WO2011155311A1 - 緩衝部材、軸連結構造体、及び一軸偏心ねじポンプ - Google Patents
緩衝部材、軸連結構造体、及び一軸偏心ねじポンプ Download PDFInfo
- Publication number
- WO2011155311A1 WO2011155311A1 PCT/JP2011/061710 JP2011061710W WO2011155311A1 WO 2011155311 A1 WO2011155311 A1 WO 2011155311A1 JP 2011061710 W JP2011061710 W JP 2011061710W WO 2011155311 A1 WO2011155311 A1 WO 2011155311A1
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- WIPO (PCT)
- Prior art keywords
- shaft
- buffer member
- passive
- main body
- output shaft
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
- F16D3/12—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted for accumulation of energy to absorb shocks or vibration
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- 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
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
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- 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
- F04C2/107—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 with helical teeth
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- 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
- F04C2/107—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 with helical teeth
- F04C2/1071—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 with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/0876—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with axial keys and no other radial clamping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
- F16D3/56—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members comprising elastic metal lamellae, elastic rods, or the like, e.g. arranged radially or parallel to the axis, the members being shear-loaded collectively by the total load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D2001/062—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end characterised by adaptors where hub bores being larger than the shaft
Definitions
- the present invention relates to a buffer member inserted between an output shaft that rotates in response to an output from a driving machine such as a motor, and a passive shaft connected thereto, and a shaft coupling structure including the buffer member, And a uniaxial eccentric screw pump provided with the shaft coupling structure.
- the conventional single-shaft eccentric screw pump described above has a structure in which a radial load or a thrust load generated on the passive machine (pump main body) side is received by a bearing provided inside the drive machine. Therefore, when a large load is generated, the load capacity of the bearing may be insufficient, and in some cases, it is necessary to select a special driving machine or a large driving machine.
- the passive shaft can be supported by rotation with a bearing to receive a large load generated on the passive machine side.
- the bearings provided on the passive device side and the drive device side are connected substantially in one shaft, so-called It will be in the state of 3 point support or 4 point support. In such a state, there is a possibility that a mechanical design problem may occur due to an excessive load acting on the shaft itself or the bearing itself only by a slight deviation in the mounting of the shaft or the bearing.
- the output shaft and the passive shaft can be easily connected so as not to cause misalignment or shakiness of the shaft center, and an external force acts directly from one shaft to the other shaft.
- An object of the present invention is to provide a buffer member capable of suppressing the influence of heat conduction and thermal expansion and avoiding the selection of an over-performance drive machine, and a uniaxial eccentric screw pump provided with the buffer member It was.
- the buffer member of the present invention provided to solve the above-described problems includes an output shaft provided on the drive machine side, and a passive machine provided on the passive machine side that operates when power is transmitted from the drive machine side. It is inserted between the shafts, and the output shaft and the passive shaft can be connected in the axial direction.
- the shock-absorbing member of the present invention is made of resin and has a cylindrical shock-absorbing member main body and a coupling means.
- the buffer member main body can be fitted and coupled so as to be able to transmit torque with the shaft A by being inserted into the end portion of the shaft A, and an insertion portion capable of inserting the end portion of the shaft B.
- the coupling means couples the shaft B inserted into the insertion portion and the buffer member body so as to be integrally rotatable.
- the buffer member of the present invention is preferably such that the buffer member main body is fitted and coupled with the shaft A in a state of clearance fitting.
- the shock-absorbing member of the present invention has a shock-absorbing member insertion portion capable of inserting the shock-absorbing member body in the axial direction at an end, and a fitting groove extending in the axial direction on an inner peripheral surface of the shock-absorbing member insertion portion.
- a fitting crest that is inserted with respect to the formed shaft A and that extends in the axial direction and projects outward in the radial direction is formed on the outer peripheral surface of the buffer member body.
- the shaft coupling structure of the present invention provided to solve the same problem includes an output shaft provided on the drive machine side, a passive shaft provided on the passive machine side, and the above-described buffer member of the present invention. I have it.
- the shaft coupling structure of the present invention when one of the output shaft and the passive shaft is the shaft A and the other is the shaft B, the buffer member body is inserted into an end portion of the shaft A, and the shaft A And the buffer member main body are fitted and coupled so that torque can be transmitted, and an end of the shaft B is inserted into an insertion portion formed in the buffer member main body, and the shaft B and The buffer member main body is coupled.
