FR2471541A1 - STOP VALVE OR MIXER - Google Patents

Abstract

THIS TAP INCLUDES A BODY 1, INSIDE WHICH ARE MOUNTED TWO FLOW ADJUSTMENT ORGANS, ONE ROTARY 15 AND THE OTHER FIXED 10, WHICH ARE IN CONTACT WITH ONE ANOTHER BY FLAT RESISTANT SURFACES. WEAR AND IN WHICH ARE HOLES 25, 30, WHICH COOPERATE TO INTERRUPT, RESTORE OR ADJUST THE FLUID FLOW. IT IS CHARACTERIZED IN THAT EACH RECESS 25, 30 HAS AT LEAST ONE EDGE COMPLIANT AS AN ARCHIMEDAL SPIRAL IN RELATION TO THE CENTRAL AXIS OF THE CORRESPONDING BODY AND IN THAT THE EDGES SO CONFORMING CORRESPOND GEOMETRICALLY BETWEEN THEM IN PAIRS. THUS A CONSIDERABLE REDUCTION IN OPERATING NOISE ON OPENING AND CLOSING IS OBTAINED.

Description

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  The present invention relates to a shut-off valve or mixer comprising a valve body, inside which are mounted two flow control members, one rotating and the other fixed, which are in contact with each other. other by flat surfaces resistant to wear and in which recesses are provided for the aforementioned adjustment. A shut-off valve of this type is known; it is described in the Swedish patent NI 82 990. In this apparatus,

  a plate of a given material, in which is

  a reniform opening for flow control, is

  fixed head in the valve body, while another

  plate, made of a different material and equipped with a

  flow control opening which extends in the peri-

  phérique and whose width decreases in the same direction, is mounted mobile in said body. This known faucet features

  additionally a handle, with a maneuvering rod which

  at the center of the fixed plate and which is linked to the

  movable plate so that the rotation of the latter provokes

  that, according to its meaning, the closure or opening of the

binet.

  Another tap of this type is described in

  Danish patent application NI 125/79 of 11.1. 1979 on behalf of

  the Applicant. In this tap, the recesses of

  flow are defined by arcuate edges extending coaxially with the corresponding members and

  by radially extending edges.

  During work to further improve the latter valve, it has been found that there are noise problems that are believed to be related to the shape of the adjustment recesses.

  The invention therefore aims to overcome this inconvenience.

* Come on.

  It consists for this purpose in that in a tap of the aforementioned type, each flow regulation recess has

  at least one spiral shaped edge of Archimedes with

  port to the central axis of the corresponding organ and the

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  thus shaped edges correspond to each other in pairs.

  The term "Archimedean spiral" as used

  in this paper, applies to a selected curve.

  trimmed by the corresponding center by a distance which, for a rotation of a constant angle, increases by one

  It has been found that by using this form

  In particular, a considerable reduction of the operating noise is obtained, in particular during the opening and / or closing of the tap, which is explained by the fact that at the beginning of the opening and / or at the end from the closure an elongated slot is formed between the Archimedean spiral shaped edges and that the width of this slot, immediately before the complete closure or immediately after the beginning of opening, is constant over the entire length thereof, of so that energy

  corresponding to the pressure drop in the tap is re-

  part evenly along the elongated slot and

  dissse thus in a much quieter way.

  To achieve this result both at the beginning of the opening and at the end of the valve closing movement, an embodiment of the invention is characterized in that at least one of the flow control recesses is defined by another Archimedes spiral-shaped edge with respect to the central axis of the corresponding member and that the two edges of the recess thus shaped

are geometrically similar.

  In an embodiment still different from a

  stop valve according to the invention, each of the edges

  Archimedic spiral formed extends approximately from a point adjacent to a central passage to a point adjacent the periphery of the respective adjusting member. With this arrangement, we give to the slot

aforementioned a maximum length.

  In this respect and in the case of a mixing faucet

  at least one of the spiral shaped edges of

  of each adjustment recess can extend over a

  angle of about 900 around the center of the respective organ.

