783 results about "Volute" patented technology

The utility model provides an air pipe type air conditioner, and relates to the technical field of household appliances. The air pipe type air conditioner comprises a shell provided with an air return opening; the volute assembly is located in the shell and comprises a first volute and a second volute, the first volute is provided with a first connecting part, the second volute is provided with a second connecting part, the first connecting part and the second connecting part are matched and fixed to form a matching part, and the matching part is perpendicular to the plane where the air return opening is located so that the matching part can be disassembled through the air return opening. According to the air pipe type air conditioner, the matching part formed by matching the first connecting part of the first volute and the second connecting part of the second volute is perpendicular to the plane where the air return opening is located, and the second connecting part can be pushed and pulled in the direction perpendicular to the plane where the air return opening is located; therefore, the second volute is installed in the shell or separated out of the shell through the air return opening, the structure is simple, operation is convenient, and the disassembly and assembly efficiency is improved.

The invention relates to the field of mechanical engineering, in particular to a hydraulic-structure collaborative optimization design method for a shield pump, and aims to solve the problems of load distortion and structure matching imbalance caused by traditional staged optimization. The method comprises the following steps: constructing a fluid-solid bidirectional coupling simulation model, and extracting transient hydraulic loads under multiple working conditions; establishing a structure dynamic response agent model based on modal superposition and Gaussian process regression; key coupling parameters such as the impeller outlet width and the volute base circle diameter are recognized through a Sobol method; and the efficiency, the lift fluctuation rate, the stress and the vibration are taken as multiple targets, and a Pareto optimal solution is searched through an improved genetic algorithm. Manufacturing constraints are embedded in the optimization process, the single period is shorter than 48 hours, and fatigue life evaluation and knowledge base intelligent recommendation are supported. According to the method, closed-loop cooperation of hydraulic excitation and structural response is achieved, the vibration prediction error is lower than 10%, the optimization dimension is compressed to be within 5 dimensions, the efficiency is improved by 20 times or above, and the performance reliability and the design intelligence level of the shield pump are remarkably improved.

The invention provides a leading pretreatment device for pumping and cleaning clustered marine organisms and floaters, the leading pretreatment device comprises a buoyancy platform, a butt joint structure, a controller and a dispersion assembly, a treatment cabin is arranged in the middle of the buoyancy platform, and the dispersion assembly is composed of a turbulent flow triggering assembly and a liquid spraying assembly; impurities are collected in a suction mode, the device is provided with self-buoyancy and a modular structure and can be rapidly in butt joint with a tail bag of an interception net, the optimal suction posture is achieved, and the core innovation of the device is that a dispersing assembly and a cutting device are sequentially arranged in the suction direction, material distribution is achieved through a rotating cylinder and a conical column, and high-frequency vibration and a reverse micro-impact mechanism are combined; the block mass structure is effectively damaged; by adopting the unique design of the fixed impeller and the rotary volute, an annular liquid curtain is formed when the barrel rotates, so that the winding property and the overall strength of disaster-causing objects can be reduced, the disaster-causing objects are more easily scattered and cut by subsequent components, the subsequent mechanical load is reduced, the problem of blockage of a flow channel is solved, and the energy consumption and the abrasion of equipment are reduced.

A fan assembly and a gas water heater. The fan assembly comprises: a fan housing (10), the fan housing (10) being provided with a volute air channel (101), and the volute air channel (101) having a volute inlet (1011) and a volute outlet (1012); and a freeze protection device (50), the freeze protection device (50) comprising an air pipe (51) and a blade (52), the air pipe (51) being connected to the fan housing (10) and being communicated with the volute outlet (1012), at least a part of the air pipe (51) being integrally formed with the fan housing (10), and the blade (52) being connected to the air pipe (51) and being configured to be unidirectionally opened in the air outlet direction of the volute air channel (101).

