4594results about "Rotary piston pumps" patented technology

An example gear pump includes a pump housing having a pump housing channel and an arcuate groove disposed in an interior surface of the pump housing; a pump ring gear disposed within the pump housing and rotatable relative to the pump housing; a pump pinion disposed within the pump ring gear, such that teeth of the pump pinion engage with internal teeth of the pump ring gear; and a pump port block having a first port and a second port, wherein as the pump pinion rotates within the pump ring gear, fluid is drawn through the first port and provided to the second port for discharge, wherein a portion of fluid being provided to the second port is provided to the pump housing channel, wherein fluid from the pump housing channel is provided to the arcuate groove to apply a radially-inward force on the pump ring gear.

The shutdown of a compressor (10) installed in a refrigerant circuit (2) in air conditioning or refrigeration system is controlled so as to prevent unpowered reverse rotation of the compressor. Prior to terminating electric power to the compressor drive motor (24), the pressure within the system is relieved and substantially equalized across the compressor, thereby eliminating the possibility of unpowered reverse rotation of the compressor at shutdown. Pressure relief and equalization may be achieved by reducing the operating speed of the compressor to a low forward speed for a period of time prior to deenergizing the compressor drive motor. Pressure equalization may also be achieved by driving the compressor in reverse rotation prior to deenergizing the drive motor.

A compressor assembly may include a shell, a discharge fitting, a muffler, a compression mechanism, and a motor. The shell may have an opening therethrough with the discharge fitting generally extending therefrom. The muffler may be in communication with the discharge fitting and may be external to the shell. The muffler may have an inlet proximate the discharge fitting, an outlet distal from the discharge fitting, and a body portion extending therebetween. The muffler may include a valve assembly proximate the outlet. The compression mechanism may be contained within the shell and include a suction inlet and a discharge passageway. The discharge passageway may be connected to the opening in the shell for direct discharge of refrigerant from the compression mechanism to the discharge fitting. The motor may be contained within the shell and drivingly coupled to the compression mechanism.

Assemblies, apparatuses, and methods to extract or convey a material from a source of the material may include a vacuum generation and sound attenuation assembly. The vacuum generation and sound attenuation assembly may include a compressor housing having a vacuum source, a cooling system, and a vacuum controller. The vacuum source may include a compressor powered by an electric motor and positioned to cause a vacuum flow between the source of the material, and the vacuum generation and sound attenuation assembly. The vacuum generation and sound attenuation assembly may further include a sound attenuation chamber positioned to receive at least a portion of the vacuum flow from, and attenuate sound generated by, the vacuum source. The compressor housing and sound attenuation chamber of the vacuum generation and sound attenuation assembly may be arranged compactly on a common chassis for ease of transport and deployment.

An apparatus and methods for a rotor pack are provided for a positive displacement supercharger that produces greater engine power output without loss of best seal between the rotors or between the rotors and an interior surface of an enclosing case. The rotors include relief zones and cupped portions at an intake airflow side of each lobe comprising the rotors. The relief zones allow additional airflow to enter the rotor pack while the cupped portions scoop additional airflow into the rotor pack during operation of the supercharger. Tapered radius portions of an enclosing case allow additional airflow to be dragged into the rotor pack. Pressure relief portions on a rotor bearing plate and angled portions on each lobe extend compression events during operation of the rotor pack. The angled portions reduce a margin of the lobes to sharpened edges without affecting the diameter of the margin.

A progressive cavity pump rotor can include a scroll portion, which can be configured to interface with a stator, and a head portion, which can be configured to be coupled to a coupling rod with a non-collinear joint, where the scroll portion can be releasably coupled to the head portion with a collinear joint.

The invention discloses a compressor and a refrigerating system. The compressor comprises a machine shell, a motor and a pump body assembly. The shell is provided with an accommodating cavity; the motor is arranged in the containing cavity and comprises a rotor and a stator arranged on the periphery of the rotor in a sleeving mode. The pump body assembly is arranged in the containing cavity, the pump body assembly comprises a crankshaft, a static scroll plate, a movable scroll plate and a support, the crankshaft sequentially penetrates through the support, the movable scroll plate, the static scroll plate and the motor, the crankshaft comprises an eccentric section, and the movable scroll plate is arranged on the eccentric section in a sleeving mode; the outer diameter D of the stator and the outer diameter D1 of the eccentric section meet the relational expression that D / D1 is larger than or equal to 5 and smaller than or equal to 7. The problem that in the prior art, a crankshaft of a scroll compressor is low in reliability can be solved.

