EP2726349A1

EP2726349A1 - Magnetic valve

Info

Publication number: EP2726349A1
Application number: EP12722696.7A
Authority: EP
Inventors: Andreas Karl; Reinhard Fink; Dirk Foerch
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2011-06-29
Filing date: 2012-05-08
Publication date: 2014-05-07
Also published as: WO2013000612A1; KR20140035452A; CN103648866A; JP2014523506A; DE102011078314A1; US20140110614A1; US10047874B2; CN103648866B; JP5982476B2

Abstract

The invention relates to a magnetic valve (1) comprising a valve component (26) and a valve body (10) that engages around a region of the valve component (26) in a hood-like manner and in a sealing manner in at least one sealing region (31). A flow chamber (27) is formed between the valve body (10) and an end face (28) of the valve component (26). In order to form an axial duct (15) for a fluid, the valve component (26) has an axially running through-channel (29) which passes through the end face (28) and which opens into the flow chamber (27), and the valve body (10) has a through-opening (11) that is fluidically connected to the flow chamber (27). The through-opening (11) can be closed by a closing element (6) that is movably arranged on a valve body (10) face that faces away from the flow chamber (27). The through-channel (29) has a constant cross-section. According to an advantageous development of the invention, the end face (28) is designed as a type of lip seal ring (30).

Description

description

title

Solenoid valve The invention relates to a solenoid valve having a valve component and a valve body, which covers a region of the valve component and sealingly surrounds at least one sealing region, wherein between the valve body and the valve body

Valve body and a front side of the valve member, a flow space is formed and for forming an axial passage for a fluid, the valve member has an axially extending, the front side and opening into the flow space through passage and the valve body fluidly connected to the flow space passage opening, wherein the passage opening through a closing element arranged to be displaceable on a side of the valve body facing away from the flow space can be closed.

State of the art

Solenoid valves of the type mentioned are known from the prior art. These are used for example in anti-lock braking systems (ABS) and / or electric stabilization programs (ESP) of motor vehicles. Such a solenoid valve is used to set a volume flow of a fluid, in particular a brake fluid. A passage of the solenoid valve forms an inlet or outlet for the fluid for this purpose. The passage is formed by a valve member and a valve member surrounding the hood-like valve body. For this purpose, the valve component has a passage which is inserted into one of the valve component and the

Valve body limited flow chamber opens. To provide a good sealing effect of the passage, i. between the valve member and the valve body, the cross-section of the passageway is in the region of its

Mouth in the flow space increased by a step education, so that the valve member forms a relatively thin-walled channel wall in this area. Fluid, which flows under high pressure through the passage, in particular the passage channel, exerts a force on the

Valve component off. Due to the thin design of the channel wall, this is against the valve member in the region of the channel wall encompassing

Valve body pressed. Thereby, a good sealing effect between the valve member and the valve body is achieved and prevents possible leakage of the passage of the solenoid valve. Due to the cross-sectional geometry of the passage may lead to an undesirable flow behavior of the fluid and cyclic stalls. This leads, in particular at high fluid flows of the solenoid valve, to a noise which has an unwanted, tonal component that is sometimes perceived as disturbing during operation. Disclosure of the invention

In a solenoid valve of the type mentioned above, the invention provides that the passage channel has a constant cross-section. The passage is formed by the through passage formed in the valve member, the axially adjoining flow space, which is enclosed by the valve member and the valve body, and the passage opening. The fluid is guided in succession through the passageway, the flow space and the flow opening in the flow direction. Due to the constant over its length cross-section of the passage channel is a uniform flow behavior in the passageway before. So it does not come to the aforementioned stall that lead to the unwanted noise noise, as is the case with the known solenoid valves due to the one-stage passageway. Because of the constant

Cross-section of the passage, the area of the passage, in which he may have a different cross-section, limited to the

Flow space, ie, the area of the passage formed between the mouth of the passage channel in the flow space and the preferably formed in the axial extension of the passage channel. As a result, and in particular by the possible due to the invention, small distance between the mouth and the passage opening shifts the tonal component of a possible noise due to Flow behavior in the passage in a non-human hearing impaired range over 12 kHz. Preferably, the distance between the mouth and the passage opening is less than the largest dimension in the cross section or the diameter of the passage channel. The cross section of the passage channel is preferably circular. The "constant" cross section of the passage channel is also understood to mean cross-sectional dimensions which have small deviations from the constant cross-sectional dimension, for example due to manufacturing tolerances.