The utility model discloses a fan and an air duct type air conditioner. The fan comprises a volute. The volute comprises a volute body and a movable inner shell. The volute body is provided with a side air outlet located in the side face and a lower air outlet located in the bottom face. The movable inner shell is arranged on the inner side of the volute body and provided with a ventilation opening. The movable inner shell is rotatably arranged around the axis of the fan relative to the volute body so that the fan can be switched between the side air outlet state and the lower air outlet state. In the side air outlet state, the ventilation opening communicates with the side air outlet to form a side air outlet channel used for supplying cold air. In the lower air outlet state, the ventilation opening communicates with the lower air outlet to form a lower air outlet channel used for supplying hot air. On the plane perpendicular to the axis of the draught fan, the projection of the side air outlet channel forms a side air outlet volute molded line. And the projection of the lower air outlet duct forms a lower air outlet volute molded line. The shape of the side air outlet volute molded line is different from that of the lower air outlet volute molded line. According to the utility model, the working noise of the fan is effectively reduced.

The utility model particularly relates to three-axis linkage synthesis mixing equipment, a mixing reaction method and a method for preparing ferric oxalate. The three-axis linkage synthesis mixing equipment comprises a motor and a gear box, a volute is arranged at the top of the outer barrel, and an air outlet is formed in one side of the volute and used for exhausting air; the three rotating shafts are arranged in the outer cylinder body, each rotating shaft is provided with an inner cylinder body, a plurality of vertically arranged gas-liquid separation plates are uniformly arranged on the upper part of each inner cylinder body along the peripheral side, and a plurality of layers of blades which are parallel to one another and are obliquely arranged are arranged on the lower part of each inner cylinder body along the peripheral side; the bottom of the volute is provided with an opening matched with the inner cylinder with the gas-liquid separation plate in size; the inner cylinders on the three rotating shafts are mutually enclosed to form an inner duct, and the rotating shafts are synchronously driven by a motor to rotate through a gearbox; a plurality of annular separation discs are arranged on the inner wall of the outer cylinder body; and an air inlet is further formed in the peripheral side of the outer cylinder body. The utility model has the advantages that the contact area and the contact time of the solvent and the air are fully increased and prolonged in a weightless state.

The invention relates to a centrifugal fan and a range hood. The centrifugal fan comprises a volute and an impeller. A current collector is arranged at the air inlet of the volute; the first disc and the second disc are oppositely arranged in the front-back direction; the blades are connected between the first disc and the second disc and distributed in the circumferential direction, the front edge of at least one blade is provided with a wave-shaped section, and the length H2 of the wave-shaped section in the axis direction of the impeller meets the conditions that 0.8 Dn < = D1 < = Dn, 0.5 < = Hz / Hq < = 2; wherein D1 is the maximum diameter of an inlet of the current collector, Dn is the minimum inner diameter of the impeller, Hz is the axial depth of the impeller, and Hq is the air inlet space depth of the front side or the rear side of the centrifugal fan in the machine shell. A plurality of parameters such as the axial length size of the wave-shaped section, the inlet size of the current collector, the inner diameter of the impeller, the depth direction size of the impeller on the single side and the depth of the air inlet space on the side are subjected to collaborative design synthesis and matching. The invention has the advantages that the pneumatic performance of the machine can be ensured while the airflow noise is obviously reduced.

The invention discloses an efficient low-noise centrifugal fan. The efficient low-noise centrifugal fan comprises an impeller, a volute and a current collector. Core innovative design is adopted for the impeller, the combined strategy of inlet angle changing, thickness changing and blade number optimizing is adopted, the inlet angle of each blade ranges from 20 degrees to 25 degrees, the outlet angle of each blade ranges from 36 degrees to 49 degrees, the thickness of each blade decreases linearly from the inlet end to the outlet end, the number of the blades ranges from 14 to 16, accurate design is conducted on the basis of a deduced thickness and performance correlation formula, and the blade number is optimized. And the airflow impact loss is effectively minimized. Meanwhile, the volute adopts an exponential expansion section (the expansion coefficient k is equal to 1.05-1.08) and is combined with a volute tongue (R is equal to 15-18mm) with a specific circular arc radius, so that the airflow uniformity is remarkably improved, and the backflow noise is reduced. In addition, the inner wall of the volute is covered with a nano-porous sound absorption coating to absorb residual vortex noise. Through the cooperation of the structures, the excellent comprehensive performance that the total pressure efficiency is larger than or equal to 82% and the operation noise is smaller than or equal to 75 dB (A) is finally achieved, and the air conditioner is particularly suitable for the ventilation environment with the high requirements for energy efficiency and silence.

