38results about How to "Short flow distance" patented technology

Gas supplied to gas flow passages of a top plate from a gas supply device by gas supply lines forms flow along a vertical direction along a central axis of a substrate, so that the gas blown from gas blow holes can be made to be uniform, and a sheet resistance distribution is rotationally symmetric around a substrate center.

A method of casting a rotary friction plate includes preparing a casting mold with a cavity and a core shaped to form the friction plate. Molten metal is poured into the mold through a central sprue where a portion of the metal flows radially outward across the top of the core to fill friction plate forming regions of the cavity from above, while another portion flows through a central opening in the core to fill a hub forming region at the bottom of the cavity as well as additionally supply metal to the lower friction plate forming region from below. The metal is allowed to cool, which begins at the radially outer regions of the at least one friction surface and progresses radially inward to develop a uniform cast structure.

The invention relates to a novel multi-bed radial fixed bed reactor which is distributed in a barrel shape. The novel multi-bed radial fixed bed reactor comprises a raw material inlet, catalyst beds, high-density porcelain balls, a ring-shaped channel, a center channel, a center channel distributor, a ring-shaped channel distributor, outer side grids, inner side grids, a reactant outlet and baffles, wherein the raw material inlet is formed in the top of the reactor, and the reactant outlet is formed in the bottom end of the reactor; the catalyst beds are distributed in the reactor along the radial direction in a ring barrel shape; the center channel is arranged in the center of the reactor, and the ring-shaped channel is arranged around the outer ring of the catalyst beds; the center channel and the ring-shaped channel are respectively provided with the baffles; the high-density porcelain balls are arranged on the baffles; the outer side grids are arranged at the outer sides of the catalyst beds, and the inner side grids are arranged at the inner sides of the catalyst beds. The novel multi-bed radial fixed bed reactor has the advantages that the sectional feeding proportion can be flexibly adjusted, and the bed pressure drop is effectively reduced.

The invention discloses a high-density fish and vegetable co-existing system which comprises fish tanks, a planting system and a water storage tank, wherein the planting system comprises hydroponic vegetable breeding grooves and river stone breeding beds; the fish tanks are connected with flow diversion tanks and a solid sewage separation tank; the solid sewage separation tank is connected with a bacterial sewage decomposition tank; the bacterial sewage decomposition tank is connected with the water storage tank; the water storage tank is connected with the flow diversion tanks through a water pump; the flow diversion tanks are connected with the planting system; the other end of the planting system is connected with the water storage tank through a pipeline. A fish breeding system is adopted for generating nutritional water, and the nutritional water is diverted into the planting system through the flow diversion tanks and provides normal nutrition for plant growth; large-scale high-density production can be realized and the efficiency is high; water subjected to multiple purification is relatively good in quality; breeding and planting system structures are independent; the co-existing system is simple in structure and convenient to manage and maintain; the breeding system is low in operation cost, low in energy consumption and environment-friendly; the co-existing system has the characteristics of simple structure, stability and convenience for mounting, maintenance and operation; diversity of culture of leaf vegetables and melon and fruit vegetables can be realized.

The invention discloses a multilayer casting filter, comprising a support layer (1) made of a ceramic material and a filtering layer (2) made of a ceramic material and arranged on the support layer. The filtering layer contains alveolate filtering holes (3); the support layer contains grid liquid flow holes (4); a hole density of the filtering layer is larger than that of the support layer; an aperture of a filtering hole is smaller than that of a liquid flow hole; a porosity of the support layer is larger than that of the filtering layer (2); and a thickness of the filtering layer is smaller than that of the support layer. The invention can simplify a pouring system, increase produce rate of a cast technology, reduce cast costs, enhance flow velocity and continuity of pouring, facilitate cast mold filling, improve high temperature impact resistance and high temperature bearing capacity of the filter, ensure integrity of the filter in the whole pouring process, facilitate filtering purification of metal liquid and improve inner quality and comprehensive performances of a cast product, and is suitable for pouring of multiple-part mold and large and medium size cast.

