101results about How to "Increase flow resistance" patented technology

The machining tool comprises a base and a clamping device arranged on the base, the clamping device comprises clamping units arranged on the periphery of a workpiece to be machined, and a base for fixing the clamping units is arranged on the base; the clamping unit comprises a box body fixed to the base and an air cylinder arranged on the side, away from a workpiece, of the box body, and a plurality of ejector rod mechanisms pushed by the air cylinder are arranged on the side, close to the workpiece, of the box body. The ejector rod mechanism is of a two-section type and comprises a piston in the middle and a piston rod close to one side of a workpiece, a first cavity is formed between the piston and the piston rod, electrorheological fluid is arranged in the first cavity, and an electrode is arranged on the inner wall of the first cavity; according to the novel machining tool, a workpiece in a complex shape can be clamped through the telescopic ejector rod mechanism, meanwhile, the electrorheological fluid in the first cavity and the electrorheological fluid in the second cavity can be converted into a solid state, stable supporting can be provided, and vibration during machining can be reduced through control of the controller.

The invention provides a liquid storage tank capable of adjusting the amount of stored liquid, a refrigerating system and a control method.The liquid storage tank comprises an inner cylinder and an outer cylinder, an outlet pipe is arranged at the bottom of the inner cylinder so that fluid in the inner cylinder can be guided out, and a valve structure is arranged between the inner cylinder and the outer cylinder; in the compression refrigeration mode, the valve structure can guide fluid in the outer cylinder into the inner cylinder when the frequency of the compressor is increased, and the amount of the fluid discharged from the outlet pipe is increased. In the compression refrigeration mode, the valve structure can guide the fluid in the inner cylinder into the outer cylinder when the compressor is subjected to frequency reduction, and the amount of the fluid discharged from the outlet pipe is reduced; in the fluorine pump refrigeration mode, the valve structure can guide fluid in the outer cylinder into the inner cylinder, and the liquid level in the inner cylinder rises. According to the invention, the problem of refrigerant redundancy caused by difference of refrigerant filling amounts required under different operation conditions of a fluorine pump compression refrigeration system can be solved, and the problems of retention and release of refrigerant liquid are solved, so that better circulation amounts required by the refrigeration system under various operation conditions can be met as much as possible.

The utility model relates to a tilt angle sensor with an anisotropic structure and a tilt angle detection system, the tilt angle sensor comprises an anisotropic cavity structure, an anisotropic capillary channel is formed in the cavity structure, liquid metal is injected into the anisotropic capillary channel, and conductive silver paste electrodes are coated at two ends of the anisotropic cavity structure. The tilt angle sensor with the anisotropic structure has higher conductive efficiency and a highly sensitive angle sensing function, and the tilt angle sensor with the anisotropic structure can realize a 0.05-degree high-precision tilt angle sensing function.

The invention belongs to the technical field of soft robots, and particularly relates to a variable-rigidity flexible self-sensing actuator which comprises a flexible actuator, a flexible magnetorheological fluid damping cavity, a flexible magneto-rheological fluid damping device, a flexible magneto-rheological fluid control device, a flexible magneto-rheological fluid control device, a flexible magneto-rheological fluid control device and a flexible magneto-rheological fluid control device. And the square electromagnet is arranged in the middle of the flexible actuator and used for applying a magnetic field to change the viscosity of the magnetorheological fluid. In the use process, after the flexible actuator is driven by pressure fluid, the flexible actuator captures a target object after being pressed, bent and deformed; the magnetorheological fluid is adsorbed in a flow channel of the flexible magnetorheological fluid damping cavity under the action of a magnetic field of the square electromagnet, so that the flow resistance of the magnetorheological fluid in the flexible magnetorheological fluid damping cavity is greatly increased, the clamping force of the flexible actuator is enhanced, and the situation that after the flexible actuator captures a target object, the clamping force is insufficient due to a complex environment, and the clamping force is not enough is avoided. And the object slides down.