Assemblies, apparatuses, and methods to extract or convey a material from a source of the material may include a vacuum generation and sound attenuation assembly. The vacuum generation and sound attenuation assembly may include a compressor housing having a vacuum source, a cooling system, and a vacuum controller. The vacuum source may include a compressor powered by an electric motor and positioned to cause a vacuum flow between the source of the material, and the vacuum generation and sound attenuation assembly. The vacuum generation and sound attenuation assembly may further include a sound attenuation chamber positioned to receive at least a portion of the vacuum flow from, and attenuate sound generated by, the vacuum source. The compressor housing and sound attenuation chamber of the vacuum generation and sound attenuation assembly may be arranged compactly on a common chassis for ease of transport and deployment.

Screw pump (2) comprising: a casing (3) with an inlet (30), an outlet (31) and a flow chamber (32) between the inlet and the outlet; at least two screws (4, 5, 6) housed in the flow chamber to force a fluid flow through the flow chamber from the inlet to the outlet; and a flexible coupling (11) connected to one of the screws to couple the screw to a drive motor (10).

The disclosure relates to a screw pump (2) comprising: a casing (3) with an inlet (30), an outlet (31) and a flow chamber (32) between the inlet and the outlet; and at least two screws (4, 5, 6) housed in the flow chamber to 5 force a fluid flow through the flow chamber from the inlet to the outlet; wherein the casing (3) comprises a shell (33) within which an insert (34) defining the flow chamber is housed.

The utility model relates to a cross slip ring assembly and a scroll compressor. According to one aspect of the utility model, the utility model provides a cross-shaped slip ring assembly, the cross-shaped slip ring assembly is used for a scroll compressor, and the cross-shaped slip ring assembly comprises a cross-shaped slip ring body; the key extends from the cross-shaped sliding ring body and is used for being matched with a key groove formed in a key matching part of the scroll compressor, the key comprises a matching part used for being matched with the key groove, the matching part is provided with a working surface serving as a stress side surface, and the stress side surface is provided with a stress side surface. A groove is provided only at the working surface among the working surface of the mating portion and a non-working surface opposite to the working surface. According to the utility model, the abrasion of the working surface of the matching part of the key of the cross slip ring assembly can be reduced.

A progressive cavity pump rotor can include a scroll portion, which can be configured to interface with a stator, and a head portion, which can be configured to be coupled to a coupling rod with a non-collinear joint, where the scroll portion can be releasably coupled to the head portion with a collinear joint.

An apparatus for use in drywall plastering, and more specifically for applying a pumpable finishing compound to a surface, is disclosed. The apparatus comprises a receptacle for storing the pumpable compound, an applicator for applying the compound to a surface or feature to which the compound is to be applied, a pump for pumping the compound from the receptacle to the applicator for application to the surface or feature, an electric motor which drives the pump, a battery that powers the electric motor, and a conduit through which the compound is pumped from the receptacle to the applicator, and the receptacle, pump, motor and battery of the apparatus may be able to be worn by a user, or carried on a part of the user's body, while the apparatus is in use for applying the compound to the surface or feature. The apparatus is self-contained and self-powered, and it can consequently operate in an “untethered” manner in the sense that it does not require any power cables extending from the apparatus to a remote power outlet or generator, and there is no need for any hoses or the like to deliver finishing compound, or compressed air, or anything like that, to the apparatus while it is in use.

The invention discloses a segmented reverse rotor structure of a two-stage compression oil injection screw compressor. The segmented reverse rotor structure comprises a machine shell, a rotor and a rotor, the first-stage male rotor is rotatably installed in the first-stage compression chamber of the machine shell, and one end of a rotor shaft of the first-stage male rotor penetrates through a partition piece of the first-stage compression chamber and a partition piece of a second-stage compression chamber of the machine shell and extends into the second-stage compression chamber; the first-stage female rotor is rotatably mounted in the first-stage compression chamber and engaged with the first-stage male rotor; the second-stage male rotor is rotatably mounted in the second-stage compression cavity and coaxially connected to a rotor shaft of the first-stage male rotor, and the spiral direction of the second-stage male rotor is opposite to that of the first-stage male rotor; the second-stage female rotor is rotatably mounted in the second-stage compression chamber and engaged with the second-stage male rotor; and the cooling chamber is connected with a cooler through the oil return pipe. The two-stage screw compressor solves the problems that in an existing two-stage screw compressor, the load of axial bearings of the first-stage male rotor and the second-stage male rotor is large, and the service life is short.

