This invention relates generally to control systems and assemblies and, more specifically, relates to controllers and systems using electronically controlled valves, electronically controlled valves, and portions thereof, as well as to assemblies that include at least one valve.
Control systems for electronically controlled valves are used with many different types of fluids and gases for many different purposes. While control systems, their controllers, and the associated electronically controlled valves have many benefits, these control systems, controllers, electronically controlled valves and portions thereof may still be improved.
An exemplary embodiment in accordance with this invention is a motor housing retainer that is a substrate composed of a dielectric material. The retaining element is configured to be affixed over a cavity in a valve body and prevents a motor housing from exiting the cavity in the valve body. Additionally the motor housing retainer provides one or more connection points for electrical connections.
In further exemplary embodiments, the motor housing retainer has an opening to allow access to the cavity. The motor housing retainer can be configured to fit within a recess on the valve body.
In additional exemplary embodiments, the motor housing retainer is a printed circuit board where at least two connectors are connected by a circuit on the printed circuit board.
In further exemplary embodiments, the motor housing retainer provides an electrical connection between the motor housing and the motor housing cover. The connection to the motor housing may be a Flexible Printed Circuit connector and uses a flat cable to connect to the voice coil. Such a connection may be used for coil current transfer.
Another exemplary embodiment in accordance with this invention is an electronically controlled valve. The valve includes a valve body with a cavity; a motor housing within the cavity; and a motor housing retainer. The retainer is a substrate composed of a dielectric material. The retaining element is configured to be affixed over a cavity in a valve body and prevents a motor housing from exiting the cavity in the valve body. Additionally the motor housing retainer provides one or more connection points for electrical connections.
In additional exemplary embodiments, the motor housing retainer has an opening to allow access to the cavity. The motor housing retainer can be configured to fit within a recess on the valve body.
In further exemplary embodiments, the motor housing retainer is a printed circuit board where at least two connectors are connected by a circuit on the printed circuit board.
In additional exemplary embodiments, the motor housing retainer provides an electrical connection between a voice coil, part of a coil header assembly, and a motor housing cover. The connection to the motor housing may be a Flexible Printed Circuit connector and uses a flat cable to connect to the voice coil. Such a connection may be used for coil current transfer.
A further exemplary embodiment in accordance with this invention is a valve retaining element. The element provides a means for preventing a motor housing from exiting a cavity in a valve body; and means for providing one or more electronic connections enabling coil current transfer.
In further exemplary embodiments, the valve retaining element provides an electrical connection between a voice coil, part of a coil header assembly, and a motor housing cover.
Another exemplary embodiment in accordance with this invention is a method which includes providing a valve body; inserting a spool actuator through an opening into a cavity within the valve body; and affixing a printed circuit board over the opening. The printed circuit board provides an electrical connection to the spool actuator and also mechanically preventing the spool actuator from passing through the opening.
The attached Drawing Figures include the following:
Referring to
The electronically controlled valve 120 controls fluid (e.g., gas, water, oil) flow 141 through the electronically controlled valve 120 by operating the spool 130. The spool actuator 125 controls movement of the spool 130 based on one or more control signals 116 from the spool position controller 115. The spool position controller 115 modifies the one or more control signals 116 based on the one or more input signals 111, which include addition of the control input signal 105 and the one or more feedback signals 151. The feedback sensor module 150 can monitor the spool actuator 120 (e.g., current through the spool actuator), a sensor indicating the position of the spool 130, or sensors indicating any number of other valve attributes (e.g., pressure or flow rate of the fluid flow 141). Aspects of the present invention are related to a number of the elements shown in
Turning to
In this example, a top surface 211 of the motor housing 210 contacts a bottom surface 208 of motor housing retainer 207 and is held in place by the motor housing retainer 207. In accordance with the exemplary embodiments of this invention, the motor housing retainer 207 is a PCB (printed circuit board). The motor housing retainer 207 serves multiple purposes, as is disclosed in more detail below. It should be appreciated that the motor housing retainer may be attached using a number of techniques, including using hardware such as screws; and sliding or snapping into place.