The invention discloses a water outlet assembly and a water outlet device. The water outlet assembly comprises a body, the body is provided with a first water outlet channel and a gas storage cavity, the first water outlet channel is provided with a first water outlet, the gas storage cavity is provided with a first through hole, and the first through hole is located at the front end of the first water outlet in the water flow direction; the first through hole is communicated with the gas storage cavity and the first water outlet channel so that water flow can extrude part of gas in the first water outlet channel into the gas storage cavity. By the adoption of the structure, when water flows through the first water outlet for the first time, due to the fact that the gas storage cavity contains a part of gas exhausted from the first water outlet channel, the amount of the gas exhausted from the first water outlet is reduced, and therefore disturbance caused to a water outlet column when the gas in the first water outlet channel is exhausted is reduced. Compared with the prior art, the structure that the air storage cavity is formed in the body is adopted, and the gargling experience of a user is improved.

The invention discloses a hydraulic system pressure pulse suppression device which comprises a shell, a hydraulic system pressure pulse suppression device and a hydraulic system pressure pulse suppression device. A center cavity is formed in the shell, and an oil inlet and an oil outlet are formed in the two sides of the center cavity respectively; the input pipe is arranged outside the oil liquid inlet, the input pipe is used for feeding hydraulic oil into the central cavity, and an output pipe is arranged at the oil liquid outlet; the outer pipe seat is arranged on the shell and is positioned on one side of the oil liquid inlet; the damping pipe is coaxially arranged in the central cavity; the sealing seat is fixed on the shell and is positioned on one side of the oil liquid outlet; the bypass ports are distributed at one end, close to the damping pipe, of the straight pipe in a circumferential array manner; the modulation unit is coaxially arranged between the outer tube seat and the shell; the damping pipe can be matched with the shell to form a circulation channel and a direct flow channel, and in hydraulic system pulse suppression, the damping device can be adaptively adjusted, so that the circulation channel or the direct flow channel is adopted as a main flow channel to form two different oil feeding modes, and the damping device adapts to different hydraulic working conditions.

The invention discloses a high-thermal-conductivity and high-uniform-temperature microchannel structure and a processing method thereof.A microchannel heat sink and an acrylic cover plate above the microchannel heat sink are arranged, a contraction flow channel is embedded in the acrylic cover plate, the height of the contraction flow channel is gradually decreased from the inlet end to the outlet end, and the main body material of the microchannel heat sink is a diamond / copper composite material; due to high thermal conductivity, the diamond / copper-based micro-channel can greatly reduce the temperature of the chip in the working process, and the contraction type micro-channel can improve the flow velocity of the outlet side, enhance the heat exchange effect, reduce the temperature difference between the inlet and the outlet and enhance the temperature uniformity. The magnetron sputtering polytetrafluoroethylene can make the acrylic flow channel hydrophobic and reduce the flow resistance, so that the design of the micro-channel integrates high heat dissipation, high temperature uniformity and low flow resistance, and the overall heat exchange performance of the existing micro-channel is improved.

The utility model discloses an injection mold for producing a display panel. The injection mold comprises a top plate, a pouring nozzle, an upper mold plate, a lower mold plate, a bottom plate, an ejector pin mechanism and an ejector pin plate, a mold cavity insert is arranged at the bottom of the upper mold plate, a mold core insert is arranged at the top of the lower mold plate, and two symmetrically arranged molding holes are formed between the mold cavity insert and the mold core insert. According to the utility model, the two symmetrically arranged molding holes are arranged in the injection mold, so that the injection mold can simultaneously produce two curved-surface display panels during one-time mold opening and closing, and the production efficiency is high; meanwhile, the cross section of the mold core insert is of a V-shaped structure, and the middle part of the mold core insert is provided with the pouring channel for communicating the two forming holes, so that the molten plastic raw material can be uniformly conveyed and filled in the forming holes, and the mold core insert of the V-shaped structure can increase the flowing resistance of the plastic raw material so as to slow down the flowing speed of the plastic raw material; therefore, bubbles are reduced, and the product quality is improved.

The invention belongs to the technical field of engines, and discloses a rotary detonation combustion chamber which comprises a combustion chamber body, the combustion chamber body comprises a combustion chamber shell composed of an inner sleeve structure and an outer sleeve structure, a fluid channel is formed in the combustion chamber shell, and the inlet end of the fluid channel is a combustion chamber air inlet; the fluid channel comprises a combustion chamber throat section, a first expansion section, a U-shaped groove section, a second expansion section and a combustion chamber downstream straight section which are sequentially arranged. One end of the combustion chamber throat section communicates with the combustion chamber air inlet. And the U-shaped groove section comprises a U-shaped groove fillet section and a U-shaped groove straightway section which are arranged in sequence. The whole U-shaped groove fillet section is of a topological fluid diode structure, and one end, close to the first expansion section, of the topological fluid diode structure is of an arc-shaped structure. The topological fluid diode structure provides a new view angle and a new solution for optimization of the combustion chamber, and design and development of the more efficient and more stable combustion chamber are promoted.

