76 results about "Convective cooling" patented technology

A seat can provide improved ventilation to a seat occupant. The seat can have a seat body including a core and an outer cover defining an outer surface of the seat. A flow passage can be defined in the seat body. The flow passage can include an opening defined in the outer cover. The portion of the seat body including the opening can be caused to move away from a seat occupant. Thus, convective cooling can be provided to the seat occupant in a region corresponding to the portion.

The invention discloses a compression system end area flow regulation and control method based on blade inner cooling under a low Reynolds number. Firstly, through calculation or measurement, a compression system end area three-dimensional flow field under different Reynolds numbers is obtained, and the end area loss variation degree is quantified. Then, revealing regulation and control rules of different isothermal cooling wall surface conditions on near-wall fluid physical property parameters, boundary layer growth rate and end region secondary flow migration intensity under a low Reynolds number, and establishing a correlation model of end region loss reduction and efficiency improvement and wall surface cooling intensity; and on the basis, a blade built-in convection cooling channel structure is designed, the cooling channel and blade surface flow heat characteristics are analyzed based on a conjugate heat transfer method, and inner cooling channel structure parameters are optimized until the wall surface temperature drop amplitude meets the preset requirement. And finally, checking the wall surface cooling effect, and measuring end region performance parameters during inner cooling regulation and control under a low Reynolds number to complete scheme verification. By introducing blade inner cooling, the flow characteristic of an end region can be remarkably improved on the premise that the structural complexity is not increased as much as possible, and stable and efficient operation of a compression system under the low Reynolds number is guaranteed.

The invention relates to the technical field of casting, in particular to automobile part casting equipment which is composed of a casting main unit, a casting turnover equipment unit and a cooling conveying unit. The casting main unit comprises a casting operation platform, a forming die and a casting press-fit assembly, and press-fit forming of castings is achieved. The casting turnover equipment set drives a casting grabbing mechanical arm through a lifting module device and a displacement module device, castings are automatically transferred, and the castings are shaped through an upper plate face rolling device at the output end of a turnover workbench. In the cooling conveying unit, array cooling air boxes at the top of a cooling box body perform air cooling from top to bottom, a lower plate surface rolling device is integrated with a secondary cooling box to supply air from bottom to top, and convection cooling is formed; and the rolling device also shapes the lower plate surface of the casting, and the shaped casting is conveyed to the cache storage area through the second conveying workbench. The equipment is designed according to the characteristics that metal plate castings are light, thin and easy to deform, the whole process of casting, transferring, cooling and temporary storage is automatically completed, the surface quality and size precision of the castings are effectively improved, and the rejection rate is reduced.

Devices, systems, and methods to air cool a portable generator are disclosed. The devices include various air ducts to direct airflow over heated components within a cabinet of the portable generator to cool the components by convection. A damping fan draws ambient temperature air into the cabinet and directs the air into channels of an outflow duct.

The invention relates to a turbomachine with a housing and a shaft rotating therein, wherein the shaft is sealed against the housing by means of at least one mechanical seal and a swirling flow of a working fluid located in the region of the mechanical seal is generated by the rotation of the shaft, characterized in that in the immediate vicinity of the mechanical seal at least one drive component driven by the shaft is provided for generating a secondary flow superimposed on the fluid flow in the region of the mechanical seal for convection cooling of the mechanical seal.

This application relates to the field of refrigeration equipment technology, and more particularly to a refrigerator. In the refrigerator of this embodiment, under the action of a first fan, cold air from the evaporator chamber enters the first refrigerator compartment through the air supply duct; a portion of the air in the first refrigerator compartment enters the return air duct through the second return air inlet, and then returns to the evaporator chamber, utilizing air convection to lower the temperature of the first refrigerator compartment. By setting an air outlet on the middle partition, another portion of the air from the first refrigerator compartment enters the second refrigerator compartment through the air outlet; the air in the second refrigerator compartment enters the return air duct through the first return air inlet, and then returns to the evaporator chamber. Utilizing the return air from the first refrigerator compartment to the second refrigerator compartment causes cold air to circulate, achieving convective cooling. Moreover, the return air duct is formed within the duct assembly inside the refrigerator compartment, eliminating the need for an additional return air duct on the outside of the refrigerator compartment, thereby reducing the thickness of the insulation layer at the rear of the refrigerator compartment. This allows for an increase in the refrigerator's volumetric efficiency without changing the overall dimensions of the refrigerator.

