FR2527300A1 - REVERSIBLE CONNECTION FOR FLUID - Google Patents

Abstract

A. THE SUBJECT OF THE INVENTION IS A FITTING INCLUDING A VALVE PROVIDED IN A FEMALE ELEMENT AND MOVED BY A MALE ELEMENT, WHEN THE TWO ELEMENTS ARE CONNECTED TO ONE ANOTHER, TO BACK THE VALVE AGAINST THE ELASTIC FORCE OF A HELICAL COMPRESSION SPRING WITH A VIEW TO MOVING THE VALVE AWAY FROM ITS SEAT TO OPEN A FLUID PASSAGE AND TO CREATE A FREE SPACE BETWEEN THE SPIRES NEAR THE HELICOID COMPRESSION SPRING TO DELIVER THE FLUID PASSAGE. B. THE COMPRESSION COIL SPRING 20 INCLUDES A FRONT END ELBOWED AND EXTENDING THROUGH A VALVE CHAMBER 12. THIS PORTION CONSTITUTES A REGULATION PORTION 26 INTENDED TO ESTABLISH THE FAREST POSITION OF THE VALVE 17 AT THE INCOMPLETELY COMPRESSED CONDITION OF THE COMPRESSION SPRING 20 TO ALLOW THE FLUID TO FLOW FREELY IN A FIRST DIRECTION AND IN REVERSE DIRECTION. VALVE 17 INCLUDES A VALVE STEM 19 PROJECTING TOWARDS THE COMPRESSION SPRING 20. A FIRST END OF THE COMPRESSION SPRING 20 COOPERATES WITH A PORTION OF THE VALVE STEM 19. THE REGULATING PORTION 26 OF THE SPRING 20 COOPERATES WITH A SECOND PORTION OF THE VALVE STEM 19. APPLICATION: FITTING FOR FLUID LINES.

Description

25273,000

  The present invention relates to a reversible connection for fluid. In a known type of connection, a valve disposed in a female element is urged by a male element, when the elements are connected to each other, to push back the valve against the elastic force of the valve. a compression coil spring for the valve to move away from its seat to deliver

  passage to a fluid A free space allowing free circulation

  fluid exists between the neighboring turns of the coil spring.

  This type of connection is shown in FIG. 1, for example, where the flow direction of the fluid is

  predetermined, the fluid flowing from the female element 1 in direc-

the male element 5.

  Therefore, if such a fitting is mounted on a circuit to

  fluid in which the direction of flow is reversed, a counter-

  fluid pressure is applied to the valve 3 when the direction of flow is reversed It is common practice to use such a fitting in a system where the fluid pressure is greater than the spring constant of a coil spring The valve 3 is thus easily retracted when the back pressure is applied to the valve 3.

  helicoidal compression spring 4 is completely compres-

  and in close contact with its seat, which poses a problem in that the spring 4 closes the fluid passage. Therefore, a known type of connection has a drawback in that it only applies to a circuit fluid in which the fluid flows

  in a predetermined direction and can not be used in a

  cooked where the fluid can flow in both directions.

  To eliminate this drawback, it has been proposed that a ring for determining the most remote position

  of the valve 3 is mounted in a valve chamber 2 in order to

  the compression coil spring 4 to come into full contact with its seat. However, these means translate

  inevitably by reducing the flow of the circulating fluid.

  In addition, there is a problem as regards the cost price of such a connection because it is impossible to assemble such a connection automatically, this assembly making

call for manual work.

  Given the fact that the so-called "one-way" connections, including a valve open by the biasing of a male element, does not allow to reverse the flow direction of the fluid and also has problems compared to an automatic assembly It is an object of the present invention to provide a coupling which overcomes these disadvantages. The present invention allows the fluid to flow freely without any decrease in flow whatever the flow direction of the fluid in the fitting, which

  simplifies construction and reduces the cost of manufacturing.

  According to a feature of the device according to the invention, the front end of the compression coil spring is bent so that a portion extends across a valve chamber, which allows to use this portion as a portion of regulation intended to determine the most retracted position of the

  the incompletely compressed state of the compression spring.