The invention discloses a combined air preheater, wherein a hot flue gas inlet duct is connected with a cold flue gas outlet duct via a flue gas side rotary air preheater, a medium-temperature flue gas outlet duct, a medium-temperature flue gas inlet duct and a heat release side of a tubular air preheater system; a cold air inlet duct is connected with a hot air outlet duct via a heat absorption side of the tubular air preheater system, a medium-temperature air outlet duct, a medium-temperature air inlet duct and an air side rotary air preheater. The preheater can effectively increase the exhaust gas temperature at the rotary air preheater outlet, solve the problem of the influence of ammonium bisulfate ash blocking on the rotary air preheater, and has high safety and stability.

The invention relates to the technical field of cooling systems, and provides a passive cooling system which comprises a heat exchange device, a first pipeline and a separation box, the heat exchange device is used for carrying out heat exchange with seawater, the heat exchange device is connected with the separation box, and the heated seawater enters the separation box; the first pipeline is connected with the separation box, and the first pipeline is used for discharging the heated seawater; a partition plate is arranged in the separation box and used for preventing steam bubbles from flowing along the first pipeline. According to the passive cooling system, by arranging the partition plate in the separation box, a steam-water mixture can be separated by utilizing buoyancy force and the partition plate, so that steam is gathered at the top of the separation box, and liquid is gathered at the bottom of the separation box, so that the liquid is discharged from the first pipeline, and the steam in the first pipeline is prevented from being directly contacted with backflow supercooled seawater to cause condensation; and a water hammer is further induced.

The invention relates to a high-performance liquid cooling system for electric control equipment, which is characterized in that the upper end of a box body is provided with a capacitor cooling flow channel, the left end of the capacitor cooling flow channel is connected with a first inlet connector, and a capacitor is arranged above the capacitor cooling flow channel; a power module cooling flow channel is arranged in the middle of the box body, the left end of the power module cooling flow channel is connected with a second inlet connector, and a plurality of power modules are installed above the power module cooling flow channel; the lower end of the box body is provided with an inductor cooling flow channel, the right ends of the power module cooling flow channel and the capacitor cooling flow channel converge and are communicated with the right end of the inductor cooling flow channel, the left end of the inductor cooling flow channel is connected with a first outlet connector and a second outlet connector in parallel, and an inductor is installed above the inductor cooling flow channel. The capacitor, the inductor and the box body are integrated through glue pouring to form closer contact, and higher heat dissipation efficiency is achieved; the power module is fixedly arranged in the box body and then becomes a part of the flow channel to directly participate in heat dissipation, so that higher heat dissipation efficiency is achieved, and the liquid cooling efficiency of the electric control equipment is improved.

This invention provides a coolant flow channel plate, relating to the technical field of vehicle thermal management. It includes a cover plate fixed to the top of a main board, with the main board and cover plate welded together at their side edges to form an internal flow channel cavity. The cover plate has refrigeration unit inlet / outlet assemblies on its surface. The main board has, from left to right, a heater pump mounting port, a battery pump mounting port, and a motor pump mounting port. The circuits between the heater pump and battery pump mounting ports, and between the heater pump and motor pump mounting ports, within the internal flow channel cavity are each equipped with a first anti-heat-spreading section. The circuit between the motor pump and battery pump mounting ports forms a variable-diameter section, with a second anti-heat-spreading section at its front end. A guide section is provided on the circuit of the battery pump mounting port. This invention solves the problem of lacking anti-heat-spreading structures at the connection points of circuits in different temperature ranges, achieving the technical effects of reducing vehicle weight, reducing vehicle connection piping, reducing heat loss in the thermal management system, and improving thermal management efficiency.

