239results about How to "Low fluid resistance" patented technology

The invention discloses a proportional electromagnetic valve for an electrically controlled high-pressure common-rail fuel injection system of a diesel engine and relates to an electromagnetic valve. A position at which a fixed iron core (8) and a movable iron core (3) of the electromagnetic valve attract each other is a conical polar plane. The fixed iron core (8), the movable iron core (3), a guide pipe (18), a spiral spring (15), an electromagnetic coil (4), a square iron core (19), a shell (14) and a valve body (1) jointly form the electromagnetic valve in an assembling way. When driving current is input into the electromagnetic coil, a magnetic field is generated through a magnetic path in the valve, electromagnetic force with magnitude which is in proportion with the magnitude of the driving current and is not related to a stroke is generated relative to the movable iron core, the movable iron core is enabled to overcome spring force to move, the movable iron core stops moving at a balance point of the two kinds of force and therefore is kept at a stable position, and the movable iron core can proportionally and continuously move according to the magnitude of the driving current to control the opening of the valve. Under complex working conditions under which the diesel engine works, the electromagnetic valve not only can stably control the on / off of a fuel path, but also can accurately and proportionally control the flow of the fuel path according to the driving current.

The invention relates to a glass-lined anti-corrosion steel pipe producing and welding processes. The producing process includes pre-overlaying a nickel-based corrosion resistant alloy layer from 1.5 to 2 mm in inner holes with depth of 30 to 50 mm to the end face of a steel pipe, allowing the nickel-based corrosion resistant alloy layer to fuse on the base material; beveling the overlaid-preprocessed end face of the steel pipe, and smoothly polishing the surface of the nickel-based overlaying layer; performing rust removal and dust treatment on the inner wall of the steel pipe; coating glass powder on the inner wall of the steel pipe in a hot spraying manner to melt and form an inner glass corrosion resistant layer. By coating the inner glass corrosion resistant layer on the inner wall of a metal pipe in a hot melting manner, a glass and metal composite corrosion resistant structure is formed, chemical stability is high, the inner wall is smooth, and fluid resistance is small; the glass-lined anti-corrosion steel pipe has special advantages of corrosion resistance, waxing resistance, wear resistance, resistance reduction and energy efficiency, and can be widely applied in various fields of petroleum, chemical industry, natural gas, tap water, sewage, municipal construction and the like.

A shock absorbing device uses a damper including a cylinder enclosing a viscous fluid; a piston rod; and a piston dividing the interior of the cylinder in two axially separated parts. The piston is connected to the piston rod and has an orifice communicating the two parts. The piston includes an inner member integrally connected with the piston rod, and an outer member disposed about an outer perimeter of the inner member and configured to be axially movable with respect to the inner member. The inner and outer members are configured to define a gap therebetween through which the viscous fluid can flow, and to be biased away from each other by a spring disposed therebetween. The inner and outer members are arranged so that the gap is reduced as the amount that the inner member protrudes into the outer member increases, to thereby define a variable orifice.

A pump according to the present invention has a circular diaphragm 4 placed at the bottom of a casing 2. At the bottom of the diaphragm 4, a piezoelectric element 6 is installed in contact with the diaphragm 4. A narrow space between the diaphragm 4 and the top wall of the casing 2 constitutes a pumping chamber 8. An inlet flow path 12 and an outlet flow path 14 are open to the pumping chamber 8, wherein a check valve 10 is installed in the inlet flow path 12. Immediately downstream of the pumping chamber, the outlet flow path 14 has a narrow segment 16. The narrow segment 16 of the outlet flow path has ½ the diameter and ¼ the cross sectional area of the outlet flow path 14. The outlet flow path 14 has a return inlet 22, which is connected to a return outlet 23 in the inlet flow path via an active valve 24. The active valve 24 is opened and closed freely by an actuator 26 made of shape-memory alloy.