  According to another characteristic of the invention, the same effect is obtained by spirally shaping the front part of the compression spring. An embodiment of the present invention is hereinafter described by way of example with reference to the accompanying drawings, in which: FIG. 1 is a longitudinal side elevational view;

  and in section of a fluid coupling according to the prior art

  laughing; Figure 2 is a longitudinal side elevational sectional view of a first embodiment of the present invention; Figure 3 is a perspective view on a larger scale of the helical compression spring which is an essential part of the device according to the invention; Figure 4 is a longitudinal side elevational sectional view of a second embodiment; Figure 5 is a longitudinal side elevation and sectional view of a third embodiment; and Figs. 6 (A) and 6 (B) are sectional views of the coil spring

  compression equipping this third embodiment.

  FIGS. 2 and 4 show a female element 11 comprising

  A valve seat 14, which is in communication with a fluid passage 13 of the element 11, has a chamber 12 in which a valve seat 14, mounted in the passage 13 of the element 11, comprises a central opening 16. communication with the passageway 13 At the inlet of the female element 11, near the insertion zone of a male element 15, there is provided a housing 12. A valve 17, housed in the chamber 12 of the female element

  11, can slide in the direction of flow of a fluid.

  The shutter 18 protrudes from the front portion of the valve 17 towards the receiving inlet of the male member 15. A valve stem 19 extends from the rear face of the valve 17.

  in the opposite direction of the flow of a fluid.

  A conical compression spring 20 is arranged in the compressed state in the valve chamber 12. This compression coil spring 20 comprises a small end 21 which bears in an annular groove 22 provided at the base of the

  valve stem 19 which protrudes from the rear face to the valve

  The compression spring 20 comprises an end 23, of larger size, bearing on a spring seat 24 provided at one end of the valve chamber 12. The spring 20 pushes the valve 17 towards the orifice of the valve. The insertion of the male element is followed by the insertion of the male element. More precisely, the valve 17 is urged towards the receiving orifice of the mixed element 15 under the action of the compression spring.

  disposed in the valve chamber 12 for the valve 17 to take

  does not bear on the valve seat 14, when the female element and the male element 15 are not connected The valve 17 closes the passage 16 of the valve to thereby close the fluid passage 13 of the female element 11 cons when the female element 11 and the element 15 are connected to each other, the valve 17 is displaced by the male element 15 against the elastic force of the compression spring 20 exerted on the valve 17 moves it from its seat 14 to open the fluid passage 13, the fluid can then circulate between the

  turns of the compression spring 20.

  The front portion 23 of the compression spring 20, part of-

  it is bent to make a part 25 extending through the valve chamber 12, and thus through the fluid passage 13. This part 25 is directed towards the spring seat 24 of the chamber 12, diametrically opposite side, through the larger end of the compression spring 20 and comprises at its center a regulating portion 26 intended, in the most compressed position of the spring 20, to maintain it in the incompletely compressed state of the does she enter into

  contact with the front end of the valve stem 19 of the

  pope 17 when it is subject to a force tending to the

  move back too far against the elastic force of the spring 20.

  We specify that the most remote position is a position

  to which the valve 17 is moved to the left on the

  2, towards the position shown, against the elastic force of the spring 20 until opening of the fluid passage 13. The adjacent parts, that is to say the turns, of the compression spring 20 are compressed during of the opening of the valve 20 but are not brought to the fully closed state The turns

  leave spaces 27 between them where the fluid can flow.

  Therefore, the position thus defined is a limit position for which the fluid passage 13 of the female element 11 is not closed by the compressed spring 20 but can ensure a normal flow of the fluid Thus, the valve 17 is prevented to move away from its seat 14 more than a predetermined distance from the

  its most remote position is determined as the world's

see Figure 2.

  According to another embodiment shown in FIG. 4, the regulation portion 26 of the compression spring 20 receives a particular shape. The larger end 23, intended to be applied on the seat 24 in the valve chamber

  12, is bent, the end portion 25 being bent in its central

  to give it an angular shape directed towards the seat of

  spring of the valve 17 in order to produce a portion of regulation

  26 'at its summit Thus, the valve stem 19' making

  on the rear face of the valve 17 may be shorter than the valve stem 19 of the previous embodiment shown

  in Figure 2, and comes to lean against the portion of regulation

  26 ', as already described. This regulating portion 26' makes it possible to prevent the total compression of the spring 20. In addition, although it has not been shown, the regulation portion 26 made on the section 25 end of the spring

  , shown in FIG. 2, can be wound concentrically

at the end 23.