  Anyway, 1 invention will be well understood at 1 '

  using the description which follows, with reference to the drawing

  schematic annexed, representing, as examples not

  two embodiments of this faucet.

  Fig. 1 is an axial sectional view of an embodiment of a stopcock according to the invention, but in which the shape of the body, in the case of a mixing valve, is indicated in broken lines; Fig. 2 is a sectional view along IV - IV of freezing

  1, for a shut-off valve represented in the open position

  complete ture; Fig. 3 is a sectional view similar to FIG. 29 but showing the shut-off valve in the fully closed position, FIG. 4 is a sectional view IV - IV of FIG. 1, for a mixer tap stands in the position

  occupies when one of the inlet ports is complete-

  open and when the other inlet is about to open; Fig. 5 is a sectional view similar to FIG. m, But representing the mixing valve in the position where its

  two inlet ports are closed.

  In the figures, reference numeral 1 denotes the valve body, which, when it belongs to a shut-off valve (in solid line with the pin 1), is provided with a connection 2,

  which extends on the side, and another connection 3, which

  tends to the bottom.When it belongs to a mixing faucet

  In addition, the valve body 1 additionally comprises a further connection

  side cord 4, drawn in broken lines in Figure 10 In the case of a stop valve the direction of flow of the liquid through the tap is indifferent and 19on can choose as input as the vertical connection 3 that

  side connection 2. In the case of a mixing faucet

  the two side connectors 2 and 4 are used together

  I entered, while the fitting facing down 3

provides the outlet port.

  The connection 3 communicates with a conduit 5 which is

  tends centrally through the body 1 and at its end

  upper, opens into a passage 6 for the fluid.

  Each of the two lateral connectors 2 and 4 communicates with a respective angled duct 7, 8, which opens next to the passage 6. At its upper part, the valve body 1

  form a collar 9, in which is mounted a control member

  setting of the flow constituted by a disc 10, which presents

  a lateral projection 11, which engages in a groove a-

  the corresponding xiale 12 (fig 2) of the inner face of the collar

  let 9, thus immobilizing the disk 10 in the perimeter direction

  pheric. Seals 13 and 14 seal between the disc 10 and the valve body 1, to prevent the fluid exiting the passage 6 to flow through this place

  to ducts 7 and 8 and, between them, to the outside

  passing between the peripheral face of the disc and

the inner face of the collar 9.

  Above the flow control member 10 is disposed another adjusting member, also in the form of a disc 15, in the upper face of which is recessed

  a sliding ring 16 which cooperates with a

  similar slip 17, mounted in the upper section

  The valve body 1 is provided with a cover 18 held in contact with the ring 17 by the

  upper edge 12, folded inwards, of the collar 2.

  The ring 17 is thus pressed against the ring 16, which applies the disc 15 against the disc 10, so that the latter is pressed against the seals 1 and 14. The cover 18 is provided with a central opening for the passage of an operating rod 20, at the upper end of which is fixed a handle 21. On its lower end face the rod 20 has a rib 22, which engages in a diametrical groove of the upper face of the disc 15 , the rotation of the latter may

  thus be controlled by the handle 21.

  In the case of a simple shut-off valve (Figures 2 and 3), the fixed adjustment member 10 is provided, in addition to

247-1541

  a central passage 24, a flow control recess, which is located on the side of the central passage 24 and communicates with the conduit 7. The shape of the recess 25 is clearly distinguishable in Figure 2. Inward this recess is delimited by an edge 26, which describes a spiral around the central axis 27 of the valve body, and

  the geometric shape of this spiral is that of a spiral

  Archimedes, that is to say, a curve separated from the axis 27 by a distance which, for a rotation of a constant angle of the vector which connects the curve to the axis, increases

  of a constant value. This curve can also be de-

  finished as being generated by a point displaced by the combination of a uniform motion around a fixed point and another uniform motion away from that fixed point. In the embodiment shown in FIGS. 2 and 3, the edge 28 which delimits the recess 25

  outward is also in the form of a spiral of Ar-

  chimed, that is to say presents the same form of spiral

that the edge 26.