The invention discloses a deepsea manned submersible synchronous folding horizontal stabilizer, which comprises a manned submersible body.A vertical stabilizer is arranged at the tail of the manned submersible body, horizontal stabilizersare symmetrically arranged at the two ends of the vertical stabilizer, the vertical stabilizer is of a fixed structure, and the horizontal stabilizersare of movable structures;open grooves are symmetrically formed in the tail of the manned submersible body, and the horizontal stabilizersextend and retract at the positions of the open grooves; the deepsea manned submersible synchronous folding horizontal stabilizer is compact and reasonable in structure and convenient in operation, and the retracting and extending of the two horizontal stabilizers are synchronously controlled through the telescopic movement of an oil cylinder. During floating and diving of a submersible, the horizontal stabilizersare retracted into the interior of the manned submersiblebody so as to reduce fluid resistance and increase the floating and diving speeds of the submersible. When the manned submersible dives to the bottom of the sea and sails,the horizontal stabilizers can be extended to ensure sailing stability of the manned submarine.

The invention discloses a flying device which comprises a device main body, a sealed inner shell located on the device main body and an outer shell located outside the inner shell. An air channel is arranged between the inner shell and the outer shell; the outer shell located on the upper part of the device main body comprises a plurality of spoilers, and a guide inlet and a guide outlet which are communicated with the outside are arranged between every two spoilers or on each spoiler per se. The air channel is communicated with the guide inlet and the guide outlet respectively; the surface path passed by fluid on the external surfaces of the spoilers is longer than the air path in the air channel on internal surfaces of the spoilers in a corresponding zone, therefore, a high pressure zone produced by low flow rate in the air channel is transferred to a low pressure zone produced by high flow rate outside the outer shell from the guide outlet; and the surface path passed by fluid on the outer shell part at the upper part of the wing is longer than the surface path of the outer shell part at the lower part of the wing in the flying direction. The invention can increase the speed ofthe flying device and can save energy.

The invention discloses a high-flux high-dirt-holding-capacity filtering element, which comprises a filtering medium layer (3), a central tube (2), a shell (1) and upper and lower end covers (10, 11), wherein the filtering medium layer (3) is folded into an arc-shaped fold and then encloses the central tube (2), and the whole is cylindrical; the shell (1) is sleeved outside a cylindrical filtering medium; the filtering medium layer comprises a filtering layer (3b) and plastic net layers (8) which are positioned on two sides of the filtering layer; the filtering layer consists of at least two layers of filtering materials (3d); and the upper and lower ends of the central tube (2) and the shell (1) are fixedly connected with the upper and lower end covers. A high-flux folding filtering element is wide in runner, relatively low in fluid resistance, and more uniform in flow distribution of water inlet and outlet ends of the filtering element. Compared with the conventional W-shaped linear fold designing filtration membrane, the high-flux folding filtering element is improved by over 30 percent in terms of filling density, large in filtering area, high in total dirt-holding capacity and long in service life of the filtering element.

The invention provides an inflatable automobile which is characterized in that the lift force is eliminated by changing the fluid distribution state between the upper part and the lower part of an automobile to change the traditional method that the automobile overcomes the lift force by the weight in hundred years, and therefore, the weight factor does not need to be considered. The bodywork of the automobile is made of light materials; for example, the inflatable layer of the inflatable automobile can be integral or local and can be an outer layer or an inner layer, and meanwhile, a lead-in opening is communicated with a fluid passage, which can greatly reduce the fluid resistance when the automobile runs. In the inflatable automobile which is the lightest in the world, due to the fact that a path through which the fluid of the lower part of the automobile flows is longer than the upper part, and thereby, the pressure of the upper part of the automobile is slightly higher than that of the lower part, and like an invisible hand stably presses the shell of the upper part of the automobile; and compared with the traditional automobiles, the inflatable automobile is more stable and saves more energy when running at high speed. Because the bodywork is the inflatable layer, when an accident happens unfortunately, the self safety is ensured, and meanwhile, the safety of hit automobiles or pedestrians is also increased, the inflatable automobile saves the most energy in the world and is extremely safe.

The invention discloses an ascending and descending dual-buoyancy regulation sinking bed-floating bed water quality purification device. A sinking bed system is provided with a hollow sinking bed water level regulating framework; a circle of hollow outer rectangular framework is tightly fixed on the periphery of an upper rectangular frame of the sinking bed water level regulating framework; water is injected into the sinking bed water level regulating framework and the outer rectangular framework, so that the sinking bed system reaches a fixed planting water level or a growth water level. The device is characterized in that a floating bed system providing region is added to the periphery of a sinking bed; the system balance is controlled through the peripheral single floating bed system; the bed body stability is enhanced, so that the influence of environment factors on the sinking bed and a floating bed is reduced. The water level of water sinking plants in the water is regulated through the water irrigation and water pumping effect inside the sinking bed and the effect of a regulating rope; by controlling the growth position of the water sinking plants in the water, the most proper growth water level of the water sinking plants in the water can be realized; the natural environments are simulated to the maximum degree. The water sinking plants and water emerging plants are combined; the water body ecological system recovery can be facilitated to the maximum degree.

