Abstract: A louver blade for a louver assembly includes a first section, a second section extending from the first section and including a crest of the louver blade, an extension extending from the second section to form a recess between the extension and the second section, and a protrusion extending from the second section toward the extension and configured to facilitate retention of the particles within the recess. The extension is configured guide particles into the recess in an installed configuration of the louver blade with the louver assembly.

Abstract: A system for cleaning air flowing into an engine provided with a plurality of sub-blocks. A plurality of air separators arranged in the plurality of sub-blocks, wherein each sub-block includes air separators having a predetermined optimal air flow velocity. At least one rotary louver/shatter is associated with at least one sub-block. A controller is provided to control transitioning of at least one rotary louver/shatter based on a sensed air flow velocity into the engine or on a velocity of the vehicle.

Abstract: A venting device with a splash guard for deflection of splashing water entering the interior of the venting device has slats with a front section arranged at the exterior. Venting slots are formed between the front sections. At least one of the slats has a deflection section arranged at the interior and a central section connecting deflection section and front section. The front section and the deflection section are angled relative to the central section. The front section of the at least one slat in the operating position of the venting device extends from the central section toward the top side. The deflection section extends in the operating position from the central section toward the bottom side. The deflection section has a region oriented at an angle of less than 90° relative to the central section. A power tool with such a venting device is provided.

Abstract: Mitigating particulate intrusion to an air intake system of a gas turbine system with intrusion protective coatings tailored to locale of operation. A particulate intrusion protective coating is applied to a surface of a component of the air intake system to mitigate ingress of particulates within the air intake system and the gas turbine system. The particulate intrusion protective coating includes one or more particulate ingress influencing properties tailored to the common attributes of the particulates associated with the locale of operation of the gas turbine engine and the air intake system. The particulate ingress influencing properties affect rebounding and coalescing characteristics of the particulates at a point of impact with the applied surface having the particulate intrusion protective coating, entraining the particulates at the point of impact and inhibiting further ingress along an inlet air flow path of the air intake system into the gas turbine engine.

Abstract: A heat exchanger is provided. The heat exchanger provides a first plurality of tubes and a second plurality of flow passages which furcate near one of the first and second manifolds into two or more furcated flow passages and subsequently converge to exit the heat exchanger. The plurality of furcated flow passages are intertwined, reducing the distance between flow passages containing each fluid therebetween to improve thermal transfer. Further, the furcations create changes of direction of the fluid to re-establish new thermal boundary layers within the flow passages to further reduce resistance to thermal transfer.

Abstract: The present disclosure relates to louvers for enabling an air passage between an outside and an inside. More particularly, the present disclosure relates to louvers enabling said air passage while minimizing rain ingress towards an interior and minimizing noise produced in the interior. The present disclosure further relates to wind turbines including said louvers.

Abstract: A single inlet/single outlet modular counterflow cooling tower having two heat transfer sections installed atop two cold water basin sections and below three fan sections, each heat transfer section having its own water distribution system and draining into its own distinct cold water basin section. The water distribution system can provide flow over both heat transfer sections or over only a single section. The center fan support section supports the mechanical drive system for the fan and has a sealing plate at its bottom for sealing the gap between the two heat transfer sections.

Abstract: A particle separator system for a turbine engine having an engine inlet. The particle separator system includes an inlet particle separator located within the engine inlet and configured to remove particles from an incoming airflow. The particle separator system also includes a barrier filter located within an enclosure of the turbine engine downstream of the inlet particle separator, the barrier filter being configured to intercept particles not scavenged by the inlet particle separator.

Abstract: A wet scrubber at least comprises a treatment tank, a jet pipe, a gas-liquid separation component, and a spray component. The treatment tank is used to contain a cleaning solution. The jet pipe is disposed in the treatment tank, by injecting the cleaning solution to suck in an exhaust gas, and mixing the cleaning solution with the exhaust gas, and directly injecting into the cleaning solution contained in the treatment tank, thereby forming a plurality of microbubbles in the cleaning solution to dissolve the exhaust gas and capture solid particles in the exhaust gas. The gas-liquid separation component is used to filter and block water mist raised in the cleaning solution. The spray component is used to prevent the solid particles from clogging the gas-liquid separation component.