The utility model discloses an air conditioner which comprises a machine shell assembly, an air duct assembly and a heat exchanger assembly. The machine shell assembly comprises a machine shell. The machine shell comprises a detachable first shell plate. The air duct assembly is arranged in the machine shell and comprises an air duct volute and a fan, the fan is installed on a second volute, the air duct volute comprises a first volute and a second volute which are oppositely arranged in the first direction, the first volute and the second volute are detachably connected, the first volute is installed and fixed to the machine shell assembly, and the second volute is installed and fixed to the machine shell assembly. The second volute is slidably connected with the machine shell assembly and is detachable relative to the machine shell assembly, and the second volute can slide relative to the machine shell assembly and the first volute in the second direction so that the second volute and the draught fan can be taken out of the machine shell or installed into the machine shell. According to the air conditioner provided by the embodiment of the utility model, the second volute and the fan can be conveniently taken out from the shell assembly, the fan can be conveniently maintained and cleaned, and the disassembly difficulty of the air duct assembly is reduced; and the mounting difficulty of the air duct assembly is reduced.

The utility model provides a centrifugal volute feeding cyclone which comprises a body, a plurality of barrels are arranged at the top of the body, and flange plates are fixedly installed on the outer side faces of the barrels. The multiple supporting frames are arranged on the outer side faces of the multiple barrels correspondingly; and the multiple limiting assemblies are arranged on the outer side faces of the multiple supporting frames correspondingly. According to the centrifugal volute feeding cyclone provided by the utility model, the supporting frame, the threaded ring, the rotating ring, the pull rod, the clamping assembly and other structures are matched with one another, so that when the cylinder body is mounted, the cylinder body only needs to be inserted into the inner side surface of the supporting frame, then the bottom of the flange plate is propped against the top of the supporting frame, and the cylinder body is mounted; and then a threaded ring is rotated to drive a rotating ring, a pull rod and a clamping assembly to move downwards, so that the bottom of the clamping assembly is pressed on the top of a flange plate, the effect of limiting and mounting the barrel can be achieved, operation is convenient and rapid, and the mounting efficiency is improved.

The application relates to the technical field of centrifugal pumps, and particularly discloses a high-sealing non-variable-volume pump and components thereof, which comprises a pump shell and an impeller, a water inlet and a water outlet are respectively arranged on the pump shell, the pump shell is in a volute type, the volute type comprises a wide section and a narrow section, and the pump shell further comprises a flow assisting mechanism which comprises a flow distribution port and a flow distribution sleeve arranged on the narrow section of the pump shell, a plurality of liquid inlet holes are arranged in a circular array on the water inlet, and the flow distribution sleeve is covered on the flow distribution port and the liquid inlet hole at two ends respectively. In the application, the flow distribution sleeve guides the fluid into the flow distribution sleeve along the flow distribution port at the narrow section of the volute type with the largest pressure during the operation of the impeller, then the flow distribution sleeve supplements the fluid to the water inlet of the pump shell, and the negative pressure at the water inlet is supplemented to reduce the cavitation and prolong the service life of the centrifugal pump.

The utility model discloses a low-resistance inlet structure of a cyclone of a cement preheater, and relates to the field of cement industrial production. The feeding device comprises an inlet air pipe, a volute body is installed on one side of the inlet air pipe, an inner cylinder integrated with the volute body is welded to the middle of the volute body, a column body is installed on the lower side of the volute body, a discharging cone is installed below the column body, a plurality of installation frames are installed on the peripheral side of the column body, and the installation frames are installed on the lower side of the volute body. A discharging pipe is installed at an outlet of the discharging cone, and a low-resistance inlet assembly is arranged at an inlet of the inlet air pipe. According to the utility model, the air conveying pipe and the expansion shell are arranged at the inlet air pipe, and the expansion shell is arranged at the top of the inlet air pipe and the top of the air conveying pipe, so that the width of the inlet air pipe is kept unchanged, the height of the air inlet is increased, and the area of the inlet of the cyclone cylinder is properly increased, and in this way, the resistance can be effectively reduced, and the influence on the separation efficiency of the cyclone separator is small.

