Connection adapter with an electromechanical actuator

Abstract

Connection adapter (2) with an electromechanical actuator (1) in operative connection with a pilot valve or a valve (18) for pressure change, wherein the electromechanical actuator (1) has an axis (14) whose rotational movement is directed towards a translational position change of a pressure piece (19) with a spring preload, characterized in that the connection adapter (2) has an upper connection surface (5) for connection with different electromechanical actuators (1), wherein a lower parallel connection surface (6) is formed at a distance from the connection surface (5) by a spacer body (11), within the spacer body (11) a closed guide dome (12) is formed, into which the axis (14) of the electromechanical actuator (1) dips and is axially guided by the pressure piece (19) and is in operative connection with it, wherein the axis (14) has at least one surface on its circumference,which engages in a corresponding recess of the pressure piece (19), wherein the pressure piece (19) has an external thread which interacts with an internal threaded bore (8) located within the guide dome (12) to change the relative position of the pressure piece (19).

Description

[0001] The invention relates to a connection adapter with an electromechanical actuating device for operative connection with a pilot valve or directly with a pressure-variable valve, wherein the electromechanical actuating device has an axis whose rotary movement is directed towards a translational position change of a pressure piece with a spring preload.

[0002] From DE10 2009 017 260 A1, an electronically controlled valve for fuel pressure regulation in injection systems is known. The electronically controlled valve is equipped with a motor to whose motor shaft a gear is attached, which engages with an output gear on the threaded shaft. This threaded shaft presses against the thrust bearing of the upper pressure plate. The stepper motor is connected to the housing cover via a motor mount.

[0003] German patent application DE 10 2018 127 283 A1 describes a rotor device, in particular a stepper motor rotor device, with at least one rotor assembly fixed in a hollow body. The rotor assembly comprises at least one rotor element, which is designed to convert a change in the magnetic field into a rotational movement of the rotor element, a bearing element, which is designed to provide rotational support for the rotor element, and at least one fixing element, which is designed to fix the rotor assembly within the hollow body. It is proposed that the bearing element be arranged in the hollow body such that axial forces acting in the direction of the rotor element and / or at least two axial forces acting in opposite directions, pulling and pushing, can be transmitted via the bearing element.

[0004] DE 40 11 593 C2 discloses an adjustable pressure valve which has a valve spring housed in a valve housing, which is supported on one side by a first valve plate for acting on a valve body and on the other side by a second valve plate which is movable relative to the first valve plate with the aid of a stepper motor, the stepper motor being coaxially flanged to the valve housing and having a continuous shaft which engages with the threaded spindle onto which an axially guided threaded nut is screwed for supporting the second valve plate, and the reaction force applied by the valve spring to the threaded spindle is introduced into a housing-fixed component via an axial bearing.

[0005] DE 76 04 336 U discloses a valve device with a valve tappet performing a lifting movement, which is driven by an actuator attached to the valve. The actuator has an electrically driven motor whose direction of rotation is reversible, and a gearbox that converts the direction of rotation is arranged between the motor drive shaft and the valve tappet.

[0006] EP 3 133 323 A1 comprises a pilot valve assembly including a pilot valve device, a pilot valve element, and a pilot valve seat interacting with the pilot valve element, as well as a presetting mechanism for presetting an opening pressure of the pilot valve element. The pilot valve assembly further comprises a presetting mechanism activation device including an actuating element adapted to generate an actuating force to actuate the presetting mechanism in the pilot valve assembly to preset the opening pressure. The new valve assembly is provided with a non-contact coupling arrangement suitable for changing the actuating force of the presetting device of the actuating device of the pilot valve device.

[0007] DE 195 04 886 C2 also includes an adjustable pressure valve with a valve body guided in a valve housing, which is preloaded by a valve spring towards a valve seat, which is supported on a spring plate, the relative position of which to the valve body can be changed to adjust the spring preload by means of an adjusting device of the spindle which engages with the spring plate.

[0008] The object of the invention is to adapt a motor, in particular a stepper motor, to a wide variety of valve designs in a cost-effective manner.

[0009] The problem is solved by the features of claim 1. The dependent claims following the main claim describe a further embodiment of the inventive concept.

[0010] To provide a connection adapter for a wide variety of pressure-variable valves or pilot valves, it is necessary that the adapter be designed to simultaneously accommodate different types of electromechanical actuators, such as DC motors or stepper motors. For this purpose, the adapter has a flat upper connection surface with a parallel lower connection surface. Slots or recesses are provided within both the upper and lower connection surfaces, into which screw elements can be inserted to allow for the attachment of the electromechanical actuator and also for mounting on control valves of various designs. Preferably, the upper connection surface includes a centering recess into which the electromechanical actuator, in the form of a DC motor or stepper motor, is inserted.Within the connection adapter, that is, between the upper and lower connection surfaces, a closed spacer body is formed, containing a closed guide dome. An axis of the electromechanical actuator extends into this guide dome. This armature axis has at least one flat surface. The axis engages in a complementary opening in a pressure piece. The pressure piece has a thread on its outer circumference, preferably a fine thread, which engages with a threaded bore within the guide dome. Thus, a rotational movement of the armature axis changes the position of the pressure piece translationally via the threaded section within the guide dome.

[0011] In another preferred embodiment, the axis can also be provided with a thread on its circumference, which interacts with an internal thread contained in the pressure piece in such a way that the laterally guided pressure piece performs a change in position.

[0012] The underside of the pressure piece rests on a compression spring, the other end of which rests on a pressure plate.

[0013] These design principles make it possible to directly adjust the pressure of a pilot valve or other regulators by changing the position of the pressure piece and the resulting change in spring preload. This allows, for example, the design of pressure reducing valves that are pilot-operated via a pilot valve, with the pressure setting being continuously variable via the stepper motor in the form of the electromechanical actuator.

