WO2017057533A1 - 内接歯車ポンプ - Google Patents

内接歯車ポンプ Download PDF

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Publication number
WO2017057533A1
WO2017057533A1 PCT/JP2016/078755 JP2016078755W WO2017057533A1 WO 2017057533 A1 WO2017057533 A1 WO 2017057533A1 JP 2016078755 W JP2016078755 W JP 2016078755W WO 2017057533 A1 WO2017057533 A1 WO 2017057533A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
trochoid
gear pump
internal gear
recess
Prior art date
Application number
PCT/JP2016/078755
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
一 淺田
圭 服部
伊藤　貴之
洋 赤井
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2015193242A external-priority patent/JP2017066975A/ja
Priority claimed from JP2015193292A external-priority patent/JP2017066976A/ja
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Priority to DE112016004484.4T priority Critical patent/DE112016004484T5/de
Priority to US15/764,666 priority patent/US20180274539A1/en
Priority to CN201680057233.2A priority patent/CN108138766B/zh
Publication of WO2017057533A1 publication Critical patent/WO2017057533A1/ja

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Classifications

    • 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
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F04C2230/22—Manufacture essentially without removing material by sintering
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • F04C2240/56—Bearing bushings or details thereof
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/805—Fastening means, e.g. bolts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/20—Resin

