阅读说明：本技术 阀 (Valve with a valve body ) 是由 R·博南诺 于 2018-12-19 设计创作，主要内容包括：本发明涉及一种阀,包括：壳体(1)；布置在壳体(1)中的螺线管(5)；可由螺线管(5)移动的杆(7)；与杆(7)连接的罐形的活塞(8)；布置在壳体(1)中的、使活塞(8)相对于壳体(1)密封的密封件(14)。密封件(14)是具有径向位于内部的密封面(15)的盘片,该盘片在径向外边缘处被夹紧在壳体(12、11)中。(The invention relates to a valve comprising: a housing (1); a solenoid (5) arranged in the housing (1); a rod (7) movable by the solenoid (5); a pot-shaped piston (8) connected to the rod (7); a seal (14) arranged in the housing (1) for sealing the piston (8) with respect to the housing (1). The seal (14) is a disk having a radially inner sealing surface (15), which is clamped in the housing (12, 11) at the radially outer edge.)

1. A valve comprising a housing and a solenoid arranged in the housing, wherein the solenoid comprises a coil, an armature, an upper stator and a lower stator, the stators being designed such that the armature moves axially when a magnetic force acts between the stators, the valve further comprising a rod fixedly connected to the armature, a pot-shaped piston connected to the rod, and a spring which moves the piston away from the solenoid when the magnetic force is removed,

it is characterized in that the preparation method is characterized in that,

a protective sleeve (21) made of a corrosion-resistant material is arranged in the solenoid (5).

2. Valve according to claim 1, characterized in that the protective sleeve (21) is made of stainless steel.

3. Valve according to claim 2, characterized in that the protective sleeve (21) is made of chrome nickel steel.

4. Valve according to at least one of the preceding claims, characterized in that the protective sleeve (21) has a wall thickness of 0.1 to 0.5mm, preferably 0.2 to 0.4mm, in particular 0.25 mm.

5. Valve according to at least one of the preceding claims, characterized in that a protective sleeve (21) is arranged between the armature (20) and the upper and lower stators (16, 17).

6. A valve according to claim 5, characterized in that the protective sleeve (21) is pressed into a gap (19) in the upper stator (16), there being a radial air gap between the lower stator (17) and the protective sleeve (21).

7. Valve according to claim 5, characterized in that the protective sleeve (21) has a flange (23) which abuts against the lower stator (17).

8. Valve according to at least one of the preceding claims, characterized in that the protective sleeve (21) is overmolded by the housing (1) at least in a partial region of the flange (23).

Technical Field

The invention relates to a valve comprising a housing and a solenoid arranged in the housing, wherein the solenoid comprises a coil, an armature, an upper stator and a lower stator, the stator being designed such that the armature moves axially when a magnetic force acts between the stators, the valve further comprising a rod fixedly connected to the armature, a pot-shaped piston connected to the rod, and a spring which moves the piston away from the solenoid when the magnetic force is removed.

Background

Such valves are primarily used as air-switching valves in turbochargers in motor vehicles in order to open a bypass to the intake side during freewheeling and are therefore known. In order to prevent too violent braking of the turbocharger, but also to ensure rapid starting, rapid opening and closing of the valves is an important prerequisite. Particularly when closing, it is important that immediate closing is achieved by the piston being placed on the valve seat. The valve seat is formed by the housing of the turbocharger to which the valve is flanged. In this case, the axially displaceable piston is sealed off from the housing. The piston has an opening so that the medium present in the bypass line can enter the interior of the valve. This pressure equalization is used to open and close the valve. The disadvantage here is that the medium contains aggressive components which attack the magnetic material of the valve, so that the magnetic material is subject to corrosion. As a result, power loss and functional impairment occur.

Disclosure of Invention

It is therefore an object of the present invention to provide a valve which is not or only very little subject to corrosion damage over the entire service life. Furthermore, the valve should be simple to construct.

This object is achieved in that a protective sleeve made of a corrosion-resistant material is arranged in the solenoid. This arrangement of the protective sleeve requires little effort and provides reliable protection against aggressive components of the medium flowing in the bypass line. The protective sleeve can be produced simply and the installation of the protective sleeve requires only a few additional work steps.

In order to protect the magnetic material against corrosion, it is advantageous if the protective sleeve is made of a durable plastic. Due to the forces and movements that act in the solenoid, the plastic must have a certain wall thickness. According to a further embodiment, it has proven advantageous if the protective sleeve is made of stainless steel. In addition to the excellent protective properties, stainless steel also has sufficient stability to form a protective sleeve with a small wall thickness, so it has proven advantageous for the protective sleeve to be designed with a wall thickness of 0.1mm to 0.5mm, preferably 0.2mm to 0.4mm, in particular 0.25 mm. The advantage is that the solenoid need only be slightly modified for the use of such a protective sleeve. No costly redesign of the valve is required and existing valves can be retrofitted with little cost.

