Stator handling device, and uniaxial eccentric screw pump system

Abstract

To provide a stator handling device having an effect of reducing labor necessary for assembly and disassembly of a stator, and a uniaxial eccentric screw pump system.SOLUTION: A stator handling device 10 includes: an operation portion 20 capable of rotating operation; a power transmission member 32 provided with a plurality of teeth 32a; and an engagement portion 34 engageable with and removable from the teeth 32a. The operation portion 20 is connected to the power transmission member 32, and the engagement portion 34 is disposed for a stator 120. In response to a rotating operation of the operation portion 20 with the engagement portion 34 being engaged with the teeth 32a disposed on the power transmission member 32, the plurality of teeth 32a are sequentially engaged with and removed from the engagement portion 34 and a position of engagement between the engagement portion 34 and the teeth varies in an extension direction, thus causing the stator 120 to move in an axial direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a stator handling device used for performing at least one of an assembly operation and a removal operation of a stator in a single-shaft eccentric screw pump, and to a single-shaft eccentric screw pump system including the stator handling device. [Background technology]

[0002] Conventionally, there has been provided a single-shaft eccentric screw pump as disclosed in the following Patent Document 1. The single-shaft eccentric screw pump in Patent Document 1 transports an object by eccentrically rotating a male-screw rotor, which is connected to a drive shaft of a drive device provided at one end of a pump casing via a flexible shaft, rotatably inserted into a female-screw stator. In the single-shaft eccentric screw pump in Patent Document 1, the flexible shaft is made of engineering plastic. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3629100 Summary of the Invention [Problem to be solved by the invention]

[0004] In the uniaxial eccentric screw pump disclosed in the above Patent Document 1, when assembling the stator, it is necessary to insert the male-threaded rotor, which is installed beforehand, into the female-threaded hole of the stator and move the stator in the axial direction while rotating it. Also, when removing the stator, it is necessary to move the stator in the axial direction while rotating it in the opposite direction to the assembling direction.

[0005] In the single-shaft eccentric screw pump, the rotor and the stator are in close contact with each other with a predetermined tightening margin. Therefore, in order to assemble or remove the stator in the single-shaft eccentric screw pump, a relatively large force is required to rotate and move the stator, and a considerable force is required especially in the case of a large stator. Therefore, there has been a demand for a stator handling device that can reduce the labor required for the assembly and removal of the stator compared to the conventional technology.

[0006] Therefore, the present invention aims to provide a stator handling device that has the effect of reducing the labor required for at least one of the stator assembly and removal operations in a single-shaft eccentric screw pump, and a single-shaft eccentric screw pump system equipped with the stator handling device. [Means for solving the problem]

[0007] (1) A stator handling device of the present invention is for performing at least one of an assembly operation and a removal operation of a stator in a single-shaft eccentric screw pump by moving the stator in the axial direction, and is characterized in that it comprises an operating unit that can be rotated around a fixed fulcrum, a power transmission member that is arranged to extend along the axial direction of the stator and has a plurality of teeth provided in an extension direction along the axial direction, and an engaging unit that can engage with and disengage from the plurality of teeth of the power transmission member, wherein the operating unit is connected to one of the power transmission member and the stator, and the engaging unit is provided to the other of the power transmission member and the stator, and when the engaging unit is engaged with some of the plurality of teeth provided on the power transmission member, the plurality of teeth engage with and disengage from the engaging unit in sequence in response to a rotating operation of the operating unit, and an engagement position between the engaging unit and the teeth changes in the extension direction, thereby moving the stator in the axial direction.

[0008] The stator handling device of the present invention is configured as described above in (1), so that a large force generated by the principle of leverage in response to the rotation of the operating unit is transmitted to the stator via the power transmission member and the engaging unit. As a result, the stator handling device of the present invention can smoothly move the stator in the axial direction. In addition, in the stator handling device of the present invention, the multiple teeth are engaged with and disengaged from the engaging unit in sequence in response to the rotation of the operating unit, and the engagement position between the engaging unit and the teeth varies in the extension direction. Therefore, the stator handling device of the present invention can continue to move the stator in the axial direction by repeating the rotation of the operating unit. Therefore, the stator handling device of the present invention can reduce the labor required for at least one of the assembling and disassembling of the stator in a single-shaft eccentric screw pump.

[0009] (2) In the stator handling device of the present invention, the power transmission member is connected to the operating unit, the engagement portion is fixed to the stator, and in response to rotating the operating unit, the power transmission member moves in the extension direction and the multiple teeth engage and disengage with the engagement portion in sequence, so that the engagement position between the engagement portion and the teeth changes in the extension direction.

[0010] The stator handling device of the present invention, configured as described above in (2), can move the stator in the axial direction by utilizing a force applied to the operating part via the power transmission member connected to the operating part and the engagement part fixed to the stator. Therefore, by utilizing the stator handling device of the present invention in at least one of the assembling and disassembling operations of the stator, the labor required for the operations can be reduced.

[0011] (3) In the stator handling device of the present invention, the uniaxial eccentric screw pump is provided with a drive source and a casing attached between the stator and the drive source, and the fulcrum is preferably provided on the casing or an adapter attached to the casing.

[0012] It is assumed that the stator handling device of the present invention will act on the fulcrum of the operation unit by applying a force to the stator. Based on this assumption, it is preferable that the stator handling device of the present invention has the configuration as described above in (3). By configuring the stator handling device of the present invention in this way, it is possible to firmly fix the operation unit at the fulcrum by utilizing the casing or an adapter attached to the casing, without separately providing a robust fixing member or the like for supporting the fulcrum.

[0013] (4) The stator handling device of the present invention may further include a guide member extending along the axial direction of the stator, the guide member supporting the stator so as to be movable in the axial direction.

[0014] The stator handling device of the present invention, having the configuration as described above in (4), can support the stator, which is a heavy object, so as to move smoothly along the axial direction.

[0015] (5) In the stator handling device of the present invention, it is preferable that the stator is supported by the guide member at a support position that is a middle portion of the stator in the axial direction and is defined based on the position of the center of gravity of the stator.

[0016] By being configured as described above in (5), the stator handling device of the present invention can support the stator movably in the axial direction while preventing the stator from tilting up and down.

[0017] (6) In the stator handling device of the present invention, it is preferable that the engagement portion is fixed to the stator so as to protrude in a direction intersecting the axial direction at a position offset in the axial direction of the stator from the support position.

[0018] In the stator handling device of the present invention, by providing the engaging portion at a position axially away from the support position as described above in (6), it is not necessary to extend the power transmission member, etc. As a result, the stator handling device of the present invention can minimize the size and weight of the parts, reduce manufacturing costs, and improve handleability.

[0019] (7) In the stator handling device of the present invention, a protrusion protruding in a direction intersecting the axial direction is provided on the stator at the support position, and the protrusion is arranged to contact the guide member, so that the stator is supported by the guide member while its rotation around the axis is restricted.

[0020] By being configured as described above in (7), the stator handling device of the present invention can support the stator so that it can move in the axial direction while preventing the stator from tilting vertically and preventing the stator from rotating around the axis.

[0021] (8) In the stator handling device of the present invention, it is preferable that the engagement portion is provided at the support position and supports the stator.

[0022] As described above in (8), the stator handling device of the present invention is configured so that the stator can be supported by the engagement portion, thereby simplifying the device configuration.

[0023] (9) In the stator handling device of the present invention, the uniaxial eccentric screw pump is provided with an end stud attached to one end side of the stator, and the end stud is fixed to a base supporting the uniaxial eccentric screw pump by a fixing device, and it is preferable that the fixing device can be used to fix the guide member to the base during assembly and removal of the stator.

[0024] The stator handling device of the present invention, configured as described above in (9), can utilize the fasteners for fastening the end studs when fastening the guide member to the base, thereby simplifying the device configuration of the stator handling device of the present invention.

[0025] (10) In the stator handling device of the present invention, it is preferable that the guide member has an assembly side end region at an end in an assembly direction of the stator, and when the stator is assembled, the load received by the guide member in the assembly side end region due to supporting the stator is smaller than the load received by the guide member at a portion outside the assembly side end region.

[0026] By configuring the stator handling device of the present invention as described above in (10), it becomes easier to remove the guide member after the stator assembly work is completed and to install the guide member when the stator is removed.

[0027] (11) In the stator handling device of the present invention, the assembly side end region may be formed so as to taper toward an end in an assembly direction of the stator.

[0028] The stator handling device of the present invention, configured as described above in (11), facilitates removal of the guide member after assembling the stator and installation of the guide member when removing the stator.

[0029] (12) The stator handling device of the present invention may further include a positioning unit capable of positioning the stator in a cross section of the stator.

[0030] The stator handling device of the present invention, configured as described above in (12), makes it easier to position the stator, thereby making it possible to suppress damage, deformation, wear, and the like of the stator and surrounding members that would otherwise be caused by performing the stator assembly or removal work without the stator being properly positioned.

[0031] (13) The stator handling device of the present invention may be such that the operating unit includes a first part connected to the fulcrum and a second part attached directly or indirectly to the first part and capable of being grasped during the rotation operation, and the power transmission member is held by the first part, and the first part is held by the second part.

[0032] The stator handling device of the present invention, as described above in (13), holds the power transmission member with the first component constituting the operation unit, thereby suppressing rattling and falling off of the power transmission member. Also, the stator handling device of the present invention can stably hold the first component during the rotation operation by being configured to hold the first component with the second component that is gripped during the rotation operation, as described above in (13). Therefore, by being configured as described above in (13), the stator handling device of the present invention can increase the operational stability of the power transmission member.

