210results about How to "Prevent internal leakage" patented technology

A method and device for transforming data with a secret parameter in an elliptic curve cryptosystem based on an elliptic curve defined over an underlying prime field, includes multiplying a point of the elliptic curve; representing the data to be transformed, by a scalar representing the secret parameter, wherein the multiplying includes performing at least one point addition operation and at least one point doubling operation on points of the elliptic curve; providing a representation in affine coordinates of the elliptic curve point to be multiplied and a representation in projective coordinates of intermediate elliptic curve points obtained during the multiplying; performing both the point addition operation and the point doubling operation by means of a sequence of elementary prime field operation types, the elementary prime field operation types including: a first type of prime field operations including field multiplication and field squaring of coordinates of the elliptic curve points and a second type of prime field operations including field addition, field doubling, and field subtraction of coordinates of the elliptic curve points.

The invention presents a MONOBLOC fin and plate heat exchanger design preventing internal leakages and intermixing of high-temperature and low-temperature flows, e.g. oil and fuel. This is achieved through a particular configuration of the heat exchanger, whereby its core assembly is completely or partially produced from a one-piece monolithic metallic block. Owing to that, all brazed seams, which in conventional fin and plate heat exchangers contact with both hot medium and cold medium flows, are fully abolished thereby excluding a source for imperfections usually developing in brazed joints and base metal in the process of pressure-temperature cyclic loading. Employing custom-made individual fins allows about two-fold increase in the strength of brazed joints in comparison with ordinary corrugated fins (due to doubling of the brazed surface). As a result, the suggested configuration allows the design of a high reliability compact heat transfer device for much higher operating pressures than what may be achieved in the conventional fin and plate heat exchanger. This invention may be used in different fields of modern technology, especially for aeronautical engine applications, where the challenge of ensuring reliability levels of one failure in millions of (fleet-cumulative) flight hours, and operating pressure levels of thousands of pounds per square inch, must be met.

The invention discloses an electronic expansion valve. A sleeve (4) is fixed in a main valve cavity (11), a valve core seat (2) is movably arranged in the sleeve (4) axially, a sleeve runner (41) is arranged on the peripheral side wall of the sleeve (4), and a valve core seat side hole (24) is formed in the peripheral side wall of the valve core seat (2). When a refrigerant is in forward flowing, the valve core seat (2) closes a main valve port (441) to break off communication between the sleeve runner (41) and the valve core seat side hole (24), and the refrigerant flows to a valve core valve port (21) through the sleeve runner (41); when the refrigerant is in backward flowing, the valve core seat (2) is moved upwards to open the main valve port (441) to communicated the valve core seat side hole (24) with the sleeve runner (41); when the refrigerant is in forward flowing, by the structural design of the electronic expansion valve, high-pressure refrigerant can be avoided from causing overlarge impact on the valve core seat, and eccentric phenomena of the valve core seat can be prevented.

The invention discloses a pilot-operated type self-holding electromagnetic valve for a gas well mouth, which is applied to natural gas well fields and gas pipelines. The pilot-operated type self-holding electromagnetic valve for the gas well mouth is characterized in that: a cylindrical main spool is arranged inside a valve body; a valve cap is fixed on the upper part of the valve body; a pin electromagnetic head, a primary opened electromagnetic head and a secondary opened electromagnetic head are transversely connected to the side wall of the valve cap; an auxiliary spool is cylindrical, ofwhich the lower end is arranged inside the main spool; an upper compression spring and a lower compression spring are arranged inside the auxiliary spool; a core rod is arranged in the lower compression spring; a balance pressure hole is formed in the valve body and the auxiliary spool; and a communicating hole is formed between the valve body and the valve cap; a pressure relief hole is formed on the valve cap; and an annular groove is formed on an outer wall of the auxiliary spool. The pilot-operated type self-holding electromagnetic valve for the gas well mouth has the advantages that: thepilot-operated type self-holding electromagnetic valve is suitable for pipelines of the natural gas well mouth, and the opening / closing of the valve is finished depending on weak electromagnetic force under the condition of not depending on the drive of an external air supply. After the pilot-operated type self-holding electromagnetic valve is cooperated with a remote control system, functions ofremote control of the opening / closing of a single well, automatic protection at high / low voltage and the like can be realized. Due to double-stage driving of the spool, the main spool is completely opened. The problem of inner leakage resulted from freezing blockage and sand accumulation caused by the throttling effect of the electromagnetic valve with the conventional structure can be solved.

