DE102010047495A1 - Body for proportional 3/2 electromagnetic valve, has closing element forming seat valves together with valve seats for closing inlet sided axial bore hole and outlet sided axial bore hole, respectively - Google Patents

Abstract

The body has a valve chamber (3) provided in a region of an axial bore hole (2). A radial bore hole (34) connects the chamber with a consumer terminal i.e. A-terminal. A valve seat is designed in the chamber on an inlet side. Another valve seat (35) is provided in the chamber on an outlet side. A closing element (40) i.e. ball, forms seat valves together with the valve seats for closing the inlet sided axial bore hole and the outlet-sided axial bore hole, respectively. The axial bore hole connects an inlet i.e. P-terminal, of a pressure source terminal with an outlet i.e. T-terminal. An independent claim is also included for an electromagnetic valve comprising an electrically controllable magnetic coil.

Description

The invention relates to a valve body for a proportional 3/2-way solenoid valve according to the main application DE 10 2010 ... and a valve equipped with the valve body according to the invention solenoid valve.

Such a 3/2-way solenoid valve with two seat valves is from the EP 1 004 066 B1 known. A first seat valve is formed in a conventional manner by a valve seat arranged in an axial bore of the valve body together with a spherical closing element. With this seat valve, a connected to a pressure generator inlet is closed with a de-energized solenoid valve against a radially connected to the axial bore consumer channel. When energizing the solenoid of the solenoid valve, the spherical closing element of the first seat valve is lifted and thus made a connection to the consumer connection. At the same time increasingly the second seat valve is closed, whereby the return current is throttled in response to the coil current to build up the required pressure characteristics.

In this known 3/2 solenoid valve with two seat valves, however, it is difficult to realize predetermined pressure characteristics at the consumer connection, in particular, this requires a complex structure. Furthermore, such known valves for adjusting the pressure characteristics have to be adjusted consuming and suffer from a lack of robustness in terms of their function, especially with respect to temperature influences.

The invention has for its object to provide a valve body and an associated 3/2-solenoid valve of the type mentioned, with such a valve body or with the associated 3/2-solenoid valve in a simple design predetermined pressure characteristics can be realized without additional adjustment measures are required.

This object is achieved by a valve body having the features of patent claim 1 and by a solenoid valve having the features of patent claim 8.

A valve body according to the invention is characterized in that the radial bore connecting the valve space of the valve body to the load port is profiled in the axial direction in such a way that the geometric outflow surface increases monotonously as a function of the lifting movement arising from the first valve seat releasing the radial bore , constant or monotonically decreasing values or a combination of partially monotonically increasing and / or constant and / or monotonically decreasing values.

This makes it possible to realize any predetermined pressure characteristic at the load connection of the valve body or of the valve body having such a solenoid valve by a freely selectable Ausflussgeometrie the radial bore. By such a variable contour of the cross section of the radial bore, this predetermined pressure characteristic can be selectively controlled depending on the stroke of the closing body. Depending on the stroke, in comparison to the prior art, in which only geometric outflow contours of simple geometric shape, such as circles are used, outflow surfaces can be realized with increasing, constant, decreasing values or in combination thereof, which arise from the fact that when lifting the closing element, the radial bore is increasingly released.

In one embodiment of the invention, the radial bore is profiled in cross-section as a triangular shape, wherein the tip of the triangular shape is arranged valve seat side. As a result, a pressure characteristic is realized at the consumer connection, which has a convex profile.

According to another embodiment of the invention, the cross section of the radial bore may have a free form, preferably profiled as a T-shape, wherein the T-shape with respect to the axial direction with a transverse transverse slot and a longitudinal longitudinal slot formed and the transverse slot is arranged valve seat side. It is particularly advantageous to choose the slot width of the transverse slot greater than the slot width of the longitudinal slot. Thus, it is possible that the value of the outflow surface initially increases monotonically, as long as the transverse slot of the T-shape is released from the closing element, and then in the region of the narrower longitudinal slot in a nearly constant value.

In a further embodiment of the invention, the radial bore is profiled in cross-section as an ellipse, wherein preferably the longitudinal axis of the ellipse extends in the axial direction.

