JP4921718B2 - valve - Google Patents

Description

  The present invention is a valve comprising a valve closing body, wherein the valve closing body is operatively coupled to an actuator and cooperates with a valve seat, the actuator being disposed in the actuator chamber, and The present invention relates to a type in which a valve seat is arranged in a control chamber.

Valves with a valve closing body operatively connected to the actuator and adapted to cooperate with the valve seat are already known. The valve housing has an actuator chamber and a control chamber. The actuator chamber is connected to the control chamber via a guide passage. The valve closing body is supported in the guide passage. A very narrow guide gap having a large axial length between the guide passage and the valve closing body may be provided to seal the control chamber. This prevents the pressure medium from reaching the actuator chamber from the control chamber. The narrow guide gap serves, for example, to accurately align the magnet plunger with the magnet pot and the valve closure with the valve seat. In the case of this valve, the valve seat, the guide passage and the valve closure must be precisely matched to each other in terms of position and shape. Roundness errors or position errors can lead to valve non-tightness or even valve catching. Due to these high demands, this type of valve is very laborious and must be made expensive.
German Patent Application Publication No. 198226047

  The object of the present invention is therefore to improve the valve of the type mentioned at the outset to reduce the production costs and to make the switching time of the valve short and reproducible.

  According to the configuration of the present invention that solves the above problems, the valve closing body is formed by two parts, that is, the first closing body section and the second closing body section, and the first closing body section and the second closing body section are formed. A sealing element is provided between the closed body section and the sealing element so as to hermetically seal the control chamber with respect to the actuator chamber.

  The valve according to the invention has the advantage that the production costs are easily reduced. Furthermore, when configured as in the present invention, the pressure medium does not reach the actuator chamber from the control chamber, so that a short and reproducible switching time can be achieved.

  By means described in claim 2 and below, advantageous constructions and improvements of the valve described in claim 1 are possible.

  It is particularly advantageous if the sealing element is arranged in the valve chamber, which divides the valve chamber into two chambers that are closely isolated from each other and the first chamber is fluidly connected to the actuator chamber. Thereby, the actuator chamber is easily sealed against the pressure medium from the control chamber.

  According to an advantageous embodiment, the sealing element is an elastic sealing diaphragm made, for example, of elastomer or steel.

  A first closure section is applied to the actuator chamber side surface of the seal element with a first end face, and a second closure section is applied to the control chamber of the seal element with the second end face. It is very advantageous if applied to the side surface. This ensures that the stroke of the first closure section is completely transmitted to the second closure section.

  Furthermore, it is advantageous if the second closing body section is movable transversely to the valve opening direction of the valve closing body. In this way, the requirements for shape tolerances and position tolerances are clearly reduced, so that each part of the valve can be produced with little production effort and little cost.

  It is also advantageous if the first closing body section extends from the actuator chamber into the valve chamber through the guide passage. The narrow guide gap between the guide passage and the valve closing body positions the magnet plunger precisely with respect to the position relative to the magnet pot and guides the valve closing body.

  Furthermore, it is advantageous if the second closing section extends from the valve chamber into the control chamber through the decompression passage and reaches the outlet passage downstream from the valve seat. This is because the pressure in the valve chamber is reduced by the occurrence of pressure loss with respect to the pressure in the control chamber.

  Furthermore, it is advantageous if the pressure in the valve chamber is reduced with respect to the pressure in the control chamber by means of a sealing gap between the pressure reducing passage and the second closing body section. This is because the mechanical pressure load of the sealing element is reduced in this way, so that the sealing element can be constructed very thinly, flexibly and inexpensively.

  According to an advantageous configuration, the actuator is an electromagnet with a field coil and a magnet plunger. This is because electromagnets are a particularly inexpensive embodiment of actuators.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the drawing, a valve according to the invention is shown. This valve can be used, for example, in a device for controlling a gas exchange valve for an internal combustion engine as a two-port two-position switching valve, for example to control a hydraulic piston for adjusting the gas exchange valve .

