component 2 and 3 also freely rotates, and how the cross section the when result just can not estimate coupled situation between the recess 56 cooperates.Front end at opening and guide member 41 has the oblique angle, fluctuating in fluid when this can prevent that recess from rotating mutually.

In coupled situation not, as shown in Figure 1, the joint 40 of coupling part 5 is inserted in respectively in hole 31 and 32, and when fluid is a water, sealing member material is a steel, and hole 31 and 32 pressure reduction are several ton hours, and their gap movingly is 5um to the maximum; The size in this gap is along with the pressure reduction of contained fluid, the available elastic force of the helical spring 6 of the length of the viscosity of fluid, joint 40 and changing.Under the situation of surperficial 25-28, the tapering of joint 40 and hole 31 and 32 can not surpass angle somewhat.

On the one hand, it is enough big that want in above-mentioned gap, thereby coupling part 5 is slided easily, on the other hand again should be enough little, and to guarantee suitable sealing to the fluid in the hole 36.When two sealing components 2 and 3 draw back and when not connecting, the member of Packing spring 6 must before push away coupling part 5 as early as possible.This is possessing whenever can accomplishing of enough big elastic force, releases normal several Newton force but only can arrive greatly with two hands under little hard situation, thereby two coupling parts are shifted onto together.

In above-mentioned example, in order to sealing be designed to be to the maximum 5um movingly, this a pair of sealing surface as attachment hole 31 or 32 and corresponding joint 40 between accomplish.Under the situation of sealing surface,, under 65/66 the situation, can rise to 1/10th millimeters movingly for example at paired face 61/62,25/27,63/64,26/28 with some complex array radially.

For any seal ring of tool not and do not have coarctate sealing surface and obtain so surprising connection sealing effect, perhaps can be explained as follows: have one deck fluid film in the annular space between hole 32 and joint 40, because its adhesion effect makes on its inwall and contiguous block 40 attached to hole 32.The frictional force of contiguous block 5 is similar to the frictional force of trunnion bearing in-lubricant in hole 32.It is directly proportional with the viscosity coefficient of slidingsurface, the movement velocity of coupling part 5 and the inverse of gap width, flow through the speed in gap and be directly proportional, and viscosity coefficient depends on the temperature and the pressure thereof of fluid with pressure gradient, the clearance cross section of inner and outer surface gap width and viscosity coefficient inverse long-pending, 1/4th.In a word, can suppose that so surprising sealing effect is based on that the adhesion of nonperfect fluid physically and characteristic (viscosity coefficient or the like) thereof obtain.

When coupling part 5 seesaws, block in order to prevent them, must correct guidance to guarantee that its highi degree of accuracy, correct guidance are to adopt the method for the accurate fitting surface of Crossware between the recess 56 to draw.

Seal by the fluid between two sealing components on surface 25 and 27,26 and 28, and as what mention in the past, their tolerance is on micron dimension.These surperficial precision can be smaller, and this is because the sealing here is to be obtained by following sealing under radially complicated mode; These gaps are two gaps between the surface 25/27 and 26/28, modification space between two radial surfaces 61 and 62 of hole 32 to surface 27 and hole 31 to surface 25, from table 27 to the gap two radial surfaces 63 and 64 of 28 and from 25 to 26, and with contiguous radial surfaces 65 in surface 26 or the radial surfaces 66 contiguous with surface 28.The sealing effect on these paired surfaces 25/27,26/28,61/62,62/63 and 65/66 is owing to adding that suction effect is further improved on the fluid of the liquid that flows through in the gap.

Taking apart when connecting, with hand sleeve 17 is pushed back, be added in card on the convex portion 12 and play power and draw back sealing component 2 and 3 by overcoming tongue piece 14.Helical spring 16 extrudes sealing component 2 and 3 with coupling part 5 substantially reposefully.Two openings and guide member 41 contact with each other in their front portion, and corresponding joint 40 slips in respective connecting 31 or 32, therefore seal the liquid in the pipe-line system behind the sealing component.Sealing component only move to make paired surperficial 25/27,26/28,63/64,65/66,61/62 no longer include sealing effect, approximately joint 40 total lengths 2/3rds place in hole 31 or 32 till.When taking apart, owing to before separating fully mutually, obtained sealing at the sealing surfaces that connects, so can not spray liquid.Coupling part 5 further slips into attachment hole 31 and 32 then, below top cap 39 59 push up the surface 42 on till.