[0033] (14) A single-shaft eccentric screw pump system of the present invention comprises a single-shaft eccentric screw pump and the stator handling device of the present invention described above, wherein the single-shaft eccentric screw pump has a rotor formed by a male-threaded shaft, a stator through which the rotor can be inserted and whose inner surface is formed into a female-threaded shape, and a flexible rod that transmits power output from a drive source to the rotor.

[0034] As described above in (14), the uniaxial eccentric screw pump system of the present invention is a uniaxial eccentric screw pump equipped with a flexible rod. As described above, in the uniaxial eccentric screw pump, the rotor and the stator are in close contact with each other to provide a predetermined tightening margin. Therefore, when the stator is rotated in the installation and removal of the stator as in the conventional technology, the rotation of the stator also acts on the rotor in the rotation direction, and the flexible rod may become twisted. When the flexible rod is twisted, if the force for rotating the stator weakens for some reason, the force stored in the flexible rod may be transmitted to the stator via the rotor, causing the stator to rotate unexpectedly. Therefore, in order to prevent the stator from rotating in this way, it is desirable to be able to perform at least one of the installation and removal of the stator without rotating the stator.

[0035] Based on this knowledge, the uniaxial eccentric screw pump system of the present invention is provided with the above-mentioned stator handling device of the present invention. As described above, the stator handling device of the present invention can perform at least one of assembling and removing the stator by moving the stator in the axial direction without rotating the stator. Therefore, the uniaxial eccentric screw pump system of the present invention can prevent the stator from rotating unexpectedly when performing at least one of assembling and removing the stator in a uniaxial eccentric screw pump equipped with a flexible rod. Effect of the Invention

[0036] According to the present invention, it is possible to provide a stator handling device and a uniaxial eccentric screw pump system that can solve the above-mentioned problems. [Brief description of the drawings]

[0037] [Figure 1] 1 is a front view showing a single-shaft eccentric screw pump system and a stator handling device according to an embodiment of the present invention; [Diagram 2] 2 is a cross-sectional view showing a uniaxial eccentric screw pump provided in the uniaxial eccentric screw pump system of FIG. 1. [Diagram 3] 2 is an enlarged view of a main part of the uniaxial eccentric screw pump system and a stator handling device shown in FIG. 1. [Figure 4] 4A and 4B are a front view and a side view, respectively, showing a first component constituting an operating unit. [Diagram 5] 1A and 1B are a front view and a side view, respectively, showing an operation unit. [Figure 6] 6 is a side view showing a state in which the operation unit shown in FIG. 5 is connected to an adapter and a power transmission member. [Figure 7] 1A and 1B are a front view and a side view, respectively, showing the adapter in an exploded state. [Figure 8] 1A and 1B are a front view and a side view, respectively, showing a power transmission member. [Figure 9] 13 is a front view showing a state in which the base portion is attached to the guide member. FIG. [Figure 10] 1A to 1C are explanatory diagrams illustrating a stator handling device and a step-by-step assembly operation of a stator in a single-shaft eccentric screw pump system. [Figure 11] 1A to 1C are explanatory diagrams illustrating a stator handling device and a step-by-step process of removing a stator from a single-shaft eccentric screw pump system. [Figure 12] 13 is a side view showing a state in which an operating unit and a power transmission member are connected to an adapter according to a modified example. FIG. [Figure 13] 1A is a front view showing the disassembled state of a guide member and a base portion relating to a modified example, FIG. 1B is a side view showing the base portion used in FIG. 1A, and FIG. 1C is a front view showing the assembled state of the guide member and base portion relating to FIG. [Figure 14] 13 is an explanatory diagram relating to a modified example in which the power transmission member is connected to the stator, and the engagement portion is fixed to the operation portion. FIG. [Figure 15]FIG. 1A is a perspective view showing the mounting fixture, FIG. 1B is a side view showing the state in which the stator is disposed on the guide member using the mounting fixture, and FIG. 1C is a perspective view showing the state in which the stator is disposed on the guide member using the mounting fixture. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] Next, a uniaxial eccentric screw pump system S and a stator handling device 10 according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0039] <About the Single-axis Eccentric Screw Pump System S> The uniaxial eccentric screw pump system S includes a stator handling device 10 and a uniaxial eccentric screw pump 110. The uniaxial eccentric screw pump system S uses the stator handling device 10 to move a stator 120 included in the uniaxial eccentric screw pump 110 in the axial direction, thereby enabling the assembly and removal of the stator 120. In the following description, first, the configuration of the uniaxial eccentric screw pump 110 will be described, and then the stator handling device 10 will be described in further detail.

[0040] <About the Single Shaft Eccentric Screw Pump 110> As shown in Fig. 2, the uniaxial eccentric screw pump 110 is a so-called rotary displacement pump, and as shown in Fig. 2, a stator 120, a rotor 130, a power transmission mechanism 150, and the like are housed inside a casing 112. The casing 112 is a metallic cylindrical member, and a first opening 114a is provided in a disk-shaped end stud 112a attached to one end in the longitudinal direction. In addition, a second opening 114b is provided on the outer periphery of the casing 112. The second opening 114b communicates with the internal space of the casing 112 at an intermediate portion 112d located in the longitudinal middle portion of the casing 112.

[0041] The first opening 114a and the second opening 114b are portions that function as a suction port and a discharge port of the uniaxial eccentric screw pump 110, respectively. The uniaxial eccentric screw pump 110 of this embodiment can pump a fluid (fluid) by rotating the rotor 130 in the forward direction so that the first opening 114a functions as a discharge port and the second opening 114b functions as a suction port. The uniaxial eccentric screw pump 110 can pump a fluid by rotating the rotor 130 in the reverse direction so that the first opening 114a functions as a suction port and the second opening 114b functions as a discharge port. Hereinafter, unless otherwise specified, the uniaxial eccentric screw pump 110 will be described as operating so that the first opening 114a functions as a discharge port and the second opening 114b functions as a suction port.

[0042] The stator 120 is a member having a cylindrical external shape. The stator 120 is made of, for example, an elastic body, a resin, a metal, or a ceramic. The material of the stator 120 is appropriately selected according to the type and properties of the transported object (fluid) transported by the uniaxial eccentric screw pump 110. The stator 120 is accommodated inside the stator mounting portion 112b located adjacent to the first opening 114a in the casing 112. The outer diameter of the stator 120 is almost the same as the inner diameter of the stator mounting portion 112b. Therefore, the stator 120 is mounted in a state in which the outer circumferential surface is in close contact with the inner circumferential surface of the stator mounting portion 112b. In addition, the stator 120 is fixed by clamping the flange portion 120a on one end side with the end stud 112a at the end of the casing 112 and attaching and tightening the stay bolt 116 across the end stud 112a and the main body portion of the casing 112. Therefore, the stator 120 does not shift in position within the stator attachment portion 112b of the casing 112. The inner peripheral surface 124 of the stator 120 has an n-thread single-stage or multi-stage female thread shape. In this embodiment, the inner peripheral surface 124 has a two-thread multi-stage shape.

[0043] The rotor 130 is configured by a male-screw type shaft body. The rotor 130 is formed of materials such as metals and ceramics. The material of the rotor 130 is appropriately selected according to the type and properties of the transported object (fluid). The rotor 130 has a single-stage or multi-stage female screw shape with n-1 threads. In this embodiment, the rotor 130 has a single thread and is multi-stage. The rotor 130 is a shaft body (connected shaft) to which a connecting shaft 170, which will be described later in detail, is connected. The rotor 130 is connected to the connecting shaft 170 (connecting shaft) via a rotor-side connecting portion 200. The rotor 130 rotates eccentrically by the power transmitted via the connecting shaft 170. The rotor 130 is formed so that the cross-sectional shape is almost a perfect circle when viewed in cross section at any position in the longitudinal direction. The rotor 130 is inserted into a through hole 122 formed in the stator 120 described above, and is capable of freely eccentrically rotating inside the through hole 122 .

[0044] When the rotor 130 is inserted into the stator 120, the outer peripheral surface 132 of the rotor 130 and the inner peripheral surface 124 of the stator 120 come into contact with each other at their tangent lines (seal lines). As a result, a series of independent sealed spaces called cavities 134 are formed between the inner peripheral surface 124 of the stator 120 forming the through holes 122 and the outer peripheral surface of the rotor 130. The cavities 134 constitute a fluid transport path 140 for transporting a fluid that is not a transport object. The fluid transport path 140 is a multi-stage (d-stage) flow path having a length d times the reference length of the leads in the axial direction of the stator 120 or rotor 130, where the length L of the leads of the stator 120 or rotor 130 described above is taken as a reference length.

[0045] The fluid transport path 140 extends in a spiral shape in the longitudinal direction of the stator 120 and the rotor 130. When the rotor 130 is rotated in the through hole 122 of the stator 120, the fluid transport path 140 advances in the longitudinal direction of the stator 120 while rotating in the stator 120. Therefore, when the rotor 130 is rotated, the fluid is sucked into the fluid transport path 140 from one end side of the stator 120, and the fluid is transported toward the other end side of the stator 120 while being confined in the fluid transport path 140, and can be discharged at the other end side of the stator 120. That is, when the rotor 130 is rotated in the forward direction, the fluid sucked in from the second opening 114b can be pumped and discharged from the first opening 114a. When the rotor 130 is rotated in the reverse direction, the fluid sucked in from the first opening 114a can be discharged from the second opening 114b.