Abstract: A condensation management apparatus comprises a microstructured film arranged to condense water vapor on an underside of a substantially horizontal surface. The film comprises channels disposed at least on a first major surface and configured to support capillary movement of condensate. The channels have a channel axis substantially parallel with a longitudinal axis of the film. A capillary siphon structure of the film comprises a fold in the film, a condensate collection region proximate the fold, and a siphon region between the fold and a condensate release location of the film. At least a portion of a second major surface is attached to the underside of the substantially horizontal surface such that longitudinal openings of the channels of the condensate collection region are oriented towards a direction of gravity and the condensate release location is positioned lower along the direction of gravity than the condensate collection region.

Abstract: A particle separator includes a housing through which a flow stream is directed. A number of guide vanes are disposed in the housing. The guide vanes have a profile wherein the flow stream is guided to follow the profile. The guide vanes have a wall surrounding an open interior that defines a vane plenum. A plurality of through-holes extend through the wall of the guide vane. The through-holes are open to the flow stream and to the vane plenum. A duct connects with the vane plenum and is configured to discharge particles collected in the vane plenum.

Abstract: A fill sheet for cooling heat transfer fluid in a cooling tower includes an air intake end, an air outlet end, a top edge and a bottom edge. The air outlet end is positioned opposite the air intake end along a lateral axis. The top edge connects the air intake end and the air outlet end and the bottom edge also connects the air intake end and the air outlet end. The bottom edge is positioned opposite the top edge along a vertical axis. A plurality of flutes extends generally parallel to the lateral axis between the air intake end and the air outlet end. An offset extends generally parallel to the vertical axis. A first flute of the plurality of flutes transitions from a first peak at a first side of the offset to a first valley at a second side of the offset.

Abstract: A fill sheet for cooling heat transfer fluid in a cooling tower includes an air intake end, an air outlet end, a top edge and a bottom edge. The air outlet end is positioned opposite the air intake end along a lateral axis. The top edge connects the air intake end and the air outlet end and the bottom edge also connects the air intake end and the air outlet end. The bottom edge is positioned opposite the top edge along a vertical axis. A plurality of flutes extends generally parallel to the lateral axis between the air intake end and the air outlet end. An offset extends generally parallel to the vertical axis. A first flute of the plurality of flutes transitions from a first peak at a first side of the offset to a first valley at a second side of the offset.

Abstract: An evaporator and a baffle structure thereof are disclosed by the present application. The baffle structure is configured to block liquid droplets in a gas, and includes: a bottom portion extending in a first direction and side portions extending from the bottom portion in a direction intersecting the first direction; and a liquid blocking region provided on the side portions, the liquid blocking region being provided therein with a plurality of holes penetrating the side portions to allow gas to pass through the holes.

Abstract: A wet desulfurization apparatus includes a chamber enclosing a space for passing flue gas and including a first barrier partitioning the space into first and second chamber regions, a flue gas inlet to introduce raw flue gas into the first chamber region, and a flue gas outlet to discharge desulfurized flue gas from the second chamber region; a second barrier partitioning a slurry reservoir into a first reservoir part to store a first pH alkaline slurry and a second reservoir part to store a second pH alkaline slurry; a first sprayer to spray the alkaline slurry from the first reservoir part into the first chamber region to remove sulfur from the flue gas in the first chamber region; and a second sprayer to spray the alkaline slurry from the second reservoir part into the second chamber region to remove sulfur from the flue gas in the second chamber region.

Abstract: The invention relates to a gas liquid separator, for separating liquid droplets from a gas flowing generally in a main gas flow direction through the gas liquid separator. The gas liquid separator comprises a plurality of plates, mutually parallel and spaced apart to form a flow channel there between. Each plate having a plurality of corrugations wherein at least one of the corrugations has an extrados wing profile shaped camber.

Abstract: Moisture separator configuration for separating water droplets from steam of a flow having a mixture of steam and water droplets, such that the cited flow travels through the moisture separator configuration so that this separation is achieved. The moisture separator configuration includes a plurality of plates oriented in line with the flow. The plurality of plates form channels through which the flow travels. The channels have progressive cross section variation along the flow direction, in order to collect progressively the water droplets separated from the steam in the flow.

Abstract: Compositions for the treatment of flue gas desulfurization scrubber effluent may generally comprise, based on weight percent of the composition, at least 50% fly ash, up to 20% calcium oxide and/or calcium hydroxide, up to 2% plasticizer and a balance of incidental impurities. Methods for the treatment of flue gas desulfurization scrubber effluent using the composition for the treatment of flue gas desulfurization scrubber effluent are also described.

