DE102007053649B3 - Pressure regulating valve for use in common-rail-device to ignite internal combustion engine of motor vehicle, has pressurized valve lifter projected to closing member with radial clearance, and flow opening connected with settling chamber - Google Patents

Abstract

The valve has an armature (5) that is movable against a closing direction by a flow of a solenoid coil (7) of an electromagnet. A valve chamber (17) is subdivided into an inlet chamber (38) close to a valve seat (19) and a settling chamber (39) remote to the valve seat. A baffle plate (37) includes an end-to-end central opening (40), by which a pressurized valve lifter (10) is projected to a closing member (18) with a radial clearance. A flow opening (26) is connected with the settling chamber. A connecting opening is arranged in the baffle plate.

Description

The The invention relates to a pressure regulating valve for regulating high pressures in a liquid, with one on a valve housing arranged valve piece, in which a supply channel is formed on a cone-like Valve seat opens into a valve chamber, the cone expanding towards the valve space, with a spherical closure member, that up to the contact with the cone wall of the valve seat in the cone the valve seat submersible and the valve passage closing on the cone wall of the valve seat is placed, with one or more outflow openings in the radially circumferential side wall of the valve chamber, as well as with a loading ram, through one end face of the closing member in the closing direction kraftbeaufschlagt, with a via a magnet armature the loading ram in the closing direction acting spring, wherein the armature by energizing a magnetic coil an electromagnet is movable counter to the closing direction.

such Pressure control valves are z. B. in common rail facilities for self-igniting internal combustion engines applied by motor vehicles and ensure that the system pressure in the high-pressure accumulator is kept constant. As soon as the pressure in the high-pressure accumulator reaches the System pressure exceeds that opens Normally closed pressure control valve and carries fuel in a pressureless container from.

If the pressure has fallen below the system pressure again, closes the pressure control valve again. This will ensure that the Fuel injection into the cylinders of the engine below constant conditions.

Of the System pressure in the common rail facilities may well be in the Magnitude be of 2,200 bar.

This leads to high loads of acted upon by the fuel behind the valve seat valve components by radiation erosion, cavitation and dirt particles in fuel also by abrasion.

From the DE 101 63 235 A1 Already a solenoid valve for the hydraulic control of automatic transmissions is known. In this solenoid valve, a valve piece is arranged on a valve housing. In this valve piece, a supply channel and a valve seat with a spherical closure member is provided. In the flow from the supply channel to the return a baffle plate is provided.

From the DE 90 02 383 U1 Another solenoid valve for hydraulic controls is known. In this solenoid valve, a valve piece is arranged on a valve housing. In this valve piece, a supply channel and a valve seat with a spherical closure member is provided. At this closing member can be supported by an electromagnet with a force plunger. In an arranged between the supply channel and the drain passage valve space a baffle plate is provided. Due to the special design of this baffle plate and by their interaction with labyrinth discs, the fluid flow is deflected away by a plunger guide bore of the plunger. As a result, this plunger guide bore and the adjoining armature space remains largely free of entrained in the fluid flow dirt particles and chips. This prolongs the functioning of the solenoid valve and reduces the hysteresis.

task The invention is therefore a pressure control valve of the aforementioned To create a kind of destruction and a wear of Valve components by flow effects at least substantially reduced or even avoided.

These Task is inventively characterized solved, that the Valve chamber through a baffle plate in a closer to the valve seat inflow and a the valve seat remote calming space is divided, the Baffle plate has a continuous central opening through which the loading plunger to closing member protrudes with radial clearance, and wherein the outflow openings connected to the calming room.

By this training takes place in the liquid-filled inflow a Reduction of the energy of passing through the valve passage Liquid jet so that its momentum do not hit the loading tappet and falsify the control process can.

About the central opening the liquid passes calm and continuously flowing into the calming room, to get over from there the outflow openings flow away to be able to.

Next the central opening can in the baffle one or more continuous connection openings be arranged so that it not to a regulation-distorting Back pressure in the inflow space comes.

Preferably are the connection openings equally distributed arranged on a concentric circle.

The Baffle plate may be integrally formed with the valve housing.