The invention relates to a compound cigarette filter tip which comprises a filter tip section close to the lip end, a filter tip section close to the tobacco shred end and wrapping paper. The filter tip section close to the lip end is provided with a fiber filtration layer, the filter tip section close to the tobacco shred end is provided with a metal sintered porous filtration layer, the metal sintered porous filtration layer is a micro-filtration element made from a metal powder sintered porous filtration material, the metal powder sintered porous filtration material is prepared by using metal particles as a raw material, one-time formation is achieved through a formation technology after pretreatment, and the metal powder sintered porous filtration material is formed after sintering. The filtration material is high in filtration precision, good in filtration effect, uniform in structure and good in reproducibility, so that the compound cigarette filter tip does not deform, has the very good filtration effect on nicotine, tar, nitrosamine and other non-gaseous-phase toxic and harmful substances, does not absorb beneficial aroma components in cigarettes, is high in melting point, does not cause overburning producing cancerogens, prevents scorch and toxic smoke (produced due to scorch of the filter tip), has a good cooling effect and makes cigarettes having a cool and refreshing taste.

The invention discloses a submerging bed-floating bed coupled water purifying device. The submerging bed-floating bed coupled water purifying device comprises a submerging bed and a floating bed which are made of UPVC (hard polyvinyl chloride) tubes, wherein the submerging bed comprises upper and lower rectangular frames which are the same in shape; a plurality of perpendicular connecting tubes are arranged between the two rectangular frames; a plurality of horizontal connecting tubes are arranged in the lower rectangular frame; the frames are internally communicated; a floating block capable of being spliced is embedded into the lower rectangular frame, and a planting pot in which submerged plants are planted is arranged on the floating block; a floating block capable of being spliced is also embedded into the floating bed, a planting pot in which emergent aquatic plants are plants is arranged on the floating block, and artificial seaweeds are suspended between adjacent floating blocks of the floating bed; the submerging bed is placed on the center of the inner outline of the floating bed; a connecting rope is arranged between the submerging bed and the floating bed. According to the submerging bed-floating bed coupled water purifying device disclosed by the invention, positions, in water, of submerged plants are regulated by internally watering and pumping the submerging bed, so that the positions of the submerged plants are changed along with ecological niches of water level, transparency and the like, and a natural water environment is simulated to a greatest extent. The water plant planting amount is large, the varieties are rich, the survival rate is high, and the restoration of water body ecological community is facilitated.

A valve may include a housing forming one inlet and at least one outlet, an operating unit mounted in the housing, and performing expansion or contraction in accordance with a temperature of a flowing working fluid to selectively connect the at least outlet with the one inlet for exhausting the flowing working fluid outside of the housing, wherein the operating unit includes a sliding member slidably inserted into the interior of the housing, a flange member forming a penetration hole and fixedly mounted inside of the sliding member, a rod movably inserted into the penetration hole of the flange member, and a deformable member fixed at the penetration hole of the flange member and expanded or contracted in accordance with a temperature of the flowing working fluid.

The invention discloses an intelligent humidity and temperature control spray burn and scald treatment system, which comprises an intelligent humidity and temperature control host computer, a vacuum pump, a humidity sensor, a liquid storage bottle, a suction catheter, a drainage dressing layer, a medical membrane, an atomizer, a temperature control device, a first temperature sensor and a spray catheter, wherein the other end of the suction catheter is directly or indirectly communicated with a three-dimensional intercommunication structure of the drainage dressing layer; the humidity sensor is directly or indirectly arranged in the drainage dressing layer; the spray catheter is directly or indirectly communicated with the three-dimensional intercommunication structure of the drainage dressing layer; the first temperature sensor is directly or indirectly arranged in the drainage dressing layer. Wound humidity and temperature information is timely fed back by the humidity sensor and the first temperature sensor according to a wound humidity and temperature control range set by the intelligent humidity and temperature control host computer, and the atomizer is regulated by the intelligent humidity and temperature control host computer to spray mist at proper temperature or the vacuum pump is controlled by the intelligent humidity and temperature control host computer to work in different suction states to provide a good healing environment for a burned part of a burned patient.

