Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
  • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
  • F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
  • F01C21/007—General arrangements of parts; Frames and supporting elements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
  • F04C28/04—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for reversible pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
  • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2220/00—Application
  • F04C2220/10—Vacuum
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2250/00—Geometry
  • F04C2250/10—Geometry of the inlet or outlet
  • F04C2250/101—Geometry of the inlet or outlet of the inlet

Definitions

• the present invention relates to a single-stage roots vacuum pump used for a vacuum sewer system or the like for transporting sewage discharged from homes, factories, etc., and a vacuum-type fluid transport using the single-stage roots vacuum pump. It is about the system.
• a water ring vacuum pump is generally used as a vacuum generator for a vacuum station (relay pump station) that generates a vacuum pressure to be applied to a vacuum conduit, and an ejector type is generally used. It is known that.
• FIG. 1 the vacuum station 1 using an ejector-type vacuum generator is shown in FIG.
• the waste water in the waste water tank 2 is spouted out from the radiator 4 by the waste water circulation pump 3 and circulated in the waste water tank 2 buried under the road etc. It is configured to maintain the negative pressure of the vacuum sewer line by the negative pressure generated at the time of spout.
• a vacuum station using a general water ring vacuum pump is known as a system which generates a vacuum efficiently and collects a relatively wide area.
• a vacuum station using a conventional water-sealed vacuum pump requires a pumping pump in addition to the water-sealed vacuum pump, making it difficult to make the vacuum station compact.
• a multistage roots vacuum pump capable of rotating in the forward and reverse directions is used as a vacuum pump for a vacuum wastewater collection and drainage apparatus. If a pressure difference of 70 kPa or more occurs between the suction port side and the discharge port side of this multistage roots vacuum pump, the temperature of the casing on the discharge port side is about 150 ° due to compression heat. It is known that it is good for C.
• the vacuum station 1 using the above-described conventional projector-type vacuum generator configured as described above has a vacuum generation efficiency higher than that of a water-sealed vacuum pump.
• a degree of vacuum there was a problem that running cost increased.
• the object of the present invention is to suppress an increase in the installation space, and it is also preferable that the corrosion resistance is good, and that the pressure flow rate is reduced in the case of pumping by reverse rotation. It is an object of the present invention to provide a single-stage roots vacuum pump capable of reducing the discharge time and a vacuum-type fluid transfer system using the single-stage roots vacuum pump.
• a single-stage roots vacuum pump includes a casing having an inlet and an outlet formed therein, and a casing provided in the casing.
• a pair of three-leaf rotors having three pieces of leaves are provided, and between the suction port and the discharge port, the fluid is sucked from the suction port I by rotating the pair of three-leaf rotors in a continuous manner.
• Ejection loca is a single-stage roots vacuum pump capable of rotating forward and reverse.
• the suction port is provided at a position where the center force of each rotation axis also exceeds the volume movement angle of 120 degrees with respect to the suction port side with respect to an imaginary line connecting the centers of the rotation axes of each rotor. It is provided at a position beyond the displacement angle of 120 degrees with respect to the discharge port side from the center of each rotation axis with respect to an imaginary line connecting the centers of the rotation axes of the rotor.
• a tip end portion of a drive-side rotor shaft that constitutes a rotation shaft of the rotor is provided to protrude outside the casing, and a cooling fan is provided at a tip end portion of the provided drive-side rotor shaft. It is configured to cool the casing or the housing provided on the side of the casing by the wind of the cooling fan generated as it rotates.
• At least one of the rotor, the casing, or the housing provided on the side of the casing is made of a corrosion resistant material of a two-resist-type pig iron having a small coefficient of thermal expansion.
• a horizontally-long slit-like outside air introduced parallel to the width direction of the casing is provided in the vicinity of an imaginary line on the peripheral wall of the discharge port side
• the time for introducing the outside air can be extended, a large amount of outside air can be introduced, and operation with a single-stage Roots-type vacuum pump becomes possible.