The application relates to the technical field of high-speed centrifugal blowers, and discloses a single-stage air-floating blower which comprises an outer shell body, an inner shell body, a first end cover, a second end cover, a third end cover, a fourth end cover, a stator, a rotor shaft, a thrust disc, a volute body, a gas compression impeller, a main fan, an auxiliary fan, a radial air-floating bearing and an axial air-floating bearing. The main fan is arranged to cool the stator, the rotor and the radial air-floating bearing, the auxiliary fan is arranged to cool the axial air-floating bearing, and after the auxiliary fan cools the axial air-floating bearing, the cooling gas in the channel can flow into the cooling channel of the main fan. Compared with the previous air-floating blower scheme, the cooling efficiency between the stator and the rotor is improved, and the air amount entering the axial air-floating bearing is increased by arranging the auxiliary fan.

This invention provides a volute, a fan assembly, an indoor air conditioning unit, and an air conditioner. The volute includes a body (1), the air outlet surface of which has alternating protrusions (2) and recesses (3) along the axial direction of the volute. Adjacent protrusions (2) are spaced apart by a first distance S. The body (1) has a throat (4) and an air outlet end (5). Both the protrusions (2) and the recesses (3) extend from the throat (4) to the air outlet end (5). The starting end (6) and the ending end (7) of the protrusions (2) and the recesses (3) are located between the throat (4) and the air outlet end (5), with the starting end (6) being closer to the throat (4) than the ending end (7). According to the volute of this invention, the axial disturbance of airflow during the operation of the cross-flow fan can be improved, the stability of the internal airflow can be enhanced, and the operating efficiency of the cross-flow fan can be increased.

The invention provides a disassembly-free maintenance high-temperature slurry oil pump and a maintenance method thereof, and aims to solve the problems that an impeller of an existing high-temperature slurry oil pump usually adopts an impeller wear ring for wear-resistant protection, on one hand, the impeller wear ring is possibly loosened due to thermal expansion difference or material occlusion tendency, and on the other hand, when the impeller wear ring is abraded and needs to be replaced, the impeller wear ring is damaged. And parts such as a bearing box body, a pump cover, an inner pump cover and the like need to be completely disassembled. According to the high-temperature slurry oil pump capable of being maintained without disassembly, the wear-resistant surface is integrally arranged on the surface of the impeller to replace an impeller wear ring, and the problem that when the impeller wear ring is replaced, the whole pump part needs to be disassembled is solved; besides, a plurality of adjusting blocks are arranged between the bearing box and the bearing box body in the circumferential direction and matched with the wear-resistant surface of the impeller, so that when the sealing gap between the impeller and the wear-resistant volute becomes large, the sealing gap between the impeller and the wear-resistant volute can return to the standard sealing gap value only by disassembling the adjusting blocks and adjusting the thickness of the adjusting blocks, and the maintenance time is greatly shortened.

The utility model discloses a coal mine underground drilling dust prevention device, and relates to the technical field of underground drilling dust prevention. The underground coal mine drilling dustproof device comprises a dustproof cover, a rotating rod is movably arranged on the dustproof cover, one end of the rotating rod is connected with a drill bit, two connecting rods are rotatably arranged on the inner wall of the dustproof cover, one end of each connecting rod is connected with a cylindrical gear, a rotating shaft is fixed to one end of each cylindrical gear, and two dust discharging pipes are oppositely embedded in the dustproof cover. The ends, close to the drill bit, of the two dust discharging pipes communicate with volutes, impellers are arranged in the volutes, the rotating shaft is rotationally connected with the volutes, the impellers are arranged on the rotating shaft, and a movable gear is arranged on the rotating rod and meshed with the cylindrical gear, so that when the rotating rod drives the drill bit to conduct drilling, through cooperation of the cylindrical gear, the rotating shaft and the impellers, the dust discharging pipes can be driven to drill. And dust generated by drilling is absorbed and is discharged outwards through the volute and the dust discharging pipe, and the dustproof effect in the drilling process is effectively improved.

