摘要:
A lip seal device for sealing the gap between a housing and a rotary shaft comprises a case surrounding the rotary shaft, a lip seal attached inside the case a, support for holding the lip seal on the outer circumferential portion thereof and a seal located on the outside circumferential surface of the case. The inner circumferential portion of the lip seal is curved toward the sealed fluid. The lip seal includes a sealing surface provided with an annular groove extending continuously in the circumferential direction of the rotary shaft so that the sealing surface has a first and second sealing portion, the contact pressure of the first sealing portion on the rotary shaft being lower than the contact pressure of the second sealing portion on the rotary shaft.
摘要:
A non-contact type seal device for a turbocharger in which lubricating oil is prevented from leaking into the compression chamber of the turbocharger over the entire range of rotational speeds thereof. The seal device of the invention includes a retainer mounted in a compression chamber of a housing of the turbocharger, a collar attached to a compressor wheel mounting portion of the rotor shaft of the turbocharger, and a ring provided on an inner peripheral surface of the retainer. An annular groove receiving the ring is formed in the outer peripheral surface of the collar. A first gap is formed between the outer peripheral surface of the collar and the inner peripheral surface of the retainer, while a second gap is formed between the inner surface of the annular groove and each of the inner and outer end surfaces of the ring. A threaded groove is formed in the inner peripheral surface of the retainer in opposition to the outer peripheral surface of the collar.
摘要:
A cylindrical sliding bearing 1 can rotatably support a rotational shaft by a sliding surface 4 (inner circumferential surface). A crowning 5 having a sloped surface is formed at both ends of the sliding surface 4 in the axial direction. The crowning 5 includes a first crowning 3A formed of a sloped surface of a lining layer 3 and a second crowning 2A formed of a sloped surface of a back metal 2 positioned on the lower side of the first crowning. Unlike a conventional sliding bearing, the back metal 2 where the crowning 5 is positioned is provided as a sloped surface (2A). As compared with conventional bearings, the crowning 5 can be prevented from being unevenly brought into contact with the rotational shaft.
摘要:
A pyrrolesulfonamide compound having the following formula (I): wherein the ring P represented by is a pyrrole ring having the following structure: wherein A represents alkylene, alkenylene or alkynylene; and Y represents a group in which W represents CH, C═ or N; m stands for 0 or 1 when W is CH or N, or m stands for 1 when W is C═; B represents a specific divalent group; E1 and E2 each independently represents H or lower alkyl; and D represents an aromatic hydrocarbon group or heterocyclic group; l stands for 0 or 1; the dashed line indicates the presence or absence of a bond; and, when the bond is present, Z2 is not present and Z1 represents H but, when the bond is absent, Z1 represents H and Z2 represents OH or Z1 and Z2 are combined together to represent O or a group NOR5, in which R5 represents H, or alkyl, aralkyl or aryl; and R represents H, alkyl, cycloalkyl, cycloalkyl-alkyl or aralkyl. The compound (1) has been improved in potency, selectivity to receptors other than serotonin-2 receptors, toxicity, side effects and/or the like over medicines reported to date and equipped with &agr;1-blocking action and serotonin-2 receptor antagonistic action in combination.
摘要:
A thiopyran derivative represented by the following formula (I) or (I'), or the salt thereof. ##STR1## wherein A is S or --CH.dbd.CH--; the dotted line indicates that the bond may be either present or absent; Z and Z' are typically ##STR2## L is an ethylene or trimethylene group; Y is CH or N; n is 2; B is a carbonyl group; m is 0 or 1; D is a phenyl group; and E.sub.1 and E.sub.2 are hydrogen atoms. These compounds exhibit a strong serotonin-2 blocking action and highly safe. Some compounds also exhibit an .alpha..sub.1 -blocking action and therefore are useful as an antihypertensive agent with less side effects. Thus, the thiopyran derivatives are useful as drugs for the treatment of circulatory diseases in general such as hypertension, ischemic heart disease, cerebrovascular disturbance, and peripheral circulatory disturbance.
摘要:
An ink jet recording apparatus includes a recording head having plural discharge openings for discharging ink, a liquid chamber for storing the ink to be supplied to the discharge openings, a liquid flow path for communicating the discharge openings with the liquid chamber, and plural energy generating elements for generating energy to be used for discharging the ink from the discharge openings. The head also includes a substrate having the energy generating elements provided thereon and a transfer molded structural member made of thermosetting resin. The structural member has a concave portion for forming a liquid flow path, and the structural member is fused to the substrate.
摘要:
A method for manufacture of an ink jet head comprises the process of forming a head main body by providing a positive resist layer to constitute ink passages for a substrate having ink ejection pressure generating means and then a ceiling member therewith; forming a carbon-contained film for the surface where the ink discharging ports of the head main body are formed; conducting a fluoric plasma treatment given to the carbon-contained film by utilizing a hydrofluoride compound; and removing the positive resist layer. With this method, an F-C coupled water repellent film is formed on the discharging port formation surface of an ink jet recording head evenly with a desirable bonding capability to enhance the reliability of water repellency.
摘要:
A method for driving a liquid-jet recorder having electric heaters for forming flying liquid droplets by jetting a liquid is characterized by applying no voltage to the electrodes of each electric heater for the moments the heater is not driven during the operation of the recorder.
摘要:
A liquid jet recording head is provided with a liquid discharging portion having an orifice provided to discharge liquid and form flying liquid droplets and a liquid flow path communicating with the orifice and having as a part of the construction thereof a heat-acting portion in which heat energy for forming the liquid droplets acts on the liquid. The heat acting portion includes electro-thermal converting element comprising a heat-generating resistive layer provided on a base plate and at least a pair of opposed electrodes between which a heat-generating portion is formed by the resistive layer, wherein the width of the electrodes in at least the portion thereof which is in contact with the heat-generating portion is greater than the width of the heat-generating resistive layer corresponding thereto.
摘要:
A lip seal device for sealing the gap between a housing and a rotary shaft comprises a case surrounding the rotary shaft, a plurality of lip seals fitted inside the case and including at least two lip seals, support means for holding the lip seals on the outer circumferential portions thereof and seal means located on the outside of the circumferential surface of the case. The inner circumferential portions of the lip seals are curved toward the sealed fluid and have a sealing surface in contact with the outside circumferential surface of the rotary shaft. The contact pressure of the lip seal furthest from the sealed fluid is lower than the contact pressure of the lip seal closest to the sealed fluid.