A scaffold for the artificial blood vessel without internal leakage and curved easily is composed of multiple Z-shaped rings arranged axially. Several connecting rods are connected between two Z-shaped rings. The top and bottom Z-shaped rings have archor rods. A segment of sealed artificial blood vessel wall is arranged at both ends of said scaffold. The middle segment of artificial blood vessel wall is linked to said sealed ones in sleeve mode.

The invention discloses an aorta covered stent with a chimney stent supporting pipe. The aorta covered stent comprises a main stent, at least one supporting pipe for releasing a chimney stent is arranged in the main stent, arranged close to the front end of the main stent and tightly and fixedly connected with the inner wall of the main stent, and the wall of the main stent is provided with a through hole communicated with the supporting pipe. By means of the aorta covered stent of the structure, the at least one supporting pipe is reserved in the aorta covered stent, after the aorta covered stent is released and attached to the wall, the chimney stent is then released by the reserved supporting pipe into important branch blood vessels, and blood flow supplying to the important branch blood vessels is accordingly guaranteed. Due to the fact that the chimney stent is released to the inner side of the aorta covered stent, wall attaching of the aorta covered stent cannot be influenced, and inner leakage can be accordingly and effectively avoided; in addition, the aorta covered stent cannot press the chimney stent, and decreasing of cross sections of blood flow channels or blocking of the blood flow channels formed by the chimney stent can be effectively avoided.

The invention relates to a small underwater cable cutting device which comprises an oil cylinder barrel, wherein a piston rod is mounted inside the oil cylinder barrel; a movable cutting knife is connected with one end part of the piston rod through a shaft pin and a set screw; a guiding frame is connected with one end of the oil cylinder barrel; after extending out of the guiding frame, the movable cutting knife is matched with a fixed cutting knife to cut off a cable; the fixed cutting knife is mounted on the bottom surface of the guiding frame; two limiting frames are correspondingly mounted on the upper surface of the guiding frame and the lower surface of the fixed cutting knife; one end of the upper limiting frame and that of the lower limiting frame are simultaneously connected witha vertically-mounted gasket; the movable cutting knife and the fixed cutting knife are positioned between the two limiting frame; and the gasket is positioned between the movable cutting knife and the fixed cutting knife. By the adoption of the small underwater cable cutting device provided by the invention, the technical problem that a conventional underwater cutting device is complex in structure, large in weight and occupied space, high in operating difficulty and low in autonomous operability can be solved; the space can be greatly saved; and the underwater cutting efficiency can be improved.

The invention discloses a fuel cell, and a bipolar plate and a bipolar plate assembly for the fuel cell. The bipolar plate comprises at least one distribution unit; at least one first through hole connected with the corresponding distribution unit through a transverse opening in the side wall of the at least one first through hole so that a first reactant can flow into the at least one first through hole; and at least one second through hole connected with the corresponding distribution unit through a transverse opening in the side wall thereof so as to flow out the first reactant, wherein thecross sections of the at least one first through hole and the at least one second through hole are approximately arc-edge trapezoids or bevel-edge trapezoids in shape, and transverse openings are formed in the curved-surface side wall or bevel-surface side wall. According to the fuel cell, by improving the structural design of the bipolar plate, the gas distribution uniformity of the fuel cell can be improved, and the hydrothermal management is improved, so that the high-current discharge performance and the power density of the fuel cell are improved. In an electric vehicle, the power performance, the fuel utilization efficiency and the endurance mileage of the vehicle can be improved.

