摘要:
An refrigerant accumulator (18) comprises a first chamber (30), a second chamber (32), a pre-evaporator line (34), a post-evaporator-inlet line (36), and a post-evaporator-outlet line (38). The chambers (30, 32) are in a pressure-isolated arrangement and a heat-transfer relationship. The pre-evaporator line (34) passes through and communicates with the first chamber (30). In a steady state, the pressure of fluid in the first chamber (30) is greater than the pressure of fluid in the second chamber (32), but their temperatures are the same, and the pressure of fluid within the first chamber is balanced with the pressure of fluid within the pre-evaporator line. In a starved or flooded state, temperature differentials between the chamber (30) and chamber (32), and pressure imbalances between the chamber (30) and the pre-evaporator line (34), adjust the charge of refrigerant fluid to return the system to a steady state.
摘要:
N,N-Dialkylpolyhydroxyalkylamines may be made by the reductive alkylation of an N-alkylpolyhydroxyalkylamine with an aldehyde or ketone, or with an equivalent compound, in the presence of a transition metal catalyst and hydrogen. The reaction is performed in a reaction solvent that contains at least 30 wt % of an organic solvent. The use of a sufficiently high proportion of an appropriate organic solvent in the reaction mixture reduces the amount of water present in the reaction mixture, and provides rapid reaction rates and high yields of the desired product. The N,N-dialkylpolyhydroxyalkylamines may be used in a wide variety of applications.
摘要:
A control mechanism for a powered running board on an automotive vehicle, such as a sport utility vehicle, utilizes the memory function of the vehicle to store therein established operating positions for the running board. The user or occupant of the vehicle can manually position the powered running board to a convenient operating position within a range of available operating positions on the vehicle. By storing the selected position of the running board in the memory function of the vehicle, the control mechanism can return to that same operating height each time the occupant seeks to use the running board for entry or exit of the vehicle. The control mechanism is operable with different configurations of running boards and with different power devices for effecting the movement of the running board.
摘要:
A method for protecting pump components by coating moving components with an amorphous carbon material. Components that preferably receive such coating include the plunger, barrel, travelling valve ball and seat, and standing valve ball and seat. Other components may also be coated. The coating thickness is preferably in the range of between about 0.0002″ and 0.0008″.
摘要:
An apparatus to assist an operator in loading a bicycle onto a substantially vertical bicycle rack attached to an automotive vehicle, includes a base that attaches to the upper portion of the bicycle rack, and a substantially U-shaped hook, having one end that pivots at its base end and having another end that engages the inner rim portion of bicycle wheel when the bicycle is lifted into the proximity of the upper portion of the bicycle rack. The present apparatus and method of loading of a bicycle assists an operator in loading a bicycle by fully supporting the weight of the bicycle while the operator positions and secures the bicycle to the bicycle rack for transport.
摘要:
A combined USB flash drive cap audio device is provided. In at least one embodiment, a thumb drive cap includes: a portable housing defined as a USB cap for a portable USB storage thumb drive; a female USB connector interface defined within the portable housing and configured to receive and electronically couple to a male USB connector on the portable USB storage thumb drive; a control unit disposed within the portable housing and configured to enable audio playback through the thumb drive cap of audio data stored on the connected portable USB storage thumb drive; and a plurality of user interface buttons disposed upon the portable housing and through which the thumb drive cap is controlled by a user for audio playback and audio record.
摘要:
A vehicle roof rack assembly comprises a pair of rails defining retention channels therein. A locking slot is disposed on an inboard surface of the rails and is in communication with the retention channels. The rook rack assembly further comprises a crossbar having a rotatable locking cam with retention tabs. The locking cam is designed to frictionally engage the locking slot during rotation and the retention tabs are adapted to extend into the retention channels, thereby securing the crossbar to the rails.
摘要:
There is provided a seat assembly for use in a downhole oil pump ball valve. The assembly includes a seat, a seat rest, and a ball. The seat is used for seating the ball of the ball valve. The seat has an outer wall and a top surface and a curved shoulder surface between the outer wall and the top surface. The seat rest receives the seat, and the seat rest has a curved corner surface so that when the seat is assembled with the seat rest the seat and seat rest are in substantial contact at all points of the curved shoulder surface and the curved corner surface.
摘要:
Compounds according to formula (I) wherein Z is S, SO, or SO2, may be prepared by a process that includes charging to a reactor hydrogen sulfide and an alkyl glycidyl ether according to formula (III), in the presence of a base. The compounds may also be prepared by contacting an alkoxychlorohydrin according to formula (II) with a sulfide source.
摘要:
Compounds having N-oxide, quaternary ammonium, and/or betaine functionality according to formulas (1)-(4) are effective corrosion inhibitors, suitable for use in any of a variety of applications such as automotive cooling systems, heating boilers, drilling of oil wells, and the handling, transportation and storage of crude petroleum and various petroleum fractions. The groups R1-R5 may be certain hydrocarbyl groups. In formulas (1) and (3), R3 may also be (CH2)p—COO− in which p is either 1 or 2, and R2 may also be (CH2)p—COO− in formulas (3) and (4). In the compounds of formulas (1) and (2), R2 may also be a polyhydroxyalkyl group of formula (A), shown below.