Eccentric screw pump with a rotor of a drive shaft circulating essentially about a fixed axis in relation to the stator in a bearing block, a power train and a screw conveyor, which revolves in a rotating-oscillating manner in a screw flight of the stator, wherein the power train provides the screw conveyor with its drive torque and the power train adjusts the differences of the motion sequences of the screw conveyor and of the drive shaft, wherein the power train consists essentially of a one-piece rotational body, which has multiple weakening recesses, which interrupt its outer circumferential jacket surface more than only insignificantly and which provide it with that reversible elasticity, which it requires in order to rotate about an axis of rotation, which curves in a periodically recurring manner at least in sections.

A front cover and a rear cover are fixedly installed and define a cavity, a driving gear shaft and a driven gear shaft are installed in the cavity, a first gear on the driving gear shaft is meshed with a second gear on the driven gear shaft, and the two gears and the inner wall of the cavity define an oil suction cavity and an oil discharge cavity. The two floating side plates are arranged on the two sides of the two gears in a penetrating mode through the driving gear shaft and the driven gear shaft respectively, an ear-shaped high-pressure oil groove and an unloading groove are formed in the face, close to the gears, of each floating side plate, the ear-shaped high-pressure oil grooves are close to one side of the oil discharge cavity, the unloading grooves are close to one side of the oil suction cavity, and the two ends of the unloading grooves are communicated with through holes of the floating side plates respectively. An ear-shaped groove is formed in the face, away from the gear, of each floating side plate, and a compensation area is formed on the floating side plates around the ear-shaped grooves. And a radial gap is formed between the peripheral edge of the floating side plate and the inner wall of the cavity. The comprehensive performance of high pressure, large displacement, low noise and high efficiency of the bevel gear pump is improved.

The utility model provides a Roots blower with a double-oil-pump circulating cooling device, which comprises a Roots blower main body and the double-oil-pump circulating cooling device, the Roots blower main body comprises an oil tank, a driving end wall plate and a non-driving end wall plate, and the double-oil-pump circulating cooling device comprises a first oil pump, a second oil pump and a cooler. The oil tank communicates with the first oil pump and the second oil pump, the first oil pump and the second oil pump are connected in parallel, and the rear ends of the first oil pump and the second oil pump are connected with the driving end oil pipe assembly, the gear end oil pipe assembly and the non-driving end oil pipe assembly correspondingly to lubricate and cool the driving end bearing, the non-driving end bearing, the driving gear and the driven gear correspondingly. The first oil pump and the second oil pump can independently operate to achieve circulating cooling of lubricating oil, when one oil pump breaks down, the other oil pump can be switched to operate in the non-stop state, and long-time stable operation of the air blower is guaranteed. The circulating cooling device can be widely applied to circulating cooling of the roots blower.

A method for inspecting an erroneous / missing part of a discharge valve structure according to the present invention is a method for inspecting the erroneous / missing part of the discharge valve structure (1) of a compressor. The discharge valve structure (1) has an assembly structure including a partition wall (12), a discharge valve (12), a valve retainer (300) and a fixing bolt (40), and an inspection structure in which the valve retainer has an inspection hole (33) for inserting an inspection member and at least a part or the whole of the discharge valve enters a region of the discharge valve (20) corresponding to the inspection hole (33). The presence or absence of the discharge valve is inspected by inserting the inspection member into the inspection hole and by an insertion depth of the inspection member.