According to a further development of the invention, it is particularly advantageous with a freely selectable outflow geometry in which the radial bore is designed as a regular or irregular polygon in cross section, to realize any desired, in particular atypical outflow surface in order to produce a predetermined pressure characteristic as a function of the stroke of the closure element to control at the consumer output.

The solenoid valve according to the invention comprises a valve body according to the invention, further comprising a longitudinally movably guided armature, an electrically controllable magnetic coil for moving the armature, and a valve tappet movable by the armature, which can be brought into operative connection with the closing element of the valve body.

The solenoid valve according to the invention is characterized in that the valve chamber, d. H. the cavity in the interior of the solenoid valve, the closing element and the connections can be dimensioned such that a constant flow force acts on the closing element. Such a design can be achieved, for example, by numerical methods.

The invention will now be described in detail by means of embodiments with reference to the accompanying figures. Show it:

1 3 is a perspective sectional view of a solenoid valve with a valve body according to the invention according to an embodiment of the invention,

2 an exploded view of the valve body according to the invention 1 .

3 3 a perspective sectional view of a solenoid valve with a valve body according to the invention according to a further embodiment of the invention,

4 an exploded view of the valve body according to the invention 3 .

5 a perspective view of a second valve body part of a valve body according to 4 with an alternative cross-sectional shape of the radial bore,

6 schematic partial representations of valve bodies according to the invention with a triangular or a T-shaped radial bore,

7 1 is a partial sectional view of a solenoid valve in the region of a valve body according to the invention,

8th a stroke-pressure diagram of a solenoid valve with a valve body according to the invention according to 6a , and

9 a stroke-pressure diagram of a solenoid valve with a valve body according to the invention according to 6b ,

The in the 1 and 3 illustrated 3/2 proportional solenoid valves 1 are identical, so that in the following description thereof refer to both figures. The difference between these two 3/2 proportional solenoid valves 1 lies in different versions of the associated valve body 10 , each in detail in connection with the 2 . 4 and 5 to be discribed.

In the figures, identical elements or parts having identical functions are given the same reference numerals.

The solenoid valve 1 includes for receiving its components a valve housing 8th with an axial bore 9 , which is formed in sections with different diameters.

At one end of this valve housing 8th , which forms a pressure port P, begins the axial bore 9 with a bore section 9a for receiving a valve body according to the invention 10 is formed with a diameter adapted to its peripheral surface. Under formation of a shoulder on which the valve body 10 is present, a bore section closes 9b with a smaller diameter, wherein the space thus formed via four, two diametrically opposite radial bores 5 in the valve housing 8th with a tank connection as drain T is in communication.

The axial bore 9 of the valve housing 8th puts with a bore section 9c away, which is a bearing bush 70 for the storage of a valve lifter 7 receives. Subsequently, the axial bore widens 9 in a bore section 9d on, one with the valve lifter 7 firmly connected and movable anchors 50 receives. The valve housing 8th becomes on this side of a Polkern 90 closed, the axial bore 9 with a bore section 9e concludes. This bore section 9e takes another bushing 80 on, with the for the valve lifter 7 a second storage is available. A sleeve 81 forms the housing termination.

Furthermore, the valve housing 8th in the area of the anchor 50 a same torus-shaped circumferential receiving space for receiving one on a spool core 6a wound magnetic coil 6 ,

To the valve lifter 7 to keep in the de-energized state, located between the opposite faces of the anchor 50 and the polkernel 90 a compression spring 60 , This spring is supported 60 on the one hand at the pole core 60 against a Polfäche and on the other hand against the bottom of a blind hole in the anchor 50 from. The Polfäche is surrounded by a circular, conically tapered flange into which the anchor 50 during energization of the solenoid against the spring force of the compression spring 60 dips.

The one in the bore section 9a arranged valve body 10 consists of several parts, which in the exploded drawings according to the 2 and 4 as the first valve body part 20 , as a second valve body part 30 and as a spherical closure element 40 are shown. Im in the valve housing 8th assembled state of the valve body 10 connects an axial bore 2 one inlet (P-connection) 21 on the first valve body part 20 with a drain 31 on the second valve body part 30 passing the bore section 9b with the radial bores 5 in the valve housing 8th with appropriate control of the valve lifter 7 can be connected.