- the passive shaft is supported so as to be rotatable by a bearing capable of receiving at least a thrust load.
- the shaft coupling structure of the present invention is provided with a buffer member insertion portion capable of inserting the buffer member main body in the axial direction at the end of the shaft A, and in the axial direction on the outer peripheral surface of the buffer member main body.
- a fitting crest that extends and protrudes radially outward is formed, and a fitting groove that can be fitted to the fitting crest and extends in the axial direction is formed on the inner peripheral surface of the cushioning member insertion portion. It may be formed.
- the coupling means can be constituted by a key and a key groove.
- the single-shaft eccentric screw pump includes a drive unit capable of generating rotational power, a power transmission mechanism unit for transmitting rotational power input from the drive unit, and the power transmission mechanism unit.
- the output shaft provided in the drive machine and the passive shaft provided in the power transmission mechanism section are connected by the above-described shaft connection structure of the present invention. It is a feature.
- the buffer member of the present invention is prepared separately from the output shaft and the passive shaft and these shafts are connected, the output shaft and the passive shaft can be easily separated and connected. In particular, the work of removing the drive machine from the passive machine side for inspection and maintenance and the work of connecting the drive machine to the passive machine side are facilitated. Further, by using the cushioning member of the present invention as a consumable part or a replacement part, it is possible to perform operations such as connection and disassembly without damaging the output shaft and the passive shaft, which can contribute to reduction of running cost. It becomes possible.
- the buffer member body is made of resin, and is interposed between the output shaft and the passive shaft. For this reason, even if the output shaft and passive shaft are made of metal, direct contact between them is avoided, and wear phenomena such as so-called fretting wear, as well as damage and fretting / corrosion caused by this phenomenon occur. Can solve such problems. Furthermore, even if impact force or vibration acts in the axial direction from the shaft on one side of the output shaft and the passive shaft by making the buffer member body made of resin, these are received by the buffer member body, and in some cases, the buffer member When the main body itself is damaged, it is possible to prevent a large external force from acting in the axial direction on the other side shaft. That is, the buffer member of the present invention exhibits a function as a so-called crushable element, and can elastically absorb and mitigate an impact force or vibration acting in the axial direction.
- the shock-absorbing member of the present invention has a shock-absorbing member body made of resin and has lower thermal conductivity than metal. Therefore, the heat transfer from one side of the output shaft and the passive shaft to the other side can be suppressed by the buffer member of the present invention. Occurrence can also be prevented.
- the cushioning member of the present invention is one in which the cushioning member main body and the shaft A are fitted and coupled in a state of clearance fitting (floating fitting), the driving machine and the passive machine can be easily separated. It is. Therefore, if the shock-absorbing member of the present invention is used for fastening the shafts of the driving machine and the passive machine, it becomes very easy to perform maintenance and inspection of the driving machine alone.
- the shaft coupling structure of the present invention is obtained by coupling an output shaft provided on the drive machine side and a passive shaft provided on the passive machine side by a buffer member.
- the buffer member is a crushable element. Therefore, a consumable / replaced part can be easily specified.
- the buffer member can be easily attached to and detached from the axes A and B. Therefore, the shaft coupling structure of the present invention can use the buffer member as a consumable part or a replacement part, and can minimize the labor and running cost required for maintenance.
- the buffer member employed in the shaft coupling structure of the present invention is a case where a metal member is employed as the output shaft or the passive shaft (axis A, B) because the buffer member body is made of resin. Even if it exists, the secondary problem accompanying wear, such as generation
- the shaft coupling structure of the present invention is provided with a buffer member insertion portion at the end of the shaft A, and a fitting groove is formed on the inner peripheral surface so as to extend in the axial direction.
- a fitting mountain extending in the axial direction and projecting radially outward is formed on the outer peripheral surface of the buffer member body, and the buffer member body is inserted in the buffer member insertion portion in the axial direction. Thereby, it can be set as the state which fitted the fitting mountain and the fitting groove.
- the shaft coupling structure of the present invention When the passive shaft is supported so as to be rotatable by a bearing capable of receiving at least a thrust load, the shaft coupling structure of the present invention has an axial direction acting from the passive device side toward the drive device side. The acting impact force and vibration can be received by the bearing, and it is not necessary to consider the allowable load of the bearing built in the driving machine. Therefore, if the drive shaft and the passive shaft are connected by the shaft connection structure of the present invention, it is not necessary to select a drive device with excessive performance in consideration of the load. In addition, since the passive shaft is supported by the bearing, there is no need to prepare jigs and tools to support the passive shaft when the drive machine and the passive machine are separated, saving labor and time required for maintenance. It can be minimized.