Definitions

  • the present invention relates to an internal gear pump (trochoid pump) that pumps liquids such as oil, water, and chemicals.
  • An internal gear pump (trochoid pump) is configured such that an outer rotor and an inner rotor having a trochoidal tooth shape are sealed in a casing, and an inner rotor and an outer rotor fixed to the drive shaft rotate along with the rotation of the drive shaft. It is a pump which acts to inhale and discharge.
  • a pump having a resin casing has been known as a pump of this type that can reduce the machining process and can be manufactured at low cost (see Patent Document 1).
  • FIG. 4 is a sectional view of a conventional internal gear pump.
  • the pump 21 is mainly composed of a trochoid 24 in which an inner rotor 23 having a plurality of external teeth is accommodated in an annular outer rotor 22 having a plurality of internal teeth.
  • the trochoid 24 is rotatably accommodated in a circular trochoid accommodating recess 25a formed in a cylindrical casing 25 with a flange.
  • a cover 26 that closes the trochoid-containing recess 25 a is fixed to the casing 25.
  • the trochoid 24 is configured such that the inner rotor 23 is rotatably accommodated in the outer rotor 22 with the outer teeth of the inner rotor 23 meshing with the inner teeth of the outer rotor 22 and is eccentric. Between the partition points where the rotors contact each other, the suction-side and discharge-side volume chambers are formed according to the rotational direction of the trochoid 24.
  • a drive shaft 29 that is rotated by a drive source (not shown) is fixed through the shaft center of the inner rotor 23. When the drive shaft 29 rotates and the inner rotor 23 rotates, the outer teeth mesh with the inner teeth of the outer rotor 22 so that the outer rotor 22 rotates in the same direction.
  • Liquid is sucked into the chamber from the inlet.
  • the suction-side volume chamber is changed to a discharge-side volume chamber in which the volume is reduced and the internal pressure is increased by the rotation of the trochoid 24, from which the sucked liquid is discharged to the discharge port.
  • the cover 26 is made of sintered metal, and the casing 25 is an injection-molded body manufactured by injection molding using a resin composition.
  • a metal bush 27 is integrated into the bolt fixing hole portion of the casing 25 by composite molding at the time of injection molding, and the casing 25 and the cover 26 are connected to the main body of the device by the bolt 28 passed through the bush 27.
  • the fixing plate 30 is fastened and fixed. The reason why the bush 27 is interposed in the fastening of the casing 25 and the cover 26 is to maintain the fastening strength at the fastening portion.
  • a seal ring (O-ring) 31 is assembled in a groove 32 formed on the outer periphery of the concave portion of the casing 25 on the joining surface (mating surface) of the casing 25 and the cover 26. Thereby, the trochoid accommodation recessed part 25a is sealed and the leakage of the liquid from the mating surface of the casing 25 and the cover 26 can be prevented.
  • the sealing performance in order to effectively exhibit the pump function, it is important to stably secure the sealing performance (sealing performance of the trochoid-receiving recess 25a) at the mating surface of the casing 25 and the cover 26.
  • As the material of the seal ring 31 hydrogen nitrile rubber (H-NBR system) is used because it has heat resistance and oil resistance of about ⁇ 30 to 120 ° C. and can be applied to a scroll compressor of an air conditioner. .
  • FIG. 8 is a sectional view of another conventional internal gear pump.
  • the pump 61 mainly includes a trochoid 64 in which an inner rotor 63 having a plurality of external teeth is accommodated in an annular outer rotor 62 having a plurality of internal teeth.
  • the trochoid 64 is rotatably accommodated in a circular trochoid accommodating recess 65a formed in a cylindrical casing 65 with a flange.
  • a cover 66 that closes the trochoid-containing recess 65a is fixed to the casing 65.
  • the trochoid 64 is configured such that the inner rotor 63 is rotatably accommodated in the outer rotor 62 with the outer teeth of the inner rotor 63 meshing with the inner teeth of the outer rotor 62 and is eccentric. Between the partition points where the rotors are in contact with each other, the suction-side and discharge-side volume chambers are formed according to the rotational direction of the trochoid 64.
  • a drive shaft 69 that is rotated by a drive source (not shown) is fixed through the shaft center of the inner rotor 63.
  • the cover 66 is made of sintered metal, and the casing 65 is an injection-molded body manufactured by injection molding using a resin composition.
  • the casing 65 and the cover 66 are fastened and fixed to the fixing plate 70 of the apparatus main body by bolts 68.
  • a seal ring 71 is assembled in a groove formed on the outer periphery of the concave portion of the casing 65 on the joint surface (matching surface) between the casing 65 and the cover 66.
  • the trochoid accommodation recessed part 65a is sealed and the leakage of the liquid from the mating surface of the casing 65 and the cover 66 used as the combination of resin and a sintered metal is prevented.
  • the casing 65 is in sliding contact with the outer rotor 62 and the inner rotor 63 at the bottom surface 65c and the inner side surface 65b constituting the trochoid accommodating recess 65a. Since the inner side surface 65b of the trochoid-containing recess 65a is an injection-molded body portion of the resin composition, the frictional wear characteristic with the outer rotor 62 is excellent. Further, the bottom surface 65c of the trochoid accommodating recess 65a is constituted by a disk-shaped metal plate 67 integrated with the casing 65 by composite molding. Thereby, problems such as sink marks when the bottom surface 65c is formed of resin do not occur, the flatness is excellent, and variations in ejection performance are suppressed.
  • a metal bush combined with the casing in order to maintain the fastening strength at the fastening portion of the pump, a metal bush combined with the casing (insert molding) is used. Yes.
  • the cover side end surface which is a joint surface with the cover of the bush, from being covered with the resin during the molding.
  • the bush forming surface around the bush of the casing is recessed from the seal surface (the mating surface with the cover) or the bush end surface, and the bush is slightly protruded from the bush forming surface.
