JP2022167539A - Uniaxial eccentric screw pump - Google Patents

Abstract

To provide a uniaxial eccentric screw pump capable of making a device configuration compact.SOLUTION: A uniaxial eccentric screw pump 100 is a uniaxial eccentric screw pump in which a male screw type rotor 20 is inserted to a stator 30 including a female screw type insertion hole. The uniaxial eccentric screw pump 100 comprises a rotor drive mechanism 50 by which a rotor 20 can be revolved while rotating. The rotor drive mechanism 50 includes an input-side pinion gear 52 and a rotation-side crown gear 54. The input-side pinion gear 52 inputs a motive force. The rotation-side crown gear 54 is eccentrically rotatable so as to revolve the rotor 20 while receiving transfer of a rotation motive force with which the rotor 20 rotates, around a fixed central axis C2 in a state where the rotation-side crown gear is connected with the input-side pinion gear 52.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a uniaxial eccentric screw pump provided with a rotor drive mechanism capable of rotating and revolving a rotor.

Conventionally, there has been proposed a uniaxial eccentric screw pump provided with a rotor driving mechanism capable of rotating and revolving a rotor (for example, see Patent Documents 1 and 2).

Patent Literature 1 described above describes a uniaxial eccentric screw pump provided with a rotor driving mechanism capable of rotating and revolving the rotor. The rotor drive mechanism disclosed in Patent Document 1 includes a rotating power transmission member capable of rotating about a certain central axis, and an orbit forming member capable of allowing the base shaft portion of the rotor to rotate and revolve. and a power transmission member (Oldham joint) capable of transmitting the rotation of the rotating power transmission member to the base shaft portion while allowing the revolution (eccentric rotation) of the base shaft portion of the rotor to rotate.

In the power transmission member (Oldham's joint) disclosed in Patent Document 1, grooves perpendicular to each other are provided in the disk provided at the end of the rotation power transmission member and the base shaft, and protrusions perpendicular to each other are formed on the front and back. The rotation power transmission member and the base shaft are connected by interposing a disc-shaped intermediate disc. This absorbs the eccentricity between the rotation axis and the revolution axis of the rotor.

Further, in the uniaxial eccentric screw pump disclosed in Patent Document 2, a rotor constituting a pump mechanism is connected to a power source via a coupling rod. This allows the rotor to revolve (eccentrically rotate) while rotating.

Japanese Patent No. 6188015 JP 2012-154215 A

Here, in the uniaxial eccentric screw pump disclosed in Patent Document 1, the rotating power transmission member and the base shaft are connected by the power transmission member in order to transmit the power of the rotating power transmission member to the base shaft of the rotor. . Further, in the uniaxial eccentric screw pump disclosed in Patent Document 2, it is necessary to provide a long rod such as a coupling rod.

For the reasons described above, the eccentric single screw pumps disclosed in Patent Documents 1 and 2 have a problem that the total length is long and the size is increased. In addition, there is a problem that a large amount of the fluid remains in the pump casing when the pumping of the fluid is stopped.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems, and to provide a uniaxial eccentric screw pump that can be made compact in construction.

In order to achieve the above objects, the present invention is configured as follows.

(1) A uniaxial eccentric screw pump according to the present invention is a uniaxial eccentric screw pump in which a male threaded rotor is inserted into a stator provided with a female threaded insertion hole, and the rotor can be rotated and revolved. The rotor drive mechanism includes a rotation input section for inputting power, and transmission of rotation power for rotating the rotor about a fixed central axis while being connected to the rotation input section. and an eccentric rotating part capable of eccentrically rotating the rotor so as to revolve while receiving.

According to the above configuration, in order to absorb the amount of eccentricity between the rotation axis and the orbital axis of the rotor and transmit the power of the rotation power transmission member to the base shaft portion of the rotor, the rotation power transmission member and the rotor base shaft It is necessary to provide a power transmission member (Oldham joint) that connects the parts and a long rod such as a coupling rod that was used to connect the rotor to the power source so that it can revolve while rotating. Therefore, the overall length can be shortened accordingly. Therefore, according to the above configuration, it is possible to provide a uniaxial eccentric screw pump having a short overall length and a compact configuration. In addition, when the uniaxial eccentric screw pump is stopped, the amount of fluid remaining inside the pump casing can be minimized.

(2) In the uniaxial eccentric screw pump according to the present invention, preferably, the rotor has a male screw portion inserted through an insertion hole of the stator, and a shaft-like base shaft portion connected to the eccentric rotating portion. and the male screw portion and the base shaft portion are preferably integrally coupled along the axis. With this configuration, it is possible to omit (jointless) a connecting member for connecting the male screw portion of the rotor and the base shaft portion. Thereby, the number of parts can be reduced.

(3) In the uniaxial eccentric screw pump according to the present invention, preferably, the rotary input section has an input section side connection section, the eccentric rotary section has an eccentric rotary section side connection section, The input section side connection section and the eccentric rotation section side connection section may be connected so as to be capable of transmitting power while relatively moving in a direction intersecting the central axis. With this configuration, power is transmitted from the rotation input portion to the eccentric rotation portion even when the input portion side connection portion and the eccentric rotation portion side connection portion move relative to each other in accordance with the revolution of the rotor at the connection portion. Therefore, the rotor can revolve while rotating along with the eccentric rotation of the eccentric rotating portion.

(4) In the uniaxial eccentric screw pump according to the present invention, it is preferable that the rotation input part and the eccentric rotation part are arranged so that their axes intersect, and the rotation input part An input side gear portion is formed around an axis, and the eccentric rotating portion meshes with the input side gear portion and rotates the input side gear in a direction intersecting the central axis. It is preferable that an eccentric rotating part side gear part is formed to allow sliding of the part. With this configuration, even when the input portion side gear portion and the eccentric rotation portion side gear portion slide along the revolution of the rotor at the meshing portion, power is transmitted from the rotation input portion to the eccentric rotation portion. As the eccentrically rotating portion rotates eccentrically, the rotor can revolve while rotating.

(5) In the uniaxial eccentric screw pump according to the present invention, preferably, the rotation input part and the eccentric rotation part are arranged so that their respective axes intersect, and the rotation input part It has an input side power transmission surface formed around an axis, and the eccentric rotating part is in contact with the input side power transmission surface so as to enable power transmission by friction, and moves toward the center. It is preferable to have an eccentric rotating part side power transmission surface that allows the input part side power transmission surface to slide in a direction intersecting the shaft. With this configuration, power is transmitted from the rotation input portion to the eccentric rotation portion even when the input portion side power transmission surface and the eccentric rotation portion side power transmission surface slide along the revolution of the rotor at the contact portion. Therefore, the rotor can revolve while rotating along with the eccentric rotation of the eccentric rotating portion.

(6) In the uniaxial eccentric screw pump according to the present invention, preferably, the rotation input part and the eccentric rotation part are arranged so that their axes are parallel to each other, and the rotation input part An input-side gear portion is formed along the circumferential direction, and the eccentric-rotation-part-side gear portion transmits power by meshing with the input-side gear portion along the circumferential direction at the edge of the eccentric-rotation-part-side A gear portion is formed, the rotation input portion is configured to rotate eccentrically with respect to a rotation axis of the rotation input portion, and the eccentric rotation portion synchronizes with the eccentric rotation of the rotation input portion. preferably configured to rotate eccentrically. According to this structure, the gear part on the input part side and the gear part on the eccentric rotation part side rotate eccentrically while they are always in mesh with each other. Thereby, the rotor can be caused to revolve while being rotated by the eccentric rotating portion.

