170results about How to "Reduce internal leakage" patented technology

In the hermetically sealed scroll compressor, an injection pipe for injecting a fluid to a compression chamber is connected to an injecting port of a fixed scroll. The injecting port includes a first injecting port which is provided in the vicinity of a fixed scroll inner curve and injects the fluid to an orbiting outer compression chamber, and a second injecting port 22b which is provided in the vicinity of a fixed scroll outer curve and injects the fluid to a orbiting inner compression chamber 8b. The second injecting port is placed in parallel in a radius direction with respect to the first injecting port and is placed so that an orbiting scroll wrap does not practically communicate with the orbiting outer compression chamber in the state in which the orbiting scroll wrap is in contact with the outer side of a fixed scroll wrap.

The invention provides a balance valve which is used to solve the problems that the prior balance valve has a complex structure, high manufacturing cost and poor sealing performance. The balance valve comprises a valve body; the end part of the valve body is provided with an end cover; the side of the valve body is provided with a first main oil port and a second main oil port; the end face of the end cover is provided with a control port; the valve body is manufactured into a main valve hole along the length direction; a balance valve component and a main valve are sequentially arranged in the main valve hole; the balance valve component comprises a valve sleeve; the valve sleeve is provided with axial through holes; and a cone valve, a pilot valve and springs are sequentially arranged in the valve sleeve. The balance valve is characterized in that the pilot valve is a pilot cone valve; and the number of the springs is two. In the balance valve, the pilot valve and the main valve have a cone valve structure so as to improve the sealing performance of a one way valve; the pilot valve and the main valve are controlled through two springs with different rotating directions, on the premise of reducing no composite force of the springs, the balance valve reduces the force of a single spring, thereby improving the service life of the springs; and the right end of a sleeve is added with a sealing ring so as to improve the sealing performance of a control chamber.

A pneumatic module includes an actuator assembly and a manifold. The actuator assembly includes a main body having a bore, an armature, overmolded primary and secondary plates, a coil and a frame. The manifold includes a valve seat, a control port and a supply port. When the actuator is in a de-energized state, the armature is forced against the valve seat by a spring, sealing off the supply port from the control port. When the actuator is in an energized state, current flows through the coil, thereby generating a magnetic field. The magnetic field forces the armature to move toward the primary plate, causing the valve seat becomes unsealed. Once the valve seat is unsealed, fluid flow is permitted between the supply port and the control port. The one end of the armature has an endcap to minimize mechanical noise generated by movement of the armature against the spring. The frame surrounding the actuator assembly has flanges extending from both ends. These flanges correspond to wells located within the manifold. The flanges and wells are configured such that when the flanges are inserted into the wells, the actuator assembly can be twisted and locked into the manifold without requiring additional traditional fasteners, such as bolts or screws.

The invention discloses a water-hydraulic single-vane type oscillating cylinder, and belongs to key parts of underwater robot joints. The water-hydraulic single-vane type oscillating cylinder is mainly composed of a front end cover, a front sealing cover, a bearing, a rotating shaft, a rotating vane, a fixed vane, a housing, a packaging encoder, a rear sealing cover, a rear end cover and the like, and accordingly two working water cavities are formed. The rotating vane and the fixed vane are both provided with specially-made rectangular sealing rings and pressing and buffering devices; and the bearing is a water lubricating bearing. The water-hydraulic single-vane type oscillating cylinder adopts an all-water lubricating mode and is integrated with the encoder so as to be simple and compact in structure and capable of precisely controlling the output position and speed of the rotating shaft, and be widely applied to driving and controlling of joints of water and underwater robots.

The invention discloses a integral manual multi-path reversal valve applied in loader, which includes integral valve, six apertures are drilled in the valve, three of them are connected with oil inputting channel and the return channel, the valve has a inlet and a return outlet connected to the channels, the aperture is assembled with a moving arm valve pole, rotary valve pole, safe valve, overload valve, outlay common single-way valve and hydraulic control lock device, the moving arm valve pole and the rotary valve pole are the solid valve pole, the hydraulic control lock has pilot and double-direction starting functions, it is sealed in the oil path with the circle line. The valve hydraulic oil has no leakage, the inner leakage is small, it can prevent the moving arm form falling, avoids the lock and oversize manipulating force, it is safe and flexible.

A centrifugal multistage pump “VODOMET-WATER CANNON” contains electric motor, condensing case and pump stages, installed on the pump cases. The pump stages are located inside the case and are centered by the covers, and also by the support. The bearing end shield of the electric motor is sealed with the elastic diaphragm. The condensing case is a leakproof cavity where the condenser and the cable connectors, of the electric motor are placed. The thermoswitch is located in the condensing box on the heat contactor. The pump stages include guide wheels and antifrictional washers. The washers interact with the axial supports—ceramic inlays that are inserted into the guide wheels. The inlays rest on the end clamps on the butt ends of the guide wheels. The guide wheels are sealed with radial inlays and together with pump stages create a hermetic tank.