A filter for filtering plastic melt prior to feeding the melt into an extruder nozzle, for example a thermoplastic film extruder nozzle, has preferably two filter housings for holding respective exchangeable filter cartridges. Both filter housings are articulated by hinges to a column mounting so that one filter housing can be serviced while the other filter housing with its filter cartridge is in a filtering position and vice versa. A single filter may be used alternatively. In both instances the column mounting may include at least one, preferably two, mounting columns.

An oil-gas well structure and a segmental flow-control method for a flow-control filter string (5) used in the oil-gas well are disclosed. The oil-gas well comprises a well wall (1) and a sand control screen (2) already run within the well wall, a clearance at least partially exists between the sand control screen (2) and the well wall (1), the flow-control filter string (5) is run into the sand control screen (2), the flow-control filter string (5) is provided with flow-control filters (6), an annular space is formed between the flow-control filters (6) and the sand control screen (2), and the clearance and the annular space are filled with anti-channeling flow pack-off particles (7). The segmental flow-control method for the flow-control filter string (5) comprises the following steps: 1) establishing a channel (2-1); 2) running the flow-control filter string (5); 3) filling with the anti-channeling flow pack-off particles (7); 4) sealing; 5) disconnecting a run-in string connected to the flow-control filter string (5). The segment flow control of the flow-control filter string (5) is achieved by using a pack-off effect of the anti-channeling flow pack-off particles (7).

The invention provides a gravity casting process of a lead-free brass tap, which has the advantages that a flowing distance of a product in a casting process is short, the simultaneous solidification is achieved, hot cracks are reduced; a heat balance effect of a mould is good, so that heat balance of the product is facilitated, and the stress micro-cracks during cooling are reduced. The gravity casting process of the lead-free brass tap comprises the following step of casting and forming lead-free brass liquid through a gravity casting device, wherein the gravity casting device comprises an upper half mould, a lower half mould and a sand core, wherein mould cavities matched with a tap body in shape are respectively and correspondingly arranged between the upper half mould and the lower half mould, the sand core is arranged in the mould cavities between the upper half mould and the lower half mould, the shape of the sand core is matched with the shapes of a water inlet part and a water outlet part of the tap and an inner cavity of an installing part of a valve core, a casting cavity is formed between the sand core and the mould cavity, a sprue in which lead-free molten copper is cast is arranged in the lower half mould, the sprue is connected with the casting cavity, the sprue is provided with an internal sprue and an external sprue, and the internal sprue is correspondingly arranged at the casting cavity for forming the water inlet part of the tap body.

The invention discloses a linear type fast-assembling peristaltic pump assembly. The linear type fast-assembling peristaltic pump assembly comprises a base, an extrusion roller assembly fixed to the base, and an upper support covering the extrusion roller assembly. Mounting grooves are fixed to the left and right edges of the base correspondingly, hoses with connectors are mounted in the mounting grooves, and the inner side faces of the hoses are in interference fit with the extrusion face of the extrusion roller assembly. The two ends of each hose are located on the same straight line. A locating column is further fixed to the base and rotatably connected to one end of a pressing block, and the other end of the pressing block is fixedly connected with the base through a hand screw. The hoses are covered by the pressing block, and the inner side wall of the pressing block makes contact with the outer walls of the hoses. The linear type fast-assembling peristaltic pump assembly has the remarkable effects that an inlet and an outlet of each hose are located on the same straight line, multiple special requirements can be met, a mounting space of a user is saved, the flowing distance is reduced, and the staying time is shortened; operation is simple, convenient and quick.

The invention provides a pouring sand mould of arc needles for pasture collection machinery and a pouring method. The pouring sand mould includes an upper shell body, a lower shell body and core assemblies; the upper shell body is of an arc structure, and a first straight pouring gate is formed in the arc structure and is communicated with a pouring cup for storing pouring liquid; the lower shellbody is of an arc structure matched with the upper shell body, and a second main pouring gate penetrating through the upper and lower ends of the lower shell body is formed in the portion, corresponding to the first straight pouring gate, of the lower shell body; after the upper shell body and the lower shell body are buckled, at least one first mould cavity is formed, the mould cavities are in arc shapes, the first straight pouring gate and the second straight pouring gate are both communicated with the mould cavities, and after the mould cavities are subjected to pouring, arc needle castingsare formed; the core assemblies are arranged inside the mould cavities and are used for assisting the mould cavities in forming the arc needle castings. According to the pouring sand mould of the arcneedles for the pasture collection machinery and the pouring method, the sand mould is changed into a shell type from an overlapping type; an allowance gate is additionally formed, during pouring, sand consumption is reduced, and the finished product rate is increased.