The utility model provides a duct type air conditioner and an air conditioner. The duct type air conditioner comprises a shell. A partition structure is arranged between every two adjacent fan assemblies of the at least two fan assemblies; the fan assembly comprises a fixed volute; a movable volute; and a baffle. According to the duct type air conditioner and the air conditioner, the movable volute is used for adjusting the first air outlet and the second air outlet in the fixed volute, and therefore air can be discharged from the first air outlet of the fixed volute and can also be discharged from the second air outlet of the fixed volute; meanwhile, the baffle is used for separating the air inlet of the draught fan from the first air opening or the second air opening, the working reliability of the duct type air conditioner is guaranteed, the problem that the air outlet direction of the duct type air conditioner can be adjusted only by changing the rotating direction of the draught fan in the prior art is solved, and the duct type air conditioner can obtain reliable air volume in the refrigerating mode or the heating mode; and the heat exchange efficiency of the duct type air conditioner is ensured.

The utility model relates to the technical field of breathing machine fans, in particular to a fan volute structure for a breathing machine. The volute structure comprises an outer shell, a driving mechanism and a control part, the outer shell comprises an upper shell body and a lower shell body which are in butt joint, an air inlet is formed in the upper shell body, the upper shell body and the lower shell body are in butt joint, an air outlet is formed in one end of the outer shell body, an air cavity for communicating the air inlet and the air outlet is formed in the outer shell body, and the upper shell body is arranged in a concentric circle; the lower shell is not arranged in a concentric circle; the driving mechanism comprises a motor shell, a driving assembly, a fan blade piece and a first lower end cover, one end of the motor shell penetrates through the lower shell, the driving assembly is located in the motor shell, the rotating shaft is exposed out of the motor shell and connected with the fan blade piece, the fan blade piece is located in the air cavity, and the first lower end cover abuts against the motor shell and is connected with the lower shell; the control piece is contained in the first lower end cover, electrically connected with the driving assembly and externally connected with a power source. Efficient airflow conduction can be achieved, and the noise of the fan can be reduced.

The present application belongs to the technical field of gas water heater, and specifically discloses a volute, a fan and a gas water heater, wherein the volute has a profile line, and the profile line comprises first, second, third, fourth and fifth profile lines connected in sequence; the fourth profile line constitutes a spiral main body of the volute, the first and fifth profile lines constitute an outlet of the volute, the second profile line constitutes a volute tongue of the volute, and the third profile line is smoothly connected with the second and fourth profile lines; based on a base point of the fourth profile line, the distance between the connecting point of the fourth and third profile lines and the base point is R1, and the distance between the connecting point of the fourth and fifth profile lines and the base point is R2; the radius of any point on the fourth profile line is r, and r=4*(R2-R1)*θ 2 / R9π 2 +R1; the fan comprises an impeller and the above-mentioned volute, so as to improve the efficiency of the fan; and the gas water heater adopts the above-mentioned fan, thereby improving the efficiency of the gas water heater by improving the efficiency of the fan.

The utility model provides a centrifugal fan, including volute still include: impeller, the impeller is provided with at least two groups, and at least two groups impeller follow the axial direction of volute, the middle disc is arranged between two groups of adjacent impeller, two groups of adjacent impeller are separated through the middle disc, and the import of middle disc is linked together with the import of volute, each group impeller is provided with several blades, and several blades are arrayed around the axial direction of volute, and the blade of two groups of adjacent impeller is staggered along the projection direction of blade. Through the mode for increasing the number of blade, increase the times of cutting the airflow that enters the volute, thereby improved the frequency of rotation noise, namely BPF noise, make BPF noise frequency far away from the hearing range of human ear, and then reduce the situation that the user hears the rotation noise. In addition, the blade that interlaces can break the shedding vortex that the blade tail edge produces, reduces the broadband noise of fan.

The present application relates to the technical field of cooking devices, and provides a range hood assembly and an integrated stove. The range hood assembly comprises: a volute comprising a cavity; a motor provided in the volute and connected to the volute; and a damping component provided in the volute. In the axial direction of the motor, the damping component is located between the volute and the motor, and in a second direction, the damping component is located between the volute and the motor, the second direction being perpendicular to the axial direction of the motor. By means of providing the damping component, the technical effects of reducing the working noise of the range hood assembly, improving the working stability and reliability of the motor, and enhancing the sealing performance of the range hood assembly are achieved.