A cost-effective embodiment consists in that the protective sleeve is made of chrome-nickel steel.

According to a further advantageous embodiment, those components to be protected are reliably protected by the fact that a protective sleeve is arranged between the armature and the upper and lower stators. The maximum protection effect is ensured by the way that the protective sleeve directly surrounds the respective component.

In a further embodiment, the protective sleeve is pressed into a recess in the upper stator, while the protective sleeve is separated from the lower stator by a radial air gap. The air gap is a few tenths of a millimeter. The press-fit ensures that the protective sleeve remains in its installed position even in the event of a strong force acting on the valve from the outside.

If the upper stator has a central recess into which the armature enters when the solenoid is energized, a particularly advantageous embodiment provides that the protective sleeve is pressed into the recess in the upper stator. On the one hand, the protective sleeve can therefore be designed as a cylindrical/cylindrical component and therefore constructed very cost-effectively. On the other hand, the protective sleeve is responsible for guiding the armature both when the valve is open and when it is closed.

Due to the influence of heat, the components of the solenoid may move relative to each other. In order to avoid the introduction of voltage into the solenoid, it has proven advantageous to press the protective sleeve into the recess of the upper stator in such a way that the upper edge of the protective sleeve is arranged in the upper stator without being blocked.

In a further advantageous embodiment, the protective sleeve has a collar which rests against the lower stator. With this flange, on the one hand, the possibility of aggressive components from the bypass line entering into hazardous areas is prevented. On the other hand, the collar serves as a stop during the pressing-in, so that a defined mounting of the protective sleeve can be achieved in a particularly simple manner.

In a further embodiment, additional protection of the magnetic material and permanent fixing of the protective sleeve are achieved in that the protective sleeve is overmolded by the housing at least in the partial region of the collar.

Drawings

The present invention is described in detail in one embodiment. Shown in the drawings

Fig. 1 shows a cross-sectional view of a valve according to the prior art, an

Fig. 2 shows an enlarged sectional view of the valve according to the invention in the region of the spiral.

Detailed Description

Fig. 1 shows a valve comprising a housing 1. Furthermore, the housing 1 has an integrally formed flange 3, by means of which the housing 1 is flanged to a turbocharger, not shown, in the region of the bypass line. The electrical contact of the solenoid 5, which is arranged in the housing 1, is achieved via the socket 2. The solenoid 5 has a coil 6 which acts on a metal rod 7. The metal rod 7 is connected to a pot-shaped piston 8, which has a sealing surface 10 on the periphery of its base 9, which sealing surface interacts with a valve seat, not shown. Here, the spring 7a urges the piston 8 toward the valve seat. The housing 1 also has a cylindrical section 11 which extends in the direction of the piston 8. A cylindrical bushing (Zylinderbuchse)12 connected to the housing surrounds the cylindrical section 11. The cylindrical liner 12 has a radially inward flange 13 on which a seal 14 is placed. The seal 14 seals the piston 8 in this case against the housing 1. An opening 15 in the piston 8 enables pressure equalization in the valve. But thereby also aggressive components of the exhaust gas enter the interior of the valve. The solenoid 5 includes an upper stator 16 and a lower stator 17. The two stators each have a central recess 19, 18. In the unenergized state of the solenoid 5, the armature 20, which is fixedly connected to the metal rod, is located in the recess 18 of the lower stator 17. When the solenoid 5 is energized, the armature 20 and the metal rod 7 with the piston 8 are pulled upwards with the armature. In this case, the armature 20 enters the recess 19 of the upper stator 16.

In fig. 2, a valve according to the invention is shown, wherein the armature, the rod and the piston are not shown. The valve has a protective sleeve 21 made of chrome-nickel steel with a wall thickness of 0.3 mm. The protective sleeve has a cylindrical section 22 which merges at the lower end into a flange 23. The protective sleeve is pressed with its cylindrical section 22 into the recess 19 of the upper stator 16. The protective sleeve 21 is pressed in to such an extent that, in the mounted state, the flange 23 bears against the lower end of the coil 6. Here, a rubber coating on the protective sleeve 21 is used to improve the sealing. The radially outer edge of the flange 23 is over-cast/over-moulded by the housing 1, whereby a good sealing is achieved.