According to the energy-saving explosion-proof lamp, a mounting block is fixedly connected to the middle of the top of a shell, a lamp panel is fixedly connected to the lower portion of the interior of the shell, a mounting cover is fixedly connected to the top of the shell, an electric push rod moves upwards, a movable pipe makes contact with the top of a movable air bag, and the movable air bag is pushed after being extruded by the electric push rod; the first blocking rod and the second blocking rod are separated from the movable air bag and the closed air bag, air enters the movable air bag and the closed air bag, airflow in the heat dissipation box is exhausted, then the electric push rod extrudes downwards, the movable air bag and the closed air bag extrude, and then the airflow is sprayed out, so that cold air is distributed in the explosion-proof lamp for cooling. When the electric push rod drives the movable pipe to move upwards, airflow cavity change is formed through compression, the movable air bag and the closed air bag, the circulation process of one-way air inlet and directional air exhaust is achieved, and the airflow generated in the extrusion process can efficiently conduct convection cooling on low-temperature air in the heat dissipation box.

The application discloses a high-temperature superconducting conductor and a preparation method thereof, and relates to the technical field of high-temperature superconductivity, wherein the conductor comprises an inner pipe body and an outer pipe body arranged coaxially, a liquid nitrogen convection cooling zone is formed in the inner pipe body, and a vacuum heat insulation cavity is formed between the inner pipe body and the outer pipe body. By forming the liquid nitrogen convection cooling zone in the inner pipe body and the vacuum heat insulation cavity between the inner pipe body and the outer pipe body, the liquid nitrogen can directly soak the superconducting cable for efficient heat exchange, the vacuum heat insulation cavity effectively blocks the radial conduction of environmental heat to the inner pipe body, and the heat load of the refrigeration system is greatly reduced; by electrically connecting the low-temperature end electrode and the superconducting cable and connecting the room-temperature end electrode and the low-temperature end electrode in series to form a loop, the room-temperature end electrode is avoided from directly contacting the superconducting cable, the axial heat leakage along the electrode is reduced, and one end of the liquid nitrogen cooling pipe is communicated with the inner pipe body and the other end of the liquid nitrogen cooling pipe extends to the outside through the outer pipe body, so that the stable supply and the sealing reliability of the liquid nitrogen are ensured.

The invention relates to a device (1) and a method for convectively cooling hot steel products, in particular hot rolled products (5) in a rolling mill. The device (1) comprises at least one cooling bed which comprises at least one first and at least one second vertically extending cooling bed plane (2, 3), wherein the cooling bed planes (2, 3) are formed by at least one transport device which has at least one vertical conveyor means (4) that is designed to receive a rolled product (5) from a first horizontal conveyor means (6), raise the rolled product via a first vertical conveyor section, and deposit the rolled product on a second horizontal conveyor means (4) via a second vertical conveyor section. The circulating transport device is arranged in a substantially closed housing (7) which comprises means for producing a flow of air and / or gas, as a cooling medium, through the volume enclosed by the housing (7) and means for recovering energy from the air flow and / or gas flow which is guided through the housing and which is loaded with heat of the rolled product.

Method for operating a device (1) for exhaust gas turbocharging of an internal combustion engine (2), in which the mechanical power provided by the exhaust gas turbine (13) is split to operate, in addition to the charging compressor (23), a cooling device (4) for cooling the exhaust gas mass flow of the internal combustion engine (2). The cooling device (4) provides a cooling air mass flow by means of a cooling compressor unit (14) driven by the mechanical power of the exhaust gas turbine (13) and supplies the cooling air mass flow to a heat exchanger device (24) arranged at least partially upstream of the exhaust gas turbine (13) and / or at least partially on the exhaust gas turbine (13) and / or at least partially downstream of the exhaust gas turbine (13).The cooling air mass flow directed to the heat exchanger device (24) can be adjusted by means of a controllable valve device (34), so that the temperature of the exhaust gas mass flow can be reduced in a targeted manner both by drawing the drive power for the cooling compressor unit (14) and by the convection cooling of the heat exchanger device (24).