Furthermore, two diametrically opposed transverse bores meet 34 connected to the consumer connection (A port) 5a communicate, the axial bore 2 in a valve room 3 in which the closing element 40 is stored. This closing element 40 forms together with a on the first valve body part 20 trained first valve seat 24 a first seat valve 25 , According to 2 includes the first valve body part 20 a disc-shaped base body 20 at a second valve body part 30 facing end face a disc-shaped shoulder 23 having, which the the axial bore 2 circumferential first valve seat 24 receives.

The second valve body part 30 of the valve body 10 is similarly radially symmetric with a disk-shaped body 32 and a disc-shaped integrally formed shoulder 33 trained, with this shoulder 33 the radial bores 34 receives.

The axial bore 2 in this second valve body part 30 ends in the direction of the first valve body part 20 in a second valve seat 35 that together with the closing element 40 forms a second seat valve when this closing element 40 at this second valve seat 35 is applied.

The opposite ends of the shoulder 23 of the first valve body part 20 and the shoulder 33 of the second valve body part 30 limit the valve space in the axial direction 3 , which is formed substantially cylindrical.

In this valve body 10 serves the closing element 4 together with the first and second valve seats 24 respectively. 35 for forming the first and second seat valves. In the de-energized state of the magnetic coil 6 becomes the first valve seat 24 through the closing element 40 locked. When the solenoid is energized 6 of the solenoid valve 1 becomes the valve lifter 7 by means of the anchor 50 actuated such that the closing element 40 as a function of the coil current, a stroke movement between the first valve seat 24 and the second valve seat 35 performs and depending on its position, so depending on the hub, the radial bores 34 releases more or less and thereby sets a controllable pressure on the consumer port A.

This situation is schematic in 7 represented, after which in the de-energized state of the solenoid valve 1 the closing element 40 the first valve seat 24 closes. This position of the closing element 40 corresponds to a stroke s with s = 0. With increasing current, the stroke s of the closing element also increases 40 up to a maximum value, according to 7 the closing element 40 has reached the dashed line position.

The radial bore 34 the valve body 10 to 2 and 6a has in its axial direction a cross section in the shape of an equilateral triangle, wherein the tip of this triangle adjacent to the first valve seat 24 is arranged. With increasing energization of the solenoid valve 1 takes the stroke of the closing element 40 too, so first the area of the top of the radial bore 34 forming triangle is released and increases in the course of the lifting movement, the value of the outflow monotonically increasing as long until the closing element 40 the radial bore 34 has completely released.

The resulting pressure curve at the consumer connection A is in the sP diagram after 8th shown at a pressure at the P port with 5.5 bar was recorded, the T-port is depressurized. The regulating pressure which occurs at the consumer connection A shows a slightly convex course.

The 3/2 proportional solenoid valves 1 according to 3 in its structure corresponds to the one after 1 but the valve body is facing 10 according to 4 unlike the one after 2 a radial bore 34 on, whose cross-section is a T-shape with a transverse slot 34a and a longitudinal slot 34b forms, wherein the slot width of the transverse slot 34a is much larger than the slot width of the longitudinal slot 34b so that the transverse slot 34a the shape of a rectangle with rounded edges, which is almost square.

The T-shaped radial bore 34 is designed so that its transverse slot 34a adjacent to the first valve seat 24 is so, so that at an incipient energization of the solenoid valve 1 first this transverse slot 34a is released as this particular out 6b is apparent. This results in a progression of the value for the Outflow surface, which initially increases monotonically increasing, but against a triangular radial bore 34 according to 2 with a larger, slightly concave slope. With increasing stroke s of the closing element 40 also becomes the longitudinal slot 34b release, whereby only a small increase in the value of the outflow surface is achieved, which means that the value of the outflow surface remains almost constant.

