Abstract: A pumping system comprising a liquid ring vacuum pump including a casing and a rotatable runner. A Pitot pump including a casing, a Pitot tube, an impeller and a drum, the impeller and the drum being rotatably mounted in the casing, and the Pitot tube being mounted within the casing adjacent the outer periphery thereof. A gas passage leads into the vacuum pump, from the vacuum pump into the Pitot pump, and out of said Pitot pump, and a liquid passage leads from the Pitot tube to the vacuum pump. The system further includes a cooler connected to the liquid passage for cooling liquid therein, and a drive motor coupled to rotate the runner, the impeller and the drum.

Abstract: A capacity control arrangement controlling the capacity of a variable capacity wobble plate type compressor of a car air-conditioner driven by an engine of the car employs an engine load sensor, a compressor discharge pressure sensor, a car speed sensor, a compressor crankcase chamber pressure sensor, a miscellaneous air-conditioning data sensor, and a central processing unit to calculate and adjust a duty ratio value at which a solenoid-operated capacity control valve of the compressor is electrically driven. The adjustment of the duty ratio is carried out in such a manner when the engine load exceeds a predetermined value, the solenoid-operated capacity control valve first takes a fully open position to establish the lowest compressor capacity for an adjusted short period of time, and subsequently, takes a reduced opening position to maintain the lowest compressor capacity for as long as the engine load exceeds the predetermined value.

Abstract: A two-stage pumping apparatus is provided with a pump housing through which gross movement of material occurs generally from an infeed opening to a discharge opening. A first stage non-positive displacement helical flight auger is provided in a first stage region above, and coaxial with, one of a pair of second stage augers each having a positive displacement helical flight for engaging the material and for being respectively intermeshed to provide positive displacement pumping.

Abstract: A lubrication pump with a stroking action of a delivery piston and with regulatable metering of the amount of lubricant delivered with each stroke of the pump, wherein the delivery piston is actuated by the pump and aspirates the lubricant into a suction space whose volume is adjustable, wherein furthermore the lubrication is fed from the suction space through an intermediate storage space to the lubricant outlet or to the lubrication circulation circuit and wherein a check valve is provided in the above-mentioned delivery path of the lubricant, so that, when viewed in the delivery direction of the lubricant, the check valve is located following the receiving space and upstream of the intermediate storage space.

Abstract: A rotary lobed rotor pump has externally adjustable wearplates in the rotor casing juxtaposed to the parallel ends of rotating lobed rotors. Resilient members such as Belleville springs are adjusted by compression by means external of the rotor casing so that the springs move the wearplate(s) into a design clearance with the parallel rotor ends. No pump disassembly is required to accurately set the clearance. An internal pressure surge by-pass is provided which permits outward movement of either or both wearplates resulting in an increased gap with the rotor ends causing a decrease in the rate of rise in fluid pressure in the internal rotor casing cavities in effect causing rotor slippage.

Abstract: In a compressor having a plurality of banks of cylinders, smaller steps of unloading are achieved by unloading a single cylinder in a bank. When only one cylinder is to be unloaded, gas bypass is used in order to maintain a closer balance of forces in the bank. When the entire bank is unloaded, it is preferably done via the suction cutoff method.

Abstract: A rotating piston machine has a casing 2 with a shaft 5 borne in the casing 2. In an annular space 1 there are arranged rotating elements which bear in sealing manner against the walls of the annular space 1. Each rotating element (3, 4) has four outwardly extending sector-shaped vanes (3a-3d, 4a-4d). The two rotating elements (3, 4) are arranged coaxially; their vanes (3a-3d, 4a-4d) engage in one another, so that in each case one vane of the one rotating element is arranged between two vanes of the other rotating element. By a cam track control it is achieved that, on rotation of the shaft 5, both rotating elements execute rotations with cyclic changes in the speed of rotation and the distances between the vanes (3a-3d, 4a-4d). The cam track control has in this case for each rotating element eight rolling elements which interact with an inner and an outer curved track non-positively and free from play.

Abstract: A neutral centering mechanism (15) is disclosed of the type which may be used with a variable pump (11) of the type including a control shaft (33) rotatable about its axis of rotation (35) from a neutral position to first and second operating positions (FIGS. 12 and 13). A control handle (61) is rotatably fixed to the control shaft. The centering mechanism includes a stop plate (41) defining a fixed stop surface (43) and a spring plate (49) which is rotatable about the axis of rotation and defines a movable stop surface (79) in engagement with the handle (61) in the neutral position. The stop plate includes an adjustment screw (45) which adjusts the rotational position of the spring plate to a position in which the movable stop surface is disposed for neutral centering of the control handle and control shaft. A spring (59) biases the handle toward the movable stop surface, when the handle is rotated away from neutral to a first operating position.

Abstract: For controlling the internal volume of a rotary compressor (5), adjustable valve bodies (3) are used on the outlet side. External control means, often of an extremely complicated nature, have previously been used to control the internal volume in the rotary compressor. By allowing the different pressure levels of the rotary compressor (5) to directly influence a control section (1), the position of the valve body (3) can be controlled by an operating section (2). In the control section (1) an intermediate pressure (9) from the compressor is balanced against a pressure from the high-pressure side (19) of the compressor by a plunger (6) having different diameters. The position of the plunger (6) then determines the control of the internal volume by the position of the valve body (3) connected to the operating section (2).

Abstract: In a refrigerant gas compressor wherein a refrigerant gas compressed in a cylinder bore is discharged out therefrom into a discharge chamber through a discharge port, there is provided a plurality of attenuating cavities in the discharge chamber each located in such facing relation to the discharge port that the refrigerant gas discharged through said discharge port is introduced into said cavity.