The invention belongs to the technical field of quenching media, and relates to a low-cooling-speed water-based quenching agent suitable for wear-resistant cast iron as well as a preparation method and an application method of the low-cooling-speed water-based quenching agent. The low-cooling-speed water-based quenching agent which takes polyvinyl pyrrolidone with medium and low molecular weight as a main raw material and is suitable for the wear-resistant cast iron is obtained, and all the components are specifically limited, so that the water-based quenching agent can be effectively applied to quenching heat treatment of the wear-resistant cast iron after being compounded with water; accurate slow-speed control in the convection cooling stage is achieved, the anti-corrosion performance of workpieces and equipment in the quenching process and subsequent procedures is guaranteed, the stability in long-term use is guaranteed, it is guaranteed that all performance indexes such as rust resistance, foam resistance, biological stability and the pH value of the quenching liquid are kept stable in long-term use, and the service life of the quenching liquid is prolonged. The harsh requirements of industrial continuous production are met.

The invention discloses a reactor base slow positron source, a control method and a reactor and belongs to the field of nuclear power. The stack-based slow positron source comprises a slow positron generating assembly, an outer sleeve, a heavy water tank sleeve and a sealing assembly; the outer sleeve is inserted into the heavy water tank through the heavy water tank sleeve, and the tail end of the outer sleeve is immersed in the heavy water; the slow positron generation assembly is arranged at the tail end of the outer sleeve and is sealed in the outer sleeve; the sealing assembly comprises a heavy water sealing mechanism and a light water sealing mechanism, the heavy water sealing mechanism seals a gap between the heavy water tank sleeve and the outer sleeve, and the light water sealing mechanism seals a gap in the pool wall sleeve. The stack-based slow positron source can cool the slow positron generation assembly through heavy water convection, effectively improves the heat dissipation efficiency, and improves the upper limit of the slow positron beam intensity.

A system and method enabling the use of convection cooled dual-inline memory modules (DIMM) in non-convection environments, specifically used for computing applications for harsh environments. This system and method describes a design which transfers heat from the various components on the memory module to thermally opportunistic areas of an enclosure in the absence of sufficient or in some cases any convective cooling conditions. The system and method describes a sandwiched metal heat plate assembly, being constructed from a thermally conductive material, which is attached to a heat pipe, designed to be highly thermally conductive, which is further attached to a thermally conductive cold plate saddle, which in turn is connected to a thermal sink. The heat generated in the DIMM is conducted to the heat plate by way of a thermal interface material, this energy transferred to the heat pipe, and then to a cold plate which dissipates the energy to the ambient environment. The system does not require a plurality of fins inside the enclosure, liquid cooling, nor airflow within the enclosure to accomplish the memory thermal management. The invention includes a heat pipe saddle, a heat pipe, a clamshell heat extraction mechanism in conjunction with a thermal interface compound for improving the heat transfer from the DIMM to the heat sink.

The invention discloses a turbocharger heat insulation cover with a self-adaptive heat preservation structure, relates to the technical field of turbochargers, and aims to solve the technical problems that an existing turbocharger heat insulation cover belongs to passive heat protection, the heat insulation performance is fixed, and the rapid warming-up requirement and the high-temperature efficient heat insulation and heat dissipation requirement are difficult to consider at the same time. Comprising a turbocharger body with a turbine shell and a heat insulation mechanism wrapping the turbine shell. Dynamic adjustment can be realized through real-time temperature monitoring; in the heat preservation mode, the temperature control heat insulation modules are gathered to form a closed heat insulation cavity to achieve efficient heat preservation; in the active heat dissipation mode, negative pressure is formed through unfolding to drive the mild heat insulation module to suck cold air for primary heat exchange, then positive pressure is formed through gathering to drive the temperature control heat insulation module to exhaust high-temperature waste gas, and the breathing action is simulated to achieve efficient forced convection heat dissipation. In the long-term heat dissipation mode, the temperature control heat insulation module is unfolded again to form a direct heat dissipation gap, and continuous convection cooling is achieved.

The embodiment of the invention relates to the technical field of heat exchange, in particular to a data machine room refrigerating system which comprises an indoor unit and an outdoor unit which are connected through a pipeline. The indoor unit comprises a micro-channel evaporator used for convection refrigeration, a plate-type evaporator used for radiation refrigeration and an evaporation fan, the micro-channel evaporator is arranged towards the air inlet side of the evaporation fan, and the plate-type evaporator is located on the side of the micro-channel evaporator and the evaporation fan. And the micro-channel evaporator and the plate-type evaporator are internally provided with evaporation paths from top to bottom. In this way, the refrigerating system of the data machine room can achieve a better temperature control effect, load fluctuation of the compressor is reduced, and the overall energy efficiency ratio and operation reliability of the system are remarkably improved.