When making the element of two Sealings 2 and 3, must be noted that and guarantee that surface 26 and 28, especially 25 and 27 is coaxial mutually and do not have tapering as far as possible.This tapering can not surpass somewhat, because higher value will be damaged the operability that connects, can cause blocking case when drawing back sealing component under the bigger situation of pressure.An advantage of these coaxial surface is to work as to shift sealing component 2 and 3 onto a time-out, and the dirt that adheres on the surface 25/27 and 26/28 is pulled on one side.

Experiment finds, when sealing component is moved the only about half of bobbin length on surface 25 or 27 to, still can keep sealing.Therefore the design with above-mentioned two surfaces 25 and 27 can obtain sealing.

For the sealing of coupling part 5, situation is similarly, must avoid the tapering of surface and axial attachment hole 31 or 32 of joint 40 equally.

Top cap 39 is except making above-mentioned shape, and it can also have some holes, and the hole substantially parallel axes can also be split into the hole of little cross sample in the bar axle.Its function is to withstand an end of helical spring 6 and withstand surface 42 when taking connection apart, and spring 6 can not released corresponding sealing components 2 or 3 with coupling part 5 like this.Otherwise, top cap 39 will have to make make liquid can flow through it or from its next door flow through.

Three recesses 56 also can be made some recesses and be different from the recess of shape shown, only need guarantee steering capability and suitable flow here.Yet the form shown in the diagram is verified to be best.

Also available three of six elastic tongue pieces 14, four, five or more than six tongue pieces.Yet six tongue pieces can be guaranteed good guide effect when pushing away together.

If do not have very high seal request when connecting, in simplified structure, also can save sealing surfaces 26 and 28.

Elastic tongue piece 14 is used for preventing that with spring-loaded sleeve 17 two sealing components together separately, thing as an alternative, as shown in Figure 5, can be on sealing component 70 machining screw 71, have interface nut 74 on another sealing component 73, interface nut 74 has coaxial step 75, has radially step 76 on the sealing component 73, its diameter is greater than the internal diameter of step 75 radially, installing before the flexible pipe, and interface nut 74 is enclosed within on the corresponding sealing component 73.

The layout of annular protruding portion 21,22,23, sleeve 17 and tongue piece 14 all may be selected the asymmetrical shape as avette.Asymmetrical shape has been stipulated sealing component 2 and 3 mutual relevant positions, and in addition, if the radial position of 5 pairs of corresponding sealing components 2 of coupling part or 3 becomes to make the recess 56 of two openings and guide member 41 to aim at mutually surely, peak rate of flow always appears at coupled situation.As an example, coupling part 5 can be fixed in the following manner, and promptly top cap 39 has groove or thrust (not shown) near its edge, their outstanding hole 35 or 36 interior (not shown) of being absorbed in.

If annular protruding portion 21,22,23, sleeve 17 and tongue piece 14 are made difformity, as be different from columniform avette, triangle or polygonal; This just may make a kind of not joiner of interchangeable sealing component that has.This just makes the whole joiner of installation consist of possibility, and this joiner group has been got rid of the danger of disturbing independent sealing component and exchange liquid stream.If sealing surfaces 25/27 and 26/28 is not to be made of periphery but to be added flat right angle part surface or only be made of prismatic surfaces by cylinder, the tube line parallel of annular portion surface or its part surface or prismatic surfaces is in the axle of socket or plug valve 2 or 3 so.Take different shapes Shi Yike and adopt different diameters.In addition, this joiner can also be encoded by the hole and the pin of surface 62,64,65 couplings of the surface 61,63,66 of one or more sockets 3 and one or more plug portion 2.Can also only provide screw hole at surperficial 61-66, for producing the coding that requires, the user is screwed to suitable Kong Zhongyu flush with pin and thread screw.

If the joiner of this snap action does not use coupling part 5 and helical spring 6, this joiner also can be used as the simple joiner of connecting tube.

Flow velocity can be regulated by the size of recess 56 cross-sectional area, and in other words, flow velocity can be assigned to set by the joint part that insertion has a cross section of corresponding recess 56.

