US20040163462A1 - Slosh supressor and heat sink - Google Patents
Slosh supressor and heat sink Download PDFInfo
- Publication number
- US20040163462A1 US20040163462A1 US10/371,535 US37153503A US2004163462A1 US 20040163462 A1 US20040163462 A1 US 20040163462A1 US 37153503 A US37153503 A US 37153503A US 2004163462 A1 US2004163462 A1 US 2004163462A1
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- United States
- Prior art keywords
- module
- gel layer
- silicon gel
- circuit
- sensor
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 72
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 72
- 239000010703 silicon Substances 0.000 claims abstract description 72
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 9
- 230000033001 locomotion Effects 0.000 description 7
- 238000005070 sampling Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/10—Preventing damage by freezing or excess pressure or insufficient pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/006—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus characterised by the use of a particular material, e.g. anti-corrosive material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates generally to electronic devices having a circuit module which is covered by a layer of silicon gel for environmental protection, and more particularly relates to a mass flow air sensor utilized to measure the air intake of an automobile engine and the protection of the sensor's circuit module.
- One type of mass flow air sensor includes a housing that projects into the main air intake tube of the engine for sampling the intake air and generating a signal representative of the instantaneous mass fluid flow through the passage.
- the housing defines a circuit chamber having a circuit module positioned therein.
- the circuit module includes various electronic components and wire bonds linked to those components for generating the air flow signal that is sent to the electronic engine control system.
- the circuit module is covered by a silicon gel layer to protect the circuit module from the environment.
- the circuit chamber is closed by a housing cover.
- the present invention provides a slosh suppressor for preventing damage to electronic components and the wire bonds contained inside the housing of an electronic device such as a sensor, and most preferably a mass air flow sensor.
- the slosh suppressor is formed into a sensor module comprising a sensor housing defining a circuit chamber.
- a circuit module is positioned within the circuit chamber and has a silicon gel layer positioned thereon for protecting the circuit module from the environment.
- a housing cover is structured to engage the sensor housing and close the circuit chamber.
- the housing cover has a projection extending into the circuit chamber and engaging the silicon gel layer to reduce vibrational displacement of the silicon gel layer and protect the circuit module.
- the projection extends into the silicon gel layer, and preferably extends only partially into the silicon gel layer.
- the projection divides the silicon gel layer into multiple sections and inhibits the transfer of vibrational energy between sections of the silicon gel layer.
- the separation of the silicon gel layer into separate mass sections increases a resonant frequency in each section and reduces the movement of the silicon gel layer when the sensor module is subject to vibration.
- the housing cover includes a plurality of projections extending into the circuit chamber and engaging the silicon gel layer to reduce vibrational displacement.
- the plurality of projections do not intersect or otherwise are arranged to prevent trapped air within the circuit chamber between the silicon gel layer and the housing cover.
- the projections are positioned adjacent the wire bonds and the electronic components to provide small mass sections of silicon gel layer proximate the wire bonds. The smaller the mass section, the higher the resonant frequency giving smaller motions in the mass section.
- the housing cover may include a plurality of fins on its outer surface which promote heat transfer from the circuit module through the cover.
- FIG. 1 is a perspective view of a sensor module constructed in accordance with the teachings of the present invention
- FIG. 2 is an enlarged, partially cut-away, view of the sensor module shown in FIG. 1 having a circuit module positioned therein;
- FIG. 3 is a perspective view, taken from the bottom, of a housing cover for use with the sensor module shown in FIG. 1
- FIG. 4 is a perspective view, taken from the top, of a housing cover shown in FIG. 3;
- FIG. 5 is a cross sectional view of a sensor module and circuit module taken about the line 5 - 5 in FIG. 2;
- FIG. 6 is a cross-sectional view similar to FIG. 5, but showing the silicon gel layer positioned on the circuit module;
- FIG. 7 is a perspective view, taken from the bottom, of an alternate embodiment of the housing cover.
- FIG. 8 is a perspective view, taken from the top, of the housing cover shown in FIG. 7.
- FIG. 1 depicts a perspective view of a sensor module 20 which employs the slosh suppressor of the present invention.