A high-temperature nickel-based alloy multistage filter and a manufacturing method thereof are disclosed. The multistage filter includes sealed connector segments and multi-stage porous filtration medium layers. The sealed connector segments are at an end of the filter and play roles of connection and sealing. A multi-stage porous filtration medium consists of two or more porous structures which have completely different densities, porosity, materials, minimum pore sizes, average pore diameters, porous structure types, and azimuth angles of the porous structures, and is produced by a metal additive manufacturing process. The multi-stage filter can be produced by a metal additive manufacturing process. Compared with traditional multi-stage filters, the multi-stage filter has excellent corrosion resistance and high-temperature resistance. Integrated manufacturing of a multi-stage porous filtration structure of a metal filter having a complex shape can be achieved; the overall structure of the filter is optimized so that a supporting structure and a filtration medium are formed in an integrated manner and fluid resistance and pressure drop are reduced; the structure of the multi-stagefilter facilitates cleaning and washing; and the filter development and manufacturing cycle is shortened, achieving rapid design and processing of customized filters.

Methods and devices for isolating nucleic acids from a mixture containing such nucleic acids and extraneous matter are provided. In one embodiment, the method of the invention comprises passing the mixture through a glass frit under conditions effective to separate the nucleic acids from the extraneous matter. In a more specific embodiment, the glass frit is a sintered glass frit.

The invention provides a pump-driven two-phase circuit device for heat dissipation of a high heat flux electronic device. Heat is collected and transported by using an endothermic process in evaporation and an exothermic process in condensation during a circulation flow process of a working medium. An evaporator for the circuit device comprises micro-channels and fins. In an area of high heat flux, the micro-channels are used to dissipate heat and increase a heat transfer coefficient of a partial area, while in an area of low heat flux, the fins are used. Due to great area difference between the micro-channel area and the fin area in the evaporator, when the working medium in the micro-channels enters the fin area, volume quickly expands and temperature of the working medium reduces, so as to help heat dissipation of the device in the fin area. By using different structures and with little resources, heat dissipation problems of devices with different powers are solved. The pump-driven two-phase circuit device for heat dissipation of the high heat flux electronic device can adapt to heat dissipation of electronic devices with different heat flux densities and can satisfy working requirements of electronic devices with a heat flux density of 50 W / cm<2> or above.

The invention provides an asymmetric metal filter core and a preparation method thereof. The asymmetric metal filter core is prepared by carrying out composite sintering on powder and comprises a tubular skeleton layer and an operational layer. The operational layer is covered above an external surface of the skeleton layer; the metal filter core has a dimension of d*l* delta equal to phi (30-100)*(100-2000)*(1.7-5.5)mm, wherein d*l* delta respectively represent an external diameter, a length and a wall thickness of the metal filter core; the skeleton layer of the metal filter core has an average aperture of 5-35 mum; the asymmetric metal filter core has an aperture of 0.1-10 mum and an amount of porosity of 25-60%; and the aperture of the skeleton layer is 5-25 mum larger than that of the operational layer. Compared with a homogeneous filter core with a same aperture, the asymmetric powder composite filter core has advantages of high permeability, good regeneration performance and long service life, etc., applies to gas-solid separation and liquid-solid separation and has good application prospects in the fields of gas purification, petroleum chemistry and energy and environmental protection, etc.

The invention belongs to the field of submersible buoyancy force adjusting correlation techniques, and discloses a total-sea-depth buoyancy force adjusting integrated valve set. The total-sea-depth buoyancy force adjusting integrated valve set is of a plug-in mounting structure and comprises a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a speed adjusting valve and a valve body. The first stop valve, the second stop valve, the third stop valve and the fourth stop valve are mounted in the valve body in a plug-in mounting manner and are sequentially connected end to end to form a bridge type loop. Switching of water injection and drainage working conditions of water ballast space is achieved by controlling the start-stop combination among the first stop valve, the second stop valve, the third stop valve and the fourth stop valve. The speed adjusting valve is additionally mounted in the integrated valve set, and therefore the working conditions of the integrated valve set comprise the seawater pump water injection and drainage working condition and the dump injection working condition at the same time. According to the total-sea-depth buoyancy forceadjusting integrated valve set, interchangeability of the valves is good, the overall structure is compact, and mounting and maintaining are convenient.