  A device for controlling a gas exchange valve is known, for example, from DE 198 260 47 A1. The contents of the above specification are a prerequisite for the disclosure of the present application.

  However, the valve according to the invention can generally be used to control volume flow.

  The valve according to the invention has a housing 1 with an actuator housing 1.1 and a control housing 1.2. The actuator housing 1.1 and the control housing 1.2 are closely coupled to each other, for example, at the joint surface 7.

  In the actuator housing 1.1, an actuator 2 is arranged in the actuator chamber 10 for adjusting the valve closing body 3 in the axial direction. The actuator 2 is, for example, an electromagnet 4 including a field coil 5 and a magnet plunger 6. However, it is obvious that the valve closing body 3 may be adjusted by an actuator different from the electromagnet. The electromagnet 4 has a field coil 5 and a magnet plunger 6 in a so-called “magnet pot” 8. The magnet pot 8 is, for example, a part of the actuator housing 1.1. The magnet plunger 6 is surrounded by the field coil 5 in a ring shape in the magnet pot 8.

  The control housing 1.2 has a control chamber 11. A pressure medium under pressure exists in the control chamber 11. In contrast, no pressure medium is contained in the actuator chamber 10 of the actuator housing 1.1.

  The valve according to the invention has an inlet passage 15, an outlet passage 16 and a leak outlet 20. The inlet passage 15, the outlet passage 16 and the leak outlet 20 are provided in the control housing 1.2, for example. Each of the inlet passage 15 and the outlet passage 16 is fluidly connected to the control chamber 11 of the control housing 1.2, that is, is connected so that fluid can come and go.

  The inlet passage 15 is fluidly connected, for example, to the pressure line 17 on the upstream side, and the outlet passage 16 is fluidly connected to the control line 18 on the downstream side. The pressure line 17 is connected upstream to the high-pressure pump 32 according to, for example, DE 198 260 47 A1. The high-pressure pump 32 pumps a pressure medium, for example oil, under high pressure, via the valve according to the invention and the control line 18 to a hydraulic piston 33 that controls the gas exchange valve. The control line 18 is connected downstream to the hydraulic piston 33, for example according to DE 198 260 47.

  The leak outlet 20 is connected to a storage container 47 for storing a pressure medium, for example, via a leak pipe 46.

  The inlet passage 15 opens into the control chamber 11 in a direction transverse to the valve axis 25, for example. Starting from the control chamber 11, the outflow passage 34 extends in the direction of the valve axis 25. The outflow passage 34 opens into the outlet passage 16. A first shoulder 26 is formed at the end of the outflow passage 34 on the control chamber 11 side, and the valve seat 12 is provided on the first shoulder 26.

  The valve seat 12 has a conical shape, for example. The valve closing body 3 is formed, for example, in a spherical shape with a step portion 3.3 cooperating with the valve seat 12, and together with the valve seat 12 forms a sphere / conical seat. However, it will be appreciated that a cone / cone or the like may be provided. Line contact between the valve closure 3 and the valve seat 12 is achieved by means of a sphere / cone or a cone / cone. Line contact ensures a very good seal of the closed valve.

  According to the invention, the valve closing body 3 is formed by two parts: a first closing body section 3.1 and a second closing body section 3.2. The first closure body section 3.1 has a first end face 21 on the second closure body section 3.2 side, the second closure body section 3.2 comprising the first closure body section 3.2. 3. It has the 2nd end surface 22 by the side of 3.2. The first closure body section 3.1 is operatively coupled to the actuator 2, and the second closure body section 3.2 cooperates with the valve seat 12. The valve closing body 3 is formed, for example, in a cylindrical form as a spool by a first closing body section 3.1 and a second closing body section 3.2.

  The valve opening direction and the valve closing direction of the valve closing body 3 extend in the direction of the valve axis 25.