[0046] The power transmission mechanism 150 is provided to transmit power from a driving source 155, such as a driving machine, provided outside the casing 112 to the rotor 130. The power transmission mechanism 150 has a power connection part 152 and an eccentric rotation part 154. The power connection part 152 is provided in a shaft accommodating part 112c provided on one end side in the longitudinal direction of the casing 112, more specifically, on the opposite side to where the end stud 112a and the stator mounting part 112b are provided (hereinafter, also simply referred to as the "base end side"). The eccentric rotation part 154 is provided in an intermediate part 112d formed between the shaft accommodating part 112c and the stator mounting part 112b.

[0047] The power connection part 152 has a drive shaft 156. The drive shaft 156 is rotatably supported by two bearings 156a and 156b. The drive shaft 156 is taken out from a closed portion on the base end side of the casing 112. The drive shaft 156 is connected to a driving source 155. Therefore, the drive shaft 156 can be rotated by operating the driving source 155. In other words, the drive shaft 156 is a shaft body that functions as an output shaft that rotates by receiving the output of the driving source 155.

[0048] A shaft seal member 160 is provided between the shaft accommodating portion 112c, where the power connection portion 152 is provided, and the intermediate portion 112d. The shaft seal member 160 is provided to provide a structure in which the fluid, which is the transported object, does not leak from the intermediate portion 112d side to the shaft accommodating portion 112c side. The shaft seal member 160 can be formed of, for example, a mechanical seal or a gland packing. In this embodiment, a mechanical seal is used as the shaft seal member 160. The shaft seal member 160 is attached to the drive shaft 156 (output shaft).

[0049] The eccentric rotation unit 154 is a part that connects the drive shaft 156 and the rotor 130 so as to be capable of transmitting power. The eccentric rotation unit 154 has a connecting shaft 170. The connecting shaft 170 is configured by a flexible shaft body. In this embodiment, the connecting shaft 170 is configured by a flexible rod. The connecting shaft 170 is connected to the drive shaft 156 via a drive side connecting unit 100 at one end side (base end side) in the longitudinal direction. The connecting shaft 170 is also connected to the rotor 130 via a rotor side connecting unit 200 at the other end side (tip end side) in the longitudinal direction. With these configurations, the eccentric rotation unit 154 can transmit the rotational power transmitted from the drive source 155 via the drive shaft 156 to the rotor 130, and rotate the rotor 130 eccentrically.

[0050] <Regarding the stator handling device 10> Next, the stator handling device 10 will be described. As described above, the stator handling device 10 is a device for performing an assembly operation and a removal operation of the stator 120 by moving the stator 120 in the axial direction in the uniaxial eccentric screw pump 110. As shown in FIG. 1, the stator handling device 10 is roughly equipped with an operation unit 20, a power transmission mechanism unit 30, and a stator guide unit 50.

[0051] The operation unit 20 is provided to be operated by a user when performing the assembling and removing operations of the stator 120. The operation unit 20 can be rotated around a fixed fulcrum 22. The operation unit 20 may be provided on a separately provided fixing member or the like, or on the casing 112 or an adaptor 28 attached to the casing 112. As shown in Figs. 1 and 3, in this embodiment, the operation unit 20 has the fulcrum 22 provided on the adaptor 28 fixed to the casing 112.

[0052] 3, 5, etc., the operation unit 20 has a first part 24 and a second part 26. The operation unit 20 is configured by assembling the first part 24 and the second part 26. The operation unit 20 can be disassembled into the first part 24 and the second part 26 as appropriate.

[0053] The first part 24 is a part that is connected to the fulcrum 22. The first part 24 is also a part that is connected to a power transmission member 32 of the power transmission mechanism 30, which will be described later. The first part 24 can hold the power transmission member 32 in a state that it is connected to the fulcrum 22. As will be described later, the power transmission member 32 is disposed on one side and the other side of the region in which the stator 120 moves (hereinafter also referred to as the "stator movement region T"), so that a pair of first parts 24 are also prepared correspondingly and disposed on one side and the other side via the stator movement region T. In addition, the first part 24 is held by the second part 26. In this embodiment, the second part 26 is connected to the pair of first parts 24, 24 disposed via the stator movement region T, so that the first parts 24, 24 are held by the second part 26.

[0054] 4, the first component 24 is configured of a plate-shaped member. The first component 24 has a shaft connecting portion 24a, a power transmission member connecting portion 24b, and a rotation area defining portion 24c on the base end side (the side connected to the fulcrum 22). The first component 24 also has a second component connecting portion 24d on the tip side (the side connected to the second component 26).

[0055] The shaft connecting portion 24a is a portion to which a shaft 28a, which is provided so as to form a fulcrum 22 in an adapter 28 described below, is connected. The shaft connecting portion 24a is formed by a hole into which the shaft 28a can be inserted.

[0056] The power transmission member connecting portion 24b is a portion that connects the power transmission member 32 to the first component 24 so that the power transmission member 32 can swing (rotate) relative to the first component 24. A shaft that protrudes in a direction intersecting (approximately perpendicular in this embodiment) the plate body that constitutes the first component 24 can be attached to the power transmission member connecting portion 24b.

[0057] The rotation area defining portion 24c is for defining the rotation area of ​​the operating portion 20 about the fulcrum 22 in combination with a rotation restricting protrusion 28b provided on the adapter 28 described later. In a state in which the operating portion 20 is rotatable about the fulcrum 22 at the pivot connecting portion 24a, the rotation area defining portion 24c is provided at positions on one side and the other side in the rotation direction with respect to the pivot connecting portion 24a (fulcrum 22) so as to interfere with the rotation restricting protrusion 28b (see FIG. 3).

[0058] The second component connecting portion 24d is a portion formed to extend toward the tip side of the first component 24. The second component connecting portion 24d is formed to extend linearly on an extension line of the above-mentioned spindle connecting portion 24a and the power transmission member connecting portion 24b. The second component connecting portion 24d is formed with a width that allows it to be inserted into the cylindrical body that constitutes the second component 26. As a result, the first component 24 can be connected to the second component 26 by inserting the second component connecting portion 24d into the second component 26.

[0059] As shown in FIG. 5 and FIG. 6, the second part 26 is a part that is attached directly or indirectly (directly in this embodiment) to the first part 24. As described above, the second part 26 is connected to the pair of first parts 24, 24 to hold them. The second part 26 has a first part connecting part 26a, a connecting part 26b, and a reinforcing part 26c. The second part 26 may be configured such that the first part connecting part 26a, the connecting part 26b, and the reinforcing part 26c are each made of separate members and connected to each other, or may be configured such that some or all of the parts are integrally formed. In this embodiment, the second part 26 is configured such that the first part connecting part 26a and the connecting part 26b are integrally formed using a cylindrical body such as a metal pipe, and the reinforcing part 26c is connected to the first part connecting part 26a and the connecting part 26b.

[0060] The first component connecting portion 26a connects the second component 26 to the first component 24 by combining with the second component connecting portion 24d of the first component 24 described above. The first component connecting portion 26a has a cylindrical shape with an open end. As described above, in this embodiment, a pair of first components 24, 24 are arranged on one side and the other side through the stator moving region T. Therefore, the second component 26 is provided with a pair of first component connecting portions 26a, 26a corresponding to the first components 24, 24. In this embodiment, the pair of first component connecting portions 26a, 26a is formed by bending the cylinder forming the first component connecting portion 26a and the connecting portion 26b into a U-shape.

[0061] The connecting portion 26b is formed to connect the first component connecting portions 26a, 26a. This allows the second component 26 to integrally rotate the first component connecting portions 26a, 26a and the first components 24, 24 (second component connecting portions 24d, 24d) connected thereto. This allows the operating unit 20 to simultaneously operate a pair of power transmission members 32, 32 connected to the first components 24, 24 without timing lag. In addition, the connecting portion 26b can be gripped by the user when rotating the operating unit 20. When a user grips the connecting portion 26b and rotates the operating portion 20, an equal force can be easily transmitted to both of the pair of power transmission members 32, 32 connected to the first components 24, 24.

[0062] The reinforcing portion 26c is provided at a longitudinal intermediate portion of the first component connecting portions 26a, 26a so as to connect the first component connecting portions 26a, 26a to each other. The reinforcing portion 26c is provided substantially parallel to the connecting portion 26b. By providing the reinforcing portion 26c in the second component 26, the second component 26 can be reinforced and the interval between the first component connecting portions 26a, 26a can be prevented from fluctuating.

[0063] 1, 3, etc., the adapter 28 is a member attached to a flange portion provided at an end of the casing 112 constituting the uniaxial eccentric screw pump 110 in order to install the stator handling device 10. As shown in Fig. 6, two adapters 28 are used when installing the stator handling device 10. The adapters 28, 28 are attached to the ends of the casing 112 on one side and the other side, respectively, via the stator movement region T.

[0064] 6 and 7, the adapter 28 includes a support shaft 28a and a rotation restricting protrusion 28b used in relation to the operation unit 20 connected to the casing 112 of the above-mentioned uniaxial eccentric screw pump 110. The adapter 28 also includes a guide member connecting portion 28c used in relation to the stator guide portion 50. The adapter 28 is further provided with a positioning portion 28d used in relation to the stator 120 and constituting the stator guide portion 50.