In an easily produced training but can also the baffle plate be a separate insertable in the valve chamber insert.

has while the baffle plate at its peripheral edge a the side wall the inflow space forming pipe approach, so leads this continues to a simple mountability.

Around a wear yet To further reduce or even completely avoid the baffle plate and / or the pipe socket made of a wear-resistant material or at the inlet space facing Side have a coating of a wear-resistant material.

To a wear-reducing Impact of the liquid jet below one of 90 ° essential deviating angle leads it when the charge plunger to his the closing member having a conical taper on the end side, with him through the central opening protrudes.

going the conical rejuvenation at her the closing member opposite end over a radius in a radial extension of the loading ram over, so becomes the liquid flow to further calm in the calming room deflected radially outward.

there Radial expansion can proceed from conical rejuvenation be inclined away from the baffle plate.

extends the Radialerweiterung so close to the side wall of the calming room that between the radial circumferential surface of the Radial extension and the sidewall of the settling chamber a throttle gap is formed and the throttle gap to that of the cylindrical lateral surface of the actuating tappet overlapping mouth area the outflow openings leads, so there is a calmed supply of liquid to the outflow openings.

to exact alignment, the actuating plunger in one guide bore of the valve housing slidably guided be, in easily manufacturable manner, the guide bore an axial continuation the calming chamber can be.

to Reducing the braked and calming mass, the Loading plunger one Have cavity.

In order to are also shocks when Reaching the closing and opening positions largely avoided.

to Connection of the cavity with the settling chamber, the cavity via a or a plurality of radial bores with the mouth region of the outflow openings be connected.

is the cavity over a diaphragm with the end of the guide bore facing away from the baffle plate connected, so can at an opening stroke in the guide hole contained liquid over the Aperture are displaced into the cavity of the loading ram, resulting in a damping of the opening movement leads.

Of the Feed channel preferably has a throttle point.

In A preferred application is the supply channel with a high-pressure fuel storage and the outflow openings with a tank of a common rail device of a motor vehicle connected.

One embodiment The invention is illustrated in the drawing and will be described below described in more detail. Show it

1 a cross section of a pressure control valve

2 an enlarged section "A" of the pressure control valve after 1

3 a cross section of an enlarged section of the region of the valve chamber of the pressure control valve according to 1 ,

The pressure control valves shown in the figures have a valve housing 1 with a centric bore 4 in which one end region is a core 2 an electromagnet is used.

At the hole 4 directed end of the core 1 is a helical compression spring 3 with one end supported, the other with one end in the hole 4 sliding anchor 5 subjected to bias.

In an annular chamber 6 of the valve housing 1 is an energetic solenoid 7 on a coil carrier 8th arranged so that they are at a radial distance from the core 2 and the anchor 5 largely encloses.

By energizing the solenoid 7 via a coil connection 24 a magnetic field is generated by which the armature 5 against the force of the helical compression spring 3 to the core 2 is too movable.

With his the core 2 facing away from the armature 5 one in a to the Boh tion 4 coaxial guide bore 9 slidably guided loading ram 10 ,

In this case, a coaxial Beaufschlagungszapfen protrudes through 11 of the loading tappet 10 a coaxial feedthrough bore 12 in one the bore 4 from the pilot hole 9 separating partition 13 of the valve housing 1 ,

Because the through-hole 12 has a smaller diameter than the guide bore 9 and the impeller 10 , forms the partition 13 a stop for movement of the loading tappet 10 towards the core 2 ,

The impeller 10 has a cavity 14 up, over an aperture 15 with the guide hole 9 on the partition 13 facing side is connected.

About radial bores 16 in its other end region and between the outer surface of the loading tappet 10 and the wall of the guide bore 9 formed throttle gap 25 is the cavity 14 with one on the the admission pin 11 opposite end of the guide bore 9 arranged valve space 17 connected.

At its the loading pin 11 opposite end is the loading ram 10 with a conical rejuvenation 34 formed and acted upon with the end face of this end a spherical closure member 18 ,

By the force of the helical compression spring 3 gets over the anchor 5 and the impeller 10 the closing member 18 for engagement with the cone wall of a cone-like valve seat 19 applied.