An orbiting fluid machine has a feature that the speed of sliding movement is low, while vibrations are small, its performance is lowered when the rotational speed becomes high, and this problem is resolved by the following structure. A displacement fluid machine includes a displacer making an orbital motion within a casing into which a working fluid is drawn, thereby drawing and discharging the working fluid, in which an oil retaining mechanism or a seal mechanism is provided at each of opposite end surfaces of the displacer. This results that, axial gaps at the end surfaces of the displacer are effectively sealed so as to reduce a leakage loss, thereby achieving a high performance and a high reliability.

The invention relates to an electro-hydraulic servo valve, which comprises a combined baffle feedback rod (1), a valve core (2), a prestage test hole (3), a filter shell (5) and a filter (6). The electro-hydraulic servo valve is characterized in that: the valve core (2) is positioned at a middle position in an inner cavity of a valve body (4); the combined baffle feedback rod (1) penetrates an upper middle part of the valve body (4), and a ball head at the lower end of the valve body (4) is positioned at an eccentric position of the valve core (2); the filter (6) is rolled inside the filter shell (5); and the filter shell (5) is arranged at the oil inlet (P) of the valve body. The electro-hydraulic servo valve has the characteristics of compact structure, small volume, convenient installation, low pressure, high flow, small internal leakage, less system heat and high frequency response.

The invention discloses a load maintaining valve. The load maintaining valve comprises a valve body and a balance adjustment assembly arranged in the valve body. Two inner cavity main holes are formed in the valve body. A load cavity is pressurized by opening two one-way valve ports of the load maintaining valve, and a load is pushed. The pressure caused by the load acts on a one-way valve element in the balance adjustment assembly, and the one-way valve element is pushed towards a main valve element in the balance adjustment assembly, so that oil is sealed in an oil cylinder, and a leak-free state is achieved. When unloading is required, the main valve element is pushed away from the one-way valve element by generating control pressure which is high enough. Compared with a traditional balance valve, the load maintaining valve has the most outstanding characteristics that the load maintaining valve is not affected by the back pressure of an oil return path, and the performance is stable and reliable.

The invention relates to a high pressure die-locking circuit of a dual-motion plate direct pressure injection machine, comprising an oil pump which is driven by an electric motor, an electromagnetic reversing valve, an electromagnetic switch valve, overflow valves, a hydraulic control check valve and a high pressure die-locking oil cylinder; the electric motor drives the oil pump; the oil outlet of the oil pump is connected with the electromagnetic reversing valve; one working oil nozzle of the electromagnetic reversing valve is connected with the high pressure chamber of the high pressure die-locking oil cylinder through the hydraulic control check valve; another working oil nozzle of the electromagnetic reversing valve is connected with the recovery chamber of the high pressure die-locking oil cylinder; the oil outlet of the oil pump and the recovery chamber of the high pressure die-locking oil cylinder are both provided with the overflow valves; the non-rod chamber of the high pressure die-locking oil cylinder is connected with an oil tank through the electromagnetic switch valve. The proposal sufficiently considers the working characteristics of the dual-motion direct pressing injection machine and optimizes and simplifies the high pressure die-locking control oil path, and the invention is the high pressure die-locking circuit of the dual-motion direct pressing injection machine with more reasonable structure.

The invention relates to a water-lubrication oil-free medium pressure two-stage-compression single-screw-rod air compressor. The air compressor comprises an electric motor, a first-stage single-screw-rod compression main machine, a second-stage single-screw-rod compression main machine, an air filter, a first-stage water and gas separator, a second-stage water and gas separator, a first-stage gas cooler, a second-stage gas cooler and an electrical control box; the first-stage single-screw-rod compression main machine and the second-stage single-screw-rod compression main machine are in transmission connection with the electric motor, and the air filter is connected with a gas inlet of the first-stage single-screw-rod compression main body; and the first-stage gas cooler is connected with the first-stage water and gas separator, the second-stage gas cooler is connected with the second-stage water and gas separator, and the electrical control box is electrically connected with the electric motor. Compared with the prior art, the water-lubrication oil-free medium pressure two-stage-compression single-screw-rod air compressor has the beneficial effects that the whole structure is simple and compact, complex pipelines and valves do not need to be additionally arranged, water lubrication is adopted, resistance losses are small, running reliability is good, volume efficiency is high, oil is avoided, zero emissions are achieved, no environmental pollution exists, running is carried out at the normal temperature, and the air compressor is environment-friendly, energy-saving and low in maintaining cost and has the very good application prospect.

A layer heat exchanger for high temperatures is provided that includes a layer block having layer plates and cover plates and a housing that accommodates the layer block. The housing has a high heat resistance, combined with a high stiffness, and the layer block has a core that is soft and tough relative to the housing.

