摘要:
In a refrigeration system, a centrifugal economizer discharges liquid towards an evaporator through a wholly static restriction (17), the dimension of which is chosen so as to allow no gas or little gas to escape with the liquid at the conditions of maximum pressure ratio in permanent operation. When the pressure ratio is lower, the flow rate allowed by the restriction tends to decrease with respect to the flow rate delivered by the compressor. This entails an increase in the radial thickness of the liquid ring in the centrifugal device. This in turn increases the pressure upstream of the restriction, whereby compensating the initial tendency of the flow rate to decrease through the restriction.
摘要:
A screw compressor discharges a fluid including a mixture of highly compressed gas and liquid into a separator reservoir, and a hydraulic motor is driven by at least a portion of the fluid. An injection conduit connects the bottom of the reservoir to a liquid injection port through the casing of the compressor. A pump driven by the hydraulic motor is mounted on the injection conduit. The motor-pump assembly is in a common casing. The injection port is in an area of the casing which is substantially subjected to high pressure.
摘要:
A volumetric machine comprises a cylindrical screw meshing with a pinion-wheel, a low pressure port near one end of the screw, a high pressure port near the other end of the screw, and a control slide axially movable in the bore of a housing in which the screw is rotatable. In one condition, including a series of positions, the slide more or less broadens the high pressure port and thus controls the volumetric ratio of the machine, but covers any threads of the screw which are meshing with the pinion-wheel. In another condition, the slide closes the high pressure port except a stationary port but uncovers some of the threads meshing with the screw, such as to establish a part load with a predetermined volumetric ratio.
摘要:
Refrigerant liquid containing a little oil dissolved is vaporized while cooling the motor and a portion of the vaporization products is sent into the bearings to be lubricated.The large excess of available heat permits dispensing with an oil recirculating pump and keeping in the motor casing, acting as a sump, the major part of the oil present.
摘要:
A screw is adapted to cooperate with a casing and at least one pinion-wheel for compressing or expanding a fluid within the space located between two screw threads, the casing and a tooth of the pinion-wheel. The casing and the crests of the threads carry two cooperating surfaces, and at least part of one of the surfaces comprises lands defining continuity of the surface but being discontinued along any circle centered on the axis of the screw. The lands separate cells which trap formative seizure particles and, thus, reduce the clearance needed between the screw and the casing.
摘要:
A process to supercharge and control a compressor comprising a single screw co-operating with at least two pinions in order to constitute as many partial compressors as there are pinions, such partial compressors operating in parallel and one of them at least being provided with a delivery control device, wherein the supercharging flow is injected into only one of the partial compressors and the delivery of the compressor is controlled from maximal delivery by reducing at first the deliveries of those partial compressors into which the supercharging flow is not injected.
摘要:
The method of energy conversion consists in burning a fuel in an oxidizing gas in order to admit the combustion gases into an expansion machine for delivering mechanical energy, in previously compressing the oxidizing gas in a positive-displacement compressor driven by the expansion machine, in injecting into the compressor a sealing and/or lubricating auxiliary liquid which is continuously cooled and separated from the compressed gas, then re-injected into the compressor. The auxiliary liquid is cooled by vaporization of water and the steam produced is entrained in the stream of compressed oxidizing gas.
摘要:
Process and system to produce nearly oil free ammonia using a rotary compressor with liquid injection from a separator tank where the liquid in the tank includes oil and liquid ammonia. The level of oil in the compressed ammonia leaving the separator is much lower than in conventional separators with coalescing elements, because the temperature is lower and there is less oil departure in oil vapor form.
摘要:
A machine for the compression or expansion of a fluid comprising a multi-thread screw having opposite low and high pressure ends, the screw being mountable for rotation about an axis to cooperate in substantially fluid-tight manner in a cylindrical bore of a stationary casing, at least one pinion having teeth disposed for meshing engagement with the screw threads and rotatable about an axis transverse with respect to the axis of screw rotation. The screw is carried by a shaft supported by two sets of bearings respectively disposed on each end of the screw. The casing bore is open at both ends and the high pressure end of the casing includes a hoop having an internal bore diameter substantially smaller than the diameter of the bore. The low pressure end of the casing bore is of a diameter at least equal to the diameter of the screw for introduction of the screw into the casing bore during assembly of the screw and casing.
摘要:
A screw (1) rotates inside a bore (2a) of a casing and meshes with teeth (6) of a pinion or gate-rotor (7) comprised of a sealing portion (8) supported by a support portion (9). The sealing portion (8) has a limited angular play with respect to the support portion (9). This allows the sealing portion to undergo brief but abrupt accelerations or decelerations independently of the support portion (9). In order to allow frictionless angular displacement between the two portions liquid is injected between them at a moderate pressure when each tooth is out of engagement with the screw.