  In FIGS. 2 and 4, locking screws 28 are mounted

  in the female element 11 and a sleeve 29 slides axially-

  on the female element 11 to exert pressure on the locking balls 28 A spring 30 serves to urge the sleeve 29 in a direction to exert pressure on the balls

  28; a circumferential groove 31 is hollowed in the periphery

  outside of the front end of the male element 14 which

  receives and retains the locking balls 28.

  We will now describe the operation of the device con-

form to the invention.

  The sleeve 29 is moved to the left, looking at the

  2, against the elastic force of the spring 30 for

  Then, the male element is introduced into the insertion orifice of the female element 11 so that the female element 11 and the male element 15 are connected to each other. in fact, the front end of the male element 15 comes into contact with the valve 17, disposed in the female element 11, and pushes it back against the elastic force of the spring

  to move the valve 17 away from its seat 14 to open the step

  fluid wise 13 of the female element 11, as seen on the

figure 2.

  At this stage, the female element 11 and the male element 15 have their fluid passage in communication with each other and the locking balls 28 and the annular groove 31 cooperate between

  If the operator then releases the sleeve 29, he returns to his po-

  initial set under the action of the spring 30 In this state, we can Y *

  introducing a pressurized fluid, the male element 15 direc-

  The counter-pressure is applied to the front face of the valve 17. As a result, the valve 17 moves back further (to the left in FIG. 2). against the elastic force of the spring 20 until it reaches the position shown in FIG. 2 In this position, the stem of the valve 19 protruding from the rear face of the valve 17 comes into abutment against the regulating portion 26, provided at the end of larger diameter 23 of the spring 20 to determine the recoil position

  The valve 17 is thus prevented from receiving

  ler more while leaving sufficient space 27 between neighboring turns It follows that the fluid passage 13 of the female element 11 is not closed by the coil spring 20 under compression but is kept in the open state to allow fluid flow from the male member 15 towards

  the female element 11, and securely.

  In addition, if no fluid flows from the male element 15 to the female element 11, the valve 17 being biased by the front end of the male element 15 is in the open state,

  just as the valve 3 of the device of the prior art represents

  FIG. 1 The flow of the fluid, if it flows from the female member 11 to the male member 15, is not at all different from that of the prior art connector according to the present invention. , the front portion of the compression coil spring may be spiral shaped, instead of being bent

  to extend linearly We will now describe this arrangement

  which constitutes a third embodiment of the pre-

  invention, with reference to FIGS. 5 and 6A, 6B in FIG.

  which same elements have the same references.

  This embodiment is similar to the previous embodiment with the exception of the spiral extension of the front end 25 'of the spring 20. The central portion of the spiral spring' comprises in this case a regulating portion 26 intended to maintain the compression spring in the incompletely compressed state, for the most retracted position of the valve 17, to allow the fluid to circulate freely according to a first

direction and in the opposite direction.

  As can be seen in FIGS. 6A and 6B, the spiral spring can be of the flat type or of the volute type. The choice of the flat type or the volute type is a function of the length of the valve stem. We can decrease the length of the stem

  valve 19 for the case of a compression spring 20 whose ex-

  tremité before 25 'has a volute shape.

  As already described for the previous embodiments,

  The present invention relates to a coupling in which a valve disposed in a female element is urged by a male element when the two elements are connected. The valve moves back against the elastic force of a compression coil spring. away from a valve stem to open a fluid passage and allow a fluid to flow in a passage formed by the spaces between the turns neighboring the

  coil spring compression.

  The invention also relates to a reversible fluid connection in which the front end of the compression coil spring is bent so that a portion thereof extends across a valve housing chamber so as to allow this portion to be used to maintain the helical spring pressure in incompletely compressed state for the most retracted position of the valve. This results even if the fluid back pressure is applied to the valve not only in the flow direction of the fluid from the male member to the female member but also in the opposite direction, the valve can not move

  thanks to the projecting portion of the coil spring of compres-

  This portion serves to define the most retracted position of the valve. The compression coil spring is maintained in the incompletely compressed state, in which its adjacent turns do not come into close contact with one another to enough space to allow the fluid to circulate freely. As a result, the fluid passage of the female element is always kept in the open state to allow the fluid to circulate without obstruction. Moreover, because the means for determining the maximum recoil of the valve are part of the compression coil spring itself, as already described, no special parts are needed, which allows to simplify the construction in a remarkable manner to this is added the fact that the manufacture of the compression coil spring is simple even when it is an automatic assembly of the connection, no manual work being necessary

  in the manufacture of the connector, which facilitates assembly.