- the sensor module 20 has been depicted as a mass air flow sensor for use with the air intake passageway of an automobile engine, although it will be recognized that other electronic devices may employ the present invention, such as a pressure module, an engine control module, a brake module, or any device having a circuit module covered with a gel layer.
- the sensor module 20 shown in FIG. 1 generally comprises a connector portion 24 , a circuit portion 26 , and a fluid sampling portion 28 .
- the connector portion 24 and fluid sampling portion 28 will not be described in detail herein, but their details can be found in co-pending application numbers Ser. No. 10/126810 and 10/267281 which are hereby incorporated by reference in their entirety.
- the sensor module 20 generally includes a sensor housing 22 which defines the three portions 24 , 26 , 28 of the module.
- the sensor housing 22 generally defines a circuit chamber 30 formed within the circuit portion 26 of the housing 22 .
- the circuit chamber 30 includes an electronics cover 36 which is attached to the housing 22 , typically by an adhesive.
- the electronics cover 36 is preferably made of a metal material to provide a heat sink for a circuit module 40 (FIG. 2) that is attached to the electronics cover 36 .
- the circuit module 40 is adhesively attached directly to the electronics cover 36 , which is then positioned on the sensor housing 22 and adhesively attached thereto.
- the circuit chamber 30 further includes a first plurality of bonding pads 32 and a second plurality of bonding pads 34 at opposing ends of the chamber.
- the bonding pads 32 are utilized to link the connector portion 24 to the circuit module 40 .
- the bonding pads 34 are utilized to connect the various components of the fluid sampling portion 28 to the circuit module 40 .
- the circuit module 40 is positioned within the circuit chamber 30 defined by the sensor housing 22 .
- the circuit module 40 senses fluid, such as air flowing through a passage, by receiving signals from the fluid sampling portion 28 .
- the circuit module 40 may be a single integrated circuit chip, or a substrate having discrete, as well as integrated circuits, mounted thereon.
- the circuit module 40 is a circuit board having discrete electronic components 42 mounted thereon.
- the components 42 are in turn connected to other components, as well as to the bonding pads 32 and 34 .
- one of the components 42 is attached to a ground pad 46 for connection to the grounding plane.
- each of these electric connections are accomplished by way of a wire bond which includes a wire 44 appropriately bonded, typically by welding, to the components 42 , bonding pads 32 , 34 , and grounding pad 46 . That is, the wires 44 are utilized to form wire bonds between the various electronic components 42 , bonding pads 32 , 34 , and grounding pad 46 .
- the circuit chamber 30 is typically filled with a silicon gel layer 66 (FIG. 6) placed on top of the circuit module 40 , including on top of the electronic components 42 , and wire bonds formed with the wires 44 and bonding pads 32 , 34 and grounding pad 46 .
- the silicon gel layer 66 is typically two-five millimeters thick, and provides environmental protection (i.e., from water, dust or other debris) to the circuit module 40 .
- vibration of the vehicle including the air intake passage, causes vibration in the sensor module 22 , which in turn causes the silicon gel layer 66 to vibrate.
- the present invention provides a slosh suppressor which inhibits the vibration in the silicon gel layer 66 and which also provides a path for conduction of heat away from the circuit module 40 providing for cooler electronics.
- FIG. 3 a perspective view, taken from the bottom, is shown of a housing cover 50 which is utilized with the sensor module 22 .
- the housing cover 50 is sized to be received within the circuit portion 26 , and more particularly the circuit chamber 30 of the housing 22 .
- the housing cover 50 includes a bottom surface 52 which has a tongue 62 projecting downwardly therefrom around the outer periphery of the cover 50 .
- the circuit chamber 30 defines a ledge 46 for receiving the cover 50 , and the ledge 46 includes a groove 48 for receiving the tongue 62 of the cover 50 .
- the cover 50 includes at least one, and preferably a plurality of projections extending downwardly from the bottom surface 52 for engaging the silicon gel layer. As shown in FIG. 3, the cover 50 includes projections 56 positioned adjacent opposing corners of the cover 50 , as well as elongated projections 58 positioned adjacent the center of the cover 50 , and a central projection 60 positioned at the center of the cover 50 .