In the flow direction in front of the passageway, a channel inlet may be provided with substantially any cross-section. The cross section may change in the flow direction. For example, the channel inlet is in the form of a diffuser whose cross-section decreases in the direction of flow. In

Viewed flow direction, the longitudinal extent of the channel inlet is less than that of the passage channel, so that the described, uniform flow behavior is achieved. In particular, the longitudinal extent of the channel inlet is a maximum of 20%, preferably 10%, of the longitudinal extension of the passage channel or at most the largest dimension in the cross section or the diameter of the passage channel. The mouth of the passage channel is located at the downstream most upstream position of the valve member.

According to a development of the invention, it is provided that the

Valve component has a radially spaced from the passageway arranged, acting on the sealing area sealing device. The sealing device realizes a good sealing effect in the sealing area between the valve component and the valve body and thus ensures a leak-free passage formed. Due to the constant over its length cross section of the

Passage channel, the sealing device is formed at a radial distance to this. Passage channel and sealing device are thus spatially separated. The sealing device is preferably formed integrally with the valve component.

A development of the invention provides that the sealing device as at least one deformable by pressure of the fluid material zone of the

Valve component is formed. Due to the deformability of the material zone an increased sealing effect is achieved in the sealing area. Due to the fluid flowing under high pressure through the passage, this exerts a force on the material zone which causes it to deform, in particular plastic or elastic deformation. Preferably, the material zone is designed to be so thin that the rigidity of the material is reduced in this area.

Preferably, the valve member and insofar the material zone is formed of plastic. Advantageously, the material zone is limited

partially the flow space, so by the pressure of the

Flow space fluid is deformed the material zone.

It is preferably provided that the sealing region formed by the valve component and the valve body from an outer region of the

Material zone and an inner region of the valve body is formed. Since the valve body surrounds the valve member in regions, are the

Outside of the material zone and the inner region of the valve body to each other and thereby seal the passage of the solenoid valve leak-free. Due to the preferred deformability of the material zone, this is pressed by the pressure of the fluid against the valve member, in particular the material zone, embracing valve body, in particular its inner region. This preferably takes place essentially in the radial direction.

As a result, an increased sealing effect of the sealing area is achieved.

It is advantageous if the material zone is formed as an outer web, in particular outer annular web, of the valve component. The outer web extends so far on the circumference of the valve member. Through the education of

Material zone as outer web is formed a relatively thin-walled material zone, which is preferably deformable by the pressure of the fluid. The height of the outer web preferably extends in the axial direction. The outer web may be a continuous annular web, in particular circular annular web, or as a discontinuous or non-continuous web, the plurality of

Has web portions, be formed. In the present application, "web" is to be understood as a three-dimensional, geometric body whose length dimension is greater than its width dimension, and in particular height dimension.

In an advantageous development of the invention, it is provided that an axial zone which delimits the material zone and opens into the flow space, in particular groove, is formed on the end face of the valve member. If the passage through which the fluid flows, fluid is also in the depression. Due to the pressure of the fluid, the recess is widened radially outwards and the material zone is deformed accordingly, in particular it is deformed in the radial direction. This results in the mentioned, good sealing effect of the sealing area. Through the axial recess, the material zone

preferably formed in the form of the outer web. In a preferred embodiment, the recess may be formed by a plurality of, mutually in

Circumferentially spaced recessed portions may be formed.

In an advantageous development of the invention it is provided that the recess is designed as a, around the passageway with radial distance to this extending, annular, in particular annular, recess. The annular recess is circumferentially completely surrounding the passageway and continuously formed, wherein the recess is always spaced from the passageway. Furthermore, it is provided in a preferred embodiment that is provided by the annular recess, the relatively thin-walled material zone along the entire circumference of the valve member. Preferably, the radial distance of the recess to the sealing area over the entire circumference of the valve member is constant to a same height

To realize sealing effect at any point of the sealing area.

Furthermore, it is advantageous if the valve component has a formed between the passageway and the recess inner web, in particular inner ring land. The inner web can be interrupted, i. several

Having web sections, be formed and thus limits the

Passage passage along its circumference in the region of its mouth in the flow space sections. The inner ring land is formed continuously and limits the said area completely.