The invention relates to a centrifugal type volumetric pump, belonging to the field of fluid conveying devices. The centrifugal type volumetric pump comprises a pump casing, wherein a cylindrical pump chamber is arranged in the pump casing, a rotor is arranged in the pump casing in an eccentric manner; end caps are arranged at two ends of the pump casing, and are used for closing the pump chamber, an oil inlet is arranged on any end cap, a plurality of radial holes are uniformly arranged in the circumferential direction of the rotor, plunger pistons are inserted in the radial holes in a matched manner, roller wheels are arranged at end parts of the plunger pistons facing towards the pump chamber; an axial oil outlet is arranged in the rotor, and is communicated with the radial holes; axial through holes are arranged in the plunger pistons, one-way valves are arranged in the axial through holes; a semi-cylindrical oil distributing shaft is arranged in the axial oil outlet, and is fixedly connected with the end cap at one side; when the rotor rotates, the oil distributing shaft can always shade one sides of the radial holes with gradually increasing volume; and springs are arranged in the radial holes, and are used for pushing the plunger pistons to stretch out. The centrifugal type volumetric pump is stable to move, is continuous and smooth to charge and discharge oil, and has the advantages of less internal leakage, low movement noise and reliability in use; moreover, the centrifugal type volumetric pump can be produced to an oil pump with low speed and low flow rate; and therefore the noise caused by movement can be lowered obviously.

The invention relates to the field of compressors, and discloses a scroll compressor and a refrigeration system. The scroll compressor includes a fixed scroll (1) and a movable scroll (2), and the movable scroll (2) Interlock with the fixed scroll (1) to form a compression chamber and can move relatively to compress the medium entering the compression chamber; the back pressure chamber (3), the pressure in the back pressure chamber (3) acts on the movable scroll ( 2) Make the movable scroll (2) in sealing contact with the fixed scroll (1). Wherein, when the movable scroll (2) and the fixed scroll (1) move relative to each other, the back pressure chamber (3) is in fluid communication with the working port of the hydraulic pump (4) or the air source device, so as to pass the hydraulic pressure The working pressure of the pump (4) or the air source device forms a pressure acting on the movable scroll (2) in the back pressure chamber (3). The scroll compressor of the present invention can conveniently make the pressure of the back pressure chamber (3) acting on the movable scroll (2) relatively constant, and has better sealing performance.

The invention relates to a method for determining and maintaining the defect of a servo valve. In the method, the defect type is determined according to the static characteristic curve test result of the servo valve or the roller gap change condition of a rolling mill; the displacement of a valve plug is determined according to the hydraulic output power change of the servo valve, and the abrasion loss of a valve sleeve and the valve plug is determined according to the numerical value fluctuation degree of an internal leakage curve; fit clearance is reduced by improving the assembly accuracy of the valve plug and the valve sleeve; and the electrical zero of the servo valve is adjusted, and the relative position of a valve core and the valve sleeve is adjusted, so that the internal leakageof the servo valve and the abrasion of the valve core and the valve sleeve are reduced, the service life of the servo valve is prolonged, the reserve of spare parts and cost are reduced, and the thickness control accuracy of a steel plate and the qualification rate of a product are improved.

The invention provides a four-way valve used for an R32 refrigerant, and an air conditioner. The four-way valve comprises a main valve body and multiple connecting pipes, a valve chamber is arranged in the main valve body, a valve core is arranged in the valve chamber, divides two ends of the valve chamber into a first valve chamber and a second valve chamber which are mutually independent, and comprises a valve seat and a slider, the slider is slidably arranged on the valve seat which is fixed on the main valve body, the connecting pipes are communicated with the valve chamber of the main valve body and include a connecting pipe E, a connecting pipe S, a connecting pipe C and a connecting pipe D, the inner diameter of each of the connecting pipe E, the connecting pipe S and the connecting pipe C is between 5.0mm and 7.0mm, and the inner diameter of the connecting pipe D is between 3.2mm and 5.5mm. By the four-way valve, the problem of internal leakage of four-way valves in the prior art can be effectively solved.

The invention belongs to a valve, in particular to a flow separation, pressure adjustment and speed adjustment reversing integrated valve. The integrated valve comprises a valve body, an oil inlet andoverflow valve arranged on the valve body, and a pilot pressure adjusting, throttling switching and speed adjusting unit; the valve body is provided with an oil return port, a throttling oil outlet and an oil outlet; an overflow back pressure cavity, an oil outlet cavity, an oil inlet cavity, a throttling oil outlet cavity and a liquid control cavity, axially penetrating through a main hole, arearranged in the valve body at intervals; the throttling oil outlet cavity communicates with the throttling oil outlet; the oil outlet cavity communicates with the oil outlet; the oil outlet cavity communicates with the liquid control cavity by a liquid control hole way; an overflow main valve sleeve is inserted in the main hole to form dynamic seal fit, the outer end thereof is assembled with an outer end stop port of the main hole, and the inner end thereof is provided with a throttling port; and in a non-working state, the overflow main valve sleeve separates the oil inlet cavity from the oil outlet cavity. The integrated valve effectively solves the technical difficulties of high energy consumption, high working medium temperature rise and the like in the prior art, and has the advantages of capability of respectively driving multiple execution elements with different working pressures and flows, lower grade requirement on system modules, capability of realizing speed adjustment andthe like.