EP2585743A1

EP2585743A1 - Non-return valve for a fluid pump

Info

Publication number: EP2585743A1
Application number: EP11717594.3A
Authority: EP
Inventors: Oliver Gaertner; Daniel Gosse
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2010-06-24
Filing date: 2011-04-28
Publication date: 2013-05-01
Also published as: CN102959292A; DE102010030464A1; US20130213499A1; WO2011160874A1

Abstract

The invention relates to a non-return valve (1) for a fluid pump, in particular of a safety brake system of a motor vehicle, comprising a through-flow opening (7) which can be closed by a valve element (10), wherein the valve element (10) can be displaced against the spring force of a valve spring (11) made of coiled round wire in order to expose the through-flow opening. The round wire is coiled in one plane and is arranged with respect to the valve element (10) such that the plane extends at least substantially perpendicularly to the displacement direction of the valve element (10).

Description

description

title

The invention relates to a check valve for a fluid pump, in particular a safety brake system of a motor vehicle, with a closable by a valve element flow opening, wherein the valve element against the spring force of a valve spring from a coiled round wire for releasing the flow opening is displaced.

State of the art

Check valves for fluid pumps of the type discussed here are known from the prior art. Especially in safety brake systems of motor vehicles, such as in ABS (Automatic Braking System) or ESP systems (Electronic Stability Program)

Check valves used, to which high expectations regarding

Functionality and life are made. For example, check valves, as described in the utility model DE 90 16 775 111, used. These include a relocatable

Valve element in the form of a valve ball, which is pressed by a valve spring, which is designed as a leaf spring, against a discharge opening of a pressure channel having sealing seat. Increases the pressure in the pressure channel so far that the force acting on the ball from the side of the sealing channel is greater than the biasing force provided by the leaf spring, the

Ball lifted out of the sealing seat and released a flow area. As soon as the pressure in the pressure channel drops below a certain value, the throughflow opening is automatically closed again by the valve element acted upon by the valve spring. However, the provision of the leaf spring means a high design effort to a safe

Closing and releasing the flow opening to ensure. Alternatively, check valves are known in which the valve spring is formed by a helically wound round wire, so a

Represents coil spring. In comparison to the leaf spring, the design effort is reduced, but a relatively large axial space is required to accommodate the coil spring.

Disclosure of the invention

The check valve according to the invention, however, has the advantage that both the design effort and the required space are kept small, and yet a safe closing and releasing the

Flow opening is ensured by the valve element. The check valve according to the invention is characterized in that the round wire is wound in a plane and arranged to the valve element, that the plane extends at least substantially perpendicular to the direction of displacement of the valve element. The round wire of the valve spring is therefore not helically wound as in a helical spring, but is completely in one plane, so that the (axial) space for the round wire or for the valve spring fails low. In particular, the axial space substantially corresponds to the axially required space of the known leaf spring. By providing the meandering round wire in the plane, in particular, the design of the flow channel downstream of the valve element, that is on the valve spring side of the check valve, is simplified since the round wire itself is easily removed from the conveyed fluid

flow around and thus the valve spring is easily flowed through by the fluid. Due to the arrangement of the valve spring or the plane at least substantially perpendicular to the displacement direction, ie to the direction in which the valve element against the spring element for releasing the

Throughflow opening is displaced, a check valve is offered, which requires little space, is simple and inexpensive to manufacture, and a safe release and closing the flow opening

guaranteed. Preferably, the round wire in the plane is at least substantially

kidney-shaped, double-kidney-shaped, wavy or spirally wound. The kidney-shaped and the double kidney-shaped winding of the round wire preferably each have at least one annular region

or holding section, which serves to hold the valve spring in a housing of the check valve. Interior areas or sections of the round wire are used in particular for attachment to the

Valve member. The spiral-shaped turn of the round wire is characterized in that the winding radius steadily increases, wherein preferably at least the outer turn of the round wire forms a holding portion and is held in the housing of the check valve. The wavy configuration is characterized in that the free ends of the round wire are not arranged opposite or substantially opposite, in contrast to the previously described Windungsformen. Rather, the ends of the round wire away from each other, wherein between the round wire in the plane is wound wavy, which also provides an elastic deformability of the valve spring perpendicular to the winding plane.