According to a further embodiment of the invention, it is provided that the valve component - viewed radially from the inside outwards - the

Passage channel, the inner web, the recess and the outer web has one behind the other. It is preferably provided that - viewed in the axial direction - the heights of the inner web and the outer web are the same size. In a preferred embodiment of the valve component, the end faces of the inner and outer web lie in a plane which is perpendicular to the axial direction.

As a result, the inner and outer webs have the same height, i.

in particular in the flow direction the same extent, on.

Due to manufacturing reasons, the heights may also differ slightly.

Furthermore, it is advantageous if the valve component is arranged in the valve body partially pressed. By this pressed arrangement is already a certain seal between the valve body and the

Valve device achieved. In addition, this allows a simple, mechanical installation.

It is also advantageous if the valve body consists of deep-drawn or turned steel.

The drawings illustrate the invention with reference to various embodiments, in which:

1 shows a schematic longitudinal sectional view of a solenoid valve according to a first embodiment,

Figure 2 is a schematic longitudinal sectional view of a portion of the

Solenoid valve according to Figure 1, and

Figure 3 is a schematic longitudinal sectional view of a portion of a

Solenoid valve according to a second embodiment.

1 shows a schematic longitudinal sectional view of a solenoid valve 1 according to a first embodiment. The solenoid valve 1 has a sleeve 2, in which a piston-like armature 3 along a longitudinal axis 4 of the solenoid valve 1 is arranged to be movable. A designed as a ram 5 closing element 6 is operatively connected at one end 7 with the armature 3. The armature 3 opposite, free end 8 of the closing element 6 is formed as a sealing geometry 9, the dome shaped is. The sealing geometry 9 acts in a closed position of the solenoid valve 1 with a formed in a valve body 10, a passage opening 1 1 having funnel-shaped valve seat 12 together. The solenoid valve 1 further comprises a substantially hollow cylindrical valve insert 13, which is encompassed by the sleeve 2 partially. Through the sleeve 2, the

Valve insert 13 and the valve body 10, which is arranged in regions in the valve core 13, a valve chamber 14 is limited for a fluid. The valve chamber 14 is fluidly connected to a passage 15 which is formed as an inlet 16 for the fluid and through the passage opening 1 1 of the

Valve body 10 is formed with. The passage 15 extends in the axial

Direction along the longitudinal axis 4 of the solenoid valve 1. Hereinafter, the passage 15 is discussed in more detail.

The valve chamber 14 is further fluidically connected to at least one, but usually more radial channels 17, wherein in the

Sectional view of Figure 1, two such radial channels 17 can be seen. The radial channels 17 form an outlet 18 for the fluid and are formed perpendicular to the longitudinal axis 4 in the valve core 13. In the valve chamber 14, a spring support 19 is further arranged, which is pressed into the valve core 13 and surrounds the closing element 6 at least partially annular. One

Spring element 20 is supported on one side on the spring seat 19 and on the other side on a shoulder 21 of the closing element 6. The solenoid valve 1 also has a bypass channel 22, which connects the valve chamber 14 and the passage 15 fluidly. In the bypass passage 22, a check valve 23 is provided, which comprises a spherical check valve closing body 24 and a check valve seat 25.

If, during operation of the solenoid valve 1, a magnetic coil surrounding the sleeve 2 in the region of the magnet armature 3, not shown in FIG. 1, is energized, the magnet armature 3 and the closing element 6 move along the magnet armature 3

Longitudinal axis 4 against a restoring force of the spring element 20 in the direction of the valve seat 12. As a result, the sealing geometry 9 is pressed into the valve seat 12 and the connection between the passage 15 and the valve chamber 14 is closed. The bypass passage 22 is closed by the check valve 23, since the non-return valve closing body 24 by the pressure acting thereon of the fluid in the passage 15 in the check valve seat 25th is pressed. The fluid located in the passage 15 can not flow into the valve chamber 14 of the solenoid valve 1 in this respect. The solenoid valve 1 is thus in a closed position. If the magnetic coil is not energized, then the sealing geometry 9 is in a position lifted off from the valve seat 12, since the spring element 20 supported on the spring support 19 is the

Closing element 6 and the armature 3 along the longitudinal axis 4 pushes upwards. Thus, the fluid flows through the passage 15 in the valve chamber 14 and leaves it through the radial channels 17. The solenoid valve 1 is so far in an open position. In particular, it is in the

Solenoid valve 1 to a normally open solenoid valve 1. Depending on the strength of the

Energization of the solenoid coil and a partial opening of the passage 15 is possible. With a flow of the fluid opposite to the above

described flow direction, the check valve 23 is opened by the pressure of the fluid in the valve chamber 14, i. the check valve closing body 24 is lifted from the check valve seat 25, so that fluid flows from the valve chamber 14 through the bypass passage 22 in the passage 15.