  • the seal surface may be lower than the bush end surface depending on the protruding amount of the bush and the molding conditions of the casing.
  • the bush since the bush is a bolt fastening portion, it comes into contact with the cover, but the sealing surface is not in contact with the cover, and the sealing performance at the sealing portion is not ensured. In this case, the sealing performance is ensured by the seal ring.
  • the present invention (the following first invention) is made to cope with such a problem, and can stably secure the sealing performance between the resin casing and the cover constituting the trochoid housing part,
  • An object of the present invention is to provide an internal gear pump that can omit the seal ring at the portion and can stabilize the discharge capacity.
  • the casing is manufactured by injection molding of resin in order to manufacture the pump at a low cost.
  • the diameter dimension remains the same as the injection-molded finish, and there are slight variations from product to product.
  • variations in depth can cause variations in the discharge amount.
  • the present invention (the second invention described below) has been made in order to cope with such a problem, and can reduce the variation in the depth of the trochoid housing portion among individuals, and has an internal gear having a stable discharge capability.
  • the object is to provide a pump.
  • an inner rotor having a plurality of external teeth is rotatable in an outer rotor having a plurality of internal teeth in a state where the external teeth mesh with the internal teeth and are eccentric.
  • An internal trochoid that is accommodated and has a suction side volume chamber for sucking liquid and a discharge side volume chamber for discharging the liquid sucked into the suction side volume chamber between the inner teeth and the outer teeth.
  • a contact gear pump comprising a casing having a recess for housing the trochoid, and a cover for closing the recess of the casing, wherein the casing is an injection-molded body of a resin composition, and the casing and the cover And has a metal bush in the bolt fixing hole portion of the casing, and in the section of the joint between the casing and the cover, The end face position on the-side is higher than the bush forming surface around the bush of the casing and lower than the seal surface around the recess of the casing or lower than the seal surface when viewed from the bottom surface of the recess. To do.
  • the sealing surface is a surface continuous from the inner surface of the concave portion of the casing, and is in close contact with the surface of the cover to seal the concave portion.
  • the internal gear pump is characterized in that no seal ring is interposed at the joint portion of the casing with the cover.
  • the inner surface of the recess of the casing is made of an injection-molded body of the resin composition, and the bottom surface of the recess is made of a metal body.
  • the resin composition is a resin composition comprising a polyphenylene sulfide resin as a base resin and blended with at least one selected from glass fiber, carbon fiber, and inorganic filler.
  • the internal gear pump of the second invention of the present application is such that an inner rotor having a plurality of external teeth is rotatable in an outer rotor having a plurality of internal teeth in a state where the external teeth mesh with the internal teeth and are eccentric.
  • An internal trochoid that is accommodated and has a suction side volume chamber for sucking liquid and a discharge side volume chamber for discharging the liquid sucked into the suction side volume chamber between the inner teeth and the outer teeth.
  • a contact gear pump comprising: a sintered metal trochoid housing for housing the trochoid; and a casing joined to the outside of the trochoid housing, wherein the casing is an injection-molded body of a resin composition.
  • the trochoid accommodating part and the casing are characterized in that a part of the casing enters and joins the sintered pores on the outer surface of the trochoid accommodating part.
  • the trochoid housing portion is characterized by comprising a main body portion having a cylindrical inner side surface and a flat inner bottom surface, and a lid portion for closing the opening of the main body portion.
  • the lid portion may be fixed by crimping to the opening of the main body portion.
  • the trochoid housing portion and the casing are configured such that a part of the casing is outside the main body portion and the lid portion in the trochoid housing portion. It is characterized by entering and joining the sintered pores on the surface.
  • An internal gear pump includes a casing having a trochoid-containing recess and a cover that closes the recess, the casing is an injection-molded body of a resin composition, and the casing and the cover are bolted.
  • a bushing made of metal in the bolt fixing hole portion of the casing, and in the cross section of the joint portion between the casing and the cover, the position of the end surface of the bushing is the bushing around the bushing of the casing when viewed from the bottom surface of the trochoid receiving recess.
  • the sealing surface preferentially adheres to the cover when bolts are tightened, and always comes into contact with it, so that the sealing performance of the trochoid-receiving recess can be stably secured, and the discharge capacity is also stabilized. Is done.
  • the seal ring that has been conventionally arranged on the outer periphery of the seal surface can be omitted. For this reason, the assembly process of a seal ring is unnecessary in a pump manufacturing process, and assembly becomes easy. Further, it can be used even in an atmosphere higher than 120 ° C. which is the heat resistant temperature of the H—NBR O-ring.
  • the sealing surface is a surface continuous from the inner surface of the trochoid-accommodating recess of the casing and seals the recess in close contact with the surface of the cover, so that liquid enters between the cover and the casing from the trochoid-accommodating recess. Can be prevented.
  • the inner side surface of the trochoid-containing recess of the casing is made of an injection-molded body of the resin composition, and the bottom surface of the recess is made of a metal body, discharge performance is improved at the bottom surface while improving the friction and wear characteristics on the inner side surface. The variation of can be suppressed.