Abstract: A drift eliminator to remove liquid from a flow of air in a cooling tower includes an eliminator inlet, a plurality of flutes, an eliminator ridge, and a plurality of ribs. The eliminator inlet is to receive the flow of air. The plurality of flutes are configured to convey the flow of air through the drift eliminator. The eliminator ridge has a first drift wall extending in a first direction and a second drift wall extending in a second direction. Each flute is in fluid communication with the eliminator ridge and is defined by a flute interior surface curving upwards from the flute inlet to a flute outlet. The plurality of ribs are defined by adjacent ones of the flutes and curving upwards toward the flute outlet.

Abstract: An inertial separator for removing particles from a fluid stream includes a body defining a through passage, with at least one separator inlet and at least one separator outlet, a turn provided in the body between the at least one separator inlet and the at least one separator outlet, and a flow splitter having at least one particle outlet fluidly coupled to the outside of the through passage.

Abstract: An adaptive inertial particle separation system may include an active configuration and a passive configuration. The system may comprise an air-intake duct including an outer wall spaced apart from a central axis, an inner wall located between the outer wall and the engine rotation axis, an intake passage defined in part by the inner wall and the outer wall, and a splitter located between the outer wall and the inner wall. The system may further include a sensor operatively connected to the air-intake duct and operative to initiate at least one of the active configuration and passive configuration.

Abstract: An air intake separator system includes a plurality of vanes adapted to remove fluid or precipitation from an air stream, wherein the vanes are operably coupled to tubular rods with an interference fit. Applying an elevated temperature heat transfer fluid to the plurality of vanes removes fluid or precipitation from an air stream in order to prevent ice formation. Likewise, applying a lower temperature heat transfer fluid can cool the vanes.

Abstract: The present invention is an air purification method and device. Due to the lower airflow resistance that the present invention induces, an exhaust fan or blower with motor of lower torque is adopted. Consequently, the whole air purification is operated at a lower noise level. Lower operational voltage is applicable for the high-voltage electrostatic precipitator device and provides a similar or superior performance and effectiveness for dust removal. The air purification device/system is designed with higher flexibility and of more compact in dimension and size. Dust is removed from the environment by a high voltage electrostatic precipitator. The airflow stream within a high-voltage electrostatic precipitator is such that the direction of the path of the airflow is changed at least twice.

Abstract: A moisture separator for a steam turbine power plant for separating moisture from a flow of vapor or gas that includes a bundle of vanes having a corrugated portion and a trailing edge. The trailing edge includes means to collect moisture on the surfaces of the trailing edge. These means can include a clip-like attachment, or a U-shape of the trailing edge itself. The collection means on the trailing edge contribute to the overall moisture separation efficiency of the moisture separator and a decrease of risk of damage to the steam turbine driven by the steam flow.

Abstract: Disclosed herein is an air cleaner, having at least one air inlet formed therein, includes a chassis having at least one air inlet passage inner peripheral surface formed therein, an air-sending device, a filter, and a front panel having at least one air inlet passage outer peripheral surface formed therein. An air inlet passage, providing communication between the air inlet and the filter, is formed between the air inlet passage inner peripheral surface and the air inlet passage outer peripheral surface. The air inlet passage inner peripheral surface and the air inlet passage outer peripheral surface have respective curvatures in a left-right direction, and the curvature of the air inlet passage inner peripheral surface is greater than that of the air inlet passage outer peripheral surface.

Abstract: A filter system may include a filter housing and a filter. The filter may include layers of impermeable material. Additionally, the filter may include at least one first layer of corrugated filter media situated between layers of the impermeable material. The at least one first layer may at least partially define a first plurality of flutes extending from a first side of the filter to a second side of the filter. The filter may also include at least one second layer of corrugated filter media situated between layers of the impermeable material. The at least one second layer may at least partially define a second plurality of flutes extending from a third side of the filter to a fourth side of the filter. The housing may be configured to direct a first fluid into the first side of the filter, and direct a second fluid into the third side of the filter.