(7) In the uniaxial eccentric screw pump according to the present invention, preferably, the rotor driving mechanism is connected to the rotation input section, and eccentrically rotates the eccentric rotating section while receiving transmission of revolution power for revolving the rotor. It is preferable to further have a revolution power transmission section. With this configuration, by transmitting the power of the rotation input portion to both the eccentric rotation portion and the revolution power transmission portion, the rotor can be caused to revolve by the revolution power transmission member while the rotor is rotated by the eccentric rotation portion. can. Such a forced rotation-revolution system stabilizes the rotational posture of the rotor, and stabilizes the discharge amount without pulsation.

(8) In this case, preferably, the rotation input section is connected to the eccentric rotation section and the revolution power transmission section so as to branch a power transmission system. According to this structure, the eccentric rotating part and the revolution power transmission part can be operated by one power source (rotational input part). As a result, power sources for operating the eccentric rotating portion and the orbital power transmission portion can be reduced. As a result, the device configuration can be simplified.

(9) In the configuration in which the rotor drive mechanism includes an eccentric rotation portion and a revolution power transmission portion, preferably the rotation input portion has an input portion side connection portion, and the eccentric rotation portion is an eccentric rotation portion. The revolution power transmission part has a revolution power transmission part side connection part, and the input part side connection part and the eccentric rotation part side connection part are arranged with respect to the central axis. It is preferable that the input section side connection section and the revolution power transmission section side connection section are connected so as to be capable of transmitting power. With this configuration, even when the input portion side connection portion and the eccentric rotation portion side connection portion move relative to each other in accordance with the revolution of the rotor at the connection portion, the transition from the input portion side connection portion to the eccentric rotation portion side connection portion will occur. Since the power is transmitted, the rotor can be rotated and revolved along with the eccentric rotation of the eccentric rotating portion. In addition, since power is transmitted from the input section side connection section to the revolution power transmission section side connection section, the rotor can be caused to revolve as the revolution power transmission section rotates.

(10) In the configuration in which the rotor drive mechanism includes an eccentric rotating portion and an orbital power transmission portion, preferably, the rotation input portion and the eccentric rotating portion are arranged such that their axes intersect, The rotation input portion and the revolution power transmission portion are arranged so that their respective axes intersect, and the rotation input portion has an input side gear portion formed around the axis of the rotation shaft. and the eccentric rotating part has an eccentric rotating part-side gear part that meshes with the input part-side gear part and allows the input part-side gear part to slide in a direction that intersects the central axis. It is preferable that the revolution power transmission portion is formed with a revolution power transmission portion side gear portion that meshes with the input portion side gear portion. With this configuration, even when the input side gear portion and the eccentric rotating portion side gear portion slide along the revolution of the rotor at the meshing portion, the power is transferred from the input side gear portion to the eccentric rotating portion side gear portion. Since the power is transmitted, the rotor can be rotated and revolved along with the eccentric rotation of the eccentric rotating portion. Further, since power is transmitted from the input section side gear section to the revolution power transmission section side gear section, the rotor can be caused to revolve as the revolution power transmission section rotates.

(11) In the configuration in which the rotor drive mechanism includes an eccentric rotating portion and an orbital power transmission portion, preferably, the rotation input portion and the eccentric rotating portion are arranged so that their axes intersect, The rotation input portion and the revolution power transmission portion are arranged so that their respective axes intersect, and the rotation input portion has an input portion side power transmission surface formed around the axis of the rotation shaft. The eccentric rotating part contacts the input part side power transmission surface so as to enable power transmission by friction, and transmits the input part side power in a direction intersecting the central axis It has an eccentric rotating part side power transmission surface that allows sliding of the transmission surface, and the revolution power transmission part is a revolution power transmission surface that contacts the input part side power transmission surface so that power can be transmitted by friction. It is good to have a power transmission part side power transmission surface. According to the above configuration, even when the input portion side power transmission surface and the eccentric rotating portion side power transmission surface slide along the revolution of the rotor at the contact portion, the power transmission from the input portion side power transmission surface to the eccentric rotating portion side power transmission surface is detected. Since the power is transmitted to the transmission surface, the rotor can be rotated and revolved along with the eccentric rotation of the eccentric rotating portion. Further, since the power is transmitted from the input portion-side power transmission surface to the revolution power transmission portion-side power transmission surface, the rotor can be caused to revolve as the revolution power transmission portion rotates.

(12) In the configuration in which the rotor drive mechanism includes an eccentric rotation section and a revolution power transmission section, preferably the rotation input section, the eccentric rotation section, and the revolution power transmission section have axes parallel to each other. The rotation input portion has an input portion side gear portion formed along the circumferential direction at the edge portion, and the eccentric rotation portion has the input portion side gear portion formed at the edge portion along the circumferential direction. An eccentric rotating part side gear part that transmits power by meshing with the part side gear part is formed, and the rotation input part is configured to rotate eccentrically with respect to the rotation axis of the rotation input part. The eccentric rotation section is configured to rotate eccentrically in synchronization with the eccentric rotation of the rotation input section. A driven pulley is provided as the orbital power transmission part coaxially with the eccentric rotation part, and the rotation input part is provided between the drive pulley and the driven pulley It is preferable that a transmission member for transmitting the power of is laid across. According to this structure, the gear part on the input part side and the gear part on the eccentric rotation part side rotate eccentrically while they are always in mesh with each other. Further, since the drive pulley drives the driven pulley (revolution power transmission section) via the transmission member, the revolution power can be reliably transmitted from the rotation input section to the driven pulley. As a result, the rotor can be caused to revolve by the driven pulley while the rotor is caused to rotate by the eccentric rotating portion.

ADVANTAGE OF THE INVENTION According to the aspect which concerns on this invention, the uniaxial eccentric screw pump which can make an apparatus structure compact can be provided.

(a) is a cross-sectional view showing a uniaxial eccentric screw pump (crown gear type) according to the first embodiment of the present invention, and (b) shows a state in which the base shaft portion of the rotor is inserted into the revolution-side crown gear. It is a schematic diagram. (a) is a diagram showing a rotation power transmission path in a uniaxial eccentric screw pump, and (b) is a diagram showing a revolution power transmission path. (a) is a diagram for explaining the meshing position between the input side pinion gear and the revolution side crown gear, and (b) to (e) are diagrams for explaining the meshing position between the input side pinion gear and the rotation side crown gear. and (f) is a diagram for explaining the outer diameter trajectory of the rotation-side crown gear. [ Fig. 3] Fig. 3 is a cross-sectional view showing a uniaxial eccentric screw pump (traction drive type) according to a second embodiment of the present invention. (a) is a diagram showing a rotation power transmission path in a uniaxial eccentric screw pump, and (b) is a diagram showing a revolution power transmission path. (a) is a diagram for explaining the contact position between the input side roller and the revolution side flange, (b) to (e) are diagrams for explaining the contact position between the input side roller and the rotation side flange, (f) is a diagram for explaining the outer diameter locus of the rotation-side flange. It is sectional drawing which shows the uniaxial eccentric screw pump (eccentric gear + timing pulley type) which concerns on 3rd embodiment of this invention. (a) is a diagram showing a rotation power transmission path in a uniaxial eccentric screw pump, and (b) is a diagram showing a revolution power transmission path. (a) is a diagram for explaining the positional relationship between a rotation input shaft and an eccentric gear (drive gear); is a diagram. It is sectional drawing which shows the uniaxial eccentric screw pump (eccentric gear type) which concerns on the modification of 3rd embodiment of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A uniaxial eccentric screw pump according to an embodiment of the present invention will be described below with reference to the accompanying drawings. These figures are schematic diagrams and are not necessarily drawn to exact proportions. Moreover, in the drawings, the same components are denoted by the same reference numerals.

(First embodiment)
A uniaxial eccentric screw pump 100 in the first embodiment will be described with reference to FIGS. 1 to 3. FIG. The uniaxial eccentric screw pump 100 is a rotary positive displacement pump. As shown in FIG. 1(a), the uniaxial eccentric screw pump 100 has a male-screw rotor 20 that receives power and rotates eccentrically, and a stator 30 that has a female-screw inner peripheral surface. The uniaxial eccentric screw pump 100 is configured such that a pump mechanism 12 , whose main part is composed of a rotor 20 and a stator 30 , is incorporated in a pump casing 14 .