  The first closing body section 3.1 is mechanically coupled to, for example, the magnet plunger 6 and starts from the actuator chamber 10 and passes through the first guide passage 13 provided in the pot bottom 9 of the magnet pot 8 to the valve chamber. 30. The diameter of the guide passage 13 is at least partly larger than the diameter of the first closure section 3.1. As a result, a narrow guide gap 29 is formed between the guide passage 13 and the first closing body section 3.1. The role of the narrow guide gap 29 is to position the magnet plunger 6 accurately with respect to the position relative to the magnet pot 8 and guide the valve closure 3.

  The valve chamber 30 is formed, for example, in a cylindrical shape. The actuator housing 1.1 and the control housing 1.2 allow the valve chamber 30 to be, for example, a pot bottom 9 and a second of the actuator housing 1.1 disposed on the pot bottom 9. The shoulder 36 is defined by a third shoulder 37 disposed on the third end face 38 of the control housing 1.2 facing the pot bottom 9 and the third end face 38.

  The second closing body section 3.2 extends from the valve chamber 30 into the control chamber 11 through the decompression passage 39 and reaches, for example, the outflow passage 34. The outlet passage 16 extends laterally with respect to the valve axis 25 starting from the outflow passage 34.

  The second closure section 3.2 extends in the direction of the valve axis 25 beyond the outlet passage 16 that opens laterally into the outflow passage 34. The second closure section 3.2 is narrowed, for example, downstream of the stepped section 3.3 that cooperates with the valve seat 12. This allows the pressure medium to flow out of the control chamber 11 through the outflow gap 44 between the outflow passage 34 and the second closure section 3.2 when the valve is open.

  In order to divert the pressure medium from the outlet gap 44 into the outlet passage 16, the second closure section 3.2 is expanded in the vicinity of the outlet passage 16 and below the outlet passage 16 the sealing section 3. 4, the inner wall of the outflow passage 34 is reached. In this way, the second closing body section 3.2 closes and seals the outflow passage 34 in the direction of the valve axis 25 under the sealing section 3.4. As a result, all the pressure medium is diverted into the outlet passage 16. Below the seal section 3.4 of the second closure section 3.2, the extension of the outflow passage 34 forms a leak outlet 20 in the direction of the valve axis 25. The leak outlet 20 is connected to the storage container 47 via a leak line 46.

  The decompression passage 39 serves to clearly reduce the pressure in the valve chamber 30 relative to the pressure in the control chamber 11. For this purpose, a sufficiently small sealing gap 40 is provided between the decompression passage 39 and the second closure section 3.2. As a result, a pressure loss corresponding to the pressure difference between the control chamber 11 and the valve chamber 30 is generated. Furthermore, the decompression passage 39 has the function of guiding the second closing body section 3.2.

  The second closure section 3.2 is movable laterally with respect to the valve axis 25 by the size of the seal gap 40 in the decompression passage 39. In this way, eccentric errors due to manufacturing can be compensated.

  According to the invention, a sealing element 19 is provided between the first end face 21 of the first closure body section 3.1 and the second end face 22 of the second closure body section 3.2. The sealing element 19 hermetically seals the valve chamber 30 with respect to the actuator chamber 10. Thus, since the pressure medium does not reach the actuator chamber 10 from the control chamber 11, a short and reproducible switching time can be achieved.

  According to an advantageous configuration, the sealing element 19 is arranged in the valve chamber 30. The valve chamber 30 is divided by the sealing element 19 into two chambers that are closely separated from each other. The first chamber 51 is fluidly connected to the actuator chamber 10, and the second chamber 52 is sealed with respect to the control chamber 11 by the seal gap 40.

  The seal element 19 is, for example, an elastic seal diaphragm. The seal diaphragm is made, for example, from an elastomer, plastic or metal, such as steel.