The invention discloses an aortic windowing branch covered stent and belongs to the technical field of vascular stents. The aortic windowing branch covered stent comprises a tubular skeleton made of thin filaments and a membrane covering the tubular skeleton. The proximal end of the tubular skeleton is suitable for being inserted into a window of the aortic windowing branch covered stent and communicated with the aortic windowing branch covered stent. The remote end of the tubular skeleton is suitable for being inserted into a branch blood vessel, and the proximal end is harder than the remote end. The aortic windowing branch covered stent lowers the operation difficulty of minimally invasive surgery in an aortic lumen with branch blood flow, solves the technical problem that in the surgery, internal leakage occurs easily, can adapt to fitting the tortuous branch blood vessel and effectively prevents damage to the branch blood vessel and occurrence of re-blocking and internal leakage.

A combined abdominal aorta covered stent system and a utilization method thereof are applied to surgeries for endovascular interventional treatment of abdominal aortic aneurysm. The system comprises a body covered stent and a pair of branch covered stents, and each of the stent is cylindrical and provided with a delivery system. The near end of the body covered stent is a bare stent with barbs, a covered section comprises an upper half portion in a single-cavity cylinder shape and a lower half portion with a fixed outer diameter, and the lower half portion is averagely partitioned into two cavities by a longitudinal partition. Small-waveband stent rings are designed at near and far ends of the covered section of the body covered stent, and other covered parts can be either provided with stent rings or not. The upper half portion of the covered section is implanted at a neck position of infrarenal aortic aneurysm, and the lower half portion is suspended in an aneurysm cavity. The branch covered stents parallelly and internally sleeve the two cavities of the body covered stent, near ends of the branch covered stents are flush with the near end of the lower half portion of the body covered stent and fill the cavities of the body covered stent in a self-adoption manner, and far ends of the branch covered stents are implanted into iliac artery branches to better adapt to arterial aneurysms excessive in aneurysm neck torsion.

The invention relates to a self-operated three-way reversing valve, and belongs to the technical field of fluid control valves. The valve comprises a valve body, a valve cap, a valve core, a spring and the like, wherein the valve body is dislocatedly provided with an evaporator connecting pipe and a condenser connecting pipe perpendicular to an axis of the valve body; a distance L1 between the shaft axis of the evaporator connecting pipe and the shaft axis of the condenser connecting pipe is greater than the sum of the inner radius of the evaporator connecting pipe and the inner radius of the condenser connecting pipe; and the valve cap is provided with an air exhaust connecting pipe of a compressor. The valve adopts simple structures of the spring and the valve core, and realizes effective switching without additional power by using the elasticity of the spring, and differential pressure change generated by switching on and switching off of the refrigeration compressor in an air conditioning unit. The valve has the advantages of simple structure, few consumed material and low manufacturing cost, and can effectively improve energy saving effect and reliability of a heat pipe and vapor compression compound refrigeration air conditioning unit.

The invention relates to a middle sealing sand filling technology capable of preventing inner leakage of investment casting. The technology specially comprises the following steps that silica solutionand zircon powder coating is adopted for a face layer of a wax module, and 120-mesh zircon sand is spread; 2, silica solution and zircon powder coating is adopted for a second layer, and 30-60-mesh mullite sand is spread; 3, silica solution and mullite powder coating is adopted for a third layer, and 30-60-mesh mullite sand is spread, 4, silica solution and mullite powder coating is adopted for afourth layer, only hanging coating is adopted for coating, no sand is spread, a hole is filled with sand after drying, and a hole opening is sealed; and 5, silica solution and zircon powder coating is adopted for follow-up layers, 16-30-mesh mullite sand is spread till requirements are met, and no sand is spread in the last layer. According to the middle sealing sand filling technology, the strength of a deep blind hole and a narrow deep groove of a mold shell can be improved, inner leakage at the positions can be effectively prevented, the inner leakage rate of small holes is reduced from the original 10% to 2% or below after adopting the method through tests, and the effect is obvious.

Methods for ameliorating stent graft migration and endoleak using treatment site-specific cell growth promoting compositions in combination with stent grafts are disclosed. Also disclosed are application of cell growth promoting compositions such as, but not limited to, autologous platelet gel compositions directly to treatment sites before, during or after stent graft implantation. Additional embodiments include medical devices having autologous platelet gel coatings and / or autologous platelet gel delivery devices useful for treating aneurysms.