The rotor 20 is a metal shaft having an n-stripe (n=1 in the first embodiment) male screw. Specifically, the rotor 20 has a male screw portion 20a inserted through the insertion hole 34 of the stator 30, and a shaft-like base shaft portion 20b connected to the rotation-side crown gear 54, which will be described later. The male screw portion 20a and the base shaft portion 20b are integrally connected along the axis. In other words, the male screw portion 20a and the base shaft portion 20b are straight rod-shaped members without joints or creases. The male screw portion 20a and the base shaft portion 20b may be integrally molded or machined, or may be connected by screws, welding, or the like.

The rotor 20 is formed to have a substantially perfect circular cross-sectional shape when viewed in cross section at any position in the longitudinal direction. The stator 30 is a member having a substantially cylindrical shape and having an inner peripheral surface 32 formed in a female screw shape with n+1 threads (n=1 in the first embodiment). The insertion hole 34 of the stator 30 is formed so that its cross-sectional shape (opening shape) is substantially oval when viewed in cross-section at any position in the longitudinal direction of the stator 30 .

The rotor 20 is inserted through an insertion hole 34 formed in the stator 30 described above, and is freely eccentrically rotatable inside the insertion hole 34 . A proximal end of the rotor 20 is connected to a motor 80 as a drive source via a rotor drive mechanism 50 which will be described in detail later. The rotor drive mechanism 50 enables the rotor 20 to revolve (eccentrically rotate) while rotating on its own axis by power input from the motor 80 .

When the rotor 20 is inserted into the stator 30, the outer peripheral surface 22 of the rotor 20 and the inner peripheral surface 32 of the stator 30 are brought into close contact at the tangential line therebetween, forming a fluid transport path 40 (cavity). The fluid transport path 40 is formed to spirally extend in the longitudinal direction of the stator 30 and the rotor 20 .

The pump casing 14 is roughly divided into a pump mechanism accommodating portion 14a and a drive mechanism accommodating portion 14b. The pump mechanism housing portion 14 a houses the pump mechanism 12 , which is a tubular body having a cylindrical external shape and whose main portion is constituted by a rotor 20 and a stator 30 . Further, the rotor drive mechanism 50 described above is accommodated in the drive mechanism accommodation portion 14b.

The rotor drive mechanism 50 is a drive mechanism that enables the rotor 20 to revolve while rotating. The rotor drive mechanism 50 has an input-side pinion gear 52 , a rotation-side crown gear 54 , and a revolution-side crown gear 56 . The input-side pinion gear 52 is an example of the "rotational input portion" of the present invention. The rotation-side crown gear 54 is an example of the "eccentric rotating part" of the present invention. The revolution-side crown gear 56 is an example of the "revolution power transmission section" of the present invention.

The input-side pinion gear 52 inputs power transmitted from the motor 80 to the rotation-side crown gear 54 and the revolution-side crown gear 56, which will be described later. The rotation shaft 52a of the input-side pinion gear 52 is accommodated in the drive mechanism accommodation portion 14b via a bearing 58 so as to be rotatable along the axis (central axis C3) of the rotation shaft 52a.

The input-side pinion gear 52 has an input-side gear portion 52b formed around the axis of the rotating shaft 52a. The input section side gear section 52b is an example of the "input section side connection section" in the present invention. The input-side gear portion 52b meshes with a gear portion 54c of the rotation-side crown gear 54 and a gear portion 56c of the revolution-side crown gear 56, which will be described later. The input-side pinion gear 52 is meshed (connected) to the rotation-side crown gear 54 and the revolution-side crown gear 56 so as to branch the power transmission system. In other words, as the motor 80 is driven, power is distributed and transmitted in parallel to the rotation-side crown gear 54 and the revolution-side crown gear 56 .

The rotation-side crown gear 54 revolves around the rotor 20 while being connected to the input-side pinion gear 52 in the drive mechanism accommodating portion 14b while receiving transmission of rotation power that causes the rotor 20 to rotate about a certain central axis C2. It is a member that can be eccentrically rotated so as to allow it to rotate. The rotation-side crown gear 54 is connected to the base shaft portion 20b of the rotor 20 so that power can be transmitted. Therefore, the rotation of the rotation-side crown gear 54 allows the rotor 20 to rotate. Further, the rotation-side crown gear 54 and the rotation axis (central axis C2) of the rotor 20 are coaxial.

The rotation-side crown gear 54 has a base portion 54a, a shaft portion 54b, and a gear portion 54c. The gear portion 54c is an example of the “eccentric rotating portion side connecting portion” and the “eccentric rotating portion side gear portion” of the present invention. The base portion 54a is formed in a circular shape when viewed from the axial direction. A shaft portion 54b is provided in the central portion of the base portion 54a. The shaft portion 54b is provided so as to protrude from the base portion 54a toward the rotor 20 side. An insertion hole 54d into which the base shaft portion 20b of the rotor 20 is inserted and supported is formed in the base portion 54a. Further, the rotation-side crown gear 54 and the input-side pinion gear 52 are arranged so that their axes intersect or are perpendicular to each other.

A gear portion 54c is provided along the circumferential direction on an edge portion 54e of the base portion 54a. The gear portion 54c meshes with the input-side gear portion 52b of the input-side pinion gear 52 and allows sliding relative to the input-side gear portion 52b in a direction intersecting the central axis C2. In other words, when the rotor 20 is revolved by the revolution-side crown gear 56, the rotation-side crown gear 54 revolves with the revolution of the rotor 20, and the gear portion 54c of the rotation-side crown gear 54 becomes the input portion of the input-side pinion gear 52. The rotation-side crown gear 54 rotates eccentrically while its teeth slide with respect to the side gear portion 52b.

The gear portion 54c of the rotation-side crown gear 54 and the gear portion 56c of the revolution-side crown gear 56 have the same number of teeth. Further, the gear portion 54c and the gear portion 56c rotate in opposite directions at the same rotational speed. As a result, rotation and revolution are synchronously rotated.

The revolution-side crown gear 56 is a member that allows the rotation-side crown gear 54 to rotate eccentrically while receiving transmission of revolution power that causes the rotor 20 to revolve. That is, the revolution-side crown gear 56 is a member that allows the revolution (eccentric rotation) of the base shaft portion 20b (rotor 20) while transmitting the rotation of the rotation-side crown gear 54 to the base shaft portion 20b to rotate. is. Also, the revolution-side crown gear 56 is a member that continues to rotate at a fixed position. Further, the revolution-side crown gear 56 and the revolution axis (central axis C1) of the rotor 20 are coaxial.

The revolution-side crown gear 56 permits the rotation of the base shaft portion 20b of the rotor 20 (see arrow A in FIG. 1B), while causing the base shaft portion 20b to revolve on a predetermined revolution track (arrow B in FIG. 1B). (see reference). Specifically, as shown in FIG. 1, the revolution-side crown gear 56 is a member rotatably supported by bearings 57 in the pump mechanism housing portion 14a and the drive mechanism housing portion 14b.

The revolution-side crown gear 56 has a base portion 56a, a shaft portion 56b, and a gear portion 56c. The gear portion 56c is an example of the “revolutionary power transmission portion side connection portion” and the “revolutionary power transmission portion side gear portion” of the present invention. The base portion 56a is formed in a circular shape when viewed from the axial direction. A shaft portion 56b is provided in the central portion of the base portion 56a. The shaft portion 56b is provided so as to protrude from the base portion 56a toward the rotor 20 side. An insertion hole 56d for inserting and supporting the base shaft portion 20b of the rotor 20 is formed in the central portion of the base portion 56a.