Hole 35 and 36 be can also design and attachment hole 31 and 32 replaced as attachment hole.The top cap 39 of coupling part 5 is designed to joint 40, opening and guide member 41 similar coaxially.Hole 31 also can be by they being undertaken be connected and guide function designs with 32 or 35 and 36.This moment, these holes had the axial groove (not shown) at the internal surface that leaves anterior 16 or 18 places, in order at coupled situation water conservancy diversion fluid.The remaining part in hole is designed to joint.If the top cap is designed to a joint, opening and guide member, that unsealing spring 6 must be designed to no longer be adjacent to the central spring of top cap flange.This technological scheme comprises comparatively complicated structure, concerning macropore 35 and 36, compares with hole 31 or 32, and accurately cooperating is difficulty and hard.

Because coupling part 5 adopts the mushroom hair style design of step, so it plays variable step down transformer effect.When not connecting, can produce continuous pressure drop, the undue fluctuation in this pipe-line system that can prevent to take apart.

Because the particular design of this joiner also can avoid hindering mobile internal thread, for providing smooth inwall to give special attention for hole 35 or 36.

As noted earlier, the great advantage of the joiner of joiner of the present invention or snap action is the elastic sealing elements that disappeared, and these elements must exchange specially, and are easy to wearing and tearing, and this depends on fluid, room temperature and other condition that flows through certainly.

Sealing surfaces 25/27,26/28,31/40,32/40, coupling part 5, plug and jack part 10 and 11 except making with steel of the same race, brass or the aluminium manufacturing that can also handle with same processing method especially surface treatment method.Except adopting same hard metal, coupling part 5 and plug, jack part 10 and 11 can also be with duroplastss or are only made with being coated with moulding material.

During connecting, must be noted that to obtain stably flow and very close to each other and corner may deposit some material in these gaps and corner.For this reason, this joiner especially is suitable for food department.It also is used for chemical industry and laboratory.

By the anterior face 61-66 and the 25-28 of appropriate design plug and socket valve 2 and 3, this joiner also can be used for air communication and crosses its occasion.

The such light metal manufacturing of the also available aluminium of joiner of the snap action of describing in the claim 6 and 8.Also can open a groove that is used for inserting seal ring, preferably open on an angle on two surfaces 27 and 63 or 25 and 62.Coupling part 5 also can have the groove of a peace seal ring, preferably drive top cap 59 and joint 40 and below an angle on.

Claims (15)

1, a kind of fluid line coupling of snap action, have two attachable sealing components (2,3), it is characterized in that: two sealing components (2,3) sealing surface (25/27,26/28) is periphery and/or prismatic surface, these surfaces are by being separated from each other movingly, the surface line that periphery or prismatic surface produce is parallel to the axle of joiner, in coupled condition, they do not force together mutually like this, do very for a short time movingly, fluid can not be spilt between front cover (25/27,26/28).

2, according to the fluid line coupling of the snap action of claim 1, it is characterized in that sealing surface (25/27,26/28) is by having same thermal expansion coefficient, preferably making with same hard metallic material.

3, according to the fluid line coupling of the snap action of claim 1 or 2, it is characterized in that: each all has the cylindrical hole (31 of same diameter two sealing components (2,3), 32), and each all has a minimum annular protruding portion (21,22,23); In coupled situation, hole (31,32) flush mutually and are adjacent to, and aim at mutually; Be nested together with sealing means at coupled situation annular protruding portion (21,22,23).

4, fluid line coupling according to the snap action of claim 3, it is characterized in that: the internal diameter of the annular protruding portion (21) of a sealing component (2) is greater than the diameter of hole (31), between the internal surface (25) of projection (21) and hole (31), has a ring-shaped step (62) that is basically perpendicular to joint coupling shaft at least, its annular protruding portion (22) is passed in the hole (32) of another sealing component (3), in its outside (27) by a circular groove (27,63,28) surround, this circular groove should be admitted the projection (21) of a sealing component (2), sealing surfaces is by the internal surface (25) of the annular protruding portion (21) of a sealing component (2), outer surface (27) with the annular protruding portion (22) of another sealing component (3), and the circular groove (27 of the outer surface (26) of the projection (21) of a sealing component (2) and another sealing component (3), 63,28) respective surfaces (28) constitutes; Substantially the vertical annular bottom surface (63) of an anterior face (61) of step (62) and projection (22) and circular groove (27,63,28) and the annular front of projection (21) are as the stop surface of two sealing components (2,3).

