DE2521878A1 - Non-return valve with moulded rubber valve head - has plate spring clamped between two halves of housing - Google Patents

Abstract

The non-return valve housing consists of two smaller parts (14, 15) of cylindrical form and one (14) is provided with an annular recess (28) to receive the tongue (27) of the other part (15). The valve head (13) is moulded from rubber and has a lip (31) which sits on the inner surface (41) of the lower part (15). The valve head is supported by a plate spring (12) which is clamped between the joint faces (29, 30) of the housing (14, 15). The plate spring (12) is provided with a number of slots (34) in the form of circular arcs separated by radial bridges. These slots provide flexibility and also provide passageways for the air. The non-return valve is for use with vacuum installations on motor vehicles.

Description

Daimler-Benz Aktiengesellschaft Daim 10

Stuttgart-Untertürkheim May 12, 1975

"Check valve"

The invention relates to a check valve, the movable valve body of which is guided by a leaf spring and is pressed against the valve seat. In a known such check valve (DT-Gbra 1 632 262) is the Valve body riveted to a strip-shaped leaf spring, the upwardly bent ends of which overlap and form a Form elliptical ring with a screw, which is designed as a stop for the valve body, on a is attached to the housing arranged support arm. This check valve is relatively complex and stressed lots of space, as a result of its strongly curved and easily deformable Leaf spring, which is held at a point that is narrowly limited in relation to its large extent, has this check valve has the further disadvantage that the acting on the valve body when opening and closing The pressure of the leaf spring can only be determined imprecisely. However, it can be precisely adhered to, especially in control systems built-in valves, be of great importance.

The invention is based on the object of eliminating these deficiencies and a simple and precisely acting check valve to accomplish. This is done according to the invention in that the valve body of a substantially flat, annular leaf spring provided with through openings is held, the inner edge of which the valve body surrounds and its outer edge in the parting line of a

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two-part valve housing is clamped. The ring-shaped leaf spring held on its entire circumference allows a precise definition of the opening and closing pressure. Due to its low mass, the ring-shaped leaf spring speaks quickly reacts to changes in pressure, if desired. In addition, the check valve is characterized by its simple and space-saving construction.

According to the invention, the valve body made of an elastic material has one end face an annular sealing lip and on its other end face an annular surface and a central cylindrical one Approach on which the leaf spring is arranged with radial bias so that it is in the region of its inner edge rests against the ring surface. These measures make a connection that is particularly simple and inexpensive to produce achieved between the valve body and the leaf spring, which ensures a reliable transmission of the opening and closing forces enables.

According to a further advantageous embodiment of the invention, the through openings of the leaf spring consist of concentric annular gaps which are provided with radial connecting webs that are offset from one another. One Such a shape of the through openings allows an ample flow through the valve with a reliable one The leaf spring is supported by the connecting webs. By choosing the dimensions of the annular gaps of the leaf spring a spring characteristic adapted to the operating conditions is obtained.

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- 3 - Pail 10 263A

According to the invention, the housing of the non-return valve can be made from consist of two hollow cylindrical parts, the jacket of which overlap and which have opposite annular surfaces in the inner region of the parting line, between which the leaf spring is clamped. As a result, the leaf spring is fastened in the housing in a simple manner. The two Parts of the housing can be kept small.

The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing. It demonstrate

Fig. 1 is a longitudinal center section through a check valve and

Fig. 2 shows a cross section through this check valve along the line II-II of Fig. 1.

The check valve consists of a valve housing 11 made of plastic, in which a valve body I3 made of rubber, held by a leaf spring 12, is arranged.

The valve housing 11 is made up of two hollow cylindrical housing parts Ik and I? composed, which are each formed from a base l6 or 17 and from a jacket l8 or 19. Ih bottom l6 and 17 of the housing parts 14 and 15 is a central opening 20 and 21, respectively, to which a pipe socket 22 and 23, respectively, connected in one piece to the base, with a line 24 and 25, respectively. The hollow cylindrical housing parts Ik and 15 are plugged into one another in such a way that their jackets l8 and 19 overlap. The includes

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slightly protruding outer edge 26 of the jacket 18 of the housing part l4 the jacket 19 »while a ring strip 27 on the front side of the jacket 19 engages in a corresponding annular groove on the front side of the jacket 18. As a result, the two housing parts 14 and 15 are centered and their parting line is sealed like a labyrinth. In the inner region of the parting line, the end faces of the jacket 18 and 19 have annular surfaces 29 and JO which lie opposite one another. The two housing parts 14 and 15 are firmly connected to one another by welding.