An edge portion 56e of the base portion 56a is provided with a gear portion 56c along the circumferential direction. The gear portion 56c meshes with the input side gear portion 52b of the input side pinion gear 52, and is connected so as to be able to transmit power from the input side pinion gear 52. As shown in FIG.

The revolution-side crown gear 56 can rotatably (rotate) support the base shaft portion 20b via a bearing 59 in the insertion hole 56d. That is, the base shaft portion 20b is rotatably supported at a position offset from the center (center axis C1) of the insertion hole 56d by the amount of eccentricity e (see FIGS. 3B to 3E). Therefore, the base shaft portion 20b inserted through the insertion hole 56d can freely rotate.

Further, as shown in FIG. 1(b), the insertion hole 56d is a round hole provided at a position away from the axial center position of the revolution-side crown gear 56. As shown in FIG. As a result, as shown in FIG. 1B, the base shaft portion 20b is rotatable around a central axis C2 deviated from the central axis C1. Further, as indicated by arrow B in FIG. 1(b), by rotating the revolution-side crown gear 56, the base shaft portion 20b inserted through the insertion hole 56d revolves as indicated by arrow A in FIG. 1(b). (eccentric rotation). Therefore, the base shaft portion 20b can revolve around the central axis C1 while rotating around the central axis C2.

Further, unlike the rotation-side crown gear 54, the revolution-side crown gear 56 rotates around the central axis C1 without eccentrically rotating. sliding).

Further, the revolution-side crown gear 56 and the input-side pinion gear 52 are arranged such that their respective axes intersect or are perpendicular to each other. Further, the revolution-side crown gear 56 and the rotation-side crown gear 54 are arranged such that their axes are parallel to each other.

Next, operation of the uniaxial eccentric screw pump 100 will be described. By rotating the rotor 20 in the insertion hole 34 of the stator 30 , the uniaxial eccentric screw pump 100 can advance the fluid transport path 40 in the stator 30 in the longitudinal direction. Therefore, by rotating the rotor 20 , it is possible to suck the viscous liquid from one end side of the stator 30 into the fluid transfer path 40 and transfer it toward the other end side of the stator 30 . Further, by switching the rotation direction of the rotor 20, the traveling direction of the fluid transport path 40 can be switched.

Here, as shown in FIG. 2( a ), in the uniaxial eccentric screw pump 100 , the rotor drive mechanism 50 performs a characteristic operation by operating the motor 80 . Specifically, as shown in the shaded area (rotational power transmission path) in FIG. It rotates around C2. Accordingly, the base shaft portion 20b (rotor 20) connected to the rotation-side crown gear 54 rotates about the central axis C2.

On the other hand, as shown in the shaded area (revolution power transmission path) in FIG. 2B, power transmitted from the input pinion gear 52 to the revolution crown gear 56 causes the revolution crown gear 56 to rotate about the central axis C1. rotate. Accordingly, the base shaft portion 20b (rotor 20) inserted through the insertion hole 56d located away from the central axis C1 revolves (rotates eccentrically) with respect to the central axis C1. Therefore, the base shaft portion 20b (rotor 20) rotates by the power transmitted from the rotation-side crown gear 54 side and revolves by the power transmitted from the revolution-side crown gear 56 side. By operating the rotor 20 in the insertion hole 34 of the stator 30 in this way, the fluid transport path 40 advances in the longitudinal direction in the stator 30, and the fluid can be pumped.

Further, as shown in FIG. 3( a ), the meshing position between the input side gear portion 52 b of the input side pinion gear 52 and the gear portion 56 c is , always keep the same positional relationship.

Further, as shown in FIGS. 3B to 3E, the engagement position between the input side gear portion 52b of the input side pinion gear 52 and the gear portion 54c of the rotation side crown gear 54 is It differs depending on the position of the central axis C2 (the center of the rotation axis). For example, as shown in FIG. 3B, when the rotation angle of the rotation-side crown gear 54 is 0°, the rotation-side crown A central axis C2 (the center of the rotation axis) of the gear 54 is located on the lower side.

Further, as shown in FIG. 3C, when the rotation angle of the rotation-side crown gear 54 is 90°, the rotation-side crown A central axis C2 (the center of the rotation axis) of the gear 54 is located on the left side.

Further, as shown in FIG. 3D, when the rotation angle of the rotation-side crown gear 54 is 180°, the rotation-side crown A central axis C2 (the center of the rotation axis) of the gear 54 is located on the upper side.

Further, as shown in FIG. 3(e), when the rotation angle of the rotation-side crown gear 54 is 270°, the rotation-side crown A central axis C2 (the center of the rotation axis) of the gear 54 is located on the right side.

As described above, the outer diameter locus L of the rotation-side crown gear 54 when the rotation-side crown gear 54 rotates eccentrically as shown in FIGS. It is larger than the outer diameter D1 of the rotation-side crown gear 54 and the outer diameter D2 of the revolution-side crown gear 56 . Further, regardless of the rotation position (rotation angle) of the rotation-side crown gear 54, the gear portion 54c of the rotation-side crown gear 54 and the input-side gear portion 52b of the input-side pinion gear 52 are in a state of meshing. , power is always transmitted.

According to the first embodiment described above, the following effects (1) to (5) can be obtained.

(1) In the uniaxial eccentric screw pump 100 according to the first embodiment, the rotor driving mechanism 50 includes the input side pinion gear 52 for inputting power, and the rotor driving mechanism 50 rotating around a certain central axis while being connected to the input side pinion gear 52. and a rotation-side crown gear 54 capable of eccentrically rotating so as to cause the rotor 20 to revolve while receiving transmission of rotation power for rotating the rotor 20 . As a result, in order to transmit power on the rotation side to the base shaft portion 20b of the rotor 20, a power transmission member (Oldham joint) that connects the rotation power transmission member and the base shaft portion 20b of the rotor 20, and a It is no longer necessary to provide a long rod such as a coupling rod used for connecting to the power source so that it can revolve. Therefore, the total length can be shortened accordingly. As a result, it is possible to provide the uniaxial eccentric screw pump 100 having a short overall length and a compact configuration. In addition, when the single shaft eccentric screw pump 100 is stopped, the amount of fluid remaining inside the pump casing can be minimized.

(2) In the uniaxial eccentric screw pump 100 according to the first embodiment, the rotation-side crown gear 54 is eccentrically rotated while the orbital-side crown gear 56 receives the transmission of orbital power for revolving the rotor 20 from the input-side pinion gear 52. made it As a result, the power of the input-side pinion gear 52 is transmitted to both the rotation-side crown gear 54 and the revolution-side crown gear 56 , so that the rotation-side crown gear 54 rotates the rotor 20 while the revolution-side crown gear 56 rotates the rotor 20 . can be revolved. According to such a forced rotation/revolution system, the rotor 20 is supported by both the rotation and revolution mechanisms, and the rotational posture is maintained. As a result, when the discharge pressure is high, the rotor 20 is tilted by the pressure and pressed against the stator 30, and the stator 30 is elastically deformed to change the shape of the cavity related to the discharge amount. can be suppressed to stabilize the ejection amount. In addition, since the rotor 20 can revolve without a reaction force from the stator 30, the rotor 20 is thinned to make the rotor 20 and the stator 30 non-contact when feeding slurry containing highly abrasive particles. is also possible.

(3) In the uniaxial eccentric screw pump 100 according to the first embodiment, the gear portion 54c of the rotation-side crown gear 54 is moved in a direction intersecting the central axis C1 (C2) while meshing with the input-side gear portion 52b. , the input side gear portion 52b is allowed to slide. Further, the gear portion 56c of the revolution-side crown gear 56 is meshed with the input-side gear portion 52b. As a result, even when the input side gear portion 52b and the gear portion 54c slide at the meshing portion, power is transmitted from the input side gear portion 52b to the gear portion 54c, so that the rotation side crown gear 54 is eccentric. The rotor can be rotated as it rotates. Further, since power is transmitted from the input side gear portion 52b to the gear portion 56c, the rotor 20 can be caused to revolve as the revolution side crown gear 56 rotates.