The invention discloses a valve, in particular to a nuclear second-stage electric V-shaped brake valve comprising a valve rod and an electric device which can drive the valve rod to reciprocate on a straight line, wherein the bottom end of the lower part of the valve rod is fixedly connected with a flashboard subassembly which comprises a flashboard frame, a left flashboard, a right flashboard, a valve seat, a spring and a locating rack, the bottom end of the lower part of the valve rod is also fixedly connected with the flashboard frame, the left flashboard and the right flashboard are clamped in the flashboard frame and are also fixed in the flashboard frame by the locating rack, and a cavity which is provided with a horizontal compression spring is formed between the inner walls of the left flashboard and the right flashboard; the bottom of the flashboard frame is matched with a spacing lug boss of a valve body, and the side wall of the flashboard frame is provided with a groove which can be matched with a guide lug boss of the valve body; a left cavity and a right cavity are formed on the valve body by the flashboard subassembly; the locating rack, the flashboard frame and the valve rod are mutually fixedly connected; the valve seat is arranged between the outer wall of each flashboard and the valve body, and the other side of the valve seat is welded with the valve body. The nuclear second-stage electric V-shaped brake valve has good sealing property, reasonable structure and simple, easy and convenient installation.

The invention discloses a plunger water pump. The plunger water pump provided by the invention comprises two plunger groups which are composed of water cylinders and oil cylinders, a water cylinder piston and an oil cylinder piston of each plunger group are synchronously displaced, a water gap of each water cylinder barrel is provided with a water inlet one-way valve which is in one-way conduction with a cylinder tube cavity from the outside and a water outlet one-way valve which is in one-way conduction with the cylinder tube cavity from the cylinder tube cavity to the outside; and two oil cylinders are alternately stretched under the control of a control valve. The plunger water pump provided by the invention breaks through a traditional water pump structural principle, two oil cylinders are adopted to alternately move and retreat, thereby driving two water cylinders pistons to alternately move, and further the switch of two working conditions is respectively realized; compared with the prior art, the plunger water pump is capable of effectively improving the output flow and the water utilization pressure on the basis of the continuous no-interval foundation; and the invention also provides a liquid control system of the plunger water pump.

The invention relates to the technical field of air conditioners, in particular to a scroll wrap molded line, a scroll plate structure and a scroll compressor. The outer side molded line and the inner side molded line of the scroll wrap molded line are both composed of involute lines. The outer side molded line and the inner side molded line are arranged in a matched manner so that the tooth wall of a scroll wrap can be formed, and the thickness of the tooth wall is gradually increased from the center of the scroll wrap to the outer edge of the scroll wrap; delta t is the thickness change value of the tooth wall of the scroll wrap, and the thickness of the portion, at the center of the scroll wrap, of the tooth wall is smaller than the thickness of the portion, at the outer edge of the scroll wrap, of the tooth wall by 2 delta t. A moving scroll plate of the scroll plate structure is provided with the scroll wrap molded line, a fixed scroll plate is provided with a fixed tooth molded line which is composed of involute lines and meshed with the scroll wrap molded line, and the fixed tooth molded line and the scroll wrap molded line are staggered by 180 degrees. The scroll compressor comprises the scroll plate structure. The scroll wrap molded line, the scroll plate structure and the scroll compressor cannot change the crankshaft eccentricity, and therefore scroll plate stress caused by temperature and pressure is reduced, and strength is improved; and a meshing gap is not changed, and therefore inner leakage is avoided.

The invention discloses a positioning and locking device for a ball valve. The positioning and locking device comprises a limiting post fixed to a valve cover and a limiting disk fixed to a valve rod, wherein the limiting disk is provided with a limiting gap or a limiting groove; the limiting post is positioned in the limiting gap or the limiting groove; a locking block is rotationally arranged on the limiting post; the upper end face of the locking block is lower than the lower end face of the limiting disk; the locking block is provided with a dynamic locking hole; the limiting disk is provided with a static locking hole matched with the locking fixing hole; the dynamic locking hole and the static locking hole are matched with each other, and can be locked through a locking piece. By adopting the positioning and locking device, the opening or closing state of the ball valve can be positioned, and the ball valve can be locked, so that the accuracy of the ball valve is ensured, and internal leakage is avoided.