Abstract: Liquid collector trays (5) are disclosed for use in vertical towers (7) in which vapor (9) moves upward and liquid (11) moves downward. The liquid collector trays (5) employ elongated plates (13) which in certain embodiments include a primary liquid collector trough (15) and a secondary liquid collector trough (17). In other embodiments, the primary liquid collector troughs (15) of adjacent plates (13) are aligned so as to form elongated, inwardly-tapering entrance channels (29) which are free of sharp corners. In further embodiments, when the liquid collector tray (5) is in its operative orientation and is viewed from above, each plate (13) includes first and second concave surfaces (31, 33), which collect liquid, and third and fourth convex surfaces (35, 37), which are adjacent to the first and second concave surfaces (31, 33) and serve to mechanically stabilize the plate (13).

Abstract: Provided is an apparatus for separating liquid from a gas/liquid mixture, including: a housing; a gas/liquid mixture inlet located at a lower side of the housing; a coalescer placed in the housing above the gas/liquid mixture inlet for extending the volume of liquid droplets from the mixture passing the coalescer; at least one liquid feed, which liquid feed runs at least partially through the coalescer and ends at location below the gas/liquid mixture inlet; a liquid outlet for the separated liquid fraction located at a lower side of the housing under the coalescer; and a gas outlet for the separated gas fraction located at an upper side of the housing above the coalescer.

Abstract: A moisture and dust removing louver pack is composed of a set of pivotable louvers which can pivot between open and closed positions in an air passageway, the louvers allowing air to pass through the passageway when in the open position and having moisture and dust removing structure for air to impinge upon to remove moisture and dust from the air passing through the passageway.

Abstract: Vane type mist eliminator segments are arranged in a plurality of tiers at separate vertically spaced locations in a tower, typically of the upright, cylindrical type, with the eliminator at each tier covering only a portion of the cross section of the tower. The eliminator segment(s) in each tier are laterally displaced in the tower from the adjacent vertically spaced eliminator segments to form a staggered configuration for the segments. Each mist eliminator preferably extends over 50-70% of the cross-sectional area of the tower to leave an open flow passage in the tier; the staggering of the segments and the associated flow passages defines an upward tortuous or zig-zag open flow path for vapors ascending the tower through the open flow passages when the eliminator segment(s) become fouled in use.

Abstract: A droplet separator pack having at least two elongate lamella droplet separator profiles is described. Retaining strips that have a planar front and rear face and side faces adapted to the curved shape of the lamella droplet separator profiles are arranged between the lamella droplet separator profiles at at least one end thereof. The retaining strips include latching connection means for clipping together wherein the corresponding lamella droplet separator profiles are clipped together between adjacent retaining strips. In this manner droplet separator packs can be assembled in a simple manner at the place of installation.

Abstract: Embodiments of the present invention provide an inlet particle separator for a gas turbine engine having an inlet flow path, a scavenge flow path, a core flow path, and a flow splitter disposed between the scavenge and core flow paths. A plurality of grooves may be disposed about an inner surface of a wall of the separator within the inlet flow path.

Abstract: This invention relates to an in-situ cleaning fixture for mist removal separator vane assemblies. The cleaning fixture includes an injection chamber with an inlet and a perforated plate which extends horizontally, substantially over the length of the mist removal separator vane assembly. A cleaning fluid source is connected to the injection chamber during a cleaning process. The injection chamber is designed to receive the cleaning fluid, pass the cleaning fluid through the holes formed in the plate, downwardly along a plurality of vanes in the mist removal separator vane assembly and into the drain trough. The in-situ cleaning fixture facilitates removal of scale build-up from the mist removal separator vane assembly and thereby restores the efficacy of the vanes.

Abstract: A filter unit and method for removing grease, oil and other particulates from air, for example, in a kitchen environment. The filter unit includes a housing having an upstream side, an downstream side, and a cavity therebetween, a heat exchanger disposed within the cavity and comprising at least two parallel tubes, at least one entrance aperture disposed on the upstream side of the housing and defined by at least one fin, at least one baffle disposed on the downstream side of the housing so as to be oppositely disposed from the at least one entrance aperture, and at least one exit aperture disposed on the downstream side of the housing adjacent the at least one baffle. The baffle and fin define at least one S-shaped flow path through the housing, and the flow path routes air around a downstream side of a first of the at least two tubes and then around an upstream side of a second of the at least two tubes.

