WO-2026094829-A1 - UNIAXIAL ECCENTRIC SCREW PUMP

WO2026094829A1WO 2026094829 A1WO2026094829 A1WO 2026094829A1WO-2026094829-A1

Abstract

[Problem] To provide a uniaxial eccentric screw pump with which an interference or a clearance between a rotor and a stator can be easily adjusted, and which can be automated. [Solution] This uniaxial eccentric screw pump 1 comprises an input shaft 60 rotated by the power of a drive machine, a rotor 5 connected to the input shaft 60 in an eccentrically rotatable manner, a joint section 9 that connects the input shaft 60 and the rotor 5 directly or indirectly via a joint shaft 7, and a stator 12 into which the rotor 5 can be inserted. The outer diameter of the rotor 5 and/or the inner diameter of an inner hole 12a of the stator 12 can be formed so as to decrease from one end toward the other end, and/or the amount of eccentricity of the rotor can be changed. The input shaft 60, the joint shaft 7, and/or the joint section 9 is provided with an expansion/contraction mechanism 50 that causes the rotor 5 to move toward and away from the stator 12 by expanding and contracting in the axial direction.

Inventors

SUHARA, NOBUHISA
SATO, TAKASHI
KASUI, Kenji

Assignees

兵神装備株式会社

Dates

Publication Date: 20260507
Application Date: 20251024
Priority Date: 20241028

Claims (19)