- the shaft coupling structure of the present invention is configured such that the coupling means is constituted by a key and a key groove, so that the shaft B and the buffer member main body can rotate integrally while having a simple configuration. It becomes possible to combine them.
- the output shaft provided in the drive unit and the passive shaft provided in the power transmission mechanism are connected by the above-described shaft connecting structure, so that the output shaft and the passive shaft are Can be easily connected so that torque can be transmitted.
- the buffer member used in the shaft coupling structure can be used as a consumable part or a replacement part used for coupling the output shaft and the passive shaft. Therefore, the running cost can be suppressed.
- the buffer member main body forming the buffer member is made of resin, problems such as fretting wear, problems associated therewith, specifically occurrence of fretting and corrosion, etc. Less prone to secondary problems.
- the impact force or vibration is elastically absorbed by the resin buffer member body. Can be received and reduced.
- the buffer member main body is made of resin, heat transfer between the passive shaft and the output shaft is mitigated by the buffer member provided in the middle.
- the uniaxial eccentric screw pump 10 the shaft coupling structure 80, and the buffer member 82 according to an embodiment of the present invention will be described in detail with reference to the drawings.
- the uniaxial eccentric screw pump 10 has the characteristics in the shaft connection structure 80 and the buffer member 82, in the following description, the whole structure is demonstrated prior to these description.
- the uniaxial eccentric screw pump 10 is a so-called rotary displacement pump. As shown in FIG. 1, the uniaxial eccentric screw pump 10 includes a stator 20, a rotor 30, a power transmission mechanism unit 50, and the like housed in a casing 12, and a driving machine 70 (driving machine) attached to the outside of the casing 12. ) Can be operated by the power transmitted from. That is, the uniaxial eccentric screw pump 10 constitutes the passive machine 11 that operates by receiving power from the drive machine 70 on the casing 12 side, and the drive machine 70 and the passive machine 11 are in the axial direction (axial direction). It is set as the structure connected to the shaft.
- the casing 12 is a cylindrical member made of metal, and a first opening 14a is provided in a disc-shaped end stud 12a attached to one end in the longitudinal direction. Further, a second opening 14 b is provided in the outer peripheral portion of the casing 12. The second opening 14 b communicates with the internal space of the casing 12 at an intermediate portion 12 d located at the intermediate portion in the longitudinal direction of the casing 12.
- the first and second openings 14a and 14b are portions that function as a suction port and a discharge port of the uniaxial eccentric screw pump 10, respectively. More specifically, in the uniaxial eccentric screw pump 10 of the present embodiment, the first opening 14a functions as a discharge port and the second opening 14b functions as a suction port by rotating the rotor 30 in the forward direction. It is possible to pump a fluid (fluid) into the pipe. On the contrary, the uniaxial eccentric screw pump 10 rotates the rotor 30 in the reverse direction so that the first opening 14a functions as a suction port and the second opening 14b functions as a discharge port. Can be pumped.
- the stator 20 is a member that is made of an elastic body typified by rubber or resin, and has a substantially cylindrical appearance.
- the material of the stator 20 is appropriately selected according to the type and properties of the fluid that is the object to be transferred using the uniaxial eccentric screw pump 10.
- the stator 20 is accommodated in the stator attachment portion 12b in the casing 12 at a position adjacent to the first opening 14a.
- the outer diameter of the stator 20 is substantially the same as the inner diameter of the stator attachment portion 12b. Therefore, the stator 20 is mounted such that the outer peripheral surface thereof is in close contact with the inner peripheral surface of the stator mounting portion 12b.
- stator 20 is fixed by sandwiching a flange portion 20a on one end side by an end stud 12a at an end portion of the casing 12, and attaching and tightening a stay bolt 16 across the end stud 12a and the main body portion of the casing 12. ing. Therefore, the stator 20 does not cause a position shift or the like in the stator attachment portion 12b of the casing 12.
- the inner peripheral surface 24 of the stator 20 is formed into a multistage female screw shape with two strips.
- the rotor 30 is a metal shaft, and has a single-stage multi-stage male screw shape.