The application provides a centrifugal fan and a range hood, the centrifugal fan comprising an impeller, a volute and a guide ring assembly, the volute having a first side shell and a second side shell arranged oppositely, the guide ring assembly having a first end and a second end, the first end being arranged on the first side shell, the second end being arranged on the second side shell, and the guide ring assembly being formed with a flow guide channel and a receiving cavity between the first end and the second end, the receiving cavity extending from the first end to the second end, a plurality of through holes being arranged on the receiving cavity, the impeller being arranged in the receiving cavity, and the flow guide channel extending from the first end and being at least partially located in the receiving cavity. According to the centrifugal fan, airflow is guided into the receiving cavity through the flow guide channel, and then orderly discharged from the through holes under the action of the impeller, so that the vortex or turbulent flow is avoided, the noise is reduced, and the performance of the centrifugal fan is improved.

The invention provides a cabinet air conditioner, and belongs to the field of air conditioners. An upper air opening is formed in the top of the shell, and a lower air opening is formed in the bottom of the shell; the air duct component is arranged in the machine shell, a machine shell channel is defined between the air duct component and the machine shell, the air duct component is provided with a plurality of volute assemblies communicated with fluid in the height direction of the machine shell, each volute assembly is provided with a centrifugal air duct, an air inlet is formed in the axial direction of the centrifugal air duct, and an air outlet is formed in the radial direction of the centrifugal air duct. The volute assembly can be controlled to rotate along a preset rotating axis of the centrifugal air duct so as to change the air outlet direction of the volute assembly; the air conditioner has a single lower air supply mode in which air enters from an upper air port and exits from a lower air port, and also has a single upper air supply mode in which air enters from the lower air port and exits from the upper air port; when the air conditioner executes the single lower air supply mode, the multiple volute assemblies can be controlled to rotate to the downward air outlet position, and when the air conditioner executes the single upper air supply mode, the multiple volute assemblies can be controlled to rotate to the upward air outlet position.

A split volute for a centrifugal pump is disclosed that provides a manufacturing advantage by improving the yield of high-chrome iron casting, providing for full surface coating capability using line-of-sight spray coating systems. Performance improvements include improved pump efficiency, abrasion resistance, and volute lifetime. Additional operational cost savings are enabled through reduced time required for common volute maintenance procedures and an increased replacement interval for the volute. Taken together, these advantages reduce the total cost of ownership of the split volute pump system.

The present application provides an air duct assembly, an indoor air-conditioning unit, and a control method. The air duct assembly comprises: a volute structure and a fan blade, wherein the fan blade is mounted in an air cavity, and the volute structure is provided with a clearance groove; and a regulation member, movably arranged at the clearance groove, the regulation member having a closed position at which at least part of the regulation member overlaps the clearance groove to block an airflow gap between the regulation member and the clearance groove, and an open position at which at least part of the regulation member extends out of the clearance groove, wherein when the regulation member is located at the closed position, the side of the regulation member close to the fan blade is adapted to the shape of the volute structure, and when the regulation member is located at the open position, at least part of the fan blade and the clearance groove are both spaced apart from the regulation member, so that airflow flows through two sides of the regulation member to change an air inlet direction and an air outlet direction of the air cavity. The technical solution provided by the present application can solve the technical problem in the prior art of large energy waste caused by upper and lower air outlet modes.

The invention relates to the technical field of centrifugal compressors, and discloses a centrifugal compressor system which comprises a compressor assembly and a centrifugal compressor, the compressor assembly comprises an impeller, an impeller housing, a diffuser and a volute, the impeller is arranged on the impeller housing, the diffuser is arranged at an outlet of the impeller, and the volute is connected with the impeller housing and arranged on the outlet side of the diffuser; and the ultrasonic generator is fixed on at least one of the impeller housing and the diffuser. Therefore, the centrifugal compressor system utilizes the ultrasonic waves to slightly vibrate and mix the working medium gas in the system, so that the low-energy fluid in the boundary layer can continuously obtain energy injection of the fluid in the main flow area, the kinetic energy of the boundary layer and the turbulent kinetic energy of the main flow area are improved, separation is delayed, surge is delayed, the surge allowance is increased, and the separation efficiency is improved. In addition, the maximum bearing load of the blades can be increased, the efficiency of the centrifugal machine is improved, and the gas compressor assembly can keep stable operation under wider working conditions.