5, according to the fluid line coupling of the snap action of claim 1, it is characterized in that: a sealing component has outside thread (71), and another sealing component has the correspondingly interface nut (74) of coupling, prevents that with this two sealing components from sliping off.

6, according to the fluid line coupling of the snap action of claim 1, it is characterized in that; One in two sealing components (2) has outer coaxial rings (12), and another member (3) has plurality of elastic tongue piece (14), and they are contained in the outside of this member, its free end curves form of hooks, in coupled situation, they reach on the outer shroud (12), slip off to prevent joiner.

7, according to the fluid line coupling of the snap action of claim 6, it is characterized in that: another sealing component (3) has a retractible maintenance sleeve (17), with spring (19) device it is slided on the tongue piece (14), when connecting forward; Overcome the elastic force of spring (19), the sleeve withdrawal discharges tongue piece (14), and then, sleeve is made by spring (19) device and is enclosed within forward on the tongue piece (14), and (12) engagement is depressed and encircled to their hook shaped ends like this.

8, according to the fluid line coupling of the snap action of claim 1, it is characterized in that: each sealing component (2,3) all has a coupling part (5) that loads with Packing spring (6), in coupled situation not, it blocks sealing component (2,3), unclamps them in coupled situation; Coupling part (5) has an opening, guide member (41) and joint (40), and they are at the attachment hole (31 of sealing component (2,3), 32) guiding in, in coupled situation, opening and guide member (41) are positioned in the attachment hole (31,32), and be designed so that fluid can flow through them, joint (40) is positioned at the outside of attachment hole (31,32) in coupled situation, in coupled situation not, be close in the attachment hole (31,32).

9, according to the fluid line coupling of the snap action of claim 8, it is characterized in that: two coupling parts (5) compress when connecting mutually, and overcome the power of Packing spring (6) and move, in coupled situation, each Packing spring (6) is almost compressed by coupling part (5) fully, in coupled situation, coupling part (5) firmly fixes together in case the pressure surge of fluid stopping body like this.

10, fluid line coupling according to the snap action of claim 8 or 9, it is characterized in that: coupling part (5) is a mushroom-like, in coupled situation not, the downside (59) of the top cap (39) of mushroom-like coupling part (5) is close to each sealing component (2,3) on the stopping part (42), the support that the upside (60) of top cap (39) is made Packing spring (6) one ends, bar (40,41) has a recess (56) that is used for by fluid on the part (41) at least, another part that the side that mushroom eats the top cap of shape coupling part (5) is processed with the opening of guiding in attachment hole (31,32) and guide member (41) and is processed into joint (40).

11, according to the fluid line coupling of the snap action of claim 10, it is characterized in that: the bar that mushroom eats shape coupling part (5) is a columniform bolt, has axial recess (56) on the circumference at the opening of top cap (39) the other end and guide member (41), in top cap (39) zone, the space that has at least a fluid to pass through.

12, according to the fluid line coupling of the snap action of claim 11, it is characterized in that: the entire cross section of bar upper notch long-pending long-pending equating of entire cross section of passing through with top cap regional fluid basically.

13, according to the fluid line coupling of the snap action of claim 10, it is characterized in that: coaxial second hole (35,36) and attachment hole (31,32) link to each other, two holes (31,32,35,36) top cap (39) downside (59) stopping part between is the form of step (42) in the form of a ring, opening and guide member (41) extend in second hole (35,36) in coupled situation.

14, according to the fluid line coupling of the snap action of claim 13, it is characterized in that: top cap (39) can be in second hole (35,36) move in, the coil of spring (6) is made spiral spring, it nestles up second hole (35,36) on, reduce the resistance that second hole (35,36) inner fluid flows like this.

15, fluid line coupling according to the snap action of claim 8, it is characterized in that opening and guide member (41) stretch out attachment hole (31 in coupled situation, 32) outside, two sealing components (2,3) each has an annular protruding portion (21 at least, 22,23), cooperatively interact with sealing means in coupled situation, be in the annular protruding portion (21 of mutual sealing state, the axial length of surface of contact 22,23) stretches out the twice of the outer length of attachment hole (31,32) (b) when the coupled situation greater than opening and guide member, drawing back and be connected sealing component (2 like this, 3) time, fluid can not run out of in pipeline and/or sealing component (2,3).

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