- the projections 56 , 58 , 60 can take virtually any shape or form, and are preferably arranged to be positioned adjacent the electronic components and wire bonds of the circuit module 40 , but not directly above the same. As shown in FIG. 3, the projections 56 , 58 , 60 are symmetrically spaced so that the cover 50 can be placed on the housing 22 to cover the chamber 30 without worrying about orientation.
- FIG. 4 A perspective view of the cover 50 is shown in FIG. 4, but taken from the top to show a top surface 54 .
- a plurality of fins 62 of varying size are positioned on the top surface 54 of the cover 50 .
- the fins 62 provide a structure for promoting heat transfer from the circuit module 40 through to the fluid passing by the sensor module 20 .
- the cover 50 is attached to the housing 22 in a manner to close the circuit chamber 30 .
- the cover 50 includes tongue 62 which fits in groove 48 formed in the ledge 46 of the housing.
- the bottom of the circuit chamber 30 is closed by the electronics cover 36 which is adhesively attached to a bottom surface of the housing 22 .
- the electronics cover 36 also includes a tongue for utilization with a groove formed in the housing 22 .
- the electronics cover 36 positions a circuit module 40 within the circuit chamber 30 .
- the circuit module 40 includes various electronic components 42 which are interconnected and connected to bonding pads 32 , 34 by wires 44 to form the various wire bonds.
- the projections 58 , 60 of the housing cover 50 project downwardly into the chamber 30 .
- FIG. 6 the same cross-sectional view of FIG. 5 has been shown, wherever a silicon gel layer 66 has been depicted.
- the silicon gel layer 66 is typically in liquid form and dispensed over the circuit module 40 to provide environmental protection to the same.
- the liquid silicon gel 66 is cured, typically by some heat, into a gelatinous matter of the final product.
- the projections 58 , 60 extend downwardly and engage the silicon gel layer 66 .
- the projections 58 , 60 extend into the silicon gel layer to break up the same. That is, the projections divide the silicon gel layer 66 into different sections, whereby the projections 58 , 60 inhibit the transfer of vibrational energy between the sections of the silicon gel layer 66 .
- the projections 58 , 60 engage the silicon gel layer 66 to increase the resident frequency and reduce movement of the silicon gel layer when the sensor module 20 is subject to vibration. This occurs because the silicon gel layer 66 is divided into smaller mass sections which vibrate at a higher frequency, but a smaller distance.
- the projections 58 , 60 are integrally formed with the cover 50 , which are all constructed of a polymer, preferably a nylon hybrid polymer.
- the projections 58 , 60 are preferably more rigid than the silicon gel layer 66 .
- the plurality of projections 58 , 60 do not intersect and thus do not create any chambers for trapping air.
- a layer of air extends between the silicon gel layer 66 and the bottom surface 52 of the cover 50 . Trapped air can expand due to changes in temperature, which can cause problems with the sensor module 20 . Similarly, air bubbles may be contained within the silicon gel layer 66 which need to escape. Accordingly, air circulation is promoted and the circuit chamber 30 is vented to the atmosphere.
- the projections are arranged to facilitate air circulation and do not provide any unvented or trapped areas of air.
- the projections 58 , 60 are three to five millimeters in height and extend into the silicon gel layer as much as possible. Ideally, the projections are not positioned directly above the electronic components 421 or the wire bonds formed by wires 44 , but rather are positioned adjacent to these structures so that the mass sections of the silicon gel layer 66 in those areas are very small to reduce the movement by increasing the resident frequency in those mass sections.
- the various projections on the cover 50 can be sized, arranged and coordinated to correspond to any particular circuit module 40 and its particular configuration.
- the projections go into the silicon gel layer 66 as much as possible, typically about one to two millimeters. This is sufficient to break up the silicon gel layer 66 into different mass sections and inhibit the transfer of vibrational energy between the sections.
- the housing cover 70 again includes a tongue 71 for engaging the groove 48 in the circuit chamber 30 .
- the housing cover 70 includes a lower surface 72 having a plurality of projections 75 extending downwardly therefrom.
- the projections 75 are angularly spaced and extend radially from a center point to form a star shape.