The invention relates to structural design of a shell and discloses a double-shot injection moulding shell and an injection mold. The double-shot injection moulding shell comprises a first plastic layer and a second plastic layer combined with each other, wherein a first combining surface of the first plastic layer is provided with at least one first convex block; a second combining surface of the second plastic layer is provided with a first concave groove corresponding to the first convex block; the first plastic layer and the second plastic layer are combined through the first combining surface and the second combining surface; the first convex block is tightly embedded in the first concave groove. Therefore, the combining area of the two plastic layers of the double-shot injection moulding shell is increased to enable the combination of the two plastic layers to be firmer and prevent the two plastic layers from stripping.

The invention provides a casting technology for a lead-free brass tap, which the advantages that the flowing distance of products in the pouring process is short, simultaneous solidification is realized, and hot cracks are reduced; the die has excellent heat balance effect, is favorable to the heat balance of the products and reduces stress micro-cracks during cooling. The casting technology comprises the step of casting-molding lead-free brass fluid through a gravity casting device, wherein the gravity casting device comprises an upper half die, a lower half die and a sand core, die cavities fitted with the shape of a tap body are respectively correspondingly arranged between the upper half die and the lower half die, the sand core is arranged in the die cavities between the upper half die and the lower half die, the shape of the sand core is matched with the shape of a water-in part, a water-out part and an inner cavity of a valve core mounting part of the tap body, pouring cavities are formed between the sand core and the die cavities, a gate for allowing lead-free melt copper to be poured is further formed in the upper half die or the lower half die, the gate is connected with the pouring cavities, the gate is provided with an inner gate and an outer gate, and the inner gate is correspondingly arranged at the pouring cavity part for molding the valve core mounting part of the tap body.

The invention relates to a hydraulic steering (1) comprising a hydraulic steering unit (2) and a priority valve (3). The hydraulic steering unit (2) and the priority valve (3) are arranged in a common housing (9). The hydraulic steering (1) comprises a hydraulic pressure supply port (P), a low pressure port (T), two steering connection ports (L, R) and an excess flow port (EF) to supply an external implement. The priority valve (3) distributes hydraulic fluid from the hydraulic pressure supply port (P) between the hydraulic steering unit (2) and the excess flow port (EF). The task of the invention is to provide a more compact hydraulic steering. To this end the hydraulic pressure supply port (P), the low pressure port (T) and the two steering connection ports (L, R) all enter on the same side of the housing (9), and the priority valve (3) is arranged adjacent to the four ports hydraulic pressure supply port (P), the low pressure port (T) and the two steering connection ports (L, R) with two of the four ports (P, T, L, R) on either side of the priority valve (3).

The invention belongs to the technical field of aero-engine turbine cooling, and relates to a turbine blade separation transverse rotation re-intersection type cooling structure. An inner cavity cold air channel is arranged in a hollow turbine blade of the cooling structure, and low-temperature cooling gas flows in the blade to cool the blade. Herringbone partition ribs and C-shaped partition ribs are evenly distributed on the tail edge of the blade in the radial direction and are combined in a staggered mode to guide airflow to be separated, transversely rotate and then intersect. A cold air separation channel is formed between every two adjacent C-shaped ribs, the width of the cold air separation channel is D1, cold air flows downstream in the channel and then is separated into two air flows flowing towards the blade root and the blade tip correspondingly, and the two air flows rotate by 180 degrees for the first time in two cold air rotation channels correspondingly and flow reversely in the incoming flow direction. Each strand of cold air can flow out after passing through a trailing edge crack after being turned for multiple times, and the flowing distance is increased by about 40% compared with a conventional structure, so that the utilization rate of the cold air is increased, and the temperature of the blade is reduced.