- the rotor 30 is formed so that the cross-sectional shape thereof is almost a perfect circle when viewed in cross section at any position in the longitudinal direction.
- the rotor 30 is inserted into the through hole 22 formed in the stator 20 described above, and can be freely rotated eccentrically inside the through hole 22.
- a fluid conveyance path 40 is formed between the inner peripheral surface 24 of the stator 20 forming the through hole 22 and the outer peripheral surface of the rotor 30.
- the fluid conveyance path 40 has a length d times the reference length S of the lead in the axial direction of the stator 20 or the rotor 30 when the length L of the lead of the stator 20 or the rotor 30 is set as the reference length S. It is a multistage (d stage) flow path.
- the fluid conveyance path 40 extends spirally in the longitudinal direction of the stator 20 and the rotor 30. Further, when the rotor 30 is rotated in the through hole 22 of the stator 20, the fluid conveyance path 40 advances in the longitudinal direction of the stator 20 while rotating in the stator 20. Therefore, when the rotor 30 is rotated, the fluid is sucked into the fluid conveyance path 40 from one end side of the stator 20, and the fluid is confined in the fluid conveyance path 40 toward the other end side of the stator 20. It is possible to transport and discharge at the other end side of the stator 20. That is, when the rotor 30 is rotated in the forward direction, the fluid sucked from the second opening 14b can be pumped and discharged from the first opening 14a. Further, when the rotor 30 is rotated in the reverse direction, the fluid sucked from the first opening 14a can be discharged from the second opening 14b.
- the power transmission mechanism unit 50 is provided to transmit power to the rotor 30 described above from a driving machine (not shown) such as a motor provided outside the casing 12.
- the power transmission mechanism unit 50 includes a power connection unit 52 and an eccentric rotation unit 54.
- the power connection portion 52 is one end side in the longitudinal direction of the casing 12, more specifically, the side opposite to the end stud 12a and the stator mounting portion 12b described above (hereinafter also simply referred to as “base end side”). It is provided in the shaft accommodating part 12c provided in the.
- the eccentric rotation part 54 is provided in the intermediate part 12d formed between the shaft accommodating part 12c and the stator attachment part 12b.
- the power connection unit 52 has a drive shaft 56, which is supported by two bearings 58a and 58b so as to be freely rotatable.
- the bearings 58a and 58b can receive at least a thrust load.
- a thrust bearing can be suitably used.
- the drive shaft 56 is taken out from the closed portion on the proximal end side of the casing 12 and connected to a drive machine. Therefore, the drive shaft 56 can be rotated by operating the drive machine.
- a shaft sealing device 60 made of, for example, a mechanical seal or a gland packing is provided between the shaft housing portion 12c provided with the power connection portion 52 and the intermediate portion 12d. It is set as the structure where the fluid which is a to-be-conveyed object does not leak to the part 12c side.
- the eccentric rotating part 54 is a part that connects the drive shaft 56 (passive axis, axis A) described above and the rotor 30 so that power can be transmitted.
- the eccentric rotating part 54 has a pivot 62 and two universal joints 64 and 64.
- the pivot 62 is constituted by a conventionally known coupling rod, screw rod, or the like.
- the universal joints 64 and 64 connect the pivot 62 and the rotor 30, and the pivot 62 and the drive shaft 56, respectively.
- the universal joints 64 and 64 transmit the rotational power transmitted via the drive shaft 56 to the rotor 30 and can rotate the rotor 30 eccentrically.
- the drive shaft 56 is a shaft that is connected to the drive unit 70 via a buffer member 82 described in detail later. As shown in FIG. 3, the drive shaft 56 includes a hollow buffer member insertion portion 56 a that can insert the buffer member 82 in the axial direction at the end. A fitting groove 56b is formed on the inner peripheral surface of the buffer member insertion portion 56a so as to extend linearly in the axial direction. Four fitting grooves 56b are provided in the circumferential direction of the buffer member insertion portion 56a, approximately at equal intervals, that is, approximately every 90 degrees.
- the driving machine 70 is configured by a conventionally known motor and includes an output shaft 70a (axis B) for outputting rotational power.
- the output shaft 70a is coupled to the drive shaft 56 via a buffer member 82 that is a component of the shaft coupling structure 80.
- the output shaft 70a is provided with a keyway 70b.