- Each of the projections 75 includes an engagement surface 76 which is tapered. That is, the downward surfaces 76 of the projections 75 are tapered to define a edge 78 .
- the engagement edge 78 is utilized to pierce the silicon gel layer 66 when the cover 70 is attached to the housing 22 .
- each projection 75 is tapered so that none of the inner ends 80 are in contact. As in the previous embodiment, that is to facilitate air circulation between the cover 70 and the silicon gel layer 66 , and prevent any trapped air within the circuit chamber 30 .
- the cover 70 includes an upper surface 74 having a plurality of fins 82 positioned thereon.
- the fins 82 are also tapered and are utilized to promote heat transfer through the cover 70 . That is, heat from the circuit module 40 flows through the silicon gel layer 66 to the projections 75 , which in turn flow through the body of the cover 70 and are convected through the fins 82 by way of the air or other fluids flowing through the passage in which the sensor module 20 is positioned.
- the projections 75 are positioned to fit within an open area in the chamber which is not directly above the electronic components 42 or wire bonds formed by the wires 44 and bonding pads 32 , 34 , 46 . Nonetheless, the projections 75 break up the silicon gel layer 66 in the areas adjacent the wire bonds and electronic components 42 in order to decrease the mass sections in those areas and provide less vibrational movement by virtue of increased resident frequency.
- the slosh suppessor of the present invention protects the electronic components 42 and wire bonds formed by the wires 44 by breaking up the silicon gel layer 66 into smaller mass regions and thus reducing its inertial effects on the same. Furthermore, the projections extending into the silicon gel layer provide a conduction path for heat transfer which can then be convected through the housing cover, and preferably utilizing fins on the cover's outer surface. The air or other fluid flow around the outer surface of the sensor module 20 allows convection of the heat from the cooling fins on the outer surface of the cover.
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Pressure Sensors (AREA)
Abstract
Description
- The present invention relates generally to electronic devices having a circuit module which is covered by a layer of silicon gel for environmental protection, and more particularly relates to a mass flow air sensor utilized to measure the air intake of an automobile engine and the protection of the sensor's circuit module.
- The prior art teaches the importance of measuring air intake into an internal combustion engine for purposes of improving engine control. One type of mass flow air sensor includes a housing that projects into the main air intake tube of the engine for sampling the intake air and generating a signal representative of the instantaneous mass fluid flow through the passage. The housing defines a circuit chamber having a circuit module positioned therein. The circuit module includes various electronic components and wire bonds linked to those components for generating the air flow signal that is sent to the electronic engine control system. Typically, the circuit module is covered by a silicon gel layer to protect the circuit module from the environment. Finally, the circuit chamber is closed by a housing cover.
- It has been found that the silicon gel layer in the circuit chamber shows large motions or vibrations which are induced by vehicle vibration. Unfortunately, these large vibrations or motions in the silicon gel can cause premature fracturing of the circuit components or wire bonds. Accordingly, there exists a need to provide a sensor having an electronic component that is well protected from the environment, provides good heat transfer, and which can withstand the vibrations on the sensor from the automobile environment.
- The present invention provides a slosh suppressor for preventing damage to electronic components and the wire bonds contained inside the housing of an electronic device such as a sensor, and most preferably a mass air flow sensor. Generally, the slosh suppressor is formed into a sensor module comprising a sensor housing defining a circuit chamber. A circuit module is positioned within the circuit chamber and has a silicon gel layer positioned thereon for protecting the circuit module from the environment. A housing cover is structured to engage the sensor housing and close the circuit chamber. The housing cover has a projection extending into the circuit chamber and engaging the silicon gel layer to reduce vibrational displacement of the silicon gel layer and protect the circuit module.
- The projection extends into the silicon gel layer, and preferably extends only partially into the silicon gel layer. The projection divides the silicon gel layer into multiple sections and inhibits the transfer of vibrational energy between sections of the silicon gel layer. The separation of the silicon gel layer into separate mass sections increases a resonant frequency in each section and reduces the movement of the silicon gel layer when the sensor module is subject to vibration.