(4) In the uniaxial eccentric screw pump 100 according to the first embodiment, the male screw portion 20a and the base shaft portion 20b of the rotor 20 are integrally coupled along the axis. As a result, a connecting member for connecting the male screw portion 20a of the rotor 20 and the base shaft portion 20b can be omitted (jointless). Thereby, the number of parts can be reduced.

(5) In the uniaxial eccentric screw pump 100 according to the first embodiment, the power transmission system for the rotation-side crown gear 54 and the revolution-side crown gear 56 in the input-side pinion gear 52 is connected so as to branch. Thereby, the rotation-side crown gear 54 and the revolution-side crown gear 56 can be operated by one power source (the input-side pinion gear 52). As a result, power sources for operating the rotation-side crown gear 54 and the revolution-side crown gear 56 can be reduced. As a result, the device configuration can be simplified.

(Second embodiment)
Next, a uniaxial eccentric screw pump 200 according to a second embodiment of the present invention will be described with reference to FIGS. 4 to 6. FIG. In the second embodiment, unlike the first embodiment described above, an example using a mechanism that transmits rotation by rolling contact of the input side roller will be described.

The rotor drive mechanism 50 in the second embodiment, which is a drive mechanism that enables the rotor 20 to revolve while rotating, has an input-side roller 521 , a rotation-side flange 541 , and a revolution-side flange 561 . Note that the input-side roller 521 is an example of the "rotational input section" of the present invention. The rotation-side flange 541 is an example of the "eccentric rotating part" of the present invention. The revolution-side flange 561 is an example of the "revolution power transmission section" of the present invention.

The input side roller 521 has an input side power transmission surface 521c formed around the axis of the rotating shaft 521a. The input section side power transmission surface 521c is an example of the "input section side connection section" in the present invention. The input portion side power transmission surface 521c (the tip portion of the rotating shaft 521a) is formed in a cylindrical shape with a slightly bulging central portion. The input portion-side power transmission surface 521 c is in contact with the rotation-side power transmission surface 541 f of the rotation-side flange 541 and the revolution-side power transmission surface 561 f of the revolution-side flange 561 . The rotation-side power transmission surface 541f is an example of the "eccentric rotation part-side power transmission surface" and the "eccentric rotation part-side connection part" of the present invention. The revolution-side power transmission surface 561f is an example of the "revolution power transmission unit-side power transmission surface" and the "revolution power transmission unit-side connecting portion" of the present invention.

The input-side roller 521 is in contact with the rotation-side flange 541 and the revolution-side flange 561 so as to branch the power transmission system. That is, as the motor 80 is driven, power is distributed and transmitted in parallel to the rotation-side flange 541 and the revolution-side flange 561 . Specifically, the input-side power transmission surface 521c is strongly pressed against the rotation-side power transmission surface 541f and the revolution-side power transmission surface 561f via a lubricating oil film. The rotation-side flange 541 and the revolution-side flange 561 also rotate.

The rotation-side flange 541 revolves the rotor 20 while being connected to the input-side roller 521 in the drive mechanism accommodating portion 14b and receiving transmission of rotation power that causes the rotor 20 to rotate about a certain central axis C2. It is a member that can rotate eccentrically. The rotation-side flange 541 is connected to the base shaft portion 20b of the rotor 20 so that power can be transmitted. Therefore, the rotation of the rotation-side flange 541 allows the rotor 20 to rotate. Further, the rotation-side flange 541 and the rotation axis (central axis C2) of the rotor 20 are coaxial.

The rotation-side flange 541 has a base portion 541a, a shaft portion 541b, and a rotation-side power transmission surface 541f. The base portion 541a is formed in a circular shape when viewed from the axial direction. A shaft portion 541b is provided in the central portion of the base portion 541a. The shaft portion 541b is provided so as to protrude from the base portion 541a toward the rotor 20 side. An insertion hole 541d for inserting and supporting the base shaft portion 20b of the rotor 20 is formed in the central portion of the base portion 541a. Further, the rotation-side flange 541 and the input-side roller 521 are arranged such that their axes intersect or are perpendicular to each other.

An edge portion 541e of the base portion 541a is provided with a rotation-side power transmission surface 541f along the circumferential direction. The rotation-side power transmission surface 541f is in contact with the input-side power transmission surface 521c so as to enable power transmission by friction, and moves against the input-side power transmission surface 521c in the direction intersecting the central axis C2. Allow sliding. In other words, when the rotor 20 revolves by the revolution-side flange 561, the revolution-side flange 541 revolves with the revolution of the rotor 20, and the revolution-side power transmission surface 541f of the revolution-side flange 541 becomes the input portion of the input-side roller 521. The rotation-side flange 541 rotates eccentrically while the transmission surface slides on the side power transmission surface 521c.

The rotation-side power transmission surface 541f (rotation-side flange 541) and the revolution-side power transmission surface 561f (revolution-side flange 561) rotate in directions opposite to each other. The rotation speed difference is absorbed by a slight slip, and the rotation becomes the same speed. As a result, the rotation and the revolution are synchronously rotated.

The revolution-side flange 561 is a member that allows the rotation-side flange 541 to rotate eccentrically while receiving transmission of revolution power that causes the rotor 20 to revolve. That is, the revolution-side flange 561 is a member that allows the revolution (eccentric rotation) of the base shaft portion 20b (rotor 20) and allows the rotation of the rotation-side flange 541 to be transmitted to the base shaft portion 20b to rotate. . Also, the revolution-side flange 561 is a member that continues to rotate at a fixed position. The revolution-side flange 561 and the revolution axis (central axis C1) of the rotor 20 are coaxial.

The revolution-side flange 561 allows the base shaft portion 20b of the rotor 20 to rotate on its axis (see arrow A in FIG. 1B), while allowing the base shaft portion 20b to revolve on a predetermined revolution track (see arrow B in FIG. 1B). ). Specifically, as shown in FIG. 1, the revolution-side flange 561 is a member rotatably supported by bearings 57 in the pump mechanism housing portion 14a and the driving mechanism housing portion 14b.

The revolution-side flange 561 has a base portion 561a, a shaft portion 561b, and a revolution-side power transmission surface 561f. The base portion 561a is formed in a circular shape when viewed from the axial direction. A shaft portion 561b is provided in the central portion of the base portion 561a. The shaft portion 561b is provided so as to protrude from the base portion 561a toward the rotor 20 side. An insertion hole 561d for inserting and supporting the base shaft portion 20b of the rotor 20 is formed in the central portion of the base portion 561a.

An edge portion 561e of the base portion 561a is provided with a revolution-side power transmission surface 561f along the circumferential direction. The revolution-side power transmission surface 561f is in contact with the input-side power transmission surface 521c of the input-side roller 521, and is connected so as to be able to transmit power from the input-side roller 521. As shown in FIG.

The revolution-side flange 561 can rotatably (rotate) support the base shaft portion 20b via the bearing 59 in the insertion hole 561d. That is, the base shaft portion 20b is rotatably supported at a position offset from the center (center axis C1) of the insertion hole 561d by the amount of eccentricity e (see FIGS. 6B to 6E). Therefore, the base shaft portion 20b inserted through the insertion hole 561d can freely rotate.

Also, the insertion hole 561d is a round hole provided at a position away from the axial center position of the revolution-side flange 561 . As a result, the base shaft portion 20b is rotatable around a central axis C2 that is deviated from the central axis C1. Further, by rotating the revolution-side flange 561, the base shaft portion 20b inserted through the insertion hole 561d can be guided to revolve (rotate eccentrically). Therefore, the base shaft portion 20b can revolve around the central axis C1 while rotating around the central axis C2.

