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Bellows

About: Bellows is a research topic. Over the lifetime, 15312 publications have been published within this topic receiving 73914 citations.


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Patent
27 Sep 1976
TL;DR: In this paper, a pressure sensor for indicating pressure in the animal or human body, such as intracranial pressure, including a housing, a bellows contained within the housing, and a body pressure sensing tambour, is presented.
Abstract: A pressure sensor for indicating pressure in the animal or human body, such as intracranial pressure, including a housing, a bellows contained within the housing, a body pressure sensing tambour for placing the bellows in communication with pressure in the body so that the pressure will cause the bellows to move as a function of the pressure, output means, such as a radioactive source and associated shielding, contained within the housing and associated with the bellows for providing an output which is a function of the movement of the bellows, and a receiver, such as a radiation detector, located external to the body to receive the output and provide data indicative of the pressure in the body. The pressure sensor includes means associated with the bellows to enable in vivo calibration of the pressure sensor after implantation by establishing a preselected output condition during calibration. An ambient pressure sensing tambour is associated with the bellows for compensating for ambient pressure variations. The bellows is resilient, made of a material and shape which has 100% memory of elastic deformation and has a wall thickness of less than 0.001 inch, in order to provide an output which accurately reflects the pressure being monitored. The bellows has a spring rate which is substantially greater than the spring rate of the pressure sensing and ambient pressure compensating tambours thereby making the pressure sensor essentially insensitive to temperature variations.

31 citations

Patent
Fredrick W. Barrett1
28 Feb 1994
TL;DR: In this article, a perflourinated hydrocarbon liquid is used to transfer heat from the micro-bellows to the module package, and the microbellows are used to compensate for the compression and expansion characteristics of the perfloured liquid.
Abstract: The heat dissipation and mechanical stability of an electronic circuit module package (10) is enhanced by filling the module cavity (20) with a perflourinated hydrocarbon cooling liquid, and by placing a micro-bellows (24, 28) within the module cavity. The temperature compression and expansion characteristics of the perflourinated hydrocarbon liquid are compensated by the action of the micro-bellows. The module package contains semiconductor die (16, 18) that require cooling during operation. The perflourinated hydrocarbon liquid provides the necessary heat transfer to the module package.

31 citations

Patent
29 Jan 1976
TL;DR: In this article, an eliptical butterfly type damper is disposed diagonally in a cylindrical configuration and a small bellows supplied with air through a small conduit from the downstream side of an orifice member disposed in the main conduit upstream of the damper.
Abstract: A conduit with inlet and discharge ends respectively for receiving a supply of air under pressure and for delivering the air at a lower pressure has a cylindrical configuration and an eliptical butterfly type damper is disposed diagonally therein. The damper turns about an axis intermediate its diagonally opposite ends and the oncoming air stream thus impinges on the upstream face of the damper on opposite sides of the axis and creates a differential force, the said differential force tending to close the damper and constituting a first closing force. A second closing force for the damper is provided by a small bellows supplied with air through a small conduit from the downstream side of an orifice member disposed in the main conduit upstream of the damper. A second and substantially larger bellows serves to open the damper and a small conduit connects the said bellows with a controller supplied with air from an upstream side of the orifice member in the main conduit. The controller regulates pressure in the large bellows as determined by a pressure drop signal across the orifice member and a thermostat. The thermostat vents air from the controller to reduce large bellows pressure for damper closing operation and, conversely, the large bellows is pressurized to cause the butterfly damper to move in the opening direction.

31 citations

Patent
23 Dec 2009
TL;DR: In this article, the main filter element (36) is embodied in as a double bellows filter including a first radially inwardly positioned filter bellows (40) and a second radially outwardly positioned Filter Bellows (42) surrounding it.
Abstract: A filter device (10) for an internal combustion engine includes a separator that is embodied as a cyclone preseparator (26), a main filter element (36) exchangeably arranged in a housing compartment (68) of the filter housing (12), and a secondary filter element (38. The housing compartment (68) includes insertion stays (64). The main filter element (36) is embodied in as a double bellows filter including a first radially inwardly positioned filter bellows (40) and a second radially outwardly positioned filter bellows (42) surrounding it. Upon closing of a servicing housing cover (18) a sealing force is generated that acts onto the main filter element (36) and is maintained in the closed state of the servicing cover (18).

31 citations

Patent
23 Mar 1970
TL;DR: In this article, the authors propose to use a tubular heat exchanger with two paths through one of which refrigerant from a supply under pressure is supplied to a pressure reducing nozzle, whereupon the low pressure refrigerant returns through the other path, a valve member co-operating with the nozzle to vary its effective area for automatically controlling the flow of refrigerant.
Abstract: Cryogenic cooling apparatus includes a generally tubular heat exchanger affording two paths through one of which refrigerant from a supply under pressure is supplied to a pressure reducing nozzle, whereupon the low pressure refrigerant returns through the other path, a valve member co-operating with the nozzle to vary its effective area for automatically controlling the flow of refrigerant, and a bellows, connected to the valve to actuate it. To provide a compact construction without unduly reducing the size of the bellows the valve is situated outside the heat exchanger beyond its cold end and the bellows is outside the heat exchanger beyond its warm end, and is connected to the valve by a piston rod extending through the heat exchanger.

31 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202358
2022118
202194
2020195
2019344
2018614