Solenoid valve

Abstract

An electromagnetic valve with an electromagnetic circuit (6) consisting of a coil (10) wound on a coil carrier (8), an armature (12), a core (14), and a return mechanism (16), wherein the armature (12) has an active contour directed towards the core (14) which is in electromagnetic operative connection with an active contour of the core (14), such that the core (14) has an extension (30) which is movable into or out of a recess (32) of the armature (12) and vice versa, wherein an armature active surface (40), which is designed as an armature collar surface, and a core active surface (38), which is designed as a core end face, are provided, wherein the armature active surface is determined according to the formula μ × ra12 - μ × ra22 and the core active surface (38) is determined according to the formula μ × rk12 - μ × rk22 is calculated, where the size ratio of anchor effective area (40) to core effective area (38) is between (0.8 to 1.2) : 1.

Description

[0001] The invention relates to an electromagnetic valve with an electromagnetic circuit consisting of a coil wound on a coil carrier, an armature, a core and a return mechanism, wherein the armature has an active contour directed towards the core, which is in electromagnetic operative connection with an active contour of the core, such that the armature has an attachment that is movable into a recess of the core or vice versa, wherein an attachment surface and a collar surface are provided.

[0002] Such solenoid valves are well known in the art. They are used, for example, as actuators for so-called bypass valves, electropneumatic valves, or as actuators for positioning devices. When designing the electromagnetic circuit, it is particularly important to achieve a high magnetic force as quickly as possible, i.e., with a short stroke, and to ensure that this force remains as constant and linear as possible over the entire stroke range, as this is the only way to ensure precise control of the respective solenoid valve. Examples of such solenoid valves are mentioned in DE 10 2010 010 187 B4 and DE 10 2012 101 634 A1. Given the constantly increasing demands in the automotive sector for reduced installation space combined with increased performance, currently known solenoid valves have the disadvantage of requiring insufficient magnetic force.

[0003] The object of the invention is therefore to provide an electromagnetic valve that has a high magnetic force with a constant curve in a small installation space.

[0004] This problem is solved by ensuring that the size ratio of the mounting surface to the collar area is between (0.8 and 1.2):1. This makes it possible to achieve a high, constant magnetic force even with a very large stroke. Advantageously, the size ratio of the mounting surface to the collar area is 1:1.

[0005] The surfaces of the attachment and the recess facing each other can be cylindrical. However, for a particularly advantageous linear force distribution, the surfaces of the attachment and the recess facing each other are conically shaped. The conicity angle α, relative to the longitudinal axis, is between 3° and 13°, preferably 8°.

[0006] The invention is explained in more detail with reference to a drawing, which shows:

[0007] Fig. 1 a sectional view of a recirculating air valve according to the invention,

[0008] Fig. 2 a detailed view of the solenoid valve from Fig. 1, and

[0009] Fig. 3 A representation of the course of the magnetic force over the valve stroke of the solenoid valve.

[0010] Fig. Figure 1 shows a sectional view of an electromagnetic valve according to the invention. 2 , which in the present embodiment is designed as a thermovalve that is used in the cooling circuit to interrupt the cooling circuit during the start-up phase of the internal combustion engine in order to ensure faster heating of the internal combustion engine.

[0011] The solenoid valve 2 a case 4 on, in which an electromagnetic circuit 6is provided for, which essentially consists of a coil carrier 8 wound coil 10 , an anchor 12 , a core 14 and a backflow preventer 16 consists of the coil. 10 This can be done in the usual way via an electrical plug 17 it may be connected to a motor control unit (not shown). The backflow preventer 16 consists in a known manner of a backplate 18 and a yoke not shown in this view. The anchor 12 a valve rod closes 20 on, which are adjustable in the anchor 12 It can be attached. Furthermore, it is a sleeve body. 22 provided for, which has a valve interior 24 opposite the electromagnetic circuit 6 seals to prevent contamination of the fluid to be regulated or controlled from parts of the electromagnetic circuit. 6can damage. In the present embodiment, the anchor 12 movable within the shell body 22 guided, which for this purpose has a non-magnetic coating. It should be clear that many other embodiments for an armature guide in the solenoid valve are within the scope of the invention. Thus, the armature can 12 it may also be guided via a sliding bearing bushing, with the anchor 12 The anchor can be guided either from the outside or via an internal pin. The anchor can also be positioned above the core. 14 be arranged, with the valve stem then 20 at its core 14 is mounted in a sliding bearing bushing.