The invention discloses a honeycomb type heat exchanger adopting multiple times of diffluence and confluence. First-time diversion grooves used for performing confluence and diffluence on honeycomb holes in the first-time diversion grooves are alternately arranged on same end surfaces of honeycomb bodies in an upper heat exchange plate and a lower heat exchange plate, and confluence grooves and diffluence grooves in the first-time diversion grooves are arranged alternately; second-time to fourth-time diversion grooves and inter-communicated through holes which are communicated with the first-time diversion grooves are formed in an upper separation-combination device and a lower separation-combination device respectively, and the second-time to fourth-time diversion grooves realize 2 to 4 times of step-by-step diffluence and confluence; an upper connecting plate is arranged at the upper end of the upper separation-combination device, and a lower connecting plate is arranged at the lower end of the lower separation-combination device; a plurality of connecting through holes communicated with 2 to 4 diffluence or confluence grooves are formed in the upper connecting plate and the lower connecting plate; and cold fluid inlet and outlet and hot fluid inlet and outlet are formed at two ends of the upper connecting plate and the lower connecting plate respectively. The honeycomb typeheat exchanger is large in treatment flow capacity, high in heat exchange efficiency, strong in compressive strength, small in volume, light in weight and high in sealability, can treat liquid with high viscosity and suspended particles, can reduce the cost and is convenient to clean and mount, and the flow velocity of the fluid in each honeycomb hole is uniform and no laminar flow and dead corner exists.

The invention discloses a closed type open commutator which comprises a control box provided with a component for supplying power for commutation, a rotating disk which is positioned below the control box and is provided with a plurality of nozzles, a floating disk which is matched with the rotating disk and is provided with diversion holes corresponding to the nozzles, and a water feeding pipe positioned at the center of the open commutator, wherein a diversion cone is arranged above the water feeding pipe. The commutator disclosed by the invention has a steady commutation process and is high in symmetry and repetitiveness; the flowing state of fluid is stable and symmetric as much as possible at outlets of the nozzles; water sputtering and internal leakage of the commutator are avoided, and interference caused by the commutation process on the flow of a flow device system is also avoided.

The invention provides a heat pump air-conditioning system and a control method for avoiding inner leakage of the heat pump air-conditioning system. The heat pump air-conditioning system comprises a compressor, a plate type heat exchanger communicated with the air suction inlet of the compressor through a refrigerant pipe, a first valve connected to a refrigerant inlet pipe of the heat exchanger, a second valve connected to a refrigerant outlet pipe of the heat exchanger, a first pressure sensor arranged between the first valve and the refrigerant inlet of the heat exchanger, and a controller which can transmit control signals to control the on and off of the compressor, the first valve and the second valve according to the comparing result of the sensed pressure of the first pressure sensor and the saturation pressure of refrigerant. By controlling the on and off of the two valves, the inner leakage of the plate type heat exchanger can be effectively avoided and further corrosion of cooling water to other parts due to the inner leakage can be avoided, so that the losses due to inner leakage of the heat exchanger can be reduced.

The invention relates to a boiler roof sealing device and method, in particular to a method for sealing the body of a power station boiler. the method comprises the following steps of: treating a working surface; fixing sealing dead points; paving a ceramic fiber layer; and paving a diamond stainless steel mesh. The invention also provides a boiler roof sealing device which comprises the ceramic fiber layer and the stainless steel mesh, wherein the ceramic fiber layer is paved on the working surface on which forms expansion difference measurement points among vertical and horizontal wall pipes of the body of the boiler, the stainless steel mesh is arranged on the surface of the ceramic fiber layer, the ceramic fiber layer and the stainless steel mesh are fixed by welding stainless steel nails, the stainless steel nails are arranged on the horizontal working surface in a staggered manner, stainless steel wires are tied to the vertical wall pipes, the welding positions of the stainless steel nails and the tying positions of the stainless steel wires are horizontal sealing dead points and vertical sealing dead points respectively, the area defined by the horizontal sealing dead points is named a horizontal sealing dead point area, the area defined by the vertical sealing dead points is named a vertical sealing dead point area, and the expansion difference measurement points are arranged at the centers of the horizontal sealing dead point area and the vertical sealing dead point area.

