FR2527733A1 - MIXING VALVE AND PROPORTION ADJUSTMENT - Google Patents

Abstract

VALVE FOR MIXING AND ADJUSTING THE PROPORTION OF TWO FLUIDS OF DIFFERENT CHARACTERISTICS WHICH PASS THROUGH TWO SEPARATE ELASTIC DUCTS 4A, 4B INSIDE THE VALVE, A ROD 10 WITH VARIABLE SECTION ALLOWING TO ADJUST THE LONG PASSAGE SECTION AND EXCESSIVE LENGTH IN ROTATION. RIGID PARTS 13 ARE INTERPOSED BETWEEN THE OPERATING ROD 10 AND THE ELASTIC DUCTS 4A, 4B, THE PRESSURE ON THESE EXERCISING THROUGH THE SAID PARTS 13. THE INVENTION APPLIES PARTICULARLY TO KITCHEN MIXING TAPS OR BATHROOM.

Description

The present invention relates to a mixing and adjusting valve of

  proportion Such valves are used for the mixing and dispensing of two fluids of different characteristics The valves of this type are advantageously used, but not exclusively, as a component of bathroom taps.

  and cooking, to mix in selected proportions

  hot water and cold water.

  The old mixing blocks included two separate valves, for example one for hot water and one for cold water, each of which was independently regulated.

  one another, a separate maneuvering room, for ex-

  a faucet handle, being provided for each

  The user had to maneuver manually and separately

  each of the faucet handles and was to determine

  separately the degree of opening and closing of the valves.

  Newer and more advanced mixing valves

  are designed with a single actuator that controls both the flow of the two fluids and determines

  also the relationship between these flows.

  It is already known to incorporate in the metal blocks

  the latter type of elastic tube lengths.

  ticks, which constitute a part of the conduits guiding the two fluids to an outlet, and to provide means that exert pressure on these elastic parts, so as to partially or completely close their internal passage It is also known to use, as means

  exerting pressure, a stem with decreasing section decays

  longitudinally and rotatably

  turns it, exerts lateral pressure on the said parts

  elastic elements of the outlet ducts and increases the

  the closing of a conduit of the same value as the

  opening of the second conduit.

  There are a large number of constructions used

the arrangement above.

  It has been found that the known constructions do not

  not sufficiently and accurately establish a detailed report

  between two fluids to mix In addition, the long-

  elastic ducts are subject to wear, to a high degree, due to compression by the rod

  conical and friction with it.

  The subject of the present invention is a proportion mixing and proportioning valve for incorporation into a mixing block which provides high accuracy

  the degree of opening and closing of the two

  and precision in the determination of the

  ratio between the two respective fluids.

  According to the invention, this object is achieved if, instead of placing the conical actuating rod directly in contact with the elastic parts to subject them in this way to a crushing pressure, rigid non-elastic elements are interposed between the rod. conical

  elastic parts, which provides the correct accuracy

  This result is attributed to the fact that

  of pressure transmission can be designed with

  a form such as pressure, which is a factor

  both, is exerted on a relatively small surface of the elastic piece, compared to the larger surface

  which is exposed to the conical stem itself.

  The invention will be better understood in the light of

  the description of its nonlimiting embodiment,

  shown in the accompanying drawings.

  Fig 1 is a side view of the valve-according to the invention, partially in vertical section; Fig 2 shows the same valve, turned 45, that is to say in horizontal section; and FIG. 3 is a section along line III-III of FIG.

Figure 2.

  The valve body, generally designated by the mark 1, is connected to the pipes (not shown) of distribution of the two fluids, for example hot water and cold water, by a nipple 2 in which are provided two ducts. The latter communicate, via short bores 3a and 3b, with elastic tubes 4a and 4b. The latter comprise in their center a thicker portion 4, swollen towards In this way, a venturi neck 6 is formed in the tubes 4a and 4b. The tubes comprise, at their two ends, flanges 7, so that they are firmly held in the body 1. tubes 4a and 4b can be inserted and held in place in the

  body 1, this is done in practice in three parts.

  parts: an intermediate part la, which includes

  sages forming the seats of the tubes 4a and 4b, and two parts

  end portions 1b and 1c.

  carries an outlet 8 which communicates with the tubes 4a and 4b via a chamber 9 from which

  they flow into a mixing chamber.

  A cam-shaped rod 10 is arranged symmetrically

  The handle 10 'of the rod protrudes outwardly so that it can rotate or axially move the cam rod 10. The active part of the cam rod 10 is profiled as follows A half of the rod, on one side of a longitudinal median plane (designated p in FIG. 3), is delimited by a cylindrical surface C, while

  the other half, on the other side of the plane y, is defined

  denoted by the surface t of a truncated cone One can turn the cam rod 10 and move it axially in

  the direction of the arrow in Figure 1.

  The cam rod 10 is placed in a bore

  11 From it start two bores 12 headed respectively

  4 in each of the derived bores 12 is guided a cylindrical piece 13 This piece 13 is in contact with a tube 4, at one of its ends,

  and with the cam rod 10 at its other end

  which is in contact with the sleeve may be

  ne or spherical and the end in contact with the stem

Cam is spherical.

  The valve according to the invention operates as follows. The two fluids penetrate through the inlets 2a and 2b respectively and flow towards the tubes 4 In order to obtain the desired mixture, the passage in the tubes can be adjusted and fixed between two extreme positions,

  that is to say the complete opening and the complete closure

  te, and of course to an infinite number of international positions

  When a tube 4 closes, the other opens the same amount, depending on whether the cam rod 10 is pushed

as a result.

  inward or outwardly / "higher" or "lower" part of the cam surface is in contact with one of the parts 13 and throttles one of the tubes 4 to a degree more or less big

  time, the cylindrical surface of the rod 10 acts on the

  piece 13 and push it all the way against the

  FIG. 3 illustrates an example of the position of the two tubes 4. In this case, the cam surface t acts on the part 13 which comes into contact with the tube 4a to close the passage of a small quantity, while the cylindrical surface c acts on the second piece 13 which

  press the tube 4b completely to close the passage.

  As shown in FIG. 3, in practice, the portion 1a of the body is also composed of several parts, to allow the manufacture of the bores 12 and

insertion of parts 13.

  It is understood that modifications of detail may be made in the form and construction of the device according to the invention without departing from the scope

of it.

2527733-

Claims (4)

claims   1 Proportional mixing and proportioning valve for controlling the flow of two different fluids flowing through two separate elastic and flexible ducts (4a, 4b), a rod (10) of decreasing section, longitudinally displaceable and rotatable , being pre-   view to adjust the section of passage through the con-   elastic and flexible products, characterized in that   rigid parts (13) are interposed between the rod of   (10) and the ducts (4a, 4b), so that the pressure on the elastic and flexible ducts is   exerted through the rigid parts interpo- Sees.   2 Mixing and proportioning valve   Claim 1, characterized in that the parts (13) are cylindrical and have a spherical end face.   3 Mixing and proportioning valve   Claim 1 or 2, characterized in that the flexible and resilient conduits (4a, 4b) comprise end collars (7).   4 Mixing and proportioning valve   one of claims 1 to 3, characterized in that   that the flexible ducts (4a, 4b) have thicker central portions (5) constituting passages of venturi (6).   Mixer block, characterized in that it comprises mixing valves and proportion adjustment following   any one of the preceding claims.