  • the resin composition forming the casing is a resin composition comprising a polyphenylene sulfide resin as a base resin and blended with at least one selected from glass fiber, carbon fiber, and inorganic filler, oil resistance, Excellent chemical resistance and greatly improves dimensional accuracy.
  • An internal gear pump has a sintered metal trochoid housing portion that houses a trochoid, and a casing joined to the outside of the trochoid housing portion, and the casing is an injection molded body of a resin composition.
  • the trochoid housing part and the casing are joined by joining a part of the casing into the sintered pores on the outer surface of the trochoid housing part. That is, the trochoid housing part is a separate component from the casing, and the casing is combined and molded (insert molding) around the trochoid housing part produced in advance, thereby having a structure in which both members are joined.
  • the entire trochoid accommodating part By manufacturing the entire trochoid accommodating part as a separate part, variation in the accommodating part depth among individuals can be reduced. Moreover, the depth itself can be processed with high accuracy. As a result, the internal gear pump has no variation in discharge amount among individuals and has a stable discharge capacity.
  • the trochoid housing part When the trochoid housing part is formed in the casing as in the prior art, the entire casing needs to be processed in order to suppress variations in the depth of the housing part, but only the trochoid housing part should be a separate part. This eliminates that need.
  • the depth-adjusted trochoid housing part may be combined with the casing to reduce the additional work cost. Furthermore, since the trochoid accommodating part is made of sintered metal, it can be easily manufactured, and is firmly joined to the resin casing by the anchor effect to the sintered pores during composite molding.
  • the discharge amount can be designed only by this part. For this reason, a trochoid accommodating part can be made into a common component.
  • the trochoid housing part is only used for composite molding, and the degree of design freedom can be expanded.
  • the trochoid accommodating part is composed of a main body part having a cylindrical inner side surface and a flat inner bottom surface, and a lid part for closing the opening part of the main body part, the adjustment of the accommodating part depth is performed on the axial cross section of the cylinder. It can be executed only by plane machining and is easy to machine.
  • the lid Since the lid is crimped and fixed to the opening of the main body, the conventional bolting process is not required. Further, in the case where the resin body and the metal body are bolted together, the fastening portion may be loosened, but there is no such concern by fixing the main body portion and the lid portion by caulking.
  • the trochoid housing part and the casing are joined so that a part of the casing enters the sintered pores on the outer surface of the main body part and the lid part in the trochoid housing part, that is, covers the lid part side. Since the casing is formed on the main body, it is possible to prevent the lid from coming off from the main body.
  • FIG. 1 is an assembled perspective view of the internal gear pump
  • FIG. 2 (a) is an axial sectional view of the internal gear pump
  • FIG. 2 (b) is the vicinity of the sealing surface of the casing in the internal gear pump.
  • the internal gear pump 1 includes a trochoid 4 in which an inner rotor 3 is accommodated in an annular outer rotor 2, and a circular recess (trochoid accommodating recess) 5a in which the trochoid 4 is rotatably accommodated.
  • the formed casing 5 and the cover 6 that closes the trochoid-containing recess 5 a of the casing 5 are provided.
  • the cover 6 has a shape that substantially matches the outer shape of the upper surface of the casing 5 in which the trochoid-containing recess 5a is opened. As shown in FIG. 2A, the casing 5 and the cover 6 are fastened and fixed to the fixing plate 11 of the device main body by bolts 9.
  • the drive shaft 10 is coaxially fixed to the rotation center of the inner rotor 3.
  • the drive shaft 10 is supported by a bearing (not shown) press-fitted into the cover 6.
  • the outer teeth of the inner rotor 3 are one less than the inner teeth of the outer rotor 2, and the inner rotor 3 is housed in the outer rotor 2 in an eccentric state in which the outer teeth are inscribed in mesh with the inner teeth.
  • the suction-side and discharge-side volume chambers are formed according to the rotational direction of the trochoid 4.
  • the bottom surface 5c of the trochoid accommodating recess 5a of the casing 5 is formed with a suction port that communicates with the suction-side volume chamber and a discharge port that communicates with the discharge-side volume chamber.
  • the suction port communicating with the suction side volume chamber and the discharge port communicating with the discharge side volume chamber may be formed in at least one of the casing 5, the cover 6, and the drive shaft 10.
  • the trochoid 4 is rotated by the drive shaft 10, whereby the liquid is sucked from the suction port into the suction-side volume chamber where the volume increases and becomes negative pressure.
  • the suction-side volume chamber changes to a discharge-side volume chamber in which the volume decreases and the internal pressure increases as the trochoid 4 rotates, and the sucked liquid is discharged from the discharge-side volume chamber to the discharge port.
  • the above pumping action is continuously performed by the rotation of the trochoid 4, and the liquid is continuously pumped. Furthermore, due to the liquid sealing effect in which the sealing performance of each volume chamber is enhanced by the sucked liquid, the differential pressure generated between the volume chambers is increased, and a large pumping action is obtained.
  • the cover 6 is made of metal, and the casing 5 is an injection-molded body of a resin composition.
  • the resin casing 5 is bolted to the apparatus main body, there is a concern that the fastening portion is loosened due to creep deformation of the resin.
  • a countermeasure against creep is possible by using a predetermined resin composition containing a reinforcing agent as described later as a resin material, it may be brittle and inferior in impact resistance.
  • a metal bush 7 is provided in the bolt fixing hole portion of the casing 5.