[0065] The support shaft 28a is a shaft-shaped member provided at a position that becomes the fulcrum 22 when the adapter 28 is attached to the casing 112. The support shaft 28a is provided so as to protrude toward the outside of the stator movement area T when the adapter 28 is attached to the casing 112.

[0066] The rotation restricting protrusion 28b is a shaft-shaped member provided at a position below the spindle 28a in a state in which the adapter 28 is attached to the casing 112. In a state in which the spindle 28a is inserted into the spindle connecting portion 24a of the first part 24 constituting the operating unit 20, the rotation restricting protrusion 28b is disposed between the two rotation area defining portions 24c, 24c provided on the first part 24. This allows the operating unit 20 (first part 24) to rotate about the fulcrum 22 (spindle 28a) within a range in which the rotation restricting protrusion 28b does not interfere with the rotation area defining portions 24c, 24c.

[0067] The guide member connecting portion 28c is a portion to which the guide member 52 constituting the stator guide portion 50 is connected. The guide member connecting portion 28c may be any portion capable of connecting the guide member 52, but in this embodiment, the guide member connecting portion 28c is configured as a hole (recess) into which the tip portion of the guide member 52 can be inserted.

[0068] The positioning portion 28d positions the stator 120 in a cross section of the stator 120 when the stator 120 is connected and assembled to the casing 112 of the uniaxial eccentric screw pump 110. The positioning portion 28d can position the stator 120 only in either the up-down direction or the left-right direction, but in this embodiment, the positioning portion 28d positions the stator 120 in both the up-down direction and the left-right direction. In this embodiment, the positioning portion 28d is configured by a protruding portion made of a pin or a shaft that protrudes in the axial direction of the casing 112 when the adapter 28 is attached to the end of the casing 112.

[0069] Two positioning portions 28d are provided for one adapter 28. The positioning portions 28d, 28d are provided so as to be in a positional relationship spaced apart in the up-down direction at an interval corresponding to the size of the stator 120 to be attached. Furthermore, in a state in which the two adapters 28, 28 are attached to the casing 112, the two positioning portions 28d, 28d are provided so as to be in a positional relationship spaced apart in the left-right direction (on one side and the other side via the stator movement region T) at an interval corresponding to the size of the stator 120 to be attached.

[0070] The adapter 28 may be formed by integrally forming the above-mentioned support shaft 28a, the rotation restricting protrusion 28b, the guide member connecting portion 28c, and the positioning portion 28d, or may be formed by assembling parts formed separately for some components to parts constituting other portions. In this embodiment, as shown in Fig. 7, the adapter 28 is formed by assembling a first adapter part 28x constituting the support shaft 28a, the rotation restricting protrusion 28b, and the guide member connecting portion 28c, and a second adapter part 28y constituting the positioning portion 28d. Therefore, the adapter 28 can be configured such that the second adapter part 28y can be removed as necessary, or the second adapter part 28y can be appropriately replaced according to the stator 120, etc.

[0071] The power transmission mechanism 30 transmits the operating force applied to the operating unit 20 to move the stator 120 only in one axial direction (forward direction) and restricts movement in the reverse direction. The power transmission mechanism 30 can be configured with various power transmission mechanisms such as a one-way clutch, but in this embodiment, it is configured with a ratchet mechanism. As shown in FIG. 1 etc., the power transmission mechanism 30 includes a power transmission member 32 and an engagement unit 34.

[0072] As shown in FIG. 1 and other figures, the power transmission member 32 is a member disposed so as to extend along the axial direction of the stator 120. The power transmission member 32 may be rod-shaped, plate-shaped, or the like, but in this embodiment, it is plate-shaped. The power transmission member 32 functions as a one-way power transmission member that transmits power in one direction but does not transmit power in the reverse direction. In this embodiment, as shown in FIG. 1 and FIG. 8, the power transmission member 32 is a ratchet plate having a plurality of teeth 32a (ratchet teeth) arranged in the extension direction. The teeth 32a have one acute end (hereinafter also referred to as the "point") and the other end (hereinafter also referred to as the "slope") that is gently inclined relative to the point.

[0073] The power transmission member 32 has an operation unit connecting portion 32b. The operation unit connecting portion 32b is configured by a hole into which the power transmission member connecting portion 24b can be inserted. The power transmission member 32 is connected to the operation unit 20 at one end in the longitudinal direction so as to be capable of transmitting power by inserting the power transmission member connecting portion 24b into the hole forming the operation unit connecting portion 32b. The power transmission member 32 is provided at one end in the longitudinal direction and at the end on the other side. Therefore, the power transmission member 32 can change the direction of the teeth 32a depending on which of the operation unit connecting portions 32b, 32b provided on one side and the other side in the longitudinal direction the power transmission member connecting portion 24b is inserted into. That is, the power transmission member 32 can be attached so that the teeth 32a face downward and the pointed end faces the casing 112 by inserting the power transmission member connecting portion 24b into one of the operation unit connecting portions 32b, 32b. In addition, the power transmission member 32 can be attached so that the teeth 32a face downward and the pointed end faces away from the casing 112 by inserting the power transmission member connecting portion 24b into the other of the operation unit connecting portions 32b, 32b.

[0074] The power transmission member 32 is held by the first component 24 of the operation unit 20. In this embodiment, the power transmission member 32 is disposed between a plate-shaped portion constituting the first component 24 and an adapter 28 to which the first component 24 is connected. This allows the power transmission member 32 to be held by the first component 24 so as not to fall out of the stator movement region T.

[0075] As shown in FIG. 1 and other figures, the engagement portion 34 is a protrusion that can be engaged with and disengaged from the teeth 32a (ratchet teeth) provided on the power transmission member 32. That is, the engagement portion 34 functions as a pawl that fits into the teeth 32a (ratchet teeth) provided on the power transmission member 32. The engagement portion 34 can be provided integrally with the stator 120, but in this embodiment, it is provided on a first stator clamp 36 attached to the stator 120. The first stator clamp 36 is attached at a position that is offset toward one end side in the axial direction (the side connected to the casing 112) from the center of gravity of the stator 120. The first stator clamp 36 is attached so as to surround the outer periphery of the stator 120. The first stator clamp 36 can be attached to the stator 120 so as to be immovable relative to the stator 120 in the axial direction. The engagement portion 34 is provided in the first stator clamp 36 so as to protrude outward in a direction (radial direction) intersecting the axial direction of the stator 120 on one radial side and the other radial side of the stator 120 when the first stator clamp 36 is attached to the stator 120.

[0076] The power transmission mechanism 30 has teeth 32a (ratchet teeth) having a sharp tip on one side and a slope on the other side. Therefore, the power transmission mechanism 30 has a configuration in which the engagement portion 34 can be firmly engaged with the teeth 32a when the power transmission member 32 moves in a first direction (hereinafter referred to as the "forward direction"), but when the power transmission member 32 moves in the opposite direction (hereinafter referred to as the "reverse direction"), the engagement portion 34 slides down along the slope of the teeth 32a and moves to the next tooth 32a. Since the power transmission mechanism 30 is provided with such a ratchet mechanism, it is possible to effectively transmit the force transmitted from the operation unit 20 to the power transmission member 32 in only one direction and suppress the transmission of the force in the opposite direction. Furthermore, since the power transmission mechanism 30 is configured in this way, the stator 120 can be moved in a desired direction by adjusting the mounting direction of the power transmission member 32.

[0077] The stator guide portion 50 supports the stator 120 and guides it to slide in the axial direction when performing an assembly or removal operation of the stator 120. The stator guide portion 50 includes the positioning portions 28d, 28d provided on the adapter 28 described above, and can slide the stator 120 in the axial direction with high positioning accuracy. In addition, as shown in FIG. 1 etc., the stator guide portion 50 includes a guide member 52, a base portion 54, and a protrusion portion 56.

[0078] The guide member 52 is a member for supporting the stator 120 in the stator movement region T so as to be movable in the axial direction. The guide member 52 may have an appropriate shape such as a rail shape or a rod shape, but in this embodiment, the guide member 52 is plate-shaped. The guide member 52 is a member disposed on the side of the stator movement region T so as to extend along the axial direction of the stator 120. In this embodiment, the guide members 52, 52 are erected in pairs on one side and the other side of the stator movement region T.

[0079] As shown in FIG. 1, FIG. 9, etc., the guide member 52 has an assembly side end region 52a (tapered portion) at an end portion on the side (casing 112 side) in the assembly direction of the stator 120 in the installed state of the stator handling device 10. The assembly side end region 52a of the guide member 52 is formed so as to taper toward the end portion in the assembly direction of the stator 120. The assembly side end region 52a can have a tapered shape, a one-sided tapered shape, or the like, but in this embodiment, it has a one-sided tapered shape. In addition, the guide member 52 has a connection portion 52b for connecting to the adapter 28 at an end portion on the assembly side end region 52a side. The connection portion 52b is a rod-shaped protrusion, and the guide member 52 can be connected to the adapter 28 by inserting it into the guide member connection portion 28c provided on the adapter 28.

[0080] The assembly-side end region 52a is formed so that the portion that becomes the upper side when the stator handling device 10 is installed has a downward slope as it approaches the casing 112. Furthermore, the assembly-side end region 52a is located at a portion where the engagement portion 34 attached to the stator 120 arrives when the stator 120 is assembled. As a result, when the stator 120 is placed at the assembly position, the load that the guide member 52 receives from the stator 120 in the assembly-side end region 52a is smaller than the load that the guide member 52 receives from the stator 120 at a portion outside the assembly-side end region 52a.