An input shaft that rotates due to the power of the drive mechanism, A rotor, which is connected to the input shaft so as to be eccentrically rotatable and is composed of a male screw-type shaft body, A joint portion that connects the input shaft and the rotor directly or indirectly via a joint shaft, A stator formed in the shape of an internal screw through which the rotor can be inserted, Equipped with, Either the outer diameter of the rotor and the inner diameter of the inner bore of the stator, or both, can be formed to decrease in size from one end to the other, or the eccentricity of the rotor can be varied, or both. A single-screw eccentric pump characterized in that at least one of the input shaft, the joint shaft, and the joint portion is provided with an extension/retraction mechanism that causes the rotor to move closer to or further away from the stator by extending or retracting in the axial direction.
Either the input shaft or the joint shaft, or both, An outer shaft with a hollow hole formed along the axial direction, An inner shaft inserted through the hollow hole and movable relative to the outer shaft along the axial direction, Equipped with, The telescopic mechanism includes an adjustment member that changes the relative positional relationship between the inner shaft and the outer shaft in the axial direction. The single-axis eccentric screw pump according to claim 1, characterized in that the input shaft or the joint shaft, or both, are extended or retracted by moving the inner shaft and the outer shaft relative to each other via the adjustment member.
The single-screw eccentric pump according to claim 2, characterized in that a locking mechanism is provided that allows the relative positional relationship between the inner shaft and the outer shaft to be changed in the unlocked state, and fixes the inner shaft and the outer shaft so that they cannot move relative to each other in the locked state.
The adjusting member is positioned between the inner shaft and the outer shaft, suppresses relative movement of the inner shaft and the outer shaft along the axial direction, and is detachably attached to at least one of the inner shaft and the outer shaft. The single-screw eccentric pump according to claim 2 or 3, characterized in that the relative amount of axial movement of the inner shaft and the outer shaft can be changed by attaching or detaching the adjustment member.
The single-screw eccentric pump according to claim 2 or 3, characterized in that the adjusting member is made of an elastic material.
The outer shaft has a threaded portion formed on the inner surface of the hollow hole at a position corresponding to the adjustment member. The adjusting member has a bolt, and the bolt is screwed into the threaded portion. The single-screw eccentric pump according to claim 2 or 3, characterized in that the relative amount of movement between the inner shaft and the outer shaft can be changed by adjusting the screwing position of the bolt.
The adjustment member is a clamp member capable of gripping the inner shaft, The clamp member is In a state where the inner shaft is not being gripped, the inner shaft and the outer shaft are made to be able to move relative to each other. The single-screw eccentric pump according to claim 2, characterized in that, when the inner shaft is gripped, the inner shaft and the outer shaft are made immobile relative to each other.
The aforementioned inner shaft is It is provided with an elongated hole formed longitudinally along the axial direction, or a plurality of shaft-side locking holes formed at intervals along the axial direction of the input shaft, The clamp member is It is provided with a clamp-side locking hole that corresponds to at least one of the elongated hole or the shaft-side locking hole, The single-screw eccentric pump according to claim 7, characterized in that the inner shaft and the outer shaft are locked so as not to rotate relative to each other by inserting the shaft member through the clamp-side locking hole into the shaft-side locking hole.
Either the input shaft or the joint shaft, or both, are divided and formed into at least a first shaft and a second shaft along the axial direction. The telescopic mechanism includes a plurality of adjustment members of different lengths to which the first axis and the second axis can be connected. The single-axis eccentric screw pump according to claim 1, characterized in that the input shaft or the joint shaft, or either one or both, are extended or retracted in the axial direction by connecting the first shaft and the second shaft via at least one selected from a plurality of adjustment members.
Either the input shaft or the joint shaft, or both, are divided and formed into at least a first shaft and a second shaft along the axial direction. The telescopic mechanism includes an adjustment member to which the first axis and the second axis can be connected. The adjustment member is configured to change its connection position along the axial direction with respect to at least one or both of the first shaft and the second shaft. The single-axis eccentric screw pump according to claim 1, characterized in that the input shaft or the joint shaft, or both, are extended or retracted by changing the connection position.
At least a portion of the first shaft and the second shaft is formed of a flexible material. The connecting ends of the first shaft and the second shaft form a first shaft side connecting portion and a second shaft side connecting portion, The single-screw eccentric pump according to claim 9 or 10, characterized in that the first shaft-side connection portion and the second shaft-side connection portion are connected via the adjustment member.
The outer shaft has an outer shaft side threaded portion formed on its outer circumference. The inner shaft has an inner shaft side threaded portion formed on the outer circumference of the exposed portion that is not inserted into the hollow hole, with threads cut in the opposite direction to those of the outer shaft side threaded portion. The adjustment member has a first threaded portion and a second threaded portion whose screwing directions are opposite to each other. The first threaded portion and the outer shaft-side threaded portion, and the second threaded portion and the inner shaft-side threaded portion are screwed together. The single-screw eccentric pump according to claim 2, characterized in that the relative positions of the inner shaft and the outer shaft are changed by moving the screwing positions of the first screw portion and the second screw portion along the axial direction.
The aforementioned telescopic mechanism is A drive unit housed within the hollow hole, which moves the inner shaft relative to the outer shaft, A generator housed within the aforementioned hollow cavity, which generates electricity as the outer shaft rotates, A control unit, which is housed within the aforementioned hollow hole and performs drive control of the drive unit, A battery housed within the hollow cavity, which supplies power to at least the drive unit and the control unit, and stores the power generated by the generator, Equipped with, The single-screw eccentric pump according to claim 2, characterized in that the relative positions of the inner shaft and the outer shaft in the axial direction are changed by the drive of the drive unit.
The aforementioned adjustment member is A screw shaft that is rotationally driven by the aforementioned drive unit, A nut member that is screwed onto the screw shaft and is movable along the axial direction of the screw shaft by rotating the screw shaft, Equipped with, The single-screw eccentric pump according to claim 13, characterized in that the nut member is attached to the inner shaft so as not to rotate relative to it, and is movable integrally with the inner shaft.
The aforementioned telescopic mechanism is A screw shaft that is driven to rotate by power, A nut member that is screwed onto the screw shaft and is movable along the axial direction of the screw shaft by rotating the screw shaft, A link shaft provided in a direction intersecting the aforementioned screw shaft, A rotation direction conversion unit that converts the rotation direction of the link shaft to the rotation direction of the screw shaft, An opening is provided in the outer shaft, allowing the link shaft to be rotated from the outside of the outer shaft, Equipped with, The nut member is attached to the inner shaft so as not to rotate relative to it, and is movable integrally with the inner shaft. The single-axis eccentric screw pump according to claim 2, characterized in that the screw shaft is rotated by rotating the link shaft through the opening, thereby changing the relative positions of the inner shaft and the outer shaft in the axial direction.
The aforementioned adjustment member is The cylinder that constitutes the outer shaft, The inner shaft comprises a piston that is movable in and out of the hollow hole provided in the cylinder, Equipped with, A single-screw eccentric pump according to claim 2, characterized in that relative movement in the axial direction of the cylinder and the piston can be performed by drawing in or discharging liquid or gas into a cylinder chamber formed by the cylinder and the piston.
The aforementioned telescopic mechanism has an adjustment member at the joint portion, The aforementioned adjustment member is An outer member connected to either the rotor side or the input shaft side, formed along the axial direction of the input shaft, An inner member connected to either the rotor side or the input shaft side, and movable relative to the outer member in the axial direction, Equipped with, The single-screw eccentric pump according to claim 1, characterized by changing the relative positions of the outer member and the inner member.
The aforementioned telescopic mechanism has an adjustment member at the joint portion, The aforementioned adjustment member is A plurality of first engaging members having different lengths in the axial direction, A second engaging member that slidably engages with one of the first engaging members selected from among a plurality of first engaging members, Equipped with, The unscrewed pump according to claim 1, characterized in that at least one selected from a plurality of first engaging members is engaged with the second engaging member, thereby extending or retracting either the input shaft or the joint shaft or both in the axial direction.
The pump casing houses the aforementioned expansion and contraction mechanism, A single-screw eccentric pump according to any one of claims 1 to 3, 7 to 10, or 12 to 18, characterized in that the pump casing has an access area that is accessible to at least a part of the telescopic mechanism.

