Patent Application
20060081044
The present invention is generally related to liquid flow sensors. More particularly, the present invention is related to a device for accurately positioning and aligning a liquid flow tube with respect to a sensor.
Sensors, such as Surface Acoustic Wave (SAW) sensors, or thermal transfer sensors are used for many industrial and environmental applications. SAW sensors can be used to sense pressure, temperature, torque, humidity from various media such as liquid, vapor and gas. Sensors are useful for measuring/tracking fluid flow; however, the effectiveness of the fluid sensor is often dependent on its alignment along a sensor or within or a liquid flow tube with respect to an integrated sensor.
The present invention includes hardware that aligns liquid flow tubes for optional sensing and data acquisitions of fluid flowing therein through sensors which are integrated with the hardware used for aligning liquid flow tubes.
Accordingly, it is a feature of the present invention to provide a device for positioning a liquid flow tube with respect to a sensing element.
It is a feature of a preferred embodiment of the invention to provide for combined liquid flow tube alignment and liquid sensing system includes a flow tube mounting and alignment hardware including a clip for fastening the hardware to a substrate and a sensor integrated with the liquid flow tube mounting and alignment hardware. Fluid flowing through a flow tube mounted and aligned by the flow tube mounting and alignment hardware flows into the sensor integrated with the flow tube and the flow tube mounting and alignment hardware wherein the fluid is sensed by the sensor.
In accordance with another feature of the present invention the flow tube mounting and alignment hardware position a liquid flow tube in alignment with respect to a sensor.
In accordance with yet another feature of the present invention a flow tube mounting and alignment hardware are provided that include a clip with internal periphery edges sized to match the external periphery edges of at least one sensing element associated with the sensor.
In accordance with yet another feature of the present invention a combined tube mounting and alignment hardware further comprises at least two posts located at outer members of the clip above and below the tube. The posts are sized to be located ideally within a system to position and retain the outer diameter of liquid flow tube with respect to internal periphery edges of the clip and subsequently, the sensing element both horizontally and vertically.
In accordance with yet another feature of the present invention a center flexing member is provided in associated with the clip.
In accordance with yet another feature of the present invention a slot is included to accurately position/retain and apply a controlled force to an area of the tube located at the center of the sensing element.
The accompanying figures, in which like reference numerals refer to identical or functionally-similar elements throughout the separate views and which are incorporated in and form a part of the specification, further illustrate the present invention and, together with the detailed description of the invention, serve to explain the principles of the present invention.
The particular values and configurations discussed in these non-limiting examples can be varied and are cited merely to illustrate at least one embodiment of the present invention and are not intended to limit the scope of the invention.
It is a main feature of the present invention to provide a device for positioning a liquid flow tube with respect to a sensing element. Referring to
At least two posts 150 can be located on each of the outer members of the clip are sized and located in a manner that will position and retain the outer diameter of liquid flow tube 130 in alignment with respect to the internal periphery edges of the clip 140 and subsequently, the sensor 120, both horizontally and vertically. A center flexing member of the flow tube mounting and alignment hardware 145 can also have a slot 170 formed therein, wherein the slot 170 can accurately position/retain and apply a controlled force to the tube at the center of the sensing element 120.
The slot can also provide for ventilation/heat dissipation from area around the sensing element 120. The liquid flow tube alignment and liquid sensing system/device 100 includes wire bond pads 165 that are positioned in close proximity to the substrate's wire bond pads 160. Wire bonding between the pads on substrate and sensing element completes the electrical connection.
Referring to
The liquid flow tube alignment and liquid sensing system/device 100 can be affixed to the substrate with an adhesive. A liquid flow tube 130 is inserted into the liquid flow tube alignment and liquid sensing system/device 100 via the clip 145. The clip 145 is then positioned around the sensing element and bonded into place. The clip 145 can be initially open-ended in this insertion area to allow access to the flow tube for the initial assembly and operation.
Limited contact area between liquid flow tube 130 and clip 145 can decrease heat dissipation to the liquid being sensed. The flexible center member of the clip can be designed to hold the tube in contact with the die. Preferred embodiment has the flex member and slot 170 formed directly over the sense element on the clip 145. Alternate embodiment for the thermal sensor has two contact points on the flex member, adjacent either side of the sense element to reduce heat transfer (e.g., heat sinks).
The embodiments and examples set forth herein are presented to best explain the present invention and its practical application and to thereby enable those skilled in the art to make and utilize the invention. Those skilled in the art, however, will recognize that the foregoing description and examples have been presented for the purpose of illustration and example only. Other variations and modifications of the present invention will be apparent to those of skill in the art, and it is the intent of the appended claims that such variations and modifications be covered.
The description as set forth is not intended to be exhaustive or to limit the scope of the invention. Many modifications and variations are possible in light of the above teaching without departing from the scope of the following claims. It is contemplated that the use of the present invention can involve components having different characteristics. It is intended that the scope of the present invention be defined by the claims appended hereto, giving full cognizance to equivalents in all respects.