The utility model relates to an emergency ejection buoy positioning device based on a shallow sea area AUV (Autonomous Underwater Vehicle) experiment. Comprising an ejection buoy, a fishing line, an executing mechanism and a fixing structural part. One end of the fishing line is connected to the ejection buoy, the other end of the fishing line is connected to the fixing structural part, the ejection buoy is fixed to the device through the executing mechanism and the fixing structural part, and a push-pull electromagnet in the executing mechanism is controlled through the main control circuit. The whole device is installed on the AUV, the influence on the balancing condition of the AUV is small, the device can dive into water along with the AUV, the influence on the resistance of the AUV is small, the device can continuously work for a long time, the device is independent of the AUV, good compatibility is achieved, and the device can be applied to AUVs of multiple varieties and different models. After the device is operated, the ejection float floats on the water surface, GPS positioning information is sent to search and rescue personnel, the search and rescue personnel find the AUV after finding the ejection float, and the AUV can be positioned when the AUV works in a shallow sea area and cannot be found.

This invention discloses a continuous adsorption-desorption treatment device for organic waste gas, relating to the field of environmental engineering construction technology. It includes: a support, on which multiple alternating treatment modules for treating organic waste gas are mounted; each treatment module includes: a treatment cylinder fixed to the support, an inner cylinder fixed inside the treatment cylinder, a main support mesh and multiple secondary support meshes fixed inside the inner cylinder, the main support mesh being located below all the secondary support meshes, and an activated carbon layer placed on the upper side of both the main and secondary support meshes, with gaps between the secondary support meshes and the activated carbon layer below them; and arc-shaped through holes at positions corresponding to these gaps on the inner cylinder. This invention utilizes the arc-shaped through holes to provide an additional flow path for the desorbed gas, allowing it to directly pass over the already desorbed activated carbon, reducing heat exchange between the desorbed gas and the desorbed activated carbon, thereby reducing heat loss and improving desorption efficiency.

The range hood comprises a volute and a liquid receiving disc, a first liquid leakage opening is formed in the bottom of the volute, the liquid receiving disc is arranged below the volute and suitable for receiving liquid flowing out of the first liquid leakage opening and blocking airflow flowing out of the first liquid leakage opening, the liquid receiving disc is provided with a second liquid leakage opening, and the second liquid leakage opening and the first liquid leakage opening are arranged in a staggered mode. When the range hood is in a greasy dirt cleaning state, liquid can enter the liquid receiving disc through the first liquid leakage opening and is discharged through the second liquid leakage opening, and when the range hood is in a normal oil smoke exhausting state, due to the fact that the first liquid leakage opening and the second liquid leakage opening are designed to be arranged in a staggered mode, the liquid leakage opening is not prone to falling off. The air flow flowing out of the first liquid leakage port collides with the liquid receiving disc and cannot be directly discharged through the second liquid leakage port, so that the resistance of the air flow passing through the first liquid leakage port is increased, the leakage degree of the air flow in the volute from the first liquid leakage port is reduced, the interference to the main air flow of the range hood is prevented, and the service life of the range hood is prolonged. In this way, the requirement for discharging liquid during cleaning can be met, and noise generated during smoke pumping and discharging is effectively reduced.

The heat exchanger comprises a first plate sheet and a second plate sheet, a first inter-plate channel is formed between the first plate sheet and the second plate sheet, the first plate sheet comprises a plurality of first protruding parts and a first base plate, and the first protruding parts protrude towards the second plate sheet relative to the first base plate; the first plate sheet comprises a first rib part and a connecting part, the first rib part extends from one end part of the first plate sheet to the other end part of the first plate sheet, and the first rib part protrudes towards the second plate sheet relative to the first substrate; the multiple first protruding parts adjacent to the first rib parts are defined as a first protruding part set, the connecting parts are located between the first rib parts and the first protruding part set in the width direction of the heat exchanger, the connecting parts protrude towards the second plate piece relative to the first base plate, and the first protruding parts are close to the second plate piece relative to the connecting parts. The flow resistance of the inter-plate channel between the first rib part and the first convex part group can be relatively increased, the heat exchange area of the inter-plate channel is increased, and the heat exchange efficiency is improved.