• the total volume movement angle of the enclosed space surrounded by the adjacent leaf pieces of each rotor and the casing inner wall surface is 240 degrees, which is twice the volume movement angle of 120 degrees, and Since the distance of movement of the seal between the top and the inner wall of the casing is increased, the internal leak rate is reduced, the volumetric efficiency is improved, and the air on the discharge port side flows into the sealed space quickly. The amount of outside air inflow is large, and the temperature rise of the vacuum pump main body is suppressed.
• the casing or the housing provided on the side of the casing is cooled by the wind of the fan generated as the rotation occurs.
• the vacuum pump is cooled, which can prevent problems due to temperature rise.
• the corrosion resistance of the casing, the rotor, and the housing can be improved by forming the casing, the rotor, and the housing with a corrosion-resistant material having a low coefficient of thermal expansion-resist-based pig iron.
• the range in which the waste water can be collected is expanded, and a vacuum-type fluid capable of collecting waste water etc. up to a relatively wide area.
• a delivery system is provided.
• FIG. 1 is a cross-sectional view taken along the line A-A in FIG. 3 for explaining the configuration of a single-stage roots vacuum pump.
• FIG. 2 is a cross-sectional view taken along the line B-B in FIG. 1, illustrating the configuration in which the three-leaf rotor portion is omitted.
• FIG. 3 It is a side view explaining the whole structure of a single stage root type vacuum pump.
• FIG. 4 It is a front view explaining the whole structure of a single stage roots type vacuum pump.
• FIG. 5 A conceptual view for explaining the configuration of a vacuum type fluid transfer system using the single-stage roots type vacuum pump of Example 1 of the embodiment.
• FIG. 6 is a horizontal cross-sectional view of the casing of the single-stage roots vacuum pump as seen from the inside of the casing toward the inner wall surface 6c where the outside air introduction hole is formed.
• ⁇ 8 A vertical sectional view below the ground illustrating the configuration of a vacuum station using a conventional vacuum pump of the actuator type.
• FIGS. 1 to 7 a single-stage roots vacuum pump and a vacuum fluid using the single-stage roots vacuum pump according to a preferred embodiment of the present invention will be described.
• the transportation system will be explained to Y. Itoda.
• the single-stage roots vacuum pump 5 as the single-stage roots vacuum pump is shown in FIG. 3 or FIG. Show Thus, the drive motor M as a drive source is mounted on the top of the set base 10 provided.
• the single-stage roots vacuum pump 5 is mainly provided with pulley side housings 7 and gear side housings 8 attached to both sides of the casing 6.
• the two parallel drive side roots rotor shaft 11 and the follower side roots rotor shaft 12 are rotatably supported by bearings 9 ⁇ inserted in the shaft.
• timing gears 13 and 13 which are mutually meshed with each other are attached to the shaft ends of the driving side roots rotor shaft 11 and the driven side roots rotor shaft 12 projecting from the gear side housing 8.
• a motor pulley 16 provided on the rotational drive shaft 15 of the drive motor M and an annular V-belt member are provided at the end 11a of the drive-side roots rotor shaft 11 projecting from the pulley-side housing 7.
• a main body pulley 14 interlocked via 17 is provided, and a cooling fan 18 is rotatably provided integrally with the front end edge.
• the casing 6 or the pulley side housing 7 provided on both sides of the casing 6 or the gear side housing 8 is generated by the wind of the cooling fan 18 generated as the drive side roots rotor shaft 11 rotates. Is configured to be cooled.
• a pair of three-leaf rotors 20 and 21 are rotatably provided with a slight gap in the opposite direction to each other.
• Three-leaf rotors 20, 21 each have three-leaf pieces.
• the three-leaf rotors 20 and 21 are rotationally driven to generate fluid from the suction port 6a. For example, air is sucked, and the sucked air is compressed by the three-leaf rotors 20 and 21 and discharged from the discharge port 6b. Between the inner wall surface 6c of the casing 6 and the tops of the leaves of the three-leaf rotors 20, 21, as is known, a minimum clearance of a certain size is provided.
• the suction port 6a and the oblong mouth 6d are provided at a position n more than 120 degrees from the virtual line, and the suction mouth 6a and the mouth 6d have an angle of about 10 degrees with each other. Are arranged.
• each drive side roots rotor shaft 11 and the driven side are provided at a position beyond a volume movement angle of 120 degrees from the center of the roots rotor shaft 12, simply speaking, a position 0 over 120 degrees from a virtual line.
• the outlet 6d and the mouth 6e are arranged at an angle of about 10 degrees to each other.