[0081] The base portion 54 functions as a base that supports the guide members 52, 52 from below. By providing the base portion 54, the guide members 52, 52 can be installed at an optimal height so that the stator 120, which moves while being guided by the guide members 52, 52, is not positioned significantly away from the mounting position relative to the casing 112.

[0082] The base portion 54 is disposed at a longitudinal intermediate portion of the guide members 52, 52. The base portion 54 is fixed to the base B on which the uniaxial eccentric screw pump 110 is disposed by utilizing a fastener 112e (a nut in this embodiment) used for fixing the end stud 112a of the uniaxial eccentric screw pump 110 to the base B at its base portion 112f.

[0083] The protruding portion 56 is provided on the stator 120 so as to protrude outward in a direction intersecting the axial direction (in the present embodiment, the radial direction). The protruding portion 56 is provided at a position that is a predetermined support position 120b on the stator 120. The support position 120b can be set at an appropriate position in consideration of weight balance and the like, but in the present embodiment, the support position 120b is determined at a middle portion of the axial direction of the stator 120 with the center of gravity of the stator 120 as a reference. In the present embodiment, the support position 120b is determined at a position that is shifted in the removal direction (direction away from the casing 112) from the center of gravity of the stator 120. The support position 120b is also determined to be a position that is rearward (removal direction side) of the above-mentioned engagement portion 34 in the assembly direction of the stator 120.

[0084] Although the protrusion 56 can be provided integrally with the stator 120, in this embodiment, the protrusion 56 is provided on a second stator clamp 58 attached to the stator 120. The second stator clamp 58 is attached so as to surround the outer periphery of the stator 120. The second stator clamp 58 can be attached to the stator 120 so as to be immovable relative to the stator 120 in the axial direction. The protrusion 56 is provided on the second stator clamp 58 so as to protrude outward in a direction intersecting the axial direction of the stator 120 (radial direction) on one and the other radial sides of the stator 120 when attached to the stator 120.

[0085] The stator guide section 50 can move the stator 120 along the guide members 52, 52 by placing the engagement section 34 and the protrusions 56 provided on the stator 120 on a pair of guide members 52, 52 arranged opposite to each other. The guide members 52, 52 are arranged along the axial direction of the stator 120 on one side and the other side of the stator movement region T. The guide members 52, 52 are installed in a state where their heights are adjusted by the pedestal section 54. Therefore, the stator guide section 50 can smoothly move the stator 120 in the axial direction of the stator 120 while maintaining the stator 120 in a substantially horizontal position.

[0086] <About the installation and removal of the stator 120> Next, a description will be given of the assembling and disassembling operations of the stator 120 using the above-mentioned stator handling device 10. The assembling operation of the stator 120 using the stator handling device 10 can be performed in accordance with the procedures shown in (a) to (i) of FIG.

[0087] Specifically, when assembling the stator 120 using the stator handling device 10, first, the adapters 28, 28 are attached to the ends of the casing 112 of the uniaxial eccentric screw pump 110, as shown in Fig. 10(a). Then, as shown in Fig. 10(b), the tip portions of the guide members 52, 52 are inserted into the guide member connecting portions 28c, 28c to connect them. In addition, the base portion 54 that supports the guide members 52, 52 is fixed to the base B using the fixing tool 112e used to fix the end stud 112a.

[0088] 10(c), the stator 120, to which the first stator clamp 36 and the second stator clamp 58 have been attached in advance, is placed on the guide members 52, 52. This places the stator 120 in a state in which the engagement portion 34 provided on the first stator clamp 36 and the protrusion portion 56 provided on the second stator clamp 58 are placed on the upper end surfaces of the guide members 52, 52.

[0089] When the stator 120 is placed on the guide members 52, 52 as described above, the first parts 24, 24 and the power transmission members 32, 32 constituting the operation unit 20 are attached as shown in Fig. 10(d). That is, the operation unit connecting portion 32b provided on the power transmission member 32 is connected to the power transmission member connecting portion 24b of the first part 24, and the spindle 28a of the adapter 28 previously attached to the casing 112 is inserted into the spindle connecting portion 24a of the first part 24. In addition, the engagement portion 34 provided on the stator 120 is engaged with one of the teeth 32a provided on the power transmission member 32. In this manner, the first parts 24, 24 and the power transmission members 32, 32 are attached.

[0090] When the attachment of the first components 24, 24 and the power transmission members 32, 32 is completed as described above, the second component connecting portions 24d, 24d of the first components 24, 24 arranged to rise upward are inserted into the first component connecting portions 26a, 26a of the second component 26. This connects the first components 24, 24 and the second component 26 as shown in Fig. 10(e). This completes the setting of the stator handling device 10.

[0091] When the setting of the stator handling device 10 is completed as described above, the operating unit 20 is rotated around the fulcrum 22 as shown in Fig. 10(f). In response to this, the power transmission members 32, 32 move in the axial direction (extension direction) of the stator 120, and the multiple teeth 32a, 32a sequentially engage and disengage with the engagement parts 34, 34, respectively, and the engagement positions between the engagement parts 34, 34 and the teeth 32a, 32a change in the extension direction. As a result, the stator 120 moves in the axial direction toward the casing 112.

[0092] As described above, when the stator 120 moves to the casing 112 and the connection between the stator 120 and the casing 112 is completed, the first part 24 and the second part 26 constituting the operation unit 20 are removed as shown in FIG. 10(g). Thereafter, the fixing tool 112e that fixed the base part 54 is removed, and the guide members 52, 52 are removed from the guide member connecting parts 28c, 28c as shown in FIG. 10(h), and the base part 54 is removed from the base B. Also, the adapter 28 attached to the end of the casing 112 is removed as shown in FIG. 10(i). This completes the assembly work of the stator 120.

[0093] The removal of the stator 120 by the stator handling device 10 can be performed in a similar manner to the above-described assembly operation. Specifically, when removing the stator 120 using the stator handling device 10, the adapters 28, 28 are attached to the end of the casing 112 as shown in FIG. 11(a). Then, as shown in FIG. 11(b), the tip portions of the guide members 52, 52 are inserted into the guide member connecting portions 28c, 28c to connect them. At this time, the guide members 52, 52 are inserted from the underside of the stator 120. As a result, the engagement portion 34 and the protrusion 56 provided on the stator 120 are placed on the guide members 52, 52, and the stator 120 is supported by the guide members 52, 52. The base portion 54 is fixed to the base B by utilizing the fixing device 112e.

[0094] When the installation of the guide members 52, 52 is completed as described above, the first parts 24, 24 and the power transmission members 32, 32 constituting the operating unit 20 are attached as shown in Fig. 11(c). The method of attaching the first parts 24, 24 and the power transmission members 32, 32 is the same as that of the above-mentioned assembling work of the stator 120, but the attachment direction of the power transmission members 32, 32 is reversed. That is, when assembling the stator 120, the power transmission members 32, 32 are attached so that the direction approaching the casing 112 is the forward direction of the stator 120. On the other hand, when removing the stator 120, the power transmission members 32, 32 are attached so that the direction away from the casing 112 is the forward direction of the stator 120.

[0095] When the first components 24, 24 and the power transmission members 32, 32 are attached as described above, the second component 26 is connected to the first components 24, 24 as shown in Figure 11(d). This completes the setting of the stator handling device 10.

[0096] When the setting of the stator handling device 10 is completed as described above, the operating unit 20 is rotated around the fulcrum 22 as shown in FIG. 11(e). In response to this, the stator 120 moves in a direction away from the casing 112 along the axial direction. When the stator 120 moves to a position sufficiently away from the casing 112 in this manner, the first part 24 and the second part 26 constituting the operating unit 20 are removed as shown in FIG. 11(f). Thereafter, the fixture 112e that fixed the base part 54 is removed, and the guide members 52, 52 are removed from the guide member connecting parts 28c, 28c provided on the adapter 28 as shown in FIG. 11(g), and the base part 54 is removed from the base B. Also, the adapter 28 attached to the end of the casing 112 is removed as shown in FIG. 11(h). This completes the removal operation of the stator 120.

[0097] The uniaxial eccentric screw pump system S and the stator handling device 10 exemplified in the above-mentioned embodiment have the following characteristic configurations (a) to (m). As a result, the uniaxial eccentric screw pump system S and the stator handling device 10 can achieve the following unique effects.

[0098] (a) The above-described stator handling device 10 is for performing at least one of an assembly operation and a removal operation of the stator 120 in the uniaxial eccentric screw pump 110 by moving the stator 120 in the axial direction, and includes an operating unit 20 that can be rotated around a fixed fulcrum 22, a power transmission member 32 that is arranged to extend along the axial direction of the stator 120 and has a plurality of teeth 32a provided in the extension direction along the axial direction, and an engaging unit 34 that can engage with and disengage from the plurality of teeth 32a of the power transmission member 32. The operating unit 20 is connected to one of the power transmission member 32 and the stator 120, and an engaging portion 34 is provided on the other of the power transmission member 32 and the stator 120. When the engaging portion 34 is engaged with some of the multiple teeth 32a provided on the power transmission member 32, as the operating unit 20 is rotated, the multiple teeth 32a engage with and disengage from the engaging portion 34 in sequence, and the engagement position between the engaging portion 34 and the teeth 32a varies in the extension direction, thereby moving the stator 120 in the axial direction.