The closing member 18 opposite a feed channel opens 20 in the cone of the valve seat 19 , wherein the last opening into the cone region of the feed channel 20 as throttle point 21 is trained.

The feed channel 20 and the valve seat 19 are in a valve piece 22 formed, which has a flared connection 23 firmly with the valve housing 1 connected is.

By the force of the helical compression spring 3 is the valve passage when the solenoid is de-energized 7 closed because the force of the helical compression spring 3 greater than the force of the over the supply channel 20 on the closing member 18 acting pressure in a high-pressure fuel storage, not shown, a common rail device of a motor vehicle.

By the energization of the magnetic coil 7 the magnetic force generated thereby acts against the force of the helical compression spring 3 on the anchor 5 so that the on the closing member 18 acting force in the closing direction is reduced to a height corresponding to the force of the pressure to which the system pressure in the high-pressure fuel storage is to be limited.

If this determined by the magnetic force system pressure in the high-pressure fuel storage is exceeded, lifts the closing member 18 from the valve seat 19 so that fuel over the valve space so long 17 and in the side wall of the valve chamber 17 trained and connected to a non dargestell th unpressurized tank outflow 26 can flow into the tank until the pressure in the high-pressure fuel storage has fallen below the certain system pressure again.

Then the valve passage of the pressure regulating valve is closed again.

As in 2 can be seen, the cone of the valve seat opens 19 via a cone-shaped outflow area 27 in the valve room 17 ,

Here is the opening angle 28 the cone of the outflow area 27 with 105 ° greater than the opening angle 29 the cone of the valve seat 19 of 90 °.

At the transition from the cone of the valve seat 19 to the cone of the outflow area 27 is a transition radius 30 and at the transition from the discharge area 27 in the bottom wall 31 of the valve chamber 17 is a transition radius 32 formed, with both transition radii 30 and 32 0.6 times the diameter of the closing element 18 exhibit.

Over the level of the bottom wall 31 protrudes on the valve seat 19 seated closing member 18 with a supernatant 33 0.2 times its diameter out into the valve chamber 17 ,

The impeller 10 has at its the closing member 18 impinging end a conical rejuvenation 34 on that over a radius 35 in a radial extension 36 passes over, starting from the conical rejuvenation 34 away from the closing member 18 removing inclined.

The valve room 17 is through a baffle plate 37 in a valve seat 19 closer inflow space 38 and one the valve seat 19 distant calming room 39 divided.

In this case, the baffle plate 37 a durchge central opening 40 on, through which the loading plunger 10 with its conical rejuvenation 34 protrudes with radial play.

Furthermore, connection openings are evenly distributed on a concentric pitch circle 44 arranged the inflow space 38 with the calming room 39 connect.

The flapper 37 has at its peripheral edge a pipe socket 41 , with its inner wall, the radially encircling side wall of the inflow space 38 forms.

With an axial ring shoulder 42 in the area of the baffle plate 37 That's one end of the pipe socket 41 at a stage 43 of the gradually expanding valve space 17 supported while the other end of the pipe socket 41 on the bottom wall 31 is supported.

1

valve housing

2

core

3

Helical compression spring

4

drilling

5

anchor

6

annular chamber

7

solenoid

8th

coil carrier

9

guide bore

10

Beaufschlagungsstößel

11

Beaufschlagungszapfen

12

Through-hole

13

partition wall

14

cavity

15

cover

16

radial bores

17

valve room

18

closing member

19

valve seat

20

supply channel

21

restriction

22

valve piece

23

flare

24

coil terminal

25

throttle gap

26

outflow openings

27

outflow region

28

opening angle outflow region

29

opening angle valve seat

30

Transition radius

31

bottom wall

32

Transition radius

33

Got over

34

conical rejuvenation

35

radius

36

radial expansion

37

flapper

38

inflow

39

killing space

40

central opening

41

crude batch

42

annular shoulder

43

step

44

connecting ports

Claims (19)