  • the casing 5 and the cover 6 are fastened and fixed to a fixing plate 11 of the apparatus main body by a bolt 9 passed through the bush 7.
  • the metal bush 7 has a cylindrical shape having a flange 7 b and is provided through the flange portion 5 g of the casing 5.
  • the bush 7 can be fixed to the casing 5 by press-fitting, or can be fixed by being integrated (insert molding) by composite molding by placing the bush in a mold when the casing 5 is injection molded.
  • the resin enters the surface concave portion of the sintered body, and the bush 7 and the casing 5 are firmly joined by the anchor effect.
  • the seal surface 5d is a surface continuous from the inner surface 5b of the trochoid-containing recess 5a and seals the mating surface of the casing 5 and the cover in close contact with the surface of the cover.
  • the housing recess 5a is sealed.
  • the cover-side surface that is adjacent to the inner side surface 5 b is formed as the sealing surface 5 d, so that liquid can be prevented from entering between the cover and the casing from the trochoid-containing recess.
  • the internal gear pump of the first invention of the present application is characterized by the positional relationship after molding between the seal surface of the casing and the end surface of the bush. That is, the height position of the end surface 7a on the cover side of the bush 7 is higher than the bush forming surface 5e around the bush of the casing 5 as viewed from the bottom surface 5c with respect to the bottom surface 5c of the trochoid receiving recess 5a, and (2) The position is lower than the seal surface 5d around the recess of the casing 5. This relationship is a positional relationship after the casing 5 is molded.
  • Projection amount h 1 from the bushing forming surface 5e of the end face 7a of the bush 7 is, for example, 0.01 mm ⁇ 0.3 mm. If the end surface 7a of the bush 7 protrudes even slightly, the above-described resin coating can be prevented.
  • the seal surface 5d is positioned higher than the end surface 7a of the bush 7, so that the seal surface 5d is in close contact with the cover preferentially when the bolt is fastened. Since it is defined as a positional relationship after molding, the seal surface 5d is always in contact with the cover regardless of molding conditions, the sealing performance of the trochoid-receiving recess 5a can be stably secured, and the discharge capacity is also stabilized. Moreover, since sufficient sealing performance can be ensured by the seal surface 5d, the seal ring conventionally disposed on the outer periphery of the seal surface 5d can be omitted as shown in FIGS.
  • the height of the end surface 7a of the bush 7 and the height of the seal surface 5d of the casing 5 may be the same.
  • the sealing performance at the seal surface 5d can be secured. Since the seal surface 5d and the cover can be more stably brought into contact with each other, the seal surface 5d is preferably positioned slightly higher than the end surface 7a.
  • the difference h 2 between the height of the sealing surface 5d of the height and the casing 5 of the end face 7a of the bush 7 is, for example, 0.01 mm ⁇ 0.3 mm.
  • the casing 5 is in sliding contact with the outer rotor 2 and the inner rotor 3 at the bottom surface 5c and the inner side surface 5b constituting the trochoid accommodating recess 5a. Since the inner side surface 5b of the trochoid-containing recess 5a is an injection-molded body portion of the resin composition, the frictional wear characteristic with the outer rotor 2 is excellent. Further, the bottom surface 5c of the trochoid-containing recess 5a is composed of a disk-shaped metal plate 8 integrated with the casing 5 by composite molding. Thereby, it is excellent in flatness compared with the case where the bottom face 5c is formed with resin, and the dispersion
  • the liquid suction nozzle 5h can be formed integrally with the casing 5 from the resin composition.
  • the filter 13 can be fixed by welding or the like to the end portion of the liquid suction nozzle 5h serving as a communication path inlet (liquid suction port) to the suction side volume chamber.
  • the filter 13 can prevent foreign matter from entering the pump.
  • the configuration of the trochoid-containing recess is not limited to the configuration shown in FIG. This is economical because the trochoid-containing recess can be formed without machining by injection molding.
  • FIG. 3A is an axial sectional view of the internal gear pump
  • FIG. 3B is an enlarged view around the seal surface of the casing in the internal gear pump.
  • the internal gear pump 1 has an annular groove 5f in a portion that seals the outer periphery of the trochoid-receiving recess 5a, and a seal ring 12 is provided in the groove 5f. Is assembled.
  • the other configuration is the same as that of the internal gear pump shown in FIG. As shown in FIG.
  • the seal surface 5d is a surface continuous from the inner surface 5b of the trochoid-containing recess 5a, and is in close contact with the surface of the cover to primarily seal the trochoid-containing recess 5a.
  • the height position of the end surface 7a on the cover side of the bush 7 is higher than the bush forming surface 5e around the bush of the casing 5 as viewed from the bottom surface 5c with respect to the bottom surface 5c of the trochoid receiving recess 5a, and ( 2) The position is lower than the seal surface 5d around the recess of the casing 5.
  • the projection amount h 1 from the bushing forming surface 5e of the end face 7a of the bush 7, the difference h 2 between the height of the sealing surface 5d of the height and the casing 5 of the end face 7a of the bush 7, respectively For example, it is set to 0.01 mm to 0.3 mm.
  • the material of the seal ring is not particularly limited, and a rubber material that matches the application and use environment such as hydrogenated nitrile rubber, fluorine rubber, and acrylic rubber may be selected.
  • a scroll compressor of an air conditioner is required to have heat resistance and oil resistance of about ⁇ 30 to 120 ° C. Therefore, it is preferable to use hydrogenated nitrile rubber (H—NBR system).
  • the resin composition forming the casing is made of a synthetic resin that can be injection-molded as a base resin.
  • the base resin include thermoplastic polyimide resin, polyether ketone resin, polyether ether ketone (PEEK) resin, polyphenylene sulfide (PPS) resin, polyamideimide resin, polyamide (PA) resin, and polybutylene terephthalate (PBT).