[0099] The above-mentioned stator handling device 10 is configured as described above in (a), so that a large force generated by the principle of leverage in response to the rotation of the operating unit 20 is transmitted to the stator 120 via the power transmission member 32 and the engaging portion 34. As a result, the above-mentioned stator handling device 10 can smoothly move the stator 120 in the axial direction. In addition, in the above-mentioned stator handling device 10, the multiple teeth 32a are engaged and disengaged with the engaging portion 34 in sequence in response to the rotation of the operating unit 20, and the engagement position between the engaging portion 34 and the teeth varies in the extension direction. Therefore, the above-mentioned stator handling device 10 can continue to move the stator 120 in the axial direction by repeating the rotation of the operating unit 20. Therefore, the above-mentioned stator handling device 10 can be utilized in at least one of the assembling operation and the disassembly operation of the stator 120 in the uniaxial eccentric screw pump 110, thereby reducing the labor required for the operation.

[0100] (b) In the above-mentioned stator handling device 10, the power transmission member 32 is connected to the operating unit 20, and the engagement portion 34 is fixed to the stator 120. As the operating unit 20 is rotated, the power transmission member 32 moves in the extension direction and the multiple teeth 32a sequentially engage and disengage with the engagement portion 34, and the engagement position between the engagement portion 34 and the teeth changes in the extension direction.

[0101] The above-mentioned stator handling device 10, by being configured as described above in (b), can move the stator 120 in the axial direction by utilizing a force applied to the operating unit 20 via the power transmission member 32 connected to the operating unit 20 and the engagement unit 34 fixed to the stator 120. Therefore, by utilizing the above-mentioned stator handling device 10 in at least one of the assembling operation and the removing operation of the stator 120, the labor required for the operation can be reduced.

[0102] (c) The above-mentioned stator handling device 10 is a uniaxial eccentric screw pump 110 equipped with a drive source 155 and a casing 112 attached between the stator 120 and the drive source 155, and the fulcrum 22 is provided on the casing 112 or an adapter 28 attached to the casing 112 (the above embodiment illustrates a configuration in which the fulcrum is provided on the adapter 28).

[0103] It is assumed that the above-mentioned stator handling device 10 applies a force to the stator 120, and thereby a large reaction force acts on the position of the fulcrum 22 of the operation unit 20. Based on this assumption, the above-mentioned stator handling device 10 is configured as described above in (c). By configuring the stator handling device 10 in this manner, it is possible to firmly fix the operation unit 20 at the position of the fulcrum 22 by utilizing the casing 112 or the adapter 28 attached to the casing 112, without separately providing a robust fixing member or the like for supporting the fulcrum 22.

[0104] (d) The above-described stator handling device 10 further includes guide members 52 extending along the axial direction of the stator 120, and the guide members 52 support the stator 120 so as to be movable in the axial direction.

[0105] The above-described stator handling device 10, by being configured as described in (d) above, can support the stator 120, which is a heavy object, so as to move smoothly along the axial direction.

[0106] (e) In the above-described stator handling device 10, the stator 120 is supported by the guide member 52 at the support position 120b which is the middle part of the stator 120 in the axial direction and which is defined with reference to the position of the center of gravity of the stator 120.

[0107] The above-described stator handling device 10, by being configured as described above in (e), can support the stator 120 movably in the axial direction while preventing the stator 120 from tilting in the vertical direction.

[0108] (f) The above-described stator handling device 10 is fixed to the stator 120 so that the engagement portion 34 protrudes in a direction intersecting the axial direction at a position offset from the support position 120b in the axial direction of the stator 120.

[0109] In the above-described stator handling device 10, by providing the engaging portion 34 at a position axially away from the support position 120b as in (f) above, it becomes unnecessary to extend the power transmission member 32 or to extend the length of the first stator clamp 36 while keeping the length of the power transmission member 32 unchanged. This allows the stator handling device 10 to minimize the size and weight of the components, reduce manufacturing costs, and improve ease of handling.

[0110] (g) In the above-described stator handling device 10, a protrusion 56 that protrudes in a direction intersecting the axial direction is provided on the stator 120 at support position 120b, and the protrusion 56 is arranged so as to contact the guide member 52, whereby the stator 120 is supported by the guide member 52 while its rotation around the axis is restricted.

[0111] By being configured as described above in (g), the stator handling device 10 can support the stator 120 so as to be movable in the axial direction while preventing the stator 120 from tilting vertically and preventing the stator 120 from rotating around the axis.

[0112] (h) In the above-described stator handling device 10, the uniaxial eccentric screw pump 110 is provided with an end stud 112a attached to one end side of the stator 120, and the end stud 112a is fixed to a base B supporting the uniaxial eccentric screw pump 110 by a fixing device 112e. When assembling and removing the stator 120, the fixing device 112e can be used to fix the guide member 52 to the base B.

[0113] By configuring the above-described stator handling device 10 as described in (h) above, the fasteners 112e for fixing the end studs 112a can be utilized when fixing the guide member 52 to the base B. This allows the above-described stator handling device 10 to have a simplified device configuration.

[0114] (i) In the above-described stator handling device 10, the guide member 52 has an assembly-side end region 52a at the end in the assembly direction of the stator 120, and when the stator 120 is assembled, the load received by the guide member 52 in the assembly-side end region 52a due to supporting the stator 120 is smaller than the load received by the guide member 52 in a portion outside the assembly-side end region 52a.

[0115] By configuring the above-mentioned stator handling device 10 as described above in (i), it becomes easier to remove the guide member 52 after the assembly work of the stator 120 is completed, and to install the guide member 52 when the stator 120 is removed.

[0116] (j) In the above-described stator handling device 10, the assembly-side end region 52a is formed so as to taper toward the end in the assembly direction of the stator 120.

[0117] By configuring the above-described stator handling device 10 as described in (j) above, it becomes easier to remove the guide member 52 after assembling the stator 120, and to install the guide member 52 when removing the stator 120.

[0118] (k) The above-described stator handling device 10 further includes a positioning unit 28d capable of positioning the stator 120 in a transverse cross section of the stator 120.

[0119] The above-described stator handling device 10, by being configured as described in (k) above, facilitates positioning of the stator 120. This makes it possible to suppress damage, deformation, wear, and the like of the stator 120 and surrounding members caused by performing an assembly operation or a removal operation of the stator 120 without sufficient positioning of the stator 120.

[0120] (l) The above-mentioned stator handling device 10 has an operating unit 20 which includes a first part 24 connected to the fulcrum 22 and a second part 26 which is attached directly or indirectly (directly in the above embodiment) to the first part 24 and can be grasped during rotation operation, and the power transmission member 32 is held by the first part 24, and the first part 24 is held by the second part 26.

[0121] The above-described stator handling device 10 holds the power transmission member 32 by the first component 24 constituting the operation unit 20 as described above in (l), thereby suppressing rattling and falling off of the power transmission member 32. Furthermore, the above-described stator handling device 10 is configured to hold the first component 24 by the second component 26 that is gripped during a rotation operation as described above in (l), thereby making it possible to stably hold the first component 24 during a rotation operation. Therefore, by being configured as described above in (l), the above-described stator handling device 10 can improve the operational stability of the power transmission member 32.

[0122] (m) The above-mentioned uniaxial eccentric screw pump system S comprises the uniaxial eccentric screw pump 110 and the above-mentioned stator handling device 10, and the uniaxial eccentric screw pump 110 has a rotor 130 formed by a male-threaded shaft, a stator 120 into which the rotor 130 can be inserted and whose inner surface is formed into a female-threaded type, and a flexible rod 172 which transmits power output from the drive source 155 to the rotor 130.

[0123] The stator handling device 10 included in the uniaxial eccentric screw pump system S can perform the assembly and removal of the stator 120 by moving the stator 120 in the axial direction without rotating the stator 120. Therefore, the above-mentioned uniaxial eccentric screw pump system S can prevent the flexible rod 172 from being unexpectedly twisted when the stator 120 is assembled and removed in the uniaxial eccentric screw pump 110 equipped with the flexible rod 172. Therefore, in the uniaxial eccentric screw pump system S, the stator 120 can be prevented from being unexpectedly rotated when the stator 120 is assembled and removed.

[0124] The uniaxial eccentric screw pump system S and the stator handling device 10 illustrated in the above embodiment are merely examples of the present invention, and the configurations can be modified without departing from the spirit of the present invention. Below, modified examples of the uniaxial eccentric screw pump system S and the stator handling device 10 will be described. In the description of the modified examples, the configurations common to the above-mentioned uniaxial eccentric screw pump system S and the stator handling device 10 will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0125] <<Variations>> As shown in FIG. 12, the stator handling device 10 according to the modification is different from that exemplified in the above embodiment in that an adapter 228 is adopted instead of the above-mentioned adapter 28. The adapter 228 has a substantially U-shaped or substantially C-shaped shape in front view. The adapter 228 can be attached by fitting from above to a flange-shaped portion provided at the end of the casing 112. By attaching the adapter 228 to the flange portion of the casing 112, a spigot structure is formed. The adapter 228 is provided so that the support shafts 28a, 28a protrude to one side and the other side when attached to the flange portion of the casing 112 and viewed from the front. The support shafts 28a, 28a are inserted into the support shaft connecting portions 24a, 24a of the first parts 24, 24 of the operating unit 20, so that the operating unit 20 can be connected to the support shafts 28a, 28a. Furthermore, on the front side of the adapter 228, guide member connection portions 28c, 28c are provided at positions adjacent to the casing 112 on the left and right.