Further, unlike the rotation-side flange 541, the revolution-side flange 561 rotates around the central axis C1 without eccentrically rotating. Do not move (sliding).

Further, the revolution-side flange 561 and the input-side roller 521 are arranged such that their respective axes intersect or are perpendicular to each other. Further, the revolution-side flange 561 and the rotation-side flange 541 are arranged such that their respective axes are parallel.

Next, operation of the uniaxial eccentric screw pump 200 will be described. The uniaxial eccentric screw pump 200 can advance the fluid transport path 40 in the stator 30 in the longitudinal direction by rotating the rotor 20 in the insertion hole 34 of the stator 30 . Therefore, by rotating the rotor 20 , it is possible to suck the viscous liquid from one end side of the stator 30 into the fluid transfer path 40 and transfer it toward the other end side of the stator 30 . Further, by switching the rotation direction of the rotor 20, the traveling direction of the fluid transport path 40 can be switched.

Here, as shown in FIG. 5( a ), in the uniaxial eccentric screw pump 200 , the rotor drive mechanism 50 performs a characteristic operation by operating the motor 80 . Specifically, as shown in the shaded area (rotation power transmission path) in FIG. 5A, when the motor 80 is operated, the power transmitted from the input side roller 521 causes the rotation side flange 541 to move toward the center axis C2. rotate around . Accordingly, the base shaft portion 20b (rotor 20) connected to the rotation-side flange 541 rotates around the central axis C2.

On the other hand, as shown in the shaded area (revolution power transmission path) in FIG. 5B, the power transmitted from the input side roller 521 to the revolution side flange 561 causes the revolution side flange 561 to rotate about the central axis C1. . Accordingly, the base shaft portion 20b (rotor 20) inserted through the insertion hole 561d located away from the central axis C1 revolves (rotates eccentrically) with respect to the central axis C1. Therefore, the base shaft portion 20b (rotor 20) rotates by the power transmitted from the rotation-side flange 541 side and revolves by the power transmitted from the revolution-side flange 561 side. By operating the rotor 20 in the insertion hole 34 of the stator 30 in this way, the fluid transport path 40 advances in the longitudinal direction in the stator 30, and the fluid can be pumped.

Further, as shown in FIG. 6A, the contact position between the input side power transmission surface 521c of the input side roller 521 and the revolution side power transmission surface 561f is the rotational position (rotational angle) of the revolution side flange 561. It always maintains the same positional relationship.

Further, as shown in FIGS. 6B to 6E, the contact position between the input side power transmission surface 521c of the input side roller 521 and the rotation side power transmission surface 541f of the rotation side flange 541 is As you can see, it differs depending on the position of the central axis C2 (the center of the rotation axis) in the rotation-side flange 541 . For example, as shown in FIG. 6B, when the rotation angle of the rotation-side flange 541 is 0°, the rotation-side flange 541 has The central axis C2 (the center of the rotation axis) is located on the lower side.

Further, as shown in FIG. 6(c), when the rotation angle of the rotation-side flange 541 is 90°, the rotation-side flange 541 has The central axis C2 (rotational axis center) is located on the left side.

Further, as shown in FIG. 6D, when the rotation angle of the rotation-side flange 541 is 180°, the rotation-side flange 541 has The central axis C2 (the center of the rotation axis) is located on the upper side.

Further, as shown in FIG. 6(e), when the rotation angle of the rotation-side flange 541 is 270°, the rotation-side flange 541 has The central axis C2 (rotational axis center) is located on the right side.

As described above, the outer diameter locus L of the rotation-side flange 541 when the rotation-side flange 541 rotates eccentrically as shown in FIGS. It is larger than the outer diameter D1 of the flange 541 and the outer diameter D2 of the revolution-side flange 561 . Furthermore, regardless of the rotation position (rotation angle) of the rotation-side flange 541, the rotation-side power transmission surface 541f of the rotation-side flange 541 and the input-side power transmission surface 521c of the input-side roller 521 are in contact with each other. and power is always transmitted.

Other configurations of the second embodiment are the same as those described in the first embodiment.

According to the second embodiment described above, in addition to the effects (1), (2), (4), and (5) of the first embodiment, the following effect (6) can be obtained.

(6) In the uniaxial eccentric screw pump 200 according to the second embodiment, the rotation-side power transmission surface 541f of the rotation-side flange 541 contacts the input-side power transmission surface 521c so that power can be transmitted by friction. In addition, sliding on the input portion side power transmission surface 521c in the direction intersecting the central axis C1 (C2) is allowed. A revolution-side power transmission surface 561f of the revolution-side flange 561 is brought into contact with the input portion-side power transmission surface 521c so that power can be transmitted by friction. As a result, even when the input portion side power transmission surface 521c and the rotation side power transmission surface 541f slide at the contact portion, power is transmitted from the input portion side power transmission surface 521c to the rotation side power transmission surface 541f. , the rotor 20 can be rotated along with the eccentric rotation of the rotation-side flange 541 . Further, since power is transmitted from the input portion-side power transmission surface 521c to the revolution-side power transmission surface 561f, the rotor 20 can be caused to revolve as the revolution-side flange 561 rotates.

(Third embodiment)
Next, a uniaxial eccentric screw pump 300 according to a third embodiment of the present invention will be described with reference to FIGS. 7 to 9. FIG. In the third embodiment, unlike the first and second embodiments described above, an eccentric gear is used as a rotation input portion and a timing pulley is used as a revolution power transmission portion.

The rotor drive mechanism 60 in the third embodiment is a drive mechanism that enables the rotor 20 to revolve while rotating. The rotor drive mechanism 60 has an eccentric gear 62 , a driven gear 64 , a driven pulley 66 , a driven pulley support portion 68 , a rotary input shaft 70 , a drive pulley 72 and a timing belt 74 .

The driven gear 64 is an example of the "eccentric rotating part" of the present invention. The driven pulley 66 and the driven pulley support portion 68 are examples of the "revolution power transmission portion" of the present invention. The rotation input shaft 70 and the eccentric gear 62 are examples of the "rotational input section" of the present invention. The timing belt 74 is an example of the "transmission member" of the present invention. The eccentric gear 62, driven gear 64, driven pulley 66, driven pulley support portion 68, rotary input shaft 70, and drive pulley 72 are arranged such that their axes are parallel to each other.

The eccentric gear 62 has an eccentric gear portion 62a along the circumferential direction at the edge. The eccentric gear portion 62a is an example of the "input portion side connection portion" and the "input portion side gear portion" of the present invention. The eccentric gear portion 62a meshes with a driven gear portion 64a of a driven gear 64, which will be described later. The eccentric gear 62 is formed with an insertion hole 62b through which the rotation input shaft 70 is inserted. The insertion hole 62b is formed at a position shifted from the central axis C4 of the eccentric gear 62. As shown in FIG. In other words, as shown in FIG. 9(a), the rotation input shaft 70 and the central axis of the eccentric gear 62 are arranged at positions eccentrically offset by the amount of eccentricity e. Accordingly, when the rotation input shaft 70 is rotated by the power of the motor 80, the eccentric gear 62 rotates eccentrically with respect to the central axis C4.

The driven gear 64 revolves the rotor 20 while being connected to the eccentric gear 62 in the drive mechanism accommodating portion 14b while receiving transmission of rotation power that causes the rotor 20 to rotate about a certain central axis C2. It is an eccentrically rotatable member. The driven gear 64 is connected to the base shaft portion 20b of the rotor 20 so as to be able to transmit power. Therefore, the rotation of the driven gear 64 allows the rotor 20 to rotate. The driven gear 64 rotates eccentrically due to the revolution of the rotor 20, and the eccentric gear 62 also rotates eccentrically. In addition, the driven gear 64 and the rotation axis (central axis C2) of the rotor 20 are coaxial.