A pressure regulating valve for controlling high pressures in a liquid, comprising a valve body arranged on a valve body in which a supply channel is formed, which opens at a cone-like valve seat in a valve chamber, wherein the cone widens toward the valve chamber, with a spherical closing member, the abutting the conical wall of the valve seat into the cone of the valve seat and the valve passage is placed on the conical wall of the valve seat, with one or more outflow openings in the radially circumferential side wall of the valve chamber, and with a Beaufschlagungsstößel, by one end face of the closing member in Closing force is acted upon, with a force acting on a magnet armature the Beaufschlagungsstößel in the closing direction spring, wherein the armature by energizing a solenoid coil of an electromagnet opposite to the closing direction is movable, characterized in that the Ventilra around ( 17 ) by a baffle plate ( 37 ) in a valve seat ( 19 ) closer inflow space ( 38 ) and a valve seat ( 19 ) further calming room ( 39 ), wherein the baffle plate ( 37 ) a continuous central opening ( 40 ) through which the Beaufschlagungsstößel ( 10 ) to the closing member ( 18 ) protrudes with radial clearance, and wherein the outflow openings ( 26 ) with the calming room ( 39 ) are connected. Pressure control valve according to claim 1, characterized in that in the baffle plate ( 37 ) one or more continuous connection openings ( 44 ) are arranged. Pressure control valve according to claim 2, characterized in that the connection openings ( 44 ) are arranged evenly distributed on a concentric circle. Pressure control valve according to one of the preceding claims, characterized characterized in that the baffle plate in one piece with the valve body is trained. Pressure control valve according to one of claims 1 to 3, characterized in that the baffle plate ( 37 ) a separate in the valve chamber ( 17 ) insertable part is. Pressure control valve according to claim 5, characterized characterized in that the baffle plate ( 37 ) at its peripheral edge a Be the wall of the inflow space ( 38 ) forming tube approach ( 41 ) having. Pressure control valve according to one of the preceding claims, characterized characterized in that the baffle plate and / or the pipe socket is made of a wear-resistant material or the inflow space facing side a coating of a wear-resistant Material has. Pressure control valve according to one of the preceding claims, characterized in that the loading ram ( 10 ) to its the closing member ( 18 ) acting on the end face a conical taper ( 34 ), through which it passes through the central opening ( 40 protrudes. Pressure control valve according to claim 8, characterized in that the conical taper ( 34 ) at its the closing member ( 18 ) opposite end over a radius ( 35 ) into a radial extension ( 36 ) of the loading tappet ( 10 ) passes over. Pressure control valve according to claim 9, characterized in that the radial expansion ( 36 ) starting from the conical taper ( 34 ) from the baffle plate ( 37 ) is inclined away. Pressure control valve according to one of claims 9 and 10, characterized in that the radial expansion ( 36 ) so close to the side wall of the calming room ( 39 ) extends, that between the radially encircling lateral surface of the radial extension ( 36 ) and the side wall of the calming room ( 39 ) a throttle gap ( 25 ) is formed. Pressure control valve according to claim 11, characterized in that the throttle gap ( 25 ) to that of the cylindrical lateral surface of the actuating tappet ( 10 ) covered mouth region of the outflow openings ( 26 ) leads. Pressure control valve according to one of the preceding claims, characterized in that the actuating tappet ( 10 ) in a guide bore ( 9 ) of the valve housing ( 1 ) is guided displaceably. Pressure control valve according to claim 13, characterized in that the guide bore ( 9 ) an axial continuation of the settling chamber ( 39 ). Pressure control valve according to one of the preceding claims, characterized in that the loading ram ( 10 ) a cavity ( 14 ) having. Pressure control valve according to claim 15, characterized in that the cavity ( 14 ) via one or more radial bores ( 16 ) with the mouth region of the outflow openings ( 26 ) connected is. Pressure control valve according to claim 15, characterized in that the cavity ( 14 ) via a diaphragm ( 15 ) with the baffle plate ( 37 ) facing away from the end of the guide bore ( 9 ) connected is. Pressure control valve according to one of the preceding claims, characterized in that the supply channel ( 20 ) a throttle point ( 21 ) having. Pressure control valve according to one of the preceding claims, characterized in that the supply channel ( 20 ) with a high-pressure fuel storage and the outflow openings ( 26 ) are connected to a tank of a common rail device of a motor vehicle.