Preferably, the round wire is wound in the plane such that it has at least one valve element receiving portion. Of the

Valve element receiving portion is used for receiving area by area of the valve element, which is preferably spherical, hemispherical, dome-shaped or conical. The valve element receiving portion is characterized in that it is shaped such that the valve element is aligned (radially) through the valve element receiving portion at least in the plane. Particularly preferably, the valve element has a to the

Valve element receiving portion corresponding formed trained area, so that the inclusion of the valve element in the valve receiving portion ensures and in particular the assembly is simplified.

Particularly preferably, the valve element receiving portion and / or the valve element are designed such that the valve element is partially, in particular positively held in the valve element receiving portion of the round wire. As a result, the positioning of the valve element is ensured on the valve spring. By a corresponding fastening of the valve spring in the housing of the check valve, the positioning of the valve element as a whole in the check valve can thereby be ensured. Preferably, the valve element receiving portion is at least in

Essentially centered, so centered with respect to the valve spring, so that a maximum spring force can be exploited. Are two

Valve element receiving portions, for example in a

Doppelnierenförmigen design of the valve spring provided, they are preferably arranged as close to each other and to the center of the valve spring in the plane. By providing two

Valve element receiving portions prevents tilting of the valve element during displacement by the additional contact point. Of course, other valve element receiving portions may be provided.

Particularly preferably, the round wire is held between two housing parts of the check valve, wherein at least the

Valve element receiving portion freely swinging displaced or elastically deformable. By connecting the two housing parts thus the valve element is thus aligned in a simple and safe manner in the check valve and / or held.

Preferably, at least one of the housing parts receives the round wire partially, in particular form-fitting manner. For this purpose, the corresponding housing part, for example, have a groove-shaped receptacle, in which the round wire, for example with its annular area

or holding section, can be introduced. This makes it possible to produce a pre-assembly of a housing part and the valve spring and possibly also the valve element.

According to an advantageous embodiment of the invention it is provided that at least one of the housing parts a the maximum deformation of the

Valve spring limiting stop has. The stop is arranged and / or aligned such that it prevents overstretching of the spring element and thus plastic deformation of the spring element, whereby a long service life of the spring element is ensured. Preferably, the valve spring is biased in the check valve

or held in the housing of the check valve, so that the Valve element with a biasing force in its closed position for

Closing the flow opening is acted upon to ensure a tight closure of the flow opening.

The valve element preferably has a valve spring receptacle or is fastened thereto by partial encapsulation of the valve spring. The

Valve spring receptacle of the valve element allows insertion of a

Area, in particular of the valve element receiving portion in the

Valve element, whereby the valve element and the valve spring are positively held, in particular both axially and radially, to each other. Alternatively, the valve spring in the production of the check valve from the material of the valve element at least partially, in particular on the

Overmolded valve element receiving portion, whereby the valve element is held securely and permanently on the valve spring.

In the following, the invention will be explained in more detail with reference to the drawing. Show this

1 shows a check valve in a perspective view,

2 shows the check valve in a longitudinal sectional view,

Figure 3 shows a check valve cover in a perspective

Presentation,

FIGS. 4A to 4D show different embodiments of the valve spring of FIG

Check valve and

Figure 5 shows an embodiment of the valve spring with a valve element arranged thereon.

Figure 1 shows a perspective view of a check valve 1 of a fluid pump, not shown here, as they are particularly in

Motor vehicles is used. The check valve 1 comprises a housing 2, which is formed in two parts, wherein a first housing part 3 a Connecting piece of the fluid pump and the second housing part 4 forms a coatable on the connecting piece lid.

Figure 2 shows the check valve 1 in a longitudinal sectional view. It can be seen that the first housing part 3 is formed hollow inside to a

Fluid channel 5 in particular for the coming of the pump fluid. While the lateral surface of the housing part 3 is formed closed, the end face 6 of the first housing part 3 has a throughflow opening 7. The throughflow opening 7 connects the fluid channel 5 with a formed between the cover 4 and the end face 6 of the first housing part 3

Fluid channel 8.

The flow-through opening 7 has on the side facing the second housing part 4 a sealing seat 9, against which a valve member 10 is pressed to close the flow opening 7 by means of a biasing force. The valve element 10 is formed substantially hemispherical, wherein the spherical shape having the side of the valve element 10 of the flow opening 7 faces, so that the spherical

Outer surface of the valve member 10 sealingly cooperates with the correspondingly shaped sealing seat 9 of the flow opening 7.