The valve body 13 has a substantially cylindrical shape. On one end face de, s valve bodies 13 is a annular sealing lip 31 arranged, the cross-sectional area of which is triangular. The other face has a Annular surface 32 and a central cylindrical extension 33 on.

The leaf spring 12, which is flat in the relaxed state, is annular and has openings Jk for the medium flowing through the valve housing 11 to pass through it. The openings 34 consist of three concentric annular gaps 35 «36 and 37» which are each provided with four radial connecting webs 38. The connecting webs 38 of the central annular gap 36 are offset by 45 degrees with respect to those of the inner and outer annular gaps 35 and 37, respectively.

The leaf spring 12 is arranged on the cylindrical extension 33 of the valve body I3. The diameter of the extension 33 is slightly larger than the _{b in the relaxed state}

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- 5 - Daim IO 2β3 / 4

Inner diameter of the annular leaf spring 12, so that it sits on the shoulder 33 of the elastic valve body 13 is held with radial bias. In the area of its inner edge 39, the leaf spring 12 rests on the annular surface 32 of the valve body 13. With its outer edge 4θ the leaf spring 12 is clamped between the annular surfaces 29 and 30 of the two housing parts l4 and 15. Included In the region of its inner edge 39, the leaf spring 12 exerts an axial effect on the annular surface 32 of the valve body I3 Pressure off, so that when the pressure in the valve housing 11 is equal, it is always connected to the sealing lip 31 as the valve seat 4l formed inner surface of the bottom 17 of the housing part 15 rests.

The check valve can be opened by attaching hoses to the pipe sockets 22 and 23 of the valve housing 11 be installed, for example, in a vacuum control system of a motor vehicle. Usually takes the check valve the starting position shown in the drawing, in which the sealing lip 31 of the valve body 13 is pressed onto the valve seat 4l and in which the connection between the lines 24 and 25 is interrupted. If the air pressure prevailing in line 25 predominates, then so the valve body I3 lifts itself under its action the pressure of the leaf spring 12 with its sealing lip 3I from Valve seat 4l from, so that air through the valve housing 11 and the openings 34 of the leaf spring 12 from the conduit to the line 24 can flow. As soon as the pressure is equalized, the check valve closes again under the action of the leaf spring 12. Due to the low mass of the leaf spring 12, the check valve speaks quickly on changes in pressure and opens or closes the connection between lines 24 and 25 practically without Delay.

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Claims (2)

- 6 - Dai «10 263A Expectations Check valve, the movable valve body of which is guided by a leaf spring and pressed against the valve seat, characterized in that the valve body (13) is held by an essentially flat, annular leaf spring (12) provided with through openings (3Ί), the inner edge of which ( 39) surrounds the valve body (I3) and its outer edge (hO) is clamped in the parting line of a two-part valve housing (II). 2. Check valve according to claim 1, characterized in that the consisting of an elastic material Valve body (I3) has an annular sealing lip (3I) on one end face and an annular sealing lip (3I) on its other end face has an annular surface (32) and a central cylindrical extension (33) on which the leaf spring (12) with radial bias is arranged so that it is in the area of its inner edge (39) on the annular surface (32) is present. 3 · Check valve according to claims 1 or 2, characterized characterized in that the through openings (3 ^) of the Leaf spring (12) consist of concentric annular gaps (35 to 37) which are offset radially and with respect to one another Connecting webs (38) are provided. k. Non-return valve according to one or more of the preceding claims, characterized in that the housing (ll) of the non-return valve consists of two hollow cylindrical parts ( Ik and 15), the jacket (18 or 19) of which overlap and those opposite one another in the inner area of the parting line Have annular surfaces (29 or 30) between which the leaf spring (12) is clamped. 609848/0470 Blank page