The invention discloses a copper pipe coiling device for medical cabinet production, and particularly relates to the technical field of copper pipe coiling, the copper pipe coiling device comprises a supporting frame, an operation table is fixedly connected to the upper end of the supporting frame, baffles are fixedly connected to the upper end of the operation table in a bilateral symmetry mode, and coil adjusting assemblies are jointly arranged at the ends, close to each other, of the two baffles; a cleaning assembly is arranged on the front portion of the upper end of the operation table. According to the copper pipe coiling device for medical cabinet production, by arranging the adjusting mechanism and the fixing mechanism, corresponding adjustment can be carried out when the copper pipes with different diameters are used, the copper pipes are prevented from being too tight or too loose, uniform and flat coiling is guaranteed, the copper pipe coiling device can also adapt to copper pipes with different specifications or lengths, and the copper pipe coiling device is convenient to use. According to the copper pipe coiling device, the coiling space and the coiling efficiency are optimized, copper pipes are prevented from being deformed, extruded or dislocated in the coiling process, the production stability and the product quality are improved, and when copper pipes with different diameters are fixed, the coiling diameter can be adjusted according to the different diameters.

The invention provides a bending-torsion composite shock absorber structure of a rotor system and a shock absorption method of the bending-torsion composite shock absorber structure, and relates to the technical field of bending-torsion composite shock absorption. According to the bending and twisting composite shock absorber structure of the rotor system and the shock absorption method of the bending and twisting composite shock absorber structure, the bending and twisting composite shock absorber structure of the rotor system comprises a mounting outer disc, a plurality of damping shock absorbers and an outer support, the damping shock absorbers are mounted in the mounting outer disc and distributed in a circumferential array mode, and the outer support is mounted on the inner sides of the damping shock absorbers; the driving disc assembly comprises a driving disc body, a plurality of key grooves used for being connected with a driving shaft of the rotor system are formed in the outer surface of the driving disc body, a friction plate is fixedly connected to the center of the front side wall of the driving disc body, and a connecting circular ring is fixedly connected to the position, located on the outer side of the friction plate, of the front side wall of the driving disc body. The distance between the two movable limiting blocks is adjusted, so that the relative rotation angle of the driving disc and the driven disc is changed, and then different working conditions and load changes are adapted.

The application relates to the technical field of sealing joints, in particular to a sealing joint for a high-pressure hydrogen gas conveying pipeline, which comprises a male connector seat, a female connector seat and a valve core group, the joint ends of the male connector seat and the female connector seat are respectively provided with lock plates and flange joint plates, the outer periphery of the flange joint plate is provided with wedge locking blocks and screw rods, the opposite surfaces of the lock plate and the flange joint plate are respectively provided with first sealing ring groups and second sealing ring groups, the surface of the lock plate is provided with a sealing gasket, the valve core group comprises a core shaft, a spring, a valve sleeve and a guide head, and a gradually tapered section, a throat section and a gradually expanded section flow channel structure are formed between the valve sleeve and a flow channel. The male connector seat and the female connector seat are quickly locked and connected through the wedge locking blocks, a composite sealing structure is formed through labyrinth sealing and elastic sealing, the static pressure of a joint jointing area is reduced through the Venturi effect, the hydrogen gas leakage driving force is reduced, a multilayer leakage prevention mechanism is formed, and the sealing joint has the advantages of good sealing performance, high connection stability and suitability for high-pressure hydrogen gas conveying working conditions.

The application discloses a novel fuel cell graphite bipolar plate with anti-overflowing glue, wherein the inner and outer sides of the sealing groove structure are provided with first glue overflow grooves parallel to the sealing groove; the inner side of the bipolar plate edge is provided with a second glue overflow groove; the second glue overflow groove surrounds the bipolar plate edge; a third glue overflow groove is arranged between the first glue overflow groove on the outer side of the sealing groove and the second glue overflow groove and close to the bipolar plate edge; a fourth glue overflow groove is arranged between the second glue overflow groove and the bipolar plate edge; one end of the fourth glue overflow groove is communicated with the second glue overflow groove, and the other end is provided with a glue overflow opening; the first glue overflow groove, the third glue overflow groove, the second glue overflow groove and the fourth glue overflow groove form a buffer extension path; when the excess glue passes through the glue overflow grooves, the flow resistance is increased, and the glue discharge speed is significantly slowed down. This avoids the rapid flow of the glue out of the bipolar plate, reduces the pollution of the glue overflow to the production environment and other components, and reduces the production interruption and material waste caused by cleaning the glue overflow.