Description

Single-screw eccentric pump This invention relates to a single-screw eccentric pump. More specifically, it relates to a single-screw eccentric pump that can adjust the overlap or gap between the rotor and stator, for example, in response to volume changes due to temperature changes in the stator, or in response to stator wear. Conventionally, a single-screw eccentric pump is known in which a male-screw rotor is fitted into the inner bore of a female-screw stator, and the rotor rotates to discharge fluid drawn in from the suction port (for example, Patent Document 1). The single-screw eccentric pump described in Patent Document 1 is formed such that the outer diameter of the rotor decreases as it moves from one corresponding end to the other end of the rotor and the inner diameter of the stator's inner bore decreases. It is equipped with a moving mechanism for moving the stator relative to the rotor in the direction of the central axis of the stator's inner bore. Furthermore, the moving mechanism constituting the single-screw eccentric pump described in Patent Document 1 comprises a movable casing on which the stator is housed, a fixed casing on which the rotor is housed, and a threaded portion connecting the movable casing and the fixed casing. By rotating the movable casing in the direction of the threaded portion, the stator is moved relative to the rotor in the direction of the central axis of the inner bore. Thus, the invention described in Patent Document 1 adjusts the overlap or gap (sometimes simply referred to as overlap, etc.) between the rotor and the stator. (a) is a front cross-sectional view showing the state of a single-screw eccentric pump according to one embodiment of the present invention before adjustment of the tightening allowance, etc., and (b) is a front cross-sectional view showing the state of the single-screw eccentric pump in (a) after adjustment of the tightening allowance, etc.(a) is a front cross-sectional view showing the state of a single-screw eccentric pump according to the first modified example of the present invention before adjustment of the tightening allowance, etc., and (b) is a front cross-sectional view showing the state of the single-screw eccentric pump in (a) after adjustment of the tightening allowance, etc.(a) is an explanatory diagram of a clamp member (adjustment member) in a single-screw eccentric pump according to a second modified example of the present invention, and (b) is an explanatory diagram of a clamp member according to another embodiment of (a).This is a front cross-sectional view of a single-screw eccentric pump according to a third modified example of the present invention.(a) to (c) are explanatory diagrams of adjustment members of different lengths in a single-screw eccentric pump according to a third modified example of the present invention, and (d) is a front view of the adjustment member of (c) in a removed state.(a) to (c) are explanatory diagrams illustrating the case in which the connection position of the adjustment member is changed in a single-screw eccentric pump according to the fourth modification of the present invention.This is a front view of the expansion/contraction mechanism (flexible material) in a single-screw eccentric pump, with a part of the fourth modified example shown in Figure 6.(a) is an explanatory diagram showing the extended state of the telescopic mechanism (adjustment member) in a single-screw pump according to the fifth modified example of the present invention, and (b) is an explanatory diagram showing the retracted state of the telescopic mechanism in (a).This is a front cross-sectional view of the extension mechanism in a single-screw eccentric pump according to the sixth modified example of the present invention.This is a front cross-sectional view of the extension mechanism in a single-screw eccentric pump according to seventh modifications of the present invention.This is a front cross-sectional view of the extension mechanism in a single-screw eccentric pump according to the eighth modification of the present invention.(a) is an explanatory diagram showing the retracted state of the telescopic mechanism (adjustment member) in a single-screw eccentric pump according to the ninth modified example of the present invention, and (b) is an explanatory diagram showing the extended state of the telescopic mechanism in (a).This is an explanatory diagram showing another embodiment of the telescopic mechanism shown in Figure 12.(a) is an explanatory diagram showing the retracted state of the telescopic mechanism (adjustment member) in a single-screw pump according to the tenth modified example of the present invention, and (b) is an explanatory diagram showing the extended state of the telescopic mechanism in (a). The following describes in detail a single-screw eccentric pump 1 according to one embodiment of the present invention, with reference to the drawings. Note that the figures are schematic representatio