The driven gear 64 has a perfect circular shape when viewed from the axial direction. The driven gear 64 has a driven gear portion 64a along the circumferential direction at the edge. The driven gear portion 64a is an example of the "eccentric rotating portion side connecting portion" and the "eccentric rotating portion side gear portion" of the present invention. At the center of the driven gear 64, an insertion hole 64b is formed into which the base shaft portion 20b of the rotor 20 is inserted and supported.

Power is transmitted to the driven gear portion 64a by meshing with the eccentric gear portion 62a. As a result, the driven gear 64 rotates in the opposite direction to the eccentric gear 62, causing the base shaft portion 20b to rotate. Also, the driven gear 64 and the eccentric gear 62 have the same number of teeth.

The driving pulley 72 is provided coaxially with the eccentric gear 62 (rotational input shaft 70). The drive pulley 72 is rotationally driven with the rotation of the eccentric gear 62 (rotational input shaft 70). The drive pulley 72 has a circular shape when viewed from the axial direction. A circular insertion hole 72 a through which the rotary input shaft 70 is inserted is formed in the central portion of the drive pulley 72 . A toothed portion 72b is formed on the edge of the driving pulley 72 along the circumferential direction so that one end of the timing belt 74 is stretched over the toothed portion 72b.

The driven pulley 66 is provided coaxially with the driven gear 64 . The driven pulley 66 has a circular shape when viewed from the axial direction. The edge of the driven pulley 66 is formed with a toothed portion 66b over which the other end of the timing belt 74 is stretched along the circumferential direction. The driven pulley 66 and the drive pulley 72 have the same number of teeth. The driven pulley 66 is rotationally driven (eccentrically rotated) in the same direction as the rotational direction of the eccentric gear 62 as the timing belt 74 is rotated by the rotation of the driving pulley 72 . At the center of the driven pulley 66, a circular insertion hole 66a is formed through which the end portion 68a of the driven pulley support portion 68 is inserted.

An insertion hole 68b into which the base shaft portion 20b of the rotor 20 is inserted and supported is formed at a position apart from the axial position of the driven pulley support portion 68. As shown in FIG. Thus, the driven pulley support portion 68 can rotatably support the base shaft portion 20b via the bearing 59 in the insertion hole 68b. That is, the base shaft portion 20b is rotatably supported at a position offset from the center (center axis C1) of the insertion hole 68b by the amount of eccentricity e (see FIG. 9A). Therefore, the base shaft portion 20b inserted through the insertion hole 68b can freely rotate. The central axis C1, which is the axis of revolution of the base shaft portion 20b, and the axis of the driven pulley 66 are coaxial.

A common cog belt, V-belt, or the like is used for the timing belt 74 . Also, when applying to a large pump, a chain or the like is used instead of the belt. Also, as another example, a magnetic coupling is also applicable.

Next, operation of the uniaxial eccentric screw pump 300 will be described. Basic operations are the same as those of the first and second embodiments. Here, as shown in FIG. 8( a ), in the uniaxial eccentric screw pump 300 , the rotor drive mechanism 60 performs a characteristic operation by operating the motor 80 . Specifically, as shown in the shaded area (rotational power transmission path) in FIG. The driven gear 64 rotates (eccentrically rotates) about the central axis C1 while it rotates (eccentrically rotates) about the center. Accordingly, the base shaft portion 20b (rotor 20) connected to the driven gear 64 rotates around the central axis C2.

On the other hand, as shown in the shaded area (orbital power transmission path) in FIG. rotates around the central axis C1. Accordingly, the base shaft portion 20b (rotor 20) inserted through the insertion hole 68b located away from the central axis C1 revolves (rotates eccentrically) with respect to the central axis C1. Therefore, the base shaft portion 20b (rotor 20) rotates by the power transmitted from the driven gear 64 side and revolves by the power transmitted from the driven pulley 66 side. By operating the rotor 20 in the insertion hole 34 of the stator 30 in this way, the fluid transport path 40 advances in the longitudinal direction in the stator 30, and the fluid can be pumped.

Further, as shown in FIG. 9(a), the central axis C5 of the rotation input shaft 70 and the central axis C4 of the eccentric gear 62 are arranged at positions eccentrically offset by the amount of eccentricity e.

Further, as shown in FIGS. 9B to 9D, the revolution axis (central axis C1) of the base shaft portion 20b of the rotor 20 is driven by a timing belt 74, and the drive pulley 72 and the driven pulley 66 have the same number of teeth. Therefore, it rotates by the same angles (0°, 45°, 90°) as the rotation input shaft 70 . When the revolution shaft rotates, the rotation shaft (central axis C2) moves in the same direction and by the same angle as the rotation input shaft 70, but the positional relationship between the eccentric gear 62 and the driven gear 64 does not change. Further, the rotation shaft is driven by the eccentric gear 62 and the driven gear 64, and since both gears have the same number of teeth, it rotates by the same angle as the rotation input shaft 70. As a result, rotation and revolution are synchronously rotated.

According to the third embodiment described above, in addition to the effects (1), (2), (4), and (5) of the first and second embodiments, the following effect (7) can be obtained. can be done.

(7) In the uniaxial eccentric screw pump 300 according to the third embodiment, the drive pulley 72 that rotates with the rotation of the eccentric gear 62 is provided coaxially with the eccentric gear 62, and the driven pulley 72 is provided coaxially with the driven gear 64. 66 is provided so that a timing belt 74 is stretched between the drive pulley 72 and the driven pulley 66 . As a result, the eccentric gear portion 62a and the driven gear portion 64a rotate eccentrically while they are always in mesh with each other. In addition, since the drive pulley 72 drives the driven pulley 66 via the timing belt 74 , revolution power can be reliably transmitted to the driven pulley 66 . As a result, the rotor 20 can be caused to revolve by the driven pulley 66 while the rotor 20 is caused to rotate by the driven gear 64 .

(Modified example of the third embodiment)
Next, a uniaxial eccentric screw pump 301 in a modified example of the third embodiment of the present invention will be described with reference to FIG. 10 . In the modified example of the third embodiment, unlike the third embodiment described above, an example in which the forced revolution mechanism (drive pulley, driven pulley, and timing belt) on the revolution side is omitted will be described.

As shown in FIG. 10 , in a uniaxial eccentric screw pump 301 according to the modification of the third embodiment, a rotor drive mechanism 601 has an eccentric gear 62 , a driven gear 64 and a rotary input shaft 70 . That is, unlike the third embodiment described above, the drive pulley, driven pulley, and timing belt are omitted.

With the configuration as described above, in the uniaxial eccentric screw pump 301, when the motor 80 is operated, the power transmitted from the rotation input shaft 70 causes the eccentric gear 62 to rotate (eccentrically rotate) around the central axis C5. , the driven gear 64 rotates (eccentrically rotates) around the central axis C1. Accordingly, the base shaft portion 20b (rotor 20) connected to the driven gear 64 rotates around the central axis C2. Further, the driven gear 64 (eccentric rotation portion on the rotation side) can be eccentrically rotated by the rotation force and the reaction force of the stator 30 .

As described above, in the uniaxial eccentric screw pump 301 according to the modified example of the third embodiment, the driven gear 64 (eccentric rotating part on the rotation side) can be used even if the forced revolution mechanism on the rotation side is removed and only the power transmission on the rotation side is used. is capable of eccentric rotation. It is suitable for applications where the discharge pressure is low and contact between the rotor 20 and the stator 30 is acceptable, and the overall size of the pump can be further reduced.

(Other modifications)
The above embodiment can also be modified as follows.

In the first to third embodiments described above, examples were shown in which the rotor drive mechanism includes the rotation input section, the eccentric rotation section, and the revolution power transmission section, but the present invention is not limited to this. In the present invention, as shown in the modified example of the third embodiment, it is also possible to adopt a configuration in which the revolution power transmission section is omitted. In this case, the eccentric rotation part on the rotation side can be eccentrically rotated by the rotation force and the reaction force of the stator.