The present application relates to the technical field of welding control, and particularly relates to a processing system of a radar cover forming die, which comprises a temperature tracking module, a first ring gap formed by cooperation of a first die segment and a second die segment at a bottom end, a circle of detachable thermocouple arrays arranged on an outer surface of a male die corresponding to the first ring gap in a circumferential direction, each thermocouple measuring point corresponding to a to-be-welded point, and a space temperature sensor arranged at the center of a bottom plate in a cavity of the male die; an execution module used for welding the to-be-welded ring gap; a control module connected with the temperature tracking module and the execution module, respectively, based on collected data of the temperature tracking module to control and map the welding point; the welded area can complete heat conduction and convection cooling, so as to reduce deformation caused by temperature gradient. Compared with a traditional method of fixed sequence or experience jump welding, the assembly reference can be kept stable in the welding process, and the die thermal deformation caused by temperature concentration can be effectively slowed down.

A system (1) for cooling a refrigerant (R) for an aircraft comprising a plurality of ducts (2) for circulating the refrigerant (R) that are configured to be at least partially in contact with an airflow (A) so as to cool the refrigerant (R) through convection, the cooling system (1) comprising a safety heating device (3) extending internally inside at least one portion of the circulation ducts (2) so as to heat the refrigerant (R), a member (4) for measuring a physical parameter of the refrigerant (R) according to the flow rate of the refrigerant (R) in the circulation ducts (2) and a control member (5) configured to activate the safety heating device (3) when the measured physical parameter is below a predetermined threshold corresponding to a minimum flow rate of the refrigerant (R) in the circulation ducts (2).

The invention discloses an air cooling device and method for blast furnace molten iron sampling and rapid cooling. The air cooling device comprises a cylindrical main body; the sample placing cavity is formed in the middle of the cylindrical main body and is provided with a protective structure capable of being opened and closed, and the sample placing cavity is further provided with a bearing part; the input end of the air cooling channel is connected with external air source supply equipment, and air with preset pressure is conveyed through the two-way air flow channel, so that the cooling air is synchronously input from the two ends of the cylindrical main body and forms a hedging air flow field in the lofting cavity area, and the forced convection cooling of the sample is completed. The sample containing cavity in the middle of the cylindrical body provides a containing area for a molten iron sample, the two-way airflow channel penetrating through the two ends enables cooling gas to be synchronously input from the two ends, a hedging airflow field is formed in the sample containing cavity, the gas makes full contact with the sample, heat exchange is uniform, and composition segregation caused by too large local temperature difference is avoided; forced convection cooling is realized to quickly reduce the temperature of the sample.

The invention relates to a turbomachine with a housing and a shaft rotating therein, wherein the shaft is sealed with respect to the housing by means of at least one sliding ring seal, and by way of the rotation of the shaft a swirling flow of a working fluid located in the region of the sliding ring seal is generated, characterised in that in the direct surroundings of the sliding ring seal at least one drive component, driven by the shaft, is provided for generating a secondary flow overlaid over the fluid flow in the region of the sliding ring seal for convection cooling of the sliding ring seal.

The invention discloses a sealing butterfly valve and belongs to the technical field of butterfly valves, the sealing butterfly valve comprises a valve seat, a valve rod and a butterfly plate, the valve rod is provided with a first air channel and a first air inlet which are communicated, and an air inlet connector is arranged at the first air inlet; the butterfly plate is provided with a second air passage and a second air outlet which are communicated, the butterfly plate is connected with the valve rod, the first air passage is communicated with the second air passage, the butterfly plate comprises a sealing surface, and the butterfly plate is in sealing connection with the valve seat through the sealing surface; and the second air outlet is formed in the sealing surface. The through type gas cooling channel is formed by the valve rod and the butterfly plate, the second gas outlet is formed in the sealing face of the butterfly plate and serves as an outlet of the cooling channel to discharge a cooling medium so as to form active convection cooling, the cooling medium directly acts on a high-temperature area, namely, the area where the butterfly plate makes contact with a flow channel medium in the butterfly valve, and the heat dissipation efficiency is high; heat of the butterfly plate and the valve rod can be prevented from being transmitted to the actuator, and the service life of the actuator is prolonged.