Abstract: A system and methods for separating liquids, aerosols, and solids from a flowing gas stream whereby gas flows through a helical path formed in a separator element. Partially separated gas exits the bottom of the separator element at a generally conical cavity. Clean gas exits through an inner tube that is axially aligned beneath the helical path. Separated materials exit through an annular space between the inner tube and an outer tube. Separation occurs in the helical channels which include radially diverging walls to provide an aerodynamically efficient flow, in a region of high swirl created in a generally conical cavity beneath the separator element, and in a toroidal vortex ring created in the annular space. The area and geometry of the helical path, the conical cavity, and the inner and outer tubes is optimized to provide efficient separation at varying gas flow rates and at varying liquid loads.

Abstract: A vacuum cleaner has a body including a nozzle assembly and a handle assembly. A suction generator and a dirt collection vessel are both carried on the body. The dirt collection vessel includes a dirt cup having a side wall and a bottom wall, a tangentially directed inlet in the side wall and an axially directed outlet. An inside surface of the side wall includes ribbing to help remove dirt and debris from the airstream and improve vacuum cleaner performance and efficiency.

Abstract: A fat or grease filter for a ventilator or exhaust hood is provided, and includes a cartridge assembly that is removably attached to a tube assembly. The cartridge assembly includes at least one helix assembly that is received in an associated tube of the tube assembly. The at least one helix assembly located inside the associated tube defines a first helical air path between an inlet located at an upper front side of the tube assembly and a bottom equalizer manifold connected to the associated tube, and a second helical air path between the equalizer manifold and an outlet located at an upper back side of the tube assembly. The equalizer manifold directs the air flow from the first to the second helical air path. Centrifugal force created within the first and second helical air paths causes fatty particles to separate from the airstream and stick inside the tube.

Abstract: A moisture separator where a corrugated plate 43 is provided with a collecting plate 49 formed to cover a flat portion 74 and an upstream end of a slope portion disposed on a downstream side of the flat portion 74. The collecting plate 74 has an opening which opens to an upstream side in the direction of the wet steam flow S1. The collecting plate 49 is fixed to the slope portion at a base end. Between the collecting plate 49 and a body portion of the corrugated plate, a pocket section 47 and a drain duct section 48 are formed. The moisture contained in the wet steam S1 turns into droplets and enters the pocket section 47 and the drain duct section 48 from the opening of the collecting plate 49 and falls down the pocket section 47 and the drain duct section 48 respectively by gravity.

Abstract: The inlet device has a horn-shaped passage piece at a peripheral wall of a column that feeds a fluid tangentially into the column so that the fluid enters into a vortex flow that rotates around an axis adjacent to a central axis of the column. A middle zone and discharge zone of the passage piece are made in the manner of a diffuser and abut the peripheral wall to extends over less than one half of the wall. A discharge zone of the passage piece through which flow takes place presets a middle flow direction of the fluid which extends along the peripheral wall and is inclined against the main direction.

Abstract: An enhanced vane bundle design that provides additional inlet chord area. An enhanced vane bundle for use in separator vessels includes top and bottom convexly-curved outlet baffles that extend horizontally from the outlet-side of the vane pack, the outlet baffles including a plurality of corresponding holes. The enhanced vane bundle further includes curved plates affixed to the convexly-curved outlet baffles, the curved plates and the convexly-curved outlet baffles define vertical pockets that extend vertically through an entirety of an outlet chord area on an outlet side of the enhanced vane bundle. The enhanced vane bundle further includes a plurality of tubes connecting the corresponding holes of the outlet baffles and extending vertically through the entirety of the outlet chord area.

Abstract: A wet gas separator providing superior separation of entrained droplets of liquids in a gas stream when compared with prior art wet gas separators. The wet gas separator of the present invention has a combination of: a gas inlet system with vanes that divide and direct the gas stream very evenly across the cross-sectional area of the inlet portion of the apparatus, a first stage Z-shaped de-entraining device at the upstream side of a wire mesh mist eliminator, and a gas outlet system having cyclones for removal of traces of re-entrained droplets. The apparatus of the present invention has capability of improving processing throughput by 50% when compared with prior art apparatus, with greater de-entrainment efficiency (achieving 99.7% removal of droplets larger than 10 microns in size).