The spool 230 includes in this example a passage 265. The passage 265 has a number of purposes, including equalizing pressure between the upper cavity 215 and the lower cavity 216. The spool 230 may also be manufactured without passage 265.
As described below, the electronics cover 205 may include a connector 206 used to couple a spool position controller 115 to the voice coil 221 on voice coil portion 222. The electronics cover 205 is one example of a cover used herein.
A description of exemplary operation of the valve 200 is included in U.S. Pat. No. 5,960,831, which is hereby incorporated by reference in its entirety. U.S. Pat. No. 5,960,831 describes, for instance, airflow through the external ports 270, 271, 280, 281, and 283 and the circumferentially spaced internal ports 270a, 271a, 280a, 281a, and 283a. It is noted that the springs 240, 245 along with the coil header assembly 220, motor housing 210, and spool 230, are configured such that the spool 230 blocks the ports 281A when no power is applied to the voice coil 221. Other portions of pneumatic valve 200 are also described in U.S. Pat. No. 5,960,831.
In
Other possible approaches to solving this problem of retaining the motor housing 210 may employ the use of an adhesive, such as epoxy, or the use of hardware to secure the motor housing 210 to the body 290, manufacturing a cover plate that is attached with hardware, or by using a pressing or other bonding operation. However, each of these approaches adds additional parts and/or manufacturing steps to the assembly as well as making disassembly/maintenance more difficult. Another approach may be to thread the motor housing 210 (e.g., and a matching inner surface of the upper cavity 215 in the valve body 290). However, this approach would add additional cost to the assembly.
The use of the exemplary embodiments of this invention avoid these and other problems by using a PCB to serve at least three purposes 1) as a mechanical element, 2) as a spring contact plate for coil current transfer, and 3) as a connector location. As shown in
It is noted that the example described below specifically concerns retaining a spring loaded voice coil motor in a pneumatic valve. However, the techniques shown below are also applicable to retaining any mechanical element having static or dynamic forces thereon, and the use of the exemplary embodiments of this invention is not limited to retaining a spring loaded voice coil motor in a pneumatic valve.
Referring to
In order to retain the motor housing 210 in the upper cavity 215 of the body 290, the motor housing retainer 207 is attached to the body 290, show here attached with screws 1330a and 1330b, such as shown in
Turning to
The screening shown in
It should be appreciated that the PCB 207A could also accommodate other components such as integrated circuits, resistors, capacitors, etc., as is known in the art. Such components may be passive or may transform a signal passing through the component.
In general, the PCB 207A could be fabricated from any suitable substrate material, such as one or more layers of a glass-epoxy. In general, the thickness of the PCB 207A is made sufficient to resist any force applied to it by the motor housing 210 without experiencing undue deformation or bending. Depending on whether the motor housing 210 is electrically conductive, it may be desirable in some embodiments to include a layer or sheet of a electric material between the top of the motor housing 210 and the bottom of the PCB 207A, to prevent the shorting of electrical signal line.
The foregoing description has provided by way of exemplary and non-limiting examples a full and informative description of the best techniques presently contemplated by the inventors for carrying out embodiments of the invention. However, various modifications and adaptations may become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings and the appended claims. All such and similar modifications of the teachings of this invention will still fall within the scope of this invention.
Furthermore, some of the features of exemplary embodiments of this invention could be used to advantage without the corresponding use of other features. As such, the foregoing description should be considered as merely illustrative of the principles of embodiments of the present invention, and not in limitation thereof.
This patent application claims priority under 35 U.S.C. §119(e) from Provisional Patent Application No. 60/854,562, filed Oct. 25, 2006, the disclosure of which is incorporated by reference herein in its entirety.
Number | Date | Country | |
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60854562 | Oct 2006 | US |