This invention provides a method for determining the oil level of a compressor and an air conditioning system. The compressor has an oil sump, and a throttling element and a liquid temperature sensor are sequentially installed at the outlet of the oil sump. The liquid temperature sensor is used to measure the temperature Tk of the fluid flowing out of the oil sump after being throttled by the throttling element. The method includes: acquiring the compressor's high-pressure Ph, low-pressure Ps, discharge temperature Tp, and fluid temperature Tk; determining the compression ratio Px based on the high-pressure Ph and low-pressure Ps; calculating the predicted oil temperature Tkcal of the compressor based on the compression ratio Px, discharge temperature Tp, and low-pressure Ps; calculating the difference ΔT between the predicted oil temperature Tkcal and the fluid temperature Tk, and comparing the difference ΔT with preset dynamic parameters; and determining whether the compressor's oil level is qualified based on the comparison result of the difference ΔT and the dynamic parameters. The control method of this application is simple, convenient, reduces manual intervention, and has high accuracy.

The application discloses a zinc-bromine single liquid flow battery and belongs to the technical field of liquid flow battery energy storage, wherein the zinc-bromine single liquid flow battery is a single battery or a battery pack formed by connecting two or more single batteries in series, and the single battery mainly comprises a negative electrode frame, a negative carbon felt electrode arranged in a through hole in the middle of the negative electrode frame, a diaphragm, a positive carbon felt electrode arranged in a through hole in the middle of a positive electrode frame and the positive electrode frame which are sequentially stacked. The application reduces the flow radius of the electrolyte inlet flow channel, the inlet distribution flow channel, the outlet flow channel and the outlet distribution flow channel of the positive electrode frame, increases the flow resistance of the positive electrode frame, and solves the problems of low coulomb efficiency and short cycle life of the zinc-bromine single liquid flow battery caused by the expansion of the positive bromine during the operation of the zinc-bromine single liquid flow battery.

The invention relates to the field of packaging materials, in particular to a plastic packaging material and a preparation method and application thereof. The plastic packaging material comprises the following raw materials in parts by mass: 80-120 parts of polyethylene, 10-20 parts of a modified filler, 15-25 parts of a fiber material, 2-8 parts of a plasticizer, 4-10 parts of a flexibilizer, 1-5 parts of a stabilizer and 1-10 parts of an auxiliary agent. The prepared plastic packaging material not only has excellent temperature resistance and processability, but also can comprehensively improve the water resistance, corrosion resistance, aging resistance, mechanical properties and other properties of the packaging material, can be effectively used as a raw material for preparing woven bags used in high-humidity, high-corrosion, high-temperature and other environments, has very excellent market use prospects, and is worthy of popularization and application. And a new solution thought is provided for the technical problem.

The present application relates to a kind of sintering machine composite side sealing device, the present application is provided with two sealing structures in the side of sintering machine, respectively contact type equidistant slide sealing assembly and telescopic spring support plate contact sealing assembly.Equidistant slide sealing assembly of contact type relies on the mutual cooperation between upper and lower slide structure, forms close horizontal surface contact and circuitous labyrinth structure, can change the flow direction of wind, increase the flow resistance of wind.Telescopic spring support plate contact sealing assembly mainly relies on spring compression to make sealing plate and L type plate surface close contact, in the sintering process, L type plate is moving, in order to reduce the friction of contact surface, a self-lubricating system is designed, so that the contact surface is in lubricated state, can reduce wear, prolong the service life of device.Therefore, the whole side sealing device has higher practical value.

This application relates to a heat exchanger and a thermal management system. The heat exchanger includes a flow guide plate with first flow guide grooves. Adjacent first flow guide grooves form multiple flow splitting gaps. The first flow guide groove is formed by either a straight groove segment or a curved groove segment alone, or by alternating arrangements of both. The straight groove segment includes multiple staggered channels connected sequentially along its own centerline, with adjacent staggered channels arranged in a direction perpendicular to the centerline of the straight groove segment. The flow guide plate also has multiple second flow guide grooves and flow guide protrusions. The flow guide protrusions divide the area of ​​the cold flow channel layer between the first and second flow guide grooves into multiple flow guide channels. The flow area of ​​the flow guide channels, the flow area of ​​the first flow guide groove, and the flow area of ​​the second flow guide groove are all equal. The heat exchanger and thermal management system provided by this application solve the problem of thermal stress concentration in the heat exchanger caused by inconsistent heat exchange effects at different locations in the cold flow channel layer.