In the above-described first and second embodiments, the crown gear and the transmission surface are shown as an example of the connection portion between the rotation input portion, the eccentric rotation portion, and the orbital power transmission portion, but the present invention is not limited to this. In the present invention, a mechanism other than the above may be applied as long as power can be transmitted while relatively moving between the rotation input portion and the eccentric rotation portion.

In the first to third embodiments described above, an example is shown in which one rotation input portion is branched to the eccentric rotation portion and the orbital power transmission portion, but the present invention is not limited to this. In the present invention, it is also possible to provide one rotation input section for each of the eccentric rotation section and the orbital power transmission section.

All of the above embodiments are examples of adaptations of the present invention, and any other embodiments within the scope of the claims are of course included in the technical scope of the invention.

100, 200, 300, 301: Uniaxial eccentric screw pump 20: Rotor 20a: Male threaded portion 20b: Base shaft portion 30: Stator 50, 60, 601: Rotor drive mechanism 52: Input side pinion gear (rotational input portion)
52b: Input part side gear part (input part side connection part)
521c: Input part side power transmission surface (input part side connection part)
521: Input side roller (rotational input part)
54: Rotation side crown gear (eccentric rotation part)
541: Rotation side flange (eccentric rotation part)
54c: gear part (eccentric rotation part side connection part, eccentric rotation part side gear part)
541f: rotation side power transmission surface (eccentric rotation part side power transmission surface, eccentric rotation part side connection part)
56: Revolution-side crown gear (revolution power transmission unit)
561: Revolution side flange (revolution power transmission part)
56c: gear part (revolution power transmission part side connection part, revolution power transmission part side gear part)
561f: revolution-side power transmission surface (revolution power transmission unit-side power transmission surface, revolution power transmission unit-side connection portion)
62: Eccentric gear (rotational input part)
62a: Eccentric gear part (input part side connection part, input part side gear part)
64: driven gear (eccentric rotating part)
64a: Driven gear part (eccentric rotation part side connection part, eccentric rotation part side gear part)
66: driven pulley (orbital power transmission part)
68: Driven pulley support part (orbital power transmission part)
70: Rotation input shaft (rotation input part)
72: Drive pulley 74: Timing belt (transmission member)
C1, C2, C3, C4, C5: central axis

Claims (12)

A uniaxial eccentric screw pump in which a male threaded rotor is inserted into a stator provided with a female threaded insertion hole,
A rotor drive mechanism capable of rotating and revolving the rotor is provided,
The rotor drive mechanism is
a rotation input unit for inputting power;
an eccentric rotating part capable of eccentrically rotating the rotor while being connected to the rotation input part and receiving rotation power that causes the rotor to rotate about a certain central axis. Uniaxial eccentric screw pump characterized by: The rotor has a male screw portion inserted through an insertion hole of the stator, and a shaft-like base shaft portion connected to the eccentric rotating portion,
2. The uniaxial eccentric screw pump according to claim 1, wherein the male screw portion and the base shaft portion are integrally coupled along the axis. The rotation input section has an input section side connection section,
The eccentric rotating part has an eccentric rotating part side connection part,
2. The input section side connection section and the eccentric rotation section side connection section are connected so as to be capable of transmitting power while relatively moving in a direction intersecting the central axis. 3. The uniaxial eccentric screw pump according to 2. The rotation input part and the eccentric rotation part are arranged so that their axes intersect,
The rotation input part has an input part side gear part formed around the axis of the rotation shaft,
The eccentric rotating part is formed with an eccentric rotating part-side gear part that meshes with the input part-side gear part and allows the input part-side gear part to slide in a direction intersecting the central axis. The uniaxial eccentric screw pump according to any one of claims 1 to 3, characterized in that it is a The rotation input part and the eccentric rotation part are arranged so that their axes intersect,
The rotation input portion has an input portion side power transmission surface formed around the axis of the rotating shaft,
The eccentric rotating portion slides the input portion side power transmission surface in a direction intersecting the central axis while contacting the input portion side power transmission surface so as to enable power transmission by friction. 4. The uniaxial eccentric screw pump according to any one of claims 1 to 3, characterized in that it has an eccentric rotating part side power transmission surface that allows the . The rotation input portion and the eccentric rotation portion are arranged such that their respective axes are parallel to each other,
The rotation input part has an input part side gear part formed along the circumferential direction at the edge part,
The eccentric rotating part is formed with an eccentric rotating part side gear part that transmits power by meshing with the input part side gear part along the circumferential direction at the edge,
The rotation input section is configured to rotate eccentrically with respect to a rotation axis of the rotation input section,
3. The uniaxial eccentric screw pump according to claim 1, wherein the eccentric rotation part is configured to rotate eccentrically in synchronization with the eccentric rotation of the rotation input part. The rotor drive mechanism is
3. A revolution power transmission part connected to said rotation input part, further comprising a revolution power transmission part for eccentrically rotating said eccentric rotating part while receiving transmission of revolution power for revolving said rotor. A uniaxial eccentric screw pump according to . 8. The uniaxial eccentric screw pump according to claim 7, wherein the rotation input section is connected to the eccentric rotation section and the orbital power transmission section so as to branch a power transmission system. The rotation input section has an input section side connection section,
The eccentric rotating part has an eccentric rotating part side connection part,
The revolution power transmission part has a revolution power transmission part side connection part,
The input section side connection section and the eccentric rotation section side connection section are connected so as to be capable of transmitting power while relatively moving in a direction intersecting the central axis,
The uniaxial eccentric screw pump according to claim 7 or 8, wherein the input portion side connection portion and the revolution power transmission portion side connection portion are connected so as to be able to transmit power. The rotation input part and the eccentric rotation part are arranged so that their axes intersect,
The rotation input portion and the revolution power transmission portion are arranged so that their axes intersect,
The rotation input part has an input part side gear part formed around the axis of the rotation shaft,
The eccentric rotating part is formed with an eccentric rotating part-side gear part that meshes with the input part-side gear part and allows the input part-side gear part to slide in a direction intersecting the central axis. is a
10. The single shaft according to any one of claims 7 to 9, wherein the revolution power transmission portion is formed with a revolution power transmission portion side gear portion that meshes with the input portion side gear portion. Eccentric screw pump. The rotation input part and the eccentric rotation part are arranged so that their axes intersect,
The rotation input portion and the revolution power transmission portion are arranged so that their axes intersect,
The rotation input portion has an input portion side power transmission surface formed around the axis of the rotating shaft,
The eccentric rotating portion slides the input portion side power transmission surface in a direction intersecting the central axis while contacting the input portion side power transmission surface so as to enable power transmission by friction. It has an eccentric rotating part side power transmission surface that allows
8. The revolution power transmission portion has a revolution power transmission portion side power transmission surface that contacts the input portion side power transmission surface so as to enable power transmission by friction. 10. The uniaxial eccentric screw pump according to any one of -9. The rotation input section, the eccentric rotation section, and the revolution power transmission section are arranged so that their respective axes are parallel to each other,
The rotation input part has an input part side gear part formed along the circumferential direction at the edge part,
The eccentric rotating part is formed with an eccentric rotating part side gear part that transmits power by meshing with the input part side gear part along the circumferential direction at the edge,
The rotation input section is configured to rotate eccentrically with respect to a rotation axis of the rotation input section,
The eccentric rotation section is configured to rotate eccentrically in synchronization with the eccentric rotation of the rotation input section,
A drive pulley is provided coaxially with the rotation input section and is rotationally driven in accordance with the rotation of the rotation input section,
A driven pulley as the revolution power transmission unit is provided coaxially with the eccentric rotation unit,
9. The uniaxial eccentric screw pump according to claim 7, wherein a transmission member for transmitting power of said rotation input portion is bridged between said driving pulley and said driven pulley.

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