[0126] The adapter 228 is provided with a starting bolt 230 on the top surface. The adapter 228 is provided with a jack bolt as the starting bolt 230. In this modification, two starting bolts 230, 230 are provided, which are provided at positions on one side and the other side (left side and right side) when the adapter 228 is attached to the flange portion of the casing 112 and viewed from the front. This allows the left and right mounting positions of the adapter 228 to be finely adjusted by adjusting the starting bolts 230, 230, respectively.

[0127] The adapter 228 of this modification can adjust the height of the guide member connection parts 28c, 28c by adjusting the pressing bolts 230, 230. This allows the position of the connection part 52b side of the guide members 52, 52 connected to the guide member connection part 28c to be changed in the vertical direction. Therefore, by adopting the adapter 228 instead of the adapters 28, 28, the guide member 52 can be easily attached and detached even without making the assembly side end region 52a of the guide member 52 tapered. In addition, when the adapter 228 is used, the height of the guide members 52, 52 can be easily adjusted by adjusting the pressing bolts 230, 230. Therefore, as shown in Figures 13(a) and (b), cut-out portions 52c, 52c and cut-out portions 54a, 54a that fit into the guide members 52, 52 and the base portion 54 are provided in a shape extending in the vertical direction, and by fitting the guide members 52, 52 and the base portion 54 at the cut-out portions 52c, 52c and the cut-out portions 54a, 54a, the base portion 54 can be easily connected to the guide members 52, 52 as shown in Figure 13(c).

[0128] Unlike the adapter 28 of the above embodiment, the adapter 228 of this modification does not include the positioning portion 28d. On the other hand, the adapter 228 includes the pressing bolts 230, 230, and the height of the guide members 52, 52 can be adjusted as described above. Therefore, by using the adapter 228, the height of the stator 120 supported by the guide members 52, 52 can also be adjusted. Therefore, by using the adapter 228 instead of the adapters 28, 28 as in this modification, the positioning of the stator 120 in the left-right direction must be performed visually by the user, but the positioning of the stator 120 in the up-down direction can be performed by adjusting the pressing bolts 230, 230.

[0129] Other Modifications The examples given in the above embodiment are merely examples of the present invention, and the configurations according to (a) to (m) above may be different from those given in the above embodiment without departing from the spirit of the present invention. Furthermore, the uniaxial eccentric screw pump system S and the stator handling device 10 of the present invention may be provided with other configurations in addition to or instead of the configurations given in (a) to (m) above, or may be configured with some of the configurations omitted.

[0130] Specifically, in the stator handling device 10 exemplified in the above embodiment, as shown in (b) above, the power transmission member 32 is connected to the operation unit 20, and the engagement portion 34 is fixed to the stator 120, but the present invention is not limited to this. For example, it is also possible for the power transmission member 32 to be connected to the stator 120 via the first stator clamp 36 or the like, and for the engagement portion 34 to be fixed to the operation unit 20, etc.

[0131] Specifically, as shown in FIG. 14, for example, the power transmission member 32 is connected to the first stator clamp 36 attached to the stator 120 in a manner that allows it to rotate (swing) at the operation unit connection portion 32b provided on the stator 120 side (shown by a black circle in the figure). Also, the first part 24 of the operation unit 20 is provided with an engagement portion 34 while being set so as to be able to rotate (swing) around the fulcrum 22 (shown by a black circle in the figure). In this configuration, the engagement portion 34 provided on the operation unit 20 is sequentially engaged with and disengaged from the teeth 32a of the power transmission member 32 with the rotation operation of the operation unit 20, and the engagement position between the engagement portion 34 and the teeth 32a is repeatedly changed in the extension direction. This allows the stator 120 to move in the axial direction in the same manner as exemplified in the above embodiment.

[0132] In the above embodiment, the second stator clamp 58 is provided with the protruding portion 56, which is attached so as to surround the stator 120. However, the present invention is not limited to this. For example, instead of the second stator clamp 58, a mounting fixture 158 as shown in FIG. 15(a) may be prepared, and a support portion 156 for supporting the mounting fixture 158 may be provided instead of the protruding portion 56. The mounting fixture 158 shown in FIG. 15(a) has a support portion 155 curved to a shape that follows a part of the outer circumferential surface of the stator 120, and support portions 156, 156. In the above embodiment, the stator 120 is circular, so the support portion 155 is arc-shaped (semicircular in the illustrated example). The support portions 156, 156 are formed so as to continue to one end side and the other end side of the support portion 155, respectively. The support portions 156, 156 are bent into a hook shape, and can support the stator 120 supported by the mounting fixture 158 and the support portion 155 by being hooked onto the guide members 52, 52.

[0133] When the stator 120 is arranged on the guide members 52, 52 using the mounting fixture 158, the support parts 156, 156 are hooked to the guide members 52, 52 arranged opposite to each other, and the mounting fixture 158 is attached to the guide members 52, 52, and then the stator 120 is arranged on the support parts 155. Alternatively, the support parts 155 are arranged along the outer circumferential surface of the stator 120 at a predetermined position of the stator 120 to set the mounting fixture 158 in a mounted state, and then the support parts 156, 156 are hooked to the guide members 52, 52 arranged opposite to each other. This allows the stator 120 to be arranged on the guide members 52, 52 together with the mounting fixture 158 and supported. In this way, the stator 120 can be arranged on the guide members 52, 52 using the mounting fixture 158, as shown in Figures 15(b) and (c).

[0134] The second stator clamp 58 can hold the stator 120 firmly and has a somewhat complicated shape with the protrusion 56, whereas the mounting fixture 158 described above has a simple configuration that supports the stator 120 from below and hooks onto the guide members 52, 52 to support it. Here, the stator 120 is supported by the rotor 130 in a state where the rotor 130 is inserted, and is unlikely to tilt unintentionally. Therefore, the stator handling device 10 only needs to be capable of supporting the stator 120 so as not to tilt unintentionally while the stator 120 and the rotor 130 are in a non-connected state. Therefore, as described above, even if a simple one such as the mounting fixture 158 is used, the stator handling device 10 can suppress the stator 120 from tilting unexpectedly, similar to the case where the second stator clamp 58 is used. In addition, by using a simple one such as the mounting fixture 158, the manufacturing cost of the stator handling device 10 can be suppressed and the device can be easily handled. The mounting fixture 158 may be attached to the guide member 52 only while the stator 120 and the rotor 130 are in a non-connected state, and may be removed from the guide member 52 when the stator 120 and the rotor 130 are in a connected state.

[0135] In the above-described stator handling device 10, as described in (c) above, the fulcrum 22 is provided on the casing 112 or the adapter 28, but the present invention is not limited to this. The stator handling device 10 can also be configured such that, for example, a fixing member or the like for supporting the fulcrum 22 is separately provided and the fulcrum 22 is provided on the fixing member.

[0136] The above-mentioned stator handling device 10 includes the guide member 52 extending along the axial direction of the stator 120 as in (d) above, but the present invention is not limited to this. For example, a configuration may be adopted in which the stator 120 is supported movably in the axial direction by separately providing a support member that supports the stator 120 from below.

[0137] In the above-described stator handling device 10, as described in (e) above, the stator 120 is supported by the guide member 52 at the support position 120b defined based on the center of gravity position, but the present invention is not limited to this. The stator handling device 10 can also support the stator 120 by defining the support position 120b based on another reference other than the center of gravity of the stator 120.

[0138] As described above in (f), the stator handling device 10 has the engagement portion 34 fixed to the stator 120 so as to protrude in a direction intersecting the axial direction at a position offset from the support position 120b in the axial direction of the stator 120, but the present invention is not limited to this, and it is also possible to have a configuration in which the engagement portion 34 is provided at the support position 120b.

[0139] The above-mentioned stator handling device 10 has been exemplified as having the protrusion 56 at the support position 120b as in (g) above, but the present invention is not limited to this. For example, the stator handling device 10 may be configured without the protrusion 56, or may be configured such that the engagement portion 34 is provided at the support position 120b so that the function of the protrusion 56 can be fulfilled by the engagement portion 34, rather than providing the protrusion 56 separately in addition to the engagement portion 34. That is, the stator handling device 10 can be configured as in (n) below.

[0140] (n) In the above-described stator handling device 10, the engagement portion 34 is preferably provided at the support position 120b and supports the stator 120.

[0141] By configuring the above-described stator handling device 10 as described in (n) above, the engaging portion 34 can be utilized as having the function of the protruding portion 56. This allows the above-described stator handling device 10 to have a simplified device configuration.

[0142] The above-mentioned stator handling device 10 is fixed to the base B using the fixture 112e for fixing the end stud 112a of the uniaxial eccentric screw pump 110 as described above in (h), but the present invention is not limited to this. The stator handling device 10 can be configured such that a fixture for fixing to the base B is separately prepared instead of using the fixture 112e, or a fixture other than the fixture 112e used in the uniaxial eccentric screw pump 110, such as a fixture used to attach the stay bolt 116, can be used for fixing to the base B.