- the shaft coupling structure 80 which is a characteristic part of the uniaxial eccentric screw pump 10, and the buffer member 82 used therein will be described in detail.
- the shaft coupling structure 80 is configured by coupling the drive shaft 56 and the output shaft 70 a described above in the axial direction via a buffer member 82.
- the buffer member 82 includes a buffer member main body 84 and a coupling means 90.
- the buffer member body 84 is made of resin and has a cylindrical appearance.
- the buffer member body 84 has an outer diameter that is slightly smaller than the inner diameter of the buffer member insertion portion 56a provided at the end of the drive shaft 56 (axis A). By being inserted into the member insertion portion 56a, a gap is fitted (free fitting).
- a fitting mountain 86 is formed on the outer peripheral surface of the buffer member main body 84, and an insertion portion 88 is formed on the inner side.
- the fitting ridge 86 is a rib-like protrusion that protrudes outward in the radial direction of the buffer member main body 84 and has a substantially semicircular cross-sectional shape and extends in the axial direction.
- the fitting peaks 86 are provided at three locations in the circumferential direction of the buffer member main body 84. Specifically, when the three fitting ridges 86 are the fitting ridges 86a, 86b, 86c, the fitting ridges 86a, 86b and the fitting ridges 86b, 86c are respectively positioned approximately 90 degrees in the circumferential direction.
- the fitting peaks 86a and 86c are provided at positions that are separated by approximately 180 degrees in the circumferential direction. Therefore, when the cushioning member main body 84 is inserted into the cushioning member insertion portion 56a provided on the drive shaft 56, the three fitting grooves 86a, 86b, 86c is inserted, and it is in a state of loose fitting (gap fitting). Thereby, the buffer member main body 84 is in a state in which it can rotate integrally with the drive shaft 56.
- the inner diameter of the insertion portion 88 formed on the inner side of the buffer member body 84 is substantially the same as the outer diameter of the output shaft 70a of the drive unit 70 described above. Therefore, it is possible to insert the output shaft 70a into the insertion portion 88 without a substantial gap. That is, the output shaft 70 a is press-fitted into the insertion portion 88. Further, an opening 84 a for inserting the key 92 is provided on the outer peripheral portion of the buffer member main body 84. The key 92 constitutes the coupling means 90 in combination with a key groove 70b provided on the output shaft 70a.
- the buffer member main body 84 and the output shaft 70a can be coupled by inserting the key 92 from the opening 84a. Is possible.
- the shaft coupling structure 80 employed in the uniaxial eccentric screw pump 10 of this embodiment includes the output shaft 70a provided on the drive unit 70 side and the drive shaft 56 provided on the casing 12 side.
- a buffer member 82 is interposed and connected. That is, since the single-shaft eccentric screw pump 10 has these shafts connected by the buffer member 82 prepared separately from the drive shaft 56 and the output shaft 70a, it is easier than the case of shrink fitting as in the prior art. Both shafts can be connected and disassembled, and operations such as maintenance and inspection can be performed efficiently. Further, in the single-shaft eccentric screw pump 10, by using the buffer member 82 as a consumable part or a replacement part, the drive shaft 56 and the output shaft 70a can be used without being damaged, and the running cost is minimized. can do.
- a resin-made buffer member main body 84 is interposed between the metal drive shaft 56 and the output shaft 70a, and both shafts are directly connected at the coupling portion. There is no contact. Therefore, even if the uniaxial eccentric screw pump 10 is driven, secondary problems such as occurrence of fretting wear and occurrence of fretting / corrosion between the drive shaft 56 and the output shaft 70a do not occur.
- the buffer member main body 84 is made of resin, when an impact force or vibration is generated from either one of the output shaft 70a and the drive shaft 56, these influences are alleviated, and the other shaft Can be prevented from being transmitted. Furthermore, since the buffer member 82 is made of resin and has lower thermal conductivity than the metal output shaft 70a and the drive shaft 56, heat transfer from one side to the other side of the drive shaft 56 and the output shaft 70a Secondary problems associated with heat transfer can be prevented. Specifically, the heat generated in the driving machine 70 propagates to the fluid flowing on the casing 12 side and adversely affects the fluid, and conversely, the heat of the fluid flows to the driving machine. Problems such as propagation to the 70 side and adverse effects on the drive unit 70 are unlikely to occur.