The invention provides a designing and manufacturing method of a composite blade. Pre-forming sheets are paved on the two sides of a metal framework, and the composite blade of a sandwich structure isformed after curing compounding of curing equipment. Through the manner of manufacturing the composite blade through a composite of the pre-forming sheets, the manufacturing process can be simplified, cost can be reduced, and good integrity and bonding strength are achieved. The invention further relates to the composite blade. The composite blade comprises the composite and the metal framework.The metal framework is pre-manufactured to be in a blade shape, the pre-forming sheets formed by multiple layers of prepreg fiber cloth are paved outside the metal framework, through holes are formedin the metal framework, carbon fiber wiring harnesses used for fixing the metal framework and the pre-forming sheets on the two sides are wound in the through holes, and the composite blade is obtained through curing of the curing equipment. The composite blade has the advantage that the composite blade cannot be screwed or twisted or bent under the limiting condition, weather resistance is good,certain impact resistance is achieved, and the special requirements of aviation and ships can be met.

The invention discloses a method for removing bacterial endotoxins in cephalosporin antibiotics by utilizing macroporous adsorption resins, comprising the following steps: firstly filtering the cephalosporin antibiotics solution containing the bacterial endotoxins and removing solid insoluble matters; then utilizing the pretreated macroporous adsorption resins to carry out static adsorption or dynamic adsorption on the cephalosporin antibiotics solution; and finally crystallizing, drying and grinding the solution after adsorption treatment, thus obtaining the product with bacterial endotoxins in accordance with the quality standard. The method has the advantages of high bacterial endotoxins removal rate, good selectivity, easy desorption, repeated use, low fluid resistance and easy magnification.

The invention provides a low-noise electromagnetic valve comprising an electromagnetic driving mechanism, a traction mechanism and a valve body, wherein the valve body comprises a cylindrical shell, a valve core and an upper cover, both ends of the cylindrical shell are provided with connecting flanges, the valve core is in the structural shape of a cylindrical surface generated in such a way that a pipeline with the diameter equal to that of the cylindrical shell is beveled by the other pipeline at an angle of 45 degrees, the cylindrical shell is provided with a hole in the same structural shape with the valve core, one end of the valve core is articulated on the edge of the hole, and the upper cover is fixed on the hole of the cylindrical shell; the traction mechanism comprises a pull rod and a pulling plate, wherein the pulling plate is articulated with the pull rod and the middle of the valve core; and the pull rod of the traction mechanism is connected with the electromagnetic driving mechanism. The invention has the outstanding disadvantages of fast opening and closing, small size, little fluid resistance, no regenerative noise and wide application prospect in a pipeline control system with higher noise reduction requirements.

The invention relates to a plate heat exchanger (9), comprising a plurality of heat exchanger plates (1, 13), comprising at least one section showing indentations (2, 3, 14, 15), intended to be placed against corresponding indentations (2, 3, 14, 15) of a heat exchanger plate (1, 13) of a corresponding design. At least a first type of indentations (2, 14) and at least a second type of indentations (3, 15) is provided, wherein said first type of indentations (2, 14) and said second type of indentations (3, 15) are of a different design.

The invention relates to an ADCA (Azodicarbonamide) foaming agent waste liquor treatment process which comprises the following steps of: preheating waste liquor to 40-60 DEG C; treating the waste liquor in a vacuum crystallizer under the condition that the temperature is 45-130 DEG C and the vacuum degree is 0-0.1 MPa; separating out sodium sulfate; reducing the temperature of a mother solution obtained after the sodium sulfate is separated to 35-40 DEG C, and crystallizing under the condition that the vacuum degree is 0.080-0.085 MPa; and separating out ammonium chloride. The ADCA foaming agent waste liquor treatment process provided by the invention can recover the sodium sulfate and the ammonium chloride under the precondition of zero sewage discharge and can greatly reduce the treatment cost of waste water.