This course situation of the outflow surface with a T-shaped radial bore 34 is also evident in the course of the control pressure occurring at the consumer connection A, which in 9 is shown. This sP diagram was also recorded at a pressure of 5.5 bar at the P port, with the T port being depressurized. Thereafter, the control pressure increases slightly concave with a steep rise and then goes into a nearly constant value.

The in the 1 to 4 illustrated valve body 10 with a radial bore 34 , which have either a triangular or a T-shaped cross section are shown and explained by way of example. The outflow geometry can be freely selected to realize any given pressure characteristic. Due to the variable contour of the outlet geometry, the corresponding pressure characteristic curve can be selectively controlled as a function of the stroke s.

As another example of a freely selectable outflow geometry shows 5 a second valve body part 30 a valve body 10 in which the radial bore 34 elliptical is formed.

In order to realize atypical outflow geometries, radial bores can be realized with cross-sections that represent combinations of regular or irregular geometric figures, which then lead to value curves of the discharge areas, which correspond to combinations of sections with monotonically increasing, constant or monotone decreasing values.

LIST OF REFERENCE NUMBERS

1

magnetic valve

2

axial bore

3

valve chamber

5

Radial bore as drain T

5a

Radial bore as consumer connection A

6

solenoid

6a

Coil of the magnetic coil 6

7

tappet

8th

valve housing

9

axial bore in the valve body 8th

9a

Bore portion of the axial bore 9

9b

Bore portion of the axial bore 9

9c

Bore portion of the axial bore 9

9d

Bore portion of the axial bore 9

9e

Bore portion of the axial bore 9

10

valve body

20

first valve body part

21

Intake

22

body

23

shoulder

24

first valve seat

25

first seat valve

30

second valve body part

31

procedure

32

body

33

shoulder

34

radial bore

34a

Transverse slot of the T-shaped radial bore 34

34b

Longitudinal slot of the T-shaped radial bore 34

35

second valve seat

40

closing element

50

anchor

60

compression spring

70

bearing bush

80

bearing bush

81

body seat

90

pole core

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1004066 B1 [0002]

Claims (8)

Valve body ( 10 ) for a proportional 3/2 solenoid valve ( 1 ) according to claim 1 of the main application DE 10 2010 ..., characterized in that the valve space ( 3 ) of the valve body ( 10 ) with the consumer connection (A) connecting radial bore ( 34 ) is profiled in cross-section in the axial direction in such a way that in dependence on the lifting of the closing element ( 40 ) from the first valve seat ( 24 ) with release of the radial bore ( 34 ) occurring lifting movement (s) the geometric Ausströmfläche monotonously increasing, constant or monotonically decreasing values or a combination of partially monotonically increasing and / or constant and / or monotonically decreasing values assumes. Valve body ( 10 ) according to claim 1, characterized in that the radial bore ( 34 ) is profiled in cross section as a triangular shape, wherein the tip of the triangular shape is arranged valve seat side. Valve body ( 10 ) according to claim 1, characterized in that the radial bore ( 34 ) is profiled in cross-section as a T-shape, wherein the T-shape with respect to the axial direction with a transverse transverse slot ( 34a ) and a longitudinal longitudinal slot ( 34b ) is formed and the transverse slot ( 34a ) Valve seat side is arranged. Valve body ( 10 ) according to claim 3, characterized in that the slot width of the transverse slot ( 34a ) greater than the slot width of the longitudinal slot ( 34b ) is selected. Valve body ( 10 ) according to claim 1, characterized in that the radial bore ( 34 ) is profiled in cross-section as an ellipse. Valve body ( 10 ) according to claim 5, characterized in that the longitudinal axis of the ellipse ( 34 ) runs in the axial direction. Valve body ( 10 ) according to claim 1, characterized in that the radial bore ( 34 ) is formed in cross section as a regular or irregular polygon. Magnetic valve ( 1 ) with a valve body ( 10 ) according to one of the preceding claims, comprising - a longitudinally movably guided anchor ( 50 ), - an electrically controllable magnetic coil ( 6 ) for moving the armature ( 50 ), and - one of the anchors ( 50 ) movable valve tappets ( 7 ) operatively connected to the closure element ( 40 ) of the valve body ( 10 ) can be brought.

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