The pipeline type air conditioner comprises a machine shell and an indoor unit, the indoor unit comprises an indoor heat exchanger, a volute, a fan assembly and a supporting component, the volute is arranged on one side of the indoor heat exchanger, a first air outlet is formed in the volute, and at least part of the fan assembly is arranged in the volute. The supporting component is provided with an air inlet and a second air outlet communicated with the air inlet, the volute is slidably and detachably connected to the supporting component, and the air inlet is communicated with the first air outlet. According to the scheme, the volute and the supporting component are slidably and detachably connected, so that the fan assembly in the volute can be conveniently maintained or replaced.

The invention relates to a classifier based on airflow separation, comprising: a casing comprising a fixed cylinder, and a conical shell cavity and an ash bucket connected to the upper and lower sides of the fixed cylinder; an external air source is obliquely blown into the conical shell cavity in the tangential direction of an air outlet of the tangential air supplement volute; corresponding conical caps are fixedly mounted at the top of the fine powder discharging pipe at intervals; the ventilating and flow guiding conical shell is matched with the fine powder discharging pipe through a mounting hole of the ventilating and flow guiding conical shell so as to be mounted on the inner side of the tangent air supplementing volute; the ventilation flow guide conical shell is hollow and is provided with a corresponding inflation cavity, and the grading reinforcing mechanism comprises a plurality of micron air holes which are uniformly distributed in the conical surface of the ventilation flow guide conical shell. According to the device, the contact rate and the contact uniformity of materials and airflow can be effectively improved, and the entrainment amount of materials with small particle sizes when the materials with large particle sizes pass through an airflow washing area can be effectively reduced.

A vertical centrifugal pump having improved hydraulic stability in a hump region, comprising a volute casing (4) and a centrifugal impeller (2), wherein the centrifugal impeller (2) is located in the volute casing (4); hydrofoil-profile radial guide vanes (3) are provided between an outlet of the centrifugal impeller (2) and an inlet of the volute casing (4), the number of the vanes being coprime to the number of blades of the centrifugal impeller (2); the chord lengths, the cross-sectional areas and the maximum thicknesses of the plurality of radial guide vanes (3) each gradually increase along the increase of the cross-sectional area of the volute casing (4); the radial guide vane (3) having the minimum chord length, the minimum cross-sectional area, and the minimum maximum thickness is located at a position corresponding to the minimum cross-sectional area of the volute casing (4); the plurality of radial guide vanes (3) have the same inlet diameter and the same inlet installation angle. In this way, the hump characteristics of the pump at low flow rates can be suppressed, and the magnitudes and fluctuations of the axial and radial forces on the impeller and the guide vanes in the hump region can be reduced, thereby comprehensively improving the hydraulic stability of the vertical centrifugal pump having the guide vanes in the hump region in many aspects.

This utility model discloses a deburring device for volute casing machining, belonging to the field of volute casing machining technology. It includes a movable base and a grinding base. A movable frame is arranged above the movable base, and a clamping platform is arranged above the movable frame. Three sliding grooves are formed on the upper surface of the movable base, and the movable frame is located on the upper surface of the movable base to form a left-right moving structure. The clamping platform forms a rotating structure, and a sliding groove is formed on the upper surface of the clamping platform. A first clamping block and a second clamping block are slidably connected inside the sliding groove. The first clamping block forms a clamping structure on the outer left and right sides of the volute casing, and the second clamping block forms a clamping structure on the inner left and right sides of the volute casing. This deburring device for volute casing machining has the advantages of stable clamping of the volute casing and multi-angle grinding, and is suitable for the deburring stage in the volute casing machining process, helping to improve the grinding quality and efficiency of volute casing.