The invention discloses a double sealing face fin plate-type heat exchanger which comprises a double seal plate-type chip, a double seal soldering flake, a lower soldering flake, fins and an upper soldering flake. The upper soldering flake is arranged on the upper surface of the double seal soldering flake. The lower soldering flake is arranged on the lower surface of the double seal soldering flake. The fins are arranged between the upper soldering flake and the lower soldering flake. The double seal soldering flake is arranged on the double seal plate-type chip. In the invention, after chips are laminated, two sealing faces are formed around; and due to the addition of the double seal soldering flake, after soldering, two soldering sealing faces are formed around, so that even though the inner sealing face is failed, the second layer of sealing face on the outside can still take a sealing effect, and thus, the reliability of a product is greatly promoted.

The invention discloses a compound subsurface flow constructed wetland with the high drop difference and the adjustable water outflow. The constructed wetland comprises a downward wetland area, wherein an upward wetland area is circularly arranged around the downward wetland area, the bottom circumference of the downward wetland area is evenly provided with water passing holes communicating with the bottom of the upward wetland area, the top of the downward wetland area is provided with a water distribution pipe, the interior of the upward wetland area is successively provided with an upward pool vegetation layer, a first upward pool filler layer and a second upward pool filler layer from top to bottom, the top of the first upward pool filler layer is provided with a water collection pipe,the water collection pipe communicates with one end of each water outlet transverse pipe, and the other end of each water outlet transverse pipe, after passing through the upward wetland area, communicates with the bottom end of each water outlet vertical pipe through each movable elbow. The water outlet height can be freely adjusted by the movable elbows, so that no-void of the filler layer of the downward wetland area top layer can be ensured during the normal operation of the wetland, and the void can be controlled when the filler layer of the top of the downward wetland area is blocked.

The invention discloses a precision plastic forming method for a bevel gear, and belongs to the technical field of metal plastic forming. The method comprises the following steps that characterizationparameters of a bevel gear fine forging piece are obtained; wavy line parameters of the big end and the small end of the bevel gear fine forging piece are obtained according to the characterization parameters; pre-forging die manufacturing is conducted according to the wavy line parameters; a cylinder blank is placed in a pre-forging die, closed die forging is conducted, and a pre-formed piece isobtained; and the pre-formed piece is placed in a finish forging die, blocking upset-extruding forming of a tooth profile part is conducted, and a bevel gear fine forging piece with the integral tooth profile is obtained. By means of the precision plastic forming method, the metal filling capability is improved, the metal filling load requirement is reduced, the die stress is reduced, and the service life of the die is prolonged.

The invention discloses a smoking bin device and a using method thereof. The smoking bin device comprises a left side plate assembly, a right side plate assembly, a rear plate, a top plate, a bottom plate and a door assembly, the left side plate assembly, the rear plate, the right side plate assembly, the top plate, the bottom plate and the door assembly are mutually connected to form a square space, an external air inlet is formed in the upper portion of the door assembly, a purification assembly is arranged on the middle upper portion of the rear plate, the purification assembly comprises afirst filter screen, an internal air inlet, a second composite filter screen and at least one set of draught fans which are sequentially arranged from front to back, the second composite filter screencomprises an activated carbon layer, a sterilization layer and an HEPA layer, and an air outlet is formed in the position, corresponding to the rear portion of an outlet of the draught fan, of the top plate. The smoking bin device is short in air flowing distance, uniform in air inlet of the purification assembly, high in utilization rate, high in air circulation speed, capable of reducing indoorsmoke accumulation and sedimentation, good in air exchange effect, thorough in sterilization and air purification and capable of improving the use comfort of a user.