The biasing force pressing the valve element 10 against the sealing seat 9 is applied by a valve spring 11. As best seen in Figure 1, the valve spring 1 1 is formed by a round wire which is wound in a plane such that it is kidney-shaped in the plane, with its two free ends are arranged flush with each other or opposite each other. The valve spring 1 1 or the plane in which the round wire is wound is perpendicular to the direction in which the valve element 10 is displaceable against the biasing force, as indicated by an arrow 12 in Figure 2. The valve spring 1 1 has a

Valve element receiving portion 13, which is formed by the kidney-shaped formation or winding of the round wire. The valve element 10 and the valve spring 1 1 are designed such that the valve element receiving portion 13 receives the valve element at least partially. In the present case, the valve element 10 has on its the

Throughflow opening 7 facing away from a frustoconical projection 14, the diameter of which decreases starting from the valve element in the direction of the valve spring 1 1. Preferably, the height of the projection 14 corresponds to at least the cross-sectional diameter of the round wire 1 1. The valve element receiving portion 13 is formed substantially annular and is arranged centrally to the valve spring 1 1. The Ventilelement- receiving portion 13 and the projection 14 of the valve member 10 are formed such that the circumference of the projection 14 at its foot corresponds at least substantially to the inner diameter of the Ventilelement- receiving portion 13, so that when the projection 14 completely into through the valve element Receiving section 13 formed receptacle 15 is introduced, it is at least radially positively held by the valve element receiving portion 13. Due to the conical design of the projection 14 of the projection 14 acts centering when inserted into the

Valve element receiving portion 13 and into the receptacle 15, whereby the assembly is facilitated. The valve element 10 can be inserted so far into the receptacle 15 until either the circumference of the projection 14 corresponds to the inner diameter of the receptacle 15 or until the valve member 10 abuts with its substantially flat back against the valve spring 1 1.

As further best Figure 2 can be removed, the second housing part 4 on its end face 6 facing the underside of a substantially annular receptacle 16, which is formed like a groove. In the receptacle 16, the spring element 1 1 with its outer holding portion 17, which corresponds essentially to a half circular ring, preferably held positively and / or non-positively. In the region in which the holding section 17 merges into the valve element receiving section 13, the valve spring 11 or the round wire rests on the outside of the end face 6 and / or on the rear side of the valve element 10. The fluid channel 8 is formed so high or deep, that the valve element receiving portion 13 in the direction of arrow 12 is elastically deformable freely oscillated.

In operation, the valve spring 11 urges the valve element 10 into the sealing seat 9, as described above. However, it exceeds the pressure in the direction of the arrow 12 caused by the pressure in the fluid channel 5 on the valve element 10 Force the biasing force, the valve element 10 is displaced in the direction of the arrow, whereby the valve spring 1 1 and in particular the valve element receiving portion 13 is elastically deformed. By the form-fitting

Receiving the valve element 10 in the valve element receiving portion 13, the valve element 10 is guided by the valve spring while it is displaced. Preferably, the second housing part 14 has a stop, not shown here, up to which the valve element receiving portion 13 and the valve element 10 is displaced to prevent overstretching of the valve spring 1 1. As a result, the functionality of the

Valve spring or the check valve 1 permanently guaranteed. The stop is preferably from the inside of the fluid channel 8

or of the second housing part 4. If the pressure in the fluid channel decreases again, the valve element 10 is pushed back in the direction of the sealing seat 9 in order to seal it in a sealed manner.

Due to the advantageous design of the valve spring 1 1 by the wound in the plane round wire is claimed in the axial direction, ie in the direction of the arrow 12, little space and yet the valve function permanently guaranteed.

FIG. 3 shows a perspective bottom view of the second housing part 4 of the check valve 1. The fluid channel 8 is formed by a recess 18, which is formed substantially cylindrical. Furthermore, the second housing part 4 has a recess 19, which leads from the recess 18 radially outward to the connection not shown here. Thus, the fluid flowing through the throughflow opening 7 of the first housing part 3 can flow out through the recess 18 and the recess 19.