  • the resin include polyethylene terephthalate (PET) resin, polyethylene (PE) resin, polyacetal resin, and phenol resin. Each of these resins may be used alone or a polymer alloy in which two or more kinds are mixed.
  • PPS resin heat resistant resins, it is particularly preferable to use a PPS resin because the molded body is excellent in creep resistance, load resistance, wear resistance, chemical resistance, and the like.
  • Glass fiber, carbon fiber, or inorganic filler effective for high strength, high elasticity, high dimensional accuracy, imparting wear resistance and removing anisotropic injection molding shrinkage, alone or in combination as appropriate Is preferred.
  • the combined use of glass fiber and inorganic filler is excellent in economic efficiency and excellent in friction and wear characteristics in oil.
  • the first invention of the present application it is particularly preferable to use a resin composition in which a linear PPS resin is used as a base resin and glass fibers and glass beads are blended as a filler.
  • a resin composition in which a linear PPS resin is used as a base resin and glass fibers and glass beads are blended as a filler.
  • the oil resistance and chemical resistance are excellent, and the toughness is excellent.
  • the warpage of the flange portion is small, and the dimensional accuracy is greatly improved.
  • a rubber seal ring as shown in FIG. 2 it can be used suitably even in a high temperature atmosphere exceeding 120 ° C.
  • the means for mixing and kneading these raw materials is not particularly limited, and the powder raw material is dry-mixed with a Henschel mixer, ball mixer, ribbon blender, Redige mixer, Ultra Henschel mixer, etc., and further biaxially extruded. It is possible to obtain a molding pellet by melt-kneading with a melt extruder such as a machine. In addition, a side feed may be used for charging the filler when melt kneading with a twin screw extruder or the like.
  • a casing is formed by injection molding using the molding pellets. At the time of molding, a metal bush is disposed in the mold and integrated by composite molding. At the time of molding, the mold shape and molding conditions are set so that the above relationships (1) and (2) are satisfied after molding in the bush and the casing.
  • the cover can be made of the above-mentioned metal (iron, stainless steel, sintered metal, aluminum alloy, etc.) or resin (similar to the casing), It may be a composite molded product of metal and resin.
  • a sintered metal iron-based, copper-iron-based, copper-based, stainless-based, etc.
  • iron is particularly preferable from the viewpoint of price.
  • a trochoid pump that pumps water, chemicals, or the like may employ a stainless steel type that has a high rust prevention capability.
  • FIG. 5 is an axial sectional view of the internal gear pump.
  • the internal gear pump 41 includes a trochoid 44 in which an inner rotor 43 is accommodated in an annular outer rotor 42, a trochoid accommodating portion 46 that rotatably accommodates the trochoid 44, and the trochoid accommodating portion.
  • a casing 45 joined to and supported by the outside of 46 is provided.
  • the trochoid accommodating portion 46 includes a main body portion 47 having a cylindrical inner side surface 47 b and a flat plate-like inner bottom surface 47 c, and a lid portion 48 that closes the opening portion 47 a of the main body portion 47.
  • a drive shaft 49 is coaxially fixed to the center of rotation of the inner rotor 43.
  • the drive shaft 49 is supported by a bearing (not shown) provided in the casing 45 or the like.
  • the lid 48 and the casing 45 have an opening in a portion through which the drive shaft 49 passes.
  • the internal gear pump 41 is fastened and fixed to a member (not shown) of the equipment body by a bolt through a bolt fixing hole 50 formed in the flange 45b of the casing 45.
  • the outer teeth of the inner rotor 43 are one less than the inner teeth of the outer rotor 42, and the inner rotor 43 is housed in the outer rotor 42 in an eccentric state in which the outer teeth are inscribed in mesh with the inner teeth.
  • the suction-side and discharge-side volume chambers are formed according to the rotational direction of the trochoid 44.
  • a suction port communicating with the suction-side volume chamber and a discharge port communicating with the discharge-side volume chamber are formed on the inner bottom surface 47 c of the main body 47 of the trochoid accommodating portion 46 of the casing 45.
  • the trochoid 44 is rotated by the drive shaft 49, whereby the liquid is sucked from the suction port into the suction side volume chamber where the volume increases and becomes negative pressure.
  • the suction-side volume chamber changes to a discharge-side volume chamber in which the volume decreases and the internal pressure increases as the trochoid 44 rotates, and the sucked liquid is discharged from the discharge-side volume chamber to the discharge port.
  • the pumping action is continuously performed by the rotation of the trochoid 44, and the liquid is continuously pumped. Furthermore, due to the liquid sealing effect in which the sealing performance of each volume chamber is enhanced by the sucked liquid, the differential pressure generated between the volume chambers is increased, and a large pumping action is obtained.
  • the trochoid container 46 (main body 47 and lid 48) is made of sintered metal, and the casing 45 is an injection-molded body of a resin composition.
  • the trochoid container 46 and the casing 45 are integrated (insert molding) by composite molding by disposing the trochoid container 46 in a mold when the casing 45 is injection molded.
  • a part of the resin constituting the casing 45 enters into a part of the sintered pores on the outer surface of the trochoid accommodating portion that is a sintered body, and is firmly joined by the anchor effect. is there.
  • the casing 45 is formed so as to cover not only the main body 47 of the trochoid accommodating part 46 but also the lid part 48.
  • the inner rotor 43 and the outer rotor 42 are combined and inserted into the main body 47 of the trochoid housing 46 from the opening 47a side, and then the lid 48 is closed to include the rotor. It is assumed that the trochoid accommodating part 46 is.
  • the casing 45 can be formed so as to cover the lid portion 48 by arranging this in an injection mold and performing the above-described composite molding. With this structure, it is possible to prevent the lid 48 from being detached from the main body 47.