Abstract: A precompression metering pump of the prior art which is otherwise particularly advantageous, is nevertheless difficult to prime because of the high degree of compressibility of the air it initially contains in its pump chamber. The present invention improves this aspect of metering pump operations. It consists in providing additional resilient means (20) and at least one cylindrical part (10) level with the conventional outlet non-return valve of the pump and constituting a second outlet non-return valve. In a particular embodiment, the resilient means and the cylindrical part are received one above the other in the outlet channel (33) of the pump actuator rod (31). To do this, they bear respectively against a choking step (32) in the form of a lug and a shoulder (34) presented by said channel. In normal operation, the differential piston (4) of the pump moves out of the way so that operation takes place as in a prior art precompression metering pump.

Abstract: A hydraulic single piston pump for manual operation has a piston (3) with a first channel (14, 20) running from piston chamber (7) to the rod chamber (5). The first channel has a check valve (15-19) opening in the return stroke. The piston (3) also has at least one second channel (22, 23, 25) running from the piston chamber (7) to the rod chamber (5). The second channel is configured as a choke bore (23, 25) along at least a part of its length.

Abstract: A plunger type pump for use with heavy oil or oil mixed with sand is set forth. It incorporates bottom and top cylinders which are joined at a central bushing. A standing check valve in a polished tube enlargement at the top end cooperates with a bottom check valve in the bottom cylinder. A safety joint on the sucker rod string is included for easy connection. Another feature is a top end sleeve connected with a pin and J-slot arrangement held to a surrounding sleeve. Two sleeves are separated by breaking shear pins axial movement, rotation in a particular direction and additional axial movement to accomplish J-slot disengagement.

Abstract: Leak detecting device working on the counter current principle uses a test piece connected to the inlet of a first turbomolecular pump, a gas detector connected to the inlet of a second turbomolecular pump. First and second molecular pumps downstream of the respective turbomolecular pumps have a common outlet connected to a pre-vacuum pump and reduce the effect of test gas substratum. Both turbomolecular and other molecular pumps are on a common shaft, the passages between each turbomolecular and molecular pumping stage being connected.

Abstract: An arrangement reduces friction between the sliding vane and rolling piston of a rotary compressor. In particular, a roller is built into a cavity at the tip of the vane. The roller provides rolling contact with the rolling piston so as to minimize friction between the vane tip and the rolling piston. An oil feed hole is provided in the cavity so as to feed oil onto the roller and, by way of the roller, to the external surface of the rolling piston. The reduction in friction reduces heat and, thereby reduces oil degradation. The result is less noise and less likelihood of mechanical breakdown.

Abstract: A large slide valve member concentrically mounts a small slide valve member or slide stop at one end thereof proximate to a helical screw rotary compressor discharge port with the small and large slide valve members movable as a unit for varying the built in volume ratio of the compressor. The small slide valve member is shiftable independently of the large slide valve member to vary the capacity of the machine. A large diameter cylinder fixedly mounted to the end of the compressor casing remote from an outlet port slidably mounts interiorly a smaller diameter cylinder fixed to the large slide valve via a spindle. The small slide valve is fixed to one end of a piston rod which extends through a bore within the large slide valve member and the spindle and terminates internally of the small diameter sliding inner cylinder and has fixed thereto a piston.

Abstract: In a low side hermetic compressor, a small portion of the compressed refrigerant gas is diverted and discharged into the oil sump through an orifice into the upper level of the oil in the sump. This results in a supersaturated solution of refrigerant in oil in the upper level which drives the refrigerant out of the oil, thereby creating froth which provides sound reduction without disturbing the lower level which remains stratified. A check valve is provided for preventing reverse flow while requiring a predetermined pressure differential for diversion.

Abstract: A gear pump in which a drive shaft is telescoped into a bore in a spur gear and is held against rotation relative to the gear by means of a key fitting into keyways formed in the shaft and in the bore of the gear. To retain the shaft against axial movement relative to the gear, a spring steel ring is formed with a radially extending slot having a transverse width just slightly greater than the transverse width of the key. The ring is collapsed hoopwise into a groove in the shaft and is positioned such that the slot in the ring is alined axially with the keyway in the shaft. When the shaft is telescoped to a predetermined depth in the bore in the gear, the ring expands hoopwise and snaps into a groove formed in the wall of the bore. The coaction of the ring with the two grooves locks the shaft against axial movement relative to the gear.

Abstract: A disposble centrifugal pump has two parts. One part includes a blood pumping chamber and a driven impeller, while the second part includes an impeller drive to which the impeller is coupled by mechanical shaft couplings. Two seals are provided to limit exposure of the fluid being pumped to possible contaminants. The first seal provides an effective shaft seal around the impeller shaft as it leaves the pumping chamber. The second seal provides an effective seal about all outer portions of the shaft when the shaft is coupled to the impeller drive to limit migration of possible contaminants along the shaft and into the pumping chamber.

Abstract: An improved, fluid driven rotary motor of the vane type includes a housing having a rotor cover disposed between a pair of end plates, a rotor rotatably mounted in the housing and a drive shaft torsionally affixed to the rotor. In the improved rotary motor of the invention, the rotor is slidable on the drive shaft so that the axial position of the rotor is permitted to "float" with respect to the housing. The degree of axial displacement, or degree of "float", is limited by a compression spring means and an abutting ring which cooperate with a pair of bearings in the end plates so that contact between the rotor and housing is avoided. Furthermore, the compression spring means is operative to force the rotor to return to a predetermined normal operating position upon axial displacement of the rotor.