  The sealing element 19 is laterally outward with respect to the valve axis 25 starting from the first end face 21 of the first closure body section 3.1 and the second end face 22 of the second closure body section 3.2. It extends toward the top and is fixed to the housing 1 in the region of the inner wall 43 of the valve chamber 30. The sealing element 19 is, for example, a joint surface 7 between the actuator housing 1.1 and the control housing 1.2, for example the second shoulder 36 of the actuator housing 1.1 and the third shoulder of the control housing 1.2. 37 is tightly clamped between. For example, atmospheric pressure dominates the surface of the seal element 19 on the actuator chamber 10 side.

  Starting from the control chamber 11, a slight leak amount of the pressure medium reaches the valve chamber 30 through the seal gap 40. The pressure of the pressure medium in the valve chamber 30 is reduced by the pressure loss of the seal gap 40. Due to the slight pressure in the valve chamber 30, the sealing element 19 is only slightly mechanically loaded, so that it can be formed flexibly and inexpensively on a thin wall. The sealing element 19 makes it possible to easily seal the control chamber 11 and the valve chamber 30 with respect to the actuator chamber 10. The pressure medium in the valve chamber 30 flows to the leak outlet 20 via the return passage 45 provided in the second closing body section 3.2 and returns to the storage container 47 via the leak line 46. It is.

  A spring element 23 acts on the valve closing body 3. The spring element 23 presses the valve closing body 3 in the direction opposite to the valve seat 12. As a result, the second closure body section 3.2 is always applied to the sealing element 19 with the second end face 22, and the sealing element 19 always has the first end face of the first closure body section 3.1. 21. In this way, it is ensured that the stroke of the actuator 2 is completely transmitted via the first closure body section 3.1 to the second closure body section 3.2. The spring element 23 is, for example, a coil spring. The spring element 23 is arranged, for example, below the seal section in the leak outlet 20 and has a second closure body section 3 present at one end, for example at the end of the valve closure body 3 on the outlet passage 16 side. .. is applied to the fourth end face 50 of.

  The magnet plunger 6, the first guide passage 13, the first closure body section 3.1, the second closure body section 3.2, the decompression passage 39, the spring element 23 and the valve seat 12 are concentric with one another, for example with respect to the valve axis 25. Are arranged. Actuator 2, in cooperation with spring element 23, opens valve closing body 3 with first closing body section 3.1 and second closing body section 3.2 for opening and closing the valve. Can be moved in the direction of the valve axis 25.

  The eccentric error due to the production can be compensated by the possibility of movement of the second closing body section 3.2 in a direction transverse to the valve opening direction 25 of the valve closing body 3.

  For example, the valve according to the present invention is opened when the actuator 2 is turned off and closed when the actuator 2 is turned on. However, this relationship can be reversed by reversing the acting direction of the spring element 23.

  When the field coil 5 is energized, a magnetic field is generated in the magnet pot 8, and the magnet pot 8 pulls the magnet plunger 6 in the direction of the pot bottom 9 of the magnet pot 8, for example. Since the first closure body section 3.1 is mechanically connected to the magnet plunger 6, the first closure body section 3.1 performs the same stroke as the magnet plunger 6 in the direction of the valve seat 12. The stroke is then completely transmitted to the second closure section 3.2 against the force of the spring element 23.

  As long as the valve closure 3 is applied to the valve seat 12 with the second closure section 3.2, the valve is closed. As a result, the pressure medium cannot reach the outlet passage 16 from the control chamber 11.

  When the field coil 5 is de-energized, the magnetic field is no longer effective, so that the valve closing body 3 is separated from the valve seat 12 by the spring element 23 acting as a return spring and returns to its starting position again. Be made. As a result, the valve is opened again.

  When the valve is opened, the pressure medium flows into the control chamber 11 through the inlet passage 15, and from the control chamber 11 into the control line 18 through the outlet passage 34 and the outlet passage 16 in the direction of the hydraulic piston 33. To flow.