  • Examples of the sintered metal material that can be used for forming the trochoid housing 46 include iron-based, copper-iron-based, copper-based, and stainless-based materials. Since the price is low and the adhesiveness with the resin casing is excellent, it is preferable to employ a sintered metal whose main component is iron (which may include copper). Moreover, higher mechanical strength can be obtained by employing a sintered metal whose main component is iron. In addition, since copper is inferior to adhesiveness (adhesiveness) with resin rather than iron, when copper is included, the content of copper is preferably 10% by weight or less. More preferably, the copper content is 5% by weight or less. In addition, in the trochoid pump which pumps water, a chemical
  • the theoretical density ratio of the sintered metal is preferably 0.7 to 0.9. By setting the theoretical density ratio to 0.7 to 0.9, it has the required density to ensure the strength of the trochoid housing part, and the surface irregularities for firmly attaching the resin casing to the trochoid housing part (Sintered pores) can be secured.
  • the adjustment of the accommodating portion depth in the trochoid accommodating portion 46 can be performed by planarizing the axial cross section of the cylindrical side wall of the main body 47, and can be easily adjusted by machining.
  • the casing 45 is an injection-molded body of the resin composition, and the discharge amount design can be adjusted only by the trochoid housing part 46, the degree of freedom in designing the pump shape and the like is widened.
  • the liquid suction nozzle 45a can be formed integrally with the casing 45 with a resin composition. If necessary, a foreign matter mixing filter may be fixed to the end of the liquid suction nozzle 45a serving as a communication path inlet (liquid suction port) to the suction side volume chamber by welding or the like.
  • the resin composition forming the casing 45 is made of a synthetic resin that can be injection-molded as a base resin.
  • the base resin include thermoplastic polyimide resin, polyether ketone resin, polyether ether ketone (PEEK) resin, polyphenylene sulfide (PPS) resin, polyamideimide resin, polyamide (PA) resin, and polybutylene terephthalate (PBT).
  • the resin include polyethylene terephthalate (PET) resin, polyethylene (PE) resin, polyacetal resin, and phenol resin. Each of these resins may be used alone or a polymer alloy in which two or more kinds are mixed.
  • PPS resin heat resistant resins, it is particularly preferable to use a PPS resin because the molded body is excellent in creep resistance, load resistance, wear resistance, chemical resistance, and the like.
  • Glass fiber, carbon fiber, or inorganic filler effective for high strength, high elasticity, high dimensional accuracy, imparting wear resistance and removing anisotropic injection molding shrinkage, alone or in combination as appropriate Is preferred.
  • the combined use of glass fiber and inorganic filler is excellent in economic efficiency and excellent in friction and wear characteristics in oil.
  • a resin composition in which a linear PPS resin is used as a base resin and glass fibers and glass beads are blended as a filler.
  • the oil resistance and chemical resistance are excellent, and the toughness is excellent.
  • the warpage of the flange portion is small, and the dimensional accuracy is greatly improved.
  • it has an independent trochoid housing and does not require a conventional rubber seal ring, so it can be suitably used even in a high temperature atmosphere exceeding 120 ° C. Become.
  • the means for mixing and kneading these raw materials is not particularly limited, and the powder raw material is dry-mixed with a Henschel mixer, ball mixer, ribbon blender, Redige mixer, Ultra Henschel mixer, etc., and further biaxially extruded. It is possible to obtain a molding pellet by melt-kneading with a melt extruder such as a machine. In addition, a side feed may be used for charging the filler when melt kneading with a twin screw extruder or the like. A casing is formed by injection molding using the molding pellets. At the time of molding, the entire trochoid housing part or only the main body part is arranged in the mold and integrated by composite molding.
  • a sintered metal iron-based, copper-iron-based, copper-based, stainless-based, etc.
  • a sintered metal iron-based, copper-iron-based, copper-based, stainless-based, etc.
  • FIG. 6 is an axial sectional view of the internal gear pump.
  • the internal gear pump 41 has a structure in which the lid portion 48 is exposed from the casing 45.
  • the other configuration is the same as that of the internal gear pump shown in FIG.
  • each rotor can be inserted into the body portion 47 and the lid portion 48 can be closed.
  • the trochoid accommodating portion 46 including the rotor may be assembled and then molded with the casing.
  • FIG. 7 is an axial sectional view of the internal gear pump.
  • the internal gear pump 41 has a structure in which a lid portion 48 and a casing 45 are fastened by bolts 51. Thereby, in the trochoid accommodating part 46, the main-body part 47 and the cover part 48 are closely_contact
  • the other configuration is the same as that of the internal gear pump shown in FIG.
  • a metal bush may be interposed in the bolt fixing hole 50, and bolt fastening may be performed through the bush.
  • the rotor 47 is inserted into the main body 47 after the main body 47 and the casing 45 of the trochoid container 46 are combined. Then, it can manufacture in the procedure which bolts the cover part 48 with respect to the casing 45.
  • FIG. 7 is an axial sectional view of the internal gear pump.
  • the trochoid housing part is a separate part from the casing, and the casing is compounded around the trochoid housing part that has been manufactured by processing the housing part depth with high precision beforehand, so that both members are joined together. It has the structure. As a result, there is no variation in the discharge amount among the individual units, and the internal gear pump has a stable discharge capability.
  • the internal gear pumps according to the first and second inventions of the present application can be used as an internal gear pump (trochoid pump) that pumps liquid such as oil, water, and chemicals. It can be suitably used as a pump for supplying liquid to the sliding portion of a scroll compressor for an electric water heater, room air conditioner, or car air conditioner.
  • an internal gear pump tilted pump