  Therefore, the present invention has the advantage of allowing the realization of a reversible fluid connection.

for a low cost price.

  It goes without saying that many modifications can be made to the device described and shown without departing from the scope of the invention which is defined by the

appended claims.

Claims (11)

  1 fluid connection comprising a valve which is   in a female element and which is moved by a male element, when the female element and the male element are connected to each other, to move the valve back against the   elastic force of a helical compression spring for   the valve of a valve seat to open a fluid passage and provide a clearance between adjacent turns of the compression coil spring to allow a fluid to flow therethrough.   circulate, characterized in that a front end (23) of the   helical compression fate (20) is bent so that a portion   of it extends across a housing chamber of   poppet (12), this portion constituting a regulating portion (26) for setting the most retracted position of the valve, for an incompletely compressed state of the compression coil spring (20), to allow the fluid to flow freely   in one direction and in the opposite direction.   2 connection according to claim 1, characterized in that the valve (17) comprises a valve stem (19) projecting towards the helical compression spring (20), a first end of the helicoldal compression spring (20) cooperating with a first portion of the valve stem (19) and the portion of   regulating (26) the co-operating compression coil spring (20)   with a second portion of the valve stem (19).   3 connection according to claim 1, characterized in that the control portion (26) of the helical compression spring (20) is arranged orthogonally with respect to the fluid passage (13).   Connection according to Claim 1, characterized in that the regulating portion (26) is arranged at an angle to at the fluid passage (13).   Connection according to Claim 2, characterized in that the valve stem (19) comprises an annular groove (22) intended to   receiving the first end of the coil spring of compres- sion (20).   Connection according to Claim 2, characterized in that the   second end of the helicordal compression spring (20)   takes an outer peripheral surface for bearing on a spring seat (24) disposed at one end of the valve housing (12). 7 Connection according to claim 1, characterized in that   further comprises releasable locking means (28, 31)   designed to hold the female element (11) in position relative to the male element (15).   8 connection according to claim 7, characterized in that the locking means (28, 31) comprise locking balls (28) received in operation in a circumferential groove (31) of the male element (15) to maintain in position the element   male (15) relative to the female element (11).   9 Helical compression spring for use in a fitting comprising a valve, disposed in a female member and moved by a mixing member, when the female member and the male member are connected to each other, for rolling back   the valve against the elastic force of a coil spring   compression joint to move the valve away from a valve seat to open a fluid passage and to provide a free space for fluids and to provide a free space between adjacent turns of the compression coil spring to allow passage a fluid, and a valve housing chamber (12), the valve (17) and the compression coil spring (20) being disposed in the valve housing chamber (12), characterized   in that it normally urges the valve (17) to a position   closing member against the valve seat (14) and comprising a bent portion at one end which extends across   of the valve housing chamber (12), this portion constitutes   killing a regulating portion (26) to establish the posi-   the most remote position of the valve (17), in the incompletely compressed state of the compression coil spring (20), to allow the fluid to flow freely in a first direction and in the reverse.   Spring according to claim 9, characterized in that the regulating portion (26) is orthogonally arranged by   relative to the fluid passage (13).   Spring according to Claim 9, characterized in that the regulating portion (26) is arranged at a certain angle by   relative to the fluid passage (13).   Fluid connection comprising a valve disposed in a female member and displaced by a male member, when the two members are connected to each other, to retract the valve against the resilient force of a spring helical compression device for moving the valve away from a valve seat to open a fluid passage and to provide a free space between adjacent turns of the compression coil spring to allow passage to a fluid, characterized in that front end of the helical compression spring (20) is shaped as a spiral spring (25 '), the central part of this spiral spring (25') constituting a regulating portion (26) intended to establish the most retracted position of the valve in the incompletely compressed condition of the compression coil spring (20) to allow the fluid to circulate freely   in a first direction and in the opposite direction.   13 Connection according to claim 12, characterized in that   the spiral spring (25 ') is of the flat type.   Connection according to Claim 12, characterized in that   the spiral spring (25 ') is of the volute type.