摘要:
The invention concerns design of thermoelastic actuators incorporating an expansive element formed from material selected in accordance with a procedure involving the derivation of an indicator of the material's potential effectiveness for each application. Indicator ε is derived from: εη=Eη2T/ςC where E is Young's modulus of the material, η is coefficient of thermal expansion, T is maximum operating temperature, ς is density and C is specific heat capacity. Elements may be selected from a group including: borides, carbides, nitrides or silicides of chromium, molybdenum, niobium, tantalum, titanium, tungsten, vanadium or zirconium.
摘要:
Lubrication deficiencies related to the use of synthetic lubricants such as POE oils in refrigeration compressors can be mitigated by providing a diamond-like-carbon coating on a member subject to wear due to lubrication deficiencies. Specifically, the tip of the vane of a rotary compressor is coated with a diamond-like-carbon coating made up of alternating layers of tungsten carbide and a lubricious material 0.5 to 5.0 microns thick.
摘要:
Ein hydrodynamisches Gleitlager für einen Läufer einer Pumpe, insbesondere eine Magnetkupplungspumpe, das als kombiniertes Axial- und Radiallager ausgebildet ist, ist so gestaltet, daß jederzeit ausreichend Schmierung durch das zu fördernde Medium in das Gleitlager gelangt. Hierfür besteht das Gleitlager (1) im wesentlichen aus mindestens zwei Lagerhülsen (2, 3), aus mindestens ebenso vielen auf den Lagerhülsen (2, 3) gleitbaren und dadurch Gleitflächen (6, 7) bildenden Lagerbüchsen (4, 5), aus mindestens einer zwischen den jeweiligen Lagerhülsen (2, 3) angeordneten Distanzhülse (8) und aus mindestens einer zwischen den jeweiligen Lagerbüchsen (4, 5) angeordneten Distanzbüchse (9).
摘要:
A fluorine-containing benzophenone derivative of the formula (1), (2) or (3):
Φ¹ (-X¹-Q¹-R f ¹) n (1)
Φ²-X²-Q²-R f ²-Q³-X³-Φ³ (2)
Φ⁴-X⁴-Q f -X⁵-Φ⁵ (3)
wherein Φ¹ is a 2-hydroxybenzophenone structure of the formula ka-1:
(wherein Y is a hydrogen atom or a hydroxyl group, each of k and m indicates the number of bond sites, k is an integer of from 0 to 3, and m is an integer of from 0 to 3, provided that 1≦(k+m)≦4 ), n corresponds to (k+m) and is an integer of from 1 to 4, each of Φ², Φ³, Φ⁴ and Φ⁵ is a 2-hydroxybenzophenone structure of the formula ka-1 wherein (k+m) is 1, each of X¹, X², X³, X⁴ and X⁵ is a single bond or an oxygen atom, Q¹ is a single bond or a bivalent linking group having a carbon atom directly bonded to X¹, each of Q² and Q³ is a single bond or a bivalent linking group, R f ¹ is a monovalent polyfluorohydrocarbon group having from 2 to 22 carbon atoms, in which some of the carbon atoms may be substituted by ether oxygen atoms, R f ² is a bivalent polyfluorohydrocarbon group having from 2 to 22 carbon atoms, in which some of the carbon atoms may be substituted by ether oxygen atoms, and Q f is a bivalent linking group having at least one Q⁴-R f ¹ (wherein Q⁴ is a bivalent linking group, and R f ¹ is as defined above).
摘要:
A high-pressure piston pump for feeding fuel to an internal combustion engine, in particular a diesel engine, is provided with a pump housing (2); at least a piston (6) reciprocated in a cylinder (3); a roller (12) for reciprocating the piston (6); and a fuel suction valve (7) to selectively let in low-pressure fuel from a fuel feeding duct (4) in the cylinder (3) and isolate the cylinder (3) from the fuel feeding duct (4) when the piston (6) is in the compression stage; the suction valve (7) having a valve plate (21) and a valve shutter (22), which cyclically impacts on the valve plate (21) and is made of a material selected in the group of the cemented carbides.
摘要:
Disclosed is a MEMS device which comprises at least one shape memory material (110, 210, 310, 410, 510, 610, 710, 810, 910, 1030, 1120, 1230) such as a shape memory alloy (SMA) layer and at least one stressed material layer (120, 220, 320, 420, 520, 620, 720, 820, 920, 1050, 1130, 1240). Examples of such MEMS devices include an actuator, a micropump, a microvalve, or a non-destructive fuse-type connection probe. The device exhibits a variety of improved properties, for example, large deformation ability and high energy density. Also provided is a method of easily fabricating the MEMS device in the form of a cantilever-type or diaphragm-type structure.
摘要:
The invention concerns design of thermoelastic actuators incorporating an expansive element formed from material selected in accordance with a procedure involving the derivation of an indicator of the material's potential effectiveness for each application. Indicator ε is derived from: εη=Eη2T/ςC where E is Young's modulus of the material, η is coefficient of thermal expansion, T is maximum operating temperature, ς is density and C is specific heat capacity. Elements may be selected from a group including: borides, carbides, nitrides or silicides of chromium, molybdenum, niobium, tantalum, titanium, tungsten, vanadium or zirconium.
摘要:
Disclosed is a MEMS device which comprises at least one shape memory material (110, 210, 310, 410, 510, 610, 710, 810, 910, 1030, 1120, 1230) such as a shape memory alloy (SMA) layer and at least one stressed material layer (120, 220, 320, 420, 520, 620, 720, 820, 920, 1050, 1130, 1240). Examples of such MEMS devices include an actuator, a micropump, a microvalve, or a non-destructive fuse-type connection probe. The device exhibits a variety of improved properties, for example, large deformation ability and high energy density. Also provided is a method of easily fabricating the MEMS device in the form of a cantilever-type or diaphragm-type structure.