  In the face of the adjustment member 15 which is rotatable

  An adjustment recess 30 is provided towards the adjusting member 10. The shape of this recess 30 for a shut-off valve is clearly shown in FIGS. 2 and 3.

  of a general dome shape, with a flat ceiling 31

  sible in Figure 1, whose transition to the wall

  Ripheric is very progressive. The projection of this.

  wall on a horizontal plane is visible in FIGS.

  3. We can see that this projection also describes a spi-

  from a point 32 to a point 33, to form an adjusting edge 30a, which also constitutes an Archimedean spiral of the same pitch as those that represent the edges 26 and 28. The radial distance between the points 32 and 33 resulting from the configuration of the edge 30a is greater than the maximum width of the recess 25

  and the maximum radial distance between the wall of the recess

  30 and the central axis 27, which corresponds to point 33, is equal to or greater than the minimum distance between

the axis 27 and the edge 26.

  The valve shown in Figures 2 and 3 operates as follows:

  As mentioned above, Figure 2 represents

  the valve in fully open position, in the-

  the edge 28 of the recess 25 is in the food

  the corresponding part of the peripheral wall.

  The closure of this valve is obtained by rotating the disk 15 in the direction of the arrow 3 in FIG. 2, which brings the adjustment edge 30a constituted by the wall of the recess 30 to overlap the recess more and more, as shown by the broken line

  'and, because of the spiral shape used, the

  This overlap is constant throughout the

  25. This state continues until the member 15 completely covers the recess 25 and, in this respect, it should be pointed out that the width of the slot defined between the edges 26 and 30a is substantially constant over the entire length of it immediately

  before the tap is completely closed. As a result,

  energy released by the pressure drop inside the rock

  binet is, in particular when it reaches its maximum, that is to say at the end of the closing movement, distributed

  the entire length of the slot and, therefore, on all

  the length of the edge 26. It will be understood that the same phenomenon

  leads will occur at the very beginning of the opening, if one

  rotate the member 15 in the anti-clockwise direction to

  shot from the position shown in Figure 3.

  In the embodiment shown in FIGS. 2

  and 3, the wall of the recess 30a, viewed in a holographic projection

  in the form of an Archimedean spiral along its entire length, with the exception of the shoulder between points 32 and 33. However, since it is mainly the conditions which prevail at the beginning of the opening and to the

  end of the closing which causes noise, we understand

  it is sufficient to give the Archimedean spiral form to the inner edge 26 of the recess 25 and to the wall part j2a which cooperates with it at the beginning of the opening and

at the end of the closing.

  As has been stated above, FIGS. 4 and 4 show an embodiment of the invention suitable for a mixing valve and, accordingly, the valve body 1 is provided with two lateral connectors 2 and 4.

  Moreover, the direction of the flow of the fluid through the valve

  net is finished in advance, it is represented by arrows 40 in Figures 4 and 5o In this form of

  w execution, the fixed adjustment body 10 is provided, to re-

  debit flow, two recesses 41 and 42, each of which communicates with a respective duct 7 or 8. Each of these two recesses 41 and 42 is defined by two edges 43 and

  44 (Fig. 4), which have the shape of spirals of Archimedes geo-

  metrically similar. Since two recesses are required, the edges 43 and 44 are shorter than

  the edges 26 and 28 of the recess 25 in the executing form

  described with reference to Figures 2 and 3, which extend at an angle of about 1800, while the edges

  4 = and 44 in figs. 4 and 5 extend only about 90.