Immersion cooling systems, apparatus, and related methods for cooling electronic computing platforms and / or associated electronic components are disclosed herein. An immersion cooling chassis includes a first face, a second face opposite the first face, a third face disposed between the first face and the second face, the third face perpendicular to the first face, a fourth face disposed between the first face and the second face, the fourth face perpendicular to the first face and opposite the third face, and a first portion to be cooled via a first convection of a coolant fluid, the first portion including a coolant inlet defined in the third face, and a coolant outlet defined in the first face, and a second portion to be cooled via a second convection of air, the second portion including an air inlet defined in the first face between the fourth face and the coolant outlet.

A power supply device includes a busbar that includes a support panel, a first busbar element extending along a first side of the support panel and a second busbar element extending along a second side of the support panel. The power supply device includes a shroud surrounding the busbar. The shroud includes shroud walls forming a busbar chamber receiving the busbar. The power supply device includes a heat exchanger coupled to the shroud. The heat exchanger includes an internal portion thermally coupled to the busbar. The heat exchanger includes an external portion exterior of the shroud cooled by convection cooling to dissipate heat from the busbar.

The invention provides a nuclear island cold end indirect air cooling device and method. The air cooling device comprises a first cooling mechanism and a second cooling mechanism which are arranged in series. The first cooling mechanism comprises at least one first cooling unit, and the first cooling unit adopts air forced convection cooling; the second cooling mechanism comprises at least one second cooling unit, and the second cooling unit adopts air forced convection cooling and water mist evaporative cooling; wherein the circulating water inlet pipeline is provided with a first branch flowing to the first cooling mechanism and a second branch flowing to the second cooling mechanism, and the circulating water inlet pipeline is configured to be capable of flowing through the first cooling mechanism and / or the second cooling mechanism for heat exchange and cooling; or the cooling water of the circulating water pipeline is fully bypassed.

The invention discloses a device for measuring the spraying oil cooling heat transfer coefficient of a motor stator winding, which comprises a sealed cavity, a cushion block is fixed in the center of the inner bottom surface of the sealed cavity, and a simulation winding is arranged above the cushion block; an oil outlet is formed in the side wall of the sealed cavity, an oil inlet is formed in the center of the top surface of the sealed cavity, a hose with a peristaltic pump is connected between the oil inlet and the oil outlet, and the peristaltic pump pumps cooling oil in the sealed cavity to the oil inlet and sprays the cooling oil on the simulation winding; a heating plate is attached to the simulation winding, the heating plate is connected with a power controller, and the power controller controls the output power of the heating plate; temperature sensors are respectively arranged on the surface of the heating plate and the bottom of the sealed cavity; and substituting the readings of the power controller, the temperatures of the simulation winding and the cooling oil and the surface area of the simulation winding into a Newton convection cooling law calculation formula to obtain a convection heat transfer coefficient of spray cooling of the motor stator winding. According to the invention, the convective heat transfer coefficient of spray cooling of the motor stator winding can be simulated and calculated, so that the jet impact enhanced heat transfer rule and characteristics can be explored.

Disclosed is a waterproof shoe with an improved ventilation mechanism, designed to circulate air from the outside environment through the shoe in order to provide convective cooling to a wearer's foot. In a desired embodiment, the shoe may incorporate a pump-ventilation mechanism which, coupled with airflow channels incorporated in the upper, acts to establish continuous substantially one-way airflow through the shoe in a heel-to-toe direction while a user walks.

The utility model provides a crystallized trehalose recrystallization device which comprises a rack and a crystallization kettle, the crystallization kettle is horizontally placed, stirring blades are arranged in the crystallization kettle, and materials are stirred by the stirring blades in the recrystallization process, so that the materials can be fully stirred, and the problem that the crystallization quality and efficiency are ordinary due to non-uniform stirring is solved. Flexible scrapers are arranged on the outer sides of the stirring blades, so that materials attached to the inner wall of the crystallization kettle can be effectively cleaned, crystallization materials are prevented from being accumulated on the inner wall of the crystallization kettle, efficient operation of equipment is further maintained, and the crystallization efficiency and the product quality are further improved. In addition, the first cooling pipe and the second cooling pipe which are spirally arranged on the outer side of the crystallization kettle realize efficient convection cooling through the water inlet and the water outlet in opposite directions, and uniform temperature distribution in the kettle is ensured, so that the crystallization effect is optimized, and the product purity is improved. And after the material crystallization is completed, the telescopic assembly drives the crystallization kettle to lift, so that the discharge port is positioned at a lower position, and the material can be discharged more easily.