The invention discloses a noise reduction structure and a range hood comprising the noise reduction structure, the noise reduction structure is arranged in a case of a fan system, the noise reduction structure is arranged at a volute tongue of a volute of the fan system, the noise reduction structure is provided with a noise reduction cavity in a penetrating mode in the axial direction of the volute, and the noise reduction cavity is communicated with the volute tongue of the volute. The noise reduction cavity communicates with the first air inlet area and the second air inlet area of the volute, and the cross section area of a cavity of the noise reduction cavity accounts for 20%-35% of the cross section area of the noise reduction structure. The noise reduction structure is arranged at the volute tongue, so that the operation noise of the fan system is reduced. By arranging the noise reduction cavity, the first air inlet area and the second air inlet area are communicated through the noise reduction cavity, the flowing resistance of airflow is improved, the adverse effect of the noise reduction structure on the flowing state in the case is weakened, and the inner wall of the noise reduction cavity can also be used for absorbing noise; in this way, the noise reduction effect is improved, and the aerodynamic performance of the fan system is guaranteed by increasing the sound absorption area of the noise reduction structure.

The utility model discloses a leakage-preventing bearing device and a fan, and belongs to the technical field of bearing sealing. A rotating shaft; the bearing is mounted in the bearing box, and the rotating shaft is sleeved with the bearing; the bearing side cover is used for sealing the bearing in the bearing box, the inner edge of the bearing side cover sleeves the rotating shaft and is sealed with the rotating shaft, and the outer edge of the bearing side cover is fastened on the bearing box; wherein the inner edge surface of the bearing side cover is provided with a sealing groove which is annularly arranged along the circumferential direction, the outer circumference of the rotating shaft is annularly provided with a bulge, and the bulge is matched with the sealing groove so as to form a sealing channel which is bent along the extending direction of the rotating shaft; the fan comprises the bearing device capable of preventing leakage. The problem of oil leakage at the bearing sealing position can be solved, the effective sealing effect is ensured, the bearing locking fault in the bearing box is avoided, and it is ensured that normal production is not affected.

The utility model relates to the field of heat pipe waste heat recoverers convenient to clean, and discloses a heat pipe waste heat recoverer convenient to clean, which comprises a main body, a tank body is fixedly arranged at the upper end of the main body, an air inlet pipe is fixedly arranged at one end of the main body, an air outlet pipe is fixedly arranged at the other end of the main body, and a water inlet pipe is fixedly arranged at one end of the tank body. A water outlet pipe is fixedly arranged at the other end of the tank body, a filtering mechanism is arranged on the outer side of the water inlet pipe in a threaded mode, the main body comprises a first shell, a plurality of baffles are fixedly arranged on the inner side of the first shell, and the tank body comprises a second shell. According to the utility model, the main body mainly plays a role in fixing and facilitates the installation of an internal mechanism, the tank body facilitates the storage of water, hot air is conveyed into the mechanism from the air inlet pipe and discharged from the air outlet pipe, the water is conveyed into the tank body through the water inlet pipe to be heated, and the heated water is discharged through the water outlet pipe. And the filtering mechanism is convenient for filtering water conveyed into the tank body.

The anti-recoil device comprises a shell, a first braking cavity, a second counter-recoil cavity and a third counter-recoil cavity, the shell is installed at the top of a gun barrel, the first braking cavity is formed in the middle of the shell, and the second counter-recoil cavity and the third counter-recoil cavity which are located on the left side and the right side of the first braking cavity respectively are formed in the shell. Traveling pistons are arranged on the inner sides of the second counter-recoil cavity and the third counter-recoil cavity; a pull rod piston is arranged on the inner side of the first braking cavity, a first recoil valve and a first counter-recoil valve are arranged between the first braking cavity and the second counter-recoil cavity, a second recoil valve and a second counter-recoil valve are arranged between the first braking cavity and the third counter-recoil cavity, and inclined partition plates are arranged on the inner side of the second counter-recoil cavity and the inner side of the third counter-recoil cavity. The anti-recoil device of the artillery is arranged at the top of the artillery barrel, so that the torsion of the artillery carriage during recoil and counter-recoil of the artillery is reduced, the deviation degree of an aiming line is reduced, and the continuous shooting of the artillery is facilitated.