FIGS. 4A to 4D show different embodiments of the valve spring 1 1. FIG. 4C shows the valve spring 1 1, as it also in the

Embodiment according to Figures 1 and 2 is provided. Figure 4A shows the valve spring 1 1 in a double kidney-shaped embodiment, in which two inner valve element receiving portions 13 are provided. Preferably, the valve element has corresponding projections, which cooperate with one of the valve element receiving portions 13. This will be a Relocating the valve element secured such that a tilting of the

Valve element is prevented during displacement.

FIG. 4B shows a similar, double kidney-shaped embodiment of the valve spring 11, which differs from the embodiment according to FIG. 4A

differs in that the free ends of the round wire are not directly facing each other or aligned with each other, but inwardly bent away from each other away in the plane of the valve spring 1 1 lie. Preferably, the cover or the second housing part 4 is formed according to the valve spring according to the embodiments of Figures 4A and 4B such that both valve element receiving portions 13 are elastically deformable to allow a displacement of the valve element 10. Of course, each valve element receiving portion 13 may each be assigned a single valve element, each one

Flow opening of the first housing part 3 closes or releases.

Figure 4D shows an embodiment of the valve element 1 1 in a schematic representation, in which the round wire is wound in a plane such that its two ends are arranged facing away from each other and between the two ends of the round wire corrugated. In the present case, the valve element 1 1 also has a valve element receiving section 13, which is formed by one of the shafts. Figure 5 shows an embodiment of the valve spring 1 1 with the valve element 10 arranged thereon. In this embodiment, the valve spring 1 1 in the plane is spirally wound, wherein at least the outer winding a holding portion 17 and the inner winding the

Valve element receiving portion 13 forms. In the present

Embodiment, the valve element 10 on the outer surface of the shell

Projection 14 a groove-like recess 19, in which the inner winding of the valve spring 1 1 at least partially, preferably positively and / or non-positively introduced. As a result, the valve element 10 is attached to the valve spring 1 1, whereby both elements together

Form pre-assembly, thereby simplifying the assembly and the

Durability of the check valve 1 is further increased. In an alternative embodiment, the valve element 10 is around the

Valve element receiving portion 13 at least partially injected around, whereby a particularly firm connection between the valve spring 1 1 and the valve element 10 is ensured. The housing part 4 can with the

Housing part 3 caulked, pressed, screwed or on another the

Connected specialist known manner. Here is the

Valve spring 1 1 held clamped at least with its holding portion 17 between the second housing part 4 and the first housing part 3, so that in particular a biasing force is applied to the valve element 10, at least when the back of the voltage applied to the sealing seat 9

Valve element 10, the end face 6 projects beyond.

Claims

claims

1 . Check valve (1) for a fluid pump, in particular one

Safety brake system of a motor vehicle, with a through a

Valve element (10) closable throughflow opening (7), wherein the valve element (10) against the spring force of a valve spring (1 1) of wound round wire for releasing the flow opening is displaceable, characterized in that the round wire wound in a plane and so to the valve element (10) is arranged such that the plane is at least substantially perpendicular to the

Displacement direction of the valve element (10) extends.

Second check valve according to claim 1, characterized in that the round wire in the plane at least substantially kidney-shaped, Doppelnierenförmig, wavy or spirally wound.

3. Check valve according to one of the preceding claims, characterized in that the round wire is wound in the plane such that it has at least one valve element receiving portion (13).

4. Check valve according to one of the preceding claims, characterized in that the valve element receiving portion (13) and / or the valve element (10) are formed such that the valve element receiving portion (13) the valve element (10) partially, in particular positively receives ,

5. Check valve according to one of the preceding claims, characterized in that the valve element receiving portion (13) is arranged at least substantially centrally.

6. Check valve according to one of the preceding claims, characterized in that the round wire between two housing parts (3,4) of the check valve (1) is held, wherein at least the valve element receiving portion (13) is freely swinging displaced.

7. Check valve according to one of the preceding claims, characterized in that at least one of the housing parts (4) receives the round wire partially, in particular form-fitting manner.

8. Check valve according to one of the preceding claims, characterized in that at least one of the housing parts (3,4) has a maximum deformation of the valve spring (1 1) limiting stop.

9. Check valve according to one of the preceding claims, characterized in that the valve spring (1 1) is held biased.

10. Check valve according to one of the preceding claims, characterized in that the valve element (10) has a valve spring receptacle (19), or is secured by partial encapsulation of the valve spring to this.