The application relates to the technical field of heat treatment, and particularly discloses a heat treatment method for a super-large whole frame. The method comprises the following steps: preliminary annealing: placing a titanium alloy whole frame on a hollowed-out type tray, and keeping the temperature at 850 DEG C + / - 10 DEG C for 3-4 hours; pre-air cooling: transferring to an air cooling area within 150 seconds, and rapidly cooling to 600 DEG C through four corner air blowers and middle air blowers of four sides; strong air cooling: transferring to an air cooling rack, and forcibly cooling through circumferential air outlets of a middle air outlet platform; stress relief annealing: pressure block annealing at 560 DEG C + / - 10 DEG C; slow cooling: furnace cooling at <= 30 DEG C / h to below 300 DEG C, and then slow cooling to room temperature at <= 15 DEG C / h in an adiabatic box. Through stage cooling, tooling cooperation and block deformation inhibition, the application solves the warping problem of the titanium alloy whole frame, the warping amount is reduced by more than 90%, and the room temperature and high temperature mechanical properties are better than the technical standard.

A heat exchanger including resistive heaters, standoff conduits, and electrical conductors. Each resistive heater includes a heating element conduit and a resistive heating element. The heating element conduit includes fluid flowing therethrough. The resistive heating element is disposed within the heating element conduit. Each standoff conduit is disposed at an end of the heat exchanger opposite the resistive heater and is configured to provide thermal isolation and convective cooling from extreme process temperatures and be coupled to an electrical enclosure through means of an electrically isolating compression fitting feature, thereby accomplishing pressure boundary requirements and enabling easy field replacement of the element by end users. Each of the standoff conduits has an axial end that is fluidly sealed. Each electrical conductor extends through a respective standoff conduit and has a first end electrically coupled to a power supply and a second end electrically coupled to a respective resistive heater.

The invention relates to the technical field of temperature control, and discloses a temperature control method and system for a cold heading steel wire rod air cooling roller way. According to a phase change rule, dividing a phase change temperature interval of transformation of the current wire rod from an austenite structure to a pearlite / sorbite structure; dividing the target cooling path into a high-temperature section, a phase change section and a low-temperature section according to the phase change temperature interval; taking high-temperature section severe convection cooling control, phase change section isothermal control and low-temperature section low-stress slow cooling control as temperature regulation and control targets, and solving and generating an optimal sectional type cooling strategy; and the optimal sectional type cooling strategy is converted into a control instruction of a cooling execution mechanism, and the cooling execution mechanism is driven to act. The high-temperature section, the phase-change section and the low-temperature section are accurately divided according to the phase-change temperature interval, the targeted temperature regulation target is set by combining the characteristics of all the stages, and refined control over the cooling process can be achieved.

The utility model discloses a flexible plate printing machine center large roller cooling structure which comprises an outer roller shaft, a cooling cavity is formed in the outer roller shaft, a framework layer is arranged in the center of the cooling cavity, an outer shaft sleeve is arranged in the framework layer, a spiral left flow channel is formed in the surface of the outer shaft sleeve in the clockwise direction, and a spiral right flow channel is formed in the surface of the outer shaft sleeve in the clockwise direction. The two ends of the spiral left flow channel are connected through a first connecting pipe, a first industrial pump is arranged on the first connecting pipe, an inner shaft sleeve is arranged in the outer shaft sleeve, a spiral right flow channel is formed in the outer wall of the inner shaft sleeve anticlockwise, and the two ends of the spiral right flow channel communicate through a second connecting pipe. And the second connecting pipe is connected with a second industrial pump. The roller is scientific and reasonable in structural design, the left flow channel and the right flow channel form two-way convection, the flow speed of cooling liquid is increased, the surface temperature difference of the roller body is small, and the problem of uneven cooling is solved; the included angle between the axis of the double-flow channel and the axis of the roller body is 15 degrees, and the turbulence effect is enhanced.