- Preferably, the housing cover includes a plurality of projections extending into the circuit chamber and engaging the silicon gel layer to reduce vibrational displacement. Preferably the plurality of projections do not intersect or otherwise are arranged to prevent trapped air within the circuit chamber between the silicon gel layer and the housing cover. Most preferably, the projections are positioned adjacent the wire bonds and the electronic components to provide small mass sections of silicon gel layer proximate the wire bonds. The smaller the mass section, the higher the resonant frequency giving smaller motions in the mass section. Finally, the housing cover may include a plurality of fins on its outer surface which promote heat transfer from the circuit module through the cover.
- The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention, and together with the description serve to explain the principles of the invention. In the drawings.
- FIG. 1 is a perspective view of a sensor module constructed in accordance with the teachings of the present invention;
- FIG. 2 is an enlarged, partially cut-away, view of the sensor module shown in FIG. 1 having a circuit module positioned therein;
- FIG. 3 is a perspective view, taken from the bottom, of a housing cover for use with the sensor module shown in FIG. 1
- FIG. 4 is a perspective view, taken from the top, of a housing cover shown in FIG. 3;
- FIG. 5 is a cross sectional view of a sensor module and circuit module taken about the line5-5 in FIG. 2;
- FIG. 6 is a cross-sectional view similar to FIG. 5, but showing the silicon gel layer positioned on the circuit module;
- FIG. 7 is a perspective view, taken from the bottom, of an alternate embodiment of the housing cover; and
- FIG. 8 is a perspective view, taken from the top, of the housing cover shown in FIG. 7.
- Turning now to the figures, FIG. 1 depicts a perspective view of a
sensor module 20 which employs the slosh suppressor of the present invention. Thesensor module 20 has been depicted as a mass air flow sensor for use with the air intake passageway of an automobile engine, although it will be recognized that other electronic devices may employ the present invention, such as a pressure module, an engine control module, a brake module, or any device having a circuit module covered with a gel layer. Thesensor module 20 shown in FIG. 1 generally comprises aconnector portion 24, acircuit portion 26, and afluid sampling portion 28. Theconnector portion 24 andfluid sampling portion 28 will not be described in detail herein, but their details can be found in co-pending application numbers Ser. No. 10/126810 and 10/267281 which are hereby incorporated by reference in their entirety. - The
sensor module 20 generally includes asensor housing 22 which defines the threeportions sensor housing 22 generally defines acircuit chamber 30 formed within thecircuit portion 26 of thehousing 22. Thecircuit chamber 30 includes anelectronics cover 36 which is attached to thehousing 22, typically by an adhesive. Theelectronics cover 36 is preferably made of a metal material to provide a heat sink for a circuit module 40 (FIG. 2) that is attached to theelectronics cover 36. Typically, thecircuit module 40 is adhesively attached directly to theelectronics cover 36, which is then positioned on thesensor housing 22 and adhesively attached thereto. - The
circuit chamber 30 further includes a first plurality ofbonding pads 32 and a second plurality ofbonding pads 34 at opposing ends of the chamber. Generally, thebonding pads 32 are utilized to link theconnector portion 24 to thecircuit module 40. Likewise, thebonding pads 34 are utilized to connect the various components of thefluid sampling portion 28 to thecircuit module 40. - As shown in the enlarged view of FIG. 2, the
circuit module 40 is positioned within thecircuit chamber 30 defined by thesensor housing 22. The circuit module 40 senses fluid, such as air flowing through a passage, by receiving signals from thefluid sampling portion 28. Thecircuit module 40 may be a single integrated circuit chip, or a substrate having discrete, as well as integrated circuits, mounted thereon. As shown in FIG. 2, thecircuit module 40 is a circuit board having discreteelectronic components 42 mounted thereon. Thecomponents 42 are in turn connected to other components, as well as to thebonding pads components 42 is attached to aground pad 46 for connection to the grounding plane. As can be seen, each of these electric connections are accomplished by way of a wire bond which includes awire 44 appropriately bonded, typically by welding, to thecomponents 42,bonding pads grounding pad 46. That is, thewires 44 are utilized to form wire bonds between the variouselectronic components 42,bonding pads grounding pad 46. - As was previously described, the