[0014] The invention is explained in more detail below using a possible embodiment as an example. Fig. 1 a perspective view of a connection adapter with an electromechanical actuator arranged on the top and a connection on the bottom, for example to a pilot valve or a pressure reducing valve; Fig. 2 the connection adapter in a perspective single playback; Fig. 3 a section through the connection adapter and the electromechanical actuator; Fig. 4 A complete representation of a pressure reducing valve with flanged pilot valve and the connection adapter with the actuator.

[0015] The Fig. Figure 1 shows a connection adapter 2 in an installed position. The connection adapter 2 is located above a valve or pilot valve 3 and is connected to the pilot valve 3 via fastening screws 4. An electromechanical actuator 1, in the form of a motor, preferably a stepper motor, is shown on an upper connection surface 5 above the connection adapter 2. The electromechanical actuator 1 is connected to the connection adapter 2 via elongated holes 9 located in the upper connection surface 5 (connecting means not shown).

[0016] The connection adapter 2 is shown in a perspective view in the Fig. 2 is shown as a single component. The connection adapter 2 essentially consists of the upper connection surface 5 and a lower connection surface 6 arranged parallel to it. The upper connection surface 5 is spaced from the lower connection surface 6 by spacers 11. A centering receptacle 7 for the electromechanical actuator 1 is recessed in the upper connection surface 5. A closed guide dome 12 extends from the centering receptacle 7 over the height of the connection adapter 2. A threaded bore 8 is located within the guide dome 12.

[0017] To illustrate the operating principle of the electromechanical actuator 1, reference is made to the Fig. Figure 3, which shows a sectional view through the guide dome 12 and the electromechanical actuator 1, is referenced. A projection of the electromechanical actuator 1 is recessed within the centering receptacle 7, ensuring a precise fit for the electromechanical actuator 1. A threaded bore 8 in the guide dome 12 does not extend to the end of the lower part of the guide dome 12, but rather to a stop 20. The threaded bore 8 is preferably designed with a fine thread to allow for very precise adjustment of the pilot valve 3 or other directly connected valve or control units. The thread of the threaded bore 8 engages with an external thread of a pressure piece 19, the relative position of which can be changed by the electromechanical actuator 1.To change the position of the pressure piece 19 within the threaded bore 8, an axle 14 engages in a complementary recess of the pressure piece 19. The axle 14 has at least one surface on its outer diameter. This allows the pressure piece 19 to change position within the guide dome 12 when the axle 14 rotates, due to the at least one surface engaging in an opening (not shown) within the pressure piece 19. The underside of the pressure piece 19 rests on one end of a compression spring 13. The other end of the compression spring 13 rests either directly or indirectly, via a spring retainer 15, on a pressure plate 16. This pressure plate 16, in conjunction with components (not shown) of a pilot valve 3 or other regulators, for example, enables very precise, stepless pressure changes at the outlet of a valve 18.

[0018] Through the Fig. Figure 4 shows an exemplary assembly of the connection adapter 2 on a pilot valve 3 with the valve 18 located below it. The electromechanical actuator 1, in the form of a servo motor or the like, is located above the connection adapter 2.

[0019] The connection adapter (2) and the electromechanical actuator (1) can be covered together with a hood. Reference sign 1 Electromechanical actuator 2 connection adapters 3 pilot valve 4 mounting screws 5 Upper connection surface 6 Lower connection surface 7 Centering mount 8 threaded holes 9 elongated holes 11 spacers 12 Leadership Dome 13 Compression spring 14 axle 15 spring plates 16 printing plate 18 valve 19 printed piece 20 attacks

Claims

[1] Connection adapter (2) with an electromechanical actuating device (1) in operative connection with a pilot valve or a valve (18) for pressure change, wherein the electromechanical actuating device (1) has an axis (14) whose rotary movement is directed to a translational position change of a pressure piece (19) with a spring preload, characterized by, that the connection adapter (2) has an upper connection surface (5) for connection with different electromechanical actuators (1), wherein a lower parallel connection surface (6) is formed at a distance from the connection surface (5) by a spacer body (11), within the spacer body (11) a closed guide dome (12) is formed, into which the axis (14) of the electromechanical actuator (1) dips and is axially guided by the pressure piece (19) and is in operative connection with it, wherein the axis (14) has at least one surface on its circumference which engages in a corresponding recess of the pressure piece (19), wherein the pressure piece (19) has an external thread which cooperates with an internal threaded bore (8) located within the guide dome (12) for the relative position change of the pressure piece (19). [2] Connection adapter according to claim 1, characterized by, that the spring preload of the pressure piece (19) is generated by a compression spring (13) arranged below the pressure piece (19), wherein the compression spring (13) is positioned against a pressure plate (16) at the other end. [3] Connection adapter according to claim 2, characterized by , that a spring plate (15) is arranged between the pressure plate (16) and the end of the compression spring (13). [4] Connection adapter according to claim 1, characterized by , that laterally open elongated holes (9) and / or elongated holes (10) are formed in the upper connection surface (5) and in the lower connection surface (6), as well as in the spacer bodies (11). [5] Connection adapter according to claim 1, characterized by , that a centering receptacle (7) for the electromechanical adjusting device (1) is formed in the upper connection surface (5). [6] Connection adapter according to one or more of the preceding claims, characterized by, that the electromechanical actuator (1) is designed as a DC motor or as a stepper motor. [7] Connection adapter according to claim 1, characterized by , that the connection adapter (2) is made of light metal. [8] Connection adapter according to one or more of the preceding claims, characterized by , that the connection adapter (2) and the electrical actuator (1) are covered by a hood.

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