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
PCT/JP2016/078755 2015-09-30 2016-09-29 内接歯車ポンプ WO2017057533A1 (ja)

Priority Applications (3)

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DE112016004484.4T DE112016004484T5 (de) 2015-09-30 2016-09-29 Innenzahnradpumpe
US15/764,666 US20180274539A1 (en) 2015-09-30 2016-09-29 Internal gear pump
CN201680057233.2A CN108138766B (zh) 2015-09-30 2016-09-29 内啮合齿轮泵

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JP2015-193292 2015-09-30
JP2015-193242 2015-09-30
JP2015193242A JP2017066975A (ja) 2015-09-30 2015-09-30 内接歯車ポンプ
JP2015193292A JP2017066976A (ja) 2015-09-30 2015-09-30 内接歯車ポンプ

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CN111566348A (zh) * 2017-11-30 2020-08-21 Ntn株式会社 内啮合齿轮泵
US11027404B2 (en) * 2018-07-19 2021-06-08 Milwaukee Electric Tool Corporation Lubricant-impregnated bushing for impact tool
WO2021124909A1 (ja) * 2019-12-19 2021-06-24 Ntn株式会社 樹脂成形体、樹脂発泡成形体、およびスクロールロータ

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US11448211B2 (en) 2018-08-31 2022-09-20 Toyoda Gosei Co., Ltd. Oil pump including gap between flange portion of tubular core and flange-opposing portion of resin housing
JP7188342B2 (ja) * 2019-09-27 2022-12-13 豊田合成株式会社 歯車ポンプ
DE112019008001T5 (de) * 2019-12-24 2022-10-27 Sumitomo Electric Industries, Ltd. Rotationspumpe
JP7290751B2 (ja) * 2019-12-24 2023-06-13 住友電工焼結合金株式会社 架橋フッ素樹脂コーティングロータの製造方法

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JPH0519730U (ja) * 1991-08-26 1993-03-12 三菱電線工業株式会社 シール装置
JPH09250640A (ja) * 1996-03-18 1997-09-22 Sakagami Seisakusho:Kk シールリング
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CN111566348A (zh) * 2017-11-30 2020-08-21 Ntn株式会社 内啮合齿轮泵
EP3719318A4 (de) * 2017-11-30 2021-04-21 NTN Corporation Interne getriebepumpe
US11027404B2 (en) * 2018-07-19 2021-06-08 Milwaukee Electric Tool Corporation Lubricant-impregnated bushing for impact tool
US11975435B2 (en) 2018-07-19 2024-05-07 Milwaukee Electric Tool Corporation Lubricant-impregnated bushing for impact tool
WO2021124909A1 (ja) * 2019-12-19 2021-06-24 Ntn株式会社 樹脂成形体、樹脂発泡成形体、およびスクロールロータ

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CN108138766B (zh) 2020-03-31
CN110360096A (zh) 2019-10-22
US20180274539A1 (en) 2018-09-27
CN108138766A (zh) 2018-06-08
DE112016004484T5 (de) 2018-06-14

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