circuit chamber 30 is typically filled with a silicon gel layer 66 (FIG. 6) placed on top of thecircuit module 40, including on top of theelectronic components 42, and wire bonds formed with thewires 44 andbonding pads grounding pad 46. Thesilicon gel layer 66 is typically two-five millimeters thick, and provides environmental protection (i.e., from water, dust or other debris) to thecircuit module 40. Unfortunately, vibration of the vehicle, including the air intake passage, causes vibration in thesensor module 22, which in turn causes thesilicon gel layer 66 to vibrate. This vibration in thesilicon gel layer 66 can cause the wire bonds formed bywires 44 to prematurely break, and can also cause damage to theelectronic components 42 of thecircuit module 40. Accordingly, the present invention provides a slosh suppressor which inhibits the vibration in thesilicon gel layer 66 and which also provides a path for conduction of heat away from thecircuit module 40 providing for cooler electronics. - Turning now to FIG. 3, a perspective view, taken from the bottom, is shown of a
housing cover 50 which is utilized with thesensor module 22. Thehousing cover 50 is sized to be received within thecircuit portion 26, and more particularly thecircuit chamber 30 of thehousing 22. Thehousing cover 50 includes abottom surface 52 which has atongue 62 projecting downwardly therefrom around the outer periphery of thecover 50. Thecircuit chamber 30 defines aledge 46 for receiving thecover 50, and theledge 46 includes agroove 48 for receiving thetongue 62 of thecover 50. - The
cover 50 includes at least one, and preferably a plurality of projections extending downwardly from thebottom surface 52 for engaging the silicon gel layer. As shown in FIG. 3, thecover 50 includesprojections 56 positioned adjacent opposing corners of thecover 50, as well aselongated projections 58 positioned adjacent the center of thecover 50, and acentral projection 60 positioned at the center of thecover 50. Theprojections circuit module 40, but not directly above the same. As shown in FIG. 3, theprojections cover 50 can be placed on thehousing 22 to cover thechamber 30 without worrying about orientation. - A perspective view of the
cover 50 is shown in FIG. 4, but taken from the top to show atop surface 54. A plurality offins 62 of varying size are positioned on thetop surface 54 of thecover 50. Thefins 62 provide a structure for promoting heat transfer from thecircuit module 40 through to the fluid passing by thesensor module 20. - As best seen in the cross-sectional view of FIG. 5, the
cover 50 is attached to thehousing 22 in a manner to close thecircuit chamber 30. Thecover 50 includestongue 62 which fits ingroove 48 formed in theledge 46 of the housing. The bottom of thecircuit chamber 30 is closed by the electronics cover 36 which is adhesively attached to a bottom surface of thehousing 22. Preferably, the electronics cover 36 also includes a tongue for utilization with a groove formed in thehousing 22. The electronics cover 36 positions acircuit module 40 within thecircuit chamber 30. Thecircuit module 40 includes variouselectronic components 42 which are interconnected and connected tobonding pads wires 44 to form the various wire bonds. As can be seen, theprojections housing cover 50 project downwardly into thechamber 30. - Turning now to FIG. 6, the same cross-sectional view of FIG. 5 has been shown, wherever a
silicon gel layer 66 has been depicted. Thesilicon gel layer 66 is typically in liquid form and dispensed over thecircuit module 40 to provide environmental protection to the same. Theliquid silicon gel 66 is cured, typically by some heat, into a gelatinous matter of the final product. Theprojections silicon gel layer 66. As shown, theprojections silicon gel layer 66 into different sections, whereby theprojections silicon gel layer 66. Preferably, theprojections silicon gel layer 66 to increase the resident frequency and reduce movement of the silicon gel layer when thesensor module 20 is subject to vibration. This occurs because thesilicon gel layer 66 is divided into smaller mass sections which vibrate at a higher frequency, but a smaller distance. Theprojections cover 50, which are all constructed of a polymer, preferably a nylon hybrid polymer. Theprojections silicon gel layer 66. - Preferably, the plurality of