• the horizontal opening 6e is provided at an angle of about 120 degrees with the suction opening 6a.
• An intermediate position p located between the center of each driving side roots rotor shaft 11 and the center of the driven sides roots rotor shaft 12 and an inner diameter circle located on the extended circumference of the inner wall surface 6 c of the casing 6 are Of the inner wall surface 6c in the area up to the intersection points q and q, a pair of outside air introduction holes 22 and 22 are in the shape of a horizontally elongated slit parallel to the casing width direction in the vicinity of the imaginary line m. Formed in position!
• the horizontal opening h is opened by being inclined about 5 ° from the horizontal line h. It is preferable because the explosion noise at the time of the introduction of the outside air is reduced rather than the case.
• a sealed space S surrounded by adjacent leaf pieces of the three-leaf rotors 20 and 21 and the inner wall surface 6 c of the casing 6 is formed inside the casing 6.
• the casing lid 23 on the discharge port 6b side of the casing 6 is connected to the outside air communication holes 24, 22 communicated with the outside air introduction holes 22, 22 via the internal spaces 25, 25. 24 are formed.
• each of the three-leaf rotors 20 and 21, the casing 6, or the pulley side housing 7 or the gear side housing 8 provided on both sides of the casing 6 At least one of them is made of a corrosion resistant material having a small coefficient of thermal expansion equivalent to that of FCZFCD material—a resist-based steel.
• thermal expansion coefficient of 10 ⁇ 12 X 10- 6 Z ° C - resist D3 is most preferred.
• safety cover members 29 and 30 are provided so as to cover the pulley side housing 7 and the gear side housing 8, and an exhaust gas siren device 3 is provided on the periphery of the discharge port 6b.
• the timing at which the air flows into the sealed space S on the discharge port 6b side is early, the amount of outside air inflow is large, and the temperature rise of the single-stage roots vacuum pump 5 main body is suppressed.
• the cooling effect of the fan 18 is also added, and the conventional single-stage roots vacuum pump can operate in a powerful vacuum region that can not be operated.
• the external air communication holes 24, 24 and the internal space 25 in the enclosed space S surrounded by adjacent leaf pieces of the two three-leaf rotors 20, 21 and the casing inner wall surface 6c. 25, the situation (a) to (e) where the air flows in through the outside air introduction holes 22, 22 and is shown.
• the hatched portion represents an enclosed space S that moves with the rotation of both trilobe rotors 20 and 21.
• the outside air introduced from the outside air introduction holes 22, 22 is represented.
• the single-stage roots vacuum pump 5, the driving motor M, and the force set base 10 are placed above and below and connected by a V-belt member 17. ing.
• the set base 10 is provided with a silencer 28 for introducing outside air, and the piping 26 for outside air inlet and the check valve 27 are inserted via the silencer 28 for introducing outside air.
• Fresh outside air is introduced into the casing 6 by connecting the outside air introducing pipe 26 extending from the outside air communication hole 24 formed in the casing lid 23.
• the single-stage roots vacuum pump 5 and the drive motor M can also be installed as a direct connection.
• FIG. 5 shows a vacuum type fluid transfer system using the single-stage roots type vacuum pump 5 according to the first embodiment of the present invention.
• waste water W discharged by household I flows into manhole equipment H installed at each door or every few doors by natural flow.
• the piping 32 is laid.
• a large float valve 34 is installed at the lower part of the weir 33, and a spherical valve which opens on the valve seat 36 of the valve body 35 by the buoyancy due to the rising water level of the sewage W. Float 37 is placed.
• a vacuum drain 40 is connected to the outlet 38 of the manhole H via a discharge valve 39.
• the suction port 6 a of the single-stage Roots-type vacuum pump 5 is connected to a vacuum-type sewage drainage device 42 through a pipe 41.
• the vacuum type sewage collection and drainage apparatus 42 is provided with a first check valve 43 and a second check valve 44 which can open and close the flow path by control at the inlet and outlet of the tank 42a.
• a first check valve 43 and a second check valve 44 which can open and close the flow path by control at the inlet and outlet of the tank 42a.
• it is configured to be opened and closed as appropriate.
• vacuum sewer pipe 40 has a length of several Km
• installing one or more small-sized vacuum sewage collection and drainage devices 42 along the way can achieve more stable functions. .
• Vacuum type flow using single-stage roots type vacuum pump 5 for the vacuum station of this embodiment 1 In the body transport system, domestic sewage W from which household I equal power is discharged flows into the manhole apparatus H installed at each door or every few doors by natural flow down through the inside of the piping 32.