  Due to the fact that the valve closing body 3 is composed of two parts and that the second closing body section 3.2 has the possibility of lateral movement, the first closing body section 3.1 and the second closing body section 3.1 Larger position shifts with respect to the closed body section 3.2 can also be compensated, so that narrow shape tolerances and position tolerances are not required, and the manufacturing costs of the valve are reduced. For background art, narrow shape and position tolerances are avoided and can be replaced by larger shape and position tolerances.

FIG. 3 shows an embodiment of a valve according to the invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Housing, 1.1 Actuator housing, 1.2 Control housing, 2 Actuator, 3 Valve closing body, 3.1 1st closing body section, 3.2 2nd closing body section, 3.3 Step part, 3 .4 seal section, 4 electromagnet, 5 field coil, 6 magnet plunger, 7 joint surface, 8 magnet pot, 9 pot bottom, 10 actuator chamber, 11 control chamber, 12 valve seat, 13 guide passage, 15 inlet passage, 16 Outlet passage, 17 pressure line, 18 control line, 19 sealing element, 20 leakage outlet, 21 first end face, 22 second end face, 23 spring element, 25 valve axis, 26 first shoulder, 29 guide Gap, 30 Valve chamber, 32 High pressure pump, 33 Hydraulic piston, 34 Outflow passage, 36 2 shoulder, 37 third shoulder, 38 third end face, 39 decompression passage, 40 seal gap, 43 inner wall, 44 outflow gap, 45 return passage, 46 leak line, 47 storage container, 50 fourth End face, 51 first chamber, 52 second chamber

Claims (7)

A valve comprising a valve closing body (3), said valve closing body (3) being operatively coupled to an actuator (2) and cooperating with a valve seat (12), said actuator (2) is arranged in the actuator chamber (10), and the valve seat (12) is arranged in the control chamber (11), the valve closing body (3) has two parts. The first closure body section (3.1) and the second closure body section (3.2), the first closure body section (3.1) and the second closure body Between the body section (3.2), a sealing element (19) formed as an elastic sealing diaphragm is located between the actuator chamber (10) and the control chamber (11) (valve chamber ( 30), the sealing element (19) 0) is divided into a first chamber (51) on the actuator chamber (10) side and a second chamber (52) on the control chamber (11) side, which are closely separated from each other, and A control chamber (11) is sealed with respect to the actuator chamber (10), and the control chamber (11) is provided with an inlet passage (for supplying a pressure medium under pressure) ( 15), the control chamber (11) and the second chamber (52) are disposed adjacent to each other, and between the control chamber (11) and the second chamber (52). A seal that seals the second chamber (52) to the control chamber (11) and reduces the pressure in the second chamber (52) relative to the pressure in the control chamber (11) There is a vacuum passage (39) formed as a gap (40), The second chamber (52) is connected to a storage container (47) via a return passage (45) provided in the second closure body section (3.2). valve.   2. The valve according to claim 1, wherein the sealing element (19) is made of elastomer or steel.   The first closure body section (3.1) is applied with the first end face (21) to the surface of the sealing element (19) on the actuator chamber (10) side, and the second closure body section The valve according to claim 1, wherein (3.2) is applied to the surface of the sealing element (19) on the side of the control chamber (11) with a second end face (22).   The valve according to claim 1, wherein the second closure body section (3.2) is movable transversely to the valve opening direction of the valve closure body (3). First closure section (3.1) extends through the guide passage (13) the actuator chamber (10) as a starting point to the valve chamber (30) in claim 1 the valve as claimed. The second closing body section (3.2) extends from the valve chamber (30) to the control chamber (11) through the decompression passage (39) and extends into the outflow passage (34). The valve of claim 1 , wherein the valve is reached downstream of the valve.   The valve according to claim 1, wherein the actuator (2) is an electromagnet (4) with a field coil (5) and a magnet plunger (6).

Images