projections silicon gel layer 66 and thebottom surface 52 of thecover 50. Trapped air can expand due to changes in temperature, which can cause problems with thesensor module 20. Similarly, air bubbles may be contained within thesilicon gel layer 66 which need to escape. Accordingly, air circulation is promoted and thecircuit chamber 30 is vented to the atmosphere. To accomplish the above, the projections are arranged to facilitate air circulation and do not provide any unvented or trapped areas of air. - Preferably, the
projections wires 44, but rather are positioned adjacent to these structures so that the mass sections of thesilicon gel layer 66 in those areas are very small to reduce the movement by increasing the resident frequency in those mass sections. The various projections on thecover 50 can be sized, arranged and coordinated to correspond to anyparticular circuit module 40 and its particular configuration. Preferably, the projections go into thesilicon gel layer 66 as much as possible, typically about one to two millimeters. This is sufficient to break up thesilicon gel layer 66 into different mass sections and inhibit the transfer of vibrational energy between the sections. - Turning now to FIGS. 7 and 8, an alternate embodiment of the
housing cover 70 has been depicted. In this embodiment, thehousing cover 70 again includes atongue 71 for engaging thegroove 48 in thecircuit chamber 30. Thehousing cover 70 includes alower surface 72 having a plurality ofprojections 75 extending downwardly therefrom. Theprojections 75 are angularly spaced and extend radially from a center point to form a star shape. Each of theprojections 75 includes anengagement surface 76 which is tapered. That is, the downward surfaces 76 of theprojections 75 are tapered to define aedge 78. Theengagement edge 78 is utilized to pierce thesilicon gel layer 66 when thecover 70 is attached to thehousing 22. It can also be seen that theinner end 80 of eachprojection 75 is tapered so that none of the inner ends 80 are in contact. As in the previous embodiment, that is to facilitate air circulation between thecover 70 and thesilicon gel layer 66, and prevent any trapped air within thecircuit chamber 30. - As shown in FIG. 8, the
cover 70 includes anupper surface 74 having a plurality offins 82 positioned thereon. Thefins 82 are also tapered and are utilized to promote heat transfer through thecover 70. That is, heat from thecircuit module 40 flows through thesilicon gel layer 66 to theprojections 75, which in turn flow through the body of thecover 70 and are convected through thefins 82 by way of the air or other fluids flowing through the passage in which thesensor module 20 is positioned. Theprojections 75 are positioned to fit within an open area in the chamber which is not directly above theelectronic components 42 or wire bonds formed by thewires 44 andbonding pads projections 75 break up thesilicon gel layer 66 in the areas adjacent the wire bonds andelectronic components 42 in order to decrease the mass sections in those areas and provide less vibrational movement by virtue of increased resident frequency. - Therefore, it can be seen that the slosh suppessor of the present invention protects the
electronic components 42 and wire bonds formed by thewires 44 by breaking up thesilicon gel layer 66 into smaller mass regions and thus reducing its inertial effects on the same. Furthermore, the projections extending into the silicon gel layer provide a conduction path for heat transfer which can then be convected through the housing cover, and preferably utilizing fins on the cover's outer surface. The air or other fluid flow around the outer surface of thesensor module 20 allows convection of the heat from the cooling fins on the outer surface of the cover. - The foregoing description of various embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Numerous modifications or variations are possible in light of the above teachings. The embodiments discussed were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.