In FIG. 2, the area of the solenoid valve 1 marked in FIG. 1 is shown enlarged. The same reference numerals denote the same components of the solenoid valve 1, so far as to the associated

Description text is referenced. In the figure 2, the valve body 10 can be seen, which is preferably formed from deep-drawn steel and / or sleeve-like. The valve seat 12 is formed on the valve chamber 14 facing side of the valve body 10. The valve body 10 surrounds at least partially a valve component 26, which is preferably made of plastic. Preferably, the valve member 26 is partially pressed into the valve body 10. Through the valve member 26 and the

Valve body 10, a flow space 27 is limited, in particular, this is between an end face 28 of the valve member 26 and the valve body 10 before. In this case, the end face 28 is flat and preferably formed perpendicular to the longitudinal axis 4. The valve component 26 has a passageway 29 extending along the longitudinal axis 4 with a cross section that remains constant over its length, in particular a circular cross section. The passage 29 opens the end face 28 by cross into the flow space 27 a. in the

Valve component 26 is also a channel inlet 29 'is formed. Of the

Channel inlet 29 'closes axially to the flow space 27 facing away from the end of the passageway 29 at. The channel inlet 29 'preferably also has a circular cross-section. Starting with the transition of the

Passage channel 29 into the channel inlet 29 ', at whose cross sections are identical, the cross section of the channel inlet 29' is continuously larger. The channel inlet 29 'forms a diffuser insofar. The channel inlet 29 'is shorter in the axial direction, preferably shorter by a multiple than that

Passage passage 29 is formed. The channel inlet 29 ', the passage channel 29, the flow space 27 and the passage opening 1 1, which - viewed in the axial direction upwards - are substantially one behind the other, form the opening into the valve chamber 14 Durchläse 15 of the solenoid valve. 1 This is the

Passage opening 1 1, which has a smaller cross-section than the passageway 29, coaxial with the passageway 29 before. The bypass passage 22 and the check valve seat 25 are formed in the valve member 26. The valve component 26 has a sealing device 30. This is integral with the valve member 26, i. from the material of the valve member 26 is formed. The sealing device 30 acts sealingly on a sealing region 31, which seals the passage 15 of the solenoid valve 1 without leakage and is formed by the valve component 26 and the valve body 10. The

Sealing device 30 is formed by a present on the end face 28 of the valve member 26, axial, opening into the flow chamber 27 recess 32. The recess 32 surrounds the passage channel 29 annular and is spaced therefrom in the radial direction. The radially outwardly of the recess 32 lying region of the valve member 26 forms a

Material zone 33, which is formed as an outer web 34, in particular outer annular web 35, of the valve member 26. The lying between the passageway 29 and the recess 32 portion of the valve member 26 forms an inner web 36, in particular inner ring land 37, the valve member 26. The outer ring land 35 and the inner ring land 37 have the same height in the axial direction, their faces flush accordingly in the radial direction with each other. The inner annular ridge 37 has a rectangular shape in a substantially rectangular shape. The outer ring land 35 has a trapezoidal longitudinal section substantially, wherein its radial width decreases in the direction of the passage opening 1 1. This means that the outer annular ridge 35 is formed thinnest in the region of the end face 28 of the valve member 26, that is, has a minimum width. The outer ring land 35 represents the Sealing device 30. The sealing region 31 formed between the valve component 26 and the valve body 10 is formed by an outer region 38 of the material zone 33 and an inner region 39 of the valve body 10.

In FIG. 3, a region of a solenoid valve 1 is according to a second one

Embodiment shown. The same reference numerals designate the same components, so that reference is made to the above statements. The solenoid valve 1 shown with reference to Figure 3 corresponds to that shown in Figure 2, but no sealing device 30 and thus no

Recess 32 are provided in the valve member 26.