[0012] Through a spring 26 is the anchor 12 opposite the core 14 pre-tensioned in such a way that the solenoid valve 2 via a locking element 28It performs a closed, de-energized setting. The locking element 28 is attached to the valve stem in a known manner 20 planned.

[0013] In the present embodiment, the core 14 a fitting 30 on, which fits into a corresponding recess 32 of the anchor 12 is movable. The surfaces facing each other 34 , 36 of the attachment 30 and the recess 32 are designed conically and have a taper angle α relative to a parallel to the longitudinal axis. 38 of the solenoid valve 2 from 8° to (see in particular Fig. 2) However, it is also conceivable that the attachment piece 30 and the corresponding recess 32 are cylindrical in design.

[0014] How Fig. 2 clearly shows that such a formation of the core will result 14 and the anchor12 a core effective area 38 , which here is formed as a core end face, and an anchoring surface 40 , which here is designed as an anchor bond surface. These effective surfaces 38 , 40 are primarily determined by magnetic field lines for the transition and thus for the force transmission from the core 14 to the anchor 12 used. According to the invention, it is now provided that the size ratio of the anchor effective area 40 to core effective area 38 The ratio lies between (0.8 and 1.2):1. Advantageously, this ratio is 1:1, as also shown here. When calculating the core effective area 38 , i.e., the core end face, must be the area of ​​a borehole 42 , in which the spring 26 in the assembled state of the solenoid valve 2 is arranged, of course, to be subtracted. The core effective area 38 It is therefore calculated according to the formula π × r k12 – π × r k2 2 and the anchoring surface 40 is calculated according to the formula π × r a1 2 – π × r a2 2 .

[0015] Fig. Figure 3 now shows the course of the magnetic force acting on the anchor. 12 It works via the valve lift. The solid line 44 shows the course of the magnetic force of the solenoid valve according to the invention. 2 with an area ratio of 1:1. The dashed line 46 This shows the magnetic force curve when the area ratio is 1:1.5. The significantly higher, constant magnetic force over most of the stroke is clearly visible. Only at a small distance from the armature is the magnetic force reduced. 12 to core 14 The solenoid valve according to the invention has 2a lower magnetic force, which, however, offers advantages in terms of control in that the magnetic force is almost constant over the entire stroke range and can therefore be controlled more precisely. QUOTES INCLUDED IN THE DESCRIPTION

[0016] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0017] DE 102010010187 B4

[0002] DE 102012101634 A1

[0002]

Claims

[1] Solenoid valve with an electromagnetic circuit ( 6 ), which consists of a coil carrier ( 8 ) wound coil ( 10 ), an anchor ( 12 ), a core ( 14 ) and a feedback device ( 16 ) consists of the anchor ( 12 ) one to the core ( 14 ) has a directed effective contour that is in electromagnetic active connection with an effective contour of the core ( 14 ) is positioned such that the anchor ( 12 ) a connecting piece ( 30 ) shows that there is a recess ( 32 ) of the core ( 14 ) is movable or vice versa, wherein an anchoring surface ( 40 ) and a core effective area ( 38 ) are planned, characterized by that the size ratio of anchor effective area ( 40 ) to core effective area ( 38 ) lies between (0.8 to 1.2):

1. [2] Solenoid valve according to claim 1, characterized bythat the size ratio of anchor effective area ( 40 ) to core effective area 38 The ratio is 1:

1. [3] Solenoid valve according to claim 1 or 2, characterized by that the mutually facing surfaces of the attachment piece ( 30 ) and the recess ( 32 are cylindrical in shape. [4] Solenoid valve according to claim 1 or 2, characterized by that the mutually facing surfaces of the attachment piece ( 30 ) and the recess ( 32 ) are conically shaped in relation to each other. [5] Solenoid valve according to claim 4, characterized by that a conicity angle α with respect to the longitudinal axis is between 3° and 13°, preferably 8°.

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