- the uniaxial eccentric screw pump 10 is configured such that the buffer member main body 84 of the buffer member 82 and the drive shaft 56 are fitted and coupled in a state of clearance fitting (floating fitting). And the passive device 11 can be easily separated as necessary.
- the single-shaft eccentric screw pump 10 prepares a jig for supporting the drive shaft 56 when the drive machine 70 is removed from the passive machine 11, and the like. Therefore, the labor and time required for maintenance can be minimized.
- the bearings 58a and 58b may be any bearing that can receive at least a load in the thrust direction, and can receive both a radial load and a load in the thrust direction in addition to the thrust bearing. It may be a thing.
- the fitting groove 56b formed on the inner peripheral surface of the buffer member insertion portion 56a and the fitting mountain 86 formed on the outer peripheral surface of the buffer member 82 are both formed to extend in the axial direction. Then, by inserting the fitting mountain 86 into the fitting groove 56b, the fitting mountain 86 and the fitting groove 56b are fitted and coupled, and the drive shaft 56 and the buffer member 82 are connected so that torque can be transmitted. Can do. Further, when the drive shaft 56 and the buffer member 82 are connected in this way, it is possible to have an axial play between the drive shaft 56 and the buffer member 82. An external force acting in the axial direction can be released.
- connection structure of the drive shaft 56 and the buffer member main body 84 constituted by the fitting groove 56b and the fitting mountain 86 described above is merely an example of the present invention, and any structure capable of transmitting torque can be used. It is good also as connecting by another structure.
- a recess 85 (or groove) is provided at a position corresponding to the fitting groove 56b provided on the inner peripheral surface of the drive shaft 56 on the outer peripheral surface of the buffer member main body 84.
- a configuration may be adopted in which a non-metallic pin 96 such as a resin is inserted between the recess 85 and the fitting groove 56b so that the shock-absorbing member main body 84 and the drive shaft 56 are connected so that power can be transmitted.
- the buffer member main body 84 and the output shaft 70a are coupled using the coupling means 90 including the key 92 and the key groove 70b, the output shaft 70a and the buffer member main body 84 are configured with a simple configuration. Can be reliably combined.
- the example in which the combination of the key 92 and the key groove 70b is used as the coupling means 90 is illustrated, but the present invention is not limited to this, and for example, a pin, a bolt, or the like is used as the coupling means 90. It may be used.
- the buffer member main body 84 is coupled (attached) to the output shaft 70a of the driving machine 70 using the coupling means 90, and the buffer member main body 84 is fitted and coupled to the drive shaft 56.
- the buffer member main body 84 is provided on the output shaft 70a side of the drive machine 70 by providing the buffer member insertion portion 56a described above, and the end portion of the drive shaft 56 corresponding to the coupling means 90.
- the output shaft 70a and the drive shaft 56 may be connected by mounting and fitting the buffer member main body 84 into the buffer member insertion portion 56a and fitting and coupling them. Even in the case of such a configuration, the same effects as those shown in the present embodiment can be obtained.
- the present invention is not limited to this, and the quantity of both may be the same.
- channel 56b illustrated a semicircle thing, respectively, this invention is not limited to this, Appropriate, such as substantially rectangular shape, is appropriate. It can be shaped.