The invention provides a quantum security direct information communication method and system based on three degrees of freedom, and belongs to the technical field of quantum communication. A server prepares a super-entangled quantum state, forms a first sequence by using first photons in each Bell state to serve as an information carrier, and sequentially transmits the information carrier to a first user terminal, a second user terminal and a third user terminal. The first user terminal, the second user terminal and the third user terminal finally send back the first sequence to the server through encoding operations with three degrees of freedom in the first sequence respectively. The server can deduce the encoding modes of the first user terminal, the second user terminal and the third user terminal on each degree of freedom by performing super-entangled Bell state measurement on two sequences, in order to collect information. As the security is guaranteed by the non-local correlation features of the quantum entangled state, an eavesdropper can only steal a part of an entangled particle system at a time but cannot obtain the overall state of the quantum entanglement pair, therebyensuring that the information is not leaked.

This invention relates to one wheel anti-explosion hydraulic brake, which comprises wheel brake rack and Pump hydraulic system and control device, wherein, the pump cylinder hydraulic system comprises hydraulic pump, single oil cylinder, overflow valve, anti-explosion magnetic valve, single valve, pressure meter switch, proportion flow save valve, proportion pressure valve, anti-explosion motor, filter, cylinder oil case with air filter and system oil case; the control device comprises transducer, breaker, alternating touch device, heat relay, leakage protector, direct drive power, programmable controller, local isolation grating and point button and non-touch near switch.

A scroll compressor, wherein in a rotating scroll and a fixed scroll having a spiral formed by using an algebraic spiral curve as a basic vortex curve, the inner wall surface of the fixed scroll spiral body is extended to a point beyond the outer wall surface of the rotating scroll spiral body Position, the center of the basic vortex curve and the center of the end plate are staggered, and the liquid jet inlet is arranged at a position where the closed space with a smaller design volume ratio is connected for a long time. As a result, the scroll compressor can increase the volume ratio while using the same outer diameter of the spiral body, and can be more efficient when operating at a high pressure ratio.

The invention relates to a full-sealed type slag discharging system of a coal mill. The full-sealed type slag discharging system comprises a first pipeline, a ceramic valve, a viton sealing ring and a sealed slag box, wherein the first pipeline is arranged at a slag outlet of the coal mill and is communicated with the slag outlet of the coal mill; the ceramic valve consists of a ceramic sealing pair and a spring jacking type structure and is arranged below the first pipeline; the viton sealing ring is directly embedded into a lower flange of the ceramic valve; and when the slag box is jacked, the slag box is directly in contact with the ceramic valve to form a sealed environment. The full-sealed type slag discharging system also comprises a manual hydraulic trolley which is arranged below the sealed slag box and has functions of jacking and descending the slag box. According to the full-sealed type slag discharging system, internal leakage and external leakage which are caused by poor sealing of the valve of the slag discharging system are fundamentally avoided; and a phenomenon of dust flying in a slag discharging process is avoided.

The invention discloses a collector plate of a vanadium redox battery and a preparation method thereof, and the collector plate of the vanadium redox battery has the characteristic of improving the charging and discharging performances; the collector plate of the vanadium redox battery comprises an electricity-conduction plastic body which is formed by distributing a plurality of electricity-conduction plastic strips at interval, a flow field plate is arranged between the two adjacent electricity-conduction plastic strips, and the height of the electricity-conduction plastic strips and the height of the flow field plate are unequal to form an electrolyte solution groove; the preparation method is that: a. electricity-conduction fillers are added in a thermoplasticity polymer to obtain thermoplasticity electricity-conduction plastic strips; b. the electricity-conduction plastic strips are arranged and fixed at interval; c. epoxide resin or phenolic resin for forming the flow field plate is cast among the electricity-conduction plastic strips; d. solidification. When the electrolyte solution flows in the electrolyte solution groove, the flowing is unobstructed, and the battery polarization is low; the vanadium redox battery arranged in the collector plate has good charging and discharging performances, thereby being popularized and applied to the vanadium redox battery.