[0143] As described above in (i), the stator handling device 10 is configured so that the load received by the guide member 52 in the assembly-side end region 52a in association with supporting the stator 120 is smaller than the load received by the guide member 52 in a portion outside the assembly-side end region 52a, but the present invention is not limited to this. The stator handling device 10 may receive a load from the stator 120 in the assembly-side end region 52a that is equal to that received in other portions.

[0144] The above-mentioned stator handling device 10 is formed so that the assembly-side end region 52a tapers toward the end in the assembly direction of the stator 120 as described above in (j), but the present invention is not limited to this. For example, as shown in Fig. 13, the stator handling device 10 may be formed so that the assembly-side end region 52a does not taper.

[0145] The stator handling device 10 according to the above embodiment is capable of positioning in the up, down, left and right directions by using the adapter 28 having the positioning unit 28d as described in (k) above. In addition, the stator handling device 10 can perform positioning in the up and down directions as described in (k) above even when the adapter 228 illustrated as a modified example is used. However, the present invention is not limited to this. For example, the stator handling device 10 can be configured to perform positioning of the stator 120 by a configuration different from the above-mentioned adapters 28, 228. In addition, the stator handling device 10 can be configured to have a positioning function for the stator 120 in the up, down, left and right directions, a positioning function for the left and right directions instead of having a positioning function for the up and down directions, or no positioning function for the stator 120.

[0146] The above-mentioned stator handling device 10 has been illustrated as an example of a configuration in which the power transmission member 32 is arranged on the inside (the stator moving area T side) of the first part 24 forming the operation part 20, so that the power transmission member 32 is held by the first part 24 forming the operation part 20, and the first part 24 is held by the second part 26 forming the operation part 20, as in (l) above. However, the present invention is not limited to this configuration. For example, the stator handling device 10 may be configured such that the power transmission member 32 is held by another configuration, not by the configuration as in (l) above. Specifically, the power transmission member connecting portion 24b provided on the first part 24 may be configured to protrude outward instead of protruding inward (the stator moving area T side), so that the first part 24 and the power transmission member 32 are connected in a state in which the power transmission member 32 is arranged on the outside of the first part 24. In such a configuration, it is preferable to provide a flange portion 24e on the power transmission member connecting portion 24b or to attach a separate retaining member to prevent the power transmission member 32 from falling off.

[0147] In the above-mentioned single-shaft eccentric screw pump system S, as described above in (m), the single-shaft eccentric screw pump 110 has a flexible rod 172 that transmits the power output from the drive source 155 to the rotor 130, but the present invention is not limited to this. For example, the single-shaft eccentric screw pump system S can be one in which the single-shaft eccentric screw pump 110 is provided with an Oldham joint, a pin joint, or the like as the connecting shaft 170.

[0148] The present invention is not limited to the configurations described in the above-mentioned embodiments, and appropriate design modifications and the like are possible within the scope of the technical idea of ​​the present invention. The components of the above-mentioned embodiments and modifications may be arbitrarily selected and combined. Any component of each embodiment or modification may be arbitrarily combined with any component described in the means for solving the problems, the mode for carrying out the invention, etc., or any component that embodies any component described in the means for solving the problems, the mode for carrying out the invention, etc. The present invention also intends to obtain rights to these in this application or a divisional application based on this application, etc. [Industrial Applicability]

[0149] The stator handling device and single-shaft eccentric screw pump system of the present invention can be suitably used in all single-shaft eccentric screw pumps that require stator assembly and removal operations, and in all single-shaft eccentric screw pump systems equipped with such pumps. [Explanation of symbols]

[0150] 10: Stator handling device 20:Operation unit 22:Fulcrum 24: First part 26:Second part 28: Adapter 28d: Positioning section 32: Power transmission parts 32a: Tooth 34: Engagement part 52: Guide member 52a: Assembly side end area 56:Protrusion 110: Single-shaft eccentric screw pump 110: Pump 112: Casing 112a: End stud 112d: Middle part 112e: Fixtures 120: Stator 120b: Support position 124: Inner surface 130: Rotor 155: Driving source 172: Flexible rod 228: Adapter B: Bass S: Single-axis eccentric screw pump system

Claims

1. A stator handling device for performing at least one of the following operations—assembly and disassembly—of a single-screw eccentric pump, by moving the stator in the axial direction, An operating unit that can be rotated starting from a fixed pivot point, A power transmission member is provided which is arranged to extend along the axial direction of the stator and which has a plurality of teeth in the extension direction along the axial direction, The power transmission member comprises an engaging portion that can engage with and disengage from a plurality of teeth, The power transmission member and the operating unit are capable of transmitting power to each other, such that the power transmission member moves in the extension direction in response to the operation of the operating unit, and the engaging portion is provided with respect to the stator. A stator handling device characterized in that, with the engaging portion engaged with a portion of the plurality of teeth provided on the power transmission member, the plurality of teeth sequentially engage with and disengage from the engaging portion in accordance with the rotational operation of the operating portion, and the engagement position between the engaging portion and the teeth changes in the extension direction, thereby moving the stator in the axial direction.

2. A stator handling device for performing at least one of the following operations: assembly and disassembly of a stator in a single-screw eccentric pump, by moving the stator in the axial direction. An operating unit that can be rotated starting from a fixed pivot point, A power transmission member is provided which is arranged to extend along the axial direction of the stator and which has a plurality of teeth in the extension direction along the axial direction, The power transmission member comprises an engaging portion that can engage with and disengage from a plurality of teeth, The power transmission member is capable of transmitting power to the stator, and the engagement portion is provided with respect to the operating portion. A stator handling device characterized in that, with the engaging portion engaged with a portion of the plurality of teeth provided on the power transmission member, the plurality of teeth sequentially engage with and disengage from the engaging portion in accordance with the rotational operation of the operating portion, and the engagement position between the engaging portion and the teeth changes in the extension direction, thereby moving the stator in the axial direction.

3. The power transmission member is connected to the operating unit in a manner that allows power to be transmitted to it. The engagement portion is fixed to the stator, The stator handling device according to claim 1, characterized in that, in response to the rotation of the operating unit, the power transmission member moves in the extension direction and the plurality of teeth sequentially engage with and disengage from the engaging portion, and the engagement position between the engaging portion and the teeth changes in the extension direction.

4. The aforementioned single-screw eccentric pump comprises a drive source and a casing mounted between the stator and the drive source. The stator handling device according to claim 1 or 2, characterized in that the pivot point is provided on the casing or an adapter mounted on the casing.

5. The stator handling device according to claim 1 or 2, characterized in that the pivot point is provided on a fixing member fixed to a base supporting the single-axis eccentric screw pump.

6. The stator further comprises a guide member extending along the axial direction of the stator, The stator handling device according to claim 1 or 2, characterized in that the guide member supports the stator so that it can move in the axial direction.

7. The stator is further supported by a support member, The stator handling device according to claim 1 or 2, characterized in that the support member supports the stator so that it can move in the axial direction as the stator moves in the axial direction.

8. The stator handling device according to claim 6, characterized in that the stator is supported by the guide member at a support position defined with respect to the center of gravity of the stator, which is in the axial direction of the stator.

9. The stator handling device according to claim 8, characterized in that the engaging portion is fixed to the stator at a position offset from the support position in the axial direction of the stator, and protrudes in a direction intersecting the axial direction.

10. A projection is provided on the stator that protrudes in a direction intersecting the axial direction, The stator handling device according to claim 1, characterized in that the stator is supported by a base that supports the single-axis eccentric screw pump, or a member fixed to the base, while the rotation of the stator in the direction of the axis is restricted by the protrusion.

11. A protruding portion that extends in a direction intersecting the axial direction is provided on the stator at an intermediate portion in the axial direction of the stator, at a support position defined with respect to the center of gravity of the stator. The stator handling device according to claim 6, characterized in that the protruding portion is arranged to contact the guide member, so that the stator is supported by the guide member while its rotation around the axis is restricted.

12. The stator handling device according to claim 8, characterized in that the engaging portion is provided at the support position and supports the stator.

13. The aforementioned single-screw eccentric pump includes an end stud attached to one end of the stator, The end stud is fixed to the base supporting the uniaxial eccentric screw pump by a fastener, The stator handling device according to claim 6, characterized in that the fixing device can be used to fix the guide member to the base during the assembly and removal of the stator.

14. The guide member has an assembly-side end region at the end of the stator in the assembly direction, The stator handling device according to claim 6, characterized in that, when the stator is assembled, the load received by the guide member in the assembly-side end region due to the support of the stator is smaller than the load received by the guide member in the portion outside the assembly-side end region.

15. The stator handling device according to claim 14, characterized in that the assembly-side end region is formed to taper towards the end of the stator in the assembly direction.

16. The stator handling device according to claim 1 or 2, further comprising a positioning portion capable of positioning the stator in a cross-section of the stator.

17. The aforementioned operating unit A first component connected to the aforementioned pivot point, The system comprises a second part which is directly or indirectly attached to the first part and which can be gripped during the rotational operation, The power transmission member is held by the first component, The stator handling device according to claim 1 or 2, characterized in that the first component is held by the second component.

18. A single-screw eccentric pump and A stator handling device according to claim 1 or 2, Equipped with, The aforementioned single-screw eccentric pump, A rotor composed of a male screw-shaped shaft, A stator through which the rotor can be inserted, and whose inner circumferential surface is formed in the shape of an internal screw, A flexible rod that transmits power output from the drive source to the rotor, A single-screw eccentric pump system characterized by having the following features.

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