Claims (23)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/371,535 US6782745B1 (en) | 2003-02-21 | 2003-02-21 | Slosh supressor and heat sink |
GB0402440A GB2400238B (en) | 2003-02-21 | 2004-02-04 | Slosh suppressor and heat sink |
DE102004008204A DE102004008204A1 (en) | 2003-02-21 | 2004-02-18 | Splash guard and heat sink |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/371,535 US6782745B1 (en) | 2003-02-21 | 2003-02-21 | Slosh supressor and heat sink |
Publications (2)
Publication Number | Publication Date |
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US20040163462A1 true US20040163462A1 (en) | 2004-08-26 |
US6782745B1 US6782745B1 (en) | 2004-08-31 |
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Family Applications (1)
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US10/371,535 Expired - Fee Related US6782745B1 (en) | 2003-02-21 | 2003-02-21 | Slosh supressor and heat sink |
Country Status (3)
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US (1) | US6782745B1 (en) |
DE (1) | DE102004008204A1 (en) |
GB (1) | GB2400238B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2083251A1 (en) * | 2007-12-13 | 2009-07-29 | Kamstrup A/S | A consumption meter with at least two casing parts |
US20110036162A1 (en) * | 2007-08-21 | 2011-02-17 | Belimo Holding Ag | Flow sensor and production method thereof |
EP1714820A3 (en) * | 2005-04-21 | 2011-08-17 | Nifco Inc. | Noise suppressing device and installation structure of same |
CN107878596A (en) * | 2016-09-30 | 2018-04-06 | 夏普株式会社 | Moving body |
CN108072413A (en) * | 2017-11-17 | 2018-05-25 | 安徽翼迈科技股份有限公司 | A kind of big table gauge outfit of passive photoelectric direct-reading |
WO2019102737A1 (en) * | 2017-11-27 | 2019-05-31 | 日立オートモティブシステムズ株式会社 | Flow rate meter |
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DE102005048396A1 (en) * | 2005-10-10 | 2007-04-19 | Siemens Ag | sensor assembly |
JP4857017B2 (en) * | 2006-04-27 | 2012-01-18 | 日立オートモティブシステムズ株式会社 | Power converter |
JP5052277B2 (en) * | 2007-09-26 | 2012-10-17 | ホシザキ電機株式会社 | Ice making water tank of automatic ice machine |
DE102009002853B4 (en) | 2009-05-06 | 2022-02-10 | Robert Bosch Gmbh | Device for detecting a parameter of a flowing fluid medium |
JP5351330B2 (en) * | 2010-10-05 | 2013-11-27 | 新日鐵住金株式会社 | Vehicle fuel tank |
CN109520326B (en) * | 2017-09-18 | 2024-05-28 | 美的集团股份有限公司 | Warmer |
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US3701540A (en) * | 1971-12-10 | 1972-10-31 | William L Pringle And Associat | Fuel tank assembly |
US4603733A (en) * | 1982-12-30 | 1986-08-05 | Richard Loevinger | Heated railroad tank car |
US4844278A (en) * | 1986-12-03 | 1989-07-04 | Daimler-Benz Aktiengesellschaft | Fuel tank for vehicles with fuel movement calmina arrangement |
US5311930A (en) * | 1992-11-17 | 1994-05-17 | Bruenn Paul R | Heat reclamation device |
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Cited By (10)
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EP1714820A3 (en) * | 2005-04-21 | 2011-08-17 | Nifco Inc. | Noise suppressing device and installation structure of same |
US20110036162A1 (en) * | 2007-08-21 | 2011-02-17 | Belimo Holding Ag | Flow sensor and production method thereof |
US8256285B2 (en) * | 2007-08-21 | 2012-09-04 | BELIMO Holding, AG | Flow sensor including a base member with a resilient region forming a flow channel and a cover member covering the flow channel |
EP2083251A1 (en) * | 2007-12-13 | 2009-07-29 | Kamstrup A/S | A consumption meter with at least two casing parts |
CN107878596A (en) * | 2016-09-30 | 2018-04-06 | 夏普株式会社 | Moving body |
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CN108072413A (en) * | 2017-11-17 | 2018-05-25 | 安徽翼迈科技股份有限公司 | A kind of big table gauge outfit of passive photoelectric direct-reading |
WO2019102737A1 (en) * | 2017-11-27 | 2019-05-31 | 日立オートモティブシステムズ株式会社 | Flow rate meter |
JP2019095387A (en) * | 2017-11-27 | 2019-06-20 | 日立オートモティブシステムズ株式会社 | Flowmeter |
CN111373226A (en) * | 2017-11-27 | 2020-07-03 | 日立汽车系统株式会社 | Flow meter |
Also Published As
Publication number | Publication date |
---|---|
DE102004008204A1 (en) | 2004-09-16 |
US6782745B1 (en) | 2004-08-31 |
GB2400238A (en) | 2004-10-06 |
GB2400238B (en) | 2005-03-16 |
GB0402440D0 (en) | 2004-03-10 |
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