The invention relates to the technical field of compressor temperature control, and discloses a compressor temperature control system capable of preventing generation of condensate water, which comprises a sensing module, an execution module and a controller. The sensing module is used for collecting air temperature, relative humidity, system working pressure and circulating oil temperature parameters of the compressor in real time. The controller is configured to calculate the current pressure dew point of the system based on the air temperature, the relative humidity and the working pressure of the system; the pressure dew point serves as a floating lower limit, a preset system optimal working temperature upper limit serves as a fixed upper limit, and a dynamic safe working interval is determined; finally, a cooling unit and a heating unit in the execution module are cooperatively controlled to work according to the relation between the circulating oil temperature and the dynamic safety working interval. By establishing the dynamic safety lower limit changing along with the working condition, the problem that the compressor is prone to generating condensate water under the high-humidity or low-load working condition to cause oil emulsification is effectively solved, and accurate and energy-saving temperature control is achieved.

This invention provides a variable pitch screw vacuum pump, belonging to the field of pump body technology. It solves the problem that existing variable pitch screw vacuum pumps require increased screw length to achieve higher pumping efficiency. This variable pitch screw vacuum pump includes a pump body containing two rotors. Each rotor has K helical turns, and the total length of the rotor is L. The screw pitch from the inlet to the outlet is P1 to Pi, respectively. One rotor is left-handed, and the other is right-handed, and the two rotors mesh with each other. The end face profile of one rotor rotates around the center of rotation by a central angle θ. The rotor has a helical coordinate equation, including X, Y, and Z axes. The outer circumference of the rotor is formed by rotating the curves along the helical curve on the end face profile. The rotor of this variable pitch screw vacuum pump can be adjusted to the optimal pitch for different needs, thereby reducing the rotor length while achieving high pumping efficiency.

An oil-free compressor includes a compressor housing with a suction inlet and a discharge outlet, a compression mechanism and a liquid-vapor separation volume disposed within the compressor housing, a crankshaft. The compression mechanism has an inlet fluidly connected to the suction inlet and a discharge volume fluidly connected to the discharge outlet. The crankshaft is engaged with the compression mechanism. The liquid-vapor separation volume is configured to separate a mixed phase of working fluid into liquid working fluid and gaseous working fluid. The liquid working fluid is supplied to the bearing. A heating, ventilation, air conditioning, and refrigeration (HVACR) system includes a refrigerant circuit with an oil-free compressor, a condenser, one or more expanders, and an evaporator.

The utility model discloses a diffusion type exhaust passage structure of double-screw gas conveying equipment, which mainly comprises an air cylinder and an axial exhaust pipe arranged on the air cylinder, and the diffusion type exhaust passage structure of the double-screw gas conveying equipment comprises the specially designed axial exhaust pipe. The direction of the airflow in the pipeline is basically consistent with that of the airflow from the compression cavity, so that mechanical loss caused by rapid turning of the airflow in a traditional structure can be avoided. A guide plate device is specially designed at an inlet of the axial exhaust pipe. Air flow from the compression cavity directly flows into the gaps of the guide plates and moves forwards along the guide plates, and energy loss caused by air turbulence in a traditional structure can be reduced. A plurality of diffusion areas are formed at the inlet of the exhaust pipe by utilizing the guide plate and the inner wall of the pipeline, and the dynamic pressure of high-speed airflow from the compression cavity is converted into static pressure by utilizing the diffusion areas, so that the pressure is increased while the speed is reduced, and the energy loss caused by the high-speed airflow is avoided.

The invention relates to a vehicle-mounted screw air compressor oil emulsification prevention method and system, a medium and a program product, and in the method, the running state parameters of a screw air compressor are monitored in real time, and a water vapor saturation pressure formula and a temperature and pressure coupling mathematical model are used for calculating saturation water vapor pressure and actual water vapor partial pressure respectively. When the actual water vapor partial pressure is larger than the saturated water vapor pressure force corrected by the safety coefficient, the system adjusts the oil way temperature control valve to reduce the lubricating oil flow of the oil cooler so as to increase the exhaust temperature. If the condensation risk still exists and the exhaust temperature does not reach the shutdown protection threshold value, the oil way temperature control valve continues to be adjusted; if the exhaust temperature reaches the shutdown protection threshold value, the actual water vapor partial pressure is reduced by reducing the rotating speed of the frequency converter. And after the condensation risk is eliminated, the current operation parameters are maintained. The method is used for reducing the possibility that water vapor reaches saturation in the compression system and liquid water is separated out, and the accuracy and stability of lubricating oil emulsification risk control of the air compressor under the variable load working condition are improved.