Abstract: A vane inlet apparatus is provided for separating components of a feed stream. The apparatus includes a body having an axis, a proximal end, and a distal end. The body includes an inlet and a plurality of vanes disposed along the axis. Each vane includes an aperture such that the apertures in successive vanes decrease in size toward the distal end of the apparatus. The vanes may be flat or curved. The sizes, shaped, and orientation of the vanes along the apparatus may be determined according to the designed specifications of a particular project. The apparatus as well as the vanes and apertures are preferably cylindrically shaped to match the incoming feed stream cross-section. A method of constructing the vane inlet apparatus is also provided.

Abstract: The invention hereby disclosed is a vertical filtering and separating suction machine of chips, steam and smoke for machining center, lathe machine or other machines, which operates by sudden changes of sucked air, thus generating hits which separate heavy particles, whose suction pipe extends almost up to the bottom of the rotor, which only uses filters at the end of the process of air purification, whose rotor has outer paddles modified in order to improve suction power and to cause more hits of air flow, and which includes an air pressure alarm showing the filter is saturated.

Abstract: An enhanced vane bundle design that provides additional inlet chord area. An enhanced vane bundle for use in separator vessels includes top and bottom convexly-curved outlet baffles that extend horizontally from the outlet-side of the vane pack, the outlet baffles including a plurality of corresponding holes. The enhanced vane bundle further includes curved plates affixed to the convexly-curved outlet baffles, the curved plates and the convexly-curved outlet baffles define vertical pockets that extend vertically through an entirety of an outlet chord area on an outlet side of the enhanced vane bundle. The enhanced vane bundle further includes a plurality of tubes connecting the corresponding holes of the outlet baffles and extending vertically through the entirety of the outlet chord area.

Abstract: An extension piece portion is provided at a lower end portion of a screen plate so as to extend from the lower end portion, beyond a gas-passing through hole, to an oil pocket portion. An oil guide portion is provided at respective gas-hitting-side face portions of the screen plate and the extension piece portion so as to guide oil trapped at the above-described face portions into the oil pocket portion. Accordingly, it can be prevented that part of the oil in the middle of dropping down into the oil pocket portion from the screen plate is carried away by the gas flow passing through the gas-passing through hole, so that the efficiency of oil trap can be improved.

Abstract: A vane-type separator with pockets for removing solid and liquid particles entrained in a gaseous stream. Vanes are fabricated from a plurality of modular components which may be assembled to form vanes of varying lengths. The vanes include pockets with rounded leading edges to encourage particulate to impinge on the vane and move into the pockets by surface tension and aerodynamic forces. The vane-type separator allows for a higher gas stream velocity before particulate is found downstream of the vane-type separator.

Abstract: A conduit piece for the absorption of foreign bodies in an air distribution conduit of an air-conditioning installation, with a bent portion, the inner wall (I) of which has a large bend radius (Rg) and a small bend radius (Rk). To avoid flow noises according to the invention, an interception device (1, 10, 11, 13, 14) be provided in the region of the large bend radius (Rg) for the purpose of intercepting foreign bodies carried through the conduit piece together with the air.

Abstract: A separator is provided. The separator in which the flow is conducted using separation elements from an inflow to an outflow in such a manner that at reversal points media separators deposit a separation medium. Depending on the flow through them and the orientation with respect to the acceleration due to gravity, individually shaped separating elements are arranged in such a manner that at least two different paths of the flow along the separating elements in the separator form.

Abstract: The invention relates to a mist eliminator system for gas scrubbers and the like. Said mist eliminator system comprises front and rear mist elimination layers in relation to the direction of the flow of gas, which layers are composed of respective rows of parallel mist elimination profiles, one layer of which being configured in the shape of a V or of an upturned V and the lateral sections of this layer extending away from the corresponding lateral sections of the other layer or extending in parallel thereto. Both mist elimination layers can be or are received on a single common carrier structure by a common lateral wall or a common supporting structure on which the lateral walls of the mist elimination layers are stationarily or detachably arranged.

Abstract: A method of designing a gas-solid separator that has an inner cylinder having a closed lower end and an opened upper end, and extending in a vertical direction; an outer cylinder that coaxially covers the inner cylinder from the outside and has a gas vent port formed on the upper end side of the inner cylinder and communicating with an exterior; and a plurality of axially extending long holes formed a side surface on the lower end side of the inner cylinder in a circumferential direction, one of long side edge parts of each of the long holes being provided with a guide blade that protrudes outward and is inclined circumferentially so as to cover the long hole.