The invention discloses a stop valve and an air conditioner with the stop valve. The stop valve comprises a valve seat, a lantern ring, a valve spool and an elastic sealing element, wherein a valve chamber and a fitting chamber communicated with the valve chamber are defined in the valve seat, the fitting chamber is located on the first end surface of the valve chamber and the valve chamber is further provided with two openings communicated therewith; the lantern ring internally sleeves one opening; the valve spool comprises a fitting part and a stop part arranged on the fitting part, the fitting part in in threaded fit with the fitting chamber, the stop part is located in the valve chamber and is in threaded fit with the valve chamber, and the stop part is in contact with the first end surface of the lantern ring to connect / disconnect the two openings; the elastic sealing element is arranged on the end surface, towards the lantern ring, of the stop part, and the elastic sealing element is in contact with the end surface of the lantern ring to disconnect the two openings. The stop valve disclosed by the invention has the advantages that the locking torque is reduced to a certain extent, the wear of the sealing surface between the lantern ring and the valve spool is avoided, the internal leakage of the stop valve is avoided, the service life of the stop valve is prolonged and the maintenance rate of the stop valve is reduced.

The invention relates to a valve needle assembly and an electronic expansion valve with the valve needle assembly. In one aspect, the invention provides the valve needle assembly. The valve needle assembly comprises a valve rod, a valve needle, an elastic element and a stop structure; the valve needle is connected to the valve rod and can move in the axial direction relative to the valve rod; theelastic element is arranged between the valve rod and the valve needle; and the stop structure is configured to limit the axial movement of the valve needle relative to the valve rod so as to preventthe valve needle from opening a valve port of the electronic expansion valve in advance under the acting force of fluid. In another aspect, the invention provides the electronic expansion valve. The electronic expansion valve comprises the valve needle assembly. According to the valve needle assembly and the electronic expansion valve, the phenomenon that internal leakage is caused due to the factthat the electronic expansion valve is opened in advance under the action of the fluid can be avoided, and the flow of the fluid flowing through the electronic expansion valve can be accurately controlled in a forward state and a reverse state; and in addition, the electronic expansion valve is provided with a balance passage, so that the stress of the valve needle assembly can be effectively balanced.

The invention discloses an electronic expansion valve, in which a sleeve (4) is fixed in the main valve chamber (11), the lower end of the sleeve (4) is supported by the valve seat (1), and the sleeve (4) The lower end of the main valve port (441) surrounds the main valve port (441); the valve core seat (2) is movably arranged in the sleeve (4) in the axial direction, and the lower part of the valve needle part (3) extends into the sleeve ( 4) to open and close the valve core valve port (21); the sleeve (4) is provided with a first flow hole (41) close to the main valve port (441) on the circumferential side wall, and The second flow hole (42) away from the main valve port (441). When the refrigerant flows forward, the structural design of the electronic expansion valve can prevent the high-pressure refrigerant from causing excessive impact on the valve core seat and prevent it from eccentricity, thereby avoiding the occurrence of internal leakage and ensuring the reliability of the system.

The invention discloses an integral light manual pump which comprises a steering wheel, a pump shaft, a pump body, plungers, an oil distribution shaft, a cylinder body and a rear cover. The pump body and the rear cover are matched to form a pump cavity. The pump shaft is arranged in the pump cavity. The left end of the pump shaft penetrates out of the pump cavity. The steering wheel is arranged at the left end of the pump shaft. The right end of the pump shaft is sleeved with the cylinder body. The pump shaft is in interference fit with the cylinder body. A plurality of plunger sleeves are arranged on the cylinder body. The front end of the oil distribution shaft is located in the cylinder body. The plungers are located in the plunger sleeves. A pump body oblique face is arranged in the pump body and is of a reinforcing rib structure. The pump body oblique face and the pump body are integrally formed through finish casting. The pump body oblique face is rotatably sleeved with a retainer plate. The front ends of the plungers are connected to the retainer plate. The pump body is made of aluminum alloy. The pump body of the integral light manual pump is made of aluminum alloy, and an original all-steel structure is replaced. The pump body oblique face is of the reinforcing rib structure, so that the weight is reduced. In addition, the pump body oblique face and the pump body are integrally formed through finish casting, the structure is compact, and the size is small.