A bearing system for a compressor including an unloader at least partially received within a recess of a driveshaft. The unloader includes an outer surface that is engaged with a bearing. An inner surface of the unloader is curved such that the unloader is pivotable relative to the driveshaft unload forces on bearing caused by deflection of the driveshaft.

The application belongs to the technical field of liquid ring vacuum pumps, and particularly relates to a rotatable pump body structure liquid ring vacuum pump, which comprises a pump body, an impeller, a pump shaft, a pump body side cover and a distributor, the pump shaft sequentially penetrates through the pump body, the distributor and the impeller and is rotationally connected to the pump body side cover, the impeller is fixedly installed on the pump shaft, and the pump body is internally provided with a rotating pump body structure surrounding the impeller. In the application, the pump shaft drives the impeller to rotate, the impeller drives the liquid ring to rotate at a high speed, the rotating liquid ring drives the rotating pump body to rotate through friction, the liquid ring and the rotating pump body are relatively static, and the friction and energy loss of the liquid and the rotating pump body are greatly reduced.

A compressor may include: a lower and upper cylinder each including: a compression chamber configured so that a refrigerant is compressed in the compression chamber and the compressed refrigerant is discharged from the compression chamber, a lower muffler on a lower side of the lower cylinder, and configured to receive, and reduce noise of, the refrigerant discharged from the lower cylinder and discharge the refrigerant to an accommodation space, and a separation muffler in an upper side of the upper cylinder, and configured to receive, and reduce noise of, the refrigerant discharged from the upper cylinder to the accommodation space, wherein the separation muffler is divided from a flow path along which refrigerant from the lower muffler is discharged so that, before reaching the accommodation space, the refrigerant discharged from the lower muffler is divided from the refrigerant discharged from the separation muffler.

The utility model belongs to the technical field of compressors, and discloses an air inlet structure of a compressor. The compressor comprises a compressor shell and an insertion pipe, an air inlet hole is formed in the compressor shell, the insertion pipe is installed in the air inlet hole and is in interference fit with the air inlet hole, a groove is formed in the inner wall of the air inlet hole, and a heat insulation cavity is defined between the groove and the insertion pipe; the problems that in the prior art, refrigerants are heated in advance in the process of entering a compressor, the size of the refrigerants is increased, and the efficiency of the compressor is reduced are solved.

A seal assembly for sealing a power input shaft of a progressive cavity pump can include a seal housing arranged around the power input shaft, the seal housing can include a mounted portion, mounted to the progressive cavity pump, a removable portion, removably coupled to the mounted portion, which can be configured to apply a compression force to a seal within the seal assembly, and a sealing element, which can be configured to seal an interface between the mounted portion and the removable portion. The seal housing can be configured so that a portion of the mounted portion can be in direct contact with a portion of the removable portion.

The invention discloses a gear pump cavitation state recognition method based on a physical information neural network, and belongs to the technical field of fluid mechanical state monitoring. Comprising test data acquisition, feature analysis, theoretical flow calculation and cavitation identification. The method comprises the following steps: acquiring gear pump driving wheel rotation angle and flow data under multiple working conditions, and analyzing flow pulsation, time-frequency spectrum and flow pulsation and rotation angle information coupling characteristics under different cavitation states; theoretical flow is calculated, and the cavitation state is divided according to the actual-theoretical flow pulsation rate ratio; constructing a physical information neural network through a cavitation-free state, and embedding theoretical flow into a loss function to enhance the physical interpretability of the model; and after training is completed, the features of different working conditions are input into a neural network to calculate the predicted flow, residual curve features between the predicted flow and the actual flow are obtained, and the residual curve features are input into a support vector machine to achieve efficient classification of non-cavitation, primary cavitation, critical cavitation and serious cavitation. The method is simple in step, convenient to use and high in recognition precision.

A rotary fluid-displacement assembly has a rotor housing assembly defining one or more valve cavities. Each valve cavity can be elongated along the longitudinal axis. Each valve cavity can define an opening in the internal cavity. The rotary fluid-displacement assembly can have respective discharge valve assembly for each valve cavity. Each discharge valve assembly can comprise a blocking element that is configured to be movably disposed in one respective valve cavity of the at least one valve cavity.