This results in the following function of the solenoid valve 1: The fluid which in the open state of the solenoid valve 1 through the aperture 15 in the

Valve chamber 14 flows, characterized by a uniform flow behavior in the passageway 29. This is due to its constant cross-section along its entire axial length, whereby an at least partially formed flow profile is established until reaching the mouth of the passage 29. This does not lead to disadvantageous

Flow effects or stalling that can produce unwanted noise effects. Owing to the provision of the channel inlet 29 ', which is formed axially in front of the passage channel 29, with a cross-section which narrows in the direction of flow, undesired flow effects are already minimized when the fluid enters the passageway 29. Between the mouth of the passage 29 in the flow space 27 and the latter

opposite passage opening 1 1, i. in the flow space 27, the passage 15 has a larger and changing cross-section. If there are deviations from this in this area of the passage 15

uniform flow behavior occurs, for example, due

Different speeds of the fluid located in the flow space 27 and the fluid passing from the passageway 29 into the flow space 27, only a high-frequency, not disturbing to human hearing noise is generated because the axial extent of this area, ie

Flow space 27, is short, in particular shorter than the largest dimension in the cross section or the diameter of the passage channel 29th In addition, according to the first embodiment of Figures 1 and 2, a well-sealed passage 15 is realized. The fluid flowing through the passage 15 also enters the recess 32 opening into the flow space 27 and thus exerts a force, in particular with a radial component, on the web 34. This will be radially outward against the

Valve member 26 embracing valve body 10 pressed, whereby the leak-free guidance of the fluid through the passage 15 is ensured. Due to the trapezoidal longitudinal section of the web 34 this is in the field of

Face 28 of the valve member 26 formed thinnest, so it comes in this area for best sealing effect, because the material of the web 34 of the fluid caused by radially outwardly acting force opposes a correspondingly low elasticity. By

Formation of the recess 32 and consequently of the sealing device 30, the construction is further insensitive to manufacturing tolerances with respect to the sealing effect. In the absence of recess 32 according to the embodiment of Figure 3 higher assembly forces for pressing the valve member 26 in the valve body 10 are required for given manufacturing tolerances, since the valve member 26 is more rigid than that with existing recess 32nd

Claims

claims

1 . Solenoid valve (1) with a valve member (26) and a portion of the valve member (26) hood-like and in at least one

Sealing region (31) sealingly encompassing the valve body (10), wherein between the valve body (10) and an end face (28) of the valve member (26) a flow space (27) is formed and for forming an axial passage (15) for a fluid valve member (26) an axially extending, the end face (28) and through into the flow space (27) opening out passage (29) and the valve body (10) with the flow space (27) fluidically connected passage opening

(1 1), whereby the passage opening (1 1) can be closed by a closing element (6) displaceably arranged on a side of the valve body (10) facing away from the flow space (27)

characterized in that the passageway (29) has a constant

Cross section has.

2. Solenoid valve according to claim 1, characterized in that the

Valve component (26) has a sealing device (30) arranged radially spaced from the passage channel (29) and acting on the sealing region (31).

3. Solenoid valve according to one of the preceding claims, characterized

in that the sealing device (30) is designed as at least one material zone (33) of the valve component (26) that can be deformed by pressure of the fluid.

4. Solenoid valve according to one of the preceding claims, characterized

in that the sealing region (31) formed by the valve component (26) and the valve body (10) is formed by an outer region (38) of the material zone (33) and an inner region (39) of the valve body (10). Solenoid valve according to one of the preceding claims, characterized

in that the material zone (33) is designed as an outer web (34), in particular an outer annular web (35), of the valve component (26).

Solenoid valve according to one of the preceding claims, characterized

characterized in that a the material zone (33) limiting, axial, in the flow space (27) opening recess (32), in particular groove, on the end face (28) of the valve member (26) is formed.

Solenoid valve according to one of the preceding claims, characterized

in that the recess (32) is formed as a, around the passageway (29) with radial distance to this extending, annular, in particular annular, recess (32).

Solenoid valve according to one of the preceding claims, characterized

in that the valve component (26) has an inner web (36), in particular inner annular web (37), formed between the passage channel (29) and the depression (32).

Solenoid valve according to one of the preceding claims, characterized

characterized in that the valve member (26) - viewed radially from the inside outwards - the passageway (29), the inner web (36), the recess (32) and the outer web (34) one behind the other.

0. Solenoid valve according to one of the preceding claims, characterized

characterized in that - viewed in the axial direction - the heights of the inner web (36) and the outer web (34) are equal.