The invention discloses a stop valve of a pipeline, which comprises a valve clack, wherein the valve clack comprises a sealed valve plate and a lower cylindrical body which is vertical to the valve plate; the internal surface of the lower cylindrical body of the valve clack is a cylindrical ring surface, the cylindrical ring surface is vertical to the sealed surface of a valve seat at a fluid inlet, and an outlet is tangential to an inlet of a valve body, i.e. the tangential line of the center line of the cylindrical ring surface at the outlet is superposed with the tangential line of the center line of the section at the inlet of the valve body. The cylindrical ring surface can be a cylindrical ring with equal diameter and can be also a cylindrical ring with variable diameter. The valve clack of the stop valve structure can lower the local resistance of the valve obviously, lower the pressure of a medium on a valve rod because the structure of the valve clack enables the medium to smoothly flow from an inlet of a valve cavity to an outlet, reduce the energy loss of the pipeline valve greatly, save the running cost of the pipeline and play an indispensable positive role in the aspects of environmental protection and energy saving.

A depressurisation valve for a cooling system comprising: a main chamber having a main valve, a pilot line having a secondary valve and a blowdown line; the main valve being located to seal a path of the coolant system of the nuclear reactor. The main chamber is connected to the cooling circuit via the pilot line allowing coolant to enter the main chamber, and the blowdown line allows coolant to escape from the main chamber, the pilot line having a lower fluid resistance than the blowdown line. The pressure of coolant in the main chamber maintains the main valve in a closed position, and under elevated temperature and / or pressure conditions fluid is prevented from entering the main chamber via a closure of the secondary valve on the pilot line and reduce the pressure from the valve, moving it to its open position.

The invention belongs to the technical field of marine antifouling materials, and particularly relates to a bionic array structure surface antifouling drag reduction material, which is characterized in that a surface structure is prepared from a resin material by referring to a human pagoda tree duckweed leaf surface microstructure, a bionic structure head is grafted and modified by using a silanecoupling agent and nano SiO2, and a PDMS casting method is adopted to obtain a root hydrophobic property. The antifouling and drag reduction effects are achieved through the structure and hydrophobicity of an organic silicon material, an underwater air layer can be formed on the surface of the material after the material is put into seawater, and the array structure and the air layer can play roles in resisting biological attachment and reducing drag, due to the special structure and surface characteristics, the preparation method is simple, the raw materials are easy to obtain, the bionic cross annular column head structure and the hydrophobic characteristic are achieved, the bionic cross annular column head structure can be applied to the surfaces of speedboats, UUVs, underwater gliders, ships, underwater vehicles and the like, fouling organism attachment is prevented, running resistance is reduced, ship energy consumption is reduced, and potential application prospects are achieved.

A filtering aid for filtering an aluminate solution and a using method of the filtering aid relate to a method of using pulverized coal ash and pulverized coal ash residue to serve as the filtering aid. The filtering aid is characterized in that the filtering aid is pulverized coal ash and pulverized coal ash residue of thermal power plants. According to the method, the source of raw materials for the filtering aid is stable and reliable, the preparation method is simple, convenient and practical, and the used raw materials are industrial waste and are low in price and convenient to use. The pulverized coal ash and pulverized coal ash residue have adsorption and entrapment effects on solid impurities and particles suspended in liquid due to different particle sizes and porous characteristics, thereby the purpose of liquid and solid seperation is achieved. The pulverized coal ash and pulverized coal ash residue are used as the filtering aid so that the filtering aid does not cause the loss of an aluminum element in the leaf filtration process, also does not introduce other impurity elements to the leaf filtration process, can keep chemical compositions of an original solution in stability and constant to the maximum limit and is easy to popularize and apply in industry.

The invention discloses a low fin type heat exchanger comprising a tube body and low fin type heat exchange tubes. Channels are arranged at the two ends of the tube body respectively, and a lug type support, a heat source inlet and a cold source outlet are formed in the side wall of the tube body. The channel close to the cold source outlet is provided with a material inlet, and the channel close to the heat source inlet is provided with a material outlet. The low fin type heat exchange tubes are connected through tube sheets and supported through baffle plates arrayed at intervals. The baffle plates are fixed through pull rods arrayed at intervals. The tube sheets are welded to the tube body, and the channels are connected with the tube body through flanges. The low fin type heat exchange tubes are adopted as heat exchange elements, so that the heat exchange area is large, meanwhile, when media flow through the surfaces of the low fin type heat exchange tubes, fins has a turbulence effect on the edge layers of laminar flows to form surface turbulent flows, and a good heat exchange effect is achieved; the low fin type heat exchange tubes are low, so that tube penetrating is convenient, flow resistance is small, differential pressure is low, needed power is low, the fin distance is reasonable, and the heat transfer effect is good.