  The rotary adjusting body 15 is, in these figures, provided with a recess shown in horizontal projection. In this case too, the recess of the rotary member 15 has a flat bottom and, thereforeD does not extend to the upper face of said body. From a central passage 46, the recess of the member 15 extends in the form of hooks in two opposite directions to form two recess portions 47 and 48, each of which is defined by two edges 49 and 50 (FIG. 5), which have, on the largest

  part of their length, a form of spiral correspon-

  to edges 4 and 44. This does not apply

  however, at the inner ends of the

  47 and 48, that is to say at the places where they

  in the central passage 46. To the outside, the void portions 7 and 48 are defined by wall portions 51 and 52, each of which describes an arc of

  circle and are coaxial with the corresponding edges of e-

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  vidings 41 and 42 of the fixed member 10.

  The recess portions 47 and 48 are staggered

  gularly 1800 relative to each other, which obviously does not apply to the recesses 41 and 42, the latter being angularly offset relative to each other so that when one of the parts ( 48 in Fig. 4) completely covers the recess 42, the other portion 47 has a slight offset from the other

recess 41.

  It will be easy to understand how the valve works.

  shown in Figures 4 and 5 with reference to the ex-

  related to that of the faucet described in

  this in figs. 2 and 3. It should be noted, however, that when the upper member 15 is rotated in the direction of the arrow 54 from the position it occupies at the

  Figure 4, there is a beginning of opening of the recess-

  41 along the entire length of one of the edges thereof to produce a slot whose width is constant over its entire length, and at the same time there is a beginning of closure of the other recess 42, with strangulation of passage of the fluid from the connector 2. Thus a gradual mixing of the water is obtained - for example, which arrives through the connection 2, with water, for example, which enters

  connection 2, the resulting water mixture leaving the

  net by the fitting 3 facing downwards. When the

  41 is completely open, the recess 42 is closed,

  this closure producing an increasingly narrow cleft

  but constant throughout its length, as explained above. The valve is shown in the closed position in FIG. 5, in which it can be seen that the recess portion 48 can be placed between

  the two recesses 41 and 42 of the fixed member 10.

  As a result, because of the spiral shape of the two opposite edges of each of the two recess portions

  47 and 48, and recesses 41 and 42 of the form of

  tion shown in FIGS. 4 and 5, a reduction is obtained.

  noise-both on opening and closing

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  recesses of the fixed member 10.

  It will be understood that in the two embodiments described here the faces of the two members 10 and 15 facing each other are completely flat and rectified so that they can, cooperatively, establish a watertight contact. along the edges of the recesses. The said

  organs may be made, for example, of a material

  sintered ramic material or a corresponding material capable of

  ter to wear which can be given the flat shape neces-

  to achieve the desired sealing effect.

Claims (5)

- CLAIMS -   1.- stop valve or mixer, comprising a valve body (1), inside which are mounted two flow control members (10,15), one rotatable (15) and the other fixed (10) which are in contact with one another by flat surfaces which are resistant to wear and in which recesses (25; 41,42 and 47,48) are provided for the above-mentioned adjustment, characterized in that each adjustment recess (25; 41,42 and 30; 47,48) has   at least one edge (26,28,30a, 43,44,49,50) shaped   of the central axis (27) of the corresponding member (10 and 15, respectively) and in that   that the edges thus shaped correspond geometrically between them in pairs.   2. A valve according to claim 1, characterized in that at least one of the flow control recesses   is defined by another spiral shaped edge of Archimè-   relative to the central axis of the corresponding member and in that the other two edges (26,28; 43,44; 49,50)   of the recess thus shaped are geometrically   lar. 3.- Tap according to claim 2, characterized   in that each of the spiral shaped edges of Archimè-   extends approximately from a point adjacent to a central passage (24) to a point adjacent to the   periphery of the respective adjusting member (10, 15).   4. A valve according to claim 1, characterized in that at least one of the edges (26 or 28) shaped spiral Archimedes extends along an angle of about   180 about the center (27) of the control member   tif. 5.- Tap according to claim 1, characterized   in that the Archimedes spiral shaped edge of each   that adjustment recess (41,42) extends over an angle of about 90 about the center (27) of the adjusting member respective (10).