The invention belongs to the technical field of aero-engine turbine cooling, and relates to a turbine blade adopting a chordwise rotary cooling channel. In a conventional tail edge crack structure, cold air flows into the blade from the blade root and is directly exhausted after flowing through a tail edge partition rib. Heat exchange between cold air and the blade mainly occurs on a blade basin, a blade back and the tail edge partition rib, and the heat exchange area is limited. In the blade, the cold air flows through the chordwise rotary cooling channel, heat exchange between the cold air and two L-shaped partition walls and a circular turbulent flow column is increased, and compared with a conventional structure, the heat exchange area is increased by about 20%. More heat exchange areas increase the capacity of taking away heat of the blade, and the cooling effect of the blade is improved.

The invention discloses a welding heater. The welding heater structurally comprises a mixed gas intake pipeline, an annular fire ring and a plurality of spark plug assemblies, the annular fire ring is connected with the mixed gas intake pipeline and communicated with the mixed gas intake pipeline, the centerline in the length direction of the annular fire ring is perpendicular to the gas intake direction of the mixed gas intake pipeline, the annular fire ring is provided with mixed gas ventilation holes along the annular fire ring, the mixed gas ventilation holes correspond to the spark plug assemblies, and the spark plug assemblies are arranged in the mixed gas ventilation holes. By means of the welding heater, during welding preheating or heat preservation or heating, the centerline in the length direction of the annular fire ring is perpendicular to the gas intake direction of the mixed gas intake pipeline, so that mixed gas starts to be distributed to the adjacent spark plug assemblies once the mixed gas enters the annular fire ring through the mixed gas intake pipeline, the flow distance of the mixed gas is short, the fire ignition speed of the mixed gas is high, the burning efficiency of the mixed gas is high, the burning process is stable, uniform and sufficient, efficiency is improved, and cost is saved.

The invention relates to the technical field of household electrical appliances, in particular to a cross-flow air way module and an air warmer. The cross-flow air way module comprises an outer shell,an impeller, an air guide volute tongue and an air guide volute; the outer shell is provided with an air inlet, an air way and an air outlet; the air inlet and the air outlet are formed in two opposite sides of the air way, and communicate with the air way; the axis of the air inlet is parallel to the axis of the air outlet; the air guide volute and the air guide volute tongue are arranged on twoopposite sides of the air outlet; and set gaps are formed between the air guide volute tongue and the impeller and between the air guide volute and the impeller separately. The cross-flow air way module is higher in air outlet quantity and relatively higher in air speed.

The invention provides a multi-way anti-blocking grinding solution pipeline. The multi-way anti-blocking grinding solution pipeline comprises a main pipeline, wherein a plurality of sand blasting pipes communicate with the main pipeline and are inclined downwards, the plurality of sand blasting pipes are divided into multiple groups, each group comprises two sand blasting pipes, the two sand blasting pipes in any group are symmetrically arranged on a main shaft, and a water inlet is formed in the middle position of the main pipeline. Compared with the prior art, a grinding polishing solution enters the main pipeline through the water inlet, the flowing distance of the grinding polishing solution is short, and abrasive powder deposition in the grinding polishing solution can be effectivelyreduced, so that the pipeline blockage is prevented. The plurality of sand blasting pipes communicate with the main pipeline, so that the pipeline adopting design is simple in structure and convenientto maintain and check, the grinding polishing solution can be provided for multiple stations in two rows, the layout is compact, and occupied space is small; and the sand blasting pipes are inclineddownwards, the grinding polishing solution downwards flows into the sand blasting pipes, on one hand, joints are not easily blocked, on the other hand, deposit, located nearby the joints, of the mainpipeline can flow to the sand blasting pipes, and therefore, the probability of blockage of the main pipeline is reduced.

The invention discloses an integral pattern roof unit assemblage of closed-type compressor, which comprises the following parts: roof, base, discharge chamber lid, silencer lid and cover plate, wherein the roof contains multiple through-holes for working fluid; the base is composed of silencer base, which connects the roof to form part of silencer; the discharge chamber lid connects the roof to form the discharge chamber; the silencer lid connects part of silencer roof and base to form silencer; the cover plate is composed of silencer cover plate, which integrates with the discharge chamber. The invention can prevent working fluid in the silencer from overheating, which reduces the component quantity of compressor.