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Abstract
Description
一軸偏心ねじポンプ10は、いわゆる回転容積型のポンプである。一軸偏心ねじポンプ10は、図1に示すように、ケーシング12の内部にステータ20や、ロータ30、動力伝達機構部50などが収容され、ケーシング12の外部に取り付けられた駆動機70(駆動機)から伝達される動力により作動可能とされている。すなわち、一軸偏心ねじポンプ10は、ケーシング12側の部分が駆動機70から動力を受けて作動する受動機11を構成するものであり、駆動機70と受動機11とが軸方向(アキシャル方向)に軸連結された構成とされている。
続いて、一軸偏心ねじポンプ10の特徴的部分である軸連結構造体80及びこれに用いられている緩衝部材82について詳細に説明する。図3や図4に示すように、軸連結構造体80は、上述したドライブシャフト56と出力軸70aとを緩衝部材82を介して軸方向に連結することにより構成されるものである。
20 ステータ
30 ロータ
56 ドライブシャフト(受動軸,軸A)
56a 緩衝部材内挿部
56b 嵌合溝
70 駆動機(駆動機)
70a 出力軸(軸B)
70b キー溝
80 軸連結構造体
82 緩衝部材
84 緩衝部材本体
86 嵌合山
88 内挿部
90 結合手段
92 キー
Claims (8)
- 駆動機側に設けられた出力軸と、前記駆動機側から動力が伝達されることにより作動する受動機側に設けられた受動軸の間に介挿され、前記出力軸及び前記受動軸を軸方向に連結可能な緩衝部材であって、
樹脂製であって筒状の緩衝部材本体と、結合手段とを有し、
前記出力軸及び前記受動軸の一方を軸A、他方を軸Bとしたときに、
前記緩衝部材本体が、前記軸Aの端部に内挿することにより前記軸Aとトルク伝達可能なように嵌合結合可能であるとともに、前記軸Bの端部を内挿可能な内挿部を備えたものであり、
前記結合手段が、前記内挿部に内挿された前記軸B及び前記緩衝部材本体を一体的に回転可能なように結合させるものであることを特徴とする緩衝部材。 - 前記緩衝部材本体が、前記軸Aと隙間嵌めの状態で嵌合結合することを特徴とする請求項1に記載の緩衝部材。
- 前記緩衝部材本体を軸方向に内挿可能な緩衝部材内挿部を端部に有し、前記緩衝部材内挿部の内周面に軸方向に延びる嵌合溝が形成された軸Aに対して内挿されるものであり、
前記緩衝部材本体の外周面に、軸方向に延び、径方向外側に向けて突出した嵌合山が形成されており、
前記緩衝部材内挿部に内挿することにより、前記嵌合山と前記嵌合溝とがトルク伝達可能なように嵌合結合された状態になることを特徴とする請求項1又は2に記載の緩衝部材。 - 駆動機側に設けられた出力軸と、
受動機側に設けられた受動軸と、
請求項1~3のいずれかに記載の緩衝部材とを有し、
前記出力軸及び前記受動軸の一方を軸A、他方を軸Bとしたときに、
前記軸Aの端部に前記緩衝部材本体が内挿され、前記軸Aと緩衝部材本体とがトルク伝達可能なように嵌合結合されており、
前記軸Bの端部が前記緩衝部材本体に形成された内挿部に内挿され、前記結合手段により前記軸B及び前記緩衝部材本体が結合されていることを特徴とする軸連結構造体。 - 前記受動軸が、少なくともスラスト荷重を受けることが可能な軸受によって回転可能なように支持されていることを特徴とする請求項4に記載の軸連結構造体。
- 軸Aの端部に、緩衝部材本体を軸方向に内挿可能な緩衝部材内挿部が設けられており、
前記緩衝部材本体の外周面に、軸方向に延び、径方向外側に向けて突出した嵌合山が形成されており、
前記緩衝部材内挿部の内周面に、前記嵌合山と嵌合可能であって軸方向に延びる嵌合溝が形成されていることを特徴とする請求項4又は5に記載の軸連結構造体。 - 結合手段が、キー及びキー溝によって構成されていることを特徴とする請求項4~6のいずれかに記載の軸連結構造体。
- 回転動力を発生させることが可能な駆動機と、
前記駆動機から入力された回転動力を伝達するための動力伝達機構部と、
前記動力伝達機構部を介して伝達された回転動力により駆動されて偏心回転する雄ねじ型のロータと、
前記ロータを挿通可能であり、内周面が雌ねじ型に形成されたステータとを備えており、
前記駆動機に設けられた出力軸と、前記動力伝達機構部に設けられた受動軸とが、請求項4~7のいずれかに記載の軸連結構造体によって連結されていることを特徴とする一軸偏心ねじポンプ。
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CN201180027917.5A CN103038526B (zh) | 2010-06-09 | 2011-05-23 | 缓冲部件、轴连接结构体以及一轴偏心螺旋泵 |
KR1020137000542A KR101832525B1 (ko) | 2010-06-09 | 2011-05-23 | 완충 부재, 축 연결 구조체 및 일축 편심 나사 펌프 |
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TWI649497B (zh) * | 2014-11-14 | 2019-02-01 | 日商兵神裝備股份有限公司 | 流動體搬送裝置 |
CN113883179A (zh) * | 2020-07-02 | 2022-01-04 | 阿自倍尔株式会社 | 轴联结装置 |
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JP2021096176A (ja) * | 2019-12-18 | 2021-06-24 | 日立Geニュークリア・エナジー株式会社 | インターナルポンプ及び原子力発電プラント |
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