• the manhole apparatus H drainage is intermittently performed according to the change in the height direction level of the water level L 1 of the waste water W.
• the float valve 34 in the manhole apparatus H has a concave portion formed on the surface of the spherical float 37 or the valve seat 36 for passing a small amount of air in the manhole apparatus, the water level L1 is a valve Even if the seat 36 is lowered and the float valve 34 is closed, the odor containing air is sucked into the vacuum drainage pipe 40 so that no odor backflow phenomenon occurs.
• the single-stage roots type vacuum pump 5 for the vacuum station generates a degree of vacuum of ⁇ 70 kPa by normal rotation driving, and the upper side in the tank 42a.
• the first check valve 43 opens and flows into the sewage W force inlet force tank 42 a in the vacuum drain 40.
• the upper limit switch detects the rise of the water level L2, and the single-stage roots vacuum pump 5 is automatically turned off. Replace.
• the single stage roots vacuum pump 5 functions as a compression pump.
• the single-stage roots type vacuum pump 5 has a slit-like outside air introducing hole 22 in the form of a horizontally long slit parallel to the casing width direction near an imaginary line m of the inner wall 6 c which is the discharge port side peripheral wall of the casing 6.
• compressed air is discharged to the tank 42a by reverse driving of the single-stage roots vacuum pump 5, and the pressure in the tank 42a becomes a pressure of 1 kg / cm 2 or more.
• the first check valve 43 is closed, the waste water W is pushed downward, and the second check valve 44 is opened.
• waste water W is conveyed from the outlet through the pressure pipe 46 to the purification treatment plant 45.
• the installation space can be reduced compared to the conventional multistage Roots type vacuum pump.
• the vicinity of the virtual line m of the peripheral wall of the discharge port 6 b of the casing 6 in addition, by providing the slit-like outside air introduction hole 22 in the horizontal direction parallel to the casing width direction, the time for introducing the outside air becomes long, and a large amount of outside air can be introduced.
• the total volume movement angle of the enclosed space surrounded by the adjacent leaf pieces of each three-leaf rotor 20, 21 and the casing inner wall surface 6c is 240 degrees, which is twice the volume movement angle of 120 degrees. Since the moving distance of the seal portion between the tops of the leaves of the three-leaf rotors 20 and 21 and the casing inner wall surface 6c becomes large, the internal leakage amount is reduced and the volumetric efficiency is improved.
• the installation space can be reduced compared to a multistage vacuum pump.
• the cooling fan 18 is mounted on the tip end portion 11 a of the drive side roots rotor shaft 11. As a result, the heat generated by the housing 6 or the pulley housing 7 provided on both sides of the casing 6 and the gear housing 8 is taken away by the wind of the cooling fan 18 generated as it rotates. It is cooled and the vacuum pump is cooled.
• the corrosion resistance can be improved by forming No. 8 and the like with a corrosion resistant material of double resist based pig iron having a small coefficient of thermal expansion.
• the single-stage roots vacuum pump 5 in the vacuum type fluid transfer system the range where the waste water can be collected is expanded, and the vacuum type can collect the waste water etc. up to a relatively wide area.
• a fluid delivery system is provided.
• the waste water is collected from the weir 33 of each household I to the vacuum type sewage collecting and discharging apparatus 42 provided with the single-stage roots type vacuum pump 5, but in particular Without being limited thereto, for example, the tank 42a is installed below each manhole H, and each single-stage root type vacuum so that the pressure inside the tank 42a can be increased or decreased by each single-stage root type vacuum pump 5.
• the single-stage roots vacuum pump 5 is used in a conventionally known vacuum-type fluid transfer system, for example, by disposing the pump 5 in a distributed manner, any configuration may be used! /.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Applications Or Details Of Rotary Compressors (AREA)
• Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38218015

Family Applications (1)

Country Status (4)

Families Citing this family (15)

Citations (6)

Family Cites Families (10)

• 2005
  • 2005-12-27 JP JP2005374056A patent/JP4746982B2/ja not_active Expired - Fee Related
• 2006
  • 2006-12-26 EP EP06843211.1A patent/EP1967735A4/en not_active Withdrawn
  • 2006-12-26 WO PCT/JP2006/325827 patent/WO2007074795A1/ja not_active Ceased
  • 2006-12-26 US US12/087,159 patent/US7950911B2/en not_active Expired - Fee Related

Patent Citations (6)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events